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Tytuł:
noty o autorach
Autorzy:
n/n, n/n
Powiązania:
https://bibliotekanauki.pl/articles/669926.pdf
Data publikacji:
2017
Wydawca:
Polskie Towarzystwo Ludoznawcze
Źródło:
Zbiór Wiadomości do Antropologii Muzealnej; 2017, 4
2391-6869
Pojawia się w:
Zbiór Wiadomości do Antropologii Muzealnej
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
lista recenzentów
Autorzy:
n/n, n/n
Powiązania:
https://bibliotekanauki.pl/articles/669851.pdf
Data publikacji:
2017
Wydawca:
Polskie Towarzystwo Ludoznawcze
Źródło:
Zbiór Wiadomości do Antropologii Muzealnej; 2017, 4
2391-6869
Pojawia się w:
Zbiór Wiadomości do Antropologii Muzealnej
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Spis treści
Autorzy:
n., n.
Powiązania:
https://bibliotekanauki.pl/articles/7402579.pdf
Data publikacji:
2023-07-27
Wydawca:
Wojskowe Biuro Historyczne
Źródło:
Przegląd Historyczno-Wojskowy; 2023, XXIV (LXXV), 1(283); 1-7
1640-6281
Pojawia się w:
Przegląd Historyczno-Wojskowy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Terapija trikhinelleza steroidnymi gormonami i ejo oslozhnenija
Hormonoterapia włośnicy i powikłania przy tej metodzie leczenia
Hormonotherapy of trichinellosis and the complications in this method of treatment
Autorzy:
Plotnikov, N.N.
Ozereckovskaja, N.N.
Powiązania:
https://bibliotekanauki.pl/articles/838132.pdf
Data publikacji:
1960
Wydawca:
Polskie Towarzystwo Parazytologiczne
Źródło:
Annals of Parasitology; 1960, 06, 4
0043-5163
Pojawia się w:
Annals of Parasitology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Terapija trikhinelleza steroidnymi gormonami i ejo oslozhnenija
Hormonoterapia włośnicy i powikłania przy tej metodzie leczenia
Hormonotherapy of trichinellosis and the complications in this method of treatment
Autorzy:
Plotnikov, N.N.
Ozereckovskaja, N.N.
Powiązania:
https://bibliotekanauki.pl/articles/2180162.pdf
Data publikacji:
1960
Wydawca:
Polskie Towarzystwo Parazytologiczne
Źródło:
Wiadomości Parazytologiczne; 1960, 06, 4; 342-344
0043-5163
Pojawia się w:
Wiadomości Parazytologiczne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
O patogeneze visceralnykh porazhenijj pri trikhinelleze
Patogeneza zmian w narządach wewnętrznych w przebiegu włośnicy
Changes in the internal organs in the course of trichinellosis
Autorzy:
Ozereckovskaja, N.N.
Powiązania:
https://bibliotekanauki.pl/articles/838247.pdf
Data publikacji:
1960
Wydawca:
Polskie Towarzystwo Parazytologiczne
Źródło:
Annals of Parasitology; 1960, 06, 4
0043-5163
Pojawia się w:
Annals of Parasitology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fortifikacionnye sooruzenia Brestskogo rajona kak ob''ekty turizma
Tourist infrastructure through the prism of vivid water
Autorzy:
Vlasuk, N. N.
Powiązania:
https://bibliotekanauki.pl/articles/398637.pdf
Data publikacji:
2009
Wydawca:
Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:
Brześć
fortyfikacje
obiekt turystyczny
Brest region
fortifications
tourist object
Opis:
Forts XIX-XX c. in region Brest (Belarus) have historical and cultural value, cultural and tourist potential. Now this is forts destruction and use ineffective. The revitalization of historic forts including: principles of restoration and adaptation to cultural and tourist use, the suggestions about architectural and town-planning organization of the cultural and tourist objects (the determination of composition, capacity and location of services, the organization of transport and pedestrian movement and tourists’ routes, the rehabilitation and renovation of green plantations), the suggestions about the composition and contents of design work have been worked out. The methods used in the research are as follows: genetic analysis, graphical and analytical analysis, SWOT-analysis, correlation analysis, observation. Preconditions of modern use fortifications constructions in tourism system on an example of the architectural project revitalization fortification constructions in area Kozlovichi in Brest are developed.
Źródło:
Architecturae et Artibus; 2009, 1, 2; 87-95
2080-9638
Pojawia się w:
Architecturae et Artibus
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Response of Ixodes persulcatus P. Sch. population to DDT and its residues
Reakcja populacji Ixodes persulcatus P. Sch. na DDT i jego pozostałości śladowe
Reakcija populjacii Ixodes persulcatus P. Sch. na DDT i ego ostatki
Autorzy:
Gorchakovskaya, N.N.
Powiązania:
https://bibliotekanauki.pl/articles/2154264.pdf
Data publikacji:
1977
Wydawca:
Polskie Towarzystwo Parazytologiczne
Źródło:
Wiadomości Parazytologiczne; 1977, 23, 1-3; 251-252
0043-5163
Pojawia się w:
Wiadomości Parazytologiczne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
O patogeneze visceralnykh porazhenijj pri trikhinelleze
Patogeneza zmian w narządach wewnętrznych w przebiegu włośnicy
Changes in the internal organs in the course of trichinellosis
Autorzy:
Ozereckovskaja, N.N.
Powiązania:
https://bibliotekanauki.pl/articles/2180158.pdf
Data publikacji:
1960
Wydawca:
Polskie Towarzystwo Parazytologiczne
Źródło:
Wiadomości Parazytologiczne; 1960, 06, 4; 323-325
0043-5163
Pojawia się w:
Wiadomości Parazytologiczne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Prawo autorskie w kartografii w Rosji
Copyright on cartographic works in the Russian Federation
Autorzy:
Komedchikov, N. N.
Powiązania:
https://bibliotekanauki.pl/articles/341221.pdf
Data publikacji:
2007
Wydawca:
Uniwersytet Przyrodniczy we Wrocławiu
Tematy:
prawo autorskie
dzieło kartograficzne
kartografia rosyjska
copyright law
cartographic work
Russian cartography
Opis:
Artykuł omawia zagadnienia związane z prawem autorskim w Rosji, a szczególnie koncentruje się na prawie autorskim w kartografii. Podano prawa, ustawy i artykuły dotyczące praw autorskich w ogólności oraz szczegółowo omówiono te, które dotyczą dzieł kartograficznych. W artykule zamieszczone są fragmenty instrukcji, zasad, reguł i regulacji prawnych dotyczących prawa autorskiego odnoszącego się do dzieł kartograficznych.
Abstract. The paper presents problems connected with copyright in Russia, especially in cartographic works. There are described Laws and Articles related to copyright in general and to copyright in cartographic works in detail. Some instructions, rules, legal and law regulating copyright in relation to cartographic works are described in the paper.
Źródło:
Acta Scientiarum Polonorum. Geodesia et Descriptio Terrarum; 2007, 6, 3; 15-18
1644-0668
Pojawia się w:
Acta Scientiarum Polonorum. Geodesia et Descriptio Terrarum
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
What’s Love Got to Do with It?
Co miłość ma z tym wspólnego?
Autorzy:
Trakakis, N.N.
Powiązania:
https://bibliotekanauki.pl/articles/488545.pdf
Data publikacji:
2015
Wydawca:
Katolicki Uniwersytet Lubelski Jana Pawła II. Towarzystwo Naukowe KUL
Tematy:
miłość romantyczna
małżeństwo
J.K. Campbell
Bizancjum
romantic love
marriage
Byzantium
Opis:
W artykule polemizuję ze stanowiącym osnowę publikacji Alexandra Prussa One Body zasadniczym założeniem, że małżeństwo jest ściśle związane z miłością, w tym z miłością romantyczną. To założenie, jak argumentuję, wypływa po części z wyraźnie współczesnego rozumienia małżeństwa. Pokazuję, że w tym względzie stanowisko Prussa kłóci się z poglądem na małżeństwo i praktyką małżeńską z czasów przednowoczesnych, w szczególności z ujęciem chrześcijańskim okresu Cesarstwa Bizantyńskiego, gdy małżeństwo nie opierało się na miłości (romantycznej). Wreszcie podaję pewne przykłady, które pokazują, dlaczego w średniowiecznej kulturze chrześcijańskiej romantyczna miłość nie była związana z instytucją małżeństwa.
This paper contests an important assumption guiding Alexander Pruss’ One Body, that marriage is intimately connected with love, including romantic love. This assumption, I argue, is the product in part of a distinctively modern understanding of marriage. To show this, Pruss’ position is set against the premodern, and in particular the Byzantine Christian, view and practice of marriage, where marriage was not grounded to any significant extent on (romantic) love. Finally, some indication is provided as to why romantic love was disassociated from marriage in medieval Christian culture.
Źródło:
Roczniki Filozoficzne; 2015, 63, 3; 43-54
0035-7685
Pojawia się w:
Roczniki Filozoficzne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Kartografia atlasowa w Rosji w latach 2002-2006
Publishing of atlases in Russia in 2002-2006
Autorzy:
Komedchikov, N. N.
Khropov, A.
Powiązania:
https://bibliotekanauki.pl/articles/341223.pdf
Data publikacji:
2007
Wydawca:
Uniwersytet Przyrodniczy we Wrocławiu
Tematy:
kartografia rosyjska
atlas geograficzny
rynek kartograficzny
Rosja
Russian cartography
geographical atlas
cartographic market
Russia
Opis:
W ostatnich 5 latach w Rosji opublikowano ponad 100 różnych atlasów geograficznych. W artykule podano przyczyny tak wielkiego boomu wydawniczego – przytoczono fakty, tematy, zamierzenia i nowe trendy w kartografii atlasowej. Przedstawiono również kilkanaście przykładów atlasów ogólnogeograficznych, atlasów tematycznych i branżowych, podano ich ocenę jakościową i opisano uznanie zdobyte na forach krajowych i międzynarodowych.
More than 100 titles of various geographical atlases were issued in Russia during the last five years. The article explains what is the reason of this extraordinary boom of atlas mapping in Russia. There are given some factors, themes, purposes and new phenomenon responsible for this development. Some kinds of complex geographical atlases, thematic (branch) atlases, public and governmental estimation of Russian atlases are described in the article.
Źródło:
Acta Scientiarum Polonorum. Geodesia et Descriptio Terrarum; 2007, 6, 3; 19-25
1644-0668
Pojawia się w:
Acta Scientiarum Polonorum. Geodesia et Descriptio Terrarum
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Generalized hyperbolic processes autocovariance functions
Autorzy:
Troush, N. N.
Kuzmina, A.
Powiązania:
https://bibliotekanauki.pl/articles/92840.pdf
Data publikacji:
2014
Wydawca:
Uniwersytet Przyrodniczo-Humanistyczny w Siedlcach
Tematy:
generalized hyperbolic process
normal inverse Gaussian process
variance gamma process
autocovariation function
Opis:
Generalized hyperbolic processes are Levy processes which allow an almost perfect fit to financial data. Autocovariance functions of generalized hyperbolic processes such as the normal inverse Gaussian process, the variance gamma process and the hyperbolic process are deduced at this paper.
Źródło:
Studia Informatica : systems and information technology; 2014, 1-2(18); 37-45
1731-2264
Pojawia się w:
Studia Informatica : systems and information technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Space-time characteristics of mesoscale structures in the North- East Gdańsk Bay
Autorzy:
Golenko, N. N.
Paka, W. T.
Powiązania:
https://bibliotekanauki.pl/articles/1920505.pdf
Data publikacji:
1999
Wydawca:
Instytut Morski w Gdańsku
Tematy:
mesoscale structure
North-East Gdańsk Bay
Opis:
Temporal and spatial variability of mesoscale structures in the North-East Gdańsk Bay is discussed. During measurements in September 1997, variability in the upper layer was determined by convective cooling processes. Measurements made in January 1998 show that between the two periods renewal of a whole halocline water took place in the Gdańsk Bay.
Źródło:
Biuletyn Instytutu Morskiego w Gdańsku; 1999, 26, 1; 47-55
1230-7424
2450-5536
Pojawia się w:
Biuletyn Instytutu Morskiego w Gdańsku
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
O vlijanii benzimidazolov na kletochno-vospalitel'nuju reakciju khozjaina pri ehksperimental'nom trikhinellezeru
O wpływie benzimidazolów na zapalne nacieki komórkowe żywiciela w przebiegu eksperymentalnej trichinellozy
The influence of Benzimidazoles on hosts cellular inflammatory infiltrations in the course of experimental trichinellosis
Autorzy:
Pereverzeva, E.V.
Ozereckovskaja, N.N.
Powiązania:
https://bibliotekanauki.pl/articles/2154079.pdf
Data publikacji:
1979
Wydawca:
Polskie Towarzystwo Parazytologiczne
Źródło:
Wiadomości Parazytologiczne; 1979, 25, 5; 559-566
0043-5163
Pojawia się w:
Wiadomości Parazytologiczne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Stress-strainstate of the flexible element with composite unremovable formwork
Stan naprężenia-odkształcenia elementu elastycznego z nieusuwalnym szalunkiem kompozytowym
Autorzy:
Shalobyta, N. N.
Shalobyta, T. P.
Powiązania:
https://bibliotekanauki.pl/articles/111095.pdf
Data publikacji:
2019
Wydawca:
Centrum Rzeczoznawstwa Budowlanego Sp. z o.o.
Tematy:
stress-strain state
flexible element with composite unremovable formwor
monolithic constructions
slab elements
void-former
moment
deflection
stan naprężenie-odkształcenie
element elastyczny z nieusuwalnym szalunkiem kompozytowym
konstrukcje monolityczne
elementy stropowe
ugięcie
Opis:
The article deals with the work under load of a bent reinforced concrete girder element with a fixed formwork made of cement-bonded particleboard reinforced with. The main strength and deformation parameters of a multi component structure are determined, the main pre-purpose of which is to use overlap for monolithic structures with the inclusion of non-removable formwork of cement-bonded wood board in collaboration.
Artykuł dotyczy pracy wygiętego elementu dźwigara żelbetowego z szalunkiem stałym wykonanym z płyty cementowo-drzazgowej zbrojonej pod obciążeniem. W ramach badań określono główne parametry wytrzymałościowe i deformacyjne konstrukcji wieloskładnikowej, której głównym celem wstępnym jest zastosowanie zakładki dla konstrukcji monolitycznych z włączeniem we współpracy nieusuwalnego szalunku z płyt cementowo-drewnianych.
Źródło:
Inżynieria Bezpieczeństwa Obiektów Antropogenicznych; 2019, 3
2450-1859
2450-8721
Pojawia się w:
Inżynieria Bezpieczeństwa Obiektów Antropogenicznych
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Option pricing by Esscher transforms in the cases of normal inverse Gaussian and variance gamma processes
Autorzy:
Troush, N. N.
Kuzmina, A. V.
Powiązania:
https://bibliotekanauki.pl/articles/92926.pdf
Data publikacji:
2012
Wydawca:
Uniwersytet Przyrodniczo-Humanistyczny w Siedlcach
Tematy:
Esscher transforms
option pricing
generalized hyperbolic process
normal inverse Gaussian process
variance gamma process
Opis:
The class of Esscher transforms is an important tool for option pricing Gerber and Shiu (1994) showed that the Esscher transform is an efficient technique for valuing derivative securities if the log returns of the underlying securities are governed by certain stochastic processes with stationary and independent increments. Levy processes are the processes of such type. Special cases of the Levy processes such as the normal inverse Gaussian process and the variance gamma process are considered at this paper. Values of these processes parameters for the existence of Esscher transform are deduced. A new algorithm of a normal inverse Gaussian process and variance gamma process simulation is also presented in this paper. These algorithm is universal and simpler one compared with analogous algorithms.
Źródło:
Studia Informatica : systems and information technology; 2012, 1-2(16); 35-43
1731-2264
Pojawia się w:
Studia Informatica : systems and information technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Tworzenie holdingów – stan istniejących i perspektywy rozwoju
Holdings setting up – present situation and development perspectives
Autorzy:
Efimenko, A.G.
Korotin, N.N.
Powiązania:
https://bibliotekanauki.pl/articles/798677.pdf
Data publikacji:
2002
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Opis:
The aim of research was a definition of present situation in the field of holding setting up and their development perspectives. In Mogilev region in Belarus holdings setting up was done in some stages. 112 companiens connected with agricultural processing and agricultural services were transformed (93,3% of the total). The introduced transformation program and company administrative structure improvement will improve management effectiveness in companies set up during the privatization period.
Celem badań było określenie aktualnej sytuacji w zakresie tworzenia holdingów i ustalenie perspektyw ich rozwoju. Badaniami objęto Okręg Mogilewski na Białorusi, gdzie tworzenie holdingów realizowane było etapami. Zreformowano 112 przedsiębiorstw zajmujących się przetwórstwem i obsługą rolnictwa, co stanowi 93,3% ogółu. Przyjęty program reform i doskonalenia struktury organizacyjnej przedsiębiorstw zwiększy efektywność zarządzania spółkami powstałymi w okresie prywatyzacji.
Źródło:
Zeszyty Problemowe Postępów Nauk Rolniczych; 2002, 486, 2
0084-5477
Pojawia się w:
Zeszyty Problemowe Postępów Nauk Rolniczych
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Biological Regularities of restoration of Ixodes persulcatus P. Sch. tick populations after eradication measures
Prawidłowości biologiczne w procesie odtwarzania się populacji kleszcza Ixodes persulcatus P. Sch. po akcji zwalczania
Biologicheskie zakonomernosti v processe vosstanovlenija populjacii kleshha Ixodes persulcatus P. Sch. posle akcii borby
Autorzy:
Korotkov, Y.S.
Gorchakovskaya, N.N.
Powiązania:
https://bibliotekanauki.pl/articles/2154228.pdf
Data publikacji:
1977
Wydawca:
Polskie Towarzystwo Parazytologiczne
Źródło:
Wiadomości Parazytologiczne; 1977, 23, 1-3; 255-256
0043-5163
Pojawia się w:
Wiadomości Parazytologiczne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Residues of DDT in biogeocenoses of taiga after application of DDT for control of Ixodes Persulcatus P. Sch.
Pozostałości DDT w biogeocenozach tajgi po zastosowaniu DDT do zwalczania kleszcza Ixodes Persulcatus P. Sch.
Ostatki DDT v biogeocenozakh tajjgi posle primenenija DDT dlja borby s kleshhim Ixodes Persulcatus P. Sch.
Autorzy:
Konstantinov, O.K.
Gorchakovskaya, N.N.
Powiązania:
https://bibliotekanauki.pl/articles/2154262.pdf
Data publikacji:
1977
Wydawca:
Polskie Towarzystwo Parazytologiczne
Źródło:
Wiadomości Parazytologiczne; 1977, 23, 1-3; 253-254
0043-5163
Pojawia się w:
Wiadomości Parazytologiczne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On fractional random differential equations with delay
Autorzy:
Vu, H.
Phung, N. N.
Phuong, N.
Powiązania:
https://bibliotekanauki.pl/articles/254723.pdf
Data publikacji:
2016
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
sample path fractional integral
sample path fractional derivative
fractional differential equations
sample fractional random differential equations
Caputo fractional derivative
delay
Opis:
In this paper, we consider the existence and uniqueness of solutions of the fractional random differential equations with delay. Moreover, some kind of boundedness of the solution is proven. Finally, the applicability of the theoretical results is illustrated with some real world examples.
Źródło:
Opuscula Mathematica; 2016, 36, 4; 541-556
1232-9274
2300-6919
Pojawia się w:
Opuscula Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Chronology of Formation of Solar Radio Burst Types III and V Associated with Solar Flare Phenomenon on 19th September 2011
Autorzy:
Hamidi, Z. S.
Shariff, N. N. M.
Powiązania:
https://bibliotekanauki.pl/articles/411656.pdf
Data publikacji:
2014
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
solar radio burst
solar flare
type III
type V
CALLISTO
Opis:
The formation of two different solar bursts, type III and V in one solar flare event is presented. Both bursts are found on 19th September 2011 associated with C-class flares on active region 1295. From the observation, we believed that the mechanism of evolution the bursts play an important role in the event. It is found that type V burst appeared in five minutes after type III. There are a few active regions on the solar disk but most are magnetically simple and have remained rather quiet. An interpretation of this new result depends critically on the number of sunspots and the role of active region 1295. Sunspot number is increased up to 144 with seven sunspots can be observed. During that event, the speed of solar wind exceeds 433.8 km/second with 2.0 g/cm3 density of protons in the solar corona. Currently, radio flux is also high up to 150 SFU. The solar flare type C6 is continuously being observed in the X-ray region for 24 hours since 1541 UT and a maximum C1 is detected on 1847 UT. Although the sources of both bursts are same, the direction and ejection explode differ.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2014, 5; 32-42
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation of Radio Frequency Interference (RFI) Profile and Determination of Potential Astronomical Radio Sources
Autorzy:
Hamidi, Z. S.
Shariff, N. N. M.
Powiązania:
https://bibliotekanauki.pl/articles/411988.pdf
Data publikacji:
2014
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Radio Frequency Interference (RFI)
radio astronomy
RFI sources
Opis:
In this article, we have recognized a Radio Frequency Interference (RFI) sources that can potentially affect for radio astronomical observation. The main objective of this surveying is to test and qualify the potential of radio astronomical sources that can be observed in Malaysia generally. Analysis process focuses on the high sources that contribute the pollution and the significant region that can be considered for astronomical purpose beginning 1-2000 MHz. It was found that 13 individual sources contribute as a noise and mostly are telecommunication and radio navigation applications. We then compared of the RFI profiles based on three different periods in order to observe the variety of the signals. The main regions that still excellent to do an observation are: 13.36 -13.41 MHz (solar), (25.55-25.67) MHz (Jupiter) and (37.50-38.25) MHz (Continuum) respectively. This work is also an initiative of the International Space Weather Initiative (ISWI) project where Malaysia is one of the countries that involve in e-CALLISTO (Compound Astronomical Low Cost Low Frequency Transportable Observatory) network project. Some suggestions are recommended in order to improve the quality of the radio frequency profile.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2014, 5; 43-49
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Detailed Investigation of a Moving Solar Burst Type IV Radio Emission in on Broadband Frequency
Autorzy:
Hamidi, Z. S.
Shariff, N. N. M.
Powiązania:
https://bibliotekanauki.pl/articles/412146.pdf
Data publikacji:
2014
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Solar radio emission
solar burst type IV
e-CALLISTO
solar flare
Active Region 1429
Opis:
The moving type IV burst component of the solar radio region from 260-380 MHz observed using the CALLISTO spectrometer is discussed in detail. We used the Compound Astronomical Low Cost Low Frequency Spectrometer Transportable Observatory (CALLISTO) system connected to the Log Periodic Dipole Antenna (LPDA) at the National Space Centre, Selangor located (3.0833333°N 101.5333333°E) on 22nd February 2012. It is found that a strong burst that caused by extraordinary solar flares are due to magnetic reconnection effect potentially induced in the near-Earth magneto tail. From our observation the indication of signal potentially drives Coronal Mass Ejections (CMEs). We also compare our results with the Geostationary Operational Environmental Satellites (GOES) data. From our analysis, one possible reason behind the formation of this very complex long duration of this loop is the magnetic reconnection and disruption of the loops which is observed during flare maximum. The Active Region, AR 1429 active region was a site of several intense in several days. From the results, it showed that the burst is formed from the explosion of M-class solar flare which can be observed at 412UT. As a conclusion, a good agreement was reached and we believe that Sun’s activities are more active to pursuit the solar maximum cycle.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2014, 7; 30-36
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Determination of Flux Density of the Solar Radio Burst Event by Using Log Periodic Dipole Antenna (LPDA)
Autorzy:
Hamidi, Z. S.
Shariff, N. N. M.
Powiązania:
https://bibliotekanauki.pl/articles/412450.pdf
Data publikacji:
2014
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
sun
CALLISTO
Log Periodic Dipole Antenna (LPDA)
power flux density
solar radio burst
Opis:
In this article, an evaluation of the flux density of the solar radio burst is presented. A rod aluminium’s type as a conductor with nineteenth (19) elements of different sizes is being prepared to construct a log periodic dipole antenna (LPDA) from 45-870 MHz. The performance was carried out at the National Space Agency (PAN), Sg. Lang, Banting Selangor by connecting to the Compound Low Cost Low Frequency Spectroscopy Transportable Observatory (CALLISTO) spectrometer. The input impedance, R0 = 50 ohm is chosen for this LPDA antenna. From the analysis, the gain of the antenna is 9.3 dB. This antenna potentially captures a signal that covers about 0.08 m2 area of the Sun.The temperature of the burst that detected at the feedpoint of the antenna is 32 K. However, the signal becomes decrease to 28.75 K while by CALLISTO spectrometer as a receiver. It was also found that the isotropic source spectral power is 1576 W/Hz. Since the burst level above the background sky is 0.41 dB , the flux density of the burst is 5.5 x 10-21 W/m2/Hz. Based on the results, we conclude that this antenna is suitable for to observe the Sun activities at low frequency region.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2014, 7; 21-29
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Enormous Eruption of 2.2 X-class Solar Flares on 10th June 2014
Autorzy:
Hamidi, Z. S.
Shariff, N. N. M.
Powiązania:
https://bibliotekanauki.pl/articles/411754.pdf
Data publikacji:
2014
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
sun
X-ray region
solar flare
active region
Opis:
The observational of active region emission of the Sun contain an critical answer of the time-dependence of the underlying heating mechanism. In this case, we investigate an X2.2 solar flare from a new Active Region AR2087 on the southeast limb of the Sun. The solar flare peaked in the X-rays is around 11:42 UT. It was found that the snapshot of this event from the Solar Dynamics Observatory (SDO) channel with the GOES X-ray plot overlayed. The flare is very bright causes by a diffraction pattern. We explore a parameter space of heating and coronal loop properties. Based on the wavelength, it shows plasma around 6 million Kelvin. At the same time, data from the NOAA issued an R3 level radio blackout, which is centered on Earth where the Sun is currently overhead at the North Africa region. This temporary blackout is caused by the heating of the upper atmosphere from the flare. The blackout level is now at an R1 and this will soon pass. Other than the temporary radio blackout for high frequencies centered over Africa this event will not have a direct impact on us. Until now, we await more data concerning a possible Coronal Mass Ejections (CMEs) but anything would more than likely not head directly towards Earth. An active region AR2087 just let out an X1.5 flare peaking at 12:52 UT. This shows plasmas with temperatures up to about 10 Million Kelvin. This event is considered one of the massive eruption of the Sun this year.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2014, 17, 3; 249-257
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Nonlinear Behavior of the Radio Frequency Interference (RFI) Sources at Faculty of Applied Sciences, MARA University of Technology
Autorzy:
Hamidi, Z. S.
Shariff, N. N. M.
Powiązania:
https://bibliotekanauki.pl/articles/412047.pdf
Data publikacji:
2014
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Radio Frequency Interference (RFI)
RFI sources
solar radio burst
CALLISTO
Opis:
In this article, we describe and compare several sources of the nonlinear of Radio Frequency Interference (RFI) based on classification methods. It is very important to characterize and understand the nature of interference in as much of the candidate spectrum as possible. Preliminary analysis has been done in 2011. As data sizes of observations grow with new and improved solar monitoring system, the need for completely automated, robust methods for RFI mitigation is highlighted. The current status of RFI noise level is being compared at two different sites (i) indoor and (ii) outdoor. The main objective is to evaluate and find the best range of low frequency in MHz for the solar monitoring purpose. Our findings are consistent with those of previous studies. There is not much different in terms of the sources of RFI. However, the level of RFI is become increase. Based on the results, it was found that the distribution of RFI sources in indoor site is in the range from -(80-105) dBm. A strong and moderate RFI can be identified in the range of -100 dBm. The dominant sources in this region are due to the fixed mobile signal with 10 points of this signal from 1-2000 MHz. If we compare with outdoor site, the distribution of RFI sources in indoor site is in the range from -(75-105) dBm. It means that the signal of noise is larger compared with indoor site. While new sources strive to remain the increasing of RFI signal levels, numerous factors interact to influence the pattern of this noise. Reporting to the authoritative body should be made to make sure the allocation of the solar monitoring frequency region was not used by other applications. This work is a current scenario of the nonlinear RFI level at our site.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2014, 15; 39-47
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Propagation of An Impulsive Coronal Mass Ejections (CMEs) due to the High Solar Flares and Moreton Waves
Autorzy:
Hamidi, Z. S.
Shariff, N. N. M.
Powiązania:
https://bibliotekanauki.pl/articles/412288.pdf
Data publikacji:
2014
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
sun
solar eclipse
solar radio
burst
type III
e-CALLISTO
Opis:
This paper provides a short review of some of the basic concepts related to the origin of Coronal Mass Ejections (CMEs). The numerous ideas which have been put forward to elucidate the initiation of CMEs are categorized in terms of whether this event is a gradual CME or impulsive CME. In this case, an earth-directed Coronal Mass Ejection (CME) was observed on April 2, 2014 by the Large Angle Spectrometric Coronagraph (LASCO) C2. This recent observations obtained a large impulsive CMEs. The CME, originating from the active region AR2027. The speed of CMEs is 1600 kms-1. A halo CME, a bright expanding ring at the North-West region is exploded beginning at about 14:36 UT, and the process of departing, expansion and propagation are highlighted. We discuss the correspondence of this event with the structure of the CME in the LASCO data. It is believed that the high solar flare and a Moreton waves initiate this kind of CMEs.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2014, 14, 1; 118-126
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Mechanism of Signal Processing of Solar Radio Burst Data in E-CALLISTO Network (Malaysia)
Autorzy:
Hamidi, Z. S.
Shariff, N. N. M.
Powiązania:
https://bibliotekanauki.pl/articles/412533.pdf
Data publikacji:
2014
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Space weather
CALLSITO system
ISWI (International Space Weather Initiative)
sun
solar radio burst
solar activity
signal processing
e-network
Opis:
Solar space weather events like Coronal Mass Ejections and solar flares are usually accompanied by solar radio bursts, which can be used for a low-cost real-time space weather monitoring. In order to make a standard system, a CALLISTO (Compound Astronomical Low-cost Low-frequency Instrument for Spectroscopy in Transportable Observatory) spectrometers, designed and built by electronics engineer Christian Monstein of the Institute for Astronomy of the Swiss Federal Institute of Technology Zurich (ETH Zurich) have been already developed all over the world since 2005 to monitor the solar activities such as solar flare and Coronal Mass Ejections (CMEs). Up to date, there are 25 sites that used the same system in order to monitor the Sun within 24 hours. This outstanding project also is a part of the United Nations together with NASA initiated the International Heliophysical Year IHY2007 to support developing countries participating in ‘Western Science’. Beginning February 2012, Malaysia has also participated in this project. The goals of this work is to highlight how does the signal processing of solar radio burst data transfer from a site of National Space Centre Banting Selangor directly to the Institute of Astrophysics Switzerland. Solar activities in the low region, focusing from 150 MHz to 400 MHz is observed daily beginning from 00.30UT 12.30 UT. Here, we highlighted how does the signal processing work in order to make sure that the operation is in the best condition. Although the solar activities have experienced rapid growth recently, high-level management of CALLISTO system has remained successfully manage the storage of data. It is also not easy to maintain the future data seems the number of sites are also growing from time to time. In this work, we highlighted the potential role of Malaysia as one of the candidate site that possible gives a good data and focusing on a few aspects such as optimization, and performance evaluation data and visualization.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2014, 15; 30-38
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Observations of Different Type of Bursts Associated with M 6.3 Solar Flares
Autorzy:
Hamidi, Z. S.
Shariff, N. N. M.
Powiązania:
https://bibliotekanauki.pl/articles/412558.pdf
Data publikacji:
2014
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
sun
low frequency
solar radio
burst
type III
type U
e-CALLISTO
Opis:
Variation of solar bursts due to solar flares such as type an isolated type III , a complex type III, U is being highlighted. These bursts occurred on 9th March 2012 at the National Space Centre, Sg. Lang, Selangor, Malaysia Here, we study a unique case with a combination of two types burst associated with solar flare and CMEs. Our observation is focused on the low frequency region starting from 150 MHz till 400 MHz. We found that a solar flare type solar flare type M 6.3 which occurred in active region AR 1429 starting from 3:32 UT and ending at 05:00 UT. The flare has been confirmed to be the largest flare since 2005. Some physical parameters will be measured. We then compared our results with X-ray data from NOAA Space Weather Prediction Centre (SWPC).
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2014, 4; 29-36
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Cryogenic sources of irradiation
Kriogeniczne źródła napromieniowania
Autorzy:
Agapov, N.N.
Sosnowski, J.
Mitrofanova, Y.A.
Powiązania:
https://bibliotekanauki.pl/articles/160120.pdf
Data publikacji:
2012
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Elektrotechniki
Tematy:
promieniowanie
radioterapia
akcelerator
nadprzewodnictwo
irradiation
radiotherapy
accelerator
superconductivity
Opis:
In the paper are described cryogenic sources of irradiation, basing on the case of large accelerator system of the Nuclotron, built in JINR in Dubna, Russia. In this device beams of light ions, protons and of heavy ions are accelerated, while their collisions with appropriate targets allow for investigation various nuclear reactions, improving in this way our basic knowledge. On the other side ions irradiation is more and more useful now in medical applications, In therapy of the oncology diseases, especially at anti-cancer therapy. This topic is considered in the paper in more details basing on future, perspective program of using Nuclotron at this aim.
Przedstawiono kriogeniczne żródła napromieniowania, w oparciu o układ nadprzewodnikowego akceleratora jonów Nuklotronu, zbudowanego w ZIBJ w Dubnie, w Rosji. Akcelerator ten umożliwia napromieniowanie jonami i jest używany generalnie do badań reakcji jądrowych. Z drugiej strony, naświetlanie jonami, w projekcie gantry, odgrywać może coraz większą rolę w onkologii przy leczeniu nowotworów, np. w przypadku zbyt głębokiego dla terapii laserowej położenia nowotworu lub bliskości innych organów.
Źródło:
Prace Instytutu Elektrotechniki; 2012, 256; 369-377
0032-6216
Pojawia się w:
Prace Instytutu Elektrotechniki
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Side lobes reducing by variation of array apperture edge shape
Autorzy:
Gorobets, N.N.
Gorobets, Yu.N.
Kiyko, V.I.
Powiązania:
https://bibliotekanauki.pl/articles/308797.pdf
Data publikacji:
2000
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
phone antenna arrays
side lobes level reducing
Opis:
A possibility of side lobes level reducing in plane antenna array by creation of aperture comb edge in arrays with rectangular and circular aperture shape together with usage of different types of reducing to the array edges amplitude distributions is investigated by computer analysis. It is shown that usage of the comb structure in combination with the reducing amplitude distribution enables one to reach the side lobes level reducing in the array to -27 ÷ -29 dB.
Źródło:
Journal of Telecommunications and Information Technology; 2000, 1-2; 85-89
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Reakcija belojj krovi u myshejj, zarazhennykh razlichnymi shtammami trikhinell
Obraz białych krwinek u myszy zarażonych różnymi szczepami T. spiralis
The picture of white blood corpuscles in mice infected with different T. spiralis strains
Autorzy:
Pereverzeva, E.V.
Ozereckovskaja, N.N.
Veretennikova, N.L.
Powiązania:
https://bibliotekanauki.pl/articles/2176286.pdf
Data publikacji:
1974
Wydawca:
Polskie Towarzystwo Parazytologiczne
Źródło:
Wiadomości Parazytologiczne; 1974, 20, 1; 59-65
0043-5163
Pojawia się w:
Wiadomości Parazytologiczne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Hyaluronic acid suppresses age related skin changes
Autorzy:
Larkina, S. A.
Oleynik, N. N.
Vastyanov, R. S.
Powiązania:
https://bibliotekanauki.pl/articles/765461.pdf
Data publikacji:
2017
Wydawca:
Uniwersytet Mikołaja Kopernika w Toruniu. Wydział Nauk o Ziemi i Gospodarki Przestrzennej. Katedra Kultury Fizycznej
Tematy:
hyaluronic acid, skin, papillary layer, mesh layer, connective tissue, collagen, age-dependent changes
Opis:
Functioning of the skin with age leads to its changes under which the condition of the dermis fibers deteriorates, which affects the appearance of the person and causes a number of consecutive pathological processes in the skin deeper layers. The development of methods for the prevention and treatment of age-related involuntary changes in the skin, enhancement of repair processes in its various layers is relevant and has a scientific and practical significance. Morphological studies of rabbits skin after the exogenous hyaluronic acid (HA) administration in various concentrations were performed. Studies have shown that when HA various concentrations are injected intradermally into rabbits, the increase in the formation of connective tissue fibers in the dermis is manifested with an increase of HA concentration. An increase in the HA concentration in the compounds promotes an increase in the degree of compaction of the dermis of rabbits. Lower HA concentration (1.4% and 2%) after single administration causes stimulation of the processes inside the skin at earlier time (2 weeks), and a concentration of 4% - is more active at a later time (8 weeks). We can assume a connection between the HA concentration and the time of the manifestation of the most pronounced morphological changes in the skin. It is likely that the stimulating effect of HA is manifested when the optimal physiological concentration is reached. The obtained data are in favor of further studies of the influence of the concentration of exogenous HA on the processes of skin biorevitalization.
Źródło:
Journal of Education, Health and Sport; 2017, 7, 4
2391-8306
Pojawia się w:
Journal of Education, Health and Sport
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Economical reactive powder concrete cast using available materials in North Sinai, Egypt
Autorzy:
Meleka, N. N.
Bashandy, A. A.
Arab, M. A.
Powiązania:
https://bibliotekanauki.pl/articles/231066.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
proszek reaktywny
beton
właściwości mechaniczne
zawartość
cement
pył krzemionkowy
włókno stalowe
reactive powder
concrete
mechanical properties
silica fume
steel fiber
Opis:
In this research reactive powder concrete (RPC) was prepared using sand from North Sinai. The mechanical properties of locally cast RPC were investigated and evaluated by studying the effects of using different cement and silica fume contents and new steel fibers’ aspect ratios as reinforcement for RPC. Specimens’ preparation, curing regimes and testing procedures to evaluate the compressive strength, the modulus of elasticity, the indirect tensile strength and the flexural strength were discussed. A compressive strength of 154.5MPa, indirect tensile strength of 11.98MPa, modulus of elasticity of 45.1GPa and flexural strength of 30.26MPa have been achieved for reinforced RPC contains 800 kg/m3 cement content and silica fume content 30% of cement weight. The test results showed some improvements by increasing cement and silica fume contentsas well as adding steel fibers on the compressive strength, modulus of elasticity and indirect tensile strength.
Źródło:
Archives of Civil Engineering; 2013, 59, 2; 175-195
1230-2945
Pojawia się w:
Archives of Civil Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
First Light Detection of A Single Solar Radio Burst Type III Due To Solar Flare Event
Autorzy:
Hamidi, Z. S.
Shariff, N. N. M.
Monstein, C.
Powiązania:
https://bibliotekanauki.pl/articles/411677.pdf
Data publikacji:
2014
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Solar flare
low frequency
radio wavelength
solar burst
type III
CALLISTO
Opis:
The eruption mechanism of solar flares and type III are currently an extremely active area of research, especially during the solar cycle is towards maximum. In this case, the total energy of solar burst type III is of the order of solar flare with the explosion of the energy can up to 1015 ergs. The solar flare event is one of the most spectacular explosions that still be on-going study in the solar physics world. This event occurred at 2:000 UT on 15th April 2012 is due to the explosion of the magnetic energy in from the chromosphere and converted into the heating, mass motion and particle acceleration which can be detected by solar radio burst type III. In this work, we will highlight our first light detection of very tiny solar radio burst type III, which has been observed at the National Space Centre, Banting, Selangor detected by the Compound Low Cost Low Frequency Transportable Observatories (CALLISTO) system at 5:53:23. The region of the data is from 150 − 400 MHz in radio region. This burst is drifted from 150 MHz till 260 MHz. It represents a total energy of 6.2035 × 10-7 eV − 1.0753 × 10-6 eV. This fast drift burst is a continuity of the acceleration of the particles which is intermittent, and can be observed since the explosion of the solar flare. Although the burst is very tiny, it is still significant because this burst is the first detection of a single type III burst from our site. Still, the acceleration of the particles can be detected from Earth in the radio region within 3 hours period of observation at the post stage of solar flare.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2014, 11, 1; 51-58
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Scenario of Solar Radio Burst Type III During Solar Eclipse on 14th November 2012
Autorzy:
Hamidi, Z. S.
Shariff, N. N. M.
Monstein, C.
Powiązania:
https://bibliotekanauki.pl/articles/411752.pdf
Data publikacji:
2014
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
sun
solar eclipse
solar radio
burst
type III
e-CALLISTO
Opis:
A compact solar flare was observed during a total solar eclipse event on 13-14 November 2012. This phenomenon is beginning in local time on November 14 west of the date line over northern Australia, and ended in local time on November 13 east of the date line near the west coast of South America. During the eclipse, the highest magnitude was 1.0500, occurring only 12 hours before perigee, with the maximum eclipse totality lasting just over four minutes. Considering the observational facts, the solar radio burst type III can be detected from the National Space Centre Malaysia by the Compound Low Cost Low Frequency Transportable Observatory (CALLISTO) system from 00:00 UT –1:30 UT. The group and individual solar burst type III can be detected in the region of 150-400 MHz. However, the eclipse cannot be observed from our site. From the observation, it was found that the eruption in the active region is becoming more active with a tens of groups solar radio burst type III can be observed. It continuing bursting within the first one hour. The sunspot number exceeds to 108 and solar wind speed 454.9 km/sec. Still the Sun remains active and we need to consider other processes to explain in detailed the injection, energy loss and the mechanism of the acceleration of the particles.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2014, 13, 2; 135-143
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Different Between the Temperature of the Solar Burst at the Feed Point of the Log Periodic Dipole Antenna (LPDA) and the CALLISTO Spectrometer
Autorzy:
Hamidi, Z. S.
Shariff, N. N. M.
Monstein, C.
Powiązania:
https://bibliotekanauki.pl/articles/411932.pdf
Data publikacji:
2014
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
CALLISTO
Log Periodic Dipole Antenna
LPDA
temperature
solar radio burst
Opis:
The article attempts to analyze and compare the temperature of solar radio burst at the (i) feed point and antenna and (ii) at the receiver (CALLISTO spectrometer). The analysis is very important to evaluate the performance for a better observation of solar radio burst. We start our project by developing this antenna with 19 elements of different sizes covers from 45 − 870 MHz. We choose the National Space Agency (PAN), Sg. Lang, Banting, Selangor, Malaysia as our site seems this site has a very minimum of Radio Frequency Interference (RFI). The antenna, then connects to the low noise amplifier and the CALLISTO spectrometer as one complete system. Based on the results, it was found that the temperature of the at the feed point of the antenna and receiver is different up to 3.25 K. The average level burst level above background sky is about 0.41dB. It was found that the power of solar burst at the feed point of the antenna is equivalent to 2.6 x 10-18 W, but decreases to 2.3 x 10-18 W when detected by the CALLISTO spectrometer. These results show a better understanding of how does the system operate in terms of the process of analysis of the temperature of solar radio burst.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2014, 11, 2; 167-176
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Occurrences Rate of Type II and III Solar Radio Bursts at Low Frequency Radio Region 45 − 870 MHz
Autorzy:
Hamidi, Z. S.
Shariff, N. N. M.
Monstein, C.
Powiązania:
https://bibliotekanauki.pl/articles/412187.pdf
Data publikacji:
2014
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
CALLISTO
low frequency
solar burst
type II
type III
solar flare
Coronal Mass Ejections
CMEs
Opis:
Observations of type II and III solar bursts indicate that while type III bursts may appear at any altitude, from the very low corona into interplanetary space, type II solar bursts do not act the same way. This work focuses on recent observations in the radio region on the low frequency region from 45 MHz to 870 MHz. Our analysis employed the accuracy of the daily solar burst measurements of e-CALLISTO network. It was found that solar burst type II explode quite minimum with 1-2 events from 2006 - 2010. However, the data 2011 for solar burst type II increases drastically with 16 events has been recorded. The occurrences of Coronal Mass Ejections (CMEs) events are also increasing up to four times in 2011. Most of the both events can be observed in the range of 150 MHz till 500 MHz. Overall, we can say that the range of photon energy for solar burst type III is between 7.737 x 10-7 eV to 1.569 x 10-6 eV. In the case of solar burst type II, the distribution of energy is much smaller with 1.596 x 10-6 eV to 6.906 x 10-6 eV. Detailed investigation of solar burst will concern the 2011 data seem to show a significant trend for both types. We showed that the increasing of both solar burst events via years implies directing an increasing of solar activities including sunspot number, solar flare and Coronal Mass Ejections (CMEs) events. It is expected that both types will increase gradually in the beginning of 2014.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2014, 18; 103-112
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An Observation of an Inverted Type U Solar Burst Due to AR1429 Active Region
Autorzy:
Hamidi, Z. S.
Shariff, N. N. M.
Monstein, C.
Powiązania:
https://bibliotekanauki.pl/articles/412209.pdf
Data publikacji:
2014
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
CALLISTO
low frequency
solar burst
type U
Radio Frequency Interference (RFI)
Opis:
A detailed investigation of an inverted type U solar burst in meter region and their associated the solar flare and Coronal Mass Ejections (CMEs) has been reported. Solar type U burst has been observed at the National Space Centre, Banting, Selangor detected by the Compound Low Cost Low Frequency Transportable Observatories (CALLISTO) system in the 150 MHz till 400 MHz at the low frequency band. An inverted U type is occurring on 9th March 2012 between 4:00 UT to 4:15 UT within 1 minute (4:12 − 4:13) UT. From the dynamic spectra of CALLISTO, we have identified metric type U burst with maximum emission near the frequency 385MHz. In specific, the continuum type III burst will soon structure this burst due to our observations. Other types such as type II and IV are only appearing only after type U burst is ejected and appear at the same point of the solar flare event. Since the U burst activity coincides with the peak of the hard X-ray flare at 4:12UT in AR1429, we classified that the event is associated with the injection of the high energetic particles. In conclusion, it is confirmed that an inverted type U burst is initiated after a complex and a group solar radio burst type III.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2014, 10; 81-90
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Characterization of Selected Solar Radio Bursts Based on Solar Activity Detected by e- CALLISTO (Malaysia)
Autorzy:
Hamidi, Z. S.
Shariff, N. N. M.
Monstein, C.
Powiązania:
https://bibliotekanauki.pl/articles/412630.pdf
Data publikacji:
2014
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
sun
low frequency
solar radio
burst
type II
type III
type IV
type V
type U
e-CALLISTO
Opis:
One of the main reasons to study more about the dynamics of solar radio bursts is because solar these bursts can interfere with the Global Positioning System (GPS) and communications systems. More importantly, these bursts are a key to understand the space weather condition. Recent work on the interpretation of the low frequency region of a main solar burst is discussed. Continuum radio bursts are often related to the solar activities such as an indication of the formation of sunspot, impulsive phase of solar flares and Coronal Mass Ejections (CMEs) and their frequencies correspond to the densities supposed to exist in the primary energy release volume. Specifically, solar burst in low frequency play an important role in interpretation of Sun activities. In this work, we have selected few solar bursts that successfully detected by our station at the National Space Centre, Banting Selangor. Our objective is to correlate the solar burst with Sun activities by looking at the main sources that responsibility with the trigger of solar burst. It is found that type II burst is dominant with Coronal Mass Ejections (CMEs), type III burst associated with solar flare, IV burst with the formation of active region and type U burst high solar flare. We believed that this work is a good start to monitor Sun’s activities in Malaysia as equatorial country.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2014, 13, 2; 144-159
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evaluation of Spectral Overview and Radio Frequency Interference (RFI) Sources at Four Different Sites in CALLISTO Network at the Narrow Band Solar Monitoring Region
Autorzy:
Hamidi, Z. S.
Shariff, N. N. M.
Monstein, C.
Powiązania:
https://bibliotekanauki.pl/articles/412644.pdf
Data publikacji:
2014
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
CALLISTO
Radio Frequency Interference (RFI)
RFI sources
solar radio burst
Opis:
Continuous observation of solar radio burst in CALLISTO network was started since 2002 with Blein Switzerland is the first site that launched the system. Since then, there are more than 35 sites around the world that monitor the Sun activity within 24 hours until 2014. However, there is an issue of Radio Frequency Interference (RFI) that need to be considered. This noise is a major obstacle when performing observation with CALLISTO system. We selected 4 sites as preliminary analysis to analyze in detailed at a specific frequency which is very important in solar burst monitoring. The selected sites are (i) Blein, Switzerland (ii) Mauritius (iii) KASI Korea and (iv) ANGKASA, Malaysia. The regime narrow band that we focused are from (i) 72 – 75 MHz (ii) band 145 – 153 MHz (iii) 240 – 250 MHz (iv) 320 – 330 MHz (v) 406 – 410 MHz. The results of the sources of the RFI also will be highlighted. This work is was part of a larger study which focuses on a specific region that can be used for detailed investigation of solar burst. This issue of Radio Frequency Interference (RFI) needs a dialogue and interactions between different actors and networks.It is hoped that the analysis will help the solar physicist to choose a better data.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2014, 11, 2; 135-145
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnetotransport Characterization of HgCdTe Solid Solutions Structural Quality
Autorzy:
Berchenko, N. N.
Kurbanov, K. R.
Nikiforov, A. Yu.
Powiązania:
https://bibliotekanauki.pl/articles/1933722.pdf
Data publikacji:
1995-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
72.80.Ey
Opis:
It has been demonstrated that variable-magnetic-field Hall measurements for n-Hg$\text{}_{1-x}$Cd$\text{}_{x}$Te samples in the extrinsic and intrinsic conductivity regions permit to identify and to evaluate semiqualitatively electrical activity of extended defects in this material.
Źródło:
Acta Physica Polonica A; 1995, 88, 4; 679-682
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Understanding climate changes in Malaysia through space weather study
Autorzy:
Hamidi, Z.S.
Shariff, N.N.M.
Monstein, C.
Powiązania:
https://bibliotekanauki.pl/articles/11399.pdf
Data publikacji:
2014
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
climate change
Malaysia
weather
Sun
solar activity
Earth
interaction
Opis:
Space weather has a close connection with the interaction of the Earth and the Sun. As equatorial country, the characteristic features of the climate of Malaysia are uniform temperature, very high humidity and copious rainfall. Malaysia has an average of temperature of 26.7 °C per year. Therefore, it is suitable to monitor the Sun. In the following work, we will emphasize the development of Sun monitoring in Malaysia. The number of observatories are increasing. A dedicated work to understand the Sun activity in radio region is a part of an initiative of the United Nations together with NASA in order to support developing countries participating in „Western Science‟ research. Realizing how important for us to monitor the space weather, therefore, we have been utilizing the new radio spectrometer, CALLISTO (Compound Low Cost Low Frequency Transportable Observatories) spectrometer. Malaysia is one of the earliest country from South- East Asia (ASEAN) that involve this research. One of the advantages to start the solar monitoring in Malaysia is because our strategic location as equator country that makes possible to observing a Sun for 12 hours daily throughout a year. We strongly believe that Malaysia as one of contributor of solar activity data through E-CALLISTO network. This is a very good start for developing a space weather in Malaysia. With the implementation of CALLISTO systems and development of solar monitoring network, a new wavelength regime is becoming available for solar radio astronomy. Overall, this article presents an overview of space weather in Malaysia. With the present level of the international collaboration, it is believed that the potential involvement of local and international scientist in space weather will increase.
Źródło:
International Letters of Natural Sciences; 2014, 08, 1
2300-9675
Pojawia się w:
International Letters of Natural Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optical and Dispersion parameters of ZnS Thin Films Prepared by Flash Evaporation Method
Autorzy:
Bakr, N. A.
Jandow, N. N.
Habubi, N. F.
Powiązania:
https://bibliotekanauki.pl/articles/412057.pdf
Data publikacji:
2014
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
ZnS thin film
flash evaporation
Swanepoel technique
single oscillator model
Opis:
Zns thin films are obtained by flash evaporation method onto preheated glass substrates. The transmittance analysis allowed the determination of refractive index and thickness using envelope method. It was found that the refractive dispersion data obeyed the single oscillator model. The calculated value of the refractive index (n0 ) was found to be equal to 2.27, which is in a good agreement with the value obtained from Cauchy’s fitting. Also the value of the optical energy gap, extinction coefficient, real and imaginary parts of the dielectric constant and optical conductivity have been measured.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2014, 20, 1; 52-63
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The administration of leadership training programs enhance the trainees’ motivation to learn
Administracja programów szkoleniowych zwiększająca motywację uczestników do nauki
Autorzy:
Ismail, A.
Zainol, N. A. M.
Ahmad, N. N.
Powiązania:
https://bibliotekanauki.pl/articles/362290.pdf
Data publikacji:
2017
Wydawca:
Wyższa Szkoła Logistyki
Tematy:
course content
instructors’ roles
motivation to learn
SmartPLS
kurs szkoleniowy
rola instruktora
motywacja do nauki
Opis:
Background: The aim of this paper is to examine the relationship between the administration of leadership training programs and trainees’ motivation to learn. Self-administered questionnaires were distributed to collect data from junior army leaders in Peninsular Malaysia. Methods: A cross sectional method was employed in this study because it allowed the researchers to integrate the LTP literature, the pilot study and the actual survey as the main procedures to collect data. Beside a purposive sampling technique was used to distribute 300 self-report questionnaires to junior army leaders at the organization and the survey questionnaire data were analyzed using SmartPLS. Results: The results show that the ability of senior administrators to appropriately use a well-designed course content and select the right instructors to teach and facilitate trainees had enhanced trainees’ motivation to learn in the organizational sample. Conclusions: This study tested a conceptual schema developed based on the LTP research literature. The results of the confirmatory factor analysis showed that the instrument used in this study satisfactorily met the standard of validity and reliability analyses. Furthermore, the outcomes of the SmartPLS path model proved that course content and instructors’ roles were important predictors of trainees’ motivation to learn in the organizations.
Wstęp: Celem pracy było zbadanie związku między administracją programów szkoleniowych zarządzania a motywacją uczestników do nauki. W tym celu zostały skierowane ankiety do młodych przywódców armii w Malezji. Metody: Zastosowano metodę krzyżową, jako główną metodą zbierania danych, aby lepiej połączyć istniejące publikacje naukowe, badanie pilotażowe oraz aktualne badania. Zastosowano badanie ankietowe na próbie losowej 300 młodych przywódców armii. Uzyskane wyniki poddano analizie przy zastosowaniu SmartPLS. Wyniki: Wyniki wskazują na zdolność doświadczonych administratorów na prawidłowe stosowanie dobrze przygotowanych materiałów szkoleniowych oraz na dobór właściwych instruktorów do prowadzenia szkoleń oraz zwiększenia motywacji uczestników do nauki w badanej organizacji. Wnioski: Testowano koncepcyjny schemat opracowany na podstawie przeglądu literatury naukowej. Wyniki przeprowadzonej analizy wykazują, że instrument użyty w pracy w sposób satysfakcjonujący spełnił standardy analizy trafności oraz niezawodności. Wyniki modelu ścieżki SmartPLS zaakceptowały treści szkoleniowej oraz rolę instruktorów, jako ważnych czynników wpływających na poziom motywacji uczestników do nauki w badanej organizacji.
Źródło:
LogForum; 2017, 13, 4; 465-477
1734-459X
Pojawia się w:
LogForum
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ob osobennostjakh razvitija lichinok trikhinell, vydelennykh iz myshc enota poloskuna, u belykh myshejj
O osobliwościach rozwoju w organizmie białych myszy larw włośni wyosobnionych z mięśni szopa pracza (Procyon lotor)
On the developmental particularities of T. spiralis larvae isolated from the racoon (Procyon lotor) muscles - in albino mice
Autorzy:
Pereverzeva, E.V.
Ozereckovskaja, N.N.
Veretennikova, N.L.
Powiązania:
https://bibliotekanauki.pl/articles/2176283.pdf
Data publikacji:
1974
Wydawca:
Polskie Towarzystwo Parazytologiczne
Źródło:
Wiadomości Parazytologiczne; 1974, 20, 1; 67-80
0043-5163
Pojawia się w:
Wiadomości Parazytologiczne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Correlation between Radio Flux (10.7 cm) and Sunspot Number Based on Statistical Properties
Autorzy:
Hamidi, Z. S.
Shariff, N. N. M.
Monstein, C.
Powiązania:
https://bibliotekanauki.pl/articles/1189949.pdf
Data publikacji:
2016
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Sun
solar burst
radio region
solar flare
Coronal Mass Ejections (CMEs)
Opis:
Statistical properties of solar radio burst radio type II and III of this work will be highlighted. One of the best advantages of using the radio method is that it allows high quality images within an arc second resolution and different frequencies actually cover different layers of the solar atmosphere. Statistical studies of both bursts are required to obtain such observational constraints with sufficient statistical confidence. In the first part, the trend of both bursts from 2006-2011 is examined. We need to consider a few parameters such as a burst duration, drift rate, energy of the photon, and the structure of the burst. From (0.0 0.5) MHz/Sec, the data represent the highest slope with m = 1290.1685 km/MHz in average. In the range of (4.0 7.0) MHz/Sec, the range of CMEs velocity is less than 500km/Sec. The lowest CMEs velocity that can be observed is ~137 km/Sec. The relationship between both parameters is F10.7cm = 0.4568R + 73.8655. This work presents the first step toward an analytical model of statistics of solar radio burst information of average events as something crucial to the acceleration mechanism.
Źródło:
World Scientific News; 2016, 52; 70-80
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wpływ agrotechnicznego zagęszczenia zmeliorowanej gleby torfowej pod zagospodarowaną łąką na jej właściwości agrochemiczne
The effect of agro- technical compaction of reclaimed peat soil under managed meadow on its agro-chemical properties
Autorzy:
Ševcov, A., V.
Šukin, N. N.
Zotov, A. A.
Powiązania:
https://bibliotekanauki.pl/articles/337873.pdf
Data publikacji:
2011
Wydawca:
Instytut Technologiczno-Przyrodniczy
Tematy:
gleba
humifikacja
łąka
mineralizacja
osuszenie
renowacja łąki
warunki wodne
zagęszczenie mechaniczne gleby
drainage
humification
meadow
meadow restoration
mechanical soil compaction
mineralization
soil
water relations
Opis:
W pracy przestawiono wyniki badań nad wpływem agrotechnicznego zagęszczenia na agrochemiczne właściwości gleby na zmeliorowanym torfowisku niskim w centralnym rejonie leśnej strefy Rosji. Zbadano wpływ nacisku agregatów uprawowych na procesy mineralizacji, humifikacji i naruszenie uwarunkowanego genetycznie stosunku między poszczególnymi (Ca i N) pierwiastkami w torfie.
The paper presents results of a study on the effect of agro-technical compaction on agro-chemical soil properties in reclaimed lowland marsh in central region of the forested zone in Russia. The effect of the pressure exerted by agricultural machines on mineralization, humification and disturbance of genetically determined proportion between particular elements (Ca and N) in peat were analysed.
Źródło:
Woda-Środowisko-Obszary Wiejskie; 2011, 11, 4; 209-215
1642-8145
Pojawia się w:
Woda-Środowisko-Obszary Wiejskie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Development of Solar Astronomy In Malaysia
Autorzy:
Hamidi, Z. S.
Shariff, N. N. M.
Monstein, C.
Powiązania:
https://bibliotekanauki.pl/articles/411541.pdf
Data publikacji:
2014
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
sun
radio emission
solar radio burst
Compound Astronomical Low-cost Low-frequency Instrument for Spectroscopy in Transportable Observatories
CALLISTO
solar flares
Coronal Mass Ejections
CMEs
space Feather
Opis:
Monitoring the Sun reveals a variety of fascinating and complex physical phenomena which are being studied mainly by analyzing its emission. Solar activity has an impact with space weather. The characteristic features of the climate of Malaysia are uniform temperature, very high humidity and copious rainfall. It has an average of temperature of 26.7 ºC. Therefore, it is suitable to monitor the Sun. In following work, we will emphasize the development of solar astronomy in Malaysia. The ground based observation (i) optical and (ii) radio are the main region that we focused on. Optical observation has started earlier comparing with radio observation. In optical region it covers from 400 –700 nm while in radio region, we focus from 45 MHz to 870 MHz. The number of observatories is increasing. A dedicated work to understand the Sun activity in radio region is a part of an initiative of the United Nations together with NASA in order to support developing countries participating in „Western Science‟ research. Realize how important for us to keep doing a research about the solar bursts, by using the new radio spectrometer, CALLISTO (Compound Low Cost Low Frequency Transportable Observatories) spectrometer. Malaysia is one of the earliest country from South-East Asia (ASEAN) that involve this research. One of the advantages to start the solar monitoring in Malaysia is because our strategic location as equator country that makes possible to observing a Sun for 12 hours daily throughout a year. We strongly believe that Malaysia as one of contributor of solar activity data through E-CALLISTO network. This is a very good start for developing a radio astronomy in Malaysia. With the implementation of 45 MHz -870 MHz CALLISTO systems and development of solar burst monitoring network, a new wavelength regime is becoming available for solar radio astronomy. Overall, this article presents an overview of optical and radio astronomy in Malaysia. With the present level of the international collaboration, it is believed that the potential involvement of local and international scientist in solar astrophysics will increase.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2014, 19, 1; 46-55
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fundamental and Second Harmonic Bands of Solar Radio Burst Type II Caused by X1.8 - Class Solar Flares
Autorzy:
Hamidi, Z. S.
Shariff, N. N. M.
Monstein, C.
Powiązania:
https://bibliotekanauki.pl/articles/411652.pdf
Data publikacji:
2014
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
solar physics
radio burst
type II
Zeeman Effect
solar flare
CALLISTO
Opis:
An extreme 2012 October 23 solar flare event marked on the onset of the CALLISTO data, being one of the highest solar flare event that successfully detected. The formation of harmonic solar burst type II in meter region and their associated with X1.8-class solar flares has been reported. This burst has been observed at the National Space Centre, Banting, detected by the Compound Astronomical Low-cost Low-frequency Instrument for Spectroscopy and Transportable Observatory (CALLISTO) system in the range of 150-400 MHz in the low frequency band. It occurred between 3.17:45 UT to 3.19:00 UT within 1 minute 15 seconds. The Compound Astronomical Low-cost Low-frequency Instrument for Spectroscopy and Transportable Observatory CALLISTO spectrometer is a solar dedicated spectrometer system that has been installed all over the world to monitor the Sun activity in 24 hours. The growth of this burst is often accompanied by abundance enhancement of particles which may take the form of multiple independent drifting bands or other forms of fine structure. Due to the results, the drift rate of this burst is 2.116 MHz s–1, which is considered as a slow drift rate. These drifting bands are approximately having a frequency ratio 2:1. This burst is a particular interest, though of sporadic and infrequent occurrence. The splitting is due to the effect of magnetic splitting, analogous to the Zeeman Effect. This is one of the examples which the type II burst is not always associated with CMEs event. The combination of radio and x-ray region give a complete view of the solar flare eruption from e active region AR1598. Both different electromagnetic spectrum shows the exact time. Other interesting results is that this type II burst is not associated with CMEs as usual, but due to the very high solar flare event with a fundamental form at more than 100 MHz. An extension of the present work will be a detailed study of the possible triggering and the driving mechanism of solar flare explosion.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2014, 14, 2; 208-217
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Disturbances of Solar Eruption From Active Region AR1613
Autorzy:
Hamidi, Z. S.
Shariff, N. N. M.
Monstein, C.
Powiązania:
https://bibliotekanauki.pl/articles/411713.pdf
Data publikacji:
2014
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
solar radio emission
solar burst type III
e-CALLISTO
solar flare
Active Region AR1613
Opis:
The paper describes an investigation of the solar radio bursts of spectral type III due to disturbances of the active region AR 1613. A solar flare occurred on 2012 November 15, between 2:00 UT to 3:30 UT. The sequence images from a burst from our site revealed that although the solar flare is considered moderate, it is still possible to obtain the solar burst type III in a single and group forms within one and half hour. It can easily produce misleading results in terms of non-thermal electron density and magnetic field strength. The burst is originated in the same active region of the solar corona. The C-6 level enhancement was detected in GOES 1.8 a soft X-ray. Based on the results, we suggest that radio wave source motion manifests the displacement of particle sites caused by plasma eruptions. Time variability in the emission may due to the changes in the electron density. The group and individual solar burst type III can be related to the distance travelled before an electron beam becomes unstable to Langmuir waves. In conclusion, the interactions non-thermal electron and magnetic trapping can influence the transporting of electrons and this is still a subject of interest of intense investigation.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2014, 13, 1; 77-87
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Type II Solar Radio Burst with a Split and Herring − Bones During a Minimum Solar Activity
Autorzy:
Hamidi, Z. S.
Shariff, N. N. M.
Monstein, C.
Powiązania:
https://bibliotekanauki.pl/articles/411839.pdf
Data publikacji:
2014
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
sun
low frequency
solar radio
burst
type II
e-CALLISTO
Opis:
A preliminary correlation study of the herring − bone type II with a type III solar burst of has been made. On the basis of this study and in combination with the observation in radio emission, an interpretation of the mechanism of the occurrence of this event has been proposed. The type II solar radio burst with a split and herring bone is occurring at the same time from 36 MHz till 50 MHz. We have noted that an individual type III burst also can be observed at 13:23 UT from 45-50 MHz. During that day, a stream of solar wind from a coronal hole on the Sun has disturbing Earth's magnetosphere creating a minor geomagnetic storm, G1 on the NOAA scale of G1-G5. In this case, the solar flare is not very high, but CME is responsible to form a solar radio burst type II. Overall, based on seven days observation beginning from 25th March 2013, the solar activity is considered as very low. The highest solar flare can be observed within 7 days is only a class of B8 flare. There was no CMEs event that directed to the Earth is detected. The geomagnetic field activities are also at minimum level. Although the solar flare event is at a lower stage, it is still possible to form the solar radio burst type II which is associated with CME event. From the selected event, although theoretically solar radio burst type II is associated with CMEs, there is no compelling solar radio burst type II without a flare. The only difference is the dynamic structure and the intensity and speed of both phenomena (solar flares and CMEs) which depend on the active region. Nevertheless, understanding how energy is released in solar flares is one of the central questions in astrophysics. This solar radio burst type II formation is the first event that successfully detected by e-CALLISTO network in 2013.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2014, 13, 2; 104-111
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Statistical Study of Nine Months Distribution of Solar Flares
Autorzy:
Hamidi, Z. S.
Shariff, N. N. M.
Monstein, C.
Powiązania:
https://bibliotekanauki.pl/articles/412246.pdf
Data publikacji:
2014
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
sun
solar eclipse
solar radio
burst
type III
e-CALLISTO
Opis:
Solar flare is one of the solar activities that take place in the outermost layer of the corona. Solar flares can heat the material to several million degrees in just a few minutes and at the same time they release the numerous amount of energy. It is believed that a change of magnetic field lines potentially creates the solar flares. The objectives of the study are to identify and compare the types of solar flares (in X-Ray) region and to improve understanding of solar flares. Data are taken from the NOAA website, from the United States Department of Commerce, NOAA, Space Weather Prediction Center (SPWC). Solar radio flux readings were merged together with the three classes and a total of nine graphs were plotted. In illustrating the relationship of solar radio flux and solar flares, it can be explained by studying the range values of flux corresponding to flares values. From this case study, it was found that the minimum value of solar radio flux in order for the flares to occur is equivalent 68 x 10-22Wm-2Hz-1. Thus, whenever the values of solar radio flux are high, there should be a higher number of flares produced by the sun. The overall range of solar radio flux recorded in this study ranging from 68 x 10-22 Wm-2Hz-1 to 96 x 10-22 Wm-2Hz-1. Observing and collecting data from the Sun and develop our very own new prediction methods will leads the accuracy of the prediction of the behavior of the Sun more precisely.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2014, 14, 1; 1-11
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparison of the Radio Frequency Interference (RFI) in the Region of Solar Burst Type III Data At Selected CALLISTO Network
Autorzy:
Hamidi, Z. S.
Shariff, N. N. M.
Monstein, C.
Powiązania:
https://bibliotekanauki.pl/articles/412319.pdf
Data publikacji:
2014
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
CALLISTO
low frequency
solar burst type III
Radio Frequency Interference (RFI)
Opis:
Compact Astronomical Low-frequency, Low-cost Instrument for Spectroscopy in Transportable Observatories (CALLISTO) is a global network of spectrometer system with the purpose to observe the Sun’s activities. There are 25 stations that are used for this purpose. Radio Frequency Interference (RFI) is a major obstacle when performing observation with CALLISTO. We have confirmed at least 2 stations out of 10 stations with a complete overview spectral (OVS) made available to us showed clear detection of these consistent types of RFI for each specific region. In Malaysia, these RFI are also clearly detected. The major RFI affecting CALLISTO within radio astronomical windows below 1 GHz are local electronic system specifically radio navigation (at 73.1 MHz and 75.2 MHz), broadcasting (at (i) 151 MHz, (ii) 151.8 MHz and 152 MHz), aeronautical navigation (at (i) 245.5 MHz, (ii) 248.7 MHz and (iii) 249 MHz and fixed mobile at (i) 605 MHz, (ii) 608.3 MHz, (iii) 612.2 MHz, (iv) 613.3 MHz). It is obviously showed that all sites within this region are free from interference at 320-330 MHz and is the best specific region to be considered for solar burst monitoring. We also investigate the effect of RFI on detection of solar burst. We have considered type III solar bursts on 9th March 2012 in order to measure the percentage of RFI level during the solar burst. The RFI level is as low as 6.512 % to 80.769 % above solar burst detection.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2014, 10; 38-45
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Radio Observation of Coronal Mass Ejections (CMEs) Due to Flare Related Phenomenon on 7th March 2012
Autorzy:
Hamidi, Z. S.
Monstein, C.
Shariff, N. N. M.
Powiązania:
https://bibliotekanauki.pl/articles/412379.pdf
Data publikacji:
2014
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Radio burst
solar flare
Coronal Mass Ejections (CMEs)
e-CALLISTO
Active Region 1429
Opis:
On March 7th, 2012, an active region AR1429 has unleashed 2 major X-class solar flares. This flare is accompanied by a Coronal Mass Ejections (CMEs) event. A pair of unusually large solar flares early March 7, 2012 generated a Coronal Mass Ejection that was expected to reach Earth around midday March 8. In this case we focused on the second explosion of solar flare. It is found that the indication of signal potentially drives Coronal Mass Ejections (CMEs). There are a few types solar burst that can be observed, which is (i) an individual type III (ii) a complex type III (iii) subtype an H type II solar burst and (iv) type IV solar burst. The duration of solar burst is start from 1:02 UT to 2:00 UT. We also compare our results with the Geostationary Operational Environmental Satellites (GOES) data. Overall, one hour duration with a strong intensity burst are exploded strongly within the period. The fast drift type III burst has continued until 1:28 UT is associated with the large X 5.4 -class solar flares at 1:25:05 UT. It is undeniable that solar flare plays an important role in the Sun-Earth connection due to sudden changes of strong magnetic fields in the Sun’s corona. From our analysis, one possible reason behind the formation of this very complex, long duration of this loop is the magnetic reconnection and disruption of the loops which is observed during flare maximum. Until now, there has been an increasing interest in the space weather program has stimulated interest in this issue. A new experimental approach by e-CALLISTO with 24 hours monitoring and further development of a model of the theory are hoping to meet the current knowledge about the Sun behaviour.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2014, 11, 3; 243-256
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Tendencies and Timeline of the Solar Burst Type II Fragmented
Autorzy:
Hamidi, Z. S.
Shariff, N. N. M.
Monstein, C.
Powiązania:
https://bibliotekanauki.pl/articles/412634.pdf
Data publikacji:
2014
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
sun
low frequency
solar radio
burst
type II
type III
e-CALLISTO
Opis:
We report the timeline of the solar radio burst Type II that formed but fragmented at certain point based on the eruption of the solar flare on 13th November 2012 at 2:04:20 UT. The active region AR 1613 is one of the most active region in 2012. It is well known that the magnetic energy in the solar corona is explosively released before converted into the thermal and kinetic energy in solar flares. In this work, the Compound Astronomical Low-frequency, Low-cost Instrument for Spectroscopy Transportable Observatories (CALLIISTO) system is used in obtaining a dynamic spectrum of solar radio burst data. There are eight active regions and this is the indicator that the Sun is currently active. Most the active regions radiate a Beta radiation. The active regions 1610, 1611 and 1614 are currently the largest sunspots on the visible solar disk. There is an increasing chance for an isolated M-Class solar flare event. It is also expected that there will be a chance of an M flare, especially from AR 1614 and 1610. Although these two observations (radio and X-rays) seem to be dominant on the observational analysis, we could not directly confirmed that this is the only possibility, and we need to consider other processes to explain in detailed the injection, energy loss and the mechanism of the acceleration of the particles. In conclusion, the percentage of energy of solar flare becomes more dominant rather than the acceleration of particles through the Coronal Mass Ejections (CMEs) and that will be the main reason why does the harmonic structure of type II burst is not formed. This event is one fine example of tendencies solar radio burst type III, which makes the harmonic structure of solar radio burst type II fragmented.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2014, 12; 84-102
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Enhancement of Solubility and Mass Transfer Coefficient of Benzoic Acid Through Hydrotropy
Autorzy:
Prakash, G.D.
Kumar, S.T.
Gandhi, N.N.
Powiązania:
https://bibliotekanauki.pl/articles/779266.pdf
Data publikacji:
2013
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
hydrotropy
solubilization
mass-transfer coefficient
benzoic acid
Opis:
The effect of hydrotropes such as sodium salicylate, sodium benzoate, and nicotinamide on the solubility and mass transfer coefficient of benzoic acid has been investigated. The solubility studies were carried out under a wide range of hydrotrope concentrations (0 to 3.0 mol/L) and different system temperatures (303K to 333K). It has been observed that the solubility and mass transfer coefficient of benzoic acid increases with an increase in hydrotrope concentration and also with system temperature. A Minimum Hydrotrope Concentration (MHC) was found essential to initiate a significant increase in the solubility and the mass transfer coefficient. The maximum enhancement factor (?s), which is the ratio of the solubility value in the presence and absence of a hydrotrope, has been determined for all sets of experimentations. The solubility of benzoic acid has been enhanced to 19.98 times in the presence of 2.5 mol/L concentration of sodium salicylate hydrotrope at 333K.The effectiveness of hydrotropes was measured in terms of Setschenow constant Ks and the highest value has been observed as 0.502 for sodium salicylate.
Źródło:
Polish Journal of Chemical Technology; 2013, 15, 1; 46-50
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparative study of uni-univalent H⁺/Na⁺ and uni-bivalent H⁺/Ca²⁺ ion exchange reactions using nuclear grade resin Indion-223
Autorzy:
Singare, P. U.
Mohammed, A. L. K.
Dixit, N. N.
Powiązania:
https://bibliotekanauki.pl/articles/411747.pdf
Data publikacji:
2014
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
ion exchange reactions
nuclear grade resins
cation exchange resins
enthalpy
equilibrium constant
Indion-223
Opis:
The present paper deals with the ion exchange equilibrium studies of uni-univalent and uni-bivalent ion exchange reactions using nuclear grade anion exchange resin Indion-223 in H⁺ form towards Na⁺ and Ca²⁺ ions in the solution. It was observed that with rise in temperature the equilibrium constants K values for H⁺/Na⁺ uni-univalet ion exchange reaction increases from 0.01389 to 0.01855. Similarly for H⁺/Ca²⁺ uni-bivalet ion exchange reaction the equilibrium constants K values increases from 0.000397 to 0.000639. The increase in equilibrium constant values with rise in temperature indicate endothermic ion exchange reactions having the enthalpy change values of 25.55 and 38.92 kJ/ mol respectively.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2014, 14, 2; 127-135
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study of uni-univalent H+/K+ and uni-bivalent H+/Mg2+ ion exchange reactions using nuclear grade resin Indion-223
Autorzy:
Singare, P. U.
Mohammed, A. K. L.
Dixit, N. N.
Powiązania:
https://bibliotekanauki.pl/articles/411848.pdf
Data publikacji:
2014
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
ion exchange equilibrium
nuclear grade resins
cation exchange
enthalpy change
equilibrium constant
Indion-223
Opis:
In the present paper the uni-univalent and uni-bivalent ion exchange reactions were investigated using nuclear grade anion exchange resin Indion-223 in H+ form. For both H+/K+ uni-univalet ion exchange reactions and H+/Mg2+ uni-bivalet ion exchange reactions, the equilibrium constant K values increases from 0.01710 to 0.02374 and from 0.000177 to 0.000333 respectively as the reaction temperature rises from 35.0 °C to 45.0 °C. The increase in K values with temperature suggest endothermic ion exchange reactions having the enthalpy change values of 22.72 and 51.46 kJ/ mol respectively. The results of such studies will help in selection of suitable ion exchange resins in order to bring about efficient separation of different ionic species present in the waste water effluents released from nuclear as well as chemical process industries.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2014, 14, 2; 231-239
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ion exchange equilibrium studies of uni-univalent H+/Na+ and uni-bivalent H+/Mg2+ ion exchange reactions using nuclear grade resin Indion-223
Autorzy:
Singare, P. U.
Mohammed, A. L. K.
Dixit, N. N.
Powiązania:
https://bibliotekanauki.pl/articles/412153.pdf
Data publikacji:
2014
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
cation exchange
nuclear grade resins
ion exchangers
change in enthalpy
equilibrium constant in standard state
Indion-223
Opis:
In the present investigation the uni-univalent and uni-bivalent ion exchange reactions were studied using nuclear grade anion exchange resin Indion-223 in H+ form. It was observed that for H+/Na+ uni-univalet ion exchange reaction, with rise in temperature the equilibrium constants K values increases from 0.01389 to 0.01855. Similarly increase in K values was observed from 0.000177 to 0.000333 for H+/Mg2+ uni-bivalet ion exchange reaction. The increase in equilibrium constant values with rise in temperature indicate endothermic ion exchange reactions having the enthalpy change values of 25.55 and 51.46 kJ/ mol respectively. It is expected that the present study will provide valuable information in order to decide about the selection of those resins for efficient separation of various ionic species present in the industrial waste water effluents.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2014, 14, 2; 199-207
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Gray Hoverman Antenna Construction for Meteor Observation
Autorzy:
Hamidi, Z. S.
Hamidin, M. Azril
Shariff, N. N. M.
Powiązania:
https://bibliotekanauki.pl/articles/1188079.pdf
Data publikacji:
2016
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Meteor; forward - scattering technique; radio region; gray Hoverman antenna
Opis:
Meteors typically are small particles, normally no larger than a microscopic of sand, that enter our atmosphere at speeds of up to around 70 kilometers per second. Meteoroids are thought to originate in asteroids or comets, though some may be remnants from the early days of the Solar System. When a meteoroid striking the upper atmosphere, these meteors are produced by the streams of cosmic debris at extremely high speeds on parallel trajectories. Radio meteor scatter by forward scattering is a technique for observing meteors. A forward - scattering technique for radio meteor detection has been well-known for over 50 years ago. The Gray-Hoverman antenna has been designed by Doyt R. Hoverman and was invented in the 1950s covers from 300 to 3000 MHz and shows high performance for most Digital / HD channels broadcasting. The data obtained from the special software named 4nec2. From the results, the high gain obtained by the antenna is around 14.4 dBi at targeted range frequencies of 500MHz to 700MHz. it can be clearly observed that the designed antenna structure provides good amount of gain 14.4 dB, which is highly desirable for various applications. In future, the current Gray Hoverman’s antenna can be improved by adding 2 or more antennas which are structured in series or parallel depending on compatibility.
Źródło:
World Scientific News; 2016, 56; 21-32
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experimental assessment of ionizing radiation low doses impact on teeth development
Autorzy:
Cheshko, N. N.
Berlov, H. A.
Pohodenko-Chudakova, I. O.
Powiązania:
https://bibliotekanauki.pl/articles/285397.pdf
Data publikacji:
2009
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Tematy:
ionizing radiation
teeth development
laboratory experiment
Źródło:
Engineering of Biomaterials; 2009, 12, no. 89-91; 8-9
1429-7248
Pojawia się w:
Engineering of Biomaterials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of ionizing radiation low doses on early stages of odontogenesis
Autorzy:
Cheshko, N. N.
Berlov, H. A.
Pohodenko-Chudakova, I. O.
Powiązania:
https://bibliotekanauki.pl/articles/285617.pdf
Data publikacji:
2008
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Tematy:
odontogenesis
ionizing radiation low doses
tooth germ
Źródło:
Engineering of Biomaterials; 2008, 11, no. 77-80; 7-8
1429-7248
Pojawia się w:
Engineering of Biomaterials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Assessment of physico-chemical properties of sediments collected along the Mahul Creek near Mumbai, India
Autorzy:
Singare, P.U.
Ansari, M.V.A.
Dixit, N.N.
Powiązania:
https://bibliotekanauki.pl/articles/11066.pdf
Data publikacji:
2014
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
assessment
physicochemical property
sediment
industrial effluent
toxic pollutant
Mahul Creek
Mumbai city
India
Opis:
The present study was performed for the period of one year from January 2013 to December 2013 in order to understand the physico-chemical properties of sediments samples collected along the Mahul Creek of Mumbai. The annual average pH value of the creek sediments was recorded as 5.38. It is feared that such low pH value of sediment might increase the acidity of creek water thereby triggering the heavy metal toxicity which will further reduced survivorship in fish through chronic stress and affect the reproductive partner. The annual average salinity content of the sediment was recorded as 4601.17 ppm. It is important here to note that the high salinity of the sediment may increase the salinity level of creek water which is considered as a major stress factor for most freshwater organisms including crustaceans. The average annual concentration of phosphate in the creek sediment was found to 480.39 ppm. Such high concentration of phosphate in the creek sediments might accelerate the process of eutrophication. From the results it appears that as India moves towards stricter regulation of industrial effluents to control water pollution, greater efforts are required to reduce the risk due to the toxic pollutants which are released into the ecosystems.
Źródło:
International Letters of Natural Sciences; 2014, 11, 1
2300-9675
Pojawia się w:
International Letters of Natural Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An Analysis of Radiation Pattern and Standing-Wave Ratio (SWR) of the Gray Hoverman Antenna
Autorzy:
Hamidi, Z. S.
Hamidin, M. Azril
Shariff, N. N. M.
Powiązania:
https://bibliotekanauki.pl/articles/1192610.pdf
Data publikacji:
2016
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Antenna
radiation pattern
radio region
gray Hoverman antenna
Opis:
The radio antenna may be defined as the structure associated with the region of transition between a guided wave and free-space wave, or vice versa. Antennas convert electrons to photon, or vice versa. All involve the same basic principle that the radiation is produced by accelerated or decelerated charge. In order to enhance the reading and measurement, forward scattering technique is used to acquire more data. The aim of this paper is to highlight the theory part of radiation pattern and the analysis of this parameter. From the results, the radiation pattern of the antenna with a range of 700 MHz with the range of -11.0 dB till 10.6 dB. The results show that the maximum front lobe value is 14.4 dB. The back lobe value is 3.32 dBi and the side lobe is -18 dBi. As the gain of a directional antenna increases, the coverage distance increases, but the effective coverage angle decreases due to the lobes being pushed in a certain direction because there is a little energy on the back side of the antenna. The SWR is high in the range of 1-100 MHz with 106 but suddenly decreased to 10 at 100 MHz. The patterns are very dynamics and it less that 10 from 530 MHz to 1000 MHz. We conclude that The simulation results of this antenna structure are quite good as this antenna structure can work in particular frequency bands with a good amount of gain of 14.4 dBi, the SWR of below 10dBi, and impedance matching around 100 ohm.
Źródło:
World Scientific News; 2016, 60; 13-25
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Interference Management using Power Control for Device-to-Device Communication in Future Cellular Network
Autorzy:
Nugraha, T. A.
Pamungkas, M. P.
Chamim, A. N. N.
Powiązania:
https://bibliotekanauki.pl/articles/958069.pdf
Data publikacji:
2018
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
cellular network
device-to-device communication
interference management
power control
Opis:
There are many scenarios that have been proposed for fifth generation (5G) networks. Some of them, if implemented, will bring fundamental changes at the architectural and node level. One example of such proposed technologies is device-to-device (D2D) communications which will change the nature of conventional cellular network design. D2D permits direct communication between two or more user devices without intervention of the base station (i.e. eNB). D2D can ensure network performance improvement over the traditional cellular network, because it can offload the mobile data traffic from the other devices. However, applying D2D features in a cellular network will bring about more complex interference problems, since D2D communication uses the same band as its underlying cellular communication network. The aim of this research is to investigate interference-related problems caused by D2D communications, affecting the underlying cellular networks, during downlink and uplink transmissions. The paper examines the use of power control methods to mitigate interference. A comparison is offered between fixed power level (FC) with or without power control, and adaptive power controls using two methods (AC1 and AC2), on a base station or on each of the D2D devices, based on the measured signal to interference plus noise ratio (SINR). The simulation results show that both power control methods contribute to improvement of network performance. AC1 and AC2 can improve SINR by about 1 dB and 0.5 dB compared to FC in a downlink transmission, and by 0.5 dB in an uplink transmission.
Źródło:
Journal of Telecommunications and Information Technology; 2018, 3; 31-36
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Toxic heavy metals in sediments of Mahul Creek near Mumbai, India
Autorzy:
Singare, P.U.
Ansari, M.V.A.
Dixit, N.N.
Powiązania:
https://bibliotekanauki.pl/articles/11831.pdf
Data publikacji:
2014
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
toxic metal
heavy metal
sediment
creek sediment
industrial effluent
Mahul Creek
India
Opis:
The present study was performed for the period of one year from January 2013 to December 2013 in order to understand the level of toxic heavy metals in the sediments of Mahul Creek near Mumbai. The annual average concentration of heavy metals like Cr, Zn, Cu, Ni, Pb, Cd, As and Hg was found to be 277.5, 121.7, 100.3, 63.8, 21.5, 14.6, 10.4 and 4.9 ppm respectively. It is feared that this heavy metals accumulated in the creek sediments may enter the water thereby creating threat to the biological life of an aquatic ecosystem. The results of present study indicates that the existing situation if mishandled can cause irreparable ecological harm in the long term well masked by short term economic prosperity due to extensive industrial growth.
Źródło:
International Letters of Natural Sciences; 2014, 10
2300-9675
Pojawia się w:
International Letters of Natural Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Toxic heavy metals in the Mahul Creek water of Mumbai, India
Autorzy:
Singare, P.U.
Ansari, M.V.A.
Dixit, N.N.
Powiązania:
https://bibliotekanauki.pl/articles/11858.pdf
Data publikacji:
2014
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
toxic metal
heavy metal
Mahul Creek
creek water
industrial effluent
India
Opis:
The present study was performed for the period of one year from January 2013 to December 2013 in order to understand the level of toxic heavy metals in the water of Mahul Creek near Mumbai. It was observed that the annual average concentration of heavy metals like Cd, As, Hg, Cr, Pb, Cu, Ni and Zn, was found to be 0.003, 0.004, 0.0009, 0.012, 0.015, 0.019, 0.04 and 0.23 ppm respectively. The results suggest that there is a need to have such scientific monitoring for longer time period in order to understand the trend in level of these toxic heavy metals discharged in to the creek water. It is feared that the existing problem if ignored may increase the level of this heavy metals in creek water thereby creating threat to the biological life of an aquatic ecosystem. From the results of the present investigation it seems that the time has come to move towards ecosystem specific discharge standards to maintain the health and productivity of natural resources on which the majority of Indians are dependent.
Źródło:
International Letters of Natural Sciences; 2014, 10
2300-9675
Pojawia się w:
International Letters of Natural Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Water pollution along the Mahul Creek of Mumbai, India – Study of physico-chemical properties
Autorzy:
Singare, P.U.
Ansari, M.V.A.
Dixit, N.N.
Powiązania:
https://bibliotekanauki.pl/articles/10886.pdf
Data publikacji:
2014
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
water pollution
Mahul Creek
creek water
Mumbai city
India
physicochemical property
industrial effluent
Opis:
The present study was performed for the period of one year from January 2013 to December 2013 in order to understand the physico-chemical properties of Mahul Creek water. From the results of our study it was observed that the annual average COD level was 362.09 ppm which was far higher than the maximum tolerable level of 250 ppm set for inland surface water as well as for marine coastal water. The annual average conductivity was found to be 6122.81 μS cm-1 which was very much above the conductivity limit for inland surface water of 1000 μS cm-1 set by Central Pollution Control Board (CPCB) for propagation of fisheries. The annual average total alkalinity level was recorded as 166.25 ppm, which according to the UN Department of Technical Cooperation for Development (1985) was found to be strongly alkaline. The annual average hardness level of the creek water was found to be 2488.65 ppm which was above the limit of 300 ppm set by ISI. From the results of the present investigation it seems that the time has come to implement proper effluent water treatment techniques and enforcement of pollution control by the regulatory authority on the indiscriminate discharge of industrial wastewater into water bodies.
Źródło:
International Letters of Natural Sciences; 2014, 11, 1
2300-9675
Pojawia się w:
International Letters of Natural Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study on preferential selectivity of nuclear grade resin Indion-223 towards some bivalent ions
Autorzy:
Singare, P. U.
Mohammed, A. L. K.
Dixit, N. N.
Powiązania:
https://bibliotekanauki.pl/articles/412085.pdf
Data publikacji:
2014
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
bivalent exchange reactions
nuclear grade resins
cation exchange
reaction thermodynamics
enthalpy change
ionic selectivity
equilibrium constant
Indion-223
Opis:
In the present paper attempts are made to understand the selectivity of nuclear grade cation exchange resin Indion-223 in H+ form towards Ca2+ and Mg2+ bivalent ions in the solution based on thermodynamic concept. It was observed that with rise in temperature the equilibrium constant K values for H+/Ca2+ uni-bivalet ion exchange reactions increases from 0.000397 to 0.000639. Similarly for H+/Mg2+ uni-bivalet ion exchange reactions the equilibrium constant K values increases from 0.000177 to 0.000333. The increase in equilibrium constant values with rise in temperature indicate endothermic ion exchange reactions having the enthalpy change values of 38.92 and 51.46 kJ/ mol respectively. The difference in K values and enthalpy values were used to predict the selectivity behaviour of the resin towards the Ca2+ and Mg2+ bivalent ions in the solution. The thermodynamic concept of the present study can be applied to understand the selectivity behaviour of different nuclear as well as non-nuclear grade resins towards wide range of ionic species present in the exchanging liquid medium.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2014, 15; 11-21
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thermodynamics of uni-univalent H+/K+ and uni-bivalent H+/Ca2+ ion exchange reactions using nuclear grade resin Indion-223
Autorzy:
Singare, P. U.
Mohammed, A. L. K.
Dixit, N. N.
Powiązania:
https://bibliotekanauki.pl/articles/412388.pdf
Data publikacji:
2014
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
ion exchange
nuclear grade resins
cation exchangers
enthalpy change
standard equilibrium constant
Indion-223
Opis:
The present paper deals with the thermodynamic of uni-univalent and uni-bivalent ion exchange reactions using nuclear grade anion exchange resin Indion-223. It was observed that with rise in temperature the equilibrium constants K values for H+/K+ uni-univalet ion exchange reaction increases from 0.01710 to 0.02374. Similarly for H+/Ca2+ uni-bivalet ion exchange reaction the equilibrium constants K values increases from 0.000397 to 0.000639. The increase in K values with rise in temperature for both the reactions indicates its endothermic nature having the enthalpy change values of 22.72 and 38.92 kJ/ mol respectively. The technique used here can be extended further to standardise the process parameters in order to bring about the efficient separation of the desired ionic species from the solution.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2014, 14, 2; 190-198
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thermodynamic study to evaluate the selectivity behaviour of nuclear grade resin Indion-223 towards some univalent ions
Autorzy:
Singare, P. U.
Mohammed, A. L. K.
Dixit, N. N.
Powiązania:
https://bibliotekanauki.pl/articles/412486.pdf
Data publikacji:
2014
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
uni-univalent ion exchange reactions
ionic selectivity
nuclear grade resins
cation exchangers
enthalpy change
equilibrium constant
Indion-223
Opis:
The present paper deals with the application of thermodynamic concept in understanding the preferential selectivity of nuclear grade anion exchange resin Indion-223 in H+ form towards Na+ and K+ ions in the solution. In the study it was observed that the equilibrium constants K values for H+/Na+ and H+/K+ uni-univalet ion exchange reactions increases from 0.01389 to 0.01855 and from 0.01710 to 0.02374 respectively as the temperature increases from 35.0 °C to 45.0 °C. The increase in K values with rise in temperature suggests endothermic ion exchange reactions having the enthalpy change values of 25.55 and 22.72 kJ/ mol respectively. Based on difference in K values and enthalpy values for the two uni-univalent ion exchange reactions, the preferential selectivity of the resin for the univalent ions in the solution was predicted. From the results of present study, it appears that the experimental technique used here can be applied further to understand the ionic selectivity of different industrial grade ion exchange resins. It is expected that such studies will provide valuable information in order to decide about the selection of those resins for efficient separation of various ionic species present in the industrial waste water effluents.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2014, 15; 22-29
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Solar Burst Type IV Signature Associated with Solar Prominences on 20th January 2016
Autorzy:
Hamidi, Z. S.
Hamzah, N.
Shariff, N. N. M.
Monstein, C.
Powiązania:
https://bibliotekanauki.pl/articles/1178518.pdf
Data publikacji:
2017
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Coronal Mass Ejections (CMEs)
Sun
X-ray region
solar burst
solar flare
type IV radio region
Opis:
Proceeding from close association between solar eruptions, flare and CMEs, we analyze between burst at 980 MHz to 1270 MHz, recorded at the Blein, Switzerland on 20th January 2016. This burst indicates the emission radiation from the Sun from numerous high energy electrons in active region AR2484 and AR2487 forming a large prominence in that particular area. Solar prominences usually occur in loop shape and can last for weeks or months. This event allows us to investigate the electron density and drift rate of solar burst type IV During that time the Sun has the moderate number of sunspots with 55.The radio sources responsibly for IV appear to expand spherically through the solar corona after eject on y solar flare. This event shows a strong radiation in radio region, but not in X-ray region. This burst intense radio phenomena that follow with solar flares. It has a wide band and fine structure. It can be considered as an intermediate fast drift burst (IMDs). This fiber burst has a negative drift rate where the drift is interpreted by the group velocity of the whistler-mode waves. This burst appears is single SRBT III for approximately within 7 minutes with starting time is 8.23 UT. This burst duration is longer compared to the other events. It can be considered as a IV because it begins at the same time as the explosive phase of solar flare. The solar optical, radio and X-ray emission associated with these various energetic particle emissions as well as the propagation characteristics of each particle species are examined in order to study the particle acceleration and emission mechanisms in a solar flare. At the same time, the number of particles traveled a given path in reconnecting area falls exponentially with the increase of this path because of losses owing to a leaving of particles the acceleration volume due to drift.
Źródło:
World Scientific News; 2017, 70, 2; 111-121
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Milk yield and the chemical and mineral composition of milk from Kazakh black-variegated cows, offspring of Holstein-Friesian bulls from three lines
Autorzy:
Bermagambetova, N.N.
Naimanov, D.K.
Papusza, N.W.
Micinski, J.
Powiązania:
https://bibliotekanauki.pl/articles/15872.pdf
Data publikacji:
2016
Wydawca:
Uniwersytet Warmińsko-Mazurski w Olsztynie / Polskie Towarzystwo Magnezologiczne im. Prof. Juliana Aleksandrowicza
Opis:
The aim of this study was to determine the effect of 3 sire bulls from different genetic lines on the yield, chemical and mineral composition of milk produced by their daughters that belonged to black and variegated cattle kept in Kazakhstan, in the consecutive lactations and milking seasons. The research included 60 dairy cows, whose average share of HF breed genes did not exceed 50%. The cows were kept on a dairy farm called Wiktorowskoye, located near Tarnov (Kazakhstan). The highest milk yield, fat and protein content were recorded for the offspring of the bull Hamlet (H-239). The lowest body weight was achieved by daughters of Hamlet (H-239) and was significantly different from the other cows at p£0.01 and p£0.05. The milk yield per body weight (bw) showed that cows in the 3rd lactation produced 911 kg of milk/100kgb.w.. Daughters of Hamlet (H-239) distinguished themselves by the best milk yield to body weight conversion rate of 985 kg/100 kgb.w.. The ratio of protein to fat was satisfying and ranged from 0.82 (1st lactation) to 0.80 (3rd lactation). Cows from the group H-239 produced milk with the highest content of fat. In the 1st lactation, it equalled 3.95%, rising to 4.02% in the 3rd lactation. Depending on the milking season, the highest fat content was in the AU (4.02%) and WI seasons (3.99%) and the lowest one occurred in the SU season (3.87%). The highest protein content was observed in cows of group M-370 and amounted to 3.29% (primiparous cows) and 3.24% (3rd lactation) as well as 3.52% (WI) and 3.46 (AU). The highest content of SSC (2,464 thousand/cm3) was found in cows of group B-361 in the WI season, with statistical differences p £0.01 and p £ 0.05. The content of FFA was the highest in daughters of the bull M-370 bull, followed by the offspring of the bull H-239.
Źródło:
Journal of Elementology; 2016, 21, 3
1644-2296
Pojawia się w:
Journal of Elementology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
THE TRENDS OF DEVELOPMENT OF PHOSPHATE REGIME IN WESTERN BUG SURFACE WATERS ON THE TERRITORY OF UKRAINE
TENDENCJE ROZWOJU EUTRIFIZACJI FOSFORANOWEJ W WODACH POWIERZCHNIOWYCH ZACHODNIEGO BUGU NA TERENIE UKRAINY
ТЕНДЕНЦИИ ФОРМИРОВАНИЯ ФОСФАТНОГО РЕЖИМА ПОВЕРХНОСТНЫХ ВОД Р. ЗАПАДНЫЙ БУГ НА ТЕРРИТОРИИ УКРАИНЫ
Autorzy:
Voznyuk, N.N
Likho, E.A
Prischepa, A.N
Kopylova, O.M.
Powiązania:
https://bibliotekanauki.pl/articles/576649.pdf
Data publikacji:
2017
Wydawca:
Międzynarodowy Instytut Innowacji Nauka – Edukacja – Rozwój w Warszawie
Tematy:
biogenic elements, рhosphate, eutrophication, water quality, control point
odżywki, fosforany, eutrofizacja, jakość wód, punkty monitoringu
биогенные вещества, фосфаты, эфтрофикация, качество воды, пункты наблюдения
Opis:
W artykule opisano tendencje rozwoju eutrofizacji fosforanowej w wodach powierzchniowych Zachodniego Bugu na terenie Ukrainy. Autorzy wyjaśnili, że jednym z podstawowych zagadnień dotyczących wód powierzchniowych rzeki Zachodni Bug jest proces eutrofizacji, który jest spowodowany napływem nadmiernej ilości substancji biogenicznych, tj. składników odżywczych w tym fosforanów dla glonów i innych organizmów żyjących w rzece Bug. W celu zbadania dynamiki zmian zawartości fosforanów w dorzeczu Zachodniego Bugu, przeprowadzono analizę koncentracji fosforanów wzdłuż koryta rzeki, zidentyfikowano zmienność sezonową zawartości fosforanów w reprezentatywnych punktach obserwacyjnych, główne źródła napływu fosforanów i zidentyfikowano najbardziej zanieczyszczone sekcje rzeki Bug. Na koniec zwrócono uwagę na konieczność przywrócenia i ochrony właściwego stanu ekologicznego rzek transgranicznych.
The article stipulates that one of the primary issues regarding surface waters of Western Bug river, specifically eutrophication, is caused by influx of excessive amount of biogens (which include phosphates).In order to study the dynamics of change of phosphate regime in Western Bug river basin, analysis of phosphate concentrations change alongside river bed has been performed, season-related features of phosphate contents in representative observation points have been determined, main phosphates influx sources and most polluted sections of the river have been identified.Finally, the attention has been focused on the necessity to restore and guard the "good" ecological state of transboundary rivers.
В статье, указано, что причиной одной из основных проблем поверхностных вод р. Западный Буг – эфтрофикации, является поступление избыточного количества биогенов (среди них фосфатов).С целью исследования динамики изменений фосфатного режима в бассейне реки Западный Буг проанализировано изменения концентраций фосфатов по руслу реки, сезонные особенности их содержания в репрезентативных пунктах наблюдения, установлены основные источники его поступления и наиболее загрязнённые участки реки.Как итог, акцентировано внимание на необходимости восстановления и охраны "хорошего" экологического состояния трансграничных рек.
Źródło:
International Journal of New Economics and Social Sciences; 2017, 5(1); 158-167
2450-2146
2451-1064
Pojawia się w:
International Journal of New Economics and Social Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of injection technologies in the device of ground constructions in different geological terms
Zastosowanie technik iniekcyjnych w celu posadowienia konstrukcji w różnych warunkach geologicznych
Autorzy:
Dudlya, N. A.
Popov, A. V.
Telnih, N. N.
Tsaplin, E. G.
Powiązania:
https://bibliotekanauki.pl/articles/300063.pdf
Data publikacji:
2009
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
technologie iniekcyjne
injection technologies
Opis:
A theoretical ground and examples of successful application of injection re-enforcement of soils for the improvement of his uniformity and rise of bearing strength is given in foundation of different buildings.
W artykule omówiono podstawy teoretyczne i przykłady skutecznego zastosowania technologii iniekcyjnych w celu poprawy spójności gruntów oraz podwyższenia ich wytrzymałości dla posadowienia fundamentów budynków.
Źródło:
Wiertnictwo, Nafta, Gaz; 2009, 26, 3; 507-515
1507-0042
Pojawia się w:
Wiertnictwo, Nafta, Gaz
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Spontaneous Terahertz Emission under Electrical Breakdown of a Shallow Acceptor in Ge
Autorzy:
Andrianov, A. V.
Zaharin, A. O.
Yassievich, I. N.
Zinovev, N. N.
Powiązania:
https://bibliotekanauki.pl/articles/2041653.pdf
Data publikacji:
2005-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.67.De
78.60.Fi
07.57.Hm
Opis:
The spectra of spontaneous terahertz (THz) electroluminescence at the breakdown of shallow Ga acceptor in Ge were observed for the first time and investigated. We found and characterized the emission lines corresponding to the hole transitions between the excited states and the ground state of the impurity center as well as the transitions of the hot holes from the valence band to the impurity and within the valence band. A high quantum yield of the radiative transitions will become an important factor in designing electrically pumped THz emitters for the≈2 THz spectral range.
Źródło:
Acta Physica Polonica A; 2005, 107, 1; 142-146
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Self-tapping screw surface gas-phase cementation kinetics investigation, with EPDM washer
Badania kinetyki cementacji z fazy gazowej powierzchni wkrętów samogwintujących z podkładką z EPDM
Autorzy:
Khojibergenov, D. T.
Chmura, D. K.
Zobnin, N. N.
Islamkulov, K. M.
Powiązania:
https://bibliotekanauki.pl/articles/272614.pdf
Data publikacji:
2017
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Inżynierii Materiałów Polimerowych i Barwników
Tematy:
cementation
protective coating
corrosion resistance
self-tapping screw
cementacja
powłoka antykorozyjna
odporność na korozję
wkręty samogwintujące
Opis:
The kinetics of gas-phase cementation of goods – self-tapping metal screws for attachment of metal structures DIN 7982 / ISO 7050 with pointed ends from steels of SAE 1013-1018 to ASTM 510 grades was studied. The investigation was carried out by dynamic method with open volume, renewable gas phase, continuous delivery of natural gas to the flow system and its extraction from gaseous products of interaction. Chemical and phase composition of the surface coating was studied by means of low-vacuum raster electron microscope JSM 6490LV of JEOL company (Japan). A cementation of screws with washer from EPDM was examined. Experimental dependences of carbon concentration on the distance from the goods’ surface for various exposures in the cementation process were received. It was found that hardness of all elements of the hardened goods is notably higher than of the hardened goods. Thread, head and drill, i.e. off set elements of the goods are subjected to the maximum hardening. It was also substantiated that there is substantial decarbonization of the surface coating at a depth of 0.2–0.4 mm depending on the exposure time in the process of traditional hardening heat of the self-tapping screws. This explains lower values of the hardness of the thread, head and drill, the protruding elements of the goods. In comparison with the hardening, the cementation allows raise the hardness of the surface to 64−73 HRC (hardness in Rockwell scale C). Ways to raise corrosion resistance using the cementation were aimed. Among goods with protective coating (galvanized, oxidized) at the initial stage, the case-hardened goods have the lowest weight loss and during the whole time of the experiment the weight loss is substantially lower than the standard values.
Zbadano kinetykę cementacji z fazy gazowej wkrętów samogwintujących do mocowania struktur metalowych DIN 7982/ ISO 7050 z ostrymi końcami ze stali gatunków SAE 1013-1018 do ASTM 510. Niniejsze badanie zostało przeprowadzone za pomocą metody dynamicznej z otwartą objętościowo, odnawialną fazą gazową, ciągłym podawaniem naturalnego gazu do systemu przepływowego oraz jego ekstrakcją z gazowych produktów interakcji. Skład chemiczny i fazowy powłoki powierzchniowej był badany przy pomocy niskopróżniowego, rastrowego mikroskopu elektronowego JSM 6490LV firmy JEOL (Japonia). Zbadano także możliwość wykorzystania cementowanych śrub z nakrętkami, mającymi podkładki uszczelniające oparte na EPDM. Otrzymano doświadczalnie zależność stężenia węgla od odległości od powierzchni wyrobów dla różnych ekspozycji w procesie cementowania. Stwierdzono, że twardość wszystkich elementów wyrobów hartowanych jest istotnie wyższa niż wyrobów hartowanych. Gwint, główka i świderek gwintujący, tj. robocze elementy wyrobów poddawano maksymalnemu hartowaniu. Potwierdzono, że w procesie tradycyjnego hartowania cieplnego wkrętów samogwintujących zachodzi znaczna dekarbonizacja powłoki powierzchniowej na głębokość 0,2–0,4 mm, zależnie od czasu ekspozycji. To wyjaśnia niższe wartości twardości gwintu, główki i świderka gwintującego, zewnętrznych elementów tych wyrobów. W porównaniu z hartowaniem, cementowanie pozwala na podwyższenie twardości powierzchni do 64–73 HRC. Zwrócono uwagę na sposoby podniesienia odporności na korozję przy użyciu cementowania. Spośród wyrobów mających powłokę ochronną (galwanizowanych, oksydowanych) na wstępnym etapie, wyroby hartowane mają najmniejszą utratę masy, a podczas całego eksperymentu utrata masy jest istotnie niższa od standardowych wartości.
Źródło:
Elastomery; 2017, 21, 2; 92-99
1427-3519
Pojawia się w:
Elastomery
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An Analysis of Solar Burst Type II, III, and IV and Determination of a Drift Rate of a Single Type III Solar Burst
Autorzy:
Hamidi, Z. S.
Ibrahim, M. B.
Shariff, N. N. M.
Monstein, C.
Powiązania:
https://bibliotekanauki.pl/articles/411732.pdf
Data publikacji:
2014
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
sun
solar burst
type II,III,IV
radio region
X-ray region
solar flare
active region
Opis:
The main feature of solar radio type II, III and IV burst is outlined. In this event there are three combinations of bursts that related to the solar flare phenomenon on 6th July 2012. This event is one of good example to observe how far the influence of type II burst could impact the formation of type IV burst and III solar bursts. At first stage, it was observed that a sub-type of H burst form within 2 minutes before type IV solar burst form. The type IV burst is due to the eruption of active region AR 1515 with a fine structure (FS). We used a Blein CALLISTO data in this case. Further analysis also showed that the total energy of the burst are in the range of 4.875 × 10-25 J to 8.48 × 10-25 J and plasma frequency is equal to 1.24 × 104 Hz. Therefore, we could say that in this case, before the solar burst type III occurred, the ejection of CMEs already ejected.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2014, 19, 2; 160-170
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Space Weather: The Significance of e-CALLISTO (Malaysia) As One of Contributor of Solar Radio Burst Due To Solar Activity
Autorzy:
Hamidi, Z. S.
Shariff, N. N. M.
Monstein, C.
Ibrahim, Z. A.
Powiązania:
https://bibliotekanauki.pl/articles/411980.pdf
Data publikacji:
2014
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
sun
radio emission
solar radio burst
Compound Astronomical Low-cost Low-frequency Instrument for Spectroscopy in Transportable Observatories (CALLISTO)
solar flares
Coronal Mass Ejections (CMEs)
space weather
Opis:
The impact of solar activities indirectly affected the conditions of earth's climate and space weather in general. In this work, we will highlight a low cost project, however, potentially gives a high impact through a dedicated long-term and one of the most successful space weather project. This research is a part of an initiative of the United Nations together with NASA in order to support developing countries participating in „Western Science‟ research. At the beginning of 2007, the objective to monitor the solar activities (solar flares and Coronal Mass Ejections) within 24 hours all over the world has positively turned to reality. Realize how important for us to keep doing a research about the solar bursts, by using the new radio spectrometer, CALLISTO. This research is not only hoping to give a knowledge to the people about how the solar bursts are produced, the characteristics of every type of solar burst at the wide range (45 MHz to 870 MHz) but also the effect of the solar burst toward the Earth. By using the same CALLISTO spectrometer within the 45-870 MHz, designing and leading by Christian Monstein from ETH Zurich, Switzerland, this research project is the one of successful project under ISWI program. Malaysia becomes the 19th countries that involve this research. One of the advantages to start the solar monitoring in Malaysia is because our strategic location as equator country that makes possible to observing a Sun for 12 hours daily throughout a year. We strongly believe that Malaysia as one of contributor of solar activity data through E-CALLISTO network. This is a very good start for developing a radio astronomy in Malaysia.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2014, 7; 37-44
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Case Study of Explosion A Single Solar Burst Type III and IV Due to Active Region AR1890
Autorzy:
Hamidi, Z. S.
Ibrahim, M. B.
Shariff, N. N. M.
Monstein, C.
Powiązania:
https://bibliotekanauki.pl/articles/412554.pdf
Data publikacji:
2014
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
sun
solar burst
III
IV
radio region
X-ray region
solar flare
active region
Opis:
Using data from a BLEIN Callisto site, we aim to provide a comprehensive description of the synopsis formation and dynamics of a a single solar burst type III and IV event due to active region AR1890. This eruption has started since 14:15 UT with a formation of type III solar burst. To investigate the importance of the role of type III solar burst can potentially form a type IV solar burst, the literature review of both bursts is outlined in detailed. The orientation and position of AR1890 make the explosion of a class C-solar flare is not directly to the Earth. Nevertheless, it is clear that the interactions of others sunspots such as AR1893,AR1895,AR1896, AR1897 and AR1898 should be studied in detail to understand what makes the type III burst formed before the type IV solar burst.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2014, 19, 2; 171-180
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An Analysis of the Electron Density and Drift Rate of Solar Burst Type III During 13th of May 2015
Autorzy:
Ali, M. O.
Hamidi, Z. S.
Shariff, N. N. M.
Monstein, C.
Powiązania:
https://bibliotekanauki.pl/articles/1192997.pdf
Data publikacji:
2016
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Coronal Mass Ejections (CMEs)
Sun
X-ray region
radio region
solar burst
solar flare
type III
Opis:
During 13th of May 2015, the solar wind is very high velocity, which is 733 kms-1 as compared to 367.5 kms-1. It is believed that the plasma–magnetic field interactions in the solar corona can produce suprathermal electron populations over periods from tens of minutes to several hours, and the interactions of wave-particle and wave-wave lead to characteristic fine structures of the emission. An intense and broad solar radio burst type II was recorded by CALLISTO spectrometer from 20-85 MHz. Using data from a the Blein observatory, the complex structure of solar burst type III can also be found in the early stage of the formation of type III solar burst type event due to active region AR 12339. The drift rate of solar burst type III exceeds 1.0 MHz/s with 6.318 x1012 e/m3 a density of electron in the solar corona. There were also 2 groups of solar radio burst type III were observed. This CME was detected at 08:36 UT which is 1and ½ hour after the solar burst detected. This event shows a strong radiation in radio region, but not in X-ray region.
Źródło:
World Scientific News; 2016, 31; 1-11
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An Alternating of Solar Radio Burst Type III and IV of Thermal and Non-Thermal Plasma Radiation
Autorzy:
Hamidi, Z. S.
Husien, Nurul Hazwani
Shariff, N. N. M.
Monstein, C.
Powiązania:
https://bibliotekanauki.pl/articles/1193005.pdf
Data publikacji:
2016
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Sun
burst
low frequency
solar radio
type III
type IV e-CALLISTO
Opis:
A preliminary correlation study of the solar burst type III with a type Iv solar burst of has been made. On the basis of this study and in combination with the observation in radio emission, an interpretation of the mechanism of the occurrence of this event has been proposed. We have noted that an individual type III burst also can be observed at 13:54-13:58 UT from 500 MHz. Based on 3 days observation beginning from 31st March 2015, the solar activity is gradual increased. The highest solar flare can be observed is only a class of M8 flare. There was a CMEs event that directed to the Earth is detected. From the selected event, although theoretically solar radio burst type III is alternating with type IV solar burst. This huge explosion generated the M-class flare which can affect the Earth and satellites. The solar wind velocity recorded is 384.2 km/second while the density of protons is 3.6 protons/cm3. The total magnetic field during this event also quite big which is 4.6nT. The alternating of solar burst type III and IV would probably depends on the tendencies to form the CMEs event. The morphology of thermal and non-thermal flare plasma is of particular significance because it holds many important signatures of the energy release process.
Źródło:
World Scientific News; 2016, 31; 88-99
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Biocenotyczne i technologiczne podstawy selekcji wysoko wydajnych fitocenoz nasiennych rutwicy wschodniej o wieloletnim użytkowaniu
Biocoenotic and technological bases of selection of highly efficient seed phytocoenoses of the eastern Galega of long-term use
Autorzy:
ZoÎotiariev, V. N.
KosoÎapov, V. M.
Liebiedieva, N. N.
Ševcov, A. V.
Powiązania:
https://bibliotekanauki.pl/articles/339362.pdf
Data publikacji:
2011
Wydawca:
Instytut Technologiczno-Przyrodniczy
Tematy:
agrofitocenoza
długowieczność uprawy
normy siewu
plonowanie nasion
rutwica wschodnia (Galega orientalis Lam.)
zagęszczenie runi
agro-phytocoenosis
crop longevity
eastern galega (Galega orientalis Lam.)
seed yielding
sowing standard
sward density
Opis:
Stwierdzono zależność kształtowania plonowania nasion rutwicy wschodniej (Galega orientalis Lam.) od składu fitocenozy, czasu użytkowania runi i warunków hydrotermicznych w okresie wegetacji. Określono dynamikę regulacji procesu samoodnawiania populacji w zależności od zróżnicowania początkowego zagęszczenia roślin rutwicy. Udowodniono wysoki poziom produktywności nasiennych plantacji w ciągu 9 lat ich użytkowania.
Seed yielding in the eastern galega (Galega orientalis Lam.) was found to depend on the composition of phytocoenosis, time of sward utilisation and on hydro-thermal conditions during vegetation. The dynamics of population self-recruitment in relation to the initial plant density was estimated. A high productivity of seed plantations was demonstrated during 9 years of their utilisation.
Źródło:
Woda-Środowisko-Obszary Wiejskie; 2011, 11, 3; 283-292
1642-8145
Pojawia się w:
Woda-Środowisko-Obszary Wiejskie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Дослідження гіполіпідемічних властивостей комплексу бар з чини посівної
Investigation hypolipidemia propety of the bas complex from grades sowing
Autorzy:
Shakhvatova, N.N.
Volkovoy, V.A.
Fomina, G.P.
Beresnykov, A.V.
Powiązania:
https://bibliotekanauki.pl/articles/1032164.pdf
Data publikacji:
2014
Wydawca:
Uniwersytet Kazimierza Wielkiego w Bydgoszczy
Tematy:
atherosclerosis
tba-reactants
asat in serum
qvercetin
complex bas from grades
sowing «latiron»
Opis:
Experimantal reseive indexis peroxidation lipids (level TBA-reactants in serum) and processes cytolysis (action AsAT in serum) which change at atherosclerosis of vessels. Receive results to attest about what plant complex BAS from grades sowing «Latiron» manifest hypolipidemic action in comparison with qvercetin what confirm decrease low density lipoproteins and very low density lipoproteins, increase high density lipoproteins. «Latiron» manifest magnification anticitolityc and antioxidant effect (decrease action AsAT in serum and level TBA-reactants in serum)/
Źródło:
Journal of Health Sciences; 2014, 4, 5; 33-40
1429-9623
Pojawia się w:
Journal of Health Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Development of Long Series of Quasi-Periodic Pulsation in Active Region AR 2297
Autorzy:
Sabri, S. N. U.
Hamidi, Z. S.
Shariff, N. N. M.
Monstein, C.
Powiązania:
https://bibliotekanauki.pl/articles/1194014.pdf
Data publikacji:
2015
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
IV
Sun
X-ray region
active region AR2222
radio region
solar burst
solar flare
Opis:
This phenomena allow us to explore about suprathermal electron population that produced by plasma-magnetic field interactions in the solar corona about tens of minutes.The characteristics of the structures of the emission is influenced by wave-particle interaction and wave-wave interaction. The Callisto spectrometer recorded broadband of solar radio burst Type IV from 250-900 MHz. Using data from BLEN7M observatory, we aim to provide inclusive description about the formation and dynamics of solar radio burst type IV due to active region AR2297. About five minutes, the events revealed strong pulsations and “broad patterns” with details of solar radio burst type III with presence of CMEs. AR2297 is the most active region which produced X2-Class solar flares. The speeds of solar wind exceeds 376.0 km/second with 4.0 g/cm3 density of proton in the solar corona. The radio flux shows 121 SFU. Furthermore, there are two active regions, AR2298 and AR2299 also presents in the X2-class solar flares. Active region AR2297 have unstabe ‘Beta-Gamma-Delta’ magnetic fields thet habor energy for M class to X2- class eruptions. As a conclusion, we conclude that Sun activities are more active to achieve maximum cycle at the end 2015. Solar flares on 11th of March 2015 showed long series of quasi-periodic pulsation that deeply modulate a continuum and its drifting toward lower frequency. The corona extends from the top of a narrow transition region to Earth and has a temperature millions of degrees that still mysterious properties.
Źródło:
World Scientific News; 2015, 9; 59-69
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An Analysis of Antenna Temperature and Radar Cross Section of Log Periodic Dipole Antenna
Autorzy:
Hamidi, Z. S.
Saad, M. Azren Mat
Shariff, N. N. M.
Monstein, C.
Powiązania:
https://bibliotekanauki.pl/articles/1192599.pdf
Data publikacji:
2016
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Sun
Log Periodic Dipole Antenna
type III
radio region
antenna temperature radar cross section
Opis:
The LPDA antenna because it is very suitable and economic amount the types of antennas. It consists of an array of dipoles in which their lengths and spacing are arranged in a log periodic manner, but not all elements in the system are active on a single frequency of operation. The temperature or Antenna Noise Temperature depends on its gain pattern and the thermal environment that it is placed in. We need to design an antenna that can detect the data and monitor the solar burst type III in radio region. It must be sensitive to a broad frequency range and angular distribution of the incident radio pulse and capable to handle the noise issue that is necessary to gain the pure signal. With large instantaneous bandwidths and high spectral resolutions, these instruments will provide increased imaging sensitivity and enable detailed measurements of the dynamic solar burst. For standardized the time, GPS clock is used to control the sampling time of the spectrometer and a tracking controller control the antenna direction. In conclusion, LPDA is the most practical antennas provide general broadband transmission and reception in a wide range of frequency.
Źródło:
World Scientific News; 2016, 55; 126-136
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The zigzag pattern construction of Log Periodic Dipole Antenna Based on Rumsey’s Principle
Autorzy:
Hamidi, Z. S.
Saad, M. Azren Mat
Shariff, N. N. M.
Monstein, C.
Powiązania:
https://bibliotekanauki.pl/articles/1188094.pdf
Data publikacji:
2016
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Log Periodic Dipole Antenna
zigzag pattern
solar burst
radio region
Rumsey’s principle
Opis:
The log-periodic dipole array (LPDA) consist of an array of dipoles in which there have a different lengths and spacing. The wire may be straight or it may be strung back and forth between trees or walls just to get enough wire into the air; this type of antenna sometimes is called a zigzag antenna. Rumsey’s principle requires that the locations of all elements be specified by angles rather than distances, because of this the log periodic dipole array must be correspondingly longer to get very wide bandwidths and gives a very high data rate transmission. The significance of this study is to understand how do the LPDA can be used to monitor solar activities of the sun using the LPDA antenna. The characteristics that need to be considered during construct this antenna is the radiation pattern, polarization, operation of the frequency band, gain and efficiency of an antenna which indicates the power or field strength radiated in any direction relative to that in the direction of maximum radiation. The arrangement of elements in increasing order from the top of the antenna until the bottom part of antenna. Our designed antenna was constructed using aluminum for the further investigation, we can use a copper and check the difference between two of this element. For this study, we just analyzed the source of RFI using this antenna and for the further analysis, we can use this antenna to monitor the solar burst.
Źródło:
World Scientific News; 2016, 56; 146-157
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Relativistic Energy Associated with a Moving Fiber Burst Type μIV Associated with The Class A Solar Prominence
Autorzy:
Hamidi, Z. S.
Norsham, N. A. M.
Shariff, N. N. M.
Monstein, C.
Powiązania:
https://bibliotekanauki.pl/articles/1194133.pdf
Data publikacji:
2016
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Coronal Mass Ejections (CMEs)
Sun
X-ray region
solar burst
solar flare
type IV radio region
Opis:
The relativistic energy electron emission is found to occur only during proton events. Solar prominences usually occur in loop shape and can last for weeks or months. This event allows us to investigate the electron density and drift rate of solar burst type IV During 21st September 2015. During that time the Sun has the highest number of sunspots. The radio sources responsibly for Ivm appear to expand spherically through the solar corona after eject on y solar flare. This event shows a strong radiation in radio region, but not in X-ray region. This burst intense radio phenomena that follow with solar flares. It has a wide band structure from 1412-1428 MHz. It can be considered as an intermediate f drift burst (IMDs). This fiber burst has a negative drift rate where the drift is interpreted by the group velocity of the whistler-mode waves. Their bandwidth is approximately 2% of the emission frequency. The are accompanied a parallel-drift absorption band in the background continuum radiation. The occurrence of the event is interesting in many aspects which is also in ZSIS site. From the dynamic spectra of the CALLISTO, it can be observed that there a moving type IV burst. This burst appears is single SRBT III for approximately 16 minutes at 708UT till 716UT. This burst duration is longer compared to the other events. It can be considered as a Ivμ because it begins at the same time as the explosive phase of solar flare. The solar optical, radio and X-ray emission associated with these various energetic particle emissions as well as the propagation characteristics of each particle species are examined in order to study the particle acceleration and emission mechanisms in a solar flare. At the same time, the number of particles traveled a given path in reconnecting area falls exponentially with increase of this path because of losses owing to a leaving of particles the acceleration volume due to drifts.
Źródło:
World Scientific News; 2016, 57; 11-20
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Medicinskoe znachenie kliniko-ehpidemiologicheskikh i parazitologicheskikh osobennostejj trikhinelleza cheloveka ot sinantropnykh i prirodnykh shtammov prikhinell
Kliniczna, epidemiologiczna i parazytologiczna charakterystyka włośnicy wywołanej przez synantropijne i pochodzące od dzikich zwierząt szczepy Trichinella spiralis
Clinical, epidemiological and parasitological characteristics of human trichinellosis caused by the synanthropic and wild animals strains of Trichinella spiralis
Autorzy:
Ozereckovskaja, N.N.
Tumol'skaja, N.I.
Pereverzeva, E.V.
Ehrmolin, G.A.
Powiązania:
https://bibliotekanauki.pl/articles/2165159.pdf
Data publikacji:
1975
Wydawca:
Polskie Towarzystwo Parazytologiczne
Źródło:
Wiadomości Parazytologiczne; 1975, 21, 4-5; 577-589
0043-5163
Pojawia się w:
Wiadomości Parazytologiczne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Structural disorder of tooth germs in the antenatal period under low doses ionizing radiation exposure in acute experiment
Autorzy:
Cheshko, N. N.
Berlov, H. A.
Pohodenko-Chudakova, I. O.
Gontchar, F. L.
Powiązania:
https://bibliotekanauki.pl/articles/285679.pdf
Data publikacji:
2010
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Tematy:
ionizing radiation
dental system
radiation therapy
Źródło:
Engineering of Biomaterials; 2010, 13, no. 99-101; 9-10
1429-7248
Pojawia się w:
Engineering of Biomaterials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Repairing and strengthening of elliptical paraboloid reinforced concrete shells with openings
Autorzy:
Meleka, N. N.
Safan, M. A.
Bashandy, A. A.
Abd-Elrazek, A. S.
Powiązania:
https://bibliotekanauki.pl/articles/230114.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
powłoka żelbetowa
otwór
naprawa
wzmacnianie
taśma stalowa
zaprawa naprawcza
zaprawa żywiczna
taśma GFRP
reinforced concrete shell
opening
repair
strengthening
steel strip
repair mortar
resinous mortar
GFRP strip
Opis:
This investigation is carried out to evaluate the repair and strengthening the techniques of elliptical paraboloid reinforced concrete shells with openings. An experimental program of several different techniques in repair and strengthening is executed. The materials, which are considered for strengthening, are; Glass fiber reinforced polymers GFRP at different position of the shell bottom surface, steel strip and external tie. They loaded by four concentrated loads affected on the corners of the opening. The initial and failure loads as well as the crack propagation for the tested shells at different loading stages, defl ections and failure load for repaired and shells are recorded. A non-linear computer program based on finite element techniques is used to study the behavior of these types of shells. Geometric and materials nonlinearities are considered in the analysis. The efficiency and accuracy of computer program are verifi ed by comparing the program results with those obtained experimentally for the control shell with opening and strengthened shells.
Źródło:
Archives of Civil Engineering; 2013, 59, 3; 401-420
1230-2945
Pojawia się w:
Archives of Civil Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-100 z 7353

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