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Wyświetlanie 1-15 z 204
Tytuł:
Effect of the height of the delivery water on performance of water ram
Autorzy:
Grygo, D.
Powiązania:
https://bibliotekanauki.pl/articles/298030.pdf
Data publikacji:
2016
Wydawca:
Uniwersytet Warmińsko-Mazurski w Olsztynie
Tematy:
ram water
test stand
equations
performance
Opis:
The main aim of this article is to develop mathematical equations of the performance stream (Vc) of a water ram with regard to the height of water delivery (hc). The study was performed on the sample water ram of my own design mounted on a specially designed test stand. The content of the article is divided into two parts. The first part describes a generalized equation on the base formulae used historically to determine the performance of the water ram. The second part presents the results of research and summarizes the mathematical equations determining the streams performance (Vc) according to the height of water delivery (hc). In conclusion the article makes interpretations of the results. The motivation to approach these issues stems from the question: How much will the performance of the water ram has on the ability to set a receiver tank at different heights?
Źródło:
Technical Sciences / University of Warmia and Mazury in Olsztyn; 2016, 19(2); 139-149
1505-4675
2083-4527
Pojawia się w:
Technical Sciences / University of Warmia and Mazury in Olsztyn
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fluid flow in the impulse valve of a hydraulic ram
Autorzy:
Sobieski, Wojciech
Grygo, Dariusz
Powiązania:
https://bibliotekanauki.pl/articles/950067.pdf
Data publikacji:
2019
Wydawca:
Uniwersytet Warmińsko-Mazurski w Olsztynie
Tematy:
ram pump
drag force
CFD
ANSYS Fluent
Opis:
The paper presents the results of a study investigating the equilibrium of forces acting on the closing element of the impulse valve in a water ram at the end of the acceleration stage. Acceleration is one of the three main stages in the working cycle of a water ram. In the first part of the paper, we estimated water velocity based on our earlier experimental measurements. We also calculated the minimum force required for closing the impulse valve. The second part of the paper discusses two variants of a numerical model, which was developed in ANSYS Fluent to determine the resultant hydrodynamic pressure and, consequently, the forces acting on the head of the impulse valve at the end of the acceleration stage. The main aim of this research was to verify the applicability of numerical modeling in water ram studies. The present study was motivated by the fact that Computational Fluid Dynamics is very rarely applied to water rams. In particular, we have not found any numerical studies related to the equilibrium of forces acting on the closing element of the impulse valve in a water ram.
Źródło:
Technical Sciences / University of Warmia and Mazury in Olsztyn; 2019, 22(3); 205-220
1505-4675
2083-4527
Pojawia się w:
Technical Sciences / University of Warmia and Mazury in Olsztyn
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Integrability theorems for power series
Autorzy:
Ram, Babu
Powiązania:
https://bibliotekanauki.pl/articles/724103.pdf
Data publikacji:
1974
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Źródło:
Colloquium Mathematicum; 1974, 31, 2; 293-299
0010-1354
Pojawia się w:
Colloquium Mathematicum
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Chios ram testicular blood flow and echotexture changes depending on age, season and ejaculation process
Autorzy:
Ntemka, A.
Kiossis, E.
Boscos, C.
Theodoridis, A.
Patsikas, M.
Tsakmakidis, I.
Powiązania:
https://bibliotekanauki.pl/articles/2087128.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Chios breed
ram
ram age
seasonality
testicular blood flow
testicular echotexture
Źródło:
Polish Journal of Veterinary Sciences; 2021, 24, 4; 579-587
1505-1773
Pojawia się w:
Polish Journal of Veterinary Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of multibackground memory testing techniques
Autorzy:
Mrozek, I.
Powiązania:
https://bibliotekanauki.pl/articles/907769.pdf
Data publikacji:
2010
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
testowanie RAM
błąd wzoru
test krokowy
RAM testing
pattern sensitive faults
march tests
multibackground testing
Opis:
March tests are widely used in the process of RAM testing. This family of tests is very efficient in the case of simple faults such as stuck-at or transition faults. In the case of a complex fault model-such as pattern sensitive faults-their efficiency is not sufficient. Therefore we have to use other techniques to increase fault coverage for complex faults. Multibackground memory testing is one of such techniques. In this case a selected March test is run many times. Each time it is run with new initial conditions. One of the conditions which we can change is the initial memory background. In this paper we compare the efficiency of multibackground tests based on four different algorithms of background generation.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2010, 20, 1; 191-205
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
RAM devices in the light of selected provisions of the Act on weapons and ammunition
Autorzy:
Kwasiński, Oskar
Powiązania:
https://bibliotekanauki.pl/articles/1595854.pdf
Data publikacji:
2020
Wydawca:
Uniwersytet Szczeciński. Wydawnictwo Naukowe Uniwersytetu Szczecińskiego
Tematy:
weapon
RAM
real action marker
firearms
ammunition
Opis:
The modern market for personal protection devices has brought about such challenges as the need to phrase legal regulations regarding possession and use of such devices. The aim of the study is to answer the questions whether RAM devices are firearms and whether they are weapons at all within the meaning of the Act of 21 May 1999 on weapons and ammunition. On the way to achieve this goal, a thorough analysis of the translation of the detailed charac- terisation of RAM devices into specific definitions of the Act in question is used. The result of the author’s research is the conclusion that RAM devices are neither weapons nor firearms within the meaning of Polish legislation. Furthermore, the article provides a number of legal consequences resulting from such research conclusions, e.g. no obligation to undergo medi- cal or psychological examinations by a potential RAM device owner.
Źródło:
Acta Iuris Stetinensis; 2020, 29, 1; 87-99
2083-4373
2545-3181
Pojawia się w:
Acta Iuris Stetinensis
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fatigue Degradation of the Ram-Air Parachute Canopy Structure
Autorzy:
Szafran, Krzysztof Stanisław
Kramarski, Ireneusz
Powiązania:
https://bibliotekanauki.pl/articles/98022.pdf
Data publikacji:
2019
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Lotnictwa
Tematy:
parachute systems
aerodynamic decelerator
ram-air canopy
fatigue degradation
aviation safety
Opis:
In this work, the authors continue researching issues related to fatigue of aircraft structures made of fabrics. Parachute systems are widely used in military, sport and recreational aviation. Braking parachutes as well as skydiving and troop parachutes are characterized by the repeated use of parachute canopies, which are exposed to wear and fatigue. Until now, parachutes were difficult to design aviation systems due to their complex and unsteady opening characteristics, large changes in the geometry of canopies, suspension lines and tape risers as well as exposure to stochastic atmospheric turbulence. The fatigue of the canopy fabric, suspension lines and tape risers is a problem that must be addressed by textile designers and designers of reusable parachute systems. The authors of this work demonstrate the complexity of operating a parachute in hard multiple use conditions and propose ways to extend the parachute’s service life without compromising safety.
Źródło:
Fatigue of Aircraft Structures; 2019, 11; 103-112
2081-7738
2300-7591
Pojawia się w:
Fatigue of Aircraft Structures
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
XRF analysis of Pongamia pinnata stem of semi arid region of Kachchh
Autorzy:
Ram, V.R.
Patel, M.G.
Ram, P.N.
Khatri, T.T.
Dave, P.N.
Powiązania:
https://bibliotekanauki.pl/articles/11000.pdf
Data publikacji:
2015
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Opis:
The objective of the present investigation was to study the chemical composition of stem of Pongamia pinnata is a species of tree native to India growing in semi-arid region of Kachchh district, Gujarat, India. The stem of Pongamia pinnata were subjected to Energy Dispersive X-ray Fluorescence (EDXRF) and were analyzed for different mineral composition. As the X-ray Fluorescence is one of the most reliable and accurate, as well as it is also a consistent and nondestructive method for analysis of major and trace elements using a single pressed pellet. During the study it was found that Potassium, Chloride, Calcium, Silicon, Sulfur, Aluminum, Phosphorus were noted in higher amounts, compared to that of other elements like Manganese, Iron, Nickel, Copper, Zink, Bromide, Rubidium, Strontium, Stannous, whereas the elements which were not detected in stem of Pongamia pinnata are Titanium, Cobalt, Hafnium and Tantalum.
Źródło:
International Letters of Natural Sciences; 2015, 40
2300-9675
Pojawia się w:
International Letters of Natural Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The quality and fertilizing ability of the ram semen cryopreserved around 40 years ago
Autorzy:
Gogol, P.
Powiązania:
https://bibliotekanauki.pl/articles/16647392.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
ram semen
ex situ storage
gene banks
cryopreservation
sperm quality
fertility
Opis:
The aim of the study was to verify the quality of ram semen, frozen in 1982-1983, from the historical collection of the Bank of Biological Material of the National Research Institute of Animal Production. A total of 18 ejaculates from 3 Świniarka type rams were analyzed to assess sperm motility (subjectively), total motility, progressive motility, sperm concentration (CASA), membrane integrity (SYBR-14/PI) and chromatin structure (SCSA). In order to determine sperm fertilizing ability 49 ewes were intracervically inseminated (200×106 sperm per AI) with frozen- thawed semen 12 and 24 hours after detection of estrus. Sperm motility parameters, membrane intact spermatozoa and DFI did not differ among the analyzed rams. Spermatozoa concentration was significantly higher for ram no. 2 than for rams no. 1 and 3. The lambing rates (27.3 to 36.0%) did not differ significantly for individual rams. The ram semen, which had been stored for around 40 years, showed satisfactory quality and fertilizing capacity, allowing for its use in artificial insemination.
Źródło:
Polish Journal of Veterinary Sciences; 2022, 25, 4; 631-633
1505-1773
Pojawia się w:
Polish Journal of Veterinary Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study of Anticoagulant Dabigatran by Analytical Instrumentation
Autorzy:
Patel, B.
Ram, P.
Khatri, T.
Ram, V
Dave, P.
Powiązania:
https://bibliotekanauki.pl/articles/412564.pdf
Data publikacji:
2014
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Dabigatran
UPLC/MS/MS
zeta potential
FTIR
UV-NIR
Thermal analysis
Opis:
Dabigatran with IUPAC name 3-({2-[(4-Carbamimidoyl-phenylamino)-methyl]-1-methyl-1H-benzoimidazole-5-carbonyl}-pyridin-2-yl-amino)-propionic acid, which can be used to prevent strokes in those with atrial fibrillation due to causes other than heart valve disease, and at least one additional risk factor for stroke (congestive heart failure, hypertension, age, diabetes, and prior stroke), with molecular formula C34H41N7H5 was studied in detail for functional group analysis with FTIR, characteristic absorbance by UV-NIR, thermal behavior by TGA-DTA-DSC, particle size and stability of the molecule with Nano particle size analyzer. The structure was confirmed by LC-MS/MS with ESI probe and mass was found in aggregation with the reported standard values. The purity of drug was determined by Prep. HPLC analysis. FTIR analysis showed the characteristic peak of carboxylic acid, UV-NIR analysis showed that the λmax was 224 nm with methanol as a diluent, the compound was found stable in the thermal analysis, the average particle size was found to be 25.2 nm, Z-average as 0.2 nm and zeta potential as -67.6 mv hence showed excellent stability in the zeta potential analysis as per ASTM standards D4187-82, American Society of Testing and Materials, 1985.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2014, 11, 3; 233-242
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thermal analytical characteristics by TGA-DTA-DSC analysis of Carica papaya leaves from Kachchh
Autorzy:
Ram, V.R.
Ram, P.N.
Khatri, T.T.
Vyas, S.J.
Dave, P.N.
Powiązania:
https://bibliotekanauki.pl/articles/11265.pdf
Data publikacji:
2014
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Opis:
An experimental study on Carica papaya leaves was carried out in Thermo gravimetric analyzer (TGA), Differential Thermal Analyzer (DTA) and Differential Scanning Calorimetric (DSC) analyzer to investigate the effects of reaction atmosphere on thermal chemical characteristics. Experimental results show that In DSC curve, Endothermic peak at 101 °C is attributed to dehydration/Water loss from surface and pores of the powder sample. Step at 215 °C is associated with second order phase transition such as Glass Transition and it should be further confirmed in second heating (During heat- cool- heat cycle). Endothermic peak at 336 °C is associated protease thermal decomposition /Beta Cyclodextrin breakdown. In the TGA Curve, The initial 4 % weight loss is due to water loss from surface/pores of powder sample. Second weight loss between 200-450 °C is associated to degradation of cellulose and hemicellulose.
Źródło:
International Letters of Natural Sciences; 2014, 21
2300-9675
Pojawia się w:
International Letters of Natural Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 204

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