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Tytuł:
Maritime Education – Putting in the Right Emphasis
Autorzy:
Ali, A.
Powiązania:
https://bibliotekanauki.pl/articles/116524.pdf
Data publikacji:
2009
Wydawca:
Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Tematy:
Maritime Education
Maritime Education and Training (MET)
Merchant Marine
Maritime Cluster
MET System in Australia
MET System in UK
MET System in Pakistan
Opis:
Education is the first step towards the effective and efficient utilization of the available resources. Same is the case with maritime sector and industry. Our maritime cluster is handicapped with respect to the educational needs and their fulfillment. We need to come up with institutions of world ranking for maritime education. Whether it is port sector or shipping industry, coastal zone development or environment protection, what we need is to have means to educate our people for all tiers and types of organizations in maritime domain.
Źródło:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2009, 3, 2; 233-236
2083-6473
2083-6481
Pojawia się w:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Role and Importance of Simulator Instructor
Autorzy:
Ali, A.
Powiązania:
https://bibliotekanauki.pl/articles/117417.pdf
Data publikacji:
2008
Wydawca:
Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Tematy:
Maritime Education and Training (MET)
Simulator Instructor
Seafarers Training
Simulator Based Training (SBT)
Ship Experiences
MET Facilities
Training Value of Simulators
IMO Model Course
Opis:
Traditional concept of seafarers’ training was based upon theoretical teaching in class room followed by the practical training onboard ship. This concept underwent profound changes in 80s due economic and practical reasons emanating from new face of the marine industry. Simulator based training had obvious advantages of being economical, safe and redundant. But it had its own implications as well. How perfect a simulator may be, it still was far away from real ship experiences. Instructor became more and more important and he is actually responsible to connect up the simulator experience with real ship experiences through his visualization and does not let the trainee get into a discourse or fall into a game mood. This study examines how the importance of simulator instructor is on the rise and present tools available for the qualification of the simulator instructors need to be augmented with new measures so as to ensure the quality of the simulator based training of the seafarers.
Źródło:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2008, 2, 4; 423-427
2083-6473
2083-6481
Pojawia się w:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Performance Analysis of WDM-FSO Link under Turbulence Channel
Autorzy:
Mazin, Ali A. Ali
Powiązania:
https://bibliotekanauki.pl/articles/1192036.pdf
Data publikacji:
2016
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
free space optics
BER
Atmospheric Turbulence
NRZ format
RZ technique
Opis:
In this paper, the performance analysis of FSO communication link in various atmospheric turbulence has been analysis for different bit rate using NRZ and RZ technique. The effect of turbulence on the link performance has been investigated by varying bit rate, turbulence strength and modulation format. FSO performance carried out for BER, Q. factor, received power under maximum link. Simulation results show that RZ format is best for strong turbulence. Where NRZ technique is used for low and medium turbulence.
Źródło:
World Scientific News; 2016, 50; 160-173
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ergasilus boleophthalmi sp. n. (Copepoda: Ergasilidae) parasitic on gobiid fishes from Shatt Al-Basrah Canal, South of Iraq
Autorzy:
Adday, T.
Ali, A.
Powiązania:
https://bibliotekanauki.pl/articles/840611.pdf
Data publikacji:
2011
Wydawca:
Polskie Towarzystwo Parazytologiczne
Tematy:
Ergasilus boleophthalmi
Copepoda
Ergasilidae
parasite
gobiid fish
Shatt Al-Basrah Canal
Iraq
animal parasite
Gobiidae
Boleophthalmus dussumieri
Bathygobius fuscus
mudskipper
dusky frillgoby
fish
new species
Źródło:
Annals of Parasitology; 2011, 57, 3
0043-5163
Pojawia się w:
Annals of Parasitology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Performance analysis of terrestrial WDM-FSO Link under Different Weather Channel
Autorzy:
Mazin, Ali A. Ali
Powiązania:
https://bibliotekanauki.pl/articles/1188080.pdf
Data publikacji:
2016
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
WDM
FSO
optical communication
non return to zero
weather attenuation
Opis:
In this paper, the performance of WDM-FSO communications system is simulation analyzed, using NRZ modulation technique over different weather conditions. Based on this technique the received signal power, signal to noise ratio, Q. factor, and BER are analyzed. The characteristics of WDM was studied for free space optical communication. Simulation results indicate that the performance of WDM-FSO are more suited for strong attenuation. On the other hand, the suitability of distance link under this technique are studied, where WDM has more advantage when used in optical communication system.
Źródło:
World Scientific News; 2016, 56; 33-44
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Transmitter Inclination Angle Characteristics for Underwater Optical Wireless Communication in a Variety of APD Detectors
Autorzy:
Mazin, Ali A. Ali
Powiązania:
https://bibliotekanauki.pl/articles/1192197.pdf
Data publikacji:
2016
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Communications
Underwater Optical Communications
Avalanche Photodiode
Bit Error Rate
Channel Capacity
Opis:
In this paper, the performance of an underwater optical wireless communications system is theoretically analyzed, using 4-PPM modulation technique and an avalanche photodiodes APD receiver over underwater environment channels. Based on the line of sight (LOS) geometrical model for optical beam propagation horizontally on an underwater medium and combined with signal to noise ratio model for Si, Ge and InGaAs APD and BER; then the impacts of the distance of transmission, power of the transmitter under Jerlov water types (I, IA, IB) are analyzed. The characteristics of bit error rate BER and channel capacity for 4-PPM optical modulation technique are studied under different APD detector and Jerlov water types. Simulation results indicate that the performance of PPM and Jerlov type (I) are more suited for an underwater optical wireless communication. On the other hand, we discuss the suitability of avalanche photodiodes under this modulation technique, where the photodiode Si APD has more advantage compared with the other detectors when used as a receiver in an underwater optical communication.
Źródło:
World Scientific News; 2016, 45, 2; 355-372
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of dimensional stability of recycled plastic material obtained by grinding
Analiza stabilności wymiarowej produktu rozdrabniania w recyklingu tworzyw
Autorzy:
Al-Zubiedy, Ali A.
Powiązania:
https://bibliotekanauki.pl/articles/947136.pdf
Data publikacji:
2019
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Chemii Przemysłowej
Tematy:
grinding process
recycling of polymer materials
proces rozdrabniania
recykling tworzyw polimerowych
Opis:
A study to identify the products of grinding process for the purposes of the recycling of elements, installations and materials made from polymers was proposed. The ground material was analyzed, evaluated and then described using the latest granulometric models. Based on the stability models, a mathematical description of granulometric distribution of particle size of the recycled polymer products obtained in the grinding process was found.
Dla potrzeb recyrkulacji elementów, instalacjii materiałów z tworzyw polimerowych zaproponowano badania identyfikujące produkty rozdrabniania. Analizowano, oceniano, a następnie opisano je na bazie najnowszych modeli granulometrycznych. Modele stabilności pozwoliły na znalezienie matematycznych opisów rozkładów granulometrycznych uzyskanych produktów rozdrabniania w procesie recyklingu tworzyw polimerowych.
Źródło:
Polimery; 2019, 64, 5; 361-368
0032-2725
Pojawia się w:
Polimery
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ergasilus boleophthalmi sp. n. (Copepoda: Ergasilidae) parasitic on gobiid fishes from Shatt Al-Basrah Canal, South of Iraq
Autorzy:
Adday, T.
Ali, A.
Powiązania:
https://bibliotekanauki.pl/articles/2143376.pdf
Data publikacji:
2011
Wydawca:
Polskie Towarzystwo Parazytologiczne
Tematy:
Ergasilus boleophthalmi
Copepoda
Ergasilidae
parasite
gobiid fish
Shatt Al-Basrah Canal
Iraq
animal parasite
Gobiidae
Boleophthalmus dussumieri
Bathygobius fuscus
mudskipper
dusky frillgoby
fish
new species
Opis:
A new species of Ergasilus von Nordmann, 1832 (Copepoda: Ergasilidae) parasitic on the gills of two gobiid fishes Boleophthalmus dussumieri Valenciennes and Bathygobius fuscus (Rüppell, 1930) from Shatt Al-Basrah Canal, Iraq, is described. The new species differs from all its congeners by a combination of character states including the shape of the body, and the structure and armature of the swimming legs.
Źródło:
Wiadomości Parazytologiczne; 2011, 57, 3; 137-142
0043-5163
Pojawia się w:
Wiadomości Parazytologiczne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Spectroscopic Investigation of the Hair of Diabetic Patients
Autorzy:
Ali, A.
Verma, N.V.
Powiązania:
https://bibliotekanauki.pl/articles/412256.pdf
Data publikacji:
2013
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
diabetes
metals
hair
AAS
Opis:
Diabetes is a major disease condition that is accountable for 5% of annual cause of death globally and it continues to escalate. In this research the levels of minerals in persons with type 2 diabetes were investigated using hair as the biopsy specimen. The philosophy behind is that minerals are involved in countless metabolic functions in all phases of the life process, an imbalance of which can have widespread implication, while hair due to its physiology serves an invaluable record of the body's exposure to minerals. Hair metal testing is a fascinating new diagnostic tool and often gives unexpected clues to mineral imbalances in the body. In executing the research samples of head hair collected from 6 type 2 diabetic patients were washed to remove exogenous contaminants, then subjected to open vessel acid digestion and subsequent analysis for the elements Ca, Cd, Cr, Cu Fe, K, Mg, Na and Zn using Flame Atomic Absorption Spectroscopy (FLAAS). After comparing the concentration of the elements to a range that is considered to be normal it was found that Ca, Zn, Fe, Mg, K, Cu, Cd and Cr were off range while Na was normal. Upon investigating the function and effects of the elements that were off range it was found that a deficiency of chromium and an excess of iron could be a possible cause of diabetes.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2013, 3; 37-45
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The effect of rheology with gas bubbles on linear elastic waves in fluid-saturated granular media
Autorzy:
ALI, A. A.
Strunin, D. V.
Powiązania:
https://bibliotekanauki.pl/articles/265018.pdf
Data publikacji:
2018
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
reologia
materiały porowate
pęcherzyki
Frenkel-Biots waves
bubbles
rheology
porous media
Opis:
Elastic waves in fluid-saturated granular media depend on the grain rheology, which can be complicated by the presence of gas bubbles. We investigated the effect of the bubble dynamics and their role in rheological scheme, on the linear Frenkel-Biot waves of P1 type. For the wave with the bubbles the scheme consists of three segments representing the solid continuum, fluid continuum and bubbles surrounded by the fluid. We derived the Nikolaevskiy-type equation describing the velocity of the solid matrix in the moving reference system. The equation is linearized to yield the decay rate λ as a function of the wave number k. We compared the λ (k) -dependence for the cases with and without the bubbles, using typical values of the input mechanical parameters. For both the cases, the λ(k) curve lies entirely below zero, which implies a global decay of the wave. We found that the increase of the radius of the bubbles leads to a faster decay, while the increase in the number of the bubbles leads to slower decay of the wave.
Źródło:
International Journal of Applied Mechanics and Engineering; 2018, 23, 3; 575-594
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Deforestation and its impacts on climate change an overview of Pakistan
Autorzy:
Ali, A.
Riaz, S.
Iqbal, S.
Powiązania:
https://bibliotekanauki.pl/articles/11968.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
climate change
deforestation
Pakistan
catastrophic event
forest age
natural factor
weather
industrialization
urbanization
global temperature
surface temperature
disaster
South Asia
Opis:
Forests are one the main natural factors that regulate and determine climate, weather patterns and amount of CO2 of an area. With rapid industrialization and rapid urbanization there is a significant increase in deforestation and as a consequence rise in global mean surface temperatures. Rapid and unchecked cut down of forest cover has resulted in some of the worst disasters during the last decades. This paper focuses on studying the role of deforestation, its influence on climate change phenomena and its consequences in Pakistan.
Źródło:
Papers on Global Change; 2014, 21
2300-8121
1730-802X
Pojawia się w:
Papers on Global Change
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Solar Hot Water Heating and Electricity Generation Using PV/T Hybrid System
Autorzy:
Badran, Ali A.
Obeidat, Firas A.
Powiązania:
https://bibliotekanauki.pl/articles/2086426.pdf
Data publikacji:
2022
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
solar energy system
water heating system
PV module
flat plate solar collector
Opis:
Experimental work has been carried out to study the possibility of combining a conventional solar water collector with a hybrid device, developed previously and known as PV/T system, in order to obtain hot water with temperature above 40 °C. The effect of the combination on the productivity of hot water and the produced electricity was found. The formerly developed device, in which there was a multi-purpose solar collector, can produce hot water and electricity. It was connected to the conventional fin-tube collector in series in order to raise the product temperature to a higher level. This development was achieved for the first time as a combination between a PV/T and a conventional fin-tube collector. Instrumentation to measure temperatures, solar radiation, wind speed and flow rate was installed on the system. It was found that the water temperature was raised from 29 °C to 32 °C in the PV/T collector system and, after flowing through the conventional collector, it was raised to 50 °C and above. It was also found that the power efficiency in the case of water flow is always higher than in the case of no water flow.
Źródło:
Journal of Ecological Engineering; 2022, 23, 5; 196--206
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Assessment of construction workers’ hydration status using urine specific gravity
Autorzy:
Montazer, Saideh
Farshad, Ali A.
Monazzam, Mohammad R.
Eyvazlou, Meysam
Yaraghi, Ali A.
Mirkazemi, Roksana
Powiązania:
https://bibliotekanauki.pl/articles/2179079.pdf
Data publikacji:
2013-10-01
Wydawca:
Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi
Tematy:
thermal stress
dehydration
USG
TWL
Opis:
Objectives: The study objective was to assess hydration status by measuring USG among construction workers in Iran. Materials and Methods: The study design was comparative and experimental. Sixty participants were randomly selected from the construction workers from a construction campus with a similar type of work, climate and diet and formed 2 groups (individuals exposed to the sun and non-exposed individuals). TWL and USG were measured in both groups on 2 consequent days, at the beginning, mid and end of the work shift. Results: USG test showed that mean USG was 1.0213±0.0054 in the control group and in the exposed group, where it was significantly higher, it amounted to 1.026±0.005. In the exposed group, 38% of workers had a USG level between 1.026-1.030, representing a higher risk of heat illness and impaired performance and 12.72% had a USG level above 1.030 representing a clinically dehydrated status, while this proportion in the control group was 15.2% and 0.58%, respectively. The mean TWL index measure was 215.8±5.2 W/m² for the control group and 144±9.8 W/m² for the exposed group, where, again, it was significantly higher. The Pearson correlation measure showed a significant correlation between USG and TWL. Conclusions: Strong correlation between TWL, as an indicator of thermal stress and USG shows that USG can be considered as a predictor of thermal stress. The difference between USG among the exposed and non-exposed workers and the increase in USG during midday work show the sensitivity of this measure in different thermal and climatic conditions, whereas, the high level of dehydration among workers despite acceptable TWL level, shows that heat stress management without considering the real hydration status of workers, is insufficient.
Źródło:
International Journal of Occupational Medicine and Environmental Health; 2013, 26, 5; 762-769
1232-1087
1896-494X
Pojawia się w:
International Journal of Occupational Medicine and Environmental Health
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Jiroft refractory manganese ore leaching using oxalic acid as reducing agent in sulfuric acid solution
Autorzy:
Sobouti, Arash
Shafaat, Niosha
Abdollahzadeh, Ali A.
Powiązania:
https://bibliotekanauki.pl/articles/110395.pdf
Data publikacji:
2020
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
manganese
oxalic acid
sulfuric acid
leaching
optimization
Jiroft
Opis:
Leaching process of Jiroft refractory manganese ore was investigated. The effects of operating parameters such as liquid to solid ratio, pulp temperature, sulfuric acid concentration, and oxalic acid concentration were studied and the optimization was done through the response surface methodology (RSM) based on central composite design (CCD) model. The recoveries of Mn, Fe and Si were selected as response of design. The optimum condition was determined by ANOVA, indicating that the liquid to solid ratio, oxalic acid concentration and pulp temperature for Mn recovery and liquid to solid ratio, pulp temperature and sulfuric acid concentration for Fe recovery and liquid to solid ratio for Si recovery were the most effective parameters, respectively. Under the optimum conditions of liquid to solid ratio= 11.8%, pulp temperature= 700 C, sulfuric acid concentration= 40 g/L and oxalic acid concentration= 35 g/L, 71.1%, 4.67% and 0.6% of Mn, Fe and Si were recovered, respectively.
Źródło:
Physicochemical Problems of Mineral Processing; 2020, 56, 2; 374-385
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Frequency Offset Compensation for OFDM Systems Using a Combined Autocorrelation and Wiener Filtering Scheme
Autorzy:
Ramadan Ali, A.
Khanzada, T. J.
Omar, A.
Powiązania:
https://bibliotekanauki.pl/articles/308065.pdf
Data publikacji:
2010
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
channel characterization
frequency offset
OFDM measurement
Wiener filtering
Opis:
One of the orthogonal frequency division multiplexing (OFDM) system disadvantages is its sensitivity to frequency offset and phase noise, which lead to losing the orthogonality between the subcarriers and thereby degrade the system performance. In this paper a joint scheme for frequency offset and pilot-based channel estimation is introduced in which the frequency offset is first estimated using an autocorrelation method, and then is fined further by applying an iterative phase correction by means of pilot-based Wiener filtering method. In order to verify the capability of the estimation algorithm, the scheme has been implemented and tested using a real measurement system in a multipath indoor environment. The results show the algorithm capability of compensating for the frequency offset with different transmission and channel conditions.
Źródło:
Journal of Telecommunications and Information Technology; 2010, 1; 40-47
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
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