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Modeling of Sodium Sulfur Battery for Power System Applications
Zahrul F. Hussien,Lee W. Cheung,Mohd F. M. Siam,Amir B. Ismail
Elektrika : Journal of Electrical Engineering , 2007,
Abstract: Sodium sulfur battery is an advanced secondary battery that is relatively new in power system applications. This paper presents the modeling and simulation of sodium sulfur battery used in power system applications such as for battery energy storage system and power quality custom devices. Several electrical battery models are reviewed and important factors to be considered in modeling the battery such as internal resistance, temperature effect, electromotive force and depth of discharge are discussed. Based on the available empirical data, the voltage-current behavior and characteristics of NAS battery are modeled in PSCAD/EMTDC software tool. The model is then used in simulation studies of power system applications utilizing NAS batteries.
Modeling the Influence of Climate Factors on Malaria Transmission Dynamics in North Kordofan State, Sudan  [PDF]
Hamid H. Hussien
Advances in Infectious Diseases (AID) , 2020, DOI: 10.4236/aid.2020.105017
Abstract: Background: Despite great efforts by the government to control malaria in Sudan, the disease is the most significant human disease and was widespread in North Kordofan State. Morbidity and mortality of the disease are increasing in the State. Usually, the disease reached its peak after rainy season. This study aims to estimate the role of climate factors on malaria transmission dynamic by modeling the relationship between malaria cases and climatic variables, such as rainfall, relative humidity, and temperature, in Kordofan State. Methods: We used Pearson correlation coefficient and an ordinary least square method to assess this relationship. Results: The results show that there are statistically significant associations between malaria cases and rainfall, relative humidity, and minimum temperature (P-value < 0.001). The regression analysis results suggest that the appropriate model for predicting malaria incidence includes malaria cases lagged by one month, maximum temperature, and minimum temperature. This model explained 72% of the variance in monthly malaria incidence. Conclusion: The results of this study suggest that climatic factors have potential use for malaria prediction in the State.
Epidemiological Descriptive Analysis of Disease Outbreaks in 2019 in Sudan  [PDF]
Hamid H. Hussien
Open Journal of Epidemiology (OJEpi) , 2020, DOI: 10.4236/ojepi.2020.104033
Abstract: Background: Sudan has often faced outbreaks of malaria, the life-threatening waterborne disease. In 2019, the country experienced an outbreak of six different infectious diseases, i.e., cholera, chikungunya, dengue fever, diphtheria, malaria, and Rift Valley fever. Objectives: The aim of this study was to perform an epidemiological descriptive analysis of data of these disease outbreaks to determine the spatial and temporal patterns of outbreaks and to estimate the magnitude of the diseases. Methods: The data consisted of the number of cases and deaths due to disease outbreaks of cholera, chikungunya, dengue fever, diphtheria, malaria, and Rift Valley fever. We analyzed the reports of an investigation conducted by the World Health Organization and the Federal Ministry of Health, Sudan. Descriptive statistics and case fatality rate (CFR) were used in this study. Results: The frequency of disease occurrence was as follows: cholera (344 cases), chikungunya (308 cases), dengue fever (4236 cases), diphtheria (105 cases), malaria (5,188,135 cases) and River Valley fever (567 cases). The CFRs for cholera, chikungunya, are diphtheria were 4.3%, 2.05%, and 9.5%, respectively. The mortality rate of malaria was 0.0013. The states most affected by outbreaks of these diseases in Sudan were the western states. Women were at a higher risk for all diseases, except River Valley fever. Conclusions: This study highlights the patterns of the outbreak of these diseases in Sudan and provides a basis for future scientific research.
PELAKSANAAN MANAJEMEN PERSONLIA SEKOLAH DI SMA DARUL ULUM 2 BPPT JOMBANG
Muhamad Zaki, M Zahrul Jihad
Dirāsāt: Jurnal Manajemen dan Pendidikan Islam , 2016, DOI: -
Abstract: This article discusses the implementation of personnel management of school in one of the best high schools in Jombang, namely SMA Darul Ulum 2 BTTP Jombang located inside the Pondok Pesantren Darul Ulum Jombang. SMA Darul Ulum 2 BTTP Jombang is one of the schools that are relevant to the issue of personnel management. Because of it’s pesantren background, the curriculum applied in SMA Darul Ulum 2 BPPT Jombang is not separated from the world of pesantren. This can be considered as a national curriculum development, especially on the subjects of Islamic Education. Two different colors but can be lumped together. It is characteristic of the SMA Darul Ulum 2 BTTP Jombang that may not be found in other reguler schools. Thus, the researcher intend to conduct studies and research related to how the personnel management at SMA Darul Ulum 2 BPPT Jombang located inside Pondok Pesantren Darul Ulum Jombang, East Java, Indonesia.
The Effectiveness of a proposed system Based on desktop virtual reality to promote the basic concepts of Computer security
A F Elgamal,M Eldesoky,N Abdelmohsen,M Hussien
International Journal of Computer Technology and Applications , 2012,
Abstract: Teaching information security faces a lot of problems because, it has many abstract concepts which are difficult to understand and imagine in the traditional methods of teaching. In this paper, we have designed a proposed system based on desktop virtual reality to promote the basic concepts of computer security using animated visualization 3D objects. That helps students to understand and simulate. The study was conducted to observe the effectiveness of the proposed system. The students were randomly assigned to experimental and control groups. Computer security concepts were taught via the proposed system in the experimental, and via the traditional lecture method in the control group. The statistical analysis of the students’ results showed that the experimental group had a significantly greater increase in academic’s achievement than the control group. It was conducted that the system had been significantly beneficial on student’s learning.
Enhanced Thermal Stability of Promising Nano-Porous Silicon Powder  [PDF]
Marwa Nabil, Hussien A. Motaweh
Advances in Nanoparticles (ANP) , 2016, DOI: 10.4236/anp.2016.54021
Abstract:
A direct synthesis method is introduced to prepare nano-porous silicon-nickel nanocomposite (nPS/Ni) powder for thermal isolation applications. In this paper, we study the thermal stability of nanocomposites consisting of nanoparticles metal incorporated into the pores of a porous silicon by a very simple method. The nickel element is chemically deposited whereas the nanoparticles are precipitated on the pore surfaces. The (nPS) and (nPS/Ni) nano-materials are thermally measured under nitrogen at temperatures of 40℃ - 1000℃, noticeable, demonstrating better thermal stability of (nPS/Ni) until 900℃ than in the case of (nPS) at 600℃. Then, the improving of the thermal stability of the nPS powder is facilitated using it in many applications of the thermal insulation process.
Shape Control of Silica Powder Formation  [PDF]
Marwa Nabil, Hussien A. Motaweh
Journal of Materials Science and Chemical Engineering (MSCE) , 2019, DOI: 10.4236/msce.2019.73004
Abstract: The purpose of the present research is the different morphologies production of crystalline and amorphous-silica powder. It’s a basic material for many pharmaceutical and environmental applications as well. And, it’s produced using the combination of the alkali chemical etching process and the ultra-sonication technique. The critical preparation conditions are KOH concentration (weight %) and the sonication time (hour). The paper presents the chemical mechanism of the silica particle formation as well as the different morphology. The results show the formation of crystalline and amorphous-porous-silica particles in the micrometer range with the porous order network that has pore sizes range in micrometer too. This synthetic uses commercial silicon, which could be useful for large-scale production. Also, the nano-sphere and nano-cubic shapes of silica powder are formed starting by commercial silicon powder.
Chemical Kinetics for Synthesis of Triacetin from Biodiesel Byproduct
Zahrul Mufrodi,Sutijan, Rochmadi,Arief Budiman
International Journal of Chemistry , 2012, DOI: 10.5539/ijc.v4n2p101
Abstract: The reaction kinetic of the glycerol acetylation with acetic acid catalyzed by sulfuric acid has been studied in the frame of continuous triacetin production. Glycerol, acetic acid and sulfuric acid catalyst were reacted in a batch reactor, in order to get reaction kinetics data. The mole ratio of catalyst to glycerol and temperature were studied during the experience. This study concluded that the selectivity of triacetin increased with increase in mole ratio of catalyst to glycerol. Increasing temperatures lead to increase selectivity of triacetin. It will decreased at the time of acetic acid has begun to evaporate. Triacetin synthesis is an exothermic reaction, a higher reaction temperature will cause in shifting the balance toward formation of reactants. This needs to be anticipated by taking one of the products so that the equilibrium shifting toward product formation.
Overweight and Obesity Among Primary School Children in Misurata City-Libya: Prevalence and Associated Risk Factors
Hussien AE
- , 2018, DOI: http://dx.doi.org/10.19070/2572-7354-1800020
Abstract: Obesity is currently an escalating epidemic that affects many countries in the world where this condition is responsible for increasing death rates annually. This study was performed to find out the prevalence of overweight and obesity and associated risk factors in primary school children in Misurata city, Libya. Height and weight were measured in a sample of 1000 child aged between 6-11 years. Body mass index (BMI) was calculated for each child. Children were categorized according to age and specific percentile of BMI using 2000 CDC BMI - age growth charts. Information on possible risk factors was collected by questionnaire. The results showed that the prevalence of overweight and obesity 15.8% and 12.4% respectively. Viewing TV more than 2 hrs/day, physical exercise, child order and parent obesity were associated with overweight and obesity. In conclusion, prevalence of overweight and obesity primary school children in Misurata, Libya is high and aggressive preventive strategies should be implemented
Reactions with Hydrazonoyl Halides. 31. Synthesis of Some New Pyrrolidino[3,4-c]pyrazolines, Pyrazoles, and Pyrazolo[3,4-d]pyridazines
Abdou O. Abdelhamid,Hussien F. Zohdi,Mohamed M. M. Sallam,Nagla A. Ahmed
Molecules , 2000, DOI: 10.3390/50700967
Abstract: Pyrrolidino[3,4-c]pyrazoline and pyrazole derivatives were synthesized via reactions of a substituted hydrazonoyl bromide with N-arylmaleimides and active methylene reagents, respectively. Synthesized pyrazoles were reacted with hydrazine hydrate to give the corresponding pyrazolo[3,4-d]pyridazines.
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