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Search Results: 1 - 10 of 138 matches for " Allajabu Dafalla Khamis "
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Security Framework for Distributed Database System  [PDF]
Allajabu Dafalla Khamis, Saad Subair
Journal of Data Analysis and Information Processing (JDAIP) , 2019, DOI: 10.4236/jdaip.2019.71001
Abstract: This research aims to study various Symmetrical Algorithms, while the main objective of this study is to find out a suitable algorithm for the encryption of any specific size of text file where the experiment of each algorithm is based on encryption of different sizes of the text files, which are in “10 KB to 5 MB”, and also to calculate the time duration that each algorithm takes to encrypt or to decrypt the particular size of each text file. There are many types of encryption algorithm, which can be used to encrypt the computerized information in different Organizations, whose all algorithms can encrypt and decrypt any size of text file, but the time duration of each Algorithm during the encryption or decryption process of specific file size is not fixed. Some of the algorithms are suitable for encryption of specific ranges of the file size, or some of algorithms are functional while encryption small size of files, and others algorithms are functional for encryption of big size of text files, based on the time duration disparity among symmetric algorithms during encryption of text files. In this study five symmetrical algorithms are merged in one program using classes and concept of inheritance in the form that if encryption is needed, the program will select the file and it checks the size of the text file. After this process the program automatically will select the suitable encryption algorithm to encrypt the specific text file according to the range of the file size. Knowing that the file size before or after encryption will not change or is stable, in this case of the decryption algorithm will apply the same process of encryption while decrypting files, the program of encryption and decryption code will write using visual Studio 2013. The result will be analyzed with R program (R software), the cipher text will appear in the format of UTF8 which means Unicode Transformation Format, “8” Means “8” bits to represent a character, the size format that will apply in the program will be in format of KB (kilo Byte).
Evaluation of Cavity Formation and the Use of Cut-off Wall to Reduce the Risk of Washing Subsurface Fine Material  [PDF]
Fouzan Alfouzan, Muawia A Dafalla, Akeel Alharbi
Open Journal of Geology (OJG) , 2013, DOI: 10.4236/ojg.2013.32B015
Abstract:

This study shows the results of mapping numerous cavities and distress which appeared and detected in Qassim area, Saudi Arabia. This phenomenon was observed near a school building and residential area and became a serious risk to occupants and residents. The survey was carried out applying geotechnical techniques which included advancing rotary boreholes to depths of 23 m to 30 m with sampling and testing. The evaluation process also included resistivity imaging profiles using 2D electrical resistivity measurements. Results obtained from this research showed a thick top layer of silty clayey sand soil rich of gypsum and carbonate presenting a hazardous and high-risk soil type. The percentage of fines that are likely to be washed out as a result of chemical disintegration and exposure to significant hydraulic gradient was of great concern. Assessment was made using combined geotechnical and geophysical approach in addition to chemical tests. Based on the data collected and analysis of test results a practical solution was suggested to solve this problem. The use of cut-off wall in order to reduce the level of subsurface scour and cajuvity formation were found appropriate. The depth of the cut off wall was determined based on the subsurface geological profile. Advantages of this approach and concerns need to be considered in adopting typical solutions that are presented.

HIV and AIDS related knowledge, beliefs and attitudes among rural communities hard to reach in Sudan  [PDF]
Amar Hassan Khamis
Health (Health) , 2013, DOI: 10.4236/health.2013.59203
Abstract:

Background and Objective: There is a rising concern about Human Immunodeficiency Virus/Acquired Immunodeficiency Syndrome (HIV/AIDS) related knowledge in rural communities of Sudan. This study focuses on determining the extend of knowledge, beliefs, and attitudes about HIV/ AIDS among rural communities difficult to access in the six States of Sudan. Subjects and Methods: Six thousand and one hundred twenty five respondents were interviewed through the method of house-to-house visits. A structured questionnaire was administered by research assistants recruited from the Faculty of Medicine, Khartoum University during a rural residency campaign in six states of Central, Eastern and Northern Sudan during 2008/2009. Results: Of the total interviewees, 48% were aware of the HIV/AIDS risk; 46% reported to have good health seeking behaviors for HIV/AIDS. 54.4% of women reported to have better knowledge about the disease than men (45.6%). 38% (2005) had not heard of safety use of condom whereas 16% (320) had used it. Logistic regression revealed that 5.3% of knowledge about the disease was explained by gender, education and religion adjusted over age of the respondents. Conclusions: Mass media were the most common source of information about the existent risk of HIV/AIDS in rural communities. These findings could assist Sudanese National Aids Programme (SNAP), healthcare providers and policymakers to develop informative materials and health education programs to educate rural community is about the risk of HIV/AIDS.

Re-Visiting the Decay, Missing, Filled Teeth (DMFT) Index with a Mathematical Modeling Concept  [PDF]
Amar Hassan Khamis
Open Journal of Epidemiology (OJEpi) , 2016, DOI: 10.4236/ojepi.2016.61003
Abstract: Background: The well-established DMFT index has been used for over 75 years as a key for measuring dental caries in dentistry. DMFT is applied to permanent dentition and expressed as the total number of teeth decayed (D), missing (M), or filled (F), tooth (T) in an individual. Objectives: The objective of this study is to build a mathematical model for the existing DMFT index and compare its parameters by suggested new mathematical model. Mathematical Models: Fixed Model: Is a mathematical model for the existing DMFT index and will be considered as fixed model; in which all individuals under screening will have the same probability θ, 0 ≤ θ ≤1 of dental caries. In this fixed model the unit of the screening is the individual, and will be evaluated for caries as a dichotomous (0, 1) variable. Random Model: The new suggested model is a random model that suggests a mouth of an individual as an environment and the tooth is a unit of research. In this random model, only the teeth in one mouth have the same probability θ, 0 ≤ θi ≤ 1 where i?=1, 2...,k?; number of screening individuals. Expected Outcome: Mathematically, the fixed model will highlight what the value 1 will hide as information and hence this may explain why the average of DMFT is may be overestimated for any sample studied using fixed model. The random model will yield a cumulative weighed probability on the function of the number of teeth screened per mouth θ, 0 ≤ θ ≤ 1, hence the average DMFT index will be weighed against the number of teeth screened per all subjects. Conclusion: The random model yields an average and more realistic expected value for the population studied. Furthermore, in such model, it is easy to estimate the variance and it is obvious that this model yields the smallest variance.
Studies on the Constituents of Ficus capensis (Thunb)
Hassan Abdalla Almahy Dafalla
Pakistan Journal of Social Sciences , 2012,
Abstract: The first report for isolation and identification of 4, 4, 24-trimelhyl-cholesta-8-en-3-B-ol, mixture of campesterol, stigmasterol and. $-sitosterol, stigmasterol 3-B-o`glucoside and 4, 5, 7-trihydroxy flavan-3-ol. In addition to xantholoxin, $-amyrin and "-amyrin from n-hexane and ethyl acetate fractions of ethanol extract of Ficus capensis (Thunb) leaves Identification of these compounds has been established by spectral evidences (UV, IR, MS, H and C-NMR). Ficus capensis (Thunb) Family Moraceae is an evergreen tree widely 1 13 distributed in tropics. Various parts of the tree has been reported to possess medicinal properties. Both leaves and roots have been used internally as tonic, anti-rheumatic, to reduce fever and for treatment of tuberculosis while externally. They were used for leprosy, leucodermia and swollen fects. Previously we reported the (3,4) isolation and characterization of different constituents from Ficus benjemina and Ficus elastica. Some of these compounds showed interesting biological activities. In the course of our studies on the constituents of different Ficus plants we examined the constituents of Ficus capensis (Thunb). This study deals with the isolation and identification of flavanol, coumarins, steroids and triterpenes from the leaves of the title plant.
Effects of Clay and Moisture Content on Direct Shear Tests for Clay-Sand Mixtures
Muawia A. Dafalla
Advances in Materials Science and Engineering , 2013, DOI: 10.1155/2013/562726
Abstract:
Study of the Mineralogical Changes of Clay Due to Cement and Lime Addition Using X Ray Diffraction Technique
M. Dafalla,E. Mutaz
Research Journal of Applied Sciences, Engineering and Technology , 2012,
Abstract: Light structures in semi arid regions suffer from damage due to expansive subsurface soils subjected to frequent wetting and drying. The use of cement and or lime as stabilizers is a common remedy known to geotechnical engineers. This research is aimed at investigating the mineralogical changes as viewed by x-ray diffraction when lime and cement are added to expansive clay. The x-ray diffraction showed that the mineralogy is not significantly changed due to lime addition while serious alteration and peak collapse of smectite minerals reported with the addition of cement. The percentage of added cement was found proportional to the change in expanding minerals in clay. Adding 6% of cement was found to reduce the expanding minerals of Al-Qatif clay by half compared to 3% cement is added. The stabilization and soil improvement using lime was due to flocculation of clay particles while the improvement obtained by adding cement was due to the cementatious bond and alteration of the mineral structure. Flocculation of clay particles and formation of cementatious bond were found associated with a significant drop in the maximum dry density and changes in the clay compaction characteristics. The outcome of similar studies will serve as a guide to select the appropriate additive and quantity to chemically stabilize clay soils.
Murrah and Sunn herbs induced liver failure
Altraif Ibrahim,Dafalla Mutasim
Annals of Saudi Medicine , 2010,
Abstract:
Penggunaan Model Berstruktur Linear dalam Pembinaan Indeks Kualiti Hidup di Malaysia
Azme Khamis
Matematika , 2000,
Abstract: Linear structural relation or LISREL has been adopted to checkthe relationship between observable variables and latent variables, which reflect to the quality of life. The formation of measurement model and structural model has been able to explain the relation between observable variable and latent variables and between latent variables and latent variables. As many as 15 variables which represent three factors have been taken into consideration in the measurement of quality of life (QOL) index, i.e. socioeconomic factor, demography structure factor and family size formation factor. An example of index measurement has been presented and lastly the QOL index based on three factors is listed according to district and state. It has been found that 59.5% of the districts in Peninsular are below the minimum level, whereas the Federal Territory is at the highest index and Kedah records the lowest index.
Measuring the Spatial Correlation of Unemployment in Iraq-2007
Faisal Khamis
Modern Applied Science , 2011, DOI: 10.5539/mas.v6n1p17
Abstract: Although many studies examined the existence of spatial pattern of unemployment in some developing and many developed countries in improving the prosperity or social status and reducing the inequalities in unemployment between areas of such country, there is still much work to be done. Some of these studies were found spatial pattern for unemployment using different statistical techniques and geographical mapping. Question is raised whether the spatial pattern of unemployment is existed in Iraq? The objective is to investigate the spatial structure of unemployment rate (UR) across different governorates to provide implications for policy makers, investigating the hot spots of UR, and showing visual picture for UR. The study utilized a cross-sectional census data for 18 governorates collected in 2007. Mapping was used as a first step to conduct visual inspection for UR using quartiles. Two statistics of spatial autocorrelation, based on sharing boundary neighbours, known as global and local Moran's I, were carried out for examining the global clustering and local clusters respectively. Based on visual inspection of mapping, the global clustering was found in UR and it was confirmed by the significant statistic found by global Moran’s I . Out of 18, seven governorates: 3, 4, 5, 12, 15, 16, and 17 were found as local clusters in UR based on local Moran's I. In conclusion, the UR varied across different governorates with black spots in northern and southern parts of the country.
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