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Search Results: 1 - 10 of 18630 matches for " Nuha Al Soom "
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Hydrogenation of Alkenes with NaBH4, CH3CO2H, Pd/C in the Presence of O- and N-Benzyl Functions  [PDF]
Nuha Al Soom, Thies Thiemann
International Journal of Organic Chemistry (IJOC) , 2016, DOI: 10.4236/ijoc.2016.61001
Abstract: NaBH4, CH3CO2H, Pd/C has been described as an effective reagent system to hydrogenate alkenes. Here, we show that the hydrogenation occurs chemoselectively, making it possible to hydrogenate alkenes under Pd/C catalysis with hydrogen created in situ without O- or N-debenzylation.
Study and Design of Hybrid Triplet Lens  [PDF]
Nuha F. Al. Al-Hariby, Abed M. Kassim, Issam H. Al-Ahdali
Optics and Photonics Journal (OPJ) , 2015, DOI: 10.4236/opj.2015.54015
Abstract: This study presents a new method for designing algorithm for a triplet lens with one or two elements that are made of a gradient index medium (GRIN). This method is based upon considering a well-known designed triplet lens (Cooke triplet lens) as a target lens for designing of the Hybrid Triplet Lens (HTL). Our design was based upon keeping the total optical path length for the axial ray fixed for each case of design. The results showed that several designs for the HTL have the same total powers of the target lens. These designs depend on the variation of the GRIN element parameter values and the order of the GRIN element position in the system. These HTL designs have been evaluated by considering several optical merit functions, i.e., the root mean square (RMS) spot radius, wave front error and the spherical aberration. To achieve the optimal design, these functions are compared for the target lens and the HTL designs through a wide range of field angles.
Body Mass Index and Breast Cancer Risk: A Retrospective Multi-Institutional Analysis in Saudi Arabia  [PDF]
Volker Rudat, Nuha Birido, Saleh Tuwaijri, Mousa A. Al-Abbadi
Advances in Breast Cancer Research (ABCR) , 2013, DOI: 10.4236/abcr.2013.21002
Abstract: Background: The purpose of this study was to evaluate the association between the body mass index (BMI) of breast cancer patients and non-cancer females of the Eastern Province of Saudi Arabia. Methods: The weight, height and age was obtained from the patient records of 706 newly diagnosed breast cancer patients and of 20,872 non-cancer female patients who consulted the two largest hospitals in the Eastern Province of Saudi Arabia between 2006 and 2012. Factorial analysis of variance (ANOVA) was used to assess the association between the BMI, age and breast cancer status. Results: The mean BMI of the non-cancer females was 29.4 and the percentage of obese patients of the different age groups ranged from 23.9% to 66.5%. The BMI increased significantly with age. The ANOVA revealed that breast cancer patients older than 50 years had a significantly lower BMI compared to their non-cancer counterparts (p = 0.01). Conclusion: Our data confirm the high BMI of the Saudi Arabian female population. The reason for our finding of a lower BMI of postmenopausal breast cancer patients compared to their non-cancer counterparts is unclear. Future studies are warranted to assess the impact of possible confounding factors on the association between obesity and breast cancer risk. An interesting factor to investigate in future studies would particularly be the use of the anti-diabetic and cancer-protective drug metformin considering that diabetes mellitus is endemic in Saudi Arabia with a prevalence of 30%.
Economic Impact of Class Attendance Systems on Universities  [PDF]
Reda Shbib, Hala Sabbah, Hussein Trabulsi, Nuha Talal Abou Al-Timen
Journal of Computer and Communications (JCC) , 2019, DOI: 10.4236/jcc.2019.711001
Abstract: This paper aims to develop a platform that allows face features to be extracted faster using multiple algorithms for looking up people in a large database. We will be presenting an enhanced technique for human face recognition where we will be using an image-based approach (process of using two-dimensional images to create three-dimensional models) towards artificial intelligence by extracting features from face images by using Principle Component Analysis, Local Directional Pattern and SVM Machine Learning. Up until now, studies focusing on face recognition rely on the fusion of PCA (Principle Component Analysis) and LBP (Local Binary Pattern) for feature extraction, PCA and LBP were used for global feature extraction of the whole image and the features of the mouth area separately. Results show that this method was susceptible to random noise and resulted in a performance rate of 89.64% [1]. Also, recent studies have shown the fusion of PCA (Principle Component Analysis) and LDP (Local Directional Pattern) for feature extraction [2]. First, PCA is adopted to extract global features of facial images, then LDP operator is used to extract local texture features of eyes and mouth area and these areas are calculated by comparing the relative edge response value of a pixel in different directions. This fusion resulted in a performance rate of 91.61%. The results of PCA and LDP method show that it is more effective than adopting the fusion of PCA and LBP. It’s more robust to noise and improves the rate of facial recognition. However, both methods still suffer from changes in illumination, pose changes, random noise, and aging. In this paper, we propose using a set of trained images to make the facial recognition process faster and provide more accurate results.
DFT Calculations for Corrosion Inhibition of Ferrous Alloys by Pyrazolopyrimidine Derivatives  [PDF]
Nuha Ahmed Wazzan, Fatma Mohamed Mahgoub
Open Journal of Physical Chemistry (OJPC) , 2014, DOI: 10.4236/ojpc.2014.41002
Abstract:

The inhibition performance of 5-tolyl-2-phenylpyrazolo[1,5-c] pyrimidine-7(6H)thione (Tolyl), 5-tolyl-2-pheenylpyrazolo [1,5-c]pyrimidine-7(6H)one (Inon) was investigated as corrosion inhibitors using density functional theory (DFT) at the B3LYP/6-31 + G(d,p) level of theory. The calculated quantum chemical parameters correlated to the inhibition efficiency are: the highest occupied molecular orbital energy(EHOMO), the lowest unoccupied molecular orbital energy (ELUMO), the energy gap (ΔEL-H), dipole moment (μ), ionization energy (Ι), electron affinity (Α), absolute electronegativity (χ), absolute hardness (η), absolute softness (σ), the fraction of electron transferred (ΔN), and the total energy (Etot) which were calculated. The local reactivity has been analyzed through the Fukui function and local softness indices in order to compare the possible sites for nucleophilic and electrophilic attacks. The success of DFT calculations in predicting the inhibition efficiency was assessed.

Assessments of Elastic Anisotropy of Banded Amphibolite as a Function of Cleavage Orientation Using S- and P-Wave Velocity  [PDF]
Ali Esamaldeen, Guang Wu, Mohamed Nuha
Journal of Geoscience and Environment Protection (GEP) , 2015, DOI: 10.4236/gep.2015.35008
Abstract:

As most rocks are of an anisotropic nature, the measurement elastic modulus of anistropic rocks is of general interest. Nevertheless, uniaxial compression test is common method to measure the dynamic elastic constants of anisotropic rocks; the use of ultrasonic pulse test is attractive, because the test is non-destructive and easy to apply. This study aimed to demonstrate the influence of orientation of foliation planes of banded amphibolite rocks on the compressional (Vp), shear wave (Vs) velocities propagating and elastic modules using ultrasonic pulse test. The result showed that the planes of foliation have a major effect on the wave velocity, where the Vp and Vs were taken parallel to the foliation plane show higher values than those obtained in the other directions (β = 30, 60 and 90). The preliminary conclusions are developed concerning that the elastic modulus is vary continuously as a function of cleavage orientation with respect to the direction of wave propagations, where Poisson’s ratio having the smallest relative change. The highest values of Young’s modulus and shear modulus are observed for foliation dip angles of 0? and the lowest values are for foliation dip angles of 90. This indicates that the observed intrinsic anisotropy and the close relations of the directional dependent seismic anisotropy to the foliation planes are mainly a result of crystallographic preferred orientation of major minerals (e.g. horn- blende and elongated quarts grains).

Simultaneous Determination of Miconazole Nitrate and Metronidazole in Different Pharmaceutical Dosage Forms by Gas Chromatography and Flame Ionization Detector (GC-FID)
Safwan Ashour,Nuha Kattan
International Journal of Biomedical Science , 2011,
Abstract: A simple, rapid and precise gas chromatographic method has been developed for the simultaneous determination of miconazole nitrate (MIZ) and metronidazole (MNZ) in tablets and ovules, using a capillary column AE.SE-54 (15 m × 0.53 mm, i.d.) and nitrogen as a carrier gas at a flow rate of 9 mL min-1. The oven temperature was programmed at 140°C for 3 min, with a rise of 40°C min-1 up to 180°C (held for 2 min) and then increased to a final temperature of 250°C. The injector and detector port temperatures were maintained at 260°C. Detection was carried out using flame ionization detector. Results of assay and recovery studies were statistically evaluated for its accuracy and precision. The retention times were about 3.50 and 12.90min for MNZ and MIZ, respectively. Linearity ranges were 50.0-6030.0 and 62.5-2000.0 μg mL-1 for MNZ and MIZ, with limit of detection values of 2.5 and 3.1 μg mL-1, respectively. Correlation coefficients (R2) of the regression equations were greater than 0.999 in all cases. No interference from any components of pharmaceutical dosage forms or degradation products was observed. According to the validation results, the proposed method was found to be specific, accurate, precise and could be applied to the simultaneous quantitative analysis of MIZ and MNZ in tablets and ovules.
OPTIMIZING THE WAVELET PARAMETERS TO IMPROVE IMAGE COMPRESSION
Allam Mousa,Nuha Odeh
International Journal of Advances in Engineering and Technology , 2012,
Abstract: Wavelet compression technique is widely used to achieve high good compression factor. In this paper, certain experiments were performed to identify the importance and the sensitivity of this technique to various internal and external parameters. Compression factor and SNR are the main factors to be optimized here against many factors like; image type, division factor, subblock size. Changing these parameters has shown a significant change in the performance leading to verified steps on how to choose these parameters in order to optimize the performance to get better compression and quality.
Simultaneous Determination of Clidinium Bromide and Chlordiazepoxide in Combined Dosage Forms by High-Performance Liquid Chromatography
Safwan Ashour,Nuha Kattan
Journal of Pharmaceutics , 2013, DOI: 10.1155/2013/417682
Abstract: A sensitive and precise RP-HPLC method has been developed for the simultaneous estimation of clidinium bromide (CDB) and chlordiazepoxide (CDZ) in pure and pharmaceutical formulations. The separation was achieved on a Nucleodur C8 ( ?mm i.d., 5?μm particle size) column at 25°C. CH3CN-MeOH-NH4OAc 0.1M (30?:?40?:?30, v/v/v) was used as the mobile phase at a flow rate of 1.0?mL?min?1 and detector wavelength at 218?nm. Almotriptan (ALT) was used as internal standard. The validation of the proposed method was carried out for linearity, accuracy, precision, LOD, LOQ, and robustness. The method showed good linearity in the ranges of 2.5–300.0 and 3.0–500.0?μg?mL?1 for CDB and CDZ, respectively. The percentage recovery obtained for CDB and CDZ was 100.40–103.38 and 99.98–105.59%, respectively. LOD and LOQ were 0.088 and 0.294?μg?mL?1 for CDB and 0.121 and 0.403?μg?mL?1 for CDZ, respectively. The proposed method was successfully applied to the determination of CDB and CDZ in combined dosage forms and the results tallied well with the label claim. 1. Introduction Chlordiazepoxide (7-chloro-N-methyl-5-phenyl-3H-1, 4-benzodiazepine-2-amina-4-oxide) is used as an anxiolytic, sedative, hypnotic, anticonvulsant, and/or skeletal muscle relaxant. The drug may inhibit monosynaptic and polysynaptic reflexes by acting as an inhibitory neuronal transmitter or by blocking excitatory synaptic transmission. The drug may also directly depress motor nerve and muscle function [1, 2]. Clidinium bromide (3-[(hydroxy-diphenylacetyl)-oxy]-1-methyl-1-azoniabicylo-[2.2.2] octane bromide is an anticholinergic drug which may help symptoms of cramping and abdominal stomach pain by decreasing stomach acid and slowing the intestines. It is commonly prescribed in combination with chlordiazepoxide by the name of clidinium-c [3]. The United States Pharmacopeia (USP) stated the nonaqueous titration method for the assay of clidinium bromide and chlordiazepoxide [4]. Few methods for the determination of clidinium bromide and chlordiazepoxide in combined dosage forms including HPLC [5–7], derivative spectrophotometry [8, 9], spectrophotometry using multivariate calibration techniques [10], and capillary SFC [11] have been reported. Literature survey revealed that some analytical methods have been used for the individual estimation of clidinium bromide and chlordiazepoxide. Capillary electrophoresis [12] and kinetic spectrophotometric [13] methods for clidinium bromide have been described. Chlordiazepoxide has been determined either alone or with other compounds in pharmaceutical formulations using
Septic Superficial Femoral Vein Thrombophlebitis Causing Pulmonary Emboli and Respiratory Failure: Case Report and Review of the Literature  [PDF]
Ziad Fayad, Paul Guentert, Erin Rissler, Nuha Zackariya, Shivani Patel, Ali Sualeh, Mahmoud Al-Fadhl, Sufyan Zackariya, Grant Wiarda, Mallory Martin, Joseph Lake, Sarah Philbrick, Mark Walsh
International Journal of Clinical Medicine (IJCM) , 2019, DOI: 10.4236/ijcm.2019.108034
Abstract: Septic pulmonary emboli rarely cause respiratory failure that requires mechanical ventilation. The most common causes of septic pulmonary emboli are related to intravenous drug abuse, indwelling intravenous catheters, endocarditis and septic pelvic thrombophlebitis. In addition, soft tissue injury-related thrombophlebitis rarely causes septic pulmonary emboli. We describe a unique case of a 43-year-old man who developed septic thrombophlebitis of the femoral vein following soft tissue injury from trauma to the shin with ensuing septic pulmonary emboli which necessitated endotracheal intubation and mechanical ventilation. The patient required mechanical ventilation for eleven days, developed empyema and grew out methicillin-resistant Staphylococcus aureus on blood cultures. A transesophageal echocardiogram was normal, and there was no indication of bacterial endocarditis. In addition to eleven days of mechanical ventilation, the patient was treated with intravenous heparin, cefepime and clindamycin. These medications were then discontinued and the patient was treated with weight-adjusted vancomycin. Following the return of cultures, the patient was treated for six weeks with ceftaroline 600 mg IV twice a day. In addition, the patient received bilateral thoracentesis followed by chest tube drainage until resolution of the pleural effusions. The patient made a complete recovery. We describe this case and the implications for differential diagnosis and treatment of these two uncommon conditions.
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