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Search Results: 1 - 10 of 612 matches for " Amal Zidan "
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The Prognostic Value of Vitamin D Insufficiency & Vitamin D Receptor Gene Polymorphism in Adult Acute Myeloid Leukemia Patients  [PDF]
Amal Zidan, Alaa Omran, Rania Ghonaim, Fouad Abu-Taleb, Tarek Elgohary
Journal of Cancer Therapy (JCT) , 2019, DOI: 10.4236/jct.2019.105030
Abstract: Background: Vitamin D regulates many aspects of cellular growth and differentiation in normal and cancer cells. There is growing evidence for both serum vitamin D level and VDR gene polymorphism as prognostic factors in hematologic malignancies. Aim of this work: Evaluation of vitamin D serum level and VDR FOKI polymorphism as prognostic factors in adult AML patients. Patients & Methods: Eighty subjects were included in this study, 50 adult patients with newly diagnosed AML and 30 apparently healthy controls matched for age and sex. Venous blood samples were withdrawn from all subjects for measurement of serum 25(OH) vitamin D using competitive photo chemiluminescence and molecular detection of VDR (FOKI) polymorphism, which was done by RFLP PCR. All patients received the standard induction chemotherapy regimen 3 & 7. Results: The rate of vitamin D insufficiency was significantly higher in AML patients compared to controls (58% vs 16%, p = 0.03). The mutant FOKI genotype (FF & Ff) was found in 52 % of patients compared to 23 % of controls (p = 0.02). Patient with sufficient vitamin D level showed a significantly higher complete response rate compared to those with insufficient level (90% vs 44%, p = 0.02), while none of the other clinical features showed significant relation. Patients with wild type FOKI polymorphism (FF) were more likely to have favorable cytogenetics, while patient with mutant FOKI polymorphism
Entanglement and Quantum Discord of Two Moving Atoms  [PDF]
Nour Zidan
Applied Mathematics (AM) , 2014, DOI: 10.4236/am.2014.516240

In this paper we discuss two measures for the quantumness of correlations (quantum discord and entanglement) of two isolated moving atoms which are initially in Werner state. We compare and analyze the effect of the atomic motion in quantum discord and entanglement. The results show that the atomic motion related to the field mode structure parameter can make the entanglement and quantum discord evolve periodically. The results also indicate that the entanglement suddenly disappears during the evaluation but quantum discord remains non zero, so quantum discord is considered as indicator of disentanglement.

Quantum Discord of a Two-Qubit Anisotropy XXZ Heisenberg Chain with Dzyaloshinskii-Moriya Interaction  [PDF]
Nour Zidan
Journal of Quantum Information Science (JQIS) , 2014, DOI: 10.4236/jqis.2014.42011

We investigate the quantum discord of a two-qubit anisotropy XXZ Heisenberg chain with Dzyaloshinskii-Moriya (DM) interaction under magnetic field. It is shown that the quantum discord highly depends on the system’s temperature T, DM interaction D, homogenous magnetic field B and the anisotropy Δ. For lower temperature T, by modulating D and B, the quantum discord can be controlled and the quantum discord switch can be realized.

The Study of Carbon Cost Management under the Carbon Trading Mechanism—Based on the Value Chain Theory  [PDF]
Zidan Wang
Low Carbon Economy (LCE) , 2017, DOI: 10.4236/lce.2017.82005
Abstract: Carbon cost management plays the key role in response to carbon market changes. According to the literature review in China and abroad, this paper breaks the limitations of existing literatures which just focus on discussing the concept of carbon cost management and accounting the carbon cost in operating activities. Combined with the management accounting role definition of full participation in business decision and based on the value chain theory, this paper introduces marketing, human resource management etc. in carbon cost management accounting scope. Also, it recognizes carbon management factors and provides accounting formulas to build a total carbon cost management system and draw its panorama. With this total carbon cost management system, companies could acquire accurate carbon cost statistics to support their business decisions in carbon market.
On the Maximum Likelihood and Least Squares Estimation for the Inverse Weibull Parameters with Progressively First-Failure Censoring  [PDF]
Amal Helu
Open Journal of Statistics (OJS) , 2015, DOI: 10.4236/ojs.2015.51010
Abstract: In this article, we consider a new life test scheme called a progressively first-failure censoring scheme introduced by Wu and Kus [1]. Based on this type of censoring, the maximum likelihood, approximate maximum likelihood and the least squares method estimators for the unknown parameters of the inverse Weibull distribution are derived. A comparison between these estimators is provided by using extensive simulation and two criteria, namely, absolute bias and mean squared error. It is concluded that the estimators based on the least squares method are superior compared to the maximum likelihood and the approximate maximum likelihood estimators. Real life data example is provided to illustrate our proposed estimators.
Intracerebral hemorrhage in children
I Zidan, A Ghanem
Alexandria Journal of Medicine , 2012,
Abstract: Introduction: Intracerebral hemorrhage (ICH) in children is relatively less common as compared to adults. It could be traumatic or spontaneous. Objective: There are limited studies about ICH in children. In this study, we analyze the etiology, clinical features, management options and outcome assessment in this population. Methods: All patients with intracerebral hemorrhage under 18 years of age admitted to the neurosurgery department; Alexandria University Main Hospital and Medical Research Institute over a period of one year (June 2008–May 2009) were subjected to clinical examination, laboratory and radiological investigations and the cause of hemorrhage was determined. Results: Thirty patients with ICH were included in this study. Age of patients ranged from one month to 17.5 years with a higher predilection in males. Presenting features were symptoms of raised intracranial pressure (60%), deterioration in sensorium (46%), limb weakness (36%) and seizures (30.0%). Trauma was the most common cause of ICH and was found in 13 patients (43%), followed by bleeding diathesis in nine patients (30%), arteriovenous malformation (AVM) in five patients (17%), intracranial tumor in two patients and an aneurysm in one patient. Treatment modalities consisted of: hematoma evacuation, excision of AVM, AVM emobilization, aneurysm clipping, tumor excision, and conservative management. Eleven patients were treated conservatively and 19 patients were treated surgically. The outcome showed: good recovery in 14(47%), fair recovery in seven (23%), poor recovery in seven (23%), and death in two patients (7%). Conclusions: Trauma is the leading cause of ICH in children. Bleeding diathesis and AVM come next. The initial neurological status of patients, the size, location and underlying pathophysiology of the hematoma are the most important determinants of patient outcome. Intracerebral hemorrhage due to bleeding diathesis was generally associated with a better outcome.
Management of Posterior Fossa Medulloblastoma in Adults
W Fouad, I Zidan
Alexandria Journal of Medicine , 2010,
Abstract: Background: Medulloblastoma is a malignant tumor of the cerebellum that occurs predominantly in children. It is rare in adults and accounts for less than 1 % of all adult primary brain tumors. Objective: This study was done to study clinical picture, radiological findings, to evaluate the surgical outcome and to assess the effects of postoperative adjuvant therapy in 12 adult patients who had posterior fossa medulloblastoma Methods: This prospective study was carried out on consecutive 12 adult patients who had posterior fossa medulloblastoma. This study was done in Alexandria hospitals over a period of 3 years starting from March 2006 to March 2009. The male to female ratio was 2 to 1(8 males and 4 females) and their ages ranged from 19 to 51 years with mean age of 33, 8 years. Headache was the most frequent symptom (93,5% of patients). As regards the clinical presentation, manifestations of increased intracranial pressure was found in 10 patients (83,3%), cerebellar dysfunction in 8 patients (66,6%), cranial nerve deficits in half of the cases. The tumour was hemispheric in 10 cases (6 lateral and 4 paramedian) and vermian in 2 cases. All patients had preoperative craniospinal MRI examination. No distant or spinal metastases were detected in our patients at the time of diagnosis. All cases underwent surgery in the form of resection of the tumour followed by postoperative craniospinal irradiation. Also two patients with recurrence and metastases received ad-juvant craniospinal radiotherapy and systemic chemotherapy. Mean postoperative follow up period was 24 months, including both clinical and MRI examination. Results: There were no operative mortality, and surgery did not provoke any permanent neurological aggravation. Postoperative MRI studies showed complete tumour resection was achieved in 9 patients (75%). After initial treatment only two patients relapsed in the posterior fossa after one and half year. Recurrence was probably related to incomplete tumor resection and long delay in initiating radiotherapy (3 months after operation). Two of the patients that received adjuvant treatment died: one from distant metastasis and one from recurrent disease. Ten patients remained alive and disease-free with Karnofsky performance status ranging from 80 to100. Conclusion: Adult medulloblastoma was predominant in males and the majority of patients had hemispheric cerebellar tumors. Adults are more likely to have heterogeneous cerebellar tumours on MRI, and this is thought to be related to the greater prevalence of desmoplastic variant in adulthood. Long-term survival was not uncommon. The outcome depends on the site of the tumour with better results obtained in cases with lateral hemispherical tumour that facilitate its complete surgical resection and good irradiation planning.
Autonomous Quantum Perceptron Neural Network
Alaa Sagheer,Mohammed Zidan
Computer Science , 2013,
Abstract: Recently, with the rapid development of technology, there are a lot of applications require to achieve low-cost learning. However the computational power of classical artificial neural networks, they are not capable to provide low-cost learning. In contrast, quantum neural networks may be representing a good computational alternate to classical neural network approaches, based on the computational power of quantum bit (qubit) over the classical bit. In this paper we present a new computational approach to the quantum perceptron neural network can achieve learning in low-cost computation. The proposed approach has only one neuron can construct self-adaptive activation operators capable to accomplish the learning process in a limited number of iterations and, thereby, reduce the overall computational cost. The proposed approach is capable to construct its own set of activation operators to be applied widely in both quantum and classical applications to overcome the linearity limitation of classical perceptron. The computational power of the proposed approach is illustrated via solving variety of problems where promising and comparable results are given.
Acne Flares among University Female Students: The Role of Perceived Factors  [PDF]
Amal A. Kokandi
Journal of Cosmetics, Dermatological Sciences and Applications (JCDSA) , 2013, DOI: 10.4236/jcdsa.2013.33A2006

Objectives: Acne is a common skin disease especially in adolescents and young adults. Several pathogenetic factors are implicated in causing the disease. Typically acne flares and remits in its course. Several factors can cause flares. The aim of this study was to assess the perceived factors of acne flares and the idea of sun creams causing skin darkening. Methods: A questionnaire study of the perceived factors in causing acne flares was studied in university female students. These included food, stress, hygiene and menstrual periods. In addition, the effect of sun creams on causing skin darkening was asked. Results: Food was implicated by 43.2% of patients. Stress and menstrual periods were thought to exacerbate acne by more than 70% of patients while 80% of patients did not think bad hygiene worsened acne. 40% of patients thought the use of sun creams cause skin darkening. Conclusion: More controlled studies are needed to explore the effect of food on acne. Dermatologists need to explain the benefit of using sun creams especially to acne patients while using standard treatments.

Soil Salinity Mapping and Monitoring in Arid and Semi-Arid Regions Using Remote Sensing Technology: A Review  [PDF]
Amal Allbed, Lalit Kumar
Advances in Remote Sensing (ARS) , 2013, DOI: 10.4236/ars.2013.24040

Soil salinity is a serious environmental problem especially in arid and semiarid areas. It either occurs naturally or is human-induced. High levels of soil salinity negatively affect crop growth and productivity leading land degradation ultimately. Thus, it is important to monitor and map soil salinity at an early stage to enact effective soil reclamation program that helps lessen or prevent future increase in soil salinity. Remote sensing has outperformed the traditional method for assessing soil salinity offering more informative and professional rapid assessment techniques for monitoring and mapping soil salinity. Soil salinity can be identified from remote sensing data obtained by different sensors by way of direct indicators that refer to salt features that are visible at the soil surface as well as indirect indicators such as the presence of halophytic plant and assessing the performance level of salt-tolerant crops. The purposes of this paper are to 1) discuss some soil salinity indicators; 2) review the satellite sensors and methods used for remote monitoring, detecting and mapping of soil salinity, particularly in arid and semi-arid regions; 3) review various spectral vegetation and salinity indices that have been developed and proposed for soil salinity detection and mapping, with an emphasis on soil salinity mapping and assessment in arid and semi-arid regions; and 4) highlight the most important issues limiting the use of remote sensing for soil salinity mapping, particularly in arid and semi-arid regions.

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