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An Efficient Numerical Method and Parametric Study for Electrolyte Transport in the Renal Medulla

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Journal of Biomedical Science and Engineering 2014年第9期7卷 682-697页

作者： Maryam Saadatmand mohammad J. Abdekhodaie Mahmoud R. Pishvaie Fathollah Farhadi Department of Chemical and Petroleum Engineering Sharif University of Technology Tehran Iran

Mathematical models of the mamalian urine concentrating mechanism consist of a large system of coupled, nonlinear and stiff equations. An efficient numerical orthogonal collocation method was employed to solve the steady-state formulation of urine concentrating mechanism. This method was used to solve the stiff and high order equations of electrolyte transport in a central core, single nephron model of the renal outer medulla. The presented results were in good agreement with implicit finite difference method’s results, but this new method was faster and more stable. Due to the greater stability and larger convergence domain of collocation method over Newton’s method, a parametric study on concentrated urine was investigated. The results showed that this model was sensitive to non-ideal countercurrent exchange between medulla interstitium and vasa recta. Although distal tubule lies in the cortex interstitium, it affects on the inflow to the collecting duct. This study showed that the effect of changing membrane transport properties of distal tubule wall on properties of outflow from the outer medulla collecting duct was considerable.

关键词： Urine Concentrating Mechanism Central Core Model Electrolyte Transport Orthogonal Collocation Parametric Study

Analysis and Design of Different Methods to Reach Optimum Power in Butler Matrix

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International Journal of Communications, Network and System Sciences 2019年第2期12卷 19-35页

作者： Shahideh Kiehbadroudinezhad Jean-Francois Bousquet Michael Cada Adib Shahabi mohammad Ali Kiehbadroudinezhad Department of Electrical and Computer Engineering Dalhousie UniversityHalifaxCanada Department of Mechanic of Biosystems University of TehranTehranIran

With the increasing demand for high speed reliable communications, smart antennas, such as the Butler Matrix array, can be used to develop a system that increases the performance of a wireless system. The Butler matrix is a switched beam array system which can produce orthogonal uniform beams. The main objective is to improve the efficiency of the power in a 90-degree bend. Also, the double-mitered bend is particularly interesting since it provides a substantially lower reflection coefficient and a lower value of S12 at a frequency of 2.4 GHz compared to an unmitered one. Therefore, this paper describes an optimum design using a double-mitered method with a 2 × 2 and a 4 × 4 Butler Matrix array, operating at 2.4 GHz which is used in wireless systems with an FR4 substrate.

关键词： Butler Matrix Beam Forming Phase Shifter Micro Strip

伊朗亚兹德地区眼眶肿瘤的病理及人群分布调查

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国际眼科杂志 2008年第12期8卷 2383-2384页

作者： mohammad Reza Besharati Shokouh Taghipoor Zahra Hashemian Faeseh Kamran 伊朗亚兹德 Shahid Sadoughi大学眼科

目的：回顾1997／2007伊朗亚兹德地区的200例眼及附属器肿瘤的流行病学特征，确定肿瘤的人群分布及肿瘤位置。方法：回顾观察性病例报道。我们回顾1997／2007医院组织病理学确诊为眼眶肿瘤的病例，分析200例连续病例的年龄分布、病理学... 详细信息

目的：回顾1997／2007伊朗亚兹德地区的200例眼及附属器肿瘤的流行病学特征，确定肿瘤的人群分布及肿瘤位置。方法：回顾观察性病例报道。我们回顾1997／2007医院组织病理学确诊为眼眶肿瘤的病例，分析200例连续病例的年龄分布、病理学、肿瘤来源及肿瘤位置。结果：患者200例（男111例，女89例），其中110例（55．0％）为良性肿瘤，86例（43．0％）为恶性，4例（2．0％）为转移性肿瘤。119例（59．5％）为眼睑肿瘤，21例（10．5％）为眼眶，60例（30．0％）位于眼球。最常见的恶性肿瘤是基底细胞癌（BCC）（25．5％）、鳞状细胞癌（SCC）（6．0％）及黑素瘤（5．5％）。各种类型的痣（15．0％）、皮样囊肿（5．5％）、血管瘤（5．0％）是最常见的良性肿瘤。200例患者按年龄分为两组，18岁以上及18岁以下。18岁以下患者中，最常见的是良性肿瘤（90．1％），恶性肿瘤及转移性肿瘤分别占8．4％和1．5％。然而，18岁以上患者，常见的是恶性肿瘤（51．1％），良性肿瘤占47．1％，转移性肿瘤占1．8％。结论：眼眶肿瘤的病理学特征与患者的年龄及肿瘤在眼及附属器的位置有关。在进行活检及肿瘤切除术之前，患者的发病年龄和肿瘤位置可成为我们制定治疗方案的前提，也是预后评估的重要信息。

关键词：眼眶肿瘤恶性的良性肿瘤转移性肿瘤

Design of Fuzzy PD-Controlled Overhead Crane System with Anti-Swing Compensation

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Engineering（科研） 2011年第7期3卷 755-762页

作者： Shebel Asad Maazouz Salahat Mohammed Abu Zalata mohammad Alia Ayman Al Rawashdeh 不详

This work aimed to find a proper control strategy to transfer loads using overhead cranes. The proposed control strategy, which is Fuzzy PD-based, should take into account two main factors. First, the time needed to move the payload from the initial pick up point to the destination point that must be minimized. Second, the oscillation of the payload must be reduced to prevent hazards for people and equipment in the work place. The current work, presents a comparative analysis of fuzzy PD based control basing on classical PD approach. A simplified model has been derived. The proposed control techniques have been designed and validated with MatLab. Numerical comparative results have been obtained and discussed.

关键词： Induction Motor Modeling Stationary Reference Frame Matlab/Simulink

Measuring Tumor Necrosis Factor-Alpha and Interleukin-1 Beta Levels in Mustard Gas Exposed Patients

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Advances in Bioscience and Biotechnology 2017年第4期8卷 134-141页

作者： Hoda Sheibani mohammad Goudarzi Malek Ashtar Esfandiari Fatemeh Rousta Reza Haji Hosseini Graduate of Biochemistry Immunohematology Department Blood Transfusion Center High Institute for Research Center and Education in Transfiusion Medicine Tehran Iran Graduate of Biochemistry Payame Noor University Tehran Iran Hygiene Department Ministry of Education Tehran Iran Department of Microbiology Islamic Azad University Science and Research Branch Tehran Iran Department of Biochemistry Payame Noor University Tehran Iran

Sulfur mustard (SM) is an alkalizing chemical which has been used mostly as a weapon all over the world. Sulfur mustard can cause damages to many organs, especially the skin, respiratory system and the eyes. Generally, many complications of mustard gas result from its alkalizing potency and reaction with cellular components like DNA, RNA, proteins and lipid membranes. The damages caused by SM will lead to many complications which persist during the lifespan of exposed subjects. Pro-inflammatory cytokines including especially TNF-α and IL-1β can cause systemic inflammatory reactions and vast changes like altered cell signaling, migration, cytokine production changes and fever. This study was designed to analyze cytokine levels in mustard-gas-exposed people’s serum in the war between Iraq and Iran, who had the chronic dry-eye symptoms compared to the normal group, 30 years after exposure. In this study, 25 veterans who were exposed to mustard gas were compared to 25 healthy people as control group. The veterans with concurrent involvement of eye, lung, and skin were selected. We used ELISA method to assess the levels of TNF-α and IL-1β in serum of people in both groups. All the results analyzed with T-test in SPSS 17 statistical software. The mean levels of TNF-α and IL-1β in serum of chemical exposed veterans were 52.3 ± 1.4 pg/ml and 3.43 ± 0.3 pg/ml while in the control group were 19.5±1.3 pg/ml and 2.25 ± 0.2 pg/ml, respectively. In the control group, the serum pro-inflammatory cytokine levels were significantly lower than the exposed group (P < 0.05). This study showed that there is a meaningful difference between TNF-α and IL-1β serum levels in the SM exposed group compared to the control group. There are some differences between the present study and others. However, studies on local inflammatory changes in these patients are also limited and need more reviews.

关键词： Mustard Gas (SM) Cytokine TNF-α and IL-1β

Experimental Study of On-Body Radio Channel Performance of a Compact Ultra Wideband Antenna

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Journal of Electromagnetic Analysis and Applications 2015年第1期7卷 1-9页

作者： mohammad Monirujjaman Khan Qammer H. Abbasi Mirazur Rahman Ratil Hasnat Ashique Electronics and Telecommunication Engineering University of Liberal Arts Bangladesh Dhaka Bangladesh School of Electronic Engineering and Computer Science Queen Mary University of London London UK Electrical and Electronic Engineering Primeasia University Dhaka Bangladesh

In this paper, on-body radio channel performance of a compact ultra wideband (UWB) antenna is investigated for body-centric wireless communications. Measurement campaigns were first done in the chamber and then repeated in an indoor environment for comparison. The path loss parameter for eight different on-body radio channels has been characterized and analyzed. In addition, the path loss was modeled as a function of distance for 34 different receiver locations for propagation along the front part of the body. Results and analysis show that, compared with anechoic chamber, a reduction of 16.34% path loss exponent is noticed in indoor environment. The antenna shows very good on-body radio channel performance and will be a suitable candidate for future efficient and reliable body-centric wireless communications.

关键词： On-Body Radio Channel Path Loss Ultra Wideband (UWB) Antenna Body-Centric Wireless Communications

Wave Force on Double Cylindrical Piles: a Comparison between Exact and Finite Difference Solutions

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Journal of Marine Science and Application 2011年第1期10卷 33-40页

作者： Lotfollahi-Yaghin mohammad Ali Moosavi Sayyid Mehdi Lotfollahi-Yaghin Amin Faculty of Civil Engineering University of Tabriz

The wave force exerted on vertical piles of offshore structures is the main criterion in designing *** structures with more than one large pile,the influence of piles on each other is one of the most important issues being concerned in past *** efficient method for determining the interaction of piles is introduced in present *** the wave force is calculated by the exact method using the diffraction theory,then in the finite difference numerical method the force is calculated by adding the velocity potentials of each pile and integration of pressure on their *** results showed that the ratio of the wave force on each of the double piles to a single pile has a damped oscillation around unity in which the amplitude of oscillation decreases with the increase in the spacing *** different wave incident directions and diffraction parameters were used and the results showed that the numerical solution has acceptable accuracy when the diffraction parameter is larger than unity.

关键词： cylindrical piles finite difference numerical method diffraction theory wave force

3 Case Reports of Fulminant Hepatitis A after Karballa Pilgrimage

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Advances in Infectious Diseases 2018年第2期8卷 33-38页

作者： Maryam Ansari Chaharsoughi Hasan Salehi Alireza Emami mohammadreza Yazdani mohammad Mahdi Salehi Department of Infectious Disease Alzahra Hospital Isfahan Iran School of Dentistry Isfahan University of Medical Sciences Isfahan Iran

Introduction: Fulminant hepatitis is a very rare disease that occurs as an acute liver failure within eight weeks of the onset of symptoms following hepatitis A in adults or in patients with a history of chronic hepatitis B or C [1]. Case presentation: There were three cases in this research. The first case was a self-employed male patient aged 26 years from Gaz Borkhar, admitted to Al-Zahral Hospital on January 1, 2016 for fever, chills and vomiting. The second patient was a 20-year-old male athlete from Lenjan and was hospitalized on May 3, 2016 for fever, chills, anorexia, yellowing of the skin, and low consciousness. The third case was a 20-year-old male employee from Isfahan who visited Al-Zahra Hospital for developing nausea, vomiting, and discolored urine, followed by icterus. Conclusion: all patients were young without any underlying disease. Although the disease had a very progressive course leading to coma, all cases fortunately survived through supportive measures and returned to their normal lives.

关键词： Fulminant Hepatitis Deep Coma Positive Hepatitis A Serology Liver Enzyme Elevation

Endoscopic ultrasound guided liver biopsy for parenchymal liver disease

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World Journal of Hepatology 2019年第4期11卷 335-343页

作者： Aun Raza Shah Muhannad Al-Hanayneh Monica Chowdhry mohammad Bilal Shailendra Singh Department of Internal Medicine MetroHealth Medical Center Division of Gastroenterology and Hepatology the University of Texas Medical Branch Division of Gastroenterology Department of Internal Medicine West Virginia University

Liver biopsy plays an essential role in the diagnosis, evaluation and management of a vast proportion of liver diseases. Conventionally, percutaneous and transjugular approaches have been used to obtain liver biopsies. Endoscopic ultrasound guided liver biopsy(EUS-LB) has emerged as a safe and effective alternate in the past two decades. EUS-LB carries a role in evaluation of both benign and malignant diseases of the liver. It can offer higher resolution imaging of the liver and can detect smaller lesions than computed tomography scan of the abdomen or ultrasound scans with the option for doppler assistance to reduce complications. Current evidence demonstrates the superiority of EUS-LB for a targeted approach of focal lesion and there is also evidence of less sampling variability in heterogeneous parenchymal pathologies. These advantages combined with an improved safety profile had led to the rapid progress in the development of new techniques, equipment and procedures for EUS-LB. We provide a comprehensive review of EUS-LB for parenchymal liver disease.

关键词： Liver biopsy Endoscopic ultrasound Endoscopic ultrasound guided liver biopsy Liver disease