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基于代数公式的改进的湍流过渡模型

基于代数公式的改进的湍流过渡模型

作者： md.Khalid hasan 杭州电子科技大学

学位级别：硕士

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基于成衣业个案的精益仓储管理研究

基于成衣业个案的精益仓储管理研究

作者： md.Naimul hasan 北京交通大学

学位级别：硕士

孟加拉国是南亚地区发展中国家之一,近些年经济蓬勃发展,其背后的主要原因是出口导向型企业。孟加拉国从1979年开始出口成衣,现在这个行业在经济中扮演着主要角色。孟加拉国有一千多家成衣工厂,但大多数工厂都没有得到适当的发展。成衣... 详细信息

孟加拉国是南亚地区发展中国家之一,近些年经济蓬勃发展,其背后的主要原因是出口导向型企业。孟加拉国从1979年开始出口成衣,现在这个行业在经济中扮演着主要角色。孟加拉国有一千多家成衣工厂,但大多数工厂都没有得到适当的发展。成衣是通过装配不同的零部件制造出来的,因此,仓库库存、正确的产品供应和预测是成衣业运作的关键,供应链和物流是工厂运作的主要部分,仓库是工厂最关键的区域。仓库需要更高效,以提高供应链绩效。精益思想是一种以最小资源获取最大收益的战略思想,本研究将精益理念应用于仓库和仓储管理中,以期减少作业浪费、提高生产效率,持续改进仓库流程和效率。本研究考察了孟加拉国成衣业,以孟加拉法基尔时装有限公司的一个仓库为研究平台进行案例研究,在仓库中实施精益原则,应用了文献回顾、监控、SAP、访谈等方法,对仓库项目和运作进行了分析,并利用科学、定量的方法来确保网络中的工作流程以尽可能少的非增值操作完成,包括5s、价值流映射、Kizan工具、JIT(准时制)、标准化工作方法、7种浪费的识别等,确定了精益思想的实施模式。通过研究发现,根据客户的需求,运用精益管理思想,可以减少仓库的运作时间,提高库存水平,能够产生效益,同时减少生产过程中的浪费。

关键词：仓储管理供应链管理精益思想 5S 7种浪费

教师在农村中学教学中的ICT整合：在孟加拉国的一项质性调查

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教师在农村中学教学中的ICT整合：在孟加拉国的一项质性调查

作者： md.Arif hasan 东北师范大学

学位级别：硕士

信息和通信技术(ICT)已在许多国家被广泛接受,以促进教学实践。在孟加拉国,信息通信技术也被引入教育系统的各个阶段。目前的研究集中在位于孟加拉国农村地区(西北部)的一所中学。本研究的目的是通过调查教师对将ICT融入其教学实践的有... 详细信息

信息和通信技术(ICT)已在许多国家被广泛接受,以促进教学实践。在孟加拉国,信息通信技术也被引入教育系统的各个阶段。目前的研究集中在位于孟加拉国农村地区(西北部)的一所中学。本研究的目的是通过调查教师对将ICT融入其教学实践的有效性的信念、他们对应用ICT的感知技能和能力以及他们在农村中学实施ICT的挑战,了解ICT整合在农村中学的现状。教学。本研究采用WST模型来调查教师对ICT的整合。本研究使用定性案例研究设计来回答研究目标。研究发现,大多数教师对将ICT融入教学和学习实践抱有积极的信念,而少数教师也持消极信念。农村中学教师可以将一些特定的教育技术融入到他们的教学活动中。然而,他们也报告说他们对数字素养、计算机素养以及将这些工具和技术整合到课堂实践中的知识匮乏。由于他们对技术和技巧的了解不足,他们在ICT集成方面的能力和信心水平较低。除此之外,他们还面临着缺乏适当培训、基础设施差、网速差、技术费用和不平等、缺乏学校技术支持以及设备不可靠等挑战。

关键词： ICT整合中学农村教师孟加拉国 ICT技能和能力

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基于TCP/IP的水下无线通信

基于TCP/IP的水下无线通信

作者： hasan md.AKTARUL 浙江理工大学

学位级别：硕士

In this paper,an underwater wireless（acoustic）communications system is described that leads to the design and advancement of a small,inexpensive system based on a lowfrequency,single-directional piezoelectric transducer to communicate via a ***8-bit micro-controller and a piezo transducer were used to encode data into an acoustic wave that was transferred through water and detected by another microcontroller that used an identical piezo transducer as a *** is capable of delivering a throughput of up to 400 bps within the 1-3 k Hz *** is an adaptable platform that may be used in a range of different *** operation,the system can be modified as needed by changing its implementation on the *** frequencies were selected due to the piezo elements and equipment’s intrinsic limitations,as well as to reduce selfgenerated interference from reflected *** system was built to be extensible,so features like error-correction coding,frequency hopping,real-time channel characteristics and automatic gain control may be simply implemented to improve *** system was created primarily for portability.A 12-bit digital to analog converter（DAC）is used for signal generation through the transmitter,and with a microcontroller’s built-in analog to digital converter（ADC）and an FFT-based architecture,the receiver has unique features and enhancements..

关键词：

气候对国际贸易的影响研究 ——以亚洲国家与中国的贸易为例

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气候对国际贸易的影响研究 ——以亚洲...

作者： hasan md.ZAHID 厦门大学

学位级别：硕士

几十年来气候对自然和人类系统的广泛影响—直是—个争论的问题。很多关注点集中在考察气候与经济之间的关系。国际贸易作为经济的重要组成部分之—,它与气候冲击的关系研究引起了人们的关注。本研究的目的是利用1992年至201 6年亚洲45... 详细信息

几十年来气候对自然和人类系统的广泛影响—直是—个争论的问题。很多关注点集中在考察气候与经济之间的关系。国际贸易作为经济的重要组成部分之—,它与气候冲击的关系研究引起了人们的关注。本研究的目的是利用1992年至201 6年亚洲45个国家的贸易、气温和降雨量数据来描述和研究这—关系。利用可行广义最小二乘法（FGLS）估计了气候对亚洲国家与中国的贸易的影响。研究发现,对于亚洲国家而言,出口增长率和进口增长率与气温呈负相关。如果气温上升1C°,亚洲国家对中国的出口增长率将下降3.62个百分点,亚洲国家从中国的进口增长率将下降7.81个百分点。就年降雨量而言,如果降雨量增加100毫米,亚洲国家从中国的进口增长率将下降0.25个百分点。通过控制气候变量与某些国家特征的虚拟变量的交叉项,研究进—步发现,高温、热带和沿海国家的出口增长率随温度的升高而降低,贫困国家和农业国家的出口增长率随着降雨量的增加而降低,而岛屿国家的出口增长率则随着降雨量的增加而增加。在进口方面,高温降低了所有类型国家的进口增长率,但降雨仅对贫困国家、农业国家和沿海国家有显著的负面影响。我们还发现热带地区是最脆弱的地区。对于不同类型的贸易产品做进—步分析发现,亚洲的农产品、制造业和工业产品受到气候冲击的影响显著。

关键词：气候温度降雨量出口进口

微生物厌氧耦合不同电子受体降解甲氧苄啶研究

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微生物厌氧耦合不同电子受体降解甲氧苄啶研究

作者： hasan md.MAHMUD 哈尔滨工业大学

学位级别：硕士

污水处理厂是抗生素抗性基因(ARG)和抗生素抗性细菌(ARB)传播的重要源。如何提升抗生素脱毒/降解效率、有效阻断ARG的传播是环境领域的重大科学与技术问题。基于水体环境中频繁检出的磺胺类抗生素(Sulfonamides,SAs)去除的紧迫性以及控... 详细信息

污水处理厂是抗生素抗性基因(ARG)和抗生素抗性细菌(ARB)传播的重要源。如何提升抗生素脱毒/降解效率、有效阻断ARG的传播是环境领域的重大科学与技术问题。基于水体环境中频繁检出的磺胺类抗生素(Sulfonamides,SAs)去除的紧迫性以及控制抗生素抗性基因(ARGs)蔓延的必要性,本研究创新性地将磺胺类抗生素的生物降解过程与不同电子受体的厌氧呼吸过程耦合起来,研究不同分散式电子受体(硫酸盐、硝酸盐、三价铁)和可持续的固定式电子受体(生物电化学系统的阳极)条件下磺胺类抗生素的厌氧生物降解特征与降解途径和作用机制异同点。甲氧苄啶(trimethoprim,TMP)是一种在各种环境中频繁被检测到的磺胺类抗生素,对环境生态系统具有潜在危害。微生物是环境中抗生素类新兴有机污染物降解与转化的主要驱动因素。然而,甲氧苄啶与不同电子受体结合的厌氧生物降解的可行性和稳定性仍然知之甚少,功能微生物群落结构与组成鲜有报道。本研究的主要内容包括研究分散式电子受体(硫酸盐,硝酸盐和三价铁)和固定式电子受体(生物电化学系统中的阳极)引入时甲氧苄啶的生物降解特性、转化途径和核心微生物组特征。以市政活性污泥/河流沉积物为初始接种物,成功富集了几种TMP降解微生物菌群。驯化的菌群能够通过去甲基化途径转化TMP,以硫酸盐作为电子受体进一步降解羟基取代的去甲基化产物(4-去甲基-TMP)。TMP的生物降解遵循3参数S形动力学模型。潜在的降解菌(Acetobacterium,Desulfovibrio,Desulfobulbus和未鉴定的Peptococcaceae)和发酵罐(Lentimicrobium和Petrimonas)在驯化的菌群中显着富集。活化污泥和河流沉积物驯化获得TMP降解菌群共享相似的核心微生物组。在共基质乙酸钠存在或不存在下,通过富集的生物阳极群落(以电极作为电子受体)同时去除TMP并产生电流。共基质乙酸钠的存在与TMP的强化生物降解和提高的电流密切相关。当TMP用作唯一的电子供体时,与共代谢模式相比,TMP的降解速率和效率(192h,57%vs 24 h,99%)与产生电流(0.075mA vs 0.35 mA)均明显降低。更重要的是,TMP的厌氧生物降解还可以与其他电子受体如硝酸盐和三价铁的还原过程耦合。电子受体的供应可以明显提高不同初始接种物富集的功能微生物菌群的TMP降解效率。本研究结果为水体环境中抗生素如甲氧苄啶的强化降解去除和评估环境微生物介导的归趋与转化提供充分的理论基础和技术支撑。

关键词：甲氧苄啶厌氧生物降解不同电子受体微生物电化学核心微生物组

Demographic, Clinical and Biochemical Characteristics of Drug Naive Type 2 Diabetes Patients of Bangladesh

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Open Journal of Endocrine and Metabolic Diseases 2021年第8期11卷 145-154页

作者： Shahjada Selim Masud-Un Nabi Mohammad Saifuddin Mohammad Abdul Hannan Muhammed Abu Bakar Samir Kumar Talukder A. B. M. Kamrul hasan Mohammad Nurul Amin md. Azizul Hoque md. Shahinur Rahman Ahmed Salam Mir Faria Afsana Department of Endocrinology Bangabandhu Sheikh Mujib Medical University Dhaka Bangladesh Department of Endocrinology Rajshahi Medical College Rajshahi Bangladesh Diabetes & Endocrinology Dhaka Medical College Dhaka Bangladesh Department of Endocrinology North East Medical College & Hospital Sylhet Bangladesh Department of Endocrinology Chattogram Maa O Shishu Hospital Chattogram Bangladesh Department of Endocrinology Rangpur Medical College Rangpur Bangladesh Department of Endocrinology Mymensingh Medical College Mymensingh Bangladesh Department of Endocrinology Mugda Medical College Dhaka Bangladesh Endocrinology Shaheed Ziaur Rahman Medical College Bogura Bangladesh Department of Diabetes and Endocrinology Pabna Diabetic Association Hospital Pabna Bangladesh Department of Endocrinology Bangladesh Institute of Health Sciences Dhaka Bangladesh Department of Endocrinology BIRDEM Dhaka Bangladesh

Background: Although the frequencies of getting drug naive type 2 diabetes patients among all the diabetic patients are very low, nowadays it claims more attention in the treatment procedures of drug naive diabetic patients. But in Bangladesh, we have very few research-oriented data regarding the demographic, clinical and biochemical characteristics of drug naive type 2 diabetes patients. The aim of this study was to determine the demographic clinical and biochemical characteristics of drug naive type 2 diabetes patients of Bangladesh. Methods: This was an open label observational real-life study which was conducted in the chambers of the investigators in several places of Bangladesh as outdoor setting during the period from August 2020 to December 2020. In total, 250 patients with drug naive type 2 diabetes mellitus were enrolled as the study population. Proper written consents were taken from all the participants before starting data collection. A pre-designed questionnaire was used in patient data collection. All data were processed, analyzed and disseminated by MS Office and SPSS version as per need. Result: Two hundred and fifty (250) participants were selected as study population. The male-female ratio of the participants was 1.4:1. The highest number of participants was from 51 - 60 years’ age group (31.20%). The highest number of participants (41%) was with overweight (BMI: 25 - 30 kg/m2). Majority (65%) of the patients of this study suffered from diabetes for ≤5 years. The mean (±SD) SBP of the participants was 137.25 ± 17.50 mmHg and the mean (±SD) DBP of the participants was 85.16 ± 13.39 mmHg. We found the mean (±SD) fasting blood sugar (mg/dl), post prandial blood sugar (mg/dl), total cholesterol (mg/dl), triglycerides (mg/dl), HDL-Cholesterol (mg/dl), LDL-cholesterol (mg/dl), VLDL-cholesterol (mg/dl), uric acid (mg/dl), creatinine (mg/dl), urea (mg/dl), total bilirubin (mg/dl), direct biliru

关键词： Demographic Biochemical Clinical Characteristics Drug Naive Type 2 Diabetes Bangladesh

Internal Jugular Vein Graft after Inadvertent Severing of the Internal Carotid Artery during Carotid Endarterectomy and an Urgent Re-Exploration for Immediate Post-Operative Wound Site Bleeding: A Case Report

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Open Journal of Modern Neurosurgery 2023年第2期13卷 94-104页

作者： md.Shahid hasan Khan md.Shahidur Rahman Sikdar Muhammad Robiul Hoque Hojaifa Ahmad Aminur Rahman md.Ahsan Arif md.Atique Rahman Tanbir Siddique md.Motashimul hasan md.Sumon Rana md.Shafiqul Islam Department of Neurosurgery Dhaka Medical College Hospital Dhaka Bangladesh Department of Neurosurgery Dhaka Medical College Dhaka Bangladesh

Carotid endarterectomy is a well-established treatment for preventing stroke in selected patients. Although there is debate over whether patch angioplasty or primary closure should be used to reconstruct the bifurcation after carotid endarterectomy, there is growing evidence in the literature in favor of patch angioplasty. When compared to primary closure, patch angioplasty during conventional carotid endarterectomy is suggested to lower the incidence of restenosis and recurrent ipsilateral stroke. Various materials have been used as a patch in this procedure, including the saphenous vein, synthetic patches, or less frequently, an internal jugular vein patch where extensive narrowing of the internal carotid artery is evident. In our case, we used an internal jugular vein graft after inadvertent severing the internal carotid artery (ICA) during carotid endarterectomy after the failure of reconstruction with a saphenous vein patch. We also encountered immediate postoperative reactionary hemorrhage following anesthetic reversal, necessitating an urgent re-exploration. The purpose of this case report is neither an attempt to suggest all patients need angioplasty nor to state that an internal jugular vein patch or graft is superior to synthetic material or saphenous veins;rather, it is an attempt to emphasize a potentially effective rescue way to reconstruct inadvertent extensive vascular injury during carotid endarterectomy.

关键词： Carotid Endarterectomy Internal Jugular Vein Graft Venous Patch Reactionary Hemorrhage

Incidence, Risk Factors and Short Term Outcome of Acute Kidney Injury among Patients with Acute Coronary Syndrome

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Journal of Biosciences and Medicines 2020年第5期8卷 177-188页

作者： md. Kabir Hossain Muhammad Rafiqul Alam Asia Khanam A. K. M. Shahidur Rahman Rafi Nazrul Islam Syed Fazlul Islam Mohammad Kamrul Ahsan S. K. Mamun-Ar-Rashid Tanvir Rahman md. Nazmul hasan Department of Nephrology Bangabandhu Sheikh Mujib Medical University (BSMMU) Dhaka Bangladesh Department of Nephrology & Dialysis BIRDEM General Hospital Dhaka Bangladesh Holy Family Red Crescent Medical College Hospital (HFRCMCH) Dhaka Bangladesh Department of Medicine Khulna Medical College Hospital Khulna Bangladesh Department of Nephrology United Hospital Limited Dhaka Bangladesh Department of Cardiology Ad-din Medical College Hospital Dhaka Bangladesh

Background: Cardio-renal syndrome is the leading cause of death globally. Acute kidney injury (AKI) is a major complication among patients admitted in Coronary Care Unit (CCU) with acute coronary syndrome (ACS). AKI in ACS patients is associated with higher morbidity, mortality and prolong hospital stay. Objective: To determine the incidence, risk factors and short term outcome of acute kidney injury (AKI) among the patients admitted in CCU with ACS. Methods: This cross sectional study was conducted at Department of Nephrology, Bangabandhu Sheikh Mujib Medical University (BSMMU), Dhaka, Bangladesh from January 2013 to December 2013. Following selection criteria a total of two hundred (200) patients with ACS were studied. AKI was defined according to the KDIGO guideline and further categorized by RIFLE criteria. Data of patients with AKI and those without AKI were analyzed and compared by statistical tests. Results: Majority of the study patients were male (79.5%). AKI was developed in 40 of the 200 study patients (20.0%). The mean (±SD) age of the study patients was 60.1 ± 11.1 years in patients with AKI and 55.9 ± 10.1 years in patients without AKI. Our data analysis showed that older age (>65 years), diabetes mellitus, dyslipidemia and smoking were significantly correlated to the development of AKI. Mortality was significantly high in AKI group (7.15%) compared to no AKI group (1.25%). Out of 27 patients who achieved renal recovery most (80.8%) belonged to risk class. Severity of AKI showed significant effect on renal recovery and final outcome. Conclusion: This study demonstrated that, incidence of AKI among patients with ACS was 20%. Elderly patients, diabetes mellitus, dyslipidemia, and exposure to smoking were significantly associated with development of AKI in ACS.

关键词： Acute Kidney Injury (AKI) Acute Coronary Syndrome (ACS) Cardio-Renal Syndrome