检索结果-南通市图书馆

Groundwater Vulnerability and Hazard Mapping in an Arid Region: Case Study, Amman-Zarqa Basin (AZB)-Jordan

Journal of Water Resource and Protection 2014年第4期6卷 297-318页

作者： Mustafa Al Kuisi Kholoud Mashal Mohammed Al-Qinna Abdallah Abu hamad Armin Margana Department of Applied Geology and Environment The University of Jordan Amman Jordan Department of Land Management and Environment The Faculty of Natural Resources and Environment The Hashemite University Zarqa Jordan Federal Institute for Geosciences and Natural Resources (BGR) Hannover Germany

The importance of groundwater portability and the possible sources of anthropogenic contamination have led to the development of intrinsic groundwater vulnerability mapping. In this study, groundwater vulnerability map for Amman Zarqa Basin (AZB) has been generated based on information derived and calculated from processed remote sensing information and laboratory analysis. The database was prepared from soil hydro geological and hydrological data, Digital Elevation Model (DEM), and geological maps. For assessment of groundwater vulnerability, the method proposed by the state geological surveys of Germany (GLA-method) has been adapted and applied. The vulnerability map shows about 77% which is about 2919 Km2 of the AZB is classified as very low to low which could be corresponding to the pollution sources due to the absence of potential hazards and also due to low vulnerabilities. These areas could consequently be interesting for future development as they set preferable in view of ground water protection. In addition, about 14% (530 km2) is classified within the moderate vulnerability zone. About 5% (around 19 km2) of the study area lies under the area of high vulnerability zone. Only 4% can be classified as very high risk areas. Groundwater quality results revealed that water leach ate from point source is the main cause for groundwater contaminations in highly vulnerable karstic limestone aquifer (Amman Wadi Es Sir Aquifer-B2/A7). On the other hand, the Kurnub Sandstone aquifer (K) is generally well protected in the central and eastern part of the AZB due to its thick cover of partly marly sequences. However, the Kurnub aquifer might have a potential risk from the recharged infiltrating surface water from the Zarqa River, which is highly polluted due to industrial activities located along the river.

关键词： Groundwater Vulnerability Hazard Selenium Amman Zarqa Jordan

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Radiation Exposure of Leukemia Blood Samples and Its Impacts on the Density of RBC, WBC, and PLT: <i>In Vitro</i>

引用

Open Journal of Biophysics 2012年第4期2卷 130-136页

作者： Asaad H. Ismail Muhamad A. hamad Edrees M. T. Harki Research Group of Medical Physic Physics Department Salahaddin University Erbil Iraq Education College/Scientific Department Salahaddin University Erbil Iraq

Complete blood counts were analyzed for 12 samples (six male & six female: Ages 15-40 years) of leukemia blood Samples for different dose rate and time of exposure using a Radium-226 source. Thus, an optimum time of exposure and exposure dose rate has improved for leukemia blood samples. Blood samples fractionated and placed in plastic wills, and melodic Coulter used to analysis exposed leukemia blood samples before and after exposure. Exposure technique involving CR-39 nuclear track detector and radiation survey dosimeter were used to estimate the alpha particle density incident on the blood samples and the exposed dose rate, respectively. In the first part, density of the accumulation of alpha particle on the surface of leukemia blood samples, and on the surface of CR-39NTDs varies exponentially with the exposed dose rate. This depends on the restricted energy loss of the incident alpha particles and target density. Assess an optimum time of exposure dose rate (1100 μSv/h) was the second objective. This depended on the changes in the blood components (PLT, WBC, and RBC) due to irradiation occurred for different durations of irradia-tion, and the duration of irradiation that influenced the leukemia blood samples (1Male;16 year and one Female 17 years) in this research was five minutes. Changes in the density of PLT, WBC, and RBC for leukemia blood samples and for different male (five male) and females (five female) was the third part of this research. It was found that the changes were variables due to the exposed dose rate. Optimum exposed dose rate to make more effects on the cancer cells for the leukemia blood samples began at the radiation dose rate of 43.25 1.206 μSv/h for both;male and female relatively, and this due to chromosomal aberration of the exposed cells. Finally, comparison study with the healthy blood samples has been investigated. More details are listed and clarified in the tables and figures of this paper.

关键词： Radiation Dose Alpha Particle RBC WBC PLT Leukemia CR-39NTDs

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

利益相关者对智能手机APP（软件）应用于中学化学教与学的态度调查

利益相关者对智能手机APP（软件）应用于中学化学教与学的态度调查

引用

作者：李娜（MAWADA ADAM MOHAKAR hamad）西北师范大学

学位级别：硕士

移动技术适用于支持个性化、正式和非正式的学习,其中基于情景查询的可能是半正式的。现今越来越多的青少年开始使用手机,与此同时手机也渐渐变成了他们最常用的工具之一。本研究的目的是测量中学老师、中学生和中学校长对在化学教学中... 详细信息

移动技术适用于支持个性化、正式和非正式的学习,其中基于情景查询的可能是半正式的。现今越来越多的青少年开始使用手机,与此同时手机也渐渐变成了他们最常用的工具之一。本研究的目的是测量中学老师、中学生和中学校长对在化学教学中使用手机软件的态度。本研究主要采用的研究方法是定量描述分析法,用此方法测量兰州市城关区中学的教师和学生对于使用手机软件的态度。本文中也使用文献综述法、内容分析法等其他研究方法。调查对象为随机选取的城关区兰州市五十四中、十一中和七中三所学校的师生,调查的方式对三百五十名初三学生试试问卷调查,对六名校长、十一名化学老师、三十名学生实施访谈。本研究基于技术接受模型(TAM)设计研究工具、分析数据等去测量相关态度。本研究主要采用SPSS作为统计分析工具,根据调查结果提出针对性的建议。本研究发现在化学教学中使用手机软件利益相关者的态度是积极的。被调查对象认为在化学教学中使用手机软件是易用、并且十分有用,大部分校长、老师、学生知道这些技术应用于化学学习是很有意义的,如果学生获得学校、家长和老师的支持他们是非常乐意使用手机软件的。教师和学生都了解在化学的教与学中使用手机软件是很有用的,并且他们都知道这些软件最有价值的部分。教师和学生认为如果他们可以使用手机软件,会使一些比较难的实验简单的呈现出来,例如:可以在实验室用软件去完成铀的相关实验,因为推断出铀的试验过程非常困难。不仅如此,一些化学实验花费高,并具有危险性,学校也没有能力把这些实验都给学生展示出来,学生们觉得他们可以通过使用软件去观察化学实验的反应。本研究为进一步深入研究给出的建议如下:1.政策制定者和家长对于在中学使用手机的态度有待研究。2.在利益相关者对于使用手机教学在其他科目如:语言学,物理和数学中使用的态度需要进一步研究。3.更多的研究应该着眼于开发适于中学各个科目使用的手机软件。

关键词：化学中学利益相关者态度手机软件技术接受模型

来源：

同方学位论文库评论

在线全文

同方学位论文库

学校读者我要写书评

暂无评论

Day-of-surgery rejection of donors in living donor liver transplantation

引用

World Journal of Hepatology 2012年第11期4卷 299-304页

作者： Bassem Hegab Mohamed Rabei Abdelfattah Ayman Azzam Hazem Mohamed Waleed Al Hamoudi Faisal Aba Alkhail hamad Al Bahili Hatem Khalaf Mohammed Al Sofayan Mohammed Al Sebayel Department of Liver Trans-plantation and Hepatobiliary-Pancreatic Surgery King Faisal Specialist Hospital and Research Center Riyadh 11211 Saudi Arabia Department of Hepato-Biliary-Pancreatic Surgery and Liver Transplantation National Liver Institute University of Menoufiya Menoufiya 32714 Egypt Department of Hepato-Biliary and Pancreatic Surgery University of Alexan-dria Alexandria 21131 Egypt

AIM: To study diagnostic laparoscopy as a tool for excluding donors on the day of surgery in living donor liver transplantation (LDLT).METHODS: This study analyzed prospectively collected data from all potential donors for LDLT. All of the donors were subjected to a three-step donor evaluation protocol at our institution. Step one consisted of a clinical and social evaluation, including a liver profile, hepatitis markers, a renal profile, a complete blood count, and an abdominal ultrasound with Doppler. Step two involved tests to exclude liver diseases and to evaluate the donor’s serological status. This step also included a radiological evaluation of the biliary anatomy and liver vascular anatomy using magnetic resonance cholan-giopanc reatography and a computed tomography (CT) angiogram, respectively. A CT volumetric study was used to calculate the volume of the liver parenchyma. Step three included an ultrasound-guided liver biopsy. Between November 2002 and May 2009, sixty-nine potential living donors were assessed by open exploration prior to harvesting the planned part of the liver. Between the end of May 2009 and October 2010, 30 potential living donors were assessed laparoscopically to determine whether to proceed with the abdominal incision to harvest part of the liver for donation. RESULTS: Ninety-nine living donor liver transplants were attempted at our center between November 2002 and October 2010. Twelve of these procedures were aborted on the day of surgery (12.1%) due to donor findings, and eighty-seven were completed (87.9%). These 87 liver transplants were divided into the following groups: Group A, which included 65 transplants that were performed between November 2002 and May 2009, and Group B, which included 22 transplants that were performed between the end of May 2009 and October 2010. The demographic data for the two groups of donors were found to match; moreover, no significant difference was observed between the two groups of donors with res

关键词： Live donor Laparoscopic assessment Re-jected donors Day of surgery Fatty liver

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Risk Factors for Postoperative Retinal Detachment Following Cataract Surgery

引用

Open Journal of Ophthalmology 2019年第3期9卷 141-150页

作者： hamad Elzarrug Kevin M. Miller Yu Fei Ahmed E. M. Daifalla Ophthalmology Department Faculty of Medicine Benghazi University Benghazi Libya Ophthalmology Department Jules Stein Eye Institute David Geffen School of Medicine at UCLA Los Angelos CA USA Ophthalmology Department Faculty of Medicine Benha University Benha Egypt

Purpose: To determine the relation between patients’ age and degree of myopia on the risk of postoperative retinal detachment following cataract surgery. Setting: University-based cataract referral practice. Patients and methods: This is a retrospective study. The chart of all patients in the practice of 1 surgeon (K.M.M) who had cataract surgery by the Kelman phacoemulsification technique between 1991 and 2010, were reviewed to identify patients (those who had retinal detachment) was associated with 4-control who didn’t detach but had surgery around the same time. Result: Forty-three cases of retinal detachment were identified, the mean age at time of cataract surgery for the RD cases was 57.3 ± 14.7 years (range: 4 to 96 years) and for the control was 69.8 ± 12.9 years (range: 9 to 75 years), p Conclusion: The study shows that risk of retinal detachment and the degree of myopia is linear up to 12.00 diopters of myopia then starting to decline, and the risk of retinal detachment is the highest in age group between 50 to 59 years.

关键词： Retinal Detachment Cataract Surgery Risk Factors Myopia

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

The Influence of Weather and Climate Variability on Groundwater Quality in Zanzibar

引用

Atmospheric and Climate Sciences 2022年第4期12卷 613-634页

作者： Leluu Ramadhan Mohammed Kombo hamad Kai Agnes Laurence Kijazi Said Suleiman Bakar Sara Abdalla Khamis Tanzania Meteorological Authority (TMA) Kisauni Zanzibar State University of Zanzibar Tunguu Campus Zanzibar

Climate change and variability have been inducing a broad spectrum of impacts on the environment and natural resources including groundwater resources. The study aimed at assessing the influence of weather, climate variability, and changes on the quality of groundwater resources in Zanzibar. The study used the climate datasets including rainfall (RF), Maximum and Minimum Temperature (Tmax and Tmin), the records acquired from Tanzania Meteorological Authority (TMA) Zanzibar office for 30 (1989-2019) and 10 (2010-2019) years periods. Also, the Zanzibar Water Authority (ZAWA) monthly records of Total Dissolved Solids (TDS), Electrical Conductivity (EC), and Ground Water Temperature (GWT) were used. Interpolation techniques were used for controlling outliers and missing datasets. Indeed, correlation, trend, and time series analyses were used to show the relationship between climate and water quality parameters. However, simple statistical analyses including mean, percentage changes, and contributions to the annual and seasonal mean were calculated. Moreover, t and paired t-tests were used to show the significant changes in the mean of the variables for two defined periods of 2011-2015 and 2016-2020 at p ≤ 0.05. Results revealed that seasonal variability of groundwater quality from March to May (MAM) has shown a significant change in trends ranging from 0.1 to 2.8 mm/L/yr, 0.1 to 2.8 μS/cm/yr, and 0.1 to 2.0℃/yr for TDS, EC, and GWT, respectively. The changes in climate parameters were 0.1 to 2.4 mm/yr, 0.2 to 1.3℃/yr and 0.1 to 2.5℃/yr in RF, Tmax, and Tmin, respectively. From October to December (OND) changes in groundwater parameters ranged from 0.2 to 2.5 mm/L/yr 0.1 to 2.9 μS/cm/yr, and 0.1 to 2.1℃/yr for TDS, EC, and GWT, whereas RF, Tmax, and Tmin changed from 0.3 to 1.8 mm/yr, 0.2 to 1.9℃/yr and 0.2 to 2.0℃/yr, respectively. Moreover, the study has shown strong c

关键词： Quality of Groundwater Parameters Climate Variability Mean Changes of Climate and Water Quality Parameters

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Effect of Anterior Capsule Polishing on the Need for Laser Capsulotomy

引用

Open Journal of Ophthalmology 2017年第4期7卷 319-331页

作者： hamad Elzarrug Kevin M. Miller Yu Fei Shahriar Farzad Yaroslav O. Grusha Department of Ophthalmology Faculty of Medicine Benghazi University Benghazi Libya Department of Ophthalmology Jules Stein Eye Institute David Geffen School of Medicine at UCLA Los Angeles CA USA

Purpose: To determine the effect of anterior capsule polishing (APC) on the rate of posterior capsule opacification (PCO) as assessed by the need for laser posterior capsulotomy. Setting: University-based clinical practice, Jules Stein Eye Institute, Los Angles, California, USA. Methods: This study involved a retrospective review of eyes that underwent phacoemulsification and intraocular lens implantation between September 1991 and June 1999. Lens epithelial cells in the 763 study eyes were mechanically debrided or polished from the inside surface of the anterior capsules using a pair of Shepherd-Rentsch (Morning STAAR Inc.) capsule polishers. The 484 control eyes that had surgery earlier in the series were not polished. The rate of laser capsulotomy in the ACP and the non-ACP groups was compared using a Kaplan-Meier survival analysis. Multivariate regression was performed to determine if variables other than ACP influenced the need for laser posterior capsulotomy. Results: We identified 763 eyes that had ACP and 484 that did not. At the 24-month follow-up interval, 26.6% of the eyes in the ACP group had received a capsulotomy versus 19.50% in the non-APC. Next, a separate study was done using only one eye per patient, taking the patient as the unit of analysis. Again the capsulotomy rate was higher in the ACP group compared to the non-ACP (1.02 per 100 person-months of follow-up vs. 0.74 per 100 person-months of follow-up). Finally, a third Kaplan-Meier analysis was done on 52 patients that had one eye treated with the ACP procedure and the other eye with the non-ACP procedure. Although the log-rank test showed the statistical significant of this analysis to be borderline, the results again favored the non-ACP group with a lower capsulotomy rate. Multivariate analysis showed very similar results to the above univariate studies. The mean time to capsulotomy was 46 months for the polished group and 70 months for the unpolished group. The severity of cataract (p = 0.4

关键词： Anterior Capsule Polishing Posterior Capsule Opacification Laser Posterior Capsulotomy

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

RF对纳米金标记的RNase-S局部加热效应的研究

引用

第三军医大学学报 2003年第8期25卷 701-704页

作者：翟建才施建平 Kimberly hamad Schifferli 张曙光第三军医大学基础医学部物理学教研室重庆400038 CenterforBiomedicalEngineering MassachusettsInstituteofTechnology

目的　在纳米级或微米级结构的线度可以和热辐射波长λ相比拟的状态下的辐射热传导的研究具有重要的实用意义 ,通过建立生物模型来研究射频电磁辐射 (RF)对纳米结构辐射热传导的特征 ,并探讨微波非热效应的可能作用机制。方法　将制备... 详细信息

目的　在纳米级或微米级结构的线度可以和热辐射波长λ相比拟的状态下的辐射热传导的研究具有重要的实用意义 ,通过建立生物模型来研究射频电磁辐射 (RF)对纳米结构辐射热传导的特征 ,并探讨微波非热效应的可能作用机制。方法　将制备的纳米金标记的RNase S样品通过常规的Poly C水解能力的测定及CD谱的测定分析 ,确定酶的 2级结构的重组成功和活性的存在后 ,比较RF对样品、水和空气的热效应。结果　通过紫外分光光度计对制备的纳米金标记的RNase S样品的Poly C水解能力的测定及谱的测定 ,表明研究中使用的生物模型和RNaseA模拟得十分满意。空气浴中的封装空气样品的散热曲线呈现指数衰减规律 ,而空气样品的加热过程呈指数增加趋势。空气浴中的双蒸馏水样品的加热过程基本上是线性增加。但是 ,水浴的纳米金标记的RNase S样品的加热过程却基本上保持恒定值。结论　RF辐射在实验的条件下会由于被加热介质的不同热物理性质表现为不同的加热效果 ,对于含有纳米金属的微结构 ,可能会在局部产生微涡流发热。以纳米颗粒为热源的辐射热传导可能会和生物大分子的结构调整发生谐振从而不表现出样品整体宏观的升温。

关键词：纳米结构射频局部加热作用核糖核酸酶修饰物

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Gallbladder Disorders Detected by Ultrasound

引用

Open Journal of Medical Imaging 2014年第2期4卷 86-94页

作者： hamad Elniel H. Eltyib Adel M. Al-Garni Saddig D. Jastaniah Department of Diagnostic Radiology Faculty of Applied Medical Sciences King Abdulaziz University Jeddah KSA

Patients who have disease of the biliary tract commonly present with acute right upper quadrant pain, nausea or vomiting, mid-epigastric pain, and/or jaundice. Etiologies include inflammation with or without infection, noninflammatory disorders, and benign or malignant neoplasms of the gallbladder or bile ducts. Ultrasound (US) is now accepted as the initial imaging modality of choice for the work-up of suspected biliary tract disease. A retrospective study was carried out at King Abdulaziz University Hospital to discuss the protocol of ultrasound scanning in demonstrating incidence and complication of Gall-bladder (GB) pathologies. Known cases of GB pathologies (100 patients) were surveyed by ultrasound using spatial digital iU22 Philips Convex probe 3.5 MHz. All patients were evaluated with ultrasonogphy following the international scanning guidelines and protocols. The age of the patients is between (9 - 90) years, 68 Patients (68%) were females and 32 patients (32%) were males. Range of age group of accumulation for gallstone presence was (35 - 50) years in females and above 50 years in males. Incidence of gallbladder pathologies are 59% (female 46% and 13% male). Incidence of gallstone is 37%, and ratio of incidence is between male to female 1:3. Other pathologies of gallbladder were found to be acute cholecystities 12%, chronic cholocystities 5%, sludge 2%, carcinoma of the Gall-bladder 1%, Gall-bladder polyps 1% and Emphysematous choleycystities 1%. Ultransonography is a single imaging modality sufficient for evaluation of patient with suspected gallbladder pathologies (gallstone) which can provide information about the presence of gallstone and more over about site and cause of biliary tract obstruction. Ultrasound is highly sensitive and specific means for diagnosis of the gallbladder disorders.

关键词： Gallbladder Ultrsound Stones

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Esophageal Cancer in Sudan: Demographic and Histopathlogical Variations

引用

Open Journal of Gastroenterology 2017年第3期7卷 124-129页

作者： Asma Mahir hamad Mohamed Elbagir K. Ahmed Abdulfattah Abdelgadir Ikhlas B. Suliman Sunderland Royal Hospital Sunderland UK College of Medicine King Khalid University Abha KSA University of Medical Sciences & Technology Khartoum Sudan Ministry of Health Khartoum Sudan

Background: Sudan is experiencing a growing cancer problem. Esophageal cancer (EC) is a devastating disease with high mortality. Our objective was to study the demographic factors and histopathological pattern of EC cancer in Khartoum, Sudan. Methods: In a retrospective cross-sectional study, the records and histopathology reports of all patients diagnosed endoscopically as EC and who were referred to Zain center, a reference histopathology center in Khartoum Sudan, were studied over a 6-month period. Descriptive and simple statistics were used for analysis. Results: Out of 74 histopathologically studied patients, 66 (89.2%) had squamous cell (SCC) cancer (average age 59 y, mainly females) and 8 (10.8%) had adenocarcinoma (AC-average age 69 y). The female to male ratio is 1.5:1. In females with SCC, the tumors mainly located in the upper and middle thirds of the oesophagus. On the other hand, 6 out of the 8 patients with AC were men, with the tumors located mainly in the lower third. Conclusions: In Khartoum, Sudan, esophageal cancer affects females (predominantlySCC) more than males (predominantly AC). It occurs at a relatively young age, and is predominantly squamous cell in type. No specific risk factors were identified and this needs further studies.

关键词： Esophagus Cancer Histopathology Sudan

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：