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Cladding Modified Fiber Bragg Grating for Copper Ions Detection

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Semiconductor Science and Information Devices 2021年第2期3卷 12-16页

作者： husam abduldaem mohammed Aqiel Almamori Ali A.Alwahib Electronic and Communication Engineering Department College of EngineeringUniversity of BaghdadBaghdad47202Iraq Department of Laser and Optoelectronics Engineering University of TechnologyBaghdad47202Iraq

This paper reports a fiber Bragg grating(FBG)as a *** FBGs were etched using a chemical agent,namely,hydrofluoric acid(HF).This implies the removal of some part of the cladding ***,the evanescent field propagating out of the core will be closer to the environment and become more sensitive to the change in the *** proposed FBG sensor was utilized to detect toxic heavy metal ions aqueous medium namely,copper ions(Cu^(2+)).Two FBG sensors were etched with 20 and 40μm diameters and *** sensors were studied towards Cu^(2+)with different concentrations using wavelength shift as a result of the interaction between the evanescent field and copper *** FBG sensors showed a good response in terms of significant wavelength shift in corresponding to varying Cu2+concentrations when immersed in aqueous *** sensors exhibited excellent repeatability towards Cu *** results demonstrate that the smaller FBG etching diameter,the better optical response in terms of wavelength and linearity.

关键词： Fiber Bragg grating Optical fiber sensors Etched fiber C-band D-heavy metals

Analytic Hierarchy Process for Evaluating Flipped Classroom Learning

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Computers, Materials & Continua 2021年第3期66卷 2229-2239页

作者： husam Jasim mohammed Hajem Ati Daham Department of Business Administration College of Administration Sciences and FinancialImam Ja’afar Al-Sadiq UniversityBaghdadIraq Department of Mathematics College of Education for Pure ScienceAl-Muthana UniversityAl MuthannaIraq

In reality,the flipped classroom has gained popularity as a modern way of structuring teaching,where lectures move from in-class procedures to digitally-based assignments,freeing up the debate,and practice exercises class ***,it is essential to implement and analyze a way of teaching that will improve student *** paper aims to develop a model of the method of teaching science in Iraqi schools,and to assess whether teaching flipped classroom affects the achievement,motivation,and creative thinking of students by using the methodology of Multi-Criteria Decision Making(MCDM)in the Analytic Hierarchy Process(AHP).The AHP approach includes several steps,including setting assessment criteria and their weights,and by assessing the methodology of the flipped classroom as compared to the conventional cognitive learning *** experiment was carried out in Iraqi secondary schools to examine the attitude of the students towards the subject of *** findings have indicated that the students and teachers favored flipped classroom learning more than conventional cognitive *** study took the following parameters compared to the traditional approach:teaching techniques,learning flexibility,teaching aids effectiveness,student participation and working *** paper indicates that the teachers in Iraqi schools will be able to improve and do more preparation to shift towards flipped learning in the classroom.

关键词： Analytic hierarchy process flipped classroom criteria weights comparative analysis

汉语国际教育硕士生中华文化素养提高途径探索 ——以浙江师范大学来华留学生为例

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汉语国际教育硕士生中华文化素养提高途径探索 ...

作者： ALMUALLEMI husam YAHYA mohammed AHMED 绍兴文理学院

学位级别：硕士

在当前对外交流日益频繁的形势下,汉语国际教育硕士的中华文化素养培养变得越来越重要和必要,而对来华留学生进行文化素养的培养是一件非常困难的事情。留学生们母语国文化背景与中华文化背景掺杂在一起,使得中华文化素养的培养和提升... 详细信息

在当前对外交流日益频繁的形势下,汉语国际教育硕士的中华文化素养培养变得越来越重要和必要,而对来华留学生进行文化素养的培养是一件非常困难的事情。留学生们母语国文化背景与中华文化背景掺杂在一起,使得中华文化素养的培养和提升变得更为不易。随着世界各国对外汉语教育教师的需求量的不断增加,汉语国际教育硕士中华文化素养的培养和提高迫在眉睫,提高其综合文化素质,让他们成为合格的汉语国际宣传使者,高品质地完成汉语国际传播任务,成为了一项重要的研究内容。本文作者通过对相关研究资料进行梳理和总结,调查来华留学生的中华文化素养情况。通过问卷调查,收集了浙江师范大学50名留学生的相关数据,分析了来中国留学生的中华文化素养的一些实际情况。通过层次等级分析法,陈述了中华文化素养的一些现状和对留学生中华文化培养支持因素的影响。支持因素有文化认同、个人文化素养、专业选择等。结果表明,来华留学生在中华文化素养基本上是中等水准,不同的群体之间存在着明显的差异,这对留学生们在中华文化素养和支持因素都有着很大的影响。文章还探讨汉语国际教育硕士生在提升自身中华文化素养方面的一些方法。说明在汉语国际教育的宣传和推进中,不仅需要改善和提高汉语国际教育硕士的中华文化素养的问题,也需要研究汉语国际教育硕士在宣传中华文化素养方面的方法和渠道。有助于中华文化在国际上的宣传和汉语文化教育由中国走向国际,并为其在教学方式上提供一些有效帮助。

关键词：文化素养来华留学生汉语国际教育

Evaluation of Heavy Metal Concentrations in Soil and Edible Vegetables Grown in Compost from Unknown Sources in Al-Jiftlik, Palestine

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Journal of Environmental Protection 2022年第1期13卷 112-125页

作者： mohammed Bawwab Ahmad Qutob Mahmoud Al Khatib husam Malassa Ayman Shawahna Mutaz Qutob Department of Materials Engineering Faculty of Engineering Al-Quds University Jerusalem Palestine Department of Electrical Engineering Faculty of Engineering Al-Quds University Jerusalem Palestine Department of Chemistry and Chemical Technology Al-Quds University Jerusalem Palestine Environment Quality Authority Al-Bireh Palestine

The use of compost as a fertilizer has been widely used in many countries. However, compost that contains heavy metals can transfer these metals to soils and plants (vegetables). This study investigates the concentrations of metals in soil and edible vegetables that were fertilized by polluted unknown compost in Al-Jiftlik region (Palestine). The source of the compost is the autocratic dumping sites of the Israeli settlements. The compost is distributed free of charge to the Palestinian farmers. The concentrations of Ba, Cu, Pb, Th, Se, Mn, Co and As in the contaminated farms were measured. Vegetables include: Eggplant, Corn, Bell Pepper, Cucumber and Marrow. Metals availability as well as the pH, was also examined in the soil samples. Normal farms that did not use this unknown compost were used as a reference. The concentrations of Ba, Cu, Pb, Th, Se, Mn, Co and As in soil and vegetables in the polluted farms were above the WHO limits. Barium concentrations in the vegetables were ranged from 1.00 mg/kg to 0.453 mg/kg. It is high when compared to WHO limit of 0.3 mg/kg. Copper concentrations in the vegetables were ranged from 63.84 mg/kg to 50.53 mg/kg. It is high when compared to WHO limit of 40 mg/kg. Lead concentrations in the vegetables were ranged from 1.00 mg/kg to 0.453 mg/kg. Lead concentration is high when compared to WHO limit of 0.3 mg/kg. Thallium concentrations in the vegetables were ranged from 2.99 mg/kg to 1.22 mg/kg. Thallium concentration is high when compared to WHO limit of 0.3 mg/kg. Selenium concentrations in the vegetables were ranged from 0.550 mg/kg to 0.348 mg/kg. It is high when compared to WHO limit of 0.3 mg/kg. Manganese concentrations in the vegetables were ranged from 825.3 mg/kg to 446.2 mg/kg. It is almost high when compared to WHO limit of 500 mg/kg. Cobalt concentrations in the vegetables were ranged from 1.119 mg/kg to 0.522 mg/kg. Cobalt concentration is high when compared to WHO limit of 0.1 mg/kg. A

关键词： Compost Heavy Metals Vegetables Autocratic Dumping