在废水处理过程中基于过程分析技术的多重响应优化（英文）     

Abbas AL-REFAIE 《浙江大学学报(A卷英文版)》2014,(5)

研究目的:基于过程分析技术框架,优化家禽业的废水处理工艺的性能。研究方法:生产商主要关注浊度和污泥容积指数(SVI)这两个响应。首先为每个响应建立移动平均(MA)和移动范围(MR)控制图,并在实验工作中重复两次33全因子设计。基于模糊目标规划建立加权相加模型,并用于确定最佳的因子设置组合。最后,在最佳的因子设置组合条件下,对实验结果进行跟踪确认。重要结论:在絮凝剂为18 mg/L、凝结剂为40.0 mg/L和p H=4.0的最佳工艺条件下,得到的浊度和污泥体积指数的最佳值分别为6.184 NTU和73.21 ml/g。在此条件下得到的浊度和污泥沉降指数能够满足设计要求,它们的过程变异性分别显著下降了41.22%和77.75%,且多重能力指数从1.95显著增加至10.6。这表明此过程可行性很高。总之,加权相加模型是一种用于优化多个响应流程性能的有效技术,并且可以考虑工程师的首选设置流程。  相似文献   

在废水处理过程中基于过程分析技术的多重响应优化     

Abbas AL-REFAIE 《浙江大学学报(A卷英文版)》2014,15(5):374-384

研究目的：基于过程分析技术框架,优化家禽业的废水处理工艺的性能。研究方法：生产商主要关注浊度和污泥容积指数（SVI）这两个响应。首先为每个响应建立移动平均（MA）和移动范围（MR）控制图,并在实验工作中重复两次3。全因子设计。基于模糊目标规划建立加权相加模型,并用于确定最佳的因子设置组合。最后,在最佳的因子设置组合条件下,对实验结果进行跟踪确认。重要结论：在絮凝剂为18mg／L、凝结剂为40．0mg／L和pH=4．0的最佳工艺条件下,得到的浊度和污泥体积指数的最佳值分别为6．184NTU和73．21ml／g。在此条件下得到的浊度和污泥沉降指数能够满足设计要求,它们的过程变异性分别显著下降了41．22％和77．75％,且多重能力指数从1．95显著增加至10．6。这表明此过程可行性很高。总之,加权相加模型是一种用于优化多个响应流程性能的有效技术,并且可以考虑工程师的首选设置流程。  相似文献   

University libraries response to COVID-19 pandemic: A developing country perspective     

Muhammad Rafiq  Syeda Hina Batool  Amna Farzand Ali  Midrar Ullah 《The Journal of Academic Librarianship》2021,47(1):102280

The purpose of this study was to explore the university libraries' response during the COVID-19 pandemic and determine their working practices, services patterns, strategies applied, and role played. This study is a qualitative exploration by collecting data through in-depth interviews of purposely selected Heads of seven university libraries. The interview recordings were transcribed, translated, and analyzed thematically. The majority of the university libraries were physically closed for patrons in this pandemic but engaged with the users. Libraries revamped their web pages, reassigned resources, and planned robust online offerings. The university portal and other social media tools were less used communication tools during the pandemic. Library staff worked from home and there was a sense of over burden because of 24/7 connectivity and without any formal working policy addressing the new working routines. University librarians felt that digital divide, lack of digital literacy skills, and slow internet speed were the major barriers in their transition from physical to online mode and less use of library's online resources and web portals. Libraries see their individual and collective roles of societal and educational dimensions during these uncertain times. The study also made recommendations for the betterment of libraries' role in such situations.  相似文献   

Manipulating Spin Polarization of Defected Co3O4 for Highly Efficient Electrocatalysis     

Li  Yue  Wang  Tianzuo  Asim  Muhammad  Pan  Lun  Zhang  Rongrong  Huang  Zhen-Feng  Chen  Zhichao  Shi  Chengxiang  Zhang  Xiangwen  Zou  Ji-Jun 《天津大学学报(英文版)》2022,28(3):163-173

Transactions of Tianjin University - Electrocatalytic water splitting is limited by kinetics-sluggish oxygen evolution, in which the activity of catalysts depends on their electronic structure....  相似文献   

Technology Usage for Education： Comparative Analysis Between Open and Distance Learning and Regular Students     

Hina Fatima  Fahad Anis  Hafiz Muhammad Umar Farooq 《美中教育评论》2014,(6):417-422

Education is the backbone for the development of society. With the advent of technology, it is becoming necessary and being used for the advancement of society. Technology is being used for education as being used in other important fields of life. Usage of technology for education can play a big part in bringing improvement in education For this purpose, this research aims to explore the usage and effects of technology for education. While using the survey method, a questionnaire was constructed for data collection. The sample of the study consists of graduate and postgraduate students from both ODL and regular universities and the sample size would be of 300 respondents （150 from each type of university） who were selected by using simple random sampling. The present study concluded that technology is widely used by both regular and ODL students. This study further concluded that ODL students are more dependent on technology as compared to regular students.  相似文献   

An investigation of the Gregorian chronology of early Islamic history : A Pilot Study     

Shaykh Muhammad al‐casnazāni al‐Husseini  Jamāl N. Hussein  Shetha al‐Dargazelli  Hamid M. An‐Ni'aymi  Louay J. Fatoohi 《Al-Masaq: Islam & the Medieval Mediterranean》1994,7(1):227-266

This pilot study presents a lunar and Gregorian chronology of the Sira, that is the biography of the prophet Muhammad. The paper discusses the problems surrounding the chronology of very early Islamic history, namely, the pre‐Hijra era. This history is not covered by the Hijra calendar, and therefore, historians dated its events using other primitive dating systems, resulting in considerable difficulties and inaccuracies when comparing Gregorian dates of this early Islamic history. In order to overcome this problem and establish an accurate chronology of the early Islamic history, the introduction of a new lunar calendar (the Muhammadi calendar) which starts with the birth month and year of the prophet Muhammad, and covers all Islamic history including the pre‐Hijra era, is suggested. The Muhammadi calendar was used to study the earliest three versions of the Sira. All dated events of the Sira were compiled from these sources and presented, for the first time, according to their historical order. The Muhammadi dates of these events were then calculated. For the first time, a computer program was designed to convert the Muliammadi dates to their Christian equivalent. The program was then used to compute the Gregorian dates of the events of the Sira.  相似文献   

Telling Them Their Own Stories: Legitimizing sexual and reproductive health education in rural Bangladesh     

Kathleen Cash  Sharful Islam Khan  Hashima-E-Nasreen  Abbas Bhuiya  Sadia Chowdhury  A. Mushtaque R. Chowdhury 《Sex education》2013,13(1):43-57

Most people in Bangladesh are rural, poor and underprivileged. The incidence of sexual disease has increased, but little has been done to educate rural people about sexual and reproductive health. In 1997, a sexual and reproductive health project was initiated within a collaborative research agreement between the International Centre for Diarrhoeal Disease Research (ICDDR,B) and the Bangladesh Rural Advancement Committee (BRAC), an indigenous non-governmental organization which pursues integrated rural development strategies. Qualitative in-depth interviews with 65 different women, men, boys and girls revealed significant sexual health problems and a lack of knowledge of sexual and reproductive health. The interviews were transformed into composite problem-solving picture stories and information about sexual and reproductive health. Stories mirrored respondents' interpretations of sexual behavior. Those who had achieved or ascribed legitimacy to talk about sex, e.g. traditional health providers, were trained to utilize the methods and materials. Qualitative evaluations revealed important changes in health providers' self-confidence, business and personal interactions as well as changes in clients' behavior. This project found that sexual and reproductive health education can be integrated into indigenous health activities if the sociocultural context in which sex, relationships, risks, diseases and communication occur is reflected in a program's content and methods. Unquestionably, there is a great need for sex education in rural Bangladesh.  相似文献   

Robust stabilization of uncertain 2-D discrete-time delayed systems using sliding mode control     

Imran Ghous  Zhaoxia Duan  Jahanzeb Akhtar  Muhammad Jawad 《Journal of The Franklin Institute》2019,356(16):9407-9431

This paper aims to solve the problem of sliding mode control for an uncertain two-dimensional (2-D) systems with states having time-varying delays. The uncertainties in the system dynamics are constituted of mismatched uncertain parameters and the unknown nonlinear bounded function. The proposed problem utilizes the model transformation approach. By segregating the proper Lyapunov–Krasovskii functional in concert with the improved version of Wirtinger-based summation inequality, sufficient solvability conditions for the existence of linear switching surfaces have been put forward, which ensure the asymptotical stability of the reduced-order equivalent sliding mode dynamics. Then, we solve the controller synthesis problem by extending the recently proposed reaching law to 2-D systems, whose proportional part is appropriately scaled by the factor that does not depend on some constant terms but rather on current switching surface’s value, which in turn ensures the faster convergence and better robustness against uncertainties. Finally, the proposed results have been validated through an implementation to a suitable physical system.  相似文献   

Terrorism in the Backyard: Coverage of London Attacks, 2005 by the British TV News Channels     

Muhammad Zubair Iqbal 《广播与电子媒介杂志》2017,61(2):449-466

The media-terrorism nexus needs further exploration. This article is a qualitative analysis of the coverage of London Attacks, 2005 by the British TV news channels. It aims to investigate and to empirically ascertain the veracity of the media-terrorism-symbiotic-relationship notion. The research draws a comparison with a similar study of the coverage of Mumbai attacks, 2008 and maintains that when the terrorist event happens on British soil, the symbiotic relationship theory is not verified completely. It concludes that British TV news channels, while reporting the home event of terrorism, do not overly focus on the theme of awe and terror. Instead, they are more responsible, careful, and nationalistic while covering the events of terrorism.  相似文献   

香草醛缩色氨酸与稀土镧、钕、钐、铈配合物的合成及表征     

阿米娜·买买提 《喀什师范学院学报》2002,23(6):39-42

合成了香草醛缩色氨酸席夫碱(简写为L)及其稀土La(III)、Nd(III)、Sm(III)、Ce(III)配合物,通过元素分析、摩尔电导、差热-热重分析、红外光谱、紫外光谱等手段.确定配合物为KRe(H2O)(NO3)·2H2O(Re=La,Nd,Sm,Ce).  相似文献