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L形实验段中两相流空泡份额的差压测量方法研究

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L形实验段中两相流空泡份额的差压测量方法研究

作者： ANsARI talha QAsIm 华北电力大学(北京)

学位级别：硕士

空泡份额在两相流体积计算中是一个重要的过程变量。读数不准确,可能会导致数据和安全性的潜在损失。由于核工业上高安全标准,空泡份额是十分重要的。在内径为40mm的L形台架中,气水两相流由水平段流入竖直段台架,气体和液体速度分别从0... 详细信息

空泡份额在两相流体积计算中是一个重要的过程变量。读数不准确,可能会导致数据和安全性的潜在损失。由于核工业上高安全标准,空泡份额是十分重要的。在内径为40mm的L形台架中,气水两相流由水平段流入竖直段台架,气体和液体速度分别从0到0.1988m/s和0.2209m/s到0.6629m/s。分别测量泡状流和弹状流下的压降。水平测量段安装差压传感器,传感器两端的压力感应线长度为lm。竖直段安装有两个绝压传感器和一个差压传感器,压力感应线长度与水平段相同。通过与广泛接受的贝格＆布里尔和弗里德尔的相关关系,对实验的压降结果进行了验证。实验压降结果与贝格和布里尔的结果有±3%的误差。将由摩擦压降估测的空泡份额与流体的实际空泡份额进行比较。精确的测量通常因为侵入性(光学探针)或非侵入性(x射线)技术的昂贵成本而受到限制,该研究集中于低成本有效精确测量空泡份额的方法。实验结果表明,空泡份额可以使用垂直截面的绝对压力传感器进行准确估测,而差压传感器引压管内气泡的存在使差压传感器的读数有一些问题。

关键词：两相流空隙率压降

A study on directors＇ remuneration and board committee in malaysia

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Journal of modern Accounting and Auditing 2009年第1期5卷 34-44页

作者： mohammad talha Abdullah sallehhuddin Abdullah salim shukor masoud Department of Accounting ＆ mIs King Fahd University of Petroleum and Minerals Dhahran 31261 Saudi Arabia Faculty of Business ＆ Law Multimedia University Melaka 75450 Malaysia

Researches on company directors＇ remuneration and its links with firms＇ performance and corporate governance have drawn wide attention as stakeholders are interested to find out whether directors received the right package of remuneration and whether it is always in line with the firm＇s performance and corporate governance policy. However, there is a lack of study examining the impact of specific board committee on directors＇ remuneration, particularly in emerging capital and financial market. This study, involving 120 malaysian public listed companies, aims to examine this association. The study employs descriptive analysis, Pearson＇s correlation test and multivariate stepwise statistical technique. The result of the study indicates that there is a positive relationship between directors＇ remuneration with board executive committee, remuneration committee, nomination committee and corporate governance committee. The result also indicates negative relationship between directors＇ remuneration with employees share option scheme committee. However, all these associations are not significant, except ownership structure that is used as a control variable. This result prompts a need to reexamine the effectiveness of corporate governance practice through establishment of board committee in determining directors＇ remuneration.

关键词： directors' remuneration board of directors board committee corporate governance malaysia

The Dynamics of spreading of Oils on Hydrophilic and Hydrophobic surfaces Revisited Using Computational Fluid Dynamics

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材料科学与工程（中英文B版） 2013年第12期3卷 799-811页

作者： Badra Ali talha Hocine Alia somia Freifer Thibault Roques-Carmes Laboratoire de Physique des matdriaux Et des Fluides Universitd des Sciences et de la Technologic d'Oran BP 1505 ElM'Naouar Bir el Djir 31000 Oran Algeria Universite de Lorraine Laboratoire Reactions et Genie des Procedes UMR 7274 CNRS Nancy F-54000 France CNRs Laboratoire Reactions et Genie des Procedes UMR 7274 CNRS Nancy F-54000 France

synergistic antibacterial effect of honey and Herba Ocimi Basilici against some bacterial pathogens

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Journal of Traditional Chinese medicine 2013年第6期33卷 810-814页

作者： Ali talha Khalil Imran Khan Kafeel Ahmad Yusra Ali Khan momin Khan muhammad Jaseem Khan Department of Biotechnology Quaid-i-Azam University Centre of Biotechnology and microbiology University of Peshawar Institute of Paramedical sciences Khyber Medical University

OBJECTIVE： To evaluate the antibacterial activity of the combination of different honey brands and methanolic fraction of Herba Ocimi Basilici using agar well diffusion assay. mETHODs： The antibacterial activity was deter- mined against thirteen pathogenic bacterial clini- cal isolates including six gram negative （Klebsiella pneumonia, Pseudomonas aeroginosa, Escherichia coli, salmonella typhi, salmonella typhimirium, Xanthomonas campestris） and six gram positive strains （Enterococcus faecalis faecalis, Bacillus subti- lis, staphylococcus aureus, Clostridium perfringens type C, Clostridium perfringens type D, CIostridium chauvoei）. Agar well diffusion method was used while zones of inhibition were measured with verni- er scale. REsULTs： At higher concentration, all the honey brands showed good to significant activity. Thehighest activity was observed for Hamdard brand honey （27.60±0.40） against Enterococcus faecalis. CONCLUsION： These results revealed that combi- nations of plant extracts of Herba Ocimi Basilici with honey can be used for the development of potent and novel antibacterial agents.

关键词： Anti-infective agents Honey Gram-negative bacteria Gram-positive bacteria Well dif-fusion assay

Antibacterial activity of honey in north-west Pakistan against select human pathogens

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Journal of Traditional Chinese medicine 2014年第1期34卷 86-89页

作者： Ali talha Khalil Imran Khan Yusra Ali Khan Zabta Khan shinwari Kafeel Ahmad Jangrez Khan Department of Biotechnology Quaid-i-Azam University Centre of Biotechnology and microbiology University of Peshawar Department of Biochemistry Quaid-i-Azam University

OBJECTIVE:To investigate the antimicrobial activity of commercially available honey and raw honey samples in Khyber Pakhtunkhwa,Pakistan,against pathogenic bacterial ***:Well diffusion assays were performed to screen pure and diluted honey samples for antibacterial activity against six Gram-negative and six Gram-positive bacterial *** of inhibition were measured and compared with 10 mg ***:When honey samples were diluted to20%-70%,the honey samples showed no activity to mild antibacterial *** highest antibacterial activity was recorded when 90%and pure undiluted honey samples were tested and compared with a control Gentamycin disc(10 mg).CONCLUsION:Commercially processed honey and raw honey samples from north-west of Pakistan possess good antimicrobial potential.

关键词： Anti-bacterial agents Disk diffusion an-timicrobial tests Honey

Phytopharmacological evaluation of ethanol extract of sida cordifolia ***

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Asian Pacific Journal of Tropical Biomedicine 2014年第1期4卷 18-24页

作者： mohammad Abdul motalib momin sm Faysal Bellah sarder mohammad Raussel Rahman Ahmed Ayedur Rahman Gazi mohammad monjur murshid sarder mohammad saker Billah talha Bin Emran Department of Pharmacy Jahangirnagar University Department of Clinical Pharmacy and Pharmacology Dhaka University Pharmacy Discipline Life Science SchoolKhulna University Department of Chemistry Gort.M.M.University College Department of Pharmacy BGC Trust University

Objective:To investigate the phytochemical screening(group determination)and selected pharmacological activities(antioxidant,antimicrobial and analgesic activity)of the plant sida cordifolia Linn(***).methods:Eighty percent concentrated ethanol extract of the roots was *** identify the chemical constituents of plant extract standard procedures were *** phytochemical screening the crude extract was tested for the presence of different chemical groups like reducing sugar,tannins,saponins,steroids,flavonoids,gums,alkaloids and *** antioxidant property of ethanolic extract of *** was assessed by DPPH free radical scavenging *** activity of the extract was tested using the model of acetic acid induced writhing in *** sodium is used as reference standard drug for the analgesic activity test Antibacterial activity of plant extract was carried out using disc diffusion method with five pathogenic bacteria comparison with kanamycin as a ***:Phytochemical analysis of the ethanolic extract of the roots of *** indicated the presence of reducing sugar,alkaloids,steroids and *** DPPH scavenging assay the IC_(50)value was found to be 50 ug/mL which was not comparable to the standard ascorbic *** crude extract produced 44.3%inhibition of writhing at the dose of 300 mg/kg body weight which is statistically significant(P>0.001).The in vitro antimicrobial activity of the ethanol extract of the roots of *** showed no antimicrobial activity against five types of *** experiment was conducted only with five species of bacteria as test species,which do not at all indicate the total inactivity against ***:The obtained results provide a support for the use of this plant in traditional medicine but further pharmacological studies are required.

关键词： Antioxidant Antimicrobial Analgesic DPPH Phytochemical screening

Response of Contrasting Rice Genotypes to Zinc sources under saline Condition

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Phyton-International Journal of Experimental Botany 2023年第5期92卷 1361-1375页

作者： muhammad Jan muhammad Anwar-Ul-Haq talha Javed sadam Hussain Ilyas Ahmad muhammad Ashraf sumrah Javed Iqbal Babar Hussain Babar Aqsa Hafeez muhammad Aslam muhammad Tahir Akbar marjan Aziz Khadiga Alharbi Izhar Ullah Department of soil and Environmental sciences Ghazi UniversityDera Ghazi Khan32200Pakistan Institute of soil and Environmental sciences University of AgricultureFaisalabad38040Pakistan Department of Agronomy University of AgricultureFaisalabad38040Pakistan College of Agronomy Northwest A&F UniversityYangling712100China Pesticide Quality Control Lab MultanPunjab59300Pakistan Barani Agricultural Research Institute Chakwal48800Pakistan soil and Water Testing Laboratory for Research Dera Ghazi Khan32200Pakistan Agronomic Research Institute Ayub Agricultural Research InstituteFaisalabad38000Pakistan Department of Plant sciences Quaid-i-Azam UniversityIslamabad45320Pakistan soil Fertility(Field) Multan59300Pakistan Department of Biology College of SciencePrincess Nourah bint Abdulrahman UniversityP.O.Box 84428Riyadh11671Saudi Arabia Queensland University of Technology QueenslandAustralia

Abiotic stresses are among the major limiting factors for plant growth and crop *** these,salinity is one of the major risk factors for plant growth and development in arid to semi-arid *** of salt tolerant crop genotypes is one of the imperative approaches to meet the food demand for increasing *** current experiment was carried out to access the performance of different rice genotypes under salinity stress and Zinc(Zn)*** rice genotypes were grown in a pot experiment and were exposed to salinity stress(7 ds m^(−1)),and Zn(15 mg kg^(-1)soil)was applied from two sources,ZnsO4 and Zn-EDTA.A control of both salinity and Zn was kept for *** showed that based on the biomass accumulation and K^(+)/Na^(+)ratio,KsK-133 and BAs-198 emerged as salt tolerant and salt sensitive,***,based on the Zn concentration,BAs-2000 was reported as Zn-in-efficient while IR-6 was a Zn-efficient *** results also revealed that plant growth,relative water content(RWC),physiological attributes including chlorophyll contents,ionic concentrations in straw and grains of all rice genotypes were decreased under salinity ***,salt tolerant and Zn-in-efficient rice genotypes showed significantly higher shoot K^(+)and Zn concentrations under saline *** application significantly alleviates the harmful effects of salinity by improving morpho-physiological attributes and enhancing antioxidant enzyme activities,and the uptake of K and *** beneficial effect of Zn was more pronounced in salt-tolerant and Zn in-efficient rice genotypes as compared with salt-sensitive and Zn-efficient *** sum,our results confirmed that Zn application increased overall plant’s performance under saline conditions,particularly in Zn in-efficient and tolerant genotypes as compared with salt-sensitive and Zn efficient rice genotypes.

关键词： Agronomic efficiency antioxidant enzymes:physiology Oryza sativa salinity Zn efficient

探测激子极化激元在超薄范德华微晶中的光传播

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Chinese Journal of Chemical Physics 2024年第1期37卷 35-42,I0001-I0004,I0117页

作者： talha Ijaz 边琦曹琰丁皓璇陈晓瑞卢欢杨树邢雪婷方思敏刘孟源张鑫高健智潘明虎陕西师范大学物理学与信息技术学院西安710062 华中科技大学物理学院武汉430074 洛阳师范大学物理与电子信息学院洛阳英国伯明翰大学物理与天文学院伯明翰B152TT 西安文理学院机械与材料工程学院西安710065 陕西师范大学地理与旅游学院西安710119 复旦大学信息科学与工程学院上海200433 珠海复旦创新研究院珠海519000 西北大学物理学院西安710069

激子极化激元是一种准粒子,过渡金属二硫族化合物材料即使在室温下也能支持传播激子极化子,是非常好的纳米光子学研究平台.已有研究表明,通过散射型扫描近场光学显微镜可以对过渡金属二硫族化合物薄片中激子极化激元进行实空间探测,但... 详细信息

激子极化激元是一种准粒子,过渡金属二硫族化合物材料即使在室温下也能支持传播激子极化子,是非常好的纳米光子学研究平台.已有研究表明,通过散射型扫描近场光学显微镜可以对过渡金属二硫族化合物薄片中激子极化激元进行实空间探测,但波导厚度仅限于低至30 nm.本文采用三种不同波长的入射光(1550和1064 nm的近红外以及633 nm的可见光),通过基于原子力显微镜的散射型扫描近场光学显微镜测量,探测到mos2和Wse2薄片中激子极化子普通横电模式的纳米光学成像.在厚度分别低至~3 nm(相当于4原子层)和~8 nm(相当于12原子层)的超薄mos2和Wse2薄片上,可以清楚地观察到干涉条纹图案,大大打破了之前的测量厚度限制.当厚度接近几个原子层时,波矢量始终保持在1.6k0~1.7k0左右,而不是理论预言的1k0.这些模式的特性表明,体系是由近乎悬浮的过渡金属二硫族化合物薄片的三层对称波导构成,其对激子极性子的传播产生限域效应.研究结果为探索基于超薄过渡金属二硫族化合物材料的近红外区极化器件提供了深入的理解和开辟了新的途径.

关键词：二维过渡金属二硫族化合物材料散射型扫描近场光学显微镜激子极化子

活性赤泥-聚吡咯复合材料对活性黄-145染料的吸附研究

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水处理技术 2024年第5期50卷 47-53页

作者： muhammad talha majeed 李扬 Hammad saulat 吴博文李攀钰胡浩权大连理工大学化工学院煤化工研究所辽宁大连116024

染料是一种结构复杂、具有剧毒的有机化合物,对人体毒害作用大。本研究制备了一种基于活性赤泥(activated red mud,ARm)和聚合吡咯(polypyrrole,PPy)的吸附剂,并应用于水溶液中染料的吸附脱除。通过吸附实验研究了溶液pH、吸附剂种类、... 详细信息

染料是一种结构复杂、具有剧毒的有机化合物,对人体毒害作用大。本研究制备了一种基于活性赤泥(activated red mud,ARm)和聚合吡咯(polypyrrole,PPy)的吸附剂,并应用于水溶液中染料的吸附脱除。通过吸附实验研究了溶液pH、吸附剂种类、吸附时间、添加量和染料初始浓度对吸附过程的影响,并对ARm-PPy复合材料进行分析表征,阐明了活性黄染料-145(RYD-145)的吸附作用机制。RYD-145在ARm-PPy上的吸附过程与三种吸附等温线关联极好(R2>0.99),其中Langmuir吸附最合适。根据Langmuir吸附模型的拟合结果,RYD-145的最大吸附量是442.5 mg/g。热力学研究表明,RYD-145分子在ARm-PPy的吸附过程中,焓变(ΔH)和熵变(Δs)均增加,这表明该过程为吸热过程,且表面RYD-145分子排列具有随机性。研究表明,ARm-PPy具有高效处理阴离子和阳离子染料污染废水的能力,且具有较好的成本效益。

关键词：吸附染料赤泥活性黄染料-145 聚吡咯