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BaZrO3耐火材料与锆合金熔体的界面反应机理探究

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稀有金属与硬质合金 2017年第6期45卷 76-80页

作者：李宝同康菊芸李柱陈光耀 ali wajid 秦子威李重河鲁雄刚省部共建高品质特殊钢冶金与制备国家重点实验室上海市钢铁冶金新技术开发应用重点实验室上海大学材料科学与工程学院上海200072 上海大学材料基因研究院上海200072 上海特种铸造工程技术研究中心上海201605

使用BaZrO_3坩埚真空感应熔炼了Zr-4合金,采用SEM、EDS、XRD等方法分析了坩埚与合金熔体间的界面反应并对反应机理进行探究。结果表明,熔炼后BaZrO_3坩埚结构依旧完整,合金熔体与BaZrO_3耐火材料间发生一定程度的润湿,但坩埚与合金间未... 详细信息

使用BaZrO_3坩埚真空感应熔炼了Zr-4合金,采用SEM、EDS、XRD等方法分析了坩埚与合金熔体间的界面反应并对反应机理进行探究。结果表明,熔炼后BaZrO_3坩埚结构依旧完整,合金熔体与BaZrO_3耐火材料间发生一定程度的润湿,但坩埚与合金间未观察到明显的界面反应层,仅存在约20μm的渗透层。

关键词：锆酸钡锆合金感应熔炼合金熔体界面反应

Syntheses,Spectral Studies and Bioanalyses of Some Triorganotin(IV) Complexes of Cephlaxine

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Chinese Journal of Structural Chemistry 2008年第7期27卷 846-852页

作者： wajid Rehman Bakhtiar Muhammad Farman ali Sardar Atif Department of Chemistry Hazara University MansehraPakistan

Five novel triorganotin（IV） complexes have been synthesized by refluxing trimethyl, triethyl, tributyl, triphenyl and tribenzyltin chloride with Cephlaxine. These compounds were characterized by spectroscopic （IR, IH, 13C, 119Sn NMR） techniques and elemental analysis. The results obtained through these techniques are in full agreement with the proposed 1：1 stoichiometry. The synthesized compounds were than tested against various microorganisms and fungi. The results of new products obtained showed that the triphenyltin（IV） complex displayed promising activity against all types of bacteria and fungi used while all other compounds showed significant antibacterial and antifungal activity.

关键词： cephlaxine spectra triorganotin activity bacteria

A decline in snow cover area of Passu and Ghulkin valleys between 1995 and 2022

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Journal of Mountain Science 2023年第12期20卷 3542-3551页

作者： Imran HUSSAIN Mumtaz ali Sher MUHAMMAD wajid HASSAN Salar ali Zakir HUSSAIN Syed Hammad ali Shaukat ali Muhammad Younis KHAN Department of Environmental Sciences University of BaltistanSkardu 16100Pakistan Micromaps IT and GIS Consultancy LLC 26135UAE International Centers for Integrated Mountain Development(ICIMOD) G.P.O.Box 3226KathmanduNepal Institute of Mountain Hazards and Environment Chinese Academy of SciencesChengdu 610041China University of Chinese Academy of Sciences Beijing 100049China Glacier Monitoring Research Centre(GMRC) Water and Power Development Authority(WAPDA)Lahore 54000Pakistan SickKids Centre for Global Child Health The Hospital for Sick ChildrenTorontoOntario M5G 2L3Canada Global Change Impact Studies Center(GCISC) Islamabad 44000Pakistan Departments of Earth Sciences College of ScienceSultan Qaboos UniversityMuscat 123Oman National Centers of Excellence in Geology(NCEG) University of PeshawarPeshawar 25130Pakistan

The global cryosphere is experiencing accelerated melting due to climate ***,the Karakoram anomaly is under discussion with a debate about the possibility that the anomaly may have recently *** study aims to evaluate the up-to-date changes in snow cover in the western Karakoram *** observed the snow cover changes in Passu and Ghulkin valleys in the Hunza River basin(HRB)of the Karakoram through multitemporal Landsat satellite data between 1995 and *** found a significant reduction in snow cover in these valleys,with an average reduction rate of 0.42 km~2/yr,resulting in a total reduction of~11.46 km~2 between 1995 and *** reduction in snow cover is consistent with the mass loss of glaciers in the Karakoram region in recent *** decline in snow cover in these valleys is also consistent with the meteorological *** temperature in summer(June)has significantly increased whereas the precipitation in the accumulation season(March)has *** rapid changes suggest that it is crucially important to monitor the snow cover on a regular basis to support downstream management of snowmelt *** addition,there is a need of planning for mitigation and adaptation strategies for snow-related hazards.

关键词： Cryosphere Snow covers area Climate change Karakoram

Effect of type 2 diabetic serum on the behavior of Wharton's jelly-derived mesenchymal stem cells in vitro

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Chronic Diseases and Translational Medicine 2017年第2期3卷 -页

作者： Fatima ali Fehmina Aziz Nadia wajid Institute of Molecular Biology and Biotechnology (IMBB)&Centre for Research In Molecular Medicine (CRIMM) The University of LahoreRaiwind RoadLahorePakistan

Objective: Wharton jelly-derived mesenchymal stem cells (WJMSCs) exhibit multilineage differentiation potential and can be used to treat multiple organs. However, diabetes affects the repair capability of MSCs. The aim of this study was to evaluate the effect of diabetic patient-derived serum on WJMSC behavior. Methods: WJMSCs at passage 3 were treated with serum derived from type 2 diabetic patients. WJMSCs were characterized for surface markers expression by using immunocytochemistry technique. The effects on cell viability, proliferation, cell death rate, and vascular endothelial growth factor level were assessed by crystal violet staining, 3-(4, 5-dimethylthiazol-2-yl)-2, 5-diphe-nyltetrazolium bromide (MTT) assay, lactate dehydrogenase assay, and enzyme-linked immuno-sorbent assay, respectively. Oxidative stress was assessed by the estimation of free radical species malondialdehyde (MDA) and enzymes glutathione (GSH), catalase, and superoxide dismutase (SOD). Results: WJMSCs isolated in this study were positive for CD29, CD49, CD73, CD90, CD105, and SSEA4 and negative for CD45 and CD34. Under diabetic stress conditions, WJMSCs showed low viability and high lactate dehydrogenase release. A low level of vascular endothelial growth factor was also observed after diabetic serum treatment. Antioxidant level was also lower in diabetic serum-treated WJMSCs compared to in normal serum-treated WJMSCs. Conclusion: The results of the present study suggest that pre-treatment of WJMSCs with type 2 diabetic serum decreases the survival of WJMSCs. The findings of this study provide insight into diabetes-induced harmful effects on WJMSCs.

关键词： Wharton jelly-derived mesenchymal stem cells Type 2 diabetes mellitus Oxidative stress Vascular endothelial growth factor

Characterization of lipid parameters in diabetic and non-diabetic atherosclerotic patients

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Journal of Geriatric Cardiology 2015年第1期12卷 37-43页

作者： Fatima ali Hassan Jamil Sanam Saiqa Anwar Nadia wajid Institute of Molecular Biology and Biotechnology (IMBB) & Centre for Research in Molecular Medicine (CRIMM) University of Lahore 1-Kin Defence Road Lahore Pakistan

Background ＆ Objective The relationship between lipid profile perturbation and diabetes associated complications has long been an area of interest. Dyslipidemia is a potent predictor of cardiovascular morbidity and mortality in diabetic patients. The aim of present study was to investigate relationship between aging and lipid profiles in diabetic and non-diabetic atherosclerotie patients. Methods Five hundred and seventy six individuals （45-75 year age） participated in this study. Among these, 192 were having history of diabetes mellitus and atherosclerosis. Individuals are categorized on the base of health （normal, non-diabetic atheroselerosis, diabetic atherosclerosis） and age （45-55 years, 56~55 years, and 66-75 years）. All the participants were subjected to the procedures like a detailed history, biochemical analysis for fasting blood sugar, hemoglobin Alc, total cholesterol （TC）, triglycerides （TG）, low-density lipoprotein-（LDL）, very low-density lipoprotein （VLDL） and high-density lipoprotein （HDL）. All these parameters were compared between diabetic and non-diabetic atherosclerotic patients of all three age groups. TC/HDL and LDL/HDL were also calculated. Results Diabetic atherosclerotic individuals （both males and females） had high level of TC, TG, LDL, VLDL and low level of HDL in comparison to non-diabetic atherosclerotie and normal control individuals. Among all three age groups, lipoprotein abnormality was observed to be more frequent in females than males. There was a significant increase in TC/HDL and LDL/HDL ratio in diabetic atherosclerotic subjects compared to age and sex matched non-diabetic atherosclerotic and normal control. Conclusions Degree of dyslipidemia increases with increase in age in both genders. Female are more prone to diabetic dyslipidemia and hence have more risk of developing atherosclerosis with increasing age.

关键词： Aging Atherosclerosis Diabetes Dyslipidemia

Impact of glacier changes and permafrost distribution on debris flows in Badswat and Shishkat catchments,Northern Pakistan

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Journal of Mountain Science 2023年第12期20卷 3687-3702页

作者： HASSAN wajid SU Feng-huan LIU Wei-ming HASSAN Javed HASSAN Muzammil BAZAI Nazir Ahmed WANG Hao YANG Ze-wen ali Muzaffar CASTELLANOS Daniel Garcia Institute of Mountain Hazards and Environment Chinese Academy of SciencesChengdu 610041China China-Pakistan Joint Research Center on Earth Sciences CAS-HECIslamabad 45320Pakistan University of Chinese Academy of Sciences Beijing 100049China DTU Space Technical University of DenmarkKongens Lyngby 2800Denmark Department of Environmental Science Karakoram International UniversityGilgit-Baltistan 15100Pakistan Key Laboratory of Mountain Hazards and Earth Surface Process Institute of Mountain Hazards and EnvironmentChinese Academy of SciencesChengdu 610041China Instituto de Ciencias de la Tierra Jaume Almera ICTJA-CSICSoléi Sabarís s/nBarcelona 08028Spain

Knowledge of glacier changes and associated hazards is of great importance for the safety consideration of the population and infrastructure in the mountainous regions of Upper Indus Basin(UIB).In this study,we assessed the variations in glacier velocity,glacier surface elevation change,meteorological conditions,and permafrost distribution in Badswat and Shishkat catchments located in UIB to access the potential impact on the occurrence of debris flow in both *** find that the glacier surface velocity increased during the debris flow event in the Badswat catchment and the mean daily temperature was 3.7℃to 3.9℃higher in most of the *** enhanced glacier surface elevation lowering period coincide with the rise in temperature during spring and autumn months between 2015 to 2019 in Badswat *** source region of debris flow falls within the lower boundary of permafrost occurrence zone and lies below the 0℃isotherm during late spring and summer *** Shishkat catchment the 0℃isotherm reaches above the debris flow source area during August and the glacier do not show any significant variations in velocity and surface elevation *** debris flow source area is adjacent to the slow-moving rock glacier in Shishkat catchment while in Badswat catchment the debris flow initiated from the former glacier *** catchments are largely glacierized and thus sensitive to changes in climatic conditions and changes in the cryosphere response possess significant threats to the population *** monitoring of cryosphere-climate change in the region can contribute toward the improvement of disaster risk reduction and mitigation policies.

关键词： Cryosphere change Climate change Debris flow Remote sensing Permafrost Cryosphere hazard

Evaluation of cotton germplasm for morphological and biochemical host plant UPdates resistance traits against sucking insect pests complex

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Journal of Cotton Research 2021年第3期4卷 211-218页

作者： RIZWAN Muhammad ABRO Saifullah ASIF Muhammad Usman HAMEED Amjad MAH BOOB wajid DEHO Zaheer Ahmed SIAL Mahboob ali Nuclear Institute of Agriculture(NIA) TandojamSindh 70060Pakistan Nuclear Institute for Agriculture and Biology(NIAB) Faisalabad 38000Pakistan College of Plant Science and Technology Huazhong Agricultural UniversityWuhan 430070China

Background:Sucking insect pests cause severe damage to cotton crop *** development of insect resistant cotton cultivars is one of the most effective measures in curtailing the yield *** the role of morphological and biochemical host plant resista nee(HPR)traits in plant defense,12 cotton genotypes/varieties were evaluated for leaf area,leaf glanding,total soluble sugars,total soluble proteins,total phenolics,tannin and total flavonoids against fluctuating populations of whitefly,thrips and jassid under field ***:The population of these insects fluctuated during the growing seas on and remained above threshold level(whitefly>5,thrips>(8-10)f or jassid>1 per leaf)during late June and early *** and negative association of whitefly(r=-0.825)and jassid(r=-0.929)with seed cotton yield was *** population of insects were the highest in Glandless-1 followed by NIA-82 and ***-Kiran followed by NI AB-878 and Sadori were the most resistant,with the mean population of 1.41,1.60,1.66(whitefly);2.24,232,2.53(thrips)and 037,0.31,036(jassid),*** resistant variety NIAB-Kiran showed less soluble sugars(8.54 mg.g^(-1)),soluble proteins(27.11 mg.g^(-1))and more phenolic(36.56 mg.g^(-1))and flavonoids(13.10mg.g^(-1))as compared with the susceptible check ***,all insect populations were positively correlated with total soluble sugars and *** populations exhibited negative response to leaf gossypol glands,total phenolics,tannins and *** thrips and jassid populations had a significant and negative correlation with these four biochemical HPR ***:The ide ntified resistant resources and HPR traits can be deployed against sucking in sect pests'complex in future breeding programs of developing insect resistant cotton varieties.

关键词： Gossypium Insect resistance Plant defense Plant breeding Resistant traits Sucking in sects

Development of bis-thiobarbiturates as successful urease inhibitors and their molecular modeling studies

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Chinese Chemical Letters 2016年第5期27卷 693-697页

作者： Fazal Rahim Muhammad ali Shifa Ullah Umer Rashid Hayat Ullah Muhammad Taha Muhammad Tariq Javed wajid Rehman Aftab Ahmad Khan Obaid Ur Rahman Abid Muhammad Bilal Department of Chemistry Hazara University Department of Chemistry COMSATS Institute of Information Technology Department of Biochemistry and Biotechnology The Islamia University of Bahawalpur Atta-ur-Rahman Institute for Natural Product Discovery Universiti Teknologi MARA (UiTM)Puncak Alam Campus Faculty of Applied Science UiTM Department of Environmental Science COMSATS Institute of Information Technology

Bis-thiobarbiturate derivatives 1-15 have been synthesized, characterized by 1HNMR and El-MS and screened for urease inhibition. All compounds showed various degree of urease inhibitory activity with iC50 values ranging 7.45 ± 0.12 - 74.24 ± 0.81 μmol/L while the standard thiourea behaved normally （ICso = 21.10 ±0.12）. Compounds I （IC50= 7.45 ± 0.12 ]μmol/L）, 9 （IC50 =18,17 ± 1.03 bmol/L） and 13 （IC50= 8.61 ± 0.45 bmol/L） showed excellent urease inhibitory activity in the series. Molecular modeling studies were performed to understand the binding site with the bimetallic nickel center of the enzyme. Structure-activity relationship has also been established for these compounds. This study identified bis- thiobarbiturate as a novel class of urease inhibitors.

关键词： Thiobarbituric acid Synthesis Urease inhibition Molecular docking studies

Greywater Reuse Assessments on Different Soil Types in Baghdad City

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Journal of Environmental Science and Engineering(B) 2013年第3期2卷 183-188页

作者： Dheyaa wajid Abbood Seroor Atallah Khaleefa ali Suha Anwer Ibrahim Department of Civil & Environmental Mustansiriyah University Baghdad 14150 Iraq

he effects of greywater irrigation on four commonly used agricultural soils and models were studied. Sand, sandy loam, sandy clay and light clay soils were selected as common Iraq soils. Soil＇s chemical and physical properties under different irrigation regimes were daily measured during period extended from February 2011 to April 2012 in Baghdad city and plant growth was monitored. A lab scale models of four acrylic columns of 100 mm diameter and 750 mm height were designed and constructed in environmental hydraulic lab at Mustansiriya University and tests were run concurrently with the characterization study to assess the effect of soil depth and loading rate on treatment efficiency. Soil samples were carried out in a site that had been drained with greywater for over 14 months. Measurements of greywater and treated greywater had been achieved which contains BODs, COD, pH, EC, TDS, turbidity, CI＋1, 504＋2, NO3＋1, Na＋l, Ca＋2, Mg＋2, E coli and coliform.

关键词： Greywater reuse soil contaminated sand light clay sandy loam sandy clay.