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Comparison of Mechanical Properties of Acid and UV Ozone Treated Nanodiamond Epoxy Nanocomposites

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journal of Materials Science & Technology 2014年第8期30卷 753-758页

作者： Sobia A.Rakha Naveed Ali yasir A.Haleem Fakhre Alam Aqeel A.Khurram Arshad Munir Experimental Physics Labs National Centre for Physics ComplexIslamabad 45320Pakistan Centre of Excellence in Science and Advance Technologies Islamabad 45320Pakistan Centre of Excellence in Solid State Physics University of the PunjabLahore 54590Pakistan Department of Physics Kohat UniversityKohat 26000Pakistan

Nanodiamond（ND） powder was successfully activated by wet chemical method and by exposure of UV/O3 in a chamber followed by mixing in triethylenetetramine（TETA） *** reinforcement role of activated ND in the mechanical properties of epoxy matrix was *** treatments,*** and UV/O3 provide ND surface with chemical functionalities for adhesion with epoxy *** transform infrared spectroscopy was utilized to confirm the attachment of surface groups to the ND *** low content of acid and UV/O3 activated ND was dispersed ultrasonically in the epoxy matrix separately to make *** mechanical properties of the nanocomposites were investigated under three point *** strong interactions among activated ND particles and the epoxy resin provide efficient load transfer interfaces,which enhances the mechanical properties of the *** was found that the flexural strength,modulus,and toughness of 0.1 wt%ND loaded nanocomposites have been enhanced up to 85%,57%,and 39%,respectively for UV/O3 treated ND *** is also found that the optimum ND concentration to achieve maximum reinforcement is 0.1 wt%while higher concentrations lead to decrease in mechanical *** significant improvement of the mechanical properties of the ND/epoxy nanocomposites is attributed to the good dispersion of the functionalized ND in epoxy matrix.

关键词： Nanodiamond Dispersion Mechanical properties Nanocomposites

Ultra-Low Power 1 Volt Small Size 2.4 GHz CMOS RF Transceiver Design for Wireless Sensor Node

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journal of Beijing Institute of Technology 2018年第4期27卷 584-591页

作者： Muhammad yasir Faheem Shun'an Zhong Abid Ali Minhas Muhammad Basit Azeem School of Information and Electronics Beijing Institute of TechnologyBeijing College of Computer and Information Systems Al Yamamah University Department of Mechatronics Engineering University of Engineering and Technology

Ultra-low power transceiver design is proposed for wireless sensor node used in the wireless sensor network（WSN）.Typically,each sensor node contains a transceiver so it is required that both hardware and software designs of WSN node must take care of energy consumption during all modes of operation including active/sleep modes so that the operational life of each node can be increased in order to increase the lifetime of *** current declared size of the wireless sensor node is of millimeter order,excluding the power source and crystal *** have proposed a new 2.4 GHz transceiver that has five blocks namely XO,PLL,PA,LNA and *** proposed transceiver incorporates less number of low-drop outs（LDOs）*** size of the transceiver is reduced by decreasing the area of beneficiary components up to 0.41 mm;of core area in such a way that some functions are optimally distributed among other *** proposed design is smaller in size and consumes less power,<1 mW,compared to other *** operating voltage has also been reduced to 1 *** transceiver is most efficient and will be fruitful for the wireless networks as it has been designed by considering modern requirements.

关键词： low-drop outs(LDOs) transceiver metal oxide semiconductor field effect transistor(MOSFET) wireless sensor networks(WSN)

Robotic surgery and liver transplantation:A single-center experience of 501 robotic donor hepatectomies

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Hepatobiliary & Pancreatic Diseases International 2022年第4期21卷 334-339页

作者： Maren Schulze Yasser Elsheikh Markus Ulrich Boehnert yasir Alnemary Saleh Alabbad Dieter Clemens Broering Organ Transplant Center of Excellence King Faisal Specialist Hospital&Research CentreP.O.Box 3354Riyadh 11211Saudi Arabia

Background:Over the past two decades robotic surgery has been introduced to many areas including liver *** liver surgery is an alternative minimally invasive ***,moving on to the complexity of living donor hepatectomies,the advantages of robotic versus laparoscopic approach have convinced us to establish the robotic platform as a standard for living donor ***:From November 2018 to january 2022,501 fully robotic donor hepatectomies,including 177 left lateral donor lobes,112 full left lobes and 212 full right lobes were *** were donated to 296 adult recipients and 205 pediatric *** age,sex,body weight,body mass index(BMI),graft weight,graft to body weight ratio(GBWR),operative time,blood loss,first warm ischemic time,pain score,length of intensive care unit(ICU)stay and hospital stay,and complications were retrospectively analyzed based on a prospectively kept *** were evaluated for graft and patient survival,age,sex,BMI,body weight,model of end-stage liver disease score,blood loss,transfusions,operative time,cold ischemic time,length of hospital stay and ***:There was no donor *** cases needed to be converted to open *** median blood loss was 60 mL(range 20-800),median donor operative time was 6.77 h(range 2.93-11.53),median length of hospital stay was 4 days(range 2-22).Complication rate in donors classified following ClavienDindo was 6.4%(n=32)with one grade Ⅲ ***-year actual recipient overall survival was 91.4%;87.5% for adult recipients and 97.1% for pediatric ***-year actual graft overall survival was 90.6%;87.5% for adult recipients and 95.1% for pediatric ***-hospital mortality was 6%,9.1%(27/296)for adult recipients and 1.4%(3/205)for pediatric *** recipients’morbidity was 19.8%(n=99).Twenty-eight recipients(5.6%)had biliary and 22(4.4%)vascular ***(12.0%)recipients needed to

关键词： Living liver donor Innovation Robotic donor surgery Donor safety Minimally invasive donor surgery

Microstructure and Mechanical Properties of Fe-based Amorphous Composite Coatings Reinforced by Stainless Steel Powders

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journal of Materials Science & Technology 2015年第1期31卷 43-47页

作者： H.Zhou C.Zhang W.Wang M.yasir L.Liu School of Materials Science and Engineering State Key Lab for Materials Processing and Die &Mould TechnologyHuazhong University of Science and Technology Huazhong University of Science and Technology Research Institute in Shenzhen

In this study,a few Fe-based amorphous matrix composite coatings reinforced with various portions(4,8 and16 vol.%) of 31 6L stainless steel powders have been successfully produced through high velocity oxy-fuel(HVOF) *** microstructure of the composite coatings was systematically characterized by X-ray diffraction(XRD),scanning electron microscopy(SEM) and transmission electron microscopy(TEM).The main structure of composite coatings remained amorphous while 31 6L stainless steel splats were distributed homogeneously in the amorphous matrix and well connected with surrounding amorphous *** strength of coatings to the substrate was determined by 'pull-off' tensile *** results revealed that the31 6L stainless steel phase effectively improved the bonding strength of amorphous coatings,which is mainly contributed by the strong metallurgical bonding between stainless steel and amorphous *** addition of31 6L stainless steel also enhanced the ductility and fracture resistance of the coatings due to the ductile stainless steel phases,which can arrest crack propagation and increase energy dissipation.

关键词： Thermal spraying Fe-based amorphous coating Stainl

Ultra-Low Power Small Size 5.8 GHz RF Transceiver Design for WiMAX/4G Applications

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journal of Beijing Institute of Technology 2019年第1期28卷 103-108页

作者： Muhammad yasir Faheem Shuna'n Zhong Abid Ali Minhas Muhammad Basit Azeem School of Information and Electronics Beijing Institute of Technology College of Computer and Information Systems Al Yamamah University Department of Electrical Engineering COMSATS University IslamabadLahore Campus

A state of the art ultra-low power small sized transceiver design has been *** device consists of four blocks,including a frequency synthesizer(FS),a crystal oscillator(XO),transmitter and receiver attached with an *** has been seen that wireless information technology and systems have played a vital role in the transformation of society in different aspects of *** wireless communications including WiMAX/4G have attracted researchers and ***/4G applications need a transceiver that can be used in the worst channel conditions,but with low power consumption and low input voltage at the 5.8 GHz *** proposed transceiver operates on 1.2 *** operating frequency,noise figure(NF)and receiver gain are 5.8 GHz,4.0 dB and 90 dB *** is a highly compatible transceiver with all the 4G *** details and results have revealed that the proposed transceiver is much more efficient than the previously proposed transceivers in literature.

关键词： worldwide interoperability for microwave access frequency synthesizer(FS) power amplifier low noise amplifier

Prediction of promiscuous T cell epitopes in RNA dependent RNA polymerase of Chikungunya virus

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Asian Pacific journal of Tropical Medicine 2017年第8期10卷 825-829页

作者： yasir Waheed Sher Zaman Safi Muzammil Hasan Najmi Hafsa Aziz Muhammad Imran Foundation University Medical College Foundation University IslamabadDHA-I Islamabad(44000)Pakistan Interdisciplinary Research Centre in Biomedical Materials(IRCBM) COMSATS Institute of Information TechnologyLahore CampusLahorePakistan Nuclear Medicine Oncology and Radiotherapy Institute Islamabad Islamabad(44000)Pakistan Department of Medical Laboratory Sciences(DMLS) Faculty of Health and Allied Sciences(FHAS)Imperial College of Business Studies(ICBS)LahorePakistan Department of Microbiology University of Health SciencesLahorePakistan

Objective: To explore RNA dependent RNA polymerase of Chikungunya virus(CHIKV) and develop T cell based epitopes with high antigenicity and good binding affinity for the human leukocyte antigen(HLA) classes as targets for epitopes based CHIKV vaccine. Methods: In this study we downloaded 371 non-structural protein 4 protein sequences of CHIKV belonging to different regions of the world from the US National Institute of Allergy and Infectious Diseases(NIAID) virus pathogen resource database. All the sequences were aligned by using CLUSTALW software and a consensus sequence was developed by using Uni Pro U Gene Software version 1.2.1. PropredⅠand Propred software were used to predict HLAⅠ and HLAⅡ binding promiscuous epitopes from the consensus sequence of non-structural protein 4 protein. The predicted epitopes were analyzed to determine their antigenicity through Vaxijen server version 2.0. All the HLAⅠ binding epitopes were scanned to determine their immunogenic potential through the Immune Epitope Database(IEDB). All the predicted epitopes of our study were fed to IEDB database to determine whether they had been tested earlier. Results: Twenty two HLA class Ⅱ epitopes and eight HLA classⅠepitopes were predicted. The promiscuous epitopes WMNMEVKII at position 486–494 and VRRLNAVLL at 331–339 were found to bind with 37 and 36 of the 51 HLA class Ⅱ alleles respectively. Epitope MANRSRYQS at position 58–66 and epitopes YQSRKVENM at positions 64–72 were predicted to bind with 12 and 9 HLAⅠI alleles with antigenicity scores of 0.754 9 and 1.013 0 respectively. Epitope YSPPINVRL was predicted to bind 18 HLAⅠ alleles and its antigenicity score was 1.425 9 and immunogenicity score was 0.173 83. This epitope is very useful in the preparation of a universal vaccine against CHIKV infection. Conclusions: Epitopes reported in this study showed promiscuity, antigenicity as well as good binding affinity for the HLA classes. These epitopes will provide the baseline for development

关键词： Chikungunya virus Epitope vaccine HLA binding T cell epitopes

Plant extract-loaded bacterial cellulose composite membrane for potential biomedical applications

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journal of Bioresources and Bioproducts 2021年第1期6卷 26-32页

作者： Atiya Fatima Sumayia yasir MohdShariq Khan Sehrish Manan Muhammad Wajid Ullah Mazhar Ul-Islam Department of Chemical Engineering College of EngineeringDhofar UniversitySalalahSultanate of Oman Department of Biomedical Engineering Huazhong University of Science and TechnologyWuhan 430074China

Bacterial cellulose(BC)has been extensively explored as biomaterial for various biomedical applications owing to its non-toxic nature and unique structural morphology and impressive physicochemical and mechanical ***,its high production cost and lack of antimicrobial activity have restricted its large-scale production and therapeutic ***,the current study is aimed to devise a strategy for low-cost BC production and develop its composite with bioactive materials to bless it with antimicrobial ***,5 mm thick reticulated fibrous and highly porous BC was produced by utilizing the wasted rotten tomatoes as the production *** produced bacterial cellulose waste(BCW)(i.e.,produced from wastes)was ex-situ modified with bioactive plant extract(PE)obtained from Euclea schimperi,and the bactericidal activity of the developed BCW/PE was evaluated against Gram-positive Staphylococcus aureus and Gram-negative Escherichia coli through disc diffusion and colony forming unit(CFU)count *** BCW/PE composite showed high bactericidal activities against *** and produced clear inhibition zone whereas negligible activity was observed against ***,indicating its bactericidal activity mainly against the Gram-positive ***,this study illustrates that there is a huge potential for developing valuable biomaterials from food wastes and utilizing their liquid holding capabilities for value-added applications in medical and pharmaceutical fields.

关键词： Bacterial cellulose Food waste Plant extract Bactericidal activity Biomedical application

Assessment of sunflower germplasm for phytoremediation of lead-polluted soil and production of seed oil and seed meal for human and animal consumption

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journal of Environmental Sciences 2020年第1期32卷 24-38页

作者： Afsheen Zehra Zulfiqar Ali Sahito Wenbin Tong Lin Tang yasir Hamid Muhammad Bilal Khan Zarina Ali Beena Naqui Xiaoe Yang Ministry of Education(MOE)Key Laboratory of Environmental Remediation and Ecosystem Health College of Environmental and Resources ScienceZhejiang UniversityHangzhou 310058China Department of Botany Federal Urdu University of ArtsScience and TechnologyKarachi 75300Pakistan Technical Extension Station of Soil Fertilizer and Rural Energy QujiangQuzhou 324000China PCSIR Laboratories Complex KarachiDr Salimuzzaman RoadKarachi 75280Pakistan

Phytoremediation is a valuable technology for mitigating soil contamination in agricultural lands,but phytoremediation without economic revenue is unfeasible for land owners and *** use of crops with high biomass and bioenergy for phytoremediation is a unique strategy to derive supplementary benefits along with remediation ***(Helianthus annuus L.)is a high-biomass crop that can be used for the phytoremediation of polluted lands with additional advantages(biomass and oil).In this study,40 germplasms of sunflower were screened in field conditions for phytoremediation with the possibility for oil and meal *** study was carried out to the physiological maturity *** studied germplasms mopped up substantial concentrations of Pb,with maximum amounts in shoot>root>seed *** phytoextraction efficiency of the germplasm was assessed in terms of the Transfer factor(TF),Metal removal efficiency(MRE)and Metal extraction ratio(MER).Among all assessed criteria,GP.8585 was found to be most appropriate for restoring moderately Pb-contaminated soil accompanied with providing high biomass and high yield *** Pb content in the oil of GP.8585 was below the Food safety standard of China,with 59.5% oleic acid and 32.1% linoleic ***,amino acid analysis in meal illustrated significant differences among essential and nonessential amino *** acid was found in the highest percentage(22.4%),whereas cysteine in the lowest percentage(1.3%).Therefore,its efficient phytoextraction ability and good quality edible oil and meal production makes GP.8585 the most convenient sunflower germplasm for phytoremediation of moderately Pb-contaminated soil,with fringe benefits to farmers and landowners.

关键词： Heavy metal Soil contamination Metal removal efficiency(MRE) Germplasm(GP) Phytoextraction Edible oil Fatty acids(FA) Amino acids(AAs)

带混合连接的装配式混凝土剪力墙抗震性能研究

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振动与冲击 2024年第19期43卷 306-318页

作者：韩启浩 yasir Naeem 汪大洋何建鑫江西理工大学土木与测绘工程学院江西赣州341000 广州大学土木工程学院广州510006

基于完成的带水平连接的装配式混凝土剪力墙(precast concrete shear walls with horizontal connection,PCSW-HC)试验研究,提出了一种带混合连接的装配式混凝土剪力墙(precast concrete shear walls with hybrid connection,PCSW-HVC),其中,水平连接采用高强螺栓的“强”连接方式,竖向连接采用钢剪切键(steel shear key,SSK)的“弱”连接方式。首先,结合已完成的试验,建立带水平连接的装配式混凝土剪力墙的数值模型,通过对比试验与数值分析结果,验证了材料本构关系的选取、各部件相互作用关系设置的正确性。进一步,采用同样的建模方法,建立带混合连接的装配式混凝土剪力墙的数值模型。分析了不同竖缝型式和增设钢剪切键对带混合连接的装配式混凝土剪力墙抗震性能的影响,揭示了其损伤失效模式。结果表明:单片剪力墙模块分割成较小尺寸模块拼装后,抗侧刚度有一定程度的减小,但刚度退化更缓慢,剪力墙墙板损伤更小,具有更好的变形能力;在剪力墙模块之间的竖缝中增设钢剪切键后,提高抗侧刚度的同时还可以改善其刚度退化行为,与不带钢剪切键模型相比,单片剪力墙(Single模型)和竖向滑动双片剪力墙(Sliding模型)峰值割线刚度分别提高了14.9%和11.4%;带混合连接的装配式混凝土剪力墙的损伤失效模式为“钢剪切键塑性屈服-墙板模块底部损伤-墙板模块破坏”,实现了钢剪切键塑性屈服耗能与墙板塑性损伤转移的“双功能”控制。

关键词：装配式混凝土剪力墙混合连接数值分析耗能失效模式