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Dengue outbreak in Swat and Mansehra,Pakistan 2013;an epidemiological and diagnostic perspective

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Asian Pacific Journal of Tropical Medicine 2016年第4期9卷 371-375页

作者： Muhammad Suleman Rani Faryal Uzma Bashir Aamir Muhammad Masroor Alam Nadia Nisar Salmaan Sharif Shahzad Shaukat Adnan Khurshid Mehar Angez Massab Umair Ghulam Mujtaba Mian Muhammad Sufian yasir arshad Lubna Rehman Syed Sohail Zahoor Zaidi Department of Microbiology.Quaid-i-Azam University Department of Virology National Institute of Health

Objective:To High light some epidemiological,clinical and diagnostic features of dengue fever during an outbreak and the role of different diagnostic techniques to achieve the highest level of accuracy in ***:Blood samples(n=323) were collected along with epidemiological and clinical data from suspected dengue patients who visited different hospitals in Swat and Mansehra district of Pakistan between May-November 2013 during a dengue *** were tested for the detection of viral nucleic acid by real-lime *** structural protein-1(NS1antigen and IgM antibodies by ***:Out of 323 cases with clinical dengue infection,304 were positive by one or more diagnostic parameter:201 samples were positive by real-time PCR,209 were positive by NS1 ELISA and 190 were positive by IgM *** of real-time PCR and NS1 *** were comparable for early diagnosis of dengue virus *** antibody detection assay was found useful for the diagnosis in the samples collected later than day 5 of ***:The use of real-lime PCR or detection of non stnictural protein NS 1 by ELISA followed by IgM antibodies detection can be recommended for early diagnosis of dengue virus infection with a high level of accuracy.

关键词： Dengue virus NS1 Antigen Pakistan Diagnosis Epidemiology Khyber Pakhtunkhwa

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

Acorn shell-derived porous bio-based carbon for high-performance dye-sensitized solar cells and supercapacitors

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Acorn shell-derived porous bio-based carbon for high-perform...

第六届新型太阳能电池材料科学与技术学术研讨会

作者：王子齐 Chen Wang Yangliang Zhang Yiming Si Feng Han yasir Abbas Asim arshad 云斯宁西安建筑科技大学材料科学与工程学院功能材料研究所

Dye-sensitized solar cells(DSSCs) have attracted great attention in the field of renewable energy. The counter electrode(CE) plays a crucial role in high-performance DSSCs. It is significant to develop progressive CE materials with considerable electrocatalytic activity. To improve the charge storage capacity of supercapacitors(SCs),using porous carbon materials as working electrodes is an effective technical strategy. In the present work, an acorn shell-derived porous bio-based carbon(AS-BC) with a high specific surface area(1312 m g) is controllably prepared by combining simple hydrothermal carbonization with chemical activation. The AS-BC as a CE for DSSCs reveals superior electrocatalytic activity for the reduction of I and a high power conversion efficiency(PCE) of 6.00%, matching the PCE of the DSSC with Pt CE(6.7%).As a working electrode for SCs, the AS-BC electrode reveals a remarkable specific capacitance of 234 F g at 0.5 A g in a three-electrode system with excellent rate performance(79.91% capacitance retention after current density magnifies from 0.5 to 5 A g). This work provides an efficient strategy for fabricating morphology-controllable porous bio-based carbon with high specific surface area(1312 m g) that exhibits significant potential for new energy devices.

关键词： Porous bio-based carbon acorn shell electrodes dye-sensitized solar cells supercapacitors

Tantalum-based bimetallic oxide deposited on bio-carbon as counter electrode catalysts for dye-sensitized solar cells

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Tantalum-based bimetallic oxide deposited on bio-carbon as c...

第六届新型太阳能电池材料科学与技术学术研讨会

作者：乔昕莹 Jingwen Li Feng Han Yiming Si Yangliang Zhang yasir Abbas Asim arshad 云斯宁西安建筑科技大学材料科学与工程学院功能材料研究所

Dye-sensitized solar cells are one of the most efficient devices for developing and utilizing solar energy, research on DSSCs will help decrease current energy crisis and environmental pollution problems. Counter electrode is an important part of DSSCs, the development of potentially effective alternatives to Pt-free materials has attracted widespread attention. Transition metal oxide have the electronic structure similar to Pt,which also shows excellent catalytic performance in DSSCs as counter electrode catalysts materials. Carbon materials have low cost, high electrochemical catalytic activity, and corrosion resistance. Our previous work has shown that there is a synergistic effect between transition metal oxides and carbon materials. It is found that the MnTaO and MnTaO/BC show excellent electrocatalytic activity and high PCE of 3.66% and 7.25% respectively. surpassing that of DSSC with Pt counter electrode(6.70%). indicating the excellent catalytic activity for the reduction of triiodide to iodide.

关键词： Dye-sensitized solar cell Counter electrode Catalysts Tantalum-based bimetal oxide

Bio-based carbon supported molybdenum-based oxides as counter electrode for dye-sensitized solar cells

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Bio-based carbon supported molybdenum-based oxides as counte...

第六届新型太阳能电池材料科学与技术学术研讨会

作者：韩凤 Chen Wang Yiming Si Yangliang Zhang Jingwen Li Xinying Qiao Yongwei Zhang Asim arshad yasir Abbas 云斯宁西安建筑科技大学材料科学与工程学院功能材料研究所

Counter electrodes(CE), one of the vital components in dye-sensitized solar cells(DSSCs), play a role in catalyzing the reduction of I to I and collecting the electrons from external circuit. Platinum(Pt) is widely used as CE material in DSSC, but the high cost,scarcity, and easy erosion by I/I electrolyte limit its commercialization. In this regard,transition metal oxides(TMOs) can be used as alternative CE materials due to their similar electronic structure with Pt. In this work, bio-based carbon supported Mo-based oxide composite(ZnMoO/bio-based carbon(BC)) is prepared successfully via a facile co-precipitation route and is used as CE materials in DSSCs. The power conversion efficiency of DSSCs based on the ZnMoO and ZnMoO/BC CE is 2.63% and 6.83%,respectively, indicating that bio-based carbon effectively improves the catalytic activity of the Mo-based oxides. This work provides a facile and effective strategy for preparing alternative Pt CE materials with superior performance for energy conversion devices.

关键词： Dye-sensitized solar cell Counter electrode Co-precipitation Molybdenum-based oxides Bio-based carbon

Dual functional application of pomelo peel-derived bio-based carbon with controllable morphologies: An efficient catalyst for triiodide reduction and accelerant for anaerobic digestion

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Dual functional application of pomelo peel-derived bio-based...

第六届新型太阳能电池材料科学与技术学术研讨会

作者：王晨 Hongfei Xu Ziqi Wang Feng Han Yangliang Zhang Yiming Si Xinying Qiao Jingwen Li yasir Abbas Asim arshad 云斯宁西安建筑科技大学材料科学与工程学院功能材料研究所

Exploring the new generation clean-renewable and high-performance energy conversion materials for dye-sensitized solar cell(DSSC) and anaerobic digestion(AD) is an effective approach to ease the energy demands and environmental ***-derived carbon materials have attracted much attention in DSSC and AD due to their excellent electrical conductivity, high specific surface area, excellent catalytic activity,and wide avaliability. Pomelo peel-derived bio-based carbon with controllable morphologies are successfully prepared via three different methods(microwave pyrolysis,two-step activation, hydrothermal carbonization combing chemical activation). The difference in specific surface area and pore size distribution caused by various morphology features have remarkably affected the application potential of as-prepared bio-based *** bio-based carbon prepared via two-step activation method as counter electrode catalyst in DSSC obtains an excellent photovoltaic performance as compared with the Pt-based DSSC(6.94% vs. 6.71%). Furthermore, the as-prepared bio-based carbon is used as accelerant in AD system and obtains the enhanced cumulative biogas production(525 mL/g VS) and COD removal rate(70.95%) as compared to the control check group(296 mL/g VS, 29.55%). This work illustrates three promising methods to prepare bio-based carbon with controllable morphologies and superior surface area to realize their multi-function resource utilization in renewable energy fields.

关键词： Bio-based carbon Counter electrode Dye-sensitized solar cell Accelerant Anaerobic digestion

Impact of Climate Change on Epidemiology of Various Pests of Wheat Crop in Punjab Pakistan

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American Journal of Plant Sciences 2019年第1期10卷 236-247页

作者： Israr arshad Amer Rasul Syed Ismat Hussain Hafiz Muhammad Usman Aslam Khizar Hayat Malik Najam Ul Hassan Sidra Muqeet Amina yasir Umar Shabab Nasir Anum Tehseen Directorate of Pest Warning & Quality Control of Pesticides Punjab Pakistan Department of Plant Pathology University of Agriculture Faisalabad Pakistan Department of Plant Pathology and Microbiology Iowa State University USA Horticultural Research Institute Ayub Agricultural Research Institute (AARI) Faisalabad Pakistan Department of Zoology Government College University Faisalabad Faisalabad Pakistan Institute of Agriculture & Resource Economics University of Agriculture Faisalabad Pakistan

Wheat [Triticum aestivum L. (Poaceae)] is the staple diet of people in Pakistan. It is attacked by many types of pests. Therefore the purpose of this study was to assess the impact of climate change on the ecology and epidemiology of various wheat pests in Punjab, Pakistan. Results indicate that maximum weeds hot spots 242 (5.98%) Phalaris minor, 45 (1.18%) wild oat and 203 (5.01%) broad leaf weeds were noted in 2015. Aphid 31 (0.86%) hot spots were recorded in 2016 while maximum army worm 13 (0.26%) hot spots were noted in 2017. Maximum 70 (1.73%) spots of yellow rust and 85 (2.10%) hot spots of brown rust were observed during 2015 while 84 (4.16%) spots of loose smut were observed during 2017. ANOVA shows that years have no significant difference (P > 0.05) but weeks have significant effect on occurrence of these pest incidences except brown rust. But regression ANOVA was significant (P ≤ 0.05) and regression models equations have been developed on the bases of recorded data. Pest incidence was taken as dependent variable Y and weather factors i.e. minimum temperature as X1, maximum temperature as X2, relative humidity as X3 and rain fall as X4 were taken as independent variables. This study will help in recommendations for moving forward aiming at integration of biology of rust and smut diseases of wheat with changing climate for development of resistant varieties for resilient and durable management of these pathogens.

关键词： Climate Change Wheat Weeds Insect Pest Disease Ecology

Bio-based carbon supported flower-like CoWO4 as counter electrode catalysts in dye-sensitized solar cells

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Bio-based carbon supported flower-like CoWO4 as counter elec...

第六届新型太阳能电池材料科学与技术学术研讨会

作者：张阳亮 Chen Wang Ziqi Wang Hongfei Xu Yiming Si Feng Han Jingwen Li Xinying Qiao yasir Abbas Asim arshad 云斯宁西安建筑科技大学材料与矿资学院功能材料研究所西安建筑科技大学材料科学与工程学院功能材料研究所

Counter electrode(CE) is an important component of dye-sensitized solar cells(DSSCs), which collect electrons from the external circuit and reduce I ions in the electrolyte. Pt is preferred CE materials in DSSCs, but the cost and scarcity of Pt have limited its broad application. In this regard, we synthesized a series of tungsten(W)-based bimetal oxides, then bio-based carbon(BC) were introduced to fabricate composites and used as CE materials in DSSCs assembled with I/I redox shuttle. In the hydrothermal system, BC worked as a structure-directing agent to direct the self-assembly of CoWO nano-flowers. As CE for DSSC CoWO/BC exhibit enhanced electrocatalytic activity and reduced charge-transfer resistance because of the synergistic effects of catalytic tungsten-based bimetal oxides and conductive bio-based carbon. The power conversion efficiency of DSSC with CoWO/BC CE is 6.07%, comparable to that of the Pt-based DSSC(6.46%). This indicates that the introduction of bio-based carbon is an excellent strategy to improve electrical conductivity of W-based bimetal oxides.

关键词： Dye-sensitized solar cell Counter electrode Catalysts Tungsten-based bimetal oxide Bio-based carbon

Integrated Approach to Improve Electrocatalytic Activity of Tantalum Derivatives as Counter Electrode in Dye-sensitized Solar Cells

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Integrated Approach to Improve Electrocatalytic Activity of ...

第六届新型太阳能电池材料科学与技术学术研讨会

作者：党姣娥 Feng Han Yongwei Zhang Yiming Si yasir Abbas Asim arshad Chen Wang Yangliang Zhang Ziqi Wang Jingwen Li Xinying Qiao 云斯宁西安建筑科技大学材料与矿资学院功能材料研究所西安建筑科技大学材料科学与工程学院功能材料研究所

The counter electrode(CE) is a crucial part in dye-sensitized solar cells(DSCs) to catalyze redox couple. Tantalum used as CE has been investigated to strengthen the catalytic activity in DSCs due to the similar electronic structure with Pt. This work designs and fabricates tantalum-based compounds(TaO, TaON, TaN, TaC,TaC/MC) as highly efficient, cost-effective and earth abundant CE for DSCs toward the I/I redox couples. TaON and TaN are fabricated by nitridation of TaO in NH atmosphere then compared with commercial TaC. Furthermore, TaC/MC are synthesized via the soft-template method to further improve the catalytic performance of TaC. The DSCs with TaON CE get the power conversion efficiency(PCE) of 5.46%, surpass the DSCs with TaO(5.20%) and TaN(5.03%) CE. TaC/MC utilized as CE in DSC obtains higher PCE(6.77%) compared with TaC(6.24%), MC(6.52%) and Pt(6.34%) as CEs in DSCs. This work provides effective and generally applicable methods to synthesis early-transition-metals-based compounds as potential CE catalysts, which can help to reduce the cost and enhance the catalytic performance.

关键词： tantalum counter electrode dye-sensitized solar cells nitridation soft-template method