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Journal of Materials Science & Technology 2018年第7期34卷 1103-1109页

作者： Jun Ma Shaochun Tang junaid ali syed Dongyun Su Xiangkang Meng Institute of Materials Engineering National Laboratory of Solid State Microstructures and College of Engineering and Applied Sciences Nanjing University School of Mechatronics & Traffic Engineering Nantong College of Science and Technology College of Mechanical Engineering Nantong Vocational University

The sandwich-like structure of reduced graphene oxide/polyaniline （RGO/PANI） hybrid electrode was prepared by electrochemical deposition. Both the voltage windows and electrolytes for electrochemical deposition of PANI and RGO were optimized. In the composites, PANI nanofibers were anchored on the surface of the RGO sheets, which avoids the re-stacking of neighboring sheets. The R（;O/PANI composite electrode shows a high specific capacitance of 466 F/g at 2 mA/cm2 than that of previously reported RGO/PANI composites. Asymmetric flexible supercapacitors applying RGO/PANI as positive electrode and carbon fiber cloth as negative electrode can be cycled reversibly in the high-voltage region of 0-1.6 V and displays intriguing performance with a maximum specific capacitance of 35.5 mF cm^-2. Also, it delivers a high energy density of 45.5 mW h cm^-2 at power density of 1250 mW cm^-2. Furthermore, the asymmetric device exhibits an excellent long cycle life with 97.6Z initial capacitance retention after 5000 cycles. Such composite electrode has a great potential for applications in flexible electronics, roll-up display, and wearable devices.2017 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science ＆ Technology.

关键词： Hybrid electrode Asymmetric supercapacitor Sandwich-like Electrochemical reduced graphene oxide

Facile NiCo_(2)S_(4)/C nanocomposite: an efficient material for water oxidation

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Tungsten 2020年第4期2卷 403-410页

作者： Umair Aftab Aneela Tahira Raffaello Mazzaro Vittorio Morandi Muhammad Ishaq Abro Muhammad Moazam Baloch junaid ali syed Ayman Nafady Zafar Hussain Ibupoto Mehran University of Engineering and Technology Jamshoro 76080Pakistan Department of Science and Technology Linköping University60174 NorrköpingSweden Institute for Microelectronics and Microsystems Italian National Research CouncilSection of Bologna40129 BolognaItaly College of Science King Saud UniversityRiyadh 11451Saudi Arabia Dr.M.A Kazi Institute of Chemistry University of SindhJamshoro 76080Pakistan

The water oxidation in alkaline media is a kinetically sluggish process and it requires an active electrocatalyst for overall water splitting which is a challenging task to ***,we formulate a platform for the design of efficient NiCo_(2)S_(4)/C nanocomposite using earth abundant and nonprecious *** nanocomposites are prepared by scale up hydrothermal method using different carbon contents from acid dehydrated *** are structurally and morphologically character-ized by various analytic *** scanning electron microscopy has shown few microns flower-like morphology of nanocomposite and hexagonal crystalline phase is identified by X-ray diffraction(XRD).Further,high-resolution transmission electron microscopy supported the XRD results,and C,Ni,Co and O elements were found in the composition nanocomposite as investigated by energy-dispersive *** most active nanocomposite reaches a current density of 20 mA·cm^(−2) at potential of 285 mV vs reversible hydrogen *** nanocomposite is kinetically supported by 61 mV·dec^(−1) as small Tafel *** nanocomposite is stable and durable for 40 *** electrochemical impedance spectroscopy described a small charge transfer resistance of 188.4Ω.These findings suggest that the NiCo_(2)S_(4)/C nanocomposite could be used as a promising material for an extended range of applications particularly in energy technology.

关键词： NiCo_(2)S_(4)/C Water oxidation Alkaline media Stable and durable

Energy and Life Cycle Assessment of Zinc/Water Nanofluid Based Photovoltaic Thermal System

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Energy Engineering 2022年第2期119卷 827-846页

作者： junaid Khan Rashid ali Muzammil Zubair syed Mohd Yahya SEARL Laboratory Department of Mechancial EngineeringAligarh Muslim UniversityAligarh202002India

Cooling the PV surface in a Photovoltaic Thermal system is a pivotal operational aspect to be taken into account to achieve optimized values of performance parameters in a Photovoltaic Thermal *** experimental design used in this study facilitates the flow of varying concentrations of Zn-water nanofluid in serpentine copper tubing installed at the rear of the PV panel thereby preventing the PV surface temperature from increasing beyond the threshold value at which a decrease in electrical efficiency starts to *** fusion of solar thermal with PV devices leads to better electrical and thermal efficiency values resulting in decreased cell degradation over time and maximization of the lifespan of the PV module and the energy output from the PV *** to the superior thermal heat properties of nanofluids,their usage in such systems has become increasingly *** cycle metrics which include Energy Payback period,Energy Production Factor and life cycle conversion efficiency were evaluated for the PVT system by exhaustively chalking fundamental parameters such as embodied energy of the PVT setup and the total energy output from the PVT *** research aims to be a major milestone in the evolutionary journey of Photovoltaic Thermal modules by guiding the engineers working on the theory,design and implementation of PVT systems towards its economic feasibility,environmental impact and energy sustainability.

关键词： Photovoltaic thermal system nanofluids performance parameters life cycle assessment

Analysis and Characterization of Normally-Off Gallium Nitride High Electron Mobility Transistors

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Computers, Materials & Continua 2021年第10期69卷 1021-1037页

作者： Shahzaib Anwar Sardar Muhammad Gulfam Bilal Muhammad syed junaid Nawaz Khursheed Aurangzeb Mohammad Kaleem Department of Electrical and Computer Engineering COMSATS University Islamabad(CUI)Islamabad45550Pakistan CTIF Global Capsule Department of Business Development and TechnologyAarhus University7400HerningDenmark Computer Engineering Department College of Computer and Information SciencesKing Saud UniversityRiyadh11543Saudi Arabia

High electron mobility transistor(HEMT)based on gallium nitride(GaN)is one of the most promising candidates for the future generation of high frequencies and high-power electronic *** research work aims at designing and characterization of enhancement-mode or normally-off GaN *** impact of variations in gate length,mole concentration,barrier variations and other important design parameters on the performance of normally-off GaN HEMT is thoroughly *** increase in the gate length causes a decrease in the drain current and transconductance,while an increase in drain current and transconductance can be achieved by increasing the concentration of aluminium(Al).For Al mole fractions of 23%,25%,and 27%,within Al gallium nitride(AlGaN)barrier,the GaN HEMT devices provide a maximum drain current of 347,408 and 474 mA/μm and a transconductance of 19,20.2,21.5 mS/μm,***,for Al mole fraction of 10%and 15%,within AlGaN buffer,these devices are observed to provide a drain current of 329 and 283 mA/μm,***,for a gate length of 2.4,3.4,and 4.4μm,the device is observed to exhibit a maximum drain current of 272,235,and 221 mA/μm and the transconductance of 16.2,14,and 12.3 mS/μm,*** is established that a maximum drain current of 997 mA/μm can be achieved with an Al concentration of 23%,and the device exhibits a steady drain current with enhanced *** observations demonstrate tremendous potential for two-dimensional electron gas(2DEG)for securing of the normally-off mode operation.A suitable setting of gate length and other design parameters is critical in preserving the normally-off mode operation while also enhancing the critical performance parameters at the same *** to the normallyon depletion-mode nature of GaN HEMT,it is usually not considered as suitable for high power levels,frequencies,and *** such settings,a negative bias is required to enter the blocking conditi

关键词： High electron mobility GaN HEMT bipolar transistors gallium nitride heterojunctions MOS devices

Supply Response Analysis of Rice Growers in District Gujranwala, Pakistan

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Agricultural Sciences 2014年第11期5卷 1069-1076页

作者： Sunair junaid Arif Ullah Shaofeng Zheng syed Noor Muhammad Shah Shahid ali Munir Khan Department of Agricultural and Applied Economics The University of Agriculture Peshawar Pakistan College of Economics and Management Northwest A & F University Yangling China Department of Horticulture Faculty of Agriculture Gomal University D. I. Khan Pakistan College of Horticulture Northwest A & F University Yangling China

The study was designed to estimate the restricted profit function in district Gujranwala, Punjab, Pakistan. Data were collected from 100 respondents using proportional allocation sampling tech-nique. The analysis was done using SHAZAM software. The results indicate that the farmers are price-responsive. Rice own price elasticity was 1.873. The output supply elasticity of rice with re-spect to education, land, fertilizer price and irrigation cost were 0.0.169, 1.274, -0.873 and -0.953 respectively. Irrigation demand elasticity with respect to education, land, fertilizer price, irrigation cost and output price were 0.14, 1.14, -0.783, -1.84 and 1.78 respectively. Fertilizer demand elasticity with respect to education, land, fertilizer price, irrigation cost and output price was 0.023, 0.792, -1.65, -0.85 and 1.851 respectively. Lastly, the elasticity of profit with respect to education, land, fertilizer price, irrigation cost and output price was 0.20, 1.10, -0.83, -1.136 and 1.92 respectively. The study recommends that Government should provide consistent electricity with stable rates, so that, they irrigate their fields through electric tube wells and ultimately their cost of irrigation decreases. The study also suggests that government should stabilized fertilizer prices to encourage its application. Furthermore, government should raise procurement price of rice to encourage its supply this;it in turn will also increase the profit of the farmer.

关键词： Rice Supply Response Translog Restricted Profit

Hypothyroidism—A Question towards Quality and Patient Centricity

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Open Journal of Endocrine and Metabolic Diseases 2015年第2期5卷 19-27页

作者： Hina Rehman syed junaid Rehan Humera Ishaq Sadia Shakeel Faraz Hashmi Safila Naveed Faculty of Pharmacy Jinnah University for Women Karachi Pakistan Faculty of Pharmacy Hamdard University Karachi Pakistan Jinnah Sindh Medical University Karachi Pakistan

The metabolic and endocrine disorders are either increasing across the globe or may have been observed with more focus in recent years. It is not uncommon now to find out neither patients of endocrine and metabolic disorders nor a physician of the associated diseases. There were 42 million people who had thyroid disorders including hypothyroidism according to the survey of endocrine society of India. Hypothyroidism is said when less activity of thyroid glands is observed then the normal. So, to evaluate the quality standard, empowerment and patient centricity in Pakistan with present prevalence of hypothyroidism in different age groups, gender along with the prescribed medication against pre diagnosed disease and associated co-morbidities, the study is designed with a questionnaire development including both qualitative and quantitative variables. Study was conducted on various OPD’s, profit and not for profit secondary and tertiary care hospitals and consultant clinics during July 2013 to Jan 2014 and it was given consideration to include people from all areas of life with minimization of any unforeseen biasness and comprehensive data. After full filling the inclusion criteria, 102 patients were selected as study participants. After completion and reviewing the questionnaire, data were analyzed by 21.00 SPSS version. Chi square/ fisher test, spearmen’s rank correlation were applied for categorical quantitative variable. Paired t test before and after were applied for qualitative variable. Highly significant reliability of items in the questionnaire was found along with inter item correlation (P < 0.05). Out of 102 patients of the study, 80 patients fell into the inclusion criteria, while 22 were excluded. A total of 80 patients were registered in the incorporate duration. Among the total samples 36 (42.9%) were males and 44 (52.4%) were females. Mean age males and females included in the study were 34.89 ± 17.73 and 33.36 ± 13.73 years respectively. The systolic an

关键词： Hypothyroidism Quality Patient Centricity Empowerment

热注入法制备Ni_(3)S_(4)纳米棒及其电化学性能

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江苏大学学报（自然科学版） 2022年第3期43卷 341-345页

作者：马骏吉内德苏冬云褚岩孟祥康江苏工程职业技术学院航空与交通工程学院江苏南通226006 南京大学南通材料工程技术研究院江苏南通226000 达伍德工程技术大学基础科学、数学和人文系巴基斯坦真纳路卡拉奇74800 南通职业大学机械工程学院江苏南通226007 南京大学现代工程与应用科学学院江苏南京210093

针对采用涂敷法制备电极材料时,运行一段时间后会出现电极的比容量性能下降较快的问题,利用热注入的方法,合成电化学性能优异、尺寸约为100 nm的Ni_(3)S_(4)纳米棒.研究表明:制备小尺寸的纳米材料作为超级电容器的电极材料,有利于反应... 详细信息

针对采用涂敷法制备电极材料时,运行一段时间后会出现电极的比容量性能下降较快的问题,利用热注入的方法,合成电化学性能优异、尺寸约为100 nm的Ni_(3)S_(4)纳米棒.研究表明:制备小尺寸的纳米材料作为超级电容器的电极材料,有利于反应过程中电解液的快速渗透,能够进一步提高其电化学性能;制备的Ni_(3)S_(4)纳米棒正极材料可以在0~0.55 V的电压区间内稳定工作;在电流密度为1 A·g^(-1)时,其比容量可达1097 F·g^(-1),在电流密度为20 A·g^(-1)时比容量仍可保持在740 F·g^(-1)左右;在电流密度为10 A·g^(-1)时,对Ni_(3)S_(4)纳米棒正极材料进行10000次循环测试,正极材料的保持率可达到91%.

关键词：正极材料硫化镍热注入法纳米棒循环性能超级电容器

Spindle Cell Carcinoma of the Maxilla: A Case Report of Rare Entity

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Surgical Science 2017年第5期8卷 220-227页

作者： Montasir junaid Maliha Kazi Sadaf Qadeer Department of Otorhinolaryngology-Head and Neck Surgery Jinnah Medical and Dental College Karachi Pakistan Department of Otorhinolaryngology-Head and Neck Surgery Royal Manchestor Infirmary Manchester UK Department of Otorhinolaryngology-Head and Neck Surgery Sir Syed College of Medical Sciences Karachi Pakistan

Spindle cell carcinoma also known as sarcomatoid carcinoma is a rare highly aggressive tumor which is histologically different from squamous cell ca and mesenchymal cancers. Only hands full of cases have been reported in literature since 1957 and hence no proper treatment protocol has been devised yet. We present such a case of thirty-four-year-old female who presented with spindle cell carcinoma of the maxilla at our department and was treated with extensive surgery followed by chemotherapy and radiation therapy. Spindle cell carcinoma is generally associated with poor prognosis and hence literature supports use of post operative Chemo and Radiotherapy for better result and decrease chance of local recurrence.

关键词： Spindle Cell Carcinoma Maxilla Maxillary Carcinoma

Thyroglossal Duct Anomalies in Pediatric and Adult Population: A 10-Year Experience in a Tertiary Care Hospital

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Surgical Science 2021年第7期12卷 226-235页

作者： Montasir junaid Ghaleb Al-Sayed Sayed Agha ali Shah Hareem U. Khan ali Mahdi Al Qannass Nadeem W. Malik Yahya Al Kahtani Ahmed Arghabi Abdul Aziz ali Binhossan Sadaf Qadeer Ahmed Department of Otolaryngology-Head and Neck Surgery Armed Forces Hospital Khamis Mushait KSA Department of Pathology Armed Forces Hospital Khamis Mushait KSA Department of Otolaryngology-Head and Neck Surgery Stanford University Palo Alto USA Department of Otolaryngology-Head and Neck Surgery Sir Syed University of Medical Sciences for Girls Karachi Pakistan

Introduction: Thyroglossal duct cyst is a well-recognized congenital midline neck swelling observed in early childhood and rarely in adults. It may reveal itself as a painless cyst, abscess, or as fistula. Several studies have been conducted across the world, but the literature is scarce on its presentation and complications in the Middle East. This indexing study aims to report a 10-year experience with thyroglossal duct cyst (TGDC) presentation, excision, and recurrence at a teaching hospital in Saudi Arabia (KSA). Methods: A retrospective chart review was conducted at the Armed Forces Hospital Southern Region, KSA from December 2008 to December 2018. Data were retrieved from the electronic medical record system of the hospital and validated with the histopathology records. A total of 48 patients diagnosed as TGDC, sinus or fistula were identified. Stata ver. 16.1 was used to analyze the data and results formulated using regression model and Pearson’s chi-square test. Results: The majority of our patients were female (60.4%), and the most common presentation was a midline neck swelling which moved with tongue protrusion. Surgical excision via Complete Sistrunk procedure was the operation of choice in 60.5% followed by excision of the cyst with tract and sinus tract. Previous infection and surgical history contributed to complications in our patients, but no association of age or gender was observed. Patients presenting with infected and discharging cysts were found to be much more likely to develop a recurrence (9 patients). Cysts deep to the hyoid showed more recurrence [n = 7 (78%)] compared to superficial cysts [n = 2 (22%)] and posterior and multi-tract lesions also showed significant recurrence. Conclusion: Despite being a common cause of neck swelling, thyroglossal duct cyst is often missed on physical exams. To reduce complications, timely diagnosis and treatment are necessary.

关键词： Midline Neck Swelling Thyroglossal Duct Cyst Sinus Tract Sistrunk Procedure

高循环性能的FeCo_(2)S_(4)/碳纤维复合电极材料

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电源技术 2022年第12期46卷 1457-1460页

作者：马骏彭景富苏冬云吉内德·阿里·赛义德江苏工程职业技术学院航空与交通工程学院江苏南通226006 南通南京大学材料工程技术研究院江苏南通226019 南通职业大学机械工程学院江苏南通226007 卡拉奇大学化学研究所国际化学与生物科学中心卡拉奇75270

对电极材料的结构进行优化设计,提高电活性材料的有效利用率。提出一种简单的一步电沉积双金属硫化物的策略,成功设计并制备了FeCo_(2)S_(4)双金属硫化物,沉积在高导电性、高比表面积碳纤维布上的复合材料,并应用于超级电容器作为电极... 详细信息

对电极材料的结构进行优化设计,提高电活性材料的有效利用率。提出一种简单的一步电沉积双金属硫化物的策略,成功设计并制备了FeCo_(2)S_(4)双金属硫化物,沉积在高导电性、高比表面积碳纤维布上的复合材料,并应用于超级电容器作为电极材料。通过电沉积法获得的FeCo_(2)S_(4)/CFC(FeCo_(2)S_(4)/碳纤维布)复合材料不仅改善了机械稳定性,并且进一步提升了复合材料的倍率性能和储能能力。研究结果表明:FeCo_(2)S_(4)/CFC具有出色的电化学性能,在1 A/g时具有505.33 F/g的高比电容,并且具有良好的倍率性能(10 A/g时比电容仍达到324 F/g)。出色的倍率性能归因于碳纤维布的加入,提高了复合材料的导电性。同时,对FeCo_(2)S_(4)/CFC材料进行10000次循环后,仍然可保持95.25%的循环稳定性。

关键词：铁钴硫化物/碳纤维布超级电容器比电容电极材料