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Defect Engineering in Earth-Abundant Cu_(2)ZnSnSe_(4) Absorber Using Efficient Alkali Doping for Flexible and Tandem Solar Cell Applications

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Energy & Environmental Materials 2024年第2期7卷 249-256页

作者： Muhammad Rehan Ara Cho Inyoung Jeong Kihwan Kim asmat ullah Jun-Sik Cho Joo Hyung Park Yunae Jo Sung Jun Hong Seung Kyu Ahn SeJin Ahn Jae Ho Yun Jihye Gwak Donghyeop Shin Photovoltaics Research Department Korea Institute of Energy Research(KIER)152-Gajeong-roYuseong-guDaejeon 34129Korea Department of Renewable Energy Engineering University of Science and Technology(UST)217-Gajeong-roYuseong-guDaejeon 34113Korea Korea Institute of Energy Technology(KENTECH) 50772 Ujeong-roNaju Jeonnam 58217Korea

To demonstrate flexible and tandem device applications,a low-temperature Cu_(2)ZnSnSe_(4)(CZTSe)deposition process,combined with efficient alkali doping,was ***,high-quality CZTSe films were grown at 480℃by a single co-evaporation,which is applicable to polyimide(PI)*** of the alkali-free substrate,Na and K alkali doping were systematically studied and optimized to precisely control the alkali distribution in *** bulk defect density was significantly reduced by suppression of deep acceptor states after the(NaF+KF)*** the low-temperature deposition with(NaF+KF)PDTs,the CZTSe device on glass yields the best efficiency of 8.1%with an improved Voc deficit of 646 *** developed deposition technologies have been applied to *** the first time,we report the highest efficiency of 6.92%for flexible CZTSe solar cells on ***,CZTSe devices were utilized as bottom cells to fabricate four-terminal CZTSe/perovskite tandem cells because of a low bandgap of CZTSe(~1.0 eV)so that the tandem cell yielded an efficiency of 20%.The obtained results show that CZTSe solar cells prepared by a low-temperature process with in-situ alkali doping can be utilized for flexible thin-film solar cells as well as tandem device applications.

关键词： alkali doping Earth-abundant Cu_(2)ZnSnSe_(4) flexible solar cells four-terminal tandem cells low-temperature process

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Mechanical sensor PDLIM5 promotes the osteogenesis of human adipose-derived stem cells through microfilament alterations

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Genes & Diseases 2024年第3期11卷 136-139页

作者： Yuchao Yang Shutong Wu Rongmei Qu Congrong Wang Jinyang Wang asmat ullah Khan You Pan Wenqing Liu Jinhui Zhu Muhammad Akram Khan Chujiang Xu Jingxing Dai Jun Ouyang Guangdong Provincial Key Laboratory of Medical Biomechanics&National Key Discipline of Human Anatomy Schoolof BasicMedical SciencesSouthern Medical UniversityGuangzhouGuangdong 510515China Department of Laboratory Medicine Nanfang Hospital of Southern Medical UniversityGuangzhouGuangdong 510515China Department of Pathology Guangdong Provincial People's HospitalGuangdong Academy of Medical SciencesGuangzhouGuangdong 510080China Department of Breast Surgery Guangxi Medical University Cancer HospitalNanningGuangxi 530000China Department of Veterinary Pathology Faculty of Veterinary and Animal SciencesPMAS Arid Agriculture UniversityRawalpindi 46300Pakistan Department of Orthopedics TCM-Integrated HospitalSouthern Medical UniversityGuangzhouGuangdong 510000China

Bone regeneration is a multifaceted,abstract,and wellcoordinated physiological progression of bone formation that participates in continuous regeneration and remodeling throughout ***,when it comes to complex clinical situations requiring extensive bone regeneration,such as massive bone defects caused by injuries,infection,or tumor removal,traditional methods do not often yield good treatment strategies or protocols due to their limitations.

关键词： alterations injuries massive

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Recognizing production options for pearl millet in Pakistan under changing climate scenarios

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Journal of Integrative Agriculture 2017年第4期16卷 762-773页

作者： asmat ullah Ashfaq Ahmad Tasneem Khaliq Javaid Akhtar Agro-climatology Laboratory Department of Agronomy University of Agriculture Faisalabad 38040 Pakistan Directorate of Agronomy Ayub Agricultural Research Institute (AARI) Faisalabad 38850 Pakistan Institute of Soil and Environmental Sciences University of Agriculture Faisalabad 38040 Pakistan

Climate change is making the lands a harsher environment all over the world including Pakistan. It is expected to oppose us with three main challenges： increase in temperature up to 2-5℃ （heat stress）, increasing water stress and severe malnourishment due to climate change. It has been foreseen that there will be a 10% increase of dryland areas with climate change in the world, with more variability and incidences of short periods of extreme events （drought and heat stress）. Pearl millet is a hardy, climate smart grain crop, idyllic for environments prone to drought and heat stresses. The crop continues to produce highly nutritious grain sustainably, thereby encouraging the fight against poverty and food insecurity due to its resilience. The crop is more responsive to good production options （planting time, planting density, inter/intra row spacing, nitrogen application and irrigation）. It has high crop growth rate, large leaf area index and high radiation use efficiency that confers its high potential yield. In most of the cases, pearl millet is remained our agricultural answer to the climate calamity that we are facing, because it is selected as water saving, drought tolerant and climate change complaint crop. In view of circumstances, pearl millet cultivation must be retrieved by recognizing production options in context to changing climate scenarios of Pakistan using crop modeling techniques.

关键词： pearl millet production options climate change nitrogen use efficiency radiation use efficiency

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Multiquadric Radial Basis Function Approximation Scheme for Solution of Total Variation Based Multiplicative Noise Removal Model

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Computer Modeling in Engineering & Sciences 2021年第1期126卷 55-88页

作者： Mushtaq Ahmad Khan Ahmed BAltamimi Zawar Hussain Khan Khurram Shehzad Khattak Sahib Khan asmat ullah Murtaza Ali University of Engineering and Technology Mardan23200Pakistan University of Hail HailSaudi Arabia University of Engineering and Technology Peshawar25000Pakistan Politecnico di Torino Torino10129Italy

This article introduces a fastmeshless algorithm for the numerical solution nonlinear partial differential equations(PDE)by Radial Basis Functions(RBFs)approximation connected with the Total Variation(TV)-basedminimization functional and to show its application to image denoising containing multiplicative *** capabilities used within the proposed algorithm have not only the quality of image denoising,edge preservation but also the property of minimization of staircase effect which results in blocky effects in the *** is worth mentioning that the recommended method can be easily employed for nonlinear problems due to the lack of dependence on a mesh or integration *** numerical investigations and corresponding examples prove the effectiveness of the recommended algorithm regarding the robustness and visual improvement as well as peak-signal-to-noise ratio(PSNR),signal-to-noise ratio(SNR),and structural similarity index(SSIM)corresponded to the current conventional TV-based schemes.

关键词： Denoised image multiplicative and speckle noises total variation(TV)filter Euler-Lagrange restoration equation multiquadric radial basis functions meshless and mesh-based schemes

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一种基于分数阶变分的乘性噪声图像去噪模型

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测绘工程 2016年第5期25卷 20-24,31页

作者：王田芳李浩 asmat ullah 周弈河海大学地球科学与工程学院江苏南京210098 河海大学力学与材料学院江苏南京210098

经典变分模型在去除乘性噪声的同时会产生纹理细节信息丢失现象。为解决这一问题,将分数阶变分模型与经典的TV模型相结合提出一种新的分数阶变分去噪模型,并利用梯度下降法求解该模型,数值实验表明:该模型较经典的去噪模型在去噪的同时... 详细信息

经典变分模型在去除乘性噪声的同时会产生纹理细节信息丢失现象。为解决这一问题,将分数阶变分模型与经典的TV模型相结合提出一种新的分数阶变分去噪模型,并利用梯度下降法求解该模型,数值实验表明:该模型较经典的去噪模型在去噪的同时可很好地保持图像边缘和纹理信息,同时对阶梯效应也有所抑制。

关键词：分数阶变分乘性噪声阶梯效应边缘保持纹理细节

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Expansion of human umbilical cord derived mesenchymal stem cells in regenerative medicine

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World Journal of Stem Cells 2024年第4期16卷 410-433页

作者： Shafiqa Naeem Rajput Bushra Kiran Naeem Anwar Ali asmat Salim Irfan Khan Dr.Panjwani Center for Molecular Medicine and Drug Research International Center for Chemical and Biological SciencesUniversity of KarachiKarachi 75270SindhPakistan Surgical Unit 4 Dr.Ruth KM Pfau Civil HospitalKarachi 74400Pakistan Department of Physiology University of KarachiKarachi 75270Pakistan Center for Regenerative Medicine and Stem Cells Research and Department of Ophthalmology and Visual SciencesThe Aga Khan UniversityKarachi 74800SindhPakistan

BACKGROUND Stem cells are undifferentiated cells that possess the potential for self-renewal with the capacity to differentiate into multiple *** humans,their limited numbers pose a challenge in fulfilling the necessary demands for the regeneration and repair of damaged tissues or *** suggested that mesenchymal stem cells(MSCs),necessary for repair and regeneration via transplantation,require doses ranging from 10 to 400 million ***,the limited expansion of MSCs restricts their therapeutic *** To optimize a novel protocol to achieve qualitative and quantitative expansion of MSCs to reach the targeted number of cells for cellular transplantation and minimize the limitations in stem cell therapy *** Human umbilical cord(hUC)tissue derived MSCs were obtained and *** cultured cells were subjected to the following evaluation pro-cedures:Immunophenotyping,immunocytochemical staining,trilineage differentiation,population doubling time and number,gene expression markers for proliferation,cell cycle progression,senescence-associatedβ-galactosidase assay,human telomerase reverse transcriptase(hTERT)expression,mycoplasma,cytomegalovirus and endotoxin *** Analysis of pluripotent gene markers Oct4,Sox2,and Nanog in recultured hUC-MSC revealed no significant *** immunophenotypic markers CD90,CD73,CD105,CD44,vimentin,CD29,Stro-1,and Lin28 were positively expressed by these recultured expanded MSCs,and were found negative for CD34,CD11b,CD19,CD45,and *** recultured hUC-MSC population continued to expand through passage *** gene expression of Pax6,BMP2,and TGFb1 showed no significant variation between recultured hUC-MSC ***,a significant increase(P<0.001)in the mitotic phase of the cell cycle was observed in recultured *** senescence markers(hTERT expression andβ-galactosidase activity)did not show any negative effect on recultured hUC-

关键词： Human umbilical cord Mesenchymal stem cells Expansion Cell proliferation In vitro expansion Senescence

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细胞骨架相关蛋白PDLIM5在人成纤维细胞内的定位及调控作用

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中国临床解剖学杂志 2022年第5期40卷 536-540页

作者：黄小兰彭彦杨宇超樊庭宇孙冰 asmat ullah Khan 戴景兴欧阳钧钟世镇南方医科大学基础医学院人体解剖学教研室暨广东省医学生物力学重点实验室广州510515

目的研究细胞骨架相关蛋白PDLIM5在人成纤维细胞内的定位及其调控作用。方法通过慢病毒转染下调PDLIM5在人成纤维细胞中的表达后,进行CCK8细胞增殖实验、细胞划痕实验、Transwell迁移实验来检测PDLIM5对细胞增殖和运动迁移能力的影响,... 详细信息

目的研究细胞骨架相关蛋白PDLIM5在人成纤维细胞内的定位及其调控作用。方法通过慢病毒转染下调PDLIM5在人成纤维细胞中的表达后,进行CCK8细胞增殖实验、细胞划痕实验、Transwell迁移实验来检测PDLIM5对细胞增殖和运动迁移能力的影响,通过免疫荧光染色来观察PDLIM5的亚细胞定位。结果下调PDLIM5表达后抑制了人成纤维细胞的增殖、运动和迁移能力,免疫荧光发现PDLIM5主要表达在细胞质并定位于微丝。结论 PDLIM5定位于细胞骨架微丝,下调PDLIM5表达可抑制人成纤维细胞的增殖、运动和迁移能力。

关键词：人成纤维细胞 PDLIM5 微丝细胞骨架相关蛋白

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An Energy-Efficient 12b 2.56 MS/s SAR ADC Using Successive Scaling of Reference Voltages

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Computers, Materials & Continua 2022年第7期72卷 2127-2139页

作者： Hojin Kang Syed asmat Ali Shah HyungWon Kim Department of Electronics Engineering College of Electrical and Computer EngineeringChungbuk National UniversityCheongju28644Korea Department of Electrical and Computer Engineering COMSATS University IslamabadAbbottabad CampusAbbottabad22060Pakistan

This paper presents an energy efficient architecture for successive approximation register(SAR)analog to digital converter(ADC).SAR ADCs with a capacitor array structure have been widely used because of its simple architecture and relatively high ***,conventional SAR ADCs consume relatively high energy due to the large number of capacitors used in the capacitor array and their sizes scaled up along with the number of *** proposed architecture reduces the energy consumption as well as the capacitor size by employing a new array architecture that scales down the reference voltages instead of scaling up the capacitor *** proposed 12-bit SAR ADC is implemented in Complementary Metal Oxide Semiconductor(CMOS)0.13 um library using Cadence Virtuoso design *** results and mathematical model demonstrate the overall energy savings of up to 97.3%compared with conventional SAR ADC,67%compared with the SAR ADC with split capacitor,and 35%compared with the resistor and capacitor(R&C)Hybrid SAR *** ADC achieves an effective number of bits(ENOB)of 11.27 bits and consumes 61.7 uW at sampling rate of 2.56 MS/s,offering an energy consumption of 9.8 fJ per conversion *** proposed SAR ADC offers 95.5%reduction in chip core area compared to conventional architecture,while occupying an active area of 0.088 mm2.

关键词： Low voltage low power successive approximation register analog to digital converter switching energy

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Mimicking peroxidase active site microenvironment by functionalized graphene quantum dots

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Nano Research 2020年第5期13卷 1427-1433页

作者： Qi Xin Xinrui Jia asmat Nawaz Wenjing Xie Litao Li Jian Ru Gong CAS Center of Excellence for Nanoscience CAS Key Laboratory for Nanosystem&Hierarchical FabricationNational Center for Nanoscience and Technology11 Beiyitiao ZhongguancunBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China Department of Orthopaedics the 309th Hospital of the PLABeijing 100091China

The development of high-efficiency peroxidase mimetics is highly desirable in view of high cost and low stability of natural *** the perspective of mimicking active site microenvironment at low cost,we herein report a novel histidine-functionalized graphene quantum dot(His-GQD)/hemin complex,which exhibits the highest catalytic rate for the peroxidase-based chromogenic reaction among the hemin-containing mimetics reported so ***,our peroxidase mimetic shows excellent tolerance to strongly acidic conditions and can function in a wide temperature ***-Burk plots and comprehensive electron paramagnetic resonance analysis reveal a ping-pong type catalytic mechanism for this *** addition,His-GQD/hemin demonstrates high efficiency and accuracy in detecting H2O2 and blood *** work provides an effective design of artificial enzymes for practical applications.

关键词： nanoenzyme graphene quantum dot heme active site peroxidase mimetic enzymatic microenvironment

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Regulating the fate of stem cells for regenerating the intervertebral disc degeneration

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World Journal of Stem Cells 2021年第12期13卷 1881-1904页

作者： Sobia Ekram Shumaila Khalid asmat Salim Irfan Khan Dr.Panjwani Center for Molecular Medicine and Drug Research International Center for Chemical and Biological SciencesUniversity of KarachiKarachi 75270SindhPakistan

Lower back pain is a leading cause of disability and is one of the reasons for the substantial socioeconomic *** etiology of intervertebral disc(IVD)degeneration is complicated,and its mechanism is still not completely *** such as aging,systemic inflammation,biochemical mediators,toxic environmental factors,physical injuries,and genetic factors are involved in the progression of its ***,no therapy for restoring degenerated IVD is available except pain management,reduced physical activities,and surgical ***,it is imperative to establish regenerative medicine-based approaches to heal and repair the injured disc,repopulate the cell types to retain water content,synthesize extracellular matrix,and strengthen the disc to restore normal spine *** therapy has gained attention for IVD management as an alternative therapeutic *** this review,we present an overview of the anatomical and molecular structure and the surrounding pathophysiology of the *** therapeutic approaches,including proteins and growth factors,cellular and gene therapy,and cell fate regulators are ***,small molecules that modulate the fate of stem cells for their differentiation into chondrocytes and notochordal cell types are highlighted.

关键词： Stem cell Intervertebral disc Degeneration Inflammation Cell therapy Gene modification

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