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Molecular dispersion enhances photovoltaic efficiency and thermal stability in quasi-bilayer organic solar cells

Science China Chemistry 2021年第1期64卷 116-126页

作者： Xuning Zhang Yanxun Li Dongyang Zhang Guangbao Wu Hong Zhang Jiyu Zhou Xing Li saud-uz-zafar Jianqi Zhang Zhixiang Wei Huiqiong Zhou Yuan Zhang School of Chemistry\Beijing Advanced Innovation Center fo r Biomedical Engineering.Beihang University Beijing 100191China CAS Key Laboratory of Nanosvstem and Hierarchical Fabrication CAS Center for Excellence in NanoscienceNational Center for Nanoscience and TechnologyBeijing 100190China

In comparison to widely adopted bulk heterojunction(BHJ)structures for organic solar cells(OSC),exploiting the sequential deposition to form planar heterojunction(PHJ)structures enables to realize the favorable vertical phase separation to facilitate charge extraction and reduce charge recombination in ***,effective tunings on the power conversion efficiency(PCE)in PHJ-OSCs are still restrained by the currently available *** on a polymeric donor PBDBT-2 F(PBDBT=Poly[[4,8-bis[5-(2-ethylhexyl)-4-fluoro-2-thienyl]benzo[1,2-b:4,5-b′]dithiophene-2,6-diyl]-2,5-thiophenediyl[5,7-bis(2-ethylhexyl)-4,8-dioxo-4 H,8 H-benzo[1,2-c:4,5-c′]dithiophene-1,3-diyl]-2,5-thiophenediyl])and a non-fullerene(NF)acceptor Y6,we proposed a strategy to improve the properties of photovoltaic performances in PHJ-based OSCs through dilute dispersions of the PBDBT-2 F donor into the acceptor-dominant phase with the sequential film *** the control of donor dispersions,the charge transport balance in the PHJ-OSCs is improved,leading to the expedited photocarrier sweep-out with reduced bimolecular charge *** a result,a PCE of 15.4%is achieved in the ***,the PHJ solar cells with donor dispersions exhibit better thermal stability than corresponding BHJ devices,which is related to the better film morphology robustness and less affected charge sweep-out during the thermal aging.

关键词： diluted donor dispersion sequential film deposition vertical phase separation thermal stability

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CNN Channel Attention Intrusion Detection SystemUsing NSL-KDD Dataset

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Computers, Materials & Continua 2024年第6期79卷 4319-4347页

作者： Fatma S.Alrayes Mohammed Zakariah Syed Umar Amin zafar Iqbal Khan Jehad Saad Alqurni Information Systems Department College of Computer and Information SciencesPrincess Nourah bint Abdulrahman UniversityRiyadh11671Saudi Arabia College of Computer and Information Sciences King Saud UniversityRiyadh11362Saudi Arabia College of Computer and Information Sciences Prince Sultan UniversityRiyadh11586Saudi Arabia Department of Educational Technologies College of EducationImam Abdulrahman Bin Faisal UniversityP.O.Box 1982Dammam31441Saudi Arabia

Intrusion detection systems(IDS)are essential in the field of cybersecurity because they protect networks from a wide range of online *** goal of this research is to meet the urgent need for small-footprint,highly-adaptable Network Intrusion Detection Systems(NIDS)that can identify *** NSL-KDD dataset is used in the study;it is a sizable collection comprising 43 variables with the label’s“attack”and“level.”It proposes a novel approach to intrusion detection based on the combination of channel attention and convolutional neural networks(CNN).Furthermore,this dataset makes it easier to conduct a thorough assessment of the suggested intrusion detection ***,maintaining operating efficiency while improving detection accuracy is the primary goal of this ***,typical NIDS examines both risky and typical behavior using a variety of *** the NSL-KDD dataset,our CNN-based approach achieves an astounding 99.728%accuracy rate when paired with channel *** to previous approaches such as ensemble learning,CNN,RBM(Boltzmann machine),ANN,hybrid auto-encoders with CNN,MCNN,and ANN,and adaptive algorithms,our solution significantly improves intrusion detection ***,the results highlight the effectiveness of our suggested method in improving intrusion detection precision,signifying a noteworthy advancement in this *** efforts will focus on strengthening and expanding our approach in order to counteract growing cyberthreats and adjust to changing network circumstances.

关键词： Intrusion detection system(IDS) NSL-KDD dataset deep-learning machine-learning CNN channel Attention network security

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Network Security Enhanced with Deep Neural Network-Based Intrusion Detection System

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Computers, Materials & Continua 2024年第7期80卷 1457-1490页

This study describes improving network security by implementing and assessing an intrusion detection system(IDS)based on deep neural networks(DNNs).The paper investigates contemporary technical ways for enhancing intrusion detection performance,given the vital relevance of safeguarding computer networks against harmful *** DNN-based IDS is trained and validated by the model using the NSL-KDD dataset,a popular benchmark for IDS *** model performs well in both the training and validation stages,with 91.30%training accuracy and 94.38%validation ***,the model shows good learning and generalization capabilities with minor losses of 0.22 in training and 0.1553 in ***,for both macro and micro averages across class 0(normal)and class 1(anomalous)data,the study evaluates the model using a variety of assessment measures,such as accuracy scores,precision,recall,and F1 *** macro-average recall is 0.9422,the macro-average precision is 0.9482,and the accuracy scores are ***,macro-averaged F1 scores of 0.9245 for class 1 and 0.9434 for class 0 demonstrate the model’s ability to precisely identify anomalies *** research also highlights how real-time threat monitoring and enhanced resistance against new online attacks may be achieved byDNN-based intrusion detection systems,which can significantly improve network *** study underscores the critical function ofDNN-based IDS in contemporary cybersecurity procedures by setting the foundation for further developments in this *** research aims to enhance intrusion detection systems by examining cooperative learning techniques and integrating up-to-date threat knowledge.

关键词： Machine-Learning Deep-Learning intrusion detection system security privacy deep neural network NSL-KDD Dataset

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Combined Application of Biostimulants and EDTA Improved Wheat Productivity under Cadmium Stress

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Phyton-International Journal of Experimental Botany 2024年第7期93卷 1647-1665页

作者： Abida Aziz Shafiqa Bano Mubshar Hussain Muhammad Farooq Azhar Ghulam Yasin Naila Hadayat Iqra Arooj Abeer Hashem Ajay Kumar Elsayed Fathi Abd_Allah Qamar uz Zaman Department of Botany The Women UniversityMultan54500Pakistan Institute of Agronomy Bahauddin Zakariya UniversityMultan60800Pakistan Department of Forestry and Range Management Bahauddin Zakariya UniversityMultan60800Pakistan Department of Botany Division of Science&TechnologyUniversity of EducationLahore54770Pakistan Department of Microbiology&Molecular Genetics The Women UniversityMultan54500Pakistan Botany and Microbiology Department College of ScienceKing Saud UniversityRiyadh201313Saudi Arabia Amity Institute of Biotechnology Amity UniversityNoida201313India Plant Production Department College of Food and Agricultural SciencesKing Saud UniversityRiyadh11451Saudi Arabia School of Agriculture Yunnan UniversityKunmingYunan650504China Department of Environmental Sciences The University of LahoreLahore54590Pakistan

Wheat(Triticum aestivum L.)exhibits a greater capacity for cadmium(Cd)absorption compared to other cereal crops,leading to elevated daily Cd intake,and posing a signiﬁcant threat to public *** the mitigation of Cd stress in sustainable and environmentally friendly way,a pot study was designed by using exogenous application of various biostimulants,i.e.,Nigella sativa and Ocimum sanctum extracts:0%,10%,and 20%in combination with the chelating agent ethylenediaminetetraacetic acid(EDTA)using 0 and 5 mg kg^(-1) under various levels of Cd stress(i.e.,0,5,10,and 15 mg kg^(-1) soil).Results revealed that Cd stress signiﬁcantly reduced the seed emergence,growth,root,and allometric characters and yield-related parameters of wheat *** most observable reduc-tion was documented in wheat plants exposed to a higher Cd concentration(15 mg kg^(-1)),followed by the lower Cd level(control).The combined application of bio-stimulants and EDTA minimized the negative impacts of Cd *** highest increase in seedling emergence(5.44%),leaf area(50.60%),number of tillers(31.02%),grain yield per plant(24.28%),biological yield(13.97%),and decrease in Cd levels in grains(40%)was noticed where 20%foliar application of *** and 10%of *** biostimulants were done using 5 mg kg^(-1) of soil-applied *** intervention demonstrated a notable reduction in Cd-induced negative effects,highlighting the potential of these substances in promoting sustainable wheat cultivation in contaminated ***,it is an eco-friendly and approachable method at theﬁeld level able to ensure food safety.

关键词： Abiotic stress allometric characters antioxidant activity crop yield seed emergence grain yield

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β-丙氨酸作为有机太阳能电池双重修饰添加剂的研究

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高等学校化学学报 2023年第9期44卷 218-230页

作者： zafar saud uz 张伟超杨朔李世麟张莹玉张渊张弘周惠琼中国科学院大学中国科学院纳米系统与多级次制造重点实验室中国科学院纳米科学卓越中心国家纳米科学与技术中心北京100190 北京航空航天大学化学学院北京100191 北京廷润膜技术开发股份有限公司北京101100

β-丙氨酸分子的两侧分别为1个羟基(—OH)/羧基(—COOH)和1个胺基(—NH_2),这使其成为一种理想的双修饰剂.本文将双修饰技术应用于空穴传输层[HTL,聚(3,4-乙烯二氧噻唑)∶聚(苯乙烯磺酸盐)(PEDOT∶PSS)]以及电子传输层(ETL),并通过简单... 详细信息

β-丙氨酸分子的两侧分别为1个羟基(—OH)/羧基(—COOH)和1个胺基(—NH_2),这使其成为一种理想的双修饰剂.本文将双修饰技术应用于空穴传输层[HTL,聚(3,4-乙烯二氧噻唑)∶聚(苯乙烯磺酸盐)(PEDOT∶PSS)]以及电子传输层(ETL),并通过简单的溶液处理技术将聚(9,9-双(3'-(N,N-二甲基)-N-乙基氨丙基-2,7-芴)-2,7-(9,9-二辛基芴))二溴化物(PFN-Br)加入同一装置中,从而合成了新界面层.将甲醇和水作为极性溶剂,使β-丙氨酸成为可溶解的化合物.通过这种双重修饰方法,PM6∶Y6太阳能电池的光电转换效率(PCE)从14.99%提高到15.78%.接触角测量和傅里叶变换红外光谱(FTIR)表征结果表明,两层界面都得到了增强的疏水性,从而避免了水分和氧气与它们各自的电极发生作用.利用原子力显微镜对表面形貌进行了分析.结果表明,β-丙氨酸的胺基与PSS的—SO_(3)^(-)基团以及PFN-Br的金属离子相互作用,从而降低了它们的浓度,提高了疏水性,改善了OSC的稳定性.空间电荷限制电流(SCLC)测量发现,双修饰方法可以改善修饰后器件的载流子迁移率.

关键词： β-丙氨酸添加剂界面改性传输层有机太阳能电池

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β-丙氨酸作为有机太阳能电池双重修饰添加剂的研究（英文）

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高等学校化学学报 2023年第9期 171-183页

作者： zafar saud uz 张伟超杨朔李世麟张莹玉张渊张弘周惠琼中国科学院大学北京航空航天大学化学学院北京廷润膜技术开发股份有限公司

β-丙氨酸分子的两侧分别为1个羟基(—OH)/羧基(—COOH)和1个胺基(—NH2),这使其成为一种理想的双修饰剂.本文将双修饰技术应用于空穴传输层[HTL,聚(3,4-乙烯二氧噻唑)∶聚(苯乙烯磺酸盐)(PEDOT∶PSS)]以及电子传输层(ETL),并通过简单... 详细信息

β-丙氨酸分子的两侧分别为1个羟基(—OH)/羧基(—COOH)和1个胺基(—NH2),这使其成为一种理想的双修饰剂.本文将双修饰技术应用于空穴传输层[HTL,聚(3,4-乙烯二氧噻唑)∶聚(苯乙烯磺酸盐)(PEDOT∶PSS)]以及电子传输层(ETL),并通过简单的溶液处理技术将聚(9,9-双(3’-(N,N-二甲基)-N-乙基氨丙基-2,7-芴)-2,7-(9,9-二辛基芴))二溴化物(PFN-Br)加入同一装置中,从而合成了新界面层.将甲醇和水作为极性溶剂,使β-丙氨酸成为可溶解的化合物.通过这种双重修饰方法,PM6∶Y6太阳能电池的光电转换效率(PCE)从14.99%提高到15.78%.接触角测量和傅里叶变换红外光谱(FTIR)表征结果表明,两层界面都得到了增强的疏水性,从而避免了水分和氧气与它们各自的电极发生作用.利用原子力显微镜对表面形貌进行了分析.结果表明,β-丙氨酸的胺基与PSS的—SO3-基团以及PFN-Br的金属离子相互作用,从而降低了它们的浓度,提高了疏水性,改善了OSC的稳定性.空间电荷限制电流(SCLC)测量发现,双修饰方法可以改善修饰后器件的载流子迁移率.

关键词： β-丙氨酸添加剂界面改性传输层有机太阳能电池

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Polyimides Based on Flexible Diamines:Synthesis, Characterization and Thermal Properties

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复旦学报（自然科学版） 2007年第5期46卷 617-页

作者： M.Saeed Butt Zareen Akhtar M.zafar-uz-Zaman Arshad Munir Department of Chemistry Quaid-i-Azam UniversityIslamabad-45320 Pakistan National Engineering and Scientific Commission P.O.Box 2801 Islamabad Pakistan

1 Results and DiscussionTwo diamines 1,4-phenylene di(oxy-4,4′-aniline) and 4-aminophenyloxy-N-4-[(4-amiophenyloxy)benzylidene]aniline were prepared via the nucleopilic substitution reaction and were polymerized with 3,3′,4,4′-benzophenonetetracarboxylic acid dianhydride (BP), 4,4′-(hexafluoroisopropylidene)diphthalic anhydride (HF) , 3,4,9,10-perylenetetracarboxylic acid dianhydride (PD) and pyromellitic dianhydride (PMDA) either by one step solution polymerization reaction or two step procedure. The l...

关键词： polyimides ether diamines solubility thermal stability

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Application of Zinc, Iron and Boron Enhances Productivity and Grain Biofortification of Mungbean

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Phyton-International Journal of Experimental Botany 2023年第4期92卷 983-999页

作者： Muhammad zafar Siraj Ahmed Muhammad Kashif Munir Nawal zafar Muhammad Saqib Muhammad Aleem Sarwar Saba Iqbal Baber Ali Naveed Akhtar Basharat Ali Sadam Hussain Muhammad Saeed Mohammad Khalid Al-Sadoon Aneela Gulnaz Agronomic Research Institute Ayub Agricultural Research Institute FaisalabadFaisalabad38000Pakistan Soil and Water Testing Laboratory Ayub Agricultural Research Institute FaisalabadFaisalabad38000Pakistan Department of Plant Sciences Quaid-i-Azam UniversityIslamabad45320Pakistan Department of Agricultural Engineering Khwaja Fareed University of Engineering and TechnologyRahim Yar Khan64200Pakistan College of Agronomy Northwest A&F UniversityYangling712100China Plant Pathology Research Institute Faisalabad38000Pakistan Department of Zoology College of ScienceKing Saud UniversityRiyadh11451Saudi Arabia Department of Biotechnology Yeungnam UniversityGyeongsan38641Korea

Deficiencies of essential vitamins,iron(Fe),and zinc(Zn)affect over one-half of the world’s population.A significant progress has been made to control micronutrient deficiencies through supplementation,but new approaches are needed,especially to reach the rural *** biofortification of pulses with Zn,Fe,and boron(B)offers a pragmatic solution to combat hidden hunger instead of food fortification and ***,it also has positive effects on crop production as ***,we conducted three separate field experiments for two consecutive years to evaluate the impact of soil and foliar application of the aforementioned nutrients on the yield and seed biofortification of *** application of Zn at 0,4.125,8.25,Fe at 0,2.5,5.0 and B at 0,0.55,1.1 kg ha−1 was done in the first,second and third experiment,*** application in these experiments was done at 0.3%Zn,0.2%Fe and 0.1%B respectively one week after flowering *** revealed that soil-applied Zn,Fe and B at 8.25,5.0 and 1.1 kg ha−1,respectively,enhanced the grain yield of mungbean;however,this increase in yield was statistically similar to that recorded with Zn,Fe and B at 4.125,2.5 and 0.55 kg ha−1,*** application of these nutrients at flower initiation significantly enhanced the Zn contents by 28%and 31%,Fe contents by 80%and 78%,while B contents by 98%and 116%over control during 2019 and 2020,*** was concluded from the results that soil application of Zn,Fe,and B enhanced the yield performance of mungbean;while significant improvements in seed Zn,Fe,and B contents were recorded with foliar application of these nutrients.

关键词： Biofortification seed biofortification mungbean iron zinc boron foliar application

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Characterization of Nano-Silica Local Metakaolin Based-Geopolymer: Microstructure and Mechanical Properties

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Open Journal of Civil Engineering 2020年第2期10卷 143-161页

作者： Zeineb Zidi Mounir Ltifi Idrees zafar Laboratory of Physics of Materials and Nanomaterials Applied to Environment (LaPhyMNE) Faculty of Sciences of Gabes Gabes University Gabes Tunisia Department of Civil Engineering College of Engineering Al Imam Mohammad Ibn Saud Islamic University Riyadh KSA Department of Civil engineering National Engineering School of Gabes Gabes University Gabes Tunisia

The current study focused on the utilization of local clay for synthesis and characterization of meta-kaolin based geopolymers with and without nano-silica. The control geopolymers, for a compressive strength of 30 MPa, were optimized by using Liquid/Solid ratio of 0.55, NaOH concentration of 10 M and curing at 80°C. The nano silica was added in an extended range of 1%, 2%, 3%, 5%, 7% and 10%. The synthesized nano-silica metakaolin based geopolymers was investigated by using compressive strength, XRD, XRF, FTIR, SEM, MIP, TG, UV/VIS spectroscopy, in addition to density, water absorption and initial setting times. The results indicated an increase in the compressive strength value with the incorporation of nano-silica in geopolymer mixes until the optimum percentage of 5%, while the 10% addition of nano-silica decreased the compressive strength by 5% as compared to the control geopolymer. The increase in the compressive strength was accredited to the increase in the content of N-A-S-H gel and the amorphous structure as shown by XRD and FTIR analysis. In addition, the optical transmittance analysis, MIP and SEM scans along with the results of density and water absorption have clearly shown the densification of the matrix formed for the optimal percentage of nano-silica. However, the initial setting time was found to reduce substantially with increase of nano-silica content. Moreover, the TG results have shown the 5% nano-added geopolymers to have greater thermal stability as compared to reference geopolymers

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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

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