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Vinylene π-bridge: A simple building block for ultra-narrow bandgap nonfullerene acceptors enable 14.2% efficiency in binary organic solar cells

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Dyes and Pigments 2021年 188卷 109171-109171页

作者： Hai, Jiefeng Zhao, Wenhua Luo, Siwei Yu, Han Chen, Honggang Lu, Zhenhuan Li, Ling Zou, Yingping Yan, He Guangxi Key Laboratory of Electrochemical and Magneto-chemical Functional Materials Guilin University of Technology GuilinGuangxi541004 China HKUST-Shenzhen Research Institute No. 9 Yuexing 1st Road Hi-tech Park Nanshan Shenzhen518057 China College of Chemistry and Chemical Engineering Central South University ChangshaHunan410083 China

Ultra-narrow bandgap (ultra-NBG) nonfullerene acceptors (NFAs) are essential for advancing the development of organic solar cells (OSCs). In this paper, a synergistic strategy of π-bridge and asymmetric engineering is applied to state-of-the-art Y-series NFAs, and it achieves ultra-NBG NFAs for efficient OSCs. Introduction of vinylene π bridges into the Y-series NFA in a symmetric pattern, resulting in a molecule, BTP-2V-2F, which exhibits moderate power conversion efficiency (PCE) of 11%, despite extending absorption near-infrared wavelength range. Through tailoring the number of vinylene π-bridges in the asymmetric backbone, another molecule, BTP-1V-2F, results which not only shows near-infrared absorption improvement, but also low-lying frontier molecular orbital levels. Benefiting from the maintained photocurrent along with the higher open-circuit voltage and the fill factor, a superior efficiency of 14.24% is achieved, which is one of the highest values for binary single-junction OSCs based on ultra-NBG NFA with a bandgap below 1.29 eV. The results demonstrate that the effectiveness of the vinylene π-bridge and asymmetric engineering on designing ultra-NBG NFAs, which aids the avenue toward developing more efficient ultra-NBG-based OSCs. © 2021

关键词： Organic solar cells

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Correction to: Strategy for the design of a bioreactor for L-lysine immobilized fermentation using Corynebacterium glutamicun

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Applied microbiology and biotechnology 2023年第15期107卷 4987页

作者： Gang Meng Wei Zhao Qingguo Liu Chunguang Zhao Yannan Zou Nan Zhao Dong Liu Hanjie Ying Wenjun Sun Yong Chen College of Biotechnology and Pharmaceutical Engineering Nanjing Tech University Nanjing China. Ningxia Yipin Biotechnology Co. Ltd Yinchuan China. Nanjing Hi-Tech Biological Technology Research Institute Co. Ltd Nanjing China. College of Biotechnology and Pharmaceutical Engineering Nanjing Tech University Nanjing China. sunwenjun@***. College of Biotechnology and Pharmaceutical Engineering Nanjing Tech University Nanjing China. chenyong1982@***.

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NiOx Thickness Dependent Improvement of NiOx/Perovskite Interface for Inverted Planar Perovskite Solar Cells

SSRN

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SSRN 2022年

作者： Zhang, Wei Shen, Honglie Xu, Binbin Zhang, Jingzhe Zhang, Jiafan Lu, Linfeng Zhu, Xiangrong Li, Dongdong College of Science Jiangsu Key Laboratory of Materials and Technology for Energy Conversion Nanjing University of Aeronautics and Astronautics Nanjing210016 China The Interdisciplinary Research Center Shanghai Advanced Research Institute Chinese Academy of Sciences 99 Haike Road Zhangjiang Hi-Tech Park Pudong Shanghai201210 China Jiangsu Collaborative Innovation Center of Photovoltaic Science and Engineering Changzhou University Changzhou213164 China School of Energy and Materials Shanghai Polytechnic University Shanghai201209 China

Sputtered nickel oxide (NiOx) as hole transport layer (HTL) could easily realize the large-area uniformity, as well as reduce the fabrication cost for metal-halide perovskite solar cells (PSCs). However, nonradiative recombination losses at the interface between NiOx and perovskite (PVK) lead to an open-circuit voltage (Voc) deficit, which is an important limiting factor for the improvement of power conversion efficiency (PCE). To address this situation, we report a strategy of improving the energy band matching at the NiOx/PVK interface by the simple thickness control of NiOx. Combined experimental and numerical simulation results indicate that the suitable thickness reduces the valence band barrier at NiOx and PVK interface and expedites the charge carrier collection. Consequently, the Voc of the inverted p-i-n PSC increased from 940 mV to 1050 mV, while PCE increased from 13.9% to 16.1%. Overall, these findings provide critical insights for improved holes transport at the interface between the NiOx and perovskite thin film, and the fabrication of highly efficient, robust, and large-area perovskite optoelectronic devices. © 2022, The Authors. All rights reserved.

关键词： Perovskite solar cells

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Hybrid random under-sampling approach in MRI compressed sensing 4th

Hybrid random under-sampling approach in MRI compressed sens...

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4th International Conference on Research in Intelligent and Computing in engineering, RICE 2019

作者： Nguyen, Thang Van Huy, Tran Quang Nguyen, Van Dung Thu, Nguyen Thi Anh, Gian Quoc Tan, Tran Duc ThuyLoi University Hanoi Viet Nam Faculty of Physics Hanoi Pedagogical University 2 XuanhoaVinhphuc Viet Nam NTT Hi-Tech Institute Nguyen Tat Thanh University Ho Chi Minh City Viet Nam Hanoi University of Industry Hanoi Viet Nam Nam Dinh University of Technology Education Nam Định Viet Nam VNU University of Engineering & Technology Hanoi Viet Nam

ISBN: (纸本)9789811527791

Compressive sampling has been commonly employed in the field of magnetic resonance imaging (MRI) to accurately reconstruct sparse and compressive signals. In MRI acquisition, a large amount of encoded information focuses on the origin of the k-space. With a fixed compression ratio: (a) in the traditional random under-sampling approach, the sampled horizontal lines in the binary mask are completely based on the power law;(b) in the proposed hybrid random under-sampling approach, the total number of sampled horizontal lines is divided into two parts, the large first part is still based on the power law, while the small other part is enhanced with the remaining lines which are near the origin of k-space. Because the amount of encoded information is concentrated at the origin of the k-space, the proposed method suggests that the amount of useful information will be collected more and therefore the MRI image recovery will be more accurate. The numerical simulation consequences pointed out that the average error of the appointed scheme decreased by 17.78%, compared to the traditional scheme. © Springer Nature Singapore Pte Ltd. 2020.

关键词： Compressed sensing

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Investigation of the thermal and mechanical behavior of recycled low-density polyethylene/Hemp fiber composites containing paraffin wax

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Materials Today: Proceedings 2023年

作者： N. Atthikumaran K. Kannakumar P. Kanakarajan S. Sathishkumar I. Augastin Santhiyagu Sk. Hasane Ahammad Department of Civil Engineering Nandha College of Technology Perundurai 638 052 Tamilnadu India Department of Mechanical Engineering Shree Venkateshwara Hi-Tech Engineering College Erode 638 455 Tamilnadu India Department of Mechanical Engineering K S R Institute for Engineering and Technology Tiruchengode 637 215 Tamilnadu India Department of Mechanical Engineering M.A.M College of Engineering and Technology Tiruchirapalli 621 105 Tamilnadu India Department of Electronics and Communication Engineering Koneru Lakshmaiah Education Foundation Vaddeswaram 522 302 Andhra Pradesh India

In this research, the thermal and mechanical properties of Low-density polyethylene (LDPE)/Hemp fibre composites were analyzed to determine if maleic anhydride-grafted hard paraffin wax (MA-g-wax) and oxidized hard paraffin wax (Ox-Wax) might be used as compatibilizers. The differential scanning calorimetry (DSC) results indicates that adding Hemp by itself had no effect on the crystallization behavior of LDPE, but that adding wax to LDPE or having Hemp present both affected the crystallization behavior of LDPE in different ways. Both the waxes' varying compatibility with LDPE and the preference for crystallization around the short Hemp fibres appear to play a role in the latter's thermal characteristics. The TGA data demonstrates that both waxes contribute to greater thermal stability in the blends, with LDPE/Ox-Wax exhibiting the most improvement. However, using wax in the mix reduced the LDPE/Hemp/wax thermal stability of the composites. When added to composites, Ox-Wax and MA-g-wax produced identical results in terms of tensile strength. While the compatibilized composites' modulus was increased by both waxes, they decreased the tensile strengths in both cases, most likely because of the poor adhesion between LDPE and the waxes.

关键词： LDPE Properties Composites Functionalized waxes Hemp fiber Morphology

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An improved approach for cluster newton method in parameter identification for pharmacokinetics 4th

An improved approach for cluster newton method in parameter ...

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4th International Conference on Research in Intelligent and Computing in engineering, RICE 2019

作者： Van Nguyen, Thang Huy, Tran Quang Nguyen, Van Dung Thu, Nguyen Thi Tan, Tran Duc ThuyLoi University Hanoi Viet Nam Faculty of Physics Hanoi Pedagogical University 2 XuanhoaVinhphuc Viet Nam NTT Hi-Tech Institute Nguyen Tat Thanh University Ho Chi Minh City Viet Nam Hanoi University of Industry Hanoi Viet Nam Faculty of Electronics & Telecommunications VNU University of Engineering & Technology Hanoi Viet Nam

ISBN: (纸本)9789811527791

This paper proposes an improved scheme for the original cluster Newton method to contemporaneously find multiple solutions for inverse parameter identification in pharmacokinetics by applying Tikhonov regularization for fitting a super plane in the CN method. The numerical experiments of the proposed approach have proven that when using these proposed approaches, we can (i) save iterations;(ii) save computation time;and (iii) the cluster of points moves more stably toward the manifold of solutions. © Springer Nature Singapore Pte Ltd. 2020.

关键词： Newton-Raphson method

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Extraction and determination of antioxidant activity of vietnamese butterfly pea (Clitoria ternatia L.) 2nd

Extraction and determination of antioxidant activity of viet...

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2nd International Conference on Metal Material Processes and Manufacturing, ICMMPM 2019

作者： Duy, Nguyen Quoc Hao, Nguyen Thi My Lam, Tri Duc Pham, Tri Nhut Thanh, Tran Trung Faculty of Chemical Engineering and Food Technology Nguyen Tat Thanh University Ho Chi Minh City Viet Nam NTT Hi-Tech Institute Nguyen Tat Thanh University Ho Chi Minh City Viet Nam Center of Excellence for Biochemistry and Natural Products Nguyen Tat Thanh University Ho Chi Minh City Viet Nam

ISBN: (纸本)9783035716320

The objective of this study was to determine the optimal value of factors affecting the antioxidant activity extraction of antioxidant activity of butterfly pea flowers. The investigated factors included extraction temperatures (30, 40, 50, 60, 70 and 80°C), extraction time (30, 60, 90, 120 and 150 minutes) and solid to solvent ratio (1:05, 1:10, 1:20, 1:40 and 1:50 g/mL). The efficiency of extraction was evaluated based on antioxidant activities which were measured by DPPH (2,2-diphenyl-1-picrylhydrazyl) free radical scavenging assay and ferric reducing antioxidant power assay (FRAP). The results showed that when the extraction process was performed at temperatures of 60°C, the resulting extracts with highest DPPH antioxidant activity (575.10 µmolTE/L) and FRAP (1093.83 µmolTE/L) was obtained. Considering the effect of extraction time on antioxidant activities of butterfly pea, time range of 30–90 minutes led to highest DPPH values while extracts with highest FRAP power were collected after 120 minutes. Moreover, decreasing solid-to-solvent ratio resulted in the decline in antioxidant activities. © 2020 Trans tech Publications Ltd, Switzerland.

关键词： Extraction

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Effects of extraction conditions on antioxidant activities of roselle (hibiscus sabdariffa L.) extracts 2nd

Effects of extraction conditions on antioxidant activities o...

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2nd International Conference on Metal Material Processes and Manufacturing, ICMMPM 2019

作者： Duy, Nguyen Quoc Pham, Tri Nhut Binh, Mai Le Thanh Thuan, Ma Van, Ngo Thi Thanh Lam, Tri Duc Nhan, Phu Nguyen Thuong Faculty of Chemical Engineering and Food Technology Nguyen Tat Thanh University Ho Chi Minh City Viet Nam NTT Hi-Tech Institute Nguyen Tat Thanh University Ho Chi Minh City Viet Nam Center of Excellence for Biochemistry and Natural Products Nguyen Tat Thanh University Ho Chi Minh City Viet Nam

ISBN: (纸本)9783035716320

The objective of this study was to determine the optimal value of factors affecting the extraction of antioxidant activity of Roselle calyces. The investigated factors included extraction temperatures (30, 40, 50, 60, 70 and 80°C), extraction time (30, 60, 90, 120 and 150 minutes) and solid to solvent ratio (1:5, 1:10, 1:20, 1:40 and 1:50 g/mL). The efficiency of extraction was evaluated based on antioxidant activities which were measured by DPPH (2,2-diphenyl-1-picrylhydrazyl) free radical scavenging assay, ferric reducing antioxidant power assay (FRAP). The results showed that when the extraction temperature range of 70–80°C, DPPH free radical scavenging and FRAP were highest with 677.47–725.81 µmolTE/L and 4186.91–4391.62 µmolTE/L, respectively. For the extraction time from 120 to 150 minutes, the resulting extracts with highest FRAP and DPPH free radical scavenging antioxidant capacity were obtained. Meanwhile, the antioxidant activity tended to decrease as the solvent/solid ratio increased. © 2020 Trans tech Publications Ltd, Switzerland.

关键词： Extraction

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Ega-Net: Appearance-Based Eye Gaze Estimation Using an Efficient Gaze Network with Attention Mechanism

SSRN

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SSRN 2023年

作者： Wu, Xinmei Li, Lin Zhu, Haihong Zhou, Gang Li, Linfeng Su, Fei He, Shen Wang, Yanggang Long, Xue School of Resource and Environmental Sciences Wuhan University 129 Luoyu Road Wuhan430079 China Wuhan Highway Technology Corporation East Lake Hi-Tech Development Zone Building B3 Zone 2 Hangyu WHU Sci-Park Wudayuan Road Wuhan China School of Surveying and Geo-Informatics Shandong Jianzhu University Jinan250101 China Wuhan Metro Operation Co. Ltd. No. 99 Jinghan Avenue Qiaokou District Wuhan China Beijing institute of structure and environment engineering No.1 Donggaodi South Dahongmen Road Fengtai District Beijing China

Gaze estimation, which has a wide range of applications in many scenarios, is a challenging task due to various unconstrained conditions. As information from both full-face and eye images is instrumental in improving gaze estimation, many multiregion gaze estimation models have been proposed in recent studies. However, most of them simply use the same regression method on both eye and face images, overlooking that the eye region may contribute more fine-grained features than the full-face region, and the variation in the left and right eyes of an individual caused by head pose, illumination, and partially occluded eye may lead to inconsistent estimations. To address these issues, we propose an appearance-based end-to-end learning network architecture with an attention mechanism, named efficient gaze network (EG-Net), which employs a two-branch network for gaze estimation. Specifically, a base CNN is utilized for full-face images, while an efficient eye network (EE-Net), which is scaled up from the base CNN, is used for left- and right-eye images. EE-Net uniformly scales up the depth, width and resolution of the base CNN with a set of constant coefficients for eye feature extraction and adaptively weights the left- and right-eye images via an attention network according to its "image quality". Finally, features from the full-face image, two individual eye images and head pose vectors are fused to regress the eye gaze vectors. Through extensive experiments, the proposed EG-Net model achieves much better performance. In particular, our EG-Net-v4 model outperforms state-of-the-art approaches on the MPIIFaceGaze dataset, with prediction errors of 2.41 cm and 2.76 degrees in 2D and 3D gaze estimation, respectively. It also achieves results with an error of 1.28 cm on mobile phone-captured images and 1.71 cm on tablet-captured images from the GazeCapture dataset. © 2023, The Authors. All rights reserved.

关键词： Network architecture

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Inheritance factor on the physical properties in metallic glasses

材料展望（英文）

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材料展望（英文） 2022年第3期 185-194页

作者： Weiming Yang Jiawei Li Hongyang Li Haishun Liu Jinyong Mo Si Lan Maozhi Li Xun-Li Wang Jürgen Eckert Juntao Huo School of Mechanics and Civil Engineering State Key Laboratory for Geomechanics and Deep Underground EngineeringChina University of Mining and TechnologyXuzhou 221116People's Republic of China CAS Key Laboratory of Magnetic Materials and Devices Zhejiang Province Key Laboratory of Magnetic Materials and Application TechnologyNingbo Institute of Materials Technology and EngineeringChinese Academy of SciencesNingboZhejiang 315201People's Republic of China School of Materials and Physics China University of Mining and TechnologyXuzhou 221116People's Republic of China Herbert Gleiter Institute of Nanoscience Nanjing University of Science and Technology200 Xiaolingwei AvenueNanjing 210094People's Republic of China Department of Physics City University of Hong Kong83 Tat Chee AvenueHong KongPeople's Republic of China Department of Physics Beijing Key Laboratory of Opto-electronic Functional Materials and Micro-nano DevicesRenmin University of ChinaBeijing 100872People's Republic of China Department of Physics City University of Hong Kong83 Tat Chee AvenueHong KongPeople's Republic of China Center for Neutron Scattering City University of Hong Kong Shenzhen Research Institute8 Yuexing 1st RoadShenzhen Hi-Tech Industrial ParkShenzhen 518057People's Republic of China Erich Schmid Institute of Materials Science Austrian Academy of Science8700 LeobenAustria Department of Materials Science Chair of Materials PhysicsMontanUniversität Leoben8700 LeobenAustria

Material genetic engineering can significantly accelerate the development of new *** an important topic in material science and condensed matter physics,the development of metallic glasses(MGs)with specific properties has largely been the result of trial and error since their discovery in ***,property design based on the physical parameters of constituent elements of MGs remains a huge challenge owing to the lack of an understanding of the property inheritance from constitute elements to the resultant *** this work,we report the inherent relationships of the yield strength σy,Young's modulus E,and shear Modulus G with the valence electron *** importantly,we reveal that the electronic density of states(EDOSs)at the Fermi surface(EF)is an inheritance factor for the physical properties of *** physical properties of MGs are inherited from the specific element with the largest coefficient of electronic specific heat(γi),which dominates the value of the EDOS at *** work not only contributes to the understanding of property inheritances but also guides the design of novel MGs with specific properties based on material genetic engineering.

关键词： metallic glasses inheritance factor mechanical properties electronic density of state

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