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Balancing miscibility and crystallinity enables high-efficiency organic solar cells via ternary copolymerization

JOURNAL OF POWER SOURCES 2024年 613卷

作者： Deng, Haojie Bai, Yahui Shen, Xingxing He, Dan zhang, Yajie zhang, Jianqi Zhao, fuwen Cent South Univ Coll Chem & Chem Engn State Key Lab Powder Met Changsha 410083 Peoples R China Hebei Normal Univ Sci & Technol Coll Chem Engn Qinhuangdao 066004 Peoples R China Natl Ctr Nanosci & Technol CAS Ctr Excellence Nanosci CAS Key Lab Nanosyst & Hierarch Fabricat Beijing 100190 Peoples R China

Due to the limited exciton diffusion length and relatively low charge carrier mobilities of organic photovoltaic materials, donor/acceptor blends in organic solar cells (OSCs) have to form nanoscale interpenetrating network morphology with orderly molecular stacking to simultaneously ensure exciton diffusion to donor/acceptor interfaces and charge carrier transport to electrodes. Herein, two terpolymer donors, XD1 and XD2, are developed via inserting N-ethyl-2,2 '-bithiophene-3,3 '-dicarboximide (BTI) unit into the molecular skeleton of D18 on account of the traits of BTI. The crystallinity and miscibility of terpolymer donors increase along with the BTI ratio. The dual functions of introducing BTI make polymer:Y6 blend films exhibit the tendency of first improving then deteriorating in crystallinity, phase separation, trap density and thus charge carrier dynamics, resulting in shortcircuit current density and fill factor of OSCs to present the same trend. Among them, XD1:Y6 based OSCs well balance the dual functions of introducing BTI to acquire the optimized morphology, and thus achieve an impressive power conversion efficiency (PCE) of 19.13 %, which is among the highest values of OSCs. This work not only affords guidelines for developing high-performance terpolymer donors, but also demonstrates the importance of juggling crystallinity and miscibility of organic photovoltaic materials to boost PCEs of OSCs.

关键词： Organic solar cells Ternary copolymerization Miscibility Crystallinity Morphology

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Prolonging the exciton diffusion length by manipulating molecular stacking enables pseudo-planar heterojunction organic solar cells to achieve over 19% efficiency

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JOURNAL OF MATERIALS CHEMISTRY A 2024年第20期12卷 12208-12215页

作者： Wang, Ke Zhao, fuwen Zhu, Yufan He, Yi Liu, Zesheng Han, Xiao Ai, Qi Shen, Xingxing Li, Bao zhang, Jianqi Lin, Yuze Wang, Chunru He, Dan Cent South Univ Coll Chem & Chem Engn State Key Lab Powder Met Changsha 410083 Peoples R China Inst Chem Chinese Acad Sci Beijing Natl Lab Mol Sci CAS Key Lab Organ Solids Beijing 100190 Peoples R China Chinese Acad Sci Inst Chem Lab Mol Nanostruct & Nanotechnol Beijing 100190 Peoples R China Univ Chinese Acad Sci Coll Mat Sci & Optoelect Technol Beijing 100049 Peoples R China Univ Chinese Acad Sci Ctr Mat Sci & Optoelect Engn Beijing 100049 Peoples R China Univ Chinese Acad Sci CAS Ctr Excellence Topol Quantum Computat Beijing 100049 Peoples R China Univ Chinese Acad Sci CAS Key Lab Vacuum Phys Beijing 100049 Peoples R China Hebei Normal Univ Sci & Technol Coll Chem Engn Qinhuangdao 066004 Peoples R China Henan Normal Univ Sch Chem & Chem Engn Xinxiang 453007 Peoples R China CAS Ctr Excellence Nanosci Natl Ctr Nanosci & Technol CAS Key Lab Nanosyst & Hierarch Fabricat Beijing 100190 Peoples R China

The limited exciton diffusion length (LD) of organic semiconductors constraints exciton dissociation in pseudo-planar heterojunction (PPHJ) organic solar cells (OSCs), which is deemed the bottleneck hampering the further improvement in their power conversion efficiencies (PCEs). Herein, a solid-additive strategy was proposed to efficiently prolong the LD in PPHJ OSCs by developing a volatile solid additive, SA-5F, and blending it in non-fullerene acceptors. The addition of SA-5F endowed a Y6+ film with improved crystallinity and more compact molecular stacking, resulting in a higher photoluminescence quantum yield, larger overlap between its absorption and emission spectra, and shorter intermolecular distance compared with a pristine Y6 film. Thus, the Y6+ film achieved a higher exciton diffusion coefficient of 1.36 x 10-3 cm2 s-1 and, thus, similar to 24% improvement in the LD to 10.27 nm. The prolonged LD enabled D18/Y6+-based PPHJ devices to realize more efficient exciton dissociation and weaker charge recombination compared with their D18/Y6 counterparts. Therefore, D18/Y6+-based PPHJ OSCs afforded an impressive PCE of 19.11%, which is among the highest values reported to date. Moreover, this strategy exhibits excellent universality in improving the photovoltaic performance of different systems. Thus, it was demonstrated that introducing a solid additive is an efficient and universal strategy to prolong the LD in PPHJ OSCs and consequently boost their PCEs. A solid additive, SA-5F, is employed to promote molecular stacking, which leads to higher crystallinity, boosting the exciton diffusion coefficient and then exciton diffusion length. Thus, D18/Y6+-based PPHJ OSCs afford an impressive PCE of 19.11%.

关键词： Organic solar cells

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设置碟形弹簧的框架-摇摆墙结构抗震性能试验研究

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建筑结构学报 2019年第8期40卷 61-70页

作者：蒋璐李向民张富文董金芝蒋利学许清风上海市建筑科学研究院上海市工程结构安全重点实验室

受控摇摆墙通常采用预应力筋的形式实现,预应力筋基础锚固施工困难,墙体摇摆幅度很小且易与基础发生碰撞.为解决上述问题,研发了一种受控摇摆墙,主要通过基于碟形弹簧的装置实现墙体的受控约束,墙体与主体框架、基础分别采用耗能连接件... 详细信息

受控摇摆墙通常采用预应力筋的形式实现,预应力筋基础锚固施工困难,墙体摇摆幅度很小且易与基础发生碰撞.为解决上述问题,研发了一种受控摇摆墙,主要通过基于碟形弹簧的装置实现墙体的受控约束,墙体与主体框架、基础分别采用耗能连接件和V形支撑连接.设计制作了缩尺比为1∶2的对比框架与框架-摇摆墙试件,通过低周往复加载试验研究其抗震性能、破坏模式和自复位特性.结果表明,设置碟形弹簧的框架-摇摆墙较对比框架承载力提高了107.1%,且具有更好的刚度退化性能与耗能性能,框架结构的变形模式得到改善,使得各层的层间位移趋于均匀.连接件是影响框架-摇摆墙结构耗能及协调层间变形的关键,应进一步研究其改进措施及优化设计.

关键词：框架-摇摆墙碟形弹簧延性连接件拟静力试验变形模式耗能能力

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加味桃核承气汤治疗非酒精性脂肪肝痰阻血瘀证临床观察

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中国中医药现代远程教育 2021年第9期19卷 112-113,119页

作者：田同儒张福文李柏王凤磊李静杨新立贺永强北京中医药大学东直门医院通州院区脾胃病科北京101100

目的观察加味桃核承气汤治疗非酒精性脂肪肝痰阻血瘀证临床疗效。方法将北京中医药大学东直门医院通州院区93例非酒精性脂肪肝痰阻血瘀证患者随机分为治疗组(49例)和对照组(44例),治疗组应用中药加味桃核承气汤治疗,对照组口服水飞蓟宾... 详细信息

目的观察加味桃核承气汤治疗非酒精性脂肪肝痰阻血瘀证临床疗效。方法将北京中医药大学东直门医院通州院区93例非酒精性脂肪肝痰阻血瘀证患者随机分为治疗组(49例)和对照组(44例),治疗组应用中药加味桃核承气汤治疗,对照组口服水飞蓟宾胶囊治疗。观察2组患者治疗前后症状分级、实验室指标及腹部B超的变化,比较2组患者的中医证候疗效和B超疗效。结果治疗组的中医证候疗效高于对照组,差异有统计学意义(P<0.05);2组治疗后的丙氨酸氨基转移酶(Alanine aminotransferase,ALT)、总胆固醇(Total cholesterol,TC)、三酰甘油(Triglycerides,TG)水平较治疗前降低,高密度脂蛋白胆固醇(High density lipoprotein cholesterol,HDL-C)较治疗前升高,差异有统计学意义(P<0.05);治疗组的B超疗效高于对照组,差异有统计学意义(P<0.05)。结论加味桃核承气汤可明显改善非酒精性脂肪肝痰阻血瘀证患者的中医临床症状、实验室指标和肝脏B超声像图,提高非酒精性脂肪肝痰阻血瘀证的临床疗效。

关键词：桃核承气汤胁痛非酒精性脂肪肝肝痞

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Random projection enhancement: A Novel method for improving performance of surrogate models

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SWARM AND EVOLUTIONARY COMPUTATION 2024年 89卷

作者： zhang, Shuai Pang, Yong Liu, fuwen Wang, Muchen Kan, Ziyun Song, Xueguan Dalian Univ Technol Sch Mech Engn Dalian 116024 Peoples R China Dalian Univ Technol State Key Lab High performance Precis Mfg Dalian 116024 Peoples R China

Surrogate models serve as powerful tools for engineering application but constructing highly accurate models with limited samples remains a challenge. Inspired by this, this paper proposes a general random projection enhancement method (RPE) aimed at improving surrogate model performance. Taking least squares support vector regression (LSSVR) as an example, we conducted numerical experiments to evaluate the feasibility of the RPE method. The RPE-enhanced LSSVR demonstrates superior predictive accuracy and robustness compared to the unenhanced model and other benchmark models. The results show that the RPE method can not only enhance the predictive accuracy of the model but also improve the robustness of the model. Meanwhile, analysis of optimization experiments indicated that the enhanced LSSVR model obtained better solutions compared to the unenhanced LSSVR model. Even when extended to high -dimensional problems, the RPE method remains effective. Furthermore, the applicability of RPE method extends from the LSSVR model to other models, as demonstrated by the enhancement of the extreme learning machine, regression kriging, and radial basis function neural network. More importantly, the feasibility of the RPE method is also verified in engineering problems, obtaining the same results. This method offers a reliable alternative for real -world engineering optimization problems.

关键词： Surrogate model Random projection Model performance enhancement Update strategy

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Browse and Concentrate: Comprehending Multimodal Content via prior-LLM Context Fusion 62

Browse and Concentrate: Comprehending Multimodal Content via...

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62nd Annual Meeting of the Association-for-Computational-Linguistics (ACL) / Student Research Workshop (SRW)

作者： Wan, Ziyue Chen, Chi Zhu, Yiqi Luo, fuwen Li, Peng Yan, Ming zhang, Ji Huang, Fei Sun, Maosong Liu, Yang Tsinghua Univ Inst AI Dept Comp Sci & Tech Beijing Peoples R China Tsinghua Univ Inst AI Ind Res AIR Beijing Peoples R China Alibaba Grp Inst Intelligent Comp Hangzhou Peoples R China Shanghai Artificial Intelligence Lab Shanghai Peoples R China Jiangsu Collaborat Innovat Ctr Language Competenc Nanjing Jiangsu Peoples R China

ISBN: (纸本)9798891760943

With the bloom of Large Language Models (LLMs), Multimodal Large Language Models (MLLMs) that incorporate LLMs with pretrained vision models have recently demonstrated impressive performance across diverse vision-language tasks. However, they fall short to comprehend context involving multiple images. A primary reason for this shortcoming is that the visual features for each images are encoded individually by frozen encoders before feeding into the LLM backbone, lacking awareness of other images and the multimodal instructions. We term this issue as prior-LLM modality isolation and propose a two phase paradigm, browse-and-concentrate1, to enable in-depth multimodal context fusion prior to feeding the features into LLMs. This paradigm initially "browses" through the inputs for essential insights, and then revisits the inputs to "concentrate" on crucial details, guided by these insights, to achieve a more comprehensive understanding of the multimodal inputs. Additionally, we develop training strategies specifically to enhance the understanding of multi-image inputs. Our method markedly boosts the performance on 7 multi-image scenarios, contributing to increments on average accuracy by 2.13% and 7.60% against strong MLLMs baselines with 3B and 11B LLMs, respectively.

关键词： Computational linguistics

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Need of a paradigm shift to conserve endangered species in China’s national park system

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The Innovation 2023年第4期4卷 23-24页

作者： Biao Yang Qiang Dai Yu Xu Christina D.Buesching Xiaodong Gu Zhisong Yang Zejun zhang fuwen Wei Key Laboratory of Southwest China Wildlife Resources Conservation(Ministry of Education) China West Normal UniversityNanchong 637002China College of Forestry Jiangxi Agricultural UniversityNanchang 330045China CAS Key Laboratory of Animal Ecology and Conservation Biology Institute of ZoologyChinese Academy of SciencesBeijing 100101China Chengdu Institute of Biology Chinese Academy of SciencesChengdu 610041China School of Life Sciences Guizhou Normal UniversityGuiyang 550001China Department of Biology The University of British ColumbiaKelownaBC V1V1V7Canada Giant Panda National Park Administration Chengdu 610081China Sichuan Academy of Giant Panda Chengdu 610081China

CHINAS EVOLVING NATIONAL PARK DESIGNATIONS AND SINGLE LARGE PROTECTED AREA OR SEVERAL SMALL PROTECTED AREAS(SLOSS)DEBATE As of 2021,the International Union for Conservation of Nature estimated that there are over 6,000 national parks(NPs)in more than 100 countries,most of which are strongly focused on endangered species.1 Over the past 6 years,China has invested US$20million in developing the Giant Panda National Park(GPNP)and a furtherUS$16million in establishing theNortheast China Tiger and Leopard National Park(NCTLNP).

关键词： invested PARK Northeast

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Advanced design and development of catalysts in propane dehydrogenation

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NANOSCALE 2022年第28期14卷 9963-9988页

作者： Yang, fuwen zhang, Jie Shi, Zongbo Chen, Jinwei Wang, Gang He, Junjie Zhao, Junyu Zhuo, Runsheng Wang, Ruilin Sichuan Univ Coll Mat Sci & Engn Chengdu 610065 Peoples R China REZEL Catalysts Corp Shanghai 200120 Peoples R China Sichuan Univ Engn Res Ctr Alternat Energy Mat & Devices Minist Educ Chengdu 610065 Peoples R China

Propane dehydrogenation (PDH) is an industrial technology for direct propylene production, which has received extensive attention and realized large-scale application. At present, the commercial Pt/Cr-based catalysts suffer from fast deactivation and inferior stability resulting from active species sintering and coke depositing. To overcome the above problems, several strategies such as the modification of the support and the introduction of additives have been proposed to strengthen the catalytic performance and prolong the robust stability of Pt/Cr-based catalysts. This review firstly gives a brief description of the development of PDH and PDH catalysts. Then, the advanced research progress of supported noble metals and non-noble metals together with metal-free materials for PDH is systematically summarized along with the material design and active origin as well as the existing problems in the development of PDH catalysts. Furthermore, the review also emphasizes advanced synthetic strategies based on novel design of PDH catalysts with improved dehydrogenation activity and stability. Finally, the future challenges and directions of PDH catalysts are provided for the development of their further industrial application.

关键词： Precious metals

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Laboratory simulation on airborne chloride transport behaviors in cracked mortar under drying-wetting conditions

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JOURNAL OF BUILDING ENGINEERING 2024年 89卷

作者： Yuan, Qiang Zhong, fuwen zhang, Kai zhang, Jiajia Chen, Guoshun Chen, Qiqiang zhang, Zhipeng Tang, Qinghua Tian, Yi Cent South Univ Sch Civil Engn Changsha 410075 Hunan Peoples R China Natl Engn Res Ctr High speed Railway Construction Changsha 410075 Hunan Peoples R China Shandong CSCEC Urban Dev Ltd Co Jinan 250014 Shandong Peoples R China Southeast Coastal Railway Fujian Co Ltd Fuzhou 350011 Fujian Peoples R China

Airborne chloride deteriorates the durability of reinforced concrete structures, with cracks accelerating this decay process. The salt spray chamber (SSC) has been employed to simulate chloride transport in cementitious materials but falls short of quantitatively correlating the laboratory and field results. This study investigated airborne chloride penetration in cracked mortar under simulated drying-wetting alternation using the SSC. Results revealed that the cracks transform chloride transport from one-dimensional to two-dimensional, resulting in higher surface chloride concentrations and diffusion coefficients. This study linked the laboratory and field airborne chloride transports by establishing a logarithmic equation correlating surface chloride concentration with chloride deposition rate. An empirical equation incorporating cumulative chloride deposition and crack widths is proposed. The simulated initial corrosion time of mortar and mortar with 30 % fly ash is 15.5 a and 19.64 a, respectively. However, this time shortens to 2.75 a and 6.19 a when the crack width extends to 0.4 mm. This study offers new insights into understanding airborne chloride transport in cracked mortar and the connection between laboratory simulation and field results.

关键词： Atmospheric zone Concrete durability Chloride transport Drying -wetting cycle Cracks

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Event-Triggered Sliding Mode Control of Switched Neural Networks With Mode-Dependent Average Dwell Time

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IEEE TRANSACTIONS ON SYSTEMS MAN CYBERNETICS-SYSTEMS 2021年第2期51卷 1233-1243页

作者： Yan, Huaicheng zhang, Hao Zhan, Xisheng Wang, Yueying Chen, Shiming Yang, fuwen East China Jiaotong Univ Sch Elect & Automat Engn Nanchang 330013 Jiangxi Peoples R China East China Univ Sci & Technol Minist Educ Key Lab Adv Control & Optimizat Chem Proc Shanghai 200237 Peoples R China East China Univ Sci & Technol Sch Informat Sci & Engn Shanghai 200237 Peoples R China Hubei Normal Univ Dept Control Sci & Engn Huangshi 435002 Hubei Peoples R China Shanghai Univ Sch Mechatron & Automat Shanghai 200444 Peoples R China Griffith Univ Sch Engn Gold Coast Qld 4222 Australia

This paper is concerned with the sliding mode control problem for a class of continuous-time switched neural networks with mode-dependent average dwell time (MDADT). The considered continuous-time switched neural networks are motivated by biological neural networks which contain a nonlinear term and a changeable switched signal. The concept of MDADT is introduced, in which every subsystem has its own dwell time before switching to another subsystem. Moreover, a novel sliding mode controller is designed by an event-triggered mechanism which is based on the observer error and the system mode, where its triggered condition can be more conservative and practical than the existing triggered conditions. Sufficient conditions are derived to ensure that the closed-loop system is stochastically exponentially stable in terms of linear matrix inequalities. The designed sliding mode controller can promote the sliding mode motion of the system state. Finally, an illustrative example is provided to demonstrate the effectiveness and merits of the proposed method.

关键词： Event-triggered mechanism mode-dependent average dwell time (MDADT) sliding mode control switched neural networks

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