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An A-D-A′-D-A type unfused nonfullerene acceptor for organic solar cells with approaching 14%efficiency

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Science China Chemistry 2021年第2期64卷 228-231页

作者： xingzheng liu Yanan Wei Xin Zhang Linqing Qin Zhixiang Wei Hui Huang College of Materials Science and Opto-Electronic Technology Center of Materials Science and Optoelectronics EngineeringCAS Center for Excellence in Topological Quantum ComputationCAS Key Laboratory of Vacuum PhysicUniversity of Chinese Academy of SciencesBeijing 100049China CAS Key Laboratory of Nanosystem and Hierarchical Fabrication CAS Center for Excellence in NanoscienceNational Center for Nanoscience and TechnologyBeijing 100190China

In recent years,power conversion efficiency(PCE)of organic solar cells(OSCs)has made significant improvement.A large number of studies were reported to achieve high PCEs through exploring new active layer materials,especially the high efficiency fused ring acceptors(FRAs).Compared with FRAs,another type of so-called unfused-ring acceptors(UFAs),possessing some advantages such as simple synthesis and low cost,have attracted a lot of ***,a new UFA BTzO-4F,incorporating with a benzotriazole moiety and S···O intramolecular noncovalent interactions,has been successfully *** photovoltaic device based on PBDB-T:BTzO-4F achieved a record PCE of 13.8%for UFAs,which indicates that introducing the benzotriazole moiety is an effective strategy for high quality ***,these findings of this work demonstrate the great potential of UFAs for high performance OSCs.

关键词： organic solar cells unfused nonfullerene acceptor benzotriazole moiety

High-gravity technology intensified Knoevenagel condensation-Michael addition polymerization of poly (ethylene glycol)-poly (n-butyl cyanoacrylate) for blood-brain barrier delivery

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Chinese Journal of Chemical Engineering 2022年第6期35卷 94-103页

作者： xingzheng liu Chuanbo Fu Manting Wang Jiexin Wang Haikui Zou Yuan Le Jianfeng Chen State Key Laboratory of Organic-Inorganic Composites Beijing University of Chemical TechnologyBeijing 100029China Research Centre of the Ministry of Education for High Gravity Engineering and Technology Beijing University of Chemical TechnologyBeijing 100029China

Poly(ethylene glycol)-poly(n-butyl cyanoacrylate)(PEG-PBCA)is a remarkable drug delivery carrier for permeating blood-brain *** this work,a novel high-gravity procedure was reported to intensify Knoevenagel condensation-Michael addition polymerization of PEG-PBCA.A series of PEG-PBCA containing different block ratios were synthesized with narrow molecular weight distribution of polydispersity indexes less than ***,the reaction time reduced 60%compared to conventional stirred tank reactor *** structures of as-prepared polymers were *** vitro drug delivery performance was *** cytotoxicity of PEG-PBCA to brain microvessel endothelial cells(BMVEC)decreases with the extension of the PEG chain and the shortening of the PBCA *** polymer cellular uptake to BMVECs was better after improving hydrophilicity by PEG *** of bloodbrain barrier permeability demonstrated that medium length of PBCA chain and short PEG chain are favorable for hydrophobic Nile red permeation,while long PEG chain and short PBCA chain are beneficial to delivery water-soluble doxorubicin hydrochloride(Dox).The average apparent permeability coeffi-cient increased 1.7 and 0.25 times than that of raw Nile red and Dox,***-gravity intensi-fied condensation polymerization should have great potential in brain drug delivery system.

关键词： High-gravity technology Knoevenagel condensation-Michael addition polymerization Poly(ethylene glycol)-poly(n-butyl cyanoacrylate) Blood-brain barrier Polymerization Reactors

Low-cost polymer acceptors with noncovalently fused-ring backbones for efficient all-polymer solar cells

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Science China Chemistry 2022年第5期65卷 926-933页

作者： Xiaobin Gu Yanan Wei xingzheng liu Na Yu Laiyang Li Ziyang Han Jinhua Gao Congqi Li Zhixiang Wei Zheng Tang Xin Zhang Hui Huang College of Materials Science and Opto-Electronic Technology Center of Materials Science and Optoelectronics EngineeringCAS Center for Excellence in Topological Quantum ComputationCAS Key Laboratory of Vacuum PhysicsUniversity of Chinese Academy of SciencesBeijing 100049China Center for Advanced Low-dimension Materials State Key Laboratory for Modification of Chemical Fibers and Polymer MaterialsCollege of Materials Science and EngineeringDonghua UniversityShanghai 201620China CAS Key Laboratory of Nanosystem and Hierarchical Fabrication CAS Center for Excellence in NanoscienceNational Center for Nanoscience and TechnologyBeijing 100190China

The polymerization of fused-ring acceptors(FRAs) to afford their corresponding polymeric acceptors for high-performance all-polymer solar cells(all-PSCs) has achieved remarkable progress in the past few ***,due to the high degree of synthetic complexity for the monomer,the high-cost of these polymeric acceptors may limit their commercial ***,it is urgent to develop inexpensive and high-performance polymeric acceptors for ***,two novel polymeric acceptors(PBTzO and PBTzO-2F) have been designed and synthesized by copolymerization of noncovalently fused ring acceptors(NFRAs),which were employed in all-PSCs for the first *** introducing the “noncovalently conformational locks(NoCLs)” in the backbone and selective fluorination of the end-group,photophysical and electrical properties,and solidstate packing properties of the NFRAs have been rationally *** a result,the PBDB-T:PBTzO-2F based devices presented an excellent power conversion efficiency(PCE) of 11.04%,much higher than that of PBTzO based ones due to the increased charge generation and extraction,improved hole transfer and carrier mobilities,and reduced energy *** importantly,PBTzO-2F exhibited a much lower synthetic complexity(SC) index and higher figure-of-merit(FOM) values than the high-performance fused-ring acceptor based polymer acceptors(FRA-PAs) due to the simpler structures and more effective *** contribution provided a novel idea to achieve low-cost and high-performance all-PSCs.

关键词： all-polymer solar cells low-cost polymer acceptors noncovalently fused-ring backbones figure-of-merit values

加味真武汤联合西药治疗腹膜透析合并慢性心力衰竭临床研究

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新中医 2024年第16期56卷 1-5页

作者：彭玲孙致健刘兴正杨雪瑞莫锦莹宋高峰广州中医药大学第四临床医学院广东深圳518033 深圳市中医院广东深圳518033

目的:观察加味真武汤联合西药治疗腹膜透析(PD)合并慢性心力衰竭(CHF)阳虚水泛证的临床疗效。方法:选取54例PD合并CHF阳虚水泛证患者,采用随机数字表法分为对照组与观察组各27例。研究过程中对照组剔除2例、观察组剔除3例,最终纳入研究... 详细信息

目的:观察加味真武汤联合西药治疗腹膜透析(PD)合并慢性心力衰竭(CHF)阳虚水泛证的临床疗效。方法:选取54例PD合并CHF阳虚水泛证患者,采用随机数字表法分为对照组与观察组各27例。研究过程中对照组剔除2例、观察组剔除3例,最终纳入研究对照组25例、观察组24例。对照组给予常规西药治疗,观察组在对照组基础上给予加味真武汤治疗,2组均治疗24周。比较2组临床疗效、中医证候积分及心功能指标[脑钠肽(BNP)、半乳糖凝集素-3 (Galectin-3)]水平。结果:治疗24周后,观察组总有效率79.17%,高于对照组28.00%,差异有统计学意义(P0.05)。观察组血清BNP、Galectin-3水平均较治疗前降低,且均低于对照组,差异均有统计学意义(P0.05)。结论:加味真武汤联合西药治疗PD合并CHF阳虚水泛证临床疗效较好,可有效改善临床症状,降低血清BNP、Galectin-3水平。

关键词：慢性心力衰竭腹膜透析阳虚水泛证加味真武汤半乳糖凝集素-3 脑钠肽

Frequency Regulation of VSC-MTDC System with Offshore Wind Farms

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Journal of Modern Power Systems and Clean Energy 2024年第1期12卷 275-286页

作者： Haoyu liu Chongru liu North China Electric Power University Beijing 102206China

Frequency regulation of voltage source converter-based multi-terminal high-voltage direct current(VSC-MTDC)system with offshore wind farms enhances the frequency stability by compensating the power for a disturbed AC ***,it is difficult to reasonably allocate frequency-regulation resources due to a lack of coordination mechanisms between wind farms and the MTDC ***,it is difficult for the frequency control of the wind farms to manage changes in wind speed;and the risk of wind-turbine stalls is ***,based on the kinetic energy of wind turbines and the power margin of the converters,the frequency-regulation capability of wind turbines is evaluated,and a dynamic frequency-support scheme considering the real-time frequency-support capability of the wind turbines and system frequency evolution is proposed to improve the frequency-support performance.A power adaptation technique at variable wind speeds is developed;the active power in the frequency-support stage and restoration stage is switched according to the wind speed.A hierarchical zoning frequency-regulation scheme is designed to use the frequency-regulation resources of different links in the MTDC system with wind *** simulation results show that the novel frequency-regulation strategy maintains frequency stability with wind-speed changes and avoids multiple frequency dips.

关键词： Wind generation voltage source converter-based multi-terminal high-voltage direct current(VSC-MTDC) frequency regulation cooperative control adaptive control variable wind speed

滋阴固土汤联合西药治疗阴虚阳亢型原发性高血压病的临床观察

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中国中医药现代远程教育 2022年第19期20卷 147-149页

作者：康彩霞刘兴政吉安市中心人民医院中医科江西吉安343000 吉安市中心人民医院全科医学江西吉安343000

目的探讨滋阴固土汤配合西药治疗阴虚阳亢型原发性高血压病的效果。方法选择吉安市中心人民医院2019年12月—2020年12月治疗的55例患者作为研究对象。按照随机数字表法对照法分为对照组(27例)和观察组(28例)。对照组采用苯磺酸氨氯地平... 详细信息

目的探讨滋阴固土汤配合西药治疗阴虚阳亢型原发性高血压病的效果。方法选择吉安市中心人民医院2019年12月—2020年12月治疗的55例患者作为研究对象。按照随机数字表法对照法分为对照组(27例)和观察组(28例)。对照组采用苯磺酸氨氯地平片治疗。观察组在对照组的基础上联合使用滋阴固土汤治疗。比较2组临床疗效、中医证候积分、血流动力学指标、不良反应。结果观察组总有效率为92.86%(26/28),高于对照组66.67%(18/27),差异有统计学意义(P<0.05);观察组干预后中医证候积分(眩晕头痛、腰膝酸软、失眠健忘)低于干预前以及对照组,差异有统计学意义(P<0.05);观察组干预后血流动力学水平(全血高切黏度、全血低切黏度、血浆黏度水平)低于干预前以及对照组,差异有统计学意义(P<0.05);患者均为发生明显不良反应。结论对于阴虚阳亢型原发性高血压病的患者,采用滋阴固土汤配合西药治疗,可以较好地改善患者的临床症状,降低中医证候积分,恢复血流动力学水平,且不会增加患者的不良反应。

关键词：滋阴固土汤眩晕阴虚阳亢证原发性高血压病

A Novel Design of a Pre-separation Panel Structure to Protect Against the Impact of an Explosion in an Aircraft Plenum Chamber

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Acta Mechanica Solida Sinica 2024年第1期37卷 166-180页

作者： Zongxing liu Xiang Yang Jun liu School of Aeronautics Northwestern Polytechnical UniversityXi'an 710072China COMAC Shanghai Aircraft Design and Research Institute Shanghai 201210China

To reduce the damage of the pressurizing panel structure of a fuselage caused by an explosion at the“least risk bomb location”in an aircraft structure,a new pre-separation panel structure was designed to resist blast ***,the dynamic strain response and morphology of impact damage of the new pre-separation panel were measured in an impact damage ***,the commercial software LS-DYNA was used to calculate the propagation of the blast shock wave,and the results were compared with empirical equations to verify the rationality of the numerical calculation ***,the fluid–structure coupling method was used to calculate the damage process of the pre-separation panel structure under the impact of an explosion wave and an impact *** calculated results were in good agreement with the test results,which showed the rationality of the calculation method and the *** residual strength of the damaged pre-separation panel was significantly higher than that of the original damaged *** results show that the new pre-separation panel structure is reasonable and has certain significance for guiding the design of plenum chambers with strong resistance to implosion for aircraft fuselages.

关键词： Pre-separation panel structure Explosive response Residual strength Aircraft plenum chamber Least risk bomb location

Stochastic Unit Commitment with High-Penetration Offshore Wind Power Generation in Typhoon Scenarios

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Journal of Modern Power Systems and Clean Energy 2024年第2期12卷 535-546页

作者： Yanqi liu Dundun liu Hongcai Zhang State Key Laboratory of Internet of Things for Smart City and Department of Electrical and Computer Engineering University of MacaoMacao 999078China University of Macao Zhuhai UM Science and Technology Research Institute ZhuhaiChina

To tackle the energy crisis and climate change,wind farms are being heavily invested in across the *** China's coastal areas,there are abundant wind resources and numerous offshore wind farms are being *** secure operation of these wind farms may suffer from typhoons,and researchers have studied power system operation and resilience enhancement in typhoon ***,the intricate movement of a typhoon makes it challenging to evaluate its spatial-temporal *** published papers only consider predefined typhoon trajectories neglecting *** address this challenge,this study proposes a stochastic unit commitment model that incorporates high-penetration offshore wind power generation in typhoon *** adopts a data-driven method to describe the uncertainties of typhoon trajectories and considers the realistic anti-typhoon mode in offshore wind farms.A two-stage stochastic unit commitment model is designed to enhance power system resilience in typhoon *** formulate the model into a mixed-integer linear programming problem and then solve it based on the computationally-efficient progressive hedging algorithm(PHA).Finally,numerical experiments validate the effectiveness of the proposed method.

关键词： Unit commitment two-stage stochastic programming offshore wind farm typhoon

Effectiveness and safety of acupuncture in treatment of pregnancyrelated symptoms:a systematic review and Meta-analysis

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Journal of Traditional Chinese Medicine 2024年第1期44卷 16-26页

作者： liu Tingting liu Tongou liu Mingfu School of Traditional Chinese Medicine Clinical Medicine Hubei University of Traditional Chinese MedicineWuhan 430000China First Clinical College of Hubei University of Traditional Chinese Medicine Wuhan 430000China Department of Acupuncture and Tuina Affiliated Hospital of Hubei University of Traditional Chinese MedicineHubei Provincial Hospital of Traditional Chinese MedicineWuhan 430000China

OBJECTIVE:To systematically evaluate the efficacy and safety of acupuncture(AM)in the treatment of pregnancyrelated symptoms such as acute vomiting during ***:We comprehensively searched the available literature up to November 2021,including Pub Med,Embase,Cochrane Library,Chinese Biomedical Literature Database,and China National Knowledge Infrastructure Database,for randomized controlled trials(RCTs)on AM for the treatment of severe vomiting,insomnia,pharyngeal and pelvic pain,mood abnormalities,and dyspepsia during ***:Sixteen RCTs with a cumulative sample size of 1178 cases were *** these,964 patients were included in the *** Meta-analysis results showed that AM was more efficient than Western medicine in treating discomfort during pregnancy[odds ratio(OR)=1.19,95%confidence interval(CI)(1.11,1.28),P<0.01].AM was better than the control group in improving the visual analog scale scores[standard mean difference(SMD)=0.62,95%CI(0.53,0.71),P<0.01].AM was superior to the control group in improving Numerical Rating Scale(NRS)symptom scores[OR=7.31,95%CI(3.36,15.94),P<0.01].There was no significant difference in adverse effects between the AM and sham-AM groups and the analgesic drug group[OR=0.70,95%CI(0.39,1.28),P=0.25],but the treatment and control groups had mild adverse effects with a low ***:AM is more effective than other treatments or pharmacotherapy alone in the treatment of pregnancy-related symptoms,and is relatively ***,the quality of the included trials was rather poor,and high-quality studies are required to confirm our findings.

关键词： acupuncture pregnancy nausea vomiting sleep initiation and maintenance disorders low back pain pelvic pain mood abnormalities Meta-analysis systematic review