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Chemical Research in Chinese Universities 2023年第2期39卷 213-218页

作者： ZHANG Ziwei XIA Dongdong XIE Qian ZHAO Chaowei FANG Jie WU Yonggang li weiwei College of Chemistry and Environmental Science Hebei UniversityBaoding071002P.R.China Institute of Applied Chemistry Jiangxi Academy of SciencesNanchang330096P.R.China Beijing Advanced Innovation Center for Soft Matter Science and Engineering and State Key Laboratory of Organic-Inorganic Composites Beijing University of Chemical TechnologyBeijing100029P.R.China

By combining stable radical tetramethylpiperidine nitrogen oxide(TEMPO)as end groups and perylene bisimide(PBI)as the core,a small molecular cathode interlayer(CIL)(PBI-TEMPO)was *** physical-chemical characterizations indicate that PBI-TEMPO can form smooth film,owns low unoccupied molecular orbital(LUMO)level of−3.67 eV and can reduce the work function of silver *** using PBI-TEMPO as CIL in non-fullerene organic solar cells(OSCs),the PM6:BTP-4Cl based OSCs delivered high power conversion efficiencies(PCEs)up to 17.37%,higher than those using commercial PDINO CIL with PCEs of 16.95%.Further device characterizations indicate that PBI-TEMPO can facilitate more efficient exciton dissociation and reduce charge recombination,resulting in enhanced current density and fill ***,PBI-TEMPO displays higher thermal stability than PDINO in *** PBI-TEMPO and PDINO solution were heated at 150℃ for 2 h and then were used as CIL in solar cells,PBI-TEMPO-based OSCs provided a PCE of 15%,while PDINO-based OSCs only showed a PCE of 10%.These results demonstrate that incorporating TEMPO into conjugated materials is a useful strategy to create new organic semiconductors for application in OSCs.

关键词： Tetramethylpiperidine nitrogen oxide(TEMPO) Perylene bisimide Cathode interlayer Organic solar cell Power conversion efficiency

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地下工程咬合型管幕构件抗弯承载力研究

建筑结构 2024年第6期54卷 38-45,17页

作者：李伟伟董驾潮金文强赵文刘玉平关永平广州地铁设计研究院股份有限公司广州510010 东北大学资源与土木工程学院沈阳110819 沈阳建筑大学交通工程学院沈阳110168

基于咬合型管幕试件的抗弯性能试验,研究了咬合型管幕试件的力学性能及破坏形态。为进一步研究关键结构参数对咬合型管幕试件抗弯性能的影响,运用ABAQUS建立了咬合型管幕试件的有限元模型,并通过室内试验验证了模型的正确性;进而分析了... 详细信息

基于咬合型管幕试件的抗弯性能试验,研究了咬合型管幕试件的力学性能及破坏形态。为进一步研究关键结构参数对咬合型管幕试件抗弯性能的影响,运用ABAQUS建立了咬合型管幕试件的有限元模型,并通过室内试验验证了模型的正确性;进而分析了钢管咬合程度、钢管壁厚及钢筋直径对咬合型管幕试件抗弯性能的影响。结果表明:咬合型管幕试件抗弯性能良好,试件最终发生延性破坏;钢管咬合程度、钢管壁厚对试件的抗弯承载力影响显著,钢筋直径对试件的抗弯承载力影响不明显。最后,给出了钢管咬合程度、钢管壁厚及钢筋直径与抗弯承载力的关系式;并通过多元线性回归得到了咬合型管幕试件抗弯承载力简化计算公式。

关键词：地下结构咬合型管幕抗弯承载力破坏模式回归分析

Low N apparent surplus with higher rice yield under long-term fertilizer postponing in the rice-wheat cropping system

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The Crop Journal 2022年第4期10卷 1178-1186页

作者： Yan Zhou Lei Xu Jianwei Zhang weiwei li Yu Jiang Songhan Wang Yanfeng Ding Zhenghui liu Ganghua li National Engineering and Technology Center for Information Agriculture/Key Laboratory of Crop Physiology and Ecology in Southern China/Jiangsu Collaborative Innovation Center for Modern Crop Production Nanjing Agricultural UniversityNanjing 210095JiangsuChina Scientific Observing and Experimental Station of Arable Land Ministry of Agriculture and Rural AffairsChina/Institute of Agricultural Resources and EnvironmentJiangsu Academy of Agricultural SciencesNanjing 210095JiangsuChina

Nitrogen(N)fertilization increases rice yield,but inappropriate N fertilizer application increases N loss and the risk of environmental ***-term fertilizer postponing(FP)generally reduces N apparent surplus and increases rice yields,but the effects of long-term FP on N surplus and rice yields remain *** study was the first to investigate the impacts of long-term FP(11 years)on N apparent surplus and rice *** effects in the short term(≤6 years)did not affect rice yields,whereas FP effects in the long term(>6 years)increased rice yields by 13.9%compared with conventional fertilization(CF).FP did not affect panicles per unit area,1000-kernel weight,and filled-kernel rate,but spikelets per panicle increased over time due to spikelet formation *** also reduced the N apparent surplus over time more strongly than CF owing to higher N accumulation and N utilization *** effects in the long term also significantly increased soil organic matter,total N,and NH4_(+)^(-)N *** results were supported by a pot experiment,showing that rice yields in soils with a history of FP were significantly higher than those for soils without a history of FP,indicating that FP increased rice yields more strongly in later years mainly because of soil quality *** findings suggest that longterm FP can reduce N loss while increasing rice yields by improving soil quality.

关键词： Fertilizer postponing N apparent surplus Rice yield Spikelets per panicle Rice-wheat cropping systems

The first application of isoindigo-based polymers in non-fullerene organic solar cells

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Science China Chemistry 2020年第9期63卷 1262-1271页

作者： Bao Zhang Ning An Hongbo Wu Yanfang Geng Yanming Sun Zaifei Ma weiwei li Qiang Guo Erjun Zhou Henan Institutes of Advanced Technology Zhengzhou UniversityZhengzhou 450003China CAS Key Laboratory of Nanosystem and Hierarchical Fabrication CAS Center for Excellence in NanoscienceNational Center for Nanoscience and TechnologyBeijing 100190China School of Chemistry Beihang UniversityBeijing 100191China Center for Advanced Low-dimension Materials College of Materials Science and EngineeringDonghua UniversityShanghai 201620China State Key Laboratory of Organic-Inorganic Composites Beijing University of Chemical TechnologyBeijing 100029China

Although isoindigo(IID)-based polymers can realize high charge mobility,these materials are currently confined to fullerenebased organic solar cells(OSCs).Herein,we designed a pair of alternative D-π-A type copolymers,PE71 and PE72,to expand the application in non-fullerene OSCs,where benzo[1,2-b:4,5-b′]thiophene(BDT),thieno[3,2-b]thiophene(TT)and IID units were used as D,A andπ-bridge,*** aim of optimizing the length of alkyl chains on TT bridge is to ensure polymer solubility,crystallinity as well as miscibility with acceptor *** find that PE71 and PE72 exhibit similar optical and electronic properties,but PE71 with shorter hexyl chain tends to aggregate into fiber-like *** the end,Y6 is selected as the electron acceptor because of suitable energy levels and complementary absorption ***,PE71:Y6 device realizes a power conversion efficiency(PCE)of 12.03%,which is obviously higher than that of PE72:Y6 device(9.74%)and is also the highest value for IID-based photovoltaic *** charge transport,molecular aggregation,film morphology and energy loss analysis were systematically *** improved photovoltaic performance of PE71:Y6 mainly originates from the better interpenetrating network structure toward facilitating exciton seperation and free charge carrier *** results indicate that IID-based D-π-A polymers can also be utilized in non-fullerene OSCs and the alkyl chains on the thieno[3,2-b]thiopheneπ-bridge have a vital effect on the photovoltaic performance.

关键词： isoindigo thieno[3,2-b]thiophene alkyl chain non-fullerene organic solar cells

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考虑摩擦因数的薄壁胀环缓冲性能研究

强度与环境 2024年第4期51卷 43-48页

作者：李微微许斌华洲夏津付丽强上海机电工程研究所上海201109

为避免爆炸螺栓解锁冲击引发飞行器结构破坏或电子设备失效及运动部件回弹,需要对冲击能量进行缓冲吸收并对运动部件进行回弹抑制。将具有良好缓冲吸能特性且变形可控的薄壁胀环结构应用于舱段级间分离缓冲吸能装置中。为系统评价摩擦... 详细信息

为避免爆炸螺栓解锁冲击引发飞行器结构破坏或电子设备失效及运动部件回弹,需要对冲击能量进行缓冲吸收并对运动部件进行回弹抑制。将具有良好缓冲吸能特性且变形可控的薄壁胀环结构应用于舱段级间分离缓冲吸能装置中。为系统评价摩擦因数对薄壁胀环结构缓冲性能的影响,采用有限元计算方法,对不同摩擦因数下薄壁胀环的力学性能及缓冲吸能效果进行了分析与对比,并通过缓冲试验进行了验证。结果表明,在相同冲击条件下,随着摩擦因数增大,轴向制动位移逐渐减小、轴向冲击力逐渐增大、总吸能效果提升。

关键词：薄壁胀环缓冲吸能摩擦因数数值计算

Adjuvant chemotherapy with paclitaxel and cisplatin in lymph node-positive thoracic esophageal squamous cell carcinoma

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Chinese Journal of Cancer Research 2017年第2期29卷 149-155页

作者： liangze Zhang weiwei li Xiao Lyu Yan Song Yousheng Mao Shaoming Wang Jing Huang Department of Thoracic Surgical Oncology National Cancer Center/Cancer Hospital Chinese Academy of Medical Sciences & Peking Union Medical College Beijing 100021 China Department of Medical Oncology the First Affiliated Hospital of Xinxiang Medical University Xinxiang 453100 China Department of Medical Oncology Central Hospital of Zibo Zibo 255036 China Department of Medical Oncology National Cancer Center/Cancer Hospital Chinese Academy of Medical Sciences & Peking Union Medical College Beijing 100021 China Department of Cancer Epidemiology National Cancer Center/Cancer Hospital Chinese Academy of Medical Sciences & Peking Union Medical College Beijing 100021 China

Objective： No standard postoperative adjuvant chemotherapy has ever been established in node-positive esophageal squamous cell carcinoma （ESCC）. This is a study to explore the effect of postoperative paelitaxel （PTX） and cisplatin （DDP） in lymph node-positive, completely resected thoracic ESCC patients. Methods： We conducted a prospective phase II trial. Patients had pathologically node-positive thoracic ESCC with negative margins. Outcomes of disease-free survival （DFS） and overall survival （OS） were compared with a matched historical control cohort. The postoperative chemotherapy regimen consisted of 4 to 6 cycles of PTX 150 mg/m2 administered intravenously on d 1 followed by DDP 50 mg/m2 on d 2 every 14 d. Results： Forty-three patients were accrued from December 2007 to May 2012 at Cancer Hospital of Chinese Academy of Medical Sciences for adjuvant chemotherapy. The historical control group consisted of 80 patients who received complete resection but no adjuvant chemotherapy during the same period of time. Of the 43 patients with adjuvant chemotherapy, 37 （86.0%） patients completed 4 to 6 cycles of chemotherapy. The 3-year DFS rates were 56.3% in the adjuvant group and 34.6% in the control group （P=0.006）. The 3-year OS rates were 55.0% in the adjuvant group and 37.5% in the control group （P=0.013）. Multivariate analysis revealed that postoperative chemotherapy was the significant predictor for improved OS （P=0.005）. Conclusions： Biweekly adjuvant PTX and DDP might improve 3-year DFS and OS in lymph node-positive, curatively resected thoracic ESCC patients. These conclusions warrant further study in randomized phase III clinical trials.

关键词： Esophageal cancer adjuvant chemotherapy surgery paclitaxel cisplatin

基于频域反射法的受潮10 kV冷缩电缆中间接头阻抗特性研究

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四川电力技术 2024年第2期47卷 39-44页

作者：李巍巍刘畅张华罗洋宁鑫吴驰国网四川省电力公司电力科学研究院四川成都610041

冷缩电缆中间接头受潮是造成其故障的重要原因之一。现有研究已表明,存在受潮缺陷的冷缩电缆中间接头阻抗特性会发生变化,通过频域反射法对整根电缆的阻抗不连续点进行检测,分析其阻抗特性可实现缺陷的定位与类型的判断。因此,开展受潮... 详细信息

冷缩电缆中间接头受潮是造成其故障的重要原因之一。现有研究已表明,存在受潮缺陷的冷缩电缆中间接头阻抗特性会发生变化,通过频域反射法对整根电缆的阻抗不连续点进行检测,分析其阻抗特性可实现缺陷的定位与类型的判断。因此,开展受潮冷缩电缆中间接头阻抗特性的研究,可为电缆中间接头的受潮诊断提供理论依据与数据支撑。为此,对一根10 kV冷缩电缆中间接头样本开展加速受潮实验,采用反射系数谱测试仪定期检测其阻抗特性并进行研究。实验结果表明:随着受潮程度的增加,冷缩电缆中间接头阻抗不匹配峰幅值呈先减小后增大的趋势;对其时域反射波形进行恢复后发现,其时域波形的极性特征呈从“左正右负”到“左右持平”再到“左负右正”的变化情况。

关键词：冷缩电缆中间接头受潮缺陷阻抗特性时域反射特征

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爆炸螺栓解锁信号输出装置设计改进

装备环境工程 2024年第8期21卷 111-116页

作者：李微微张保刚许斌刘广夏津上海机电工程研究所上海201109

目的对爆炸螺栓解锁试验中出现的解锁反馈装置工作故障现象进行虚拟复现,定位故障原因,进而提出改进方案。方法综合利用CREO软件和ABAQUS软件,建立解锁信号输出装置有限元模型,利用有限元计算方法开展动力学仿真分析,对爆炸螺栓解锁时... 详细信息

目的对爆炸螺栓解锁试验中出现的解锁反馈装置工作故障现象进行虚拟复现,定位故障原因,进而提出改进方案。方法综合利用CREO软件和ABAQUS软件,建立解锁信号输出装置有限元模型,利用有限元计算方法开展动力学仿真分析,对爆炸螺栓解锁时的解锁信号输出装置高速动作过程进行模拟,评估关键结构的刚度与强度状况,进而定位装置故障原因。结果基于故障原因,提出组合式双螺母结构形式,改善解锁信号输出装置整体的受力状态,提升结构在高冲击载荷环境下的可靠性,并通过爆炸螺栓解锁试验进行了实际验证和效果评定。结论有限元计算方法能够对解锁信号输出装置故障原因进行虚拟复现,且改进后的装置结构形式合理可行。

关键词：解锁信号爆炸螺栓故障定位虚拟复现有限元仿真组合式双螺母

212-kHz-linewidth,transform-limited pulses from a single-frequency Q-switched fiber laser based on a few-layer Bi_2Se_3 saturable absorber

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Photonics Research 2018年第10期6卷 I0031-I0037页

作者： weiwei li JINHAI ZOU YIZHONG HUANG KAIJIE WANG TUANJIE DU SHUISEN JIANG ZHENGQIAN LUO Department of Electronic Engineering Xiamen University

Conventional Q-switched fiber lasers operating at multi-longitudinal-mode oscillation usually suffer from selfmode-locking-induced temporal instability, relatively strong noise, and low coherence. Here, we address the challenge through demonstrating, for the first time, to the best of our knowledge, a single-longitudinal-mode(SLM)Er-doped fiber(EDF) laser passively Q-switched by a few-layer Bi_2Se_3 saturable absorber(SA). The Bi_2Se_3 SA prepared by the liquid-phase exfoliation method shows a modulation depth of ～5% and saturation optical intensity of 1.8 MW∕cm^2. A section of 1-m unpumped EDF together with a 0.06-nm-bandwidth fiber Bragg grating is used as an ultra-narrow autotracking filter to realize SLM oscillation. Stable SLM Q-switching operation at 1.55 μm is successfully achieved with the spectral linewidth as narrow as 212 kHz and the pulse duration of2.54 μs, manifesting near-transform-limited pulses with a time-bandwidth product of 0.53. In particular, we found that the SLM Q-switching possesses the higher signal-to-noise ratios of 62 dB(optical) and 48 dB(radio frequency), exhibiting its advantages of low noise and high stability. Such an SLM Q-switched fiber laser could gain great interest for some applications in coherent detection, coherent optical communications, and high-sensitivity optical sensing.

关键词：光纤激光器通讯技术发展现状技术创新

Reliability analysis of magnetic logic interconnect wire subjected to magnet edge imperfections

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Journal of Semiconductors 2018年第2期39卷 45-50页

作者： Bin Zhang Xiaokuo Yang Jiahao liu weiwei li Jie Xu Department of Foundation Air Force Engineering University Tsinghua National Laboratory for Information Science and Technology Institute of Microelectronics Tsinghua University

Nanomagnet logic（NML） devices have been proposed as one of the best candidates for the next generation of integrated circuits thanks to its substantial advantages of nonvolatility, radiation hardening and potentially low power. In this article, errors of nanomagnetic interconnect wire subjected to magnet edge imperfections have been evaluated for the purpose of reliable logic propagation. The missing corner defects of nanomagnet in the wire are modeled with a triangle, and the interconnect fabricated with various magnetic materials is thoroughly investigated by micromagnetic simulations under different corner defect amplitudes and device spacings. The results show that as the defect amplitude increases, the success rate of logic propagation in the interconnect decreases. More results show that from the interconnect wire fabricated with materials, iron demonstrates the best defect tolerance ability among three representative and frequently used NML materials, also logic transmission errors can be mitigated by adjusting spacing between nanomagnets. These findings can provide key technical guides for designing reliable interconnects.

关键词： nanomagnet logic device defect interconnect reliability