检索结果-南通市图书馆

Enhancing the crystallinity and stability of perovskite solar cells with 4-tert-butylpyridine induction for efficiency exceeding 24%

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2024年第6期93卷 1-7,I0001页

作者： You liu Lishuang Zheng Kuanxiang Zhang Kun Xu Weicheng Xie Jue Zhang Yulu Tian Tianyuan liu Hanzhong Xu ruoming Ma Wei Huang Jiahui Chen Jusheng Bao Chen Chen Yongsheng Zhou Xuchun Wang Junming Chen Jungan Wang College of Chemistry and Materials Engineer.ng Anhui Science and Technology UniversityBengbu 233000AnhuiChina Anhui Province Quartz Sand Purification and Photovoltaic Glass Engineer.ng research Center Chuzhou 233100AnhuiChina Triumph Photovoltaic Materials Co.Ltd BengbuAnhuiChina National Laboratory of Solid State Microstructures School of PhysicsNanjing UniversityNanjing 210009JiangsuChina JinkoSolar Holding Co.Ltd HainingZhejiangChina

Perovskite solar cells(PSCs)have emerged as a promising photovoltaic technology because of their high light absorption coefficient,long carrier diffusion distance,and tunable ***,PSCs face challenges such as hysteresis effects and stability *** this study,we introduced a novel approach to improve film crystallization by leveraging 4-tert-butylpyridine(TBP)molecules,thereby enhancing the performance and stability of *** findings demonstrate the effective removal of PbI_(2)from the perovskite surface through str.ng coordination with TBP ***,by carefully adjusting the concentration of the TBP solution,we achieved enhanced film crystallinity without disrupting the perovskite *** TBP-treated perovskite films exhibit a low defect density,improved crystallinity,and improved carrier *** a result,the PSCs manufactured with TBP treatment achieve power conversion efficiency(PCE)exceeding 24%.Moreover,we obtained the PCE of 21.39%for the 12.25 cm^(2)module.

关键词： 4-tert-butylpyridine Film crystallization Perovskite solar cells Power conversion efficiency Stability improvement

Local State Capacity and Uneven Taxation across Industrial Firms

在线全文

学校读者我要写书评

暂无评论

China & World Economy 2024年第3期32卷 191-214页

作者： Linke Hou Zhikuo liu Qi Zhang xiaolu Zhao the Economic research Center Shandong UniversityChina China Center for Economic Studies Fudan UniversityChina School of Economics Ocean University of ChinaChina

In this research we investigate the association between local state capacity(LSC)and effective tax burdens(ETBs)on industrial firms within counties between 1998 and *** LSC measures a state's capacity for policy implementation and specifically its ability to acquire low-cost agricultural land for nonagricultural(industrial or commercial)*** on China's government-led development experience since the 1990s,we draw on two unique household survey datasets to capture LSC at county *** find robust evidence that greater LSC was associated with much lower ETBs on large industrial *** taxation pattern implies local government's primary reliance on larger manufactur.ng firms,while the ETBs for small-and-medium enterprises are not as prominently *** research highlights that LSC can affect both the amount of revenue a local government can generate and the methods it uses to collect these revenues.

关键词： China effective tax burdens land requisition local government local state capacity

Will the State-owned Capital Transfer Policy Enhance the Sustainability of the Urban Employee Basic Pension Insurance Fund in China?

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

China & World Economy 2024年第3期32卷 98-129页

作者： Jia Wang Huan liu Mei Li Han Li School of Economics Xiamen UniversityChina School of Economics and Management Nanjing Agricultural UniversityChina School of Economics and Management Wuhan UniversityChina

To analyze the efect of the state-owned capital transfer policy on the sustainability of China's urban employee basic pension insurance fund(CUEBPIF),this study develops an actuarial model for pension *** results reveal the following:(i)Without policy intervention,the CUEBPIF would face a deficit in 2027 and a cumulative shortfall of rMB207.44 trillion by 2050,and the proportion of fiscal subsidies for the CUEBPIF in the total fiscal expenditure would increase to 12.86 percent in 2050.(i)Based on a delayed retirement policy,the transfer of 10 percent of state-owned capital can delay the onset of the fund deficit by 6 years,and the accumulated shortfall in 2050 would fall to rMB39.42 trillion,and the proportion of fiscal subsidies would decrease by I1.77 percentage points.(ii)The state-owned capital transfer policy can improve the sustainability of the CUEBPIF and reduce the burden of enterprise social security contributions when the transfer ratio increases to 20 percent.

关键词： burden of enterprise social security contributions delayed retirement policy state-owned capital transfer policy sustainability of basic pension insurance fund

Emerging probing perspective of two-dimensional materials physics:terahertz emission spectroscopy

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Light(Science & Applications) 2024年第7期13卷 1278-1298页

作者： Yifei Wu Yuqi Wang Di Bao xiaonan Deng Simian Zhang Lin Yu-chun Shengxian Ke Jianing liu Yingjie liu Zeli Wang Pingren Ham Andrew Hanna Jiaming Pan Xinyue Hu Zhengcao Li Ji Zhou Chen Wang State Key Laboratory of New Ceramics and Fine Processing Key Laboratory of Advanced Materials of Ministry of EducationSchool of Materials Science and EngineeringTsinghua University100084 BeijingChina Beijing Advanced Innovation Center for Integrated Circuits 100084 BeijingChina

Terahertz(THz)emission spectroscopy(TES)has emerged as a highly effective and versatile technique for investigating the photoelectric properties of diverse materials and nonlinear physical processes in the past few ***,research on two-dimensional(2D)materials has experienced substantial growth due to their atomically thin structures,exceptional mechanical and optoelectronic properties,and the potential for applications in flexible electronics,sensing,and ***,these materials offer advantages such as tunable bandgap,high carrier mobility,wideband optical absorption,and relatively short carrier *** applying TES to investigate the 2D materials,their interfaces and heterostructures,rich information about the interplay among photons,charges,phonons and spins can be unfolded,which provides fundamental understanding for future *** it is timely to review the nonlinear processes underlying THz emission in 2D materials including optical rectification,photon-drag,high-order harmonic generation and spin-to-charge conversion,showcasing the rich diversity of the TES employed to unravel the complex nature of these *** applications based on THz emissions,such as THz lasers,ultrafast imaging and biosensors,are also *** further,we analyzed the unique advantages of spintronic terahertz emitters and the future technological advancements in the development of new THz generation mechanisms leading to advanced THz sources characterized by wide bandwidth,high power and integration,suitable for industrial and commercial *** continuous advancement and integration of TES with the study of 2D materials and heterostructures promise to revolutionize research in different areas,including basic materials physics,novel optoelectronic devices,and chips for post-Moore’s era.

关键词： optoelectronic versatile exceptional

植物提取物抑制反刍动物瘤胃甲烷排放研究进展

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

动物营养学报 2024年第5期36卷 2752-2760页

作者：肖莉刘子豪南雪梅熊本海黑龙江八一农垦大学动物科技学院大庆163319 中国农业科学院北京畜牧兽医研究所动物营养学国家重点实验室北京100193

植物及其次生代谢产物含有多种生物活性物质,具有多能效性,可作为天然饲草资源或饲料添加剂,用于反刍动物营养补充及疾病防治。自2019年“禁抗”目标提出以来,植物提取物成为替代抗生素的首要研究对象,发挥着不可或缺的重要作用。此外,... 详细信息

植物及其次生代谢产物含有多种生物活性物质,具有多能效性,可作为天然饲草资源或饲料添加剂,用于反刍动物营养补充及疾病防治。自2019年“禁抗”目标提出以来,植物提取物成为替代抗生素的首要研究对象,发挥着不可或缺的重要作用。此外,由于近年来温室效应愈演愈烈,给人类社会带来了巨大的危害,而多种植物提取物凭借其调节瘤胃菌群、有效抑制产甲烷菌群丰度的特性引起重视。植物提取物具有来源广、无污染、低毒性等特点,使其成为一类极具潜力的绿色、天然甲烷抑制剂。本文就植物提取物抑制甲烷排放的研究进展进行了综述总结,为实现甲烷减排提供理论参考和实践指导。

关键词：植物提取物反刍动物甲烷产甲烷菌活性物质瘤胃发酵

Employee Stock Ownership Plans and Stock-price Informativeness

在线全文

学校读者我要写书评

暂无评论

China & World Economy 2024年第3期32卷 162-190页

作者： Yuehua Zuo Xin Huang xiaojun liu Yunhao Dai School of Economics Huazhong University of Science and TechnologyChina School of Economics and Modern Economics research Center Huazhong University of Science and TechnologyChina

This study examines the impact of employee stock ownership plans(ESOPs)on stock-price informativeness in Chinese stock *** findings indicate that firms implementing ESOPs experienced an average 11.89 percent increase in stock-price *** plans improved stock-price informativeness through increased external attention and *** event study shows that ESOPs gave rise to an announcement effect,driven by anticipated performance improvements and the novelty associated with ESOPs.A mechanism analysis demonstrates that the implementation of ESOPs attracted market attention,and the increased market supervision resulting from this mitigated the moral hazards of management associated with *** with more positive signals exerted a greater ***,ESOPs that prioritized management incentives gained more recognition in the *** the incentive effects of ESOPs were weaker than those of equity incentive plans and the ESOPs lost novelty over time,the annual announcement effect diminished *** findings underscore the necessity of str.ngthening ESOP incentives for continued optimization of priceefficiency.

关键词： announcement effect corporate governance employee stock ownership plan stock-price informativeness

Explor.ng a new path of green and efficient utilization of sinter return fine to produce composite pellets

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Iron and Steel research International 2024年第7期31卷 1610-1622页

作者： Yan-biao Chen Wen-guo liu Hao Guo Jing-song Wang Qing-guo Xue Hai-bin Zuo State Key Laboratory of Advanced Metallurgy University of Science and Technology BeijingBeijing 100083China MCC Capital Engineer.ng and research Incorporation Limited Beijing 100176China

Efficient utilization of sinter return fine is an important measure to reduce cost,increase efficiency,save energy and reduce emission.A new path of green and efficient utilization of return fine was proposed to produce composite *** metallurgical properties of composite pellets under the condition of hydrogen-rich blast furnace were *** experimental results indicate that the coated concentrate was consolidated for the composite pellets through normal Fe_(2)O_(3) *** the surface of core return fine,the liquid phase formed due to its low-melting point,assimilated the adjacent concentrate,and then consolidated with the temperature *** with regular pellets,the com-pressive str.ngth and reduction swelling index of composite pellets were decreased,but the reducibility index and softening-melting properties were *** addition,the reduction degradation index of composite pellets was sig-nificantly higher than that of ***,adding composite pellets was conducive to indirect reduction in blast furnace,reducing fuel ratio and improving production *** to the effect of the roasting system on the metallurgical properties,the roasting temperature and time were determined as 1250℃and 30 min,*** composite pellets can be produced under the traditional pelletizing process.

关键词： Sinter return fine Composite pellet roasting system Metallurgical property Hydrogen-rich blast furnace

Critical approaches in the catalytic transformation of sugar isomerization and epimerization after Fischer-History,challenges,and prospects

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Green Energy & Environment 2024年第3期9卷 435-453页

作者： Da-Ming Gao Xun Zhang Haichao liu Hidemi Fujino Tingzhou Lei Fuan Sun Jie Zhu Taoli Huhe National-local Joint Engineer.ng research Center of Biomass refine and High-Quality Utilization Changzhou UniversityChangzhou213164China Institute of Urban and rural Mining research Changzhou UniversityChangzhou213164China Changzhou Key Laboratory of Biomass Green Safe&High Value UtilizationChangzhou UniversityChangzhou213164China Beijing National Laboratory for Molecular Science College of Chemistry and Molecular EngineeringPeking UniversityBeijing100871China Department of rehabilitation Science Kobe University Graduate School of Health SciencesKobe654-0142Japan

The transformation of aldose to ketose or common sugars into rare saccharides,including rare ketoses and aldoses,is of great value and interest to the food industry and for saccharidic biomass utilization,medicine,and the synthesis of ***,high-fructose corn syrup(HFCS)is industrially produced in more than 10 million tons annually using immobilized glucose *** low-calorie saccharides such as tagatose and psicose,which are becoming popular sweeteners,have also been produced on a pilot scale in order to replace sucrose and ***,current catalysts and catalytic processes are still difficult to utilize in biomass conversion and also have str.ng substrate dependence in producing high-value,rare *** the specific reaction properties of saccharides and catalysts,since the pioneer.ng discovery by Fischer,various catalysts and catalytic systems have been discovered or developed in attempts to extend the reaction pathways,improve the reaction efficiency,and to potentially produce commercial *** this review,we trace the history of sugar isomerization/epimerization reactions and summarize the important breakthroughs for each reaction as well as the difficulties that remain unresolved to date.

关键词： rare sugars Isomerization Ketonization Epimerization Catalytic transformation

Accurate prediction of myopic progression and high myopia by machine learning

在线全文

学校读者我要写书评

暂无评论

Precision Clinical Medicine 2024年第1期7卷 14-20页

作者： Jiahui Li Simiao Zeng Zhihuan Li Jie Xu Zhuo Sun Jing Zhao Meiyan Li Zixing Zou Taihua Guan Jin Zeng Zhuang liu Wenchao xiao ran Wei Hanpei Miao Ian Ziyar Junxiong Huang Yuanxu Gao Yangfa Zeng Xing-Tao Zhou Kang Zhang Guangzhou Women and Children's Medical Center Guangzhou Medical UniversityGuangzhou 510120China Guangzhou National Laboratory Guangzhou 510o0oChina Zhuhai International Eye Center of the First Affiliated Hospital of Faculty of Medicine Macao University of Science and TechnologyZhuhai 519000China Beijing Institute of Ophthalmology Beijing Tongren Eye CenterBeijing Tongren HospitalCapital Medical UniversityBeijing 100069China Key Laboratory of Myopia Ministry of HealthShanghai Key Laboratory of Visual Impairment and RestorationDepartment of OphthalmologyEye InstituteEye and EarNoseand Throat HospitalFudan UniversityShanghai 200031China DongguanPeople's Hospital The First School of Clinical MedicinelSouthern Medical UniversityDongguan 523059China State Key Laboratory of Ophthalmology Zhongshan Ophthalmic CenterSun Yat-sen UniversityGuangzhou 510060China Wenzhou Eye Hospital and Institute for Advanced Study on Eye Health and Diseases Wenzhou Medical UniversityWenzhou 32500oChina

Background Myopia is a leading cause of visual impairment in Asia and ***,accurately predicting the progression of myopia and the high risk of myopia remains a *** study aims to develop a predictive model for the development of *** We first retrospectively gathered 612530 medical records from five independent cohorts,encompassing 227543 patients r.nging from infants to young ***,we developed a multivariate linear regression algorithm model to predict the progression of myopia and the risk of high *** The model to predict the progression of myopia achieved an r^(2) value of 0.964 vs a mean absolute error(MAE)of 0.119D[95%confidence interval(CI):0.119,1.146]in the internal validation *** demonstrated str.ng generalizability,maintaining consistent performance across external validation sets:r^(2)=0.950 vs MAE=0.119D(95%CI:0.119,1.136)in validation study 1,r^(2)=0.950 vs MAE=0.121D(95%CI:0.121,1.144)in validation study 2,and r^(2)=0.806 vs MAE=−0.066D(95%CI:−0.066,0.569)in the Shanghai Children Myopia *** the Beijing Children Eye Study,the model achieved an r^(2) of 0.749 vs a MAE of 0.178D(95%CI:0.178,1.557).The model to predict the risk of high myopia achieved an area under the curve(AUC)of 0.99 in the internal validation set and consistently high area under the curve values of 0.99,0.99,0.96 and 0.99 in the respective external validation *** Our study demonstrates accurate prediction of myopia progression and risk of high myopia providing valuable insights for tailor.ng strategies to personalize and optimize the clinical management of myopia in children.

关键词： myopia progression machine learning prevention precision medicine