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Does labor off-farm employment inevitably lead to land rent out?Evidence from China

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Journal of Mountain Science 2019年第3期16卷 689-700页

作者： DENG Xin XU Ding-de zeng miao QI Yan-bin College of Economics Sichuan Agricultural University Sichuan Center for Rural Development Research College of ManagementSichuan Agricultural University School of Economics Sichuan University

The focus of land economics is on how to decrease the misallocation of resources to achieve an optimal allocation of resources. Both the theories of new economics of labor migration(NELM) and the conclusions of empirical studies reveal that land resources will inevitably be reallocated(e.g., rented out) if the resources of family labor are reallocated(e.g., off-farm employment). However, this study reveals that off-farm employment does not inevitably lead to land rent out. More precisely, this study uses survey data on 8031 peasant households from 27 provinces in China and explores the relationship between off-farm employment and land rent out by describing spatial features and through empirical analysis(e.g., IV-Probit model and IV-Tobit model). The results show the following: 1) There is an indirect relationship between off-farm employment and land rent out regarding spatial area aggregation, i.e., regions with a higher ratio of off-farm employment also have a lower area of land rent out. 2) Off-farm employment is significantly positively correlated with the behavior of land rent out, but its square is significantly negatively correlated with the behavior, i.e., there is an inverted U-shaped relationship between off-farm employment and the behavior of land rent out, with the turning point being 55.55% offfarm employment. 3) Off-farm employment is significantly positively correlated with the area of land rent out, but its square is significantly negatively correlated with the area, i.e., there is an inverted Ushaped relationship between off-farm employment and the area of land rent out, with the turning point being 56.22% off-farm employment. This study helps explain why China has a high ratio of off-farm employment but a lower rate of land rent out.

关键词： Rural labor Off-farm employment Land rent out Rent out area China

Listen and talk to the older patients:a critical emancipatory reflection on the practice of communication issues

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Frontiers of Nursing 2019年第1期6卷 35-40页

作者： Qiao-miao zeng Lian-Xiang He Department of Oncological Radiotherapy XiangYa Hospital Central South University Nursing Administration Department XiangYa Hospital Central South University

Objective: Reflection is a process of deliberating thinking and examining one's practice in the past and thereby encouraging nurses to make improvements in future care delivery. This work outlines a piece of reflection involving the practice of communication between nurses and the elderly, to emancipate the authors from their constraints, help to find values as practitioners, and gain a greater understanding of the nurse-patient ***: Using Smyth's four-stage model as a guide, as well as empirical and theoretical knowledge on nurse-patient relationships, this paper presents a deep reflection on the relationship that the authors developed with elderly patients and their families, encountered during the practice as a nurse. By applying the four main stages consisting of describe, inform, confront, and reconstruct, this model enabled the authors to frame, describe the practice issue, and explore the meaning behind it, which helps to facilitate a structured ***: Critical emancipatory reflection, in association with the Espoused theory and Theory-in-use, as well as reflexivity, critical social theory, and hegemony, was applied to uncover the various power relationships and constraining forces in the authors' practice involved in communicating with the elderly, such as the underlying false consciousness, hegemony, hidden assumptions, influential values, and dominant power structure, which are subtle and persuasive. By applying this process of critical reflection, transformative practice could be ***: The process of critical reflection facilitated the development of the abilities required to develop and maintain the nursepatient relationship. It helps to enhance the care of old patients and their families, which illuminates the future nursing practice.

关键词： emancipatory reflection older patients communication nurse-patient relationship person-centered care

Correlation Analysis of Transient Heat Transfer Characteristics for Air Precooling Aggregate

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Journal of Thermal Science 2017年第2期26卷 144-152页

作者： GUO Chaohong zeng miao LU Fei TANG Dawei GUAN Wei LI Li FU Tingwu Institute of Engineering Thermophysics Chinese Academy of Sciences Northwest Engineering Corporation Limited Power Construction Corporation of China

In dam works, air precooling of aggregate is a common and effective method to avoid temperature cracks in concrete structure. In order to offer a reliable design theory for the air precooling process to avoid unreasonable energy consumption, the transient heat transfer characteristics of the aggregate are intensively analyzed. The combined structure of the aggregate and the interstitial space in the hopper is treated as a porous structure, and the space-average method is used to simulate the transient heat transfer process. Simulation results show that size of the hopper and the average air velocity in the cross section have great influence on the transient heat transfer process of the aggregate, while the porosity in the range of 0.4-0.5 has little influence. Nomograms are abstracted from simulation results, and then correlations of the compared excess temperature are precisely fitted to predict the air precooling transient heat transfer process of the aggregate.

关键词： Air precooling Aggregate Transient heat transfer Nomogram

Adsorption of Au(Ⅲ) ions on xanthated crosslinked chitosan resin in hydrochloric acid medium

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Rare Metals 2021年第3期40卷 743-748页

作者： miao zeng Ting-An Zhang Guo-Zhi Lv Zhi-He Dou Yan Liu Ying Zhang Key Laboratory of Ecological Utilization of Multi-metal Intergrown Ores of Ministry of Education School of Materials and MetallurgyNortheastern UniversityShenyang 110819China

Xanthated crosslinked chitosan(XCCS) resin prepared under microwave irradiation were used for adsorbing Au(Ⅲ) ions in hydrochloric acid *** influence of pH and temperature on the adsorption capacity of XCCS was *** original XCCS and the loaded XCCS were characterized by scanning electron microscope(SEM) and X-ray diffraction(XRD),*** results indicate that the XCCS has ability to adsorb Au(Ⅲ) ions and the maximum adsorption capacity of Au(Ⅲ) ions on XCCS is observed at pH 1 and 20℃.The data of batch adsorption tests are fitted to kinetic models and isotherm models,*** kinetics of adsorption process is found to follow pseudo-second-order kinetic rate model,and equilibrium data agree very well with the Langmuir *** calculation of the Au(Ⅲ) ions adsorption process indicates that the adsorption process is spontaneous and endothermic.

关键词： Xanthated crosslinked chitosan Adsorption Au(Ⅲ)ions

Curcumin inhibits the growth and invasion of gastric cancer by regulating long noncoding RNA AC022424.2

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World Journal of Gastrointestinal Oncology 2024年第4期16卷 1437-1452页

作者： Bin-Sheng Wang Chen-Li Zhang Xiang Cui Qiang Li Lei Yang Zhi-Yun He Ze Yang miao-miao zeng Nong Cao Department of General Surgery First Hospital of Lanzhou UniversityLanzhou 730000Gansu ProvinceChina School of Basic Medical Sciences Lanzhou UniversityLanzhou 730000Gansu ProvinceChina Third Department of General Surgery First Hospital of Lanzhou UniversityLanzhou 730000Gansu ProvinceChina

BACKGROUND Gastric cancer,characterized by a multifactorial etiology and high heterogeneity,continues to confound researchers in terms of its ***,a natural anticancer agent,exhibits therapeutic promise in gastric *** effects include promoting cell apoptosis,curtailing tumor angiogenesis,and enhancing sensitivity to radiation and *** noncoding RNAs(lncRNAs)have garnered significant attention as biomarkers for early screening,diagnosis,treatment,and drug response because of their remarkable specificity and *** investigations have revealed an association between aberrant lncRNA expression and early diagnosis,clinical staging,metastasis,drug sensitivity,and prognosis in gastric cancer.A profound understanding of the intricate mechanisms through which lncRNAs influence gastric cancer develop-ment can provide novel insights for precision treatment and tailored management of patients with gastric *** study aimed to unravel the potential of curcumin in suppressing the malignant behavior of gastric cancer cells by upregu-lating specific lncRNAs and modulating gastric cancer onset and *** To identify lncRNAs associated with curcumin treatment and investigate the role of lncRNA AC022424.2 in the effects of curcumin on gastric cancer cell apoptosis,proliferation,and ***,these findings were validated in clinical *** The study employed CCK-8 assays to assess the impact of curcumin on gastric cancer cell proliferation,flow cytometry to investigate its effects on apoptosis,and scratch and Transwell assays to evaluate its influence on the migration and invasion of BGC-823 and MGC-803 *** blotting was used to gauge changes in the protein expression levels of CDK6,CDK4,Bax,Bcl-2,caspase-3,P65,and the PI3K/Akt/mTOR pathway in gastric cancer cell lines after curcumin *** expression of lncRNAs before and after curcumin treatment was assessed using lncRNA seq

关键词： Gastric cancer Curcumin Long noncoding RNA AC022424.2 Apoptosis Akt/PI3K pathway Lymph metastasis

Exciton diffusion and dissociation in organic and quantum-dot solar cells

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SmartMat 2023年第6期4卷 11-30页

作者： Dan He miao zeng Zhenzhen Zhang Yang Bai Guichuan Xing Hui-Ming Cheng Yuze Lin Department of Metallurgy and Applied Physical Chemistry College of Chemistry and Chemical EngineeringCentral South UniversityChangshaChina Beijing National Laboratory for Molecular Sciences CAS Key Laboratory of Organic SolidsInstitute of ChemistryChinese Academy of SciencesBeijingChina Faculty of Materials Science and Energy Engineering/Institute of Technology for Carbon Neutrality Shenzhen Institute of Advanced TechnologyChinese Academy of SciencesShenzhenChina Joint Key Laboratory of the Ministry of Education Institute of Applied Physics and Materials EngineeringUniversity of MacaoMacaoChina University of Chinese Academy of Sciences BeijingChina Australian Institute for Bioengineering and Nanotechnology The University of Queensland BrisbaneSt LuciaQueenslandAustralia

For the process of photovoltaic conversion in organic solar cells(OSCs)and quantum-dot solar cells(QDSCs),three of four steps are determined by exciton behavior,namely,exciton generation,exciton diffusion,and exciton ***,it is of great importance to regulate exciton behavior in OSCs and QDSCs for achieving high power conversion *** to the rapid development in materials and device fabrication,great progress has been made to manage the exciton behavior to achieve prolonged exciton diffusion length and improved exciton dissociation in recent *** this review,we first introduce the parameters that affect exciton behavior,followed by the methods to measure exciton diffusion ***,we provide an overview of the recent advances with regard to exciton behavior investigation in OSCs and QDSCs,including exciton lifetime,exciton diffusion coefficient,and exciton ***,we propose future directions in deepening the understanding of exciton behavior and boosting the performance of OSCs and QDSCs.

关键词： exciton behavior exciton diffusion exciton dissociation organic solar cells quantum-dot solar cells

Aromatic inorganic acid radical

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Science China Chemistry 2019年第12期62卷 1656-1665页

作者： Jiawen Zhou Weiya Zhu miao zeng Qingqing Yang Ping Li Linfeng Lan Junbiao Peng Yuan Li Fei Huang Yong Cao State Key Laboratory of Luminescent Materials and Devices Institute of Polymer Optoelectronic Materials and DevicesSouth China University of TechnologyGuangzhou 510640China Key Laboratory for Organic Electronics and Information Displays&Institute of Advanced Materials Jiangsu National Synergetic Innovation Center for Advanced MaterialsNanjing University of Posts&TelecommunicationsNanjing 210023China

Stable radicals are challenging to prepare due to their intrinsic high ***,three trisphenolamine radicals were readily synthesized and exhibited unexpected thermal/electrochemical stability and semiconductor *** three nitroxide radicals could be considered as a class of aromatized nitro groups or HNO3 *** closed-shell nitro-like and open-shell nitroxide resonance structure contribute to their outstanding ***,the tunable ground states,extremely low band gap and p-type charge transport properties were systematically *** importantly,the work presents the concept of aromatic inorganic acid radical(AIAR)and aggregation-induced radical(AIR)mechanism to understand the intrinsic structureproperty relationship of these *** addition,we provide a novel strategy for the design of stable and low bandgap radicals for organic electronics,magnetics,spintronics,etc.

关键词： organic electronics aromatic nitric acid radical aggregation-induced radical polycyclic aromatic hydrocarbons spintronics

Application of piezoelectric transient response in transducer acoustic power measurement

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Chinese Journal of Acoustics 2017年第1期36卷 18-28页

作者： zeng miao SHEN Yong LI Fu YANG zengtao WANG Hua Key Laboratory of Ultrasound Engineering in Medicine Co-Founded by Chongqing and the Ministry of Science and Technology College of Biomedical EngineeringChongqing Key Laboratory of Biomedical EngineeringChongqing Medical University Chongqing 400016 National Engineering Research Center of Ultrasound Medicine Chongqing 401121

To explore a more convenient method for measuring the focused ultrasound power, a piezoelectric ceramic plate was used to receive ultrasonic signal directly. Due to an acoustic force acts on the surface of piezoelectric ceramic plate, the piezoelectric response was obtained by means of electromechanical analogy, which was composed of voltage response caused by forced vibration and high frequency attenuation response caused by natural vibration. The conversion relationship between output signal of piezoelectric ceramic plate and acoustic power of transducer was analyzed. The envelope of output piezoelectric signal was extracted in twice, and a voltage amplitude curve with sinusoidal distribution that could describe the changes of acoustic power was obtained. Under different drive voltage of transducer, the maximum peak voltage of envelope curve was found respectively. Their squared values were made a linear fitting with acoustic power measured by acoustic power meter, and then the proportional coefficient of theoretical relational expression was calibrated. The experimental results are in good agreement with the theory. The relative error between calibrated theoretical acoustic power and that measured by acoustic power meter was less than 8.7%. The paper can provide a guideline for measuring acoustic power of transducer by using piezoelectric signal.

关键词： Application of piezoelectric transient response in transducer acoustic power measurement

Catalytic protection of stannous ion by ascorbic acid in diphosphonic acids solutions

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Nuclear Science and Techniques 1998年第2期9卷 121-123页

作者： Liu Guo-Zheng Liu Fei miao zeng-Xing Wang Yi-Shan and Fang Ji-Dong (Isotope Department, China Institute of Atomic Energy, Beijing 102413) Isotope Department China Institute of Atomic Energy Beijing 102413 China

The protective ability of ascorbic acid(Vc) on stannous ion and the influence of light irradiation on the stability of stannous ion in diphosphonate medium at pH=5 have been examined in order to attain minimal loss of stannous ion during the production of lyophilized radiopharmaceutical *** sum of stanous ion and Vc was determined with iodometric *** was shown that the protective ability of Vc was still strong at Vc concentration much lower than that of stannous ion and the illumination by fluorescent lamp was unfavorable to the stability of stannous *** change of pH in the range 3-9 did not affect the action of Vc significantly.

关键词：锡离子稳定性骨造影工具