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Water wettability in nanoconfined environment

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Science China(Physics,Mechanics & Astronomy) 2014年第5期57卷 836-843页

作者： zhou yahong GUO Wei JIANG Lei Beijing National Laboratory for Molecular Sciences (BNLMS) Key Laboratory of Organic SolidsInstitute of ChemistryChinese Academy of Sciences

Water confined in nanoscale space behaves quite differently from that in the *** example,in biological aquaporins and in carbon nanotubes,the traversing water molecules form a single file *** would stay in vapor state in extremely hydrophobic narrow nanopores owing to the physicochemical interactions between the water molecules and the surface of the nanopore.A spontaneous wet-dry transition has been identified in both biological and artificial *** nanopore is either fulfilled with liquid water or completely *** on this mechanism,the wetting and dewetting processes inside nanopores have been further developed into highly efficient nanofluidic gates that can be switched by external stimuli,such as light irradiation,electric potential,temperature,and mechanical *** review briefly covers the recent progress in the special wettability in nanoconfined environment,water transportation through biological or artificial nanochannels,as well as the smart nanofluidic gating system controlled by the water wettability.

关键词： wettability nanopore hydrophobic interaction ion channels gating

Semiparametric estimation of average treatment effect through a random coefficient dummy endogenous variable model

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Science China Mathematics 2014年第11期57卷 2415-2428页

作者： zhou yahong WANG LiMing HE XiaoDan School of Economics Shanghai University of Finance and EconomicsKey Laboratory of Mathematical Economics (SUFE) School of Statistics and Management Shanghai University of Finance and Economics School of Economics Shanghai University of Finance and Economics

This paper provides an estimation procedure for average treatment effect through a random coefficient dummy endogenous variable model. A leading example of the model is estimating the effect of a training program on earnings. The model is composed of two equations:an outcome equation and a decision *** the linear restriction in outcome and decision equations,Chen(1999) provided a distribution-free estimation procedure under conditional symmetric error distributions. In this paper we extend Chen's estimator by relaxing the linear index into a nonparametric function,which greatly reduces the risk of model misspecification. A two-step approach is proposed:the first step uses a nonparametric regression estimator for the decision variable,and the second step uses an instrumental variables approach to estimate average treatment effect in the outcome equation. The proposed estimator is shown to be consistent and asymptotically normally distributed. Furthermore,we investigate the finite performance of our estimator by a Monte Carlo study and also use our estimator to study the return of college education in different periods of China. The estimates seem more reasonable than those of other commonly used estimators.

关键词： random-coefficient model endogenous variable model symmetry

Self-Exfoliation of Flake Graphite for Bioinspired Compositing with Aramid Nanofiber toward Integration of Mechanical and Thermoconductive Properties

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Nano-Micro Letters 2022年第10期14卷 235-247页

作者： Limei Huang Guang Xiao Yunjing Wang Hao Li yahong zhou Lei Jiang Jianfeng Wang College of Materials Science and Engineering Hunan UniversityChangsha 410082People’s Republic of China College of Chemistry and Chemical Engineering Hunan UniversityChangsha 410082People’s Republic of China CAS Key Laboratory of Bio-Inspired Materials and Interface Sciences Technical Institute of Physics and Chemistry ChineseAcademy of SciencesBeijing 100190People’s Republic of China

Flexible yet highly thermoconductive materials are essential for the development of next-generation flexible electronic ***,we report a bioinspired nanostructured film with the integration of large ductility and high thermal conductivity based on self-exfoliated pristine graphene and three-dimensional aramid nanofiber network.A self-grinding strategy to directly exfoliate flake graphite into few-layer and few-defect pristine graphene is successfully developed through mutual shear friction between graphite particles,generating largely enhanced yield and productivity in comparison to normal liquid-based exfoliation strategies,such as ultrasonication,high-shear mixing and ball *** by nacre,a new bioinspired layered structural design model containing three-dimensional nanofiber network is proposed and implemented with an interconnected aramid nanofiber network and high-loading graphene nanosheets by a developed continuous assembly strategy of sol-gel-film *** is revealed that the bioinspired film not only exhibits nacre-like ductile deformation behavior by releasing the hidden length of curved aramid nanofibers,but also possesses good thermal transport ability by directionally conducting heat along pristine graphene nanosheets.

关键词： Graphene Aramid nanofiber Self-grinding exfoliation Bioinspired structure Functional material

Bioinspired Three-Dimensional Nanoporous Membranes for Salinity-Gradient Energy Harvesting

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Accounts of Materials Research 2023年第1期4卷 86-100页

作者： Jian Wang yahong zhou Lei Jiang College of Materials and Chemistry&Chemical Engineering Chengdu University of TechnologyChengdu 610059People’s Republic of China Key Laboratory of Bio-inspired Materials and Interface Science Technical Institute of Physics and ChemistryChinese Academy of SciencesBeijing 100190People’s Republic of China Key Laboratory of Bio-inspired Smart Interfacial Science and Technology of Ministry of Education School of ChemistryBeihang UniversityBeijing 100191People’s Republic of China

CONSPECTUS:Salinity-gradient energy represents a widespread,clean,environmentally friendly,and sustainable source of renewable energy,which has attracted great attention in the past *** harness this energy,interdisciplinary efforts from chemistry,materials science,environmental science,and nanotechnology have been made to develop efficient and low-cost approaches and materials for energy *** reverse electrodialysis(RED)systems are generally based on ion-exchange membranes,which usually suffer from ineffective mass transport,high membrane resistance,limited pore size,and concentration polarization,resulting in low output power density and poor energyconversion *** one promising material,nanofluidic channels with their unique transport properties,which can be attributed to nanoconfinement effect,enable highperformance reverse electrodialysis to efficiently harvest salinity-gradient *** to the unique porous architectures,three-dimensional(3D)nanoporous membranes demonstrate great potential for harvesting salinity-gradient *** is generally known that the porous membranes can be prepared by many methods;however,there are some shortcomings such as high costs,poor ion conductance,and fragility limiting the practical *** simple and versatile approaches to lowcost fabrication of 3D nanoporous membranes have been developed in recent *** example,self-assembly provides an effective route of constructing functional materials and organizing them into 3D *** this Account,we mainly review our recent progress in the design and fabrication of bioinspired 3D nanoporous membranes for salinity-gradient energy ***,we give a brief introduction to bioinspired nanochannel membranes(BNMs)with diverse structural dimensions,and nanofluidic channel membranes may lead to technological breakthroughs and thus act as an emerging platform for harvesting salinity-gradient ***,we discuss the

关键词： porous harvesting versatile

A dynamic panel data approach and HCW's method:Assessing the effect of China(Shanghai)Free Trade Zone on local GDP

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Journal of Management Science and Engineering 2021年第3期6卷 249-267页

作者： Jun Cai Kai Xin yahong zhou School of Management Huazhong University of Science and TechnologyWuhanHubei430074China School of Economics Shanghai UniversityShanghai200444China Shanghai University of Finance and Economics Shanghai200433China

We propose a simple-to-implement dynamic panel data method to evaluate the impacts of place-based *** idea is to exploit both the cross sectional dependence and the serial correlation within a panel and implement a semi difference-in-difference *** from the method by Hsiao et al.(2012),the proposed model is easy to implement statistical inferences and can incorporate multiple treated groups at different time *** use the proposed method to explore the effect of the Free Trade Zone(FTZ)policy implemented in Shanghai at the end of 2013 on local GDP growth rate and compare it with that from Hsiao et al.(2012).The empirical results show that the FTZ does have a positive effect on the local GDP growth rate and it adds 1:21:8 percent point to the growth rate of the GDP per capita for Shanghai in 2014 which is about one fourth to one third of the total GDP growth rate per *** effect largely comes from the growth of the tertiary *** results lend support to the duplication of FTZ policy to other cities and provinces in China.

关键词： Dynamic panel model Difference-in-Difference Free trade zone GDP growth Treatment effect

The Impact of Green Building Labels on the Price of Housing:Evidence from China

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Frontiers of Economics in China-Selected Publications from Chinese Universities 2018年第4期13卷 635-654页

作者： Fang Fang Xuesong Li Ximing Chen yahong zhou School of Public Economics and Administration Shanghai University of Finance and EconomicsShanghai 200433China School of Economics Shanghai University of Finance and EconomicsShanghai 200433China School of Finance Shanghai University of Finance and EconomicsShanghai 200433China

This paper focuses on the willingness to pay for green housing in China. First, we introduce green building related labels in China and briefly discuss the consumers’ incentives to buy this kind of building. Second, with the available transaction data in Shanghai, a hedonic regression model is applied to investigate whether or not a price premium in the residential market exists. Furthermore, we use the nonparametric matching model under a treatment framework to see the robustness of our results. The empirical result shows there exists a significant price premium in China. However, the premium does not increase with quality certification tiers. That may imply that homebuyers in China are not sensitive to the differences among green buildings although they are willing to pay a higher price for this newly emerging energy-saving building. And we also give the explanation why this has happened.

关键词： Green Building Evaluation Label (GBEL) hedonic model treatment effect matching model house price

环境规制与城市制造业转型升级——基于产业结构绿色转型和企业技术升级双视角分析

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系统工程理论与实践 2022年第6期42卷 1616-1631页

作者：杨岚周亚虹西南财经大学统计学院成都611130 上海财经大学经济学院上海200433

本文以“十一五”期间全国主要污染物排放总量控制计划作为准自然实验,利用工业企业数据库和《中国城市统计年鉴》的数据,分别构建了企业、行业和城市层面的数据样本,运用双重差分法,基于城市制造业产业结构绿色转型和企业技术升级两个... 详细信息

本文以“十一五”期间全国主要污染物排放总量控制计划作为准自然实验,利用工业企业数据库和《中国城市统计年鉴》的数据,分别构建了企业、行业和城市层面的数据样本,运用双重差分法,基于城市制造业产业结构绿色转型和企业技术升级两个角度,探究环境规制对城市制造业转型升级的影响,并进一步考察环境规制的具体作用渠道.研究发现:该环境规制政策显著推动了城市制造业转型升级,随着环境规制强度的增加,城市制造业产业清洁度和企业生产率相比政策实施前都得到显著提升.并且,短期内环境规制政策主要是通过调整生产性要素投入对制造业产业清洁度产生影响,尚未形成行业创新驱动.同时,企业技术升级主要依赖于政府补贴的增加,尚未观察到企业创新和资金筹措的变化.本研究对厘清环境规制政策效果,提升城市环境规制执行的内在激励,促进我国制造业高质量发展有一定的参考价值.

关键词：环境规制产业清洁度全要素生产率制造业转型升级双重差分法

Wireless electrical stimulation at the nanoscale interface induces tumor vascular normalization

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Bioactive Materials 2022年第12期7卷 399-408页

作者： Changhao Li Cairong Xiao Lizhen Zhan Zhekun Zhang Jun Xing Jinxia Zhai Zhengnan zhou Guoxin Tan Jinhua Piao yahong zhou Suijian Qi Zhengao Wang Peng Yu Chengyun Ning School of Material Science and Engineering National Engineering Research Center for Tissue Restoration and ReconstructionMetallic Materials Surface Functionalization Engineering Research Center of Guangdong ProvinceSouth China University of TechnologyGuangzhou510641China School of Food Science and Engineering South China University of TechnologyGuangzhou510641China CAS Key Laboratory of Bio-inspired Materials and Interfacial Science Technical Institute of Physics and ChemistryChinese Academy of ScienceBeijing100190China School of Chemical Engineering and Light Industry Guangdong University of TechnologyGuangzhou510006China China-Singapore International Joint Research Institute Guangzhou511365China

Pathological angiogenesis frequently occurs in tumor tissue, limiting the efficiency of chemotherapeutic drug delivery and accelerating tumor progression. However, traditional vascular normalization strategies are not fully effective and limited by the development of resistance. Herein, inspired by the intervention of endogenous bioelectricity in vessel formation, we propose a wireless electrical stimulation therapeutic strategy, capable of breaking bioelectric homeostasis within cells, to achieve tumor vascular normalization. Polarized barium titanate nanoparticles with high mechano-electrical conversion performance were developed, which could generate pulsed open-circuit voltage under low-intensity pulsed ultrasound. We demonstrated that wireless electrical stimulation significantly inhibited endothelial cell migration and differentiation in vitro. Interestingly, we found that the angiogenesis-related eNOS/NO pathway was inhibited, which could be attributed to the destruction of the intracellular calcium ion gradient by wireless electrical stimulation. In vivo tumor-bearing mouse model indicated that wireless electrical stimulation normalized tumor vasculature by optimizing vascular structure, enhancing blood perfusion, reducing vascular leakage, and restoring local oxygenation. Ultimately, the anti-tumor efficacy of combination treatment was 1.8 times that of the single chemotherapeutic drug doxorubicin group. This work provides a wireless electrical stimulation strategy based on the mechano-electrical conversion performance of piezoelectric nanoparticles, which is expected to achieve safe and effective clinical adjuvant treatment of malignant tumors.

关键词： Calcium distribution Mechano-electrical conversion Piezoelectric barium titanate Tumor vascular normalization Wireless electrical stimulation

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含时间因子的删失面板模型的估计与推断

系统工程理论与实践 2024年第9期44卷 3040-3048页

作者：忻恺周亚虹上海大学经济学院上海200444 上海财经大学经济学院上海200433

本文研究了随机相关下的含时间因子的删失面板数据的估计与推断问题.该模型允许了不可观测的个体效应对潜在结果变量有着时变的影响.在假设误差项是对称且相互独立的条件下,给出了模型中的斜率参数与时间因子的识别与估计.文中给出的估... 详细信息

本文研究了随机相关下的含时间因子的删失面板数据的估计与推断问题.该模型允许了不可观测的个体效应对潜在结果变量有着时变的影响.在假设误差项是对称且相互独立的条件下,给出了模型中的斜率参数与时间因子的识别与估计.文中给出的估计量是√N一致且渐近正态的.此外,文中提出的秩得分检验统计量无需对密度函数进行估计,在相对小的样本下也有着较好的表现.蒙特卡罗模拟和关于女性劳动时间的实证应用的结果验证了估计量的可行性.

关键词：时间因子随机相关模型中位数回归删失模型