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Risk preferences and the low-carbon agricultural technology adoption:Evidence from rice production in China

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Journal of Integrative Agriculture 2023年第8期22卷 2577-2590页

作者： MAO Hui quan yu-rong FU Yong Northwest Institute of Historical Environment and Socio-Economic Development Shaanxi Normal UniversityXi'an 710119P.R.China College of Economics and Management Nanjing Agricultural UniversityNanjing 210095P.R.China

Climate change which is mainly caused by carbon emissions is a global problem affecting the economic development and well-being of human ***-carbon agriculture is of particular significance in slowing down global warming and reaching the goal of“carbon peak and carbon neutrality”.Therefore,taking straw incorporation as an example,this paper aims to investigate the impact of risk preferences on farmers’low-carbon agricultural technology(LCAT)*** on a two-phase micro-survey data of 1038 rice farmers in Jiangsu,Jiangxi,and Hunan provinces,this paper uses experimental economics methods to measure farmers’risk aversion and loss aversion to obtain the real risk preferences information of the *** also explore the data to examine the actual LCAT adoption behavior of *** results revealed that both risk aversion and loss aversion significantly inhibit farmers’LCAT adoption:more risk-averse or more loss-averse farmers are less likely to adopt *** is further found that crop insurance,farm scale and governmental regulations can alleviate the negative impact of risk aversion and loss aversion on farmers’LCAT ***,we propose that local governments need to promote low-carbon agricultural development by propagating the benefits of LCAT,extending crop insurance,promoting appropriate scale operations,and strengthening governmental regulations to promote farmers’LCAT adoption.

关键词： risk preferences crop insurance farm scale governmental regulations low-carbon agricultural technology

Covering α-Fe2O3 protection layer on the surface of p-Si micropillar array for enhanced photoelectrochemical performance

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Frontiers of Environmental Science & Engineering 2017年第6期11卷 119-127页

作者： Jing Gu Hongtao yu Xie quan Shuo Chen Key Laboratory of Industrial Ecology and Environmental Engineering (Ministry of Education) School of Environmental Science and Technology Dalian University of Technology Dalian 116024 China

The spontaneous oxidation process of pristine silicon （Si） limits its application as photocatalyst or electrode in aqueous solution or moist air. Covering a protection layer on Si surface is an effective approach to overcome this disadvantage. In this paper, α-Fe2O3 is demonstrated to be an excellent alternative as a protection material, α-Fe2O3 layer was deposited around each p-type Si micropillar （SiMP） in well-ordered array by chemical bath ＂deposition ＂method. The diameter of SiMP was 3 μm and the thickness of α-Fe2O3 layer was about 20 nm. The photoeletrochemical stability of SiMP/α-Fe2O3 was proved by 10 circles cyclic voltammetr7 testing. Compared with SiMP, its optical absorption and photocurrent density improved 2 times and 4 times, respectively, and its onset potential for hydrogen evolution moved positively about 0.4 V. These improved performances could be ascribed to the enhanced photogenemted-charge-separation efficiency deriving from built-in electric field at the interface between Si and α-Fe2O3. The above results show an effective strategy to utilize Si material as photocatalyst or electrode in aqueous solution or moist air.

关键词： Si α-Fe2O3 Photoelectrochemistry Photogenemted charge separation

Investigating the neutron star physics through observations of several young pulsars in the dipole-field re-emergence scenario

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Science China(Physics,Mechanics & Astronomy) 2024年第12期67卷 197-208页

作者： yu-Long Yan quan Cheng Xiao-Ping Zheng Institute of Astrophysics Central China Normal UniversityWuhan430079China Department of Astronomy Huazhong University of Science and TechnologyWuhan430074China

The observed timing data,magnetic tilt angle χ,and age of young pulsars could be used to probe some important issues about neutron star(NS) physics,e.g.,the NS internal magnetic field configuration,and the number of precession cycles ξ.Both quantities are critical in studying the continuous gravitational wave emission from pulsars,and the latter generally characterizes the mutual interactions between superfluid neutrons and other particles in the NS *** timing behavior of pulsars can be influenced by the dipole field evolution,which instead of decaying,may increase with *** increase in the dipole field may result from the re-emergence of the initial dipole field B_(d,i)that was buried into the NS interior shortly after the birth of the *** this work,the field re-emergence scenario ξ and the internal field configuration of several young pulsars,as well as their B_(d,i) are investigated by assuming typical accreted masses ?***,since the Crab pulsar has an exactly known age and its tilt angle change rate can be inferred from observations,we can set stringent constraints on its ξ,B_(d,i),and ?*** for other young pulsars without exactly known ages and tilt angle change rates,these quantities cannot be accurately determined,we find that their ξ are generally within ~10~4-10~6,and some of them probably have magnetar-strength B_(d,i).Our work could be important for investigating the transient emissions associated with NSs,the origin of strong magnetic fields of NSs,pulsar population,continuous gravitational wave emission from pulsars,and accretion under extreme conditions in principle.

关键词： pulsar neutron star magnetic field

Single link tracking scheme based on UWB localization

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Journal of Systems Engineering and Electronics 2009年第6期20卷 1207-1212页

作者： Xiao Zhu Xiong Hailiang yu quan Yi Kechu State Key Lab. of Integrated Service Networks Xidian Univ. Xi'an 710071 P. R. China School of Electronic Science and Engineering National Univ. of Defense Technology Changsha 410073 P. R. China Inst. of China Electronics Equipment System Engineering Corporation Beijing 100039 P. R. China

To investigate the low-complex and high-precise tracking method, a novel single link tracking scheme based on UWB localization is proposed. Two antenna arrays are settled at the fixed station （FS） to receive the UWB signal from mobile terminal （MT）, one FS is enough for the proposed scheme to track the MT. The UWB multipath detection algorithm for time difference of arrival （TDOA） estimation is presented and TDOA is thus adopted to estimate angle of arrival （AOA）, avoiding the synchronization and complicated beamforming for AOA. The impacts of localization errors, concluding multipath and non-line-of-sight （NLOS） errors are simulated for the proposed track scheme. It is demonstrated that the simulation curve can match the real target moving, and the feasibility of the proposed scheme is proved.

关键词： ultra-wide band localization single-link tracking angle of arrival estimation.

Thermal Growth and Nanomagnetism of the Quasi-one Dimensional Iron Oxide

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Journal of Materials Science & Technology 2011年第11期27卷 985-990页

作者： Minglong zhong zhongwu Liu Xichun zhong Hongya yu Dechang Zeng School of Materials Science and Engineering South China University of Technology Guangzhou 510640 China

Quasi-one dimensional iron oxide nanowires with flat needle shape were synthesized on the iron powders by a rather simple catalyst-free thermal oxidation process in ambient atmosphere. The characterization by field emission scanning electron microscopy （FE-SEM）, X-ray photoelectron spectroscopy （XPS）, X-ray diffraction （XRD）, Raman and high-resolution transmission electron microscopy （HRTEM） revealed that these nanos- tructures are single crystalline α-Fe2O3. The various dimensions with 40-170 nm in width and 1-8 μm in length were obtained by tuning the growth temperature from 280 to 480℃. A surface diffusion mechanism was proposed to account for the growth of quasi-one dimensional nanostructure. The typical α-Fe203 nanowires synthesized at 430℃ had a reduced Morin temperature TM of 131 K in comparison with their bulk counterpart. The coercivitis Hc of these nanowires are 321 and 65 Oe at 5 and 300 K, respectively. The temperature of synthesis also has important effects on the magnetic properties of these nanowires.

关键词： Thermal growth One-dimensional nanostructures Iron oxide Magnetic materials

Adaptive ant-based routing in wireless sensor networks using Energy~* Delay metrics

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2008年第4期9卷 531-538页

作者： Yao-feng WEN yu-quan CHEN Min PAN State Specialized Laboratory of Biomedical Sensors Zhejiang University Hangzhou 310027 China

To find the optimal routing is always an important topic in wireless sensor networks (WSNs). Considering a WSN where the nodes have limited energy, we propose a novel Energy*Delay model based on ant algorithms ("E&D ANTS" for short) to minimize the time delay in transferring a fixed number of data packets in an energy-constrained manner in one round. Our goal is not only to maximize the lifetime of the network but also to provide real-time data transmission services. However, because of the tradeoff of energy and delay in wireless network systems, the reinforcement learning (RL) algorithm is introduced to train the model. In this survey, the paradigm of E&D ANTS is explicated and compared to other ant-based routing algorithms like AntNet and AntChain about the issues of routing information, routing overhead and adaptation. Simulation results show that our method performs about seven times better than AntNet and also outperforms AntChain by more than 150% in terms of energy cost and delay per round.

关键词： Ant colony optimization (ACO) Pheromones Power consumption Wireless sensor networks (WSNs)

Properties of the Collision Efficiency of Nanoparticles in Brownian Coagulation

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Chinese Physics Letters 2011年第1期28卷 130-133页

作者： WANG yu-Ming LIN Jian-zhong CHEN zhong-Li Institute of Fluid Mechanics China Jiliang University Hangzhou 310018 Department of Mechanics Zhejiang University Hangzhou 310027

The collision efficiency of nanoparticles with diameters from 100nm to 750nm in the Brownian coagulation is studied by building and solving＂ numerically the equations of particle collision in the presence of the van der Waals force, the elastic deformation force, the Stokes resistance, the lubrication force and the electrostatic force. The results show that the collision efficiency decreases overall with the increasing- particle diameter. It is found that there exists an abrupt increase in the collision efficiency when the particle diameter is equals to 550nm. Finally a new expression for the collision efficiency is presented.

关键词： Condensed matter: structural, mechanical & thermal Nanoscale science and low-D systems

Interior non-uniformity of acoustically excited oscillating gas bubbles

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Journal of Hydrodynamics 2019年第4期31卷 725-732页

作者： yu-ning Zhang Xiao-fei Li zhong-yu Guo Key Laboratory of Condition Monitoring and Control for Power Plant Equipment (Ministry of Education) School of Energy Power and Mechanical Engineering North China Electric Power University Beijing 102206 China Key Labor at oiy of Fluid and Power Machinery Ministry of Education Xihua IJnivarsily Chengdu 610039 China College of Mechanical and Transportation Engineering China University of Petroleum-Beijing Beijing 102249 China Beijing Key Laboratory of Process Fluid Filtration and Separation China University of Petroleum-Beijing Beijing 102249 China

In the present paper, the interior non-uniformity of oscillating gas bubbles in liquids under an acoustic field is theoretically investigated, as well as the temperature non-uniformity in the surrounding liquid. The pressure, the density and the temperature inside the gas bubbles are quantitatively predicted for a wide range of bubble Mach numbers. It is shown that the bubble interior non-uniformity increases significantly with the increase of the bubble Mach number. In the case of a large Mach number, the values of aforementioned paramount parameters at the bubble center are significantly larger than those at the bubble interface. Except for a very thin layer close to the bubble interface, the effects of the temperature non-uniformity in the bulk liquid could be safely ignored.

关键词： Cavitation gas bubbles acoustic field radial oscillation non-uniformity Mach number

Tuning Surface Molecular Design of Porous Carbon for Blue Energy Harvesting

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Research 2024年第1期2023卷 651-662页

作者： Jian yu zhong-Lin Wang Tianwei Ma Department of Civil and Environmental Engineering University of Hawaii at MānoaHonoluluHI 96822USA Beijing Institute of Nanoenergy and Nanosystems Chinese Academy of SciencesBeijing 101400China College of Engineering Texas A&M University-Corpus ChristiCorpus ChristiTX 78412USA

Capacitive mixing is a promising blue energy technology due to its membrane-free electricity generation and long electrode life ***,because of limited performance,existing systems do not lend themselves to practical *** it is a crucial factor directly influencing electrode behavior,surface chemistry has largely been overlooked in capacitive ***,we show that manipulating surface functionalization alone can tune the responses of electrodes to produce a high voltage rise without altering the pore structure of the *** findings reveal that the spontaneous electrode potential of a surface-modified carbon electrode shifts negatively proportional to the surface charge due to the surface groups,which explains why and how manipulating the surface chemistry can improve the power generation capacity.

关键词： electrode Porous mixing