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Induced magneto-conductivity in a two-nodeWeyl semimetal under Gaussian random disorder

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Chinese Physics B 2024年第9期33卷 566-574页

作者： Chuanxiong Xu Haoping Yu Mei Zhou Xuanting Ji department of applied Physics China Agricultural UniversityBeijing 100083China department of applied Mechanics China Agricultural UniversityBeijing 100083China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100049China

Measuring the magneto-conductivity induced from impurities may help determine the impurity distribution and reveal the structure of a Weyl semimetal *** verify this,we utilize the Gaussian random disorder to simulate charged impurities in a two-node Weyl semimetal model and investigate the impact of charged impurities on magneto-conductivity in Weyl *** first compute the longitudinal magnetic conductivity and find that it is positive and increases proportionally with the parameter governing the Gaussian distribution of charged impurities,suggesting the presence of negative longitudinal *** we consider both the intra-valley and inter-valley scattering processes to calculate the induced transverse magneto-conductivity in the *** findings indicate that both inter-valley and intravalley scattering processes play important roles in the transverse *** locations of Weyl nodes can also be determined by magneto-conductivity *** is possible if the magnetic field strength and the density of charged impurities are ***,the measurement of magnetic conductivity may reveal the distribution of charged impurities in a given sample once the locations of the Weyl nodes have been *** findings can aid in detecting the structure of a Weyl semimetal sample,enhancing comprehension of magnetotransport in Weyl semimetals and promoting the development of valley electronics.

关键词： Weyl semimetal inter-valley scattering magneto-conductivity

Tracking the change in Spanish greenhouse gas emissions through an LMDI decomposition model:A global and sectoral approach

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Journal of Environmental Sciences 2024年第5期139卷 114-122页

作者： Paula Fernández González María José Presno Manuel Landajo department of applied economics University of OviedoAuda del Cristos/n 33011 OviedoSpain

The reduction of GHG emissions to reverse the greenhouse effect is one of the main challenges in this *** this paper we pursue two ***,we analyze the evolution of GHG emissions in Spain in 2008–2018,at both the global and sectoral levels,with the variation in emissions decomposed into a set of determining ***,we propose several actions specifically oriented to more tightly controlling the level of *** results showed a remarkable reduction(18.44%)in GHG emissions,mainly due to the intensity effect,but also to the production-per-capita *** detected somewhat different patterns among the various sectors *** the intensity effect was the most influential one in the agricultural,transport,and others sectors,the production-per-capita effect was predominant in the case of *** carbonization effect was revealed as crucial in the commerce *** above findings highlight the importance of the energy efficiency measures taken in recent years in the Spanish economy,also pointing to the need to deepen those strategies and to propose new measures that entail greater efficiency in *** efforts in areas like innovation,R&D,diffusion of more eco-friendly technologies,and a greater use of greener energies all prove to be essential reduction actions to fight the greenhouse effect.

关键词： LMDI Decomposition Spain GHG emissions

Understanding the determinants of household cooking-fuel choice in sub-Saharan Africa:evidence from Nigeria

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Clean Energy 2024年第2期8卷 144-155页

作者： Raheem Olatunji Aminu Maxwell Adizor Dzudzor Funminiyi Peter Oyawole Samson Oluwaseyi Afolayan School of Agriculture Policy and DevelopmentUniversity of ReadingReadingUK department of agricultural economics and Farm Management Federal University of Agriculture AbeokutaOgun StateNigeria department of agricultural economics and Agribusiness University of GhanaAccraGhana

Overreliance on traditional cooking fuels by agricultural households poses a significant obstacle to achieving the United Nations Sustainable Development Goal 7 by 2030 in *** the emerging recognition of remittances as a crucial factor influencing cooking-fuel choices in the energy-transition literature,there is a paucity of studies examining this influence in *** data from 4400 agricultural households sourced from the fourth wave of the Nigerian Living Standard Measurement Survey data sets,this study examined the influence of remittances on cooking-fuel choices,among other factors in *** descriptive statistics and the multinomial logit regression model,the analysis reveals that traditional cooking fuels,including wood,crop residue and animal dung,continue to dominate the cooking-fuel *** empirical result of the multinomial logit model showed that households that receive remittances are more likely to use modern cooking ***,wealthier,more educated households with access to electricity are more likely to use modern and transitional cooking fuels than traditional cooking *** on the findings,the study suggests the incentivization of remittances into the country through the reduction in associated transaction costs and accelerated public infrastructural investment in affordable electricity and good road networks to connect rural areas to gas-supply networks to drive the transition to modern cooking ***,educational and awareness campaigns about the health risks associated with traditional cooking energy,particularly indoor air pollution,should be encouraged,especially in rural areas.

关键词： agricultural households cooking fuels energy ladder Nigeria remittance SDG 7

Are gender inclusiveness and rural transformation interlinked?The case of Bangladesh

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Journal of Integrative Agriculture 2024年第6期23卷 2112-2126页

作者： Maria Fay Rola-Rubzen Mohammad Jahangir Alam Jon Marx Sarmiento Ismat Ara Begum Al Amin Al Abbasi Subrata Saha UWA School of Agriculture and Environment The University of Western AustraliaPerth 6009Australia department of Agribusiness and Marketing Bangladesh Agricultural UniversityMymensingh-2202Bangladesh department of agricultural economics Bangladesh Agricultural UniversityMymensingh-2202Bangladesh

Gender inclusiveness is important in the rural transformation process of Bangladesh as rural women play key roles in both agricultural and non-agricultural *** inclusiveness also leads to gender *** empirically evaluate relationships between rural transformation and gender inclusiveness in *** consider three rural transformation indicators:high-value commodities’share in agricultural output values,non-farm employment’s share in rural labor employment,and non-agricultural GDP’s share in total *** capturing gender inclusiveness include the per capita rural income of males and females,ratio of investments into gender programs,female access to education,access to healthcare,employment participation,land ownership,and asset *** test the effect of the difference in per capita rural income of males and females and the ratio of their incomes and check for the robustness of the gender variables across different model *** 128 district-level observations from 32 districts of Bangladesh across four time periods(2000,2005,2010 and 2016),we use both ordinary least squares and fixed effects panel regression *** find that female land and asset ownership and access to education and healthcare are robust determinants of various stages of rural ***,our results suggest that improving women’s ownership of land and assets and investing in women’s education and healthcare will likely contribute to a more inclusive rural transformation.

关键词： rural transformation Bangladesh gender inclusiveness investments on women

ON DIVIDENDS AND GERBER-SHIU ANALYSIS WITH CONSTANT INTEREST AND A PERIODIC-THRESHOLD MIXED STRATEGY

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Acta Mathematica Scientia 2024年第6期44卷 2139-2164页

作者：刘章陈平 School of Computer and Information Engineering Jiangxi Agricultural University department of economics The University of Melbourne

In recent years,the research focus in insurance risk theory has shifted towards multi-type mixed dividend ***,the practical factors and constraints in financial market transactions,such as interest rates,tax rates,and transaction fees,inevitably impact these *** incorporating appropriate constraints,a multi-type mixed strategy can better simulate real-world *** the approach of Liu et al.[28],we examine a classical compound Poisson risk model that incorporates the constraints of constant interest rates and a periodic-threshold mixed dividend *** this model,the surplus process of insurance companies is influenced by several *** factors include constant interest rates,continuously distributed dividends within intervals(threshold dividend strategy),and dividends at discrete time points(periodic dividend strategy).We derive the piecewise integro-differential equations(IDEs) that describe the expected present value of dividends(EPVDs) until ruin time and the Gerber-Shiu expected discounted penalty ***,we provide explicit solutions to these IDEs using an alternative method based on the inverse Laplace transform combined with the Dickson-Hipp *** enables us to obtain explicit expressions for the dividend and Gerber-Shiu ***,we present examples to illustrate the application of our results.

关键词： 35B10 Cramér-Lundberg model EPVDs Gerber-Shiu function interest mixed dividend strategy

The impact of the Rural Minimum Living Standard Guarantee(Rural Dibao)Program on child nutrition outcomes

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Journal of Integrative Agriculture 2024年第2期23卷 444-456页

作者： Dian Chen Xiangming Fang Yu Chen Xiaodong Zheng Zhuo Chen Rodney B.W.Smith Academy of Global Food economics and Policy China Agricultural UniversityBeijing 100083China School of Public Health Georgia State UniversityAtlanta 30303USA School of economics Zhejiang Gongshang UniversityHangzhou 310018China College of Public Health University of GeorgiaAthens 30602USA department of applied economics University of MinnesotaSaint Paul 55108USA

The Rural Minimum Living Standard Guarantee(Rural Dibao)is an important unconditional cash transfer program to alleviate poverty in rural *** the importance of children’s nutrition in breaking poverty cycles,little is known about the impact of Rural Dibao on child nutrition *** China Family Panel Studies(CFPS),this paper examines the effects of Rural Dibao on child nutrition outcomes and investigates potential pathways and heterogeneous *** exploit propensity score matching and difference-in-differences techniques to evaluate the effects of the Rural Dibao program on child nutrition *** results suggest that Rural Dibao significantly impacts the nutrition outcomes of children up to 15 years of ***,our results suggest that Rural Dibao improves child height-to-age z-scores by 1.05 standard deviations and lowers the probability of stunting by 11.9 percentage *** analyses suggest that increased protein intake is the main pathway through which Rural Dibao participation contributes to better nutrition *** also find that the effect of the program is more pronounced among girls,children who are non-left-behind or live with highly educated mothers,and those from low-income families and poor *** findings suggest that Rural Dibao participation helps improve child nutrition outcomes through improving diet quality.

关键词： Rural Minimum Living Standard Guarantee nutrition height-to-age z-scores stunting rural China

Brent *** Texas Intermediate in the US petro derivatives price formation

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Petroleum Science 2024年第1期21卷 729-739页

作者： Alejandro Almeida Antonio A.Golpe Juan Manuel Martín-Alvarez Jose Carlos Vides Universidad Internacional de La Rioja Department of Quantitative Methods for Economics and BusinessLa RiojaSpain University of Huelva Department of Economics and Centro de Estudios Avanzados en FisicaMatematicas y Computacion and ICEIHuelvaSpain Complutense University of Madrid Department of Applied and Structural Economics and History and ICEIMadridSpain

In this paper,we apply the spatial panel model to explore the relationship between the dynamic of two types of crude oil prices(WTI and Brent crude oil)and their refined products over *** the turbulent months of 2011,when Cushing Oklahoma had reached capacity and the crude oil export ban removal in 2015 as breakpoints,we apply this method both in the full sample and the three resultant ***,results suggest our results show that both WTI and Brent display very similar behaviour with the refined ***,when attending to each regime,results derived from the first and third regimes are quite similar to the full sample ***,during the second regime,Brent crude oil became the benchmark in the petrol market,and it influenced the distillate ***,our model can let us determine the price-setters and price-followers in the price formation mechanism through refined *** results possess important considerations to policymakers and the market participants and the price formation.

关键词： Crude oil prices Spatial panel model Refined products Price formation

Sustainability level of the pearl lobster(Panulirus ornatus)aquaculture business using the systems of floating-net cage and fixed-net cage:A case study in South Sulawesi Province,Indonesia

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Aquaculture and Fisheries 2024年第5期9卷 851-859页

作者： Nimmi Zulbainarni Muhammad Hairul Haj Novindra School of Business Bogor Agricultural InstituteBogor16143Indonesia Tropical Marine economics Study Program Bogor Agricultural InstituteBogor16680Indonesia department of Resource economics and Environment Bogor Agricultural InstituteBogor16680Indonesia

Marine aquaculture is currently the fastest-growing seafood industry globally,offering a potential solution to overfishing problems,while enhancing food security and income *** Sulawesi,a province in Indonesia,is rich in aquaculture resources,one of which is *** two commonly used aquaculture systems are the floating-net cage(KJA)and fixed-net cage(KJD).The growing market demand and rising lobster prices pose a threat to resource sustainability due to *** is issue have to be addressed to achieve sustainable fishery *** is the primary focus on global fishery *** to the United Nations,sustainable development encompasses three dimensions:the economy,social and ***,sustainable fishery,particularly aquaculture,relies on obtaining significant benefits while minimizing environmental ***,this study aimed to analyze the sustainability level of the pearl lobster(Panulirus ornatus)aquaculture in South Sulawesi,based on the provided background *** study included a sample of 62 *** sample selection involved the use of the stratified sampling method,with 51 farmers from(KJA)and 11 farmers from(KJD).The sustainability analysis,conducted through assessment of based farmers’perceptions,served as the analytical *** findings revealed that pearl lobster(Panulirus ornatus)aquaculture has a medium level of *** Integrated Multi Tropic Aquaculture(IMTA)and Regional Integrated Multi Tropic Aquaculture(RIMTA)techniques is a recommended sustainability level.

关键词： Cage Sustainability Pearl Lobster South Sulawesi Province Indonesia

Climbing the Export Quality Ladder:Role of Human Capital

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China & World Economy 2024年第2期32卷 125-159页

作者： Xiaogang He Ruifeng Teng Dawei Feng School of applied economics Jiangxi University of Finance and EconomicsChina

This study assesses the effect of human capital expansion on China's export product *** employs the difference-in-differences(DID)framework based on a quasi-natural experiment investigating the 1999 higher education enrollment expansion as the exogenous policy *** empirical results confirm that human capital expansion appreciably improved the quality of China's export *** capital expansion promoted the transformation and upgrading of old products and the development of new products in term of intensive margin;it strengthened the endowment advantages of incumbent high-quality export enterprises while preventing low-quality enterprises from entering the market through price competition on the extensive *** prevented quality ***,the study reveals that the improvement effect driven by human capital came from both innovation-induced and managerial efficiency improvement channels and was more prominent for large or foreign-funded enterprises in the eastern *** findings highlight the role of human capital in China's remarkable export performance from an endogenous growth perspective.

关键词： endogenous growth export product higher education expansion human capital quality improvement