检索结果-南通市图书馆

在线全文

学校读者我要写书评

暂无评论

考虑投资者心理特征的模糊投资组合优化模型

控制与决策 2024年第4期39卷 1387-1395页

作者：杨兴雨陈锦桂刘伟龙张永广东工业大学管理学院广州510520

投资者在实际金融市场中的决策行为往往会受到主观心理认知的影响.考虑参照依赖、敏感性递减和损失厌恶等影响投资决策的心理特征,研究模糊环境下的投资组合选择问题.首先,假设资产的收益为梯形模糊数,依据前景理论中的价值函数,将组合... 详细信息

投资者在实际金融市场中的决策行为往往会受到主观心理认知的影响.考虑参照依赖、敏感性递减和损失厌恶等影响投资决策的心理特征,研究模糊环境下的投资组合选择问题.首先,假设资产的收益为梯形模糊数,依据前景理论中的价值函数,将组合收益转化为体现投资者心理特征的感知价值;然后,以感知价值的可能性均值最大化和可能性下半方差最小化为目标,建立考虑心理特征的模糊投资组合优化模型;接着,为了有效地求解模型,设计一个多种群遗传算法;最后,通过实例分析表明模型和算法的有效性.结果表明,与传统的遗传算法相比,所设计的多种群遗传算法可更有效地求解模型,考虑心理特征的模糊投资组合优化模型能够提升投资者的满意程度,可为实际的投资活动提供决策支持.

关键词：模糊投资组合心理特征前景理论价值函数感知价值多种群遗传算法

Everything is Primitive Accumulation?

在线全文

学校读者我要写书评

暂无评论

Fudan Journal of the Humanities and Social Sciences 2024年第2期17卷 337-360页

作者： David S.Pena Joel Wendland-liu Palm Beach State College Palm Beach GardensFLUSA Grand Valley State University AllendaleMIUSA

This paper explores the Marxist concept of primitive accumulation and its relationship to capitalist development. Primitive accumulation occurs as a historical process before the complete emergence of capitalism as the dominant mode of production. Primitive accumulation is distinguished from other forms of exploitation employed by capitalist societies to spread capitalism into non-capitalist regions. An exploration of different interpretations of primitive accumulation within Marxist theory highlights the transition from primary accumulation to capitalist accumulation in specific contexts. This paper provides a comprehensive overview of the multifaceted nature of primitive accumulation and its significance in the development of capitalism. It argues that many uses of primitive accumulation in the present context are erroneous.

关键词： Marxism Primitive accumulation Origins of capitalism Political economy

绿色财政示范政策对绿色技术创新的影响机制——基于多重压力约束视角

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

自然资源学报 2024年第9期39卷 2102-2120页

作者：刘炳荣孙志红付奎刘锦华石河子大学经济与管理学院石河子832003 石河子大学兵团金融发展研究中心石河子832003 湖南大学金融与统计学院长沙410006

以项目示范撬动地方配套和企业资金投入,汇聚形成地方环境治理合力,是中国财政环境治理的特色创新。以节能减排财政政策综合示范城市为准自然试验,采用双重差分法考察绿色财政示范政策的绿色创新效应及多重压力约束机制。研究发现:(1)... 详细信息

以项目示范撬动地方配套和企业资金投入,汇聚形成地方环境治理合力,是中国财政环境治理的特色创新。以节能减排财政政策综合示范城市为准自然试验,采用双重差分法考察绿色财政示范政策的绿色创新效应及多重压力约束机制。研究发现:(1)示范城市建设显著促进了城市绿色技术创新,呈现出绿色财政示范政策的“撬动”作用;(2)绿色财政示范政策能够优化地方政府环境治理的激励行为,通过提高地方政府环境重视程度、增加地方配套环保财政资金和强化环境规制力度等机制促进绿色技术创新;(3)从地方政府面临的多重压力约束来看,财政压力、官员晋升考核压力弱化了绿色财政示范政策的激励效果,公众诉求压力则有助于强化政策效果;(4)示范政策对财政透明度较高地区及非资源型和老工业基地城市的绿色创新激励效应更强。研究结果对新时期优化绿色财政示范政策,推动构建与地方财政兼容的绿色财政协调机制,助推实现“双碳”目标与高质量发展具有一定的借鉴意义。

关键词：绿色财政示范政策节能减排综合财政示范城市绿色技术创新多重压力约束

Superwetting Ag/α-Fe_(2)O_(3) anchored mesh with enhanced photocatalytic and antibacterial activities for efficient water purification

在线全文

学校读者我要写书评

暂无评论

Green Energy & Environment 2024年第1期9卷 89-103页

作者： Jiakai Li Changpeng Lv Jiajia Song Xiaoling Zhang Xizhen Huang Yingzhuo Ma Haijie Cao Na liu Department of Chemistry Tsinghua UniversityBeijing100084China Anhui Provincial Engineering Laboratory of Silicon-based Materials Engineering Technology Research Center of Silicon-based Materials(Anhui)School of Material and Chemical EngineeringBengbu UniversityBengbu233030China Institute of Materials for Energy and Environment College of Materials Science and EngineeringQingdao UniversityQingdao266071China

Superwetting materials have drawn unprecedented attention in the treatment of oily wastewater due to their preferable anti-fouling property and selective oil/water ***,it is still a challenge to fabricate multifunctional and environmentally friendly materials,which can be stably applied to purify the actual complicated ***,a Ag/Ag/α-Fe_(2)O_(3) heterostructure anchored copper mesh was intentionally synthesized using a facile two-step hydrothermal *** resultant mesh with superhydrophilicity and underwater superoleophobicity was capable of separating various oil/water mixtures with superior separation efﬁciency and high permeationﬂux driven by ***ﬁting from the joint effects of the smaller band gap of Ag/α-Fe_(2)O_(3) heterojunction,inherent antibacterial capacity of Ag/α-Fe_(2)O_(3) and Ag nanoparticles,favorable conductive substrate,as well as the hierarchical structure with superwettability,such mesh presented remarkably enhanced degradation capability toward organic dyes under visible light irradiation and antibacterial activity against both Escherichia coli(***)and Staphylococcus aureus(***)compared with the pure Ag/α-Fe_(2)O_(3) coated ***,the mesh exhibited bifunctional water puriﬁcation performance,in which organic dyes were eliminated simultaneously from water during oil/water separation in oneﬁltration *** importantly,this mesh behaved exceptional chemical resistance,mechanical stability and long-term ***,this material with multifunctional integration may hold promising potential for steady water puriﬁcation in practice.

关键词： Superwetting Ag/α-Fe_(2)O_(3)heterostructure Enhanced photocatalytic and antibacterial activities Water purification Long-term reusability

Energy Absorption by 3D-Printed Mesh Structures with a Negative Poisson’s Ratio

在线全文

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English Letters) 2024年第1期37卷 205-212页

作者： Wenyu Li Weiming Yang Mingze Li Xiang Zhang Ping Zhang Yucheng Zhao Peijian Chen Haishun liu School of Mechanics and Civil Engineering China University of Mining and TechnologyXuzhou221116China School of Materials Sciences and Physics China University of Mining and TechnologyXuzhou221116China

A negative Poisson's ratio(NPR)structure represents optimal impact-resistance with applications in various fields,including the crash box in vehicles,which absorbs impact kinetic *** crash box is designed to deform in response to impact,increasing local structural density,which enhances impact resistance *** studies have only focused on the NPR effect in the plane dimension at low-speed *** studies have considered high-speed impact loads on three-dimensional NPR *** have developed two types of AlSi10Mg alloy energy-absorbing structures with NPR using three-dimensional printing technology,and have compared our systems with a conventional hexagonal mesh *** testing involved split-Hopkinson pressure bar measurements,which showed good agreement with dynamic numerical *** subjected to an impact load,the NPR structure exhibited better impact resistance and energy absorption compared with the positive Poisson's ratio *** proposed dual-layer hexagonal structure ensures an NPR effect while exhibiting higher strength and improved stability relative to the conventional concave hexagon structure.

关键词： Negative Poisson’s ratio Energy absorption 3D printing Split-Hopkinson pressure bar Numerical simulation

Chlorfenapyr poisoning:mechanisms,clinical presentations,and treatment strategies

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Emergency Medicine 2024年第3期15卷 214-219页

作者： Ji Cheng Yulu Chen Weidong Wang Xueqi Zhu Zhenluo Jiang Peng liu Liwen Du Emergency Department Ningbo No.2 HospitalNingbo 315010China

BACKGROUND:Chlorfenapyr is used to kill insects that are resistant to organophosphorus *** poisoning has a high mortality rate and is difficult to *** article aims to review the mechanisms,clinical presentations,and treatment strategies for chlorfenapyr *** RESOURCES:We conducted a review of the literature using PubMed,Web of Science,and SpringerLink from their beginnings to the end of October *** inclusion criteria were systematic reviews,clinical guidelines,retrospective studies,and case reports on chlorfenapyr poisoning that focused on its mechanisms,clinical presentations,and treatment *** references in the included studies were also examined to identify additional ***:We included 57 studies in this *** can be degraded into tralopyril,which is more toxic and reduces energy production by inhibiting the conversion of adenosine diphosphate to adenosine *** fever and altered mental status are characteristic clinical presentations of chlorfenapyr *** it occurs,respiratory failure occurs immediately,ultimately leading to cardiac arrest and *** poisoning is diflcult to treat,and there is no specific ***:Chlorfenapyr is a new pyrrole *** it has been identified as a moderately toxic pesticide by the World Health Organization(WHO),the mortality rate of poisoned patients is extremely *** is no specific antidote for chlorfenapyr ***,based on the literature review,future efforts to explore rapid and effective detoxification methods,reconstitute intracellular oxidative phosphorylation couplings,identify early biomarkers of chlorfenapyr poisoning,and block the conversion of chlorfenapyr to tralopyril may be helpful for emergency physicians in the diagnosis and treatment of this disease.

关键词： Chlorfenapyr poisoning Mechanism Clinical presentation Treatment

Adsorption and activation of peroxymonosulfate on BiOCl for carbamazepine degradation: The role of piezoelectric effect

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2024年第10期35卷 447-450页

作者： Cunjun Li Wencong liu Xianlei Chen Liang Li Shenyu Lan Mingshan Zhu Zhoushan Institute of Calibration and Testing for Quality and Technology Supervision School of Environment Jinan University Department of Environmental Science and Engineering Xi' an Jiaotong University

The adsorption of peroxymonosulfate（PMS） is crucial for PMS activation in the heterogeneous advanced oxidation processes. However, the investigation of PMS adsorption on the piezocatalysts still remains insufficient. In this work, bismuth oxychloride（BiO Cl） nanosheets were prepared as the piezocatalysts for PMS activation under ultrasonic vibration to remove carbamazepine（CBZ） in aqueous solutions. Up to92.5% of CBZ was degraded for 40 min in Bi OCl piezo-activated PMS system with the reaction rate constant of 0.0741 min-1, being 1.63 times that of the sum of BiOCl piezocatalysis, BiOCl-activated PMS, and vibration-activated PMS. PMS adsorption on the surface of BiOCl was specifically studied by comparing the microscopic structure change of the fresh and used Bi OCl. The results suggested that the piezoelectric field of Bi OCl was able to promote the tight adsorption of PMS on the surface, thus facilitating the fast activation of PMS through electrons transfer to produce reactive species(HO·, SO4·-, O2·-,1O2). This work presents an in-depth understanding for the role of piezoelectric effect on the adsorption and activation of PMS.

关键词： BiOCl piezoelectricity Carbamazepine degradation Electron transfer Peroxymonosulfate activation Peroxymonosulfate adsorption

Natural evidence of coronaviral 2′-O-methyltransferase activity affecting viral pathogenesis via improved substrate RNA binding

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Signal Transduction and Targeted Therapy 2024年第6期9卷 2819-2834页

作者： Jikai Deng Shimin Yang Yingjian Li Xue Tan Jiejie liu Yanying Yu Qiang Ding Chengpeng Fan Hongyun Wang Xianyin Chen Qianyun liu Xiao Guo Feiyu Gong Li Zhou Yu Chen State Key Laboratory of Virology RNA InstituteCollege of Life Sciences and Frontier Science Center for Immunology and MetabolismWuhan UniversityWuhanChina School of Medicine Tsinghua UniversityBeijingChina School of Basic Medical Sciences Wuhan UniversityWuhanChina Animal Bio-Safety Level Ⅲ Laboratory/Institute for Vaccine Research Wuhan University School of MedicineWuhanChina

Previous studies through targeted mutagenesis of K-D-K-E motif have demonstrated that 2′-O-MTase activity is essential for efficient viral replication and immune ***,the K-D-K-E catalytic motif of 2′-O-MTase is highly conserved across numerous viruses,including flaviviruses,vaccinia viruses,coronaviruses,and extends even to ***,we observed a stronger 2′-O-MTase activity in SARS-CoV-2 compared to SARS-CoV,despite the presence of a consistently active catalytic *** further identified critical residues(Leu-36,Asn-138 and Ile-153)which served as determinants of discrepancy in 2′-O-MTase activity between SARS-CoV-2 and *** residues significantly enhanced the RNA binding affinity of 2′-O-MTase and boosted its versatility toward RNA *** interest,a triple substitution(Leu^(36)→Ile^(36),Asn^(138)→His^(138),Ile^(153)→Leu^(153),from SARS-CoV-2 to SARS-CoV)within nsp16 resulted in a proportional reduction in viral 2′-O-methylation and impaired viral ***,it led to a significant upregulation of type I interferon(IFN-I)and proinflammatory cytokines both in vitro and vivo,relying on the cooperative sensing of melanoma differentiation-associated protein 5(MDA5)and laboratory of genetics and physiology 2(LGP2).In conclusion,our findings demonstrated that alterations in residues other than K-D-K-E of 2′-O-MTase may affect viral replication and subsequently influence *** changes in nsp16 residues is crucial as it may aid in identifying and assessing future alteration in viral pathogenicity resulting from natural mutations occurring in nsp16.

关键词： pathogenesis impaired alterations

Vision Transformers with Hierarchical Attention

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Machine Intelligence Research 2024年第4期21卷 670-683页

作者： Yun liu Yu-Huan Wu Guolei Sun Le Zhang Ajad Chhatkuli Luc Van Gool Institute for Infocomm Research(I2R) A*STARSingapore 138632Singapore Institute of High Performance Computing(IHPC) A*STARSingapore 138632Singapore Computer Vision Lab ETH ZürichZürich 8092Switzerland School of Information and Communication Engineering University of Electronic Science and Technology of China(UESTC)Chengdu 611731China

This paper tackles the high computational/space complexity associated with multi-head self-attention(MHSA)in vanilla vision *** this end,we propose hierarchical MHSA(H-MHSA),a novel approach that computes self-attention in a hierarchical ***,we first divide the input image into patches as commonly done,and each patch is viewed as a ***,the proposed H-MHSA learns token relationships within local patches,serving as local relationship ***,the small patches are merged into larger ones,and H-MHSA models the global dependencies for the small number of the merged *** last,the local and global attentive features are aggregated to obtain features with powerful representation *** we only calculate attention for a limited number of tokens at each step,the computational load is reduced ***,H-MHSA can efficiently model global relationships among tokens without sacrificing fine-grained *** the H-MHSA module incorporated,we build a family of hierarchical-attention-based transformer networks,namely *** demonstrate the superiority of HAT-Net in scene understanding,we conduct extensive experiments on fundamental vision tasks,including image classification,semantic segmentation,object detection and instance ***,HAT-Net provides a new perspective for vision *** and pretrained models are available at https://***/yun-liu/HAT-Net.

关键词： Vision transformer hierarchical attention global attention local attention scene understanding.