检索结果-南通市图书馆

Journal of Landscape Research 2017年第5期9卷 106-110页

作者： fan xi ZHOU Bo College of Architecture & Environment Sichuan University

The core of"Long Forest"belief of the Dai nationality is to protect natural forests and forests for conservation of water supply as the home of ancestral gods of the nation and to maintain the ecological balance by means of"Long Forest"worship,"Long Forest"taboo,the traditional customary law,and village regulation and non-governmental *** paper takes Manjingchengzi Village in xishuangbanna as an example to analyze the distribution of forest land in different periods over the past 60 years and explore the role of"Long Forest"belief in the conservation of local forest resources in a view to providing a frame of reference for regional ecological environment protection.

关键词： The Dai nationality "Long forest" Conservation of forest resources

STUDY ON FINITE ELEMENT METHOD OF THE EXTRUDATE SWELL PROBLEM(Ⅱ)MAXWELL FLUID AND THE STREAMLINE ELEMENT SCHEME

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Hydrodynamics 1990年第3期2卷 12-21页

作者： fan Yu-ren fan xi-jun Lu Yong-xiang Zhejiang University,Hangzhou 310027,P.R.China

An important improvement on the streamline element method proposed recently by Luo-Tanner is put forward in this paper,making the method more suitable for handling differential-type constitutive equations and flow sin- *** of integrating the constitutive equations along the streamlines forming element boundaries,one could integrate them along the streamlines passing through the Gauss points of the *** this way the diffi- culty of discontinuous velocity gradients on the element boundaries is circumvented and the stress singularity at the exit point is ***,the amount of computation is considerably *** is found,by testing with the extrudate swell problem of the Maxwell fluid,that more strict enforcement of the incompressibility constraint by adopting a discontinuous-pressure scheme,discussed in the part I of this paper,allows one to obtain solutions of better quality and for higher Weissenberg numbers.

关键词： MAXWELL FLUID AND THE STREAMLINE ELEMENT SCHEME STUDY ON FINITE ELEMENT METHOD OF THE EXTRUDATE SWELL PROBLEM 一雪 body Maxwell

Social Promotion Mechanism under the Dai People’s Traditional Worship of“Dragon Forest”

在线全文

学校读者我要写书评

暂无评论

Journal of Landscape Research 2021年第1期13卷 91-95页

作者： fan xi XU xiao School of Urban and Environment Yunnan University of Finance and EconomicsKunmingYunnan 650221China

“Dragon Forest”culture has a long history,and it is the oldest and most primitive traditional culture of the Dai *** the holy forest of the Dai Nationality,“Dragon Forest”is the resting place for the souls of the“Meng God(tribal ancestor)”and“Zhai God(clan ancestor)”of the Dai *** people not only respect and worship“Dragon Forest”,but also set up a temple in“Dragon Forest”and hold sacrificial activities regularly,to pray for health and happiness from their ancestors.“Dragon Forest”is the combination of multiple factors,and has been continuously protected by worship and taboo for thousands of *** combines closely the natural system,belief system and social culture system,becomes a place that supports people’s ideas,values and spirits,and solidifi es into a structural force in the social structure,which plays a certain role in promoting the social mechanism of local village community.

关键词： Dai Nationality “Dragon Forest”worship Social mechanism

A Change in Rural Economy

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

China Today 2005年第6期54卷 76-77页

作者： YI fan & xi WEN

AGRICULTURE in Guangxi Zhuang Autonomous Region has become a profitable industry.

关键词：农村农业经济农业产业化农业科技农业收入

陕西省眉县猕猴桃园土壤碳氮磷生态化学计量学特征

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

干旱地区农业研究 2017年第4期35卷 33-38页

作者：范拴喜宝鸡文理学院陕西省灾害监测与机理模拟重点实验室陕西宝鸡721013

以眉县猕猴桃园土壤为研究对象,对土壤pH值、含水率、有机碳(SOC)、总氮(TN)、总磷(TP)的分布及其生态化学计量学特征进行研究。结果表明:研究区域猕猴桃园土壤含水率、pH值、SOC、TN和TP含量均存在显著性差异,分别处于1.12%~3.46%、7.1... 详细信息

以眉县猕猴桃园土壤为研究对象,对土壤pH值、含水率、有机碳(SOC)、总氮(TN)、总磷(TP)的分布及其生态化学计量学特征进行研究。结果表明:研究区域猕猴桃园土壤含水率、pH值、SOC、TN和TP含量均存在显著性差异,分别处于1.12%~3.46%、7.12~8.40、4.22~13.90 g·kg^(-1)、0.77~1.84 g·kg^(-1)和0.73~2.45 g·kg^(-1)之间,均值分别为2.73%、7.83、7.66 g·kg^(-1)、1.20 g·kg^(-1)和1.40 g·kg^(-1),其表现C、N元素相对匮乏,而P元素相对丰富;其次,不同区域及不同品种园区土壤中C、N和P的生态化学计量学特征均存在显著性差异,C/N、C/P和N/P的变异系数分别为28.30%、35.71%和21.15%,变化范围分别为3.06~11.99、2.68~10.90和0.48~1.41,均值分别为6.57、5.91和0.90,均低于全国平均水平;相关分析表明,在0.05水平上,pH值与C/P呈显著正相关性;在0.01水平上,pH值与TN、pH值与TP、TN与C/N、TN与C/P、TP与C/N、TP与C/P、TP与N/P呈显著的负相关性,pH值与C/N、SOC与C/N、SOC与C/P、TN与TP、C/N与C/P及C/P与N/P呈显著正相关性。

关键词：猕猴桃园土壤 C N P 生态化学计量学特征

在线全文

学校读者我要写书评

暂无评论

基于分段电力合同的发电商优化合同电量

中国电机工程学报 2006年第8期26卷 12-17页

作者：张显王锡凡西安交通大学电气工程学院电力系陕西省西安市710049

分段电力合同是一种新型的电力双边合同,电力双边合同的分段交易能够充分体现不同电力段的价值,从而有效地提高市场效率。文中研究发电商面对分段电力合同的最优合同电量问题。考虑到发电商对市场风险的不同偏好,建立了发电商通过分段... 详细信息

分段电力合同是一种新型的电力双边合同,电力双边合同的分段交易能够充分体现不同电力段的价值,从而有效地提高市场效率。文中研究发电商面对分段电力合同的最优合同电量问题。考虑到发电商对市场风险的不同偏好,建立了发电商通过分段电力合同和日前竞价市场交易电能的效用函数模型,并以最大化效用函数作为发电商分段合同电量优化的目标。该优化问题是一个2层优化的NP-hard问题,并有复杂的机组运行约束,因此采用2层优化的遗传算法(GABBA)求解该问题。以某实际电厂为例,分析了GABBA算法特性以及分段电力合同中各段价格对各段优化合同电量的影响,并比较了基于普通电力合同和分段电力合同的发电商最大期望效用,说明了电力分段交易的必要性。文中建立的发电商优化合同电量模型及其求解算法具有通用性,可为发电商的双边合同交易提供决策依据。

关键词：电力市场分段电力合同日前市场电能分配效用函数 2层优化的遗传算法

在线全文

学校读者我要写书评

暂无评论

电力金融市场综述

电力系统自动化 2005年第20期29卷 1-9,19页

作者：张显王锡凡西安交通大学电气工程学院陕西省西安市710049

电力金融市场是电力现货市场发展的必然产物,它有利于发现电力真实的价格,促进电力市场公平竞争;并能为市场交易者提供风险管理工具,抑止现货电价飞升,有利于电力市场的稳定。电力金融市场的研究对于设计高效、合理的中国电力市场框架... 详细信息

电力金融市场是电力现货市场发展的必然产物,它有利于发现电力真实的价格,促进电力市场公平竞争;并能为市场交易者提供风险管理工具,抑止现货电价飞升,有利于电力市场的稳定。电力金融市场的研究对于设计高效、合理的中国电力市场框架和电力交易机制有着重要的参考价值。文中在介绍各国电力金融市场的基础上对电力金融产品进行归类研究,包括电力期货和电力期权的分类。着重论述了电力金融市场的2个关键问题:电力期货的套期保值策略和电力期权的定价方法,推导了电力期货的动态和静态最优保值率公式和电力期权基于BlackScholes模型和MonteCarlo模拟的定价公式。通过对现有研究的分析和评论,最后提出了电力金融市场方面几个重要的研究领域。

关键词：电力市场电力金融市场电力衍生产品电力期货电力期权套期保值电价模型蒙特卡罗模拟

Surface reconstruction establishing Mott-Schottky heterojunction and built-in space-charging effect accelerating oxygen evolution reaction

在线全文

学校读者我要写书评

暂无评论

Nano Research 2022年第4期15卷 2952-2960页

作者： Yao Kang Shuo Wang Kwan San Hui Shuxing Wu Duc Anh Dinh xi fan Feng Bin Fuming Chen Jianxin Geng Weng-Chon(Max)Cheong Kwun Nam Hui Joint Key Laboratory of the Ministry of Education Institute of Applied Physics and Materials EngineeringUniversity of MacaoTaipaMacao 999078China Engineering Faculty of ScienceUniversity of East AngliaNorwich NR47TJUK School of Chemical Engineering and Light Industry Guangdong University of TechnologyGuangzhou 510006China NTT hi-tech institute Nguyen Tat Thanh universityHo Chi Minh city 700000Vietnam Ningbo Institute of Materials Technology EngineeringChinese Academy of SciencesNingbo 315201China State Key Laboratory of High-Temperature Gas Dynamics Institute of MechanicsChinese Academy of ScienceBeijing 100190China State Key Laboratory of Optic Information Physics and Technologies School of Physics and Telecommunication EngineeringSouth China Normal UniversityGuangzhou 510006China State Key Laboratory of Organic-Inorganic Composites Beijing University of Chemical Technology15 North Third Ring East RoadChaoyang DistrictBeijing 100029China Department of Physics and Chemistry Faculty of Science and TechnologyUniversity of MacaoTaipaMacao 999078China

Structural reconstruction of nanomaterials offers a fantastic way to regulate the electronic structure of active sites and promote their catalytic ***,how to properly facilitate surface reconstruction to overcome large overpotential that stimulate the surface reconstruction has remained ***,we adopt a facile approach to activate surface reconstruction on Ni(OH)_(2) by incorporating F anions to achieve electro-derived structural oxidation process and further boost its oxygen evolution reaction(OER)*** situ Raman and X-ray photoemission spectroscopy studies indicate that F ions incorporation facilitated surface reconstruction and promotes the original Ni(OH)_(2)transformed into a mesoporous and amorphous F-NiOOH layer during the electrochemical *** functional theory(DFT)calculation reveals that this self-reconstructed NiOOH induces a space-charge effect on the p-n junction interface,which not only promotes the absorption of intermediates species(^(*)OH,^(*)O,and^(*)OOH)and charge-transfer process during catalysis,but also leads to a strong interaction of the p-n junction interface to stabilize the *** work opens up a new possibility to regulate the electronic structure of active sites and promote their catalytic activities.

关键词： F anions dynamic migration nickel hydroxides surface reconstruction oxygen evolution reaction(OER)

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

我国电力市场竞价模型框架探讨

中国电力 2000年第11期33卷 37-40页

作者：王锡凡西安交通大学电气工程学院陕西西安710049

通过分析我国当前电力市场竞价上网存在的问题，指出在电能用户电价未开放情况下，发电侧市场是不稳定市场，上网电价可能上升到不合理程度。并讨论电力需求弹性对电力市场运营的影响，论证政府对电力市场调控的必要性与可能性，推荐了... 详细信息

通过分析我国当前电力市场竞价上网存在的问题，指出在电能用户电价未开放情况下，发电侧市场是不稳定市场，上网电价可能上升到不合理程度。并讨论电力需求弹性对电力市场运营的影响，论证政府对电力市场调控的必要性与可能性，推荐了我国电力市场竞价的模型框架。

关键词：电力市场竞价模型博弈论电力工业中国

在线全文

学校读者我要写书评

暂无评论

World Journal of Clinical Cases 2022年第11期10卷 3334-3351页

作者： Yue Qiu Hong-Tao Wang xi-fan Zheng xing Huang Jin-Zhi Meng Jun-Pu Huang Zhen-Pei Wen Jun Yao Department of Bone and Joint Surgery The First Affiliated Hospital of Guangxi Medical UniversityNanning 530000Guangxi Zhuang Autonomous RegionChina Department of Bone and Joint Surgery Guangxi Medical UniversityNanning 530000Guangxi Zhuang Autonomous RegionChina Department of Orthopedics The First Affiliated Hospital of Guangxi Medical UniversityGuangxi Medical UniversityNanning 530000Guangxi Zhuang Autonomous RegionChina

BACKGROUND Melanomas are malignant tumors that can occur in different body parts or tissues such as the skin,mucous membrane,uvea,and pia *** non-coding RNAs(lncRNAs)are key factors in the occurrence and development of many malignant tumors,and are involved in the prognosis of some *** To identify autophagy-related lncRNAs in melanoma that are crucial for the diagnosis,treatment,and prognosis of melanoma *** We retrieved transcriptome expression profiles and clinical information of 470 melanoma patients from The Cancer Genome Atlas(TCGA)***,we identified autophagy-related genes in the Human Autophagy *** R,coexpression analysis of lncRNAs and autophagy-related genes was conducted to obtain autophagy-related lncRNAs and their expression *** also performed univariate and multivariate Cox proportional risk analyses on the obtained datasets,to systematically evaluate the prognostic value of autophagyrelated lncRNAs in *** autophagy-related lncRNAs were identified and an autophagy-related prognostic signature for melanoma was *** Kaplan-Meier and univariate and multivariate Cox regression analyses were used to calculate risk *** on the risk scores,melanoma patients were randomly divided into high-and low-risk *** operating characteristic curve analysis,dependent on time,was performed to assess the accuracy of the prognostic *** the same time,we also downloaded the melanoma data sets GSE65904,GSE19234,and GSE78220 from the GENE EXPRESSION OMNIBUS database for model ***,we performed Gene Set Enrichment Analysis functional annotation,which showed that the low and the high-risk groups had different enriched *** The co-expression network for autophagy-related genes was constructed using R,and 936 lncRNAs related to autophagy were ***,52 autophagy-related lncRNAs were significantly associated with TCGA melanoma patients’survival b

关键词： Melanoma Long non-coding RNAs Autophagy Prognosis The Cancer Genome Atlas Bioinformatics