白银地区风电产业发展现状分析与对策研究

随着国家发展清洁能源与实现绿色增长等低碳目标的提出,风电产业得到了快速发展。风力资源优良的白银地区抓住机遇大力发展风电产业,但由于风电具有的随机性以及间歇性的特点,会给电网的稳定和安全运行带来巨大冲击。本文对白银地区风电并网情况、建设规划情况进行了分析,剖析了当地风电产业存在的问题及其原因,并从电源和电网的协调发展、相关政策和标准体系建设等方面提出了改善措施和建议,对促进白银地区风电发展具有一定的借鉴作用。     

国有林场改革成效评价——职工获得感的统计分析

利用国有林场职工监测数据,基于物质维度和精神维度,从改革后职工自身的收益情况、职工对林场的整体评价、职工对林场管理方式的评价等方面,采用比较分析法和主成分分析法对国有林场改革职工获得感进行分析。研究结果表明:国有林场改革后职工获得感有所提升,改革进程与职工获得感呈强正相关性,改革促进了林场的可持续发展。但林场整体基础设施环境一般,场部相对较好,管护站点则较差。同时,在领导班子建设方面应注重自主、公平,仍需提高领导水平。     

Will future land based food and fibre production be in family or corporate hands? An analysis of farm land ownership and governance considering farmer characteristics as choice drivers. The New Zealand case

Family farming in various guises has been the dominant ownership and governance system in primary production over recorded history. This outcome has been controlled by farmers and their families, possibly due to tradition, opportunities, personal characteristics, skill sets and the nature of primary production. Of these, it is hypothesised that the farmers’ personal characteristics play a major part in the choice, and continuance, of current ownership and governance systems. Equally as important, they, and therefore the land ownership system, play a part in the efficiency of production systems and improvement of the biological and production environment.The benefits and difficulties of commonly used ownership systems in Western society are reviewed. Using a sample of New Zealand (NZ) farms, a comparison of the managers’ features for owner/operator, partnership and corporate based systems is presented. There were significant differences in many variables including the farmers’ age, education, number of children, asset levels, years on the current farm, and similar, but more importantly, the farmers in the ownership system groups had differing personal characteristics. Significantly, despite the corporate based farms employing more professional assistance, the profit levels were similar across ownership systems leaving the farmers’ characteristics the main factors correlating with system choice. However, governance systems per se are only marginally correlated with production systems and efficiency.As successive generations of farmers are unlikely to have different characteristics, and corporate based systems continue to exhibit similar profit levels, relatively simple family based systems will continue to dominate farm land ownership and control. The trends suggest family farms will increase in size and involve family conglomerates facilitating the management of larger, and in many cases multiple, farms. While currently there are few differences in biological efficiency between ownership systems, given the efficiency benefits of size and scale, this could well change with the increase of family conglomerates. Relative to increasing corporatisation, the continuance of family based ownership and governance will also be of benefit to the environment. When developing land policies, these highlighted relationships should be taken into account. This study is a first to consider personal characteristics relative to ownership.     

新疆兵团经济发展中的农村金融深化分析

资金短缺而需求旺盛是中国广大农村面,临的一个共同问题,对此现实情况,政府和学者们借鉴国外成功经验探索本国农村金融深化道路,并取得了一定成绩。新疆生产建设兵团根据自己的现实情况,循序渐进将金融资源推向农牧团场,帮助团场致富。文章试图就目前兵团农牧团场金融深化情况进行分析,提出建议,以使金融资源能够更好地为兵团农牧团场经济发展服务。     

不确定性条件下风电并网成本分摊方式对风电供给函数的影响

根据风电间歇性特点,分析不同的并网成本分摊方式对风电供给函数的影响。基于并网成本是可再生能源投资的一个重要组成部分,研究风电生产商和电网运营商的成本分配责任界限,和不同的并网成本分摊方式对分配机制的影响。结果证明:若并网成本由电网运营商来承担,则会产生较低的生产者剩余并且致使电力消费者获得较少的转移成本。     

基于平价上网的海上风电可靠性研究

海上风电是最具规模化开发价值的可再生能源,预计2020年我国累计装机容量突破8.5GW。海上风电的运维成本在度电成本占比25%～40%。2019年起国家推行风电平价上网,对海上风电的发展带来深刻影响。通过海上风电度电成本分析,建立成本-效益模型。研究发现,风电设备的可靠性、可利用率决定了运维成本和度电成本的水平。基于成本-效益模型测算某海上风电项目的度电成本,风机设备可利用率为97.15%时,运维成本下降26.88%,度电成本最低,为0.575 2元/kW·h。     

我国家庭农场历史与发展探析

在叙述和分析家庭经营发展历史阶段的基础上,探究了家庭农场这一新型农业经营主体概念提出的背景和原因,接着对家庭农场规模、劳动力、收入、资金来源等进行了深入分析和探讨,找出家庭农场区别其他经营主体的几大特点.在家庭农场概念、特点的基础上,对目前家庭农场发展遇见的问题和困难进行了分析,并提出相应的解决建议.     

Productivity and Producer Welfare in the Presence of Production Risk

Production risk is an inherent characteristic of agriculture and changes in production risk will affect the welfare of risk‐averse producers. Using standard concepts from the literature on uncertainty, we introduce a welfare measure which comprises total factor productivity (TFP), production risk and farmer risk preferences, and which reflects the impact on producer welfare of changes in production technology. An empirical application is carried out using data from a sample of Spanish dairy farms which shows how the positive impact of increases in TFP on welfare can be offset by increases in the risk premium (‘cost of risk’) to the point where welfare may decrease.     

矿用风速表示值误差的测量不确定度评定

通过矿用风速表检定装置对风速表示值误差进行不确定度评定。     

用AUTOLISP实现分马力电机可变尺寸图形的绘制

AUTO LISP 是嵌套在 AUTO CAD 绘图软件包中的一种功能很强的智能语言,可在绘图软件包环境下直接运行,是一种很适合绘制“可变尺寸图形”的方法。本文详细地研究了 AUTO LISP 源程序编制、在系统状态下编辑程序和在 HCAD 状态下绘图等内容。对 AUTO CAD 的开发应用具有重要作用。