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Search Results: 1 - 10 of 32753 matches for " 于卓 "
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基于DEA方法的吉林省农业生产效率的实证分析
Empirical Analysis on Agricultural Production Efficiency in Jilin Province Based on DEA Method
 [PDF]

闫玉枫,
Statistics and Applications (SA) , 2013, DOI: 10.12677/SA.2013.23009
Abstract:

本文利用DEA方法分析了自社会主义新农村政策提出以来吉林省县级市的农业生产效率,包括规模效率、纯技术效率及全要素生产力指数的变化。本文认为吉林省县级市的规模效率处于递增状态,即依靠外界投入改变产出生产规模效益的方法取得了很好的效果。社会主义新农村政策提出以后,促进了吉林省县级市的全要素生产力指数快速增加,农村农业生产率有了显著提高。纯技术效率初期递增而后处于递减状态,说明吉林省的农业生产效率的提高除了依赖扩大生产规模,在技术层次上的投入也需进一步加强。
Based on the method of Data Envelopment Analysis, we analyzed the changes of agricultural pro- duction efficiency in county-level cities of Jilin Province, including scale efficiency, pure technical efficiency and the total factor productivity index, since the New Socialist Countryside policy was put forward. This arti- cle suggests that the scale efficiency of the county-level cities in Jilin Province shows a tendency of increas- ing, which reveals that changing the output production scale efficiency by depending on outside inputs has achieved remarkable success. New Socialist Countryside policy promotes the rapid increase of total factor productivity index in the county-level cities of Jilin Province and helps to increase the agricultural productiv- ity in rural areas. The initial increase and later decrease of pure technical efficiency illustrates that the effi- ciency of agricultural production in Jilin Province mainly relies on the expansion of production scale, and the technical inputs should be further strengthened.

小麦族10种禾草叶片可消化性及矿物质含量的差异
,SAIGA,Suguru
草地学报 , 2002, DOI: 10.11733/j.issn.1007-0435.2002.01.001
Abstract: 利用扫描电镜及能量分散型荧光X射线新技术分析小麦族10种多年生禾草叶片的可消化性和矿物质含量.结果表明,供试草种叶片可消化性的高低顺次是老芒麦>野大麦>航道冰草=加拿大披碱草>蒙农杂种冰草>诺丹冰草>肥披碱草≥新麦草=披碱草>蒙古冰草.叶片中7种矿物元素含量变幅为Mg0.21%~0.57%、Si0.90%~3.31%、P0.27%~0.3%、S0.3%~0.0%、Cl0.21%~0.52%、K1.44%~3.0%、Ca0.42%~0.98%,草种间差异显著.
大倾角、复杂地质条件下综采工作面不等长调斜开采实践

煤炭工程 , 2011,
Abstract: 针对综采工作面在大倾角、不等长、双坡度等复杂地质条件下的调斜开采,通过对常规综采工作面调斜关键技术参数分析比较,优化并最终确定了调斜方案,即采取合理对机巷刷上帮的方式,将一次集中调斜调整为两次分步骤调斜开采。实践证明该方案成功的解决了大倾角、双坡度复杂地质条件下工作面频繁加架、运输机搭接、不等长调斜等诸多难题。研究成果对复杂地质条件下综采工作面调斜方案的优化选择有一定的指导意义。
白刺根系的研究
孙祥,
中国沙漠 , 1992,
Abstract: 白刺是荒漠、半荒漠地区建群植物种之一,是骆驼和绵羊、山羊较重要的饲草。根系研究表明,白刺根系入土较浅,侧根发达。根系分布与土壤水分、紧实度有密切的关系。平均冠幅为0.87m2的白刺单株,根系干重72.1g,体积233cm3,根系总长536.1m,根系表面积1.06m2,且都以0-40cm土层占的比例较大。
基于联立方程和分布滞后模型的吉林省城乡居民收入差距影响因素分析
The Factor Analysis on the Income Gap between Urban and Rural Residents in Jilin Province Based on the Simultaneous Equations Models and the Distributed Lag Models
 [PDF]

张桓森, , 王丽敏
Statistics and Applications (SA) , 2015, DOI: 10.12677/SA.2015.44023
Abstract: 根据1978年~2012年的城乡居民收入的年度数据对吉林省城乡居民收入差距的发展变化状况进行了比较分析,分析得出吉林省城乡居民收入都在迅速增长,吉林省城镇居民可支配收入和农村居民纯收入都比全国平均水平高,但城乡居民收入差距存在不断扩大的趋势。根据指标的可量化性选取11个影响城乡居民收入差距的可测指标,建立了分布滞后和联立方程模型,对影响吉林省城乡居民收入差距的各因素及其关系进行分析。分析结果表明,目前城乡居民收入差距与经济增长之间存在复杂的矛盾。政府必须从多方面多角度提供相应政策来缩小城乡收入差距;对于农村,要加大新型农村建设的支持力度,提高农村居民的收入水平,合理调节收入分配。否则收入差距的扩大将导致收入不均等–经济衰退–收入不均等的恶性循环。根据模型结果及分析给出缩小吉林省城乡收入差距的合理建议。
According to the annual data of 1978-2012, we compare and analyze the changing situation and development of the income gap between urban and rural areas in Jilin province. According to the analysis, we get that the income of urban and rural residents in Jilin province is growing rapidly, the urban disposable incomes and the rural residents’ pure income are both higher than the cor-responding national average levels, but the income gap between urban and rural has enlarged trend constantly. Based on the quantifiable of the index, we select 11 measurable attributes that may influence the income inequality and build the Distributed Lag Models and the Simultaneous Equations Models to analyze the effect of the attributes and their relations on the income inequality. The results indicate that there is a conflict between the income inequality and the economic growth. Government must provide corresponding policies and supports to narrow the income gap from the multi-side and multi-view. In rural areas, government should strengthen the support to the construction of the New Rural, and raise the level of rural residents’ income, adjust income distribution reasonably. Otherwise, the expansion of the income gap will lead to a vicious cycle of “income inequality-the recession-income inequality”. On the basis of the model and analysis, we are given reasonable suggestions to narrow the income gap between urban and rural areas of Jilin province.
科技人才政策的阶段性特征
盛亚,
科技进步与对策 , 2015, DOI: 10.6049/kjjbydc.2014040151
Abstract: 以“九五”时期以来浙江省颁布的119份科技人才政策为研究样本,采用“政策年度”、“适用对象”、“政策类别”和“政策文种”四维度对政策文本进行计量分析。研究发现,不同时期浙江省科技人才政策与该时期的浙江省经济和社会发展战略导向密切相关,但是政策有明显的阶段性特征,其连续性和稳定性亟待提高;有关人才评价、人才激励以及人才保障类型的政策需进一步完善;已颁布政策有较强规范性和约束性,而指导性与可操作性不强。科技人才人才政策政策特征文本分析
老年便秘性结直肠穿孔的诊治体会
The Experience of Diagnosis and Treatment of Colorectal Perforation Caused by Constipation in Elderly Patient
 [PDF]

, 张宗明, 张翀, 万柏江, 宏伟
Hans Journal of Surgery (HJS) , 2014, DOI: 10.12677/HJS.2014.32002
Abstract:
老年便秘性结直肠穿孔起病隐匿、误诊率高、死亡率高,需引起临床高度重视。本文结合一例92岁老人的便秘性乙状结肠穿孔的诊治体会,探讨老年人便秘性结直肠穿孔的病因、诊断、治疗和预防。
The clinical characteristics of colorectal perforation caused by constipation in elderly patient are insidious onset, easy to be misdiagnosed, high mortality, making it to must be paid more attention by clinicians. The present paper is to explore the cause, diagnosis, treatment and prevention of colorectal perforation caused by constipation in elderly patient, based on our experience in the diagnosis and treatment of colorectal perforation caused by constipation in a 92-year-old female patient.
Empirical Likehood in Partial Linear Model Under NA Samples
NA误差下部分线性模型的经验似然推断

YU Zhuoxi,

系统科学与数学 , 2009,
Abstract: This paper is concerned with the typical partial linear model $y_{i}=\beta x_{i}+g(t_{i})+e_{i}, 1\leq i \leq n, $ where $(x_{i},t_{i}) $ are fixed design points, $g$ is an unknown function, and $e_{i}$'s are negatively associated (NA) random errors. An empirical log-likelihood ratio for the regression coefficient is proposed, the results show that the statistic is asymptotically chi-squared distributed and that the confidence intervals can be constructed accordingly.
低周疲劳的裂纹扩展速率da/dN研究
绶章,
力学与实践 , 1987,
Abstract: 本文介绍了近几年国内外关于低周疲劳裂纹扩展的研究情况,给出有关著作和文中中发表的低周疲劳da/dN的一些表达式,以及新发展起来的弹塑性有限元法如何用于疲劳裂纹扩展的分析和计算,最后讨论了低周疲劳裂纹扩展的一些影响因素。
柔性网护顶技术在综采面快速回撤中的应用
郭辉,,陈宁
煤炭工程 , 2015, DOI: 10.11799/ce201508024
Abstract: 基于工作面回撤期间易受顶板冒落、煤壁片帮的影响,通过引入纤维柔性网护顶技术代替金属网片铺、联网工艺,简化了工作面收尾作业工序,降低了职工的劳动强度和危险性系数,提高了工作面资源利用率和回撤效率,该工艺对类似条件下的综采面快速回撤具有较好的借鉴价值。
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