企业采购组织的绩效评价研究 ——以宁波市上市企业为例

通过构建超效率BCC模型和Malmquist指数模型,对2015-2019年10家宁波市上市企业采购组织的绩效进行评价分析.结果显示:10家宁波市上市企业采购组织的综合技术效率均值为0.849,整体表现较好,但仍存在较大的提升空间;全要素生产指数年均增长率为4.4％,技术进步增长率为8.4％,表明技术进步对全要素生产指...     

山东省十七地市可持续发展能力分析

结合国内外可持续发展指标体系的研究成果,运用主成分分析法构建山东省十七地市可持续发展能力综合评价指标体系和评价模型.该体系共分3层,涉及经济、社会、资源与环境3个方面共32项指标,运用2012年数据和评价模型,对山东省可持续发展能力进行了综合评价.     

新常态下我国工业技术进步的测度及影响研究——基于省际面板数据的实证分析

利用我国经济发展步入新常态时期的2012—2014年的工业数据,增加涵盖人口、环境变化的产出变量,使用DEA数据包络的Malmquist指数法测算我国各省市工业技术进步状况,并基于省际面板数据使用Cobb-Douglas生产函数估计工业技术进步对工业产出的影响,结果表明:2012—2014年期间我国工业技术年均进步5.3%,相比1999—2009年期间,我国工业技术进步平均增长率从4.5%提高了0.8%.采用固定效应模型和随机效应模型,估计技术进步对工业产出的弹性分别为0.35%和0.38%.     

“双碳”目标下区域生态效率评价及提升路径研究——以长江经济带为例

长江经济带的城市生态效率表现出明显的区域性特征。通过非期望产出超效率SBM模型，对2012—2020年长江经济带11个省市的城市生态效率进行测算，采用Malmquist指数和Tobit模型，对测算结果进行分析，并探究影响城市生态效率的因素。结果表明，区域的生态效率整体上自东向西逐渐降低，空间集聚效应明显；科学技术是长江经济带生态效率的主要增长点；同时，人均国内生产总值对长江经济带城市生态效率的影响通过1%的显著性检验，影响明显。应处理好经济发展与生态保护的关系，控制来自生活、工业的污染；要发展信息和自动化产业，以绿色、集约、高科技为重点，加快传统产业转型升级；坚持绿色发展、生态优先的理念，依靠科技进步提高资本和人力的产出效率。     

基于SE-DEA的山东省城市物流效率评价分析

山东省各地市经济基础不同,物流业的发展水平与效率也有较大差异,而这种差异会阻碍山东省经济的持续、协调、健康发展.以山东省17地市的物流业为研究对象,通过构建科学的物流效率指标评价体系,结合2012年山东省经济发展的相关数据,应用DEA和SE-DEA模型对各地市物流效率进行研究,并提出相应发展建议.     

中国旅游生态效率与旅游绿色创新效率的耦合协调时空特征及其影响因素

采用超效率—DEA模型分别测算2008—2017年中国31省(区、市)的旅游生态效率与旅游绿色创新效率,再结合耦合协调模型测算评价二者的耦合协调度及其时空耦合特征,最后借助地理探测器探究二者耦合协调的影响因素.结论表明:1)研究期内,中国旅游生态效率与旅游绿色创新效率的耦合协调度主要处于勉强协调阶段,时序演变不大;省域...     

基于GM(1,1)模型的国内旅游需求规模预测

利用灰色模型对2012-2015年国内旅游需求规模进行了预测。通过计算,预测出2012-2015年国内旅游人数每年以2亿人次左右的数量增长,年均增长率为9%。研究表明:中国国内旅游需求规模是不断上升的,国内旅游将呈现良好发展的势头。     

新疆伊犁州农业生态效率时空差异探究 ——基于超效率非期望SBM模型和Malmquist指数

以新疆伊犁哈萨克自治州24个县市为研究区,运用超效率非期望SBM模型和Malmquist指数探讨2004—2017年伊犁州农业生态效率时空差异.结果表明,伊犁州农业生态效率总体在时间上呈波动平缓下降趋势;24县市农业生态效率在空间上呈现出明显的异质性,2004—2017年效率低值区向伊犁州东北和西南方向扩张,逐渐演化为...     

西部地区农业生态效率评价及影响因素研究

目的 分析2010-2019年西部地区农业生态效率水平并探讨农业生态效率的影响因素。方法 运用非期望超效率SBM模型和Malmquist指数测度农业生态效率，并运用面板Tobit模型对农业生态效率的影响因素进行研究。结果 (1)2011-2019年，西部地区农业生态效率整体呈现出“N”型趋势，且地区间差异较大；(2)2019年甘肃、内蒙古、宁夏、青海、四川和云南的生产要素投入和碳排放产出均存在不同程度冗余；(3)西部地区全要素生产率呈现出“U”型趋势，且全要素生产率增长主要由技术进步驱动；(4)西部地区农业生态效率受到规模化水平、机械化水平、受灾率、农民收入水平、环境规制水平与技术投资水平等多方面影响。结论 需从农业要素节约、高效投入，严格控制农业碳排放和加大农业技术投资与环境污染治理投资3方面对西部地区农业生态效率进行提高和改进。     

基于DEA和Malmquist指数的河南省技术 创新效率评价研究

科学评价河南省技术创新效率有利于推动河南省的经济发展.运用DEA模型和Malmquist指数分解法测算了河南省2010—2017年各市技术创新效率.研究结果表明,研究期间内各市的综合效率大部分呈上升趋势,个别有下降趋势;从Malmquist指数分解法来看,随着年份的增加,全要素生产前期有下降趋势,从2013年开始呈现上升趋势且受技术进步影响较大.最后根据研究结果提出相应的建议及措施.     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Lower Paleozoic oil relationships within Williston Basin, Canada

The Williston Basin is a significant petroleum province, containing oil production zones that include the Middle Cambrian to Lower Ordovician, Upper Ordovician, Middle Devonian, Upper Devonian and Mississippian and within the Jurassic and Cretaceous. The oils of the Williston Basin exhibit a wide range of geochemical characteristics defined as "oil families", although the geochemical signature of the Cambrian Deadwood Formation and Lower Ordovician Winnipeg reservoired oils does not match any "oil family". Despite their close stratigraphic proximity, it is evident that the oils of the Lower Palaeozoic within the Williston Basin are distinct. This suggests the presence of a new "oil family" within the Williston Basin. Diagnostic geochemical signatures occur in the gasoline range chromatograms, within saturate fraction gas chromatograms and biomarker fingerprints. However, some of the established criteria and cross-plots that are currently used to segregate oils into distinct genetic families within the basin do not always meet with success, particularly when applied to the Lower Palaeozoic oils of the Deadwood and Winnipeg Formation.     

An Analysis of Catherine＇s Character——Wuthering Heights

Wuthering Heights, Emily Bronte＇s only novel, was published in December of 1847 under the pseudonym Ellis Bell. The book did not gain immediate success, but it is now thought one of the finest novels in the English language. Catherine is the key character of this masterpiece, because everybody and everything center on her though she had a short life. We can understand this masterpiece better if we know Catherine well.     

Characterization of Ordovician carbonate reservoirs, southeastern Saskatchewan, Canada

The discovery of the prolific Ordovician Red River reservoirs in 1995 in southeastern Saskatchewan was the catalyst for extensive exploration activity which resulted in the discovery of more than 15 new Red River pools. The best yields of Red River production to date have been from dolomite reservoirs. Understanding the processes of dolomitization is, therefore, crucial for the prediction of the connectivity, spatial distribution and heterogeneity of dolomite reservoirs.The Red River reservoirs in the Midale area consist of 3～4 thin dolomitized zones, with a total thickness of about 20 m, which occur at the top of the Yeoman Formation. Two types of replacement dolomite were recognized in the Red River reservoir: dolomitized burrow infills and dolomitized host matrix. The spatial distribution of dolomite suggests that burrowing organisms played an important role in facilitating the fluid flow in the backfilled sediments. This resulted in penecontemporaneous dolomitization of burrow infills by normal seawater. The dolomite in the host matrix is interpreted as having occurred at shallow burial by evaporitic seawater during precipitation of Lake Almar anhydrite that immediately overlies the Yeoman Formation. However, the low δ18O values of dolomited burrow infills (-5.9‰～ -7.8‰, PDB) and matrix dolomites (-6.6‰～ -8.1‰, avg. -7.4‰ PDB) compared to the estimated values for the late Ordovician marine dolomite could be attributed to modification and alteration of dolomite at higher temperatures during deeper burial, which could also be responsible for its 87Sr/86Sr ratios (0.7084～0.7088) that are higher than suggested for the late Ordovician seawaters (0.7078～0.7080). The trace amounts of saddle dolomite cement in the Red River carbonates are probably related to "cannibalization" of earlier replacement dolomite during the chemical compaction.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

Design and analysis of generic LBS application developing platform

Location based services is promising due to its novel working style and contents.A software platform is proposed to provide application programs of typical location based services and support new applications developing efficiently. The analysis shows that this scheme is easy implemented, low cost and adapt to all kinds of mobile nework system.     

橡胶颗粒沥青混合料低温抗裂性试验研究

以AC-13级配为基础,将橡胶颗粒代替部分集料掺入混合料中,以低温弯曲试验为评价方法对不同橡胶颗粒掺量下沥青混合料的低温抗裂性进行研究,并引入应变能密度值对混合料的低温抗裂性进行综合评价.试验结果表明:橡胶颗粒沥青混合料试件的破坏微应变均超过2 300,满足冬寒区的技术指标;无论是否掺加橡胶颗粒,随着温度的下降,沥青混合料破坏时的最大弯拉强度增大,弯拉应变降低,劲度模量增大;弯曲应变能密度在胶粒掺量为1%左右时具有较大的弯曲应变能密度值,此时橡胶颗粒沥青混合料具有较好的低温抗裂性.     

A computer generator for randomly layered structures

AcomputergeneratorforrandomlylayeredstructuresYUJia shun1,2,HEZhen hua2(1.TheInstituteofGeologicalandNuclearSciences,NewZealand;2.StateKeyLaboratoryofOilandGasReservoirGeologyandExploitation,ChengduUniversityofTechnology,China)Abstract:Analgorithmisintrod…     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

Quantitative trait loci （QTLs） for quality traits related to protein and starch in wheat

Quality traits in wheat （Triticum aestirum L.） were studied by quantitative trait locus （QTL） analysis in a recombinant inbred line （RIL） population, a set of 131 lines derived from Chuan 35050 × Shannong 483 cross （ChSh）. Grains from RILs were assayed for 21 quality traits related to protein and starch. A total of 35 putative QTLs for 19 traits with a single QTL explaining 7.99-40.52% of phenotypic variations were detected on 10 chromosomes, 1D, 2A, 2D, 3B, 3D, 5A, 6A, 6B, 6D, and 7B. The additive effects of 30 QTLs were positive, contributed by Chuan 35050, the remaining 5 QTLs were negative with the additive effect contributed by Shannong 483. For protein traits, 15 QTLs were obtained and most of them were located on chromosomes 1 D, 3B and 6D, while 20 QTLs for starch traits were detected and most of them were located on chromosomes 3D, 6B and 7B. Only 7 QTLs for protein and starch traits were co-located in three regions on chromosomes 1D, 2A and 2D. These protein and starch trait QTLs showed a distinct distribution pattern in certain regions and chromosomes. Twenty-two QTLs were clustered in 6 regions of 5 chromosomes. Two QTL clusters for protein traits were located on chromosomes 1D and 3B, respectively, three clusters for starch traits on chromosomes 3D, 6B and 7B, and one cluster including protein and starch traits on chromosome 1D.