Development Strategy Research of Private enterprises in Oil Industry

石油作为关系国计民生的重要商品，其市场供需关系的变化与整个国民经济发展与运行密不可分，石油资源不仅是一种重要的能源，而且也是一种重要的经济资源和战略资源。近年来，中国石油石化市场逐步形成了以国内三大石油公司（中石化、中石油、中海油）为主导，跨国石油公司为组成成分，民营企业为重要补充的多元化的竞争格局。其中民营石油企业主要集中在中下游，包括民营资本投资的地方炼油、成品油批发和一部分加油站，其发展历程反映了中国石油市场的曲折发展和国家政策的变化。随着世界石油市场竞争的加剧。石油企业的经营管理受到越来越广泛的关注。我国民营石油下游企业如何准确市场定位，有效制定发展战略，是本文研究的初衷。 在受国际...Oil as a relationship and the people's livelihood important goods, the market supply and demand relations change and the whole national economic development and operation are inseparable, oil resource is not only an important source of energy, and also is a kind of important economic resources and strategic resources. In recent years, China's petroleum and petrochemical market gradually formed the...学位：工商管理硕士院系专业：管理学院高级经理教育中心（EMBA项目）_高级管理人员工商管理硕士(EMBA)学号：X201215634

退火对4-硝基苯硫酚分子常规拉曼峰的影响

文章利用氮气氛围下退火实验实现了4-硝基苯硫酚(PNTP)固体粉末样品中PNTP分子和4,4’-二硝基二苯二硫醚(NPDS)分子的有效分离,考察了不同温度对退火的影响,并利用拉曼光谱对其进行定性分析,同时利用理论计算对NPDS分子的拉曼峰进行了指认.该方法为快速定性PNTP分子中是否含有NPDS提供了快速简便的方法.福建省自然科学基金面上项目(2019J01746

近海生态系统碳汇过程、调控机制及增汇模式

海洋是地球上最大的碳库,发挥着全球气候变化缓冲器的作用.蓝色碳汇,简称蓝碳,即由海洋生态系统捕获的碳(主要是有机碳),是海洋储碳的重要机制之一.; 蓝碳最初认识的形式是可见的海岸带植物固碳.其实之前没有得到足够重视的、看不见的微型生物(浮游植物、细菌、古菌、病毒、原生动物)占海洋生物量90%; 以上,是蓝碳的主要贡献者.中国陆架边缘海占国土总面积的1/3,碳汇潜力巨大,亟待研发.本文以近海生态系统碳汇过程、调控机制及增汇模式为主线,论述; 了近海生态系统结构与碳循环功能特征、碳汇形成过程与机理,并结合近海碳汇在沉积记录中的地史过程演变探讨了自然过程和人类活动对碳汇的可能影响,展望了; 碳汇工程在增加近海海洋储碳能力方面的应用前景.国家重大科学研究计划项目; 国家重点研发计划项目; 国家自然科学基金项目; 国家海洋局全球变化与海气相互作用专项项

Experimental study on reperfusion of intraocular lens

作者简介: 祁明信, 男, 1945 年7 月 出生, 教授、主任医师、博士研究生 导师, 主要从事白内障的基础与临 床研究。联系电话: 0591-83570887; E-mail:qihuang@netease. com 通讯作者: 黄秀榕,E-mail:[email protected][中文文摘]目的开展晶状体再灌注的离体和动物实验研究,并对再灌注人工晶状体技术进行评价。方法采用新鲜离体幼兔眼、离体猪眼、新西兰白兔眼,应用自行研制的人工晶状体材料,进行以下实验:(1)体外固化实验;(2)晶状体前囊膜微型撕囊及其稳固性实验;(3)经微型前囊膜开口超声乳化吸出晶状体内容物实验;(4)活的新西兰白兔眼内人工晶状体再灌注实验。结果(1)按硅酮聚合物与固化剂50:1的比例可获得柔软、弹性好、固化时间短(完全固化时间为60min)的注入材料;(2)晶状体前囊膜1.8～2.0mm的连续环形撕囊口具有较好的稳定性,可经该微型开口吸出晶状体内容物并灌注材料;(3)超声能量18%、流量25mL·min-1、负压120mmHg(1kPa=7.5mmHg)为晶状体内容物经微型前囊膜开口吸出的最佳条件;(4)注入灌注材料后可形成由晶状体囊膜包裹的、置换原晶状体皮质和核的、新的再灌注人工晶状体。结论采用再灌注人工晶状体的方法可进行新型人工晶状体再灌注,可为治疗白内障和老视提供参考。[英文文摘]Objective To carry out the experimental study on reperfusion of intraocular lens(IOLs) in vitro or in animal,and to assess the technique of IOLs reperfusion.Methods The following experiments were performed by using self-developed materials in fresh rabbit eyes and pig eyes in vitro,as well as in eyes of alive New-Zea-land rabbits:(1)Solidification study of self-developed material in vitro;(2)Continuous circular capsulorhexis(CCC) in anterior capsule of lens and its stability;(3)Draw of lens contents via phaco through mini-CCC;(4)IOLs ref illing in the eyes of alive New-Zea land rabbits. Results(1) Thematerialwhich was soft, springy and short-term solidification(full solidification time was 60 minutes) were obtained in certain proportion of geland solidified agent(50:1) in vitro; ( 2)The CCC in anterior capsule of lens with 1.8-2.0 mm diameter had very good stability. The lens contents were drawn and the materialwere refilled through themini-CCC; (3) The best conditions of drawing out lens contents through m ini-CCC were phaco energy 18% , flow 25 mL·min- 1, and negative pressure 120 mmH g (1kPa=7.5 mmHg);(4) The new refilled IOLs, which were wrapped by capsule of lens and were replaced original cortex and nucleus of lens, were obtained after thematerial refillied. Conc lusion. New IOLs are refilled through this method, which can prov ide reference for the treatment of cataract and presbyopia.福建省科技三项费用;教育厅重点资助项目基金资助(编号:K98041

若干并行计算模型上的N体问题求解算法

从在实际中广泛应用的N体问题入手,研究如何在几种实际的并行计算模型(PRAM、APRAM、BSP、LogP、NHBL)上设计具体的并行算法;给出了这些模型上的并行算法的设计模式,分析不同模型上算法的性能,比较各个模型上算法设计风格以及算法性能的差异,并对这些并行计算模型做一个综合的评价

小尺度产业空间组织动向与园区规划对策

全球化和气候变化加速了产业空间组织影响因素的改变,约束条件由原料、市场和劳动力三大因素扩展到产业协作、投资与人居环境、资源环境、文化等多方面,从而使得小尺度的产业空间组织出现新动向。本文认为小尺度产业空间合理的演变应遵循园区综合效益正向最大化的规则,演变过程体现为空间布局、时序安排和系统组织三者的综合效率最优的目标指向,园区规划应是实现这一目标的方案设计;园区规划同时要充分考虑土地资源总量约束和建设适宜性综合平衡问题。本文从产业体系节点组织、资源环境要求、园区功能塑造、与城镇化的关系以及市场和政府驱动等方面对园区规划提出了若干对策建议

臭氧改性碳纤维/聚酰亚胺复合材料的制备与性能研究

采用臭氧氧化的方法对碳纤维进行表面改性,并用作热塑性聚酰亚胺树脂的增强体。采用单丝拉伸试验、XPS研究臭氧处理时间对碳纤维单丝拉伸强度和表面官能团的影响。结果表明,臭氧处理时间越长,碳纤维力学性能的下降程度越大,而表面含氧官能团含量越多。优选单丝拉伸强度保留率较高、含氧官能团含量较丰富的碳纤维与热塑性聚酰亚胺制成复合材料,并评价其层间剪切强度(ILSS)。结果表明,臭氧处理5 min就可使碳纤维/聚酰亚胺复合材料的ILSS提升43%,说明臭氧处理可显著提升碳纤维/热塑性聚酰亚胺的界面性能

Unknown parental group effects on harvest body weight in the base population of Litopenaeus vannamei

The whiteleg shrimp, Litopenaeus vannamei, is an introduced species in China; the genetic relationship and genetic background among introduced populations in China are not clear. To analyze the effects of these unknown parent groups (UPG) in the basic population of L. vannamei, three populations with different growth rates and survival rates were collected as founder populations and were established as the base population by the diallel- cross design. Four models, namely, the Best Linear Unbiased Prediction based on Pedigree (pBLUP), the pBLUP with genetic groups (pBLUP-GG), the Single Step Genomic BLUP (ssGBLUP), and the ssGBLUP with Metafounders (ssGBLUP-MF), were used to estimate variance components for the body weight of the base population. The effects of UPG on genetic parameters and breeding value across the four models were compared and analyzed by cross validation. The results showed that the highest additive genetic variance (22.58 4.39) and heritability (0.91 0.10) were obtained using the pBLUP model. The pBLUP-GG, ssGBLUP, and ssGBLUP-MF models decreased additive genetic variance by 16.25%-61.20% and heritability by 15.38%-46.15% compared with that of the pBLUP model. The 5-fold cross validation for genotyped and ungenotyped individuals indicated that the accuracy of the pBLUP model was the lowest (0.64-0.68) of all estimates, and the accuracies of the other three models increased by 7.25%-10.53% compared with that of the pBLUP model. The prediction bias of the other three models decreased by 2.83%-7.56% compared with that of the pBLUP model (1.06-1.19). In conclusion, the models considering UPG effects could avoid the overestimation of additive genetic variance components for body weight in the basic population of L. vannamei