14 research outputs found
A Research on the Strategies for Coping with Big Business Disease
随着经济全球化和国际竞争的加剧,生存和发展成为各企业发展战略的重中之重。在企业的成长壮大过程中,各国的大企业慢慢都出现了不同程度的大企业病。随着我国市场经济的发展,以及全球经济一体化速度的加快,应对大企业病,保持企业健康发展是全面提高我国企业国际竞争力的有效手段。因此,本文立足大企业病的表现和原因,提出了应对大企业病的理论体系框架、内容和方法,为全面提高企业的竞争力提供了理论依据和操作建议。 本文采用规范与实证、历史与逻辑相结合的分析方法,对大企业病的表现、危害等进行了系统分析,论证了应对大企业病的必要性,并分析总结了大企业病发生的原因,进而提出了应对大企业病的七个策略,并最终与麦肯锡7S模...With the intensification of globalization and international competition, business survival and development have become the top priority in the business development strategies. In the process of business expansion, Big Business Disease of different degrees emerges slowly among many big businesses. But, with the development of our country’s market economy and the acceleration of globalization, Big B...学位:工商管理硕士院系专业:管理学院_工商管理硕士(工商管理硕士)学号:X200915613
Simplifying the Creation of Hollow Metallic Nanostructures: One-Pot Synthesis of Hollow Palladium/Platinum Single-Crystalline Nanocubes
通讯作者地址: Zheng, NF (通讯作者), Xiamen Univ, Coll Chem & Chem Engn, State Key Lab Phys Chem Solid Surfaces, Xiamen 361005, Peoples R China
地址:
1. Xiamen Univ, Coll Chem & Chem Engn, State Key Lab Phys Chem Solid Surfaces, Xiamen 361005, Peoples R China
2. Xiamen Univ, Coll Chem & Chem Engn, Dept Chem, Xiamen 361005, Peoples R China
电子邮件地址: [email protected],20871100,20721001
MSTC,2009CB930703
Chinese Ministry of Education 108077
RFDP 200803841010
Key Scientific Project of Fujian Province of China 2009HZ1010
tbabco2水合物形成过程的微观实验
四丁基溴化铵(TBAB)半笼型水合物在二氧化碳(CO_2)捕集和封存技术中具有巨大的发展与应用潜力。由于晶体结构的复杂性,TBAB半笼型水合物的动力学过程尚未得到充分的研究。为了解TBAB半笼型水合物在储气方面的动力学特性,实验采用原位激光拉曼技术和多晶粉末X射线衍射仪(PXRD)对nCO_2· TBAB·26H_2O和nCO_2·TBAB·38H_2O水合物的光谱特征进行了鉴别与分析,利用原位激光拉曼技术考察了CO_2分子分别进入2种晶体结构的动力学过程。研究结果表明,2种晶体结构的拉曼光谱具有较高的相似性,值得注意的是nCO_2·TBAB·26H_2O中位于1 309.5和1 326.9cm~(-1)的拉曼峰为TBA+阳离子中 C—C键的变形振动峰,在nCO_2·TBAB·38H_2O水合物中峰基本不发生改变,但半峰宽降低,峰形也变得相对清晰;同时,nCO_2·TBAB·26H_2O中位于1 446.6和1 458cm~(-1)的拉曼峰为TBA+阳离子中C—H键的剪切振动峰,在nCO_2·TBAB·38H_2O水合物中分别向左、右两边发生了位移,峰形的重叠度也随之下降。依据上述2处拉曼光谱特征可以对2种晶体结构进行辨别。通过PXRD图谱可以发现2种晶体结构的衍射图谱存在着比较明显的差距。nCO_2·TBAB·26H_2O晶体属于四方晶系,空间群(P4/m),而nCO_2·TBAB ·38H_2O属于正交晶系,空间群(Pmma)。图谱中2θ=8.406°和10.941°分别为nCO_2·TBAB·38H_2O的(200)和(220)晶面的特征峰,而2θ=5.976°和6.969°分别为nCO_2·TBAB·26H_2O的(012)和(003)晶面特征峰,可以用来判别样品中水合物的晶体结构。在原位拉曼测量过程中,nCO_2·TBAB·26H_2O和nCO_2·TBAB·38H_2O分别在已经合成好的TBAB·26H_2O和TBAB·38H_2O水合物表面形成。在276K, 2MPa条件下,气相中的CO_2分子分别进入2种晶体结构中用于储气的512笼形结构,在1 275.4和1 379.3 cm~(-1)处形成特征峰并逐渐增长。实验以2种TBAB水合物位于1 110.3cm~(-1)的拉曼峰作为参考,比较了CO_2在水合物中的增长速率。研究发现在反应初期的75min内CO_2在2种水合物中的含量基本保持线性增长且上升速率的差别不大。由于测量点位于水合物表面,受气体在水合物中扩散的阻力较小同时2种TBAB水合物均采用512笼形结构储气导致了储气速率相近。以上的微观晶体结构研究结果对TBAB水合物法捕集和封存CO_2技术应用具有重要的意义
沉积物中天然气水合物生成与分解过程的电阻率变化
测定天然气水合物在沉积物形成和分解过程中电阻率的变化对海底天然气水合物的勘探开采具有重要的意义。利用设计的水合物实验装置,以99.9%的甲烷气体—3.5%氯化钠溶液—南海沉积物为研究体系,模拟测量了温度周期变化下海底沉积物中天然气水合物形成与分解过程的电阻率。实验结果表明:当水合物在沉积物中生成时,沉积物电阻率增大。水合物初始成核时,沉积物的电阻率从4.493Ω·m减小至3.173Ω·m,随着水合物的大量形成、聚集,沉积物的电阻率增大至3.933Ω·m,最后随着松散的水合物逐渐老化致密,沉积物的电阻率逐渐减小趋于稳定至3.494Ω·m。当水合物分解时,沉积物电阻率减小。沉积物的电阻率随水合物的分解从6.763Ω·m减小到2.675Ω·m,最后趋于稳定至2.411Ω·m。温度震荡可促进沉积物中高饱和度水合物的形成,并且沉积物的电阻率随水合物饱和度增加而增大。样品的水合物饱和度从初次水合物生成时的21.80%增大到水合物再次生成时的82.17%,其电阻率从3.494Ω·m增到6.763Ω·m
南海沉积物天然气水合物饱和度与电阻率的关系
在天然气水合物勘探中,阿尔奇公式是由电阻率测井数据估算沉积层含水合物饱和度的基本公式,是对含油(气)岩心进行实验总结出的规律。但是对于水合物填充于多孔介质孔隙的沉积物,其电阻率与沉积物的物性以及水合物在孔隙的微观分布状态有关,可能存在一定的非阿尔奇现象,因此采用电阻率估算饱和度需要进行一定的校正。采用交流电桥法测量了3.5%盐水饱和的南海沉积物以及水合物在水饱和的沉积物中形成过程中的电阻率数据。水合物形成过程中其电阻率随着含水合物饱和度的增大而增大,尤其在低水合物饱和度(sn〈22%),其电阻率随着水合物的生成异常增大,含水合物沉积物的电阻率由水饱和的1.667Ω·m增大到含水合物饱和度为45%的2.661n·rn。对于含水合物的沉积物,其双对数坐标系的电阻率增大指数和含水饱和度并不是阿尔奇公式所描述的直线关系,其饱和度指数n不是定值1.9386,而随水饱和度S。的增加而增加。当54.8%〈S。〈78.6%时,n小于1.9386;当Sw〉78.6%时,n大于1.9386
桂枝汤对体温整合调节作用的活性成分研究
桂枝汤是张仲景《伤寒杂病论》中的群方之魁,主要作用为解肌发表、调和营卫[1].国家自然科学基金中文核心期刊要目总览(PKU)中国科技核心期刊(ISTIC)中国科学引文数据库(CSCD)09865-8673
Study of Starch-base Degradable Plastics Ⅱ ──Accelerated Aging Test of PE Plastics Filled With Starch In Ultraviolet Light
[中文文摘]研究了光敏剂诱发PE光降解机理以及改性淀粉、顺丁烯二酸酐等对填充PE塑料相态结构的影响;紫外光加速老化过程中试样拉伸强度、断裂伸长率随组成、光照时间的变化关系;认为合理地协调各填充组分的用量和关系,可实现填充PE塑料紫外光降解性能的可控制性。[英文文摘]The mechanism of photodegradation induced by photosensitizer and the effect of the modified starch and maleic anhydride on the phase structure of PE plastics filled with starch were studied. The relationships of the tensile strength and elongation at rupture and with composition and lighting duration of PE plastics filled with starch were also discussed. The results suggested that the controllability of photodegradation of PE plastics filled with starch in ultraviolet light could be achieved through harmonizing the content and relation of filled components reasonably
Study of Starch- base Degradable PlasticsⅢ——Degraded Test In The Environment
[中文文摘]对所设计的可环境降解塑料进行了大量的现场环境降解实验 ,包括大气直接曝露老化试验和埋土降解试验 ,获得了许多有意义的结果 .结果表明 ,各填充组分与 PE组成的复合材料 ,经大气直接曝露老化后再埋土将使降解性能得到显著的体现 ,经对各填充组分的合理设计 ,可望获得时控光 /生物降解塑料.[英文文摘]A mass of degraded tests of the degradable plastics designed in these papers in the real environment including aging test in atmosphere and degraded test in soil were carried through, which provided a large number of first hand data, and some good degradation efficiency were observed from them. The tests indicated that the composite materials composed with various additives and PE plastics designed in this paper possessed better degradable performance when they were embedded into soil after being exposed in atmosphere than embedded into soil directly. It was achieved to control photo and biodegradable plastics through devising each filled component reasonably
Study of Starch-base Degradable Plastics I—— Physical Modification of Starch and Phase Structure of PE Filled with Starch
[中文文摘]研究了偶联剂对淀粉的物理改性 ,改性淀粉加入量对填充 PE塑料体系相态结构、力学性能的影响 ,认为偶联剂的加入量大于淀粉含量的 1.0 %时 ,可获得具有较好的对 L L DPE掺混性的疏水化改性淀粉 ;提出了物理改性淀粉、增容剂等填充 PE塑料多组份共混体系的“夹心面包”模型和Al3 + 与淀粉间的配位络合物模型.[英文文摘]Physical modification with coupling agent of starch and the effect of the content of the modified starch on the phase structures and the mechanical properties of PE Plastics filled with starch was studied.It is suggested that the hydrophobic modified starch in the nature of good compatibility with L LDPE can be obtained when the amountof coupling agent is more the1 .0% .The layer bread model of the multicomponent blended system of PE plastics filled with physical modified starch,compatilizer and so on, and the coordination complex model between Al3+ and Starch were proposed
