共查询到20条相似文献，搜索用时 359 毫秒
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聂莉娜 《南通师范学院学报》2001,17(3):70-74
人类绝大多数和社会活动是由言语一塌糊涂控制，控效是话语修辞的实质，从控制论的角度去观察，话语信息的控效方式可从不同角度划分；有直接控制和间接控制；积极控制和消极控制；正反馈控制和负反馈控制；顺向反馈控制与逆向反馈控制；前反馈控制与后反馈控制等，话语修辞控效行为的实施，必须遵行及时适度性原则和协调优化性原则。 相似文献
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本文对月季切花品种的选择提出了一些基本原则，并初步筛选了一些适合作切花的月季品种。在月季切花的保鲜技术方面，主要从以下四个方面进行了研究和探讨：（一）月季切花的采收时间和方法；（二）采收后的前处理技术；（三）冷藏技术；（四）后处理技术。 相似文献
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采用插层法制备了苯酚阴离子柱撑的水滑石,并采用球-壳结构对水滑石进行了表面处理,通过TEM表征,经表面处理后的水滑石粒径分布均匀,更有利于无机粉体在有机树脂基体中的分散.通过DMA表征,表面处理后的球-壳结构水滑石,耐热性能比初级粒子有显著性提高,可作为一种新型结构性超分子自组装功能材料. 相似文献
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目的:探讨归芪五味消毒饮联合抗生素预防关节置换术后感染的临床疗效。方法:2015年10月至2020年10月收治200例关节置换患者,其中全髋关节置换50例,人工股骨头置换80例,全膝关节置换40例,膝关节单髁置换30例,每种病例随机分成2组,一组为观察组,另一组为对照组。所有患者常规应用抗生素,同时观察组于术后第1d开始口服归芪五味消毒饮,每天1剂,连用5d。分别于手术前、术后1、5d抽静脉测定C反应蛋白(CRP)、血测白细胞数量(WBC)、红细胞沉降率(ESR)。同时随访观察患者的切口愈合情况。结果:观察组和对照组手术前和手术后第1d后的CRP、WBC计数、ESR比较,差异均无统计学意义。术后1d的CRP、WBC计数、ESR均高于术前和术后5d(对照表1、2、3)。术后第5天两组之间的CRP、WBC计数、ESR比较,差异均有统计学意义。术后观察组均未发生感染,切口均愈合良好,对照组4例切口浅表感染,伤口延迟愈合。观察组切口愈合时间(13±3)d,对照组切口愈合时间(16±4)d。结论:归芪五味消毒饮联合抗生素可明显改善血液炎性指标,预防关节置换术后感染。 相似文献
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高寒地区地广人稀，电力及其他形式能源供给落后．为保障高寒地区水处理设备在低温环境下正常运行，对其保温技术作了研究．首先对布置于水处理模拟设备上的柔性管路及其排列间距进行了研究；其次，以石蜡作为储能材料，分析了柔性管路套管结构中，储能层的储热性能；最后对储能层与设备之间，储能层与外围结构之间的隔热性能进行了研究．实验结果表明，在环境温度-20℃条件下，水处理设备与储能层之间形成了温度梯度，设备内部保持在8℃左右的时间为5～7 d，保证设备水温能工作在正常温度状态，储能层向外界扩散的热损失较少，可满足低温环境下水处理设备的防冻需求． 相似文献
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材料准备：材料：水槽、玻璃水杯、硬纸片过程：1、水杯装满水（不留空间）；2、硬纸片盖住水杯；3、用手按紧纸片，满满地将水杯倒过来（杯口朝下）；4、轻轻移开按住纸片的手，此时纸片不下掉，水不流出。原理：杯中装满水，其中的空气被排尽，纸片密封杯口后，外部大气压对纸片的压力大于杯内水对纸片的压力，因此纸片不会下掉， 相似文献
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林国富 《宁德师专学报(自然科学版)》2007,19(2):145-147
厚大体积混凝土施工技术要求高，难度大，要采取严密可先行技术措施，来保证工程质量．着重说明减少水化热控制混凝土内外温度差．避免混凝土出现贯穿裂缝和施工缝的方法． 相似文献
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邱崇丙 《唐山师范学院学报》2014,(1):21-23
汉字的六书,《说文》对“转注”一类,语焉不详。后世学者提及转注,也仅限于许慎所举出的例字。《汉字例说》一文,作者从转注的角度综合考虑,对部分现代常用字作了分析,跟传统的解释有所不同。希望能抛砖引玉,互相切磋,以推进学术研究。 相似文献
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《海外英语》2007,(5):10-11
Many college freshmen arrive woefully unprepared to do college work, and as disadvantaged populations continue to grow, the share of the American work force that has made it through college is expected to plummet. Many experts blame that educational failure not just on high schools but also on colleges. School & College, a special report by The Chronicle, looks at efforts to fix the system. What reforms would better prepare students for college? What should schools and colleges be doing differently? How should state and federal officials help? 相似文献
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Rachel Zupek 《海外英语》2007,(11):40-41
我们绝大部分人都同意一件事情——我们喜欢金钱。但是你对金钱的喜欢之情足够到让你创立一份事业么?.财富通常被人忽视,主要在于人们不能真正了 相似文献
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《海外英语》2007,(4):36
There are numbers of crossroads on our long and unpredictable life journey where we totally have no idea about which direction to choose. No matter what our decision is, we should not turn back, but face the music and go ahead instead. I am this kind of girl who always does try without regretting, one example is how I dealt with my love. 相似文献
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YANGShiguo 《重庆大学学报(英文版)》2004,3(1):86-88
The problem on the geometrc inequalities involving an n-dimensional simplex and its inscribed simplex is studied. Aninequality is established, which reveals that the difference between the squared circumradius of the n-dimensional simplex andthe squared distance between its circumcenter and barycenter times the squared circumradius of its inscribed simplex is not lessthan the 2(n-1)th power of n times its squared inradius, and is equal to when the simplex is regular and its inscribed siplex is atangent point one. Deduction from this inequality reaches a generalization of n-dimensional Euler inequality indicating that thecircumradius of the simplex is not less than the n-fold inradius. Another inequality is derived to present the relationship betweenthe circumradius of the n-dimensional simplex and the circumradius and inradius of its pedal simplex. 相似文献
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Migration occurs behind a variety of reasons and has a great effect on the whole world. People may migrate in order to improve their economic situation, or in order to escape civil strife, persecution, and environmental disasters. The impact of migration is complex, bringing both benefits anddisadvantages. This paper briefly talks about the causes of migration, the allocation of benefits, and the ways in which individual countries and the international community deal with this important subject. 相似文献
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GUO Bao-feng Xiao Da-wei 《重庆大学学报(英文版)》2005,4(3):129-133
Using virtual reality for interactive design gives a designer an intuitive vision of a design and allows the designer to achieve a viable, optimal solution in a timely manner. The article discusses the process of making the Virtual Reality System of the Humble Administrator＇s Garden. Translating building data to the Virtual Reality Modeling Language （VRML） is by far unsatisfactory. This creates a challenge for computer designers to do optimization to meet requirements. Five different approaches to optimize models have been presented in this paper. The other methods are to optimize VRML and to reduce the file size. This is done by keeping polygon counts to a minimum and by applying such techniques as object culling and level-ofdetail switching. 相似文献