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The human cartilages are composed of chondrocyte and extracellular matrix , the form of chondrocytes are hypertrophy and the quantity are less; the ECM of cartilage are compised of type Ⅱ collagen and proteoglycan. Articular cartilages are all hyaline with little fibers. Trauma and arthritis are the main cause of cartilage injury, the ommilayer injury ofcartilage can be recovered by marrow, but because of without stimulation mechanism, the new tissues are merely fibrocartilages, they can not be coincide with hyaline cartilage in menchanics; the purely damage of articular cartilage can not stimulate chondrocyte to regenerate because of without blood circulation, thus, the plerosis of articular catilage can not depend on the proliferation of local chondrocyte. Ever since, people tried their best to find a way to reconstruct articular cartilage.

中文题名人骨髓基质干细胞成软骨诱导及多孔复合材料作为细胞载体的体外实验研究副题名外文题名 Cartilage induction of human mesenchymal stem cells and experiment on compound porous materials as cells' scaffold in vitro 论文作者刘晓岚导师周江南学科专业外科学研究领域\研究方向学位级别博士学位授予单位中南大学学位授予日期2003 论文页码总数68页关键词骨组织工程软骨细胞骨髓基质干细胞壳聚糖高分子外消旋聚乳酸馆藏号BSLW /2003 /R68 /10 造成人体关节软骨损伤的原因主要为创伤和关节炎,关节软骨全层损伤可由于骨髓中间充质干细胞的高速增殖修复,但这种修复由于缺乏相应的刺激机制,只能形成纤维软骨,而不能形成符合关节生理、力学要求的透明软骨;单纯软骨部分损伤软骨组织内无血管,软骨细胞迁移迟缓,无法使损伤区域软骨细胞再生,因此,关节炎及关节创伤后的软骨修复不能依赖于软骨细胞的增殖和迁移。

All materials must be available to others. This means that commercial sources must be identified, proprietory materials must be patented prior to publication, and all cultures, strains or varieties on which the work is based must be deposited in an identified culture collection from which they can be obtained by others.

那个实验当然可以重复,不过每个实验都有它必要的条件,这个实验的条件首先就是要有相信实验可以成功的人,因为心念是有力量的可以改变水的微观结构,其实当年很多关于气功的实验已经多次证明了,只是后来被不理智的抹煞了。

Secondly, referring to the present study on the connotation of the medium-income group and its measurement of dividing, the paper puts forward the basis and method of the sexenary division of the citizens and defines of the medium-income group as a group of people whose income is just lower than the millionaire and billionaire, Similar to the "middle class" popular in the western countries in economy and politics. As tar as the measurement is concerned, the paper sets up the measurement considering both the quality and quantity on the basis of income. From the point of view of quality, the medium-incomes should be able to pay for the real estate, life-lone education, medical care and luxurious goods all or mostly by their personal income, inheritance or loan form banks. In addition, they should be capable of keeping their income rising steadily.

其次,结合当前学术界对中等收入者的内涵及其划分标准的研究现状,本文提出城乡居民六等分的依据和方法,将本文研究视野中的中等收入者概括为一类仅次于亿万富翁和百万富翁的高收入者,在经济特征上,类似于西方世界流行的&中产阶级&;在其划分标准上,确立了以收入作为划分不同群体的依据,衡量标准采用质与量相结合的方法,从质上看,中等收入者的收入应能全部或绝大部分通过借贷、继承等方式支付房产、教育、医疗、高档消费等支出,并具有可持续增长的收入能力。

The result studying is indicated: Develop the approach making use of tradition home village sports resource to be that improving rural area middle and primary school sports educational quality\\\s is effective actively , be also to improve important rural area middle and primary school sports quality of teaching act; Need to deepen the reform of sports of rural area middle and primary school course , ought to lead into more tradition sports projects entering rural area middle and primary school; Build the tradition sports resource warehouse; Strengthen directing on tradition sports propagating, atmosphere building campus tradition sports culture actively; Bring due tradition sports resource advantage into play, elasticity and local characteristic embodying rural area sports; Embody tradition sports culture knowledge moves the technical ability Smriti , the tradition sports ability , emotion and cultivate and fine outlook on values psychological traits cultivate; Embody the healthy actual effect and student movement interest looking at and appraising an unification.

研究结果表明:积极开发利用传统乡土体育资源是提高农村中小学体育教育质量的有效途径,也是提高农村中小学体育教学质量的重要举措;要深化农村中小学的体育课程改革,应该引入更多的传统体育项目进入农村中小学;建立传统体育资源库;加大对传统体育的宣传力度,积极营造校园传统体育文化氛围;发挥传统体育资源应有的优势,体现农村体育的弹性和地方特色;体现传统体育文化知识运动技能的传承,传统体育能力、情感及价值观的培养和良好心理品质培养;体现健康的实效性与学生运动兴趣相统一。

Time are the important period that the Chinese is versed in crystal develops, on base of long-term practice job, in Lu Jia stannic gentleman is based on structural property concern to explore guidance of thinking of science of new crystal material to fall, structural institute discovered material of Fujian of the Chinese Academy of Sciences to be judged to be ascend by foreign journal early or late.

80年代是中国人工晶体发展的重要时期,在长期实践工作基础上,在卢嘉锡先生基于结构性质关系探索新晶体材料学术思想指导下,中国科学院福建物质结构研究所先后发现了被国外刊物评为跻。。。

Do not count on this keyword to be able to be brought to you how old discharge, if you can be made the most concise, do not take the keyword of any suffixal languages, that should be not talked additionally.

不要指望这个关键词能给你带来多大流量,如果你能作到最简洁,不带任何后缀语言的关键词,那就另当别论了。

The studies was proceeded on the the supercritical CO2 extraction technique of rotenone from Tephrosia vogelii. The extraction influences of technology conditions were systematically groped, The research results were listed as follows:1 The analysis method applied in this paper has been proved to be suitable to technology research of the studies on the SC-CO: extraction technique of rotenone from Tephrosia vogelii. 3 indexes, extraction ratio of rotenone. extraction ratio of total compounds and rotenone content percent in total compounds weight, were carried out with HPLC quantitatively determination combined with the sample weight loss after extraction. With these 3 indexes. The extraction influences of technology conditions were evaluated by synthesis. Then the best technology conditions were ascertained for different extraction aims.2 The pretreatment of rough material should be needed before extraction. Comminuting the material to 0.28mm size is most fit to SC-CO: extraction.3 Firstly static extracting 20 min then turn to dynamic doing is the better extraction mode than other ones.4 The orthogonal experiment was conduct with 3 factors and 5 levers.

本论文通过对非洲山毛豆SC-CO_2萃取中影响萃取效果的工艺条件的研究,初步得出如下结果:(1)本论文中所采用的萃取效果评价方法适宜于非洲山毛豆中鱼藤酮的超临界流体萃取技术研究,该方法具体为:HPLC定量分析非洲山毛豆SC-CO_2萃取物中的鱼藤酮含量,再结合萃取前后处理样品的重量损失,得出鱼藤酮萃取率、萃取所得粗物质萃取率和粗物质中鱼藤酮含量三个参数,以此三个指标综合评价萃取条件对萃取效果的影响;(2)通过对原料粒度对萃取效果影响的研究,结果表明SC-CO_2萃取非洲山毛豆复叶中的鱼藤酮,原料粉碎成30目粒度叶粉时萃取效果较好;(3)通过对萃取方式与萃取效果之间关系的研究,结果表明SC-CO_2萃取非洲山毛豆中鱼藤酮应采用先静态后动态的萃取方式,静态萃取时间为20min;(4)通过温度、压力和CO_2流量三因素五水平的正交试验,结果表明温度是最主要的影响因素,压力因素对鱼藤酮萃取率的影响程度高于CO_2流量,而对于粗物质萃取率和粗物质中鱼藤酮含量CO_2流量因素高于压力。

The holistic design of the system and resolved the designs of software and hardware based on VXI bus are put forward according to the demand of test system. The hardware and software is designed, including the formation and design of hardware system, visual instrument software architecture, program design for instrument driver, high speed real-time data collection. In the dynamic test program, the idea of"software is instrument"was applied to meet the diverse test demands. Last, it is proposed that the VXI test system be developed to more totalization and networked. The basic theory of system identification was introduced briefly at first. The principle of spectrum analysis system identification based on Wiener-Hopf equation was expatiated. and the questions in applying Peusdo Random signal as spectrum analysis methods stimulate signal was studied, The generation principle of the peusdo random signal is researched, the characteristic of peusdo random are analyzed from time domain and frequency domain, the inverse repeat peusdo random signal is brought forward to make up the shortage of ordinary peusdo random signal. And a new chaos genetic algorithmis presented to solve the unprecise problem of the traditional method. In the servo valve dynamic characteristic test system, the spectrum analysis methods was applied successfully, the servo valve dynamic characteristic could be acquired rapidly and exactly, the test results were analyzed and the ameliorate methods were brought forward at last.

结合航天某集团液压测试中心测试系统的需求,提出了基于VXI总线的液压测试系统的整体设计方案,完成了测试系统的硬件设计与软件设计,包括硬件系统构成与设计、虚拟仪器软件结构、仪器驱动程序设计、高速同步实时数据采集等内容;以伺服阀动态特性测试为例设计了测试模块,该模块体现了VXI总线仪器软件开发所倡导的&虚拟仪器&的思想,以软件的灵活应用满足了不同的测试需求;结合自动测试系统的发展,研究了VXI测试系统与网络技术结合,实现各种软硬件资源共享,进一步提高设备及数据的利用率和系统的扩展性,使自动测试向综合化、网络化方向发展;研究了伪随机信号作为谱分析法辨识的激励信号时存在的问题,讨论了伪随机信号的产生机理,从频域和时域分析了伪随机信号的性质及其应用,提出了用逆重复伪随机信号弥补了普通伪随机信号的不足,并以混沌遗传算法对逆重复伪随机信号产生过程中的参数进行优化,可以更合理而不是凭经验产生需要的逆重复伪随机信号。

This method is tectonic on foundation of nuclear function theory special and linear space, each issue of rank nucleus of progression of the Volterra that seek solution changeover uses output observation vector to be in to beg Xierbaite the some in the space child the umbriferous problem on the space, make originally complex, hard calculative is nonlinear in the approachs a problem to be built in place compose linear space of Volterra progression of the system solve ably with the means that accumulates inside vector, gave out specific algorithm.

该方法在核函数理论基础上构造非凡线性空间,将求解Volterra级数的各阶核的新问题转换为求用输出观测向量在希尔伯特空间中某一子空间上的投影新问题,使原本复杂、难以计算的非线性系统的Volterra级数的逼近新问题在所构建的线性空间中巧妙地以向量内积的方式解决,并给出了具体算法。

Nevertheless, without going into the minutiae of the business, the eloquent fact remained that the sea was there in all its glory and in the natural course of things somebody or other had to sail on it and fly in the face of providence though it merely went to show how people usually contrived to load that sort of onus on to the other fellow like the hell idea and the lottery and insurance which were run on identically the same lines so that for that very reason if no other lifeboat Sunday was a highly laudable institution to which the public at large, no matter where living inland or seaside, as the case might be, having it brought home to them like that should extend its gratitude also to the harbourmasters and coastguard service who had to man the rigging and push off and out amid the elements whatever the season when duty called Ireland expects that every man and so on and sometimes had a terrible time of it in the wintertime not forgetting the Irish lights, Kish and others, liable to capsize at any moment, rounding which he once with his daughter had experienced some remarkably choppy, not to say stormy, weather.

尽管如此,即使不细微地进行调查,大海依然光辉灿烂地存在着这一雄辩的事实终归是无法否定的。一般总会有人大胆地违悖天意,继续航行。不过,这也仅仅表示人们通常是怎样挖空心思把此类重担转嫁给旁人。比方说,地狱这个观念也罢,彩票和保险也罢,都是同一性质的,因此,单凭这个理由,&救生艇星期日&这一组织也是值得嘉许的。广大公众不论住在内地还是海边,一旦清楚地了解了,就应该感谢水上警察署长和沿岸警备队克尽职责。因为不论什么季节,爱尔兰期待每人今天各尽自己的职责等等。冬季有时天气恶劣,也非出发不可。他们得安排人去管缆绳,不要忘了那些爱尔兰灯船,基什的,还有旁的。随时都有可能翻船。有一次他带着女儿乘船绕过它航行。虽然还说不上是狂风暴雨的天气,倒也饱尝了恶浪翻滚的滋味。

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She gently rebuff ed him, but agreed that they could be friends

她婉言拒绝了,但同意作为朋友相处。

If in the penal farm, you were sure to be criticized.

要是在劳改农场,你等着挨绳子吧!

Several theories about reigniting and extinguishing of the arc have been refered.

本文综合考虑了几种电弧重燃和熄灭理论。