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Typical error employing eight: province of small sums, Ben semiconvergence

典型错误用人观念八:省小钱,亏大本

Chiral 3 methy 1,4 butanediol and its derivatives are the important intermediate of synthesis of chiral smectic liquid crystal polyesters and chiral natrual products with biological activity. In the paper, a new efficient route of 3 methyl 1,4 butanediol and its two derivatives, 2 methyl 4 tetrapyranyloxy 1 butanol and 2 methyl 4 tetrapyranylbutanal, was described, and the target products were synthesized by employing asymmetric hydroboration oxidation improved.

手性2-甲基-1,4-丁二醇及其衍生物是合成各种手性近晶型液晶材料以及手性天然生物活性物质的重要中间体,以3-甲基-3-丁烯-1-醇为原料利用改进的不对称硼氢化-氧化反应,成功地合成了-2-甲基-1,4-丁二醇以及其2种手性衍生物:-2-甲基-4-四氢吡喃氧基-1-醇和-2-甲基-4-四氢吡喃氧基丁醛。

In this paper, a procedure of nonlinear analysis of the cable-stayed bridge was developed based on the nonlinear theory of structures using the finite element method, in which the vehicle-bridge interaction element based on the concept of dynamic condensation is used. The influence of vehicles on the response of the cable-stayed bridge is studied by employing the spung mass model and the bridge model with and without considering cable vibration modes.

本文拟应用非线性力学分析程序与有限元素数值计算法,建立斜张桥的非线性分析程序,应用VBI的车桥互制元素配合动态浓缩的观念,以悬浮移动质量模拟车体对斜张桥的影响,并对考虑与不考虑缆索振动模态两种分析模型,做一对应分析比较。

Stine thus reaches a similar conclusion to Sosa's, though without employing the technical modal machinery that Sosa adduces.

我们应该获得的结论是,因为这样的怀疑论假说情况确实是模态上遥远的,于是无关的,于是我们知道对它们的拒绝(在我们知道某东西的意义上)于是闭合原则保留下来。

By employing the method that shuts each subcircuit,the paper analyzes and compares the hydraulic stability of direct return system and reverse return system.

采用依次关闭各支路,然后计算未关闭支路流量的方法,分析和对比异程系统与同程系统的稳定性。

Employing the MOS_leve1_8 spice model, the proposed IGBT subcircuit model which is fully spice compatible gives more simulation accuracy and easy convergence.

使用SPICE MOS-LEVEL-8模型,确保模型计算的精确性和收敛性及与SPICE软件的兼容性。

With an actual gymnasium of a long-span spatial steel-cable-membrane hybrid structure as the cal- culation model,both static and dynamic analyses were performed by employing the global analysis for the whole hybrid structure,and the substructural analysis for the truss arch substructure,and the cable-membrane substructure etc.,and the stresses and displacements of structural members were compared during global and substructural analyses.

在复杂的混合结构体系中,结构形态呈三维状态,在荷载作用下具有三维受力特征并呈空间工作',,〕,结构之间的相互作用越来越不直观。同时,由于一些大跨度空间结构中包含了柔性部分,使结构的几何非线性行为成为必须考虑的因素,从而结构构件的内力改变与边界条件、荷载的变化关系就更加难以估计。

Employing th e on-line measured data,off-line teste d data and fuzzy logic reasoning ,this model can be used to on-line evaluate the condition of equipment and estimate the value de-preciation by ageing or f.

根据设备在线测量和离线测试的数据,采用模糊逻辑推理方法,在线评估设备状态及其价值跌落。

The reaction of metallic tin with nitric acid was investigated in the presence of different types of technical surface active agents employing the thermometric method as developed by Shams El-din for evaluating the inhibition efficiency of different surfactants.

研究了有各类工业用表面活性剂存在条件下金属锡与硝酸的反应,采用Shams El-din建立的测温法评估不同表面活性剂的缓蚀效率。

Benzoylated phenyl a - and B - 2 - thio - D - fructofuranosides were synthesized and coupled with protected sucrose acceptor to synthesize a - D - fructofuranoside - linkage stereospecifically by employing NIS/AgOTf as catalysts.

在果糖的合成研究中,合成了四苯甲酰基苯基果糖硫苷,并首次将其用作糖苷化反应的给体,在NIS/AgOTf的促进之下,与乙酰化保护的蔗糖受体反应,从而以高产率立体专一地合成了α构型的呋喃果糖苷。

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The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应,而且减少跟风的可能性。

The new PS20 solar power tower collected sunlight through mirrors known as "heliostats" to produce steam that is converted into electricity by a turbine in Sanlucar la Mayor, Spain, Wednesday.

聚光:照片上是建在西班牙桑路卡拉马尤城的一座新型PS20塔式太阳能电站。被称为&日光反射装置&的镜子将太阳光反射到主塔,然后用聚集的热量产生蒸汽进而通过涡轮机转化为电力