查询词典 pipe coupling

Expanding pinacol reductive coupling reaction into asymmetric one with both diastereoselectivity and enantioselectivity may lead to its application in synthesising medicaments and biologic active compounds with structure of vicinal diol. Asymmetric pinacol coupling reaction is also the most compact and effecient method in synthesizing chiral ligands or chiral auxiliary with C〓 symmetry.

将这一反应发展成为既有高度的非对映选择性，又有高度对映选择性的不对称偶联反应在合成许多含有手性邻二醇结构的药物或生物活性物质将有更重要的应用，同时不对称Piancol偶联反应也是合成C〓对称性的邻二醇多用途手性配体或手性助剂的最为简捷有效的方法。

Then the cyclocarbonylation of propargylic alcohols under the catalysis of Pd 〓 with CuBr〓 and BQ was studied. Due to the high activity the yields of -α-bromoalkylidene-β-lactones were lower than that of -α-chloroalkylidene-β-lactones while the coupling reaction of -α-bromoalkylidene-β-1actones (i. e. Sonogashira and Suzuki coupling reaction) was quite smooth to afford the products in high yields.

接着我们研究了炔丙醇在Pd〓-CuBr〓-BQ催化体系下的羰基插入环化反应，由于-α-溴代亚烷基-β-内酯环化合物的活性高于-α-氯代亚烷基-β-内酯环化合物，导致反应收率偏低，而同样基于此原因，-α-溴代亚烷基-β-内酯环化合物的偶联反应进行得很顺利，而且收率很高。

Since the presence of a out coupling hole alters the transverse structure of the intra cavity light in a FEL oscillator ,the finite element method is used to the optical field equations and a good proximation is made for the out coupling process in the mirror,and then some numerical results are given.

针对孔耦合波导自由电子激光振荡器腔内光场横向特性，应用有限元法于慢变光场方程，并对输出腔镜上孔耦合过程加以较准确的描述，而后通过对数值结果的分析比较，说明这一模拟方法较好地描述了孔耦合引起的腔内光场横向结构的变化发展特性，改善了模拟结果。

Identification System have two components the Reader machine and the Responser card: the Reader machine is made up of PT2272, coupling coil, buzzer and composition; Responser card is made up of SC2262, coupling coil, switch for code.

系统由阅读器与应答器两部分组成：阅读器由PT2272、耦合线圈、发光二极管等组成；应答器由SC2262、耦合线圈、拨码开关等组成。

Magnetic coupling is a new kind of coupling,which connects motor and machine by permanent magnetic force.They work in the sealless magnetic drive pumps,which transporting volatile,flammable,explosive and toxic solutions with no leakage.

它无须直接的机械联接，而是利用稀土永磁体之间的相互作用，利用磁场可穿透一定的空间距离和物质材料的特性，进行机械能量的传送。

The aseismatic design method of complicated multitower coupling framework is analyzed according to the seismal dynamic corresponding characteristics of multi-tower coupling framework with the sample of Beijing New Poly plaza.

结合北京新保利大厦项目，基于复杂多塔连体结构的地震动力响应特点，深入分析了多塔连体结构的抗震设计方法。

The experimental results showed that the modified efficiency of titanate coupling agent A was the highest, and of silicane coupling agentwas 3 was the lowest.

实验说明钛酸酯偶联剂A的改性效果最好，硅烷偶联剂3的改性效果最差。

And on the fundamental composition of the foundry waste sand/waste agricultural film, we decided the optimum quantity of the silicane coupling and titanate coupling was 1.5%~2%.

在废砂／废地膜基本配方一定的情况下，确定硅烷偶联剂和钛酸酯偶联剂的最佳改性用量为1.5％～2％。

In order to enhance the miscibility between the inorganic and the organic phases,the silanol coupling agent is made from the slane VTMS and the colloid silica. Then the silanol coupling agent and nano-particles of ZnSb2O6 as the conductive filler are successfully bonded and the nano-particles of ZnSb2O6 will become more organic-like. The colloid silane-SiO2-ZnSb2O6 precursor solution is subsequently mixed with a homogeneous lsopropylalcohol solution of SR-399 acrylic monomers (Dipentaerythritol pentaacrylate) and the active free radical agent709. Under nitrogen purging, this reaction solution prepolymerize at 60℃. Then, the solution is spin-coated with the spin coator at room temperature. At last, the coated thin film is cured and crosslinked by the UV curing reactor to form the highly transparent thin film with good optoelectronic properties from hybrid organic-inorganic nano-composite.

首先以矽氧烷VTMS和colloid silica制备矽氧偶合剂，再以此偶合剂对分散於异丙醇溶液之奈米级的colloid ZnSb2O6做有机化改质，以增进其与有机高分子基材的键结相容性，我们将此colloid silane-SiO2 - ZnSb2O6前驱物与SR-399有机基材单体(Dipentaerythritol pentaacrylate)的异丙醇溶液与活性自由基光起始剂709均匀掺混后，在充满氮气反应系统下，加热至60℃进行预聚合反应，接著在室温下以旋转涂布机旋转涂布成厚度均匀薄膜，最后将此薄膜直接高温硬化或以UV硬化机网状键结硬化成透明与具部份导电性等光电特性之无机/有机奈米混成薄膜。

This paper gives a brief introduction to the fundamental theory and working process of uncabled depth measuring device. When using this system the depth time function is recorded above ground, coupling time function is done under well and the depth coupling function is got from functional exchange.

简要介绍了无缆深度检测装置的基本原理和工作过程，该系统由地面记录深度—时间函数，井下记录接箍—时间函数，经过函数变换得到深度—接箍函数，然后利用前磁、油管深度资料对接箍深度进行校正，从而可以得到井下仪器准确的位置，解决了基础试井深度监测中由于人为因素、机械因素等造成的深度记录误差。

Must have Coordination and negotiation skill, flexible ideas, and be punctilious person.

必须具备较好的协调与谈判能力，头脑灵活，工作认真仔细

Result: 18 patients are all with simple eye.The pigment mole lies in nasal and temple sides of the ball conjunctiva,in which 2 lie in lacrimal caruncle and semilunar plica.

结果：18例患者均为单眼，色素痣大多数位于内外侧睑裂部球结膜面，2例位于泪阜及半月皱襞，经激光治疗后，10例色素痣消失，有5例行再次激光后消失，2例行第三次激光后消失，1例第四次激光后消失。