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Based on the Re-Os isochron method of molybdenites, this paper measured directly the ore-forming age from skarn ore in the Huangshaping deposit, and got a Re-Os age of (153.8±4.8)Ma, which is in accordance with the previous K-Ar age of 153~157 Ma obtained from phlogopite in the ore-bearing skarn of the deposit.

文章采用高精度的辉钼矿Re-Os等时线定年法,直接测得硅卡岩型矿体的矿化年龄为(153.8±4.8)Ma,与前人获得的含矿硅卡岩中金云母的K-Ar年龄(153~157Ma)一致。

C. Functionalization of [60]Fullerene with Vaporous Reagents via Its Calix[8] arene Complex Supramolacular complexes are applied widely in synthesis chemistry.

结果表明,它们均是有效的硅氢化催化剂,并具有某些独特的催化性能,如在催化苯乙烯的硅氢加成时,以高达85%-100%的区域选择性得到α-加成物。

The purification-pretreatment technique of 8 kinds of solid phase extracting column stuffing (silica gel, acid silica gel, Florisil, siliceous magnesium sorbent, Al2O3, celite 545, acid celite, Al2O3+silica gel) for the prepared polluted soil containing 13 kinds of organochlorine pesticides (α-HCH,β-HCH,γ-HCH,δ-HCH, o,p'-DDT, o,p'-DDE, p,p'-DDT, p,p'-DDD, p,p'-DDE, a-endosulfan, dieldrin, endrin, hexachlorobenzene) was screened prior.

用製备的8种固相萃取柱填料(硅胶,酸化硅胶,氟罗里硅土,硅镁型载体,Al2O3,硅藻土载体545,酸性硅藻土,Al2O3+硅胶)对含有13种有机氯农药的污染土壤的纯化预处理技术进行了优化筛选。

In the presence of alkalinity and tetraethyl ammonium bromide, 2,4-dihydroxy benzophenone reacts with allyl glycidyl ether to form an ethylenic derivative of benzophenone, 2-hydroxy-4-(β-hydroxy-γ-allyloxy) propyloxy benzophenone, which can further undergo hydrosilylation with polyhydromethylsiloxane.

在相转移催化剂四乙基溴化按作用下,利用2,4-二羟基二苯甲酮与烯丙基缩水甘油醚在碱性水溶液中的开环加成反应,合成了中间体4-丙氧基-2-羟基二苯甲酮,将其进一步与聚甲基氢硅氧烷进行硅氢化加成反应。

From our experimental results, the porous c-Si and porous microcrystalline silicon films have the same luminescence mechanism.

我们对晶体多孔硅和多孔化微晶硅两类样品的比较表明两者的发光机制是一致的。

Microelectromechanical system technology makes it possible the moralization and integration of the products based on the material of silicon.

电阻并联计算器电子工程师必备资料全集电路图电子百科电子元器件 LED技术课件下载 3G手机微电子机械系统技术的特点是可使制品微型化、集成化并以硅作为加工材料。

Three part of research works had been carried out in the dissertation. The first part: a kind of multidentate amine modified silica gel was synthesized through the following steps:(1) introduce the amino groups onto the surface of silica-gel by the treatment of surface silanol groups withγ-aminopropyl trimethoxy silane;(2) michael addition of excess trihydroxymethyl propyl triacrylate to amino groups on the silica gel surface;(3) amidation of the unreacted double bonds of TMPTA on the surface of TMPTA modified silica gel with diethylenetriamine;(4) the multidentate amine modified silica gel was finally obtained by the reaction of amino groups on the surface of DETA modified silica gel with double bond of butyl acrylate.

本论文进行了三部分研究工作,第一部分:通过多步反应对硅胶进行改性合成了一种多齿胺改性硅胶配体,合成过程如下:1通过γ-氨丙基三甲氧基硅烷与硅胶表面的硅羟基反应,使硅胶表面带有氨基;2利用硅胶表面氨基与过量的三羟甲基丙烷三丙烯酸酯发生Michael加成反应;3利用二乙烯三胺与TMPTA改性硅胶表面未反应的双键发生反应使硅胶表面氨基化;4最后用丙烯酸正丁酯与DETA改性硅胶表面氨基充分反应成功合多齿胺改性硅胶配体。

Finally the application of the homemade ODS for MSPD and the economical availability of the product was evaluated. Results show as the following: 1. It is a simple method for the preparation of a bonded octadecyl phase which has large particle and high extent of coverage of the bonded phase.

研究结果表明:①采用大粒径无定形硅胶为基质,选择十八烷基三氯硅烷为硅烷化试剂,完整地合成了一种大颗粒、高表面积的ODS键合相,合成的ODS可作为基质固相分散MSPD的固相分散剂,用于样品的前处理。

Therefore, it can attribute quality of passivation layer of SiN.

因此,可以全面的表征氮化硅钝化层质量。

A pair of FRET(frequency resonance energy transfer) donor-acceptor chromophores were simultaneously labeled on immunoglobulin G at varied ratios to prepare the spectroscopically encoded core materials,which were then housed inside a silica shell by the hydrolysis and polycondensation of tetraethoxysilane in water-in-oil microemulsion to synthesize the optically encoded silica nanomaterials.

采用两种FRET供受体荧光染料按不同的比例与载体材料人免疫球蛋白作用制备荧光编码的载体材料,以荧光编码的载体材料为内核材料,利用氨水催化硅烷化试剂在反相微乳液中水解包裹内核材料制备成一系列多色光学编码硅壳纳米材料。

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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