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oh基团
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  oh group
     The results showed thatthe OH group played an important role in the dispersion of MoO_3 on thesurface of support and that Ni and Co promotors apparently increased thedispersion of MoO_3 on the support.
     实验结果表明,MoO_3能很好地分散在催化剂表面上,而表面上的OH基团对这种分散起着重要的作用。 红外光谱也表明,助剂Co和Ni的加入对于促进MoO_3在表面上的分散起着一定作用。
短句来源
     As compared with B, the XPS spectrum for A after LTR had an extra shoulder at 553.5eV which could be assigned to surface OH group.
     A体系低温还原后的XPS较之B体系在533.5eV处多出了一个肩峰,可标识为表面OH基团
短句来源
     The mechanical properties of β-TCP/PLLA could be enhanced by modifyingβ-TCP surface with palmitic acid. XPS test prove that a -OH group has been formed between H+ of palmitic acid and [O] of PO43- inβ-TCP. This –OH group could form hydrogen bond with –C=O of PLLA, by which the mechanical properties of the composite could be reinforced.
     通过X光电子能谱(XPS)分析得知:棕榈酸的H+与β-TCP中PO43-的一个O之间形成了-OH基团,此基团能与PLLA的-C=O之间发生氢键结合,提高了复合材料的力学性能。
短句来源
     According to the principle of molecular spectroscopy, through analyzing, it has concluded that the fluorescence is generated by the transition of lone-pair electrons in –OH group in methanol molecule and the above property of the fluorescent spectrum is determined by electrons transition.
     根据分子光谱理论,经分析提出,该荧光是由甲醇分子中-OH基团的孤对电子跃迁产生的,荧光光谱的上述特性由电子的跃迁情况决定。
短句来源
     The bonding structure of laser-prepared nanometer a-SixNy:H powder and the bulk body prepared by pressing of powder are studied by IR and Raman spectroscopy. It is found that there are Si-N Si-Si, Si-H, N-H, Si-O-Si bonds and OH group in a-SixNy:H. The distortion of the spectra and the change of bonding structure of the bulk body before and after annealing are discussed.
     用红外吸收光谱和喇曼光谱对激光法制备的纳米a-Si_xN_y:H粉末及其加压成形块体的键结构进行研究,发现在a-Si_xN_y:H中存在着Si-N,Si-Si,Si-H,N-H,Si-O-Si及OH基团,讨论了块体及其退火后光谱畸变和键结构变化。
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  oh groups
     Influence of Si—OH groups on properties and avoidance for SiCOH films prepared by decamethylcyclopentasiloxane electron cyclotron resonance plasma
     Si—OH基团对SiCOH低k薄膜性能的影响与控制
短句来源
     This paper investigates the effect of Si—OH groups on dielectric property and leakage current of the SiCOH low dielectric constant films deposited by decamethylcyclopentasioxane (D5) electron cyclotron resonance plasma.
     研究了十甲基环五硅氧烷(D5)的电子回旋共振等离子体沉积的SiCOH薄膜中Si—OH基团对介电性能和漏电流的影响.
短句来源
     Protonic conducting P_2O_5-SiO_2 glasses were prepared by sol-gel processing. The heat history and microstructure of protonic conducting glasses were studied by DSC,XRD and FT-IR. The dependence of P_2O_5 content,temperature and OH groups on electrical conductivity were discussed.
     采用溶胶-凝胶法制备了P2O5-SiO2快质子导电玻璃,并借助DSC、XRD、FT-IR等测试手段分析了质子导电玻璃的热历史、微结构等,探讨了玻璃中磷含量、温度、OH基团对导电率的影响。
短句来源
     The decreasing of leakage current at high Si—OH content is due to the low connecting probability p of networks because the networks break at the terminal Si—OH groups.
     高Si—OH含量下漏电流的降低是由于封端的Si—OH基团降低了薄膜中Si—O网络的连通概率p而导致网络电导下降的缘故.
短句来源
     The results show that there exist a great deal of silicic acid sol with stable states during reaction when pH≤1.0.The hydrolysates and condensation polymers of silicic acid are obtained when pH=4.0,and the hydrogen bonds of Si-O and OH groups are formed in suitable rate,which can makes sol to gel with infirmness connection,reticulation and lower density,and surface area of silica powder is higher.
     研究结果表明,当pH≤1.0时,硅灰石与盐酸反应生成大量稳定的硅酸溶胶; 反应最终(pH=4.0)使硅酸水解和缩聚以及Si—O与OH基团氢键的形成以适宜的速度进行,形成弱交联、网状、低密度的硅酸凝胶,最终产物SiO2的比表面积增大。
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  “oh基团”译为未确定词的双语例句
     The dominate phase of iron oxide on IOCS was hematite (α-Fe2O3). OH- groups ,water molecule , Fe-OH and Fe-O band were also identified on FTIR spectra at 3439 cm-1 ,1630cm-1, 1067 cm-1and 537 cm-1, respectively.
     IOCS表面氧化铁的晶型为赤铁矿(α-Fe2O3),FTIR谱线在3439cm-1、1630cm-1、1067 cm-1、537 cm-1出现了吸收峰,分别代表氧化铁表面的OH、水分子、Fe-OH基团、Fe-O键。
短句来源
     FTIR spectroscopy shows that absorption bands at 3400cm-1 and 1635 cm-1 arise from OH and absorption bands at 998cm-1 came from Fe-OH in the solid PFS and PPFS.
     FTIR分析说明固体PFS和PPFS有3400cm~(-1)、1635cm~(-1)OH基团吸收峰和998cm~(-1) Fe-OH弯曲振动吸收峰。 XRD和FTIR实验结果证实PFS和PPFS含有羟基。
短句来源
     IR shows that the interaction of Li~+-O-Li~+ is weakened by the interaction between -OH from the surface of TiO_2 and PEO chain.
     IR分析表明TiO_2粒子表面的-OH基团与PEO的醚氧基团之间的相互作用削弱了醚氧基团与Li~+的络合作用。
短句来源
     Compare to direct alkali treatment, the composite bioactive treatment can result in the direct creation of more Ti-OH groups and the decrease in the amount of Ni_2O_3, Na_2TiO_3 and remnant NiTi phases.
     与碱液直接活化处理相比,复合活化处理可使试样表面的Ni含量更低,且Ti-OH基团显著增加,同时也减少了Ni_2O_3和Na_2TiO_3的含量。
短句来源
     When the powder was ball_milled with deioned water, its dispersibility was improved, with disappearing of isolated Si-OH and decreasing of the amount of Si-O-Si and Si-H.
     去离子水介质球磨的粉料 ,颗粒表面的Si—OH基团消失 ,Si—O—Si和Si—H基团数量减少 ,使粉料的悬浮特性有所提高 .
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  oh group
It is shown that 3-OH-SO is a multifunctional enzyme catalyzing oxidation of the 3β-OH group, Δ5 → Δ4 isomerization, and 6-hydroxylation.
      
It is shown that the change in the absorbance of the muscovite OH group band at 3620 cm-1 allows a calibration plot to be constructed for the determination of 1-90% muscovite.
      
The efficiency of inhibitors (τmax and Cmax) was demonstrated to rise with increasing extent of shielding of the OH group and shortening of the chain of a substituent in the para position.
      
These bands were identified as overtones 1 and 2 of the stretching vibrations of the OH group.
      
In the enzyme-substrate complexes, the Mg2+ ion is chelated by an Asp residue, coordinates two oxygen atoms of DNA, and stabilizes the transition state of the phosphate anion and 3"-OH group of the leaving nucleotide.
      
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  oh groups
The chondroitin-sulfate microenvironment made the enzyme resistant to heparin inhibition because the equatorial orientation of the OH groups is similar to that in hyaluronic acid.
      
The surface area of silica gel that is free of modifiers, as well as the number of vicinal and isolated OH groups are estimated.
      
It is established that hydrogen bonds between the NH2 groups of aminopropyl radical and isolated OH groups of silica gel are ruptured after the saturation of sorbent with water vapors at a relative pressure of about 0.5.
      
Based on adsorption data, it is concluded that the most of 3-aminopropyltriethoxysilane interacts with the isolated OH groups of silica gel with a stoichiometric coefficient equal to unity.
      
The grafted tridecylfluoroalkyl groups have a tilted orientation on the silica and physically screen the part of the surface OH groups that have not been involved in the reaction with a modifier.
      
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The title compounds are formed by the reaction of an o-diphenol group with an antimony atom and have,according to Causse,the characteristic■ linkage.Close observations made on these compounds revealed certain mistakes that had slipped into the literature.(1)Not as the conclusion drawn by Causse,only a few such antimonyl compounds(those from water soluble o-diphenols)may have the hydroxyl group on the antimony atom replaced by chlorine upon treatment with hydrochloric acid.We were unable to repeat the experiments...

The title compounds are formed by the reaction of an o-diphenol group with an antimony atom and have,according to Causse,the characteristic■ linkage.Close observations made on these compounds revealed certain mistakes that had slipped into the literature.(1)Not as the conclusion drawn by Causse,only a few such antimonyl compounds(those from water soluble o-diphenols)may have the hydroxyl group on the antimony atom replaced by chlorine upon treatment with hydrochloric acid.We were unable to repeat the experiments of Causse on such a conversion for antimonyl gallic acid and antimonyl methyl gallate.(2)The antimonydioxy linkage is unstable toward hydrochloric acid,especially more concentrated ones.All compounds having such a group may be converted back into the original o-diphonol by hydrochloric acid.This observation is contrary to those recorded by Christianson and Hunter.(3)The same linkage is also unstable toward alkali,which is also contrary to the observations made by Christiansen and Causse.(4)Nevertheless,all such antimonyl compounds may still be recrystallized for purification from hydrochloric acid within limits of concentrations which vary with the compound in question.If the acid is much diluted,the compound is normally insoluble,but if it is more concentrated,it is liable to effect complete hydrolysis.The concentration suitable for the recrystallization is somewhere between these two limits.Generally,for compounds prepared from water insoluble o-diphenols the range of acid concentration is very narrow whereas for those from water soluble ones,though the range is much wider,the percentage of the recovery from recrystallization,as shown by antimonyl catechol and antimonyl pyrogallol with constant 15 minutes boiling,decreases with the concentration of the acid used. It is experimentally possible in the gallic acid series to bring the value of antimony content closer to that required theoretically by the recrystallization process.(5)It has been found that the aeetoxyl group attached to the ring is completely hydrolyzed to give a phenolic group during the process of recrystallization.in the gallic acid series,the carboxylic ester or amide group may practically survive the hydrolytic effect though a minute decomposition may be detected by the color test with 5% sodium bicarbonate.(6)1-Acetylpyrogallol has been prepared according to the German patent and converted into its antimonyl derivative by means of antimony trichloride in absolute alcohol.Thereby the original acetylpyrogallol must contain 1-acetylated compound,if it is not wholly this.The position of the acetyl group was not montioned in the original report.(7)One 1:1 antimonyl compound has been prepared by the action of tartar emetic or sodium antimonyI tartrate on 3-acetylgallic acid.This confirms the structure for the gallic acid derivative as proposed by Lesser and Gad on the solo ground of the color reaction with ferric chloride.This is,however,contrary to the statement made by Christiansen that if the hydrogen atom of one of the hydroxyl groups in gallic acid is replaced by an organic residue,the phenolic compound will no longer react with sodium antimonyl tartrate to give an antimony derivative.(8)Contrary to the statements by Causse and by Christiansen,catechol has been found to yield antimonyl derivative by tartar emetic in a more concentrated solution.The failure to give a precipitate in a more diluted solution is ascribed to the solubilizing effect of the acid potassium tartrate formed in the reaction.From such a solution the antimonyl catechol may also be precipitated by means of adding sodium chloride.

对于含■Sb-OH 基团的1:1鄰二酚型氧锑化合物作了性能上的观察,并尝试利用这类化合物以作分离或证明鄰二酚类:(1)惟有个别的少数这类锑化合物(母体水溶性的),其锑上的羟基能经盐酸处理而为氯原子所取代,故不能作为普遍的事实,如 Causse 所肯定者。(2)酚型锑二氧键遇一定浓度以上的盐酸则显不安定。每一含这基团的氧锑化合物都能经盐酸处理而得回原来的鄰二酚,与一般认为对盐酸稳定之说不同(Christianson及 Hunter)。(3)酚型锑二氧键对硷也不稳定,与 Causse 及 Christians(?)n 的结果亦不同。(4)这类氧锑化合物仍一般都能为一定浓度的盐酸重结晶而达到纯化,惟分子中不能兼含有乙酰化酚基,因其能完全水解而脱去乙酰基,至酯基或酰胺基则大致无碍,虽然各该基团有些许水解。(5)曾从按照一德国专利所获得的产物中,分离出1-乙酰焦没食子酚锑,从而说明在该产物中至少含有1-乙酰焦没食子酚。(6)以吐酒石或酒石酸锑钠制得3-乙酰没食子酸的氧锑化合物,从而证实了 Lesser与 Gad 所拟的乙酰基位置,并且证明 Christiansen 的结论不确。(7)儿茶酚能与吐酒石成锑化合物,至其所以...

对于含■Sb-OH 基团的1:1鄰二酚型氧锑化合物作了性能上的观察,并尝试利用这类化合物以作分离或证明鄰二酚类:(1)惟有个别的少数这类锑化合物(母体水溶性的),其锑上的羟基能经盐酸处理而为氯原子所取代,故不能作为普遍的事实,如 Causse 所肯定者。(2)酚型锑二氧键遇一定浓度以上的盐酸则显不安定。每一含这基团的氧锑化合物都能经盐酸处理而得回原来的鄰二酚,与一般认为对盐酸稳定之说不同(Christianson及 Hunter)。(3)酚型锑二氧键对硷也不稳定,与 Causse 及 Christians(?)n 的结果亦不同。(4)这类氧锑化合物仍一般都能为一定浓度的盐酸重结晶而达到纯化,惟分子中不能兼含有乙酰化酚基,因其能完全水解而脱去乙酰基,至酯基或酰胺基则大致无碍,虽然各该基团有些许水解。(5)曾从按照一德国专利所获得的产物中,分离出1-乙酰焦没食子酚锑,从而说明在该产物中至少含有1-乙酰焦没食子酚。(6)以吐酒石或酒石酸锑钠制得3-乙酰没食子酸的氧锑化合物,从而证实了 Lesser与 Gad 所拟的乙酰基位置,并且证明 Christiansen 的结论不确。(7)儿茶酚能与吐酒石成锑化合物,至其所以不能在较稀的水溶液中析出,乃受反应产品酸性酒石酸钾的溶解影响,若加以食盐,亦能析出。

The dipole moments of trimethylsilanol,triphenylsilanol,dimethylsilandiol and diphenylsilandiol have been determined by the solution method in dioxane,and the results are 1.53,1.51,1.94,and 1.74D respectively.The experimental data were treated according to the method of Guggenheim.For comparison,the dipole moments were also evaluated according to the procedure of Halverstadt and Kumler which gave higher values than Guggenheim moments,and the deviation increases with the number of phenyl gioups in the molecule,apparently...

The dipole moments of trimethylsilanol,triphenylsilanol,dimethylsilandiol and diphenylsilandiol have been determined by the solution method in dioxane,and the results are 1.53,1.51,1.94,and 1.74D respectively.The experimental data were treated according to the method of Guggenheim.For comparison,the dipole moments were also evaluated according to the procedure of Halverstadt and Kumler which gave higher values than Guggenheim moments,and the deviation increases with the number of phenyl gioups in the molecule,apparently resulted from the noglect of atomic polarization.The dipole moment values obtained for the silanols are compared to those appeared in literature,supporting the measurement of Malatosta and Pizzotti,while in wide disagreement with the values reported by Grubb and Osthoff.The experimental results indicate that the internal rotation of two hydroxyl groups in the silandiols appears to be hindered and the preferred confi-guration of the silandiols shows an average angle between the vectors of two RSiOH group moments of ca.102°.

用溶液法测定三甲基羟基硅烷、三苯基羟基硅烷、二甲基二羟基硅烷和二苯基二羟基硅烷的偶极矩,实验数据按 Guggenheim 法计算得到的结果分别是1.53,1.51,1.94,1.74 D。与 Grubb-Osthoff 所给两种羟基硅烷的偶极矩值相差甚大。而 Malatesta-Pizzotti 的结果是与本工作的结果相协调的。偶极矩数据指出:在二羟基硅烷的结构中,两个羟基的内旋转是受阻的,其择优排布使两个 RSi-OH 基团极矩矢量间约成102°的夹角。

Fe-Y zeolite catalysts were prepared by excharging Na-Y and H-Y zeolites with ferrous ions or ferric ions. Ferrous ions can be gradually oxidized into ferric ions in the air. In order to examine the surface states and catalytic properties of these catalysts, the spectra of samples before and after reaction, dehydration, adsorption of reactants and water gas shift reaction at different temperatures were observed by means of Mossbauer spectroscopy. Preliminary theoretical calculations were made to ascertain the...

Fe-Y zeolite catalysts were prepared by excharging Na-Y and H-Y zeolites with ferrous ions or ferric ions. Ferrous ions can be gradually oxidized into ferric ions in the air. In order to examine the surface states and catalytic properties of these catalysts, the spectra of samples before and after reaction, dehydration, adsorption of reactants and water gas shift reaction at different temperatures were observed by means of Mossbauer spectroscopy. Preliminary theoretical calculations were made to ascertain the possible sites of the ferric ion in Y-zeolites. It was showed that both Fe3+ and Fe2+ had more than two different local environments. At room temperature, the preferential sites occupied by Fe3+ are S I' and SII', and by Fe2+ the S I 5 but at high temperature, iron ions are possibly located in SII and other sites of the supercage. During dehydration, part of the Fe3+ Is reduced into Fe2+ and a new species of high spin configuration with valence between Fe3+ and Fe2+ appears. Its possible model is Fe3+-O-Fe2+ and there is electron excharge between Fe3+ and Fe2+.Under real reaction conditions, the spectra reveal that there exists a similar doublet, its area is in relation to the activity for water-gas shift reaction. The Fe-Y catalysts can be more easily reduced after the adsorption of H2O and OH-groups.

采用Mossbauer谱学方法对Fe-Y沸石催化剂活性组成的价态、中间络合物的形成条件和水煤气变换反应进行了测试,并对Fe~+离子在Y沸石中的可能位置进行了初步理论计算。结果表明:Y沸石中的Fe~(3+)和Fe~(2+)离子均有两种以上不同的铁环境;抽空脱水时,部分Fe~(3+)被还原成Fe~(2+)并出现价态介于Fe~(3+)与Fe~(2+)之间的中间络合物,其可能模型是Fe~(3+)—O—Fe~(2+),桥连的两个铁离子之间电子云分布平均;实际反应条件下,也有类似表征过渡中间络合物的新物类出现;吸附和实际反应谱的分析指出:在有水和OH-基团存在下,CO吸附很容易使Fe~(3+)还原。

 
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