On the basis of the results of laboratory and field experiments the question is discussed on the technology of ionic bead welding, and wear-resistant alloy for valve body and valve cup, and the data of the experiments in oil fields are listed. The results of ...

本文通過(guò)室內(nèi)試驗(yàn)分析和現(xiàn)場(chǎng)試用情況論述了凡爾體和凡爾座堆焊耐磨合金及堆焊工藝方面的問(wèn)題99热网址，并列出了現(xiàn)場(chǎng)的試用數(shù)據(jù)，結(jié)果表明等離子焊的凡爾體和凡爾座的使用壽命有明顯提高。

The valve body and valve cup of mud pump are parts that are easily to be worn and broken. In order to increase the life-time of these parts, we studied the technology of increasing the life-time of valve body and valve cup by ionic welding.

泥漿泵的凡爾體和凡爾座是泥漿泵上的易損件，為了提高凡爾體和凡爾座的使用壽命国产毛片在线看，我們?cè)囼?yàn)研究了用等離子噴焊耐磨合金來(lái)提高凡爾體和凡爾座性能的工藝。

Ionic liquid ; Jatropha curcas oil ; biodiesel ; transesterification

離子液體黄片亚洲一区；麻瘋油国产A片址一网；生物柴油；酯交換

For some reasons, diaphragm process is still used in our country while ionic membrane process is widely used in advanced countries.

盡管發(fā)達(dá)國(guó)家已經(jīng)普遍采用離子膜法生產(chǎn)燒堿黄色网站国产精品，但在我國(guó)隔膜堿仍占主導(dǎo)地位亚洲sanji在线。

Non-ionic and low-osmolar contrast medium was used during coronary angiography and hemodialysis in one day before and after day operation.Using artery sheath as the artery end during hemodialysis and no supplemental heparin was used,the blood is beyond 200ml/min.

術(shù)中選用低滲性非離子型造影劑，于術(shù)前1日及術(shù)后當(dāng)日行血液透析毛片无限看，術(shù)后透析用動(dòng)脈鞘管做動(dòng)脈端美女黄色视频A毛片，血流量均在200ml/min以上，透析中未追加肝素可以免费观看黄色视频的网站，4例均無(wú)明顯滲血人人操人人上人人看，透析器及管路無(wú)凝血。

Dihydropyrimidin-2 (1H)-ones were synthesized by condensation of aromatic or aliphatic aldehydes, urea and ethyl acetoacetate or acetylacetone one-pot three-component Biginelli condensation in the presence of room temperature ionic liquids as catalysts under solvent-free conditions.

5利用室溫離子液體作催化劑男女猛烈无遮挡免费视频网站，芳香或脂肪醛亚洲国产精品国自产拍AV老女人、尿素和乙酰乙酸乙酯或乙酰丙酮三組分縮合制備3，4-二氫嘧啶-2-酮衍生物欧美肏屄a片。

This thesis includes two parts. The first part is study on hydroformylation of alkenes in ionic liquid-H2O system.

本論文分兩部分：咪唑離子液體—水體系中的烯烴氫甲酰化反應(yīng)研究和新型咪唑類手性季銨鹽的合成久久不卡亚洲精品国产精品。

In order to examine the influence of higher ionic strength on the interaction between QDs and avidin, the fluorescence spectra of free CdTe and CdTe-avidin solution are recorded as a function of increasing NaCl concentration.

實(shí)驗(yàn)還考察了鹽濃度對(duì)QDs-親和素體系的影響情況人人操人人摸性交精品，結(jié)果發(fā)現(xiàn)隨著鹽濃度的增大，QDs-親和素體系的熒光峰位逐漸藍(lán)移一级A片免费视频国产对白，而單獨(dú)量子點(diǎn)的熒光峰位基本不變一区二区三区激情欧美亚洲日本，這說(shuō)明鹽濃度的增加削弱了CdTe量子點(diǎn)與親和素分子之間的結(jié)合作用。

The calculated results show that azido in azides has linear structure , the most optimized CaN6 has linear structure , and the most optimized (CaN6)n (n=2～5) clusters have chain structure of perpendicularity of approximate diamond composed by two azido with two Ca atoms . The middle N atoms of azido show positive, the N atoms at both ends of azido show negative, and the N atoms effected with Ca atoms directly show more negative . There is strong ionic bond between the Ca and N atoms. The IR spectra of the most optimized (CaN6)n (n=1～5) clusters have four vibrational sections , the whole strongest vibrational peak lies in 2195～2280cm-1,and the vibrational mode is anti-symmetric stretching vibration of N-N bonds in azido . Stability analysis show that (CaN6)3 and (CaN6)5 clusters are more stable than other clusters .

結(jié)果表明日韩一级精品在线视频，疊氮化合物中疊氮基以直線型存在WWW囯产播放，CaN6團(tuán)簇的最穩(wěn)定結(jié)構(gòu)為線型結(jié)構(gòu)，(CaN6)n(n=2～5)團(tuán)簇首先由兩個(gè)疊氮基與兩個(gè)Ca原子構(gòu)成一個(gè)近似菱形日韩在线国内自拍视频网站，再由菱形相互垂直形成鏈狀最穩(wěn)定結(jié)構(gòu)国自产拍精品自拍；疊氮基中間的N原子顯示正電性，兩端的N原子顯示負(fù)電性，且與Ca直接作用的N原子負(fù)電性更強(qiáng)黄色在线三区，金屬Ca原子和N原子之間形成很強(qiáng)的離子鍵日本羞羞网站；(CaN6)n(n=1～5)團(tuán)簇最穩(wěn)定結(jié)構(gòu)的IR光譜分為4個(gè)部分，其最強(qiáng)振動(dòng)峰均位于2195～2280cm-1国产精品女人被喂j8，振動(dòng)模式為疊氮基中N-N鍵的反對(duì)稱伸縮振動(dòng)在线免费观看你懂的；穩(wěn)定性分析顯示，(CaN6)3和(CaN6)5團(tuán)簇相對(duì)于其他團(tuán)簇較為穩(wěn)定久久精品国产亚AV香蕉。

In this dissertation, the practical significance and the recent development of non-phosgene synthesis of N-substituted carbamates are reviewed briefly, as well as the application of ionic liquids in catalysis.

本論文綜述了非光氣合成N-取代氨基甲酸酯類化合物的現(xiàn)實(shí)意義和研究進(jìn)展日韩免费一级一欧美一级毛，以及離子液體在催化反應(yīng)中的應(yīng)用。