查询词典 dissolution

At present,the rate laws and reaction mechanisms of pyrite oxidation,pyrite and chalcopyrite formation,uraninite and magnetite dissolution in aqueous solutions are mainly studied,and it is discovered that (1)oxidation rate of pyrite controlled by surface reaction assume fractional dependence on Fe3+ and O2 molalities in acid solutions;(2)Pyrite cannot nucleate directly from solutions below 300 ℃,it can only form initially through sulfidation of a FeS precursor. The rate equation of reaction between FeS and H2S to form pyrite is of the second order;(3)Chalcopyrite is formed by reactions of pyrrhotite or pyrite with Cu2+,the former proceeds via a series of mediate metastable phases of Cu-Fe sulfide,whereas the rate equation of the latter is apparently of the first order which is controlled by surface reaction;(4)The nonlinear behavior of magnetite dissolution at acid pH can be represented by a shrinking core model coupling with surface reaction and diffusion transport.

目前主要研究了水溶液中黄铁矿氧化、黄铁矿和黄铜矿形成、晶质铀矿和磁铁矿溶解的速率定律和反应机理，发现：(1)酸性溶液中黄铁矿的氧化速率对Fe3+和O2浓度呈分数依赖并受表面反应的控制；(2)低于300 ℃时黄铁矿不能从溶液中直接成核，而需初始地通过FeS先驱物的硫化生成，FeS与H2S反应形成黄铁矿的速率方程为二级；(3)磁黄铁矿或黄铁矿与Cu2+反应均可形成黄铜矿，前者经历了一系列准稳的Cu-Fe硫化物的中间物，后者的速率方程为表观一级并受表面反应的控制；(4)酸性pH时磁铁矿的非线性溶解行为可采用表面反应扩散输运耦合的收缩核模型来描述。

The study revealed that: 1 chlorite occurred in vein, agglomerate or had the false pattern of biotite type, or the worm or bladed configuration; 2 Fe/Si diagram revealed mast of the chlorite occurred in the ferroamesite and aphrosiderite areas, few in the pycnochlorite area; 3 the formation temperature of chlorite varied from 179-276℃, mainly within the range of 230-260℃ as calculated by the empirical equation presented by Battaglia; 4 chlorite was formed in the reducing condition, the main formation mechanisms were dissolution-precipitation and dissolution-migration-precipitation.

研究表明：①岩石中绿泥石主要呈脉状、黑云母假象或团块状等产出，具有蠕虫状、叶片状等形貌特征；②绿泥石的Fe/Si图解显示201和361铀矿床中绿泥石主要为铁镁绿泥石和蠕绿泥石，少数属密绿泥石；③根据Battaglia提出的经验方程式计算了201和361铀矿床绿泥石的形成温度变化于179~276℃之间，且主要介于230~260℃之间；④绿泥石主要形成于还原环境，其主要的形成机制是溶解－沉淀和溶解－迁移－沉淀。

The oxidant 〓 plays indirect role in dissolving gold, and mainly controls the mix potential of Au in the alkaline thiourea solution. In which the "mix potential"is the decisive factor affecting the dissolution of gold. The reaction driving force is enough to have formamidine disulfide oxidize Au to Au〓 at the potential of about 0.4V. And then thiourea molecular complexes with Au〓 ion soon, which causes the fast dissolution of gold in the alkaline thiourea media. The dissolved weight of gold in 0.25 M thiourea solution with 0.05M Na〓SO〓 and 0.1M 〓 of pH 12. 5 by air at the temperature of 303K is 7. 8mg·cm〓 within 1hr.

在碱性硫脲溶金过程不起直接作用，而是通过S〓O〓来控制二硫甲脒有效形成的金在溶液中的混合电位；&混合电位&是影响碱性硫脲溶液溶金与否的决定性因素，在0.4V左右，有足够的推动力致使二硫甲脒氧化Au成Au〓，随后硫脲与Au〓络合形成稳定的络离子Au〓，从而使金快速溶解；温度为303K、pH为12.5时，在含0.05MNa〓SO〓、0.1M 〓及0.25M硫脲的溶液中，鼓入空气，金的溶解量在1hr内为7.8mg·cm〓；铜只有微量溶解，银、镍、铁则几乎不溶解。

Formic acid promotes the limestone dissolution extremely, as to reach a high dissolution rate in a short time.

甲酸添加剂可极大提高石灰石溶解速率，使石灰石在较短的时间内达到相当高的溶解率。

The study on dissolution rate and porosity of complete dissolution is important to investigae the solution mining mechanism of the difficult soluble glauberite.

溶解速率、溶解速度及溶解后孔隙率的研究对充分认识难溶性钙芒硝盐岩水溶开采机理有指导意义。

No entire nitrendipine crystals were observed visually in SEM photos. The results of X-ray diffraction and differential scanning calorimetry analysis indicated that the crystalline form of nitrendipine was highly dispersed in microspheres, so as amorphous state. The drug release rate of microspheres could be controlled with adjusting the ratio of solid dispersion carriers and retarding agents formulated. The agitation speed and temperature of the preparation process have distinct effect on micromeritic properties of microspheres. The release profiles of the microspheres were mainly affected by the stirring rate of paddle, the concentration of SDS and pH of dissolution medium. Cooling speed and time, however, have no evident influence on the drug release rate of the microspheres. The dissolution data showed that the mechanism of drug release from microsphers was mainly diffusion-controlled. The incorporation efficiencies of 3 batches sample were exceed 96. 8％, which implied that the current method was suitable for design sustained-release dosage form for poorly water-soluble drug.

在扫描电子显微镜下观察，在微球内外未发现尼群地平的完整结晶，X-射线粉末衍射和差示扫描量热试验结果也显示，尼群地平已经被高度分散在微球中；微球的释药速度可通过调整处方中固体分散体载体和阻滞剂的比例控制；制备温度和搅拌速度对微球的质量影响较大；溶出仪的搅拌速度，释放介质的浓度和pH对微球的释放有较大的影响；制备过程中的冷却速度和冷却时间对微球的释放行为影响不很明显；方程拟合的结果表明缓释微球的释药行为符合扩散机制；测定三批微球样品的包封率均在96.8％以上，表明该法适合于制备难溶性药物的缓释微球。

The medium-grained sandstones and medium-fine-grained sandstones form good reservoirs and the poststones medium reservoirs, while siltstones form poor reservoirs and pelitic siltstones poorest reservoirs. Sand bodies mostly develop in sand-flats, tidal channels and distributary channels of braided stream delta microfacies. The reservoir rocks of sand-flat and tidal channel are best with the physical property. Diagenesis such as compaction, cementation and dissolution has strongly reformed the reservoir rocks and the late dissolution has greatly improved their porosity and permeability.

中粒砂岩、中细粒砂岩属好储层，细粒砂岩属中等储层，粉细砂岩，粉砂岩属较差储层，而泥质粉砂岩则属差储层；砂坪、潮道和辫状河三角洲分流河道微相中的砂体最发育，它们决定了储集岩的发育、分布及原始物性条件；砂坪和潮道储集岩的物性最好，辫状河三角洲分流河道储集岩的物性次之，砂泥混合坪、辫状河三角洲分流河道间储集岩的物性较差；成岩作用对本区CⅠ油组的储层有强烈的改造作用，尤其是较晚期的溶蚀作用对岩石的储集性能有明显的改善，对本区CⅠ油组中孔高渗透储层的形成有很大的贡献。

He dissolution mechanism of α-TCP cement may be considered as dissolution and reprecipitation of defective calcium hydroxy-apatite hydrated from α-TCP.

CP骨水泥固化体在生理盐水中，溶解动力学方程为：y=-ln(1-x)=kt〓；溶解活化能为9.87kJ/mol，其机理是α-TCP水化形成的缺钙羟基磷灰石溶解再沉积的过程。

Abstract］ Objective To observe the therapeutic value of ansepidermal dissolution of the nucleus pulposus by O3 under the spiral CT.Methods One hundred and sixteen patients approved to be protrusion of lumbar intervertable by CT or MR,and comporting ache of the small of the back and lower limbs,were treated by dissolution of the nucleas pulposas under the spiral CT.

目的 探讨螺旋CT引导下经皮穿刺臭氧髓核溶解术治疗腰椎间盘突出症的价值方法 116例患者经CT或MRI检查证实腰椎间盘突出症，均表现为腰背部疼痛及下肢麻痛，在CT的引导下行臭氧髓核溶解术治疗。

The organism cleared the dust by means of dissolution, enwrapping, winding or in the way of biochemical dissolution, and the fibre became shortened, broken, bifurcated, ends-rounded, and also it could dissolve, transfer and chemically react on surface.

机体以吞噬、包裹、缠绕，或以生化溶解方式排解粉尘，纤维自身则出现变短、尖部圆化、折断、分叉现象，也可以溶解、迁移、表面化学反应等。

Further more, the simplified analysis method on stressed-skin effect of corrugated steel sheet is also discussed in detail.

此外还比较详细地探讨了蒙皮效应的简化分析方法。

If I had known her telephone number,I would have called her.

要是我知道她的电话号码，我就打电话给她了。