甲壳素衍生物对烟草抗菌活性影响的研究

研究了不同浓度，不同种类酸溶解和不同脱乙酰度的壳聚糖以及水溶解羧甲基壳聚糖对烟草中主要霉菌的抑菌活性，以及它们对烟丝内在质量，焦油，烟碱等的影响。结果表明：酸溶解壳聚糖和水溶解羧甲基壳聚糖对烟草霉变微生物均具有抑制作用，醋酸溶解的壳聚糖较水溶解的羧甲基壳聚糖效果好，水溶解的羧甲基壳聚糖较柠檬酸溶解的壳聚糖效果好，且随壳聚糖脱乙酰度的升高，抑菌作用增强，使烟草内在品质有所改善，其主流烟气焦油，烟碱释放量也略有降低。     

钾光卤石溶解动力学

研究了钾光卤石在不同分解液及不同温度的溶解机制，建立了溶解及结晶动力学方程     

ICP-AES法测定高温质子导体中的五种元素

研究用ICP-AES法测定高温质子导体中的钡、铈、锶、钇和镱，选定了适宜的溶解方法及分析条件，在溶解酸中加入盐酸羟胺，获得了较为满意的分析结果，相对标准差小于10%。     

EDTA滴定法快速测定铅基合金中铅

铅基轴承合金因为磨擦阻力小、贴服性优良、铸造性能好等优点广泛用于中小负荷机械设备的轴瓦上。然而铅基合金在用酸溶解、稀释时极易产生沉淀，给分析带来困难。铅基试样的溶解是铅基各元素分析的关键。本文着重研究了用盐酸-硝酸混合酸溶解试样，加入一定量氯化钠防止铅析出，     

冶金炉料中二氧化硅和碳化硅的联合测定

提出冶金炉料中二氧化硅及碳化硅的联合测定方法，硝酸－氢氟酸－盐酸溶解二氧化硅，用硅氟酸钾容量法测定，残渣经焦硫酸钾溶解杂质，不溶碳化硅以重量法测定，经试样全分析及精密度考证，方法简便、可靠．     

用于气体分离的新型耦合膜分离方法及装置

本发明涉及气体分离方法及装置，用于气体分离的新型耦合膜分离方法，原料气体经多个分离单元进行分离，每个分离单元原料气体首先与一侧的气体分离膜接触，能与载体溶液形成配体通过促进传递的气体组分首先在与之接触的气体分离膜内溶解扩散，然后与载体溶液形成配体结构以促进传递形式通过薄层载体溶液与另一侧气体分离膜接触，通过在该气体分离膜内的溶解扩散在渗透侧解吸；原料气中不能与载体溶液形成配体的气体组分首先在与之接触的气体分离膜内溶解扩散，然后在薄层载体溶液中以溶解扩散的形式与另一侧气体分离膜接触，通过在该气体分离膜内的溶解扩散在渗透侧解吸，达到分离原料气体的目的。本发明分离方法既满足气体高压分离要求，杜绝塑性效应，又防止膜的润湿和泄露，维持长期的稳定性。     

In3+与Ga3+对纯铝在KOH溶液中电化学行为的影响

通过极化曲线、交流阻抗的方法研究了纯给在1mol·L－1KOH溶液中的电化学行为，分析了铝在碱性介质中活性溶解时的特殊动力学现象．通过溶液中添加金属离子In3十和Ga3＋，研究了高析氢过电位金属离子对纯铝在KOH溶液中阳极溶解过程的影响机制，并结合扫描电镜照片（SEM）证明了In3十和Ga3十对铝电极溶解的影响过程．     

汞(Ⅱ)与氨水生成的沉淀的溶解性

通过实验设计了二价汞与氨水反应生成的沉淀过量氨水中的溶解性，提出了ＮＨ３－ＮＨ４ＮＯ３溶液中二价汞与氨生成可溶性配合物使沉淀溶解，而Ｃｌ＾－的存在不利于沉淀的溶解。     

主链含硅聚芳酯的合成及气体透过性能的研究

以双［对－酰氯苯基］二甲基硅烷和酚酞、四溴酚酞以及双酚Ａ为原料，合成了三种主链含硅聚芳酯，并对聚合物相关的物理性质进行了表征，制成了均质透明的薄膜．采用低真空法测定这些聚合物对Ｈ２、Ｏ２、Ｎ２、ＣＯ２、ＣＨ４的气体透过速率，并计算出气体透过系数、扩散系数、溶解系数、分离系数．从气体透过性能与聚合物分子结构关系的角度，按照气体透过的溶解－扩散机制，对聚合物的气体透过性能进行了研究，而且着重讨论了聚合物的堆积密度对气体扩散系数的影响，以及聚合物主链中极性链段的百分含量对气体溶解系数和溶解选择性的影响。     

重组人干扰素—γ的凝胶色谱分离及其变性剂对分离结果的影响

使用十二烷基硫酸钠，盐酸胍和尿素三种不同的变性剂溶解基因重组人干扰素－Ｇａｍｍａ（ｒ－ＩＦＮ－γ）包含体，然后进行凝胶色谱分离。使用活性，电泳和高效疏水作用色谱三种方法，比较了三种变性剂对分离结果的影响，结果为：尿素溶解包含体后ｒ－ＩＦＮ－γ的分子量与杂质相差较大，盐酸胍溶解液经分离后ｒ－ＩＦＮ－γ比活最高，ＳＤＳ对ｒ－ＩＦＮ－γ的构象影响较大。     

Constant composition dissolution of mixed phases. II. Selective dissolution of calcium phosphates

Characterization of the dissolution kinetics of individual synthetic and biological calcium phosphates is of considerable importance since these phases often coexist in biological minerals. The constant composition method has been used to study the dissolution kinetics of a series of synthetic calcium phosphates, brushite (DCPD), beta-tricalcium phosphate (TCP), octacalcium phosphate (OCP), hydroxyapatite (HAP), and carbonated apatite (CAP) in the presence and absence of citric acid, as a function of pH and thermodynamic driving force. While citric acid markedly accelerates the dissolution of TCP, HAP dissolution is significantly inhibited. Moreover, this additive has almost no influence on the dissolution of DCPD, OCP, and CAP. Dual constant composition dissolution studies of mixed calcium phosphates in the presence of citric acid have also been made. Another factor, pH, also plays an important role in the dissolution of these calcium phosphates. In suspensions of calcium phosphate mixtures, specific phases can be selectively dissolved by changing experimental parameters such as pH and the presence of rate modifiers. This result has important applications for the dissolution control of dental hard tissues such as dentin, enamel, and calculus.     

The leaching kinetics of brannerite ore in sulfate solutions with iron(III)

A kinetic study of the leaching of powdered brannerite ore by sulfuric acid has been investigated. The effects of stirring speed ranging from 100 to 1,000?min^?1, particle size ranging from 20 to 120???m, concentration of Fe(III) ranging from 0.0025 to 0.20?M, acid concentration ranging from 0.1 to 2.0?M and temperature ranging from 15 to 90?°C on uranium dissolution are reported. The dissolution rate was founded to be significantly influenced by the temperature and concentration of the acid in solution. The experimental data for the dissolution rates of uranium have been analyzed with the shrinking-core model for reaction control. The apparent activation energy for the dissolution of uranium has been evaluated using the Arrhenius expression.     

New convenient dissolution of iron-rhodium alloys using hydrochloric acid containing a small amount of nitric acid without heating for an ICP-AES analysis.

A new convenient dissolution method for Fe-Rh alloys has been developed. Aqua regia has been used for the dissolution of rhodium alloy samples. However, it is difficult to dissolve high-concentration rhodium (more than 50 mass%) in aqua regia, because a rhodium-passivity on the alloys surface occurs with nitric acid. By using hydrochloric acid containing a small volume of nitric acid, Fe-Rh (24-64 mass%) alloys could be completely decomposed and dissolved under mild experimental conditions. The principal advantages of this method are simplicity and time-saving compared with other dissolution methods.     

Transpassive dissolution mechanism of ferrous alloys in phosphoric acid/acetic acid mixtures

The transpassive dissolution of Fe-12%Cr and Fe-25%Cr alloys in near-anhydrous phosphoric acid/acetic acid mixtures has been studied by conventional voltammetry and electrochemical impedance spectroscopy. Both steady-state and transient techniques point to two parallel pathways for the process involving oxidative dissolution of Cr as Cr(VI) and isovalent dissolution of Fe most probably mediated by an electrolyte-originating species. A simplified kinetic model of the process including only surface kinetic steps has been found to reproduce successfully both the steady-state and the small-amplitude AC response of the studied materials. The kinetic parameters of the model are determined and their relevance regarding the influence of the alloy and electrolyte composition on the relative importance of the two parallel pathways is discussed. The experimental data and model calculations indicate that the effect of acetic acid on the reaction steps related to dissolution of Fe is more significant.     

Phase-field modeling of solute precipitation and dissolution

A phase-field approach to the dynamics of liquid-solid interfaces that evolve due to precipitation and/or dissolution is presented. For the purpose of illustration and comparison with other methods, phase-field simulations were carried out assuming first order reaction (dissolution/precipitation) kinetics. In contrast to solidification processes controlled by a temperature field that is continuous across the solid/liquid interface (with a discontinuous temperature gradient), precipitation/dissolution is controlled by a solute concentration field that is discontinuous at the solid/liquid interface. The sharp-interface asymptotic analysis of the phase-field equations for solidification [A. Karma and W.-J. Rappel, Phys. Rev. E 57, 4323 (1998)] has been modified for precipitation/dissolution processes to demonstrate that the phase-field equations converge to the proper sharp-interface limit. The mathematical model has been validated for a one-dimensional precipitation/dissolution problem by comparison with the analytical solution.     

化学溶解和电感耦合等离子体质谱法研究地质样品中铂族元素的物相分布

建立了基于化学逐级溶解、火试金预浓集和电感耦合等离子体质谱分析的地质样品中铂族元素的物相分析新流程。应用逐级溶解，地质样品可被分成即水溶相、可交换相、碳酸盐相、Ｆｅ／Ｎｉ金属相、硫化物相、氧化物相、硅酸盐相和残渣相８个组分。详细研究了溶解实验中试剂、温度、酸度和时间等实验参数。作为应用的实例，研究了丹麦Ｓｔｅｖｎｓ Ｋｌｉｎｔ Ｋ／Ｔ界线样品中５个铂族元素的物相分布。     

The active dissolution of tin in concentrated alkaline solution

The active dissolution of tin in alkaline solution has been studied using both rotating disc and impedance techniques. The dissolution reaction has an anodic Tafel slope of ～57 mV/decade after diffusion effects are eliminated. The order of reaction with respect to OH^? has been found to be ～2 by both techniques and is compatible with the suggested reaction mechanism involving quasi-reversible charge transfer with a following chemical reaction to form stannite ions.     

Dissolution behavior of highly burnt fuel

In order to study the dissolution behavior of a highly burnt LWR fuel, a fuel pin irradiated in the DR3 test reactor in Risoe National Laboratory, has been characterized by microstructural examination and then dissolved under PUREX type conditions. The dissolution behavior was investigated and the residues analyzed by scanning electron microscopy and by ICP-MS and IDMS after dissolution.     

Etudes calorimetriques en milieu solvant organique. V. Enthalpies de dissolution de l'alanate de sodium,NaAlH4, dans le tetrahydrofuranne

The enthalpies of dissolution of sodium tetrahydridoaluminate NaAlH₄ in THF have been determined for different concentrations. The enthalpies of dissolution and dilution are exothermic from 1 to 7 · 10^?3 M. The enthalpy of dissolution at infinite dilution has been calculated: ΔH^∝_diss = ?6.38 kcal mole^?1.     

Solubility and thermodynamics of dissolution of helium in water at gas partial pressures of 0.1–100 MPa within a temperature range of 278–353 K

The tables of recommended numerical values for the water solubility of helium at gas partial pressures of 0.1–100 MPa within a temperature range of 278.15–353.15 K are given. The thermodynamic characteristics of dissolution of helium in water at the mentioned parameters of state have been calculated. The independence of the dissolution enthalpy on the pressure has been recognized and explained.