结晶

The crystallizability and solution properties of polyacrylate depressants and their depressive effects on two waxy oils were studied. It was found that the crystallizability of PA depended on the length of its side chain and molecular weight. Gel was observed in the concentrated solution, The temperature of gelation, which was a measure of the crystallizability of PA in solution, was higher for the PA itself with stronger crystallizability.

对聚丙烯酸长链酯的结晶能力和溶液性质及其对两种含蜡油的降凝效果进行了研究，发现PA的结晶能力取决于PA侧链长度和相对分子质量，而其在溶液中形成冻胶或沉淀的温度（反映PA在溶液中的结晶能力）与PA本体的结晶能力有关，而PA对含蜡油的降凝效果则与PA在油中的结晶能力有关。

During the cold crystallizing process, when PBT component was above 20%, the existence of PBT promoted the cold crystallizability of the blends. While during the melt crystallizing process, the addition of a second component restrained the crystallization of the system.

在冷结晶过程中，当PBT含量超过20%时，将促进体系的结晶性能；而在熔融结晶过程中，第二组分的加入抑制了体系的结晶性能，当配比为50/50时，结晶速率相对最低。

The potash fertilizer synthesized using desiliconized slag and potassium carbonate is discussed, as well as the influences of the amount of potassium oxide as main raw material and its heating temperature, holding time and cooling mode and amounts of other oxides added on its crystallizability.

以铁水脱硅渣和碳酸钾为原料合成钾肥，利用X射线衍射对钾肥试样的结晶性能进行了分析；考察了氧化钾加入量，加热温度，保温时间，冷却方式以及氧化物添加种类对合成钾肥结晶性能的影响·研究结果表明，利用铁水脱硅渣和碳酸钾为原料可以合成钾肥；合成的钾肥由含钾结晶相Ca1 917K0 166SiO4，非含钾结晶相Ca2SiO4和含钾非结晶相组成；在本研究条件下，各种因素对合成钾肥的结晶性能没有明显影响

Bamboo first crystallizes then lignifies during bamboo shoot growth and basically forms crystal structure in one month. 1-year-old bamboo culm ends growth and its height,thickness, volume almost change little, but culm tissue is small and tender and there is more water and less substance in it. Bamboo crystal proportion keeps invariable during this period.2-year-old bamboo culm begin to lignify,its cellulose proportion debases and its crystal proportion decreases. Bamboo lignin debases, crystal proportion changes a little in the end of this period.Many-old-year bamboo culm crystal proportion is almost invariable. Freaky bamboo cell wall crystal region's thickness is less than normal bamboo's. Bamboo cross section crystal area and the ratio of long axis to short axis are less than normal bamboo's,and roundness,irregular index, the fiber cap density per unit area increase more than normal bamboo's.

竹笋生长阶段是先结晶后木素化的过程，一个月内细胞壁结晶组织基本形成；2）一年生竹材的植株秆茎生长结束，秆茎的高度、粗度和体积变化不大，但秆茎的组织幼嫩，含水量高，干物质少，竹材结晶度基本不变；3）二年生竹材的植株开始木质化，纤维素比例降低，结晶度减少，到后期竹子木质化降低，竹材结晶度变化不大；4）多年生竹材的结晶度没有太大的变化，结晶度大小处于波动状态；5）畸形竹材纤维帽细胞壁结晶区的厚度比正常竹小，其横截面结晶区的面积、纤维帽长轴与短轴比有所减少，而圆形度、异型指数有所加大，单位面积纤维帽的密度增大。

ABSTRACT The decomposition temperature and heat of cefazolin sodium pentahydrate were measured by the differential scanning calorimetry technique.

在溶液结晶过程中结晶物系的物理化学性质(如溶解度、熔解热、介稳区等)对结晶操作、结晶收率、产品纯度和产品的粒度分布均有较大影响，结晶物系的热力学性质是结晶动力学和结晶工艺研究的基础。

ABSTRACT The decomposition temperature and heat of cefazolin sodium pentahydrate were measured by the differential scanning calorimetry technique. Its solubility data in various mixed solvents of water ethanol, water acetone, and water 2 propanol were obtained by the laser method and fitted by the exponential model.

在溶液结晶过程中结晶物系的物理化学性质(如溶解度、熔解热、介稳区等)对结晶操作、结晶收率、产品纯度和产品的粒度分布均有较大影响，结晶物系的热力学性质是结晶动力学和结晶工艺研究的基础。

ABSTRACT The decomposition temperature and heat of cefazolin sodium pentahydrate were measured by the differential scanning calorimetry technique. Its solubility data in various mixed solvents of waterethanol, wateracetone, and water2propanol were obtained by the laser method and fitted by the exponential model.

在溶液结晶过程中结晶物系的物理化学性质(如溶解度、熔解热、介稳区等)对结晶操作、结晶收率、产品纯度和产品的粒度分布均有较大影响，结晶物系的热力学性质是结晶动力学和结晶工艺研究的基础。

Crystallization thermodynamics of cefazolin sodium pentahydrate ABSTRACT The decomposition temperature and heat of cefazolin sodium pentahydrate were measured by the differential scanning calorimetry technique.

在溶液结晶过程中结晶物系的物理化学性质(如溶解度、熔解热、介稳区等)对结晶操作、结晶收率、产品纯度和产品的粒度分布均有较大影响，结晶物系的热力学性质是结晶动力学和结晶工艺研究的基础。

The molecular motion of amorphous region at high-frequency was found to be hardly affected during the stretching processes. In summary, elongation has created major but different influences on the morphology and molecular motion of the aforementioned four series of polymeric elastomers. For those elastomers like natural rubber and poly , elongation has induced crystallization of the noncrystalline or the soft segments. The crytallinitiy and the crystal thicknesses increase monotonously during the course of the stretching; On the other hand, the stretching processes for those semicrytalline copolymers like EMA and POE are rather complex, including the formation of crystal at relatively low λand the destruction of the crystal at the utmost λ. It revealed that stretching process has resulted in a decreasing of the thicknesses and a shortening of 〓C T〓s for the orthorhombic crystalline components.

拉伸对上述四个弹性体体系的聚集态结构都产生了很大影响，但是影响的程度和内容因体系而不同，对于本身存在着化学交联或者是物理交联的体系而言，拉伸导致了其中本来难以结晶组分的结晶，且结晶度随着拉伸比增加而增加，与此同时，体系结晶的晶片厚度也会逐渐增加；而对于结晶性共聚物体系，如EMA和POE，结晶区本来起到了物理交联的作用，在这种情况下拉伸的影响变得比较复杂，拉伸对于不同晶型的影响有所不同，在拉伸比较低的情况下体系总体的结晶度会有所增加，说明有新的结晶产生，当接近或达到断裂伸长比时，体系的结晶度会突然降低，含量占优的结晶会被拉伸所破坏，含量较低的结晶在整个拉伸过程中受的影响较小。

A method for making Bisphenol A with a purity of more than 99.7% by reacting phenol and acetone using an acid catalyst, separating a BPA-phenol adduct by crystallisation and removing phenol from the adduct, in which involves continuous suspension crystallisation with a total dwell time of more than 4 hours in at least 3 crystallisers, by cooling first to 50-70 C in two parallel crystallisers and then to 40-50 C in a third crystalliser connected in series with the first two.; A method for the production of Bisphenol A with a purity of more than 99.7%, by reacting phenol with acetone in presence of an acid catalyst, separating a BPA-phenol adduct from the product mixture by crystallisation, filtration and washing, and removing the phenol from the adduct, in which stage involves continuous suspension crystallisation in at least three crystallisers connected in such a way that the mixture is first cooled to 50-70 C in two crystallisers in parallel and then cooled to 40-50 C in a third crystalliser in series with the first two, the total residence time of the mixture over all crystallisers being more than 4 hours.

描述用于生产纯度大于99.7％的双酚例如，双酚A(BPA的方法，这种方法包含苯酚和丙酮在有酸性催化剂参与的情况下反应形成一个包含双酚的产物混合物；通过结晶、过滤和洗涤从该产物混合物中以双酚/苯酚复合物的形式除去至少一部分双酚以提供双酚A/苯酚复合物晶体；并且从双酚/苯酚复合物晶体中除去至少一部分的苯酚以提供纯度大于99.7％的双酚；其中结晶过程包括连续的混悬液结晶，并且是在至少三个结晶装置中进行的，装置的排列使得产物混合物首先在结晶过程的第一阶段在第一个结晶装置和并联的第二个结晶装置中被冷却到50至70℃的温度，随后在结晶过程的第二阶段在与第一和第二个结晶装置下游串联的第三个结晶装置中被冷却到40至50℃的温度，并且其中产物混合物在结晶过程中的总驻留时间在4小时以上。

Fancy gold-plated dangling earrings with facetted White Opal crystals.

花式镀金悬垂耳环与facetted白欧泊水晶。

This essay chooses the study aim from biology teachers in middle school in Shi Jiazhuang which tells us that most of the middle school biology teachers in Shi Jiazhuang have the"burnout", lower successfulness, individualize.

本文选取石家庄市初中生物教师作为研究对象，运用问卷调查的方法对石家庄市初中生物教师职业倦怠的现状进行调查，调查结果发现，石家庄市初中生物教师这一群体普遍存在职业倦怠，情感枯竭程度偏高，成就感偏低，去个性化程度最为严重。