| 1. | Hemihydrate can be used instead of gypsum .
半水物硫酸钙可以用来代替石膏。
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| 2. | Excessively high temperature causes formation of hemihydrate .
过高温度导致生成半水物。
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| 3. | An organic wetting agent or foam suppressant is quite helpful in the formation of filterable hemihydrate .
某种有机的润湿剂或消泡剂十分有助于形成可过滤的半水物。
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| 4. | Para - hydrazinobenzenesulfonic acid hemihydrate
对-肼苯基磺酸水合物
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| 5. | Standard specification for high purity calcium sulfate hemihydrate or dihydrate for surgical implants
外科植入物用高纯度硫酸钙半水合物或二水合物的标准规范
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| 6. | Safety and biocompatibility of citrated calcium sulphate hemihydrate as substitute of bone transplantation
柠檬酸化半水硫酸钙作为骨移植替代材料的安全性及生物相容性评价
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| 7. | Hi this thesis , the setting time of various retarders had been tested , in which three retarders with good retarding action , citric acid , sodium tripolyphosphate , bone glue are respectively chosen from three types of retarders , hydroxyl carboxylic acid type , phosphate type and protein type , and the strength and setting time of gypsum added with them are determined . effect of some factors , such as ph value , fineness of hemihydrate , type of gypsum on the retarding action of the retarders is also studied
本文对多种缓凝剂进行凝结时间测试，选择效果良好的羟基羧酸、无机盐和蛋白质类型的三种缓凝剂：柠檬酸、多聚磷酸钠和骨胶，测定它们对石膏凝结时间、强度等宏观性能的影响，并分别研究ph值、石膏细度和石膏种类等因素对它们的缓凝效果的影响。
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| 8. | Through the analyzing the macro - structure to micro - structure , the author considers that retarding mechanism of citric acid is that citric acid and ca in the gypsum form the complexant ion , and hinder the crystallization center of dihydrate crystal bigger ; that of sodium tripolyphosphate is that it combined with ca , hinders the dissolve of hemihydrate . formation and growth of crystallization center ; that of bone glue is the glue - protection and chemical absorption action of active group , which also retards the formation and growth of crystallization center
通过宏观到微观的分析，笔者认为，柠檬酸的缓凝作用的原因主要在于柠檬酸与钙形成络合离子，影响了二水石膏晶体的晶核长大过程；多聚磷酸钠与钙形成某种复盐，对于石膏晶体的溶解、成核和长大过程均有强烈的阻碍影响；骨胶则在于胶体对半水石膏的包裹和活性基团的化学吸附，使二水石膏晶体的成核和长大困难。
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