查询词典 urea

Mono-calcium phosphate, sulfuric acid and urea were used for simulating the crystallization of calcium sulfate in the reaction of phosphate rock and urea-sulfuric acid.

结果表明，与无尿素的结晶过程相比，尿素使出现结晶的时间延长了150%，但悬浮液密度增加50%，结晶在长度和宽度上均有所增加，特别是宽度上的增长超过50%。

This experiment was designed to study the influence of various levels of urea, moisture and reaction time on the nutrition value of rice straw ammoniated, so as to determine the optimal parameters of urea, moisture and time of ammoniation .

中文摘要：本试验旨在研究尿素添加水平、水分含量、时间对氨化秸秆营养价值的影响，以确定氨化稻草秸秆尿素、水分、时间处理参数的优化组合。

In accordance with the principle of chemical dynamics, a new evaluation method for rate of ammonification of urea was established, and the type of reaction of ammonification of urea was confirmed.

根据化学反应动力学原理，建立了尿素氨化速度的评价方法，确定了尿素氨化反应的级数，测定了普通尿素、缓释尿素在特定条件下的氨化反应常数和半衰期，并依此评价了涂层缓释尿素的缓释性能。

However these troubles of concentrated urea liquor crystallizing and blocking pipe, as well as urea changing into biuret at high temperature should be avoided.

但在生产中要妥善解决尿素浓溶液易结晶堵塞管道以及尿素在高温下易生成缩二脲的问题

Examples of humectants include lactic acid, urea (the urea found in creams is synthetically produced by combining one molecule of carbon dioxide with two molecules of ammonia and not obtained from urine), hyaluronic acid (able to retain 1000 times its weight of water), propylene glycol, glycerin, sorbitol, gelatin, lecithin, sodium pyrrolidone carboxylic acid, and butylene glycol.

常见的湿润剂有乳酸，尿素（面霜里的尿素来自于二氧化碳和氨分子的合成而不是从尿中提取的），透明质酸（能保持自身成分1000倍的水分），丙二醇，丙三醇，山梨糖醇，明胶，卵磷脂，吡咯钠，羧基酸和丁二醇。

A new process,urea- calcium cyanamide method,for producing thiourea from urea and hydrogen sulfide is proposed.

利用尿素和硫化氢等原料制备硫脲，提出了尿素-氰氨化钙法新工艺。

Urea-cyanamide method: With different catalyst, under the condition of some temperature and time, urea and ammonia manufacture cyanamide under normal pressure.

尿素-氰胺法：使用改性分子筛做催化剂，在一定温度和停留时间等反应条件下，在氨气气氛中，使尿素在常压下脱水一步制备氰胺。

The disadvantage of ammonia and carbon dioxide- cyanamide method is the operation condition of this technology has very high request. Our team compares urea-cyanamide method with ammonia and carbon dioxide- cyanamide method, and then we get the conclusion: urea-cyanamide method is better than ammonia and carbon dioxide- cyanamide method.

为了比较两种新工艺的优劣，本课题组将两种工艺所得的收率，对环境的影响，催化剂，工艺条件，原料成本进行了比较，得出尿素-氰胺法优于氨气、二氧化碳-氰胺法的结论。

The urea easy to absorb moisture, when in the air relative humidity is bigger than the urea moisture absorption, it on absorption air in moisture content, but deliquescence.

尿素容易吸湿，当空气中的相对湿度大于尿素的吸湿点时，它就吸收空气中的水分而潮解。

At first, RNase A was denatured by urea and dithiothreitol. Effect of strong denaturant urea and DTT on enzyme activity and free thiol number was investigated.

首先利用脲和DTT作为变性剂，研究了脲和DTT浓度对RNase A的酶活和自由巯基的影响规律。

I didn't watch TV last night, because it .

昨晚我没有看电视，因为电视机坏了。

Since this year, in a lot of villages of Beijing, TV of elevator liquid crystal was removed.

今年以来，在北京的很多小区里，电梯液晶电视被撤了下来。