碱度

The principle of alkalinity measurement and control,software and hardware design were discussed in detail.

介绍了碱度检测原理、碱度控制原理、监控系统的硬件电路设计和软件编程，并给出了应用实例。

Light calcium carbonate was usually manufactured by chemical process, so its high alkalinity eould not be avoided easily.

由于轻质碳酸钙都是化学法生产，碱度高不易避免，而且轻质碳酸钙的生产原料质量直接影响其碱度。

In this paper, in order to solve the high alkalinity problem caused by low quality raw material, a kind of built low grade polymer at dry powder and solution state respectively was used to reduce the alkalinity of light calcium carbonate.

结果表明：采用该复配低聚物溶液可有效地降低轻钙碱度，提高产品质量并不影响生产工艺难度、复杂度和周期，为降低轻钙碱度提供了新的途径。

The effect of the form(including individual,complex and complex proportion),the dose of graphite,carbon black,carborundum and the alkalinity of base slag on the melting speed were studied.

以石墨、炭黑、碳化硅等三种含碳材料和碱度分别为0.8、1.0和1.2的基渣为原料，研究了炭黑、石墨和SiC加入形式(单独或复合，包括复合时的比例)和加入量以及基渣的碱度等因素对保护渣熔化速度的影响，并对试验数据进行了多元线性回归分析。

Effects of slag basicity,Al 2O 3 content and temperatue on reduction of chromite in slag by solid carbon have been studied.

考察了渣碱度、渣中Al2O3含量以及温度对铬矿被固体碳还原反应的影响，得到渣碱度在0。

Using these diagrams, thermodynamic analysis is carried out to show the effect of technical conditions on soda decomposition of scheelite. It appears that the concentration of has direct effect on soda decomposition of scheelite. When the alkalinity is low, will hydrolyze to , accordingly the decomposition rate of scheelite becomes lower because of the decrease of . So in order to get higher leaching rate in industry practice, it is necessary to use enough amount of soda to serve as digestion reagent and, certain amount of NaOH to maintain high enough alkalinity.

利用这些热力学平衡图对Na2CO3分解白钨矿的工艺条件进行了分析，认为溶液中浓度直接影响白钨矿分解，而当碱度较低时，Na2CO3将水解生成，从而降低浓度，进而降低白钨矿的分解率；故在工业实践中，为使钨最大限度地转入溶液，除了保证足够的Na2CO3用量，还必需添加NaOH以维持一定碱度。

Under a certain condition, there is negative correlation between the LC50 values of pH and those of Alk to black rockfish fingerling.

可见pH一定时，随着Alk的增大，碱度对鱼的致死作用也越大；随着受试时间的延长，碱度对鱼类的毒性作用也越来越大。

The tolerance of seawater fish Japanese sea bass and black rockf ishto pH and alkalinity is studied through the experiment of acute toxicity. The median lethal concentration values are obtained by the method of probability unit. The safe concentrations of alkalinity, C032- and HC03- are obtained. The signification of pH and alkalinity is estimated with analysis of variance.

本文应用急性毒性试验方法研究了海水鱼类鲈鱼黑鲪对pH、碱度、二氧化碳体系各分量的耐受性，应用概率单位法求得半致死浓度，并得到了碱度、碳酸根、碳酸氢根等的安全浓度，应用方差分析评价了pH和碱度致毒作用的显著性，探讨了不同pH、碱度范围的主要致死因子。

This thesis has systematically studies the microstructure of the sinter bearing fluorine of different compositions and in different sintering condition.(1) The main units of the Low Fluorine Sinter are magnetite、hematite、 SFCA、larnite、glass and pore. The cuspidine doesn't form for the low content fluorine, and the fluorine is in glass; Sinter basicity dominates the forming of the larnite and SFCA, when basicity is between 1. 72 and 1. 96, there are more larnites in the binder phase, and when the basicity is biger than 1. 96, there are more SFCA in the binder phase; the hematite appears like magnetite and usually is around pore.

为此，本文对不同组成、不同烧结条件的烧结矿样品进行了系统的显微分析和研究，其主要内容包括：(1)构成低氟烧结矿的主要组元有磁铁矿、赤铁矿、铁酸钙、硅酸二钙、玻璃体和气孔，由于含氟量的降低，枪晶石等含氟矿物并未形成，氟分布在后期凝固的玻璃体中，其中硅酸二钙和铁酸钙受碱度影响较大，硅酸二钙在碱度为1.72～1.96范围内形成较多，铁酸钙在碱度大于1.96含量增多，赤铁矿呈磁铁矿假象，多分布在气孔周围，各组元的生成顺序为：磁铁矿—硅酸二钙—铁酸钙—玻璃体。

Mmol/L to juvenile Japanese sea bass, and 75.86, 63.46, 56.42 mmol/L to black rockfish. When pH is steady at 8.40 + 0.10, the 24-, 48-, 96-hour LC50 of Alk are 72. 79, 65. 28, 57. 92 mmol/L to Japanese sea bass, and 69. 47, 59. 37, 51. 96mmol/L to black rockfish. It is obvious that the toxicity of Alk to fish increases with the progressive increase of Alk or time when pH is at a constant level.3. According to analysis of variance of orthogonal test, pH and Alk have signification effects on the mortality rate of black rockfish.

pH在正常养殖范围时，通过碱度对海水鱼类鲈鱼、黑鲪的急性毒性试验，得到pH=8.10±0.10时，碱度对鲈鱼稚鱼(体长1.6～2.2cm)24、48、96h的半致死值为60.88、44.36、36.06mmol／L，安全浓度为7.07mmol／L；pH=8.05±0.10时，碱度对黑鲳幼鱼24、48、96h的半致死值为75.86、63.46、56.42mmol／L，安全浓度为13.32mmol／L.pH=8.40±0.10时，碱度对鲈鱼幼鱼24、48、96小时的半致死值为72.79、65.28、57.92mmol／L，安全浓度为15.76mmol／L；对黑鲪幼鱼24、48、96h的半致死值为69.47、59.37、51.96mmol／L，安全浓度13.01mmol／L。

In the negative and interrogative forms, of course, this is identical to the non-emphatic forms.

。但是，在否定句或疑问句里，这种带有"do"的方法表达的效果却没有什么强调的意思。

Go down on one's knees;kneel down

屈膝跪下。。。下跪祈祷