说明:双击或选中下面任意单词,将显示该词的音标、读音、翻译等;选中中文或多个词,将显示翻译。
您的位置:首页 -> 词典 -> 取代值; 取代度
1)  substitution value
取代值; 取代度
2)  substitution value
取代值
3)  DS
取代度
1.
Native starch was modified by etherification with acrylonitrile,and films were prepared from blends of polyvinyl alcohol(PVA) with cyanoethyl starch(CES) with different degrees of substitution(DS) by solvent casting methods.
研究了原淀粉通过丙烯腈醚化改性,用不同取代度的氰乙基淀粉与聚乙烯醇(PVA)利用溶剂流延法共混制膜。
2.
The treatment effect of slightly polluted water with modified guar and the influence of such factor as reaction temperature,reaction time,consumption of chloroacetic acid,consumption of sodium hydroxide,ethanol dosage,and stirring time on the DS of carboxyl methyl guar were investigated,and the optimal reaction conditions for the preparation were also determined.
研究改性瓜尔胶处理微污染水的效果,以及反应温度、反应时间、氯乙酸用量、碱用量、酒精用量和搅拌时间等因素对羧甲基瓜尔胶取代度的影响,确定制备的最佳反应条件。
3.
The results showed that the water reducing ratio of sulfonated starch is increased with the degree of substitution(DS).
结果表明:磺化淀粉减水率随磺酸基取代度增加而增加,当其取代度达到0。
4)  degree of substitution
取代度
1.
Research on preparation of carboxymethyl starch with high degree of substitution;
高取代度羧甲基淀粉的制备研究
2.
Synthesis of konjac glucomannan ester of palmitic acid and determination of degree of substitution
棕榈酸葡甘聚糖酯的合成及取代度的测定
3.
Cellulose benzoate(CB),the degree of substitution(DS) of which was calculated from the content of C determined by element analysis,was prepared from microcrystalline celluloseand benzoyl chloride under heterogeneous condition and characterized by FT-IR and()~1H-NMR.
研究了微晶纤维素和苯甲酰氯在多相条件下合成制备纤维素苯甲酸酯(CB)的反应,通过元素分析所得碳的质量百分含量计算了产物的取代度(D S),并系统研究了吡啶与N,N-二甲基乙酰胺或与三乙胺混合反应溶剂、苯甲酰氯与纤维素羟基的摩尔比r、反应温度和反应时间对D S的影响,用FT-IR和1H-NM R对产物进行了表征。
5)  high degree of substitution
高取代度
1.
Synthesis and characterization of starch acetate of high degree of substitution;
高取代度淀粉醋酸酯的合成及表征
2.
Study on preparation of starch acetate with high degree of substitution by microwave with the high amylose
高直链淀粉微波制备高取代度醋酸酯淀粉的研究
3.
Acetylated starches with high degree of substitution were synthesized from cornstarch with acetic anhydride as esterifying agent and methanesulphonic acid as catalyst.
以玉米淀粉为原料,醋酸酐为酯化剂,甲烷磺酸为催化剂,制备高取代度淀粉醋酸酯。
6)  substitution degree
取代度
1.
Test of Influence of Substitution Degree on Cationic Starch Property;
取代度对阳离子淀粉性能的影响试验
2.
Determination of substitution degree of N-succinyl-chitosan by conductometric titration;
电导滴定法测定N-琥珀酰壳聚糖取代度
3.
Preparation of starch succinate with low substitution degree(DS) was studied by using corn starch as raw material,succinic anhydride as esterifying reagent,water as solvent and sodium hydroxide as catalyst.
以玉米淀粉为原料,丁二酸酐为酯化剂,以水为媒介,氢氧化钠为催化剂对低取代度淀粉丁二酸酯的制备工艺进行了研究。
补充资料:力学量的可能值和期待值
      在量子力学中,力学量F用作用于波函数上的算符弲表示。在数学上,对于一个算符,满足
  
  
  的函数 ui(r)称为弲的本征函数,式中Fi是与r无关的数,称为本征值。如果ui(r)描写微观粒子的状态,则它必须满足单值、连续和有限的标准条件。在这种限制之下,上式中的本征值可以取一系列分立值,或取一定范围内的连续数值。
  
  在测量力学量F时,观察到的只能是它的本征值。若一个力学量的本征值具有分立谱,我们说这个力学量是量子化的。
  
  量子力学中假定力学量的全部本征函数组成一个完全系;这意思是说:描写体系的任一状态的波函数ψ都可以用力学量的本征函数ui展开:
  
  
  在ψ和ui都是归一化的情况下,上式中的展开系数сi具有如下的物理意义:在ψ态中测量力学量时,得到结果为Fi的几率是|сi|2
  
  因此,若微观粒子的定态波函数是某力学量算符的本征函数ui(r),则在这一状态中,力学量F取确定值Fi
  
  在ψ态中对力学量进行多次测量,把所得结果加以平均,就得出力学量在ψ态中的期待值,以〈F〉表示:
  
  
  上式称为力学量的期待值公式。如果ψ不是归一化的,那么期待值公式应写为
  
  
  

说明:补充资料仅用于学习参考,请勿用于其它任何用途。
参考词条