三比二

The results showed that the yield of the esterification stage was 95.0% and the yield of the addition stage was 90.0% when the mole ratio of trimethylolalkane,triethyl phosphate and dimeth...

结果表明：亚磷酸三乙酯：三羟甲基丙烷：甲基磷酸二甲酯的摩尔比为1.05：1：1.2，自制复合有机酸为酯交换反应催化剂，质量分数为0.1%，反应温度85℃，反应时间3 h，自制复合有机碱为加成反应的催化剂，质量分数为1.0%，反应温度200℃，反应时间8 h，酯交换反应收率95.0%，加成反应收率90.0%。

Their half lives were 27.29 and 69.16 days respectively. Monocrotophos degraded into both methanol extractable and unextractable residues in the submerged soil.The analysis of 14C-methanol extractable. residue by TLC and ARG indicated that degraded products of monocrotophos were triether phosphate,;N-de-methyl Azodrin, O, O-dimethyl-vinyl-phosphatc,O-demethyl Azodrin,and O, C-demethyl Azodrin.The principal degraded extratable product of monocrotophos was triether phosphate, which incresed from 5% of the parent solution of monocrotophos to a range of 28-83%, furthermore and its degradation process was much faster in the unterilized soil than in the sterilized soil.

久效磷在淹水土壤中降解为甲醇可抽提态和不可抽提态残留物，对甲醇可抽提态残留物经TLC和红外光谱分析表明，其降解物为磷酸三酯、N-去甲基久效磷、O，O-二甲基乙烯基磷酸酯，0-去甲基久效磷，以及O，C-去甲基久效磷，但主要为磷酸三酯，其含量由母液中的5％增加到28—83％，这种降解过程，在未灭菌土壤中比在灭菌土壤中快。

According to the Box-Benhnken design principle,the method of response surface method with 3 factors and 3 levels was used. The factors influencing the technological parameters were determined by means of regression analysis. Response surfaces were finally graphed with the yield as the response value. The synthesis conditions were optimized as follows:reaction reagent was NBS,stoichiometric proportion between NBS and anhydrovinblastine was 1.07; the dosage of TFA was 22 mL/L; reaction temperature was －68 ℃ and duration was 90 min.

在单因素实验基础上，根据Box-Benhnken实验设计原理，采用三因素三水平的响应面分析法，研究了各个因素及其交互作用后，得到了合成7′-Br-脱水长春碱的最佳工艺条件：以二氯甲烷为溶剂，采用NBS为溴代剂，其用量与底物的物质的量比为1.07∶1，TFA的加入量22 mL/L，在－68 ℃下反应90 min，终止反应后，得到卤代产物。

For the problem of the ratio of inner to outer diameter of long tube, according to the "residual core" in the target plays an important role in DOP of long tube penetrator, the analytical model of long tube pentration in semi-infinite homogeneous steel target is established and calculated to devide three kinds of different scopes, the rule of varied by the ratio of inner to outer diameter is analyzed. The patterns of penetration of the yawed tubular against a normal homogeneous semi-infinite target is established, the size and direction of "residual core" is analyzed, under the different impact yawed, the regularity of variations in the yawed of the tube and depth of the penetrateion is described during the penetrateion against the plate.

二是对于长管体的不同内外径比，依据长管体时形成的中间&靶芯&是其侵彻机理不同于长杆体的重要因素，分三种情况建立了长管体对半无限均质靶板的简化理论模型，并进行了分析，得出了穿深随内外径比变化的规律；描述了带攻角长管体垂直侵彻半无限厚靶的物理图像，分析了&靶芯&力的大小和方向，建立了侵彻简化模型，给出了在不同的初始攻角条件下，管体在侵彻过程中攻角和穿深的变化规律。

basing on optics orthogonal codes,this paper proposes a new design scheme of three-dimension optics orthogonal codes.in this scheme,the optics orthogonal codes can be coded not only in space-domain,in time-domain,but also in frequency-domain.it has good auto-cross relativity properties.the simulation figures show that can enlarge the coeds capacity and improve the optics optical communications system performance.so it will be of interesting in coming high dense communication system.

摘 要：基于光正交码编码技术，提出了一种新型空/时/频三维ooc的设计方案，对光信号在时、频和空域进行编码，该码具有理想的自/互相关特性。通过仿真比较，在容量和系统的误码率等性能方面比一、二维ooc都有较大的提高，因而能很好地适应未来高密集光纤通信。关键词：三维光正交码；光码分多址；误码率；高密集光纤通信

Department of Chemical Pharmacology, Capital University of Medical Science, Beijing 100054, ChinaAbstract: A reversedphase high performance liquid chromatographic method was developed for the simultaneous quantitative determination of caffeine, dapsone and chlorzoxazone. The operation was carried out on a C18 column (250 mmX4.6 mm i.d., 5.0 μm) with the mobile phase of acetonitrilephosphate buffer including 0.02 mol/L KH2PO4 and 0.02 mol/L (C2H53N, pH 6.5(25:75 in volume ratio).

用反相高效液相色谱同时测定血清中咖啡因、氨苯砜、氯唑沙宗探针药物的质量浓度，以乙腈磷酸盐缓冲体系(含 0.02 mol/L的磷酸二氢钾和0.02 mol/L的三乙胺，pH 6.5)(体积比为25：75)为流动相，以安替比林为内标，经C18柱(250 mmX4.6 mm i.d。， 5.0 μm)分离，紫外检测器检测，使3种探针药物得到较好的分离，并且在有效血药浓度范围内线性良好。

Low-boiling phenols in low-temperature coal tar are important chemical raw materials. For the identification and determination of the individual phenol boiling below 210℃ in the low temperature coal tar, the methods of gas chromatography, liquid-liquid chromatography followed by ultra-violet analysis and fractional distillation followed by infrared analysis were evaluated and compared.

随着煤炼油工业的发展，煤焦油中的酚类，特别是低級酚，作为化工原料的利用很重要，我們应用(1)气液色譜法，(2)液液色譜与紫外光譜法結合及(3)精餾与紅外光譜法結合三种不同方法对210°以前的低級酚进行了各种异构体的成分分析，比較分析結果：三种方法对同一样品进行分析时，最大絕对誤差在2％以内，其中以气液色譜法最为快速，液液色譜法次之，精餾-紅外光譜法費时間較多；但后二种方法所得数据較完全。

On the contrary, sulfonated poly(arylene thioether phosphine oxide)s, with a IEC of 1.60 meq/g, even denote a swelling of 70.1% at 80oC and thus lose most of the mechanical strength.

而前述IEC为1.60 meq/g的磺化聚芳硫醚三苯基氧膦在80oC下的溶胀率为70.1%，已经出现溶胀突变，显著丧失力学强度，其耐溶胀性能比磺化聚二氮杂萘酮醚三苯基氧膦差得多。

Respectively proceeding with bromine complexing agent of anode, modified membrane and electrolytic additive of cathode, mainly referring to specific power of battery, ratio of self-discharge and zinc dendrite, this paper has studied the influences of different anode additive and modified membrane on specific energy of battery by means of charge and discharge curves, and the influences of electrolytic additive(NH4+, OP-10, TX-10 and dodecyl trimethyl ammonium bromide) on zinc dendrite by means of current-time curve and microscopic morphology observation.

本文分别从正极溴络合剂、隔膜改性和负极的电解液添加剂入手，以电池的比能量、自放电率以及锌枝晶生长情况为主要的性能指标，用电池充放电曲线等方法研究不同正极添加剂和隔膜改性对电池比能量的影响；用电流-时间曲线以及微观形貌观察等方法研究电解液添加剂(NH_4~+、OP-10、TX-10以及十二烷基三甲基溴化铵)对锌枝晶生长的影响。

He wasted little time reacquainting himself with that goal-scoring feeling, notching the opener in his first full outing our first win against Boro in the Carling Cup late in September.

在9月底对阵米德尔斯堡的比赛中，他首开记录帮助球队取得赛季首胜。在对阵胡尔城、西汉姆和斯托克城的比赛中，他三次梅开二度。

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。