Study on the Crystallization Mechanism of Spectinomycin Dihydrochloride

Dilutionisonekindofcrystallizationsthatiswidelyusedintheproductionofpharmaceuticals ,especiallyantibi otics.Dilutionhasmanyadvantagessuchashigherthrough putsbypreparingveryconcentratedinitialsolutions,loweroperatingtemperatureforheat labilesubstancesandbetterpu rificationasthemotherliquorretainsundesiredimpurities[1] .Oneofthecharacteristicsofdilutionisthatthesolventcom positionvarysastheprocessproceeds.Thesolventcomposi tionhasinfluenceonnotonlythenucleationratebutalsotherelativegrowthrateofe…     

有机静电感应三级管动作特性的实验分析

1 Introduction Organic semiconductors are receiving considerableattention due to their remarkable advantages especiallyvarious manufacturing methods ,lowcost and plentifulmaterials .Ebisawa ,et al.[1]fabricated the first poly-mer-based transistor in 1983 . Since then,lots of re-search works have been done in the filed of organicmaterial-based transistors .It was reported that organicthin-fil m transistor ( OTFT) fabricated by usingorganic semiconductor material copper-phthalocyanine(CuPc)[2…     

试论艺术设计学科的设计素描

从设计素描的概念分析出发,通过对绘画素描和设计素描的比较,阐述了结构素描和装饰意味素描的造型规律及所具有的理性化和应用性的特征。     

Longitudinal effects of induction on teaching skills and attrition rates of beginning teachers

The teaching profession faces a shortage as well as a decline of teaching skills. A possible way to mitigate this is to implement evidence-based induction arrangements. Seventy-one schools with 338 beginning secondary education teachers were randomly allocated to an experimental or a control group. The experimental schools used induction arrangements; the authors measured the effects of these arrangements by using repeated lesson observations and by comparing the rates at which beginners in the control and experimental groups left the teaching profession. Three years later, 14% of the control group and 12% of the experimental group had left. Leaving the profession could be explained by a lack of certification and low initial teaching skill levels. The experimental group exhibited greater improvement in teaching skills compared to the control group. Workload reduction influenced the skill level negatively, and coaching and observing had a strong positive influence on the skill level in Year 3.     

柯西不等式证法探讨

利用配方法、构造二次三项式、二元二次型的正定性、拉格朗日恒等式、行列式性质、数学归纳法以及算术平均-几何平均不等式等7种方法给出了柯西不等式的7种证法.     

一类递推关系的求解

递归关系在计算机科学，特别是在算法分析中有着广泛的应用，我们将讨论一个经典的递归关系的建立和解法．     

推理链：科学发现的逻辑新论

科学发现有没有逻辑的争论,由来已久.有人称其无,有人说其有,还有归纳派和演绎派的形同水火.究其实,争论是由逻辑观--传统形式逻辑和现代数理逻辑的不同引起的.其实,归纳派和演绎派各执一端,各有长短,彼此是相通的,类比、归纳和演绎整合的推理链,才是科学发现的逻辑.     

莘数理论(V)

首先给出了函数的本式值和标式值的概念 .在限制使用极限的前提下 ,独立地推出了微积分理论 .并给出了在相对论方面的简单应用 ,求出了光子的静止质量 .     

一段圆弧电流轴线上磁场的解法

直接从载流直导线的磁感应强度公式出发,利用极限的思维方法,分析出任一段载流圆弧导线在轴线上一点产生的磁感应强度表达式,并得出圆电流轴线上的磁感应强度.     

连续归纳法在微分学中的应用

叙述了连续归纳法 ,并用它证明了微分学中的若干命题