Influence of dopant concentration on electrical quantum transport behaviors in junctionless nanowire transistors

We discuss the random dopant effects in long channel junctionless transistor associated with quantum confinement effects. The electrical measurement reveals the threshold voltage variability induced by the random dopant fluctuation.Quantum transport features in Hubbard systems are observed in heavily phosphorus-doped channel. We investigate the single electron transfer via donor-induced quantum dots in junctionless nanowire transistors with heavily phosphorusdoped channel, due to the formation of impurity Hubbard bands. While in the lightly doped devices, one-dimensional quantum transport is only observed at low temperature. In this sense, phonon-assisted resonant-tunneling is suppressed due to misaligned levels formed in a few isolated quantum dots at cryogenic temperature. We observe the Anderson-Mott transition from isolate electron state to impurity bands as the doping concentration is increased.     

荧光光度法测定水体中痕量邻苯二酚

在pH 3.2的酸性介质中,邻苯二酚与染料天青Ⅰ相互作用导致荧光强度明显增强,以发射波长343.0nm测定时,邻苯二酚的浓度在0.075～30μmol.L-1范围内与其荧光的增强程度呈线性关系,方法的检出限(3s/k)为7.51nmol.L-1。方法用于实际水样分析,加标回收率在97.0%～104%之间,测定值的相对标准偏差(n=5)在2.8%～3.9%之间。     

化学学科“知识”、“思想”和“方法”三线合一的教学设计

化学学科教学的深层价值在于引领学生形成从化学的视角去认识物质世界和解决问题的思想方法.知识、思想和方法“三线合一”的教学设计,基于课程标准、教材及学生基础的分析,将知识的逻辑顺序和学科思想发展线索以及方法线索有机融合在一起,通过创设情境素材,设计驱动性问题,促进学生在积极的思维活动和认知参与中主动构建知识、形成学科思想和方法.     

(2+1)维sine-Gordon方程的孤子解（英文）

应用exp-函数法求得(2+1)维sine-Gordon方程的单孤子解、双孤子解、三孤子解,通过选取适当的参数,分别做出了单孤子解、双孤子解、三孤子解的函数图像,刻画了解的结构和性质.实践证明,应用exp-函数法研究非线性偏微分方程具有十分重要的作用和意义.     

尝试一题多解 锤炼解题能力

对于做题目,我们不要仅仅局限于会做,关键是要从做题目的过程中,掌握方法、深化知识.例1已知x满足x2-3x+1=0,求x+1x的值.方法1直接从已知条件入手,用求根公式求出x的值,再代入求值即可.     

解题基本要领例谈

解题训练具有巩固基础、强化技能、提高能力、开阔思路、发展思维等功效.如何做到科学高效的学习数学,下面我们结合几例谈谈一些解题基本要领:1.慎密思考数学是一门严谨的科学,解题要谨慎、细致、全面,思考要周密,要讲求依据,切忌想当然.     

基于光纤氧气传感器的细胞培养氧分压测试实验

基于荧光淬灭原理,利用光纤氧气传感器检测PK-15细胞培养过程中的氧分压.实验结果表明:随着细胞密度的增高,测得的氧分压减小,说明细胞在代谢过程中,耗氧量要大于氧气的扩散溶解量.细胞培养过程中液相中的氧分压水平不仅依赖于细胞培养环境气相中的氧分压,而且也依赖于细胞的密度和细胞代谢.     

Microwave Assistant Synthesis and Dimeric Crystal Structure of 2-(((6-Chloropyridin-3-yl)-methyl)thio)-5-(pyridin-4-yl)-1,3,4-thiadiazole

The title compound 2-(((6-chloropyridin-3-yl)methyl)thio)-5-(pyridin-4-yl)-1,3,4-thiadiazole 5(C26H18Cl2N8S4) was synthesized, and its structure was confirmed by 1H NMR, MS and elemental analyses and X-ray diffraction. It crystallizes in the triclinic system, space group P1 with a = 9.452(4), b = 12.335(4), c = 13.017(5) A, α = 90.624(5), β = 110.541(5), γ =104.879(4)°, Dc = 1.561 g/cm3, Z = 2, V = 1364.9(9) A3, F(000) = 656, the final R = 0.0300 and w R = 0.0635 for 4206 observed reflections with I 2σ(I). The preliminary biological test showed that the title compound has activities against Stemphylium lycopersici(Enjoji) Yamamoto, Fusarium oxysporum. sp. cucumebrium, and Botrytis cinerea with inhibitory activities to be 9.82%, 44.44% and 20.00%, respectively.     

提拉法生长直径10英寸优质Yb∶YAG激光晶体

设计制作了直径10英寸Yb∶YAG激光晶体生长热场，改进了单晶炉称重与旋转系统结构，采用感应加热熔体提拉法结合上称重自动控径技术，成功生长出了直径252 mm、等径长近260 mm的完整Yb∶YAG晶体，晶坯外观完整，无开裂。在5 mW绿光激光和20 mW He-Ne激光照射下检测，晶坯整体无散射。经检测性抛光后，晶坯选材扇区内光学均匀性较好，应力分布均匀。选择口径为152 mm×11.5 mm、长为260 mm的板条区域进行测试，透过波前畸变为0.29λ/inch@633 nm,表明晶坯具有良好的光学质量，可以选切加工宽度达到150 mm的大尺寸晶体板条元件。