Quantum-electrodynamic modification of atomic dipole matrix element in a strong converging laser field

In this paper we report at the first time a quantum-electrodynamic modificationresult to the dipole transition matrix elements related to the bound levels of an atom in a strongconverging laser field.When the laser intensity increases,the dipole matrix elements increaseat first.However,further intensity increase will bring about the matrix elements decrease.That means the dipole transition probability is suppressed.     

The chaotic behavior analysis near the points B_3～B_5 of a nonlinear Fabry-Perot cavity

In this paper a further proof is given to the instability of 2~n bifurcation near the point B_3. The chaos in B_3 seems to arrive via the route of intermittent and tangential bifurcation. It is also shown that a metastability chaos occurs in the transition from B_4 to B_5.     

HMO model of scalar field in medium and self-focusing

In this paper, the HMO model of scalar field in medium is presented using the general covariant classical theory of scalar field in medium, which is regarded as a curved space-time represented by optical metric model (OMM) and the case of self-focusing is discussed.     

Population Transfer of U Vapor Effected by the Population of a Trapped State

ＰｏｐｕｌａｔｉｏｎＴｒａｎｓｆｅｒｏｆＵＶａｐｏｒＥｆｆｅｃｔｅｄｂｙｔｈｅＰｏｐｕｌａｔｉｏｎｏｆａＴｒａｐｐｅｄＳｔａｔｅ￥ＮＩＮＧＸｉｊｉｎｇ；ＪＩＮＧＣｈｕｎｙａｎｇ；ＬＩＮＦｕｃｈｅｎｇ（ＳｈａｎｇｈａｉＩｎｓｔｉｔｕｔｅｏｆＯｐｔｉｃｓ...     

用还原型电化学检测器的高效液相色谱法分析柴油机排出物中的1-硝基芘

 ]本文采用带有还原型电化学检测器的高效液相色谱来分析柴油机排出颗粒物中的1-硝基芘。含有柴油机排出颗帕粒物的滤纸经二氯甲烷萃取后，过滤，浓缩，在硅胶层析柱上预分离。分别用正己烷，二氯甲烷和甲醇三种淋洗液淋洗，其中二氯甲烷级分在ODS柱的高效液相色谱上分离，其流动相为35％正丁醇-0，05M氯乙酸缓冲溶液（pH=3.8），玻璃碳为工作电极的电化学检测器，工作电压为-0.6V（参比电极是Ag／AgCl）。比较具有相同色谱保留时间的标准样品和实际样品色谱峰的动态伏安特性曲线确认了样品中存在有1-硝基芘。所分析的柴油机排出颗粒物萃取物中1-硝基芘含量范围为0.7到142ppm。为了改善高效液相色谱系统的分离能力，试验了微管柱，在所采用的电化学检测器流动池被改进后，总体系的理论塔板数达到26，000片，改善了分离能力。     

基于IMS的语音增值业务融合发展思路探讨

IMS网络的引入为电信运营商带来新机会,多媒体业务的丰富可为IMS用户带来新的业务体验,但是,在引入IMS网络后,业务网络将基于IMS核心网络进行融合,现有的固定网络和移动网络上的语音增值业务将大大丰富IMS用户和融合业务用户的业务体验,同时提升不同网络接入用户语音业务体验一致性。文中针对中国电信IMS网语音增值业务融合发展需求,结合广东电信典型业务创新性地提出IMS网络初期阶段语音增值业务融合发展思路,包括三种业务融合实现方式,分析其优缺点并提供应用建议,为建设初期基于IMS的业务融合提供参考。     

大气中硫酸生成反应势能面的量子化学研究

A new potential energy surface (PES) for the atmospheric formation of sulfuric acid from OH+SO₂ is investigated using density functional theory and high-level ab initio molecular orbital theory. A pathway focused on the new PES assumes the reaction to take place between the radical complex SO₃·HO₂ and H₂O. The unusual stability of SO₃·HO₂ is the principal basis of the new pathway, which has the same final outcome as the current reaction mechanism in the literature but it avoids the production and complete release of SO₃. The entire reaction pathway is composed of three consecutive elementary steps:(1) HOSO₂+O₂→SO₃·HO₂, (2) SO₃·HO₂+H₂O→SO₃·H₂O·HO₂, (3) SO₃·H₂O·HO₂→H₂SO₄+HO₂. All three steps have small energy barriers, under 10 kcal/mol, and are exothermic, and the new pathway is therefore favorable both kinetically and thermodynamically. As a key step of the reactions, step (3), HO₂ serves as a bridge molecule for low-barrier hydrogen transfer in the hydrolysis of SO₃. Two significant atmospheric implications are expected from the present study. First, SO₃ is not released from the oxidation of SO₂ by OH radical in the atmosphere. Second, the conversion of SO₂ into sulfuric acid is weakly dependent on the humidity of air.     

VISCOSITY BEHAVIOR OF PS/TOLUENE SOLUTION IN DILUTE AND EXTREMELY DILUTE CONCENTRATION REGION

1.INTRODUCTIONAsearlyas1950sitwasfoundthatsolutionviscosityofasinglepolymerinextremelydiluteconcentrationregionusuallyrevealssomeabnormalities,i.e.,thereducedviscosityconcentration(hsp/c~c)curvesdeviatefromlinearrelationshippredictedasHugginsequationandshoweitheranupwardoradownwardturnasconcentrationisverylow[1].Evenifforthe[()-0.2()]identicalPMMA/toluenesolution,therearetwocontraryresults:onereportedthecurvebendsupward[2],whiletheotherfounditdownward[3].Inordertointerpretthisabnormalphe…     

2015年度《理化检验-化学分册》杂志征订启事

<正>《理化检验-化学分册》杂志创刊于1963年,系由上海材料研究所与机械工程学会理化检验分会联合主办的技术类刊物。主要报道材料的化学分析与仪器分析专业领域中的新方法、新技术、新设备以及国内外的研究方向。"面向生产、注重实用、反映动向、兼顾普及"是刊物的编辑方针,旨在最大幅度地满足不同层次