速度调制光谱技术特性的研究

利用N2^ A^2Ⅱu-X^2∑g^ (2-0)Meinel带系谱线研究了速度调制光谱技术的特性。从理论和实验上考察了速度调制谱信号强度与放电电流、放电气体的气压以及真空泵的泵速的关系。利用所获得的研究结果提高谱仪的灵敏度和分辨率达3倍以上,实验运行开支节省3／4左右。表明该实验研究具有重要的应用价值。     

CF X2Π（υ＝1）远红外及NO X2Π（υ＝1←0）中红外激光磁共振光谱的标识

根据塞曼效应理论和激光磁共振 (LMR)光谱原理 ,本文建立了一套用于标识激光磁共振光谱的模型方法 ,并成功地对CFX2 Π(υ =1)远红外及NOX2 Π(υ =1← 0 )中红外激光磁共振光谱进行了标识。为新自由基分子的激光磁共振光谱提供了快速而准确的标识方法     

THE MID-INFRARED FREQUENCY STANDARD USING 14NmO(m=16,17,18) SPECTRAL LINES

Based on the global analysis of all available and reliable data for isotopic species ¹⁴N^mO(m=16,17,18), the ¹⁴N¹⁶O rovibrational spectral lines are calculated with very high accuracy and completely agree with previous results. These lines with relative intensities can be achieved as an infrared frequency standard in the spectral range 1600-5600 cm^-1. The calculated rovibrational transitions of ¹⁴N^mO(m=17,18) have the same accuracy as that for ¹⁴N¹⁶O although their data are rare due to their small natural abundance.     

CO LMR spectrum of ~(14)N~(16)O and its analysis with spectra of ~(14)N~(17)O and ~(14)N~(18)O

LMR spectra for v=1←0 transitions of 14N16O in X2Π1/2,3/2 states were observed at 5.6 μm and 5.4 μm of CO laser. Introducing the advanced isotopic molecular constant scaling function to Hund's case (a) diatomic structure model, these spectra were analyzed and fitted together with all reliable previous spectral data of 14N16O as well as 14N17O and 14N18O. A full set of precise molecular parameters and their vibrational dependencies have been determined with much higher precision (1 -2 orders for most parameters). Many of them have been obtained for the first time. Using isotopic scaling function, the molecular constants of 14N17O and 14N18O were deduced.     

原子—场耦合系统中非局域性和纯度

本文讨论了光场初态和热库对原子——场耦合系统中量子非局域性和线性熵的影响。我们发现如果腔场无损耗且处于真空库，原子——场态会周期性的展现量子非局域性，原子和场的线性熵也会周期性地振荡，其周期和量子非局域性变化的周期相同。如果腔场损耗很弱而且热库的平均光子数很小，量子非局域性会消失，原子和场振荡的振幅逐渐减小。量子非局域性消失的速度取决于初始压缩相干态的幅度、腔的衰减系数和热库的平均光子数N。场越强、平均光子数和衰减系数越大，非局域性减弱的越快。     

新型可调远红外激光光谱仪及CHF3和SO2的纯转动光谱

文章报道与英国剑桥大学合作建立的新型可调远红外激光光谱仪的技术特点和工作原理。该光谱仪利用二极管的非线性特性 ,将CO2 激光泵浦产生的远红外激光与微波进行混频 ,得到边带远红外激光辐射 ,调节微波频率来实现边带远红外激光的扫描。利用该谱仪观测了CHF3 振动基态J =34～ 33,K =0 ～15和SO2 基态的 194,16～ 183 ,15,382 ,3 6～ 373 ,3 5纯转动光谱 ,并对它们进行了标识。     

碾压混凝土坝施工层面变形分析模型

针对碾压混凝土坝施工层面对大坝变形产生显著影响的问题,深入研究了施工层面的变化性质及规律,提出了层面不同阶段变形的模拟方法,建立了施工层面有厚度和无厚度分析模型,提出的模型能反映层面的弹性变形、衰减蠕变、不可逆变形以及加速蠕变等变形状态．实例分析表明:所提出的碾压混凝土坝施工层面有厚度和无厚度分析模型能较客观地模拟大坝的结构变化形态,尤其是施工层面有厚度分析模型较完整地模拟了层面的渐变规律,其计算结果与原位监测成果吻合较好．同时,提出的方法和建立的分析模型可推广应用于常规混凝土坝,特别是坝基内断层和夹层等变形规律的分析．     

ALICE实验内径迹系统探测器升级

大型重离子对撞实验(A Large heavy-Ion Collision Experiment，ALICE)按计划在大型强子对撞机(Large Hadron Collider，LHC)的第二次停机(2019—2021)期间进行探测器升级工作。为了对强相互作用物质——夸克胶子等离子体(Quark-Gluon Plasma，QGP)的性质进行更细致的研究，作为升级计划中重要的一个内容是把ALICE实验现有的内径迹系统探测器(Inner Tracking System，ITS)全面升级为基于单片有源像素传感器(Monolithic Active Pixel Sensor，MAPS)技术的硅像素探测器(习惯称之为ITS2)，并在Run 3和Run 4期间采集更多的铅核-铅核碰撞数据。新的ITS2共由7层(内3层，中间2层和外2层)探测桶面组成，共由24 000余片尺寸为3 cm × 1.5 cm的MAPS硅像素芯片(该芯片称之为ALPIDE)构成，有效探测面积达10 m2，共约120亿像素。ALPIDE芯片厚度为50 μm，单个像素的尺寸是27 μm × 29 μm，该芯片具有低功耗、高空间分辨率和高速读出等特点。ITS2将使ALICE探测器在测量极低横动量粒子时具备优异的探测效率和碰撞参数分辨率，同时也使ALICE探测器适应于LHC高束流亮度环境。目前ITS2的探测器模块量产和测试已于2019年完成，并在欧洲核子中心(CERN)洁净室完成了7层桶面的组装与安装，于2020年完成试运行测试。2021年1月启动ITS2在ALICE探测器中的安装与试运行工作，计划于2021年5月底完成ITS2的安装与测试。本工作将对ALICE/ITS2的探测器结构、ALPIDE芯片和升级进展等方面进行介绍。     

密闭消解ICP-AES测定钨矿石和钼矿石中的9种组分

采用密闭消解法分解试样,电感耦合等离子体-原子发射光谱法(ICP-AES)测定钨矿石和钼矿石中的主量和微量元素.试样经过氧化氢、氢氟酸、盐酸、硝酸、高氯酸密闭消解,王水和酒石酸提取后,用ICP-AES同时测定钨矿石和钼矿石中铍、铁、钾、镧、锰、钼、钠、钛、钨等9种元素,利用离峰背景校正法消除了背景干扰.方法的检出限在0.14-145μg/g之间,测定结果的相对标准偏差(RSD,n=12)均小于10％,加标回收率在90％-110％之间.经国家一级标准物质分析验证,分析结果与推荐值基本吻合.     

Analytic model of deformation of construction interfaces of rolled control concrete dam

The construction interfaces of RCCD have a distinct influence on the deformation of dams. The characters and rules on deformation of construction interfaces are studied. The methods simulating the deformation of the interfaces at different stages are proposed. A thickness analytic model and a no-thickness analytic model of construction interfaces are built. These models can reflect the elastic deformation, the attenuation creep deformation, the irreversible creep deformation and the accelerating creep defor- mation of interfaces. The example shows that these proposed models can simulate the deformation of the dam structure objectively. Especially, the results of the thickness analytic model which simulates the gradual changing regularities of interfaces can tally with those of monitoring in situ preferably. The methods proposed and the analytic models can be generalized and applied to general concrete dams, especially to the analysis on deformation rules of fault and interlayer in dam base.