Graphene oxide for diode-pumped Tm:YLF passively Q-switched laser at 2 μm

A diode-pumped Tm:YLF passively Q-switched laser at 2 μm was first demonstrated by using graphene oxide(GO) as a saturable absorber(SA).In this letter,continuous-wave(CW) laser and pulse laser performances were studied meticulously and systematically.It reasonably showed the dependence of the pulse duration,pulse energy,and pulse repetition rate on the absorbed power.A maximum repetition rate of 38.33 kHz and a single pulse energy of 9.89 μJ were obtained.     

汽车检测领域数字化转型成熟度模型的构建研究

随着数字经济浪潮的推进,数字化转型已成为企业发展的共识性趋势,汽车行业作为支柱型产业正在积极探索数字化转型之路。但目前尚缺少标准化的评估模型和评价指标来衡量汽车企业的成熟度水平和能力阶段,该文通过对汽车行业重点企业进行调研与专家研讨,参考中信联《数字化转型-成熟度模型》等通用类成熟度评估模型,对汽车试验检测领域的数字化转型成熟度评估模型进行构建与研究,希望为相关行业/企业提供一定参考。     

New insights into the limit of the magnetic monopole flux and the heating source in white dwarfs

Based on the magnetic monopole(MM) catalytic nuclear decay(Rubakov-Callan(RC) effect),we propose five new models to discuss the limit of the MM flux and the heating energy resources of white dwarfs(WDs)based on observations of 13 red giant branch(RGB) stars.We find that the number of MMs captured can reach a maximum value of 9.1223 × 10²⁴ when m=1017 GeV,n_B=5.99×10³¹ cm^-3,φ=7.59×10^-26cm^-2s^-1sr^-1.The good agre...     

乙酰丙酮钌催化硝基苯氢转移氢化制苯胺

以自制的乙酰丙酮钌配合物（Ru(acac)3）为催化剂,甲酸钠为氢供体,十六烷基三甲基溴化铵为乳化剂,研究了水溶液中催化硝基苯氢转移氢化制苯胺的工艺。 确定了适宜反应条件为：甲酸钠和硝基苯摩尔比为2∶1,反应温度80 ℃,反应时间4.0 h,Ru(acac)3用量为硝基苯质量的4%。 硝基苯的转化率和苯胺产率分别为100%和96.65%,表明Ru(acac)3对硝基苯氢转移氢化制苯胺具有优异的催化作用。     

硬盘加密系统在信息安全中的应用

从硬盘加密系统研究的背景与国内外发展现状出发,分析了硬盘加密的原理,重点对基于驱动过滤层、DSP芯片、FPGA的3种硬盘加密体系结构进行了分析比较,并对其系统中密钥管理这一难点问题进行了探讨,提出了硬盘加密系统中的可行性方案并加以比较,最后结合目前发展的形式对下一步硬盘加密系统的发展趋势做了进一步的阐述。     

Resonance reaction rate of 21Na(p, γ)22Mg

By using the new Coulomb screening model and most recent experimental results, this paper calculates the resonance reaction rates of ^21Na（p,γ）^22Mg. The derived result shows that the effect of electron screening on resonant reaction is prominent in astrophysical interesting temperature range. In conjunction with the experimental results, the recommended rates of^21Na（p,γ）^22 Mg would increase at least 10%, which undoubtedly affect the nucleosynthesis of some heavier nuclei in a variety of astrophysical sites.[第一段]     

Bremsstrahlung neutrino energy loss for ^24Mg, ^28Si, ^32S, ^40Ca, ^56Fe in strong electron screening

Based on Weinberg-Salam theory the bremsstrahlung neutrino energy loss for nuclei ^24Mg, ^28Si,^32S, ^40Ca and ^56Fe are investigated in strong electron screening. Our results are compared with those of Dicus＇ and show that the latter are higher by 2 orders of magnitude in the density-temperature region of 10^8 g/cm^3 ≤p/μe ≤ 10^11 g/cm^3 and 2.5≤ T9≤ 4.5. On the other hand, the factor C shows that the maximum differences are 99.16%, 99.13%, 99.12%, 99.055%, 99.040% corresponding to the nuclei ^24Mg, ^28Si, ^32S, ^40Ca and ^56Fe.     

Neutrino energy loss by electron capture in magnetic field at the crusts of neutron stars

Based on the p-f shell model, the effect of strong magnetic field on neutrino energy loss rates by electron capture is investigated. The calculations show that the magnetic field has only a slight effect on the neutrino energy loss rates in the range of 10⁸—10¹³G on the surfaces of most neutron stars. But for some magnetars, the range of the magnetic field is 10¹³—10¹⁸G, and the neutrino energy loss rates are greatly reduced, even by more than four orders of magnitude due to the strong magnetic field.     

Strongly screening β~- decay antineutrino energy loss in presupernova

In this study, we investigate the ion-ball screening model(model(I)), focused on the screening electrostatic potential per electron under the Wigner-Seitz approximation and the Q-value correction. By considering the changes of the Coulomb free energy and the effects of strong electron screening(SES) on the Q-value and the Coulomb chemical potential, we discuss the linear-response screening model(model(Ⅱ)). We also analyze the influence of the SES on the β~- decay antineutrino energy loss rate by considering the corrections of the Q-value, the electron chemical potential, and electron energy, as well as the shell and pair effects. The antineutrino energy loss rate is found to increase by two orders of magnitude(e.g., the SES enhancement factor reaches 651.9 for model(Ⅱ)) due to the SES effect.     

紫外域多纵模高光谱分辨率激光雷达探测气溶胶的技术实现和系统仿真

多纵模高光谱分辨率激光雷达是一种新型的高光谱分辨率激光雷达.本文在研究典型高功率Nd:YAG脉冲激光器的多纵模模式及其在大气中传输的气溶胶米散射和瑞利散射光谱的基础上,设计紫外域多纵模高光谱分辨率激光雷达系统,采用窄带干涉滤光片滤除太阳背景光的影响,设计可调谐马赫-曾德尔干涉仪,分离提取多纵模激光回波中的气溶胶米散射和瑞利散射光谱,并利用马赫-曾德尔干涉仪双通道输出的互补性原理,精确反演气溶胶光学参量.系统仿真结果表明,所设计的紫外域多纵模高光谱分辨率激光雷达能够实现10 km高度内的气溶胶光学参量精细探测.