激光辐照下双层钢板接触界面对传热的影响

 首次提出激光辐照下双层金属板界面会由于变形而产生脱离，从而对双层板之间的传热有明显的影响，通过实验和数值模拟验证这一提法。该工作丰富了接触热阻概念，有助于进一步加深对强激光破坏机理的研究，同时提供了一条有效的抗强激光加固的途径。     

干玫瑰花挥发性成分的提取及GC-MS分析

用水蒸气蒸馏法提取干玫瑰花的挥发性物质,测得玫瑰花挥发性物质的含量为8．60％（w／w）。利用GC—MS法分离鉴定出28种化学成分。用峰面积归一化法通过化学工作站数据处理系统得出各化学成分在挥发性成分中的相对含量,约占总成分的82％以上。     

ZnS:Cu,Er,Cl薄膜直流电致发光效率与电场分布关系的研究

利用Er3+离子的特征辐射,探测出ZnS:Cu,Er,C1薄膜直流电致发光器件中沿膜厚度方向场强分布是不均匀的:有三个高场区两个低场区.并测最了这五个区域里的发光效率,得出高场区的发光效率高,低场区的发光效率低.文中对高场区的形成原因及发光效率与场强的关系进行了讨论.     

江西捕食螨名录

<正> 近来我们调查了南昌、高安、丰城、清江、瑞金、赣州、南丰等十余县市,并将所收集的标本作了初步整理,已鉴定出栖息于农、林、果、蔬等植物上的捕食螨共31种(其中新种5种待发表),它们分别隶属于植绥螨科和蠊螨科的5个属。现将其种名、分布地区及栖息植物列出,供参考。     

金属柱壳膨胀断裂的实验与数值模拟

基于一端起爆的柱壳外爆加载装置,采用多普勒速度测量仪(DPS)及高速分幅相机联合诊断柱壳的膨胀断裂过程。实验获得了壳体表面的速度历史和膨胀变形、裂纹萌生扩展到爆轰产物泄露的动态图像。利用光滑粒子流体动力学方法(SPH)开展了对应的数值模拟,计算结果与实验结果吻合较好。实验与数值模拟结果系统地给出了冲击波入射柱壳角、爆轰波稀疏角、内壁速度压力历史及壳体变形应变、壳体断裂等物理信息。

     

聚三聚氰胺-石墨烯复合膜修饰电极对多巴胺与尿酸的同时测定

采用循环伏安法制备了聚三聚氰胺-石墨烯复合膜修饰电极(poly-(MA)-ERGO/GCE)。研究了抗坏血酸(AA)、尿酸(UA)和多巴胺(DA)在该修饰电极上的电化学行为。结果表明,该修饰电极对AA、UA和DA均有良好的电化学响应,且三者的氧化峰在该修饰电极上可完全分离。据此建立了在大量AA存在下同时测定UA和DA的新方法。在优化条件下,微分脉冲伏安法(DPV)测定UA和DA的线性范围均为1.0×10~(-8)~5.0×10-6mol·L~(-1),检出限(3sb)均为5.0×10~(-9)mol·L~(-1)。     

Ionization Suppression of Heteronuclear Diatomic and Triatomic Molecules in Strong Infrared Laser Fields

Ionization is the fundamental process in interaction of atoms/molecules with femtosecond strong laser fields. Comparing to atoms, molecules exhibit peculiar behaviors in strong-field ionization because of their diverse geometric structures, molecular electronic orbitals as well as extra nuclear degrees of freedom. In this study, we investigate strong field single and double ionization of carbon monoxide (CO) and carbon dioxide (CO₂) in linearly polarized 50-fs, 800-nm laser fields with peak intensity in the range of 2×10¹³ W/cm² to 2×10¹⁴ W/cm² using time-of-flight mass spectrometer. By comparing the ionization yields with that of the companion atom krypton (Kr), which has similar ionization potential to the molecules, we investigate the effect of molecular electronic orbitals on the strong-field ionization. The results show that comparing to Kr, no significant suppression is observed in single ionization of both molecules and in non-sequential double ionization (NSDI) of CO, while the NSDI probability of CO₂ is strongly suppressed. Based on our results and previous studies on homonuclear diatomic molecules (N₂ and O₂), the mechanism of different suppression effect is discussed. It is indicated that the different structure of the highest occupied molecular orbitals of CO and CO₂ leads to distinct behaviors in two-center interference by the electronic wave-packet and angular distributions of the ionized electrons, resulting in different suppression effect in strong-field ionization.     

A study of acoustical activity of BiP12GeO20

Acoustical activity of Bi₁₂GeO₂₀ has been studied by measuring the splitting of the degeneracy of transverse acoustical waves propagating along the directions corresponding to acoustical axes, [100] and [111] with neutron inelastic scattering. A comparison with the experimental results of α-SiO₂ and NaClO₃ has been done. Three striking features of acoustical activity can be obtained from the present study. One of them is that the attenuation is different for right circularly polarized mode of acoustical phonon propagating along acoustical axes from left one. This effect might have applications in the future.     

低温固态反应制备纳米Ba1-ySryTi1-xZrxO3介电材料及性能研究

将TiCl4的水解产物与固体Ba(OH)2按摩尔比1∶1混合,混合物经室温研磨、100℃烘干,得到钛酸钡纳米晶;按相同工艺掺杂,合成了一系列Ba1-ySryTi1-xZrxO3(0x≤0.3,0y≤0.4)固溶体;采用X射线衍射分析了产物的晶体结构,采用透射电镜观察了其形貌;并测定了系列固溶体的室温介电常数、介电损失.结果表明,所制备的Ba1-ySryTi1-xZrxO3为完全互溶取代固溶体,由平均粒径70 nm的球形微粒组成.经低温固态反应掺入适量锆、锶后,BaTi O3的室温介电常数由3 000提高到20 000左右.     

Cr2O3-Al2O3催化剂半导性对催化性能的影响

在剖析Cr_2O_3-Al_2O_3系催化剂微观结构的基础上,通过对Cr_2O_3 Al_2O_3的电导测定、热磁分析研究了Cr_20_3-Al_2O_3催化剂的半导性及它对临氢脱烷基催化过程的影响。实验结果表明,氧化态Cr_2O_3为p型半导体,在还原气氛中,将转化为n型。其转变温度随Cr_2O_3含量的增加而提高。催化甲苯临氢脱烷基的活性中心为Cr(Ⅱ)。具有尖晶石结构的γ-Cr_2O_3比α-Cr_2O_3的活性更好。在甲苯气氛中,载流子Cr(Ⅱ)越多,活性越高;在苯气氛中,载流子Cr(Ⅱ)相对越少,其对苯的选择性越好。