基于内乘波概念的TBCC进气道过渡模态研究

TBCC(涡轮基组合循环)在过渡模态的工作,是这种新型高速动力系统的关键问题。本文针对基于内乘波概念的内并联式TBCC进气道进行了其过渡模态流场的研究。首先,应用本团队自主提出的内乘波式进气道设计概念,提出一种新型TBCC进气道设计方案。然后,验证了其在设计马赫数4.0下实现全流量捕获,在模态转换时,分流板的分流是有效的。针对其在过渡模态马赫数2.5的性能,通过基于数值模拟的设计参数分析,发现在内参考收缩比为3.11时进气道流通面积合适可实现自起动、且综合性能较优。研究还发现,分流板偏转角度范围越小,分流段流动越好、通流出口总压恢复系数也越高。     

装备现场级综合诊断系统设计

为了更好地应对基层保障人员在高技术武器装备现场保障过程中保障效能不足的问题,基于网络为中心的架构和标准化的信息描述,提出了一种装备现场级综合诊断系统的技术方案;利用便携式自动测试设备和远程技术支持系统集成各级保障机构的测试诊断资源和装备全寿命周期的保障信息资源,并通过网络将相关的诊断资源提供给现场的保障人员,为现场的装备故障诊断提供直接的、实时的、工程化的支持,能有效提高部队对复杂武器系统的现场抢修效能。     

风云三号C星全球导航卫星掩星探测仪首次实现北斗掩星探测

全球导航卫星掩星探测仪(GNOS)是国际首台北斗系统(BDS)和全球定位系统(GPS)双系统兼容掩星探测仪, 2013年9月23日随风云三号卫星C星(FY3 C)发射入轨, 目前已测得大量掩星数据. 介绍了FY3 C-GNOS的组成; 统计了2013年10月12日全天的FY3 C-GNOS掩星事件及其全球分布情况; 通过与GPS精密定轨结果进行对比分析, 测试了BDS在轨实时定位精度, 检验了BDS掩星产品的可靠性和一致性. 初步分析结果表明: 14颗BDS卫星在轨运营的条件下, BDS和GPS兼容掩星探测仪可将掩星事件数提高约33.3%; BDS实时定位平均偏差优于6 m, 标准偏差优于7 m; 5-25 km高度范围内, BDS与GPS内符合精度大气折射率优于2%, 温度优于2 K, 湿度优于1.5 g/kg, 压强优于2%, 电离层峰值密度优于15.6%. GNOS的在轨正常运行及BDS与GPS掩星定位精度及反演产品的一致性为北斗掩星探测的业务化运行奠定了基础.     

Xe54+离子与Xe原子碰撞过程中的辐射电子俘获及退激发辐射的理论研究

基于多组态Dirac-Fock理论方法和冲量近似, 对Xe⁵⁴⁺与Xe在197 MeV/u碰撞能量下, 炮弹离子的俘获及退激发过程进行了理论研究. 计算了炮弹离子从中性靶原子俘获一个电子到nl (n=1, 2, 3, 4, 5; l=s, p, d) 轨道上的辐射电子俘获截面和相应的辐射光子能量, 以及俘获末态退激发辐射跃迁的能量和概率. 结合这些计算结果, 进一步模拟了碰撞产生的炮弹离子的退激发X射线谱的结构, 并与兰州重离子加速器装置上的最新实验观测结果进行了比较, 符合得很好.     

基于ZigBee的煤矿井下预警防爆监测系统设计

针对矿山井下的特殊环境,提出了一种基于ZigBee技术的煤矿井下预警防爆监测系统,实现煤矿井下环境信息和人员位置的实时监测,以减少事故发生率;井下系统采用CC2530+CC2401芯片作为ZigBee节点的核心,井下主控制器通过CAN总线实现与井上上位机的通信;上位机使用Labview软件实现程序编程,实时显示煤矿井下采集到的CH₄、CO、O₂浓度、温湿度和人员坐标等参数并进行Web发布;该系统结合了基于模糊逻辑算法的预警技术、基于物理隔离的防爆技术,同时提出了一种融合LQI的RSSI加权质心算法;实验证明该系统运行稳定可靠,提高了人员定位的精度,具有良好的应用前景。     

Diterpenoids from Aerial Parts of Clerodendranthus spicatus and Their Cytotoxic Activity

A chemical investigation of AcOEt‐soluble portion of the 95% EtOH extract of the aerial parts of Clerodendranthus spicatus led to the isolation and characterization of a new diterpenoid, named clerospicasin J ( 1 ). Structure elucidation of 1 was achieved by spectroscopic analyses, including 2D‐NMR. The diterpenoid 1 exhibited significant inhibitory activity on the proliferation of the SKOV3 cell lines. Moreover, the cytotoxicity of 1 against SKOV3 cells was related to apoptotis as confirmed by DAPI (=2‐(4‐amidinophenyl)‐1H‐indole‐6‐carboxamidine) nuclear staining and flow cytometry.     

Solid‐Phase Organic Synthesis of 1,4‐N‐Vinyl‐ and 1,4‐N‐Allyl‐Triazoles with the Sulfonate Linker

Polymer‐supported 2‐azidoethyl sulfonate and 3‐azidopropyl sulfonate reagents have been developed and applied to the solid‐phase organic synthesis of 1‐vinyl‐ and 1‐allyl‐1,2,3‐triazoles, respectively, by CuI‐mediated azide‐alkyne cycloadditions and subsequent cleavage from the polymer support through elimination reaction promoted by DBU. The advantages of this new synthetic method include simple operation and high yield of the products, as well as good stability of the reagents.     

Synthesis of Ethyl Isoxazole‐3‐Carboxylates Using an Ionic Liquid as a Soluble Support

A regioselective 1,3‐dipolar cycloadditions of ionic liquid‐supported vinyl ethers, derived from ionic liquid‐supported α‐phenylselenomethyl ether, with ethyl cyanoformate N‐oxide gave supported isoxazoline derivatives, which were then cleaved from the ionic liquid support under mild acidic conditions to afford ethyl isoxazole‐3‐carboxylates. This new synthetic method is simple and efficient and the products are obtained in good yields.     

Synthesis of 2,5‐Diketopiperazine Derivatives Using 2‐Isocyanophenyl 4‐Methylbenzoate as a Fragrant Convertible Isocyanide

A new protocol in which 2‐isocyanophenyl 4‐methylbenzoate is used as a convertible isocyanide for Ugi/deprotection + activation/cyclization synthesis of 2,5‐diketopiperazine derivatives has been developed. This operational simple procedure displays good functional group tolerance and avoids treatment of typically known offensive isocyanides.