MFSK浅海远程通信多径抑制的频率分组编码方法

多频移键控调制技术（MFSK）对信道衰落有良好的适应性，是远程水声通信的重要技术。但是，用于浅海远程水声通信时，由于多径传播的影响，导致严重的码间干扰（ISI），使得远程微弱信号的频率估计产生较大偏差，误码率显著增加。本文针对远程水下信道和MFSK调制的特点，提出了一种新的频率分组编码（FGC）方法。该方法改变了传统MFSK的数据帧格式，相邻符号采用不同组的频率进行编码映射，有效抑制了多径干扰。在深入研究新方法统计特性的基础上进行了湖试验证，结果表明，采用FGC新方法的通信系统，多径抑制有效，性能稳健，更适合于80-100km水声远程通信。     

Synthesis, crystal structure and thermal stability of a novel 3D microporous coordination polymer: Na2[Co(1,4-napdc)2(DMF)2]

A new 3D inorganic–organic hybrid framework microporous material Na₂Co(1,4-napdc)₂(DMF)₂(1,4-napdc =  napthalene-1,4-dicarboxylate), which is constructed by coordination of cobalt ion and sodium ions with napthalene-1,4-dicarboxylate and DMF, is synthesized under solvothermal conditions. Two bidentate-bridging and two chelate-bridged carboxylate link a cobalt (II) and two sodiums (I) to the dimer structure. The square grids constructed with the caged-laddered-shaped secondary building units (SBUs) built by Co–O–Na–O and Co–O–C–O bond and 1,4-napdc links stack over each other to generate infinite 3D networks, which have a microporous channel (11.05 × 11.05 Å²) along the crystallographic c-axis. The thermal stability of the compound was investigated by differential scanning calorimetric and thermogravimetric analysis. The complexes could be anticipated as potential heat-resistant energetic material.     

丙酮+环己烷+甲醇组成的最低共沸混合物热力学性质的研究

Mesoporous molecular sieves Al-MSU-S has been prepared from the precursor of zeolite Y using ionic liquids 1-hexadecane-3-methylimidazolium bromide （CMIMB） as a template in basic medium, which exhibited larger pore diameter, pore volume and surface area than that synthesized using cetyl trimethyl ammonium bromide （CTAB） template.     

Integration Technique of Multi-source Information Dominated by Aerial Radiometric Measure-ment and Its Application

This paper aims at exploring a digital image integration technique for multi-geoscience in formation dominated by airborne gamma-ray data, especially deeply discussing the method to secondly develop those aerial data by combining digital image processing system with the colored mapping system. Utilizing this technique , we have analyzed the geologic environment of uranium mineralization of Lianshanguan area > Liaoning Province, provided some important background information for further seeking of minerals. Meanwhile , experimental studies have been made to predict uranium mineralization , and evident results aquired. Practise shows that this new technique offers prospecting significance for mineral seeking and great practical value in survey of uranium resources.     

Approximately analytical solutions of nonlinear te-mode surface waves on a metallic substrate

Using the Rayleigh-Schrödinger Technique (RST) the approximately analytical solutions of weaky nonlinear TE surface waves are presented. The results show that the velocity cut-off requencies and the dispersion relations of the waves have to do with the magnitude of waves.     

Properties of high-Tc superconducting circular waveguides with Meissner boundary

The propagation properties of the TE-modes in a high-temperature superconducting circular waveguide using the Mei\ner boundary conditions on the wall are presented for the first time. The results show that now the normalized cutoff parameterk _c R, (whereR is the radius of the superconducting circular waveguide andk _c the cutoff wavenumber,) is dependent on the radius unlike conventional metallic circular waveguide whose normalized cutoff parameterk _c R is a constant for a given mode and the filled dielectrics. Instead of TE₁₁-mode now TE₀₁ mode becomes the dominant mode and the normal component of magnetic field for the dominant mode is not equal to zero on the wall. Other unique results of high-T _c superconducting circular waveguides are illustrated, too.supported by Deutscher Akademischer Austauschdienst (DAAD)     

The co-transfection of p16(INK4a) and p14(ARF) genes into human lung cancer cell line A549 and the effects on cell growth and chemosensitivity

Two functionally and structurally different proteins, p16(INK4a) and p14(ARF), encoded by the gene INK4a/ARF located at 9p21 are cyclin-dependent kinase (cdk) inhibitors and important cell cycle regulators. More and more evidences have been accumulated to show that the exogenous p16(INK4a) or p14(ARF) can inhibit the cell growth and/or induce the apoptosis. But it is still unclear if they can play positive role when combine with the conventional chemotherapy in cancer treatment. Here we show that cationic liposome-mediated gene transfection of INK4a/ARF into lung cancer cell line A549, in which the INK4a/ARF locus was lost, suppressed the growth and induced apoptosis. When treated with five different chemotherapy drugs with different mechanism after the transfection, A549 got an increased chemosensitivity for adriamycin and cisplatin and an unchanged result for topotecan, taxol or vinorelbine. The results indicated that cell cycle redistribution and increased apoptosis index after transfection might be the main explanation for the enhanced chemosensitivity. The combination of gene therapy with conventional chemotherapy is not always better than single chemotherapy. This trial will be of benefit to the treatment of lung cancer when combine the conventional chemotherapy and gene therapy in the future.     

0.14THz高功率太赫兹脉冲的频率测量

提出了采用截止波导法与谐波混频法相结合的方式,进行0.14THz高功率短脉冲的频率测量.首先将两个截止频率分别为0.125和0.15THz的非标准矩形波导作为接收端,通过截止波导滤波法获得了太赫兹辐射源的频率范围.然后根据已知的频率范围,将本振频率选择为15—20GHz,则谐波混频的谐波次数确定为8.随后的Ka波段的脉冲测试和0.14THz连续波测试表明,该8次谐波混频器可用于0.14THz脉冲的混频测量.最后,0.14THz脉冲频率测量实验给出了太赫兹辐射源的准确频率为0.1465THz.该方法大大降低了对本振信号的频率要求,且结果准确可信,为长波段太赫兹脉冲的频率测量提供了一种新的思路.     

基于消息传递接口的空中爆炸问题的并行计算

研究了用于处理三维多物质欧拉网格的模糊界面技术以及算法存在的数据相关性问题,提出了解决数据相关性的方法。采用基于消息传递接口(MPI)模式,设计出了相应的MMIC-3D并行程序,得到了无限空气介质中爆炸的三维数值模拟结果,计算结果与实际的实验现象及规律基本吻合。在共享存储的全对称多处理机(SMP)上进行了测试,得到了理想的加速比。     

航天器内部充电效应及典型事例分析

航天器内部充电效应是由空间高能电子诱发的,通常发生在航天器内部以及表面绝缘材料深层,所产生的放电击穿及静电放电脉冲干扰较表面充电更为严重. 对内部充放电的一般规律进行了总结,并就一次典型的航天器异常事件,从异常的时空表现特征及其与高能电子环境扰动的相关性角度进行了深入分析和定量计算,得出了高能电子产生的内部充电引起的卫星异常的结论,为卫星异常诊断提供了范例.