适用于TEDS系统的AMC与HARQ结合算法

研究陆地集群无线电增强数据业务（TEDS）中的自适应调制编码（AMC）与HARQ结合算法. 该算法采用基于SNR的切换门限判别法进行调制编码方式的选择,采用大数逻辑译码算法进行重传数据帧的合并. 仿真结果验证了所提出的算法可有效地提高TEDS系统数据传输的可靠性,当最大重传次数为2时,所提出的算法能够使系统的误帧率由36.49%下降到6.93%.      

Dynamic analysis of DNA damage induced miRNAs in colon cancer cells

It is known that microRNAs （miRNAs） expression profile shows substantial changes in cells under DNA damage. Here, we did miRNA microarray and quantitative real-time PCR to comprehensively identify the differentially expressed miRNAs in colon cancer cell lines HCT116 p53＋/＋ and HCT116 p53-/-. Cluster analysis revealed a panel of differentially expressed miRNAs which are regulated by p53 and/or UV-C induced DNA damage. These altered miRNAs tend to be located in chromosomes 13, X and 17. Moreover, pathways enrichment analysis estimated that MAPK pathway, focal adheren pathway, p53 pathway and Wnt pathway were mediated by these miRNAs to exert their functions in DNA damage response. Additionally, we found that miR- 320a, one of the UV-C induced miRNAs, play a role in protecting cells from DNA damage. Taken together, our results show that miRNAs are dynamic regulated in p53- dependent or -independent manners in different cell contexts and different situations following DNA damage.     

基于LIF技术的煤矿水源识别系统应用

本文主要叙述LIF(激光诱导荧光光谱分析)技术的基本原理以及在水源识别中的应用,重点分析LIF技术的系统构成和主要模块的选择设计。通过该系统对某矿的送检水样和标准水样进行荧光实验,得到水样的荧光光谱图。传统的水源识别主要依据水中代表离子的离子浓度进行分析,但是从荧光光谱分析水中代表离子的离子浓度难度较大。本文提出一种较为简单且实用的方法由荧光光谱进行水源的精确识别,即使用相应分析软件分别测量未知水样与标准水样的欧氏距离,得出未知水样的精确分类。对未知水样的水源识别验证了该系统的可行性,解决了当前煤矿无法对突水情况进行实时在线监测的难题,对于煤矿的安全生产具有重要意义。     

Induction of human β-defensin-2 in airway epithelial cells by Streptococcus pneumoniae： involvement of IP3-dependent intracellular calcium release and NF-κB

Human β-definsin-2 （hBD-2） is mainly induced by bacterial factors and pro-inflammation mediators in epithelial cells. As the major cause of community-acquired pneumonia, whether Streptococcus pneumoniae （S. pneu-moniae） stimulation induces hBD-2 expression in airway epithelial cells is elusive. In this study, we found that S. pneumoniae stimulation induced hBD-2 expression in a time-and concentration-dependent manner in primary human airway epithelial cells. To further reveal the mechanism of S. pneumoniae inducing hBD-2, we found that S. pneumoniae stimulation activated NF-κB signaling pathway. Specific NF-κB inhibitor, PDTC, could reverse the induction of hBD-2 by S. pneumoniae. We also found that cellular inner Ca^2＋ signaling is involved in the S. pneumoniae-induced hBD-2. Taken together, our find-ings indicated that S. pneumoniae can stimulate the expression of hBD-2 in airway epithelial cells and NF-κB and inositol triphosphate-dependent intracellular calcium release is involved in this induction.     

Compression behavior of Sm）2Ti2O7-pyrochlore up to 50 GPa：single-crystal X-ray diffraction and density functional theory calculations

Single-crystal X-ray diffraction at pressures up to 50 GPa has been employed to study the compression behavior of Sm2Ti2O7-pyrochlore. In contrast to earlier reports, we observed no pressure-induced amorphization or pressure-induced anion disorder up to 50 GPa. The experimental study has been complemented by density functional theory-based calculations. A combination of the theoretical and experimental data yields a bulk modulus of 185 GPa, significantly higher than a value which had been reported earlier. In comparison to earlier work, the current study provides more reliable data due to the use of neon as a pressure medium, which provides a more hydrostatic pressure than the aluminum, which had been employed as a pressure medium in the earlier studies. An analysis of the compressibility of Al2B2O7 pyrochlores shows an approximately linear dependence of the bulk modulus on the unit cell volume.     

香烟燃烧过程中重金属含量及分布规律的研究

本实验采用火焰原子吸收光谱法测定了不同品牌香烟中重金属的本底值、香烟吸过后过滤嘴、烟灰中重金属的总残留量.     

基于ASTER数据的烃蚀变信息增强与提取

烃类微渗漏蚀变信息是地下深部油气藏储层在地表和近地表的直观证据,通过遥感图像进行烃蚀变解译是遥感油气勘探中的一项高效、快速和安全的新技术。该研究采用ASTER近红外数据,以烃渗漏蚀变产生的碳酸盐矿物为目标,采用主成分分析、密度分割和假彩色合成等信息增强和提取方法,获得了1589-PC3、1689-PC3、1348-PC3和5689-PC2等四个对碳酸盐具有较好增强效果的主成分因子,以X+2σ为阈值,从4幅主成分因子图像上提取了碳酸盐区域,并根据叠合结果划分为一级富集区和二级富集区。结果显示碳酸盐富集与展布结果与该区的地层分布紧密相关,与已有研究的解译结果较为一致。     

广西大瑶山野生绞股蓝六种无机元素的测定

目的：对广西大瑶山野生绞股蓝茎、叶中的六种无机元素进行测定.方法：采用湿法消化法和原子吸收法进行研究.结果：广西大瑶山野生绞股蓝茎、叶中六种元素含量差异较大,叶中的含量明显高于茎中的含量,所测的六种元素的含量依次为：Ca〉Mg〉Fe〉Mn〉Zn〉Cu.结论：广西大瑶山野生绞股蓝六种无机元素的含量较为丰富,可以满足人体的需要,本研究为探讨无机元素与绞股蓝药理作用之间的关系提供了可靠的依据,为绞股蓝药物开发提供了方向.     

不同防反措施抗温度型反射裂缝性能分析

为防止及减少旧水泥混凝土路面沥青加铺层反射裂缝,目前一般采用应力吸收层或相关土工合成材料作为防反措施,本文选取目前较为流行的几种防反结构进行其抗温度型反射裂缝性能分析,供相关技术人员参考。     

浅谈水泥路面“白+黑”罩面防反射裂缝施工技术

水泥路面"白+黑"罩面的突出技术问题是如何处理好原路面对加铺的沥青面层形成的反射裂缝。通过对橡胶沥青应力吸收层、聚酯玻纤布、玻纤格栅等防反射裂缝处理技术进行分析,为水泥路面"白+黑"罩面防反射裂缝施工提供参考意见。