The Effect of Chinese OFDI on Energy Import in Central Asia under the Background of "the Belt and Road"

通过运用分位数引力模型研究了中国对中亚区域对外直接投资的能源进口贸易效应及影响因素。结果发现,中国与中亚区域国家的对外直接投资与能源进口之间存在显著的替代效应;人均收入水平对能源进口贸易的促进作用呈"U"型特征,能源进口产品从初级产品规模扩张向高附加值产品提质转变;地理距离对能源进口的负面影响随着条件分位点的提高呈现下降趋势,贸易投资便利化将弱化距离成本的影响。This paper uses quantile gravity model method to investigate the factor of import trade effect and influence on out- ward foreign direct investment and import of energy from China to Central Asian countries. The empirical results show that there is a significant substitutional effect between outward foreign direct investment and import of energy amongst China and Central Asian countries ; the stimulative effect of per capita income level on import of energy present a ＂U＂ shape ; the trade and investment facilitation of ＂the Belt and Road＂ will weaken the influence on cost of distance.国家社会科学基金一般项目(13BGJ024)；新疆维吾尔自治区普通高等学校人文社会科学重点研究基地兵团屯垦经济研究中心基金项目(XJEDU020214C04)；石河子大学高层次人才科研启动项目(RCSX201401)

非酒精性脂肪性肝病无创性诊断方程的构建

目的利用与非酒精性脂肪性肝病(NAFLD)相关的常用临床及实验室指标,构建无创性诊断方程,并评估该方程对NAFLD的预测及诊断价值。方法选取2016年11月-2017年11月西安医学院第一附属医院诊断为NAFLD患者127例和健康对照者30例,记录研究对象的性别、年龄、BMI、病史、ALT、AST、GGT、尿素氮(BUN)、尿酸(UA)、血肌酐(Cr)、TC、TG、HDL、LDL、糖化血红蛋白(HBA1c)、游离脂肪酸(FFA)、空腹血糖(FPG)、空腹胰岛素(FINS)、PLT、超声检查结果和Fibro Scan的检查结果等数据。计量资料组间比较采用t检验,相关性使用Pearson相关性分析,回归方程的构建使用多元线性回归方程模型,构建受试者工作特征曲线(ROC曲线),计算回归方程的敏感度和特异度。结果与脂肪肝相关的指标包括BMI(r=0.308,P=0.005)、ALT(r=0.379,P<0.001)、AST(r=0.318,P=0.004)、GGT(r=0.293,P=0.009)、UA(r=0.244,P=0.033)、FFA(r=0.249,P=0.030);对Fibroscan的受控衰减参数(CAP)相关指标进行多重回归分析,CAP的回归模型具有统计学意义(F=11.113,P<0.001),其校正决定系数R2=0.274,说明回归引起的变异在总变异中所占的比率为27.4%,对CAP影响最大的指标是ALT(β=0.358,P=0.001),其次是BMI(β=0.258,P=0.012<0.05),构建的回归方程为CAP=113.163+0.252×ALT+6.316×BMI,诊断方程的ROC曲线下面积为0.927,灵敏度为87.68%,特异度为90.00%,cut-off值为277.67,P<0.001,具有较高的诊断效能。结论与目前已有的诊断方程相比,此方程的ROC曲线下面积、特异度、灵敏度均较佳,计算方法最为简单,实用性及可操作性强,有利于便捷筛查出早期NAFLD,提高自我干预意识,进一步降低NAFLD的全球危害和疾病进程。可以作为一个诊断NAFLD的方程,供临床参考及推广。陕西省普通高等学校优势学科建设项目(陕教位[2014]3号文件

Performance Analysis of Repeat-Accumulate Codes over Shallow Water Acoustic Channels

针对浅海水声信道的强多途、长时延、严重衰落等特点,需采用性能好、能够实现线性编译码便于实时处理的信道纠错码技术以提高水声通信系统可靠性的问题,提出重复累积(rEPEAT-ACCuMulATE,rA)码作为浅海水声信道的纠错码方案。建立rA码在浅海水声信道中的仿真模型,比较其在不同浅海水声信道模型下的性能,通过水池数据传输实验研究编译码参数对rA码性能的影响,并以水下图像传输实验进一步验证该编码方案。仿真和实验结果表明:rA码在浅海水声通信系统中具有较强的纠错能力,选择合适的参数会进一步提高编码增益。与TurbO码和ldPC码的编译码复杂度对比,rA码能够实现线性时间编译码,算法复杂度低,硬件实现简单,在水声通信中具有非常好的应用前景。Due to a large delay spread caused by multipath propagation and severe attenuation of the channel conditions,the Repeat-Accumulate(RA) code with short length codes,good performance and easy implementation has been proposed to enhance the reliability of the shallow water acoustic(SWA) communication system.A system model including RA coding over the SWA channels was established.As a comparison,the performance of RA codes under different ocean acoustic channel conditions was presented.The experiment in the pool was carried out to show how the encoding and decoding parameters affect the performance of RA codes,which was verified by the image transmission over channels in the pool tank.The simulation and experimental results show that RA codes have a strong error correction capability and the codes with appropriate parameters would further improve the coding gain,while they enjoy encoding and decoding in linear time and have simple hardware implementation,which have a good applied prospect in underwater acoustic communication system.国家自然科学基金资助项目(41176032);中央高校基本科研业务费专项资金资助项目(2010121032)(20112G020);厦门大学基础创新科研基金资助项目(201112G020

苯扎贝特对体内外血小板聚集凝血口恶烷 B2 及 环 腺 苷 酸 的影 响

目的: 研究苯氧芳酸类降脂药苯扎贝特( bezafibrate)对血小板功能的影响。方法: 分别在体内、外观察 28 例高胆 固醇血症(HC)患者血小板聚集试验( PAgT)、凝血口恶烷 B2( TXB2)及环腺苷酸( cAMP)在苯扎贝特作用前后的含量变化, 并与 10 例健康体检者对照。结果: 口服苯扎贝特 8周, 血清总胆固醇( TC)、低密度脂蛋白胆固醇( LDL-Ch)水平下降,PAgT 、血小 板 TXB2 及 cAMP 含量无改变; 不同浓度的苯扎贝特( 6. 9 μmol·L-1, 69 μ mol·L-1)在体外对上述血小板功能指标无影响。结 论: 苯扎贝特在体内、外未发现有抗血小板的作用

The servo control method of a virtual microassemble system integrated CAD model

虚拟技术可克服微装配中显微视觉系统小景深、小视场的问题,但构造虚拟场景时,数据量大、效率低.利用微器件设计时的CAD数据,可减小构造虚拟环境的数据量、提高效率,能够使构造出的场景更精确.利用显微镜聚焦———失焦理论并借助于器件CAD模型构造虚拟环境;将获得的深度信息集成在伺服控制方程中.通过这些方法,可进行复杂路径的规划,完成三维微装配任务,仿真和实验结果均表明上述方法是可行的.Virtual microassembly technology can avoid the problem that the focal depth and the viewing field of microscope are too small.But when building virtual scene there are too many assembly environment data and the efficiency is lower.Using the CAD data produced by the micro-parts can reduce the amount of the environment data and improve efficiency.The virtual environment is constructed using the focus-defocus theory of microscope and the CAD model,and the depth information of microscope is integrated in the servo control equation.By these methods the complex path can be programmed and the complicated micro-assemble task can be completed.The simulation and the experimentation indicate that these methods are feasible.国家自然科学基金资助项目(50275078

五配位磷化合物与生物化学

综述了五配位磷化合物与生物化学的关系,发现当α-氨基酸的氨基接上磷酰基团以后,化学性质发生了许多奇特的现象,在室温下可发生自身活化现象而成肽、成酯、磷上酯交换及N→O磷酰基转位;丝氨酸和苏氨酸与核苷缀合以后,在弱碱性条件下能够对不同的碱基进行识别;磷酰化组氨酸和丝组二肽可以在中性条件下切割核酸、蛋白、酯.发现上述现象的发生都经历了一个五配位磷中间体,认为五配位磷中间体是决定它们活性的结构因素

高超声速飞行器多约束再入轨迹快速优化

针对高超声速飞行器再入过程中面临测控区和绕飞区的再入轨迹设计问题,提出了一种基于Gauss伪谱法(GPM)的分段轨迹优化策略。将轨迹优化的一般最优控制问题转换为多段最优控制问题,进而将各段轨迹按Gauss伪谱方法进行离散化,将连续多段最优控制问题转换为非线性规划问题(NLP)进行求解。所得再入轨迹能够使得飞行器在满足各种约束条件的情况下成功进入测控区并且有效规避绕飞区,最终到达指定点。此外,本文综合考虑飞行器再入飞行的快速性和工程实用性,并提出了再入时间、弹道倾角以及航向角相关指标的加权性能指标,同时保证了轨迹规划快速、再入轨迹平滑以及控制量变化平缓等实际需求,提高了计算效率。仿真结果表明,本文所提出的分段优化方案能够快速规划出适应不同飞行任务的再入轨迹

Matrix Pair with the Sum and Product Being Equal and Its Polynomial Denotation

用矩阵JOrdAn标准形理论,证明了和与积相等的矩阵对的JOrdAn标准形具有互为确定的性质,进而得到由和与积相等的矩阵对的最小多项式及交换子空间确定的多项式表示的新结果.Applying the theory of Jordan canonical form,we proved the properties of Jordan canonical forms of the matrix pair with the sum and product being equal are determined mutually,obtaining the new results of polynomial denotation determined by minimal polynomial and commutative subspaces.福建省自然科学基金(批准号:2010J01018); 福建省教育厅科研项目基金(批准号:JA12286;JA08196); 福建省高校服务海西建设重点项目(批准号:2008HX03

Template Synthesis and UV-Vis Absorption Spectra of the Nanowire Arrays of Cadmium Chalcogenides

以多孔氧化铝为模板 ,用交流电分别通过含有相应的CdCl2 、ZnCl2 、单质S、Se等的二甲亚砜 (DMSO)溶液 ,沉积CdS、CdSe以及CdxZn1-xS半导体纳米线阵列并研究其紫外可见吸收光谱 .实验结果表明 ,当半导体纳米线的直径小于 2 5nm时 ,其吸收边相对于体相的吸收边产生蓝移 ,而且蓝移的幅度随着半导体纳米线直径的减小而增加 ,显示了明显的量子限域效应 .XU Shi_min, XUE Kuan_hong , KONG Jing_lin, SUN Dong_mei, FENG Yu_ying, LU Hai_yan (Dept. of Chem., Nanjing Normal Univ., Nanjing 210097, China) WANG Guang_hou (National Laboratory of Solid State Microstructures, Nanjing Univ., Nanjing 210093, China)The porous alumina membrane formed in the anodic oxidation of highly pure aluminum foil has attracted a great deal of attention in recent years [1] . It can be served as a desired template to prepare nanometer scale materials [2] due to its unique structure of discrete and cylindrical nanopores, paralleled one another, with the homogeneous size and distribution [3] . Chalcogenide semiconductors have promising prospect in the applications of photovoltaic [4] and photoconducting devices [5] and have been extensively exploited for many years. Olbright and his co_workers studied experimentally and theoretically the optical nonlinearties of CdS xSe 1-x _doped glass [6] ; Britt and Ferekides reported that the conversion efficiency in a solar cell of thin_film CdS/CdTe could be as high as 15.8% [7] . Here we report the fabrication and UV_Vis absorption spectra of CdS、CdSe and Cd xZn 1-x S nanowire arrays deposited into the template matrix of porous alumina. The diameters of these nanowires were varied from 10 nm to 50 nm in our experiments.作者联系地址：南京师范大学化学系!江苏南京210097,南京师范大学化学系!江苏南京210097,南京师范大学化学系!江苏南京210097,南京师范大学化学系!江苏南京210097,南京师范大学化学系!江苏南京210097,南京师范大学化学系!江苏南京210097,南京大学固体微结构国家重点实验室!江苏南京21009

基于均匀设计的祛湿化瘀复方抗脂毒性作用的主效应中药分析

目的观察祛湿化瘀复方的主效应中药或不同组合对游离脂肪酸(free fatty acid,FFA)诱导人肝癌细胞株(HepG2)细胞脂肪沉积和肿瘤坏死因子α(turmor necrosis factor α,TNF-α)分泌的作用,探索中药复方药理作用相应物质基础的分析方法。方法采用FFA诱导HepG2细胞脂肪沉积和TNF-α分泌的体外细胞模型和药物血清技术,运用数学模型"均匀设计法",根据复方中的5味中药(茵陈、栀子、虎杖、田基黄、姜黄),选用U11(1110)表进行组方设计所得10种中药组合进行干预,以对甘油三酯(triglyceride,TG)及TNF-α的抑制效应作为考察指标,筛选主效应中药或组合,并重新区间分组验证。结果茵陈和田基黄在高剂量组合时有显著降低细胞TG及TNF-α含量的效应,与全方比较差异无统计学意义,其中单用茵陈也可显著降低细胞TG及TNF-α含量。结论茵陈及其与田基黄的组合是祛湿化瘀复方抑制FFA诱导HepG2细胞脂肪沉积和TNF-α分泌作用的主效应中药;应用均匀设计与药效学分析的方法可有效分析中药复方针对某一作用环节的主效应中药或组合