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Search Results: 1 - 10 of 60439 matches for " XIE XIAO-XIANG "
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Microstructure of Nacre Layers in H. cumingii Lea Shell and the Characters of Nacreous Biocoatings
三角帆蚌珍珠质层结构和珍珠质涂层的研究

XIE Lei,WANG Xiao-Xiang,LI Jian,
谢雷
,王小祥,郦剑

无机材料学报 , 2008,
Abstract: 利用扫描电镜和光学显微镜对三角帆蚌贝壳和珍珠的珍珠质层微观结构进行了分析研究,发现贝壳的珍珠质层中存在异常的结构带,主要有柱状珍珠质带,针状晶体带以及棱柱状晶体带.其中柱状珍珠质带中,单片文石板片的厚度超过1μm,是正常珍珠质中文石板片厚度的两倍.而对正常珍珠的珍珠质层的大量观察却未发现类似的异常结构.分析认为这可能是因为贝壳珍珠质的矿化微环境与珍珠的珍珠质矿化微环境不同导致的.并利用圆柱形珍珠囊在钛金属牙种植体表面制备的珍珠质涂层具有沿整个圆周面均匀生长的特点.
SELECTIVE PHOTODISSOCIATION OF AMMONIA AT 000 AND 201 BANDS
氨分子在000和201带的选择光离解

XIE XIAO-XIANG,J BIESNER,K H WELGE,
解笑湘
,J. BIESNER,K. H. WELGE

物理学报 , 1988,
Abstract: 本文利用脉冲紫外激光(UV)选择激发氨分子到?1A″2电子激发态的两个最低振动能级ν′2=0和ν′2=1(ν2振动),然后检测新生态H原子的飞行谱(TOF),研究了氨分子的光碎片动力学。光谱证实了最近所测的离解能D00(H-NH2)=4.645eV;绝大多数生成的NH2(X2B1)基处于非振动激发,但是具有围绕a惯性轴的高度转动激发。通过NH3(?)的ν′2=1光离解产生的NH2(X)基具有较高的内部激发,并且显示了在N=Ka转动能级上的反转布居。
Transient Analysis of Piston Secondary Motion and Piston Skirt Friction
活塞二阶运动及活塞裙部摩擦的瞬态分析

ZHANG Zhi-nan,ZHANG Xiao-xiang,LI Xiang,XIE You-bai,
张执南
,张效翔,李响,谢友柏

摩擦学学报 , 2010,
Abstract: To better understand the piston secondary motion and tribological behaviors under different operating conditions, this paper presented a coupling model of the piston secondary dynamics and the fluid dynamic lubrication. Effects of the variation in the system inertia were considered in the model to study the transient behavior of piston secondary motion and piston skirt friction and friction loss. The variations of the engine speed, the piston secondary motion and piston skirt friction loss in the startup were simulated. The piston lateral motion and the piston skirt friction force in the startup and in the steady-state were analyzed. Results showed that the model can be applied to transient study the piston secondary motion and the piston skirt tirbological behavior.
THE PHOTODISSOCIATION DYNAMICS OF CYANAMIDE AT 193 nm
氨基氰分子在193nm的光离解动力学

XIE XIAO-XIANG,I A MCLAREN,J B HALPERN,W M JACKSON,
解笑湘
,I. A. MCLAREN,J. B. HALPERN,W. M. JACKSON

物理学报 , 1987,
Abstract: 本文研究了氨基氰分子(H2NCN)的光离解动力学。利用激光诱导荧光技术(LIF)检测了这一分子在193nm下光解所生成的CN(X2Σ+)基,在激光能量为0.35mJ/脉冲的条件下,CN(X)基的LIF信号十分弱,其0—0带的转动温度为1590±90K;当激光能量较高时,LIF信号明显增加,并观察到=2能级上的布居。在50℃的温度下,本实验测量了氨基氰分子的紫外吸收光谱,在193nm其吸收截面小于2.4×10-19cm2。二次光解机理可用来解释本实验的结果。
A Fast Wind Vector Search Algorithm for Ocean Surface Wind Retrieval
一种海面风场反演的快速风矢量搜索算法

XIE Xue-tong,FANG Yu,CHEN Ke-hai,CHEN Xiao-xiang,
解学通
,方裕,陈克海,陈晓翔

遥感学报 , 2006,
Abstract: Based on the MLE(Maximum Likelihood Estimation) algorithm for SeaWinds scatterometer wind retrieval and according to the general distribution characteristics of its objective function,a fast wind vector search algorithm is described and realized in this paper.Using some SeaWinds L2A data,the fast algorithm is validated and compared with the ordinary one.The results indicate that the fast algorithm is more efficient than the ordinary one without reducing the retrieval accuracy.
Ocean surface wind retrieval based on atlas properties
SeaWinds散射计海面风场的几何反演算法

CHEN Xiao-xiang,DAI Yong-si,WU Bo,XIE Xue-tong,
陈晓翔
,戴泳斯,吴 波,解学通

遥感学报 , 2009,
Abstract: By analyzing the law of Sigma variation with wind speed and relative azimuth, a new approach based on atlas properties is derived in this paper. The approach is different from traditional ones which are ranging methods based on least probability error. Without the need of variance, it can retrieve sea wind just by atlas information. 218623 data were in the experiment, and it turned out that the wind vector result was close to L2B data. Mean relative error of wind speed is 7.4%, and mean error of wind direction is 9.5°.
Allelopathic effects of essential oil from Eucalyptus grandis×E urophylla on pathogenic fungi and pest insects
巨尾桉挥发油对真菌和昆虫的化感作用

LIU Xiao-xiang,CHEN Qiu-bo,WANG Zhen-hui,XIE Long-lian,XU Zhi,
刘小香
,陈秋波,王真辉,谢龙莲,徐志

生态学杂志 , 2007,
Abstract: 对巨尾桉挥发油对真菌和昆虫的化感潜力及其化学成分进行了研究.结果表明,巨尾桉油乳液对真菌和昆虫均有抑制作用.随着巨尾桉油乳液浓度的增大,其对病原真菌(真菌粉蕉枯萎病菌、水稻稻瘟菌、香蕉胶胞炭疽菌和胡椒疫霉病菌)和有害昆虫(斜纹夜蛾和棉铃虫)的取食和化蛹的抑制作用明显增强.用GC/MS联用方法,对巨尾桉挥发油进行鉴定,相对百分含量在3%以上的化合物有:α-蒎烯(13.63%)、别罗勒烯(43.22%)、γ-萜品烯(5.49%)、(E)-3,7-二甲基-2,6-辛二烯醇(3.58%)、β-小茴香醇(4.58%)和2-氨基-3,5-二氰基-6-(4-甲氧基苯氧基)-吡啶(3.67%).萜烯类化合物在巨尾桉挥发油对真菌和昆虫的抑制活性中起主要作用,巨尾桉人工林生物多样性较低可能与其化感活性有关.
DISSOCIATIVE ATTACHMENT OF ELECTRONS TO C12
电子对Cl2的离解附着

Xie Xiao-xiang,Sun Yu-liang,Sha Guo-he,Zhang Cun-hao,
解笑湘
,孙玉亮,沙国河,张存浩

物理学报 , 1982,
Abstract: Rate constants of electron-attachment to Cl2 in mixtures of Ar/Cl2 have been measured over the mean electron energy range 3-5 eV. The results show that electron-attachment rate constant is (3.2±0.4)×10-10cm3/sec at a mean energy of 3.5eV. The effect of variation of the mean electron energy has also been investigated. The experimental results agree very well with that of Los Alamos investigators.
重复咬合干扰对大鼠咬肌痛觉敏感的易化作用
Repetitive Occlusal Interference Facilitates Masseter Hyperalgesia in Rats

莫思怡, 徐啸翔, 曹烨, 颉慧菲, 谢秋菲
MO Si-yi
, XU Xiao-xiang, CAO Ye, JIE Hui-fei, XIE Qiu-fei

- , 2018, DOI: 10.13701/j.cnki.kqyxyj.2018.03.013
Abstract: 摘要 目的: 分析初次咬合干扰对再次咬合干扰致大鼠咀嚼肌痛觉敏感的影响。方法: 于大鼠右上第一磨牙粘固0.4 mm厚金属冠,建立咬合干扰;初次干扰2 d后去除,再次干扰2 d或4 d后去除,测试2次干扰前后多个时间点双侧咬肌机械摆头阈值。结果: 初次干扰2 d去除后阈值需8 d恢复至基线;初次干扰2 d 后再次干扰2 d去除,阈值需10 d恢复至基线;初次干扰2 d后再次干扰4 d去除,阈值需19 d恢复至基线;初次假手术后再次干扰4 d去除,阈值仅需12 d恢复至基线。结论: 初次咬合干扰2 d对再次咬合干扰2 d 、4 d致咬肌痛敏有易化作用,表现在延长了再次咬合干扰致咬肌痛敏的恢复时间。本研究成功建立了重复咬合干扰易化咀嚼肌痛敏的动物模型
Estimation of High Dynamic Doppler Frequency and Its Cramer-Rao Bounds
高动态多普勒频率估计及其Cramer-Rao界

Wang Xiao-xiang,
王晓湘

电子与信息学报 , 2004,
Abstract: The Doppler frequency of received signal is calculated by a Taylor series, the Cramer-Rao bounds on the estimation error is Derived and analyzed; The estimation techniques as Maximum Likelihood Estimator(MLE) and Extended Kalman Filter(EKF) are compared; Their basic frequency error performance and probability of loss-of-lock at various signal-to-noise ratios is compared by tracking a common simulated high-dynamic trajectory.
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