沙疗对骨关节炎兔子股骨骨质影响的对比研究

目的:试验研究维医沙疗对骨关节炎动物模型骨质层转移的影响.方法:采用CT扫描的手段分别四次(建立实验对象OA模型前后各一次、进沙疗第14天和第28天各一次)采集两个实验对象股骨数据.将数据导入MIMICS软件分离实验对象股骨,根据CT值范围不同把股骨分为六个骨质层并读取各层体积.分析了各骨质层的体积在股骨总骨量中所占比例的变化和股骨平均CT值的变化.结果:分析四次CT数据的变化,发现沙疗对象股骨总骨量增长,而对照对象之下降.与此同时沙疗对象股骨平均CT值上升,相比之下对照对象平均CT值下降.结论:沙疗对关节炎对象有促进骨代谢作用,使骨质从低CT值的骨质层转移至高CT值骨质层.     

AlN靶材射频磁控溅射制备AlN薄膜及性质研究

以AlN作为靶材,使用射频磁控溅射法在Si（100）和玻璃衬底上,在纯氮气气氛条件下制备得到AlN薄膜,并研究了衬底温度对溥膜的结构,形貌和性质的影响．实验表明,衬底温度为370℃的条件下制备的AlN溥膜具有C轴择优取向,薄膜表面均匀、致密和平整,均方根粗糙度为4．83nm．随着基片温度的增加,溥膜的折射率增加,对应着薄膜从非晶态到晶态过程的演变．     

Neutrino masses and flavor mixing in the Extended Double Seesaw Model with two texture zeros

We study the light neutrino mass matrix in the Extended Double Seesaw Model (EDSM), and as a result we get its general form. Also we demonstrate that conventional type-I and double seesaw mechanisms can be regarded as two special cases. We analyze the structure of the 9×9 neutrino mass matrix in this scenario, and surprisingly we find that EDSM will degenerate to a conventional type-I seesaw mechanism when \(M_{\mathrm{R}}= M_{\mathrm{S}}M_{\mu}^{-1}M_{\mathrm{S}}^{T}\) holds exactly. Considering two simple ansätze in two texture zeros for its 3×3 submatrices, we calculate the neutrino masses and flavor mixing angles, in which the θ ₁₃ is a nonzero large angle.     

纯氮气反应溅射AlN薄膜及性质研究

在不同氮气浓度、不同溅射气压和衬底温度为20～370 ℃的条件下,分别在多种衬底上采用反应磁控溅射法沉积AlN薄膜.X射线衍射图谱表明:温度大于180 ℃时可在多种衬底上沉积出具有c轴择优取向的纤锌矿AlN薄膜.衬底温度和溅射时间的增加有利于薄膜结晶性的改善. 1.5 Pa的纯氮气气氛和Si(100)衬底是最佳择优生长条件.由紫外-可见光透射谱计算得到:在石英衬底上沉积的薄膜折射率为1.80～1.85,膜厚约为 1 μm、光学能隙为6.1 eV.原子力显微镜照片表明:在Si(100)衬底上制备的薄膜表面平滑,均方根粗糙度为2.2～13.2 nm.     

基于灰色关联法的春小麦叶片含水量高光谱估测模型研究

利用高光谱植被指数反演植被水分含量时,快速、准确的找到实测光谱数据与植被水分相关性最高的植被指数是研究的重点。在农田尺度上,以春小麦野外光谱数据与叶片含水量的定量关系为基础,通过灰色关联度分析,筛选出与叶片含水量灰色关联度较高的5种典型的水分植被指数,并建立了估算春小麦叶片含水量(LWC)的偏最小二乘回归(PLSR)模型和BP神经网络(back propagation artificial neural networks, BP ANN)模型。结果表明：(1)光谱一阶导数可以有效去除噪声影响并突出光谱特征信息,尤其是在750～830,1 000～1 060和2 056～2 155 nm等区间明显提高了与LWC的相关性。(2)灰色关联法能够较好的表征各水分植被指数与叶片含水量间的关联性,其中基于原始光谱建立的前5个水分植被指数都是两波段比值植被指数,基于光谱一阶导数建立的水分植被指数基本上都是两波段归一化差值植被指数。(3)所建立的两种模型中,基于光谱一阶导数建立的PLSR和BP神经网络模型R2分别为0.80和0.81,稳定性基本相同且都较好;两种模型RMSE都是0.55,RPD分别为2.01和1.41,说明PLSR模型的预测精度比BP神经网络模型高。从模型的验证效果来看,PLSR模型在估算春小麦叶片含水量方面有一定的优势,为高光谱定量反演春小麦叶片含水量提供一定的参考。     

Photon and positron generation by ultrahigh intensity laser interaction with electron beams

This study investigates the generation of high energy photons and positrons using focused ultrahigh intensity femtosecond laser pulses on a relativistic electron beam with a set of two-dimensional particle-in-cell simulations. We consider circularly and linearly polarized, single and spatially separated double laser pulses. We model both 500 MeV and 1 GeV electron beams. Higher positron production is obtained using circularly polarized laser pulses. Using double pulses, the focusing effect of the ponderomotive force confines the electrons to a small volume, generating additional energetic photons and positrons. The positron spectral distributions are effectively modified by these variations. When the electron beam energy is doubled, the number of positrons increased, while the cutoff energy remained nearly constant.     

ResBos and ePump Analysis on ATLAS 8TeV Z Boson Transverse Momentum Distributions

International Journal of Theoretical Physics - Fixed-order predictions cannot describe the vector boson production process in low transverse momentum regions where resummation of soft gluon...     

QCD and electro-weak corrections to the production of Higgs+2 jets at the LHC

We present complete next-to-leading-order (NLO) QCD correction and electro-weak (EW) correction to the production cross section of Higgs-Boson in association with two hard quark jets by using Monte-Carlo numerical calculation program, HAWK, for various photon parton distribution functions at the Large Hadron Collider with center of mass energy 7, 8, 13, and 14 TeV without and with typical vector-Boson-fusion cuts on the tagging jets. In our calculation we include complete contribution from the full set of t-channel, u-channel and s-channel Feynman diagrams, and corresponding interferences as well as NLO QCD and EW corrections.     

Optical waveguide sensor of volatile organic compounds based on PTA thin film

In this study, a sensitive optical waveguide (OWG) sensor for the detection and identification of volatile organic compounds (VOCs) was reported. The sensing membrane is constructed by immobilization of peroxopolytungsten acid (PTA) thin film over a single-mode potassium ion (K⁺) exchanged glass OWG by spin-coating method. A laser beam was coupled into and out of the glass optical waveguide using prism couplers, and dry air functioned as a carrier gas. The sensor was tested for various volatile organic compounds (VOCs), and it showed higher response to the chlorobenzene gas compared to other VOCs. Therefore, we used the OWG sensor to detect chlorobenzene gas as a typical example of VOCs. The sensor exhibits a linear response to chlorobenzene gas in the range of 0.4-1000 ppm with rapid response and good reversibility. The constructed sensor is easy to fabricate and it has some unique qualities which can be characterized as inexpensive, sensitive, and reusable.     

纯氮气反应溅射c-轴择优取向AIN薄膜的制备及性质研究

在纯氮气气氛、衬底温度为20℃至370℃的条件下,分别在硅（100）和石英衬底上沉积氮化铝薄膜．原子力显微镜图片表明：在不同衬底温度制备的薄膜表面平滑,均方根粗糙度为2．2—13．2nm．X射线衍射图谱表明：可以在衬底温度为180°条件下沉积出具有c-轴择优取向的纤锌矿氮化铝薄膜,衬底温度的增加有利于薄膜结晶性的改善．由紫外-可见光透射谱计算得到薄膜折射率为1．80～1．85,膜厚约为1μm、光学能隙为6．1eV．