基于WebGIS高速公路应急指挥关键技术研究

随着我国高速公路建设的扩大,各类交通事故也明显增多,为了避免各种突发事故带来更大的经济损失与人员伤亡,本文在总结以往救援工作的基础上,将WebGIS空间分析技术中的缓冲区分析、叠加分析、统计分析与视频监控等关键技术综合应用于高速公路应急指挥体系中,实现救援物资可视化与事发现场信息的实时反馈,从而提高应急指挥系统在紧急救援方面的效率。     

Effects of Substrate Hydrophobicity/Hydrophilicity on Height Measurement of Individual DNA Molecules

Effects of substrate hydrophobicity/hydrophilicity on height measurement of individual ds-DNA molecules are investigated with tapping mode atomic force microscopy （TMAFM） and vibrating mode scanning polarization force microscopy （VSPFM）. The measured heights of ds-DNA on hydrophobic highly oriented pyrolytic graphite （HOPG） are remarkably less than those on hydrophilic bare mica and Ni^2＋ treated mica in both TMAFM and VSPFM. By analysing the results, we propose that the hydrophobicity/hydrophilicity of substrate can greatly influence the height measurement of DNA molecules.     

Thermodynamics of the Apparent Horizon in FRW Universe with Massive Gravity

Applying Clausius relation with energy-supply defined by the unified first law of thermodynamics formalism to the apparent horizon of a massive gravity model in cosmology proposed lately, the corrected entropic formula of the apparent horizon is obtained with the help of the modified Friedmann equations. This entropy-area relation, together with the identified Misner-Sharp internal energy, verifies the first law of thermodynamics for the apparent horizon with a volume change term for consistency. On the other hand, by means of the corrected entropy-area formula and the Clausius relation δQ=TdS, where the heat flow δQ is the energy-supply of pure matter projecting on the vector ξ tangent to the apparent horizon and should be looked on as the amount of energy crossing the apparent horizon during the time interval dt and the temperature of the apparent horizon for energy crossing during the same interval is 1/(2πA), the modified Friedmann equations governing the dynamical evolution of the universe are reproduced with the known energy density and pressure of massive graviton. The integration constant is found to correspond to a cosmological term which could be absorbed into the energy density of matter. Having established the correspondence of massive cosmology with the unified first law of thermodynamics on the apparent horizon, the validity of the generalized second law of thermodynamics is also discussed by assuming the thermal equilibrium between the apparent horizon and the matter field bounded by the apparent horizon. It is found that, in the limit Hc→0, which recovers the Minkowski reference metric solution in the flat case, the generalized second law of thermodynamics holds if α3+4α40. Without this condition, even for the simplest model of dRGT massive cosmology with α3 =α4 =0, the generalized second law of thermodynamics could be violated.     

房地产企业住宅商品房开发建设成本控制研究

随着我国现代经济政策的不断调整和社会结构的不断变革,对于房地产行业的宏观调控和人口结构控制都存在较大的限制性.随着人们生活水平的不断提高,对房地产的需求逐渐提升.在这个过程中,社会经济结构不断变化,房地产企业所建设的住宅商品房价格持续升高,也就使得整个房地产行业的利润居高不下.在目前的经济整体结构来看,房地产开发企业体...     

后置拉结筋技术质量保证

采用框架柱后置拉结筋技术,避免了传统预埋拉结筋因混凝土施工时,由于振捣等原因而造成的预埋拉结筋位置不准确,不用为寻找拉结筋而剔凿混凝土,可以保证混凝土结构表面观感质量,做到文明施工方便墙体砌筑。     

CO2分子的屈曲

用分子动力学方法模拟了CO2线形分子在纵向压力作用下的屈曲,与连续介质弹性稳定理论得到的计算结果一致.     

对双曲线中点弦的探讨

例题已知双曲线x~2-y~2/2=1,试问过点A(1,1)能否作直线l,使它与双曲线交于M、N两点,且点A是线段MN的中点?解设M(x_1,y_1),N(x_2,y_2)则①-②得(x_1~2-x_2~2)-(y_1~2-y_2~2)=0,∴k_(MN)=(y_1-y_2)/(x_1-x_2)=(2(x_1 x_2)/(y_1 y_2)=2．     

InGaAs/GaAs应变脊形量子线分子束外延非平面生长研究

提出了新型InGaAs/GaAs应变脊形量子线结构．这种应变脊形量子线结合了非平面应变外延层中沿不同晶向能带带隙的变化、非平面生长应变层In组分的变化,以及非平面外延层厚度的变化等三方面共同形成的横向量子限制效应的综合作用．在非平面GaAs衬底上用分子束外延生长了侧面取向为（113）的脊形AlAs/In GaAs/AlAs应变量子线．用10K光致荧光谱测试了其发光性质．用Kronig-Penney模型近似计算了这种应变脊形结构所具有的横向量子限制效应,发现其光致荧光谱峰位的测试结果,与计算结果相比,有10meV的“蓝移”．认为这一跃迁能量的“蓝移”是上述三方面横向量子限制效应综合作用的结果关键词：