保康城区大堰小区滑坡成因机制及演变趋势探讨

从滑坡的环境条件、形态特征与变形特征入手,对滑坡成因机制、稳定性进行分析研究。滑坡区后期建房切坡及农田改造形成的多级陡坎,为变形提供了良好的临空条件,在降雨入渗及重力作用下,变形逐步加剧,并最终导致滑坡复活。通过滑坡稳定性定性与定量评价认为,滑坡目前处于缓慢加速变形阶段,一旦条件成熟,可能发生整体破坏。针对滑坡稳定现状,提出了有针对性的防治措施建议。     

STUDY OF THE ANODIZATION OF Al FILM ON InP SUBSTRATE AND ITS PROPERTIES

The anodization of Al film on InP substrate and properties of anodic Al_2O_33/InPhave been investigated by AES,DLTS,I-V,C-V and ellipsometer.The results show that theanodic oxide Al_2O_3 has a permittivity of 11～12 and a resistivity of 1.3×10~(13) ohm-cm.Interfacestate density at Al_2O_3/InP is about 10~(11) cm~(-2)·eV~(-1).DLTS reveals that there is a continuouslydistributed interface electron traps at Al_2O_3/InP interface.Anodic Al_2O_3 exhibits good stabilityand electrical properties and could be used for passivation,diffusion mask and gate insulator,etc.     

热解解毒铬渣处理水中磷酸盐的应用

采用600℃和800℃下的两种热解解毒铬渣处理模拟含磷废水,研究了最佳反应条件,并探讨了解毒铬渣除磷的机理。结果表明,热解解毒后铬渣的浸出毒性大幅降低,当磷浓度为50 mg/L时,选择投加量为2.5 g/L,振荡接触时间为2 h。磷分级试验结果表明,解毒铬渣除磷机理主要是溶出金属离子的沉淀作用,从铬渣中溶出的Ca~(2+)含量和平衡溶液pH值对除磷效率有较大影响,铬渣在碱性条件下处理效果较好,适宜处理中性和碱性含磷废水。     

武汉市某公路工程桩基施工引发岩溶地面塌陷形成机制及防治措施

武汉市某公路工程在钻孔和桩基施工过程中,冲击振动成孔引起覆盖层砂土液化、漏失,先后引发了6次路面塌陷,造成交通堵塞、自来水中断等系列后果。阐述该地区岩溶塌陷形成的条件,并分析工程建设引发岩溶地面塌陷的机制,提出相应的防治措施。     

通过InGaAsP外延层的InP深Zn扩散理论与实验研究

研究了Zn在InP、InGaAsP以及InGaAsP/InP中的扩散,扩散结深均与时间的平方根成正比.对于InGaAsP/InP单异质结,扩散结深还与InGaAsP覆盖层的厚度x_0有关.推导出其结深与扩散时间的函数关系为x_j/t~(1/2)=-x_0/(rt~(1/2))+I.     

Correlation analysis of hyperspectral imagery for multispectral wavelength selection for detection of defects on apples

Visible/near-infrared reflectance spectra extracted from hyperspectral images of apples were used to determine wavelength pairs that can be used to distinguish defect regions from normal regions on the apple surface. The optimal wavelengths were selected based on correlation analysis between the wavelength band ratio (λ₁/λ₂) or difference (λ₁ − λ₂) and the assigned value for the surface condition (0 = normal, 1 = defect). Spectral images of apple surfaces at the selected wavelengths were used to validate the correlation analysis. The correlation coefficients obtained using the correlation analysis for band ratio and difference were 0.91 and 0.79, respectively. When applied to the set of apple images, the band ratio model correctly identified 195 of the 211 defects on a set of 70 Fuji apples containing at least one defect region. Thus, the correlation analysis was demonstrated to be a feasible method for selecting wavelength pairs for use in distinguishing defects from areas without defects on apples.     

嵌入式工作流系统集成方案研究

企业中大多数的业务应用系统,为了更好地实现业务之间的协调工作,将工作流引擎嵌入到系统中,使其成为应用系统的一个软件组件.为了整合企业内部多个不同的业务应用,使其能够协调工作实现业务资源共享,在充分利用业务应用系统中的工作流组件基础上,开发了一个应用系统插件.通过插件的引入达到企业内部各独立业务应用系统间的轻量级无缝集成.     

水中常见离子对解毒铬渣除磷的影响

研究了几种常见离子(NO_3~-、SO_2~(4-)、HCO_3~-、SiO_3~(2-)、Ca~(2+)和Mg~(2+))对2种解毒铬渣(600℃和800℃热解解毒)除磷效果的影响.结果表明,与纯水比较,NO_3~-(NaNO_3)和SO_4~(2-)(Na_2SO_4)的存在能提高解毒铬渣的磷去除率;HCO_3~-(NaHCO_3)和SiO_3~(2-)(Na_2SiO_3)会与水中的PO_4~(3-)竞争Ca~(2+)生成沉淀,从而对铬渣除磷起抑制作用;Ca~(2+)和Mg~(2+)的存在能够提高铬渣的除磷率.根据上述结果及水、污水中一般离子含量,初步分析认为对铬渣固磷影响最大的应该是Ca~(2+)、Mg~(2+)和HCO_3~-(CO_3~(2-))离子,前2者起促进作用,后者起抑制作用.     

Characterization of engine oil additive packages on diesel particulate emissions

This study investigated the impact of engine oil formulation on particulate matter (PM) characteristics from a light-duty diesel engine. The test engine was a 1.6 L Euro-5 diesel engine operated from low- to high-speed and high-load conditions. Specially formulated nonadditive containing base oil and genuine oil were evaluated. For diesel PM characterization, physicochemical analytic procedures were conducted on engine oil formulation, oil flushing, PMs sampling, morphology, and particle constituent determination. Size-resolved particle number (PN) concentration at the engine-out position was evaluated by differential mobility spectrometer (DMS). Nucleation mode particles originating from engine oil consumption during the expansion stroke had a higher concentration from genuine oil than those from base oil. Scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS) were used to analyze the morphology patterns and atomic compositions with engine oil packages. From the SEM analysis, spherical PM of nucleation and accumulation mode particles were agglomerated on a quartz filter. In the XPS spectrum, more engine oil additive fractions of Ca, P, and Zn were found in the PM sample from genuine oil. In conclusion, the variation of physicochemical engine oil properties and additive amounts had strong contributions to engine oil derived PN emissions, morphology, and additive metal compositions in the exhaust gas stream.

     

Effect of engine control parameters on combustion and particle number emission characteristics from a SIDI engine fueled with gasoline-ethanol blends

Journal of Mechanical Science and Technology - In this study, the impact of engine control parameters on combustion behaviors and particle number emissions was investigated with a spark ignition...