浅谈高压喷射灌浆技术施工作用机理及注意事项

本文主要介绍高压喷射灌浆技术作用的机理,由于结构物材质较盖,承载力低,渗透性较强,影响水工建筑物的稳定性,本文讨论了高压喷射灌浆的机理及运用中的工艺参数的确定及防渗效果.     

冶金热工过程的热像图分析

介绍了冶金热工测试中的红外成像测试原理，通过几种应用实例分析了红外成像技术和热像图分析方法在热工过程分析中的应用特点和适用范围。     

浅析朝鲜族文化中的设计观念

朝鲜族文化深受中国的汉文化以及日本、西方等文化的影响,但在周围大国环饲的情况下,发展出自己独特的个性和气质。文章尝试对朝鲜族文化中的设计观念从文化背景、来源和基本特征等方面进行简要的梳理和分析。     

Carbon Nanotubes: Biocompatibility of Immobilized Aligned Carbon Nanotubes (Small 8/2011)

In vivo host responses to an electrode‐like array of aligned carbon nanotubes (ACNTs) embedded within a biopolymer sheet are reported. This biocompatibility study assesses the suitability of immobilized carbon nanotubes for bionic devices. Inflammatory responses and foreign‐body histiocytic reactions are not substantially elevated when compared to negative controls following 12 weeks implantation. A fibrous capsule isolates the implanted ACNTs from the surrounding muscle tissue. Filamentous nanotube fragments are engulfed by macrophages, and globular debris is incorporated into the fibrous capsule with no further reaction. Scattered leukocytes are observed, adherent to the ACNT surface. These data indicate that there is a minimal local foreign‐body response to immobilized ACNTs, that detached fragments are phagocytosed into an inert material, and that ACNTs do not attract high levels of surface fouling. Collectively, these results suggest that immobilized nanotube structures should be considered for further investigation as bionic components.     

三元乙丙橡胶的热老化行为及其BP神经网络预测

通过对三元乙丙橡胶(EPDM)橡胶在70℃、80℃和90℃3个温度下的高温加速老化实验,测试其拉伸强度,断裂伸长率和压缩永久变形的物性值的保持率。建立了EPDM的热老化时间与其3种物性值之间的热老化行为规律关系。结果表明:以3种物性为基础,利用Arrhenius作图法推算出23℃下EPDM橡胶材料的使用寿命分别为316年、158.5年、78.5年。同时,利用BP神经网络预测EPDM橡胶在3个温度下的热老化行为,预测结果误差分别为10-3、10-4、10-5。     

MOS hydrogen sensor with very fast response based on ultra-thin thermal SiO2 film

An MOS capacitor-type hydrogen gas sensor was fabricated with the structure of Ni/SiO₂/Si by using conventional silicon wafer technologies. Grown by dry oxidation at 900°C, the thickness of the SiO₂ film was only 24 Å. At 150°C, comparing to another MOS capacitor with 148 Å-thick oxide and otherwise identical configurations, this sensor showed much faster response speed (the time interval to reach half of the magnitude of the steady-state signal, or t_50%, was only 4 s in response to 1% H₂ without deduction of the delay from the gas delivery system), as well as enhanced signal magnitude (about two times of the former for 1% H₂). Based on the hydrogen-binding to the traps in the bulk SiO₂, a mechanism was proposed to explain the very short response time on the device with the ultra-thin SiO₂. The gate leakage in the device is also discussed. The presented sensor demonstrates a promising step in designing low-cost H₂ detectors with very fast responses.     

A first-principles study on the electromechanical effect of graphene nanoribbon

The electromechanical effect of graphene nanoribbons (GNRs) is investigated via a first-principles method. The deformations of GNRs with zigzag shaped edges (ZGNR) and armchair shaped edges (AGNR) are considered. The nonlinear stress–strain relations are found for both of the AGNRs and the ZGNRs. The AGNRs seem to be stiffer than the ZGNRs as concluded from inspecting the Young's modulus and the ideal strength of GNRs. It is found that a mechanical deformation will affect the electronic structures of GNRs. The band gap of AGNRs exhibits sawtooth oscillations under strains and the oscillating strength is up to 1 eV. On the contrary, the band gap of ZGNRs is insensitive to strain. However, the band gap of ZGNRs will be reduced dramatically to zero as the compressive strain is greater than 0.17. The large variation of the band gap of AGNRs under strain indicates that deformation can provide an opportunity for tuning the band gap of an AGNR.     

Increased sialylation of polymeric immunoglobulin A1: mechanism of selective glomerular deposition in immunoglobulin A nephropathy?

Monoclonal antibodies which recognize antigenic determinants expressed by T-cells and Ig-bearing cells, respectively, allowed lymphocyte subpopulations involved in allograft rejection of muscle transplants to be identified in the teleost fish Dicentrarchus labrax (L.). The monoclonal antibody DLT15 first allowed recognizing T-cells involved in an in vivo antigen-driven cellular response in teleosts. Immunohistochemical studies showed a high density of lymphocytes in allografts and provided evidence of predominance of T-cells. The heterogeneity of the cell populations recognized by the antibodies was evidenced by the different size, cytology, and staining patterns of T-cells and Ig-bearing cells.     

Generalized Multiframe Tasks

A new model for sporadic task systems is introduced. This model— the generalized multiframe task model—further generalizes both the conventional sporadic-tasks model, and the more recent multiframe model of Mok and Chen. A framework for determining feasibility for a wide variety of task systems is established; this framework is applied to this task model to obtain a feasibility-testing algorithm that runs in time pseudo-polynomial in the size of the input for all systems of such tasks whose densities are bounded by a constant less than one.     

Whitening prefiltered TLS linear predictor for frequency estimation

A new total least squares (TLS) technique for linear prediction based on a whitening procedure is presented. This technique can solve the problems due to the bias inherent in the prefiltered TLS solution so as to give a good performance over a wide range of SNRs, thereby outperforming common TLS solutions