物联网技术在智能建筑中的应用研究

近年来物联网迅猛发展,其在智能建筑中有较广泛的应用。本文首先回顾了物联网和智能建筑的发展现状,然后探寻了BIM与物联网之间的逻辑关系和两者融合所产生的巨大价值及对建筑业的深刻影响,最后展望了物联网技术在智能建筑中的应用前景。     

Multifunctional Coordination Polymer Nanoparticles Based on Allantoin: Single Peak Upconversion Emission,Drug Delivery and Cytotoxicity Study

In this work, multifunctional coordination polymer (CP) nanoparticles with strong single peak upconversion emission and high drug loading capacity were prepared via a facile solvothermal method. Various experimental parameters, such as reaction time, reaction temperature and reagent concentration were studied in detail. A series of measurements were carried out to characterize the product. Results show the CP particles with a mean diameter of approximately 80 nm can be prepared by finely selecting the preparation conditions. Strong single peak upconversion emission centering at 675 nm is observed on excitation with 980 nm laser. Drug loading and releasing experiments reveal that the CP nanospheres have a loading capacity of 200 mg/g and 50.3 % of the loaded fluorescein isothiocyanate can be released in 18 h. Cytotoxicity study displays that the CP nanospheres are biocompatible.     

球磨双闭路工艺生产超细钢渣微粉的实践

2014年JTC公司投产建成一条处理80万t/a钢渣微粉生产线,原料为当地炼钢厂外排的一种转炉钢渣。为节省投资,经多方论证,该公司利用原有的两台球磨机组成了分段粉磨、过程分选和精粉回路除铁的双闭路粉磨工艺。该项目已取得成功实践,为钢渣的资源化利用找到了一条切实可行的方法。     

Exploiting the Plackett–Burman design to examine the formulation effect on curing characteristics of oil palm ash-filled acrylonitrile butadiene rubber compounds

The present paper is focused on exploiting Plackett–Burman design to examine the formulation effect of various chemical components content on the curing characteristics of oil palm ash (OPA)-filled acrylonitrile butadiene rubber (NBR) compound. The filled-NBR compound was prepared by conventional laboratory-sized two roll mill and cured using sulfuric system. Six independent variables such as content of zinc oxide, stearic acid, N-isopropyl-N′-phenyl-p-phenylenediamine, N-cyclohexyl-2-benzothiazole sulfenamide (CBS), sulfur, and even OPA filler were carried out to screen their significant effect on the curing characteristics of NBR compound. The scorch time, optimal cure time, minimum torque, and maximum torque were selected as a response. Results showed that the scorch time and the optimal cure time were significantly affected by CBS, whereas the minimum torque and maximum torque were significantly affected by OPA and sulfur, respectively, within the studied range. Among the chemical components under study, zinc oxide and stearic acid had the least effect on the curing properties of NBR compound. Analysis of variances for all factorial models demonstrated that the model was significant with P value <0.05 while the regularity (R ²) of all models was greater than 0.9. Lastly, the optimal chemical concentrations were predicted to acquire the optimal condition of the curing system for filled-NBR compound.     

MicroRNA-378 Alleviates Cerebral Ischemic Injury by Negatively Regulating Apoptosis Executioner Caspase-3

miRNAs have been linked to many human diseases, including ischemic stroke, and are being pursued as clinical diagnostics and therapeutic targets. Among the aberrantly expressed miRNAs in our previous report using large-scale microarray screening, the downregulation of miR-378 in the peri-infarct region of middle cerebral artery occluded (MCAO) mice can be reversed by hypoxic preconditioning (HPC). In this study, the role of miR-378 in the ischemic injury was further explored. We found that miR-378 levels significantly decreased in N2A cells following oxygen-glucose deprivation (OGD) treatment. Overexpression of miR-378 significantly enhanced cell viability, decreased TUNEL-positive cells and the immunoreactivity of cleaved-caspase-3. Conversely, downregulation of miR-378 aggravated OGD-induced apoptosis and ischemic injury. By using bioinformatic algorithms, we discovered that miR-378 may directly bind to the predicted 3′-untranslated region (UTR) of Caspase-3 gene. The protein level of caspase-3 increased significantly upon OGD treatment, and can be downregulated by pri-miR-378 transfection. The luciferase reporter assay confirmed the binding of miR-378 to the 3′-UTR of Caspase-3 mRNA and repressed its translation. In addition, miR-378 agomir decreased cleaved-caspase-3 ratio, reduced infarct volume and neural cell death induced by MCAO. Furthermore, caspase-3 knockdown could reverse anti-miR-378 mediated neuronal injury. Taken together, our data demonstrated that miR-378 attenuated ischemic injury by negatively regulating the apoptosis executioner, caspase-3, providing a potential therapeutic target for ischemic stroke.     

Investigations of Local Corrosion Behavior of Plasma-Sprayed FeCr Nanocomposite Coating by SECM

FeCr alloy coating can be sprayed on low-carbon steel to improve the corrosion resistance because of FeCr alloy’s high anti-corrosion capacity. In this paper, Fe microparticles/Cr nanoparticles coating (NFC) and FeCr microparticles coating (MFC) were prepared by atmospheric plasma spraying and NFC was heat-treated under hydrogen atmosphere at 800 °C (HNFC). EDS mapping showed no penetration of Ni in MFC and NFC while penetration of Ni occurred in HNFC. X-ray diffraction results indicated the form of the NiCrFe (bcc) solid solution in HNFC. SECM testing in 3.5 (wt.%) NaCl revealed that the anti-corrosion capacity of NFC improved compared with MFC, while HNFC improved further.     

激光共焦显微光束的偏转扫描

为了提高激光共聚焦系统的扫描速度,本文提出一种逐场扫描的场同步扫描方法。构建了激光共焦显微系统,将美国THORLABS公司的GVS002型二维检流计振镜应用于该系统,根据光学系统参数以及扫描范围要求计算振镜的整场扫描波形。借助NI公司的PCIe6353多功能数据采集卡,输出行同步的扫描波形,同时,对共焦显微系统共焦位置上针孔处的光强信号进行采集,先后扫描一幅256×256和512×512的图像,记录扫描图像和成像时间;然后,在相同的硬件结构下,以场同步的方式输出扫描波形,记录扫描图像和成像时间。实验结果表明:场同步方式扫描256×256图像的速度可提高10倍,扫描512×512图像的速度可提高5倍,且满足共焦显微成像的清晰、抗干扰能力强等要求。与行同步扫描方法相比,场同步扫描方法可以消除行与行之间转换的停留时间,在不改变硬件的情况下大幅提高扫描速度。     

V-promoted Ni/Al<Subscript>2</Subscript>O<Subscript>3</Subscript> catalyst for synthetic natural gas (SNG) production: Catalyst preparation methodologies

The effect of preparation method on the catalytic performance of V-promoted Ni/Al₂O₃ catalysts for synthetic natural gas (SNG) production via CO methanation has been investigated. The Ni-V/Al₂O₃ catalysts were prepared by co-impregnation (CI) method, deposition precipitation (DP) method as well as two sequential impregnation (SI) methods with different impregnation sequence. Among the prepared catalysts, the one prepared by CI method exhibited the best catalytic performance due to its largest H₂ uptake and highest metallic Ni dispersion. In a 91h-lifetime test, this catalyst showed high stability at high temperature and weight hourly space velocity. This work demonstrates that the catalytic performance of the V-promoted Ni/Al₂O₃ catalysts can be improved by carefully controlling the preparation method/conditions.