无菌病房卫生间设计及应用效果分析

介绍了该工程净化空调系统的组成、主要设计参数指标的优化选择和实验测试及数值模拟预测的结果.工程建成启用后采用多种检测方式对各项参数指标进行了跟踪检测及分析,系统运行良好,达到了预期的效果.     

Taurine is Involved in Energy Metabolism in Muscles,Adipose Tissue,and the Liver

Energy metabolism is a basic and general process, by which the body acquires and uses energy to maintain normal function, and taurine plays a vital role in energy metabolism. Taurine deficiency may cause a weak energy metabolism and energy metabolism dysfunction. Taurine biosynthetic ability is limited, and its supplementation in the diet can strengthen energy metabolism in muscle performance, cardiac function, liver activity, and adipose tissue. Combining taurine with other drugs may have a superior effect in energy metabolism. In many metabolic disorders, taurine, or the combination of taurine with other drugs, also functions as a repair treatment for damaged tissues, and acts as a promoter for the balance of energy metabolism. The present study discusses the potential roles of taurine in energy metabolism.     

Photo‐Induced Hydrogel Formation Based on g‐C3N4 Nanosheets with Self‐Cross‐Linked 3D Framework for UV Protection Application

Composite hydrogels of graphitic carbon nitride nanosheets (CNNS) and polyacrylamide (PAM) with superior UV absorption and visible transparence capabilities are reported. CNNS is employed not only as a photocatalytic initiator to trigger the polymerization of acrylamide, but also as a cross‐linker to 3D connected PAM chains via hydrogen bonds. The obtained CNNS/PAM hydrogels are highly moldable for preparing various forms, and have good mechanical properties, self‐healing ability, and photo‐stability. Furthermore, the composite hydrogels have a wide spectral range for UV absorption compared to conventional UV protective materials. Besides the complete screening of UVB (280–315 nm) in sun radiation, the CNNS/PAM hydrogel film can also filter >95% UVA radiation (315–400 nm) by regulating the coating thickness, meanwhile retaining a high visible transmittance. Therefore, the CNNS/PAM hydrogels have potential applications for shielding UV radiation. Additionally, this strategy provides a common and facile route to fabricate functional composite hydrogels via photo‐induced polymerization.     

IEEE802.11i协议密钥协商机制的分析与改进

通过分析无线局域网的安全协议,发现密钥协商机制——四次握手协议在第一次握手时未对消息进行任何处理,导致该协议存在拒绝服务攻击的安全隐患,就此提出加密管理帧的方法来消除该安全隐患,并对该方法加以论证。     

基于YOLOv3与ResNet50算法的智能垃圾分类系统

垃圾分类对于我们日常生活来说意义重大,它不仅体现的是环境问题,更是资源的节约和绿色的生活方式,更加代表和体现了社会的文明水平,我国各地近些年也相继推行了垃圾分类的政策.2020年,新冠疫情席卷全球,对我们的日常生活造成了非常大的冲击,病毒与细菌的感染不只是通过呼吸,而且可以通过间接的接触来传染,这就要求了我们在生活中应该尽量避免去接触公共的设施和物品,而垃圾回收点恰恰是人员来往较多,很容易造成接触感染.对此,设计了一种疫情之下的垃圾智能分类与识别系统.设计的总体思想是采用Arm公司的EAIDK-310开发板,同时配备罗技C270摄像头采集装置对实际生活中的常见垃圾进行识别与分类,然后通过摄像头采集装置采集到垃圾的图像,结合深度学习模型自动检测、识别垃圾的类别,从而可以根据类别直接进行垃圾的分类丢弃.模型是基于YOLOv3在复杂环境下垃圾检测的基础上完成,构建ResNet50网络,对垃圾的类别进行训练并识别.通过该智能垃圾分类系统,可以提高投放垃圾效率,大大减少人员在垃圾站附近的聚集并做到无接触的垃圾丢弃,从而能够有效避免因为接触而造成的交叉感染的风险,符合当下疫情期间的社会需求.     

Photocatalytic oxidation for antimicrobial control in built environment: A brief literature overview

This paper presents a literature review of the status of research on indoor antimicrobial control by photocatalytic oxidation (PCO). The review and discussion concentrate on (a) the PCO disinfection mechanisms; (b) different kinetic experiments and models; (c) the dependence of inactivation rate on some key influencing factors; (d) an overview of various PCO reactors and their application performance reported in the literature. Major conclusions of the overview and recommendations for future work include (a) several reaction pathways of PCO antimicrobial process were reported, but the decomposition of cell after inactivation needs to be fully understood; (b) kinetic experiments were carried out to determine the dependence of antimicrobial reaction rate on some influencing factors. However, the results from different researchers were not comparable to each other, due to differences of reaction parameters and the empirical models used; (c) various types of reactors were adopted to determine the efficiency of PCO on the rate of biological aerosol removal from air flow. There is a need to develop an empirical model for PCO reactor combining the particle dynamics and photocatalytic oxidation for bioaerosols; (d) there is a need to develop more stable and reliable photocatalysts, and further develop performance assessment protocol in both laboratory and the field.     

Development of a bienzyme system based on sugar–lectin biospecific interactions for amperometric determination of phenols and aromatic amines

Bienzyme electrode with horseradish peroxidase (HRP) and glucose oxidase (GOD) multilayers was constructed based on sugar–lectin biospecific interactions for amperometric determination of phenolic compounds and aromatic amines. Atomic force microscopy (AFM) was applied to monitor the uniform layer-by-layer assembly of concanavalin A (Con A) and HRP or GOD on polyelectrolyte precursor film-modified Au electrode. Substituted phenolic compounds and aromatic amines could be determined with in situ generation of H₂O₂ by GOD-catalyzed oxidation of glucose. The parameters of the biosensor including the number of assembled HRP and GOD layer, and the concentrations of glucose were optimized. The linear range for the determination of catechol and p-phenyldiamine was 6.0–60.0 μmol L⁻¹ and 7.6–68.4 μmol L⁻¹ with detection limit of 0.9 μmol L⁻¹ and 0.4 μmol L⁻¹, respectively. The biosensor possessed high sensitivity and fast response for phenolic compounds and 95% of the maximum response could be reached in about 3 s. Glucose, ascorbic acid, tartaric acid, citric acid and starch exhibited no interference for the detection. The biosensor presented high stability due to the design for in situ generation of H₂O₂ with bienzyme system.     

三值钟控绝热静态随机存储器设计

通过对多值逻辑、绝热电路和三值SRAM结构的研究,提出一种新颖的三值钟控绝热静态随机存储器(SRAM)的设计方案。该方案利用NMOS管的自举效应,以绝热方式对SRAM的行列地址译码器、存储单元、敏感放大器等进行充放电,有效恢复储存在字线、位线、行列地址译码器等大开关电容上的电荷,实现三值信号的读出写入和能量回收。PSPICE模拟结果表明,所设计的三值钟控绝热SRAM具有正确的逻辑功能和低功耗特性,在相同的参数和输入信号情况下,与三值常规SRAM相比,节约功耗达68%。     

SO3H-functionalized mesoporous carbon/silica composite with a spherical morphology and its excellent catalytic performance for biodiesel production

Mesoporous carbon/silica composites functionalized with –SO₃H groups were prepared via polymerization and carbonization of glucose into mesoporous silica SBA-15 and a followed sulfonation by sulphuric acid. These composites were characterized by powder X-ray diffraction, N₂ adsorption–desorption and transmission electron microscopy, which suggested the preservation of ordered mesoporous structure, as well as a novel spherical morphology. The result of fourier transform infrared spectroscopy indicated the successful modification of –SO₃H groups and the acidity of catalysts was determined by an indirect titration method. The composite with 40 % carbon loading possessing the highest acidity in synthesized catalysts and the ordered mesoporous structure without pore blocking exhibited a remarkable catalytic activity for biodiesel production. Experimental parameters including the carbon loading, molar ratio of reactants, reaction time and reaction temperature were optimized. In addition, a superior recycling property was exhibited after five consecutive cycles.