水包砂多彩涂料的制备及应用

介绍了水包砂多彩涂料的制备工艺流程，对保护胶的用量和种类、纤维素醚用量和种类、不同类型的乳液、防沉剂的种类进行平行实验。实验结果表明：选用 S482为保护胶，涂料的耐水白性和稳定性好；分散相中疏水改性纤维素醚 HE-10K用量为 0.4%~0.6%、250HBR用量为 0.2%~ 0.6%，连续相中 4% S-482保护胶溶液用量为 25%、HY-1黄原胶用量为 0.025%、TX-100乳液用量为 3%~5%、RS-3799乳液用量为 12%~15%时，所制的水包砂多彩涂料具有强度适中、抗渗色性强、耐水白性好、贮存稳定性好的特点。     

Risk management for hydrogen networks across refineries

Stricter environmental regulations and policies are leading to increasing requirements for the quality of the oil product. Hydrogen fluctuation in the hydrofining process of refineries remains a considerable problem that may affect the quality of refinery products and increase operating costs. As hydrogen supply across multiple refineries is common in the process industry, the optimal design of interplant hydrogen networks (multi-refinery hydrogen networks) is inevitable in improving the stability of hydrogen supply and reducing the utility consumption of the entire system. This paper introduces the Worst-Case Conditional Value at Risk (WCVaR) concept for the synthesis of the interplant hydrogen network system with hydrogen source flowrate fluctuations. WCVaR is adopted to indicate the expected value of the pure hydrogen content in hydrogen networks in the worst case. Considering the adjustability of hydrogen utility in the realistic production process, this paper studies the stability of interplant hydrogen networks under constant and adjustable hydrogen utilities. The Monte Carlo simulation verifies that the multi-refinery hydrogen network structures obtained by this method are more robust.     

Ultrasonic Cavitation-Assisted and Acid-Activated Transcytosis of Liposomes for Universal Active Tumor Penetration

Active tumor penetration has been recently recognized as a promising strategy to resolve the limitation of nanomedicine in terms of tumor penetration, but it is challenging to develop active transporting nanocarriers. Here, an ultrasonic cavitation-assisted and acid-activatable active transporting liposome for a broad range of tumors is reported. The active transporting liposome (size and charge dual-conversional gemcitabine prodrug-integrated liposomal nanodroplet (SCGLN)) overcomes the tight blood vessel walls with the aid of ultrasonic cavitation. The SCGLN subsequently transforms from micro-size to nano-size under prolonged ultrasound radiation. Once in the acidic tumor microenvironment, the nanosized SCGLN undergoes negative-to-positive charge-reversal and triggers the cationization-initiated transcytosis to penetrate deep into tumor parenchyma. The gemcitabine-loaded SCGLN exhibits potent antitumor activity in multiple poorly permeable tumor models, which completely erases subcutaneous U251 glioma and stops the progression of orthotopic BxPC3 pancreatic ductal adenocarcinoma. This study presents a promising and universal strategy to develop active penetrating nanomedicines for efficient drug delivery in the low permeable tumor.     

火灾下防火装饰一体化钢梁抗火性能研究

为研究采用防火装饰一体化构造的钢梁在火灾下的温度场和承载力,通过基于ANSYS 软件建立的分析模型对不同截面尺寸和不同耐火极限的钢梁进行抗火性能研究,并给出了计算钢梁承载力的简化公式,公式计算结果与有限元结果吻合情况较好。     

Electrochemical impedance spectroscopy for analytical determination of paraquat in meconium samples using an immunosensor modified with fullerene, ferrocene and ionic liquid

The paper reports a highly sensitive electrochemical immunosensor for the detection of paraquat. The immunosensor bases on glassy carbon electrode modified with a composite made from fullerene, ferrocene and the ionic liquid. The components were immobilized on the electrode surface by chitosan. The antibody of paraquat was covalently conjugated to the surface which was then blocked with bovine serum albumin. Analytical characteristics of the immunosensor were investigated by electrochemical impedance spectroscopy. It offers good repeatability (RSD = 1.5%), a stability of more than 150 days, an impedimetric response to paraquat in the range from 3.89 × 10⁻¹¹ to 4.0 × 10⁻⁸ mol L⁻¹, and a detection limit (S/N = 3) of 9.0 × 10⁻¹² mol L⁻¹. The effects of omitting fullerene and the ionic liquid were well tested. The results indicated that sensitivity of the immunosensor is 3.7-fold better if fullerene and ionic liquid are used. This demonstrates that fullerene facilitates electron transfer on surface of the electrode due to unique electrochemical properties, while the ionic liquid provides biocompatible microenvironment for the antibody, which results in the enhanced sensitivity and stability. Moreover, surface morphology feature and electrochemical properties of the electrode were also examined. The method was satisfactorily applied to the determination of paraquat in meconium.     

集散控制系统通用性输入通道的设计与研究

设计了通用性模拟量输入通道,描述了集散控制系统实现热电阻、热电偶、电流、电压和频率信号的“万能”模拟量输入通道的设计方法与原理.结果表明,新型通用性模块增加了DCS系统的可组态性与实用性,降低了用户生产与维护的成本.     

输电线路耐张线夹的数字射线检测

耐张线夹的压接质量直接关系输电线路的安全。通过设计相应检测工装、改良检测设备等措施,成功利用数字射线(DR)技术,对耐张线夹的压接质量进行了检测,既满足了相关标准的要求,又提高了检测效率,为输电线路的安全提供了保障。     

SA分子量及用量对SA/PNIPAAm semi-IPN水凝胶溶胀性能的影响

研究了海藻酸钠(SA)的分子量及用量对SA/聚(N-异丙基丙烯酰胺)半互穿网络(SA/PNIPAAm semi-IPN)水凝胶的平衡溶胀度、溶胀速率和消溶胀速率的影响。结果发现,水凝胶平衡溶胀度随着凝胶网络中SA组分分子量以及用量的增加而增大;在pH=1.0条件下,SA/PNIPAAm semi-IPN水凝胶的溶胀速率随着SA的分子量以及用量的增加而降低,在pH=7.4条件下,水凝胶的溶胀速率随着SA的分子量以及用量的增加而增大;SA用量较低时,分子量的大小对SA/PNIPAAm semi-IPN水凝胶的消溶胀速率有很大影响,随着SA用量的增加,分子量大小对水凝胶消溶胀速率的影响作用降低。     

不热处理树脂摩擦材料的试验研究

用HRJ 15113快速固化的酚醛树脂制成了热压盘式刹车片样品(热压后未热处理),试验研究了该摩擦材料的摩擦性能和物理性能.结果表明,其摩擦磨损性能、剪切强度以及与普通树脂样品和日本原装件样品的试验台比较试验结果,都非常好.     

镁系酸吸收剂对氯化聚乙烯橡胶性能的影响

研究了镁系酸吸收剂在CM过氧化物与TCHC硫化体系中的作用。结果表明，在过氧化物体系中，硫化胶初始物理性能及耐热老化性能随MgO活性降低而降低，且都优于超细Mg（OH）2；而在Eata Mix TCHC硫化体系中，MgO活性对物理性能的影响很小，超细Mg（OH）2做酸吸收剂与高活性MgO相当，完全可代替昂贵的高活性MgO以降低制造成本。