某低品位铜钼矿低碱度浮选工艺研究

针对某低品位斑岩铜钼矿矿样进行了低碱度浮选工艺研究。铜钼混合浮选阶段采用高效组合抑制剂CS,在低碱度（pH=7~8）条件下实现了铜、硫分离,伴生金属钼取得了较高的回收率;铜钼分离浮选阶段采用新型抑制剂BK510替代Na₂S抑制含量较高的次生铜,在低碱度（pH=8~9）条件下取得了较好的铜钼分离效果。实验室闭路试验获得了钼品位46.21%,钼回收率84.01%的钼精矿和铜品位24.61%,铜回收率89.25%的铜精矿。     

水溶性有机去膜液的主要成分及其作用原理概述

文章在大量的文献基础上总结了水溶性有机去膜液的主要成分,包括有机胺、有机溶剂、加速剂、缓蚀剂和消泡剂,并介绍了各种成分在去膜过程中的作用原理。重点介绍应用于去膜液中的各类缓蚀剂及其缓蚀机理,缓蚀剂包括含氮化合物、含硫化合物、有机酸、芳香族羟基化合物等。     

气相防锈无纺布

介绍了新一代气相缓蚀剂包装材料气相防锈无纺布的特点及其应用的研究。     

An On-Site Cooling Tower Treated by Stand-Alone Low-Concentration Dissolved Ozone

We report on an on-site 500 RT cooling tower ozone treatment process, in which chemicals other than ozone itself were completely eliminated. Ozone in an amount leading to less than 0.1 ppm of dissolved ozone was continuously introduced via side-stream injection into the circulating water returning from the chiller. The ozonated water was initially made to flow from the distributor to the filler in order to eliminate the growth of algae, and then to the chiller to reduce the corrosion and the fouling in the water. Positive ions such as Ca⁺² and Mg⁺² in the circulating water were precipitated by chelating them with carboxylic acids formed by the oxidation of organic compounds. We observed that using an ozone dosage of 0.1 ppm resulted in a colony-forming unit (CFU) less than 2 × 10³ /mL. With that well-controlled CFU, corrosion controlling and scale reducing were achieved as well.     

Zn(H2PO4)2-N[CH2CH2OPO(OH)2]3对碳钢的协同效应与缓蚀机理研究

采用失重法、表面观察法、极化曲线法、氩离子刻蚀法和ＸＰＳ分析法研究Ｚｎ（Ｈ２ＰＯ４）２－Ｎ「ＣＨ２ＣＨ２ＯＰＯ（ＯＨ）２」３在海水中对碳钢的协同效应与缓蚀机理。结果发现：５０％Ｚｎ（Ｈ２ＰＯ４）２＋５０＾Ｎ「（ＣＨ２ＣＨ２ＯＰＯ（ＯＨ）２」３（ＸＭ－３０３在海水中对碳钢具有明显的协同缓蚀效应。５０％Ｚｎ（Ｈ２ＰＯ４）２＋５０％Ｎ「ＣＨ２ＣＨ２ＯＰＯ（ＯＨ）２」３（ＸＭ－３０３）主要为阴极抑制型缓蚀     

γ共辐射接枝丙烯酸改善聚醚砜粉体亲水性的研究

利用γ射线共照射技术在聚醚砜（Polyethersulfone,PES）粉体上按枝了丙烯酸。研究了丙烯酸单体体积分数、接枝溶液pH值、吸收剂量、阻聚剂（Cu^2＋）浓度等对接枝率的影响规律。通过与称重法相结合,得到了利用红外光谱对接枝率进行定量分析的工作曲线。研究结果表明,当吸收剂量为25kGy、单体体积分数为30％、阻聚剂用量为0．004mol／L时,可以获得最高的接枝率。接枝溶液中盐酸的添加有利于提高接枝率。提高接枝率有助于改善PES的亲水性。     

Novel peptides derived from egg white protein inhibiting alpha-glucosidase

The aim of this study was to search and identify potential anti-diabetic peptides with α-glucosidase and α-amylase inhibitory activities. After the Alcalase hydrolysis, egg white protein hydrolysates were purified and identified by LC–MS–MS. Eight identified peptides were further synthesized by the Fmoc solid-phase synthesis. The anti-diabetic activities of these synthetic peptides were assessed using enzymatic inhibitory assays against the α-glucosidase and α-amylase. Among the eight peptides, peptide RVPSLM was discovered as a potential α-glucosidase inhibitor with an IC₅₀ value at 23.07 μmol L⁻¹. However, it did not exhibit a visible or detectable inhibitory efficiency on the α-amylase. These studies indicate the potential of using egg white protein hydrolysates as a functional food product with the anti-diabetic activity.     

Capped inhibitor-loaded halloysite nanoclay-based self-healing silica coatings for corrosion protection of mild steel

The effect of polymeric nanocapsule capping in benzotriazole encapsulated into halloysite nanoclay (HNTs) dispersed into hybrid silica coatings was investigated for corrosion protection of mild steel. Optimization of the amount of inhibitor-loaded halloysite nanotubes with and without capping in the coating sol was carried out. The prepared formulations were dip-coated on mild steel substrates using dip-coater and then cured at 130 °C for 1 h. Surface morphology and elemental analysis of the nanoclay were studied using scanning electron microscopy and energy dispersive X-ray spectroscopy. X-ray diffraction and Fourier Transform Infrared spectroscopy analyses were carried out to confirm the encapsulation and capping of the halloysite nanoclay. The anti-corrosion and autonomic-healing properties of bare and coated substrates in 3.5 wt% NaCl solution were studied using electrochemical impedance spectroscopy, potentiodynamic polarization measurements and scanning vibrating electrode technique for varying exposure times. The coatings generated from the capped inhibitor-loaded HNTs dispersed sol-gel matrix was seen to provide higher corrosion resistance when compared to uncapped HNT based silica coatings. Electrochemical studies carried out for capped inhibitor-loaded HNT based coatings have shown an increase in charge transfer resistance to 10⁸ Ω cm² from 10⁶ Ω cm² of uncapped inhibitor-loaded HNT based coatings.     

A Potent,Selective CBX2 Chromodomain Ligand and Its Cellular Activity During Prostate Cancer Neuroendocrine Differentiation

Polycomb group (PcG) proteins are epigenetic regulators that facilitate both embryonic development and cancer progression. PcG proteins form Polycomb repressive complexes 1 and 2 (PRC1 and PRC2). PRC2 trimethylates histone H3 lysine 27 (H3K27me3), a histone mark recognized by the N-terminal chromodomain (ChD) of the CBX subunit of canonical PRC1. There are five PcG CBX paralogs in humans. CBX2 in particular is upregulated in a variety of cancers, particularly in advanced prostate cancers. Using CBX2 inhibitors to understand and target CBX2 in prostate cancer is highly desirable; however, high structural similarity among the CBX ChDs has been challenging for developing selective CBX ChD inhibitors. Here, we utilize selections of focused DNA encoded libraries (DELs) for the discovery of a selective CBX2 chromodomain probe, SW2_152F. SW2_152F binds to CBX2 ChD with a K_d of 80 nM and displays 24-1000-fold selectivity for CBX2 ChD over other CBX paralogs in vitro. SW2_152F is cell permeable, selectively inhibits CBX2 chromatin binding in cells, and blocks neuroendocrine differentiation of prostate cancer cell lines in response to androgen deprivation.     

Entwicklung und Validierung eines Kühlmittelsensors zur Bewertung der Korrosionsschutzwirkung

A sophisticated thermal management is one of the main subsystems that enables combustion engines with high power density. In this context the demands on coolants are also increasing. There has to be a certain level of corrosion protection to ensure the functionality of the cooling system. Hereafter the result of an electrochemical sensor development is presented. With the knowledge of analytical and electrochemical results a quick test for characterizing coolants corrosion protection has been developed and validated.