聚甲基丙烯酸甲酯／镉黄颜料色母粒的合成及其研究

采用亚硫酸氢钠、过氧化二苯甲酰作引发剂,在无机镉黄颜料水悬浮液中,引发甲基丙烯酸甲酯进行聚合反应,得到了镉黄颜料色母粒。对该种色母粒作了红外光谱及DTA、TG分析,并探讨了其反应机理。     

Importance of biotic interactions in large rivers: an experiment with planktivorous fish,dreissenid mussels and zooplankton in the St. Lawrence River

Physical conditions are usually considered pre‐eminent in controlling river plankton, but biotic interactions may be important in slackwater areas. To begin testing this general hypothesis, we conducted a 12‐day, predator–prey experiment in 3500 litre mesh enclosures in a slackwater area of the St. Lawrence River using planktivorous, juvenile yellow perch (Perca flavescens) and Dreissena mussels. Results generally supported our hypotheses that: (1) perch would directly suppress large zooplankton via predation but benefit microzooplankton through indirect interactions; and (2) dreissenids would directly depress rotifer densities via predation and have indirect negative effects on macrozooplankton. Based on gut contents of experimental fish, cladocera were the principal prey of smaller yellow perch (c. 46–50 mm), followed by copepods, ostracods, and rotifers. Larger juvenile perch (c. 67–73 mm) fed almost exclusively on copepods and ostracods. Densities of calanoid copepodids, nauplii, and some cyclopoid copepods (Diacyclops thomasi) were significantly depressed by perch, and adult Eurytemora affinis (99% of adult calanoids) essentially disappeared from fish enclosures. Despite being a favourite prey item of small perch, densities of the small cladoceran Bosmina (Sinobosmina) spp. were significantly higher when fish were present (150% greater than control densities on Day 12). Densities of the very abundant rotifer Polyarthra were >300% greater in fish enclosures than controls by Day 12, and the rotifers Synchaeta and predaceous Ploesoma were significantly more abundant in the presence of perch. Increases in rotifers and cladocera suggest indirect, positive effects of fish related to significantly higher phytoplankton biomass or decreased densities of predaceous copepods. Densities of eight of ten zooplankton groups examined declined significantly when mussels were present, and calanoid copepodids also declined but not significantly. Chlorophyll‐a concentrations were slightly lower in mussel enclosures. This evidence suggests biotic interactions play important roles among potamoplankton in slackwater habitats, but river‐wide implications of these findings require further study. Copyright © 2003 John Wiley & Sons, Ltd.     

溶液丁苯胶黄变原因的研究

溶液丁苯胶在生产的过程中,聚合胶液或成品胶块经常发生黄变,影响产品质量,本文结合茂名乙烯生产装置的实际情况,对引起黄变原因的物质和机理进行了研究,并采取了有效措施,解决了黄变问题.     

望奎黄色秸秆采用直燃技术发电工程设计浅谈

介绍秸秆电厂的主要设计原则和方案,论述总平面布置以及建筑结构的型式,并对锅炉的燃烧系统、烟风系统、上料系统、输送、破碎及给料设备进行详细论述,介绍了燃料的来源及主要技术经济指标。     

中性亮黄3GL合成研究

本文简要叙述由间二氨基苯磺酸、苯胺等为原料分别与三聚氯氰缩合，缩合物经重氮后与邻氯苯基吡唑融偶合合成染料中性亮黄3GL的工艺过程。     

氧化铝厂赤泥制备H2S吸附剂的试验与应用

介绍以广西平果铝业公司氧化铝厂赤泥为主要原料制备硫化氢气体吸附剂的工艺及吸附性能.结果表明吸附剂最佳配方为赤泥80%～85%,助剂15%～20%,辅以赤泥附液为润滑剂;焙烧活化的最佳温度为300～350℃;吸附温度在20～60℃,吸附剂的穿透硫容最大为19.3%.利用该吸附剂净化黄磷生产尾气工业试验,取得了比较理想的结果.     

海河流域:张家口城市空间营造

该文是个案研究系列之海河流域张家口城市空间营造研究,对张家口城市族群的更替叠累及城市空间营造进行了分析研究。     

Ionic liquid based periodic mesoporous organosilica: An efficient support for removal of sunset yellow from aqueous solutions under ultrasonic conditions

The efficiency of an ionic liquid based periodic mesoporous organosilica (PMO-IL) in the removal of sunset yellow from aqueous solutions using ultrasonic assisted adsorption method was investigated. The PMO-IL was first characterized by nitrogen sorption and TEM techniques. The optimized conditions (0.013 g of adsorbent, 32 mg L⁻¹ of sunset yellow at 2 min of sonication time and pH 7) were obtained by central composite design (CCD). Fitting the equilibrium data show the suitability of the Langmuir model with second-order equation to control the kinetic of the adsorption process and good reusability (5 cycles) of PMO-IL for adsorption of dye.     

Artificial neural network – Imperialist competitive algorithm based optimization for removal of sunset yellow using Zn(OH)2 nanoparticles-activated carbon

The effects of variables were modeled using multiple linear regressions (MLR) and artificial neural network (ANN) and the variables were optimized by imperialist competitive algorithm (ICA). Comparison of the results obtained using introduced models indicated the ANN model is better than the MLR model for the prediction of sunset yellow removal using zinc oxide nanoparticles-activated carbon. The coefficient of determination (R²) and mean squared error (MSE) for the optimal ANN model with 9 neurons at hidden layer were obtained to be 0.9782 and 0.0013, respectively. A nano-scale adsorbents namely as Zn(OH)₂ was synthesized and subsequently loaded with AC. Then, this new material efficiently applied for sunset yellow (SY) removal, from aqueous solutions in batch process. Firstly the adsorbent were characterized and identified by XRD, FESEM and BET. Unique properties such as high surface area (>1308 m²/g) and low pore size (<20 Å) and average particle size lower than 45.8 Å in addition to intrinsic properties of nano-scale material high surface reactive atom and the presence of various functional groups make it possible for efficient removal of (SY). The effects of adsorbent dose, pH, initial SY concentration and contact time were optimized. Fitting the experimental data of adsorption over time in the range of 30 min to various models show the suitability of second-order and intraparticle diffusion models for the prediction of removal rate and their parameters (R² > 0.999). The factors controlling adsorption process were also calculated and discussed. Equilibrium data fitted well with the Langmuir model at all amount of adsorbent with maximum adsorption capacity of 158.7 mg g⁻¹.     

Two New Quinochalcone C-Glycosides from the Florets of Carthamus tinctorius

Two new quinochalcone C-glycosides, named hydroxysafflor yellow B (1) and hydroxysafflor yellow C (2), along with two known quinochalcone C-glycosides, safflomin C (3) and saffloquinoside C (4), and one known flavanone, (2R)-4'',5-dihydroxyl-6,7-di-O-β-d-glucopyranosyl flavanone (5), were isolated from the florets of Carthamus tinctorius. Their structures were determined by extensive spectroscopic (UV, IR, HR-ESI-MS, 1D and 2D NMR) analyses. In addition, these quinochalcone C-glycosides together with hydroxysafflor yellow A and anhydrosafflor yellow B were evaluated for their anti-oxidative effects against H₂O₂-induced cytotoxicity in cultured H9c2 cells. Among them, compound 2 exhibited significant anti-oxidative effects.