不同分散剂对水系流延氧化铝基片的影响

研究了2种不同类型的分散剂对水系流延氧化铝基片的影响。研究发现：从浆料的分散性、所流延坯片的质量、烧结后基片的密度及其微观结构的比较，流延氧化铝浆料以聚丙烯酸（PAA）为分散剂明显优于以阿拉伯树胶为分散剂。以阿拉伯树胶为分散剂的浆料分散性较差，流延出的坯片生坯密度较低、坯片的柔软性较差，烧结后相对密度较低，同时，由于分散剂对塑化剂的影响，使得粘结剂PVA在浆料中没有凝胶化，从而在坯片上表面产生C富集层。     

两性田菁胶在处理高浓度印染废水中的应用

研究了以聚合硫酸铁(PFS)为主凝剂、两性田菁胶(ASG)为助凝剂处理高浓度印染废水的各种影响因素。实验结果表明：PFS和ASG分别以2000mg／L和100mg／L的复配浓度、pH值接近中性时混凝效果为最佳，CODCr去除率达到80％，色度与浊度去除率均达99％以上。     

脱胶工艺对不同段棉秆皮纤维性能的影响

定量测定棉秆皮各段成分含量,并采用化学二煮法脱胶方法对棉秆皮进行分段脱胶.以棉秆皮纤维细度、残胶率、断裂强度为指标,研究脱胶处理对提取的不同段棉秆皮纤维性能的影响.结果表明,在同一脱胶工艺条件下,不同段棉杆皮纤维的细度、残胶率、断裂强度有较大差异,棉秆皮应采用分段脱胶处理.合理的棉秆皮脱胶分段方案为：第一段根部,地表以下部分;第二段中段,地表以上长度25cm;第三段稍部,地表以上长度大于25cm.     

Drift and retention of pelagic spawning minnow eggs in a regulated river

Long‐distance drift of eggs and larvae has been identified as a possible cause of downstream displacement and poor recruitment of the endangered Rio Grande silvery minnow (Hybognathus amarus; silvery minnow). Seven experiments were conducted using artificial eggs to estimate silvery minnow egg drift and retention in the Albuquerque and Isleta reaches of the regulated Middle Rio Grande, New Mexico, USA over a range of flows during expected spawning times. Bead retention varied by reach, discharge, and shape of the hydrograph. Highest retention (6.9 and 9.7% per km in the Albuquerque and Isleta reaches, respectively) occurred on the ascending limb of a high flow in areas where there was substantial floodplain inundation. Retention was maximized at different flows in each reach (97 and 140 m³/s, respectively), possibly associated with reach‐specific floodplain inundation thresholds. Lowest retention in each reach (2.1 and 1.7%, respectively) occurred on the descending limb of low and high flows, respectively. Of the silvery minnow eggs produced in the combined Albuquerque and Isleta reaches in 2005, 8–14% are predicted to have been retained in the Albuquerque Reach (67 km) and 49–83% in the Isleta Reach (86 km) based on the distribution of adult fish and measured bead retention rates. Although silvery minnow propagules are capable of drifting long distances, our study suggests that considerable retention occurs in the Middle Rio Grande. Habitat restoration to increase channel habitat complexity, and flow management to promote floodplain inundation should help to retain a greater proportion of propagules in upstream reaches. Copyright © 2010 John Wiley & Sons, Ltd.     

Biodegradable blend films based on two polysaccharide derivatives and their use as ibuprofen‐releasing matrices

Differential scanning calorimetry (DSC), FTIR, X‐ray diffraction (XRD), and viscosity methods were used to examine the miscibility, interaction, and degradability of cationic guar gum (GG) and sodium carboxymethylcellulose (NaCMC) in their blend films. The experiment results prove that there exist electrostatic interactions and hydrogen bonding between GG and NaCMC. Blend films degrade quicker than pure GG or NaCMC film. Furthermore, the degradation rate of blend films is related to the interactions between GG and NaCMC. Based on the research of blend films as the drug carriers for Ibuprofen, it is found that the blend composition, initial drug concentration, and pH value affect the drug release and the GG/NaCMC blend films have good sustained release performance. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 103: 3553–3559, 2007     

草莓原果果冻的研制

采用草莓原果果浆制作果冻。目的是控制食品添加剂使用量，降低果冻弹性，避免因吸食果冻而造成的风险。同时由于果浆的应用，赋予产品丰富的营养。     

玉米变性淀粉压裂液稠化剂的研制

对玉米淀粉经化学和物理变性制得变性淀粉。将该变性淀粉与少量植物胶XDF复配制成压裂液稠化剂。并对该稠化剂的理化性能、用量、复配比例以及压裂液的配方、性能和影响凝胶的因素进行了研究。结果表明:用该稠化剂配成的压裂液粘度高、流变性好、摩擦阻力小、易破胶、低残渣、低伤害,是一种适用于80℃以下低温的优良压裂液。     

野油菜黄单孢菌的诱变育种及发酵培养基的确定

利用紫外线和氯化锂对野油菜黄单孢菌进行诱变,从诱变菌株中筛选出了1株具有较高粘度和产胶率的菌株ZG 1.同时,利用此菌株通过正交试验,确定了发酵培养基配方:淀粉2%,蔗糖2%,蛋白胨0 3%,豆饼粉0 2%,CaCO3,0 3%,柠檬酸0 1%.试验结果表明:菌株的最终发酵液粘度和产胶率由初始的4 5Pa·s和1 99%提高到12 28Pa·s和3 45%.     

杜仲胶/天然橡胶并用硫化胶的力学性能

采用常规硫化方法,将杜仲胶(EUG)与天然橡胶(NR)共混硫化,研究不同EUG含量对并用硫化胶的力学性能、应力软化效应及动态力学性能的影响;并通过差示扫描量热法(DSC)对内部结晶进行表征,通过扫描电子显微镜(SEM)对硫化胶拉伸断面进行观察。实验结果表明,加入EUG使得并用硫化胶的断裂伸长率和拉伸强度都有所下降、应力和应变也逐渐降低;100%定伸应力和300%定伸应力增加;应力软化现象提高;玻璃化转变温度(T_g)向低温移动,储能模量降低。通过SEM的观察和DSC测试可知硫化胶内部含有部分结晶。     

The depression behavior and mechanism of tragacanth gum on chalcopyrite during Cu-Mo flotation separation

In this work, tragacanth gum (TG), a nontoxic and environmental friendly organic polymer, was used to replace the traditional inorganic depressants of chalcopyrite during the flotation separation of copper-molybdenum sulfides. The single mineral flotation and artificial mixed minerals flotation experiments were conducted to investigate the effect of TG on flotation separation behaviour of molybdenite and chalcopyrite. The TG’s adsorption mechanism on molybdenite and chalcopyrite was investigated by X-ray photoelectron spectroscopy (XPS) and Time-of-flight secondary ion mass spectrometry (ToF-SIMS). The flotation experiment results showed that at pH 3–8, TG had a significant selective depressive effect on chalcopyrite flotation and it was enhanced with increasing TG concentration, but hardly affected the molybdenite flotation. XPS analysis showed that TG was chemically adsorbed on both molybdenite and chalcopyrite surfaces and ToF-SIMS results demonstrated that the interaction of TG and chalcopyrite was stronger than that of TG and molybdenite. Further, XPS narrow scanning analysis suggested that TG might chemisorb onto chalcopyrite via chemical bond between the carboxyl groups and Fe sites on bulk chalcopyrite surface as well as the hydrogen bond between the hydroxyl groups and surface Fe oxides/hydroxides. The strong TG adsorption on chalcopyrite hindered the subsequent adsorption of PBX on chalcopyrite surface, thus chalcopyrite was significantly depressed and Cu-Mo flotation separation was achieved.