基于LS-SVM棉针织物前处理工艺指标软测量

该文针对棉针织物前处理过程工艺指标吸水性和白度难以实现在线连续检测,且与前处理过程温度、时间、液碱浓度、双氧水浓度等影响因素具有较强非线性,难以建立精确数学模型。在分析了棉针织物前处理过程质量指标相关影响因素的基础上,采用最小二乘支持向量机建立了前处理过程工艺技术指标软测量模型,并通过实验验证了软测量模型的有效性。     

Alkaline treatment kinetics of calcium phosphate by piezoelectric quartz crystal impedance

Calcium phosphate film was prepared by electrochemical deposition technology. Subsequently, the alkaline treatment process of calcium phosphate film in 0.1 mol/L NaOH solution was monitored on real time by the piezoelectric quartz crystal impedance (PQCI) technique. The variations of morphology and composition for the alkaline treatment products were characterized by scanning electron microscopy (SEM), Fourier transform infrared (FT-IR) and X-ray diffraction (XRD), respectively. The dynamic variations of calcium phosphate can be characterized by the change of equivalent circuit parameters. The results show that the forming process of hydroxyapatite (HA) is composed of three stages: (1) acidic calcium phosphate dissolution; (2) phase transformation; and (3) HA formation. Furthermore, the correlative kinetic equations and parameters are obtained by fitting the static capacitance (C _s)—time curves. Foundation item: Project(2005CB623901) supported by the Major State Basic Research and Development Program of China     

低温碱性脂肪酶产生菌的筛选及产酶培养基的优化

以橄榄油为唯一碳源,从渤海湾盐碱地被油污染的土样中分离筛选出1株产低温碱性脂肪酶菌株34-5,初步酶学性质研究表明,该菌所产脂肪酶的最适温度为25℃,最适pH为9．6,该菌的16S rDNA基因序列与伯克霍尔德氏菌（Burkholderia）的同源性为99％摇瓶实验表明,该菌株最适产酶培养基为（g／L）;淀粉10,黄豆饼粉20,玉米浆20,K2HPO4 1,聚乙烯醇大豆油乳化液20．其最高酶活为6．87U／mL。     

产低温碱性脂肪酶菌株Acinetobacter johnsonii LP28的鉴定及发酵条件优化

从实验室保藏的49株碱性脂肪酶产生菌中筛选出产低温碱性脂肪酶菌株LP28,初步酶学性质研究表明,该脂肪酶的最适作用温度为30℃,最适作用pH为9．0,粗酶液在室温条件下处理48h仍具有93．78％的残余酶活．该菌经16SrDNA鉴定为约氏不动杆菌（Acinetobacter johnsonii）,同源性为99％．摇瓶实验表明,该菌株最适产酶培养基为（g/L）：淀粉10,牛肉膏20,K2HPO41,PvA-大豆油20．最高酶活为3．06U／mL．     

产高温碱性蛋白酶菌株筛选及酶学性质研究

从高温堆肥土样中筛选到一株高产蛋白酶的菌株,经鉴定为Bacillus subtilis,命名为I15.对最适产酶发酵条件进行了优化,并研究了发酵产蛋白酶的酶学性质.结果表明,玉米淀粉和豆饼粉是该菌发酵产蛋白酶的最适经济碳氮源;该蛋白酶属高温碱性蛋白酶,具有很强的热稳定性和酸碱稳定性.另外,突出的性质是该蛋白酶对表面活性剂和温和型去垢剂具有超强的耐受性,将具有广阔的市场前景.     

具有某种特性的向量优化问题的解的刻画

在有限维空间中,当目标函数凸下半连续时,向量优化问题一定有弱有效解,并且解集是紧的,但当目标函数非凸时,这不一定成立,文章讨论了把目标函数的凸性减弱之后,向量优化问题的解集是非空并且紧的,另外还得到一些等价的刻画。     

碱性蛋白酶水解豌豆蛋白的条件优化

采用碱性蛋白酶对豌豆蛋白进行水解,通过单因素试验,分析了温度、pH、酶与底物浓度比、底物浓度、水解时间对水解度影响,并在单因素试验的基础上,利用响应面分析法,优化确定的豌豆蛋白酶水解最佳条件为:温度54.5℃,pH7.9,酶与底物浓度比1.5%,底物浓度2.9%,水解时间3.0 h,最佳酶水解条件下的水解度为13.42%.     

碱性[Bmim]Im离子液体催化合成DEHC

研究了在1-丁基-3-甲基咪唑阳离子与咪唑阴离子搭配的碱性[Bmim]Im离子液体催化作用下,碳酸二甲酯(DMC)与异辛醇(EHOH)通过两步酯交换法制备碳酸二异辛酯(DEHC)的合成工艺.确定了合成DEHC的最佳反应条件为:催化剂用量为原料总质量的2.0%,醇酯摩尔比为4:1,一步反应温度90℃,反应时间2 h,二步...     

碱浸条件下杂质离子对锌电积的影响

针对贫杂铅锌矿碱浸工艺,系统地分析电解过程杂质离子CO3^2-、SO4^2-、SiO3^2-、F^-、CL^-、S2^-对电解金属锌粉的影响．实验结果表明：CO3^2-、SO4^2-、SiO3^2-、F^-离。子对电解金属锌粉没有明显影响,Cl^-离子浓度宜控制在20g／L以下基本上满足GB／T6890—2000国家标准的锌粉三级标准,S^2-离子对电解金属锌粉影响比较显著,即使在S^2-微量的条件下金属锌粉的品质下降了近5％．     

Methane absorption and application of mixed organic aggregate prepared from Span80 and alkaline salt

The water-based materials for mine gas absorption and explosion suppression were prepared, in which the mixed organic aggregate of Span80 and alkaline salt can be used as methane absorbent. Methane was used as a model of mine gas, and the absorptions of methane with different complex materials were studied using head space gas chromatography. Then the state of aqueous material was characterized with laser light scattering instrument and the effects of different complex materials on explosion suppression were preliminarily studied in explosion chamber which can simulate mine gas explosion. The research results showed that complex material could absorb methane and there was some correlation between the mean diameter of organic aggregate in aqueous material and the absorption effect. Additionally, the aqueous material could suppress the methane explosion to some degree. The material can absorb mine gas in atomization condition, therefore, degrease mine gas concentration and influence the distribution of mine gas in the space, and then suppress the mine gas explosion to some extent.