Removal of Phosphate from Aqueous Solution with Modified Bentonite

Bentonite combined with sawdust and other metallic compounds was used to remove phosphate from aqueous solutions in this study. The adsorption characteristics of phosphate on the modified bentonite were investigated, including the effects of temperature, adsorbent dosage, initial concentration of phosphate and pH on removal of phosphate by conducting a series of batch adsorption experiments. The results showed that 98% removal rate of phosphate was obtained since sawdust and bentonite used in this investigation were abundantly and locally available. It is concluded that modified bentonite is a relatively efficient, low cost and easily available adsorbent for the removal of phosphate from aqueous solutions.     

微量润滑系统参数对加工残余应力影响试验

微量润滑(MQL)切削是一种绿色加工技术。为了解MQL系统对加工残余应力影响,通过45钢车削正交试验,研究MQL系统的空气压力、润滑液用量、喷射距离、油雾温度对加工残余应力的影响。试验结果表明:油雾温度对加工残余应力的影响最大,润滑液用量也有一定的影响,空气压力和喷射距离的影响不显著;油雾温度降低,残余(拉)应力变小;润滑液用量增加,残余(拉)应力变小;MQL系统对加工残余应力的影响机制是通过改变油雾的冷却能力和渗透性,改变残余应力热力耦中的热效应。     

Initialization enhancer for non-negative matrix factorization

Non-negative matrix factorization (NMF), proposed recently by Lee and Seung, has been applied to many areas such as dimensionality reduction, image classification image compression, and so on. Based on traditional NMF, researchers have put forward several new algorithms to improve its performance. However, particular emphasis has to be placed on the initialization of NMF because of its local convergence, although it is usually ignored in many documents. In this paper, we explore three initialization methods based on principal component analysis (PCA), fuzzy clustering and Gabor wavelets either for the consideration of computational complexity or the preservation of structure. In addition, the three methods develop an efficient way of selecting the rank of the NMF in low-dimensional space.     

P2P技术在远程教育系统开发中的应用研究

视频教学是远程教育开发中的一个子系统，设计上采用基于P2P的分布式视频教学系统结构。解决了服务器自身资源的限制，合理使用用户计算机空闲的资源提供部分服务，使得整个系统的能力得到极大的提高。     

放疗并局部注射IL-2 治疗鼻咽癌颈淋巴结转移残存的临床评价

目的: 探讨鼻咽癌颈淋巴结转移残存放疗并局部注射IL-2 治疗的疗效。方法: 初治鼻咽癌患者颈部常规照射DA 6000-6800 cGy, 颈淋巴结转移残存对照组常规深X 线垂直局部加量照射DA1000 cGy,治疗组除常规加量照射外, 尚给予颈淋巴结残存局部基底注射IL-2 40 万u, 每周1 、3 、5 各1 次。结果: 治疗组和对照组的淋巴结消失率分别为93. 8 %和71. 0 %( P <0. 05); 满3 年后颈部无瘤生存率分别为66. 7 %和33. 3 %( P <0. 05); 1 、2 、3 年生存率在治疗组分别为73.8 %、59.5%、42.9 %, 在对照组为51.2 %、36. 6 %、22. 0 %( P <0. 05) 。两组副反应的差异无显著性。结论: 加量放疗并IL-2 局部注射治疗鼻咽癌颈淋巴结转移残存可以显著提高颈淋巴结转移的局部控制率, 是一种有效的治疗或补救治疗手段。     

Experimental investigation on gasification characteristic of high lignin biomass (Pongamia shells)

Pongamia residue (shells) is the byproduct from the biodiesel processing industry, which is a lignocellulosic biomass material. It is not suitable as feedstock in downdraft wood gasifier due to low bulk density (146 kg/m³) of shells as compared to wood (more than 350 kg/m³). Pelletization and gasification of pelletized shells was carried out in the present work. The heat transfer analysis in pellets of 17 mm and 11.5 mm was also carried out to evaluate thermal properties of this biomass. Shell pellets of 17 mm and 11.5 mm diameter and length in the range of 10–60 mm were gasified in a 20 kW_e downdraft wood gasifier. The complete gasification of pellets with 17 mm diameter could not be achieved because of less porosity and presence of larger thermal gradient within the pellets. The gasification efficiency was 73% for 17 mm diameter pellets which is lower than that of 11.5 mm diameter pellets which was 95%. The calorific value of producer gas generated from smaller diameter pellets was higher (4.66 MJ/N m³) as compared to larger diameter pellets (3.98 MJ/N m³). Tar formation during gasification of smaller diameter pellets was low as compared to larger diameter pellets.     

Fortification of set yogurt with passion fruit juice: Effects on fermentation kinetics,physicochemical properties,and functionality

With the purpose of developing an alternative set yogurt with high consumer acceptability, passion fruit juice, at levels that varied from 0 to 10%, was incorporated into set yogurt, and the effects on the fermentation kinetics, physicochemical properties, and functionality of set yogurt were evaluated. The results showed that the addition of passion fruit juice was simultaneously propitious for milk acidification in earlier fermentation stages and reduced the fermentation rate at later stages of fermentation. The phenolic compounds and pectin in passion fruit juice interacted with caseins to form soluble complexes, enhancing the gel strength of set yogurts by 7.5%. The aroma and flavor of the set yogurt was improved as well. However, with the addition of 10% passion fruit juice, the gel structure was destroyed, and the quality of the set yogurt was very degraded. More importantly, the addition of passion fruit juice increased the polyphenol content and significantly enhanced the antioxidant activity of the set yogurt. This investigation demonstrated the feasibility of fabricating passion fruit juice-enriched set yogurt and its superior quality compared with the corresponding normal product.     

提高有机碳氧化温度快速测定有机-无机复混肥料中有机质的含量

为了缩短分析时间,利用电热恒温油浴锅代替水浴锅,将有机一无机复混肥中的有机碳在重铬酸钾一硫酸溶液中的氧化温度提高到170～180℃,能在5～10min内完全将有机碳氧化,比用沸水浴加热氧化的时间缩短2／3,氧化更完全,方法的准确度、精密度更高。     

提升EDGE网络性能的无线网络优化方法探讨

通过对影响EDGE性能的关键因素分析,从无线网络优化角度出发,在网络资源、无线环境优化、初始接入编码设置和新功能应用等方面提出了提升EDGE性能的优化方法,提高用户感知度。