Extended activated sludge model no. 1 (ASM1) for simulating biodegradation process using bacterial technology

Phosphorus is one of the most important nutrients required to support various kinds of biodegradation processes. As this particular nutrient is not included in the activated sludge model no. 1 (ASM1), this study extended this model in order to determine the fate of phosphorus during the biodegradation processes. When some of the kinetics parameters are modified using observed data from the restoration project of the Xuxi River in Wuxi City, China, from August 25 to 31 in 2009, the extended model shows excellent results. In order to obtain optimum values of coefficients of nitrogen and phosphorus, the mass fraction method was used to ensure that the final results were reasonable and practically relevant. The temporal distribution of the data calculated with the extended ASM1 approximates that of the observed data.     

Lower back muscle forces in pushing and pulling

Abstract

In the investigation of lower back stress, the muscle forces of the erector spinae and the rectus abdominis are often calculated using the two-dimensional biomechanical model. These muscle forces are used to estimate the compressive forces at L5/S1 disc This paper presents a study of the muscle forces predicted by a two-dimensional biomechanical model during pushing and pulling and myoelectric activity from the corresponding muscles. The goal was to investigate whether a simple two muscle torso model would reasonably estimate the muscle actions in pushing and pulling tasks. Six subjects participated in the experiment. EMG (rms) value was used as an indicator of muscle forces. The results show high correlation between the predicted muscle forces and the measured root-mean-square EMG values in trunk pushing and pulling (r²=0.93) and hand pushing and pulling (r²=0.96) in an erect posture with hips braced but low in hand pushing and pulling using a free posture (r²=0.37).     

（2＋1）维KD方程组的行波解

通过行波变换将（2＋1）维KD方程组转变为复域中的常微分方程,给出复化的（2＋1）维KD方程组的亚纯解结构.     

Oxidation behaviors of Ni-Cr-Al superalloy foams at 1 000 ℃ in air

The oxidation behaviors of Ni-16Cr-xAl （x=4.5%, 9.0%, mass fraction） superalloy foams in air at 1000℃ were investigated. The effects of AI content on the resistance to high temperature oxidation were examined. The oxidation mechanisms of the foams were discussed. The results show that the resistance to the oxidation of the Ni-16Cr-xA1 based alloy at 1 000 ℃ increases with the content of A1 increasing from 4.5% to 9.0%. Complex oxide products are formed on the surface of the superalloy foams after the oxidation. Cr203 and A1203 are the predominant oxides for the scales of the foams with 4.5% A1 and 9% A1, respectively. Excellent high temperature oxidation resistance and superior pore conformation stability for the Ni-16Cr-xA1 based superalloy foam with 9% A1 can be mainly attributed to the formation of relatively continuous and protective A1203 oxides on the surface of the foam.     

CrAIN／TiAIN纳米多层膜的微结构及其性能研究

采用磁控反应溅射法制备了不同调制周期的CrAIN／TiAIN纳米多层膜,并通过x射线衍射仪、显微硬度计、扫描电镜分析了调制周期对多层膜的微结构、力学性能和高温抗氧化性能的影响。结果表明：CrAIN／TiAIN纳米多层膜共格外延生长,呈现CrAIN（或TiAIN）面心立方结构,且呈（111）择优取向;CrAIN／TiAIN纳米多层膜在某些调制周期出现硬度异常升高的超硬度效应;CrAIN／TiAIN纳米多层膜比CrAIN,TiAIN单层膜具有更好的高温稳定性,高温时仍具有较高的硬度。     

Mn2+掺杂对LiFePO4正极材料结构、性能及嵌锂动力学的影响

为了改善橄榄石型LiFePO4正极材料的性能,采用高温固相法合成了Mn掺杂的LiMnxFe1-xPO4(x=0,0.10,0.25,0.40,0.50)材料.采用X射线粉末衍射、扫描电子显微镜、充放电测试、循环伏安和电化学阻抗谱研究了材料的结构、电化学性能和锂离子嵌脱动力学.结果表明,锰掺杂的LiFePO4样品颗粒分布比较均匀,具有较小的平均粒径和窄的粒度分布,LiMnxFe1-xPO4是纯相的橄榄石结构.在不同倍率下,LiMn0.4Fe0.6PO4具有最高的放电容量和最好的动力学性能.Mn的掺杂提高了LiFePO4材料的可逆性、锂离子扩散系数和放电容量,减小了电荷转移电阻,进而提高了其动力学性能.     

Rank-1 constraint for camera calibration based on spheres

With the rank-1 constraint, a method for camera intrinsic parameters calculation based on spheres is proposed. The geometric interpretation of the rank-1 constraint is explored from the relation of the image of the absolute conic and the sphere image. Three algebraic equations are derived from the rank-1 constraint. The relation of the sphere images and the camera intrinsic parameters is clearly interpreted in vision geometry. Finally, a nonlinear optimized method is used with the three constraint equations for improving the accuracy. Experimental results show that our method is robust. Compared with the traditional method, it can improve the accuracy of the results of the intrinsic parameters.     

超滤与纳滤膜技术应用于桑叶中1-脱氧野尻霉素分离浓缩的效果观察

选桑叶为原料,以膜通量、膜通量衰减指数、DNJ透过率和杂质去除率为指标,探究三种超滤膜UF1、UF2和UF3对桑叶中1-脱氧野尻霉素（DNJ）分离效果以及两种纳滤膜NF1和NF2对DNJ的浓缩效果.研究结果表明：三种超滤膜中UF2最适于DNJ的分离,UF2-UF3联合处理（即UF3＊）的效果更佳,且两者的最优操作压力分别为0.8MPa和1.5MPa.与NF1相比,NF2蚋滤膜对DNJ的浓缩效果显著,浓缩倍数可以达到10.1,对DNJ的截留率为81.94％,DNJ纯度为4.65％.     

校企深度合作下高职艺术设计专业教学模式探析——以纺织品设计专业基础课程“图案艺术设计”为例

探索了学校、行业、企业三方对接的高职艺术设计专业教学模式,以高职纺织品设计专业基础课＂图案艺术设计＂为突破口,探索了＂1＋2＋3＂教学模式,形成了与之相适应的方案。方案遵循＂入门→入行→入职＂递进式的培养思路,从转变教育观念,调整知识结构,改革教学模式,改进教学方法和技术,变更教学效果与评价等方面,由理论到实践,由校内到校外循序渐进地进行,能够更好地适应行业发展对应用型人才的需求。