光催化-Fenton工艺处理废纸制浆废水

为有效处理废纸制浆废水,采用氙灯照射下的光催化-Fenton技术,研究不同反应器、曝气、草酸钾、H2O2投加方式和废水质量浓度对光-Fenton工艺去除废水中TOC或吸光度的影响.结果表明,提高光照强度可提高TOC去除率;添加适量的草酸钾可提高处理效果;H2O2分两次投加可取得较好的处理效果,大大减少对催化剂的需求;在处理过程中使废水暴露于空气可提高有机物的脱氯效果,但曝气对处理效果并无益处.对于TOC为185 mg/L左右的废纸制浆废水,在[H2O2]=1000 mg/L、[Fe(Ⅱ)]=100 mg/L、pH=3.0、温度为30℃的条件下,经过30 min处理,废水的TOC可去除63%以上.     

具有两类失效状态和休假的串联可修系统

研究了修理工可多重休假的部件串联可修系统,每个部件有两类失效状态。假定部件寿命服从指数分布,部件修理时间和修理工休假时间均服从一般连续分布,利用向量Markov过程理论和Laplace变换的方法求出了系统的可靠性指标。     

基于传递原理的稠油热驱机理研究

运用传递基本原理,以热驱域势场做研究载体,采用寻求"统一评价判据",解析"过程动态特性"的研究思路,在构建以驱动和驱抗势场为主体的热驱模型基础上,确认驱动(功)即是评价各势场作用的统一判据;运用传递分析揭示参与势场的动力特性与阻力特性,研究其协同作用机制;定义并运用场阻影响因子,以判别诸势场在驱油过程中的影响权重.     

考虑过程能力和成本的刀具策略研究

为了提高定期维修的刀具所加工的产品质量,减少停机时间和生产成本.考虑生产过程中工件尺寸的残差是时间的函数,利用Glejser检验方法,拟合工件尺寸残差符合的递增型异方差模型,提出了刀具磨损过程的过程能力指数计算方法;使用Bernstein概率密度函数描述刀具寿命和刀具磨损过程的一般特征,在每一个维修周期内均满足顾客要求的最小过程能力指数基础上,考虑质量损失、换刀成本、由刀具的突然失效引发的惩罚成本及维修刀具所需的成本,将过程能力与成本相结合,提出了用于确定最佳刀具初始状态和维修周期的模型.该模型为实际生产提供了一种离线的刀具管理方法.     

GM(1,1)模型在虚拟仪器测量过程控制中的应用

虚拟仪器的测量过程控制是保证测量数据有效的重要手段,利用灰色系统GM(1,1)模型对虚拟仪器的测量过程进行控制,由少量数据信息得到未来的预期测量结果,通过与核查标准的测量结果相比较来判别测量过程是否受控.论文给出了测量过程控制判别限、适用灰色系统GM(1,1)模型的条件以及模型精度检验判据.     

精制棉电催化氧化技术及工艺研究

利用电催化氧化技术使棉短绒发生快速断裂反应,同时使木质素、果胶等带色基团退色,减少污水处理难度。生产的精制棉纤维素一致性率、a-纤维素含量达到98%以上,聚合度降低到700DP,反应时间由原来的2.5h缩短到20min,色度减少80%。通过实践,实现了生产精制棉节能降耗的目的,且明显减轻了对环境的污染。     

Similarity identification method on formational interfaces and application in general granite

An instrumented drilling system can be applied for the acquisition of drilling process parameters.The system can provide continuous and huge data for geotechnical engineering.However, due to the complexity of ground strata, the variation in the drilling parameters with stratigraphical characteristics is great and the correlation between likely comparable parameters is not high, which limits the use of conventional correlation approaches in this field.How to use the data for engineering and how to get a reasonable interpretation for the relationships among the drilling parameters, as well as between a drilling parameter and formational character-istics, become a technical choke point for the development and application of the instrumented drilling system.Based on similarity criteria, the extraction of sample data and characteristics, the pretreatment of data and feature matching algorithms have been ana-lyzed and an approach of slope coefficient searching identification has been established.A case study was carried out for the similar-ity between the rotational speed of the drill bit, flushing pressure, and effective thrust force graphics in general weathered granite.The result shows that the similarity coefficients between the rotational speed of the drill bit, flushing pressure, and effective thrust force are 0.72 and 0.83, respectively.Although there are differences between the distances of the graphics, the curves of both rota- tional speed and flushing pressure agree with the effective thrust curve in shape, which provides a possible method for the identifica- tion of various formations by use of the similarity between feature drilling parameters.     

Identification and fermentation optimization of protopectinase-overproducing strain Aspergillus niger CD-01 for pectin production

In order to solve the citrus peel resource waste problem and minimize the drawbacks of chemical extraction of pectin, a protopectinase-overproducing strain CD-01 for pectin production was isolated from a pit soil dumped with perished orange in Changde City, Hunan Province of China. The strain CD-01 had the same morphology and 28S rRNA gene sequence (FJ184995) as that of Aspergillus niger (ATCC 64028). It was thus identified and named as Aspergillus niger CD-01. The fermentation condition was optimized based on L₉(3⁴) orthogonal experimental design and the variances analyses. The results show that the optimal condition for producing pectin is as follows: time 36 h, temperature 35 °C, pH 5, and urea as the nitrogen source. Under this condition, the pectin yield can reach up to 24.5%. This shows a great potential of Aspergillus niger CD-01 in pectin extraction from citrus. Foundation item: Projects(50621063, 50674101) supported by the National Natural Science Foundation of China     

超高层钢结构建筑圆管柱的制作技术探讨

随着钢结构的不断发展,钢结构在越来越多的领域得到了广泛的应用,其技术日益成熟.为了不断提高钢结构工程的制作技术,根据青岛开发区国际贸易中心钢结构的特点和设计要求,结合其制作过程中的加工工艺,介绍了超高层钢结构建筑主体——大型圆管柱在制作中的生产工艺和加工流程,重点阐述了圆管柱的制作、组装、焊接等方面的要点,提出了一些加工过程中的建议,对其他相同结构形式的钢结构建筑具有一定的借鉴作用.