低影响开发措施的调蓄池代用模型应用研究

将暴雨洪水管理模型(storm water management model,SWMM)中的调蓄池模型作为低影响开发(low impact development,LID)设施的代用模型进行雨洪模拟,工程应用中可在没有具体LID参数条件下,采用所研究模型替代LID措施进行城市雨洪径流过程模拟。根据研究区域下垫面的用地性质、建设年份、建筑密度判断LID实施的难易程度,并采用模糊综合评判法将其分为5种地块,在5种地块上设置LID,根据单位面积调蓄深度(地块调蓄总容积与地块面积的比值)的大小,给出不同地块的LID最佳组合范式,并将各地块的LID方案采用代用模型进行替换。将代用模型应用于工程实例进行模拟,得到该排水区在不同重现期条件下的降雨径流过程,评价排水区实施LID措施的应用效果。

低影响开发设施的调蓄池代用模型研究

低影响开发(LID)模型因模拟所需参数较多,工程中一般难以实现。为此,依据主要流量关系相似原理提出LID的调蓄池代用模型对排水系统进行概化,在较高精度下实现排水区的雨洪模拟;其次,模拟获得的调蓄容积及出水孔直径,可为LID设施的工程效果提供评价依据。为验证LID设施概化为调蓄池的实际效果,选用了3种典型LID设施进行LID调蓄能力的等效性实验。针对植草沟、渗透铺装以及雨水花园,分别采用坡度为1%、3%、5%和重现期为1年、5年、10年进行交叉实验,纳什效率系数均在0. 75以上,均值为0. 9,说明采用调蓄池模型替代LID模型进行雨洪模拟是可行的,并给出了评价示例。对于其他未涉及的LID设施类型,其调蓄及径流过程在本质上与调蓄池模型相似,因此同样可根据其入流和出流特征概化为调蓄池模型进行模拟,LID代用模型理论及LID设施工程评价方法具有普遍意义。

Expansion of Lie Algebra and Its Application

Firstly we expand a finite-dimensional Lie algebra into a higher-dimenslonal one. By making use of the later and its corresponding loop algebra, the expanding integrable model of the multi-component NLS-mKdV hierarchy is worked out.

Assessment of Advanced xDH@B3LYP Methods in Describing Various Potential Energy Curves Driven byπ-π,CH/π,and SH/πNon-Bonded Interactions

Accurate description of potential energy curves driven by nonbonded interactions remains a great challenge for pure density functional approximations(DFAs).It is because the Rdecay behavior of dispersion cannot be intrinsically captured by the(semi)-local ingredients and the exact-exchange used in the popular hybrid DFAs.Overemphasizing the accuracy on the equilibrium region for the functional construction would likely deteriorate the overall performance on the other regions of potential energy surfaces.In consequence,the empirical dispersion correction becomes the standard component in DFAs to treat the non-bonded interactions.In this Letter,we demonstrate that without the use of empirical dispersion correction,doubly hybrid approximations,in particular two recently proposed rev XYG3 and XYG7 functionals,hold the promise to have a balanced description of non-bonded interactions on the whole potential energy curves for several prototypes ofπ-π,CH/π,and SH/πinteractions.The error of rev XYG3 and XYG7 for non-bonded interactions is around 0.1 kcal/mol,and their potential energy curves almost coincide with the accurate CCSD(T)/CBS curves.

Research on the Applications of Probability Model and Matrix Transformation in Data Analysis and Management under the Environment of Information Time

In this paper, we research the probability theory and matrix transformation based technique to manage the data for processing and analysis. Clustering analysis research has a long history, over the decades, the importance and the cross characteristics with other research direction to get the affirmation of the people. The probability theory and linear algebra act as the powerful tool for analyzing and mining data. The experimental result illustrates the effectiveness. In the near future, we plan to conduct more theoretical analysis on the topic.

Combined mass and heat exchange network synthesis based on stage-wise superstructure model

Integrating multiple systems into one has become an important trend in Process Systems Engineering research field since there is strong demand from the modern industries. In this study, a stage-wise superstructurebased method is proposed to synthesize a combined mass and heat exchange network(CM&HEN) which has two parts as the mass exchange network(MEN) and heat exchange network(HEN) involved. To express the possible heat exchange requirements resulted from mass exchange operations, a so called "indistinct HEN superstructure(IHS)", which can contain the all potential matches between streams, is constructed at first. Then, a non-linear programming(NLP) mathematical model is established for the simultaneous synthesis and optimization of networks. Therein, the interaction between mass exchange and heat exchange is modeling formulated.The NLP model has later been examined using an example from literature, and the effectiveness of the proposed method has been demonstrated with the results.

A new strategy to iteratively update scalable universal quantitative models for the testing of azithromycin by near infrared spectroscopy

The training set of a universal near infrared (NIR) model for quantitative analysis of a drug should cover as many samples of this drug in the market as possible. Inevitably the model may fail for new products that have different excipients and production processes. In such circumstances the model should be updated. We here propose a new strategy to iteratively update a universal NIR quantitative model for azithromycin. We prove that universal quantitative models generated from this new strategy are comparably effective for azithromycin injection powders and azithromycin tablets, compared to the strategy using hierarchical clustering method which we reported previously. Furthermore, we establish the correlation coefficient r between a new sample and the training set samples can be used to decide whether or not the model should be updated.

Zn metabolism of monogastric species and consequences for the definition of feeding requirements and the estimation of feed Zn bioavailability

A major goal of mineral nutrition research is to provide information of feed zinc (Zn) utilization efficiency and gross Zn requirements as affected by changing rearing conditions. This can be achieved only by applying precise experimental models that acknowledge the basic principles of Zn metabolism. This review article summarizes the most important aspects of Zn homeostasis in monogastric species, including molecular aspects of Zn acquisition and excretion. Special emphasis is given to the role of the skeleton as well as the exocrine pancreas for animal Zn metabolism. Finally, we discuss consequences arising from these physiological principles for the experimental design of trials which aim to address questions of Zn requirements and bioavailability.