Mixed Model for Silt-Laden Solid-Liquid Two-Phase Flows

The kinetic theory of molecular gases was used to derive the governing equations for dense solid-liquid two-phase flows from a microscopic flow characteristics viewpoint by multiplying the Boltzmann equation for each phase by property parameters and integrating over the velocity space. The particle collision term was derived from microscopic terms by comparison with dilute two-phase flow but with consideration of the collisions between particles for dense two-phase flow conditions and by assuming that the particle-phase velocity distribution obeys the Maxwell equations. Appropriate terms from the dilute two-phase governing equations were combined with the dense particle collision term to develop the governing equations for dense solid-liquid turbulent flows. The SIMPLEC algorithm and a staggered grid system were used to solve the discretized two-phase governing equations with a Reynolds averaged turbulence model. Dense solid-liquid turbulent two-phase flows were simulated for flow in a duct. The simulation results agree well with experimental data.     

Numerical Simulation of Gas-particle Flows with Different Swirl Numbers in a Swirl Burner

ＩｎｔｒｏｄｕｃｔｉｏｎＳｗｉｒｌｂｕｒｎｅｒｓａｒｅｗｉｄｅｌｙｕｓｅｄｉｎｐｕｌｖｅｒｉｚｅｄｃｏａｌｆｉｒｅｄｂｏｉｌｅｒｆｕｒｎａｃｅｓ.Ｔｏａｃｈｉｅｖｅｈｉｇｈｅｆｆｉｃｉｅｎｃｙａｎｄｌｏｗｐｏｌｌｕｔｉｏｎｃｏｍｂｕｓｔｉｏｎ,ｎｕｍｅｒｉｃａｌｓｉｍｕｌａｔｉｏｎｉｓｎｅｅｄｅｄｔｏｐｒｅｄｉｃｔｔｈｅｓｉｚｅｏｆｔｈｅｒｅｃｉｒｃｕｌａｔｉｏｎｚｏｎｅ,ｔｈｅｉｎｔｅｎｓｉｔｙｏｆｔｈｅｒｅｃｉｒｃｕｌａｔｉｎｇｆｌｏｗｓ,ｔｈｅｐａｒｔｉｃｌｅｇａｓｍｉｘｉｎｇａｎｄｔｈｅｒｅ…     

Statistical Theory and Related Fields征稿通知

<正>Statistical Theory and Related Fields(《统计理论及其应用》)是由华东师范大学与中国现场统计研究会合作主办,并由华东师范大学与英国泰勒-弗朗西斯(Taylor-Francis)合作出版的国内首家统计学领域英文学术期刊,旨在积极推动和促进现代统计理论及其在自然科学、医学、经济学和社会科学等相关领域内的应用,助力中国学者走向国际学术前沿,刊物建设的目标是:成为发布和传播一流研究成果的国际学术平台。Statistical Theory and Related Fields计划于2017年正式出版(季刊),主要栏目     

Depth-averaged Nonlinear k-ε Model and Technique for Its Program Development

１ＭｏｄｅｌＩｍｐｒｏｖｅｍｅｎｔ１１Ｄｅｐｔｈａｖｅｒａｇｅｄｋ－εｍｏｄｅｌＡｓｕｍｉｎｇａｈｙｄｒｏｓｔａｔｉｃｐｒｅｓｕｒｅｄｉｓｔｒｉｂｕｔｉｏｎ,ｕｓｉｎｇｔｈｅＬｅｉｂｎｉｔｚｅｑｕａｔｉｏｎａｎｄｉｎｔｅｇｒａｔｉｎｇｔｈｅｔｈｒ...     

Depth-averaged Nonlinear k-ε Model and Technique for Its Program Development

Without the 'rigid lid' assumption, the depth-averaged linear k-ε model can describe the change of water depth. However, it is incapable of accurately simul ating turbulent flows, where the normal Reynolds stresses play an important role. A de pth-averaged nonlinear k-ε model is developed taking into account the stress relations described by Speziale. The depth-averaged linear and nonlinear k-ε models can both be used to calculate the flow field near a side discharge into open-channel flo w, but the results of the nonlinear model are in much closer agreement with experimental re sults. Furthermore, the technique of changing the 2D linear k-ε program i nto a depth-averaged, nonlinear program is presented.     

New Wavelet Theory and Application in Nondestructive Testing

A new ultrasound signal processing model that provides fast real-time performance was developed. The model is based on the “rotation angle series fast wavelet transform“ algorithm developed for realtime digital signal processing. Instead of the traditional convolution-based algorithms, the algorithm uses a cascaded structure which can be quickly implemented on digital signal processors. The algorithm runs twice as fast as and is more flexible than the fast wavelet transform, and is applicable for multi-channel and phased array ultrasound systems. By using this algorithm, multi-channel ultrasound systems, including phased array ultrasound systems can have less complex software and hardware designs, lower cost,smaller size, and especially more powerful functions.     

Genetic Algorithm Based on New Evaluation Function and Mutation Model for Training of BPNN

IntroductionArtificial neural networks are used extensively forprocess prediction,fault diagnosis,and dataclassification in chemical engineering[1] .Backpropagation neural networks ( BPNN) arefrequently adopted in these applications for theirpowerful mapping ability[2 ,3 ] .However,a numberof problems lie in modeling by BPNN,forinstance,the training process is easily converged atlocal minima.Much research has been focused onthe techniques to overcome local minima.Fukuoka,Matsuki,Minamitan…     

Interactors and a Third-order Interacting Model for Effective Elastic Properties of Damaged Solids

ＩｎｔｅｒａｃｔｏｒｓａｎｄａＴｈｉｒｄ┐ｏｒｄｅｒＩｎｔｅｒａｃｔｉｎｇＭｏｄｅｌｆｏｒＥｆｆｅｃｔｉｖｅＥｌａｓｔｉｃＰｒｏｐｅｒｔｉｅｓｏｆＤａｍａｇｅｄＳｏｌｉｄｓ＊ＧａｏＹｕｎｘｉｎ（高蕴昕），ＺｈｅｎｇＱｕａｎｓｈｕｉ（郑泉水），ＹｕＳｈ...     

An Elastic Absorber Theory for a Thin Fabric Sheet

The current sound absorption theory which is based on Rayleigh model believes that fibrous material absorb sound by the fluid frictional energy dissipation between the air and the solid fibers. However, Rayleigh model is only useful for a quanlitative understanding of effects in a porous material but not for calculation of the acoustical properties of real absorbent. In this paper, a new vibration sound absorption theory which is totally different from classical theory was put forward. The specific acoustic impedance of fiber layers have been derived from the membrane vibration equation and the sound absorption coefficient calculated agree with test results. The new theory can explain the phenomenon that thin fiber layers exhibit less sound absorption coefficient when it was as the cover fabric of sound absorber, but it is mare efficient to sound absorption when it was hang as the curtains or have back cavity behind it.     

SDFA： a Uniform Model for String Matching Algorithms

String matching algorithms play an important role in computer science. However, there is no uniform mathematical model to describe these algorithms. Thus, read-head-Skippable DFA (SDFA) is put for-ward, which is an extension of two-way DFA. It is proved that SDFA is equivalent to DFA. Furthermore,SDFA is a more natural mathematical model for string matching algorithms. After that, four types of the movement of the read head of string matching are analyzed and modeled by SDFA. Finally, the SDFA model of BMA string matching algorithms is given.     

Path of Building a Global City in Shanghai Based on the “Space of Flows” Theory

The Shanghai Master Plan(2017—2035) clearly states that building a global city with excellence has become the direction of its efforts in recent decades which requires Shanghai to become an important global node in the global city network structure like New York and London. Based on the space of flow theory, this paper uses the interlocking network model of Globalization and World Cities(GaWC) to calculate connective index of 48 cities whose level is alpha and above in GaWC's researches. There are still many gaps between Shanghai and other top global cities such as New York, London and Tokyo. Through the calculation of Theil Entropy, the importance ranking of the factors affecting Shanghai's status in the global city network is obtained. The results show that the proportion of foreign population, the number of sister cities, the number of headquarters of multinational corporations and the proportion of GDP in the whole country significantly affect Shanghai's status in the global city network.     

A Space State Forecast Model for Dam Construction Equipments Based on Analysis Prediction Theory

Anti-collision equipments system is developed to solve the collision problems of dam construction equipments, and in the system the determination of equipments＇ space state is important. A uniform moving equation of equipments is established based on the analysis prediction theory and the movements states of equipments. Method of least square was employed to deal with discrete data of equipments＇ space position. Fitting equation matched with the movement equation was presented to do data fitting, and a relevant algorithm was given. Applying the fitting equation, current and future space state of equipments can be accurately predicted. Finally, a case is given and results show that numerical values of data were steady and their precision was high. In LongTan dam construction of the equipments antiollision system, applying this method to forecast the equipments＇ space states and practical running of the system indicate that this method can improve the precision of position, obtain the better forecasting effect and increase the robustness of the system.     

Analysis and Application for Integrity Model on Trusted Platform

To build a trusted platform based on Trusted Computing Platform Alliance (TCPA)‘s recommendation, we analyze the integrity mechanism for such a PC platform in this paper. By combinning access control model with information flow model, we put forward a combined process-based lattice model to enforce security. This model creates a trust chain by which we can manage a series of processes from a core root of trust module to some other application modules. In the model,once the trust chain is created and managed correctly,the integrity of the computer‘s hardware and sofware has been mainfained, so does the confidentiality and authenticity. Moreover, a relevant implementation of the model is explained.     

The Model and Design for COM-Based e-Commerce Application System

ＩｎｔｒｏｄｕｃｔｉｏｎＴｒａｄｉｔｉｏｎａｌｅ ｃｏｍｍｅｒｃｅａｐｐｌｉｃａｔｉｏｎｓｙｓｔｅｍｉｓｉｍｐｌｅｍｅｎｔｅｄｂｙｕｓｉｎｇＨＴＭＬ ,ＪａｖａＳｃｒｉｐｔａｎｄＡＳＰ ,ＰＨＰ .Ｂｅｃａｕｓｅｔｈｅｂｕｓｉｎｅｓｓｌｏｇｉｃｉｓｍｉｘｅｄｗｉｔｈｔｈｅｓｏｕｒｃｅｃｏｄｅ,ｔｈｅｓｃｒｉｐｔｓａｒｅｃｏｍｐｌｅｘａｎｄｕｎｒｅａｄａｂｌｅ .Ｔｈｉｓｍｅｔｈｏｄｌｅａｖｅｓｓｏｍｕｃｈｃｏｎｖｅｎｉｅｎｃｅｔｏｐｒｏｇｒａｍ ｍｅｒｓｂｕｔａｌｓｏｍａｋｅｓｓｙｓｔｅｍｍａｉｎｔａｉｎ…     

Brittle-plastic Theory and Identification of Material Properties for Elastoplastic Structure

Ｂｒｉｔｌｅ┐ｐｌａｓｔｉｃＴｈｅｏｒｙａｎｄＩｄｅｎｔｉｆｉｃａｔｉｏｎｏｆＭａｔｅｒｉａｌＰｒｏｐｅｒｔｉｅｓｆｏｒＥｌａｓｔｏｐｌａｓｔｉｃＳｔｒｕｃｔｕｒｅＸｕＢｉｎｇｙｅ（徐秉业），ＣｅｎＺｈａｎｇｚｈｉ（岑章志），ＳｈｅｎＸｉｎｐｕ（沈新...     

A New Approach to a Local E.Government Portal for Information Management and Deep Searching

0 IntroductionThe effectiveness of any governments is reflected by itsefficiency,better services to citizens andi mproved gov-ernmental processes[1]. Many governmentstherefore have em-barked on aggressive campaigns to vastlyincrease the numberof online interactions with citizens , and to provide largeamount of online information and knowledge to citizens (aswell asto government employees)[2 ,3].Thelargest contingentof government pages ,fromthe USAandrepresented bythe .gov top-level domain,acc…     

Study and Implementation of a New SQL-Based ETL Approach

This paper analyzes the main characteristics, benefits, and disadvantages of existing traditional ETL （extraction, transformation, loading） methods, and summaries some factors affecting the performance of ETL tools. Then, a new ETL approach, E-LT （extraction, loading and transformation）, is proposed. The E-LT approach applies database mapping technique to realize that loading stage and transformation stage in the ETL process are performed at the same time after the extraction stage. Thus, it can use SQL commands to complete loading and transformation processing, and eliminates the staging area before loading in traditional ETL process. The framework of an ETL engine based on E-LT method is presented. The ETL process including initial loading and incremental refreshment is discussed in detail, and the SQL-based algorithm for initial loading is presented. The performance of E-LT method on loading throughout outperforms some commercial ETL approaches by experimental proof and theoretical analysis. At last, a real case in marine data warehousing of the E-LT method is discussed for illustrating the validity of the proposed method.     

An Order-oriented Procedure Model for A Robust and Agile Production System

The manufacturing industry in 1990's is faced with se-vere challenge among the global competition for mar-kets.Production for a small quantity and high varietyeven lot-sizes of one-digit numbers products has be-come a main trend today.Traditional production proce-dure limits the flexibility of the production system.Inthis paper,based on the analysis of the procedure charac-teristics,a design strategy for re-usage of informationand resource is introduced,and an order-oriented pro-cedure model with concurrent,hierarchical and micro-cycle structure for a robust and agile production systemis proposed in order to realize flexible and adaptive pro-duction for dynamically-changing orders.     

A Coordination Model of Gene Sequences for SARS-CoV and its Receptor

IntroductionFrom the emergence of SARS CoV, manystudies havebeen done on its biological medicine aspects, such aspathogeny characteristics, mechanisms of causing disease,clinic diagnosis and treatment, bacterin development andthe spreading rules. At the level of molecule biology,studies have been done on its genome sequences characteristics, structures and functions of the translatedproteins, and the evolution relationships in sequences[1 5].The caus…     

Frame Design and Reality of Numerical Model for Sculptured Part Machining

The importance of the numerical model for sculptured part machining based on virtual environment is introduced. Meanwhile, the general frame of the numerical model is proposed, and the techniques of developing the numerical model are discussed in detail.