Showing papers in "Journal of Qingdao University in 2008"

The Relationship Between Unfrozen Water Content and Temperature Based on Continuum Thermodynamics

Abstract: The unfrozen water content in frozen soils plays a key role in the thermal-mechanical characteristic of frozen soils and therefore has been studied extensively.Based on experimentations,many empirical formulas are obtained.However,singular vertex appears on these empirical formulas when temperature is zero because they lack of foundation of continuum thermodynamics.In frozen soils,the unfrozen water content is considered as an internal variable,and the work conjugated with the internal variable is the latent heat of phase change of unfrozen soil.The continuum thermodynamic theory is employed to deduce the formula of the relationship between the unfrozen water content and soil temperature.The experimental results of warm and ice-rich frozen soils agree well with the result predicted by deduced formula.

An EOQ Model for Deteriorating Items with Two-part Trade Credit

Abstract: A limited storage capacity inventory model for deteriorating items is derived under two-stage and two-part trade credit.The cost functions meeting the above condition in different situations are given.

A New Filled Function Method Applied to Unconstrained Global Optimization

Abstract: A new filled function for the unconstrained global optimization,which is based on a new definition given by Zhang,is introduced in this paper.And an algorithm from the new filled function is given.Numerical results suggest that the method is feasible.

Design of the Dipping Sonar's Hydraulic Winch Control System Based on the Digital PID Control

Abstract: In order to improve the intelligent control of thick rope of dipping sonar's hydraulic winch installed on a new kind of helicopters,one dipping sonar's hydraulic winch controlling system based on the digital PID(Proportional,Integral and Differential) control is studied and designed.Taking monolithic integrated data collecting system chip ADuC812 as the core,and adopting compound programmable logic device(CPLD) EPM7128,and Keil-C language,we design the system related software and hardware.This system is used for controlling thick rope of winch through monolithic integrated controlling circuit,direction identifying circuit,counting circuit,displaying circuit,keyboard controlling circuit,liquid crystal display circuit,digital PID controlling algorithm software and so on.In this paper,the designing thought,and the related software and hardware's realizing methods of this airborne dipping sonar's hydraulic winch control system are analyzed.

A Class of Filled Functions with Mitigators

Abstract: Several filled functions are reported to seek the global minimum of multimodal functionsThis paper proposes an alternative formulation that may reduce the non-positive definite effect of the Hessian of a filled function proposed beforeFurthermore,a class of mitigators is defined,which is applied to improve the computational characteristics of filled functionsResults of numerical experiments on testing program are also reported

A General Method of Constructing a Continuous Function Without Derivatives by Function Series

Abstract: In this paper,a general method to construct a continuous function without derivatives is obtained,the function constructed by bounded period function φ(x) and sequence {an}{bn} which satisfies some conditions is continuous and non-derivables.

Research on Multiple Targets Tracking Using Information Fusion Based on Sensors and Simulation

Abstract: View of the problem that the precision of targets gained by radar is low, azimuth gained by infrared sensor with high precision is introduced to improve azimuth precision of targets fused. In addition, FAFDA model based on adaptive α-β filter and coordinates transfomation is established. Simulation experiment for targets simulated in battlefield is conducted. Experimental result indicates that the most azimuth error is 6 mrad and the most pitching error is 5 mrad based on fusion data, which validates that the algorithm can real-time track targets. This algorithm makes good use of merits between radar and infrared sensor to reduce rapidly the azimuth error of targets fused.

Recent Advance in Fabrication of Aligned Nanofibres via Electrospinning

Abstract: Electrospinning is a simple and versatile technique for fabricating nanofibers from a rich variety of functional materials.The normal fabricated electrospun fibres are randomly oriented and their diameters are in the range of micrometers and nanometers.Recently,researchers have paid more attention to the aligned nanofibres because of their unique electrical,magnetic and optical properties.In this article several approaches to collecting aligned electrospun nanofibres are reviewed.

Purification Process of Total Flavonoids from Chinese Winter Jujube with Macroporous Resins

Abstract: The characteristic of absorption and separation of five kinds of macroporous resins to extract total flavonoids of Chinese Winter Jujube(CWJ) was studied. Suitable resin for purification of total flavonoids was screened from five resins, and its characteristic of absorption and separation was investigated. The results showed that X-5 macroporous resins had better adsorbing and separating property for purification of total flavonoids from Chinese Winter Jujube. The optimum absorption conditions were that the time of absorption equilibrium was 1.5 h, the concentration and the current velocity of the original solution were 0.8 mg/mL and 3 mL/min, and pH was 3.0 while the maximum adsorbing capacity for total flavonoids in Chinese Winter Jujube was 44.34 mg/g. The total flavonoids was separated and purified with 2BV desorbing volume of ethanol concentration 50%, 70% ethanol gradient desorption. In this condition, the elutive ratio was 82.42%,the purity of total flavonoids was 83.07%.

Survey of Information Security Risk Assessment Research

Abstract: In order to get a comprehensive knowledge to the present situation and the frontier technique of the information security risk assessment, the article introduces in detail the correlative knowledge of the risk assessment, for example: theory, models, present situation and so on, compares the situation of the risk assessment technological developments between domestic and foreign countries, discusses methods and tools of the appraisal. Study shows that nonstandard and poor exercisable in appraisal implementation still exists in home. And it is necessary for us to consummate appraisal standard and improve appraisal methods using the mature foreign experience, for example: entire international standard system, OCTAVE and so on.

Research of Buck-Boost Converter for Trains

Abstract: A new type of converter for train was designed.The input voltage of the converter is from 35 V to 90 V and the output voltage is 50 V.The rated output power of the converter is 300 W.The Buck-Boost topology was adopted in the main circuit,and the two parallel MOSFETs were driven respectively by means of complementary control.The SG3525 which can give out two complementary PWM signal was used as controller.The small-signal model of the buck-boost converter in Continuous Conduction Mode(CCM) was built by state-space average method,and the control-to-output transfer function of the power link was deduced.The bode diagrams of the open-loop transfer function were drawn using in Matlab,and the double poles-double zeros compensating network was designed and the parameters were calculated through analyzing characteristics of bode diagrams.The simulation model of the converter was established by Matlab/Simulink and the simulation result was given.Within the range of the changes of the input voltage,a series of experiments in light load and heavy load were made.The Simulation and experimental results are presented to verify the validity of and correctness of the method and the theory.

A Research of Image Retrieval Based on Relevance Feedback And Multi-Feature Integration

Abstract: This paper firstly proposes an image retrieval method based on color-space histogram, which designs rectangular overlapped sub-regions to get color histogram in each region. Co-occurrence matrixes and Gabor filters are proposed to describe the texture feature. Then this paper puts forward combining Co-occurrence matrixes, Gabor filters and the improving color distributing approach to extract images features. In order to make retrieve images more effectively, this paper uses a relevance feedback mechanism. Finally, the precision and recall of single feature, multi-feature integration and relevance feedback are calculated and compared.

Research on Application for Color Matching in Textile Dyeing Based on BP Neural Network Adapted by Bayesian Regularization Algorithm

Abstract: In order to solve the weak generalization capacity problem about the general and improved BP algorithms,how to raise generalization capacity of BP neural network by joining the Bayesian Regularization algorithm and the LM algorithm has been researched in this paper.Based on the same network size or error probability,the results show that Bayesian Regularization algorithm has better generalization capacity than the general and other improved BP algorithms,and it has higher convergent speed.The recipe of the method adapted by joining the Bayesian Regularization algorithm and the LM algorithm show that it is very close to the experiment data.This proves that the algorithm researched in this paper is feasible.

Energy-Shaping Control and Simulation of Three-Phase PWM Rectifier

Abstract: Basing on energy-shaping and port-controlled Hamilton control,the model and controller of three-phase voltage source PWM rectifier are presented.First of all,a PCH mathematical model of three-phase voltage source PWM rectifier is established in the d-q rotation frames.Then,according to the target of the controller design,the desired equilibrium point of the system is obtained.Using the energy-shaping theory of interconnection and damping assignment,the PCH feedback control theory of three-phase voltage source PWM rectifier is given.Feedback stabilization controller is designed through energy-shaping and matching the parameter,the stability of equilibrium point is analyzed finally.The simulation results show that this method can make PWM rectifier run with unit power factor,the output DC voltage stabilize on the desired value with the fast dynamic response.The characteristics meet the design demands.

Aligned Carbon Nanotube Arrays Prepared by Chemical Vapor Deposition

Abstract: Carbon nanotubes(CNTs) have been applied in many fields,such as field emission electron sources,scanning probes,chemical sensors,field-effect transistors,and so on.Vertically aligned carbon nanotubes(CNTs) were fabricated on a silicon subtract by chemical vapor deposition(CVD).Field Emission Scanning Electron Microscope(FESEM) and Transmission Electron Microscope(TEM) were employed to investigate the morphologies,structures and phases of the system.We discussed the impacts of catalyst,reaction temperrature and growth time to the growth of CNTs.The catalyst with corresponding of 2 mol/L is the most appropriate for the vertically aligned CNTs growth.The diameter of CNTs gets larger when the reaction temperature rises or the growth time extends.The growth of vertically aligned CNTs in this paper has two modes: tip-growth and root-growth mode.

Cell Monitoring and Its Application on a Fuel Cell Engine

Abstract: Every single cell in Proton Exchange Membrane Fuel Cell(PEMFC) will directly affect the operation state of entire fuel cell stack,and so real-time monitor for single cell voltage is needed.This paper introduces a Single Cell Voltage Monitor(SCVM) System for a 5kW PEMFC stack applied on a mini fuel cell car.The structure with certain key circuit analysis,the working principle and programming design of the SCVM system,which communicates with a Fuel Cell Control Unit(FCU) through CAN-BUS,are described.An outlook of the system is given for further investigation.

Investigation on the Properties of Gemini Surfactants N,N'-Diacyl-Ethylenediamine-Sodium Diethylsulfonate

Abstract: A series of Gemini surfactants-N,N'-diacyl-ethylenediamine-sodium diethylsulfonate was synthesized by addition and acylation,using sodium vinylsulfonate,ethylene diamine and fatty acids as raw materials.Their surfacial tensions,emulsion properties,solubilization abilities and foaming properties were investigated.Experimental results show that the critical micelle concentrations(cmc) of N,N'-dioctanoyl-ethylenediamine-sodium diethylsulfonate(DTM-8),N,N'-didecanoyl-ethylenediamine-sodium diethylsulfonate(DTM-10) and N,N'-dilauroyl-ethylenediamine-sodium diethylsulfonate(DTM-12) are 2.0,0.5 and 0.4 mmol/L respectively,about an order of magnitude lower than those of traditional surfactants.Their surfacial tensions at cmc are 35.0,26.7 and 20.8 mN/m,respectively.Their maximum solubilization capacities for hexane are 0.85,0.87 and 0.91 respectively,higher than those of C12H25C6H4SO3Na(0.64) and C12H25N+(CH3)3Cl-(0.68).The emulsion ability and foaming property of the surfactants increase with the lengths of acyl chain.

A Multi-item Ordering Model with Incremental Quantity Discount and Fund Constraint

Abstract: In multi-item ordering problems with fund constraint,when the supplier offers incremental quantity discounts,the retailer will adjust the inventory policy to minimize the inventory cost.This paper researches on the multi-item ordering models with incremental quantity discounts and fund constraint,gets the optimal ordering policy to minimize the inventory cost by the Economic Ordering Quantity Model,and an algorithm and numerical example are given to verify the conclusion

Road Roughness Study of Jiaozhou Bay Expressway

Abstract: Road roughness is the most important excitation of vehicle driving,and the detail results can put forward some important reference to vehicle dynamic analysis and reliability testIn this study,road spectrum analysis was conducted on hard soil subgrade and soft soil subgrade of Jiaozhou Bay expressway,and then,the roughness of Jiaozhou Bay expressway was quantitatively described,the acceleration power spectrum and density of displacement power spectrum curve graph of Jiaozhou Bay expressway are acquiredThe conclusion suggests that the general characteristic variance of both subgrades is close to the fitting characteristic;with correlation coefficients are 094 and 096,respectively,showing that the fitting expression of pavement displacement power spectrum is correctIn low frequency band,most of the road segment is in the range of B-grade and C-grade with large spectral values,conversely in A-grade with small spectral values in high-frequency band

Determination of γ-polyglutamic Acid by Ultraviolet Spectrophotometry

Abstract: This paper establishes an ultraviolet spectrophotometric method for determination of γ-polyglutamic acid.After hydrolysis γ-polyglutamic acid became aminoglutaminic acid which could shape comoles compound(1∶1) in pH 9.6 of borax buffer solution with chloranil.The comoles compound had absorption maximum at 350 nm.Thus we determined γ-polyglutamic acid by utilizing its absorbance.There was good linearity in the range of 8～12 μg/mL of γ-PGA(r=0.998 1) and the average recovery was 99.5% with RSD of 1.0%.The method is simple,reliable and reproducible which can be used to assay γ-PGA.

Optimal Rejection with Zero Steady-State Error for Control Systems

Abstract: The problem of optimal rejection with zero steady-state error for linear systems with persistent disturbances is considered.Based on the internal model principle,a disturbance compensator is constructed such that the system model with external disturbances is transformed into an augmented system without disturbances.Consequently the problem of disturbance rejection for zero steady-state error is transformed into the optimal control problem for systems without disturbances.By the order criterion of controllability and observability,the augmented system has been proved to be controllable and observable.By the optimal control theory,the obtained optimal feedback control law can cancel disturbances completely and is more robust.

Preparation of ZrOCl_2/PVA Composite Nanofibres by Electrospinning

Abstract: ZrOCl2/PVA composite nanofibres were prepared by electrospinning,and the influence of some parameters such as size of spinnernet and voltage on composite~Isids studied.The experimental results show that the diameter and the distribution of composite nanofibres increase respectively with the increasing of the size of spinneret.The beaded structure of composite nanofibres disappears gradually with the enhancement of the applied high voltage and even disappear.In addition,the soft web structure comes into being because of the interaction of composite nanofibres by electrospinning onto a liquid reservoir collector.

The Effect of Feeding Order on Magnesium Hydrate Deposition

Abstract: Using brine in producing magnesium hydrate and magnesium oxide is a new process,new technique,and an important way in settling destructive magnesium.The method is also a clean project in using Lake Magnesium Resources.Magnesium hydrate is a multipurpose chemical industry product,but it is a flocculent precipitate.It is difficult to separate magnesium hydrate.So the operating process and selecting equipment are required highly.We have searched in this field for a long time.On the basis of previous research,to get the optimal deposition of magnesium hydrate,single factor experiment has been done in this paper.It is feeding order.The deposition speed is measured by the height of the upper clear liquid,the filtering time,and the washing filtering time.Furthermore the grain size is analysed by microscopic method.The result is that adding ammonia liquid to brine is the better feeding order.Using this feeding order can get bigger grain size,shorter filtering time,and washing filtering time.

Corner Detection Algorithm based on Template

Abstract: Based on the strategy of detecting template,a new algorithm of corner detection was presented.A 3×3 square template was designed,which includes all possible models of corners in image.These models were coded according to a specific rule,and positions of these corners can be located by the template after denoising,swelling,and thinning.Experimental results show that this algorithm can detect corner automatically without manual interposition,and average location errors of corner is within one pixel,compared with Harris algorithm.

Statistical Analysis on the Tensile Strength of Basalt Fiber

Abstract: The tensile strength of basalt fibers is limited by stochastic defects.Thus,the tensile strength shows itself in polydispersity.Dispersity can be assessed by Weibull theory.In the paper,experimental data was processed by Weibull theory and Weibull modulus were calculated with two-and three-parameter Weibull distribution.Furthermore,the relationship between Weibull modulus and mechanical properties was studied.The results show that the tensile strength of basalt fiber is preferred to be expressed with three-parameter Weibull model.The surface and fracture characteristics of the basalt fibers were also observed with Scanning Electron Microscope(SEM).The results explain the tensile strength difference between glass fibers and basalt fibers.

The Basic Mechanical Properties and Model of Milk Fibers

Abstract: In order to understand the mechanical properties of the milk fibers,the basic properties of the milk fibers are measured with different instruments.By the analysis of the results,the following conclusions can be deduced: in the dry and wet state,the breaking strength of the milk fibers is lower than that of the acrylic and the breaking elongation is near to that of the acrylic.In the wet state,the breaking strength of the milk fibers is lower and the breaking elongation is higher than that in dry state.The tenacity and elongation at break in looped configuration are remarkably reduced.All these three models fit reasonably well with the experimental results,but there are some models that fit better.For straight modality the best fit corresponds to the four nonliner viscoelasticity model.For knotted modality the best fit corresponds to the four nonliner viscoelasticity model and the Vangheluwe model,and for looped test,the best fit corresponds to the polynomial model.

Realtime On-Road Vehicle Detection Approach Based on Tree Structure

Abstract: Aiming at the importance of realtime on-road vehicle detection in driver assistance systems,autonomous driving and active safety,a vehicle detection algorithm based on tree structure is introduced.Haar-like features are used in this application,and Gentle AdaBoost algorithm is chosen to train the strong classifiers wich form the tree structure vehicle classifier.The data sets are collected,and vehicle detection classifier is trained and evaluated.The experiments on test data sets wich contain 750 target vehicles show that the detection rate is 74.4% and the processing time is about 34.4 ms.It can be seen that the tree structure classifier is significantly efficient and robust.

Behavioral Asset Pricing Model Based on Investor Sentiment

Abstract: A behavioral asset pricing model based on investor sentiment is built by using the theory of DHS and the effect of investor sentiment on the asset price is analyzed.Some anomalous phenomena such as overreaction and excess volatility can be explicitly explained by using the above model.Simulated results show that invenstor's sentiment has a negative effect on market return with long-term,and the investor with sentiment make asset price fluctuate largely in short term.

Study on the Stresses and the Maximal Admissible Drawing Load of Flexible Pressurized Anchor

Abstract: Flexible pressurized anchor is a kind of new anchor.Mechanical model for the anchor was established,and the formulas of longitudinal stress,radial stress and hoop stress were deduced.Utilizing strength theories,the anchor strength conditions about steel wire,high elastic rubber and its gluing section were established.The maximal admissible drawing load was got,and it was compared with the test results.

PLC in Musical Fountain Control System's Application

Abstract: In order to improve the effect of musical fountain,PLC,multi-point control system,is applied to replace a large number of relay circuits.PLC can control SSR,the colorde lantern,the spotlight and the water pump in musical founain multi-points control system by writing some procedures and simple connections,and carry on the smooth movement and accomplish logic chain of protection for the control of movement according to the logical condition.The result indicates that PLC can not only achieve water-switching,but also control musical fountain up and down with music.The PLC make floral formula change easily and the design of programming SFC is clear.