Abstract: The law of motion of the dust was studied.After the dust samples were treated by liquid-dispersed,the dust concentration was measured using the filter membrane-weighed method and the particle sizes of the dust were measured by the microscope method.The sample photos were taken by digital camera and further processed by image-processing software for the count,but these two methods were improved in the experiment.The distribution laws of concentration and particle size of the dust were obtained by summarizing and analyzing the data.
Abstract: The potential of hexachlorobenzen(HCB),one of POPs,decomposition by ultrasonic irradiation and its combination with other AOPs(advanced chemical oxidation processes) and surfactant addition was evaluated.Comparing the ultrasonic irradiation alone with the combination with the UV(ultraviolet) light irradiation,the degradation ratios were almost the same,40.0% and 39.7%,respectively.On the other hand,the degradation ratio increased to 49.4% when combining with photocatalysis possibly attributed to the promotion of the cavitation due to the addition of TiO2 particles.When the surfactant concentration was increased to 0.1%,the degradation ratio increased to 49.2%.It seemed that the added surfactant could contribute to desorbing HCB from the sediment surface and increasing the effective reaction surface area.The degradation ratio of HCB under the dual-frequency ultrasonic irradiation was higher than that under the mono-frequency ultrasonic irradiation.After 1 h ultrasonic irradiation,the degradation ratio was 57.5% for the dual-frequency ultrasound of 20/176 kHz combination,whereas 3.67% and 41.0% for 20 and 176 kHz ultrasound,respectively.
Abstract: This study was concentrated on the Flue Gas Desulfurization(FGD) by waste water from converter.A continuous experiment was carried out to find out the rule of pH,[Fe2+],and FGD ratio with time.The dissolution ratio of FeO was also tested.Through the simulation experiment,it was found that at the condition of controlling the waste water updating ratio with 4%·min-1,a sustainable pH with 5~6.5 can be gotten.The FGD ratio can surpass 90% together with stable Fe2+ concentration and pH by controlling some of the important factors to proper values.The results of this study set a sound base for the industrial study on this topic.
Abstract: The method to control diffusion of indoor perfume pollutants in building was studied.Production source and diffusion characteristic of perfume pollutants were discussed.The control plan was proposed that pollution sources were isolated separately and then pollutants were collected.The exhaust system was designed.The optimal flow velocity in pipeline was obtained to be 5.6-6.0 m·s-1 based on numerical simulation.Test results proved that more than 90% of perfume pollutants were trapped and the method was an effective way to control the diffusion of perfume pollutants.
Abstract: The inhibition effects of di-(2-ethylhexyl)-sebacate on the corrosion behavior of reinforcing steel bar were investigated by electrochemical polarization curves and electrochemical impedance spectroscopy in simulated pore solution.The anodic reaction of steel electrode was suppressed.The content of Cl- is one of the most factors which effect the corrosion of rebars and the performance of the di-(2-ethylhexyl)-sebacate as corrosion inhibitor.It can suppress the electrochemical reaction by forming a deposition film in the steel/concrete interface.
Abstract: Based on the analysis of blasting smog-dust and its characters,the mathematical model of blasting smog-dust movement was established through mass flux,momentum flux,buoyancy flux and closed hypothesis.The shape of blasting smog-dust clouds in the states of impaction,mushroom cloud and diffusion movement was simulated on account of particle system.A program named BSMS was generated and the real-time simulation of blasting smog-dust movement was implemented.
Abstract: Three strains of bacteria which produce flocculating substances were isolated from activated sludge and soil.Every two strains of the bacteria among the 3 strains obtained above were selected to mix ferment by orthogonal experiment.The results showed that the combination of two strains called LH possessed the best flocculating activity.Identified on the base of 16SrRNA gene sequence,the two strains were pertained to Micrococcus sp.and Paenibacillus velaei.Though the preliminary study of the MBF-LH,it had been confirmed that MBF-LH is a kind of extracellular biopolymer and has a good thermostabilization.The best carbon source,optimal cultural temperature,initial pH value and rate of rotary shaker were saccharose,30℃,pH 8 and 120 r/min.Addition of KCl,CaSO4 and K2HPO4 to the culture medium could obviously increase the flocculating rate.When applied to the wastewater treatment,MBF-LH had some good properties such as low dosage and high efficiency.
Abstract: In this paper,based on Guanghua Road Station geometric materials,the numerical simulation of the station under five different excavation orders was carried out by FLAC3D software.Through the comparisons of different excavation orders with the same support parameters and the same loading condition,the regularities of soil-stress,plastic region and displacement transformation about the station were put forward.After analyzing,the recommending excavating order of the multi-tunneling construction was proposed.The results showed:(1) the plastic regions mainly exist in the areas between different holes,and along the line which presents 45° from the vertical direction of the middle hole;(2) the horizontal expansion of the section of the middle hole plays an important role in the downward displacement of the ground surface,but to the multi-tunnel construction,excavating the left and right hole firstly can reduce the displacement effectively;(3) the arch structure of the main hole plays an very important role in reducing the downward displacement of the ground surface.
Abstract: Adopting the parameters measure equipment for CH4 adsorption of coal,the effects of moisture and temperature to CH4 adsorption of coal were studied.The results have important meaning to perfecting indirect methods for measuring the gas quantity absorbed in coal.Using four coal samples at different metamorphic stages,isothermal adsorption experiments at dryness and different moistures were carried out.The fit precision of Langmuir adsorption model is best.The emendation equation for moisture effects on adsorption was gained.The results of isothermal adsorption experiment at different temperatures showed that the adsorptive capacity of coal decreases with increasing temperature,but the change is not obvious.The emendation equation and its relative error for measuring the gas quantity of coal at laboratory were gained.
Abstract: After the road in the test mine was sprayed with dust suppressant,the instantaneous road dust raising concentration behind the running truck,the particle-size distribution,and water content of the road surface dust were measured every day.On the tenth day,the instantaneous road dust raising concentration was 4.9 mg/m3,and the dedusting efficiency was 98.4%.Compared with the measure of spraying water,the measure of spraying dust suppressant on the road not only saved 98% water but also reduced the 31% cost of dedusting.
Abstract: Ca(OH)2 and seven kinds of dust from the iron and steel enterprise were used to produce desulfurizers through different methods.These desulfurizers were tested in a fluidized bed reactor in the laboratory.Duration of over 95% desulfurization efficiency and the calcium utilization ratio were measured for different desulfurizers.The experimental results showed that the desulfurizer in which the Ca(OH)2 and dust A(as additive) were mixed and then baked at a high temperature,could effectively improve desulfurization efficiency.The calcium utilization ratio could be increased from 18.2% to 70.2% and duration of over 95% desulfurization efficiency could be kept from 11 to 31 min.It proved that the desulfurizer produced by the above-mentioned method could efficiently improve the calcium utilization ratio.This demonstrates that the practical utilization of this desulfurizer for sintering gas desulfurization has great potential.
Abstract: Based on probing experiments,three psychrotrophses culture mediums were discovered and utilized to culture bacilli,actinomyces,and mildew,respectively.Cultured pschrotrophses were separated and purified at 6℃.The physio-characteristics of psychrotrophses were identified and their nitration abilities were inspected by considering effects of pH and temperature.A best growth of psychrotrophses was detected when the pH value was in the range of 7 to 8.Biology fluorescence chromatography spectrum test indicates that all psychrotrophses present the maximal activity at 15℃,still have definite activity at 0℃,and lose natural metabolizing ability at above 35℃.Under the conditions of 6℃ and psychrotrophses dosage of 5.0%,the ammonia-nitrogen removal efficiencies of the three psychrotrophses are 57.7%,59.0%,and 58.7% respectively.If a mixture of psychrotrophses is applied under the same condition,the ammonia-nitrogen removal efficiency increases to 67.2%.
Abstract: The adsoption removal of Cr(Ⅵ) in aqueous solution and the adsorption isotherm and adsoption mechanism were studied with C21H38NBr modified clinoptilolite used as a water treatment material.The result showed that after 30 min adsorption treatment at 25℃,the removal rate of Cr(Ⅵ) in aqueous solution surpassed 93% under treatment conditions of modified clinoptilolite particle size of 0.25-0.38 mm,clinoptilolite concentration of 30 g·L-1 at the initial pH=6.The adsorption of Cr(Ⅵ) to modified clinoptilolite could be expressed with Langmiur adsorption isotherm.The saturated adsorption amount of Cr(Ⅵ) reached 36.78 mg per 100 g with modified clinoptilolite.By comparing the XRD spectra of the modified clinoptilolite and the unmodified clinoptilolite,C21H38NBr could be found in the modified clinoptilolite.IR analysis indicated that the adsorption removal of Cr(Ⅵ) by modified clinoptilolite was the function of C21H38NBr in the modified clinoptilolite.
Abstract: Strain analysis was performed to the cross sections of prestressed concrete beams with straight line unbonded tendons.Based on the strain distribution calculation of the compression concrete fiber in ultimate state,the concrete strain at the location of the unbonded tendons was integrated to establish an equation group to calculate the ultimate stress increment.A computer program was assembled to solve the equations.To verify the accuracy of the computational method,21 specimens with straight line unbonded tendons were tested to failure by two concentrated loads at 1/3 span.Comparison indicates that the calculated ultimate stress increment had shown excellent consistency with the tested results.When the strain in the elastic area of the beam was neglected,the ultimate stress increment decreased 7.5 to 15.1 MPa,accounting for only 1.9% to 4.5% of the total stress increment,which indicates that the strain in elastic area can be safely neglected.Based on the theoretical and experimental research,the unbonded tendons of the prestressed concrete box-girders in Sandaohu middle bridge were designed.
Abstract: In order to find some possible methods to collect aerosol particles in steel making process,the particles of EAF dust were analyzed.The aerosol coagulation experiment of ZnO particles which were generated from the oxidation of Zn vapor was carried out and the coagulation phenomenon was observed.Furthermore,the aerosol coagulation in an agitated vessel was studied.By using incense aerosols,experiments under different agitation speeds were conducted.Experimental results were compared with theoretical calculation and the values of the coagulation coefficient of shear coagulation were obtained.An aerosol coagulation model considering the interaction effect between particles was applied to estimating the Hamaker constant.This result shows that the model can be applied to the aerosol coagulation under agitation condition to consider the interaction of particles.
Abstract: Smelting process is an effective way to treat industrial dust and fly ashes nowadays.In order to effectively control the remove and recovery of heavy metals such as Zn,Pb by smelting process,the vaporization behaviors from FeO-CaO-SiO2-Al2O3-Fe2O3 slag system with Cl were analyzed and compared in this study.Firstly,thermodynamic prediction on the possible vapor species of Zn and Pb in molten slag was carried out,together with the effect of some factors such as temperature,slag compositions and oxygen potential.And then related experimental study was performed.Finally the various technical measures and optimized parameters for enhancing the volatile efficiency of zinc and lead were determined.
Abstract: According to the specific geology conditions,the acoustic emission test was carried out on the rock to determine the time series characteristic of adjoining rock in mine.The critical acoustic emission parameters of rock breakage were analyzed and the breakage principle and characteristic of the acoustic emission signals were studied.Comparing tests were individually carried out on homogeneous specimens and specimens with cracks.Under the influence of crack,the regularity of acoustic emission signal of the specimens was generalized.Finally,the process of damage,failure and AE of rocks were simulated by Particle Flow Code which is based on the theory of Distinct Element Method according to variable strength and homogeneity.The inner impair of rock was simulated through reducing the rigidity of contact surfaces and the breakage of rock was studied by different simulation conditions.The conclusions will open a new way to study the acoustic emission regulation of impaired rock.
Abstract: The effect of deformation in austenite region and tempering temperature on microstructure and mechanical properties of SPV490 steel was studied.In direct quenching and tempering process,strength of samples was remarkably increased when adopting control rolling in austenite recrystallized zone,while impact toughness was decreased.With 44% deformation in recrystallized zone for two-phase rolling,because fine microstructure transformed from austenite with deformed band and high dislocation density was achieved,samples had good mechanical properties.
Abstract: Number controlled polystyrene(PS) opals were self-assembled 3D photonic crystal(PC).B2O3-P2O5-SiO2(BPS) inverse opals were fabricated by capillary force infiltrating BPS and selecting removing the PS ball.Absorption and transmission spectrum indicated that photonic band gap(PBG) was blue shifted obviously.XRD shows that the BPO4 crystal phase was increased with the temperature increasing,which might change the dielectric constant and should be paid attention for the PC usage.
Abstract: The structure and cycle behavior of Li[Ni1/3Li1/9Mn5/9]O2 were studied by means of XRD,SAED and synchrotron X-ray diffraction,respectively.The results show that Li[Ni1/3Li1/9Mn5/9]O2 can be indexed based on the α-NaFeO2 single phase and confirmed to be in good agreement with $\sqrt 3 $ahex.×$\sqrt 3 $ahex.×chex.superstructure.When the cell was charged to 3.8 V with lithium de-intercalation,the electrostatic repulsion between adjacent oxygen layers gradually increased and became largest near 3.8 V.At 4.6 V the rapid decrease of lattice constant c revealed that the most of the Li+ extracted from the Li-layer,accompanying with the oxidation of Ni2+ ions.When the charge voltage located between 4.6 and 4.8 V,c axis increased while a axis remained almost constant.The fact suggested that some Li+ de-intercalated from the transition metal layer,but the transition metal oxidation states did not change at 4.6-4.8 V.
Abstract: Monodisperse iron nanoparticles were prepared by thermal decomposition of iron carbonyl at low temperatures of 160-180℃ in kerosene.The synthesized iron nanoparticles were spherical and their average size decreased from 11.2 to 8.6 nm as increasing the initial concentration of iron carbonyl from 0.296 to 0.444 mol/L.The synthesized iron nanoparticles are amorphous,but the surface of the particles is easily oxidized and is spinel structure iron oxide by HRTEM.
Abstract: The factors influencing the stability of anion emulsions such as the ratios and contents of anion emulsification have been investigated.The factors affecting the stability of the no-ionic emulsions,such as the value of HLB(Hydrophile Lipophile Balance) and the contents of emulsification,have also been covered.It is found that the emulsification ratios and the value of HLB dramatically affect the stability of emulsified oil and emulsion.By researching the effects of different stabilities and different concentrations of emulsion on the absorption and friction coefficient,it is established that good lubricating performances can be obtained when the stability of emulsion is in the certain level.It has also been found in the experiment of cold rolling process that the proper stability and appropriate concentrations should be introduced based on the demands of the cold rolling process,so that the process works normally.
Abstract: The metal surface was treated with phosphating treatment,and the mechanics performance of the adhesive/metal interface was tested.The influence of fatigue loading on the adhesive joint before and after surface treatment was analyzed,and the changes of chemical bond before and after fatigue were analyzed,too.The results showed that after the phosphating treatment,the anti-fatigue performance of the adhesive joint became better.
Abstract: The electrical performance of environmentally protective insulating coating for non-oriented electrical steel was studied.H2O,Al(H2PO4)3 and St-BA emulsion are the principal raw materials of the coating.The experimental results of SEM,energy spectrum,XRD,salt spray testing,rigidity and adhesive force testing show that the best mixture ratio of insulating coating for electrical steel is H2O:Al(H2PO4)3:St-BA emulsion=25:10:5.Under this condition the interlamination resistance of the electrical steel is basically more than 500(Ω·mm2)/piece,and the performances of the adhesive force and corrosion potential are fine.It is demonstrated that phosphating and environmentally protective coating is an excellent insulating coating for electrical steel.
Abstract: The bionic bioactive artificial cartilage/bone composites implants were prepared by casting bioactive hydrogels onto the cancellous bone according to the structures of nature cartilage.This new kind of cartilage implants could improve the inferior connection of the implants with host cartilage by means of bone-bone interfacial interaction.The digital speckle correlation method was used to investigate the bio-mechanical properties of the artificial cartilage/bone composites.The micro-deformation of the cancellous bone,PVA/bonecomposites and PVA-BG/composite under different compressed loads were compared,which could show the cushion action of the artificial cartilage in the range of microscale.
Abstract: The influence of annealing temperature on microstructures and mechanical properties of the 25Mn-3Si-3Al-TWIP steel was studied in this paper.The results showed that the steel had better comprehensive mechanical properties when the annealing temperature was 1 000℃.The tensile strength of the steel is about 640 MPa and the yield strength is higher than 255 MPa,while the elongation is above 82%.The microstructure is composed austenitic matrix and annealed twins at room temperature,at the same time,a significant amount of annealed twins and stacking faults are observed by TEM.Mechanical twins play a dominant role during deformation and result in excellent mechanical properties.
Abstract: Well-aligned zinc oxide nanorods with different morphologies were fabricated on silicon substrates via a simple thermal evaporation method.The field emission measurements of these ZnO arrays show that the emission instability was mainly caused by the non-uniformity of emission tips in the arrays.DC ageing process was adopted and found that it was an effective way to improve the emission stability.The morphology of ZnO arrays has also effected obviously on the field emission property,and the optimized morphology exhibits better field emission property.
Abstract: A new type of thin copper cooling stave was developed in order to reduce the copper consume,depress the price of the single copper cooling stave and assure the cooling effect of the BF in the meantime.The thermal test system was designed as stimulation experiment to determine the cooling performance of the new thin copper cooling stave.The hot and cold surface temperature of the copper cooling stave are respectively 72℃ and 135℃ when the furnace temperature is 1 200℃ and no slag is on the hot surface.There is no large temperature difference between the hot and cold surface of the cooling stave when the thermal shock comes.Expediting the flow of the cooling water has no large influence on the reducing the temperature of the cooling stave.The heat flux of the cooling stave reduces sharply when slag is on the hot surface and the temperature of the hot surface of the cooling stave changes less as the furnace temperature moves.It is found in the experiment that the temperature distribution and heat flux of thin copper cooling stave match the production requirement of the BF.
Abstract: The blowing behaviors of a refining ladle were studied with purging plug at different positions.The flow field of molten steel in the ladle after argon blowing was calculated by a multiphase flow model and multiple regression,and the best position of the purging plug was obtained.The results indicated that the mixing effect of argon blowing on molten steel changed greatly with the position of the purging plug at the bottom of the ladle.The molten steel was mixed uniformly by argon bubbling when the distance between the position of the purging plug and the center of the ladle bottom was 0.44R0-0.48R0.
Abstract: In order to improve the capability of strip edge drop control in 1420TCM and develop strip productions such as DI tinplate which demands high quality of edge drop,the special work roll profile and design method were developed,and the parameters of target curve for automatic flatness control in stand 1 were also adjusted.The experimental results show that the capability of edge drop control is improved in 1420TCM.
Abstract: The characterization of tensile-bend deformation was the core of tension leveling technology and the essence of tensile-bend deformation was cyclic repeated bend of steel strip with tension.The tension leveling simulation model,which could simulate cyclic reserved bend of steel strip with tension,was established.The mechanism of strip plastic extension and flatness leveling was discovered by the results of simulation and analysis,and the application schedule of tension leveling technology was put forward.
Abstract: The research methods and distributions of strip transverse temperature were analyzed.The strip transverse temperature was measured on the outer of the No.7 stand of 1800 mm finishing rolling group.To attain the typical distribution of the transverse temperature,the described parameters were proposed.The distribution characteristic and the relationship among temperature distribution,strip width and longitudinal temperature were studied with these parameters,and these provided the reference for building the control model of hot strip transverse temperature.
Abstract: The nonlinear characteristics of the lateral vibration of a rub-impact Jeffcott rotor were investigated.Based on the theory of phase space reconstruction,the estimations of the embedding delay and dimension were studied,and the reconstructions of the bifurcation and chaos of the rubbing rotor were completed according to the results of numerical simulation.Then the correlation dimensions of the bifurcation and chaos were estimated.
Abstract: The rolling force of rolling zone were completely and systematically analyzed by using FEM.Based on these researches,the cause and the affection of contact force of non-rolling zone were found out.The researches were benefit to understanding of the forming mechanism,rotating conditions and eccentric limit of cross wedge rolling of parts with eccentric section.
Abstract: A new type unsymmetric gear pump with double pressure angles was studied.New formulas for the instantaneous flow and flow pulsation were put out.Compared with symmetric gear pump,the formulas showed that the unsymmetric gear pump could efficiently improve flow pulsation with the rise of instantaneous flow.It is concluded that the sliding coefficient of unsymmetric gear pump was smaller than that of symmetric gear pump.The increase of pressure angle of work side would cause an evident increase in the minimum oil-film thickness and in the specific ratio of oil-film thickness,which is helpful to improve the lubricant characteristics of gear teeth surface.The practical significance of the present gear is demonstrated by the computer simulation with MATLAB software,such predictions can provides the firm basis for the further engineering application of this new-type gear pump with unsymmetric teeth and double pressure angles.
Abstract: A new concept,incompletion distributed complete compliant mechanism,was proposed.The compliance of incompletion distributed complete compliant mechanism,the third complete compliant mechanism,is between those of lumped compliant mechanism and distributed complete compliant mechanisms.In order to classify the complete compliant mechanism,a new concept,character dimension ratio,was also given.According the characteristic of the third complete compliant mechanism,the deflection of link was taken into account when complete compliant mechanism was analyzed with pseudo-rigid-body model.Finally,the calculation of an example was given and the result indicates that the method is validity.
Abstract: There are many influence factors of designing multi-wedge die.In this paper,the actual spread span of interior wedge and interface angle were studied by experiment and finite element analysis.Meanwhile,a new optimization design method for multi-wedge die was developed.The paper suggests that an effective strain is a standard of judging uniform deformation within multi-wedge rolling.The optimal parameters for the design of railway axles die were obtained.The results have an instructional action for designing multi-wedge die.
Abstract: Some factors affecting single chamber direct microbial fuel cell performance such as iron concentration in the cathode electrode,substrates in anode chamber,substrate concentration and anode electrode area were studied with a single chamber direct microbial fuel cell.It was proved that the load voltage increased with the Fe3+ concentration increasing under the same conditions.Electricity was enhanced as more electrons and protons were released during anode chamber reaction for the different substrates.The load voltage was also grown with the increase of the substrate concentration,but the saturation value of the substrate concentration was 0.72 g·L-1.The more Rhodoferax ferrireducens absorbed on the surface anode electrodes to transport the more electrons,and the load voltage was not multiple of the number of anode electrode.This study provided scientific base for the application of the single chamber direct microbial fuel cell.
Abstract: Denial-of-Service(DoS) attacks are the main puzzles in the security of Ad Hoc network.A novel agent-based security routing protocol scheme was proposed to block DoS attacks.Agent can update itself at some interval by the trustworthiness of the neighbor nodes to fit the Ad Hoc distributed routing computing environment.It can efficiently improve trustworthiness and decrease computing complexity.Agent security specifications were extracted by the feature of the attacks.NS2 simulator is expanded to validate the security routing protocol.Simulation results show that agent-based security scheme is highly effective to detect and block DoS attacks.
Abstract: Attribute of a proposition includes structure attribute and value attribute.The structure of a proposition determines the truth value of the proposition,the relationship between the propositions,and the logic calculation result.The truth value of the proposition is only a value attribute determined by the structure of a proposition,it cannot stand for the whole proposition.And logic calculation is the calculation between the propositions,not the calculation between the truth values.In the many-valued logic,proposition logic calculation result is decided by the relationship of propositions.The different propositions with the same truth value would not always have the same logic calculation result.Logic calculation is not always homomorphic with a certain operator or a group of operators(the functions of truth value).Sometimes,the truth value of composite proposition cannot be fully determined by the truth values of the member propositions.Therefore,the conjunction of the many-valued logic cannot always be defined by the form of the functions of truth value(operators).The proposition formula in many-valued logic cannot be considered as the function of the truth value.The proposition formula is the function of proposition.
Abstract: The structure and effect of the computer control system for Rizhao Iron and Steel Co.1 580 mm hot strip mill were introduced.Lots of advanced function,such as the auto-width control(AWC) and short stroke control(SSC) for edger mill,the auto gauge control(AGC) for rougher and finisher mill,the coiling control and mandrel transfer for the newest generation hot strip coilbox,the hydraulic looper control system,auto shape control system,coiling temperature control(CTC) system,auto jump control(AJC) for wrapper rolls,were developed.The quality and performance of product line were highly improved.Simultaneously level 2.5(production control) system with slab depot,coil depot and grind house manage function was also provided.So the production organization and factory manage could be assured.
Abstract: One motor condition recognition system based on multi-agent decision fusion was proposed.Six classifiers were used to classify motors condition by system inputs:vibration and current signals.In the system,each classifier was considered as an agent,which independently completed recognition task,then exchanged information among classifiers to improve classification accuracy.Sensor fusion and classifier selection were put into the system,and this method was much better than one-single signal and no classifier selection.The best recognition result of the proposed system achieved 98.9%.
Abstract: In allusion to all kinds of Autorun virus which is most popular at present,the Autorun virus's structure and auto-run conditions were sufficiently studied.Autorun virus startup mechanism was analyzed.Recovery methods,such as edit group strategy,edit register table,forbidding auto reading and executing,and preventing virus executable files created in root directory were brought forward.Furthermore,an effective virus-killed method was offered.
Abstract: Unimodal biometric systems have to contend with a variety of problems and sometimes cannot satisfy application requirements.In this paper,a novel method of multimodal recognition using frontal face and ear was proposed.Kernel Fisher Discriminant Analysis was used for ear recognition,face recognition and the multimodal recognition.The multimodal recognition was studied on the image level fusion and feature level fusion.The experimental results from using USTB ear database and ORL face database show that the multimodal recognition outperforms the unimodal biometric recognition.This work shows that multibiometric system can increase the accuracy of overall system recognition,and provides an effective approach of non-intrusive biometric recognition.
Abstract: Knowledge acquisition technique gives constrains to study and application of knowledge system,therefore,effective extraction of domain knowledge from text becomes the major approach to knowledge acquisition.Domain knowledge acquisition technique based on theories of ontology and graph analysis is proposed,data structure of ontology,instantiation of ontology concept and construction of semantic field are discussed.Frame of text knowledge acquisition system is constructed,which is of general applicability,and the prototype system has been realized.By experimental verification of domain knowledge acquisition in Traditional Chinese Medicine,the system achieved good results.
Abstract: The immune network model of Varela is the second generation network model following the Jerne's.The dynamic balance relation of T and B cells without antigen effect is described in Varela immune network model.An improved Varela's immune network model considering antigen base on Varela's immune network model was founded.Some biologic characteristics can be described by the improved Varela's immune network model to a certain extent.Then an immune controller model was constructed on base of the improvement Varela's immune network model that is independent of system object model.With a big lag model as the controlled plant,the characteristic of the immune controller was studied with simulation.The result indicates that the controller has the memory,self-learning ability,the good anti-delay and self-adapting performance.The influence of controller parameter change on the control system performance was also studied with simulation.
Abstract: Based on the thoughts of system analysis,multi-objective,integrated,and dynamic optimization principle about main technology indexes in nonferrous metal mines was put forward,and the concrete optimization method was introduced.Bases on the background of a gold-copper mine,the series technology indexes of the mine were systematically optimized.The results showed that a better economic benefit and ore resources development effect could be obtained under current production technology and market environment if the optimum indexes were applied.
Abstract: In order to investigate the interaction between environmental chemicals and estrogen receptors,the ligand binding domain of human estrogen receptor β(hERβ-LBD) was expressed in Escherichia coli.Based on the optimized expression conditions(IPTG,0.2 mmol·L-1;culture temperature,25℃;time of induction,8 h),after purified by affinity chromatography,the production of hERβ-LBD can be reached to 236 mg·L-1.
Abstract: A sulfur-oxidizing bacterial strain was isolated from sewage sludge using liquid selective medium and then purified on solid selective medium.The bacteriam can metabolize sofur or S2O32- to SO42- during growth.The sulfur-oxidizing strain is Gram-negative,and has ability to swim.After three days of cultivation,the results showed that the pH of medium decreased.After one week,the pH of the medium dropped to about 0.6,which suggests sulfur oxidizion is taken place.The concentration of the sulfate was tested by using ion chromatography,and the results showed that the concentration of the sulfate increased from 249.2 mg·L-1 to 3 679.7 mg·L-1.The sulfur-oxidizing bacterium was then inoculated into the FeS medium,as expected,the FeS was oxidized and the media became lighter in color.
Abstract: To increase the activity of nicotinic acid hydroxylase of Pseudomonas sp.BK-1,the culture conditions of the strain were optimized.The experimental results show that 10 g·L-1 sucrose is the optimal carbon source and 20 g·L-1 corn steep liquor is the optimal nitrogen source.The optimized concentration of the inducer nicotinic acid is 12.5 g·L-1 and initial pH of culture medium is 7.0.Under the conditions of rotation 400 r/min and ventilate 4.2 L/min the highest enzyme activity of this strain can reach 1.47 U·mL-1 at 16 h in a 5 liter fermentor.The accumulation of 6-hydroxynicotinic acid in reaction mixture by Pseudomonas sp.BK-1 can reach 154 g·L-1 at 36 h.
Abstract: A strain of salt-tolerant bacteria was isolated from the soil of campus lawn and the salt tolerance of the strain was up to 20% NaCl.The results of the analysis of morphology,physiological characteristics and 16SrDNA sequence showed that the strain was a bacterium of the genus of Bacillus.The 16SrDNA sequence was registered in GenBank and the accession number was EU167738.
Abstract: The strain of Rhodococcus rhodochrous tg1-A6 with high activity of nitrilase was used to convert 3-cyanopyridine to nicotinic acid.By using resting cells,the optimum substrate concentration was 130 mmol/L,and the optimized temperature and pH were 55℃ and 7.0,respectively.Under the optimal conditions,100% of the added 3-cyanopyridine could be converted,and the highest concentration of nicotinic acid in reaction mixture achieved 165.2 g/L at 15 h.In case of higher yield,the resting cells could be reused for seven batches catalyzing(total 67 h),and the summed yield of nicotinic acid could reach 529 g/L.
Abstract: For the given water treatment,the features of the microbiological colonies before and after the addition of the 2-methylisoborneol(2-MIB) were studied,and a method for isolation of a bacterium capable of removing the 2-MIB from the water was proposed.The procedure of the method was as follows:the activated carbon,whose surface was covered by a mature microbiological membrane,was employed to continually treat the water with higher concentration of 2-MIB,and then the sample gained from the surface of the activated carbon was cultivated in the mineral salt liquid culture in which 2-MIB was the only carbon source;finally,one strain,which was identified as Pseudomonas spp.based on the data of 16S rRNA analysis,was isolated by plate streaks.
Monthly, started in 1955 Supervising institution：Ministry of Education Sponsoring Institution：University of Science and Technology Beijing Editorial office：Editorial Department of Chinese Journal of Engineering Publisher：Science Press Chairperson：Ren-shu Yang Editor-in-Chief：Ai-xiang Wu ISSN 2095-9389CN 2095-9389
