Abstract:

Abstract:

Abstract: The aetivated earbon derived from the residue of desilicieation riee husk was used as the potentiaadsorbent for the adsorplion of indigo from the wastewater. E’xperiments were eondueted to study the laetors affecting the adsorption proeess such as the contaet time the dosage of adsorbent and the initial pH. The equilib.rium data agreed well with the Koble-Corrigan isotherm model. The adsorption proeess was spontaneous andendothermie process. The pseudo-first order model, pseudo-seeond order model and intrapartiele model wereused to deseribe the kinetie data. The dynamie data fitted the pseudo-second orler model well which suggestedthat the adsorption might be a chemisorption proeess. Aeeording to the evaluation with the Langmuir equationthe maximum adsorption capacities of indigo dye onto activated carbon was 1. 05 mmol . g-’. lt shows that theaetivated earbon derived from the residue of desilicieation riee husk has a good adsorplion performanee for theindigo dye and can be used as adsorbent to treat the wastewater with high quality.

Abstract: The conservaney agent for historical bricks was prepared by using (3-glycidyloxypropyl) methyldie.thoxysilane, (3-aminopropyl) triethoxysilane, water, and HCl as reactants. The elfeet of reaetive formula oncure time and membrane performanee was investigated and the optimum fomula V( KH560 ): V(KH550 ): (H,0)=10: 1: 2.4,196 HCl) was obtained. The conservaney performanee of the oplimum formula was valuedon unearthened fragments of brick reliels. Through the comparision of some performanee parameter such as waterabsorplion, salt absorplion, thaw-freeze eycle, and salt resistanee before and after conservalion, it was foundthat the porousness and hydrophilieity of the bricks were still maintained and the thaw-freeze cyele and salt re.sistanee inereased about 2 times, meanwhile the strength and weather resistanee were enhaneed signifieanlly.

Abstract: ANSYS Workbeneh is applied to the oplimization study on phase-change heat transler of plate heatexchanger with dimples. And the influenee of p, R, H,and P on thermal-hydraulic performanee is exploredwith Nu and fserving as the objective funetion. Results show that the volume fraetion of water vapor in thedimples is signifieantly higher than that on the plate near the dimples, which proves that the plate with dimpleshas the very good strengthening effeet on phase-change heat transfer; and, within the seope of the study ,thesensitivity of Nu and fon input parameters is basically the same , with a rank of o > R>H, >P, and the opli-mal struclure parameters is 7 mm

Abstract: In this study, Clostridium sp. Fanp2, as bio-hydrogen production baeterial souree, was achievedfrom cow dung eompost. The capability of hydrogen produetion was investigated in small batch reactors, 5 land 30 l reaetors from prelreatment com straw. Then, the kineties of hydrogen produetion from corn straw wasstudied about small bateh ferentation reaetor and 5 L, 30 l reaetors. The experimental data of kineties of hy.drogen produetion was in agreement with the modified Gompertz equation, then the kineties model of comstraw’s hydrogen produetion in the batch reaetor and 5 L, 30 l, reaetors were established and the kineties olhydrogen produetion parameters was determined. And the kineties model were analyzed with mathematical sta.listies method. The ealeulation resuls show that the assoeiation degree greater than 0.99, respeetively. So thekinetie equation was reliable.

Abstract: Phase composition and mierostructure of SiC heating elements used in N2 atmosphere have been analyzed by XRD and SEM, and the damnification mechanism of SiC heating elements is discussed. The resultsshow: there are many pores in unchanged part which provide channels for the corrosive gas leading to damnifi-cation, and the impurities Si, K2O and FeSi would accelerate damnification during use ; a protective film inthe surface of SiC cannot fom in N2 atmosphere due to low pressure of O2,and the trace O2, in N2 atmospherereaets with SiC leading to structure loosing which inereases oxidizing damage; Al(g), Al2O(g)and CO(g)firom refraetories containing Al, Si and C reaet with SiC to form β-SiC and Al2O3, which leads to damage.

Abstract: Phase eomposition and mierostruelure of SiC heating elements used in N, almosphere have been an-alyzed by XRD and SEM, and the damnifieation mechanism of Sic heating elements is diseussed. The resultsshow ; there are many pores in unchanged part which provide channels for the corrosive gas leading to damnif.eation , and the impurities Si, K,0 and FeSi would aeeelerate damnifieation during use ; a protective film inthe surfaee of SiC cannot form in N, almosphere due to low pressure of 0,,and the trace 0, in N, atmospherereacts with SiC leading to structure loosing which inereases oxidizing damage; Al(g), Al,0(g) and CO(g)from refraetories eontaining Al, Si and C reaet with SiC to form B-SiC and Al,0,, which leads to damage.

Abstract: Ethyl levulinate was prepared by USY as solid aeid eatalyst from eellulose in ethanol. The effeets oldifferent parameters such as liquid -solid ratio, reaetion temperalure, eatalyst dosage, reaetion time and waterdosage on ethyl levulinate yield and mass of diethy ether and solid residue were also studied. And the influ.enee of eatalyst reuse eyele on elhyl levulinate yield was further investigated. Experimental results showed thatthe highest yield of ethyl levulinate was 14.95 mol96 under the following conditions: liquid-solid ratio 15, re.aetion temperature 220 ℃ , eatalyst dosage 2. 596 , reaction time 2 h and water dosage 0. lt was found that thereeovered eatalyst still remained high catalytie aetivity afer being reused for five times.

Abstract: This paper prepared Al-Ti-C-Sr grain refiner by in - situ reaction with pure aluminum and K2TiF6 graphite powder, pure strontium. Orthogonal experiment was applied to oplimize the composition and preparation proeess of the Al-Ti-C-Sr reliner. The prepared Al-Ti-C-Sr refiner by oplimal scheme was extruded andthe mierostruelure and relining performanee were studied. The results show the oplimal scheme: compositionwas Al-3’Ti-0.2C-5Sr, K,TiF, and graphite powder were held 60 min, pure strontium was held 15 min. when Al-3Ti-0.20-5Sr was exlruded, the size of TiAl3, Al4Sr and Al-Ti-Sr phases decreases, and TiC phases distributed uniformly in the matrix. Afer adding extruded Al-3Ti-0.2C-5Sr in A356, the average grain size de.ereases from 1195 um to 350 ym, the seeondary dendrite arm spacing deereases from 23.2 um to 21.5 um.

Abstract: lntrodueing hydrophilie group onto polylaetie aeid ( PLA) by atom transfer radieal polymerizationwould faeilitate changing the hydrophobicity of PlA to amphipathy, in which progress maeromoleeular initiatorpreparation is the first step. The synthesis strategy of polylactie aeid maeromoleeular initiator ( PLA-Br) con.sisted of a two-step proeedure: ( i) degradation of high molecular weight PLA to about 8000 g/mol and molee-ular weight distribution about 1. 26 , followed by ( i) quantitative conversion of the PLA hydroxyl end-groupswith bromoisobutyryl bromide ( BlBB). The maeromoleeular parameters and struetures of PLA-Br were deter.mined by ’H-NMR spectroseopy and F’T-lR. Dependenees of conversion ratio of BlBB on the mole ratio olBIBB and PLA and the reaetion time were diseussed. The results showed that the highest esterilication rate olPLA was 79% as the mole ratio of BlBB and PLA 1: 2 and reaction time 24 h.

Abstract: The thermal performanee of sinusoidal-eorrugated solar air colleetors was studied by numerieal sim.ulation by using CF software, and the parallel and vertieal models were analyzed. When the flow is parallelto the corrugated plate, the heat exchanger between the plate and the air is fully with less heat loss, and theheat eollecting efficieney is improved by 4. 1696 than the vertieal model; when the llow is vertieal to the corru.gated plate , the outlet temperature is relatively low with larger heat loss and low elficieney because of the deacspace. The thermal performanee in the U type, X type, S type of the sinusoidal-corrugated solar air collectorwas also analyzed. Results show that type X is the best of three types with the highest outlet temperature, theminimum heat loss and pressure drop, and the average thermal ellicieney of collector can reach 83.54%.

Abstract: In order to improve the speclral efficieney of delay sensitivity of channel, we present a novel frame-work of changing the transmission parameters aeeording to the dynamie aecess mode. Based on the underlay-interweave hybrid aeeess mode, this framework is modeled as a optimization problem in which the primary andsecondary users adjust transmission parameters with the constraints of the elfeetive speetral elficieney of theprimary link, the average transmission power of the cognitive link, dual quality-of-serviee (00S)measures,namely, average packet error rates and time delay, constraints of both links, to maximize the elfeetive speelralelicieney of the cognilive user. The numerical results show that a better tradeolf ean be achieved between theproteelion of primary user and the elfeelive speelral elfieieney of cognitive system when the delay is introdueedand the constraint is salisfied.

Abstract: In view of the problem of the temporal redundaney in temporally-correlated MlMO channels, a newlimited feedback approach based on channel predietion is proposed in this paper. Both the temporal cohereneeof the adjaeent data frames and AR prediction model are used to prediet channel state information and find anoplimal eodeword which is utilized to get an integrated oplimal system performanee of data frames and feedbackit to sender. The simulation results show, while the system performanee of the feedback approach proposed hasdeereased compared with the traditional one, but the feedback costs are signifieantly redueed, so the performanee loss is acceplable.

Abstract: A face reeognition algorithm that eombines weighted wavelet deeomposilion with Fisherlaces is pres.ented. Firstly, the faee image preproeessing is condueted ater whitening pretreatment, in order to get rid olthe interferenee and noise, and to balance the energy speetrum of the image. Then wavelet decomposition isused to get the weighted combination of the low frequeney eomponent and the horizontal, verlieal high frequeney component. In combination with Fisheraees, applying the linear diseriminant analysis ( LDA ) into thespaee after the PCA transformation, we solved the problems that seattering matrix within the class is singularand PCA is not conducive to sample classifieation in dimensionality reduction process. Finally, the nearestneighbor classifier is used for the classification and reeognition. Through the experiment based on ORl andYALE face database, the wavelet basis and decomposilion level is determined to be db2 wavelet and 2 levels.and the best parameters of normalized size and feature dimension are chosen to make the recognition ratereached 98. 7596 and 10096 . The comparative experiment results show that the algorithm has better recogni.tion effeet with the feature dimension of 20 ~ 70.

Abstract: Based on the assumplon that the disance belween the souree iransmier and the lina receiver isnot infinite in distributed network , the elfeetive transmission distanee is redeined, the upper and lower boundsof the expeetation of elfeelive transmission distanee and the density of progress are derived, and how the net.work parameters affeet the density of progress is studied. Numerieal and simulation results show that; the simulation value for the expeetation of elfective transmission distanee is between its upper and lower bounds, anddeereases with the angle of the region for the seleetion of relay; the simulation value for the density of pro.gress , which is belween its upper and lower bounds, is closer to its upper bound, and the density of progress isdetermined by the expeetation of effeelive transmission distanee and the maximum probability of outage.

Abstract: For the resouree alloealion unair problem among the second users in cognilive radio, a resouree al.loeation algorithm based on the fairness of the second users rates is proposed, and it also makes the throughpulmaximum. The algorithm can be divided into two steps, cognitive user subearrier alloeation and subearrierpower alloeation. In the first step, two subearrier alloeation schemes are put forward, and those two schemesalloeate subearriers to cognitive users aeeording to their rates ratio. But, the differenee is that subearriers aredivided into two classes in the seeond scheme, and this scheme improves fairness among the users. In the see.ond step , water-filling algorithm is used to make the throughput maximum. The simulation results show the ef.fectiveness of the proposed algorithm.

Abstract: This paper studies the size of steel mesh lattiee, the radius of steel mesh and the thickness of wallin reinforeed eonerete wall on communieation signal altenuation by using the Finite Diferenee Time Domain(FDTD ). The resonant frequeney of reinforeed eonerete wall is diseussed by using the equivalent modelStudy results show the laws of the amplitude altenuation and the resonance frequeney distribution of the transmission coellicient when three parameters change, and resonant frequeneies of the reinforeed eonerele wall arein aeeordanee with the theorelical values ealeulated by using the equivalent model, which verifies the rationali.ty of the equivalent model.

Abstract: A quick aeeurate algorithm for relleetion points and diflraclion points in hybrid paths, as a ray-trae.ing technique, was put forward, for foreeasting station surrounding environment radiation field intensity. Witha general formula for mirror image points and image lines, an algorithm for rellection points in multihop pathswas presented. An oplimization formula for diflraction points in multiple diffraetion path algorithm was intro.duced. By proper transformation between relleetion and diflraetion in hybrid paths,the algorihm which trans.form hybrid paths into diffraction paths was implemented. Finally, the proposed algorithm was applied to im.prove the z-buffer algorithm , the ray propagation path was tracked and field strength was ealeulated in the sur.rounding environment around a communieation base station. The numerieal results from the algorithm are ingood agreement with the measured values.

Abstract: For the real-time monitoring and control of filament winding equipment in some chemieal fiber com.pany ’’s workshop, the winding equipment real-time monitoring and control system was designed and implemented by adopting the OPC communieation technology, C#f programming language based on the Mieroso NETplatform and $OL database technology in this paper. And the monitoring and control system was built based onRSLinx OPC Server and multiple PlC controllers in the field, the soltware struelure and database struelurewere given, the communieation between the Host computer solware based on C# programming language andthe OPC Server was implemented, the data processing, information mining and real-time decision-makingfunetions were eompleted. The praetieal applieation showed that the system could stably and elfeetively realizethe real-time monitoring and control to the workshop winding equipment.

Abstract: On the basis of PRlUS working modes and experiment research, a logie threshold control strategywas designed. Combined with the simulation model of the vehicle, the control performanee of the proposedeontrol strategy was studied. The speed charaeteristie, power performanee, battery SOC ( state of charge) andfuel consumption of the vehicle have been studied under the UDDS driving eyele. The simulation results showthat the control strategy based on logie threshold can realize rational switch in different operalion modes, thevehiele power performanee and fuel eeonomy can mateh with the vehiele experiment data, and this verilies thefeasibility of the whole-vehiele simulation model and the control strategy.

Abstract: Sunspots are non-linear, non-stationary, multi-seale changes time-series, and the observations wereofen interfered by noise. Aeeorling to the eomplexity of sunspots time-series prediction , first of all, this paperpreprocessed the original data through wavelet de-noising method, then the denoised signal was deeomposedinto several lMF components and remainder by EMD. In view of the charaeteristies of the low frequeney andhigh frequeney components, RBF neural network model and SVM model were used to prediet them respeetive.ly, the final predicted value would be got by adding each component’s result at last. The simulation resultsshow that this model has higher prediclion accuracy.

Abstract: ln this paper, a networked temperature control system wih the characteristies of cross-platform isdesigned and realized through the HORB based networked communieation platform. Firstly, HORB based net.worked communieation experimental platform is established. Seeondly, temperature conrol system of a mieroreactor proeess with peltier deviee is considered, where Advantech’s PCl812PG board is used to colleet tem.peralure and PCl1760U board to generate PWM wave. Also, the drivers of the Advantech’s boards are devel.oped for the nelworked system. Thirdly , the model output following controller based on CGT ( Command Generator ’Tracker) is designed for the networked temperalure control of miero-reaetor proeess. Then, the imple.mentation is diseussed using the designed platform and proposed method, where fault loealization, eooperativeeommunieation and distributed control are ensured. Simulation and experiment are given to show the elleetive.ness of the designed communication system and the proposed conlrol method.

Abstract: This paper proposes four single models, and they are regressive moving averag model, neural net.work model, support vector machine model and partiele swarm oplimization support vector machine model. Wemake use of the thought of non oplimal combination foreeast in operation research, linear combination, theweighted geometrie means combination and the weighted harmonie average portfolio 3 combinations of modelsand other rights law ,a simple weighted average method , the mean square error countdown Franee and entropy4 combinations model weights solving methods are used; Supported by some power company original load logdata and real-time meteorologieal data of some three day, numerieal example analyse and verily that proposedeombination foreeasting model has validity and aeeuraney when it’s used short-term load and it provide a refer.ence for the short-lerm load forecast.

Abstract: In order to investigate the elfeet of the deformation charaeteristies of partly-filled fracture on engi.neering stability, based on the experiment method of normal compression and lateral restraint, dynamie de.formation modulus of partly-filled fracture is researched. lt suggested that, the structure of filling medium be.gan to change owing to the elfeet of stress. The filling medium was smashed with the inerease of the stress. Atthe same time , the fracture spaee was filled with granules of medium till the spaee was full filled and the medi.um beeame dense. "The result is that deformation modulus had dynamie characteristies. The experimental re.sults showed that the deformation modulus of flled fracture inereases linearly with the inerease of stress, at thesame time , it has a high degree of reprodueibility. When the filled width is same, the deformation modulus olfilled fracture deereases with the deerease of the eonfiguration ratio of cement-sand. While the conliguration ra.tio of cement-sand is the same, the deformation modulus of filled fraclure inereases with the inerease of thefilled width.

Abstract: Anti-aging performanee of asphalt material is a key factor afecting the durability of asphalt pave-ment, simulating the aging test in laboratory is an important way to study the performanee of asphalt aging. lnorder to simulate the asphalt aging, rolling thin film oven testing, penetration testing, solening point test anadynamie shear rheometer test had been done and the test data is analyzed to diseuss how dillerent aging conditions alleet the perormanee of asphalt and asphalt aging mechanism. The results show that the extension of theaging lime, the improvement of asphalt aging temperature makes losses inerease, solening point and penetralion deerease , asphalt mixture fatigue resistanee deeline ; ageing lime and temperature changes can dramatieally change mobility of asphalt; when we inerease the shear rate, the rheologieal properties of asphalt index de.creased.

Abstract: Traditional stone houses in the Shidonggou village of Gaoshan in Xingyang city have a unique build.ing style. This paper takes the typieal traditional stone house as the object,understands the mechanism of thetypieal disease through the numerieal simulation method. The results show that the maximum out - of - planedeformation oeeurs in the middle and bottom part of the transversal wall, stones prolrude first with the longitudinal wall joint,leading to extrusion on the transversal wall:the horizontal displaeements of stone wall are different,with the largest shear stress, leading to cracks between the joint of longitudinal and transversal wall; thetransversal walls under the middle purlin have the largest stress when bearing the weight of the roof, easy toproduee loeal bearing cracks. The paper proposes reasonable treatment measures and provides technieal supporifor repair and safety of aseension to this slone houses.

Abstract: ln orler to clarily the inllueneing relationship of asphalt components and other factors on the viseos.ity, four - component analysis data and viseositly test data of ten asphalt binders were tested. Based on the greyincidenee analysis, the gray correlation degree sort results of asphaltene, aromaties, salurates , resin, totaconlent of resin and asphaltene ,the content ratio between resin and asphaltene and other factors on the viseosity at 135 9 and 100 ℃ were analyzed. The research results showed that satisfactory results can be golten whengrey ineidenee analysis was used in studying the inlluenee of asphalt components on the viseosity at 135 ℃C and100 C. For the viseosity at 135 ℃ , the grey relation sequenee of inlluenee factors is that resin conlent, aro-matie content, salurate content, tolal of resin and asphaltene, ratio between resin and asphaltene, and as.phaltene content. The sequenee data got by the grey relation degree theory show that the resin content is theprineipal inluenee factor for the viseosity at both temperature, while the asphaltene eontent has a minimum inluenee. The analysis showed that resin content and tolal of resin and asphaltene have important effeet on theviseosity with higher temperature in construction process and workability of asphalt binder.

Abstract: Anti-aging performanee of asphalt material is a key factor affecting the durability of asphalt pave.ment, simulating the aging test in laboratory is an important way to study the performanee of asphalt aging. lnorder to simulate the asphalt aging, rolling thin film oven testing, penetration testing, softening point test anddynamie shear rheometer test had been done and the test data is analyzed to diseuss how dillerent aging condilions affeet the performanee of asphalt and asphalt aging mechanism. The results show that the extension of thaging time, the improvement of asphalt aging temperature makes losses inerease, soltening point and penetration deerease, asphalt mixture fatigue resistance decline ; ageing time and temperature changes can dramatically change mobility of asphalt; when we inerease the shear rate, the rheologieal properlies of asphalt index deereased.

Abstract: Based on the projeet of the culvert under high embankment in the expressway from Kelan to Linx-ian, the vertieal earth pressure and the stress of the culvert areh ring are monitored by the field tests, and ae-eording to the monitoring results, the analysis on the distribution characteristies and variation laws are condue.ted. Meanwhile, in order to verily and study the monitoring results, a 3D finite differenee model has beenbuilt to obtain the stress and displaeement fields of the high fill embankment. The results show that. the stiffness dilflerenee belween the eulvert and the fill is the main reason of the coneentration of the vertical earthpressure on the top of culvert, and the coneentration faetor inereases signilieantly with the height of the fills inereasing at the early stage, then it remains stable; the maximum tensile stress is present to the vault of archeulvert, while the maximum compressive stress between the haunch and the skewback of the arch ring; in or.der to avoid eracking, it’s proposed that the arch ring should be reinforeed beeause of the high fill loading onthe top of eulvert; the slope ean share a part of the fill load, leading to the olfset load effeet to the structure olthe culvert, which must be noled when it is constructed near the slope.

Abstract: Considering the interfaeial slip and uplift between conerete llange and steel truss, a sixth linearhomogeneous differential equalion is derived to caleulate the uplifting foree of the simply supported eompositebeam under eoneentrated load. The boundary eonstraint equations of axial foree and uplifing foree are estab.lished,and both methods obtaining exaet and approximate solutions of the equations are proposed. Finally, anumerieal ealeulation of a simply supported composite beam is earried out to obtain the approximate solution olthe axial and uplifing forees using the proposed method.

Abstract: The mechanical elleets of rellective eracking prevention on rubber powder modilied asphalt stressabsorbing layer is caleulated and analyzed by ANSYS modeling. Then the stress elfeets of the various interlayerparameters are also diseussed. The results show that the stress absorbing layer of rubber modilfied asphalt canelleelively prevent relleelive eracking of asphalt layers paved on the old cement pavement, the stress conditionof the surfaee layer can be improved significantly by redueing modulus of the sress absorbing layer, and therelleetive eraeking could be redueed correspondingly. The author reeommends the reasonable modulus range ofthe rubber powder modified asphalt stress absorbing layer is 50 Mpa ~200 Mpa, and the reasonable thicknessis 0.5 cm~2.5 cm.

Abstract: The cooling proeess of unsteady temperalure field in the erew eapsule is simulated, making use oleomputational fluid dynamies software FLUEN’T and the algorihm of PBCS, in addition to RNGk - s two equa.tion model replaeed with the three-dimensional turbulenee model. And then the workflow is established, whichineludes numerieal simulation, approximate model and oplimization algorihm, "The numerieal simulation trainsapproximation model, using radial basis funetion ( RBF) neural network approximation model instead of thehigh eost of the simulation ealeulation. Multi-island GA is chosen to optimize the wind direetion. The wind direetion oplimized and the wind direelion vertieal surace of inlet tuyere are ealeulated by simulation software respeelively. Compared before and afler the optimization of heat flow value and temperature contours, front sealheat llow inereases by 11.98%6 after oplimization, rear seat heat flow inereases by 17.81% afler oplimizalionand the oplimized cooling area and cooling degree are improved.