Bi2O3-B2O3-SiO2 ternary microcrystalline sealing glass was synthesized by heat treatment of precursor powder obtained through sol-gel process.Alkaline-earth metal oxides(CaO,SrO,BaO)were doped to obtain quaternary sealing glass.Effects of two heat treatment temperature and holding time on the crystallization properties of these samples were studied.These samples were characterized by XRD、Raman and DSC,their reheat treatment temperature and soaking time have been investigated.The results indicated that all these systems showed new microcrystalline status.The doping system will increase their thermal expansion coefficient.The initial transformation temperatures(Tg)were low.
Urban heat island effect is closely related to urbanization and land use changes.The expansion of urban impervious surface has greatly changed the thermodynamic properties of the underlying surface,which is a major cause of urban heat island effect.The authors obtained the land use data in Wuhan city in 2002 and 2012from Landsat 7ETM+and HJ-1Asatellite multispectral remote sensing through artificial interpretation,and graded the urban heat island intensity by using the land surface temperature product obtained from MODIS,then analyzed the temporal-spatial change of urban heat island and land use changes and revealed their relationship.The results indicate that:1)the urban heat island effect in Wuhan city is of medium and high intensity,with its intensity highest in the downtown areas and declining to the periphery of each district and showing a tendency of connecting together,showing the same expansion pattern with urban areas;2)generally,urban heat island in Wuhan city is intensified by the expansion of urban construction land.
The image quality would decline and make the post process become difficult,because of the noise which included in the original image.As a result,the image denoising algorithm based on the GM(1,1)-gray Verhulst combined model is proposed.Firstly,analyzing the nature of noise,building the gray model and using the predictive value instead of the original value.So that the information of image would be effectively exploit.Secondly,the differences between GM(1,1)model and gray Verhulst model are analyses,so the combined algorithm to move noise has been come up by the two models.Finally,comparing the treatment effect with the median filter、GM(1,1)model and gray Verhulst model.The results show that the combined algorithm can donise effectively,the image contrast and the edge information have been maintain.The result verifies the algorithm useful.
China has faced a period of rapid urbanization,and also witnessed a rapid growth of urban land.The study on the changing rules of city size distribution of China is conducive to the rational allocation of urban land and the coordinated development of urban system in the urbanization process.On the basis of the data on the built-up areas of Chinas cities in prefecture-level and above from 2000 to 2012,this paper studies the change trend of the city size distribution in China and analyzes the regional differences in the changes by adopting the rank-size rule and fractal theory.The results show that:1)the built-up-area-measured city size distribution of China is consistent with the rank-size law;2)the logarithmic rank-size curves of the city size parallel and move outward,indicating that the total amount of urban land have increased,but the Zipfindex of city size distribution has increased over time,indicating that the equilibrium degree of city size distribution have declined;3)the growth rates of the urban land in the cities with built-up areas more than 500km2 and between 200-500km2 have been greater than those in the cities with built-up areas between 50~200km2 and less than 50km2;4)The change of the city size distribution in different regions is different from each other,and among the four regions,the Zipfindex of city size in the east region is always closest to the ideal value of 1,suggesting that the development of urban land in high,medium and low ranks in the east region is relatively coordinated,while the city size distribution in the northeast and west regions has a tend of being concentrated,with the high-rank cities having faster land expansion than the medium and low-rank cities,and the city size distribution in the central region is relatively scattered,but in recent years,the high-rank cities have expanded significantly.
Based on the landscape pattern data in year 2000,2004 and 2009respectively,this paper aims to assess the landscape ecological security of a rapid urbanizing areaNanchang city proper.The index system of landscape ecological security is built on the landscape structure and landscape function.Then spatial autocorrelation methods are employed to analyze the characteristics of the spatial pattern.The results indicate that:(1)from 2000 to 2009,landscape structure security,ecosystem service value and ecological resilience have gradually decreased,and the degree of overall landscape ecological security has largely reduced.(2)Higher and high ecological security units continually transform into medium and low ecological security units,the state of landscape ecological security continues to deteriorate.(3)There is a significant correlation on the spatial pattern of landscape ecological security.Higher ecological security units aggregate in the northwestern Wanli district,and the areas of higher ecological security units have continuously decreased.Medium ecological security units distribute in south-central Donghu,Xihu and Qingyunpu district.With the expansion of urban built-up areas,and the scopes of medium ecological security units have increased.Low ecological security units aggregate on central and southeastern urban fringe of Qingshanhu district,and the areas have gradually increased.
The traditional ICA that recovers all the source signals simultaneously,Independent component analysis with reference(ICA-R)can extract only some desired source signal from mixtures of all source signals by incorporating aprior information into the separation process.In this paper,in order to extract the desired speech signal from the mixed speech signals,is based on empirical mode decomposition(EMD)method to get the power spectrum envelope as a reference signal,and then apply the reference signal in the ICA-R algorithm,achieve the purpose of speech enhancement.Computer simulation and performance analysis results show that this method can achieve the purpose of speech enhancement when in a case with noise interference.
Shandong province is a drought-prone region in China,with the droughts of high frequency,lasting long and wide influence range,which have impacted the agricultural production and economic development.In this case,it is of great significance for us to evaluate the resilience of the agricultural system from drought in the province,since it can provide references for developing disaster mitigation strategies.This paper put forward a suitable model evaluating the resilience of agriculture to drought disaster on the basis of the intrinsic link of the vulnerability of the agricultural system with its resilience to drought,and then tried to build a resilience index by using historical data.The results show that:1)climate,land use status,farmersincome and input are the key factors influencing the regional resilience to drought;2)the resilience to drought in the period from 1980 to 2013has been relatively stable,but lower in 1983,1987,1994,1998 and 2002,and higher in 1984,1990,1996 and 2005.3)from the angle of space,the resilience will be highest in Qingdao and lowest in Liaocheng in 2014.
With operating on hub-and-spoke(H/S)logistics network,the competition between a newcomer service provider and an existing dominating alliance operator is addressed in this paper.Firstly,the H/S network design strategies of a newcomer service provider and the H/S network adjustment strategies of the small and medium-sized operator are discussed to improve their customer market share on the view of reducing transportation cost and transportation time of OD(Origin-Destination)flows.Secondly,the relation between transportation cost and transportation time and customer market share utility function is analyzed,and the corresponding step customer utility function,linear customer utility function and nonlinear customer utility function are also proposed.Then,mixed integer programming models about H/S network design and network adjustment are formulated based on the different customer utility functions.Meanwhile,the nonlinear objective function is transferred into second order cone programming constraints to overcome its complexity.Finally,the impacts of the different decision preference weights,customer utility function and transportation cost and time on H/S network design and network adjustment are analyzed through the experimental results.
Utilizing the related data of the global top 10 multinational hotels,this paper analyzes the spatial pattern of these multinational hotels from intercontinental and national scales respectively,and explores the factors influencing the global expansion localization of the multinational hotels by using correlation analysis and stepwise regression analysis.The results show that:1)the multinational hotels have mainly located in the developed countries in North America and Europe,but in recent years,the emerging economies in Asia and Latin America have become important destinations for the global expansion of multinational hotels;2)the distribution of the multinational hotels in the world shows the characteristic of highly concentration,with the United States as the core area of their distribution,the United States,France,Canada,China,the UK and Germany as their main distribution countries,and China,Mexico,Brazil,India,Indonesia and Turkey as the most important growing areas for the distribution of the multinational hotels;3)the number of the global multinational hotels in a country(or whether a country is taken by multinational hotels as expansion location choice)has been significantly and positively affected by the international tourist arrivals,airline passenger volume while negatively affected by the highway mileage of the country,indicating that the linear model this paper established can explains well the relationship between these three factors and the number of multinational hotels of a country.
Colletotrichum higginsanum can infect cruciferous vegetables plants,causing tremendous economic losses in agricultural production in many countries.GPCR as a perception protein of G protein signal transduction in vivo plays an important role in the signal transduction process.Based on the three typical GPCR sequences had been reported in Saccharomyces cerevisiae,to search GPCR-like protein sequence from the protein databases of Colletotrichum spp.with the Blastp as well as the use of keywords,and the seven trans-membrane domain of four typical GPCRs were analyzed by using the TMHMM.Meanwhile,through bioinformatics analysis including the signal peptide,subcellular location and the secondary structure,there is high proportion of helical structure and not contains significant signal peptide sequence in every GPCR protein,and which positioned in the plasma membrane.In addition,analysis of genetic relationships through comparative four GPCRs in C.graminicola with 23 homologous sequences in other species,both C.graminicolaand C.fioriniae have a high sequence homology and close genetic relationship with C.higginsanum.This study could provide strong theoretical foundation to the function of GPCR,and provided an important theoretical guidance to clarify the other pathogen in Colletotrichum spp.
Using the content-based image retrieval technology(Content-Based Image Retrieval,CBIR)can be more quickly find the user to query image from the vast network of image library,but a single visual features can not adequately describe the image content information and other issues,thus reducing the accuracy of the search results.In light of this,this paper presents a fusion of a variety of image retrieval algorithm,the method first construct a chromaticity distribution Zernike moments for color image feature extraction,and then use the Contourlet transform multi-directional image multiscale decomposition,and calculating the variance and entropy of each sub-band decomposition,as texture features of images,then these features and calculating normalized weights corresponding to each feature.Finally,calculate the similarity between the images of these features,the search result is returned and sorted.Simulation results show that this multi-feature fusion method can multi-level search algorithm describes the semantic information of the image,to some extent,improve the image retrieval precision and recall.
This paperstudy on fleet deployment question for Liners basing on green and low carbon environmental protection in a novel perspective.In the trend of global commitment toenvironmental protection and emission reduction,the rights of carbon emissions will also become a kind of scarce resources,with the carbon tax mechanism of shipping industry was introduced gradually,due to the increase in the carbon tax cost,the carbon tax costs considerations into the fleet deployment optimization model is very necessary.This paper establishes a new model of fleet deployment based on the classical model,deduced the mathematical relationship between oil consumption and round-trip time,voyage cost and the voyage times,and optimized in carbon emission constraint conditions.And through an exampleto solve the model by using Lingo.Research result shows that:After considering the constraints of carbon emission and carbon taxfactors,fleet deployment for liners can be achieved and optimized with limited carbon emissions situation,meet the needs of the customers and make profits for the company.
The gel rate of the emulsion often appear too high,the size of latex particle is too large,and the distribution curve is too wide,the emulsion is easily demulsification in the preparation process of coating and the minimum film-forming temperature is too high.We used the cheap,the non-toxic,the pollution-free,reactive of maleate emulsifiers made by myself to be the soap-free emulsion reactive surfactant to solve the problem.Chosing the different characteristic of emulsifiers,then compound them to prepara the emulsion.After the preparation of film,contrast the ability of film-forming,water resistant,acid and alkali resistant to determine the better group.then through size and potential of the test,scanning electron microscopy test to determine the performance of the emulsion.The radio of the maleic acid ester emulsifier with the OP was 1∶1,the water absorption rate was 8.27%,the solid content of 48.06%,the gel rate was8.16%,the monomer makeup rate was 98.01%.The emulsion particle size was controlled at 3.325 dnm,PDI was 0.233.
The problem of function projective synchronization of Lurie dynamical networks with nonlinear coupling is studied in the paper.Two drive-response dynamical model with nonlinear coupling is founded in the paper.It is proved that Lurie chaotic systems is synchronized using modified function projective synchronization approach based on Lyapunov stable theory.Numerical simulations example of chaotic system verify the effectiveness of the proposed method.
Network television as a new type of modern media,with its convenience in operation,abundance in content,and the advantages of the interactive environment,is becoming a new approach to learning modern education teaching.The current E-Learning system has universal problems such as the simplification of content and structure,disorders of teaching resources and low reusing and sharing of teaching resources,lack of personalized learning and education,and so on.The present study constructs knowledge management-oriented virtual slice learning model of network television education system including the integration application of network television and excellent curriculum resources,virtual slice of key knowledge point in high-quality courses,application model and knowledge resource acquisition in slice retrieval,study habits,interactive environment,etc.and realizes digital virtual slice learning platform of a low-cost HD and SD network television system supporting IPv4/IPv6 protocol.The similarities and differences about how to manage knowledge between the virtual slice retrieval learning of excellent courses knowledge and traditional educational model are investigated by this platform.This study provides a good technical support and platform services not only for constructing virtual slice retrieval learning mode of network TV system,but also for intergration and application of high-quality courses.
It is of great significance to objectively evaluate the effect of the recovery of Dianchi wetland environment and to have an overall management of the Dianchi environment protection and wetland ecological system.Concerning the actual condition of Dianchi wetland ecosystem,we designed three element layers and selected fifteen corresponding indicators to evaluate the healthy condition of the wetland ecosystem.The five element layers included water environment index,soil index,biological index,landscape index and social index.Fuzzy synthetic evaluation,analytic hierarchy process,expert scoring and other methods are used to establish the evaluation criteria.The results showed that the ecosystem health indexes of Dianchi wetland was 0.5992,which indicated that Dianchi was between sub-healthy and healthy state.The reasons of its influential factors were analyzed as well.
The DMPD assay was used for evaluating scavenging effect of several botanical products on free radical DMPD˙+.The results indicated that 11 kinds of monomeric compounds and sea-buckthorn seed oil exhibited different antioxidant activities in this system.In flavonoids group,quercetin displayed the strongest scavenging capacity,apigenin showed the weakest,rutin and puerarin were medium,at 100μmol/L,the clearance rate was 55.76%,16.64%,2.25%and non-scavenging,respectively.As phenolic compounds,ferulic acid showed the strongest action,the clearance rate reached 96.78%at 100μmol/L.Triterpenoids ursolic acid exhibited more effective than oleanolic acid,at 1μmol/L they exhibited the highest scavenging rate,23.05% and 3.05%,respectively.Sea-buckthorn seed oil had the definite effect,the half clear concentration is12.84mg/mL.The results provided date to the further use and reasonable concentration in application of these compounds.
Micro-blog is an important carrier of electronic word-of-mouth,which has affected the purchase decisions of consumers and product sales of businesses.In this article,we study the problem of mining sentiment information from Sina micro-blog and investigate ways to use such information for predicting product sales performance.We analyze the affecting factors of micro-blog reviews,and establish the sentiment compute method of micro-blog based on fuzzy sentiment ontology,then put sentiment factors into the autoregressive model,present autoregressive sentiment predicting model for predicting product sales performance.Extensive experiments were conducted on a movie data set.We analyze the parameters selection,and compare our model with alternative models that do not take into account the sentiment information.Experiments confirm the effectiveness and superiority of the proposed approach.
Traditional power quality comprehensive evaluation methods often ignore the executive experience preference information.In view of the problem,the paper used the utility function theory,put forward a new method of power quality comprehensive evaluation based on UTADIS.The proposed method firstly directly employs rating line formulated by the state as nodes,and then uses the experience information of executives or experts construct a linear programming model to estimate the utility value of each node.Finally,according to the utility values,it rates monitoring points.Example shows that the proposed method is practical and objective,and can effectively evaluate the level of power quality.
We obtain B?cklund transformation on surfaces which are swept out by moving curves with constant torsion in Minkowski 3-space.Our discussion is divided into three different cases,i.e.,the parent curve being timelike,spacelike with timelike principal normal,and spacelike with spacelike principal normal.The curvature of the moving curve discussed in this paper is governed by the negative modified KdV equation or modified KdV equation.Our result can be regarded as geometric realization of the B?cklund transformation for the negative modified KdV equation or modified KdV equation.
