Search

Digital signature plays a more and more important role in e-commerce. The basic methods of digital signature are introduced and a digital signature scheme based on digital certificate is proposed in this paper. Digital certificate is generated after personal information is written. The effective data, RSA parameters and signature results are included in digital certificate. The related RSA parameters of private key certificate are encrypted by private key password. The digital digest is gotten through hash algorithm in this scheme. Digital signature is operated by using RSA parameters in private key certificate and the signature is verified by RSA parameters in public key certificate by verifier.

The paper launched a study of waterproof material for mudstone in gas drilling. The adhesion with rock surfaces and water resistance of four synthetic waterproof materials were experimentally evaluated. The results showed that the four synthetic waterproof materials had a good adhesion to the surface of the rock, which could meet operational requirements in the vertical plane. The synthetic waterproof materials had excellent waterproof property, and could withstand immersion in water of more than 72h.

China has been the country which is suffering serious coastal erosion that primarily caused by the increase of hydrodynamic force and the unbalance between input and output sediment. Comparing with the traditional revetment, most of which were made of reinforced concrete, the ecological shoreline protection can prevent coastal erosion in an ecological method. In this article, a biodegradable coastline protection mat (BCP-mat) was proposed and different arrangement methods direct to various areas was presented to solve the problems such as high cost, complicated construction caused by existing ecological method. In the end, the existing technology problems and promotion difficulties was discussed in the perspective of design and management.

The terahertz (THz) spectrum technique has become an important research content of electromagnetic field in recent years. Folded waveguide backward wave oscillator (BWO) is suitable to be used as THz high-power electromagnetic radiation source. Because it can realize electronic tuning within a wide frequency band and doesn’t require pre-stage source amplifier. In this paper, the high frequency characteristic, the transmission characteristics, and the particle beam wave interaction characteristics of the structure of folded waveguide BWO have been analyzed, and it is utilized to design geometry parameters of 650GHz folded waveguide slow-wave-structure (SWS). The design is been validated by particle beam wave interaction simulation experiments. The experiment results show that the output is over 1.7W within 42GHz bandwidth, and the electron efficiency can exceed 1%.

PTT material is suitable for shaping clothing because of its excellent shaping and crease recovery performance, but if as underwear, the wearability of PTT material is being questioned. Based on the L9(34) orthogonal array design, two kinds of samples were kitted utilizing nylon core-spun yarn as ground yarn PTT/nylon filament and Polyester/nylon filament as face yarn respectively, mixed proportion and structure were controlled in the sample design. Test 6 basic wearabilities of samples, the wearabilities of samples were investigated by fuzzy mathematical analysis. The results of this research can be a good reference of shape wear fabric selection.

Empirical analytic method and theoretical analytic method are usually applied to calculate and predict water gushing yield in the tunnel engineering in the past but have much limitations and errors. Ample water source, hydrodynamic conditions and expedite channels are essential for water-bursting accidents in railroad tunnel engineering. From a lot of study of fractal geometry in rock mass, it is found that the multi-dimension value of fissure network is colligate reflection of the length, the direction, space and the number of fissures, so the value can be used to describe the complicated frameworks in rock mass. But it is a sound tackle to quantities the complicated frameworks. Numerical simulating method is convinced to be applied to calculate and predict water gushing yield of tunnel and underground engineering. It focuses on analyzing texture characteristics of water-containing medium, building hydro-geological conceptual model, and modeling long-term hydrodynamic field development. An experimental application in Paoziling tunnel under-crossing mountain reservoirs in Hunan province was presented in this article, and long-term hydrodynamic field development had been obtained under the condition of drainage from the tunnel, and the gush yield in the tunnel during the process of storing water in the reservoir was also predicted.

Recently, the tufted carpet pattern are getting more and more complex. However jacquard machine equipment is relatively backward and it has low degree of automation, which has caused a lot of labor and low efficiency. To solve these problems, the pattern forming principle of the tufting jacquard machine was studied and the design of automatic control system was put forward. So an embedded electronic jacquard machine controller based on ARM7 was developed.

New degradable cushioning packaging materials based on bagasse pith, magnesium bisulfite spent liquor and reinforcing silica were prepared by press-molding process. The effects of precipitated silica loading and the specific surface area (SBET) on the apparent density and the static compressive strength of cushioning packaging materials were investigated. Meanwhile, the microstructure and morphology of different types of silica fillers were analyzed by scanning electron microscopy(SEM). Static compressive strength of BPCPMs was improved significantly with the addition of 0.5%(w/w) silica. However, the compressive stress of BPCPMs increased at first and then decreased with increasing loading of silica. Increasing silica dosage increased cushion efficiency of BPCPMs at higher stress levels. The compressive stress increased with increasing SBET value, and under high strain conditions, the increase scale in compressive stress also improved.

This paper studied the Na2O-B2O3-SiO2-CaO-P2O5-F glass-ceramics and obtained the complex biological glass-ceramics with low sintering temperature, high mechanical properties and good biological activity. In this paper, the better basic point was selected in phase region of Na2O-B2O3-SiO2 glass system. It was studied that the effect of different percent of CaO, P2O5 and F addition on the mechanical properties and biological activity of the glass-ceramics. The glass powder was prepared by melting and quenching in water, and then by molding and sintering, composite glass-ceramics materials was obtained. With the help of DSC, XRD and SEM analysis methods and testing means, the phases and heat treatment systems of the material were determined, and the microstructure of materials in the different heat treatment conditions was observed. The biological activity was tested in SBF simulated body fluid . Research shows that: the introduction of F can effectively reduce the melting temperature of the material and is helpful to crystallization. The introduction amount of CaO, P2O5 and F can affect the biological activity of glass-ceramics. In the range of introducing CaO, P2O5 and F in this paper, the mechanical properties and biological activity of glass-ceramics increase with the amount of the introduction of CaO, P2O5 and F.

Most of UV protection textiles are made of chemical fibers, and a large part of them have poor air permeability and moisture permeability, which influences the wearing comfort. This work blended polyester and linen to produce a new kind of knitted fabric and tested the fabric structures, air permeability, moisture permeability and UV value. Excel and SPSS were used to compare the properties of new knitted fabrics and find out the relationships between the constructional parameters and properties. The results indicated that there are regression equations between constructional parameters and properties and got a new kind of UV protection fabric with good air permeability and moisture permeability.

Vibration energy harvesting has played a major role due to the almost universal presence of mechanical vibrations. It is demonstrated experimentally that a piezoceramic cantilever generator can be substantially enhanced by introducing a magnetic coupling force in this paper. The piezo-electromagnetic generator consists of a 44mm×20mm×0.7mm bimorph piezoelectric ceramic and two Φ8mm×4mm permanent magnets located at the tip of the beam. The greater bending deformation will be caused because of the permanent magnets and applied magnetic field. Then the generated charge is increased because it is proportional to the vibration amplitude of the tip of the beam. Experimental results show that the generated voltage enhances from 3.04V to 4V for the attractive force and changes from 3.04V to 3.78V for the repulsive force when the distance between the magnets is 20mm, increased by 31.6% and 24.3%, respectively. It also shows that the attractive force is better than the repulsive force from the view of enhancing the generation capacity. It proves that the method is effective for improving the output energy of the piezoelectric cantilever.

The common swimsuit fabrics on the market are mainly polyamide/ spandex, polyester/ spandex blended at present, which have some defects such as easy deformation, short service life etc. Sorona is a new kind of biomass fiber with low carbon and environmental protection, which has more superior performances than spandex that could ensure the fabric elastic lasting and stable. The paper uses seamless technology to weave new polyamide/ Sorona/ spandex swimsuit fabric, and compare with the ordinary polyamide/ spandex, polyester/ spandex fabric, by testing the specimen of tensile elasticity, elastic recovery and plasticity deformation rate, burst strength, and many other swimsuit related performance metrics. Come to conclusions: polyamide/ Sorona/ spandex fabric with superior elasticity, good comprehensive performance of elastic recovery and plastic deformation rate, excellent burst resistant performance , small hygroscopicity and fine permeability is suitable for swimsuit fabrics, providing reference for the development of high comfort seamless swimwear fabric.

This paper selected 10 kinds of fabrics of thermal underwear, which are the representatives on the market; carried out tests on the fabric properties (thickness, density, the gram per square meter, etc.) and the fabric wearability (permeability, water vapor permeability, wicking height, insulation and antistatic properties, etc.); analyzed these data by using SPSS, finding out the factors which effect the warmth, moisture permeability, air permeability, etc, as well as the relationship between these factors. This article evaluated fabric wearability comprehensively by using concentrated reflection method and function value evaluation method to select the proper fabrics of thermal underwear under different conditions. The results of this research can be a good reference of thermal underwear fabric selection for enterprises.

The X-ray diffraction of hydrated calcium silicate is analyzed and is applied in papermaking. It shows that hydrated calcium silicate have certain crystalline state. The tensile strength, tearing strength and folding strength of paper decrease in different degree with the increase of dosage of hydrated calcium silicate while the whiteness and the printing color density of paper improve. T tensile strength and folding strength of paper decrease in varying degrees with the increase of dosage of PAM while the tearing strength of paper and the whiteness improve. And the printing color density of paper is the same.

An industrial waste containing large amounts of arsenic (76.90wt %) was studied, which originated from a tin refining process. The As leachability in the waste determined with solid waste-extraction procedure for leaching toxicity horizontal vibration method (GB 5085.3) and the concentration of As in the leachate was 13.10 g/L after 16h of the leaching. The waste was treated using precipitation technology with lime. Addition of lime appeared to effectively reduce the concentration of arsenic in the leachate through the formation of a slightly soluble calcium-arsenic compound. Moreover, it is shown that the optimal amount of added CaO is 5 g per 10 g of waste, and the right pH environment should be over 12.00.

Composite foam sandwich tube, which is a sandwich structure, improves stability of the tube and strength for use compared with single-layer composite, and is available in civil engineering as bearing member of light weight, high strength, and corrosion resistance. Axial compression experiment was made for fiber reinforced resin matrix composite foam sandwich tube which is laid in 5 different ways, and the comparing analysis on damage models was made according to experimental phenomenon. The laws of influence is preliminarily recognized by analyzing influence to foam sandwich tube of fiber laying, modulus of fiber, three dimensional elastic modulus ratio, tube radius, tube thickness.

Land resource is an important part of environmental resources. In order to make better use of limited land resources, we should strengthen the evaluation of sustainable utilization of land resources. Firstly, This paper constructs land resource sustainable utilization evaluation index system of primary from two angles of quantity and quality . Secondly, we uses the AHP method to filter the index. Finally, we constructs the sustainable use of land resources final evaluation index system .

With continuously worsen of environmental,People gradually realize the importance of environment improvement.Development of City as a place for creating wealth becomes a focus problem.This paper introduces the current situation of the development of Shijiazhuang city,firstly.Then we analyzed the problems in the development of low carbon ecological city.Finally, we put forward some development proposals.

The study selects cylinder cloth which weaved by seamless fabric common materials as experimental samples, measures compressed thickness, bending length, extensibility, bending rigidity and etc index of fabrics, uses the stereotyped pleat recovery angle to characterize the setting effect. According to the experimental data, using statistical methods to analyze the correlation of these indicators and setting effects, ultimate goal is to improve fabric dimensional stability whatever wearing or stored, to provide a reference for optimizing the seamless fabric stereotypia. Results show that there is a close correlation between compression properties T2, T100, drape performance F0, shear stiffness G and stereotyped pleat recovery Angle.

Effects of ultrasonic treatment on water-retention value of straw pulp fibers were discussed and the ultrasonic treatment conditions were optimized. The best conditions of ultrasonic treatment as follows: ultrasonic power is 400W, processing time is 90min and temperature is 40°C. SEM shows that a large number of magnetic particles were left inside the pulp fiber cells. Automated Surface Area & Pore Size Analyzer shows a good superparamagnetic behavior.

This paper introduces the Changes in agricultural production of Hebei Province from 1949 to 2011,firstly.Then We analyzed the factors that influence the sustainable development of Agriculture.Finally, we put forward some development proposals.We hope to have reference to the other provinces of the sustainable development of agriculture .

This article puts forward the new research methodology during establishing evaluation index system of industrial manufacturing system competence in He Bei .Firstly, we establish a set of the primary evaluating Index system. Secondly,we assess and screen these Indexes. At lastly ,we determine the final evaluating Index system.The Index system is more objective in this way.

This paper presents a micro-wideband radar experimental system design. Wideband signal source and high-speed data sampling and processing module of the system is discussed in detail. Designed radar experimental system weighs 4.5Kg, with signal bandwidth of 1GHz and effective distance of 5km. The system can realize wideband radar echo real-time sampling and processing functions. On-board Synthetic Aperture Radar (SAR) imaging experiment is done. The imaging resolution of the system is 0.3m, this result is satisfactory. It shows that the system can meet the requirements of a unmanned aerial vehicles (UAV) platform. The design and test results are significant to miniaturization of wideband radar system.

Based on the simulation of a eight-storey reinforced concrete(RC) frame, study has been carried out considering the rigid effect of infilled wall to explore the effect of masonry infilled on the framework by the difference of its quantity . MIDAS structural analysis software is used to make modal analysis and response spectrum analysis for the finite element models. In current chinese specification, infilled wall is often considered as nonstructual components in the buildings regardless load-supporting and shear-resistant action while the impact of rigid effect of infilled wall is not properly considered simply with the method of the reduction of structures’ vibration period. In this paper, a comparison to the current code was also made to get a better understanding of the difference between these two approaches.

Cationic polyacrylate emulsion was used as surface sizing agent and the effects of emulsion properties on paper mechanical properties were studied. The mechanical properties of sized paper gradually increased with the increase of solid content, viscosity and positive charge density of emulsion and decreased with the increase of particle size of emulsion. Tensile strength, folding endurance and tearing strength on machine direction were increased 33.62%, 11.99%, 6.79% respectively when the paper with single emulsion layer was used oven drying methods.

Cationic polyacrylate emulsion was used as surface sizing agent and the effects of emulsion properties on paper printability were studied. Cationic polyacrylate emulsion increases the printability of sized paper. The printability has greatly improved increase with the increase use of emulsion dosage, but the increase of emulsion viscosity influences the printing operation, and one layer of emulsion has already achieve the desired effect, therefore one layer of emulsion is properly.

Using the preliminary research of the polymer properties, the different between the physical and chemical properties of new polymer-clays nanometer composites and clay have been studied. Different polymers are used to evaluate experiment. Based on a large number of lab experiments, the changes of rheological property and API filtration property of polymer-clay drilling fluids nanometer composites are studied. The results show that clay particles could become smaller and the composites drilling fluid have the role of controlling loss and enhancing cake quality. The prepared composites could be used to solve the technical problems in drilling fluid.

The study object is wheat. Through the observation and analysis on the morphological structure of wheat plant, the concepts of microstate, substrate and microstate are put forward, the wheat growth mechanism model is established, and thus the description and control of wheat morphogenesis process could be realized. Based on the branch structure characteristics of plant, the wheat morphological data model based on axis structure is proposed to realize the structural storage of plant topological structure and organ morphological feature data. On this basis, based on the thought of "growth model - morphological feature model - geometric modeling - display model", the technical framework of wheat form visualization is established and on the VC++ platform, the virtual wheat growth system is built with OpenGL. The running result of the system shows that wheat morphological feature can be well simulated with the system to realize the virtual display of the growth process in the individual growth period of wheat.

In order to speed up the vehicles through the expressway toll station and reduce traffic congestion, we analysed of the No-waiting ETC(Electronic Toll Collection System) of expressway unifying the ETC theory and the RFID(Radio Frequency Identification Devices) technology. Firstly, we analysed system's hierarchy architecture, then detailed analysed the basic component of system, and designed the workflow and composing of functional modules, finally, established the model of ETC system of expressway based on RFID, it provides more practical guidance scheme for expressway ETC system.

Single crystal of 5-sulfosalicylato potassium was grown by the method of slow cooling in solution. The crystal shows a good cleavability along the b axis.

With the development of economics, industry competitiveness becomes more and more important and it takes our attention gradually. This paper analyses the industry competitiveness in Hebei Province at present. And in the light of the problem existing in this mode. This paper puts forward some corresponding measures for solving these problems

With the severe competition in the market, it is important for various areas economic development how to improve the competitiveness of industries.This paper analyses the industry competitiveness in Hebei Province by using the principle component analysis (PCA) method.Faced with the factors restricting industry development in Hebei Province ,this paper bring forward some countermeasures and suggestions

Lightweight concrete has been used for structural purposes for many years and it is developed very fast in resent years due to its lightweight and favourable for insulation properties. High strength foam concrete is a fairly new kind of lightweight concrete with excellent properties of outstanding workability, low density and high strength. Responsible for these properties are the macro-, meso- and micro- porosity of the foam concrete which are mainly affected by the foaming agent. The influence of foaming agent’s dilution ratio and foam dosage on the fluidity, compressive strength, flexural strength and drying shrinkage of high density foam concrete designed for structural materials is investigated in this paper.

On the basis of the study on the expressway management business flow as well as the SOA architecture concept, this paper designs the overall framework for a systematical expressway management information platform, which includes network of 3 levels, grading processing, comprehensive monitoring, comprehensive information application management, web portal and security system, and then designs the overall technical frame of this platform. Road administration is the core part of highway administration and the concentrated reflection of external highway administrative management. In addition to the approval of highway property, construction, maintenance and management, its main contents also involve the highway maintenance, highway entrance fee management and other road maintenance. It covers a wide range and there is so much information of deferent types to be processed and used. Although domestic and foreign roads and road administration departments have some information management systems in use, some are special highway road administration information systems[1,2], and some are highway comprehensive information management systems[3], the integrated comprehensive highway information management contents are lack of research, and the professional, comprehensive, open road administration information platform has not been established yet. Therefore, the author conducted the design of constructing advanced road administration information platform structure. This platform uses the service oriented architecture (SOA), integrates advanced information network technology, data communications monitoring and transmission technology, electronic control technology, computer processing technique with 3S, PDA and other advanced technologies, so that it is effectively integrated and used in the highway information management. The construction of the platform will realize the effective and scientific management for highways business, ensuring that the highways are unblocked, and maintaining the road property and rights of highways, thus promoting the development of the industrial management information.

In order to achieve the digital management of null-pollution agricultural products certification and by adopting techniques such as Web Service, distributed database and workflow, this essay has completed the design and development of the system based on the J2EE platform. It includes certification data service subsystem, declare subsystem and certification workflow management subsystem. This system can highly automize and standardize the key link of origin and product certification such as the review of filing materials, site inspection and environment detection. It can automatically generate filing materials, inspection report and evaluation report. It has the function of sending documents among certification management departments at various levels and storing them respectively. This system has speed up the agricultural products origin and product certification integration process and realized standardized and digitalized management of certification work.

This paper give a new design of three level phase delay control polarization controller, which is the key components for state of polarization (SOP) control in the area of coherent optical communication and polarization mode dispersion compensation. Piezoelectric ceramic are used in three of the phase delay unit to realize phase delay control. The polarization controller can achieve infinite control, convert arbitrary input state of polarization to arbitrary expected output state of polarization under low control voltage.

The first systematic study of the (IrnN)0,± (n=1~6) clusters was herein presented by using the B3LYP method of density functional theory (DFT) with the LANL2DZ for Ir atoms and the 6-311+G (3df) for N atoms. The result showed that the ground state configurations of the (IrnN)0, ± (n=4~6) clusters were all three-dimensional. There were much more absorption peaks in the Raman spectrums of Ir3N, (Ir4N)0,+ and (Ir6N)0,± clusters than other clusters. There was no absorption peak only just in the IR and Raman spectrums of the (Ir4N)- cluster in the small frequencies. The outcome is very useful to validate the predicted trend of structural transitions experimentally.

To study the gelatinization pressures of different kinds of starch at atmospheric temperature, eight different starches chosen as raw materials for this paper (5%w/w, at 20°C) by different pressure were treated, then analysed the relations between pressure and starch gelatinization by X-ray diffraction. The study showed that the gelatinization pressure range of different starches respectively in this experiment was: corn starch (~450 - ~550MPa), wheat starch (~ 450 - ~500MPa), tapioca starch (>450 - ~500MPa), water chestnut starch (>500 - ~550MPa), glutinous rice starch (>500 - ~550MPa), waxy wheat starch (~500 - ~550MPa), waxy maize starch (~550 - ~650MPa), potato starch (~700 - ~750MPa).

With the severe competition in the market, the risk that enterprises are faced with is more and more big. But so far, the development of the risk early-warning management system of enterprises in China is relative laggard. Based on this background, the theory of integrate risk early-warning system is studied and applied in Enterprise. The author hopes that it can offer some use to researching on enterprise integrated risk early-warning management.

The effect of the fly ash content on the properties of the fly ash-coal gangue foam concrete was studied in this paper. Results revealed that: With the increase of the fly ash content, the dry density, the compressive strength and the shrinkage of the fly ash-coal gangue foam concrete decrease; the density of the fly ash - coal gangue foam concrete was influenced greatly by the ratio of water to total dry material. The pore structure and microstructure of the foam concrete was analyzed by scanning electron microscopy, and the results show that most of the pores are fine, closed, and even distributed.

Based on boundary element method, a mathematical model of single box floating breakwater with mooring chain under regular wave is developed in time domain. From the comparison with the experimental data, the numerical program can simulate the transmission coefficient variaty tendency well, while on the aspect of the quantity, the numerical result is always larger than the experimental one, for the ignorance of the friction and dissipation energy.

Three-dimensional Reynolds-averaged Navier-Stokes simulations have been performed to explore the aerodynamic characteristics of ramjet projectiles. The turbulence model used is the RNG k-ε model. The numerical algorithms termed total variational diminishing (TVD) was adopted. The complex wave structures of ramjet projectiles with different architecture at different inflow Mach number were achieved by numerical simulation. The influence of inflow Mach number on aerodynamic characteristics and pressure center of ramjet projectiles were analyzed. Results show that lift coefficient and pressure center increase with the argument of inflow Mach number. Ramjet projectiles with different architecture have different drag coefficient trend.

Light-yellow glass was prepared by coating silver film on the flat glass substrate surface with sol-gel dip-coating process. The chemical composition and the valence state of elements on the surface of silver thin film deposited on glass substrate were studied by X-ray photoelectron spectroscopy. Results show that: elements of Na, Mg, Ca exist in the form of their respective stable state, such as Na2O, MgO, CaO, when heat treated at 500°C for 0.5h; but Si is unstable, and exhibit stoichiometrical disturbances. Results of chemical composition and their content by weight percent of silver thin film surface reveal that minute of quantity silver on the glass surface can lead to the glass with light-yellow color. The transmission of light for the light-yellow glass, deep-yellow glass and the flat glass substrate was also analyzed by spectrophotometer, and the results indicate that the light-yellow glass is capable of absorbing UV rays heavily.