The stress distribution characteristics of the polycrystalline layer( PCD) in polycrystalline diamond compact( PDC) were examined by micro-Raman spectroscopy( micro-Raman spectroscopy) and X-ray diffraction( XRD). The influences of residual stress on the different synthesis parameters( diamond particle size,temperature and binder ratio) in the PCD layer were studied. The results showed that:( 1) the stress value on PCD layer surface increased with the increase of initial diamond particle size;( 2) within the range of PDC synthesis temperature,the residual stress increased with sintering temperature increasing;( 3) the residual stress of PDC first reduced and then increased with increasing binder content,and under the suitable metal binder content had lower stress value. So,the macro-residual stress of PDC can effectively reduce by controlling the synthesis parameters.
In this paper,according to the campus network access security certification problem,the 802. 1x certification procedure based on the analysis of 802. 1x and the certification system structure was introduced combining with the current network structure and user characteristics. Using the topological structure of the campus network,the access control security certification based on 802. 1x in access layer was implemented,and the campus network information access security and controllability was improved.
In recent years,nanocomposites,combining more than two types of nanostructures with prominent advantages,are important building blocks for advanced materials,and will improve the original properties of the pure components. This paper reviewed the development of Zn-based nanocomposites,which shows a wider application for photocatalysis,optoelectronics,biomedicine,etc.,and gave the prospect of it.
Nonsingular H-matrix is a special class of matrices and plays a very important role in numerical computation,matrix theory and control theory,etc. In this paper,some new criteria were given according to the relations of α-diagonally dominant matrices and nonsingular H-matrices,which extented and improved some related results. Effectiveness of these criteria was illustrated by numerical examples.
In this paper,it studies the properties of coloring some plane graphs by using the properties of chromatic polynomial of plane graphs. It deals with mainly the properties of coloring some plane graphs after triangulation and generalized division. It studies the smallest number of ways to faces-color the graph with colors so that no two adjacent faces receive the same color,by discussing the zeros of the chromatic polynomial of graphs. And given the important properties of the number of ways to color plane division graphs. It proofs that the smallest number of coloring some plane graphs is not change under triangulation and generalized division.
In this paper,the consistent join-complete lattice was defined based on semiprime filter,and then the concept of consistent join-semicontinuous lattice was introduced and examined. In addition,some mapping properties of consistent join-semicontinuous lattice were also discussed and the fact that any retract of a consistent join-semicontinuous lattice is still consistent join-semicontinuous lattice also obtained.
Somatic embryogenesis receptor-like kinase( Somatic embryogenesis receptor-like kinases,SERKs)widely present in plants,the heported works found SERKs assume multiple roles in plant life activities,participate in the regulation of plant growth,somatic embryos formed,sensors and other hormones. Through bioinformatics tools SERK classification of plants,the average hydrophobic transmembrane regions and signal peptides were forecasted and analyzed.
Our aim is to explore the variation in the optoelectronic properties upon the donor-π-bridge-acceptor-π-bridge-donor type naphthalene-based derivatives considering solvent effect by quantum-chemical calculations.Our results showed that,in comparison with those of the pristine molecule,naphthalene substitution and theCH/N substitution on naphthalene are powerful approaches for the tuning of electronic and optical properties.Hopefully this theoretical investigation on the optoelectronic properties of naphthalene-based derivatives could give some hints for the design of more efficient functional materials in OLEDs.
The glide returns to return and be apart from the even two methods are used to analyze the temperature data of Shenzhen's and Yulin's weather station from 1961 to 2001,to determine the influence of the urbanization to the district 's temperature,and analyze the four factors that affect on the temperature rise: the change of Descend a mat noodles property when the city turns,artificial heat and air pollution,the city scale and shape,high and low-pressure air mass and so on other reasons. Then put forward solutions: to increase devotion to urban afforesting and greening,to raise the percentage of greenery coverage,to program reasonably city building,appropriate the reservation reduces and the increment city water area,to control population and artificial heat.
It discussed the first kind weak total chromatic number of the double graph of circle,fan and wheel,and we also gave the constructive proof of them,then verified these graphs to set up the first weak total coloring conjecture.
The interpretation of"comprehensively implement the rule of law"by overseas media and scholars is an important part of the research of"comprehensively implement the rule of law"."Comprehensive-ly implement the rule of law"has an important and far-reaching significance for the development of China. It needs multi-lateral cooperation and takes more measures simultaneously. Not only inspiration and reference were provided, but also provide an important ideological resource to promote deepest study. But some overseas media and scholars are not objective or even hold the wrong opinions. The analysis of the"comprehensively im-plement the rule of law"is not comprehensive, systematic and in-depth. With the promotion of the"four com-prehensives", the interpretation of"comprehensively implement the rule of law"is becoming more and more perfect and in-depth.
Considering the constraints on the scalar leptoquark( SLQ) free parameters from low energy precision measurement data,the correction effects of the SLQs on the rare decays Λ_b→Λl~+l~- with l = e,μ and τ were investigated. It was found that,for the decay Λ_b→Λe~+e~-,since the constraints given by the current experimental data on the combination coupling | λ~(31)λ~(21)*| / M _(LQ)~2 is very loose,the contributions of the SLQs to Λ_b→Λe~+e~- are too large. If the branching ratio Br( Λ_b→Λμ~+μ~-) can be precisely measured at the LHCb in near future,the indirect signals of the SLQs might be observed at the LHCb.
With the development of geographic information systems and intelligence mobile terminal,the traditional digital campus has lagged behind the development trend. Today,the mobile terminal develops rapidly,that the necessity of digital campus APP is obvious. The digital campus APP,which developed based on the Super Map i Mobile of Android platform improves the existing digital campus. It has some practical value to adapt it to today's trend.
The microwave wavelength was determined by Michelson interference experiment at first,and then by changing the location of simulation crystal and the relationship between the incident angle and the diffraction intensity of( 110) crystal plane was measured,the situation was studied to agree with the Bragg's law. When the position of the crystal is located in the center of the experimental apparatus of microwave integrated optical,the data meet the Bragg's law very well. When the crystal is located in the front of the center,the Bragg diffraction peak moves to the right and the diffraction angle increases. Instead,when the crystal is located in the back of the center,the Bragg diffraction peak shifts to the left and the diffraction angle decreases. Compared with the actual crystal powder X-ray diffraction experiment,in theta-2theta scanning mode,when the sample amount is too little,i. e. sample sag,the diffraction angle becomes smaller and diffraction peak shifts to the left. As well,the sample amount is too much,i. e. sample projection,the diffraction angle becomes larger and diffraction peak shifts to the right. These results are similar nature in these experiments. However,the microwave Bragg diffraction experiment is a visual image to facilitate students understanding of X-ray diffraction experiment.
In this paper,it is proposed that a prime power ofthe complete graph KPn( pis a prime) vertex number has abelian homogeneous factorization based on theinvestigation of abelian homogeneous factorization of complete graphs,and thegroup Mcontains an elementary Abelianp-group. In addition,for Kn( non-Prime Power),a sufficient condition forthe existence of abelian homogeneous factorization is obtained.
Based on the analysis methods of geological information,using ARC / INFO,the RS software,markov probability model for auxiliary,use of jilin province in the north western area of land use pattern 2 spatial data( 1990,2010) synthesized by a series of land use pattern change map,and through the spectrum analysis the study area of land use pattern change rule was studied. Results showed that in the past 20 years in jilin province in the north western region of land use structure changed significantly,arable land,a substantial increase,net area of 3 329. 7 km2,occupies a total area of more than 7%,it mainly comes from grass,unused land( sand,salinealkali land) wetland; Grassland are greatly reduced,the net reduction of area of 3467. 7 km2,occupies a total area of more than 7. 3%,mainly due to reclaiming grassland as arable land,grassland converted into woodland and grassland degradation caused by; Residents and industr ial and mining land and unused land( sand,salinealkali land); Waters and the trend of wetland was significantly reduced.
Study of the ionic associate that is compounded of Cadmium( Ⅱ)-KSCN-Rhodamine. By micro filter membrane,the compound and the membran were dissolved in DMSO,and a new spectrophotometric method was presented for the determination of trace Cadmium( Ⅱ) by spectrophotometric determination of absorbance of the organic solution system. Its maximum absorption is 580 nm with molar absorptivity being 6. 85 × 105 L / mol·cm and the detection limit is 6. 77 × 10- 10 g / m L,the linear range is 0. 001 ~ 0. 14 μg / m L. The proposed method has been successfully applied to the determination of Cadmium( Ⅱ) in water and food samples,and the satisfied results were obtained.
By histological and microscopic observation,the p. sylvestris stem was studied. To observe and measure the stem xylem tube cell diameter perimeter and area,and pipe thickness of cell wall,that p. sylvestris stem has a strong ability of conducting.
In this paper,silica aerogels had been reinforced with brucite fiber due to the low strength and poor toughness of pure silica aerogels,but the key of study was the preparation conditions. The optimum preparation conditions had been studied by optimizing the type and amount of dispersing agent and the amount of fiber. The results showed that the optimum preparation conditions were that dispersing agent was chosen to sodium dodecylsulphate,the dosage of the dispersant was 15%,and the quality of fiber was 4% of pure silica. Under these conditions,the prepared fiber reinforced silica aerogels had the best mechanical properties.
The rotary inertia of rigid body is one of important physical concepts,and the calculation on rotary inertia is also one of the difficulties of physics. In this paper,the rotary inertia of homogeneous sphere was firstly calculated according to its definition. Moreover,through analysis of the calculation results,the rotary inertia of homogeneous spherical shell and surface was also analysed by compensation principle. It is helpful for students to understand the calculation of rotary inertia,and it can also arouse the studentsu0027 interest in learning physics.
