In this paper, the idea and method for surface modification of rubber using low temperature microwave p;asma are provided, and the theory of microwave plasma surface modification of rubber is discussed. It is discovered that the contact angle between the liquid and the treated surface of rubber obviously decreases with greatly improving water wettability, the polar functional groups of the modified surface of rubber greatly increase from ESCA, and the adhesion of the rubber treated with microwave plasma to steel evidently increases.
In order to study the relationship between vegetative cell and resting cyst, RAPD method was selected. The result revealed that: the polymorphic fragments amplified with primers S176、S267、S217、S259 and S319 share the same fragments, but the other primers such as S283、S180、S61、S64、S17、S55、S38、S30、S23 and S28 have deferent amplied fragments. There are 84 fragments were amplified by 15 random primers. In these fragments, both vegetative cell and resting cyst mtDNA have 28 similar fragments. The similarity values is 66.67%. It is implied that though there is similarity between mtDNA of vegetative cell and resting cyst, some changes may occurred in resting cyst mtDNA, these changes may be related to the function of resting cyst mitochondrion.
In this paper,we have discussed motion of particle on a fixed hemispherical smoothless surface and obtained following results;
(1) Construct dynamical equation and gave its solution.
(2) Establish range of particle initial kinetic energy .
(3) Find out relation between escape angles and coefficient of kinetic friction.
Forest fragmentation may lead deleterious consequences for plant community.Species richness and composition of fragmented,peninsular and continuous evergreen broad-leaved forests were investigated to evaluate fragmentation effects. Fragmented torests contain more apecies than continuous forests with comparable areas.Species richness is lowest in peninsular plots. Peninsular forests have few or comparable species richness. There are more exotic species (cultivated and escaped) in fragmented and peninsular plots than in continuous forests. Our study shows that patch size plays important role in species richness and composition. However, the surrounding matrix, time experiencing fragmentation and human disturbance also affect the plant species and composition. Liana is very low in disturbed peninsular forests and refllects the worse forest quality. It may be a useful indicator for conservation and management of evergreen broad-leaved forests under intensive human disturbance areas in eastern China.
Taking Jing'an district of downtown in Shanghai as an example, the paper selected 580 catering and service industries in four seasons of 2000 and analyzed discharge levy according to cover 1000 monitoring data. The case study shows: ①The accumulative pollution load proportion of CODcr and Oil exceeds 95%, so they are the typical pollution factors in wasterwater.These trade that discharge wastewater above 1000tons per month are main pollutant headstreams for their total pollution load proportion is beyond 60%. The relationship betweenpollutant concentrations and scales of enterprises is negative and the concentrations are much thicker in amount of small scales trades. ② The relationship between the discharge levy amount and the total pollution load retains a highly positive correlation.The unit price ascends with increasing pollution load containing in per ton wastewater and they significantly accords with cubic estimation model. ③ The average unit price in Jing'an district at the level of 0.26yuan is lower than the average pollution abatement cost of 0.56yuan in wastewater plants in Shanghai.Based on above data analysis,the paper discussed regulating approaches on discharge levy of catering and service industries, such as implementation of all-out levy, combination of total quantity and concentration controlling, et al.It intends to supply external foundations for discharge levy standard and monitoring model in catering and service industries.
G is a simple graph with a(G) and k(G), its algebraic and vertex connectivity.This paper finds all the graphs satisfying a(G)=k(G).G=(V,E) is a simple graph of order n with vertex connectivity k(G)≤[n/2],and H is one of G's minimal vertex cut set,then a(G)=k(G) holds if and only if for every u∈H and every v∈V\H, uv∈E.
Let ∮be a family of meromorphic function on the unit disc ⊿ and let a and b be distinct values. If for every f∈∮, f and f(k) share a and b on ⊿ and the zero of f(z)-a are of multiplicity ≧k,where k≧3 be a positive integer,then ∮ is normal on ⊿.
This article introduces a software platform which as is used in porable equipment supporting GSM or GPRS.It discusses the design and implementation of MIMI on this platform and provides connunication mechanism of system structure.It also improves interface to make it more humanized.
中国综合性科技类核心期刊(北大核心)
