THE EFFECT OF STRESS ON PERMEABILITY OE COAL AND POROUS ROCK AND FRACTURED ROCK

In this paper, the permeability of coal, porous rock (sandstone), fractured rock(limestone) varifies with different confining pressure is discussed. Exponential functions between permeability and confining pressure are concluded. As a primary exploratiotion of permeability, it is significant to study coal and rock seepage characteristics and methane emission prediction. It is also useful in mine methane drainage system design.     

Origin and Development of Cliff-side Buddhist Temple in Ba-Shu Area

Cliff-side Buddhist temple is the latest form of Buddhist cave temple.It is the result of a change from close cave space to open cliff-side space under the influence of Chinese civil culture and local architectural system.This article inquires the origin of the cliff-side Buddhist temple as well as its formation in Ba-Shu area considering its historical and cultural background.     

提高两系杂交稻制种纯度的后期管理技术

两系杂交水稻是继水稻矮化育种和三系杂交稻后的第3次重大突破,它蕴藏着巨大的杂种优势.然而制种纯度的高低关系到两系杂交水稻杂种优势水平的发挥.杂交稻种子纯度每下降1个百分点,大田产量每亩可降低4～5千克.为确保生产优质杂交稻种子,除了前期采取隔离和高纯度的亲本外,在水稻生产后期,还应认真抓好以下防杂保纯措施.     

Epidemiological survey of Theileria parasite infection of cattle in Northeast China by allele-specific PCR

An epidemiological survey on a Theileria parasite infection of cattle in Northeast China was carried out using allele-specific PCR and DNA sequence analysis of the major piroplasm surface protein (MPSP) gene. The results showed that 14 of 104 blood samples were positive for Theileria by PCR. Among the positive cases, co-infection with various combinations of C- and I-type parasites was detected in 12 samples; no B- and Thai-type parasites were detected by allele-specific PCR. Phylogenetic analysis based on the MPSP gene sequences revealed that Theileria parasites with the MPSP types 1, 2, and 4 were distributed in Northeast China.     

Molecular epidemiological survey of Theileria orientalis in Thua Thien Hue Province, Vietnam

Theileria orientalis is a benign bovine protozoan parasite that occasionally causes serious economic loss in the livestock industry. We report the findings of a molecular epidemiological survey of T. orientalis in 94 Vietnamese yellow cattle, 43 water buffaloes, 21 sheep, 21 goats and 85 blood-sucking ticks of cattle in the Thua Thien Hue province of Vietnam. The major piroplasm surface protein (MPSP) gene of T. orientalis was detected using polymerase chain reaction from 13 cattle (13.8%), 11 water buffaloes (25.6%), 1 sheep (4.8%) and 9 ticks (10.6%). Phylogenetic analysis using MPSP gene sequences showed the presence of seven genotypes, four previously categorized genotypes (Types 1, 3, 5 and 7) and three new genotypes (Types N-1, N-2 and N-3).     

Serological survey of Babesia bovis and Babesia bigemina in cattle in South Africa

A total of 719 serum samples collected from clinically healthy cattle from eight provinces located in different districts of South Africa were examined by the indirect enzyme-linked immunosorbent assay (ELISA) and the standard indirect fluorescent antibody test (IFAT) to determine the serological prevalence of Babesia bovis and Babesia bigemina. The results showed that 35.3% and 39.7% of cattle were positive for B. bovis and 30% and 36.5% were positive for B. bigemina antibodies on ELISA and IFAT, respectively. Mixed infections were detected in 18.2% and 26.3% of the samples using ELISA and IFAT, respectively. Consequently, the ELISAs with recombinant B. bovis spherical body protein-4 (BbSBP-4) and B. bigemina C-terminal rhoptry-associated protein-1 (BbigRAP-1/CT) were proven to be highly reliable in the serological diagnoses of bovine babesiosis in South African cattle, as evidenced by the significant concordance rates when the results were compared to those of IFAT. Moreover, the serological prevalence was significantly different among the tested provinces, in which the ranges exhibited between 15% and 73% for B. bovis infection and between 13% and 54% for B. bigemina infection. High sero-positive rates were present in Mpumalanga and KwaZulu-Natal provinces, while the lowest rate was in the North West province. Our data provide important information regarding the current seroprevalence of bovine babesiosis in South Africa, which might be beneficial in developing rational strategies for disease control and management.     

基于WebGIS构建区域农业资源信息发布系统

农业资源信息具有明显的空间信息特征,主要表现为空间性、时序性和分布性,上述特点决定了农业资源信息的发布需要由网络化空间信息系统--WebGIS支持.基于WebGIS建立的区域农业资源信息发布系统使用ArcSDE建立空间数据库,基于ArcIMS实现农业资源信息的发布,其体系结构由WEB展示层、逻辑事务层、数据存储层和数据管理层等4层组成.系统建成后,可以实现对大量的农业资源信息数据进行有效管理,并能及时、准确地发布多元的农业资源数据,让这些数据为分布在各地的农业相关部门以及农民所知.     

不同基因型和营养对山羊生长性能、胴体品质及肉质的影响

[目的]探讨不同基因型和营养物质在改善老挝山羊的生长性能、胴体特征和肉质中的效果.[方法]采用2×2双因素试验,以本地山羊品种Lat为对照,对Lat与越南Bach Thao公山羊的杂交F1(BT×L)进行比较.从每个基因型中选择30头7月龄的成长公山羊并分成两组,其中一组采用传统饲喂方法即自由放牧,另一组采用改良饲喂方法,即放牧并任意采食木薯渣和矿物砖.试验期间测量山羊平均日增重(ADG),在后期每组选择3只山羊宰杀并测定胴体特性(胴体组成和初分切肉)、肉质(剪切力、肉色、pH、滴水损失率和蒸煮损失率).[结果]杂交山羊F1的平均日增重(60.02 g/头)明显高于本地山羊(38.45 g/头),增幅为56.09%;饲喂补充木薯渣和矿物砖的山羊平均日增重(55.45 g/头)则显著高于未添加对照组(43.02 g/头),增幅为28.89%.杂交繁育和饲喂补充物对山羊胴体品质如屠宰率、前肢百分率、后肢百分率及胸肌率没有显著影响,但杂交F1山羊的脖子极显著大于本地山羊,而其腰腹部切口极显著小于本地山羊.在两种不同饲喂管理条件下,Lat和杂交F1山羊的肉质特性没有显著差异.[结论]老挝本地山羊Lat与Bach Thao公山羊杂交及在饲料中补充木薯渣和矿物砖,可提高山羊肉产量且对其肉质无任何负作用.     

Fastener-style Formwork Support System Initial Imperfection Classification and Defect Sensitivity Analysis

For the ultimate bearing capacity of steel tubular scaffold with couplers, influences and computation methods considering initial imperfections are analyzed in this paper. Initial imperfections are classified into four type defects: mechanical defects, ma