In view of the deformation and instability law hard roof without side filling retaining roadway, based on systematic construction analysis force bearing model roadway structure, this article proposes control mechanical calculation method retaining, which takes anchor beam key block above to form cantilever together, with solid coal as foundation support. The research practice show that under co...

Coal auger mining is a promising technology used for excavating thin coal seams. The efficiency of largely related to the stability mine roadways in influence zone coal-face. Roof bolting systems are such conditions. An adequate choice roof parameters only possible if one understands features stratification rocks and stages deformation array mining. Modern monitoring methods condition based on ...

Abstract: The objective of this work was to determine the genetic parameters and efficiency different selection indices for biofortified red leaf lettuce (Lactuca sativa var. crispa) lines with agronomic nutritional potential. experiment carried out in a randomized complete block design three replicates 31 crisp-textured red-tinted genotypes: Belíssima cultivar, low carotenoid content rich anth...

Life cycle adaptation to latitudinal and seasonal variation in photoperiod and temperature is a major determinant of evolutionary success in flowering plants. Whereas the life cycle of the dicotyledonous model species Arabidopsis thaliana is controlled by two epistatic genes, FLOWERING LOCUS C and FRIGIDA, three unrelated loci (VERNALIZATION) determine the spring and winter habits of monocotyle...

PROBLEM Operators of roof bolting machines in underground coal mines do so in confined spaces and in very close proximity to the moving equipment. Errors in the operation of these machines can have serious consequences, and the design of the equipment interface has a critical role in reducing the probability of such errors. METHODS An experiment was conducted to explore coding and directional...

A mutant of Arabidopsis with reduced internodal cell length, acaulis5 (acl5), has recently been shown to have reduced transcript levels of a gene for endoxyloglucan transferase, EXGT-A1 (Y. Hanzawa, T. Takahashi, Y. Komeda [1997] Plant J 12: 863-874). In the present study, we cloned genomic fragments of five members of the EXGT gene family, EXGT-A1, EXGT-A3, EXGT-A4, XTR2, and XTR3, and examine...

Composites are being used extensively in several engineering applications. However, the efficiency of the joints used in joining composites and metals can be improved. To move towards a sustainable and environment friendly future, natural fibre composite material was used. Towards the above objective, research work was carried out for the assembly between a composite and aluminium. Three differ...