The Taxodium hybrid Zhongshanshan fast-growing species is susceptible to environment and gravity form reaction wood. In this study, individual growth rings of wood are used as subjects, an ring divided into three zones: compression zone (CZ), lateral (LZ), opposite (OZ). microanatomical structure chemical properties the tracheids in CZ, LZ, OZ forms by inclined or bent T. comparatively analyzed...

Anthropogenic activities are altering the structure and functioning of forests their services to society. However, we know little about degree which such changing health through edge effects in fragmented different regions world. The present study was carried out Minkong Community Reserve Forest Nagaland (North-east India) with aim determine anthropogenic on floristic composition diversity, pop...

The purpose of this paper is to provide scientific basis for the stability evaluation overburden rock repeated mining goaf under expressway. objectives present study are reveal development fractures and identify fractal characteristics fractures. results show that (1) separation fracture vertical fissure developed in mining; (2) after lower coal seam, obviously retained general. number on both ...

JCB • VOLUME 171 • NUMBER 3 • 2005 406 Divided identities in the niche o maintain a stem cell niche at a fixed size, the niche exerts control over both cell differentiation (how many cells functionally leave the niche) and cell division. G. Venugopala Reddy and Elliot Meyerowitz (Caltech, Pasadena, CA) now show that, in the growing shoots of plants, these two control points are separable in bot...

Asphalt concrete (AC) is a composite material consisting of binder, aggregates and air voids. The quantitative effect aggregate-to-aggregate contact on the mechanical performance AC an important complex issue, which has not been fully understood yet. To fill this gap, study aims to characterize aggregate contacts in evaluate their effects viscoelastic behavior through micromechanical finite ele...

A combined finite-discrete element method (FDEM) is proposed to model the dynamic fracture, fragmentation, and resultant muck-piling process during mining production by blast in underground mine. The key component of method, that is, transition from continuum discontinuum through fracture introduced detail, which makes superior continuum-based finite discontinuum-based discrete method. FDEM cal...

Estimation of the height of caved and fractured zones above a longwall panel along with the stability conditions of the goaf area are very crucial to determine the abutment stresses, ground subsidence, and face support as well as designing the surrounding gates and intervening pillars. In this work, the height of caving-fracturing zone above the mined panel is considered as the height of destre...

A strain of Mexican Boophilus microplus (Cz) collected near Coatzacoalcos, Veracruz, Mexico, exhibits a moderate, but significant, level of permethrin resistance. Unlike other highly permethrin resistant strains, the Cz strain does not have a mutation within the sodium channel gene that results in target-site insensitivity. However, the Cz strain possesses a substantial increase in general and ...

The cavability assessment of rock mass cavability and indicating the damage profile ahead of a cave-back is of great importance in the evaluation of a caving mine operation, which can influence all aspects of the mine operation. Due to the lack of access to the caved zones, our current knowledge about the damage profile in caved zones is very limited. Among the different approaches available, p...

The migration law of overlying strata on working face is great significance for safe mining face. In this paper, theoretical calculation, numerical simulation, and similar simulation are used to study the distribution characteristics, migration, fracture key in 130204 Y.C.W coal mine relationship between development height water flowing fractured zone spatial position weak aquifer. calculation ...