Inter-specific interactions are important drivers and maintainers of biodiversity. Compared to trophic and competitive interactions, the role of non-trophic facilitation among species has received less attention. Cavity-nesting bees nest in old beetle borings in dead wood, with restricted diameters corresponding to the body size of the bee species. The aim of this study was to test the hypothes...

A classical example of chatter prone machining is the boring operation. Turning under conditions with high vibrations in the cutting tool deteriorates the surface finish and may cause tool breakage. Severe noise is also a consequence of the high vibration levels in the boring bar. Active control is one possible solution to the noise and vibration problem in boring operations. In boring operatio...

It is often an unattainable task to ensure high accuracy of machining hard-to-reach overall equipment when performing repair work outside a machine-building enterprise. Therefore, it currently relevant abandon these operations in favor the use specialized mobile machines, which will significantly reduce cost and time such repairs. Now market widely represented by machines foreign companies for ...

and an increased chlorophyll b to chlorophyll a ratio for better light capture in low light. Furthermore, an Ostreobium strain living in a coral skeleton, where nearly all of the red light has been captured by the zooxanthellae in the coral tissue, has been shown to have modified chlorophyll with a spectrum shifted towards far-red wavelengths. As zooxanthellae cannot use far-red light, more of ...

Model parameters of conditioned soils in head chamber of shield machine are determined based on tri-axial compression tests in laboratory. The loads acting on tunneling face are estimated according to static earth pressure principle. Based on Duncan-Chang nonlinear elastic constitutive model, the earth pressures on head chamber of shield machine are simulated. The variation of earth pressure on...

biology of amaranth stem-boring weevil, hypolixus pica (fabricius) on red root pigweed, amaranthus retroflexus l. was investigated under natural conditions in a citrus orchard in dezful. each red root pigweed was covered by a wooden cage of 50×50×100cm dimentions screened by muslin. three to four adult females and males were introduced into each cage. after 3-4 days past the weevils were remove...