abstract to optimal use of available water, irrigation scheduling is important to over scarcity of water resources in arid and semi-arid area. in this research to estimate of maximum allowable deficit (or: management allowed depletion) and irrigation scheduling of fodder mays based on canopy-air temperature difference, a field study was conducted in agricultural faculty of karaj. the lower limi...

Abstract Borehole collapse will pose a threat to the safety of equipment and personnel during drilling operation. In this paper, finite element multi-field coupling model for investigating borehole in hydrate reservoir was developed. model, fluid seepage, heat transfer, dissociation deformation are all considered. Based on which, effects density both investigated. The investigation results show...

background: welding emits harmful rays to the eyes. we evaluate and compare the uv, blue light and ir transmittance characteristics of some currently available welding safety protectors with ansi z87.1 criteria. materials and methods: three type of welding safety protectors (three of each type) have been evaluated for spectral transmittance. one-sample t-test was performed to establish is there...

A design algorithm is derived, for a calculating minimum allowable electrical clearances in alternating and direct current “permissible” equipments, which are authorized to operate in gassy mines and tunnels under Part 18 of Title 30, Code of Federal Regulations [1]. The calculated clearances apply to operations at altitudes ranging up to 12 000 ft (3658 m) above sea level. The minimum allowabl...

DriviNG eGaN® FETs When considering gate drive requirements, the three most important parameters for eGaN FETs are (1) the maximum allowable gate voltage, (2) the gate threshold voltage, and (3) the “body diode” voltage drop. The maximum allowable gate-source voltage for an eGaN FET of 6 V is low in comparison with traditional silicon. Secondly, the gate threshold is also low compared to most p...

DRIVING eGaN® FETS When considering gate drive requirements, the three most important parameters for eGaN FETs are (1) the maximum allowable gate voltage, (2) the gate threshold voltage, and (3) the “body diode” voltage drop. The maximum allowable gate-source voltage for an eGaN FET of 6 V is low in comparison with traditional silicon. Secondly, the gate threshold is also low compared to most p...

Airborne dust bioaerosols, ammonia and formaldehyde levels were determined inside two different (ventilated and unventilated) wood working shops. Airborne dust was found at mean values of 4.3 and 3.01 mg m(-3). These levels were higher than that recommended by Egyptian environmental law [1 mg m(-3) indoor maximum allowable concentration (MAC) for hard wood]. The highest frequency of aerodynamic...

The stability of a high 3 tokamak with a superimposed single helicity stellarator field is investigated in the context of the sharp boundary surface current model. The analysis treats external ideal magnetohydrodynamic modes including both pressure-driven ballooning effects and current-driven kink instabilities. The results show that the addition of an i = 2 field is unfavorable, lowering the a...

A safety harness system is essential to ensure participant safety in experiments at the threshold of balance recovery where avoiding a fall is not always possible. The purpose of this study was to propose a method to determine the maximum allowable force on a safety harness cable to discriminate a successful from a failed balance recovery. Data from 12 younger adults, who participated in experi...