The cultivation of vegetables in greenhouses is characterised by high planting density and environmental conditions that favour the development pests diseases. These are mainly controlled using plant protection products applied with a hand-held sprayer. This inefficient low-tech equipment difficult to calibrate. study evaluates one spray gun two lances widely used greenhouse vegetable crops. te...

Parturition time has been chosen to investigate whether a photoinducible phase exists during the light-dark cycle in the rat. A 1-hr light stimulation was given during the dark phase at various times after the beginning of the principal photoperiod or conventional dawn. The rats kept under 8 hrs of light and 16 hrs of darkness from mating (day 1 of pregnancy) gave birth to most of their pups on...

This paper describes new procedures for processing data acquired with 4C seismic sensors distributed as horizontal arrays on the seafloor and seismic sources positioned either at the sea surface or on the seafloor. Two types of images can be produced from 4C seismic data: a P-P image and a P-SV (converted-shear) image. For P-P imaging, the large elevation difference between deep-water seafloor ...

Gun violence imposes significant costs on children, families, and American society as a whole. But these costs can be difficult to quantify, as much of the burden of gun violence results from intangible concerns about injury and death. This article explores several methods for estimating the costs of gun violence. One method is to assess how much Americans would be willing to pay to reduce the ...

This review paper reports various concepts of the gun propulsion system to meet the goal of the futuristic hypervelocity projectiles. The nonconventional concepts, such as liquid gun propellant, rail gun, coil gun, electrothermal gun, electrothermal chemical gun along with conventional energetic solid gun propellant have been discussed. Even though muzzle velocity around 2000 m/s has been claim...

In addressing the shape of appropriate gun policy, this essay assumes for the sake of discussion that there is a legal and moral right to private gun ownership. My thesis is that, against the background of this right, the most defensible policy approach in the United States would feature moderate gun control. The first section summarizes the American gun control status quo and characterizes wha...