نتایج جستجو برای: sport lawn
تعداد نتایج: 26904 فیلتر نتایج به سال:
We study the problem of finding shortest tours/paths for “lawn mowing” and “milling” problems: Given a region in the plane, and given the shape of a “cutter” (typically, a circle or a square), find a shortest tour/path for the cutter such that every point within the region is covered by the cutter at some position along the tour/path. In the milling version of the problem, the cutter is constra...
A patient presented with tetanus ten days after blunt trauma with a lawn mower. Our case describes the diagnosis and treatment of this patient with an infectious disease commonly seen in the developing world but rarely seen in the developed world.
Lawn mower-related injuries to children are relatively common and can result in severe injury or death. Many amputations during childhood are caused by power mowers. Pediatricians have an important role as advocates and educators to promote the prevention of these injuries.
The design objective is to come up with a mower that is portable, durable, easy to operate and maintain. It also aims to design a selfpowered mower of electrical source; a cordless electric lawn mower. The heart of the machine is a battery-powered dc electric motor. It comprises of a system of speed multiplication pulleys which drive the cutting blades and the charging unit comprising of a 12V ...
A recent study by Hayes et al. (J. Natl. Cancer. Inst., 83: 1226-1231, 1991) found an increased risk of malignant lymphoma associated with exposure to 2,4-dichlorophenoxyacetic acid (2,4-D) in pet dogs. We conducted a study to determine the extent to which dogs absorb and excrete 2,4-D in urine after contact with treated lawns under natural conditions. Among 44 dogs potentially exposed to 2,4-D...
Various N fertilizer sources are available for lawn turf. Few field studies, however, have determined the losses of nitrate (NO(3)-N) from lawns receiving different formulations of N fertilizers. The objectives of this study were to determine the differences in NO(3)-N leaching losses among various N fertilizer sources and to ascertain when losses were most likely to occur. The field experiment...
Hand operation accompanied with any combination of large forces, awkward positions and repetition may lead to upper limb injury or illness and may be exacerbated by vibration. Commercial lawn mowers expose operators to these factors during actuation of hand controls and therefore may be a health concern. A nontraditional lawn mower control system may decrease upper limb illnesses and injuries t...
Rationale Ground ivy is a stoloniferous, perennial weed that can persist in turf. Growing at soil level, stolons infiltrate surrounding vegetation and establish new populations, which result in non-uniform turf. Approximately 62,000 lbs of 2,4-D were applied to Indiana homelawns in 1992.. A 2001 survey of Indiana lawn care operators (LCO) found 79% of respondents used 2,4-D either alone or in c...
A sensitive lawn-based format has been developed to screen bead-tethered combinatorial chemical libraries for antimicrobial activity. This method has been validated with beads linked to penicillin V via a photocleavable chemical linker in several analyses including a spike-and-recover experiment. The lawn-based screen sensitivity was modified to detect antibacterial compounds of modest potency,...
Fall-risk factors were compared between older women who regularly participate in lawn bowls and controls. Participants were 74 healthy women age 60-75 yr. Postural stability, timed up-and-go score, isometric knee-extensor strength, reaction time, range of motion, and calcaneal broadband ultrasonic attenuation (BUA) were assessed. Bowlers and controls were similar in regard to mean age, height, ...
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