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1.
Natural vegetation on erodible land surfaces, such as the loose sandy soils found in the southwestern United States and in Soviet Central Asia, absorbs part of the wind momentum flux (stress) and thus protects the erodible soil to a degree that depends on the geometry of plant distribution and profile. The sheltering effect of natural plants may be expressed as the ratio, R, of threshold friction velocity for the bare soil (determined in the laboratory or in specially prepared areas of bare soil in the field) to that for the naturally vegetated surface. We used new automated instrumentation to detect erosion thresholds in locations where erosion events are widely separated in time. Measured values of R were low for our most vegetated sites and nearer unity for the sparsely vegetated site. 相似文献
2.
Since its inception, in 1885 the Buckeye Irrigation Canal has delivered irrigation water in the Buckeye Valley, southwest of Phoenix, Arizona. Throughout its tenure the owners of the canal have consulted design professionals for its engineering needs. Early engineering in 1885 established canal alignments, delivery points and channel capacity. Until recently, the Buckeye Valley was a rural area relying on agricultural revenues to drive the local economy. Now, due to the recent housing market boom new homes started springing up like corn in September driving the existing open-channel laterals below grade into a patch work redesigned pipeline system. Because of these changes, professional construction managers are an enormous benefit to the Buckeye Water Conservation and Drainage District (BWCDD), the owner of the canal.As a result of this urbanization, contractors working for home developers are installing irrigation pipelines and systems with the focus of completing the project as quickly and economically as possible. Irrigation providers, on the other hand, focus on meeting the agricultural needs of their clients with consistent and uninterrupted water delivery. The services of a professional construction manager help both entities achieve their respective goals, shield BWCDD from construction of sub-par systems and risk, maintain uninterrupted service to growers and providing the technical expertise to communicate with both BWCDD and contractors.Construction managers provide a number of services to rural irrigation districts under-going urbanization. They team with an irrigation district by:
- Understanding irrigation design concepts;
- Understanding agricultural demands;
- Providing a thorough knowledge of construction practices and standards;
- Creating long-term design functionality;
- Reducing stress on and increasing productivity of personnel;
- Coordinating construction activities with water deliveries;
- Verifying constructed facilities perform as designed, which reduces maintenance costs.
- Reviewing development plans for adherence to current construction standards and practices and coordinates construction schedules with water delivery needs;
- Observing construction for proper installation;
- Clarifying installers understanding of plans and specifications;
- Coordinating interruptions in service;
- Tracking multiple construction projects;
- Explaining agricultural practices to contractor personnel;
- Providing a single point of contact for construction related correspondence.
3.
Ed. Afterberg 《European Journal of Forest Research》1860,4(1):439-441
Ohne Zusammenfassung 相似文献
4.
Eric Klaphake Ahmed Shoieb Ed Ramsay Juergen Schumacher Linden Craig 《Journal of zoo and wildlife medicine》2005,36(1):127-130
A 19-yr-old binturong (Arctictis binturong) with acute upper respiratory disease was euthanized. Postmortem findings included hepatocellular carcinoma, pancreatic islet cell carcinoma, and renal adenocarcinoma with metastasis to the spleen, pleura, and pericardium. A link between primary hepatic and renal neoplasms has been noted in older humans. 相似文献
5.
S I Reinke P J Ihrke J D Reinke A A Stannard S S Jang D M Gillette K W Hallock 《Journal of the American Veterinary Medical Association》1986,189(4):446-448
Actinomycotic mycetoma, a chronic, progressive infection of the subcutaneous tissue characterized by tumefaction, draining sinuses, and grains, was diagnosed in the right hindlimb of a young adult, male cat. The organisms that cause actinomycetoma are soil or plant saprophytes that gain entrance to the skin through abrasion or traumatic implantation. Streptomyces griseus, an organism generally considered to be a saprophyte, was cultured bacteriologically. Despite extensive surgery and long-term antibiotic therapy, the infection persisted, and the cat was euthanatized. 相似文献
6.
Gillette R 《Science (New York, N.Y.)》1971,172(3989):1215-1216
7.
Gillette R 《Science (New York, N.Y.)》1972,177(4055):1172-1175
8.
9.
Gillette R 《Science (New York, N.Y.)》1974,184(4137):650-651
10.
Gillette R 《Science (New York, N.Y.)》1974,184(4141):1053-1055