首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   96篇
  免费   2篇
林业   2篇
农学   9篇
  1篇
综合类   12篇
农作物   9篇
水产渔业   7篇
畜牧兽医   49篇
园艺   1篇
植物保护   8篇
  2016年   2篇
  2014年   1篇
  2013年   3篇
  2011年   1篇
  2010年   3篇
  2009年   1篇
  2008年   3篇
  2007年   1篇
  2006年   1篇
  2005年   3篇
  1999年   2篇
  1998年   5篇
  1997年   4篇
  1996年   1篇
  1995年   1篇
  1994年   5篇
  1993年   4篇
  1992年   2篇
  1991年   1篇
  1990年   1篇
  1989年   4篇
  1988年   2篇
  1987年   3篇
  1986年   4篇
  1985年   1篇
  1983年   3篇
  1982年   1篇
  1980年   5篇
  1979年   2篇
  1978年   4篇
  1977年   1篇
  1976年   1篇
  1975年   2篇
  1972年   3篇
  1971年   1篇
  1969年   1篇
  1963年   2篇
  1960年   1篇
  1959年   2篇
  1958年   2篇
  1957年   2篇
  1955年   2篇
  1954年   1篇
  1951年   1篇
  1950年   1篇
  1946年   1篇
排序方式: 共有98条查询结果,搜索用时 453 毫秒
11.
12.
ABSTRACT Hong Kong, Singapore, Korea, and Taiwan (the Asian newly industrialized economies [NIEs]) were the economic success stories of the 1970s and 1980s. While there are a number of competing explanations for their rapid growth, some focusing upon the process of export-led development, the Asian NIEs face a more hostile global competitive environment than heretofore acknowledged. Their competitiveness in labor-intensive and traded-goods manufactured industries has been undermined by new competitors including the ASEAN countries of Indonesia, Malaysia, Thailand, and the Philippines, as well as China. With new competitors, the rise of trading blocs, and the shrinkage of export surpluses (over imports) it is doubtful if the NIEs will be able to sustain past rates of growth over the coming years. The capacity to adjust efficiently to changing circumstances has become a vital determinate of long-term growth of the NIEs. Whatever the virtues of past state-based industrial policies, restructuring is now a very important part of the life of firms in the NIEs’labor-intensive industries. Moreover, the significance of these industries in each of the NIEs has been undercut by the growing importance of the global finance industry and its attendant political economy.  相似文献   
13.
ABSTRACT The Arizona Community Data Set (ACDS) now contains the results of 40 separate establishment-level, community-wide surveys. These communities can be classified into different functional types, and OLS regression models can be used to explore the relationships among community functions, levels of public transfer payments, and magnitudes of economic base multipliers. The statistical analysis suggests that employment-derived estimates of the base multiplier tend to be biased upward unless transfer payments are specified in the model.  相似文献   
14.
Complications of celiotomy incisions were evaluated retrospectively in 274 horses that survived at least 1 month after surgery, or died or were euthanatized within 1 month of surgery, as a direct result of these complications. Horses were divided into four groups; group A, a ventral median celiotomy for intestinal disease; group B, ventral median celiotomy for nonintestinal disease; group C, repair of an umbilical hernia; and group D, celiotomy in a region other than the midline. Specific incisional complications were peri-incisional edema, drainage, incisional abscess, suture sinus, and dehiscence. Incision-related complications occurred in 30% of the horses (group A, 40%; group B 18%; group C, 7%; and group D, 88%). Complications occurred more frequently in group D than group A ( P =.009), which were higher than in groups B and C ( P <.00001). Incisional hernia occurred in 28 of 256 (11%) horses that survived at least 4 months and were available for follow-up. Hernia formation was more common ( P <.00001) in horses that had other incisional complications (23 horses) than those without (5 horses). Serous or purulent incisional drainage, were more likely to be associated with hernia formation than was serosanguineous drainage or other incisional complications.  相似文献   
15.
Disease of geese caused by a new herpesvirus   总被引:3,自引:0,他引:3  
A goose flock farmed outdoors in south-eastern Queensland suffered an outbreak of peracute disease with high death rate (97%). Small button ulcers and large plaques overlying lymphocyte aggregates were present on the mucosa of the small intestine of affected birds. Small white foci of necrosis and focal haemorrhages were seen in the livers. Numerous intranuclear inclusion bodies were observed microscopically in hepatocytes and a herpesvirus which grew rapidly in chicken kidney cells was isolated from tissues. Duck virus enteritis (DVE) was suspected but DVE antiserums failed to neutralise the virus. Further serological studies with a limited range of known avian herpesviruses have failed to identify the virus. Experimental transmission resulted in high mortality in geese (100%), lower mortality in ducklings and nil mortality in chickens. Surveillance studies showed no evidence of infection in domestic and wild birds beyond the original farm and the infection appears not to have been established in the area. Wild ducks, which were frequent visitors to the farm dam, were considered the most likely source of the infection.  相似文献   
16.
17.
18.
19.
20.
Forty-two cats underwent craniotomy for removal of a meningioma between 1985 and 1991. Median duration of clinical signs before examination was 1.25 months. All cats had inappropriate demeanor: 48% were dull and 38% were lethargic. Neurological deficits included impaired vision in 93%, paresis in 83%, and seizures in 19%. Computed tomography (CT) showed solitary masses in 86% and multiple masses in 14%. Intraoperative complications included hemorrhage and difficulty excising deep or adherent masses. Anemia in 13 of 42 cats was the most common immediate postoperative complication. Ten of 42 cats had no improvement or a more severe neurological status after surgery. Eight of 42 cats died immediately after surgery; 6 of these were anemic. Of the cats that survived the immediate postoperative period, evaluation 10 to 14 days after surgery showed that 97% (33 of 34) were alert and 79% (27 of 34) had returned to normal behavior. Neurological deficits, except for vision impairment, had resolved in most cats. The duration of follow-up varied from 1.3 months to 55.1 months. Ten cats developed neurological abnormalities from 1 month to 44.2 months after surgery; of these, 6 had tumor recurrence or new growth confirmed by CT scan or necropsy. Overall survival was 71% at 6 months, 66% at 1 year, and 50% at 2 years. Age of cat and location of tumor did not significantly affect survival ( P = . 1034 and .1851, respectively). There were too few precise measurements of tumor size to make a valid statistical comparison of the effect of size on survival. Location or presence of multiple tumors did not affect final outcome. Results of this study indicate that surgical excision is a beneficial method of treatment of cranial meningioma in cats.  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号