全文获取类型
收费全文 | 398篇 |
免费 | 18篇 |
国内免费 | 12篇 |
专业分类
电工技术 | 3篇 |
综合类 | 12篇 |
化学工业 | 8篇 |
金属工艺 | 7篇 |
机械仪表 | 7篇 |
建筑科学 | 2篇 |
矿业工程 | 2篇 |
能源动力 | 3篇 |
轻工业 | 30篇 |
水利工程 | 5篇 |
石油天然气 | 6篇 |
无线电 | 15篇 |
一般工业技术 | 8篇 |
冶金工业 | 297篇 |
原子能技术 | 4篇 |
自动化技术 | 19篇 |
出版年
2022年 | 2篇 |
2020年 | 1篇 |
2019年 | 2篇 |
2018年 | 2篇 |
2017年 | 5篇 |
2015年 | 1篇 |
2014年 | 4篇 |
2013年 | 4篇 |
2012年 | 8篇 |
2011年 | 7篇 |
2010年 | 6篇 |
2009年 | 7篇 |
2008年 | 8篇 |
2007年 | 8篇 |
2006年 | 4篇 |
2005年 | 10篇 |
2004年 | 7篇 |
2003年 | 3篇 |
2002年 | 14篇 |
2001年 | 5篇 |
2000年 | 2篇 |
1999年 | 5篇 |
1998年 | 70篇 |
1997年 | 57篇 |
1996年 | 40篇 |
1995年 | 20篇 |
1994年 | 16篇 |
1993年 | 20篇 |
1992年 | 5篇 |
1991年 | 1篇 |
1990年 | 1篇 |
1989年 | 1篇 |
1988年 | 5篇 |
1987年 | 1篇 |
1983年 | 1篇 |
1982年 | 3篇 |
1980年 | 5篇 |
1978年 | 2篇 |
1977年 | 12篇 |
1976年 | 49篇 |
1975年 | 3篇 |
1971年 | 1篇 |
排序方式: 共有428条查询结果,搜索用时 15 毫秒
41.
Beta-thalassemia in Iran: a high incidence of the nonsense codon 39 mutation on the island of Queshm
MR Noori-Daloii N Moazami S Farhangi A Atalay IN Geren L Akar EO Atalay B Cirakoglu E Bermek 《Canadian Metallurgical Quarterly》1994,18(6):449-453
Optic disc blood flow velocity was measured in healthy patients, those with primary open angle glaucoma (POAG), and patients with normal pressure glaucoma (NPG). The velocity of the red blood cells (RBCs) in the capillaries of the optic nerve head (ONH) has been measured with a laser Doppler velocimeter (LDV), and blood viscosity has been evaluated notably by determining the aggregability of the RBCs with an erythroaggregameter. Our results in POAG patients and NPG patients showed that their optic nerve blood flow velocity was reduced and that the aggregability of the RBCs was increased. The hyperaggregability of the erythrocytes is responsible for the increase of the local viscosity in the papillary capillary network. These haemodynamic modifications observed in patients with glaucoma support the hypothesis of a vasogenic mechanism that could impair the optic nerve in glaucoma patients. 相似文献
42.
CE Contreras IN Ploton RF Siliciano CL Karp R Viscidi N Kumar 《Canadian Metallurgical Quarterly》1998,66(8):3579-3590
We have characterized HLA-DR-restricted T-cell epitopes on the 27-kDa protein (Pfg27), a sexual stage-specific antigen, of the human malaria parasite Plasmodium falciparum in subjects with a history of malaria. Pfg27, expressed early in the sexual stages, is recognized by monoclonal antibodies capable of reducing the infectivity of gametocytes in mosquitoes. By using 16 Pfg27-specific CD4(+)-T-cell clones derived from three donors, seven different T-cell epitopes were identified. Among them, P11 (amino acids 191 to 210 of the Pfg27 sequence, IDVVDSYIIKPIPALPVTPD) was found to contain a previously described binding motif for multiple HLA-DR allotypes. Indeed, P11 was found to be promiscuous in that it could be recognized by T cells in the context of at least five different HLA-DR molecules. The cytokine profile of the clones was mixed. Seven of nine T-cell clones exhibited a Th0-like cytokine profile, producing high levels of gamma interferon (IFN-gamma) and interleukin-4 (IL-4) upon stimulation with specific peptides and mitogens. The other two clones had a Th1-like cytokine profile with high expression of IFN-gamma and no IL-4. Identification of a promiscuous epitope in Pfg27 could play a significant role in the design of a subunit vaccine for suppressing malaria transmission. 相似文献
43.
44.
45.
46.
47.
48.
49.
S Muzaffar IN Soomro N Kayani S Siddiqui YA Husein R Jooma 《Canadian Metallurgical Quarterly》1998,48(5):148-149
During my nursing career, I remember constantly being aware of patients who needed some emotional help--those who were frightened about a forthcoming operation, those who were shocked and despairing after being given their diagnosis and prognosis, others who were down in the dumps because they couldn't go home as soon as they had hoped. There were also the 'ward clowns' who tried to make everyone laugh with their good humour and little pranks, yet felt no less anxious, worried or depressed than anyone else. Patients seem to fit into categories: the nervous ones, the depressives, the jovial types, the moaners, those who demand attention and those who shun it. I feel sure that every nurse has noticed the different 'types' of people who fill hospital beds-ordinary people who seem to take on a new persona as soon as they get into their pyjamas and become a 'patient'. Somehow, their identity gets folded up and put away in their locker along with their outdoor clothes and other reminders of the outside world. 相似文献
50.