全文获取类型
收费全文 | 3475篇 |
免费 | 46篇 |
国内免费 | 11篇 |
专业分类
电工技术 | 20篇 |
综合类 | 2篇 |
化学工业 | 237篇 |
金属工艺 | 12篇 |
机械仪表 | 16篇 |
建筑科学 | 26篇 |
能源动力 | 45篇 |
轻工业 | 71篇 |
水利工程 | 6篇 |
石油天然气 | 12篇 |
武器工业 | 1篇 |
无线电 | 120篇 |
一般工业技术 | 166篇 |
冶金工业 | 2652篇 |
原子能技术 | 3篇 |
自动化技术 | 143篇 |
出版年
2024年 | 3篇 |
2023年 | 21篇 |
2022年 | 50篇 |
2021年 | 52篇 |
2020年 | 41篇 |
2019年 | 44篇 |
2018年 | 62篇 |
2017年 | 39篇 |
2016年 | 46篇 |
2015年 | 36篇 |
2014年 | 43篇 |
2013年 | 59篇 |
2012年 | 38篇 |
2011年 | 35篇 |
2010年 | 32篇 |
2009年 | 27篇 |
2008年 | 34篇 |
2007年 | 20篇 |
2006年 | 18篇 |
2005年 | 15篇 |
2004年 | 15篇 |
2003年 | 24篇 |
2002年 | 15篇 |
2001年 | 11篇 |
2000年 | 12篇 |
1999年 | 88篇 |
1998年 | 823篇 |
1997年 | 467篇 |
1996年 | 302篇 |
1995年 | 160篇 |
1994年 | 146篇 |
1993年 | 164篇 |
1992年 | 28篇 |
1991年 | 36篇 |
1990年 | 31篇 |
1989年 | 40篇 |
1988年 | 39篇 |
1987年 | 34篇 |
1986年 | 29篇 |
1985年 | 31篇 |
1984年 | 6篇 |
1983年 | 10篇 |
1982年 | 18篇 |
1981年 | 14篇 |
1980年 | 17篇 |
1979年 | 4篇 |
1978年 | 8篇 |
1977年 | 59篇 |
1976年 | 176篇 |
1959年 | 4篇 |
排序方式: 共有3532条查询结果,搜索用时 15 毫秒
101.
RS Hamas 《Canadian Metallurgical Quarterly》1995,19(1):21-25
A prospective study concerning colorectal polyps in symptomatic patients was held at Lima, Perú, an area considered of low incidence for colorectal neoplasia. In 137 patients, 272 polyps were resected by colonoscopic polypectomy or surgery. 55.9% were adenomas, 40.4% non neoplastic polyps and 3.7% polypoid carcinomas. The distribution of polyps, and the incidence of dysplasia and malignant changes in the adenomas, were similar of that reported in areas with high incidence of colorectal cancer. A high proportion of patients with adenomas (21.4% had a synchronous advanced carcinoma, specially if there were multiple adenomas. The figure was lower in patients with only non neoplastic polyps (7.5%). There were no cases of "de novo" carcinoma. This evidence suggest that adenomas play an essential role in colorectal cancer histogenesis, even in areas of low incidence of this neoplasia. 相似文献
102.
Razzaq Saad Shah Babar Iqbal Farkhund Ilyas Muhammad Maqbool Fahad Rocha Alvaro 《Neural computing & applications》2023,35(11):8017-8026
Neural Computing and Applications - A lot of different methods are being opted for improving the educational standards through monitoring of the classrooms. The developed world uses Smart... 相似文献
103.
The extent of the peril associated with cancer can be perceived from the lack of treatment, ineffective early diagnosis techniques, and most importantly its fatality rate. Globally, cancer is the second leading cause of death and among over a hundred types of cancer; lung cancer is the second most common type of cancer as well as the leading cause of cancer-related deaths. Anyhow, an accurate lung cancer diagnosis in a timely manner can elevate the likelihood of survival by a noticeable margin and medical imaging is a prevalent manner of cancer diagnosis since it is easily accessible to people around the globe. Nonetheless, this is not eminently efficacious considering human inspection of medical images can yield a high false positive rate. Ineffective and inefficient diagnosis is a crucial reason for such a high mortality rate for this malady. However, the conspicuous advancements in deep learning and artificial intelligence have stimulated the development of exceedingly precise diagnosis systems. The development and performance of these systems rely prominently on the data that is used to train these systems. A standard problem witnessed in publicly available medical image datasets is the severe imbalance of data between different classes. This grave imbalance of data can make a deep learning model biased towards the dominant class and unable to generalize. This study aims to present an end-to-end convolutional neural network that can accurately differentiate lung nodules from non-nodules and reduce the false positive rate to a bare minimum. To tackle the problem of data imbalance, we oversampled the data by transforming available images in the minority class. The average false positive rate in the proposed method is a mere 1.5 percent. However, the average false negative rate is 31.76 percent. The proposed neural network has 68.66 percent sensitivity and 98.42 percent specificity. 相似文献
104.
MD Dake DC Miller RS Mitchell CP Semba KA Moore T Sakai 《Canadian Metallurgical Quarterly》1998,116(5):689-703; discussion 703-4
OBJECTIVE: Our goal was to determine whether endovascular stent-grafting is feasible and effective for patients with aneurysms of the descending thoracic aorta. METHODS: Starting in July 1992, we conducted a prospective, uncontrolled clinical trial in 103 patients (mean age 69 years [range 34-89 years]) who underwent endovascular treatment of aneurysms of the descending thoracic aorta using a custom-fabricated, self-expanding stent-graft device. Follow-up was 100% complete and averaged 22 months. Sixty-two patients (60%) were judged not to be reasonable candidates for a conventional "open" surgical procedure. RESULTS: Complete thrombosis of the aneurysm was ultimately achieved in 86 (83%) patients. The early mortality rate was 9% +/- 3% (+/- 70% CL). Multivariable analysis revealed that myocardial infarction or stroke was linked with a higher likelihood of early death (P = .001). Early serious complications included paraplegia in 3% +/- 2% and stroke in 7% +/- 3%. Actuarial survival estimates at 1 year and 2 years were 81% +/- 4% and 73% +/- 5% (+/- 1 SE), respectively; being judged not to be a surgical candidate portended a higher probability of death (P = .003). According to the intent-to-treat principle, "treatment failure" (including all late sudden unexplained deaths) occurred in 38 patients; 53% +/- 10% of patients were free from treatment failure at 3.7 years. Stent-graft related complications occurred commonly and were linked with several anatomic, technical, and patient-related risk factors. CONCLUSIONS: This 5-year clinical trial involving use of a "first generation" device indicates that endovascular stent-grafting of descending thoracic aortic aneurysms is feasible with acceptable medium-term results. More refined, commercially developed devices available today offer less traumatic and more precise stent-graft deployment; these major technical advantages, coupled with important lessons we have learned over time and better patient selection, should be associated with more salutary clinical results in the future. 相似文献
105.
Increasing numbers of children are living in families consisting of grandparents and grandchildren. This paper presents findings of a study in which 123 caregiving grandmothers were interviewed. Fifty-eight percent of these grandmothers were "career caregivers," whose homes were always filled with a child or grandchild. Most of them were in good to excellent physical health and their mental health was at least as good as that of a national sample. Regression analyses found that having a life-threatening physical condition, being younger and white explained psychological anxiety; and having a life-threatening physical condition and not being employed explained psychophysiological mental health symptoms. These findings suggest that some grandmothers are at risk for mental health symptoms and raise questions about the implications of caregiving of grandchildren for women. 相似文献
106.
SR DeMeester GA Patterson RS Sundaresan JD Cooper 《Canadian Metallurgical Quarterly》1998,115(3):681-688
Methanol-induced conformational transitions of hen egg white lysozyme were investigated with a combined use of far- and near-UV CD and NMR spectroscopies, ANS binding and small-angle X-ray scattering. Addition of methanol induced no global change in the native conformation itself, but induced a transition from the native state to the denatured state which was highly cooperative, as shown by the coincidence of transition curves monitored by the far- and near-UV CD spectroscopy, by isodichroic points in the far- and near-UV CD spectra and by the concomitant disappearance of individual 1H NMR signals of the native state. The ANS binding experiments could detect no intermediate conformer similar to the molten globule state in the process of the methanol denaturation. However, at high concentration of methanol, e.g., 60% (v/v) methanol/water, a highly helical state (H) was realized. The H state had a helical content much higher than the native state, monitored by far-UV CD spectroscopy, and had no specific tertiary structure, monitored both by near-UV CD and NMR spectroscopy. The radius of gyration in the H state, 24.9 angstroms, was significantly larger than that in the native state (15.7 angstroms). The Kratky plot for the H state did not show a clear peak and was quite similar to that for the urea-denatured state, indicating a complete lack of globularity. Thus we conclude that the H state has a considerably expanded, flexible broken rod-like conformation which is clearly distinguishable from the "molten globule" state. The stability of both N and H states depends on pH and methanol concentration. Thus a phase diagram involving N and H was constructed. 相似文献
107.
M Tarquino RL Geggel RS Strauss J Rhodes B Wunderlich RJ Rohrer 《Canadian Metallurgical Quarterly》1998,37(8):505-509
Accusations of rape or sexual harassment are currently very high-profile in the military. This article discusses rape allegations in the military legal system from a psychiatric perspective. The original definition of "rape trauma syndrome" and subsequent psychiatric thinking about the diagnosis are briefly outlined. Common reactions seen in military victims in this era are described. A prototypical military case is presented. An adequate evaluation of an alleged victim is outlined. Credentials and preparation of an expert witness are also briefly discussed, with cautions about the use of expert testimony in cases of alleged sexual assault and rape trauma syndrome. 相似文献
108.
AJ Parkinson WS Parkinson RS Tyler MW Lowder BJ Gantz 《Canadian Metallurgical Quarterly》1998,41(5):1073-1087
Sixteen experienced cochlear implant patients with a wide range of speech-perception abilities received the SPEAK processing strategy in the Nucleus Spectra-22 cochlear implant. Speech perception was assessed in quiet and in noise with SPEAK and with the patients' previous strategies (for most, Multipeak) at the study onset, as well as after using SPEAK for 6 months. Comparisons were made within and across the two test sessions to elucidate possible learning effects. Patients were also asked to rate the strategies on seven speech recognition and sound quality scales. After 6 months' experience with SPEAK, patients showed significantly improved mean performance on a range of speech recognition measures in quiet and noise. When mean subjective ratings were compared over time there were no significant differences noted between strategies. However, many individuals rated the SPEAK strategy better for two or more of the seven subjective measures. Ratings for "appreciation of music" and "quality of my own voice" in particular were generally higher for SPEAK. Improvements were realized by patients with a wide range of speech perception abilities, including those with little or no open-set speech recognition. 相似文献
109.
EP Gerstenfeld Y Balarajan R Cooke RS Mittleman 《Canadian Metallurgical Quarterly》1998,114(2):637-639
A 36-year-old man with a history of hypertrophic obstructive cardiomyopathy presented to the emergency room with "stabbing" chest pain. He had undergone dual-chamber pacemaker implantation in 1993 using an atrial lead (Accufix; Telectronics; Englewood, Colo) and a myomectomy in 1996 during which the distal portion of the atrial lead was removed. Digital fluoroscopy revealed that the retention wire had migrated out of the remaining atrial lead and perforated the right atrium. The retention wire was successfully removed percutaneously. The need for complete removal of the retention wire in the Accufix lead at the time of open-heart surgery is emphasized. 相似文献
110.
ProbExplorer: Uncertainty‐guided Exploration and Editing of Probabilistic Medical Image Segmentation
In this paper, we develop an interactive analysis and visualization tool for probabilistic segmentation results in medical imaging. We provide a systematic approach to analyze, interact and highlight regions of segmentation uncertainty. We introduce a set of visual analysis widgets integrating different approaches to analyze multivariate probabilistic field data with direct volume rendering. We demonstrate the user's ability to identify suspicious regions (e.g. tumors) and correct the misclassification results using a novel uncertainty‐based segmentation editing technique. We evaluate our system and demonstrate its usefulness in the context of static and time‐varying medical imaging datasets. 相似文献