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1.
特洛伊木马隐藏技术分析 总被引:1,自引:0,他引:1
文章首先介绍了木马的定义,概括了木马的特征—隐蔽性、欺骗性、自启动性和自动恢复性,并简单介绍了木马的结构和功能。随后,从文件隐藏、进程隐藏、通信隐藏、芯片隐藏四个方面介绍了木马的隐藏技术,最后展望了木马技术的发展趋势。 相似文献
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本文对特洛伊木马技术所采用的方法进行了分析,介绍了木马程序在植入、加载、隐藏以及在通信方面所采用的方法。在此基础上,分析如何基于动态链接库(DLL)和端口反弹木马技术实现木马程序。最后,给出了防范木马入侵的一般方法。 相似文献
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Object segmentation is a well-known difficult problem in pattern recognition. Until now, most of the existing object segmentation methods need to go through a time-consuming training phase prior to segmentation. Both robustness and efficiency of the existing methods have room for improvement. In this work, we propose a new methodology, called POSIT, for object segmentation without intensive training process. We construct a part-based shape model to substitute the training process. In the part-based framework, we sequentially register object parts in the prior model to an image so that the searching space is largely reduced. Another advantage of the sequential matching is that, instead of predefining the weighting parameters for the terms in the matching evaluation function, we can estimate the parameters in our model on the fly. Finally, we fine-tune the previous coarse segmentation by localized graph cuts. In the experiments, POSIT has been tested on numerous natural horse and cow images and the obtained results show the accuracy, robustness and efficiency of the proposed object segmentation method. 相似文献
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5木马的危害 木马的危害主要表现在远程控制方面。木马连接建立后,控制端端口和木马端口之间将会出现一条通道。 相似文献
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M.C. Cabrera A. Saadoun A. Grompone T. Pagano M. Salhi R. Olivero M. del Puerto 《Food chemistry》2006,98(4):767-773
The present study was conducted to evaluate the ability of horse fat produced in Uruguay, compared with other lipid sources supplemented in the diet of laying hens, to modify the lipid composition and the n − 6/n − 3 fatty acid ratio of the produced eggs. For this purpose, 60 laying hens (Gallus domesticus) were fed for 30 days with five experimental diets (12 hens/diet) containing 3% sunflower oil (SO), rice oil (RO), beef tallow (BT), pressed-fat (PF), obtained by pressing fat from bovine viscera, and horse fat (HF) obtained from horse bone medulla. Throughout the trial, feeding rate, shell index, weight and total lipid contents of eggs, were not affected by the different diets. Feeding on the SO and RO diets significantly increased the amount of linoleic acid of the egg, although it was lower in the RO than in the SO eggs. Diet BT did not affect the saturated fatty acid content of the yolks. The diets with animal fats containing 18:3n − 3 (diets PF and HF), resulted in a significant increase in the n − 3 fatty acid contents of the eggs, through an increase of linolenic (18:3n − 3) and docosahexaenoic acid (DHA, 22:6n − 3) contents. Eggs from hens fed the HF diet showed increased linolenic acid (46 mg/yolk) and DHA (71 mg/yolk, 1.7% of total fatty acids) contents. These levels were obtained after two weeks of feeding. Moreover, the fatty acid profiles of eggs from treatment HF were not significantly affected by thermal treatment of the yolks. In conclusion, the fat from horse bone medulla, as produced in Uruguay, can be considered as a suitable lipid source for diets of laying hens, to modify the nutritional composition of the eggs in n − 3 PUFA content, especially DHA, and consequently, the n − 6/n − 3 fatty acid ratio. 相似文献
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PAULO VAZ-PIRES CHRISTOPHER CAPELL ROY KIRBY 《International Journal of Food Science & Technology》1994,29(4):405-413
The application of heat to reduce the microbial load and extend the lag phase was studied on whole fish and with bacterial isolates from fresh fish in mixed culture. Bacterial isolates obtained from fresh horse-mackerel ( Trachurus trachurus ) were heat treated at 60°C for 20s and stored in nutrient broth on ice. the flora were shown to be heat sensitive and the initial numbers were reduced by over 2.0 log10 cycles. Heating at 60°C extended the lag phase but subsequent growth rates were increased, giving a shelf-life extension of a day and a half. There were no significant effects on visual EC grades of whole fish or on the flavour of cooked fillets. 相似文献
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比较筛选基于聚合酶链式反应(polymerase chain reaction, PCR)技术的马源性成分鉴定方法中高灵敏度和特异性引物。方法 选取来自国标法、专利和文献报道的3组马源性成分鉴定引物, 比较其灵敏度和特异性, 筛选高灵敏度和特异性引物。结果 3组引物的灵敏度和特异性存在差异, 以线粒体DNA为靶标的Ⅱ组马源性成分鉴定引物的特异性和灵敏度优于分别以线粒体和核基因组DNA为靶标的马驴通用鉴定引物, 检出最低限度均满足检测需求。结论 通过比较马源性成分鉴定的3组PCR引物, 以线粒体DNA为靶标的Ⅱ组马源性成分特异性鉴定引物可作为马成分鉴定的首选, 线粒体和核基因组靶标联合可提高马成分鉴定的准确性并可用于杂交种鉴定, 为马源性成分及产制品鉴定提供了一定基础。 相似文献