全文获取类型
收费全文 | 80篇 |
免费 | 8篇 |
专业分类
电工技术 | 2篇 |
化学工业 | 22篇 |
机械仪表 | 1篇 |
建筑科学 | 1篇 |
能源动力 | 2篇 |
轻工业 | 25篇 |
石油天然气 | 1篇 |
无线电 | 3篇 |
一般工业技术 | 4篇 |
冶金工业 | 7篇 |
自动化技术 | 20篇 |
出版年
2022年 | 2篇 |
2021年 | 6篇 |
2020年 | 4篇 |
2019年 | 2篇 |
2018年 | 5篇 |
2017年 | 6篇 |
2016年 | 2篇 |
2015年 | 3篇 |
2014年 | 2篇 |
2013年 | 1篇 |
2012年 | 2篇 |
2011年 | 3篇 |
2010年 | 6篇 |
2009年 | 4篇 |
2008年 | 5篇 |
2007年 | 4篇 |
2006年 | 7篇 |
2005年 | 2篇 |
2004年 | 3篇 |
2003年 | 1篇 |
2002年 | 3篇 |
2001年 | 1篇 |
2000年 | 2篇 |
1999年 | 2篇 |
1998年 | 1篇 |
1997年 | 1篇 |
1996年 | 1篇 |
1994年 | 1篇 |
1993年 | 3篇 |
1988年 | 1篇 |
1986年 | 1篇 |
1984年 | 1篇 |
排序方式: 共有88条查询结果,搜索用时 15 毫秒
81.
Delivering live multimedia streaming over ad hoc networks can improve coordination in battlefields, assist in disaster recovery operations, and help prevent vehicular traffic accidents. However, ad hoc networks often experience congestion faster than wired networks, leading to high end-to-end delays and jitter even for moderate traffic. This paper describes a partial remedy that applies to delay sensitive but loss tolerant applications such as live streaming. We find that under relatively high UDP traffic load, the Last-In–First-Out (LIFO) with Frontdrop queuing discipline achieves less than half the delay of the commonly used First-In–First-Out (FIFO) with Taildrop, while maintaining similar jitter. In low traffic situations, FIFO and LIFO have similar delays, but FIFO with Frontdrop has the lowest jitter. The results can be applied to an adaptive queuing mechanism that changes the queuing discipline at nodes function of the locally observed traffic load. The advantage of such an approach is that it does not require new protocols and does not incur any network overhead. 相似文献
82.
Higher Order Active Contours 总被引:1,自引:0,他引:1
Marie Rochery Ian H. Jermyn Josiane Zerubia 《International Journal of Computer Vision》2006,69(1):27-42
We introduce a new class of active contour models that hold great promise for region and shape modelling, and we apply a special
case of these models to the extraction of road networks from satellite and aerial imagery. The new models are arbitrary polynomial
functionals on the space of boundaries, and thus greatly generalize the linear functionals used in classical contour energies.
While classical energies are expressed as single integrals over the contour, the new energies incorporate multiple integrals,
and thus describe long-range interactions between different sets of contour points. As prior terms, they describe families
of contours that share complex geometric properties, without making reference to any particular shape, and they require no
pose estimation. As likelihood terms, they can describe multi-point interactions between the contour and the data. To optimize
the energies, we use a level set approach. The forces derived from the new energies are non-local however, thus necessitating
an extension of standard level set methods. Networks are a shape family of great importance in a number of applications, including
remote sensing imagery. To model them, we make a particular choice of prior quadratic energy that describes reticulated structures,
and augment it with a likelihood term that couples the data at pairs of contour points to their joint geometry. Promising
experimental results are shown on real images. 相似文献
83.
Predicting capacities required in cardiology units for heart failure patients via simulation 总被引:1,自引:0,他引:1
Groothuis S Hasman A van Pol PE Lencer NH Janssen JJ Jans JD Stappers JL Dassen WR Doevendans PA van Merode GG 《Computer methods and programs in biomedicine》2004,74(2):129-141
The management of a department of cardiology has to plan the capacity of both elective and non-elective patients. Heart failure (HF) patients are admitted to the hospital in a non-elective way. The precision with which the capacity needed for non-elective patients can be predicted determines the degree of flexibility in planning the admission of elective patients. In this study we want to determine how accurately we can predict the bed occupancy of HF patients using a simulation model. Data of the year 2000 were used to obtain the necessary probability distribution functions. Data from the year 2001 were used for determining the prediction accuracy. The results show that the arrival of new HF patients can be adequately predicted. However, the bed occupancy by new and especially current patients is predicted less accurately. Still in 70% (90%) of the days of a 5-day-prediction interval the error is at most one (two) bed(s). The results may improve if the cardiologist is asked to predict the length of stay of the current patients. 相似文献
84.
Three experiments investigated the ability of French newborns to discriminate between sets of sentences in different foreign languages. The sentences were low-pass filtered to reduce segmental information while sparing prosodic information. Infants discriminated between stress-timed English and mora-timed Japanese (Experiment 1) but failed to discriminate between stress-timed English and stress-timed Dutch (Experiment 2). In Experiment 3, infants heard different combinations of sentences from English, Dutch, Spanish, and Italian. Discrimination was observed only when English and Dutch sentences were contrasted with Spanish and Italian sentences. These results suggest that newborns use prosodic and, more specifically, rhythmic information to classify utterances into broad language classes defined according to global rhythmic properties. Implications of this for the acquisition of the rhythmic properties of the native language are discussed. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
85.
Sullivan Renouard Christophe Hano Cyrielle Corbin Ophélie Fliniaux Tatiana Lopez Josiane Montguillon Esmatullah Barakzoy François Mesnard Frédéric Lamblin Eric Lainé 《Food chemistry》2010
Extraction of secoisolariciresinol from seed hulls and whole seeds of flax was improved using an enzymatic step with cellulase R10 from Trichoderma reesei that allowed better yield as compared to β-glucosidase. The cellulase assisted extraction process was further optimised for different parameters such as duration and concentration of hydromethanolic extraction, duration of alkaline hydrolysis, pH, duration and incubation temperature as well as enzyme concentration. Best results were obtained using a method including the following successive steps: 16 h of 70% hydromethanolic extraction, 6 h of 0.1 M sodium hydroxide hydrolysis followed by a 6 h incubation with 1 unit ml−1 of cellulase R10 in 0.1 M citrate–phosphate buffer pH 2.8 at 40 °C. Under these conditions, all forms of the main flax lignan were recovered as the aglycone form, i.e. secoisolariciresinol. Highest yields in secoisolariciresinol diglucoside (SDG) equivalent reached 7.72% of flaxseed hull (cv. Baladin) dry weight and 2.88% of whole seed (cv. Barbara) weight, thus allowing a significant improvement in comparison with published methods. 相似文献
86.
Vincent Varlet Thierry Serot Camille Knockaert Josiane Cornet Mireille Cardinal Fabrice Monteau Bruno Le Bizec Carole Prost 《Journal of the science of food and agriculture》2007,87(5):847-854
Four industrial processes for smoking food were studied through their effects on the organoleptic properties of smoked salmon and on the occurrence of 20 polycyclic aromatic hydrocarbons (PAHs) known as being contaminants of smoking processes. The contamination by PAHs of the food might be measured by their corresponding toxic equivalent quantity (TEQ) expressed in µg kg?1. The results show a significant correlation between the smoking process parameters, the odour of the smoked fish and the presence of PAHs. Smouldering, thermostated plates and friction smoking processes allow smoked fish with very close odorant characteristics to be obtained. However, differences of pyrolysis temperature (between 380 and 500 °C) causes significant differences of PAHs concentration even if the contents are under the legal threshold concerning benzo(a)pyrene (5 µg kg?1). Smoked fish obtained by liquid smoke vaporisation presented the lowest level of PAHs but benzo(a)pyrene concentration is nevertheless important. The odours brought by the liquid smoke process are more ‘cold smoke’ and ‘vegetal/green’ than the other techniques, which are smokier and fishier. Copyright © 2007 Society of Chemical Industry 相似文献
87.