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1.
Unconrolled agglomeration of particles and adhesion of the particulate mass to wall surfaces are common severe problems in many drying operations. This paper reviews the mechanisms of interparticle and particle-surface attraction as well as the theory and the existing tests for characterising powders in terms of internal strength, wall friction and adhesion. The usefulness of the information obtained from these tests in dryer design and operation is critically reviewed. The importance of powder stickiness in various types of dryers is discussed and established methods of combating the problem are presented Recommendations an made for further research in the area of powder cohesion and adhesion. 相似文献
2.
Anwar Syed Muhammad Irmakci Ismail Torigian Drew A. Jambawalikar Sachin Papadakis Georgios Z. Akgun Can Ellermann Jutta Akcakaya Mehmet Bagci Ulas 《Journal of Signal Processing Systems》2022,94(5):497-510
Journal of Signal Processing Systems - Segmentation of thigh tissues (muscle, fat, inter-muscular adipose tissue (IMAT), bone, and bone marrow) from magnetic resonance imaging (MRI) scans is useful... 相似文献
3.
Automating software testing activities can increase the quality and drastically decrease the cost of software development.
Toward this direction, various automated test data generation tools have been developed. The majority of existing tools aim
at structural testing, while a quite limited number aim at a higher level of testing thoroughness such as mutation. In this
paper, an attempt toward automating the generation of mutation-based test cases by utilizing existing automated tools is proposed.
This is achieved by reducing the killing mutants’ problem into a covering branches one. To this extent, this paper is motivated
by the use of state of the art techniques and tools suitable for covering program branches when performing mutation. Tools
and techniques such as symbolic execution, concolic execution, and evolutionary testing can be easily adopted toward automating
the test input generation activity for the weak mutation testing criterion by simply utilizing a special form of the mutant
schemata technique. The propositions made in this paper integrate three automated tools in order to illustrate and examine
the method’s feasibility and effectiveness. The obtained results, based on a set of Java program units, indicate the applicability
and effectiveness of the suggested technique. The results advocate that the proposed approach is able to guide existing automating
tools in producing test cases according to the weak mutation testing criterion. Additionally, experimental results with the
proposed mutation testing regime show that weak mutation is able to speedup the mutant execution time by at least 4.79 times
when compared with strong mutation. 相似文献
4.
Papadakis N Bugeau A 《IEEE transactions on pattern analysis and machine intelligence》2011,33(1):144-157
This work presents a new method for tracking and segmenting along time-interacting objects within an image sequence. One major contribution of the paper is the formalization of the notion of visible and occluded parts. For each object, we aim at tracking these two parts. Assuming that the velocity of each object is driven by a dynamical law, predictions can be used to guide the successive estimations. Separating these predicted areas into good and bad parts with respect to the final segmentation and representing the objects with their visible and occluded parts permit handling partial and complete occlusions. To achieve this tracking, a label is assigned to each object and an energy function representing the multilabel problem is minimized via a graph cuts optimization. This energy contains terms based on image intensities which enable segmenting and regularizing the visible parts of the objects. It also includes terms dedicated to the management of the occluded and disappearing areas, which are defined on the areas of prediction of the objects. The results on several challenging sequences prove the strength of the proposed approach. 相似文献
5.
6.
Nikos Papadakis Dimitris Plexousakis Myron Papadakis Harris Manifavas 《Journal of Intelligent Information Systems》2012,38(1):41-94
In this paper we study the ramification problem in the setting of temporal databases. Standard solutions from the literature
on reasoning about action are inadequate because they rely on the assumption that fluents persist, and because actions have
effects on the next situation only. In this paper we provide a solution to the ramification problem based on an extension
of the situation calculus and the work of McCain and Turner. More specifically, we study the case where there are conflicting
effects of an action, a particularly complex problem. Also we present a tool which implements the proposed solution. 相似文献
7.
8.
The residence times of the components of two- and three-component mixtures of fine (195 µm), coarse (1315 µm) and very coarse (5040 µm) sands were measured in a pilot-scale cascading rotary dryer. The effects of mixture composition and air velocity (0-5.4 m s-1) were determined. With no air flowing through the drum, the residence times of the individual components were almost the same as that of the overall mixture. Increasing the gas velocity caused a large decrease in residence time. In contrast, particle size had very little effect. The spread of residence times increased with air velocity, peaking between 2 and 4 m s-1; composition had very little effect on the spread. The residence time of the overall mixture could be calculated using the particle transport model of Matchett and Baker if both the modified drag coefficient Φd and the particle Reynolds number Rep were based on the superficial air velocity and the mass-average particle diameter. 相似文献
9.
Emmanuel P. Papadakis 《Metallurgical and Materials Transactions B》1971,2(2):575-578
The zeroth order plate mode shear wave velocity has been measured in thin strip specimens of Oriented Electrical Steel, Elinvar-Extra,
and RMI 464 titanium alloy as a function of the angle between the propagation direction and the rolling direction. Also, the
plane wave shear and longitudinal velocities have been measured along the normal to the rolling plane. The results in the
Oriented Electrical Steel agree with the known (110)[001] texture. In the Elinvar-Extra there is a texture indistinguishable
elastically from (100)[Oil], or partial (100)[011] superimposed on a random background. Different annealing temperatures following
cold-rolling yield different degrees of anisotropy and different dependences (1/G)(dG/dT) of the shear modulus upon ambient temperature. At an annealing temperature of about 850‡C, (1/G)(dG/dT) evaluated near room temperature changes from positive to negative, and anisotropy becomes minimum. In the RMI 464 titanium
alloy, the shear velocity anisotropy was only 1 pct in the rolling plane.
Formerly with Bell Telephone Laboratories, Allen town, Pa. 相似文献
10.
Assessment of requirements on safety management systems in EU regulations for the control of major hazard pipelines 总被引:1,自引:0,他引:1
Papadakis GA 《Journal of hazardous materials》2000,78(1-3):63-89
The European Commission has carried out a thorough review and assessment on whether pipelines conveying dangerous substances need a level of control similar to chemical installations, based on consideration of the hazards and risks and on accidents world-wide. The study examines whether sufficient controls already exist within the European Union (EU) Member States, considering the control philosophy of the 'Seveso II' Directive and the need to support development of pipeline networks across the EU taking into account the principles of sustainability. Community legislation would be supported by a set of criteria for the classification of Major-Accident Hazard Pipelines. Such criteria are examined for the onshore transmission pipelines in the EU. The Commission study has shown that there is a large variation in the degree to which Member States have comprehensive 'major-accident hazard' legislation on pipelines, and that existing legislation rarely addresses elements of the Safety Management System. The assessment, based on a proposed Pipeline Safety Instrument, indicates that there will be added value in a European Instrument drawing on the principles of Seveso II Directive concerning Safety Management System requirements. 相似文献