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51.
Rahikainen Jarkko González Francisco Naya Miguel Ángel Sopanen Jussi Mikkola Aki 《Multibody System Dynamics》2020,50(2):143-167
Multibody System Dynamics - The simulation of mechanical devices using multibody system dynamics (MBS) algorithms frequently requires the consideration of their interaction with components of a... 相似文献
52.
Jussi Korpela Andreas Henelius Lauri Ahonen Arto Klami Kai Puolamäki 《Data mining and knowledge discovery》2016,30(5):1112-1133
In many data analysis tasks it is important to understand the relationships between different datasets. Several methods exist for this task but many of them are limited to two datasets and linear relationships. In this paper, we propose a new efficient algorithm, termed cocoreg, for the extraction of variation common to all datasets in a given collection of arbitrary size. cocoreg extends redundancy analysis to more than two datasets, utilizing chains of regression functions to extract the shared variation in the original data space. The algorithm can be used with any linear or non-linear regression function, which makes it robust, straightforward, fast, and easy to implement and use. We empirically demonstrate the efficacy of shared variation extraction using the cocoreg algorithm on five artificial and three real datasets. 相似文献
53.
Seng‐Kyoun Jo Young‐Min Kim Hyun‐Woo Lee Jussi Kangasharju Max Mülhäuser 《ETRI Journal》2017,39(2):275-283
A green technology for reducing energy consumption has become a critical factor in ICT industries. However, for the telecommunications sector in particular, most network elements are not usually optimized for power efficiency. Here, we propose a novel energy‐efficient packet switching method for use in an IP network for reducing unnecessary energy consumption. As a green networking approach, we first classify the network nodes into either header or member nodes. The member nodes then put the routing‐related module at layer 3 to sleep under the assumption that the layer in the OSI model can operate independently. The entire set of network nodes is then partitioned into clusters consisting of one header node and multiple member nodes. Then, only the header node in a cluster conducts IP routing and its member nodes conduct packet switching using a specially designed identifier, a tag. To investigate the impact of the proposed scheme, we conducted a number of simulations using well‐known real network topologies and achieved a more energy‐ efficient performance than that achieved in previous studies. 相似文献
54.
Wastewater treatment: New insight provided by interactive multiobjective optimization 总被引:2,自引:0,他引:2
Jussi HakanenAuthor Vitae 《Decision Support Systems》2011,51(2):328-337
In this paper, we describe a new interactive tool developed for wastewater treatment plant design. The tool is aimed at supporting the designer in designing new wastewater treatment plants as well as optimizing the performance of already available plants. The idea is to utilize interactive multiobjective optimization which enables the designer to consider the design with respect to several conflicting evaluation criteria simultaneously. This is more important than ever because the requirements for wastewater treatment plants are getting tighter and tighter from both environmental and economical reasons. By combining a process simulator to simulate wastewater treatment and an interactive multiobjective optimization software to aid the designer during the design process, we obtain a practically useful tool for decision support. The applicability of our tool is illustrated with a case study related to municipal wastewater treatment where three conflicting evaluation criteria are considered. 相似文献
55.
Seasonal changes are particularly strong in northern Europe. Daylight, temperature, flora, fauna and landscape change from day to day. We discuss how seasonality exists in nature, is felt by people and is reflected in urban planning. The case study regards Oulunsalo municipality with a population of 9,000 at the northern most Baltic Sea coast in Finland. In 2003 the mean temperature of the coldest month in Oulunsalo was ?16.4 and the warmest +19.5 centigrade. The longest day was 22 hours 3 minutes and the shortest 3 hours and 35 minutes. A survey among the adult Oulunsalo population shows that summer is the best season for the majority of people (72%)—more often for men (78%) than for women (66%). Almost everybody (96%) likes the change of seasons. Seasons and seasonal preferences should be considered more in urban planning processes and land-use plans. 相似文献
56.
Brijesh Kumar Giri Jussi Hakanen Kaisa Miettinen Nirupam Chakraborti 《Applied Soft Computing》2013,13(5):2613-2623
A new bi-objective genetic programming (BioGP) technique has been developed for meta-modeling and applied in a chromatographic separation process using a simulated moving bed (SMB) process. The BioGP technique initially minimizes training error through a single objective optimization procedure and then a trade-off between complexity and accuracy is worked out through a genetic algorithm based bi-objective optimization strategy. A benefit of the BioGP approach is that an expert user or a decision maker (DM) can flexibly select the mathematical operations involved to construct a meta-model of desired complexity or accuracy. It is also designed to combat bloat – a perennial problem in genetic programming along with over fitting and under fitting problems. In this study the meta-models constructed for SMB reactors were compared with those obtained from an evolutionary neural network (EvoNN) developed earlier and also with a polynomial regression model. Both BioGP and EvoNN were compared for subsequent constrained bi-objective optimization studies for the SMB reactor involving four objectives. The results were also compared with the previous work in the literature. The BioGP technique produced acceptable results and is now ready for data-driven modeling and optimization studies at large. 相似文献
57.
Jussi Rahom?ki Heikki J Hyv?rinen Shakil Rehman Jari Turunen 《Nanoscale research letters》2013,8(1):326
We propose a scheme based on extraordinary transmission of light through a single nanoaperture, surrounded by periodic corrugations, for direct characterization of focal-region optical fields with subwavelength-scale structure. We describe the design of the device on the basis of rigorous diffraction theory and fabricate a prototype using a process that involves electron beam lithography, dry etching, and template stripping. First experimental results performed with a transmission-type confocal optical microscope demonstrate the potential of the method. 相似文献
58.
Mohammad?TabatabaeiEmail author Jussi?Hakanen Markus?Hartikainen Kaisa?Miettinen Karthik?Sindhya 《Structural and Multidisciplinary Optimization》2015,51(1):1-21
Computationally expensive multiobjective optimization problems arise, e.g. in many engineering applications, where several conflicting objectives are to be optimized simultaneously while satisfying constraints. In many cases, the lack of explicit mathematical formulas of the objectives and constraints may necessitate conducting computationally expensive and time-consuming experiments and/or simulations. As another challenge, these problems may have either convex or nonconvex or even disconnected Pareto frontier consisting of Pareto optimal solutions. Because of the existence of many such solutions, typically, a decision maker is required to select the most preferred one. In order to deal with the high computational cost, surrogate-based methods are commonly used in the literature. This paper surveys surrogate-based methods proposed in the literature, where the methods are independent of the underlying optimization algorithm and mitigate the computational burden to capture different types of Pareto frontiers. The methods considered are classified, discussed and then compared. These methods are divided into two frameworks: the sequential and the adaptive frameworks. Based on the comparison, we recommend the adaptive framework to tackle the aforementioned challenges. 相似文献
59.
Jussi Loponen Pia Laine Tuula Sontag-Strohm Hannu Salovaara 《European Food Research and Technology》2007,225(1):105-110
Oat bran fermentation (OBF) is used to produce non-dairy yogurt-type products. Such products may be designed being rich in
probiotic bacteria and/or dietary-fibre. Oat bran is, however, also rich in proteins, especially 12 S globulins. Understanding
the behaviour of globulins in OBF would thus offer a basis for further exploitation of proteins in the product design. The
behaviour of oat globulins was monitored during a model OBF in order to study changes in protein solubility and possible protein
hydrolysis. Proteins were extracted from OBF samples with a buffered and a non-buffered extraction procedure. The extracts
were analyzed with SDS-PAGE and a Lowry assay. Combined effect of pH and NaCl-concentration on the solubility of oat globulin
isolate was studied. The solubility of oat globulins decreased during OBF; this appeared as their shift from the salt-soluble
fraction to the residual protein fraction. The shift in oat globulin solubility was due to the acidifying conditions present
in OBF, which lead to the unfolding of globulins and also apparently induced protein aggregation. No major protein hydrolysis
was observed during OBF. 相似文献
60.
Friction coefficients for cubic boron nitride were determined with the use of hybrid density functional B3LYP calculations.
Two cluster models and an infinite periodic model were applied. Various contacts between duplicated surfaces and different
sliding paths of the surfaces with respect to each other were taken into consideration, and friction coefficients were derived.
The calculations suggest that three different sliding paths contribute to the friction, the friction coefficient for the periodic
model being 0.21 at its lowest. This value is in agreement with previous experimental studies, where a friction coefficient
of 0.1–0.2 has been measured for cubic boron nitride. 相似文献