全文获取类型
收费全文 | 159篇 |
免费 | 6篇 |
国内免费 | 1篇 |
专业分类
电工技术 | 1篇 |
化学工业 | 28篇 |
金属工艺 | 7篇 |
机械仪表 | 12篇 |
建筑科学 | 9篇 |
能源动力 | 7篇 |
轻工业 | 1篇 |
无线电 | 16篇 |
一般工业技术 | 28篇 |
冶金工业 | 28篇 |
原子能技术 | 1篇 |
自动化技术 | 28篇 |
出版年
2024年 | 3篇 |
2023年 | 4篇 |
2022年 | 6篇 |
2021年 | 1篇 |
2020年 | 9篇 |
2019年 | 8篇 |
2018年 | 13篇 |
2017年 | 6篇 |
2016年 | 13篇 |
2015年 | 4篇 |
2014年 | 9篇 |
2013年 | 18篇 |
2012年 | 11篇 |
2011年 | 5篇 |
2010年 | 11篇 |
2009年 | 10篇 |
2008年 | 6篇 |
2007年 | 7篇 |
2006年 | 3篇 |
2005年 | 2篇 |
2004年 | 2篇 |
2003年 | 3篇 |
2002年 | 3篇 |
2000年 | 1篇 |
1999年 | 3篇 |
1998年 | 1篇 |
1995年 | 2篇 |
1993年 | 2篇 |
排序方式: 共有166条查询结果,搜索用时 265 毫秒
41.
Ponnusamy Senthil Kumar Anbalagan Saravanan Kodyingil Anish Kumar Ramesh Yashwanth Sridharan Visvesh 《IET nanobiotechnology / IET》2016,10(4):244
In the present study, a novel activated carbon was prepared from low‐cost eucalyptus seeds, which was utilised for the effectively removal of toxic zinc from the water/wastewater. The prepared adsorbent was studied by Fourier transform infrared spectroscopy and scanning electron microscopic characterisation studies. Adsorption process was experimentally performed for optimising the influencing factors such as adsorbent dosage, solution pH, contact time, initial zinc concentration, and temperature for the maximum removal of zinc from aqueous solution. Adsorption isotherm of zinc removal was ensued Freundlich model, and the kinetic model ensued pseudo‐second order model. Langmuir monolayer adsorption capacity of the adsorbent for zinc removal was evaluated as 80.37 mg/g. The results of the thermodynamic studies suggested that the adsorption process was exothermic, thermodynamically feasible and impulsive process. Finally, a batch adsorber was planned to remove zinc from known volume and known concentration of wastewater using best obeyed model such as Freundlich. The experimental details showed the newly prepared material can be effectively utilised as a cheap material for the adsorption of toxic metal ions from the contaminated water.Inspec keywords: wastewater treatment, activated carbon, zinc, toxicology, regression analysis, Fourier transform infrared spectra, scanning electron microscopy, adsorption, pH, reaction kinetics, monolayers, thermodynamics, contaminationOther keywords: Zn, toxic metal ion adsorption, contaminated water, batch adsorber, exothermic process, thermodynamic process, Langmuir monolayer adsorption capacity, pseudosecond‐order model, kinetic model, Freundlich model, adsorption isotherm, aqueous solution, temperature value, initial zinc concentration, contact time, pH value, adsorbent dosage, scanning electron microscopic characterisation, Fourier transform infrared spectroscopy, nonlinear regression analysis, eucalyptus seed activated carbon, wastewater, toxic zinc removal 相似文献
42.
43.
Chandak A Lauterbach C Taylor M Ren Z Manocha D 《IEEE transactions on visualization and computer graphics》2008,14(6):1707-1714
We present an interactive algorithm to compute sound propagation paths for transmission, specular reflection and edge diffraction in complex scenes. Our formulation uses an adaptive frustum representation that is automatically sub-divided to accurately compute intersections with the scene primitives. We describe a simple and fast algorithm to approximate the visible surface for each frustum and generate new frusta based on specular reflection and edge diffraction. Our approach is applicable to all triangulated models and we demonstrate its performance on architectural and outdoor models with tens or hundreds of thousands of triangles and moving objects. In practice, our algorithm can perform geometric sound propagation in complex scenes at 4-20 frames per second on a multi-core PC. 相似文献
44.
Ali Ebnenasir Sandeep S. Kulkarni Anish Arora 《International Journal on Software Tools for Technology Transfer (STTT)》2008,10(5):455-471
In this paper, we present a software framework for adding fault-tolerance to existing finite-state programs. The input to
our framework is a fault-intolerant program and a class of faults that perturbs the program. The output of our framework is
a fault-tolerant version of the input program. Our framework provides (1) the first automated tool for the synthesis of fault-tolerant
distributed programs, and (2) an extensible platform for researchers to develop a repository of heuristics that deal with the complexity
of adding fault-tolerance to distributed programs. We also present a set of heuristics for polynomial-time addition of fault-tolerance to distributed programs. We
have used this framework for automated synthesis of several fault-tolerant programs including a simplified version of an aircraft
altitude switch, token ring, Byzantine agreement, and agreement in the presence of Byzantine and fail-stop faults. These examples
illustrate that our framework can be used for synthesizing programs that tolerate different types of faults (process restarts,
Byzantine and fail-stop) and programs that are subject to multiple faults (Byzantine and fail-stop) simultaneously. We have
found our framework to be highly useful for pedagogical purposes, especially for teaching concepts of fault-tolerance, automatic
program transformation, and the effect of heuristics. 相似文献
45.
Representing uncertain data: models, properties, and algorithms 总被引:1,自引:0,他引:1
Anish Das Sarma Omar Benjelloun Alon Halevy Shubha Nabar Jennifer Widom 《The VLDB Journal The International Journal on Very Large Data Bases》2009,18(5):989-1019
In general terms, an uncertain relation encodes a set of possible certain relations. There are many ways to represent uncertainty,
ranging from alternative values for attributes to rich constraint languages. Among the possible models for uncertain data,
there is a tension between simple and intuitive models, which tend to be incomplete, and complete models, which tend to be nonintuitive and more complex than necessary for many applications. We present a space
of models for representing uncertain data based on a variety of uncertainty constructs and tuple-existence constraints. We
explore a number of properties and results for these models. We study completeness of the models, as well as closure under
relational operations, and we give results relating closure and completeness. We then examine whether different models guarantee
unique representations of uncertain data, and for those models that do not, we provide complexity results and algorithms for
testing equivalence of representations. The next problem we consider is that of minimizing the size of representation of models,
showing that minimizing the number of tuples also minimizes the size of constraints. We show that minimization is intractable
in general and study the more restricted problem of maintaining minimality incrementally when performing operations. Finally,
we present several results on the problem of approximating uncertain data in an insufficiently expressive model. 相似文献
46.
Antani L Chandak A Taylor M Manocha D 《IEEE transactions on visualization and computer graphics》2012,18(2):261-269
We present an efficient algorithm for simulating diffuse reflections of sound in a static scene. Our approach is built on recent advances in precomputed light transport techniques for visual rendering and uses them to develop an improved acoustic radiance transfer technique. We precompute a direct-to-indirect acoustic transfer operator for a scene, and use it to map direct sound incident on the surfaces of the scene to multibounce diffuse indirect sound, which is gathered at the listener to compute the final impulse response. Our algorithm decouples the transfer operator from the source position so we can efficiently update the acoustic response at the listener when the source moves. We highlight its performance on various benchmarks and observe significant speedups over prior methods based on acoustic radiance transfer. 相似文献
47.
Individual fullerene molecules were observed and sized using high resolution transmission electron microscopy. Fullerene C60 molecules were tethered by chemical bonding to carbon black particles to facilitate HRTEM imaging and sizing of known fullerenes. HRTEM analysis of soot samples from a fullerene-forming flame revealed the presence of a range of fullerenes from C36 to C176 and larger fullerene-like structures. The observation of fullerenes smaller than C60 is noteworthy in that such structures necessarily contain adjacent pentagons and hence are strained and expected to have interesting reactivity that may be useful in certain applications. HRTEM can be used to detect and size fullerenes in samples containing fullerenes but not in sufficient quantity, or not sufficiently removable, to be detectable by chemical analysis. 相似文献
48.
The objective of our study is to design an expert system by modelling the knowledge and thinking process of a doctor. A fuzzy logic controller (FLC) is used to model the process and a genetic algorithm (GA) helps to select a number of good rules from a manually constructed large rule base of an FLC, based on the opinion of 10 doctors. The GA-based tuning is done off-line. Once the optimized rule base of the FLC is obtained, it can diagnose the disease, on-line. The scope of the present work has been extended to two diseases, namely Pneumonia and Jaundice. The symptoms of each disease are fed as inputs to the FLC and the output, i.e., grade of a disease is determined. 相似文献
49.
Luis E.Villegas-Hernández Vishesh Dubey Mona Nystad Jean-Claude Tinguely David A.Coucheron Firehun T.Dullo Anish Priyadarshi Sebastian Acu?a Azeem Ahmad José M.Mateos Gery Barmettler Urs Ziegler ?sa Birna Birgisdottir Aud-Malin Karlsson Hovd Kristin Andreassen Fenton Ganesh Acharya Krishna Agarwal Balpreet Singh Ahluwalia 《光:科学与应用(英文版)》2022,(3):324-340
Histology involves the observation of structural features in tissues using a microscope. While diffraction-limited optical microscopes are commonly used in hist... 相似文献
50.
Saranya Venugopal Emmanuel E. Boakye Anish Paul Kristin Keller Pavel Mogilevsky Bala Vaidhyanathan Jon G. P. Binner Allan Katz Peter M. Brown 《Journal of the American Ceramic Society》2014,97(1):92-99
Hafnium diboride (HfB2) powder has been synthesized via a sol–gel‐based route using phenolic resin, hafnium chloride, and boric acid as the source of carbon, hafnium, and boron, respectively, though a small number of comparative experiments involved amorphous boron as boron source. The effects of heat‐treatment dwell time and hafnium:carbon (Hf:C) and hafnium:boron (Hf:B) molar ratio on the purity and morphology of the final powder have been studied and the mechanism of HfB2 formation investigated using several techniques. The results showed that while temperatures as low as 1300°C could be used to produce HfB2 particles, the heat treatment needed to last for about 25 h. This in turn resulted in anisotropic particle growth along the c‐axis of the HfB2 crystals yielding tube‐like structures of about 10 μm long. Equiaxed particles 1–2 μm in size were obtained when the precursor was heat treated at 1600°C for 2 h. The reaction mechanism involved boro/carbothermal reduction and the indications were that the formation of HfB2 at 1300°C is through the intermediate formation of an amorphous B or boron suboxides, although at higher temperatures more than one reaction mechanism may be active. 相似文献