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排序方式: 共有146条查询结果,搜索用时 234 毫秒
1.
In this paper we present a Multi-Element generalized Polynomial Chaos (ME-gPC) method to deal with stochastic inputs with arbitrary probability measures. Based on the decomposition of the random space of the stochastic inputs, we construct numerically a set of orthogonal polynomials with respect to a conditional probability density function (PDF) in each element and subsequently implement generalized Polynomial Chaos (gPC) locally. Numerical examples show that ME-gPC exhibits both p- and h-convergence for arbitrary probability measures 相似文献
2.
Oxidative Stability and Changes in Chemical Composition of Extra Virgin Olive Oils After Short‐Term Deep‐Frying of French Fries 下载免费PDF全文
Emília Akil Vanessa Naciuk Castelo‐Branco André Mesquita Magalhães Costa Ana Lúcia do Amaral Vendramini Verônica Calado Alexandre Guedes Torres 《Journal of the American Oil Chemists' Society》2015,92(3):409-421
We aimed at investigating oxidative stability and changes in fatty acid and tocopherol composition of extra virgin olive oil (EVOO) in comparison with refined seed oils during short‐term deep‐frying of French fries, and changes in the composition of the French fries deep‐fried in EVOO. EVOO samples from Spain, Brazil, and Portugal, and refined seed oils of soybean and sunflower were studied. Oil samples were used for deep‐frying of French fries at 180 °C, for up to 75 min of successive frying. Tocopherol and fatty acid composition were determined in fresh and spent vegetable oils. Tocopherol, fatty acid, and volatile composition (by SPME–GC–MS) were also determined in French fries deep‐fried in EVOO. Oil oxidation was monitored by peroxide, acid, and p‐anisidine values, and by Rancimat after deep‐frying. Differential scanning calorimetry (DSC) analysis was used as a proxy of the quality of the spent oils. EVOOs presented the lowest degree of oleic and linoleic acids losses, low formation of free fatty acids and carbonyl compounds, and were highly stable after deep‐frying. In addition, oleic acid, tocopherols, and flavor compounds were transferred from EVOO into the French fries. In conclusion, EVOOs were more stable than refined seed oils during short‐term deep‐frying of French fries and also contributed to enhance the nutritional value, and possibly improve the flavor, of the fries prepared in EVOO. 相似文献
3.
Dionysios S. Karousos Andreas A. Sapalidis Evangelos P. Kouvelos George Em. Romanos Nickolaos K. Kanellopoulos 《分离科学与技术》2016,51(1):83-95
Based on its low cost and low water adsorption capacity, compared to synthetic zeolites (A-type, X-type and Y-type), natural, untreated clinoptilolite was examined as a potential adsorbent for a separation process targeting on removal of CO2 from flue gas. Taking into consideration typical flue gas composition and temperature, adsorptive properties of binary CO2/N2 mixtures were tested in the temperature range of 268 to 403 K and compared with literature data. The results showed that CO2 concentration, total pressure, and temperature strongly affect selectivity and working capacity, restricting the conditions under which the material could be used as an efficient adsorbent. 相似文献
4.
Gabriel Henrique Horta de Oliveira Paulo Cesar Corrêa Emílio de Souza Santos Pedro Casanova Treto Mayra Darliane Martins Silva Diniz 《International Journal of Food Science & Technology》2011,46(10):2077-2084
The desorption isotherms and thermodynamic properties of cocoa beans were obtained during the drying process of this product. The isotherms were determined by dynamic method for various temperature (25, 35, 45 and 55 °C) and relative humidity (RH) conditions (30, 40, 50, 60, 70 and 80%). Equilibrium moisture content data were correlated by the Guggenheim–Anderson–de Boer (GAB) model, which presented good fit to the data, according to statistical procedures. Equilibrium moisture content ranged from 5.90 to 16.67 d.b.; it increased with an increment in the RH and decreased with increased temperature at a constant RH. Enthalpy values for each model coefficient were encountered, ranging from ?90.05 to 545.96 kJ kg?1. The integral isosteric heat of desorption and differential entropy increased with decreased equilibrium moisture content, a tendency also found for Gibbs free energy. 相似文献
5.
Distributed Streams Algorithms for Sliding Windows 总被引:1,自引:0,他引:1
Phillip B.?GibbonsEmail author Srikanta?TirthapuraEmail author 《Theory of Computing Systems》2004,37(3):457-478
Massive data sets often arise as physically distributed, parallel data
streams, and it is important to estimate various aggregates and statistics on the
union of these streams. This paper presents algorithms for estimating aggregate
functions over a “sliding window” of the N most recent data items in one or more
streams. Our results include:
1. For a single stream,we present the first ε-approximation scheme for the number
of 1’s in a sliding window that is optimal in both worst case time and space.
We also present the first ε-approximation scheme for the sum of integers in
[0..R] in a sliding window that is optimal in both worst case time and space
(assuming R is at most polynomial in N). Both algorithms are deterministic
and use only logarithmic memory words.
2. In contrast, we show that any deterministic algorithm that estimates, to within
a small constant relative error, the number of 1’s (or the sum of integers) in a
sliding window on the union of distributed streams requires Ω(N) space.
3. We present the first (randomized) (ε, δ)-approximation scheme for the number
of 1’s in a sliding window on the union of distributed streams that uses only
logarithmic memory words. We also present the first (ε, δ)-approximation
scheme for the number of distinct values in a sliding window on distributed
streams that uses only logarithmic memory words.
Our results are obtained using a novel family of synopsis data structures called
waves. 相似文献
6.
In this article we provide a theoretically informed empirical analysis of the introduction and use of information and communication technology (ICT) within the primary health care (PHC) sector of Mozambique. The theoretical lens for this analysis is developed from Manuel Castells' (1996, 1997, 2001) ideas on the network society and counter domination. These ideas help us to conceptualize the communicative action required to strengthen the PHC sector as a “counter network,” which has the normative aim to strengthen the health information system (HIS) as a key strategy to improve health care delivery. Taking an informational perspective, the role of communication is highlighted as playing an important constitutive basis in the strengthening of this network. These conceptual ideas are applied to the empirical analysis of an ongoing project (the Health Information Systems Programme or HISP), and to analyze some key constraints and strategies for strengthening these networks. This study makes key contributions to both the theoretical and practical domains of HIS in developing countries. © 2005 Wiley Periodicals, Inc. 相似文献
7.
Elisângela Vilar Francisco Rebelo Paulo Noriega Emília Duarte Christopher B. Mayhorn 《Ergonomics》2014,57(4):511-524
This study examined the relative influence of environmental variables (corridor width and brightness) and signage (directional and exit signs), when presented in competition, on participants' route-choices in two situational variables (everyday vs. emergency), during indoor wayfinding in virtual environments. A virtual reality-based methodology was used. Thus, participants attempted to find a room (everyday situation) in a virtual hotel, followed by a fire-related emergency egress (emergency situation). Different behaviours were observed. In the everyday situation, for no-signs condition, participants choose mostly the wider and brighter corridors, suggesting a heavy reliance on the environmental affordances. Conversely, for signs condition, participants mostly complied with signage, suggesting a greater reliance on the signs rather than on the environmental cues. During emergency, without signage, reliance on environmental affordances seems to be affected by the intersection type. In the sign condition, the reliance on environmental affordances that started strong decreases along the egress route. 相似文献
8.
Tsalafoutas IA Chrysovergis DA Maniatis PN Vassilaki AE Triantopoulou ChC Yakoumakis EN Koulentianos ED 《Radiation protection dosimetry》2005,113(2):162-167
The purpose of this study was to determine the patient doses during enteroclysis and compare them with the available bibliographical data. For 14 enteroclysis examinations, the dose-area product (DAP) meter readings, fluoroscopy time, number of radiographs and exposure data were recorded. From these data, the fluoroscopy and radiography contributions to DAP, the entrance surface dose (ESD) and the effective dose (E) for each examination were estimated. The mean DAP was 81 Gy cm(2) and the mean fluoroscopy time was 19.5 min. The fluoroscopy contribution to DAP was 77% and 8.7 films were acquired in each examination on average. The mean ESD and E were estimated to be 428 mGy and 21 mSv, respectively. The mean DAP and fluoroscopy time calculated in this study are quite high when compared with those reported in the literature, suggesting that the examination technique should be reviewed and the ways to reduce patient exposure without compromising the diagnostic quality should be acquired. 相似文献
9.
10.
Frontiers of Mechanical Engineering - In recent years, the new technologies and discoveries on manufacturing materials have encouraged researchers to investigate the appearance of material... 相似文献