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21.
Refrigerated or Superchilled Skin‐Packed Sea Bream (Sparus aurata) Compared with Traditional Unpacked Storage on Ice with Regard to Physicochemical,Microbial and Sensory Attributes 下载免费PDF全文
22.
23.
M. J. González-Tejera J. M. Pereña A. Bello I. Hernandez-Fuentes 《Polymer Bulletin》1993,31(1):111-115
Summary Partial specific volume (v
2
o
) of polybibenzoates with all-methylene and oxyethylene spacers have been determined in chloroalifatic solvents. The polybibenzoate with a heptamethylene spacer exhibits a more expanded state than the ones with one, two and three oxyethylene units in the spacer. A solvent effect on v
2
o
has been observed. Nevertheless, the values of v
2
o
in tetrachloroethane are in accord with the calculated by group contributions from rubbery polymers. 相似文献
24.
We demonstrate the effectiveness of using a high Ar+H2 dilution of GeH4, high pressure, and low substrate temperatures in producing device-grade a-Ge:H through standard radio-frequency glow discharge deposition. The enhanced plasma chemistry encourages the production, heating, and incorporation of nanoparticles to increase order, while the low substrate temperature encourages hydrogen incorporation to saturate dangling bonds. We utilize the material in nip photodiodes illuminated through the n-side, and demonstrate a device with an i-layer thickness of only 60 nm showing JSC=20.6 mA/cm2 (AM1.5 Efficiency=2.1%). Temperature-dependent conductivity and bias-dependent spectral response measurements suggest that a non-uniform field distribution and a defect-rich region near the i–p interface are currently the limiting factors for the device performance. 相似文献
25.
Multiresolution for Algebraic Curves and Surfaces using Wavelets 总被引:1,自引:0,他引:1
This paper describes a multiresolution method for implicit curves and surfaces. The method is based on wavelets, and is able to simplify the topology. The implicit curves and surfaces are defined as the zero-valued piece-wise algebraic isosurface of a tensor-product uniform cubic B-spline. A wavelet multiresolution method that deals with uniform cubic B-splines on bounded domains is proposed. In order to handle arbitrary domains the proposed algorithm dynamically adds appropriate control points and deletes them in the synthesis phase. 相似文献
26.
Isaac Lera Pere P. Sancho Carlos Juiz Ramon Puigjaner Joachim Zottl Günter Haring 《Software Quality Journal》2007,15(1):53-67
In the computer science community there is a growing interest in the field of Ambient Intelligent Systems. This systems surround
their human users with computing and networking technology unobtrusively embedded in their environment. This technology is
aimed to provide the users with useful information and to take action to make the environment more convenient for them. As
the number of users increases the resources that make Ambient Intelligence possible can be easily saturated making the system
unstable and projecting an image of poor QoS to the users. The main goal of this paper is to provide the means for the Ambient
Intelligent Systems to monitor themselves and take corrective action automatically if performance starts to drop. Our approach
uses a Performance Ontology that structures the knowledge about Software Performance Engineering, and a reasoning engine that acts like an expert system
with the Performance Ontology as its foundation. The case study at the end shows the applicability of the developed techniques. 相似文献
27.
Isarain-Chávez E Rodríguez RM Cabot PL Centellas F Arias C Garrido JA Brillas E 《Water research》2011,45(14):4119-4130
The degradation of the beta-blockers atenolol, metoprolol tartrate and propranolol hydrochloride was studied by electro-Fenton (EF) and solar photoelectro-Fenton (SPEF). Solutions of 10 L of 100 mg L−1 of total organic carbon of each drug in 0.1 M Na2SO4 with 0.5 mM Fe2+ of pH 3.0 were treated in a recirculation flow plant with an electrochemical reactor coupled with a solar compound parabolic collector. Single Pt/carbon felt (CF) and boron-doped diamond (BDD)/air-diffusion electrode (ADE) cells and combined Pt/ADE-Pt/CF and BDD/ADE-Pt/CF cells were used. SPEF treatments were more potent with the latter cell, yielding 95-97% mineralization with 100% of maximum current efficiency and energy consumptions of about 0.250 kWh g TOC−1. However, the Pt/ADE-Pt/CF cell gave much lower energy consumptions of about 0.080 kWh g TOC−1 with slightly lower mineralization of 88-93%, then being more useful for its possible application at industrial level. The EF method led to a poorer mineralization and was more potent using the combined cells by the additional production of hydroxyl radicals (•OH) from Fenton’s reaction from the fast Fe2+ regeneration at the CF cathode. Organics were also more rapidly destroyed at BDD than at Pt anode. The decay kinetics of beta-blockers always followed a pseudo first-order reaction, although in SPEF, it was accelerated by the additional production of •OH from the action of UV light of solar irradiation. Aromatic intermediates were also destroyed by hydroxyl radicals. Ultimate carboxylic acids like oxalic and oxamic remained in the treated solutions by EF, but their Fe(III) complexes were photolyzed by solar irradiation in SPEF, thus explaining its higher oxidation power. NO3− was the predominant inorganic ion lost in EF, whereas the SPEF process favored the production of NH4+ ion and volatile N-derivatives. 相似文献
28.
The assessment of the dynamic or seismic performance of complex structures often requires the integration in the time domain of the structural equation of motion in the frame of a nonlinear analysis. Although sophisticated methods have been developed for the nonlinear analysis of masonry wall structures, including the macro- and micro-modeling approaches, these require large computational effort still limiting the extent and complexity of the structures analyzed. This paper presents an alternative method based on the Generalized Matrix Formulation for masonry skeletal structures and load bearing wall systems, which has been proved as an efficient formulation for the analysis of the strength capacity of these kinds of structures (Roca et al. (2005) [17]). The basic formulation has been complemented with a uniaxial cyclic constitutive model for masonry and a time integration scheme. The ability of the resulting approach to predict the nonlinear dynamic response of masonry structures is shown through its application to the time domain analysis of an experimental scale masonry building with available experimental results on its dynamic response. 相似文献
29.
Rosario Benavente José M. Pereña Antonio Bello Ernesto Pérez Paolo Locatelli Zhi-Quiang Fan Debora Zucchi 《Polymer Bulletin》1996,36(2):249-256
Summary The thermal and viscoelastic behaviour of several copolymers of propene and 1-hexene have been studied in a wide range of compositions. The samples were prepared with a Ziegler-Natta catalyst with both internal and external donors. A significant amount of crystallinity has been found for the sample with a comonomer content as high as 19 mol %. The dynamic mechanical results show a considerable decrease of the storage modulus in the copolymers in relation to that of iPP. A single relaxation, corresponding to the glass transition, has been found in all the samples. Only the copolymer with the highest hexene content seems to display the beginning of another relaxation at low temperature. 相似文献
30.
H Pere J Tapper M Sepp?l? S Knuutila R Butzow 《Canadian Metallurgical Quarterly》1998,58(19):4274-4276
Serous carcinomas of the fallopian tube, uterus, and ovary resemble each other both histologically and in clinical behavior. Comparative genomic hybridization was performed on 20 primary fallopian tube carcinoma specimens to find regions of the genome involved in tubal carcinogenesis and to compare the genomic alterations with those previously detected in serous ovarian and uterine carcinomas. The most frequent changes detected in fallopian tube carcinoma were gains at 3q (70%) and 8q (75%), with high-level amplifications in several cases. Other common gains occurred at 1q, 5p, 7q, 12p, and 20q. The most frequent losses were found at 18q, 8p, 4q, and 5q. The frequency and the pattern of chromosomal changes detected in tubal carcinoma were strikingly similar to those observed in serous ovarian and uterine carcinomas, suggesting common molecular pathogenesis. 相似文献