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排序方式: 共有117条查询结果,搜索用时 15 毫秒
91.
V.T. Giner S. Ivorra F.J. Baeza E. Zornoza B. Ferrer 《Construction and Building Materials》2011,25(8):3272-3277
The construction of concrete structures using silica fume (SF) additions is a common practice because it is well known that this pozzolanic material improves the compressive strength of concrete, among many other mechanical and physical properties. The response of a structure under dynamic actions is highly determined by the dynamic mechanical properties of its building material. In this work, it has been studied the influence of SF additions in quantities ranging from 0% to 15% of cement mass on the dynamic and static mechanical properties of concrete, such as: resonant frequencies, dynamic and static modulus of elasticity, damping ratio, compressive strength and flexural strength. The results prove that SF additions or replacements reduce both the dynamic modulus of elasticity and damping ratio of concrete. The dynamic elastic properties of concrete, with and without SF, present higher values than their static counterparts. These differences are smaller in concretes containing SF. 相似文献
92.
Zhen Li Xiao-Bao Li Mark E. Light Anna E. Carrillo Ana Arauzo Manuel Valvidares Claudio Roscini Francesc Teixidor Clara Viñas Felipe Gándara Elena Bartolomé José Giner Planas 《Advanced functional materials》2023,33(47):2307369
Multi-metallic multivariate (MTV) rare earth (RE) metal−organic frameworks (MOFs) are of interest for the development of multifunctional materials, however examples with more than three RE cations are rare and obstructed by compositional segregation during synthesis. Herein, this work demonstrates the synthesis of a multi-metallic MTV RE MOF incorporating two, four, six, or eight different RE ions with different sizes and in nearly equimolar amounts and no compositional segregation. The MOFs are formed by a combination of RE cations (La, Ce, Eu, Gd, Tb, Dy, Y, and Yb) and a 1,7-di(4-carboxyphenyl)-1,7-dicarba-closo-dodecaborane (mCB-L) linker. The steric bulkiness and acidity of mCB-L is crucial for the incorporation of different size RE ions into the MOF structure. Demonstration of the incorporation of all RE cations is performed via compositional and structural characterization. The more complex MTV MOF, including all eight RE ions (mCB-8RE), are also characterized using optical, thermal, and magnetic techniques. Element-selective X-ray absorption spectroscopy and X-ray Magnetic Circular Dichroism measurements allow us to characterize spectroscopically each of the eight RE ions and determine their magnetic moments. This work paves the way for the investigation of MTV MOFs with the possibility to combine RE ions à la carte for diverse applications. 相似文献
93.
Luis Quiles‐Carrillo Nestor Montanes Vicent Fombuena Rafael Balart Sergio Torres‐Giner 《Polymer International》2020,69(1):61-71
This work reports the enhancement of the processing window and of the mechanical and thermal properties of biopolymer blends of polyamide 1010 (PA1010) and bio‐based high‐density polyethylene (bio‐HDPE) at 70/30 (w/w) achieved by means of natural additives. The overall performance of the binary blend melt‐mixed without additives was poor due to both the relatively low thermal stability of bio‐HDPE at the processing temperatures of PA1010, that is, 210–240 °C, and the lack of or poor miscibility between the two biopolymers. Gallic acid, a natural phenolic compound, was added at 0.8 parts per hundred resin (phr) of biopolymer blend to enhance the thermal stability of the green polyolefin and therefore enlarge the processing window of the binary blend. Maleinized linseed oil, a multi‐functionalized vegetable oil, was then incorporated at 5 phr to compatibilize the biopolymers and the performance of the blend was also compared with that of a conventional petroleum‐derived copolymer, namely poly[ethylene‐co‐(acrylic acid)]. The resultant biopolymer blends showed a marked enhancement in thermal stability and also improved toughness when both natural additives were combined. This work can potentially serve as a sound base study for the mechanical recycling of similar blends containing bio‐based but non‐biodegradable polymers. © 2019 Society of Chemical Industry 相似文献
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95.
Shela Gorinstein Jerzy Drzewiecki Ami Sivan Simon Trakhtenberg Elena Katrich Joaquín Giner Robert Soliva-Fortuny Pedro Elez-Martíinez Olga Martín-Belloso 《European Food Research and Technology》2005,221(1-2):119-124
Some biochemical characteristics of Israeli Jaffa Star Ruby (red) and blond grapefruits were defined using atomic absorption spectrometry, antioxidant tests and the protein electrophoretic technique. It was found that the contents of dietary fibers, major and minor minerals, phenolic and ascorbic acids in both grapefruits were without significant differences. The contents of total polyphenols, anthocyanins and flavonoids were higher in red grapefruits, but also these differences were not significant. The antioxidant capacity was determined by two modified antioxidant methods, 2,2-azinobis(3-ethylbenzothiazoline-6-sulfonate) radical cation (ABTS+) and scavenging activity against nitric oxide, and was compared with the Folin–Ciocalteu assay. The two antioxidant assays used have shown that the antioxidant potential of the Star Ruby (red) grapefruit is higher than of the blond (P<0.05) grapefruit. Proteins were extracted and separated. Some small differences were found in the sodium dodecyl sulfate–protein bands in the region of 36 kDa. Antioxidants and proteins can be used for characterization of the quality of grapefruits as a fruit diet.S. Gorinstein: Affiliated with David R. Bloom Center for Pharmacy at the Hebrew University of Jerusalem, Jerusalem, Israel 相似文献
96.
Giner Alor-Hernández Cuauhtemoc Sánchez-Ramírez Guillermo Cortes-Robles Alejandro Rodríguez-González Jorge Luis García-Alcaráz Miguel Gastón Cedillo-Campos 《Computers in Industry》2014
The Service-Oriented-Architecture (SOA) development paradigm has emerged to make an improvement in critical situations such as creating, modifying and extending solutions in the domain of business processes integration. Web services technologies are considered as the main units for SOA, for both intra- and inter-enterprise communication. Nevertheless, SOA does not have information about the events that occurs in business processes, which represents the main characteristics of supply chain management. Taking this into account, this paper proposes a middleware-oriented integrated architecture with the use of semantic features (concretely with the use of Linked Data) as data provider to offer a brokerage service for the procurement of products in a Supply Chain Management (SCM). As main contributions, our system provides a hybrid architecture that combines features of both SOA and EDA between several others. 相似文献
97.
Luis Omar Colombo-Mendoza Giner Alor-Hernández Alejandro Rodríguez-gonzález Rafael Valencia-garcía 《Automated Software Engineering》2014,21(3):391-437
The integration of cloud computing and mobile computing has recently resulted in the Mobile Cloud Computing (MCC) paradigm which is defined as the availability of \(c\) loud services over a mobile ecosystem. Platform as a Service (PaaS) is a model of cloud computing that refers to high-level software systems delivered over Internet. This model typically enables developers to deliver Web applications as Software as a Service. With the aim of providing support to the MCC, in this work a PaaS called MobiCloUP! is proposed for mobile Web and native applications based on third-party cloud services such as Netflix, Instagram and Pinterest, to mention but a few. Unlike other commercial solutions such as force.com, Google \(^{\mathrm{TM}}\) App Engine and other academic proposals like MOSAIC, MobiCloUP! implements an automatic code generation programming model targeting rich mobile applications based on both Web standards such as HTML5, CSS3 and AJAX and Rich Internet Application frameworks like Adobe \(^{\textregistered }\) Flex. The MobiCloUP! core is a wizard tool that covers design, publish/deployment, development and maintenance phases for mobile development life-cycle. In order to validate our proposal, Web 2.0 services-based Web and native mobile applications were developed and deployed to the Cloud using MobiCloUP!. Finally, a qualitative-comparative evaluation was performed in order to validate the legitimacy of our proposal against other similar commercial proposals. 相似文献
98.
Vicent Giner‐Bosch Mónica Clemente‐Císcar Andrés Carrión 《Quality and Reliability Engineering International》2016,32(2):623-634
Pre‐control is a quality tool for quick set‐up approvals, especially used in short‐run processes. It is based on specifications instead of the natural variability of the process and uses cumulative counts in order to yield a conclusion. Its main drawbacks are a high false alarm rate and a low power to detect process deviations, under certain circumstances. These issues can be addressed by making the technique more flexible, as shown in previous works. In this paper, we introduce a Mathematical Programming approach in order to optimally determine the value of the pre‐control parameters, so that it can meet the user's requirements while minimizing the sample size of the technique as much as possible. We propose and develop a mathematical model for optimal pre‐control and perform some numerical experiments in order to show its effectiveness. Copyright © 2015 John Wiley & Sons, Ltd. 相似文献
99.
100.
The growth kinetic parameters of germinated cells from heat-activated spores of the psychrotrophic Bacillus cereus EPSO-35AS strain in nutrient broth (NB) and in tyndallized carrot broth (TCB) were evaluated at different temperatures (8, 12, and 16 degrees C) for control samples and for samples acidified with citric acid or lemon juice at pH values between 4.7 and 5.5. Lowering the pH from 7.4 or 6.2 to 5.2 inhibited bacterial growth in both tested media after 60 days at 12 degrees C and lower temperatures, confirming the effectiveness of acidification in association with refrigeration to control B. cereus proliferation in minimally processed foods (MPFs) based on carrot. The activities of selected concentrations of cinnamon essential oil, cinnamaldehyde, carvacrol, and eugenol against B. cereus EPSO-35AS and INRA TZ415 strains in both media over the same temperature range were also studied. Addition of either cinnamon essential oil or cinnamaldehyde at concentrations of 5 and 2 microL 100mL(-1), respectively, caused complete inhibition of the growth of both psychrotrophic strains even if mild temperature abuse occurred (12 degrees C). Hence, a combination of one of these compounds and refrigerated storage may be useful for preservation of MPFs in which major ingredient was carrot. On the contrary, carvacrol and eugenol were not able to prevent B. cereus growth in TCB during storage at 8 degrees C. Their effects on the organoleptic characteristics of TCB are discussed. 相似文献