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排序方式: 共有135条查询结果,搜索用时 152 毫秒
1.
Casalaro Giuseppina Lucia Cattivera Giulio Ciccozzi Federico Malavolta Ivano Wortmann Andreas Pelliccione Patrizio 《Software and Systems Modeling》2022,21(1):19-49
Software and Systems Modeling - Mobile robots operate in various environments (e.g. aquatic, aerial, or terrestrial), they come in many diverse shapes and they are increasingly becoming parts of... 相似文献
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Expanding the application field of post‐consumer poly(ethylene terephthalate) through structural modification by reactive blending 下载免费PDF全文
With the aim of up‐grading the material properties of post‐consumer PET, making them suitable for extrusion of thermoformable thick sheets, a series of polyepoxy chain extenders have been comparatively evaluated as melt viscosity modifiers for a toughened compatibilized blend containing up to 80 wt % of bottle‐grade post‐consumer recycled poly(ethylene terephtalate) (r‐PET). Combinations of a commercial modifier with pentaerythritol were also successfully employed to cause simultaneous hyperbranching and controlled chain scission, thereby modifying the melt rheology of the material without excessively increasing the molecular weight, as highlighted by common technological melt viscosity measurements such as online torque and off‐line melt flow rate (MFR). Since the high melt fluidity of PET plays a critical role on its flame resistance, the combined effect of chain extenders and halogen‐free phosphorated additives on the fire resistance of the modified toughened blends was also investigated. Preliminary results indicate that the chemical reactions among polymer and additives must be taken into careful account to prevent unfavorable effects on the ultimate melt rheology and mechanical properties. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014 , 131, 40881. 相似文献
3.
Patrizio Raffa Adamantia Kassi Julian Gosschalk Nicola Migliore Lorenzo Massimo Polgar Francesco Picchioni 《大分子材料与工程》2021,306(4):2000755
A series of copolymers of styrene and furfuryl methacrylate characterized by various molecular structures (linear and star, block and random) is synthesized via atom transfer radical polymerization, and cross-linked with a bismaleimide by means of thermally reversible Diels–Alder (DA) reaction, to obtain self-healing materials. The prepared materials are studied in terms of gelation, swelling, thermal, and dynamic-mechanical analysis, with the aim of correlating relevant properties to their chemical structure. It is found that the furan/styrene ratio, as well as the molecular architecture, have a major influence on the properties. It is also found that the reversibility of the DA reaction is not complete in the solid state for materials with high cross-linking density. This study provides some important tools for the design of materials characterized by thermally reversible behavior, which find usually application as self-healing thermosets, coatings, or adhesives. 相似文献
4.
Yuri Prozzillo Stefano Cuticone Diego Ferreri Gaia Fattorini Giovanni Messina Patrizio Dimitri 《International journal of molecular sciences》2021,22(9)
Chromatin organization is developmentally regulated by epigenetic changes mediated by histone-modifying enzymes and chromatin remodeling complexes. In Drosophila melanogaster, the Tip60 chromatin remodeling complex (dTip60) play roles in chromatin regulation, which are shared by evolutionarily-related complexes identified in animal and plants. Recently, it was found that most subunits previously assigned to the dTip60 complex are shared by two related complexes, DOM-A.C and DOM-B.C, defined by DOM-A and DOM-B isoforms, respectively. In this work, we combined classical genetics, cell biology, and reverse genetics approaches to further investigate the biological roles played during Drosophila melanogaster development by a number of subunits originally assigned to the dTip60 complex. 相似文献
5.
Biever Joan L.; Gómez John P.; González Cynthia G.; Patrizio Nina 《Canadian Metallurgical Quarterly》2011,5(2):81
The competent delivery of mental health services to Spanish-speaking clients requires knowledge of Latino cultures, racial and ethnic identity development, variables that impact service delivery, and the Spanish language. We present the Psychological Services for Spanish Speaking Populations (PSSSP) program as a model for training mental health professionals to deliver services to Spanish-speaking clients. The goals for the program were to improve participants' oral and written Spanish language proficiency in work-related contexts and to improve multicultural competence in service delivery to Latino clients. Recommendations for those who wish to offer similar programs include (a) grouping trainees according to Spanish language proficiency, (b) using Spanish language instructors with expertise in teaching heritage language learners, and (c) developing criterion references or measures to assess program outcomes. (PsycINFO Database Record (c) 2011 APA, all rights reserved) 相似文献
6.
Daniele Passeri Ugo Sassi Andrea Bettucci Emanuela Tamburri Francesco Toschi Silvia Orlanducci Maria Letizia Terranova Marco Rossi 《Advanced functional materials》2012,22(14):2956-2963
The thermoacoustic effect of isolated single‐wall carbon nanotubes aligned between electrodes is experimentally observed for the first time by imaging the emitted acoustic wave using an atomic force microscopy‐based technique specifically developed for the task. The capability of such a technique for single‐point thermoacoustic measurements is first verified on carbon nanotubes layers with two electrodes for injecting alternate electric current. The technique is then demonstrated to allow the acquisition, simultaneously with the topography, of images reflecting the pressure of the acoustic wave at fixed distance from the sample. Such a capability is used to collect images reflecting the amplitude of acoustic waves generated by isolated nanotubes and nanotube bundles by the thermoacoustic effect. 相似文献
7.
Patrizio Neff Antje Sydow Christian Wieners 《International journal for numerical methods in engineering》2009,77(3):414-436
We investigate a representative model of continuum infinitesimal gradient plasticity. The formulation is an extension of classical rate‐independent infinitesimal plasticity based on the additive decomposition of the symmetric strain tensor into elastic and plastic parts. It is assumed that dislocation processes contribute to the storage of energy in the material whereby the curl of the plastic distortion appears in the thermodynamic potential and leads to an additional nonlocal backstress tensor. The formulation is cast into a numerical framework by a saddle point approximation of the corresponding minimization problem in each incremental loading step. This allows one to reformulate the (nonlocal) dissipation inequality to a point‐wise flow rule and yields a solution scheme, which is a direct extension of the standard approach in classical plasticity. Our numerical results show the regularizing effects of the additional physically motivated terms. Copyright © 2008 John Wiley & Sons, Ltd. 相似文献
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9.
Invariant representations of discrete-time periodic systems 总被引:2,自引:0,他引:2
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