Search results for "SHM"

Ancistectorine D, a naphthylisoquinoline alkaloid with antiprotozoal and antileukemic activities, and further 5,8'- and 7,1'-linked metabolites from …

2016

From the twigs and stems of the Chinese liana Ancistrocladus tectorius (Ancistrocladaceae), two new 5,8'-coupled naphthylisoquinolines, ancistectorine D (5) and its 6-O-demethyl derivative 6, were isolated, along with two new 7,1'-linked alkaloids, 6-O-methylancistectorine B1 (7) and ancistectorine B2 (8). Two further compounds, ancistroealaine A (4) and 6-O-demethyl-8-O-methyl-7-epi-ancistrobrevine D (10), already known from related Asian and African Ancistrocladus species, were discovered for the first time in A. tectorius. The structure elucidation was achieved by spectroscopic analysis including HRESIMS, 1D and 2D NMR, and by chemical (oxidative degradation) and chiroptical (circular di…

A Study on Engineering Freshman Conceptual Understanding of Newtonian Mechanics

2021

Force concept inventory is a multiple-choice questionnaire commonly used to assess students’ conceptual understanding of Newtonian mechanics. We here show that a cluster analysis method can be used to study student answers to the force concept inventory to investigate their understanding of Newtonian mechanics and provide new insights into the use of the force concept inventory. We identi- fied groups of students characterized by similar correct answers as well as by non- correct answers to the questionnaire, whose analysis allowed us to highlight student misconceptions/non-normative conceptions. Such an analysis of student answers gave us insights into the relationships between the student…

Costly punishment prevails in intergroup conflict.

2011

Understanding how societies resolve conflicts between individual and common interests remains one of the most fundamental issues across disciplines. The observation that humans readily incur costs to sanction uncooperative individuals without tangible individual benefits has attracted considerable attention as a proximate cause as to why cooperative behaviours might evolve. However, the proliferation of individually costly punishment has been difficult to explain. Several studies over the last decade employing experimental designs with isolated groups have found clear evidence that the costs of punishment often nullify the benefits of increased cooperation, rendering the strong human tenden…

Evaluation of an Optical Energy Harvester for SHM Application

2019

Abstract In this paper a preliminary study on an array configuration of rectified optical nanoantennas for energy harvesting application is proposed. Currently, the major impediments for the use of the rectified optical nanoantenna known as rectenna are the relatively low conversion efficiency and low power transfer to the load, both of them caused mainly by the mismatch between the impedance of the rectifier (several kilo ohms) and that of the antenna (hundreds of ohm). For this reason, the design of the array represents a crucial point to obtain the maximum energy transfer from the rectenna to the load, represented as a typical DC/DC boost power converter, and modeled by an equivalent inp…

Revisiting “Schumacker”: Source, Residence and Citizenship in the ECJ Case Law on Direct Taxation

2013

ECJ case law on direct taxation has been very important in the development of the international dimension of direct tax systems of EU Member States. Through the application of the non-discrimination principle and the requirements of the fundamental freedoms, some of the basic structures of the implementation of income tax systems have been revised to accommodate to the needs of the single market. However, the requirements of the EU single market are fundamentally incompatible with the assumptions that have served to build the criteria under which modern income tax systems have been developed (worldwide income taxation, residence vs source, unlimited vs limited tax liability, credit vs exemp…

Las guerras secretas de EEUU - La irresistible tentación terrorista

2003

The nationality of companies in French law

2012

The development of international economic relations and the construction of an integrated European area, both from an economic and a political point of view, has revived the debate on the nationality of trading companies. The question is not so much whether trading companies have a nationality on an equal footing with natural persons – solutions have long been accepted by international doctrine and jurisprudence – but rather to determine how this notion has evolved and adapted to the constraints on the one hand, of a globalized market economy and, on the other hand, of European Union law which overturns the traditionally accepted solutions of nationality of trading companies into the legal …

La guerra ideológica

1982

Manifiesto firmado por sesenta intelectuales norteamericanos en apoyo a la guerra de Afganistán y las otras guerras "contra los países del Eje del Mal" anunciadas por Bush tras el 11-S.

Predicting University Adjustment from Coping-Styles, Self-Esteem, Self-Efficacy, and Personality: Findings from a Survey in a Sample of Italian Stude…

2021

Starting university life requires that students learn to cope with several personal, academic, and social challenges. A wide array of variables affects how students adjust to university life. This study was aimed to investigate which factors among coping styles, self-esteem, self-efficacy, and personality traits (i.e., diligence, relational availability, mental flexibility, activity, and emotional stability) best predicted the levels of university adjustment in a sample of university freshmen (N = 204, 63% women). Data were collected using self-report instruments. Multiple regressions analyses were conducted to identify the most significant predictors of adjustment to college. Our findings …

A fast BEM for the analysis of damaged structures with bonded piezoelectric sensors

2010

A fast boundary element method for the analysis of three-dimensional solids with cracks and adhesively bonded piezoelectric patches, used as strain sensors, is presented. The piezoelectric sensors, as well as the adhesive layer, are modeled using a 3D state-space finite element approach. The piezoelectric patch model is formulated taking into account the full electro-mechanical coupling and embodying the suitable boundary conditions and it is eventually expressed in terms of the interface variables, to allow a straightforward coupling with the underlying host structure, which is modeled through a 3D dual boundary element method, for accurate analysis of cracks. The technique is computationa…