Search results for "Interlock"

A [13]rotaxane assembled via a palladium molecular capsule

2019

Molecules that are the size of small proteins are difficult to make. The most frequently examined route is via self-assembly, and one particular approach involves molecular nanocapsules, where ligands are designed that will enforce the formation of specific polyhedra of metals within the core of the structure. Here we show that this approach can be combined with mechanically interlocking molecules to produce nanocapsules that are decorated on their exterior. This could be a general route to very large molecules, and is exemplified here by the synthesis and structural characterization of a [13]rotaxane, containing 150 metal centres. Small angle X-ray scattering combined with atomistic molecu…

Correction of Long Vehicle Off Tracking by Multiple Axle Steering

2019

When planning the road vehicles for the transport of passengers or goods, engineers should take care to contrast some undesirable phenomena in the lateral dynamics, such as high-speed instability or off tracking. While the former is less troubling in the slow heavy vehicles, the latter is a serious problem due to the risk of invading the neighbouring lanes. The use of multi-wheel steering may completely cancel this drawback and, pursuing an optimized correlation among the steering angles, a functional inter-dependence based on the cubic “witch of Agnesi” is found to be very promising. Simple control systems with electromechanical or electronic components may be easily implemented for the mu…

Les effets des liens personnels interconseils sur la performance de l'entreprise : une analyse comparée entre France et Allemagne

2010

Obgleich das Thema „personelle Unternehmensverflechtungen über den Aufsichtsrat“ re-gelmäßig im Fokus öffentlicher Diskussionen steht – wobei in der Regel eine negative Wirkung der Mandatekumulation auf die Kontrolleffizienz des Überwachungsgremiums und damit letztlich auf die Unternehmensperformance unterstellt wird –, zeigt eine Analyse der empirischen Litera-tur, dass insbesondere in Kontinentaleuropa eine klare Schlussfolgerung hinsichtlich der Wirkung von Mehrfachmandaten auf die Wertschöpfung für die Aktionäre nicht möglich ist. Ursache für die starke Divergenz der Ergebnisse scheint sowohl die Verwendung verschiedener theoretischer Erklärungsmodelle als auch die Mobilisierung untersc…

ChemInform Abstract: Interlocking Inorganic Screw Helices: Synthesis, Structure, and Magnetism of the Novel Framework Uranium Orthothiophosphates A11…

2010

Virtual prototyping of a new intramedullary nail for tibial fractures

2012

In this work a new distal interlocking system has been developed which is easy to use, allows a reduction of the operating time and consequently the exposure to radiations both for surgeon and patient. The main goal of this study has been the design of a new intramedullary nail for tibial fractures able to simplify and speed up the distal locking operation phases. After a preliminary stage during which several candidate concepts have been proposed and analysed, the best solution has been developed and deeply investigated. The new system, called “expansion nail”, has been firstly modelled by setting up a full parametric CAD model and, then, tested by running non linear FEM analyses to evalua…

An implant-supported overdenture design with a horizontal path of insertion

2013

The rehabilitation of the atrophic maxilla by means of implant-supported prostheses cannot always be achieved with fixed prostheses because of anatomic, esthetic, or economic issues, so for some patients the treatment of choice is a removable prosthesis. This article analyzes a new design for implant-supported overdentures with horizontal or faciolingual insertion. Its retention system is based on frictional forces or stepped interlocking horizontal surfaces and is appropriate for patients with skeletal Class II or III relationships with severe maxillary atrophies. The design facilitates implant-prosthetic hygiene and improved esthetics in patients with nonparallel implants by hiding abutme…

Reconfigurable control of robotized manufacturing cells

2007

This paper investigates the field of manufacturing system control. The addressed subject is indeed very fascinating, due to the importance that it has reached in the last decades both at research and industrial level. On the other hand, it seems to the author that most of the complexity intrinsic to the subject itself relies on the different meanings or levels of abstraction that both the terms ''manufacturing system'' and ''control'' may symbolize. The presented research aims to face the topic in a concrete fashion, i.e., by developing a control software system for a specific, although easy to be generalized, robotized manufacturing cell. Two different development methodologies, from the c…

Integration of interlock system analysis with automated HAZOP analysis

2001

Abstract The paper details the integration of a method for the analysis of interlock systems with a software support system for HAZOP analysis. The proposed software aims to enhance the potential of HAZOP in terms of depth and efficiency of the analysis. This enhancement is reached through the continuation of the hazard and operability analysis, limited to a group of events which may hold high risks for the plant and/or surrounding environment. The analysis technique of the emergency interlock systems and other plant protection measures proposed by the Center for Chemical Process Safety (CCPS) of the American Institution of Chemical Engineers (AIChE) has been assumed as a starting point. Th…

Corporate Networks and business influence in Panama, Costa Rica, and El Salvador.

2021

Objective/Context: This paper explores the relationship between corporate networks and business influence to figure out the conditions of state capture. Methodology: We analyze corporate networks through interlocking directorates in three Central American countries - Panama, Costa Rica, and El Salvador - using network analysis, and we pinpoint the relationship between the structure of the corporate network and two corporate political actions: contributions to presidential campaigns and revolving doors. Conclusions: Results show corporate networks were fragmented in the three Central American countries, except for a well-connected business cluster in Panama. The organization of business elit…

The interaction between inter-firm and interlocking directorate networks on firm's new product development outcomes

2016

This paper explores the interaction between a prominent board of directors and the network of inter-firm rela- tionships on new product development. Specifically, we posit a positive interaction effect between a prominent board and the inter-firm network and structural holes positions on the number of new products developed by the firm. We test the theoretical framework on a sample of 1758 agreements among 1890 biopharmaceutical firms over the period 2006–2010. We find that by filtering, complementing and legitimizing information coming from the inter-firm network, a prominent interlocking directorate network can improve the inter-firm network's effects on new product development. We discus…