Structural and conformational changes in [M(1,10-diaza-18-crown-6)Cl2] (M = Pd, Pb) complexes: a crystallographic and theoretical study

CrystEngComm ◽  
2018 ◽  
Vol 20 (42) ◽  
pp. 6733-6740 ◽  
Author(s):  
Antonino Arenaza-Corona ◽  
David Morales-Morales ◽  
Iran F. Hernández-Ahuactzi ◽  
Victor Barba
Keyword(s):  
Conformational Changes ◽  
Theoretical Study ◽  
Solvent System ◽  
Selection Of ◽  
Solvent Solvent

The appropriate selection of a given solvent/solvent system influences directly the molecular conformational structures of MLX2 complexes.

scholarly journals Framework built on resource based view for outsourcing strategy on hiring logistics service provider

2018 ◽  
Vol 25 (3) ◽  
pp. 458-484 ◽  
Author(s):  
Geraldo Cardoso de Oliveira Neto ◽  
Moacir Godinho Filho ◽  
Marilson Alves Gonçalves ◽  
Benny Kramer Costa ◽  
Dirceu da Silva ◽  
...  
Keyword(s):  
Supply Chain ◽  
Service Provider ◽  
Theoretical Study ◽  
Resource Based View ◽  
Chain Management ◽  
Logistics Service ◽  
Logistics Service Provider ◽  
Outsourcing Logistics ◽  
Selection Of ◽  
Operational Structure

Abstract The process of Outsourcing Logistics Service (OLS) is deemed incipient in the management of organizations, not only because of the operational problems it presents, but also of its difficulties fitting into the company’s overall strategy. The present theoretical study, building on the resource-based view of the firm, aims to propose a framework that guides managers in developing strategies to OLS starting from the operational structure to establish the necessary resources, capabilities, and routines. In addition, taken into account is the importance of analyzing risks and resilience in the environment, concomitantly with the analysis of the operational structure. Thus, four questions were developed, aimed at leading operations managers to reflect on the development of the strategy. The framework proposed for OLS considers the supply chain management department as the main interlocutor of the strategy. This framework can be adapted according with the necessity of the contracting company, and its main intention is to enable the establishment of a project that contemplates the necessary resources, the capabilities (criteria), and the operational routines (subcriteria) for the selection of a logistics service provider in the market, one which truly addresses the needs of the organization. This framework is already intrinsic in the practical actions of the authors, because of their extensive advisory activity over the last five years in OLS to logistics service provider. In addition, it is worth mentioning that so far in the tacit applications of this framework there has been no application similar to another.

scholarly journals Synthesis conditions influencing formation of MAPbBr3 perovskite nanoparticles prepared by the ligand-assisted precipitation method

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Anna Jancik Prochazkova ◽  
Markus Clark Scharber ◽  
Cigdem Yumusak ◽  
Ján Jančík ◽  
Jiří Másilko ◽  
...  
Keyword(s):  
Optical Properties ◽  
Colloidal Stability ◽  
Precursor Solution ◽  
Solvent System ◽  
Precipitation Method ◽  
Colloidal Solutions ◽  
Capping Agents ◽  
Synthesis Conditions ◽  
Perovskite Nanoparticles ◽  
Selection Of

Abstract This work reports on an optimized procedure to synthesize methylammonium bromide perovskite nanoparticles. The ligand-assisted precipitation synthetic pathway for preparing nanoparticles is a cost-effective and promising method due to its ease of scalability, affordable equipment requirements and convenient operational temperatures. Nevertheless, there are several parameters that influence the resulting optical properties of the final nanomaterials. Here, the influence of the choice of solvent system, capping agents, temperature during precipitation and ratios of precursor chemicals is described, among other factors. Moreover, the colloidal stability and stability of the precursor solution is studied. All of the above-mentioned parameters were observed to strongly affect the resulting optical properties of the colloidal solutions. Various solvents, dispersion media, and selection of capping agents affected the formation of the perovskite structure, and thus qualitative and quantitative optimization of the synthetic procedure conditions resulted in nanoparticles of different dimensions and optical properties. The emission maxima of the nanoparticles were in the 508–519 nm range due to quantum confinement, as confirmed by transmission electron microscopy. This detailed study allows the selection of the best optimal conditions when using the ligand-assisted precipitation method as a powerful tool to fine-tune nanostructured perovskite features targeted for specific applications.

A Theoretic Study on Cam-Clamping Device

2011 ◽  
Vol 295-297 ◽  
pp. 1536-1539 ◽  
Author(s):  
Yuan Chao Deng
Keyword(s):  
Simple Structure ◽  
Theoretical Study ◽  
Low Cost ◽  
The Self ◽  
Clamping Force ◽  
Locking Mechanism ◽  
Different Types ◽  
Cam Profile ◽  
Clamping Device ◽  
Selection Of

A theoretical study has been made on the cam-clamping device. In this article, we consider specifically the calculations of cam geometry, calculations of clamping force and clamping torque, conditions for self-locking, and conditions for contact strength. Machine fixtures are essential in the process of mechanical manufacturing. There are many different types of fixtures, such as manual jig, pneumatic clamps, hydraulic fixtures, electric fixtures, etc. There are also many ways of clamping, such as incline clamp, screw clamp, eccentric circle clamp, hinge clamp [1], among which the eccentric circle clamp finds wide applications, especially in fast-clamping devices. Although the circular eccentric fixture possesses the advantages of simple structure, convenient manufacturing, and low cost, it suffers the drawbacks of small clamping force, short clamping-surface travel distance, and unreliable self-locking mechanism. The cam-clamping device discussesed in this article involves replaceing the eccentric circle with a cam, as shown in Fig. 1. The cam profile curve can be designed according to any requirements. The advantages of this replacement are obvious, in addition to preserving the advantages of the circular eccentric fixture, the cam-clamping can be designed according to the actual needs of clamping paths and selection of the appropriate cam profile to improve the self-locking.

scholarly journals A Theoretical Investigation of an Overhung Flexible Rotor Mounted on Uncentralized Squeeze-Film Damper Bearings and Flexible Supports

1982 ◽  
Author(s):  
R. A. Cookson ◽  
Xin-Hai Feng
Keyword(s):  
Theoretical Study ◽  
Effective Means ◽  
Complex Model ◽  
Squeeze Film ◽  
Flexible Rotor ◽  
Squeeze Film Damper ◽  
Surrounding Structure ◽  
Turbine Disc ◽  
Flexible Supports ◽  
Selection Of

Previous investigations have shown that the uncentralized type of squeeze-film damper is an effective means of reducing the transmission of unbalance forces into the supporting structure. In this theoretical study a more complex model, which includes an overhung “fan” disc and a noncentral “turbine” disc, has been employed. This model represents the conventional gas turbine somewhat closer than does the previously studied single disc system. This investigation has shown that it is possible to minimize the force transmitted into the surrounding structure by a careful selection of squeeze-film damper characteristics, although it may be found that some larger amplitudes of motion accompany the minimized transmissibility.

Theoretical Study of the Microsolvation of the Bromide Anion in Water, Methanol, and Acetonitrile:  Ion−Solvent vs Solvent−Solvent Interactions

2000 ◽  
Vol 104 (12) ◽  
pp. 2799-2807 ◽  
Author(s):  
Regla Ayala ◽  
José M. Martínez ◽  
Rafael R. Pappalardo ◽  
Enrique Sánchez Marcos
Keyword(s):  
Theoretical Study ◽  
Solvent Interactions ◽  
Bromide Anion ◽  
Solvent Solvent

scholarly journals PSYCHOMETRIC PROPERTIES OF MEASUREMENT INSTRUMENTS: CONCEPTUAL BASIS AND EVALUATION METHODS - PART II

2019 ◽  
Vol 28 ◽  
Author(s):  
Maria Elena Echevarría-Guanilo ◽  
Natália Gonçalves ◽  
Priscila Juceli Romanoski
Keyword(s):  
Patient Reported Outcomes ◽  
Theoretical Study ◽  
Criterion Validity ◽  
Measurement Properties ◽  
Measuring Instruments ◽  
Measurement Instruments ◽  
Health Measurement ◽  
Patient Reported ◽  
Selection Of

ABSTRACT Objective: to present and discuss conceptual bases and methods for evaluating the content, construct and criterion validity of self-reported measuring instruments. Method: theoretical study based on the concepts of the Consensus-based Standards for the Selection of Health Measurement Instruments and those evaluated in the Evaluating the Measurement of Patient-Reported Outcomes, which includes concepts of instrument assessment to assess patient-reported outcomes. Results: validity is significant for the methodological quality of an instrument; however, it is a relative criterion, since it depends on the adequacy of the instrument to be measured. There are three different validity measurement properties described in the literature: content, construct and criterion validity. Conclusions: as validity is an important property, it is recommended that it be verified in studies that aimed to develop new scales and in those that adapted and validated for another culture or population.

scholarly journals Legal relations peculiarities as a subject of legal regulation in the complex law branch

2020 ◽  
Vol 5 (5) ◽  
pp. 15-22
Author(s):  
Lyudmyla Dobroboh
Keyword(s):  
Public Relations ◽  
Natural Resources ◽  
Environmental Protection ◽  
Theoretical Study ◽  
Environmental Law ◽  
Legal Regulation ◽  
Future Generations ◽  
The Subject ◽  
Selection Of

The article deals with theoretical study of the selection of specific features of legal relations of complex lawbranches on the example of environmental law. Today, the subject of legal regulation in this area is public relations for environmental protection and rational use of natural resources in order to ensure the quality of the environment in the interests of present and future generations.

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