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تعداد نتایج: 17220170 فیلتر نتایج به سال:
Cloud computing service is an evolving paradigm that affects a large part of the ICT industry and provides new opportunities for ICT service providers such as the deployment of new business models and the realization of economies of scale by increasing efficiency of resource utilization. However, despite benefits of cloud services, there are some obstacles to adopt such as lack of assessing and...
Conducting business and offering e-government services in the global digital environment present important questions of the legal validity of electronic documents and complex issues of trust and authentication. Governments and policy experts have grappled with ways to provide certainty and trust to businesses and citizens engaging in transactions online. One solution that has received considera...
Even small companies do not use physical stamps to prepay postal services, but have a franking machine which can be logically loaded with a certain amount of stamps which are printed on letters for example. Special purpose franking machines, which are still widely used in practice, however have security and handling problems. It was relatively easy to forge stamps and in some cases one needed t...
Introduction: Reducing health care costs and providing high quality health care services are of prime importance. The present study aims to employ the concept of electronic service quality in health care industry to provide a framework for analysis and evaluation of electronic health care services. Methods: This study was conducted between 2012 and 2013, and the data collection was done in ...
In future Cloud ecosystems, brokers will mediate between service providers and consumers, playing an increased role in quality assurance, checking services for functional compliance to agreed standards, among other aspects. To date, most Software-as-a-Service (SaaS) testing has been performed manually, requiring duplicated effort at the development, certification and deployment stages of the se...
in this thesis, a better reaction conditions for the synthesis of spirobarbiturates catalyzed by task-specific ionic liquid (2-hydroxy-n-(2-hydroxyethyl)-n,n-dimethylethanaminium formate), calcium hypochlorite ca(ocl)2 or n-bromosuccinimide (nbs) in the presence of water at room temperature by ultrasonic technique is provided. the design and synthesis of spirocycles is a challenging task becaus...
in this thesis, a new optically active poly(amide-imide) (pai) was synthesized by the indirect polycondensation reaction of the l-phenylalanine based diacid chloride and 4,4?-diaminodiphenylether in the presence of triethylamine in n-methyl-2-pyrrolidone. the formation of pai was confirmed by ftir, 1h nmr and elemental analysis. in next step, the surface of titanium dioxide (tio2) nanoparticles...
previous studies have aimed at testing a hypothesis but the present study is data-first research in which researcher tries to form a theory from data rather than the use of data to test a hypothesis. this study aims at exploring teachers perceptions of the strengths and weaknesses of the current syllabus for college preparatory course. eight experienced teachers were selected to collect data du...
abstract in first part of this project, the use of a new and biguanid-like catalyst supported on silica as a recyclable catalyst provides a new route for the synthesis of a variety of arylalkylidene rhodanine derivatives through knoevenagle reaction in at present of solvent at room temperature. rhodanine derivatives and especially arylalkylidene rhodanines have proven to be attractive compound...
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