Search results for "Efficiency"

TRANSITION METAL OXIDES AS SELECTIVE CONTACTS FOR C-SI SOLAR CELLS

2021

Impacts des réseaux viaires sur les mobilités urbaines : quelques illustrations

2008

This research aims to find the impact of the network shape and structure on the urban mobilities, in order to fight against the automobile dependency and to include the externalities in the network design. Three examples illustrate this objective. The first one shows the influence of the network shape on the pedestrian urban flows. The second one emphasizes how sensitive to the network structure is the efficiency of a very flexible Demand Responsive Transport. The third example demonstrates that the network metric is favourable to the automobile and how it can be possible to apply an alternative metric, called the “slow metric” to reduce the urban sprawling and the automobile dependency.

STUDIES AND RESEARCHES CONCERNING THE POSSIBILITY OF USING HYDROGEN IN TURBO ENGINES

2014

The paper aims to study the main aspects related to using Hydrogen as fuel in thermal engines, the advantages and disadvantages of using it as fuel and the technical posibilities of adjusting it, Hydrogen used as supplement at the main fuel and Hydrogen used as working fluid. As a perspective, it can be considered using Hydrogen as thermical agent in a closed energetic flux with thermo- chemical compression of Hydrogen in a hybrid heat changer, based on the heat of burning products of thermical engines. The experiments made showed that using such a way of using the heat of burning products of turbo engines can assure the increase of power and efficiency of the whole instalation with 20 %, w…

Evaluation of biogas production and usage potential

2016

The aim of the research is the development of theoretical and methodical bases for determining the feasibility of plant raw materials growing for its further bioconversion into energy resources and tec hnological materials to maximize profit from business activities. Monograph, statistics, modelling and abstract logical methods have been used during the research. Directions of biogas usage have been examined. Biogas yields from different crops have been analyzed. It has been determined that high methane yields can be provided from root crops, grain crops, and several green forage plants. So, forage beet and maize can provide more than 5,500 m3 of biogas per hectare. Attention is paid to the…

Vecāku pašefektivitāte un tās saistība ar bērna tempermentu pirmskolas vecumā

2015

Bakalaura darba mērķis ir noskaidrot, vai atšķiras tēvu un māšu pašefektivitāte un bērna tempermenta vērtējumi, vai pastāv saistība starp vecāku pašefektivitāti un bērna tempermentu, un vai atšķiras pašefektivitāte un bērnu tempermenta saistības tēviem un mātēm. Dati tika ievākti, izmantojot divas aptaujas- “Vecāku kompetences izjūtas skalas” (VKI/Parenting Sense of Competence Scale) apakšskalu “Efektivitāte” un Aptauja par bērnu tempermentu, ļoti īsais variants (Very Short Form of the Children’s Behavior Quetionnaire) (CBQ_VSF)) (Rothbart,Ahadi,Hershey&Fisher,2001)” kura ietver sevī trīs apakškalas: reaktivitāte, reakciju apzināta kontrole un negatīva emocionalitāte. Pētījumā piedalījās 90…

Performance indicators to assess water & wastewater service criticalities and investments efficiency and effectiveness in the Italian regulatory cont…

2017

Energy Efficient Optimization for Wireless Virtualized Small Cell Networks With Large-Scale Multiple Antenna

2017

Wireless network virtualization is envisioned as a promising framework to provide efficient and customized services for next-generation wireless networks. In wireless virtualized networks (WVNs), limited radio resources are shared among different services providers for providing services to different users with heterogeneous demands. In this paper, we propose a resource allocation scheme for an orthogonal frequency division multiplexing-based WVN, where one small cell base station equipped with a large number of antennas serves the users with different service requirements. In particular, with the objective to obtain the energy efficiency in the uplink, a joint power, subcarrier, and antenn…

Computer Networks

2018

This book constitutes the thoroughly refereed proceedings of the 25th International Conference on Computer Networks, CN 2018, held in Gliwice, Poland, in June 2018. The 34 full papers presented were carefully reviewed and selected from 86 submissions. They are organized in topical sections on computer networks; teleinformatics and telecommunications; queueing theory; cybersecurity and quality service.

Online ^{222}Rn removal by cryogenic distillation in the XENON100 experiment

2017

International audience; We describe the purification of xenon from traces of the radioactive noble gas radon using a cryogenic distillation column. The distillation column was integrated into the gas purification loop of the XENON100 detector for online radon removal. This enabled us to significantly reduce the constant$^{222}$ Rn background originating from radon emanation. After inserting an auxiliary$^{222}$ Rn emanation source in the gas loop, we determined a radon reduction factor of $R\,>\,27$ (95% C.L.) for the distillation column by monitoring the$^{222}$ Rn activity concentration inside the XENON100 detector.

La mesure de l'efficacité scolaire par la méthode de l'enveloppe : test des filières alternatives de recrutement des enseignants dans le cadre du pro…

2009

Data envelopment and school effectiveness: contract teachers' efficiency compared to civil servants in the Education for all process) In the context of EFA process, countries, in general the most depressed LDC, both constrained by scarcity of funding and urgency for expanding school access have set up new tracks for teacher recruitment on annually renewable contracts. Those teachers are often not professionally trained in regards with traditional pedagogical curricula. They receive much lower salaries than regular civil service teachers. This has been a controversial policy, but there is very limited evidence on the effectiveness or failure of contract teachers in improving student learning…