Browsing
     by title


0-9 A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

or enter first few letters:   
OK
Full Text
Peer Reviewed
See detailEconomic Optimization of Small Scale Organic Rankine Cycles
Tchanche, Bertrand; Quoilin, Sylvain ULg; Declaye, Sébastien ULg et al

(2010, June)

The present paper focuses on the economic optimization of a small scale ORC in waste heat recovery application with specific investment cost as objective function. First, a pre-design model of the ORC was ... [more ▼]

The present paper focuses on the economic optimization of a small scale ORC in waste heat recovery application with specific investment cost as objective function. First, a pre-design model of the ORC was built and simulations run with different working fluids to evaluate their technical performance. In a second step, components and system cost models were built and simulations carried out to evaluate the cost effectiveness of systems associated with different fluids. The working fluids considered are R245fa, R123, R113, n-Pentane and n-Butane. Results indicate that for the same fluid, the point of high performance and that f cost-effectiveness do not match. The operating point for maximum power doesn’t correspond to that of the minimum specific investment cost. For n-Pentane, the maximum net power of 1.98 kW is obtained for an evaporator pressure of 5.14 bar and the specific investment cost is 5450 €/kW. For this same fluid, a minimum specific investment cost of 4440 €/kW is obtained for an evaporator pressure of 8.5 bar and the corresponding power output is 1.745 kW. The mismatch aforementioned is due to the thermodynamic properties such as liquid/vapour densities, which significantly influence system performance and components sizes. Seeking for profitable environmental solutions, economic optimization as a necessary step in the optimization of any thermodynamic system is highly advised. [less ▲]

Detailed reference viewed: 474 (22 ULg)
Full Text
Peer Reviewed
See detailThe Economic performance of self-managed firms: a comparative perspective
Defourny, Jacques ULg

in Annals of Public and Cooperative Economics = Annales de l'Economie Publique, Sociale et Coopérative (1986), (1), 3-9

Detailed reference viewed: 27 (5 ULg)
Full Text
Peer Reviewed
See detailEconomic resilience of Genocide widows of AVEGA in Eastern Province of Rwanda
Militery Ngamata, Olivier ULg; Mbonyinkebe, Deo; Lebailly, Philippe ULg

Conference (2013)

AVEGA is a non-profit making organization of Rwanda genocide widows which was established in 1995. It renders and performs its activities all over Rwanda. It is comprised of 20,312 widows and 71,478 of ... [more ▼]

AVEGA is a non-profit making organization of Rwanda genocide widows which was established in 1995. It renders and performs its activities all over Rwanda. It is comprised of 20,312 widows and 71,478 of their dependants, mainly orphans (AVEGA, Annual report, 2012).The association helps widows and their dependents escape the poverty, anguish and misery that filled their lives following the genocide of 1994. It works with others partners to improve the social economic conditions of members. This paper analyses focus on the Eastern Province Branch and examines the social economic resilience of different projects realized, among them livestock projects, handcraft projects, business projects, crop husbandry such as the pepper project, and the livelihood program, in one hand; in other hand, the association had put in place some projects which help to produce revenue for the finance himself. The establishment of these economic activities for widows (individually or cooperatives) has improved the welfare and living standards of the beneficiaries and has taught them to initiate and maintain sustainable projects rather than to be too reliant on others. This has helped to rebuild the confidence of beneficiaries, and though many still endure extreme poverty, it has helped them to make a step towards greater independence. [less ▲]

Detailed reference viewed: 33 (7 ULg)
Full Text
Peer Reviewed
See detailEconomic Statistical Design of a T2 Control Chart with Double Warning Lines
Faraz, Alireza ULg; Saniga, Erwin

in Quality and Reliability Engineering International (2011), 27(2), 125-139

Recent studies have shown that enhancing the common T2 control chart by using variable sample sizes (VSS) and variable sample intervals (VSI) sampling policies with a double warning line scheme (DWL ... [more ▼]

Recent studies have shown that enhancing the common T2 control chart by using variable sample sizes (VSS) and variable sample intervals (VSI) sampling policies with a double warning line scheme (DWL) yields improvements in shift detection times over either pure VSI or VSS schemes in detecting almost all shifts in the process mean. In this paper, we look at this problem from an economical perspective, certainly at least as an important criterion as shift detection time if one considers what occurs in the industry today. Our method is to first construct a cost model to find the economic statistical design (ESD) of the DWL T2 control chart using the general model of Lorenzen and Vance (Technometrics 1986; 28:3–11). Subsequently, we find the values of the chart parameters which minimize the cost model using a genetic algorithm optimization method. Cost comparisons of Fixed ratio sampling, VSI, VSS, VSIVSS with DWL, and multivariate exponentially weighted moving average (MEWMA) charts are made, which indicate the economic efficacy of using either VSIVSS with DWL or MEWMA charts in practice if cost minimization is of interest to the control chart user. [less ▲]

Detailed reference viewed: 42 (11 ULg)
Full Text
Peer Reviewed
See detailEconomic Statistical Design of the VP( X) ̅ Control Charts for Monitoring a Process under Non-normality
Seif, Asghar; Faraz, Alireza ULg; Saniga, Erwin

in International Journal of Operational Research (2014)

Recent studies proved that variable parameters (VP) X ̅ control charts not only detects process mean shifts quicker than the classical X ̅ control chart but also has better economic properties ... [more ▼]

Recent studies proved that variable parameters (VP) X ̅ control charts not only detects process mean shifts quicker than the classical X ̅ control chart but also has better economic properties. Furthermore, like most papers in control chart design, the fundamental assumption is that process data are normally distributed. Nevertheless, process quality variables may not be normal in application. In this paper, we investigate the economic statistical design of the VP X ̅ control chart when the underlying process distribution is non-normal. We illustrate the design procedure and perform a sensitivity analysis on the process and cost parameters based upon the degrees of skewness and kurtosis of the population using an industrial application. [less ▲]

Detailed reference viewed: 47 (9 ULg)
Peer Reviewed
See detailEconomic, Clinical and Functional Consequences of a Treatment Using Metrenperone During an Outbreak of Shipping Fever in Cattle
Genicot, Bruno; Mouligneau, Frédéric; Rollin, Frédéric ULg et al

in Veterinary Record : Journal of the British Veterinary Association (1993), 132(10), 245-247

Eighteen of 91 seven- to nine-month-old Belgian white and blue double-muscled male fattening cattle developed typical signs of shipping fever. They were all injected intramuscularly once a day for three ... [more ▼]

Eighteen of 91 seven- to nine-month-old Belgian white and blue double-muscled male fattening cattle developed typical signs of shipping fever. They were all injected intramuscularly once a day for three days with 5 mg/kg of enrofloxacin, and in addition nine selected at random were injected intramuscularly five times at 12 hour intervals with 0.1 mg/kg of metrenperone, a 5-hydroxytryptamine blocker, the other nine receiving a placebo. During the outbreak of shipping fever metrenperone showed effective antipyretic properties, and all the calves treated with it made a complete recovery. Moreover, during the 360 day fattening period following the outbreak, the cattle treated with metrenperone gained on average 45.4 kg more weight than the control cattle. [less ▲]

Detailed reference viewed: 19 (2 ULg)
Full Text
Peer Reviewed
See detailThe economic, social and ecologic impact of the tourism in the Vatra Dornei area
Petrescu, Iustinian; Burny, Philippe ULg

in Bran, Florina; Radulescu, Carmen Valentina; Ioan, Ildiko (Eds.) et al International Conference "Ecological Performance in a Competitive Economy", Bucharest 20-21 November 2008 : proceedings, volume II (2008)

The tourism can hold a decisional role in the development of an area that does not have access to remarkable economic resources and has the capacity to contribute decisively to the exploitation of ... [more ▼]

The tourism can hold a decisional role in the development of an area that does not have access to remarkable economic resources and has the capacity to contribute decisively to the exploitation of specific natural and antropic resources (mineral water, sediment, proper areals for sport or recreative activities, etc.) wich atract the touristic fluxes and lead to the apparition and development of the locality as a trousitic resort. In this context, the work aims to highlight the contribution and impact of the touristic activities to the socio-économic development of the Vatrea Dornei area [less ▲]

Detailed reference viewed: 38 (0 ULg)
See detailEconomical analysis of the transport system and multimodal movements and rational choice of mode.
Marchal, Jean ULg

Book published by Edition Transurb-Elmar Hertzo-CEE (1992)

Detailed reference viewed: 4 (1 ULg)
See detailEconomical aspects of agriculture in Belgium
Burny, Philippe ULg

Conference (1989)

Detailed reference viewed: 7 (4 ULg)
See detailEconomical aspects of agriculture in Belgium
Burny, Philippe ULg

Speech (1994)

Detailed reference viewed: 2 (0 ULg)
See detailEconomical aspects of agriculture in Belgium
Burny, Philippe ULg

Conference (1989)

Detailed reference viewed: 2 (1 ULg)
See detailEconomical aspects of agriculture in Wallonia
Burny, Philippe ULg

Speech (2000)

Detailed reference viewed: 2 (0 ULg)
See detailEconomical aspects of agriculture in Wallonia
Burny, Philippe ULg

Speech (2000)

Detailed reference viewed: 1 (0 ULg)
See detailEconomical aspects of Belgian Agriculture
Burny, Philippe ULg

Speech (2010)

Detailed reference viewed: 13 (0 ULg)
Peer Reviewed
See detailEconomical design of joints between welded slender profiles according to Eurocode 3
Braham, M.; Cerfontaine, F.; Jaspart, Jean-Pierre ULg

in Proceedings of the International Workshop on Trends and Developments in Buildings (1998)

Detailed reference viewed: 9 (0 ULg)
Full Text
Peer Reviewed
See detailECONOMICALLY DESIGNED HOTELLING’S T2 CONTROL CHART USING VSICL SCHEME
torabian, Mohsen; Moghadam, M. B.; Faraz, Alireza ULg

in Arabian Journal for Science & Engineering (2010), 35(2), 251263

The Hotelling’s T2 control chart, is the most widely used multivariate procedure for two or more related quality characteristics, but it’s power lacks the desired performance in detecting small to ... [more ▼]

The Hotelling’s T2 control chart, is the most widely used multivariate procedure for two or more related quality characteristics, but it’s power lacks the desired performance in detecting small to moderate shifts. Recently, the variable sampling intervals (VSI) control scheme in which the length of successive sampling intervals is determined upon the preceding T2 values has been proved to have a very good performance on detecting small to moderate shifts when it is compared to the original T2 control chart . Moreover, it has been shown that the VSI scheme is more economical than the classical one. This paper studies the economic consequences of a new control scheme named variable sampling intervals and control limits (VSICL) in that the sampling interval h and control limit k vary between minimum and maximum values while keeping the sample size fixed over time. We apply the cost model proposed by Costa and Rahim [8]. Furthermore, we assume that the length of time that the process remains in control is exponentially distributed which allows us to apply the Markov chain approach for developing the cost model. We apply genetic algorithm to determine the optimal values of model parameters by minimizing the cost function. Finally, both VSI and VSICL T2 control charts are compared with respect to the expected cost per unit time. [less ▲]

Detailed reference viewed: 101 (6 ULg)
Full Text
Peer Reviewed
See detailEconomics in osteoporosis : how can we reconciliate the prescribers and the payer ?
Reginster, Jean-Yves ULg; Hiligsmann, Mickaël ULg

in Osteoporosis International (2012), 23(6), 655-661

Detailed reference viewed: 20 (1 ULg)
Full Text
Peer Reviewed
See detailThe economics of long-term care: A survey
Pestieau, Pierre ULg; Cremer, Helmuth; Ponthiere, Gregory

in Nordic Economic Policy Review (2012), (2), 108-148

Detailed reference viewed: 36 (0 ULg)
Full Text
See detailThe Economics of Parallel Trade – Econ-oclast Views on a Dogma of EU Competition Law
Petit, Nicolas ULg

in Govaere, Inge; Quick, R.; Bronckers, Mario (Eds.) Trade and Competition Law in The EU and Beyond, Edward Elgar Publishing (2011)

Detailed reference viewed: 25 (0 ULg)