scholarly journals THE IMPACT OF THE SOLAR WALL ON THE EXTERNAL ENVELOPE / SAULĖS SIENOS ĮTAKOS PASTATO ATITVAROMS ANALIZĖ

2014 ◽  
Vol 6 (4) ◽  
pp. 438-443
Author(s):  
Violeta Motuzienė
Keyword(s):  
Experimental Data ◽  
Solar Collector ◽  
Negative Influence ◽  
Positive Influence ◽  
Heat Losses ◽  
Comsol Multiphysics ◽  
Heating Season ◽  
The One ◽  
Solar Wall ◽  
The Impact

The paper analyses the influence of the solar wall (unglazed transpired solar collector) on the external envelope during heating and non-heating seasons. Experiments were performed in two rooms – the one with a solar wall and without it. Based on experimental data, the analysis of the influence of the solar wall on the external envelope was done for two cases: employing air by-pass and refusing it. Also, the numerical simulation of the solar wall employing “COMSOL Multiphysics” software was performed. 8 different alternatives were simulated thus seeking to define the ways to decrease a negative and increase a positive influence of the solar wall on the external envelope of the building both in heating and non-heating seasons. The obtained results have shown that the solar wall makes a negative influence on the envelope during the non-heating season if air by-pass is not used. Heat gains increase by 8–12.2%, compared to the case without the solar wall. It has been also defined that the solar wall protects the envelope from heat gains if air by-pass is applied. During the heating season, the solar wall may decrease heat losses by 25.5%, compared to the case without the wall. Straipsnyje nagrinėjama saulės sienos (neįstiklinto pratakaus saulės kolektoriaus) įtaka išorinei atitvarai šiltuoju ir šaltuoju metų laiku. Eksperimentinis tyrimas buvo atliktas dviejose patalpose: vienoje – išorinė atitvara dengta, o kitoje – nedengta saulės siena. Remiantis gautais eksperimentiniais ir meteorologiniais duomenimis atlikta saulės sienos poveikio atitvarai ir jos priklausomybės nuo saulės spinduliuotės intensyvumo su oro apeiga ir be jos analizė. Saulės siena modeliuota su „COMSOL Multiphysics“ programa. Sumodeliuoti aštuoni skirtingi atitvaros su saulės siena variantai, siekiant nustatyti būdus, kaip sumažinti neigiamą ir padidinti teigiamą įtaką atitvarai šiltuoju ir šaltuoju metų laiku. Nustatyta, kad saulės siena šiltuoju metų laiku, kai oras joje nejuda, daro neigiamą įtaką atitvarai – šilumos pritėkiai padidėja 8–12,2 %, lyginant su nedengta atitvara. Analizė parodė, kad saulės siena apsaugo atitvarą nuo tiesioginės saulės spinduliuotės, jei oras ištraukiamas per apėjimo ortakį. Šaltuoju metų laiku saulės siena šilumos nuostolius sumažina 25,5 %, lyginant su nedengta išorine atitvara.

scholarly journals A New Model Approach for Convective Wall Heat Losses in DQMOM-IEM Simulations for Turbulent Reactive Flows

2018 ◽  
Vol 141 (5) ◽  
Author(s):  
Yeshaswini Emmi ◽  
Andreas Fiolitakis ◽  
Manfred Aigner ◽  
Franklin Genin ◽  
Khawar Syed
Keyword(s):  
Experimental Data ◽  
Heat Losses ◽  
Reacting Flow ◽  
Jet Flame ◽  
New Model ◽  
Turbulent Reactive Flows ◽  
Novel Method ◽  
The One ◽  
The Impact ◽  
Model Approach

A new model approach is presented in this work for including convective wall heat losses in the direct quadrature method of moments (DQMoM) approach, which is used here to solve the transport equation of the one-point, one-time joint thermochemical probability density function (PDF). This is of particular interest in the context of designing industrial combustors, where wall heat losses play a crucial role. In the present work, the novel method is derived for the first time and validated against experimental data for the thermal entrance region of a pipe. The impact of varying model-specific boundary conditions is analyzed. It is then used to simulate the turbulent reacting flow of a confined methane jet flame. The simulations are carried out using the DLR in-house computational fluid dynamics code THETA. It is found that the DQMoM approach presented here agrees well with the experimental data and ratifies the use of the new convective wall heat losses model.

scholarly journals A New Model Approach for Convective Wall Heat Losses in DQMoM-IEM Simulations for Turbulent Reactive Flows

2018 ◽  
Author(s):  
Yeshaswini Emmi ◽  
Andreas Fiolitakis ◽  
Manfred Aigner ◽  
Franklin Genin ◽  
Khawar Syed
Keyword(s):  
Experimental Data ◽  
Heat Losses ◽  
Reacting Flow ◽  
Jet Flame ◽  
New Model ◽  
Turbulent Reactive Flows ◽  
Novel Method ◽  
The One ◽  
The Impact ◽  
Model Approach

A new model approach is presented in this work for including convective wall heat losses in the Direct Quadrature Method of Moments (DQMoM) approach, which is used here to solve the transport equation of the one-point, one-time joint thermochemical probability density function (PDF). This is of particular interest in the context of designing industrial combustors, where wall heat losses play a crucial role. In the present work, the novel method is derived for the first time and validated against experimental data for the thermal entrance region of a pipe. The impact of varying model-specific boundary conditions is analysed. It is then used to simulate the turbulent reacting flow of a confined methane jet flame. The simulations are carried out using the DLR in-house Computational Fluid Dynamics (CFD) code THETA. It is found that the DQMoM approach presented here agrees well with the experimental data and ratifies the use of the new convective wall heat losses model.

scholarly journals TO EXAMINE LEADER-MEMBER EXCHANGE AS MODERATING VARIABLE ON THE INFLUENCE OF EMPLOYEE PSYCHOLOGICAL UNCERTAINTY TOWARD EMPLOYEES’ JOB SATISFACTION AND TURNOVER INTENTION

2019 ◽  
Vol 1 (1) ◽  
Author(s):  
Muhammad Zakiy
Keyword(s):  
Job Satisfaction ◽  
Organizational Change ◽  
Turnover Intention ◽  
Negative Influence ◽  
Positive Influence ◽  
Leader Member Exchange ◽  
Member Exchange ◽  
Relationship Of ◽  
The Impact

The studies revealed that organizational change could create employee’s psychological uncertainty. However, this study argues that the quality of leader-member exchange enables to control the impact of the psychological uncertainty during the change toward employee’s attitude. This study represents job satisfaction and turnover intention as proxy of employee’s attitude for that matter. Based on social exchange theory, quality relationship of leader and employees affects on the relationship of psychological uncertainty and employee’s job satisfaction and turnover intention. This study selected private hospitals experiencing the changes of operational system for complying with national health security system. This study conducted cross-section survey for individual level-analysis. This study produces some findings. Firstly, the LMX has been failed to reduce the negative influence of psychological uncertainty towards employee’s job satisfaction, although the quality of the LMX was good. employee’s job satisfaction is more perceived as  personal afective state experienced during the organizational change. Secondly, the LMX has been successfully moderated the positive influence of the psychological uncertainty towards employee’s turnover intention.The data were collected by using questioners, distributed to the employees who worked in hospitals in Yogyakarta Province. There were 193 questioners that could be collected and analyzed by using Moderated Regression Analysis (MRA) to test the hypothesis by using SPSS application version 21. The result of the study shows that psychological uncertainty had negative correlation to employee’s job satisfaction and positive influence to psychological uncertainty toward turnover intention. Besides, LMX was proven to moderate positive influence of psychological uncertainty toward turnover intention, but it could not moderate negative influence of psychological uncertainty toward job satisfaction. 

How does mobile social media affect knowledge sharing under the “Guanxi” system?

2020 ◽  
Vol 24 (6) ◽  
pp. 1343-1367 ◽  
Author(s):  
Xi Zhang ◽  
Jiaxin Tang ◽  
Xin Wei ◽  
Minghui Yi ◽  
Patricia Ordóñez
Keyword(s):  
Social Media ◽  
Knowledge Sharing ◽  
New Product Development ◽  
Negative Impact ◽  
Negative Influence ◽  
Content Type ◽  
Close Cooperation ◽  
The One ◽  
Explicit And Implicit Knowledge ◽  
The Impact

Purpose The purpose of this paper is to explore the impact of mobile social media functions on explicit and implicit knowledge sharing under the “Guanxi” system based on the framework of stimulus–organism–response (SOR). Design/methodology/approach Combined with Guanxi theory, this paper designs an experiment to collect data from the new product development (NPD) teams. Findings Interestingly, the results show that the effect of social media communication function on employees is greater than the impact of collaboration on employees. Specifically, on the one hand, the more employees communicate in social media, the better their feelings will be, the less they will share knowledge. On the other hand, the collaboration function has a significantly negative impact on the psychological factors of employees. Excessively close cooperation and contact may instead create a contradiction between the employees, which is not conducive to the occurrence of knowledge sharing. Originality/value This paper extends SOR framework by combining Guanxi theory to examine the relationship between social media functions and knowledge sharing behavior (KSB). In practical, companies should pay attention to the frequency of employee using social media when it is introduced for NPD teams to control the negative influence of social media functions on employee KSB.

scholarly journals The impact of adopting the euro on the Croatian economy

Notitia ◽  
2019 ◽  
Vol 5 (1) ◽  
pp. 73-89
Author(s):  
Zlatko Čehulić ◽  
Rajka Hrbić
Keyword(s):  
Positive Influence ◽  
European Countries ◽  
Economic Indicators ◽  
The Past ◽  
The Future ◽  
Term Basis ◽  
The One ◽  
The Impact

In this paper the impact of adopting the euro in Croatia is analysed using experiences of other countries which have passed through this process in the last decade and which are comparable with Croatia in many aspects. The process of adopting a currency different from the one that has been used for more than twenty years presents a very important economic question for each country. In this period preceding to adopting the euro, there is an opportunity to analyse this process in the countries which went through it in the past. The result of this paper shows the impacts of adopting the euro in the European countries. The selected countries, which are adequate for analysing the effects of adopting the euro, are: Portugal, Ireland, Greece, Spain, Slovenia, Slovakia, Estonia, Lithuania and Latvia. These countries have been selected for different reasons. The majority of these countries have some similarities with Croatia, which are shown in this paper via relevant economic indicators. These results are significant for Croatia and show a positive influence on the Croatian market on a long-term basis. This paper is relevant and has a practical basis both for Croatia and other countries which will go through this process in the future.

Study of Temperature Field in PECM Based on Multi-Physics Coupling Simulation about Titanium Alloys Blades

2016 ◽  
Vol 723 ◽  
pp. 8-14
Author(s):  
Yuan Long Chen ◽  
Pei Di ◽  
Ming Fang ◽  
Wei Jie Chang
Keyword(s):  
Single Pulse ◽  
Coupling Model ◽  
Negative Influence ◽  
Inlet Pressure ◽  
Comsol Multiphysics ◽  
Duty Ratio ◽  
Electrode Gap ◽  
Processing Zone ◽  
The Impact ◽  
Lower Voltage

In order to study the temperature regularity of inter-electrode gap in PECM, the multi-physical coupling model based on COMSOL Multiphysics platform is established. The model of blades was used for this study, and the impact of some factors on the temperature is analyzed. The results show that the duty ratio is smaller or the inlet pressure is greater, the process of electrolyte convective and heat transfer is more sufficient. At the same time, the increase of the voltage and the decrease of the gaps will exacerbate the temperature fluctuations in a single pulse time. The lower voltage and duty ratio with larger inlet pressure should be selected in small gaps of PECM, so that we can effectively avoid the negative influence of high temperature in the processing zone.

Employees' Psychological Ownership and Self-Efficacy as Mediators Between Performance Appraisal Purpose and Proactive Behavior

2015 ◽  
Vol 43 (7) ◽  
pp. 1101-1109 ◽  
Author(s):  
Min Qiu ◽  
Bei Hu ◽  
Zhang Xu ◽  
Yucai Li
Keyword(s):  
Performance Appraisal ◽  
Self Efficacy ◽  
Management Practice ◽  
Negative Influence ◽  
Positive Influence ◽  
Psychological Ownership ◽  
Proactive Behavior ◽  
Intermediary Role ◽  
The Impact ◽  
Positive Effect

We analyzed the impact of performance appraisal purpose on employees' proactive behavior, and explored the roles of psychological ownership and self-efficacy as mediators in this relationship. We conducted a survey with 512 employees of enterprises in 4 cities in China. The results of analysis of the data collected showed that an evaluative performance appraisal had a negative influence on the employees' proactive behavior whereas a developmental performance appraisal had a positive influence. Psychological ownership and self-efficacy were found to have an intermediary role between performance appraisal purpose and the employees' proactive behavior. Self-efficacy had a significant positive effect on psychological ownership. Implications of these results for theory and management practice are discussed.

scholarly journals Effect of Money Supply on Economic Growth: A Comparative Study of Nigeria and Ghana

2019 ◽  
Vol 7 (3) ◽  
pp. 16
Author(s):  
Cordelia Onyinyechi Omodero
Keyword(s):  
Economic Growth ◽  
Money Supply ◽  
Negative Impact ◽  
Ordinary Least Squares ◽  
Negative Influence ◽  
Positive Influence ◽  
Least Squares Regression ◽  
Monetary Authorities ◽  
Significant Negative Impact ◽  
The Impact

The effect of money supply in enhancing economic growth in Nigeria and Ghana is investigated in this study. The major objectives of the study are to establish the joint and individual influences of money supply mechanisms on economic growth in Nigeria and Ghana. The study employs data from 2009 to 2018 and uses Ordinary Least Squares regression technique for analysis of the data. The findings reveal that broad money supply (M2) has an insignificant negative influence on RGDP in Nigeria, but in Ghana the impact is significant and positive. Broad money supply (M3) exerts insignificant positive influence on RGDP in Nigeria, but significant negative impact on RGDP in Ghana while credit to private sectors (CPS) has insignificant positive influence on RGDP in both Nigeria and Ghana. The study among others suggests that the Monetary Authorities in the two countries should come up with monetary policy strategies that will help drive the economy better and such policies should consider M2 and CPS more as their contributions are necessary for economic expansion that lead to more output and employment.

scholarly journals The Impact of Governance Rules on Earnings Management: Applied Study on Industrial and Service Companies Listed on Palestine Stock Exchange

2019 ◽  
pp. 103-136
Author(s):  
Yousef Alrayyes ◽  
Nahed Al Khaldy
Keyword(s):  
Corporate Governance ◽  
Earnings Management ◽  
Stock Exchange ◽  
Negative Influence ◽  
Positive Influence ◽  
Board Independence ◽  
Independence Property ◽  
Ceo Duality ◽  
Board Directors ◽  
The Impact

The aim of the study is to analyze the impact of corporate governance rules on earnings management for companies listed on Palestine Exchange. A number of corporate governance variables was selected to achieve this aim, including size of board of directors, CEO duality, board of director’s independence, property rights, number of board directors’ meetings. Modified Jones Model has been used to detect earnings management. Panel Data Model has also been involved in the study, where the population study consists of the 48 companies listed on Palestine Exchange, and which are distributed across five main sectors. The study sample included 13 industrial and services companies listed on Palestine Exchange. This study found that there was a negative influence between board size and CEO duality, and between earnings management. The study also showed that there is a positive influence between board independence and earnings management. Moreover, it showed that no relationship between board directors meetings and internal ownership with earnings management. The study stressed on the need for continued reinforcement of the governance rules, in order to avoid the negative impacts resulted from failure to apply these rules, taking into consideration the support of board independence in their relationship with areas of executive work to avoid taking decision that may affect earnings management. It also recommended that doing other researches on the same subject should be continued, taking into account the examination of variables other than those in this study to get to the variables that have the greatest impact on earnings management for companies listed on Palestine Exchange. 

scholarly journals Assessment of the impact of factors upon tourism revenue in Jordan

2020 ◽  
pp. 117-128
Author(s):  
Moayyad Shakra ◽  
Yuriy Davydovich Shmidt
Keyword(s):  
Price Index ◽  
Foreign Currency ◽  
Consumer Price Index ◽  
Negative Influence ◽  
Positive Influence ◽  
Distributed Lag ◽  
Distributed Lag Model ◽  
Wide Range ◽  
The Impact ◽  
Tourism Revenue

This article examines Jordan’s tourism revenue over the recent years. Tourism is a substantial source of national revenue and significantly contributes to the flow of foreign currency for the development of national economy. The economic theory claims that tourism revenue is affected by a wide range of factors. The article explores the impact of consumer price index and number of tourists upon Jordan’s tourism revenue. In the course of this study, the author used the statistical data of the World Bank and International Monetary Fund; applied Autoregressive Distributed Lag model (ARDL); and conducted necessary diagnostic tests in Eviews 9 software. The research demonstrated that high internal inflation ratios reduce the external demand for tourism services in Jordan, and thus significantly decrease the tourism revenue. Over a long-term, the author determines a negative influence of consumer price index upon tourism revenue in Jordan and the expected positive influence of the number of tourists thereof.  

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