24 research outputs found

    NEPHROPROTECTIVE AND DIURETIC EFFECT OF NIGELLA SATIVA L SEEDS OIL ON LITHIASIC WISTAR RATS

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    Background and objective: The purpose of the current investigation was to study the influences, preventive and diuretic, of Nigella sativa L. seeds oil (NSSO) on calcium oxalate (CaOx) urolithiasis induced in Wistar male rats. Methodology: Seeds of Nigella sativa L. (N.S) were analysed for the evaluation of the concentration of oxalate and calcium. Nigella sativa L. seeds oil is obtained by hydrodistillation and HPTLC densitometric method was adopted to determine the amount of thymoquinone (TQ) present. Thirty male Wistar rats were divided into 5 groups (N=6). Group I, negative control, drank tap water. The other groups were II Positive control, III, IV and V received a treatment model inducing calcium oxalate urolithiasis for 28 days, using an aqueous solution involve 0.75% (EG) ethylene glycol and 1.0 % (AC) chloride ammonium. Rats in group III received in addition, 750 mg/kg Cystone from the beginning to the end of calculi induction experimentation. However, rats in Groups IV and V received (NSSO) at 5 ml/kg b.w by gavage on days 1st to 28th and 15th to 28th days, respectively. On days 0, 7, 14, 21 and 28, body weights were measured and the 24-hour urine samples were accumulated and analysed for biochemical elements. On the 28th day, blood samples were collected for the estimation of serum parameters including creatinine, BUN and uric acid. All animals were sacrificed at the end of the experiment and the kidneys were detached for histopathological examination. Results: Administration of (NSSO) at 5 ml/kg body weight/dose/day for 28 days exerts a protective effect by reducing significantly (

    The Mediating Effect of Organizational Climate on the Relationship between Transformational Leadership and Patient Safety: A Study on Saudi Hospitals

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    the main aim of this paper is to investigate the mediation effect of organizational climate on the relationship between Transformational Leadership and perceived patient safety in Saudi Hospitals from the nurses perspective. Patient safety has become a significant topic among health professionals, policy makers, and the public owing to the emphasis on the reported and unreported healthcare errors that result in negative situations. A quantitative research design was employed to collect data from nurses in Saudi hospitals to examine the hypothesized model. Out of 254 questionnaires distributed only 217 questionnaires were usable for analysis. The Partial Least Squares Structural Equation Modeling (PLS-SEM) method was used to test the hypotheses. Based on the statistical results, this study supported the relationship between Transformational Leadership and organizational climate and the relationship between organizational climate and perception of patient safety. Finally, this study confirmed the full mediating effect of organizational climate on the relationship between Transformational Leadership and perception of patient safety. The findings of the study are of a great value to both theory and practice and have important implications for practitioners and policy-makers. DOI: 10.5901/mjss.2015.v6n2s1p11

    Design of RF circuits on Benzocyclobutene polymer (BCB) for millimeter wave and THz applications

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    Les nouvelles applications dans la gamme de frĂ©quences submillimĂ©triques, imposent un dĂ©veloppement rapide du trafic et nĂ©cessitent une augmentation importante de la capacitĂ© de transmission, que ça soit en tĂ©lĂ©communications, en imagerie ou en spectroscopie. Aujourd’hui, cette augmentation de capacitĂ© de transmission est obtenue, soit par une amĂ©lioration de l’efficacitĂ© spectrale, soit par l’élargissement du spectre utilisĂ©, ce qui nĂ©cessite l’utilisation des gammes de frĂ©quences au-delĂ  de 300 GHz. Depuis quelques annĂ©es, ces nouvelles applications, impliquant des hauts dĂ©bits, ont suscitĂ©s l’intĂ©rĂȘt et l’effort de plusieurs Ă©quipes de recherche qui ont effectuĂ©s des Ă©tudes plus axĂ©es sur des dispositifs actifs que des dispositifs passifs. Tandis que les dispositifs passifs Ă  base de polymĂšre, sont particuliĂšrement intĂ©ressants et pertinents en raison de leurs excellentes performances intrinsĂšques, et de leur aptitude Ă  pouvoir s’adapter et Ă  s’intĂ©grer aux diffĂ©rentes technologies microĂ©lectroniques existantes telles que MOS Si, BiCMOS SiGe, MMIC GaAs, GaN ou InP. Dans le cadre de cette thĂšse, l’étude menĂ©e a portĂ© sur la conception et la rĂ©alisation de circuits passifs dans la gamme de frĂ©quences allant du millimĂ©trique au THz sur le polymĂšre Benzocyclobutene (BCB). Pour cela des antennes de topologies innovantes et des guides d’ondes mĂ©talliques monomodes Ă  faibles pertes et Ă  trĂšs fort facteur de qualitĂ© ont Ă©tĂ© simulĂ©es, rĂ©alisĂ©es et caractĂ©risĂ©es. Le choix du polymĂšre BCB rĂ©side dans le fait qu’il prĂ©sente de faibles valeurs de pertes, notamment aux frĂ©quences THz, permettant ainsi d’amĂ©liorer le rendement des circuits passifs Ă  ces frĂ©quences. L’autre atout de ce polymĂšre, rĂ©side dans la facilitĂ© Ă  le dĂ©poser (par centrifugation) au-dessus de tout type de substrat et/ou de circuits intĂ©grĂ©s. Cela permet de rĂ©aliser sur un mĂȘme dispositif des systĂšmes incluant des circuits actifs et passifs tout en rĂ©duisant les interconnexions. Dans le but de valider le concept, plusieurs dispositifs ont Ă©tĂ© rĂ©alisĂ©s et caractĂ©risĂ©s aux moyens technologiques de la CTU du C2N (du rĂ©seau Renatech). Dans un premier temps, des guides d’ondes GCPW avec vias ont Ă©tĂ© rĂ©alisĂ©s et mesurĂ©s sur BCB et les rĂ©sultats obtenus sont en bon accord avec les simulations jusqu’à 760 GHz (proche THz). Ils demeurent monomode Ă  faible pertes et prĂ©sentent une attĂ©nuation trĂšs satisfaisante aussi faible que 3 dB/mm Ă  600 GHz avec une permittivitĂ© effective d'environ 1.95. Dans un deuxiĂšme temps, dans le but d’étudier l’association de circuits actifs et passifs sur BCB, il a Ă©tĂ© proposĂ© de rĂ©aliser une rectenna fonctionnant autour de 60 GHz (visant des applications WiGig). Pour cela, diffĂ©rentes topologies d’antennes planaires ont Ă©tĂ© simulĂ©es, rĂ©alisĂ©es et caractĂ©risĂ©es au C2N. Le circuit de la rectenna a ensuite Ă©tĂ© optimisĂ© sous ADS en testant diffĂ©rentes diodes Schottky commerciales. Ces technologies de dispositifs passifs sur polymĂšre BCB, ouvrent la voie Ă  de nombreuses perspectives telles que, l’interconnexion entre guides et antennes de diffĂ©rente nature, le couplage des circuits passifs avec des dispositifs actifs sur semi-conducteur (des amplificateurs distribuĂ©s ou des multiplieurs), ainsi que la rĂ©alisation des motifs de calibrage et d’épluchage avec des guides monomodes sur polymĂšre au-delĂ  de 110 GHz, en concurrence avec ceux dĂ©jĂ  commercialisĂ©s sur substrat alumine, et dont les limites sont largement atteintes.New applications in the submillimeter frequency range require rapid development of traffic and require a significant increase in transmission capacity, whether in telecommunications, imaging or spectroscopy. Today, this increase in transmission capacity is achieved either by improving spectral efficiency or by broadening the spectrum used, necessitating the use of frequency ranges above 300 GHz. In recent years, these new applications, involving high data rates, have aroused the interest and effort of many research teams who have carried out studies focusing more on active devices than on passive devices. The subject of this thesis concerns passive circuits for the millimeter and the THz. For the realization of integrated passive functions and circuits, polymers appear particularly interesting and relevant because of their excellent intrinsic performance, and their ability to be able to adapt and integrate into the various existing microelectronic technologies such as MOS Si, BiCMOS, SiGe, MMIC GaAs, GaN or InP. As part of this thesis, the study carried out focused on the design and realization of passive circuits in the frequency range from millimeter to THz on the Benzocyclobutene (BCB) polymer. For this, antennas with innovative topologies and single-mode low-loss metal waveguides with a very high quality factor were simulated, produced and characterized. The BCB polymer was chosen because it exhibits low losses at THz frequencies and a low real part of the permittivity which reduces radiation losses, thus improving the efficiency of passive circuits at these frequencies. The other advantage of this polymer lies in the ease of depositing it (by centrifugation) on top of any type of substrate and / or integrated circuits. This allow to produce systems including active and passive circuits on the same device while reducing interconnections. In order to validate the concept, several devices are realized and characterized using the technological means of the CTU of C2N (of the Renatech network). First, GCPW waveguides (with vias) on BCB were realized and were first measured at C2N up to 67 GHz. The results obtained are in good agreement with simulations results. Then a few guides were measured at the IEMN up to 760 GHz. These guides remain single-mode and exhibit low losses (3 dB / mm at 600 GHz with an effective permittivity of approximately 1.95).Secondly, in order to study the association of active and passive circuits on BCB, it is proposed to create a rectenna operating around 60 GHz (targeting Wi-Gig applications). To this end, various topologies of planar antennas were simulated, realized and characterized at C2N. The rectenna circuit was then optimized under the Advanced Design System (ADS) software based on different models of commercial Schottky diodes. Finally, in order to maximize the efficiency of the rectenna, an optimization study of a Schottky diode in GaAs technology is proposed. The work undertaken made it possible to acquire and consolidate the stages of modeling, design and realization of integrated technologies on BCB polymer. They open the way to many future perspectives such as the association of passive circuits and active components based on semiconductors which will be directly integrated on a single chip. This technology will thus make it possible to considerably reduce the losses due to the interconnections between components and therefore to design highly integrated systems operating in the THz range

    Conception de circuits RF sur polymÚre BenzocyclobutÚne (BCB) pour des applications à ondes millimétriques et THz

    No full text
    New applications in the submillimeter frequency range require rapid development of traffic and require a significant increase in transmission capacity, whether in telecommunications, imaging or spectroscopy. Today, this increase in transmission capacity is achieved either by improving spectral efficiency or by broadening the spectrum used, necessitating the use of frequency ranges above 300 GHz. In recent years, these new applications, involving high data rates, have aroused the interest and effort of many research teams who have carried out studies focusing more on active devices than on passive devices. The subject of this thesis concerns passive circuits for the millimeter and the THz. For the realization of integrated passive functions and circuits, polymers appear particularly interesting and relevant because of their excellent intrinsic performance, and their ability to be able to adapt and integrate into the various existing microelectronic technologies such as MOS Si, BiCMOS, SiGe, MMIC GaAs, GaN or InP. As part of this thesis, the study carried out focused on the design and realization of passive circuits in the frequency range from millimeter to THz on the Benzocyclobutene (BCB) polymer. For this, antennas with innovative topologies and single-mode low-loss metal waveguides with a very high quality factor were simulated, produced and characterized. The BCB polymer was chosen because it exhibits low losses at THz frequencies and a low real part of the permittivity which reduces radiation losses, thus improving the efficiency of passive circuits at these frequencies. The other advantage of this polymer lies in the ease of depositing it (by centrifugation) on top of any type of substrate and / or integrated circuits. This allow to produce systems including active and passive circuits on the same device while reducing interconnections. In order to validate the concept, several devices are realized and characterized using the technological means of the CTU of C2N (of the Renatech network). First, GCPW waveguides (with vias) on BCB were realized and were first measured at C2N up to 67 GHz. The results obtained are in good agreement with simulations results. Then a few guides were measured at the IEMN up to 760 GHz. These guides remain single-mode and exhibit low losses (3 dB / mm at 600 GHz with an effective permittivity of approximately 1.95).Secondly, in order to study the association of active and passive circuits on BCB, it is proposed to create a rectenna operating around 60 GHz (targeting Wi-Gig applications). To this end, various topologies of planar antennas were simulated, realized and characterized at C2N. The rectenna circuit was then optimized under the Advanced Design System (ADS) software based on different models of commercial Schottky diodes. Finally, in order to maximize the efficiency of the rectenna, an optimization study of a Schottky diode in GaAs technology is proposed. The work undertaken made it possible to acquire and consolidate the stages of modeling, design and realization of integrated technologies on BCB polymer. They open the way to many future perspectives such as the association of passive circuits and active components based on semiconductors which will be directly integrated on a single chip. This technology will thus make it possible to considerably reduce the losses due to the interconnections between components and therefore to design highly integrated systems operating in the THz range.Les nouvelles applications dans la gamme de frĂ©quences submillimĂ©triques, imposent un dĂ©veloppement rapide du trafic et nĂ©cessitent une augmentation importante de la capacitĂ© de transmission, que ça soit en tĂ©lĂ©communications, en imagerie ou en spectroscopie. Aujourd’hui, cette augmentation de capacitĂ© de transmission est obtenue, soit par une amĂ©lioration de l’efficacitĂ© spectrale, soit par l’élargissement du spectre utilisĂ©, ce qui nĂ©cessite l’utilisation des gammes de frĂ©quences au-delĂ  de 300 GHz. Depuis quelques annĂ©es, ces nouvelles applications, impliquant des hauts dĂ©bits, ont suscitĂ©s l’intĂ©rĂȘt et l’effort de plusieurs Ă©quipes de recherche qui ont effectuĂ©s des Ă©tudes plus axĂ©es sur des dispositifs actifs que des dispositifs passifs. Tandis que les dispositifs passifs Ă  base de polymĂšre, sont particuliĂšrement intĂ©ressants et pertinents en raison de leurs excellentes performances intrinsĂšques, et de leur aptitude Ă  pouvoir s’adapter et Ă  s’intĂ©grer aux diffĂ©rentes technologies microĂ©lectroniques existantes telles que MOS Si, BiCMOS SiGe, MMIC GaAs, GaN ou InP. Dans le cadre de cette thĂšse, l’étude menĂ©e a portĂ© sur la conception et la rĂ©alisation de circuits passifs dans la gamme de frĂ©quences allant du millimĂ©trique au THz sur le polymĂšre Benzocyclobutene (BCB). Pour cela des antennes de topologies innovantes et des guides d’ondes mĂ©talliques monomodes Ă  faibles pertes et Ă  trĂšs fort facteur de qualitĂ© ont Ă©tĂ© simulĂ©es, rĂ©alisĂ©es et caractĂ©risĂ©es. Le choix du polymĂšre BCB rĂ©side dans le fait qu’il prĂ©sente de faibles valeurs de pertes, notamment aux frĂ©quences THz, permettant ainsi d’amĂ©liorer le rendement des circuits passifs Ă  ces frĂ©quences. L’autre atout de ce polymĂšre, rĂ©side dans la facilitĂ© Ă  le dĂ©poser (par centrifugation) au-dessus de tout type de substrat et/ou de circuits intĂ©grĂ©s. Cela permet de rĂ©aliser sur un mĂȘme dispositif des systĂšmes incluant des circuits actifs et passifs tout en rĂ©duisant les interconnexions. Dans le but de valider le concept, plusieurs dispositifs ont Ă©tĂ© rĂ©alisĂ©s et caractĂ©risĂ©s aux moyens technologiques de la CTU du C2N (du rĂ©seau Renatech). Dans un premier temps, des guides d’ondes GCPW avec vias ont Ă©tĂ© rĂ©alisĂ©s et mesurĂ©s sur BCB et les rĂ©sultats obtenus sont en bon accord avec les simulations jusqu’à 760 GHz (proche THz). Ils demeurent monomode Ă  faible pertes et prĂ©sentent une attĂ©nuation trĂšs satisfaisante aussi faible que 3 dB/mm Ă  600 GHz avec une permittivitĂ© effective d'environ 1.95. Dans un deuxiĂšme temps, dans le but d’étudier l’association de circuits actifs et passifs sur BCB, il a Ă©tĂ© proposĂ© de rĂ©aliser une rectenna fonctionnant autour de 60 GHz (visant des applications WiGig). Pour cela, diffĂ©rentes topologies d’antennes planaires ont Ă©tĂ© simulĂ©es, rĂ©alisĂ©es et caractĂ©risĂ©es au C2N. Le circuit de la rectenna a ensuite Ă©tĂ© optimisĂ© sous ADS en testant diffĂ©rentes diodes Schottky commerciales. Ces technologies de dispositifs passifs sur polymĂšre BCB, ouvrent la voie Ă  de nombreuses perspectives telles que, l’interconnexion entre guides et antennes de diffĂ©rente nature, le couplage des circuits passifs avec des dispositifs actifs sur semi-conducteur (des amplificateurs distribuĂ©s ou des multiplieurs), ainsi que la rĂ©alisation des motifs de calibrage et d’épluchage avec des guides monomodes sur polymĂšre au-delĂ  de 110 GHz, en concurrence avec ceux dĂ©jĂ  commercialisĂ©s sur substrat alumine, et dont les limites sont largement atteintes

    Conception de circuits RF sur polymÚre BenzocyclobutÚne (BCB) pour des applications à ondes millimétriques et THz

    No full text
    New applications in the submillimeter frequency range require rapid development of traffic and require a significant increase in transmission capacity, whether in telecommunications, imaging or spectroscopy. Today, this increase in transmission capacity is achieved either by improving spectral efficiency or by broadening the spectrum used, necessitating the use of frequency ranges above 300 GHz. In recent years, these new applications, involving high data rates, have aroused the interest and effort of many research teams who have carried out studies focusing more on active devices than on passive devices. The subject of this thesis concerns passive circuits for the millimeter and the THz. For the realization of integrated passive functions and circuits, polymers appear particularly interesting and relevant because of their excellent intrinsic performance, and their ability to be able to adapt and integrate into the various existing microelectronic technologies such as MOS Si, BiCMOS, SiGe, MMIC GaAs, GaN or InP. As part of this thesis, the study carried out focused on the design and realization of passive circuits in the frequency range from millimeter to THz on the Benzocyclobutene (BCB) polymer. For this, antennas with innovative topologies and single-mode low-loss metal waveguides with a very high quality factor were simulated, produced and characterized. The BCB polymer was chosen because it exhibits low losses at THz frequencies and a low real part of the permittivity which reduces radiation losses, thus improving the efficiency of passive circuits at these frequencies. The other advantage of this polymer lies in the ease of depositing it (by centrifugation) on top of any type of substrate and / or integrated circuits. This allow to produce systems including active and passive circuits on the same device while reducing interconnections. In order to validate the concept, several devices are realized and characterized using the technological means of the CTU of C2N (of the Renatech network). First, GCPW waveguides (with vias) on BCB were realized and were first measured at C2N up to 67 GHz. The results obtained are in good agreement with simulations results. Then a few guides were measured at the IEMN up to 760 GHz. These guides remain single-mode and exhibit low losses (3 dB / mm at 600 GHz with an effective permittivity of approximately 1.95).Secondly, in order to study the association of active and passive circuits on BCB, it is proposed to create a rectenna operating around 60 GHz (targeting Wi-Gig applications). To this end, various topologies of planar antennas were simulated, realized and characterized at C2N. The rectenna circuit was then optimized under the Advanced Design System (ADS) software based on different models of commercial Schottky diodes. Finally, in order to maximize the efficiency of the rectenna, an optimization study of a Schottky diode in GaAs technology is proposed. The work undertaken made it possible to acquire and consolidate the stages of modeling, design and realization of integrated technologies on BCB polymer. They open the way to many future perspectives such as the association of passive circuits and active components based on semiconductors which will be directly integrated on a single chip. This technology will thus make it possible to considerably reduce the losses due to the interconnections between components and therefore to design highly integrated systems operating in the THz range.Les nouvelles applications dans la gamme de frĂ©quences submillimĂ©triques, imposent un dĂ©veloppement rapide du trafic et nĂ©cessitent une augmentation importante de la capacitĂ© de transmission, que ça soit en tĂ©lĂ©communications, en imagerie ou en spectroscopie. Aujourd’hui, cette augmentation de capacitĂ© de transmission est obtenue, soit par une amĂ©lioration de l’efficacitĂ© spectrale, soit par l’élargissement du spectre utilisĂ©, ce qui nĂ©cessite l’utilisation des gammes de frĂ©quences au-delĂ  de 300 GHz. Depuis quelques annĂ©es, ces nouvelles applications, impliquant des hauts dĂ©bits, ont suscitĂ©s l’intĂ©rĂȘt et l’effort de plusieurs Ă©quipes de recherche qui ont effectuĂ©s des Ă©tudes plus axĂ©es sur des dispositifs actifs que des dispositifs passifs. Tandis que les dispositifs passifs Ă  base de polymĂšre, sont particuliĂšrement intĂ©ressants et pertinents en raison de leurs excellentes performances intrinsĂšques, et de leur aptitude Ă  pouvoir s’adapter et Ă  s’intĂ©grer aux diffĂ©rentes technologies microĂ©lectroniques existantes telles que MOS Si, BiCMOS SiGe, MMIC GaAs, GaN ou InP. Dans le cadre de cette thĂšse, l’étude menĂ©e a portĂ© sur la conception et la rĂ©alisation de circuits passifs dans la gamme de frĂ©quences allant du millimĂ©trique au THz sur le polymĂšre Benzocyclobutene (BCB). Pour cela des antennes de topologies innovantes et des guides d’ondes mĂ©talliques monomodes Ă  faibles pertes et Ă  trĂšs fort facteur de qualitĂ© ont Ă©tĂ© simulĂ©es, rĂ©alisĂ©es et caractĂ©risĂ©es. Le choix du polymĂšre BCB rĂ©side dans le fait qu’il prĂ©sente de faibles valeurs de pertes, notamment aux frĂ©quences THz, permettant ainsi d’amĂ©liorer le rendement des circuits passifs Ă  ces frĂ©quences. L’autre atout de ce polymĂšre, rĂ©side dans la facilitĂ© Ă  le dĂ©poser (par centrifugation) au-dessus de tout type de substrat et/ou de circuits intĂ©grĂ©s. Cela permet de rĂ©aliser sur un mĂȘme dispositif des systĂšmes incluant des circuits actifs et passifs tout en rĂ©duisant les interconnexions. Dans le but de valider le concept, plusieurs dispositifs ont Ă©tĂ© rĂ©alisĂ©s et caractĂ©risĂ©s aux moyens technologiques de la CTU du C2N (du rĂ©seau Renatech). Dans un premier temps, des guides d’ondes GCPW avec vias ont Ă©tĂ© rĂ©alisĂ©s et mesurĂ©s sur BCB et les rĂ©sultats obtenus sont en bon accord avec les simulations jusqu’à 760 GHz (proche THz). Ils demeurent monomode Ă  faible pertes et prĂ©sentent une attĂ©nuation trĂšs satisfaisante aussi faible que 3 dB/mm Ă  600 GHz avec une permittivitĂ© effective d'environ 1.95. Dans un deuxiĂšme temps, dans le but d’étudier l’association de circuits actifs et passifs sur BCB, il a Ă©tĂ© proposĂ© de rĂ©aliser une rectenna fonctionnant autour de 60 GHz (visant des applications WiGig). Pour cela, diffĂ©rentes topologies d’antennes planaires ont Ă©tĂ© simulĂ©es, rĂ©alisĂ©es et caractĂ©risĂ©es au C2N. Le circuit de la rectenna a ensuite Ă©tĂ© optimisĂ© sous ADS en testant diffĂ©rentes diodes Schottky commerciales. Ces technologies de dispositifs passifs sur polymĂšre BCB, ouvrent la voie Ă  de nombreuses perspectives telles que, l’interconnexion entre guides et antennes de diffĂ©rente nature, le couplage des circuits passifs avec des dispositifs actifs sur semi-conducteur (des amplificateurs distribuĂ©s ou des multiplieurs), ainsi que la rĂ©alisation des motifs de calibrage et d’épluchage avec des guides monomodes sur polymĂšre au-delĂ  de 110 GHz, en concurrence avec ceux dĂ©jĂ  commercialisĂ©s sur substrat alumine, et dont les limites sont largement atteintes

    Electroluminescence AC powder displays based upon ZnS:Tm, Li

    No full text
    The preparation and characterisation of an inorganic blue-emitting alternate-current electrolumenescent (ACEL) cell based upon ZnS:Tm, Li phosphor powder are described. Electroluminescent and photoluminescent spectra clearly show a dominant blue-emission band peaking at 2.6 eV (477 nm) originated from 1G4-->3H6 transition. Advantages and drawbacks of the powder-based ACEL cell have been discussed in comparison with a ACEL thin-film based upon a similar material. The near-infra-red band (801 nm, 1.55 eV, 3F4-->3H6) seen in thin-film structure was significantly suppressed in these types of devices.Luminescence Optical properties Phosphorus X-ray diffraction

    The effect of awareness, knowledge and cost on intention to adopt green building practices

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    Addressing the threats of climate change has become one of the world's major challenges. More than 36 billion tonnes of carbon dioxide emissions have been recorded recently and the construction industry has been identified as one of the culprits in the worsening of climate change phenomena. Previous studies have revealed that conventional construction procedures are having a major impact on the environment. In light of these circumstances, this study examines the relationship among some influential and environmental factors - including awareness of environmental issues, knowledge of green practices, cost of green materials, subjective norms, attitudes, perceived behavioural control and intention to adopt green building practices in Qatar. The data were collected from 378 engineers using a survey method and were analysed using PLS-SEM. The findings confirmed that significant relationships exist among all variables except for the effect of perceived behaviour control on intention to adopt green building practices. This study provides valuable insight that may help decision makers to plan for strategies to increase the adoption of green building practices among construction companies
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