1,736 research outputs found
Circular construction and demolition waste?: Barriers and opportunities for creating circular business models in the EU C&DW sector
No full textThe main goal of this paper is to identify barriers and opportunities for creating the circular business models in the EU C&DW sector. Having in mind this fact, author of the paper describes market, social, governance and regulatory failures which may limit opportunities for achieving market success in the EU C&DW sector. The presentation will take into account current economic situation of the sector which is under the pressure of both global economic challenges and the EU policy aiming at popularization of the circular economy approach. As a result, different recommendations that may determine the final shape of the business models will be identified, including key resources that have to be used for successful commercialization of the different circular C&DW solutions
First photometric study of two southern eclipsing binaries IS Tel and DW Aps
No full text32nd International Physics Congress of Turkish-Physical-Society (TPS) -- SEP 06-09, 2016 -- Bodrum, TURKEYThe paper presents the first photometric analysis of two southern eclipsing binary stars, IS Tel and DW Aps. Their V light curves from the All Sky Automated Survey were modelled by using Wilson-Devinney method. The final models give these two Algol-like binary stars as having detached configurations. Absolute parameters of the components of the systems were also estimated.Turkish Phys So
Policy analysis of water management for the Netherlands. Vol VII: Assessment of impacts on drinking-water companies and their customers
No full textThis volume assesses the impacts of a number of water management policies developed by PAWN on drinking-water (DW) companies and their customers (households, commercial entities, and industrial firms). Chapter 2 summarizes briefly the major water-related problems facing DW companies in the Netherlands today, and shows why the author believes they will become more severe in the future. Chapter 3 describes the methodology in detail. Chapter 4 presents the impacts and associated discussion of PAWN's primary and groundwater cases on DW production, and on DW companies and their customers. Finally, in Chap. 5, the author assesses those impacts, draws some overall conclusions, and discusses the implications of those conclusions for the future supply and costs of DW in the Netherlands.PAW
Randomized clinical trial of carotid angioplasty with distal brain protection filter comparing closed cell stent with Casper stent
No full textObjetivo deste estudo: comparar a eficácia do stent de célula fechada com o stent Casper durante angioplastia de carótida com implante de stent (ACS) e dispositivo de proteção cerebral (DPC) distal. Material e Métodos: estudo prospectivo de superioridade randomizado no qual 88 pacientes foram incluídos. Os desfechos primários foram a incidência, número e tamanho de novas lesões cerebrais isquêmicas após ACS sob DPC distal. Os desfechos secundários incluíram acidente vascular cerebral (AVC), ataque isquêmico transitório (AIT) e infarto agudo do miocárdio (IAM). As lesões cerebrais isquêmicas foram avaliadas por uma imagem de ressonância magnética na sequência de difusão (DWI-MR). Os resultados neurológicos foram avaliados por meio do NIHSS e da escala Rankin modificada (mRS). Resultados: Comparado com o stent de célula fechada (n = 47), o stent Casper (n = 41) não resultou em redução significativa na incidência (44,7% versus 39%, p = 0,592), número (1,3 ± 1,8 versus 0,9 ± 1,5; p = 0,444) e tamanho (3,9 ± 5,8 versus 2,8 ± 4,2 mm; p = 0,353) de novas lesões cerebrais isquêmicas na DWI-MR. A taxa global de AVC / AIT / IAM foi (2/88 - 2,3%). Dois AITs ocorreram no período hospitalar, um em cada grupo (1/41 - 2,4% versus 1/47 - 2,1%). Um paciente do grupo-Casper apresentou trombose intra-stent assintomática. Um paciente do grupo-controle apresentou IAM (1/47 - 2,1%) após a alta. Conclusão: O stent Casper não mostrou superioridade na taxa de incidência, número e tamanho de novas lesões cerebrais isquêmicas silenciosas detectadas por DWI-RM quando comparado ao stent célula fechada durante ACS sob DPC distal.Objective: The aim of this trial was to compare the efficacy of closed-cell stents with Casper stents during carotid angioplasty stenting (CAS). Methods: This was a randomized superiority trial in which 88 patients were enrolled. The primary end points were the incidence, number, and size of new ischemic brain lesions after CAS under distal embolic protection devices (EPD). The secondary end points included stroke, transient ischemic attack (TIA) and myocardial infarction (MI). Ischemic brain lesions were assessed by a diffusion-weighted magnetic resonance image (DWI-MR). Neurological outcomes were evaluated by means of the National Institutes of Health scale score (NIHSS) and the modified Rankin scale (mRS). Results: Compared with closed-cell stents (n= 47), Casper stents (n= 41), resulted in no significant reduction in the incidence (44.7% versus 39%, p = 0.592), number (1.3± 1.8 versus 0.9± 1.5, p = 0.444), and size (3.9± 5.8 mm versus 2.8± 4.1mm, p = 0.353) of new ischemic brain lesions. The global rate of stroke/TIA/MI was (2/88, 2.3%). Two TIA occurred during the hospitalization period, one in each group (1/41, 2.4% versus 1/47, 2.1%). One patient of the Casper group had an asymptomatic in-stent thrombosis. One patient of the control group had a MI (1/47, 2.1%) after discharge. Conclusion: The Casper stents did not show superiority in the rate of incidence, number and size of new silent ischemic brain lesions detect by DW-MRI when compared to close cell stents during CAS under distal EPD
Novel circular economy business model of high-added value products for energy efficiency: from C&DW to aerogels
No full textSince the Industrial Revolution, humanity’s use of natural resources has been basically the same: TAKE, MAKE and THROW AWAY; which consequently led to the indispensable problems of waste materials. Around 461 million tons of Construction & Demolition Waste (C&DW), excluding excavation materials, are yearly generated in EU28. This undoubtedly gives a call to novel closed-loop circular business models which reshape the Eco-system in a way the waste is 'designed out'. Here, we present a novel closed-loop circular economy model of a high-performance building insulation material from silica containing C&DW materials to silica aerogels with λ≈0.015 W/mK. In the present model, the benefit comes with the use of massive construction waste to a silica precursor and thereby aerogel production guaranteeing at least 40% product cost reduction and 40% reduction in energy consumption in real construction environment
Performance of C&DW materials for road applications validated by field monitoring
No full textSUPREMA – Sustainable Application of Construction and Demolition Recycled Materials in Road Infrastructures was a research project developed by the Laboratório Nacional de Engenharia Civil (LNEC), in cooperation with the University of Lisbon (IST). The use of recycled materials has major environmental and economic benefits. Its recycling contributes for a more sustainable construction and rehabilitation of road pavements. The main goals of this project were to achieve a deeper knowledge on recycled materials and correspondent technologies and to increase the confidence of road agencies and construction companies for its application in road pavements. The objective of the paper is to analyse the mechanical performance of recycled aggregates, from construction and demolition waste (C&DW), used in unbound granular layers and evaluated on experimental sections of asphalt pavements. Four sections were instrumented with strain gauges and load cells. The recycled aggregates used in these sections were: crushed concrete, crushed mixed concrete and crushed and milled reclaimed asphalt pavement (RAP). A crushed natural limestone aggregate was used in one section as a reference material. The sections were submitted to in situ load tests performed by the Falling Weight Deflectometer (FWD). In addition, an extensive program of laboratory tests was also performed related to geometrical, physical, mechanical, chemical and environmental characteristics. This paper presents the mechanical behaviour of aggregate layers obtained from the backanalysis of FWD tests results and from the instrumentation measurements. In general, it was concluded that stiffness of unbound granular layers with recycled aggregates could be considered equivalent to the stiffness of layers constructed by natural aggregates. Results of resilient modulus obtained for the studied recycled aggregates could be useful for pavement design purposes
Author reply
No full textHealth data linkage in Australia remains challenging1 as reflected in our recent experience of multi‐jurisdictional data linkage. We welcome the Population Health Research Network (PHRN) collaborative's initiatives in establishing a streamlined and unified application process in multi‐jurisdictional data linkage projects, and we fully support their vision. We acknowledge the concerns raised by Flack and Smith2 and take this opportunity to elaborate.Full Tex
Efficacy of Plasma Activation on Bleaching
No full textThis in vitro study aimed to evaluate the bleaching efficacy and color stability of nonthermal atmospheric pressure plasma (NAPP)-activated 40% hydrogen peroxide (HP) and deionized water (DW). Methods: Two hundred-forty bovine enamel−dentin samples were stained with a coffee solution before bleaching. Samples were randomly divided into 12 (n = 20): (1) HP for 5 minute (HP-5), (2) HP-10, (3) HP-20, (4) Plasma-HP-5, (5) P-HP-10, (6) P-HP-5/HP-15, (7) P-HP-10/HP-10, (8) P-DW-5, (9) P-DW-10, (10) DW-5, (11) DW-10, and (12) DW-20. After bleaching, the samples were re-stained for 48 h using red wine. The color differences measured using a dental spectrophotometer after bleaching and after re-staining were reported as ΔE1 and ΔE2, respectively. The data were analyzed using Kruskal−Wallis and Mann−Whitney U tests (p< 0.05).Complex Fluid Processin
VON HOVE MODEL OF QUANTUM-FIELD THEORY - FROM THE POINT-OF-VIEW OF INFINITE DIMENSIONAL STATIONARY MARKOV PROCESS THEORY
No full textThere are two ways to quantize the classical von Hove model. One way is to quantize the classical von Hove field equation, and the other is to quantize the classical energy functional. In this paper, their relation to each other is pointed out. As an application the second-order approximate quantization of (phi(4))2-kink field is studied.Physics, MathematicalSCI(E)0ARTICLE31127-11313
Impacts of Sediment Spiked with Diclofenac and Citalopram to the Tube-dwelling Amphipod Corophium volutator; Single Compound and Mixture Toxicity Tests
No full textDiclofenac (DCF), a nonsteroidal anti-inflammatory drug, and citalopram (CP), an antidepressive selectively inhibiting serotonin reuptake, are both some of the most used pharmaceuticals worldwide, within their field of function. They have been detected in various aquatic environments. However, very little information exists on the quantities of DCF and CP in the sediment compartment, and their toxicity to aquatic organisms. This thesis seeks to investigate the effects of sediment spiked with DCF and CP as both single- and mixture toxicity tests using the tube-dwelling amphipod Corophium volutator as model organism. We employed a dose-response approach to examine the toxicity of sediment associated DCF (0-100 μg/g dw sediment) and CP (0-200 μg/g dw sediment) as single- and mixture exposures. Endpoints included mortality and behavior. The mixture test was made with a baseline CP equivalent to its LC50 with a dose-response of DCF similar to the one used in the single test. We found that DCF did not follow a monotonic dose-response due to the lowest concentration of 0.1 μg/g dw sediment having significant lower survival compared to both the control and the concentrations of 0.5 and 1 μg/g dw sediment. Despite the non-monotonic dose-response of DCF we estimated an LC50 (excluding 0.1 μg/g dw sediment; 28.79 μg/g dw sediment) to be used as comparison to the mixture effect. CP had a LC50 of 89.70 μg/g dw sediment, and the dose-response included a long initial concentration range with no effect follow by a very rapid decrease in survival between 80 and 100 μg CP/g dw sediment. Unlike the DCF single test, the mixture test followed a monotonic dose-response with an LC50 of 4.13 μg/g dw sediment, which was almost 7 times lower than the estimated value from the single test. However, the mixture effect of DCF and CP showed an indication of being antagonistic due to the mortality of C. volutator being less than 100 % for the mixture of LC50-concentrations of both compounds. Our results imply that risk assessment using water-only exposure is not representative for predicting sediment toxicity
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