Application of Slow Curing Bitumen as a Rejuvenating Agent in Aged Bituminous Mixes

2012 ◽  
Vol 587 ◽  
pp. 62-66
Author(s):  
Amir Kavussi ◽  
Rashid Tanzadeh
Keyword(s):  
Thin Film ◽  
Natural Resources ◽  
Asphalt Concrete ◽  
Creep Testing ◽  
Mix Design ◽  
Design Criteria ◽  
Static Creep ◽  
Cold Mixes

Recycling of bituminous mixes is extending worldwide with the aim of conserving natural resources and the environment. Rejuvenating agents are generally used in recycling processesin order to soften the aged binders in mixes. Cutback bitumens have been used in Iran mainly in preparing conventional cold mixes. However, the long term good performance of these cold mixes in various parts of the country has shown less hardening of these mixes, compared with conventional HMA mixes. In this research the application of a cutbackbitumen has been investigatedas a rejuvenating agent in mixes containing laboratory aged binders. A 60-70 penetration grade bitumen from Refinery of Tehran was aged under Thin Film Oven Testing (TFOT) conditions. Asphalt Concrete samples were prepared using TFOT aged and virgin binders. Additional samples were prepared using the aged binders together with various amounts of a slow curing SC-250 cutback bitumen from the above refinery. The compacted four inchdiameter samples were tested under static creep testing. The results showed promising effects of the cutback binder in rejuvenating the aged mixes. Based on the results of this study, a mix design criteria wasset for recycled mixes containing cutback bitumen as the rejuvenating agent.

Etude de l'aménagement d'une forêt classée au Mali avec la participation des populations riveraines - Données du problème et éléments de méthodologie | A Study of the Management of a State-Owned Forest in Mali with the Participation of the Population Living nearby - Issue under Investigation and Elements of Methodology

2000 ◽  
Vol 151 (3) ◽  
pp. 80-83
Author(s):  
Pascal Schneider ◽  
Jean-Pierre Sorg
Keyword(s):  
Natural Resources ◽  
Research Methodology ◽  
Large Scale ◽  
Environmental Context ◽  
Forest Resources ◽  
The State ◽  
Commercial Use ◽  
Economic Context ◽  
The People

In and around the state-owned forest of Farako in the region of Sikasso, Mali, a large-scale study focused on finding a compromise allowing the existential and legitimate needs of the population to be met and at the same time conserving the forest resources in the long term. The first step in research was to sketch out the rural socio-economic context and determine the needs for natural resources for autoconsumption and commercial use as well as the demand for non-material forest services. Simultaneously, the environmental context of the forest and the resources available were evaluated by means of inventories with regard to quality and quantity. According to an in-depth comparison between demand and potential, there is a differentiated view of the suitability of the forest to meet the needs of the people living nearby. Propositions for a multipurpose management of the forest were drawn up. This contribution deals with some basic elements of research methodology as well as with results of the study.

Achieving over 4% efficiency for SnS/CdS thin-film solar cells by improving the heterojunction interface quality

2020 ◽  
Vol 8 (39) ◽  
pp. 20658-20665 ◽  
Author(s):  
Jae Yu Cho ◽  
SeongYeon Kim ◽  
Raju Nandi ◽  
Junsung Jang ◽  
Hee-Sun Yun ◽  
...  
Keyword(s):  
Thin Film ◽  
Solar Cells ◽  
Vapor Transport ◽  
Thin Film Solar Cells ◽  
Interface Quality ◽  
Heterojunction Solar Cells ◽  
Term Stability ◽  
Long Term Stability ◽  
Cds Thin Film

The highest efficiency of 4.225% for vapor-transport-deposited SnS absorber/CdS heterojunction solar cells with good long-term stability over two years is achieved.

scholarly journals Improvement of the long-term stability of ZnSnO thin film transistors by tungsten incorporation using a solution-process method

RSC Advances ◽  
2018 ◽  
Vol 8 (37) ◽  
pp. 20990-20995 ◽  
Author(s):  
Xiang Yang ◽  
Shu Jiang ◽  
Jun Li ◽  
Jian-Hua Zhang ◽  
Xi-Feng Li
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Thin Film Transistors ◽  
Solution Process ◽  
Solution Technique ◽  
Term Stability ◽  
Long Term Stability ◽  
Process Method

In this paper, W-doped ZnSnO (WZTO) thin films and TFT devices are successfully fabricated by a wet-solution technique.

A Low-Range Drift-Free Bio-compatible Pressure Sensor Based on P(VDF-TrFE) Piezoelectric Thin Film

2009 ◽  
Vol 1222 ◽  
Author(s):  
Xiaoyang Li ◽  
Timothy Reissman ◽  
Fan Yu ◽  
Edwin C. Kan
Keyword(s):  
Thin Film ◽  
Blood Pressure ◽  
Pressure Sensor ◽  
Equivalent Circuit Model ◽  
Swelling Pressure ◽  
Pressure Monitoring ◽  
Sensing Element ◽  
Piezoelectric Resonance ◽  
Piezoelectric Thin Film

AbstractA low-range pressure sensor (0-100kPa) based on the P(VDF-TrFE) piezoelectric thin film is proposed, where the long-term drift is eliminated by operating near the piezoelectric resonance. The pressure sensor is designed for blood pressure and tissue swelling pressure monitoring. The poled 50μm±1μm P(VDF-TrFE) copolymer film is used as the sensing element, with all fabrication and assembly materials biocompatible. A modified Butterworth-Van Dyke (BVD) [1] equivalent circuit model is used to characterize the sensor behavior. The pressure sensor exhibits negligible drift in weeks of operation. The device shows a sensitivity of 0.038MHz/kPa resonance frequency shift under stress, which leads to a maximum readout change of 1.1%/kPa in the present setup.

Medical Waste Management during COVID-19 Situation: Perspective Towards Safe Environment

2021 ◽  
Author(s):  
MANOJ KUMAR JINDAL ◽  
Dr. Santosh Kumar Sar
Keyword(s):  
Waste Management ◽  
Natural Resources ◽  
Medical Personnel ◽  
Safe Environment ◽  
Main Challenge ◽  
Number Of Patients ◽  
Open Dumping ◽  
The Government ◽  
Second Wave

The situation in the world of pandemics is rapidly changing, and the second wave of COVID-19 has put a lot of pressure on the government and private sector, which are primarily responsible for controlling the situation. COVID-19 positive cases have increased in recent months relative to last year, and the number of patients admitted to hospitals has also increased, despite the fact that few of them were denied admission due to shortage of beds. Normal people who experience any symptoms immediately isolate themselves and begin taking the COVID medications prescribed by medical personnel and their team. During these times, all domestic people tossed the wrappers and boxes of medicines into the regular trash can, and the waste was handed over to the waste collector, who treated it like any other domestic waste and disposed of it using open dumping or other methods. The goal of this perspective is to suggest the collections of these types of waste from domestics, and protect the natural resources like water, soil, and even living beings like animals from pollution (from the effect of SARS-CoV-2). The main challenge for environmental waste management agencies is determining who has COVID positive and which houses generate these types of waste; thus, proposed strategy may be beneficial to the long-term sustainability of natural resources and animals.

THE STRUCTURE OF THE ECONOMIC SPACE OF THE RUSSIAN ARCTIC

2021 ◽  
Vol 1 (7) ◽  
pp. 132-140
Author(s):  
E. A. KORCHAK ◽  
Keyword(s):  
Economic Development ◽  
Natural Resources ◽  
National Policy ◽  
The Arctic ◽  
Russian Arctic ◽  
Economic Space ◽  
Arctic Regions ◽  
Dominant Direction ◽  
Integrated Structures

The purpose of the study was to analyze the structure of the economic space of the Russian Arctic within the framework of determining the prospects for the economic development of the Arctic regions. The unevenness of the economic space of the Russian Arctic and the focus on the extraction and export of natural resources are determined. It is revealed that vertically integrated structures play a key role in the Russian Arctic. It is determined that the specific feature of this region is the ethnoeconomics, the long-term development of which is the dominant direction of the national policy in the field of agriculture of the Russian Arctic.

scholarly journals A floristic description of the Afromontane fynbos communities on Platberg, Eastern Free State, South Africa

Koedoe ◽  
2008 ◽  
Vol 50 (1) ◽  
Author(s):  
Robert F. Brand ◽  
Pieter J. Du Preez ◽  
Leslie R. Brown
Keyword(s):  
Natural Resources ◽  
Plant Communities ◽  
Conservation Management ◽  
Alien Invasive Species ◽  
Ecological Processes ◽  
The North ◽  
Shrub Community ◽  
Management Plans ◽  
Twinspan Classification

Within the Platberg area and the wider Drakensberg region, the shrinking natural resources and the threat posed to biodiversity are of concern to conservation management and require an understanding of long-term ecological processes. The vegetation of Platberg was investigated as part of an ecological survey to establish Afromontane floristic links to the Drakensberg as well as for the management of natural resources. From a TWINSPAN classification, refined by the Braun-Blanquet method, four main plant communities were identified, which were subdivided into fynbos, wetland, a woody/shrub community and grassland. A classification and description of the fynbos are presented in this article.The analysis showed the fynbos divided into two communities comprising four sub-communities and seven variants. The fynbos community had an average of 28.34 species per relevé, ranging from 14 to 54 species per sample plot. Twenty-four endemic or near-endemic Drakensberg Alpine Centre (DAC) species and 22 exotic (alien-invasive) species were recorded. Numerous floristic links with the DAC, Cape flora fynbos and grassland bioregions to the north and west were also found. The description of the fynbos plant communities can serve as a basis for the formulation of management plans for the area.

Separating the impact of oxygen and water on the long-term stability of n-channel perylene diimide thin-film transistors

2015 ◽  
Vol 26 ◽  
pp. 340-344 ◽  
Author(s):  
Ute Zschieschang ◽  
Konstantin Amsharov ◽  
Martin Jansen ◽  
Klaus Kern ◽  
Hagen Klauk ◽  
...  
Keyword(s):  
Thin Film ◽  
Thin Film Transistors ◽  
Perylene Diimide ◽  
Term Stability ◽  
Long Term Stability ◽  
The Impact

scholarly journals Analysis of thin film photovoltaic modules under outdoor long term exposure in semi-arid climate conditions

Solar Energy ◽  
2017 ◽  
Vol 157 ◽  
pp. 587-595 ◽  
Author(s):  
Ali Tahri ◽  
Santiago Silvestre ◽  
Fatima Tahri ◽  
Soumia Benlebna ◽  
Aissa Chouder
Keyword(s):  
Thin Film ◽  
Arid Climate ◽  
Climate Conditions ◽  
Photovoltaic Modules ◽  
Semi Arid
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