Performance properties of biocomposites from renewable natural resource

2013 ◽  
Vol 48 (26) ◽  
pp. 3237-3242 ◽  
Author(s):  
Erkan Avci ◽  
Zeki Candan ◽  
Oktay Gonultas
Keyword(s):  
Natural Resource ◽  
Performance Properties ◽  
Renewable Natural Resource

Effects of Soil Contamination on the Selection of Remediation Method

2015 ◽  
pp. 200-227 ◽  
Author(s):  
Ivica Kisić
Keyword(s):  
Soil Contamination ◽  
Natural Resources ◽  
Human Activity ◽  
Natural Resource ◽  
Contaminated Soil ◽  
Natural Activity ◽  
Harmful Substances ◽  
The Many ◽  
Renewable Natural Resource ◽  
Selection Of

Soil is a thin (up to 50cm) loose top layer of the Earth's surface, located between the lithosphere and atmosphere. Total available land area on Earth is limited, and the soil is extremely important, and in one generation it is a non-renewable natural resource. Unfortunately, nowadays the soil is, next to water, one of the most endangered natural resources. Among the many processes of soil damage, which is not being addressed at this point, is the growing importance placed on soil contamination. Contaminated soil is the soil in which human or natural activity has increased the content of harmful substances whose concentrations may be harmful to human activity, that is, for the production of plants or animals.

scholarly journals Optimal Exploitation of a General Renewable Natural Resource under State and Delay Constraints

Mathematics ◽  
2020 ◽  
Vol 8 (11) ◽  
pp. 2053
Author(s):  
M’hamed Gaïgi ◽  
Idris Kharroubi ◽  
Thomas Lim
Keyword(s):  
Differential Equation ◽  
Natural Resource ◽  
Market Price ◽  
Programming Approach ◽  
Infinite Time ◽  
Delay Constraints ◽  
Dynamic Programming Approach ◽  
Brownian Process ◽  
Renewable Natural Resource ◽  
The Value Function

In this work, we study an optimization problem arising in the management of a natural resource over an infinite time horizon. The resource is assumed to evolve according to a logistic stochastic differential equation. The manager is allowed to harvest the resource and sell it at a stochastic market price modeled by a geometric Brownian process. We assume that there are delay constraints imposed on the decisions of the manager. More precisely, starting harvesting order and selling order are executed after a delay. By using the dynamic programming approach, we characterize the value function as the unique solution to an original partial differential equation. We complete our study with some numerical illustrations.

Liability of Middleness Revisited: The Advantages for Mid-Sized Competitors in Renewable Natural Resource Industries

2019 ◽  
Vol 15 (4) ◽  
pp. 737-772 ◽  
Author(s):  
Alfonso Cruz ◽  
Tomas Reyes ◽  
Roberto Vassolo
Keyword(s):  
Product Differentiation ◽  
Natural Resource ◽  
Product Line ◽  
Capital Investments ◽  
Market Selection ◽  
Firm Level ◽  
Line Scale ◽  
The Us ◽  
Renewable Natural Resource ◽  
Curvilinear Effect

ABSTRACTSize is an important antecedent of firm survival, and several studies theoretically sustain and empirically support a ‘liability of middleness’. Indeed, it is widely believed that companies should act strategically to either become large or remain small and occupy a niche position, because mid-sized firms face the strongest market selection pressures. This study challenges that logic in renewable natural resource industries. Measuring size as product-line scale and firm-level portfolio breadth, we argue that in industries characterized by cost competition, the lack of product differentiation, large capital investments, and sharp price oscillation, scale and breadth have a curvilinear effect on survival that favors mid-sized firms rather than penalizing them. An empirical analysis of the US pulp and paper (P&P) industry over the period 1970–2000 strongly supports our arguments. This study is particularly relevant for emerging economies, in which natural resource industries represent an important portion of the total economic activity.

TECHNOLOGICAL LEADERSHIP AND SUSTAINABLE GROWTH IN A BILATERAL TRADE MODEL

2008 ◽  
Vol 10 (01) ◽  
pp. 73-100 ◽  
Author(s):  
FRANCISCO CABO ◽  
GUIOMAR MARTÍN-HERRÁN ◽  
MARÍA PILAR MARTÍNEZ-GARCÍA
Keyword(s):  
Developing Country ◽  
Natural Resource ◽  
Bilateral Trade ◽  
Sustainable Growth ◽  
Equilibrium Path ◽  
Point Property ◽  
Trade Model ◽  
Technological Leadership ◽  
State Growth ◽  
Renewable Natural Resource

This paper develops a trade model for a technologically leading country and a developing country that exploits a renewable natural resource. Technology diffuses from the technological leader to the developing country through foreign direct investment (FDI). Alternatively, innovative activities can also be carried out in the developing economy. We prove the existence and uniqueness of an equilibrium path along which both countries grow at the same rate, maintaining the natural-resource stock at a constant level. The saddle-point property for this equilibrium is proved and a sensitivity analysis is carried out. The steady-state growth rate and consumption under both scenarios are compared and the effect of resource abundance analyzed.

Synthesis of Tung Oil Monoglyceride

2014 ◽  
Vol 941-944 ◽  
pp. 1021-1025
Author(s):  
Jing Yang ◽  
Wen Jie Ma ◽  
Ni Li ◽  
Jin Hua Zhou ◽  
Han Zhou Sun
Keyword(s):  
Reaction Time ◽  
Natural Resource ◽  
Eleostearic Acid ◽  
Polyurethane Coating ◽  
Optimal Conditions ◽  
Tung Oil ◽  
Toluenesulfonic Acid ◽  
Protection Agent ◽  
Renewable Natural Resource ◽  
Acid Dosage

Tung oil monoglyceride (TOM, also called eleostearic acid monoglyceride, EAM) is a derivative of a Chinese renewable natural resource Tung oil and it is a potential monomer for polyurethane which can improve the performances of polyurethane coating. The synthesis of TOM by esterification of eleostearic acid and solketal with catalyst p-toluenesulfonic acid was investigated. Experimental results showed that the suitable synthetic conditions for TOM were as follows: a. for the esterification of eleostearic acid and solketal, with regard to eleostearic acid 0.02 mol with concentration 0.5 mol/L, mole ratio of eleostearic acid to solketal 1:1.5, catalyst p-toluenesulfonic acid dosage 5% (wt, calculated by eleostearic acid), dehydrating agent xylene, and reaction time 3 h under refluxing. The conversion of eleostearic acid peaked at 99.1% under the optimal conditions and the intermediate, solketal eleostearate was obtained. b. after deprotection under acidic condition for 4 h at 35 °C to remove protection agent acetone which was employed in the synthesis of solketal, the product TOM would obtained with yield 93.6%.

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