نتایج جستجو برای: high capital cost in forest harvesting

تعداد نتایج: 17335536  

رضایی , حمیدرضا, وارسته مرادی , حسین , پارسایی, فاطمه,

The species composition of a bird community is dependent upon many factors. Within any geographic area, vegetation structure may be the most important factor. The changes of bird community composition based on foraging behavior in relation to 3 different harvesting systems, including strip cutting, group selection logging, and single tree selection logging, was evaluated in a virgin area in thi...

2002
Peter Lohmander

Typical decision problems in companies in the forest sector are sequential. Important information, which was not available when the first decisions in the chain were taken, becomes available before the final decisions have to be made. The optimal decisions can usually not be found via deterministic multi period optimisation methods. This paper focuses on a linear programming approach to the tru...

Journal: :Algal Research-Biomass Biofuels and Bioproducts 2022

Using a commercially scalable system designed for processing thousands of liters day, here we evaluated the factors that affected performance, energy consumption and capital/operating costs both flocculation-based filtration-based algal harvesting systems over 16 month period. Coagulation efficiency was primary driver harvest in method, while cell lysis important method. Culture (algae) age dif...

2016
Andrea Laschi Francesco Neri Niccolò Brachetti Montorselli Enrico Marchi

A well-developed road network allows all forest activities, including wood harvesting, firefighting and recreational activities. However, forest road construction and maintenance involve economic and environmental costs. For these reasons, forest road network planning is a fundamental phase of forest management, maximising the benefits and reducing costs and impacts. Thanks to modern technologi...

2009
Charles D. Canham Glenn Motzkin Posy E. Busby David R. Foster

Question: Hurricanes and cyclones cause a wide range of damage to coastal forests worldwide. Most of these storms are not catastrophic in ecological terms, but forest responses to storms of moderate intensities are poorly understood. In regions with a high frequency of moderate hurricanes, how does variation in disturbance intensity affect the magnitude of ecological responses? Location: Nausho...

Journal: :شیمی و مهندسی شیمی ایران 0
ابوعلی گلزاری تهران، دانشگاه تهران، دانشکده تحصیلات تکمیلی محیط زیست، گروه مهندسی محییط زیست، آزمایشگاه تبدیل پسماند به انرژی محمدعلی عبدلی تهران، دانشگاه تهران، دانشکده تحصیلات تکمیلی محیط زیست، گروه مهندسی محییط زیست، آزمایشگاه تبدیل پسماند به انرژی عباسعلی خدادادی تهران، دانشگاه تهران، پردیس دانشکده های فنی، دانشکده مهندسی شیمی، آزمایشگاه کاتالیست و مواد نانوساختار عبدالرضا کرباسی تهران، دانشگاه تهران، دانشکده تحصیلات تکمیلی محیط زیست، گروه مهندسی محییط زیست، آزمایشگاه تبدیل پسماند به انرژی سجاد ایمانیان تهران، دانشگاه تهران، دانشکده تحصیلات تکمیلی محیط زیست، گروه مهندسی محییط زیست، آزمایشگاه تبدیل پسماند به انرژی

in this study, different methods of separating of the microalgae from the culture medium as one of the most important and expensive steps in achieving commercial production of biodiesel from microalgae was investigated. electro coagulation-flotation (ecf) was preferred among these methods due to its process simplicity and capability to scale up. the effect of three parameters, i.e., initial ph,...

2004
Simon B. Bird Robert N. Coulson Richard F. Fisher

Soil and litter arthropods are important in many forest ecosystem processes where they help to regulate nutrient dynamics and soil quality, and are useful bioindicators of ecosystem condition and change. This study was initiated in response to concerns about possible decline in site productivity due to intensive forestry practices. We investigated the effects of tree harvesting and site prepara...

2013
Adrian Enache Martin Kühmaier Karl Stampfer Valentina Doina Ciobanu

Nacrtak Sound development of forest infrastructure represents the backbone for sustainable forest management. However, planning forest roads, which nowadays must fulfill multiple conflicting objectives, is not an easy task. A GIS based model was developed for supporting decision making in forest road engineering. The tool allowed assessment of forest infrastructure scenarios based on multiple c...

2013
Joel Shapiro David Skeie Elena Carletti Brian Coulter Frederic Malherbe

A regulator resolving a bank faces two audiences: depositors, who may run if they believe the regulator will not provide capital, and banks, which may take excess risk if they believe the regulator will provide capital. When the regulator’s cost of injecting capital is private information, it manages expectations by using costly signals: (i) A regulator with a low cost of injecting capital may ...

2015
Kenan Melemez

The aim of this research was to identify the major factors responsible for fatal occupational accidents in forest harvesting operations in Turkey. A model was developed which determined five main factors and forty-five sub-factors leading to accidents during forestry operations, and then the Analytic Hierarchy Process (AHP) was used to determine the degree of importance of the factors and sub-f...

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