نتایج جستجو برای: biomass

تعداد نتایج: 63294  

Soil microbial biomass plays an important role in nutrient transformation in terrestrial ecosystems. Microbial biomass is also an early indicator of changes in total soil organic carbon. Thus, the main objective of this study was to identify and quantify the present status of soil microbial biomass carbon and nitrogen with various management practices in Himalayan rangeland. To meet the aforeme...

2014
H. V. Lee S. B. A. Hamid S. K. Zain

Lignocellulosic biomass is a complex biopolymer that is primary composed of cellulose, hemicellulose, and lignin. The presence of cellulose in biomass is able to depolymerise into nanodimension biomaterial, with exceptional mechanical properties for biocomposites, pharmaceutical carriers, and electronic substrate's application. However, the entangled biomass ultrastructure consists of inherent ...

2011
Ralph P. Overend

1. Biomass 1.1. Photosynthesis and Biomass Yields 1.2. Biomass Properties 1.2.1. Polymeric and Chemical Composition 1.2.2. Fuels Analysis 1.2.3. Physical Properties 1.2.4. Biomass Briquettes and Pellets 2. The Biomass and Bioenergy System 2.1. Biomass is the World’s Fourth Fuel 2.1.1. Individual Country Usage 3. End-use Patterns of Biomass and Bioenergy Use 3.1. Daily Living 3.1.1. Efficiency o...

Adel Sepehri Hossein Barani Naghmeh Gholami Baghi Salman Abdol-Rasoul Mahini

Plant biomass is an important factor for determining arid and semi-aridrangelands capacity. Due to the lack of proper and annual sampling of rangelands, there areno suitable data to determine biomass, range condition and proper range managementoperations. Plant biomass is one of the measurable attributes that can be assessed inrangeland studies. Since the clip and weight method is destructive a...

Journal: :علمی شیلات ایران 0
میثم طاولی m. tavoli مرکز تحقیقات ماهیان سردآبی کشور، تنکابن صندوق پستی: 467-46815 مریم اسلامی m. islami مرکز تحقیقات ماهیان سردآبی کشور، تنکابن صندوق پستی: 467-46815 سید مصطفی مهدوی s.m. mahdavi مرکز تحقیقات ماهیان سردآبی کشور، تنکاین صندوق پستی: 467-46815

the changes in density and biomass of macrobenthos were seasonally investigated from winter 2005 till fall 2006 in southern caspian sea. samples were taken with a 225cm2 van veen grab from depths of 7 and 20 meters along two transects: line 8 area (western part) and radio darya area (eastern part). totally, 5 classes of macrobenthos were identified of which the most abundant populations were po...

Journal: :iranian journal of chemistry and chemical engineering (ijcce) 2011
xu junming jiang jianchun kang sun

the possibility of using water insoluble fraction from biomass pyrolysis oil as additive in synthesis of wood-plastic novolac has been proved by using differential scanning calorimetry (dsc) and fourier transformed infra red (ft-ir) spectroscopy. synthesis of novolac with different concentrations (10, 20 and 30 wt %) of water insoluble fraction were performed. it was found that mechanical prope...

2015
Chan Zhou Zhengwen Wang Junyue Guo Zhuo Zhang Yunfei Yang Mai-He Li

Reproductive allocation is critically important for population maintenance and usually varies with not only environmental factors but also biotic ones. As a typical rhizome clonal plant in China's northern grasslands, Leymus chinensis usually dominates the steppe communities and grows in clonal patches. In order to clarify the sexual reproductive allocation of L. chinensis in the process of the...

2011
Yuanhe Yang Yiqi Luo

1. Knowledge of biomass partitioning is essential for estimating spatial patterns and temporal dynamics of root biomass in terrestrial ecosystems. The isometric hypothesis predicts that aboveground biomass scales isometrically with belowground biomass across both individual plants and community types (i.e. the slope of the log–log relationship between aboveand belowground biomass is not signifi...

2014
J. Hughes Peter J. Heggs

Heightened concerns over the amount of carbon emitted from coal-related processes are generating shifts to the application of biomass. In co-gasification, where coal is gasified along with biomass, the biomass may be fed together with coal (cofeeding) or an independent biomass gasifier needs to be integrated with the coal gasifier. The main aim of this work is to evaluate the biomass introducti...

2005
David G. Kimmel Michael R. Roman Xinsheng Zhang

Zooplankton biomass in Chesapeake Bay was estimated with an optical plankton counter mounted on a towed body (Scanfish). Normalized zooplankton biomass size spectra were calculated for three Bay regions three times a year across 4 yr. Zooplankton biomass was maximum during April, and the zooplankton size at peak biomass was large compared with July and October. The variability of the normalized...

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