نتایج جستجو برای: modified beech sawdust
تعداد نتایج: 255835 فیلتر نتایج به سال:
Abstract The difference between physical activations (by sonications) and chemical ammonia) on sawdust biochar has been investigated in this study by comparing the removal of Cu(II) ions from an aqueous medium adsorption (SD), sonicated (SSD), ammonia-modified (SDA) with stirring at room temperature, pH value 5.5–6.0, 200 rpm. was prepared dehydrations wood reflux sulfuric acid, formed activate...
The efficiency of two methods of pretreatment (NaOH and H2O2) on lignocelluloses-saw dust, wheat straw, sugarcane bagasse and rice bran-was compared in the present study. Alkali treatment of lignocelluloses relatively removed more hemicelluloses and lignin leaving behind cellulose content in the residues than peroxide treatment. Crude cellulase of Aspergillus niger, produced on the pretreated s...
Mechanical densification is a process of transforming loose biomass into dense pellets. In this study, a wood pelleting plant was chosen to evaluate the total energy consumption, environmental emissions and cost of pellet production using different alternative fuels for the drying process. The fuels compared were natural gas, coal, dry and wet sawdust, and ground wood pellets. The process model...
The population structure of red beech (Nothofagus fusclI) is described for four forest stands situated at different altitudes on 1\.louot Colenso. Data cn red beech seedling densities and frequency distributions of living and dead tree dir:.meters (d.b.h.) arc presented. Red beech seedlings are shown to be more numerous, and on average larger, en decaying red beech logs than elsewhere. This see...
Fallow deer did not prefer either of the two main canopy species (silver beech, Nothofagus menziesii, and radiata pine, Pinus radiata), or any of the common indigenous shrubs, ferns, herbs and monocotyledons in three habitat types (beech, shrub-hardwood, and exotic forest). They did prefer all the common sub canopy tree species, and these comprised the bulk of diet in all habitats. Broadleaf (G...
Forest containing rata (Metrosideros umbellata) and kamahi (Weinmannia racemosa), with scattered trees of silver beech (Nothofagus menziesii), was sampled on Cedar Hill, Owaka Valley, Catlins Ecological Region. Diameter frequency distributions, age estimates, and basal area measurements show single cohort establishment of rata and kamahi, whereas three establishment phases of silver beech are e...
Changes in density and breeding of the house mouse (Mus musculus) in a New Zealand forest dominated by hard beech (Nothofagus truncata) were monitored for 2.5 years. Mice bred during winter and increased dramatically in density only during a beech mast year. Mice readily ate the endosperm and embryo of hard beech seed in the laboratory and chemical analysis showed it to be a very nutritious foo...
We investigated the effects of particles of sawdust delivered through a special device at known concentrations (close to the threshold limit value-short term exposure limit (TLV-STEL) of 10 mg.m-3) on FEV1 and PC20 in 12 asthmatic subjects free of clinical sensitization to this product. Subjects were studied over two days (day 1: exposure to sawdust; day 2: sham exposure) in random order with a...
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