搜索结果: 1-15 共查到“农学 physical”相关记录168条 . 查询时间(0.218 秒)
Laser mapping project shows effects of physical changes in Antarctica's Dry Valleys（图）
Laser mapping project physical changes Antarctica Dry Valleys
2017/9/4
Researchers funded by the National Science Foundation (NSF) have publicly released high-resolution maps of Antarctica's McMurdo Dry Valleys, a globally unique polar desert.The high-resolution maps cov...
Effect of the skid trail cross section and horizontal alignment on forest soil physical properties
soil bulk density ground-based skidding cross slope Civil3D software Bahramnia forest
2017/6/26
Horizontal alignment and cross section characteristics of a skid trail in a ground-based skidding system including curves, wheel ruts and cross slope can impact on the forest soil. In this study the m...
Operator's physical workload in simulated logging and timber bucking by harvester
forest harvesting biofeedback ergonomics
2016/6/3
The aim is to conduct experimental measurements and analyses of physical and mental workload of harvester operators. Among other things, monitoring and analyses of work conditions and workload help re...
Detection of the effects of management and physical factors on forest soil carbon stock variability in semiarid conditions using parametric and nonparametric methods
soil organic carbon CART modelling, neural networks
2015/11/26
Forest soils in western parts of Iran are being degraded by inappropriate management. The soil organic carbon (SOC) stock was dominantly affected by this type of degradation. On the other hand, SOC is...
Effects of rubber-tired skidder and farm tractor on physical properties of soil in plantation areas in the north of Iran
aspen skid trail skidding machine soil disturbance timber skidding
2015/9/15
Physical properties of soil can be affected by machines that are used for skidding which have the potential to impact soil sustainability and forest productivity. The present study evaluated the effec...
The analysis of relationships between chemical composition, physical, technological and health indicators and freezing point in raw cow milk
dairy cow health state secretion disorder milk components physical indicator technological property
2015/6/8
The milk freezing point (MFP) is used for the control of milk food chain quality especially for possible adulteration with water. A crucial issue is the acceptance of the legislative discrimination li...
Longitudinal patterns in fish and macrozoobenthos assemblages reflect degradation of water quality and physical habitat in the Bílina river basin
fish community macroinvertebrates pollution channelization Elbe basin
2015/6/8
The aim of this study was to provide the first account of fish and macroinvertebrate communities in a heavily degraded river basin in the Czech Republic. Fish and macrozoobenthos were surveyed at 18 s...
Mechanical behaviour under compression loading and some physical parameters of Japanese quail (Coturnix coturnix japonica) eggs
quail egg physical properties mechanical behaviour
2015/6/4
Technical information and data on the physical and mechanical properties of agricultural and animal products are necessary to design various equipments for agriculture and industry. In this study some...
Effect of dietary sodium selenite,Se-enriched yeast and Se-enriched Chlorella on egg Se concentration, physical parameters of eggs and laying hen production
sodium selenite Se-yeast Se-Chlorella laying hens Se in eggs Haugh unit hen production
2015/6/2
ISA Brown laying hens at 24 weeks of age, housed in laying battery cages, were used in this 4-group experiment. One group was fed a basal diet containing primarily maize, soybean meal and wheat. Selen...
Monitoring of physical activity for management of cow reproduction
cow physical activity pedometers
2015/6/1
The objective of this paper was to assess by means of pedometers the period of anoestrus in a herd where the calving interval was 400 days and to detect the influence of some factors (breed, year, sea...
Earthworm biomass and abundance, soil chemical and physical properties under different poplar plantations in the north of Iran
soil properties populus clones populus caspica organic carbon poplar
2015/4/24
We evaluated earthworm abundance and biomass in plantations of different poplar species and clones as well as the effect of some soil chemical and physical properties on them. Even-aged poplar species...
Physical characteristics affecting the infiltration of high intensity rainfall into a soil profile
flood variable source areas soil retention capacity soil moisture suction pressure
2015/3/10
Flooding caused by intensive precipitation has been in the centre of attention of both general public and scientists. From the flood risk management perspective, an integrated approach to catchment ma...
Impact of water quality, cultivation, and cropping systems on infiltration and physical properties of an arid clay soil
aggregate stability crop cover infiltration tillage wastewater
2015/3/10
Irrigation with treated wastewater is essential for increasing crop production in arid and semi arid regions. Field experiments were conducted on rainfed clayey soil to investigate the impact of water...
Selection of catchment descriptors for the physical similarity approach. Part II: Application
a priori SAC-SMA model parameters catchment characteristic MOPEX catchments regionalisation
2015/3/9
This paper demonstrates an application of the previously published method for selection of optimal catchment descriptors, according to which similar catchments can be identified for the purpose of est...
Selected physical properties of initial soils on the outside spoil bank of the Belchatow brown coal mine
forest reclamation spoil bank initial soils
2015/3/6
The purpose of the study was to assess, in respect of selected physical properties, the reclamation of the northern slope of the outside spoil bank of the Belchatów brown coal mine by reforestation ca...