搜索结果: 1-14 共查到“农学 TDR”相关记录14条 . 查询时间(0.076 秒)
Rapid Percolation of Water through Soil Macropores Affects Reading and Calibration of Large Encapsulated TDR Sensors
gap preferential flow rain sensor installation
font style='font-size:12px;'>
2015/7/28
The electromagnetic soil water content sensors are invaluable tools because of their selective sensitivity to water,
versatility, ease of automation and large resolution. A common drawback of most t...
Spatial and Temporal Distribution of Soil Water Content in Fields under Different Vegetation Conditions Based on TDR Measurements
electromagnetic wave Andisol multiple probes with different lengths
font style='font-size:12px;'>
2009/9/10
TDR (Time-domain reflectometry) is an advanced method for monitoring the water content in fields.TDR measurements can provide accurate information about vegetation effects on both spatial and temporal...
Application of TDR measurement technology for construction materialsin semi-scale experiments**
moisture content two-needle TDR sensors semi-scale experiments construction materials
font style='font-size:12px;'>
2008/11/26
Application of TDR (Time-Domain Reflecto- metry) measurement technology for the investigation of hygric performance for construction materials in the conditions of a semi- scale experiment is present...
Accuracy of soil moisture measurement by tdr technique
time domain reflectometry soil moisture measurement error
font style='font-size:12px;'>
2008/11/26
The error in the measurement of volumetric water content by the TDR technique results from the correlation imperfections between the directly measured values of soil refractive index, n, and the real ...
Application of TDR measurement technology for construction materialsin semi-scale experiments: A practical example
moisture content TDR thermal insulation
font style='font-size:12px;'>
2008/11/26
A practical example of the application of TDR (Time-Domain Reflectometry) measurement technology for investigation of hygric performance of systems of construction materials in a semi-scale experiment...
Effect of aggregate size on the water content estimated with time domain reflectance (TDR)
TDR calibration aggregated soil
font style='font-size:12px;'>
2008/11/24
Time domain reflectance (TDR) gives reliable estimates of the water content of structure-less soil. The effect of soil structure on the performance of TDR has received relatively little attention in c...
Calibration of TDR for moisture determination in peat deposits
peat soils TDR calibration bulk density
font style='font-size:12px;'>
2008/11/21
Determination of soil water content using the Time Domain Reflectometry (TDR) method is recently considered modern and widely used. The practical application of TDR requires its calibration ie determ...
Comparison of deep seepage estimations of a virtual with a real lysimeter by means of TDR-measurements
deep seepage TDR measurements lysimeter unsaturated hydraulic conductivity
font style='font-size:12px;'>
2008/11/21
The virtual lysimeter concept was tested in comparison with a real lysimeter and found to be suitable for quantifying effective deep seepage dynamics in sandy soils. Discharge measurements and calcula...
Comparison of Open-Ended Coax and TDR sensors for the measurement of soil dielectric permittivity in microwave frequencies
TDR Open-Ended Coax sensor soil permittivity
font style='font-size:12px;'>
2008/11/21
The study presents a comparison of two sensors for the determination of the complex permittivity of soil: a three- rod TDR probe and an Open-Ended Coax probe. The measurements were performed using a T...
Recent software improvements in moisture (TDR method), matric pressure,electrical conductivity and temperature meters of porous media
soil water content time domain reflectometry porous media user interface
font style='font-size:12px;'>
2008/11/12
The FOM/mts (Field Operated Meter of moisture, temperature and salinity of soils) and TDR/MUX/mpts (Time Domain Reflectometry meter with a multiplexer for measurement of moisture, matric pressure, tem...
TDR and low-frequency measurements for continuous monitoring of moisture and density in a snow pack
snow density moisture time domain reflectometry
font style='font-size:12px;'>
2008/11/12
An in-situ sensor for the simultaneous measurement of density and liquid water content of snow is presented in this paper. The system consists of radio frequency transmission lines of up to 25 m lengt...
Soil moisture and bulk electrical conductivity variability measured by TDR
TDR water content measurement soil heterogeneity random field parameters
font style='font-size:12px;'>
2008/11/11
The result of numerous TDR measurements of heterogeneous soil water content are shown. Some statistical parameters of measured water content and bulk electrical conductivity fields are calculated. TDR...
TDR探针两种埋设方式下土壤水分的测定及其比较
时域反射仪 土壤水分 测定
font style='font-size:12px;'>
2007/12/14
本项试验将时域反射仪（ＴＤＲ）探针分别竖埋和横埋于冬小麦农田，测定了农田各土层土壤含水量和土体贮水量，分析了这两种埋设方式下实测值之间的绝对偏差和相对偏差。结果表明，ＴＤＲ探针在竖埋和横埋方式下测定值之间的偏差主要在土壤表层，其原因是土壤特性在土表层垂直方向上的变异较大，以及不同埋设方式下探针测定的土壤体积范围不一。文章指出，当ＴＤＲ应用于农田土壤贮水量测定时，为了提高测定精度，建议ＴＤＲ探针在土...
TDR 在半干旱区土壤湿度测量中的标定及其应用
font style='font-size:12px;'>
2007/7/28
期刊信息
篇名
TDR 在半干旱区土壤湿度测量中的标定及其应用
语种
中文
撰写或编译
作者
刘宏谊,马鹏里,杨兴国,杨启国,王润元
第一作者单位
刊物名称
地球科学进展
页面
1~5
出版日期
2005年
9月
日
文章标识(ISSN)
1001-8166
相关项目
半干旱雨养农业区地气相互作用观测试验研究