查询词典 infertile soil

Study on the polarized reflectance characteristics of soil.

土壤的偏振反射特征研究。

The objective of the present paper was to develop a methodology to estimate soil attributes using spectral reflectance.

研究的目的是应用波谱反射建立一个新的研究方法来估算土壤属性含量值。

Since the formation of soil mechanics, this problem has been studied widely both at home and abroad, and the relevant achievements are quoted or reflected in the design code for groundwork foundation engineering. However, some other problems involved in Iheoretical analysis at deep level, new analysis methods, engineering practicality as well as spot experimentation are worth further research.

自土力学学科形成以来，国内外虽然对该问题作过广泛的研究，取得了系列成果，并在地基基础设计规范中得到了引用或反映，但仍有一些深层次的理论分析问题，新的分析方法，工程实用化及现场试验方面的问题仍值得进一步研究。

Photosynthesis, Chl fluorescence, Gas Exchange, Root research solutions, Soil Moisture Content, Time Domain Reflectometry

56光合作用，叶绿素荧光，气体交换，根系研究解决方案，土壤水分，时域反射仪

Frequency Domain Reflectometry is an effective instrument of measuring soil volumetric water content, but it need a good calibration.

为了获得精确的土壤含水量测定数据，在室内和田间分别进行了频率域反射仪测定土壤含水量的校正，并在田间运用土钻取样和烘干法对模型参数进行了验证。

The soil volumetric moisture content can be determined by the Time Domain Reflectometry and the Frequency Domain Reflectometry.

其中烘干法简单可靠，但是不可以实现计算机实时监测；射线法测试结果精确，但是成本太高，还有辐射危险；TDR和FDR的是目前比较流行的测试方法，但是不适合实时监测土壤剖面含水率。

In order to cancel the noise in TDR signal and retain the faint reflectometry signal made by deformation of rock and soil, it is proposed to use method integrated filtering and noise canceling based on wavelet transform with characteristic of TDR signal.

为去除TDR法岩土体变形监测信号中因多种原因而产生的噪声，同时最大限度地保留岩土体因变形而导致的微弱反射信号，提出结合小波函数和TDR监测信号特点的滤波与去噪方法。

MEASUREMENT OF SOIL PHYSICAL PROPERTIES WITH THERMO-TIME DOMAIN REFLECTOMETRY Ⅰ.

利用热脉冲-时域反射技术测定土壤水热动态和物理参数Ⅰ。

In this paper the technique of Thermo Time Domain Reflectometry is introduced to make measurements of a wide range of soil physical properties.We outline the theories of TDR technique for water content and electrical conductivity measurement, and heat pulse technique for determination of volumetric heat capacity, thermal conductivity, and thermal diffusivi...

本文以热脉冲技术和时域反射技术的理论为基础，介绍了利用热脉冲技术时域反射技术连续定位测定土壤含水量、电导率、温度和热特性的原理，并利用土壤热特性与容重和含水量的关系，导出了土壤容重、饱和度和通气孔度的计算公式。

The best way to undo the problem of soil erosion is to reforest the cultivated land.

解决水土流失问题的最好办法是退耕还林。

Listen,point and check your answers.

听，指出并且检查你的答案。

Warming needle is one of effective treatment methods for knee arthralgia aggravated by cold,and it is simple,safety,so it should be developed in clinical acupuncture and moxibustion extensively.

但以本院科针灸门诊在2005年1月—2006年6月期间共收治膝痛患者100余例，经过临床的诊断后，其中施以温针治疗的48例，疗效显著，报道如下。1临床资料本组病例48