Utilizing a DUALEM‐421 and inversion modelling to map baseline soil salinity along toposequences in the Hunter Valley Wine district

In the oldest commercial wine district of Australia, the Hunter Valley, there is the threat of soil salinization because marine sediments underlie the area. To understand the risk requires information about the spatial distribution of soil properties. Electromagnetic (EM) induction instruments have been used to identify and map the spatial variation of average soil salinity to a certain depth. However, soils vary with depth dependent on soil forming factors. We collected data from a single‐frequency and multiple‐coil DUALEM‐421 along a toposequence. We inverted this data using EM4Soil software and evaluated the resultant 2‐dimensional model of true electrical conductivity (σ – mS/m) with depth against electrical conductivity of saturated soil pastes (EC_p – dS/m). Using a fitted linear regression (LR) model calibration approach and by varying the forward model (cumulative function‐CF and full solution‐FS), inversion algorithm (S1 and S2), damping factor (λ) and number of arrays, we determined a suitable electromagnetic conductivity image (EMCI), which was optimal (R² = 0.82) when using the full solution, S2, λ = 3.6 and all six coil arrays. We conducted an uncertainty analysis of the LR model used to estimate the electrical conductivity of the saturated soil‐paste extract (EC_e – dS/m). Our interpretation based on estimates of EC_e suggests the approach can identify differences in salinity, how these vary with parent material and how topography influences salt distribution. The results provide information leading to insights into how soil forming factors and agricultural practices influence salinity down a toposequence and how this can guide soil management practices.     

微波电路电测及其计算方法

从实际工程的角度出发，对电路电测方法进行了论述。在微通信工程中，需要获得障碍物的位置和高度，最合理的天线高度组合和障碍物绕射损耗等参数，为此论述了微波电路电测方法及技术要求。在大庆－秦皇岛输油管道通信工程中采用了Ａ，Ｂ测试法进行测试，得到高度－损耗曲线。这种曲线给出相对自由空间接收电平与收，发天线高度之间的关系。在测试所得的高度－损耗曲线与断面图相结合的基础上，由绕射损耗计算公式推出了几种常见障碍     

How to perform transvenous electrical cardioversion in horses with atrial fibrillation

Electrical cardioversion of atrial fibrillation is a well-established technique for restoration of sinus rhythm in humans. While transthoracic cardioversion is more commonly used, transvenous electrical cardioversion (TVEC) has been reported as having higher efficacy at substantially lower energy levels. In horses, treatment of atrial fibrillation has essentially been limited to the administration of quinidine salts either orally or intravenously. TVEC provides an alternative to quinidine salts, especially for those animals in which quinidine is neither effective nor tolerated. The present report details this technique in horses, discusses possible complications of the procedure, and provides guidance for successful outcome. Still and video images are used to illustrate details with regard to TVEC techniques in horses. Please view supplemental material for the videos.     

大学食品科学与工程专业的多模态PPT教学研究

在介绍多模态的基础上,分析多模态PPT教学的优缺点,探讨如何有效将多模态PPT教学应用于大学食品科学专业教学中,对于大学生物科学专业教学具有重要的指导和建设意义.     

浅析测定植物抗旱性方法的应用

本文介绍了干旱对植物伤害及表现,根据国内外相关文献资料对叶绿素荧光法和电阻抗图谱法两种测定植物抗旱性方法进行概述。     

高校师范生专业素养提升的环境要素分析

河南省第十二届师范生教学技能大赛于2014年11月7日至9日在河南新乡举办,参赛选手以先进的教学理念、娴熟的教学技能于流畅的语言表达,展示了扎实的学科基本功和良好的精神面貌。郑州师范学院参赛选手虽准备充分,全情投入,但终因微弱劣势未获理想成绩。大赛让学生打开了视野,增长了见识,锻炼了队伍,发现了问题并明确了努力方向。作为此项赛事的亲历者,现结合大赛情况就郑州师范学院教学质量提升进行研究反思,以期抛砖引玉。     

PLC在电气自动控制中的应用

随着电气控制技术的发展和计算机技术的广泛应用，单片机逐渐取代传统逻辑开关，但是单片机技术复杂，编程难度高。而可编程控制器，它以控制功能强大，通用性好，编程简单易操作，控制稳定等特点正在成为电气自动控制系统中重要的开关量逻辑控制元件，并结合，声、光、电、液等信号采集元件和变频伺服技术成为电气自动控的核心部件。     

非会计专业《会计学》课程教学方法刍议

目前,许多高校非会计专业都将《会计学》课程作为一门专业必修的基础课程。结合多年的非会计专业会计教学经验,笔者认为根据专业特点,采用灵活多样的教学方法是实现非会计专业《会计学》课程教学目标,提高《会计学》教学效果的重要手段。     

晋中市左权县作物土壤有效镁营养状况分析

以长治市左权县东隘口村土壤为研究对象,将48个分别来自玉米地、蓖麻地、谷子地、药材地内的不同土壤类型样品,用原子吸收分光光度计进行有效镁含量的检测。结果表明,试验区内,土壤有效镁含量处于中等水平,且有效镁含量与电导率呈现正相关关系。不同作物下的土壤有效镁含量无显著性差异,而在不同土壤类型间差异性显著。土壤缺镁时,可以施用硫酸钾镁。     

应用型地方本科院校土地资源管理专业建设研究——以山东建筑大学为例

针对应用型地方本科院校土地资源管理专业就业和人才培养中的问题,以山东建筑大学专业建设为例,分析了地方性高校的特点和土地资源管理专业建设面临的新形势,提出应该从地方性高校特点出发,适应社会需求,创新现有的人才培养模式,推动专业建设的可持续发展。