NAKAKITA型燃油粘度控制系统柴油-重油自动转换的分析及改进

NAKAKITA型燃油粘度自动控制系统“柴油-重油”转换是在温度程序控制过程中以温度调节器的温度给定值为条件进行的。改进后的燃油转换是受燃油温度的给定值、测量值双重作用控制的。这可以提高控制系统和柴油机喷油设备工作的可靠性。

具有电流箝位计功能的非接触式红外测温仪

有许多应用项目既要求有温度测量值，又要求有电参数测量值．要满足这些要求，就需要使用两种不同的测量仪器．这不但会增加费用开支，而且还会给用户带来不便．

TBVMC的冷却塔热力性能优化控制方法

该文提出一种冷却塔热力性能优化控制方法,首先在温度边值测量约束(TBVMC)模型基础上,理论分析水泵转速与水量、扬程、功率与调速比的关系,提出冷却塔性能优化方法;其次,分别研究水泵、风机变频控制机理,提出基于定温差的水泵、风机频率控制方法,实现冷却塔热力性能优化控制;最后,为CEF-370A不锈钢逆流冷却塔搭建测量与执行模块,验证优化控制效果。结果表明:在各个测试温差下,频率拟合值与实测值相对偏差在±2.4%以内。

可测量液体温度的数显温度计

以半导体温度传感器为核心的电子数显温度计，具有读数直观方便、测温响应速度快、测量准确、分辨率高的特点．也避免了传统温度计中水银对环境的污染；尤其是以DS18820为代表的数字温度传感器，其直接将温度测量值转换为数字量输出，便于与单片机接口读取、显示测温数值。对于DS18820的使用不少电子专业刊物已有介绍，但是大部分是在单片机实验板上进行的，或是作为温控系统中的一部分得到应用。这些应用都无法成为一个实用的数显温度计“产品”独立使用，并且功能单一，如只能测试正温度，

AccuSense F900型气流传感器

该产品的的应用领域包括医药行业、生物学研究、食品加工及运输等，外壳由316L型不锈钢制成，高为66mm，直径为18mm，能够在潮湿或苛刻的环境下工作。其他特点包括：红、绿两个状态LED显示，可调节的温度警报上下限，读数率范围从每2s一次到每12h一次，能存储32，767个带时间标记且有NIST可追溯性的温度测量值。

Effect of Transport Times on Welfare of Pigs

The aim of the study was to investigate effect of transport times of up to 12 h on pigs＇ welfare. An observation box was located on the 3rd floor of the vehicle. Device to measure temperature, humidity and video camera to monitor pigs＇ behaviors were fitted in the box. Eighteen measurements were performed during two seasons for 4, 8, and 12 h of transport time with three replications. Meat samples were taken from longissimus dorsi （LD） and the carcases were chilled for 24 h at ＋4 ~C for pH determination. To determine cortisol, glucose, lactate, and creatine kinase concentration levels, blood samples were collected before and after transport from 90 pigs and from 20 controls that were not transported for control purposes. To evaluate behavioural alterations, frequency of events and durations were considered. Highest pH24 of 5.99 ＋ 0.29 occurred during summer at 12 h transport time. Cortisol concentrations elevated during short and decreased with an increase of transport time （P 〈 0.001）. Highest and lowest glucose concentrations for winter and summer were at 8 and 12 h transport time, respectively （P 〈 0.01）. Concentrations of lactate and creatine kinase positively correlated with transport time （P 〈 0.002）. Lying, sitting, rooting and vocalization behaviours correlated with transport time （P 〈 0.009）. Certain THI values during summer surpassed normal （〉 74） level during loading. The pH24 value correlated with transport time during summer. Lactate and creatine kinase concentrations increased with an increase in transport time but for Glucose, highest value was at 8 h transport time.

Asymptotic Formulas for Thermography Based Recovery of Anomalies

We start from a realistic half space then use to develop a mathematical asymptotic model for thermal imaging, which we analysis well suited for the design of reconstruction algorithms. We seek to reconstruct thermal anomalies only through their rough features. With this way our proposed algorithms are stable against measurement noise and geometry perturbations. Based on rigorous asymptotic estimates, we first obtain an approximation for the temperature profile which we then use to design noniterative detection algorithms. We show on numerical simulations evidence that they are accurate and robust. Moreover, we provide a mathematical model for ultrasonic temperature imaging, which is an important technique in cancerous tissue ablation therapy.

异步电动机的有限元热模型

在本文中，作者进行了异步电动机内热场的稳态有限元分析。这台被试电机是一台标准的全封闭扇冷却结构（TEFC）鼠笼型异步电动机。用相当于所分析的电机的角空间为12．857°（转子齿距）的2维径向进行了热计算。为了证实所提出的这个热模型，用安放在试验电机内的16个传感器（CTN热电阻）得到了电动机内各不同点的温度测量值。如此得到的模拟温度与测量得到的温度吻合，看来2维分析与电机的实际部件的热特性相称。