不良导体导热系数快速测定仪的数据处理系统的设计与开发

介绍了一种不良导体导热系数快速测定仪的数据处理系统，采用单片机进行数据采集、解偏微分方程等复杂数据的处理。完成测试条件的自动控制，导热系数的自动求取。     

不良导体导热系数快速测定仪的数据处理系统的设计与开发

介绍了一种不良导体导热系数快速测定仪的数据处理系统,采用单片机进行数据采集、解偏微分方程等复杂数据的处理.完成测试条件的自动控制,导热系数的自动求取.     

不良导体导热系数的测量方法的改进

该测量方法有效地解决了用热电偶直接带动电表时电表表针偏移很小、造成读数困难，且读数误差较大的问题。对加放大器前后的电路特性做了分析和比较，并对加放大器前后的实验结果进行了分析，得出了增加放大器后的实验结果较未加放大器的实验结果误差较小的结论。     

不良导体导热系数测量实验的研究

导热系数是反映材料导热性能的物理量.导热系数的测量方法有稳态法和动态法两类,采用稳态法测量不良导体导热系数,通过实验来加深学生对热传导规律的理解,掌握稳态法测量导热系数的基本方法.     

单片机在非稳态法测定不良导体热导热系数中的应用

介绍了在非稳态法测定不良导体导热系统中，使用单片机进行数据采集、解偏微分方程等复杂数据的处理、测试条件的自动控制，导热系数的自动求取，能直接显示待测材料的导热系数。     

测量不良导体导热系数实验装置的改进

利用稳态法测量不良导体的导热系数时,从实验原理推导到实验数据的测量过程中均引入一定的误差,现将原来置于散热盘下面的小风扇挪至侧面对其散热并插入隔板,在测量散热盘的冷却速率时,基本保证散热盘上、下及侧表面均处于稳定的强迫对流散热环境;电源改用TDGC1-1稳压调压交流电源,实现了对加热功率的精确控制;利用UT325型数字式测温仪采集温度信号,实时液晶显示并与计算机通讯,通过计算机存储数据并进行拟合处理。与传统测量方式相比,改进后的设备测定的导热系数误差小,更接近样品盘的固有属性值。     

基于单片机的不良导体导热系数实验仪的研制

研制了基于89C55单片机的不良导体导热系数实验仪,应用MAX6675芯片完成热电偶冷端补偿和数据AD转换,通过可控硅调相方式控制加热温度,LCD显示各项实验参数和曲线.该文介绍了系统硬件和软件的设计.     

稳态法测量不良导体导热系数

导热系数是一重要的物理量,不良导体导热系数的测定,是热学中比较重要的实验,用稳态法测不良导体导热系数是一种常见的方法,它较其它方法更方便,精确度更高。测定不良导体的导热系数的原理是法国数学家、物理学家约瑟夫·付里叶给出的导热方程式,在物体内部,垂直于...     

稳态法测量不良导体导热系数的改进设计

对稳态法测量不良导体导热系数实验中样品盘进行侧面包覆保温改进,使得侧面散热大大减少,以满足实验中忽略侧面散热的前提条件。实验发现,样品盘侧面包覆保温材料后,与未包覆情形相比,系统达到稳态时散热盘温度提高了0.5℃,这是由于样品盘侧面散热量减少,这部分热量传导至散热盘所致。同时,由于散热盘稳态温度提高,相应稳态温度附近的降温速率比原来提高了约7%。综合所有数据得到样品的导热系数与未包覆时相比,提高了11%。这说明在完全忽略样品盘侧面散热时样品的导热能力被低估了;同时该样品盘侧面保温包覆方法为降低该实验误差,提高实验结果精确度提供了一种方法。     

良导体导热系数测量

介绍了一种测量良导体导热系数的方法,该方法克服了传统实验的不足,采用数字温度传感器测温、控温技术和直流电功实时测量,使实验误差得到减少,而实验操作变得更直观、方便,实验技术变得更先进。     

"电子衍射"实验的图像采集和数据处理系统

探索计算机在近代物理实验中的图像采集和数据处理,研究其在“电子衍射”中的应用。     

Reconfigurable-system-on-chip implementation of data processing units for space applications

Application-specific data processing units （DPUs） are commonly adopted for operational control and data processing in space missions. To overcome the limitations of traditional radiation-hardened or fully commercial design approaches, a reconfigurable-system-on-chip （RSoC） solution based on state-of-the-art FPGA is introduced. The flexibility and reliability of this approach are outlined, and the requirements for an enhanced RSoC design with in- flight reconfigurability for space applications are presented. This design has been demonstrated as an on-board computer prototype, providing an in-flight reconfigurable DPU design approach using integrated hardwired processors.     

凝华结霜导热系数数值计算分析

用数值计算方法,验证了作者本人提出的水蒸汽凝华结霜过程中在冷壁面上形成的霜层的导热系数表达式,并将结果与前人的实验数据进行了比较分析,取得了较好的吻合性,增强了导热系数理论表达式的实用价值.     

基于光伏电源的数据采集和处理系统设计

在光伏电源系统中,采用数据采集和处理系统进行实时检测,监控,可有效提高系统的工作可靠性,大大降低系统运行管理费用.在该系统的设计中,根据系统特点和器件的特性计算确定了系统的基本参数和主要功能.据此采用了具有通用外围接口的PSD311可编程单片机系统,设计出了软件流程和硬件电路,达到了电路的最简化和可靠性的有机统一.并可通过RS232串行通信端口外接MODEM调制解调器或GSM手机短信息模块实现远距离计算机、手机的实时遥测、遥控.本系统已在几个光伏电源系统中试用,运行效果良好.     

The effect of practice and expectancy of inferential questions on poor comprehenders' inferential processing and monitoring

Background

Previous studies have shown that undergraduates improve their answering and monitoring accuracy when they exclusively practice and expect inferential questions after reading. This study examined whether children with poor comprehension, who struggle particularly with inferential questions, would benefit from similar practice with and without feedback.

Methods

To address this question, 44 poor comprehenders and 44 control participants from 6th–9th grades practiced answering literal or inferential questions after reading each of three texts. They were also asked to predict their success in these questions, whereas some received feedback on their prediction (monitoring) accuracy. Then, participants read an additional three texts, but answered both practiced and unpracticed types of questions after reading all texts. They also predicted their success after reading each text.

Results

Both poor and good comprehenders answered literal questions more accurately when they had practiced. However, only good comprehenders improved their answering of inferential questions when they had practiced. No differences were found between the groups in monitoring accuracy. Feedback had a positive effect on answering accuracy, irrespective of practice.

Conclusions

Poor comprehenders differentiate to some extent between literal and inferential questions and are flexible enough to execute a different text processing plan for each type of questions. However, they presumably lack the knowledge and/or resources to execute inferential processing efficiently during reading. Moreover, all children seem to have difficulty with comprehension monitoring. Practicing and/or expecting one type of questions, with or without feedback, is insufficient for improving this ability.

     

数据处理在计算机辅助测试系统中的应用

计算机辅助测试系统通常采用数字滤波与整体曲线拟合的数据处理方法.以一组泵类试验中的实测数据为例,说明数据处理的原理、计算和实现的过程,以及通过曲线拟合得到的产品性能曲线.