排序方式： 共有11条查询结果，搜索用时 109 毫秒
1.
介绍了无线恒温控制系统的作用和组成、单片机Atmega8L、无线模块nRF905的特点和引脚、步进电机的控制和驱动，热敏电阻的连接以及整个系统的软硬件实现。 相似文献
2.
A Study on the Meat and Bone Meal or Poultry By-product Meal as Protein Substitutes of Fishmeal in Concentrated Diets for Paralichthys olivaceus 总被引：2，自引：0，他引：2
A study was conducted to evaluate the effects of meat and bone meal （MBM） and poultry by-product meal （PBM） as the replacement of fishmeal in the diets on the growth performance, survival and apparent digestibility coefficient （ADC） of Japanese flounder （Paralichthys olivaceus）. The experimental diets included 0%, 20%, 40%, 60% and 80% MBM or PBM replacement of total fishmeal respectively. All diets were iso-nitrogenous and isocaloric. The results showed that there are no significant differences （P 〉0.05） in growth performance among the treatments fed with 0% -60% MBM replacement of fishmeal, while the percent weight gain （WG, % ）, body length gain （BLG, % ） and ADC significantly decrease when fishmeal is replaced by 80% MBM. The result showed also that there are no significant differences （P 〉0.05） in growth performance and ADC among all treatments fed with the diets with 0% -80% replacements of fishmeal with PBM. 相似文献
3.
在宽频带数字地震观测技术领域,提出一种基于数字音频接口(S/PDIF接口)的数据采集电路板快速评估方法。该方法在数据采集电路设计过程中,在模拟/数字转换电路的输出端增加了一组S/PDIF数字音频接口,将模/数转换结果转换为符合音频传输标准的编码数据,并将此数据利用外置声卡同步传输到计算机,在计算机上进行数字抽取滤波、频谱分析等数据处理与解析,从而实现对地震数据采集电路板的快速评估。实验结果表明,该方法思路清晰,实现简便,结果有效可靠,能够解决常规测试评估方法中存在的问题,在高精度、高采样率数据采集技术研发和测试评估方面,具有比较强的实用性和应用前景。 相似文献
4.
介绍基于C8051F330单片机的地震观测系统中故障报警子系统的工作原理,并对温度报警设计中的问题进行分析。 相似文献
5.
A study was conducted to evaluate the effects of meat and bone meal (MBM) and poultry by-product meal (PBM) as the replacement
of fish meal in the diets on the growth performance, survival and apparent digestibility coefficients (ADC) of Litopenaeus vannamei. The basal diets were formulated with 22% fish meal and other ingredients which provided about 40% protein and 9% lipid in
the diet. The experimental diets included MBM or PBM to replace 0, 20%, 40%, 60% and 80% of total fish meal respectively.
All diets were iso-nitrogenous and isocaloric in gross terms. The results showed that there were no significant differences
(Pτ;0.05) in growth performance and ADC among the treatments fed with the diets in which 0–60% fish meal had been replaced with
MBM, while the percent weight gain (WG, %), body length gain (BLG, %) and ADC significantly decreased when the MBM was up
to 80% of the fish meal. There were no significant differences (Pτ;0.05) in growth performance and ADC among all the treatments fed with the diets in which 0–80% fish meal had been replaced
with PBM. 相似文献
6.
利用32位微处理器控制Σ-Δ型模数转换器ADS1248,实现了MEMS加速度传感器输出电压信号的模数转换,采集到的地震信号满足强震数据采集要求。 相似文献
7.
为了开展雷达天文科学研究, 将射电望远镜接收的雷达回波信号进行采集和记录, 研究基于SNAP (Smart Network ADC (Analog to Digital Converter) Processor)硬件实验板和快速存储服务器设计并开发了雷达天文基带数据采集与记录系统. 该系统采用CASPER (Collaboration for Astronomy Signal Processing and Electronics Research)提供的图形化FPGA (Field Programmable Gate Array)开发工具流, 设计了双通道、256MHz带宽信号采集和VDIF (VLBI (Very Long Baseline Interferometry) Data Interchange Format)基带数据输出固件程序; 基于HASHPIPE (High Availability SHared PIPeline Engine)多线程管理引擎开发了双万兆以太网口实时基带数据存储程序, 存储带宽达到1GB/s; 最后编写了VDIF格式到雷达天文格式的转换程序. 经过脉冲星信号观测实验检测, 该系统准确、可靠. 相似文献
8.
YRY�����Ӧ�������ݲɼ��ĸ߾���ʵ�� 总被引：1，自引：1，他引：0
??????????????????YRY????????????????????????6λ???????????????24λ??-????ADC ADS1201?????????????????·??????????????Χ??????????????????????????????????????????????????????????????????????????????Ч???? 相似文献
9.
10.
目的:探讨MRI扩散加权成像(DWI)在2型糖尿病患者的胰腺检查应用价值。方法:取纳入标准的75例2型糖尿病患者,根据病程分为三组:<2年、2~10年、>10年。同时选取25例健康人群作为健康对照组。采用MRI平扫、多期动态增强扫描及DWI检查测量患者胰腺的扩散系数(ADC),观察糖尿病患者胰腺的MRI及DWI信号表现特征。结果:DWI检查测量健康对照组、糖尿病<2年、2~10年、>10年三组患者胰腺体部的ADC值,取b值500 mm2/s时,分别测量每组的ADC均值为(2.00±0.17)×10-3 mm2/s,(1.94±0.09)×10-3 mm2/s,(1.86±0.13)×10-3mm2/s,(1.77±0.25)×10-3 mm2/s,与健康对照组相比,P值分别为0.023、0.010、0.008,两者差异具有统计学意义(P<0.05)。75例糖尿病患者MRI检查胰腺,1例追踪确诊为胰腺癌。结论:糖尿病患者胰腺DWI信号随病程延长而逐渐变化,能反应胰腺细胞功能改变,具有一定的临床参考价值,具有对早期单纯表现为糖尿病的胰腺癌患者进行筛查的潜能。 相似文献