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基于ARM的温度采集与以太网传输系统重点是实现稳定地采集实时温度、批量传送采集结果。系统采用基于ARM内核LPC2214对温度传感器LM235输出的模拟信号进行采集;用DM9000控制以太网传输采集结果。基于DM9000的以太网传输具有较高的可靠性,适合批量数据传输,并且可实现较远距离通信。此外,为方便调试和扩展,设计串口通信模块和JTAG仿真调试接口模块。最终,实现对温度的实时采集与传输。 相似文献
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The minimum variance and tangential discontinuity analyses are used to find the normal directions of the magnetopause using
550 crossings from ISEE 1 and 2, AMPTE/IRM, and IMP 8 satellites. Then, the average shape of the magnetopause is studied by
using two-region fit procedure. These studies show: (i) most of the crossings are reasonably characterized as tangential discontinuity;
(ii) there does appear to be east-west and north-south asymmetry in the shape of the magnetopause; (iii) the magnetopause
in the equatorial region is swept back from the vacuum location for both northward and southward IMF, which means that the
simple single conic section used in previous fits may not be appropriate to the entire shape of the magnetopause, especially
at the nightside.
Project supported by the National Natural Science Foundation of China (Grant No. 49374222). 相似文献
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地幔中铀的存在状态及其地球化学含义 总被引：2，自引：0，他引：2
用235U诱发裂变径迹法对地幔岩捕虏体中铀的分布、含量及存在状态进行了详细的镜下径迹统计,以揭示铀元素在地幔岩中的种种存在状态和分布规律。在此基础上进一步把铀作为不相容元素群的示踪剂(tracer),指示地幔流体在深部地幔岩中的活动轨迹。结果表明,地幔流体能够渗透到各造岩矿物颗粒间隙、浆胞、蚀变边和晶体内部超微裂隙之中(此裂隙宽度很小,约为0.00 n~0.0 n mm)。地幔流体残渣呈极易浸出的非矿物形式的烃碱性物质吸附在超微裂隙之中(浸泡液pH>10)。通过浸泡结果能够大体窥知当初地幔流体的可能地球化学成分。 相似文献
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A second order atmospheric drag theory based on the usage of TD88 model is constructed. It is developed to the second order
in terms of TD88 small parameters K
n,j
. The short periodic perturbations, of all orbital elements, are evaluated. The secular perturbations of the semi-major axis
and of the eccentricity are obtained. The theory is applied to determine the lifetime of the satellites ROHINI (1980 62A),
and to predict the lifetime of the microsatellite MIMOSA. The secular perturbations of the nodal longitude and of the argument
of perigee due to the Earth’s gravity are taken into account up to the second order in Earth’s oblateness. 相似文献
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To explore the impact of temperature difference (TD) on the disintegration of redbed softrock, three types of redbed rock, collected from Nanxiong Basin, were analyzed under three different treatments: TD, wetting and drying (WD), and TDWD-temperature difference and WD. To better understand the influence of different ranges of TD on disintegration during WD cycles, pH (hydrogen ion concentration) values, electrical conductivity (EC) values, and concentration of cations in leachate released during treatment were measured. The results show that no significant change can be observed under single TD treatment but that TD can increase the disintegration rate by accelerating the water–rock interaction. The effect of TD is more significant for rock with weak resistance to disintegration. 相似文献
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Paul A. Boley rey M. Sobolev Vadim V. Krushinsky Roy van Boekel Thomas Henning Aleksei V. Moiseev Maksim V. Yushkin 《Monthly notices of the Royal Astronomical Society》2009,399(2):778-782
The intent of this study is to determine the nature of the star and associated nebulosity S 235 B, which are located in a region of active star formation still heavily obscured by the parent molecular cloud. Low-resolution ( R = 400) long-slit spectra of the star and nebulosity, and medium- ( R = 1800) and high-resolution ( R = 60 000) spectra of the central star are presented along with the results of Fabry–Perot interferometric imaging of the entire region. Based on the long-slit and Fabry–Perot observations, the nebulosity appears to be entirely reflective in nature, with the stellar component S 235 B★ providing most of the illuminating flux. The stellar source itself is classified here as a B1V star, with emission-line profiles indicative of an accretion disc. S 235 B★ thus belongs to the relatively rare class of early-type Hebrig Be stars. Based on the intensity of the reflected component, it is concluded that the accretion disc must be viewed nearly edge-on. Estimates of the accretion rate of S 235 B★ from the width of the Hα profile at 10 per cent of maximum intensity, a method which has been used lately for T Tauri stars and Brown Dwarfs, appear to be inconsistent with the mass outflow rate and accretion rate implied from previous infrared observations by Felli et al., suggesting this empirical law does not extend to higher masses. 相似文献
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本文对选用低能γ射线测定铀矿中的~(235)U、~(238)U、~(226)Ra、~(232)Th含量进行了讨论,提出了一种对样品进行自吸收校正的简单准确方法,对铀矿样中的~(235)U、~(238)U、或~(235)U/~(238)U比值测定获得了较高的分析精度和准确度。 相似文献