ET-98无机磷酸盐富锌涂料的性能与应用

论述了国内首创的ET-98无机磷酸盐富锌涂料，该涂料克服了无机磷酸富锌涂料、无机富锌涂料喷砂、抛丸的缺点，简易可行，除锈、除油后即可涂刷，并能达到较好的防腐效果。     

基于人工神经网络的铝熔体中氢的预测

用HyscanⅡ型测氢仪测定了铝熔体在不同温度和保温时间下的氢含量 ,通过对BP人工神经网络的分析和改进 ,采用了结构为 2 4 2 1的BP神经网络模型 ,用所获得的试验数据对其进行训练和测试 ,当BP神经网络经过 3× 10 5次学习后 ,最大训练误差 (MaxTrainingError)和训练均方差 (RMSTrainingError)分别为 0 .5 5 %和 0 .18% ,同时相应的最大测试误差 (MaxTestError)和测试均方差 (RMSTestTraining)分别达到了 0 .72 %和 0 .3 3 % ,对铝熔体中氢的预测达到了很高的精度 ,从而建立了熔炼条件 (温度、保温时间 )和氢含量的映射模型     

PREPARATION AND CRYSTALLINE MICROSTRUCTURE OF RAPIDLY SOLIDIFIED NEW AMORPHOUS Al－Fe－V－Si－Mm ALLOY

ＰＲＥＰＡＲＡＴＩＯＮＡＮＤＣＲＹＳＴＡＬＬＩＮＥＭＩＣＲＯＳＴＲＵＣＴＵＲＥＯＦＲＡＰＩＤＬＹＳＯＬＩＤＩＦＩＥＤＮＥＷＡＭＯＲＰＨＯＵＳＡｌ－Ｆｅ－Ｖ－Ｓｉ－ＭｍＡＬＬＯＹＷａｎｇＪｉａｎｑｉａｎｇ；ＧｕＴａｏ；ＺｅｎｇＭｅｉｇｕａｎｇ；Ｃｈｅｎ...     

压铸条件下过共晶铝硅合金P变质的必要性

在铝合金压铸生产过程中,Al-P中间合金变质处理和压力铸造工艺都能够使过共晶铝硅合金中的初晶硅晶粒细化.探讨Al-P中间合金变质处理,分别在压铸工艺条件下和普通金属型条件下,对过共晶Al-15Si合金组织的不同影响.试验表明,压铸条件下未经Al-P变质的和经Al-P变质的Al-15Si合金与金属型条件下未经Al-P变质的Al-15Si相比,初晶Si尺寸分别减小50%和75%左右;在相同的压铸工艺条件下,Al-P变质后Al-15Si合金初晶Si尺寸,比未经过Al-P变质的Al-15Si合金初晶Si尺寸减小40%左右.论证了在Al-Si系过共晶铝合金压铸件生产过程中,Al-P中间合金进行变质处理的必要性.     

Effect of copper addition on the thermal contraction of indium melt clusters

The structure of In-1%Cu and In-5%Cu (mass fraction) alloy melts were studied at different temperatures above liquidus by using a high-temperature X-ray diffractometer and were compared with that of pure In melt. Experimental results show that with the addition of 1% Cu or 5% Cu, the thermal contraction phenomenon of atom clusters occurs in melts with the temperature increasing like pure In melt. With the addition of 1% Cu, the thermal contraction of atom clusters increases and the contraction is not homogeneous in the whole measurement temperature range. The sudden change and noticeable contraction can be found in the range of 280-390℃. The temperature range of the sudden change is lower than that of pure In melt. With the addition of 5% Cu, the thermal contraction of atom clusters decreases and the contraction is not consistent in the whole measurement temperature range. The anomalous change can be measured at about 600 ℃. At the same superheating temperature, the nearest interatomic distance r1 of     

低合金奥-贝球铁电弧焊焊条的研究

本文通过等温热处理系统地研究了Ｃｕ，Ｎｉ，Ｍｏ对球铁焊缝金属等温转变，奥－贝化能力及机械性能的影响，并利用Ｘ射线衍射仪，扫描电镜，透射电镜研究了低合金奥－贝球铁焊缝的基体结构，分析讨论了基强韧化机制。在此基础上首次研制成功了Ｎｉ－Ｍｏ低合金奥－贝球铁新焊条，与非合金化奥－贝球铁焊条相比，焊缝金属的奥－贝化能力提高２．５倍，其焊缝与焊接接头的机械性能均满足奥－贝球铁的要求。     

Al-P中间合金在Al-Si活塞合金中的应用

在实验室和生产条件下研究了Al-P中间合金对共金和过共晶Al-Si活塞合金的变质工艺特点，变质效果和力学性能等的影响，结果表明：使用Al-P中间合金操作简单，变质效果好且稳定，力学性能也比其他变质剂有不同程度的提高；使用该中间合金无渣，无污染，从时间上看可以完全省去变质处理过程，节约能源，提高合金的实收率，降低铝耗，有着良好的应用前景。     

Design and fabrication of a resonant pressure sensor by combination of DETF quartz resonator and silicon diaphragm

A new type of resonant pressure sensor is presented which is realized by combination of a double-ended tuning fork (DETF) quartz resonator and a silicon diaphragm. To examine the feasibility and investigate the performance of this innovation, theoretical analysis and finite elements method are employed to optimize the structure parameters. Micromachining technology are involved in the fabrication of the silicon diaphragm and the DETF quartz resonator, which are fabricated separately and bounded together afterwards. Performances of the sensor prototypes are experimentally investigated. Preliminary testing results demonstrate that the sensor features a high sensitivity of approximately 452.5 Hz/kPa in the operating range of 0–6 kPa at room temperature, with a non-linearity <0.035 % FS and a hysteresis of 0.055 % FS. In addition, the maximum zero-drift is about 0.5 Hz/h which reveals favorable frequency stability. Thus, the feasibility of this scheme is verified. Due to the excellent performances such as high accuracy, high sensitivity, low cost and simple fabrication, this novel resonant sensor provides a commendable solution for low pressure measurement.     

与抽样相结合的县级作物遥感面积估算应用实例

为了探索遥感卫星影像和无人机调查在实际遥感面积估算中的调查效果和适用性,以广东省阳春市晚稻为例,采用卫星影像与无人机调查结果相结合,使用两种面积估算方法进行2013年晚稻种植面积估算。实验结果表明,比估计和回归估计方法的估算结果分别为22 501.1hm2和22 781.1hm2,二者的CV分别为8.84%和1.03%。研究结果表明:1无人机调查可获得高质量的面积测量信息;2优化后的样本能够支持面积估算过程,但其理论意义需要更进一步地讨论与证明;3卫星数据与无人机调查数据相结合的方法可以提供满足统计精度要求的面积测量结果,具有良好的应用前景。     

西南地区不同山地环境梯度叶面积指数遥感反演

叶面积指数(LAI)遥感估算是植被定量遥感研究的热点之一,监测植被LAI时空变化对于研究陆地生态系统碳循环及全球变化等具有非常重要的意义。在我国西南山区设置10个50km×50km的观测样区作为研究区,其中包括5个森林生态系统样区、3个农田生态系统样区和2个草地生态系统样区。分别获取不同优势植被类型LAI地面实测数据,结合同期获取的遥感数据,考虑地形因素影响,基于偏最小二乘原理分别构建各样区LAI遥感估算模型,并采用交叉验证的方式对模型精度进行评价。结果表明:考虑了海拔、坡度和坡向等地形因子的森林LAI遥感反演模型与未考虑地形变量的模型相比,其验证精度有所提高,R2由0.30~0.75提高至0.50~0.80,RMSE由0.52~0.93m2/m2降低至0.48~0.89m2/m2;所有样区优势植被类型LAI反演模型验证R2在0.40~0.80之间,RMSE在0.22~0.89m2/m2之间。发展的LAI遥感估算方法有助于认知山地植被LAI反演的地形效应问题,可为进一步的山地植被长势监测提供科学依据。