高精度30kV高压稳压电源的研制

本文介绍了为新型电子束曝光机研制的高精度30kV高压稳压电源。该电源采用双闭环调整,集中补偿和分散补偿相结合的设计方案。对电源的关键性技术采取了有力措施,使各项技术指标均达到设计要求。     

采用高精度雷管的微差爆破实践

简单介绍了微差爆破的原理,阐述了高精度雷管的性能,并与普通雷管进行了延期时间与误差比较。在兰尖铁矿用高精度雷管进行了孔内孔间微差爆破试验,爆破震动测试数据表明,在露天矿采场生产爆破中,使用高精度雷管进行孔内孔间微差爆破,能取得好的降震效果和爆破质量。     

高精度磁法用于硐室爆破盲炮检测的可行性探讨

在工程爆破实践中,盲炮产生后未爆炸的炸药在地下要占据一定的空间,硐室爆破盲炮检测可归结为探测在地下一定范围内硐室爆破盲炮点物理性质异常的问题。高精度磁法即在硐室内预置磁性体建立物理场源,炸药爆炸后磁性体被破坏,物理场源消失。理论上,通过对比硐室爆破前后地面磁场的变化,可实现硐室爆破盲炮的检测。现场试验研究表明,在现有技术与经济条件下,高精度磁法用于硐室爆破盲炮检测依旧是个难题。     

便携式温场测量仪的设计与实现

温场测量是应用非常广泛的物理量测量方法。文章介绍了一种测量精度比较高的温场测量仪器的硬件设计和软件实现。阐述了温度从采集到测量、处理的各个环节;分析了影响仪器测量精度的各种因素,介绍了从软硬件方面进行处理,提高测量精度的方法。     

黟县胡家门地区锡多金属矿地质特征与成矿条件

黟县胡家门地区位于安徽省南部,区内锡多金属矿位于“江南古陆”北东段北缘。对区内锡多金属矿区进行了高精度磁法测量和1∶10 000土壤地球化学测量,测量数据反演计算结果表明：①区内异常分为北、中、南（M-1#、M-2#,M-3#）等3个区,北区以低缓磁异常分布为特征,强度均在50 nT以下,中区以强度高（多大于100 nT）、异常相连分布为特征,南区以中等强度异常分散分布为特征,根据异常分布形态、强度及地质特征,推测存在2条隐伏断层和2个隐伏岩体。②区内微量元素分布特征与地质背景密切相关,区内北部Sn含量明显高于南部,Sn含量高值分布区域与花岗岩类岩体（M-1#异常区）基本一致,区内共圈定了7处锡异常,锡矿找矿潜力巨大。在上述分析的基础上,进一步讨论认为区内岩石越破碎,含量矿性越好,W、Mo、Sn含量从岩体内部向接触带有逐渐升高的现象,区内地处江南过渡带“菱形”格局的北东交汇部位,成矿条件有利,寻找到类似祁门东源的斑岩型钨钼矿的可能性较大。     

多不杂斑岩型铜金多金属矿床综合地球物理场特征

通过介绍激电中梯法和高精度磁测法在多不杂矿段的找矿实践,分析和总结了矿区内地球物理场特征与矿体之间的关系。结果表明,在矿体附近激电异常特征表现为低视电阻率和高极化率,并且随着矿物中金属硫化物含量的增加,极化率也增高;矿体上高精度磁测异常特征表现为低磁正异常。总体来看,矿区内物探异常围绕花岗岩岩体及接触带附近分布,套合良好,真实反映了含矿花岗闪长斑岩体及矿化蚀变分布范围,为今后多龙矿区内寻找铜金矿床提供了地球物理场特征。     

新型高精密真空扩散焊炉的研制及应用

本文介绍了新型高精密真空扩散焊炉的工艺原理及技术特点,并以一台已经研制成功的新型高精密真空扩散焊炉为例,详细阐述了该设备的相关设计思路及特点.该设备采用伺服电机拖动丝杠加压技术,并通过闭环控制实现了工艺过程的自动控制,具有压力精度高、控制灵活、生产效率高、清洁可靠等优点.     

Mechanism of Cf/SiC hole making with high shape precision using abrasive waterjet based on response surface method

This paper aims to explore the accurate control of hole shape for AWJ hole-making of C_f/SiC based on experimental and mathematical analysis methods, and the influence mechanism involved is emphatically analyzed. The results reveal that D_difference is most influenced by the standoff distance, followed by the traverse speed, while it is less influenced by the pressure and the abrasive flow rate. The traverse speed, pressure and abrasive flow rate affect the D_difference by changing the total energy of the jet; while the standoff distance mainly affects the D_difference by changing the effective impact area, which is fundamentally different from other process parameters. In terms of interaction effects, decreasing the traverse speed and increasing the waterjet pressure can amplify the effect of interaction with the involvement of the standoff distance on the D_difference. Based on the established D_difference model and D_offset model, a control method that can gain acquired hole shape is finally obtained for selecting the process parameters of AWJ machining.     

Development of High Accurate Family-use Digital Refractometer Based on CMOS

This study aims to develop a low-cost refractometer for measuring the sucrose content of fruit juice, which is an important factor affecting human health. While laboratory-grade refractometers are expensive and unsuitable for personal use, existing low-cost commercial options lack stability and accuracy. To address this gap, we propose a refractometer that replaces the expensive CCD sensor and light source with a conventional LED and a reasonably priced CMOS sensor. By analyzing the output waveform pattern of the CMOS sensor, we achieve high precision with a personal-use-appropriate accuracy of 0.1%. We tested the proposed refractometer by conducting 100 repeated measurements on various fruit juice samples, and the results demonstrate its reliability and consistency. Running on a 48 MHz ARM processor, the algorithm can acquire data within 0.2 seconds. Our low-cost refractometer is suitable for personal health management and small-scale production, providing an affordable and reliable method for measuring sucrose concentration in fruit juice. It improves upon the existing low-cost options by offering better stability and accuracy. This accessible tool has potential applications in optimizing the sucrose content of fruit juice for better health and quality control.