共查询到19条相似文献,搜索用时 125 毫秒
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《中国新技术新产品》2015,(14)
本文研究了采用无刷直流电机作为洗衣机驱动电机,以瑞萨R8C/25系列的R5F21258SNFP作为主控芯片设计了无刷直流调速控制系统,本文对硬件电路和软件设计进行了介绍。系统结构简单,运行可靠,效果良好。 相似文献
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目前染印法无银声带“染料声带”质量不高的原因之一是,染料普鲁士蓝在800μm 左右的红外光处阻光效果较差。本文试用还原法研制留银声带,以改进染料声带的光谱特性曲线在约700μm 以后明显下降的缺点。此法一个重要特点是,使用无银空白片经过还原法留银,最后得到的是一个光谱特征曲线好的银质声带。由于声带留银部分仅占整个胶片(35mm)的3~5%。这样既提高了无银声带的质量,又可使空白片的白银大约节省95%以上。本法的主要化学反应式可表示为:Re~-+Ag~+■Ag■ Re~-代表还原剂 Ag~+代表银盐 Ag■代表金属银 相似文献
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我们在《智能量块检定仪》课题研究中。应用到MCS-48系列单片机.发现该系列单片机无减法指令。而在编程运算中,常常遇到被减数小于减数时,便无法运算。对此,本文研制了无符号减法代数运算程序及通则.有效地扩充了MCS-48系列单片机的运算功能.并应用到实际工作当中,本程序具有很强的实用性和通用性。 相似文献
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正2008年,松下推出了世界上第一款无反数码相机Lumix G1,从此开创了数码相机的新纪元。如今,几乎所有的相机厂家都推出了无反相机产品,并与数码单反相机形成了分庭抗礼之势。作为无反相机的创立者,松下在这10年间也推出了多款产品,其GH系列已经成为视频拍摄领域最火爆的数码相机产品系列之一。不过,在照片拍摄领域,松下还缺少一款过硬的产品,Lumix G9由此应运而生。 相似文献
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酸性光亮镀铜溶液的性能与温度的关系很大,温度影响着Cu2++Cu=2Cu+的平衡,Cu2+和Cu2+析出电位相同时镀液性能最好。根据热力学数据、平衡常数与温度的关系等,从析出电位角度推导出了酸性镀铜溶液最高允许的温度范围。指出从理论上讲,酸性镀铜溶液所允许的温度范围为11.0—40.2℃,实际生产时,酸性镀铜溶液所允许... 相似文献
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为研究不同研磨珠直径对镀层细化及性能的影响,在硫酸盐酸性镀铜溶液中添加玻璃珠,玻璃珠的运动对A3钢表面产生机械研磨作用(MA),并采用扫描电镜、显微硬度测试仪、电化学工作站等方法对其进行观察和分析.结果表明:与传统硫酸盐酸性镀铜层相比,机械研磨镀铜层的膜厚和孔隙率降低,硬度、耐蚀性、防渗碳性能提高;机械研磨镀铜层的晶粒尺寸大小随着研磨直径的增大先减小后增大;当研磨珠直径为8 mm时,镀层的晶粒尺寸小于2μm,硬度达到168.3 HV,孔隙率为0.6个/cm~2,渗碳层的厚度为40μm. 相似文献
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Sludges generated from electroplating wastewaters contain high concentrations of metals. Studies have confirmed that the concentrations
of several metals in the sludge exceed that of those found in natural ores. A very good example is in the case of copper.
The natural copper ore contains less than 1% of copper, whereas copper precipitate sludges from the electroplating industry
may have an average of 5–10% of copper. Thus, they are one of the largest sources of untapped metal-bearing secondary materials
amenable to metals recovery. In Malaysia, most of these metal-bearing sludges are disposed in specially engineering landfills,
as many of them do not have the proper incentives and recovery technology. Very less metal recovery is being carried out,
and there seems to be a huge waste in these valuable metal resources. With regards to that, an experimental study was carried
out to develop and optimise a method of copper recovery from metal hydroxide sludges. Sludge samples containing high concentrations
of copper were obtained from a local electroplating plant for the study. A procedure based upon mineral acid leaching or solubilisation
was carried out. Two different types of acids, hydrochloric acid (HCl) and sulphuric acid (H2SO4) were used to compare the extractability of copper. Experiments were conducted at various acid concentrations and temperatures
to determine the maximum amount of copper recoverable. From the results obtained, maximum copper (95%) was solubilised using
H2SO4 of 10 M at temperature 110°C, for a leaching period of 4 h. These copper concentrated solutions were then heated and crystallised
to form CuSO4 crystals. These crystals were then washed with water and purified. They can be then further treated and reutilised in the
metallurgical industry. This study introduces a sustainable method of utilising an electroplating sludge containing valuable
metals. 相似文献