手机move the telephone夏普D4手机笔记本D4是夏普在近期推出的一款超强的智能移动终端设备,在日本市场率先上市。标准笔记本配置,有1GB的内存和40GB的硬盘。身为手机的身份,D4的显示屏只能控制在5英寸水平,不过分辨率却达到了惊人的102...手机move the telephone夏普D4手机笔记本D4是夏普在近期推出的一款超强的智能移动终端设备,在日本市场率先上市。标准笔记本配置,有1GB的内存和40GB的硬盘。身为手机的身份,D4的显示屏只能控制在5英寸水平,不过分辨率却达到了惊人的1024×600像素,现在主流的12英寸笔记本显示屏分辨率仍然是1024×768像素,D4的显示效果可想而知。在展开之后整款机器可以形成一款有模有样的小型笔记本电脑,机器内置了200万像素摄像头。夏普已经宣布了将在奥运之前进入国内市场。展开更多
High-speed vehicle dynamic envelope curve is defined as the maximum limit outline affected by a variety of adverse factors while the train is running. Considering the difficulties in the current measurement system suc...High-speed vehicle dynamic envelope curve is defined as the maximum limit outline affected by a variety of adverse factors while the train is running. Considering the difficulties in the current measurement system such as complicated calibration process,cumbersome aided-instruments,strict limitation of working distance, this paper carries out an optical method in which two high-speed cameras with variable-zoom lenses are adopted as binocular stereo sensors of measurement system and a high-ac-curacy 3D target with fast reconstruction is designed. The intrinsic parameters of the sensors and the relative positions between coordinate systems are solved by the method of colinearity constrained optimization algorithm. The calibration process is easy to operate and the device is also of portability. Most importantly, the severe working distance limitation between sensors and measured body is solved, enhancing the adaptability of measurement system to environment. Experimental results show that when the sensors are in the range of 8 -16 m away from the measured body, system accuracy can reach up to ±0. 5 mm, which meets the requirements to measure the dynamic envelope curve of high-speed vehicle.展开更多
A liquid deformable mirror, which can provide a large stroke deflection more than 100 μm, is proposed for focus control. The deformable mirror utilizes the concept of magnetic fluid deformation shaped with electromag...A liquid deformable mirror, which can provide a large stroke deflection more than 100 μm, is proposed for focus control. The deformable mirror utilizes the concept of magnetic fluid deformation shaped with electromagnetic fields to achieve concave or convex surface and to change the optical focus depth of the mirrors. The free surface of the magnetic fluid is coated with a thin layer of metal-liquid-like film(MELLF) prepared from densely packed silver nanoparticles to enhance the reflectance of the deformable mirror. The experimental results on the fabricated prototype magnetic fluid deformable mirror(MFDM) show that the desired concave/convex surface shape can be controlled precisely with a closed-loop adaptive optical system.展开更多
文摘手机move the telephone夏普D4手机笔记本D4是夏普在近期推出的一款超强的智能移动终端设备,在日本市场率先上市。标准笔记本配置,有1GB的内存和40GB的硬盘。身为手机的身份,D4的显示屏只能控制在5英寸水平,不过分辨率却达到了惊人的1024×600像素,现在主流的12英寸笔记本显示屏分辨率仍然是1024×768像素,D4的显示效果可想而知。在展开之后整款机器可以形成一款有模有样的小型笔记本电脑,机器内置了200万像素摄像头。夏普已经宣布了将在奥运之前进入国内市场。
基金National Science and Technology Major Project(No.2016ZX04003001)
文摘High-speed vehicle dynamic envelope curve is defined as the maximum limit outline affected by a variety of adverse factors while the train is running. Considering the difficulties in the current measurement system such as complicated calibration process,cumbersome aided-instruments,strict limitation of working distance, this paper carries out an optical method in which two high-speed cameras with variable-zoom lenses are adopted as binocular stereo sensors of measurement system and a high-ac-curacy 3D target with fast reconstruction is designed. The intrinsic parameters of the sensors and the relative positions between coordinate systems are solved by the method of colinearity constrained optimization algorithm. The calibration process is easy to operate and the device is also of portability. Most importantly, the severe working distance limitation between sensors and measured body is solved, enhancing the adaptability of measurement system to environment. Experimental results show that when the sensors are in the range of 8 -16 m away from the measured body, system accuracy can reach up to ±0. 5 mm, which meets the requirements to measure the dynamic envelope curve of high-speed vehicle.
基金supported by Shanghai Municipal Natural Science Foundation(No.15ZR1415800)the Innovation Program of Shanghai Municipal Education Commission(No.14ZZ092)the Scientific Research Foundation for the Returned Overseas Chinese Scholars
文摘A liquid deformable mirror, which can provide a large stroke deflection more than 100 μm, is proposed for focus control. The deformable mirror utilizes the concept of magnetic fluid deformation shaped with electromagnetic fields to achieve concave or convex surface and to change the optical focus depth of the mirrors. The free surface of the magnetic fluid is coated with a thin layer of metal-liquid-like film(MELLF) prepared from densely packed silver nanoparticles to enhance the reflectance of the deformable mirror. The experimental results on the fabricated prototype magnetic fluid deformable mirror(MFDM) show that the desired concave/convex surface shape can be controlled precisely with a closed-loop adaptive optical system.
