中国科学院机构知识库网格系统: 检索

Research on the distribution characteristics of a novel oil displacement system for conformance control in microporous media 期刊论文 OAI收割
FUEL, 2025, 卷号: 396, 页码: 15
作者: Sun, Zhe; Wang, Xiujun; Shen WJ(沈伟军)

|

收藏 | 浏览/下载：6/0 | 提交时间：2025/06/23

A novel hydrogel system Conformance control technology Seepage behavior Spatial distribution characteristics Mechanism analysis

黑珠芽薯蓣（Dioscorea melanophyma）营养价值评估及繁殖体系初探 学位论文 OAI收割
: 中国科学院大学, 2022
作者: 陈直

|

收藏 | 浏览/下载：17/0 | 提交时间：2024/05/14

薯蓣，新型食品，珠芽，繁殖技术，寄生虫 Dioscoreaceae, Novel food, Bulbil, Propagation technology, Parasite

Development trend and prospect of solid phase extraction technology 期刊论文 OAI收割
CHINESE JOURNAL OF CHEMICAL ENGINEERING, 2022, 卷号: 42, 页码: 245-255
作者: Zhang, Chao; Xing, Huifang; Yang, Liangrong; Fei, Pengfei; Liu, Huizhou

|

收藏 | 浏览/下载：31/0 | 提交时间：2022/06/15

Solid phase extraction Papers output scale Quality of research Novel technology

Design and image restoration research of a cubic-phase-plate system (EI CONFERENCE) 会议论文 OAI收割
5th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Advanced Optical Manufacturing Technologies, April 26, 2010 - April 29, 2010, Dalian, China
作者: Zhang J.; Zhang J.; Zhang J.; Shi G.; Zhang X.

收藏 | 浏览/下载：29/0 | 提交时间：2013/03/25

Wave-front coding technology is a novel jointly optical and digital imaging technology which can greatly extend the depth of focus of optical systems. The image restoration process is an important part of wave-front coding technology. Using wave-front coding makes the modulation transfer function(MTF) values of the optical systems change little over a range of several times the depth of focus which means the system MTF is quite insensitive to defocus and there is no zero in the passband. So we can design a single filter for the restoration of images in different defocus positions. However it's hard to avoid noise during image acquisition and transmission processes. These noises will be amplified in the image restoration especially in the high frequency part when the MTF drop is relatively low. The restoration process significantly reduces the system signal to noise ratio this way. Aimed at the problem of noise amplification a new algorithm was proposed which incorporated wavelet denoising into the iterative steps of Lucy-Richardson algorithm. Better restoration results were obtained through the new algorithm effectively solving the noise amplification problem of original LR algorithm. Two sets of identical triplet imaging systems were designed in one of which the cubic-phase-plate was added. Imaging experiments of the manufactured systems were carried and the images of a traditional system and a wave-front coded system before and after decoding were compared. The results show that the designed wave-front coded system can extend the depth of focus by 40 times compared with the traditional system while maintaining the light flux and the image plane resolution. 2010 Copyright SPIE - The International Society for Optical Engineering.

The novel facet coating technology for 808nm semiconductor laser (EI CONFERENCE) 会议论文 OAI收割
2010 Academic Symposium on Optoelectronics and Microelectronics Technology and 10th Chinese-Russian Symposium on Laser Physics and Laser Technology, RCSLPLT/ASOT 2010, July 28, 2010 - August 1, 2010, Harbin, China
作者: Liu Y.; Qin L.; Li Z.; Li Z.; Wang L.

收藏 | 浏览/下载：26/0 | 提交时间：2013/03/25

A novel facet coating technology is presented by studying catastrophic optical mirror damage mechanism of semiconductor laser. In this technology semiconductor laser are cleaved in the air and the surface oxide layer is removed with a low energy ion source flowed immediately by coating the facet with thin ZnSe layer of 20 nm. The function of this layer is to protect semiconductor laser facet and prevent impurity particles diffusing to the facet. Finally the facet is coated with oxidative optical film. The test results show that the output power of the semiconductor laser with the ZnSe coated layer is 13% higher than that of the Si coated layer and 47% higher than that of the oxide coated film. The device coated oxide film is damaged when current is 4.5 A and the device coated with Si layer is damaged when current is 5.5 A the final failed device is coated with ZnSe layer. In conclusion the method of coating ZnSe layer on the semiconductor laser facet can prevent effectively the catastrophic optical mirror damage and increase the output power of semiconductor lasers. 2010 IEEE.

Manufacture of 1.2m reaction bonded silicon carbide mirror blank CFID (EI CONFERENCE) 会议论文 OAI收割
5th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Large Mirrors and Telescopes, April 26, 2010 - April 29, 2010, Dalian, China
作者: Zhang G.; Zhang G.; Zhang G.

收藏 | 浏览/下载：34/0 | 提交时间：2013/03/25

Silicon carbide (SiC) is a new type candidate material for large-scale lightweight space mirror. Its low thermal distortion high stiffness fine optical quality and dimensional stability make SiC an ideal material for large space born telescope. Since ten years Changchun institute optics fine mechanics and physics (CIOMP) has developed reaction bonded SiC (RB-SiC) technology for space application and can fabricate RB-SiC mirror with scale less than 1.0 meter for telescope. The green body is prepared with gel-casting method which is an attractive new ceramic forming process for making high-quality complex-shaped ceramic parts. And then unmolding drying binder burning out reacting bonded the RB-SiC can be obtained. But with the development of space-born or ground telescope the scale of primary mirror has exceeded 1.0 meter. So CIOMP has developed an assembly technique which called novel reaction-formed joint technology for larger RB-SiC mirror blank. The steps include joining of green bodies with mixture comprised of SiC particles and phenolic resin etc firing machining and sintering. Joining the 1.2 meter RB-SiC mirror blank by the novel reaction-formed joint technology. And testing the welding layer's performance the results show that the thickness of 54-77m the microstructure and thermal property can be comparable to the substrate and the mechanical property are excellent in bending strength of 307MPa. 2010 Copyright SPIE - The International Society for Optical Engineering.

An 8-channel, area-efficient, low-power audio sampling rate converter (EI CONFERENCE) 会议论文 OAI收割
9th International Conference on Electronic Measurement and Instruments, ICEMI 2009, August 16, 2009 - August 19, 2009, Beijing, China
作者: Liu Y.; Liu Y.; Liu Y.; Wang D.

收藏 | 浏览/下载：30/0 | 提交时间：2013/03/25

A novel 8-channle third area-efficient next a new Timing Division Multiplexer (TMD) scheme lowers clock working rate to minimum in order to save power a novel memory addressing scheme reduces 20% data memory at least. Experiments show proposed methods could not only saved hardware resources but also reduce power consumption low-power audio sampling rate converter is proposed in this paper so it is very suitable for consumer electronics. 2009 IEEE. conversion ratio is 2:1 and 4:1. Filter design and implementation are the key points for the converter. First excluded data and coefficients memories adopting multiplier-free Arithmetic Unit (AU) and rounding methods allows its realization in a cell area of only 0.038mm 2 in 0.18 m technology

A multi-channel, area-efficient, audio sampling rate interpolator (EI CONFERENCE) 会议论文 OAI收割
2009 8th IEEE International Conference on ASIC, ASICON 2009, October 20, 2009 - October 23, 2009, Changsha, China
作者: Wang D.

收藏 | 浏览/下载：31/0 | 提交时间：2013/03/25

The area and power consumption of sampled rate converter are governed largely by associated digital interpolationfilters. This paper presents a novel multi-channel area-efficient audio sampling rate interpolator whose conversion ratio is 1:2 and 1:4. Several architectural and implementation features reduces the complexity of the filter and allow its realization in a die area of 0.032mm2 in 0.18 m technology meanwhile timing multiplexer scheme reduces clock frequency to minimum. Experiments show proposed methods could not only saved hardware resources but also reduce power consumption so it is very suitable for consumer electronics. 2009 IEEE.

Study of microsphere plate photomultiplier tube (EI CONFERENCE) 会议论文 OAI收割
ICO20: Remote Sensing and Infrared Devices and Systems, August 21, 2005 - August 26, 2005, Changchun, China
作者: Wang X.; Li Y.; Li Y.; Li Y.; Li Y.

收藏 | 浏览/下载：35/0 | 提交时间：2013/03/25

The photomultiplier tube (PMT) that can work in different wavelength is an important detector device in remote sense technology. Microsphere plate using glass beads 50to 70m in diameter sintered together is the core component of the microsphere plate photomultiplier tube It is a novel two-dimension electron multiplier. The electrons gain for a single plate is about 1017 and do not have the phenomenon of ion-feedback. Furthermore the fabrication process is very easy. In this paper much interest was put on the microsphere plate photomultiplier tube. Based on the analyses from the theory and the experiment result we point out the key technology for fabricating PMT is how to obtain glass beads with narrow range in diameter and how to sinter the glass beads with a sufficient pylome. Factors affect the gradating technology and sintering process along with the solution to them is presented. In the last the structure scheme and technological characteristic for fabricating microsphere plate photomultiplier tube were given. The pulse rising-time of MSP-PMT is below 400ps suitable to the detection of high-speed pulse. As easy to be fabricated and has great advantage over MCP multiplier in the ratio of performance to price the microsphere plate photomultiplier tube is a promising dim-light detector.

Novel resistance iterative algorithm for CCOS (EI CONFERENCE) 会议论文 OAI收割
Current Developments in Lens Design and Optical Engineering VII, August 14, 2006 - August 15, 2006, San Diego, CA, United states
作者: Zhang X.; Zhang X.; Zhang X.

收藏 | 浏览/下载：66/0 | 提交时间：2013/03/25

CCOS (Computer Control Optical Surfacing) technology is widely used for making aspheric mirrors. For most manufacturers dwell time algorithm is usually employed to determine the route and dwell time of the small tools to converge the errors. In this article a novel damp iterative algorithm is proposed. We chose revolutions of the small tool instead of dwell time to determine fabrication stratagem. By using resistance iterative algorithm we can solve these revolutions. Several mirrors have been manufactured by this method all of them have fulfilled the demand of the designers a 1m aspheric mirror was finished within 3 months.