检索结果-内蒙古大学图书馆

Improving the resolution temporal in quantum and classical imaging

Chinese Optics Letters 2018年第9期16卷 70-76页

作者： Junheng Shi Giuseppe Patera Youzhen Gui Mikhail I.Kolobov Dmitri B.Horoshko and Shensheng Han Key Laboratory for Quantum Optics Shanghai Institute of Optics and Fine MechanicsChinese Academy of SciencesShanghai 201800China University of Chinese Academy of Sciences Beijing 100049Chin Univ.Lille CNRSUMR 8523-PhLAM-Physique des Lasers Atomes et MoleulesF-59000 LilleFrance B I.Stepanov Institute of Physics NASBMinsk 220072Belarus

The point-spread function of an optical system determines its optical resolution for both spatial and temporal imaging. For spatial imaging, it is given by a Fourier transform of the pupil function of the system. For temporal imaging based on nonlinear optical processes, such as sum-frequency generation or four-wave mixing, the pointspread function is related to the waveform of the pump wave by a nonlinear transformation. We compare the point-spread functions of three temporal imaging schemes： sum-frequency generation, co-propagating four-wave mixing, and counter-propagating four-wave mixing, and demonstrate that the last scheme provides the best temporal resolution. Our results are valid for both quantum and classical temporal imaging.

关键词： Improving the resolution in quantum and classical temporal imaging

来源：评论

学校读者我要写书评

暂无评论

MALDI-TOF mass spectrometry provides high accuracy in identification of Salmonella at species level but is limited to type or subtype Salmonella serovars

引用

EUROPEAN JOURNAL OF MASS SPECTROMETRY 2017年第2期23卷 70-82页

作者： Kang, Lin Li, Nan Li, Ping Zhou, Yang Gao, Shan Gao, Hongwei Xin, Wenwen Wang, Jinglin Acad Mil Med Sci State Key Lab Pathogen & Biosecur Beijing Peoples R China Acad Mil Med Sci Inst Mil Vet Changchun Jilin Peoples R China Anhui Med Univ Grad Coll Hefei Anhui Peoples R China

Salmonella can cause global foodborne illnesses in humans and many animals. The current diagnostic gold standard used for detecting Salmonella infection is microbiological culture followed by serological confirmation tests. However, these methods are complicated and time-consuming. Matrix-assisted laser desorption/ ionization time-of-flight mass spectrometry (MALDI-TOF MS) analysis offers some advantages in rapid identification, for example, simple and fast sample preparation, fast and automated measurement, and robust and reliable identification up to genus and species levels, possibly even to the strain level. In this study, we established a reference database for species identification using whole-cell MALDI-TOF MS;the database consisted of 12 obtained main spectra of the Salmonella culture collection strains belonged to seven serotypes. Eighty-two clinical isolates of Salmonella were identified using established database, and partial 16S rDNA gene sequencing and serological method were used as comparison. We found that MALDI-TOF mass spectrometry provided high accuracy in identification of Salmonella at species level but was limited to type or subtype Salmonella serovars. We also tried to find serovar-specific biomarkers and failed. Our study demonstrated that (a) MALDI-TOF MS was suitable for identification of Salmonella at species level with high accuracy and (b) that MALDI-TOF MS method presented in this study was not useful for serovar assignment of Salmonella currently, because of its low matching with serological method and (c) MALDI-TOF MS method presented in this study was not suitable to subtype S. typhimurium because of its low discriminatory ability.

关键词： Matrix-assisted laser desorption/ionization time-of-flight mass spectrometry database Salmonella identification subtyping

来源：评论

学校读者我要写书评

暂无评论

A 0.33 V 2.5 μW cross-point data-aware write structure, read-half-select disturb-free sub-threshold SRAM in 130 nm CMOS

引用

INTEGRATION-THE VLSI JOURNAL 2017年第Jun.期58卷 27-34页

作者： Jin, Wei He, Weifeng Jiang, Jianfei Huang, Haichao Zhao, Xuejun Sun, Yanan Chen, Xin Jing, Naifeng Shanghai Jiao Tong Univ Dept Micronano Elect Shanghai Peoples R China Tongji Univ Dept Elect Engn Shanghai Peoples R China

Conventional data-aware structure SRAMs consume unnecessary dynamic power during the read phase due to the read-half-select issue. In this paper, a 9T-based read-half-select disturb-free SRAM architecture with the cross-point data-aware write strategy is proposed. Based on the proposed write-half-select and read-half-select disturb-free strategy, our 9T bitcell structure improves the read and write SNM by 2.5X and 2.4X compared to traditional bitcells. Furthermore, the proposed strategy and 9T bitcell structure can reduce the read power dissipation on bitline of the SRAM array by 5.14X compared with traditional SRAMs. Based on the proposed architecture, a 16Kb SRAM is fabricated in a 130 nm CMOS which is fully functional from 1.2 V down to 0.33 V. The minimal energy per cycle is 11.8pJ at 0.35 V. The power consumption at 0.33 V is 2.5 mu W with 175 kHz. The proposed SRAM has 1.5X and 4.2X less total power and leakage power than other works.

关键词： SRAM Cross-point Data-aware Read-half-select Sub-threshold Ultra-low power

来源：评论

学校读者我要写书评

暂无评论

A Coherent Receiver Based on SIM for Quantum Communication

引用

IEEE PHotONICS techNOLOGY LETTERS 2018年第1期30卷 27-30页

作者： Wen, Ke Zhao, Yanli Tu, Junjie Xu, Jing Li, Yuan Huazhong Univ Sci & Technol Wuhan Natl Lab Optoelect Wuhan 430074 Hubei Peoples R China

In this letter, we propose theoretically a coherent receiver based on solid-state impact-ionization multiplier (SIM) for quantum communication. In the newly proposed coherent receiver, the balanced photodetector (BPD) is used as a current source connected to the SIM. The signal from the BPD is fed into the SIM, where it is amplified through a desirable avalanche process, which is similar to the avalanche photodiodes, and can then be fed into a transimpedance amplifier for voltage readout. Compared with the conventional coherent receiver with only coherent gain, the signal gain of the proposed coherent receiver consists of two parts, the coherent gain produced by the local oscillator (LO) and the avalanche gain produced by the SIM, so the LO power can be decreased to avoid the saturation of the BPD without sacrificing the signal gain. What is more, the proposed receiver can operate at a higher bandwidth by optimizing the structure of the coherent receiving end and redesigning the geometry of the SIM.

关键词： Coherent receiver quantum communication solid-state impact-ionization multiplier

来源：评论

学校读者我要写书评

暂无评论

用于高性能单Pd三效催化剂的复合组分Ce_xZr_(1-x)O_2材料的制备（英文）

引用

无机材料学报 2018年第7期33卷 798-804页

作者：李红梅兰丽陈山虎刘达玉王卫陈耀强成都大学药学与生物工程学院成都610106 中自环保科技股份有限公司成都611731 四川大学化学学院绿色化学与技术教育部重点实验室成都610064

用简单的顺序沉淀法制备了两种具有混合组分的CeO_2-ZrO_2材料。用X射线衍射(XRD),拉曼光谱(Raman),X射线光电子能谱(XPS),氮气吸附-脱附,氢气程序升温还原(H_2-TPR)和储氧量(OSC)研究了不同组合形式对负载的单Pd催化剂性能的影响。结... 详细信息

用简单的顺序沉淀法制备了两种具有混合组分的CeO_2-ZrO_2材料。用X射线衍射(XRD),拉曼光谱(Raman),X射线光电子能谱(XPS),氮气吸附-脱附,氢气程序升温还原(H_2-TPR)和储氧量(OSC)研究了不同组合形式对负载的单Pd催化剂性能的影响。结果表明,两个混和组分的催化剂结构和织构性能都得到了改善。由于贵金属和载体材料之间以及载体材料内部各组分之间的强相互作用,组合的结构促进了Ce^(3+)和晶格缺陷的形成,提高了氧的移动性,并且相应的催化剂老化前后对于CO、C_3H_8和NO的转化都具有较宽的窗口范围,说明这种具有混合组分的载体材料在汽油车尾气净化方面具有良好的应用前景。

关键词：复合组分结构顺序沉淀法单Pd三效催化剂催化性能

来源：评论

学校读者我要写书评

暂无评论

SeTe alloy semiconductor core optical fibers

引用

MATERIALS research BULLETIN 2018年 100卷 382-385页

作者： Huang, Kaimin Tang, Guowu Luo, Qianhang Qian, Guoquan Yang, Li Yuan, Fangqiang Shi, Zhenguo Qian, Qi Yang, Zhongmin South China Univ Technol Guangdong Engn Technol Res & Dev Ctr Special Opt State Key Lab Luminescent Mat & Devices Guangzhou 510640 Peoples R China South China Univ Technol Guangdong Prov Key Lab Fiber Laser Mat & Appl Tec Guangzhou 510640 Peoples R China

Se0.5Te0.5 semiconductor core optical fibers with phosphate glass cladding were fabricated by using a reactive molten core approach. The core was found to be amorphous with some oxygen diffusing in from the cladding glass. Crystalline Se0.5Te0.5 (c-Se0.5Te0.5) semiconductor core fibers were obtained by a post-drawing annealing process. Significant disparities in conductivity under stress and without stress were observed in c-Se0.5Te0.5 semiconductor core fibers. To the best of our knowledge, this is the first time that stress sensing can be realized in c-Se0.5Te0.5 semiconductor core optical fibers. This is in contrast to all previous work on stress sensing using fibers, which require the use of optical probing signals. In addition, it is found that more than 60 times change in conductivity between dark and illuminated states in c-Se0.5Te0.5 semiconductor core fibers. These results demonstrate that c-Se0.5Te0.5 semiconductor core optical fibers have promising applications in stress sensor, photodetector, and optical switch.

关键词： Optical materials Semiconductivity Semiconductor core fibers Stress sensing Optical switch

来源：评论

学校读者我要写书评

暂无评论

Production, purification, characterization and gene cloning of an esterase produced by Aureobasidium melanogenum HN6.2

引用

PROCESS BIOCHEMISTRY 2017年第Feb.期53卷 69-79页

作者： Chen, Cheng-Cheng Chi, Zhe Liu, Guang-Lei Jiang, Hong Hu, Zhong Chi, Zhen-Ming Ocean Univ China Coll Marine Life Sci Yushan Rd 5 Qingdao Peoples R China Shantou Univ Dept Biol Shantou 515063 Peoples R China

Aureobasidium melanogenum HN6.2 was found to able to produce an esterase of 208.1 +/- 2.7 units per ml within 72 h. A molecular weight of the purified esterase was 60.2 kDa and its PI was 4.86. The optimal pH and temperature of the purified esterase were 8.0 and 40 degrees C, respectively. The purified esterase was stable at the temperature less than 40 degrees C and in the pH range of 7.5-8.0. The esterase activity was greatly inhibited in the presence of Zn2+, Hg2+, Fe2+, Ni2+ and SDS. K-m and V-max values of the enzyme for rho-nitrophenyl butyrate were 68.6 mu M and 251.4 mu M per min, respectively. Mass analysis showed that it belonged to a carboxylesterase. After an esterase gene (Car-Est) cloned from the genomic DNA of the marine yeast strain HN6.2 was disrupted, the disruptant Y44 obtained exhibited a significant decrease in esterase activity. Meanwhile, a transcriptional level of the Car-Est gene of the disruptant Y44 was only 5.18% that of the Car-Est gene of its wild type strain HN6.2, confirming that the cloned esterase gene was indeed closely related to the esterase activity of the yeast HN6.2 strain. (C) 2016 Elsevier Ltd. All rights reserved.

关键词： Esterase Aureobasidium melanogenum Esterase gene Gene knock-out Marine yeasts

来源：评论

学校读者我要写书评

暂无评论

Preparation of CeO₂-ZrO₂-Al₂O₃ composite with layered structure for improved Pd-only three-way catalyst

引用

JOURNAL OF MATERIALS SCIENCE 2017年第16期52卷 9615-9629页

作者： Lan, Li Li, Hongmei Chen, Shanhu Chen, Yaoqiang Chengdu Univ Coll Pharm & Biol Engn Chengdu 610106 Peoples R China Sinocat Environm Protect Co Ltd Chengdu 611731 Peoples R China Sichuan Univ Coll Chem Key Lab Green Chem & Technol Minist Educ Chengdu 610064 Peoples R China

In this study, two CeO2-ZrO2-Al2O3 composites with layered structure were prepared by sequential precipitation route (SP) and compared with that obtained from conventional coprecipitation method (CC). The structural, textural and redox properties of the Pd-supported three-way catalysts were investigated by X-ray diffraction, X-ray photoelectron spectroscopy (XPS), N-2 adsorption-desorption, CO chemical adsorption, H-2-temperature-programmed reduction and oxygen storage capacity (OSC). By adjusting the precipitation sequence of CZ and Al2O3 components, different combination styles of CZ and Al2O3 as well as different interaction between the two components are obtained, which consequently modifies the physicochemical properties, catalytic performance along with the thermal stability of the supported Pd/CeO2-ZrO2-Al2O3 catalysts. The catalysts derived from SP present comparable structural and textural thermal stability compared to that obtained from CC. From the aspects of XPS, TPR and OSC, more Ce3+ and improved redox properties are created by SP with respect to CC. In addition, the dispersion of palladium is enhanced due to the strongmetal-support interaction. The catalytic performance evaluation results reveal that SP method leads to the formation of three-way catalysts with advanced catalytic activities for C3H8, CO and NO conversions especially when CZ is enriched in the outer layer.

关键词： CERIUM oxides PALLADIUM catalysts CATALYST supports COMPOSITE materials OXIDATION-reduction reaction LAYER structure (Solids)

来源：评论

学校读者我要写书评

暂无评论

Remarkably promoted low-temperature reducibility and thermal stability of CeO₂-ZrO₂-La₂O₃-Nd₂O₃ by a urea-assisted low-temperature (90 A°C) hydrothermal procedure

引用

JOURNAL OF MATERIALS SCIENCE 2017年第10期52卷 5894-5907页

作者： Zhou, Yi Deng, Jie Lan, Li Wang, Jianli Yuan, Shandong Gong, Maochu Chen, Yaoqiang Sichuan Univ Coll Chem Key Lab Green Chem & Technol Minist Educ Chengdu 610064 Sichuan Peoples R China Ctr Engn Vehicular Exhaust Gases Abatement Chengdu 610064 Sichuan Peoples R China Ctr Engn Environm Catalyt Mat Chengdu 610064 Sichuan Peoples R China Inst New Energy & Low Carbon Technol Chengdu Peoples R China

Conventional co-precipitation combined with a urea-assisted low-temperature (90 A degrees C) hydrothermal procedure (CZU) and the same method without urea (CZ) were used to prepare material CeO2-ZrO2-La2O3-Nd2O3. X-ray diffraction, Raman, nitrogen adsorption-desorption, transmission electron microscope, hydrogen-temperature programmed reduction (H-2-TPR) and X-ray photoelectron spectroscopy were employed to study the structural, textural, reduction behavior and surface elemental composition of the materials. The results reveal that, compared to CZ, CZU exhibits more outstanding structural property, higher thermal stability and higher low-temperature reducibility. The results also show that the stability of the reduction behavior is closely related to its surface chemical properties, especially the variation of the surface atomic ratio of Ce/Zr and the surface oxygen species. The possible mechanism of urea was also discussed in this study. In addition, with regard to corresponding Pd-only three-way catalysts, remarkably boosted catalytic performance of Pd/CZU is also obtained than that of Pd/CZ, and which suggests that CZU holds better prospective applications.

关键词： UREA CERIUM oxides METALS at low temperatures THERMAL stability HYDRotHERMAL deposits

来源：评论

学校读者我要写书评

暂无评论

Brain annotation toolbox: exploring the functional and genetic associations of neuroimaging results

引用

BIOINFORMATICS 2019年第19期35卷 3771-3778页

作者： Liu, Zhaowen Rolls, Edmund T. Liu, Zhi Zhang, Kai Yang, Ming Du, Jingnan Gong, Weikang Cheng, Wei Dai, Fei Wang, He Ugurbil, Kamil Zhang, Jie Feng, Jianfeng Massachusetts Gen Hosp Ctr Genom Med Psychiat & Neurodevel Genet Unit Boston MA 02114 USA Harvard Med Sch Massachusetts Gen Hosp Dept Psychiat Boston MA 02114 USA Fudan Univ Inst Sci & Technol Brain Inspired Intelligence Shanghai 200433 Peoples R China Univ Warwick Dept Comp Sci Coventry CV4 7AL W Midlands England Oxford Ctr Computat Neurosci Oxford England Shandong Univ Sch Informat Sci & Engn Jinan 250100 Shandong Peoples R China Temple Univ Dept Comp & Informat Sci Philadelphia PA 19122 USA Fudan Univ Key Lab Computat Neurosci & Brain Inspired Intell Minist Educ Shanghai 200433 Peoples R China Univ Minnesota CMRR Minneapolis MN 55455 USA Fudan Univ Collaborat Innovat Ctr Brain Sci Shanghai 200433 Peoples R China Shanghai Ctr Math Sci Shanghai 200433 Peoples R China

Motivation: Advances in neuroimaging and sequencing techniques provide an unprecedented opportunity to map the function of brain regions and identify the roots of psychiatric diseases. However, the results from most neuroimaging studies, i.e. activated clusters/regions or functional connectivities between brain regions, frequently cannot be conveniently and systematically interpreted, rendering the biological meaning unclear. Results: We describe a brain annotation toolbox that generates functional and genetic annotations for neuroimaging results. The voxel-level functional description from the Neurosynth database and gene expression profile from the Allen Human Brain Atlas are used to generate functional/genetic information for region-level neuroimaging results. The validity of the approach is demonstrated by showing that the functional and genetic annotations for specific brain regions are consistent with each other;and further the region by region functional similarity network and genetic similarity network are highly correlated for major brain atlases. One application of brain annotation toolbox is to help provide functional/genetic annotations for newly discovered regions with unknown functions, e.g. the 97 new regions identified in the Human Connectome Project. Importantly, this toolbox can help understand differences between psychiatric patients and controls, and this is demonstrated using schizophrenia and autism data, for which the functional and genetic annotations for the neuroimaging changes in patients are consistent with each other and help interpret the results.

关键词：

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：