检索结果-内蒙古大学图书馆

IEEE Nuclear Science Symposium/Medical Imaging Conference

作者： Labanti, Claudio Marisaldi, Martino Fuschino, Fabio Bastia, Paolo Negri, Barbara Perotti, Francesco Soltau, Heike INAF IASF Dept Bologna Italy Thales Alenia Space Milano Milan Italy Agenzia Spaziale Italiana Rome Italy INAF IASF Dept Milan Italy PN Sensor Munche Germany Germany

ISBN: (纸本)9781424427147

A The instruments on board the latest gamma observatories (INTEGRAL, AGILE, GLAST) combines technologies based either on solid state or on scintillator detector, the first one being favorite when a low energy threshold and a good energy resolution is required, the latter being more convenient for large volume when worse performance are still acceptable. With the development of new scintillator materials and even more with new low-noise ligth readout devices the differences between the two techniques are narrowing and for some application the cheaper scintillator detector can compete with solid state devices. Furthermore both these detector concepts can be combined in a single compact device by means of the Pulse Shape Discrimination (PSD) technique that allows to discriminate direct interactions in silicon from scintillation events. Combined in arrays they can be the base for position senstive planes to be combined with coded mask in imaging instruments or the component of new generation Compton based telescopes. For this purpose two prototype systems have been designed and realized, both based on a 20 channels Silicon Drift Detectors (SDD) monolithic array coupled to individual 1 cm thick CsI(TI) scintillator crystals. In the first system the detector readout is implemented with ASICs tailored specifically to the SDD readout, while in the second system the PSD readout of the array is implemented. The performance of these kind of detectors tested in the various prototypes as well as their applications in new generation space telescopes are discussed.

关键词： Cesium iodide

来源：评论

学校读者我要写书评

暂无评论

Compact mid-infrared trace gas sensor based on difference frequency mixing

Compact mid-infrared trace gas sensor based on difference fr...

引用

Proceedings of the 1999 Application of Tunable Diode and Other Infrared Sources for Atmospheric Studies and Industrial Processing Monitoring ii

作者： Tittel, Frank K. Lancaster, David G. Richter, Dirk Goldberg, Lew Koplow, Jeffrey P. Rice Univ Houston United States

The development of compact mid-IR sources using frequency-converted diode lasers has been demonstrated to be applicable for the ultra sensitive, selective, and real time detection of many trace gas species in the infrared spectroscopic fingerprint region, which contains virtually all the fundamental vibrational modes of molecules. This development of infrared laser sources has taken advantage of recent significant technological advances of semiconductor diode lasers and solid state lasers, new nonlinear optical materials, optical fiber and novel data acquisition techniques. Such sensors are able to detect molecules at the parts-per-billion (ppb) level in ambient air using infrared absorption spectroscopy either by monitoring trace gases in an open path or multi-pass cell configuration. Real world applications ranging from urban, industrial, rural emission studies to spacecraft habitat monitoring are described.

关键词： Semiconductor lasers

来源：评论

学校读者我要写书评

暂无评论

Advanced multifunctional detectors for laser-gated imaging applications

Advanced multifunctional detectors for laser-gated imaging a...

引用

32nd Conference on Infrared Technology and applications

作者： Baker, Ian Thorne, Peter Henderson, James Copley, Jeremy Humphreys, David Millar, Alasdair SELEX Sensors & Airborne Syst Infra Red Ltd POB 217 Southampton Hants England SELEX Sensors & Airborne Syst Ltd Edinburgh Midlothian Scotland

ISBN: (纸本)0819462624

The rapid pace of development in the field of long-range imaging is illustrated by two new detector technologies for passive and active imaging. Active systems, using a near-infrared pulse laser and a fast, gated detector, are now adopted for most long range imaging applications. This concept is often called burst-illumination LIDAR or BIL. The SELEX solid state detector is based on two major components: an array of HgCdTe avalanche photodiodes, and a custom-designed CMOS multiplexer to perform the fast gating and photon signal capture. These hybrid arrays produce sensitivities as low as 10 photons rms, due largely to very high, almost noise-free avalanche gain in the HgCdTe diodes. The sensitivity, dynamic range and image quality is now such that the camera performance is usually limited by coherence and scintillation effects in the scene. With this strong sensor capability, it has been possible to launch the next generation of multiplexers to satisfy systems of the future. For instance, most laser-gated imaging systems use a suite of passive infrared and visible cameras to complement the BIL channel. It is highly advantageous to combine these functions into one electro-optic system, leading to a simpler, smaller, lower power and lower cost system. The key technical steps are to find solutions for the difficult multifunctional detector and the dual-wavelength optic. A detector has been developed to image passively in the medium and short wavebands, and actively in BIL mode. The performance of the detector and optic is described. Another major systems enhancement is to be able to generate 3D images, particularly in complex scenes, to further improve background clutter rejection and provide agile, feedback control of the range gating in a dynamic environment. Here the detector senses the range, as well as the laser pulse intensity, on a pixel-by-pixel basis, providing depth context for each laser pulse. A prototype detector has been successfully demonstrated and show

关键词： LADAR LIDAR active imaging HgCdTe avalanche photodiode APD SW 3D imaging

来源：评论

学校读者我要写书评

暂无评论

A novel biomimetic olfactory cell-based biosensor with DNA-directed site-specific immobilization of cells on a microelectrode array

引用

sensorS AND ACTUATORS B-CHEMICAL 2015年 217卷 186-192页

作者： Du, Liping Zou, Ling Wang, Qin Zhao, Luhang Huang, Liquan Wang, Ping Wu, Chunsheng Zhejiang Univ Dept Biomed Engn Minist Educ Biosensor Natl Special LabKey Lab Biomed Engn Hangzhou 310027 Peoples R China Zhejiang Univ Sch Med Dept Biochem & Genet Hangzhou 310058 Zhejiang Peoples R China Monell Chem Senses Ctr Philadelphia PA 19104 USA Chinese Acad Sci State Key Lab Transducer Technol Shanghai 200050 Peoples R China

The coupling of cells with transducers is a key step to develop cell-based biosensors in order to meet the specific performance requirements for biomedical applications. This study describes a novel biomimetic olfactory cell-based biosensor by the employment of a DNA-directed site-specific cell immobilization method, which can achieve controllable and high-efficient coupling between olfactory cells and the microelectrode array (MEA) chip. A pair of complementary thiol-modified single-stranded DNA (ssDNA) was designed and synthesized. One of them was covalently attached to the plasma membrane of olfactory cells that were isolated from rats. The other one was used as ssDNA probes and immobilized on the gold surface of microelectrodes on MEA chip. Based on the mechanism of complementary ssDNA hybridization, olfactory cells were site-specifically immobilized on the surface of microelectrodes. The distribution of olfactory cells on the surface of MEA chip was controlled by the pattern of ssDNA probes on the sensor surface. The fluorescent staining results indicate that olfactory cells were site-specifically coupled with the microelectrode array on the surface of a MEA chip, which formed a desirable olfactory cell array. In addition, extracellular recordings from the coupled olfactory cells demonstrate that microelectrodes can efficiently monitor the membrane potential changes originated from olfactory cells in response to odorant stimulations. This biomimetic olfactory cell-based biosensor can not only be used for the detection of odorant molecules, but also be applied for the research on the olfactory signal transduction mechanisms. This DNA-directed cell immobilization method provides a novel approach for controllable cell immobilization on solid support and consequently, contributes to the development of cell micro arrays for cell-based biosensors. (C) 2014 Elsevier B.V. All rights reserved.

关键词： Biosensor Olfactory cell DNA hybridization Cell immobilization Microelectrode array

来源：评论

学校读者我要写书评

暂无评论

Editors' Choice-Critical Review-A Critical Review of solid state Gas sensors

引用

JOURNAL OF THE ELECTROCHEMICAL SOCIETY 2020年第3期167卷

作者： Hunter, Gary W. Akbar, Sheikh Bhansali, Shekhar Daniele, Michael Erb, Patrick D. Johnson, Kevin Liu, Chung-Chiun Miller, Derek Oralkan, Omer Hesketh, Peter J. Manickam, Pandiaraj Vander Wal, Randy L. NASA Glenn Res Ctr Cleveland OH 44134 USA Ohio State Univ Columbus OH 43210 USA Florida Int Univ Miami FL 33174 USA North Carolina State Univ Raleigh NC 27695 USA Univ North Carolina Chapel Hill Chapel Hill NC 27599 USA US Naval Res Lab Washington DC 20375 USA Case Western Reserve Univ Cleveland OH 44106 USA Georgia Inst Technol Atlanta GA 30332 USA CSIR Cent Electrochem Res Inst Karaikkudi 630003 Tamil Nadu India Penn State Univ State Coll PA 16801 USA

solid state gas sensors are a core enabling technology to a range of measurement applications including industrial, safety, and environmental monitoring. The technology associated with solid-state gas sensors has evolved in recent years with advances in materials, and improvements in processing and miniaturization. In this review, we examine the state-of-the-art of solid state gas sensors with the goal of understanding the core technology and approaches, various sensor design methods to provide targeted functionality, and future prospects in the field. The structure, detection mechanism, and sensing properties of several types of solid state gas sensors will be discussed. In particular, electrochemical cells (solid and liquid), impedance/resistance based sensors (metal oxide, polymer, and carbon based structures), and mechanical sensing structures (resonators, cantilevers, and acoustic wave devices) as well as sensor arrays and supporting technologies, are described. development areas for this field includes increased control of material properties for improved sensor response and durability, increased integration and miniaturization, and new material systems, including nano-materials and nano-structures, to address shortcomings of existing solid state gas sensors. (c) 2020 The Author(s). Published on behalf of The Electrochemical Society by IOP Publishing Limited.

关键词： Metals

来源：评论

学校读者我要写书评

暂无评论

Photon counting imaging in the infrared with e-APD arrays 12

Photon counting imaging in the infrared with e-APD arrays

引用

Terahertz, RF, Millimeter, and Submillimeter-Wave Technology and applications Xii 2019

作者： Gach, J.L. UMR 7326 Marseille13388 France First Light Imaging Group Europarc Ste Victoire - Route de Valbrillant - Le Canet Meyreuil13590 France

ISBN: (纸本)9781510624764

Since the first photon counting systems in the visible, developped by Boksenberg and his collabortors in 1972, many groups around the world improved photon counting techniques. In the 2000's in the visible, EMCCDSs (electron multiplying charge coupled devices) allowed to replace the classical image intensifier photon counting systems by solid state devices and improved a lot the QE. But EMCCDs suffer from several issues, and the most important of them is the excess noise factor which prevents to know what is the exact incoming number pf photons in the case of multiple photons per pixel. In the infrared there was no equivalent to EMCCDs up to the development of e-APD sensors and cameras made with HgCdTe material (electron initiated avalanche photo diode). We will present the concepts of photon counting in the infrared with such devices and the main properties and advantages of infrared e-APDs compared to their visible counterpart, EMCCDs and the possibility to detect the photon energy (color) with such devices. © 2019 SPIE.

关键词： ii-VI semiconductors

来源：评论

学校读者我要写书评

暂无评论

3D-printed, low-cost, lightweight optomechanics for a compact, low-power solid-state amplifier system 6

3D-printed, low-cost, lightweight optomechanics for a compac...

引用

Conference on Components and Packaging for Laser Systems VI

作者： Kranert, Fabian Budde, Jana Neef, Philipp Bernhard, Robert Lammers, Marius Rettschlag, Katharina Grabe, Tobias Wienke, Andreas Neumann, Joerg Wiche, Henning Wesling, Volker Ahlers, Henning Lachmayer, Roland Kracht, Dietmar Laser Zentrum Hannover eV Hollerithallee 8 D-30419 Hannover Germany Clausthaler Zentrum Mat Tech Agr Str 2 D-38678 Clausthal Zellerfeld Germany Hsch Hannover Fak II Ricklinger Stadtweg 120 D-30459 Hannover Germany Inst Prod Wicklung & Geratebau Welfengarten 1A D-30167 Hannover Germany

ISBN: (纸本)9781510632868

The use of additive manufacturing methods in research and industry has led to the possibility of designing more compact, light and low-cost assemblies. In the field of laser development, new opportunities resulting from additive manufacturing have rarely been considered so far. We present a compact, lightweight solid-state amplifier system for low-power applications where the optomechanical components are manufactured completely additive via Fused Filament Fabrication (FFF). The amplifier system is based on a Nd:YVO4-crystal pumped with an external, fiber-coupled diode at a wavelength of 808nm and a maximum output power of 3 W. The seed source is a Nd:YVO4-crystal based solid-state laser with an emission wavelength of 1064 nm. The commercial optical components, such as lenses and crystal, are firmly imprinted via FFF in the optomechanics and thus secured against misalignment. Additionally, sensor technology for temperature measurement is implemented into the devices. The use of FFF, in which the components are printed from polymers, results in a lightweight yet stable construction. We have shown, that optical components can be imprinted without adding mechanical stress. To increase the mechanical and thermal robustness of the system different types of polymers as well as post process treatments are tested and the use of Laser Metal Deposition for this application is investigated. The thermal stability of the printed structures is evaluated to determine the maximum power level of the system without damaging the polymer-optomechanics. Furthermore, output power, optical-to-optical efficiency, beam pointing, and beam shape are measured for several on- and off-switching processes as well as long-term operation.

关键词： 3D-printed optomechanics solid-state amplifier packaging and mounting of optical components additive manufacturing compact and lightweight optomechanics

来源：评论

学校读者我要写书评

暂无评论

Design possibilities for photodiode arrays with integral silicon-gate scan generators

Design possibilities for photodiode arrays with integral sil...

引用

IEEE International Conference on solid-state Circuits (ISSCC)

作者： G. Weckler R. Dyck Fairchild Research and Development Lab. Palo Alto CA USA

A RECENTLY-DESCRIBED single-dimension self-scanning photodiode array has been seminal to a growing number of modified structures for a variety of applications. The MOS shift register, which controls array scanning, has in particular demonstrated considerable versatility and applicability for different array designs. This paper will discuss the tradeoffs in shift register and photodiode structure which set the limits on array performance.

关键词： Photodiodes sensor arrays Shift registers Clocks FETs Capacitance Impedance Sampling methods Diodes Charge transfer

来源：评论

学校读者我要写书评

暂无评论

Plant Growth Optimization Using Variable Intensity and Far Red LED Treatment in Indoor Farming 1

Plant Growth Optimization Using Variable Intensity and Far R...

引用

International Conference on Smart Smart sensors and applications

作者： Harun, Ahmad Nizar Ahmad, Robiah Mohamed, Norliza UTM Razak Sch Engn Kuala Lumpur Malaysia UTM Adv Technol Sch Kuala Lumpur Malaysia MIMOS Berhad Minist Sci Technol & Innovat Kuala Lumpur Malaysia

ISBN: (纸本)9781479973644

Plant growth optimization using LED light has been conducted to study the best method to reduce power consumption and obtain the optimum growth. In this study a system that able to produce variable intensity using microcontroller, solid state and dimmable LED light has been proposed. Two experiments were conducted with i) combined Red / Blue/White (RBW) LEDs of ratio 16: 4: 2 as light source for 12 hours photoperiod treatment ii) Red/Blue/Far Red (RBFR) LEDs of ratio 16: 4: 16 as light source for 12 hours photoperiod treatment. The finding from the experiment has shown that variable intensity method has proven to reduce overall power consumption, increase mortality of the plant by introducing hardening process and significantly RF treatment has shown to delay the flowering process. Our analysis shows that the system allowed the finding of a new method on optimization of plant growth using LED light with variable intensity and shows significant difference on flowering respond using FR treatment. Prototype of the proposed system has been developed in small scale hydroponic plant growth chamber. Data acquisition and remote management of the system is used to maintain humidity, temperature, CO2 concentration and light intensity and development of automated system for plant manipulation.

关键词： Indoor Farming Far Red Treatment for Flowering Control Wireless sensor Network Indoor Farming Plant Factory LED Light Spectrum sensor Variable Intensity Treatment and Intelligent Control Farming

来源：评论

学校读者我要写书评

暂无评论

Surface engineered bimetallic gold/silver nanoclusters for in situ imaging of mercury ions in living organisms

引用

ANALYTICAL AND BIOANALYTICAL CHEMISTRY 2022年第14期414卷 4235-4244页

作者： Wang, Jianping Wang, Wang Yang, Linlin Zhao, Jun Han, Guangmei Yu, Xiaoping ShenTu, Xuping Ye, Zihong China Jiliang Univ Coll Life Sci Zhejiang Prov Key Lab Biometrol & Inspect & Quara Hangzhou 310018 Peoples R China West Anhui Univ Sch Mat & Chem Engn Key Lab Biomimet Sensor & Detecting Technol Anhui Luan 237012 Anhui Peoples R China Chinese Acad Sci Inst Solid State Phys Hefei Inst Phys Sci Hefei 230031 Anhui Peoples R China

Chemical sensing for the sensitive and reliable detection of mercury(ii) ions (Hg2+) is of great importance in environmental protection, food safety, and biomedical applications. Due to the bio-enrichment property of Hg2+ in organisms, it is particularly meaningful to develop an effective tool that can in situ and rapidly monitor the level of Hg2+ in living organisms. In this work, we report ligand functionalized gold-silver bimetallic nanoclusters with bright red fluorescence as intracellular probes for imaging Hg2+ in living cells and zebrafish. The bimetallic nanoclusters of DTT-GSH@Au/AgNCs (DG-Au/AgNCs) with strong fluorescence that benefited from the synergistic effect of Au and Ag atoms were obtained through a one-pot synthesis method, incorporating glutathione (GSH) and dithiothreitol (DTT) as the reducers and functionalized ligands. Attractively, the bright red fluorescence of DG-Au/AgNCs could be rapidly and selectively quenched by Hg2+ within 1 min with a very low detection limit of 1.01 nM. Additionally, DG-Au/AgNCs had a great advantage in the detection of Hg2+ in living cells and zebrafish owing to its notably strong red fluorescence at 665 nm, which could avoid effectively auto-fluorescence interference from the organism. Such easily prepared bimetallic fluorescent nanoclusters would be expected to provide a noninvasive and sensitive approach in the detection of heavy metals in situ for environmental protection.

关键词： Bimetallic nanoclusters Red emission Hg2+ In situ Bioimaging

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：