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排序方式: 共有1296条查询结果,搜索用时 31 毫秒
31.
In this paper, we review the state-of-the-art in surface-enhanced Raman scattering (SERS) based optical detection techniques
with an application focus on cancer diagnostics. As we describe herein, SERS has several analytical, biological and engineering
advantages over other methods including extremely high sensitivity, inherent molecular specificity of unlabeled targets, and
narrow spectral bands. We review advances in both in vitro and in vivo applications of SERS and examine how technical issues
with the technology are being addressed. A special technology focus is given to emerging optofluidic devices which aim to
merge microfluidic and optical detection technologies into simple packages. We conclude with a brief discussion of some of
the emerging challenges in the field and some of the approaches that are likely to enhance their application.
Y. S. Huh and A. J. Chung contributed equally. 相似文献
32.
Hongkyu Eoh Youngdoo Jung Chanho Park Chang Eun Lee Tae Hyun Park Han Sol Kang Seungbae Jeon Du Yeol Ryu June Huh Cheolmin Park 《Advanced functional materials》2022,32(1):2103697
Structural color (SC) arising from a periodically ordered self-assembled block copolymer (BCP) photonic crystal (PC) is useful for reflective-mode sensing displays owing to its capability of stimuli-responsive structure alteration. However, a set of PC inks, each providing a precisely addressable SC in the full visible range, has rarely been demonstrated. Here, a strategy for developing BCP PC inks with tunable structures is presented. This involves solution-blending of two lamellar-forming BCPs with different molecular weights. By controlling the mixing ratio of the two BCPs, a thin 1D BCP PC film is developed with alternating in-plane lamellae whose periodicity varies linearly from ≈46 to ≈91 nm. Subsequent preferential swelling of one-type lamellae with either solvent or non-volatile ionic liquid causes the photonic band gap of the films to red-shift, giving rise to full-visible-range SC correlated with the pristine nanostructures of the blended films in both liquid and solid states. The BCP PC palette of solution-blended binary solutions is conveniently employed in various coating processes, allowing facile development of BCP SC on the targeted surface. Furthermore, full-color SC paintings are realized with their transparent PC inks, facilitating low-power pattern encryption. 相似文献
33.
Photonic Reactions Leading to Fluorescence in a Polymeric System Induced by the Photothermal Effect of Magnetite Nanoparticles Using a 780 nm Multiphoton Laser
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Bum Chul Park Hee‐Dae Kim June Park Yu Jin Kim Young Keun Kim 《Small (Weinheim an der Bergstrasse, Germany)》2017,13(37)
Recently, polymer‐coated magnetite (Fe3O4) nanoparticles (NPs) are extensively studied for applications in therapeutics or diagnostics using photothermal effect. Therefore, it is essential to understand the interactions between Fe3O4 NPs and polymers when optical stimuli are applied. Herein, the photonic reactions of Fe3O4 NPs and polymer composites upon application of a 780 nm multiphoton laser are analyzed. The photonic reactions produce unique results including fluorescence from conformationally changed polymer and low‐temperature phase transformation of Fe3O4 NPs. Typically, π‐conjugated chains are formed, inducing fluorescence through a series of main and side‐chain cleavage reactions of polymers with the aliphatic chain. In addition, fluorescence is detected in the cellular system by photonic reactions between Fe3O4 NPs and biomolecules. After multiphoton laser irradiation, light emission is detected near the intracellular Fe3O4 NPs, and a stronger intensity is observed in large‐sized NPs. 相似文献
34.
Triple Emulsion Drops with An Ultrathin Water Layer: High Encapsulation Efficiency and Enhanced Cargo Retention in Microcapsules
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35.
Byung June Choi Bumsoo Kim Sung Moon Jin Ja Choon Koo Wan Kyun Chung Hyouk Ryeol Choi Hyungpil Moon 《Intelligent Service Robotics》2010,3(2):99-113
We propose a precise position error compensation and low-cost relative localization method in structured environments using
magnetic landmarks and hall sensors. The proposed methodology can solve the problem of fine localization as well as global
localization by tacking landmarks or by utilizing various patterns of magnetic landmark arrangement. In this paper, we consider
two patterns of implanted permanent magnets on the surface, namely, at each vertex of regular triangles or rectangles on a
flat surface. We show that the rectangular configuration of the permanent magnetic bars is better for a robust localization
under sensor noise. For the experiments, permanent magnet sets in rectangular configuration are placed on the floor as landmarks
at regular intervals, and magnetic hall sensors are installed at the bottom of a mobile robot. In our implementation, the
accuracy after the error compensation is less than 1 mm in the position and less than 1° in the orientation. Due to the low
cost and accuracy of the proposed methodology, it would be one of the practical solutions to the pose error correction of
a mobile robot in structured environments. 相似文献
36.
37.
Stephen G. McGill Seung‐Joon Yi Hak Yi Min Sung Ahn Sanghyun Cho Kevin Liu Daniel Sun Bhoram Lee Heejin Jeong Jinwook Huh Dennis Hong Daniel D. Lee 《野外机器人技术杂志》2017,34(4):775-801
This paper describes Team THOR's approach to human‐in‐the‐loop disaster response robotics for the 2015 DARPA Robotics Challenge (DRC) Finals. Under the duress of unpredictable networking and terrain, fluid operator interactions and dynamic disturbance rejection become major concerns for effective teleoperation. We present a humanoid robot designed to effectively traverse a disaster environment while allowing for a wide range of manipulation abilities. To complement the robot hardware, a hierarchical software foundation implements network strategies that provide real‐time feedback to an operator under restricted bandwidth using layered user interfaces. Our strategy for humanoid locomotion includes a backward‐facing knee configuration paired with specialized toe and heel lifting strategies that allow the robot to traverse difficult surfaces while rejecting external perturbations. With an upper body planner that encodes operator preferences, predictable motion plans are executed in unforeseen circumstances. These plans are critical for manipulation in unknown environments. Our approach was validated during the DRC Finals competition, where Team THOR scored three points in 18 min of operation time, and the results are presented along with an analysis of each task. 相似文献
38.
Sarah Mostame Joonsuk Huh Christoph Kreisbeck Andrew J. Kerman Takatoshi Fujita Alexander Eisfeld Alán Aspuru-Guzik 《Quantum Information Processing》2017,16(2):44
With quantum computers being out of reach for now, quantum simulators are alternative devices for efficient and accurate simulation of problems that are challenging to tackle using conventional computers. Quantum simulators are classified into analog and digital, with the possibility of constructing “hybrid” simulators by combining both techniques. Here we focus on analog quantum simulators of open quantum systems and address the limit that they can beat classical computers. In particular, as an example, we discuss simulation of the chlorosome light-harvesting antenna from green sulfur bacteria with over 250 phonon modes coupled to each electronic state. Furthermore, we propose physical setups that can be used to reproduce the quantum dynamics of a standard and multiple-mode Holstein model. The proposed scheme is based on currently available technology of superconducting circuits consist of flux qubits and quantum oscillators. 相似文献
39.
Chung JY Lee SJ Kris Y Braunschweig T Traicoff JL Hewitt SM 《Proteomics. Clinical applications》2008,2(10-11):1539-1547
Proteomic analysis of formalin-fixed paraffin-embedded (FFPE) tissue offers significant diagnostic utility but is complicated due to the high level of covalently crosslinked proteins arising from formalin fixation. To address these challenges, we developed a reliable protein extraction method for FFPE tissue, based on heat-induced antigen retrieval within a pressure cooker. The protein extraction yield from archival FFPE tissue section is approximately 90% of that recovered from frozen tissue. This method demonstrates preservation of immunoreactivity and recovery of full-length proteins by Western blotting. Additionally, we developed a well-based RP protein array platform utilizing an electrochemiluminescence detection system. Protein samples derived from FFPE tissue by means of laser capture dissection, with as few as 500 shots demonstrate measurable signal differences for different proteins. The lysates coated to the array plate, remain stable over 1?month at room temperature. Theses data suggest that this new protein-profiling platform coupled with the protein extraction method can be used for molecular profiling analysis in FFPE tissue, and contribute to the validation and development of biomarkers in clinical studies. 相似文献
40.
Joon-Chul?Lee Moon-Sun?Kim Chul?Kyung?Kim Chan-Hwa?Chung Sung?M.?Cho Gui?Young?Han Ki?June?Yoon Byung-Woo?KimEmail author 《Korean Journal of Chemical Engineering》2003,20(5):862-868
Experiments were performed to investigate the effect of operating parameters on the photodegradation efficiency of paraquat
in a TiO2-suspended photoreactor with immersed UV lamps. TiO2 particles were prepared by a hydrothermal method. The removal rate of paraquat in the reactor was 0.54 mg/l/h with only air-sparging.
The removal rate in 24 h with both the UV radiation and air-sparging was 50% higher than that with only the UV radiation.
Variations of the paraquat concentration at the UV intensities of 4 and 8 W/m2 decreased slowly with time, but that at 12 W/m2 decreased more rapidly. The removal efficiency at the air-sparging flow rate of 1 //min increased as a UV light intensity
increased. pH value in the reactor at the UV intensity of 12 W/m2 decreased with time until 12 h and then increased with time over 12 h. 相似文献