Time filter

Source Type

Hangzhou, China

China Jiliang University is a university situated in Hangzhou, the capital city of Zhejiang Province and founded in 1978. Wikipedia.

Chen D.,Tsinghua University | Chen D.,China Jiliang University | Feng H.,Tsinghua University | Li J.,Tsinghua University
Chemical Reviews | Year: 2012

Graphene, which consists of a one-atom-thick planar sheet comprising an sp-bonded carbon structure with exceptionally high crystal and electronic quality, is a novel material that has emerged as a rapidly rising star in the field of material science. Facile electron transfer between graphene and redox species opens up opportunities for sensing strategies based on direct electron transfer rather than mediation. It is not surprising, therefore, that graphene has recently attracted great attention worldwide from the electrochemical community. Despite its short history, this 2D material has already revealed potential applications in electrochemistry, and remarkably rapid progress in this area has already been made. The oxygen functional groups have been identified as mostly in the form of hydroxyl and epoxy groups on the basal plane, with smaller amounts of carboxy, carbonyl, phenol, lactone, and quinone at the sheet edges. Source

Albert J.,Carleton University | Shao L.-Y.,China Jiliang University | Caucheteur C.,University of Mons
Laser and Photonics Reviews | Year: 2013

Optical fiber gratings have developed into a mature technology with a wide range of applications in various areas, including physical sensing for temperature, strain, acoustic waves and pressure. All of these applications rely on the perturbation of the period or refractive index of a grating inscribed in the fiber core as a transducing mechanism between a quantity to be measured and the optical spectral response of the fiber grating. This paper presents a relatively recent variant of the fiber grating concept, whereby a small tilt of the grating fringes causes coupling of the optical power from the core mode into a multitude of cladding modes, each with its own wavevector and mode field shape. The main consequence of doing so is that the differential response of the modes can then be used to multiply the sensing modalities available for a single fiber grating and also to increase the sensor resolution by taking advantage of the large amount of data available. In particular, the temperature cross-sensitivity and power source fluctuation noise inherent in all fiber grating designs can be completely eliminated by referencing all the spectral measurements to the wavelength and power level of the core mode back-reflection. The mode resonances have a quality factor of 105, and they can be observed in reflection or transmission. A thorough review of experimental and theoretical results will show that tilted fiber Bragg gratings can be used for high resolution refractometry, surface plasmon resonance applications, and multiparameter physical sensing (strain, vibration, curvature, and temperature). © 2012 by WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. Source

Kuang M.,China Jiliang University | Li Z.,Harbin Institute of Technology
Energy | Year: 2014

Low-volatile fuels such as anthracite and lean coal are widely used in power generators throughout the world. In comparison with tangential-fired and wall-arranged furnaces, down-fired boilers are thought to be more suitable for firing anthracite and lean coal. Currently, down-fired boilers are widely in service and have developed rapidly in China over the past 20 years. In this paper, a comprehensive review of investigations into the gas/particle flow, combustion and NOx emission characteristics within various types of down-fired boilers is presented. The published work disclosed that down-fired boilers suffered similarly from various problems such as late coal ignition, poor combustion stability, low burnout (carbon in fly ash typically in the range 7-15%), heavy slagging, high NOx emissions (typically in the range 1100-2100mg/m3 at 6% O2), and asymmetric combustion. Again, the causes of these problems and various solutions in dealing with them were introduced in turn. Although causes of these problems are complicated, the reported deficiencies such as the premature mixing between high-speed secondary air and low-speed fuel-rich coal/air flow, short coal/air flow penetration depth, downward coal/air flow washing over walls, shallow air-staging conditions, and asymmetric flow-field formation contribute great efforts to develop these problems. To summarize experiences and the lessons in those reported solutions, a series of suggestions for organizing reasonable combustion in down-fired furnaces have been provided so as to achieve timely ignition, symmetric and stable combustion, weak slagging, good burnout, and low NOx emissions. © 2014 Elsevier Ltd. Source

Li J.,China Jiliang University
Optics Communications | Year: 2010

We designed a narrow bandpass terahertz wave filter using photonic crystals with a line defect. An inserted linear defect in one-dimensional photonic crystal structures for a channeled filtering in the terahertz range are studied and designed theoretically. By using transfer matrix method, we examined the transmittance spectra for the proposed terahertz wave filter has a 3 dB transmission loss bandwidth of 20 MHz ranging from 0.29998 THz to 0.30001 THz. The simulated results show that a very narrow transmission band and high transmission (higher than 99.99%) centered at λ0, and very sharp edges can be achieved. © 2010 Elsevier B.V. All rights reserved. Source

Li J.-S.,China Jiliang University
Optics and Laser Technology | Year: 2011

We demonstrated experimentally a terahertz wave modulator based on optically controlled metamaterial. The signal modulation mechanism of the presented terahertz wave modulator was based on the resonance characteristic of metamaterial controlled without or with light excitation. A modulated semiconductor laser with 808 nm wavelength was employed to light the substrate. The interaction between the metamaterial and terahertz wave was strengthened and yielded an appreciable modulation of the terahertz output beam. The modulation speed is 0.1 Kb/s and the modulation depth of the proposed terahertz modulator is about 57% at a frequency of 0.32 THz. © 2010 Elsevier Ltd. All rights reserved. Source

Discover hidden collaborations