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Scoping biology-inspired chemical engineering

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Chinese Journal of Chemical Engineering 2016年第1期24卷 1-8页

作者： xiao dong chen Suzhou Key Laboratory of Green Chemical Engineering School of Chemical and Environmental Engineering College of ChemistryChemical Engineering and Material SciencesSoochow UniversitySuzhou 215000China

Biology is a rich source of great ideas that can inspire us to find successful ways to solve the challenging problems in engineering practices including those in the chemical industry. Bio-inspired chemical engineering(Bio Ch E)may be recognized as a significant branch of chemical engineering. It may consist of, but not limited to, the following three aspects: 1) Chemical engineering principles and unit operations in biological systems; 2) Process engineering principles for producing existing or developing new chemical products through living ‘devices';and 3) Chemical engineering processes and equipment that are designed and constructed through mimicking(does not have to reproduce one hundred percent) the biological systems including their physical–chemical and mechanical structures to deliver uniquely beneficial performances. This may also include the bio-inspired sensors for process monitoring. In this paper, the above aspects are defined and discussed which establishes the scope of BioChE.

关键词： Bioinspired chemical engineering Biology Chemical engineering Material science Multidisciplinary Multiscale Biomimic Bionic

Degree Conditions on Copies of Forests in Graphs

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Journal of the Operations Research Society of China 2023年第3期11卷 667-672页

作者： xiao-dong chen Shuai-Jun chen Ming-Chu Li School of Mathematics Liaoning Normal UniversityDalian116029LiaoningChina College of Science Liaoning University of TechnologyJinzhou121001LiaoningChina School of Softsware Dalian University of TechnologyDalian116024LiaoningChina

For a graph G,letμ(G)=min{max{d(x),d(y)}:x≠y,xy∉E(G),x,y∈V(G)}if G is non-complete,otherwise,μ(G)=+∞.For a given positive number s,we call that a graph G satisfies Fan-type conditions ifμ(G)≥***μ(G)≥s,then a vertex v is called a small vertex if the degree of v in G is less than *** this paper,we prove that for a forest F with m edges,if G is a graph of order n≥|F|andμ(G)≥m with at most max{n−2m,0}small vertices,then G contains a copy of *** also give examples to illustrate both the bounds in our result are best possible.

关键词： Fan-type conditions Forest Copy Small vertex

Capture Performance of A Multi-Freedom Wave Energy Converter with Different Power Take-off Systems

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China Ocean Engineering 2019年第3期33卷 288-296页

作者： HUANG Shu-ting SHI Hong-da dong xiao-chen College of Engineering Ocean University of China Qingdao 266100 China Shandong Provincial Key Laboratory of Ocean Engineering Qingdao 266100 China

Among the wave energy converters (WECs), oscillating buoy is a promising type for wave energy development in offshore area. Conventional single-freedom oscillating buoy WECs with linear power take-off (PTO) system are less efficient under off-resonance conditions and have a narrow power capture bandwidth. Thus, a multi-freedom WEC with a nonlinear PTO system is proposed. This study examines a multi-freedom WEC with 3 degrees of freedom: surge, heave and pitch. Three different PTO systems (velocity-square, snap through, and constant PTO systems) and a traditional linear PTO system are applied to the WEC. A time-domain model is established using linear potential theory and Cummins equation. The kinematic equation is numerically calculated with the fourth-order Runge–Kutta method. The optimal average output power of the PTO systems in all degrees of freedom are obtained and compared. Other parameters of snap through PTO are also discussed in detail. Results show that according to the power capture performance, the order of the PTO systems from the best to worst is snap through PTO, constant PTO, linear PTO and velocity-square PTO. The resonant frequency of the WEC can be adjusted to the incident wave frequency by choosing specific parameters of the snap through PTO. Adding more DOFs can make the WEC get a better power performance in more wave frequencies. Both the above two methods can raise the WEC’s power capture performance significantly.

关键词： oscillating buoy wave energy converter nonlinear power take-off multi-freedom power capture

Theoretical and Experimental Study of A Coaxial Double-Buoy Wave Energy Converter

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China Ocean Engineering 2021年第3期35卷 454-464页

作者： LI De-min dong xiao-chen SHI Hong-da LI Yan-ni Department of Ocean Engineering College of EngineeringOcean University of ChinaQingdao 266100China Shandong Provincial Key Laboratory of Ocean Engineering Ocean University of ChinaQingdao 266100China Qingdao Municipal Key Laboratory of Ocean Renewable Energy Ocean University of ChinaQingdao 266100China Pilot National Laboratory for Marine Science and Technology(QingDao) Qingdao 266200China

The double-body heave wave energy converter(WEC)is one of the most conducive devices to absorb the wave energy from relative motion while the law of which is not well *** paper makes an in-depth study on this wave energy converter,by means of the combination of theoretical analysis and physical model *** hydrodynamic characteristics and energy capture of the double-buoy under constant and linear Power Take-Off(PTO)damping are *** of absolute mass and mass ratio are discussed in the theoretical *** displacement amplitude and average power output are tested in the experiment to analyze the effect of the wave period and outer buoy’s mass,while the capture width ratio(CWR)is also *** show that the wave period and mass of the buoys have a significant effect on the *** forms of PTO damping have no influence on the optimal wave period and mass ratio of this *** is recommended to select the double-buoy converter with a mass ratio of 0.80 and to place it in an area with the frequent wave period close to the natural period of the outer buoy to achieve the optimal energy capture.

关键词： coaxial double-buoy wave energy converter hydrodynamic characteristics model test power take-off

Dual-polarization two-dimensional valley photonic crystals

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Science China(Physics,Mechanics & Astronomy) 2022年第8期65卷 102-109页

作者： Xin-Tao He Jian-Wei Liu Fu-Long Shi Ke Shen Wen-Jie chen xiao-dong chen Jian-Wen dong School of Physics State Key Laboratory of Optoelectronic Materials and TechnologiesSun Yat-sen UniversityGuangzhou510275China

The recent realization of valley physics in photonic systems has enriched the topological phases of light with protected edge modes and shown applications in designing high-performance photonic devices. However, the widely reported valley Hall effect of light in two-dimensional systems is limited to one single polarization. Here, we present dual-polarization two-dimensional valley photonic crystals by simultaneously opening two frequency accidental degenerate Dirac cones. Two band gaps with different polarizations are characterized by opposite-valley Chern numbers, which are confirmed by the opposite-phase vortex distributions of bulk modes and opposite Berry curvatures. This situation results in the polarization-dependent refraction of bulk and edge modes, which locate in opposite valleys. The polarization-independent topological valley transport is also demonstrated. Our work shows the flexible control of light in topological photonic systems with a polarization degree of freedom and has applications in polarization multiplexing photonic devices.

关键词： topological photonics valley photonic crystals polarization

A recessive gene controlling male sterility sensitive to short daylength/low temperature in wheat(Triticum aestivum L.)

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Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2011年第11期12卷 943-950页

作者： xiao-dong chen dong-fa SUN De-fu RONG Jun-hua PENG cheng-dao LI College of Plant Science and Technology Huazhong Agricultural University Wuhan 430070 China Shayang Agricultural Research Institute Shayang 448200 China Wuhan Botanical Garden Chinese Academy of Sciences Wuhan 430074 China Department of Agriculture Government of Western Australia South Perth WA 6151 Australia

Utilization of a two-line breeding system via photoperiod-thermo sensitive male sterility has a great potential for hybrid production in wheat （Triticum aestivum L.）. 337S is a novel wheat male sterile line sensitive to both short daylength/Iow temperature and long daylength/high temperature. Five F2 populations derived from the crosses between 337S and five common wheat varieties were developed for genetic analysis. All Fl＇s were highly fertile while segregation occurred in the F2 populations with a ratio of 3 fertile：l sterile under short daylength/Iow temperature. It is shown that male sterility in 337S was controlled by a single recessive gene, temporarily designated as wptms3. Bulked segregant analysis （BSA） coupled with simple sequence repeat （SSR） markers was applied to map the sterile gene using one mapping population. The wptms3 gene was mapped to chromosome arm 1BS and flanked byXgwm413 and Xgwm182 at a genetic distance of 3.2 and 23.5 cM, respectively. The accuracy and efficiency of marker-assisted selection were evaluated and proved essential for identifying homozygous recessive male sterile genotypes of the wptms3 gene in F2 generation.

关键词： Heterosis wptms3 Short daylength/Iow temperature sensitive male sterility Molecular mapping Triticum aestivum

Power Absorption of A Two-Body Heaving Wave Energy Converter Considering Different Control and Power Take-off Systems

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China Ocean Engineering 2022年第1期36卷 15-27页

作者： dong xiao-chen GAO Zhen LI De-min HUANG Shu-ting SHI Hong-da Department of Ocean Engineering College of EngineeringOcean University of ChinaQingdao 266100China Department of Marine Technology and Centre for Autonomous Marine Operations and Systems(AMOS) Norwegian University of Science and Technology(NTNU)Trondheim 7491Norway Shandong Provincial Key Laboratory of Ocean Engineering Ocean University of ChinaQingdao 266100China Qingdao Municipal Key Laboratory of Ocean Renewable Energy Ocean University of ChinaQingdao 266100China Institute of Marine Science and Technology Shandong UniversityQingdao 266237China

This study proposed a wave power system with two coaxial floating cylinders of different diameters and ***’s conceptual design has been adopted in the wave power *** this study,a basic analysis of the wave energy extraction by the relative motion between two floats is *** maximum power absorption was studied theoretically under regular wave conditions,and the effects of both linear and constant damping forces on the power take-off(PTO)were investigated.A set of dynamic equations describing the floats’displacement under regular waves and different PTOs are established.A time-domain numerical model is developed,considering the PTO parameter and viscous damping,and the optimal PTO damping and output power are *** the analysis of estimating the maximum power absorption,a new estimation method called Power Capture Function(PCF)is proposed and constructed,which can be used to predict the power capture under both linear and constant PTO *** on this,energy extraction is analyzed and ***,the performance characteristics of the two-body power system are concluded.

关键词： two-body heaving wave energy converter power capture function power take-off

Ideal nodal rings of one-dimensional photonic crystals in the visible region

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Light(Science & Applications) 2022年第6期11卷 1178-1185页

作者： Wei-Min Deng Ze-Ming chen Meng-Yu Li Chao-Heng Guo Zhong-Tao Tian Ke-Xin Sun xiao-dong chen Wen-Jie chen Jian-Wen dong School of Physics&State Key Laboratory of Optoelectronic Materials and Technologies Sun Yat-sen University510275 GuangzhouChina

Three-dimensional(3D)artificial metacrystals host rich topological phases,such as Weyl points,nodal rings,and 3D photonic topological *** topological states enable a wide range of applications,including 3D robust waveguides,one-way fiber,and negative refraction of the surface ***,these carefully designed metacrystals are usually very complex,hindering their extension to nanoscale photonic ***,we theoretically proposed and experimentally realized an ideal nodal ring in the visible region using a simple 1D photonic *** TT-Berrry phase around the ring is manifested by a 2π reflection phase's winding and the resultant drumhead surface *** breaking the inversion symmetry,the nodal ring can be gapped and the n-Berry phase would diffuse into a toroidal-shaped Berry flux,resulting in photonic ridge states(the 3D extension of quantum valley Hall states).Our results provide a simple and feasible platform for exploring 3D topological physics and its potential applications in nanophotonics.

关键词： topological nodal visible

Hydrodynamic Performance and Power Absorption of A Coaxial DoubleBuoy Wave Energy Converter

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China Ocean Engineering 2023年第3期37卷 378-392页

作者： LI De-min dong xiao-chen LI Yan-ni HUANG He-ao SHI Hong-da College of Engineering Ocean University of ChinaQingdao 266400China Shandong Provincial Key Laboratory of Ocean Engineering Qingdao 266100China Qingdao Municipal Key Laboratory of Ocean Renewable Energy Ocean University of ChinaQingdao 266100China

As an important wave energy converter(WEC),the double-buoy device has advantages of wider energy absorption band and deeper water adaptability,which attract an increasing number of attentions from *** paper makes an in-depth study on double-buoy WEC,by means of the combination of model experiment and numerical *** Response Amplitude Operator(RAO)and energy capture of the double-buoy under constant power take-off(PTO)damping are investigated in the model test,while the average power output and capture width ratio(CWR)are calculated by the numerical simulation to analyze the influence of the wave condition,PTO,and the geometry parameters of the *** AQWA-Fortran united simulation sy stem,including the secondary developme nt of AQWA software coupled with the flowchart of the Fortran code,models a new dynamic *** viscous damping and hydraulic friction from WEC system are measured from the experimental results,and these values are added to the equation of *** a result,the energy loss is contained in the final numerical model the by united simulation *** the developed numerical model,the optimal period of energy capture is *** power capture reaches the maximum value under the outer buoy's natural *** paper gives the peak value of the energy capture under the linear PTO damping force,and calculates the optimal mass ratio of the device.

关键词： coaxial double-buoy wave energy converter physical model experiment numerical simulation hydrodynamic performance