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| 1 | Temperature field reconstruction of 3D luminous flames based on light field tomography theory显示文摘Standard plenoptic camera can be used to capture multi-dimensional radiation information of high temperature luminous flame to reconstruct the temperature distribution. In this study, a novel method for reconstructing three-dimensional temperature field is proposed. This method is based on the optical tomography combined with standard plenoptic camera. The flame projection information from different planes is contained in one radiation image. In this model, we introduced the effective concept of the nearest neighbor method in the frequency domain to strip the interference of redundant information in the projection and to realize three-dimensional deconvolution. The flame emission intensity received by the pixels on the charge-coupled device sensor can be obtained according to the optical tomographic model. The temperature distributions of the axisymmetric and nonaxisymmetric flames can be reconstructed by solving the mathematical model with the nearest neighbor method. The numerical results show that three-dimensional temperature fields of high temperature luminous flames can be retrieved, proving the validity of the proposed method. | NIU ZhiTian QI Hong SHI JingWen ZHANG JuQi REN YaTao | 2021 | Science China(Technological Sciences)2021，64，2： | 6 |
| 2 | Self-powered electrochromic devices with tunable infrared intensity显示文摘Triboelectric nanogenerator(TENG) is an efficient way to convert ambient mechanical energy into electricity to power up portable electronics.In this work,a flexible infrared electrochromical device(IR-ECD)with stable performances was assembled with a TENG for building self-powered infrared detector with tunable intensity.As driven by TENG,the electrochromic device could be operated in the mid-IR region due to the reversible electrochromic reactions.An average infrared reflectance contrast of 46% was achieved in 8–14 lm regions and as well a clear thermal image change can be observed.This work indicates that the TENG-driven infrared electrochromical device has potential for use in self-powered camouflage and thermal control. | Jiangman sun xiong pu Chunyan Jiang Chunhua Du Mengmeng Liu Yang Zhang Zhitian Liu Junyi Zhai Weiguo Hu Zhong Lin Wang | 2018 | Science Bulletin2018，63，12： | 6 |
| 3 | Types, Metallogenic Environments and Characteristics of Temporal and Spatial Distribution of Copper Deposits in China显示文摘Based upon a comprehensive study of 123 copper deposits in China. this paper reaches the following conclusions: 1. The crust in China was solidified pretty late; with the accretion of the plate, the copper mineralization moved towards its margin in space and became successively younger in age. 2. The major copper ore types ever found in the world have mostly been discovered in China, in which the porphyry type seems to be the most important and the massive sulfide type in the transitional bed between marine clastic and carbonate rocks is clearly defined. 3. Carbonate strata are widespread in China and their deposition lasted for a long geological period, so the proportion of copper deposits occurring in them is large as compared with other parts of the world. 4. Seven metallogenic epochs can be recognized, in which the Mesozoic one plays the leading role and the middle(late) Palaeozoic and Cenozoic ones are next in importance. Mineralization was comparatively simple in the early geological period. and became diversified later on. In the early epochs copper deposits related to basaltic magmatism and metamorphosed marine sediments predominated, whereas in the later epochs those related to granitic magmatism and continental sedimentation were dominant. 5. There exist in China thirteen metallogenic provinces, of which the Lower Yangtze downwarping belt, Sanjiang fold system, Jiangnan axis and Xikang-Yunnan axis are of greater significance. 6. The crustal mobility in China was rather pronounced, the polycyclic evolution of the crust has resulted in such obvious phenomena as the inheritance of mineralization, the coexistence of various types and the superposition of different genetic types. | Wang Zhitian and Qin Kezhang Beijing Institute of Geology for Mineral Resources, CNNC, Beijing Zhang Zhongmin | 1989 | Acta Geologica Sinica(English Edition)1989，63，1： | 5 |
| 4 | Cherishing Men from Afar:Qing Guest Ritual and the Macartney Embassy of 1793显示文摘 | James Hevia Luo Zhitian Nie Xiaohua Su Xuetao | 2000 | Social Sciences in China2000，21，2： | 4 |
| 5 | Electroluminescence performances of 1,1-bis(4-(N,N-dimethylamino)phenyl)-2,3,4,5-tetraphenylsilole based polymers in three cathode architectures显示文摘A new silole monomer with two 4-(N,N-dimethylamino)phenyl substitutions on silicon atom as designed and synthesized.Three copolymers PF-N-HPS1,PF-N-HPS10 and PF-N-HPS20 were then obtained by copolymerizations of 2,7-fluorene derivatives with the silole monomer at feed ratios of 1%,10%,and 20%.Their UV-vis absorption,electrochemical,photoluminescent,and electroluminescent (EL) properties were investigated.PF-N-HPS possessed HOMO levels of 5.25-5.58 eV,and showed green emissions.Using PF-N-HPS as the emissive layer,three different polymer light-emitting diodes were fabricated as device A with ITO/PEDOT/PF-N-HPS/Al,device B with ITO/PEDOT/PF-N-HPS/Ba/Al,and device C with ITO/PEDOT/PF-N-HPS/TPBI/Ba/Al.For the device A,PF-N-HPS only showed very low EL efficiency of 0.06-0.33 cd/A,indicating that the Al cathode could not inject electron efficiently to the emissive polymers containing the 4-(N,N-dimethylamino)phenyl groups.For the device B,low work function Ba supplied better electron injections,and the EL efficiency could be improved to 0.85-1.44 cd/A.TPBI with a deep HOMO level of 6.2 eV could enhance electron transport and hole blocking.Thus modified recombinations and largely elevated EL efficiency of 4.56-7.96 cd/A were achieved for the device C.The separation of the emissive layer and metal cathode with the TPBI layer may also suppress exciton quenching at the cathode interface. | LIU ZhiTian HU SuJun ZHANG LinHua CHEN JunWu PENG JunBiao CAO Yong | 2013 | Science China Chemistry2013，56，8： | 2 |
| 6 | Mean wind load induced incompatibility in nonlinear aeroelastic simulations of bridge spans显示文摘Mean wind response induced incompatibility and nonlinearity in bridge aerodynamics is discussed,where the mean wind and aeroelastic loads are applied simultaneously in time domain.A kind of incompatibility is found during the simultaneous simulation of the mean wind and aeroelastic loads,which leads to incorrect mean wind structural responses.It is found that the mathematic expectations (or Iimiting characteristics) of the aeroelastic models are fundamental to this kind of incompatibility.In this paper,two aeroelastic models are presented and discussed,one of indicial-function-denoted (IF-denoted) and another of rational-function-denoted (RF-denoted).It is shown that,in cases of low wind speeds,the IF-denoted model reflects correctly the mean wind load properties,and results in correct mean structural responses;in contrast,the RF-denoted model leads to incorrect mean responses due to its nonphysical mean properties.At very high wind speeds,however,even the IF-denoted model can lead to significant deviation from the correct response due to steady aerodynamic nonlinearity.To solve the incompatibility at high wind speeds,a methodology of subtraction of pseudo-steady effects from the aeroelastic model is put forward in this work.Finally,with the method presented,aeroelastic nonlinearity resulted from the mean wind response is investigated at both moderate and high wind speeds. | Zhitian ZHANG | 2019 | Frontiers of Structural and Civil Engineering2019，13，3： | 2 |
| 7 | Signal Clipping at Transmitter and Receiver of O-OFDM for VLC under Optical Power Constraint显示文摘Visible light communications(VLC)is considered as an effective supplement technology for next-generation(6G)communications due to its abundant spectrum,high power efficiency and easy deployment.Optical orthogonal frequency division multiplexing(O-OFDM)is a common technology to obtain further promotion.In this paper,two typical O-OFDM schemes direct current biased O-OFDM(DCO-OFDM)and asymmetrically clipped O-OFDM(ACO-OFDM)are analyzed in terms of signal clipping at both transmitter and receiver under the constraints of maximum optical power and non-negative optical power.And effective electrical SNR models after signal clipping are proposed and verified by link simulation.Then a noise cancellation scheme is proposed based on received signal clipping and is proved to bring a significant gain for ACO-OFDM.By system simulation,we find that under a certain optical power limitation,most users can achieve above 4 Gbps in indoor scenario when modulation bandwidth of the light emit diode(LED)or laser diode(LD)is 1 GHz.Therefore,it can be expected that the throughput could reach tens Gbps when the LED/LD modulation bandwidth is increased and multiple LEDs/LDs are deployed. | Liang Xia Xiaoqian Wang Zhiwen Sun Zhitian Cheng Jing Jin Yifei Yuan Guangyi Liu Tao Jiang Yuhong Huang | 2022 | China Communications2022，19，6： | 2 |
| 8 | Novel nondelay-based reservoir computing with a single micromechanical nonlinear resonator for high-efficiency information processing显示文摘Reservoir computing is a potential neuromorphic paradigm for promoting future disruptive applications in the era of the Internet of Things,owing to its well-known low training cost and compatibility with hardware.It has been successfully implemented by injecting an input signal into a spatially extended reservoir of nonlinear nodes or a temporally extended reservoir of a delayed feedback system to perform temporal information processing.Here we propose a novel nondelay-based reservoir computer using only a single micromechanical resonator with hybrid nonlinear dynamics that removes the usually required delayed feedback loop.The hybrid nonlinear dynamics of the resonator comprise a transient nonlinear response,and a Duffing nonlinear response is first used for reservoir computing.Due to the richness of this nonlinearity,the usually required delayed feedback loop can be omitted.To further simplify and improve the efficiency of reservoir computing,a self-masking process is utilized in our novel reservoir computer.Specifically,we numerically and experimentally demonstrate its excellent performance,and our system achieves a high recognition accuracy of 93%on a handwritten digit recognition benchmark and a normalized mean square error of 0.051 in a nonlinear autoregressive moving average task,which reveals its memory capacity.Furthermore,it also achieves 97.17±1%accuracy on an actual human motion gesture classification task constructed from a six-axis IMU sensor.These remarkable results verify the feasibility of our system and open up a new pathway for the hardware implementation of reservoir computing. | Jie Sun Wuhao Yang Tianyi Zheng Xingyin Xiong Yunfei Liu Zheng Wang Zhitian Li Xudong Zouu | 2021 | Microsystems & Nanoengineering2021，7，5： | 2 |
| 9 | Population control of the yellow-spined bamboo locust,Ceracris kiangsu,using urine-borne chemical baits in bamboo forest显示文摘 | YU Haiping SHEN Ke WANG Zhitian | 2011 | Entomologia Experimentalis et Applicata2011，138，1： | 1 |
| 10 | Second window of ischemic preconditioning regulates mitochondrial permeability transition pore by enhancing Bcl-2 expression显示文摘 | Rajesh KG Sasaguri S Zhitian Z | 2003 | Cardiovasc Res2003，59，2： | 1 |
| 11 | Imperialism in China: The Evolution of Treaty Regime from the Cultural Perspective显示文摘近代帝国主义实施侵华行为的中国当地条件制约或限定了侵略的方式和特性。外来侵略者通过条约体系内化为中国权势结构的一部分,又依“例外法则”在中国形成一套与西方基本价值观相冲突的思维和行为方式,故这些西方代表在中国表述着“西方”却又不完全等同于“西方”。列强既要中国实行改革以维持西方标准的“正常”秩序,又是与西方标准相异的中国秩序之构建者和维护者,扮演着改革推动者和既存秩序维护者的双重角色。 | Luo Zhitian Xiao Yun | 2005 | Social Sciences in China2005，26，1： | 1 |
| 12 | Second window of ischemic preconditioning regulates mitochondrial permeability transition pore by enhancing Bcl-2 expression显示文摘 | Rajesh K G Sasaguri S Zhitian Z | 2003 | Cardiovasc Res2003，59，2： | 1 |
| 13 | Indicial functions for bridge aeroelastic forces and time-domain flutter analysis显示文摘 | Zhang Zhitian Chen Zhengqing Cai Yiyong | 2011 | Journal of Bridge Engineering2011，16，4： | 1 |
| 14 | Second window of ischemic preconditioning regulates mitochondrial permeability transition pore by enhance Bcl-2 expression显示文摘 | RAJESH KG SASAGURI S ZHITIAN Z | 2003 | Cardiovase Res2003，59，2： | 1 |
| 15 | Second window of ischemic preconditioning regulates mitochondrial permeability transition pore by enhancing Bcl-2 expression显示文摘 | Rajesh KG Sasaguri S Zhitian Z | 2003 | Cardiovasc Res2003，59，2： | 1 |
| 16 | Second window of ischemic preconditioning regulates mitochondrial permeability transition pore by enhancing Bcl-2 expression显示文摘 | Sasaguri S Zhitian Z Suzuki R Asakai R Maeda H | 2003 | Cardiovasc Res2003，59，2： | 1 |
| 17 | Second window of ischemic preconditioning regulates mitochondrial permeability transition pore by enhancing Bcl -2 expression 显示文摘 | Rajesh KG Sasaguri S Zhitian Z | 2003 | Cardiovasc Res2003，59，2： | 1 |
| 18 | An empirical study of the Kuznets hypothesis and regional inequality in China显示文摘 | Yang Duogui Zhou Zhitian Chen Shaofeng | 2004 | Soft Science2004，18，1： | 1 |
| 19 | Second window of ischemic preconditioning regulates mitochondrial permeability transition pore by enhancing Bcl-2 expression显示文摘 | Rajesh K G Sasaguri S Zhitian Z | 2003 | Cardiovasc Res2003，59，2： | 1 |
| 20 | Biochemical changes during storage of sweet potato roots differing in dry matter content显示文摘 | Zhitian Zhang Christopher C. Wheatley Harold Corke | 2002 | Postharvest Biology and Technology2002，，3： | 1 |
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