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A metasurface-based light-to-microwave transmitter for hybrid wireless communications

Light(Science & Applications) 2022年第6期11卷 1139-1148页

作者： Xin Ge Zhang Ya Lun Sun Bingcheng zhu wei Xiang Jiang Qian Yu Han wei Tian Cheng-wei qiu Zaichen Zhang Tie Jun Cui State Key Laboratory of Millimeter Waves School of Information Science and EngineeringSoutheast University210096 NanjingChina National Mobile Communications Research Laboratory School of Information Science and EngineeringSoutheast University210096 NanjingChina Frontiers Science Center for Mobile Information Communication and Security Southeast University210096 NanjingChina Purple Mountain Laboratories 211111 NanjingChina Department of Electrical and Computer Engineering National University of SingaporeSingapore 117583Singapore

Signal conversion plays an important role in many applications such as communication,sensing,and *** signal conversion between optical and microwave frequencies is a crucial step to construct hybrid communication systems that combine both optical and microwave wireless technologies to achieve better features,which are highly desirable in the future wireless ***,such a signal conversion process typically requires a complicated relay to perform multiple operations,which will consume additional hardware/time/energy ***,we report a light-to-microwave transmitter based on the time-varying and programmable metasurface integrated with a high-speed photoelectric detection circuit into a *** a transmitter can convert a light intensity signal to two microwave binary frequency shift keying signals by using the dispersion characteristics of the metasurface to implement the frequency division *** illustrate the metasurface-based transmitter,a hybrid wireless communication system that allows dual-channel data transmissions in a light-to-microwave link is demonstrated,and the experimental results show that two different videos can be transmitted and received simultaneously and *** metasurface-enabled signal conversion solution may enrich the functionalities of metasurfaces,and could also stimulate new information-oriented applications.

关键词： microwave surface light

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A New Derivation of Standard Quantum Chromodynamics Evolution Equation

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Chinese Physics Letters 1999年第7期16卷 481-483页

作者： zhu wei Department of Physics East China Normal UniversityShanghai 200062

Standard evolution equation including virtual graphs is derived in time ordered perturbative *** propose a new cutting rule in deep inelastic scattering processes,which provides a useful tool for discussing the connec... 详细信息

关键词： equation. theory. ordered

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Effect of friction heat on tribological behavior of M2 steel against GCr15 steel in dry sliding systems

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Journal of University of Science and Technology Beijing 2007年第6期14卷 512-516页

作者： Ming qiu Yongzhen Zhang Jun zhu School of Mechatronic Engineering Henan University of Science and Technology Luoyang 471003 China Theory of Lubrication and Bearing Institute Xi＇an Jiaotong University Xi＇an 710049 China School of Material Science and Engineering Henan University of Science and Technology Luoyang 471003 China

The tribological behavior depends significantly on friction heat under high sliding velocity. Many factors influence the conduction rate of friction heat, such as thermophysical properties of the pairs, the formation components of interface-film, environment mediums, etc. Through theoretical and experimental studies on surface temperature, the heat partition approaches have been applied to the pairs of M2 steel against GCr 15 steel to compare and discuss their tribological behavior in dry sliding contact. The results indicate that the values of the contact pressure have little effect on the heat partition at a high sliding velocity of 40 m/s. Furthermore, the degree of correlation between the dynamic temperature and friction coefficient is obvious, and the correlation degree of parameters increases as the pressure grows. A close correlation exists among the temperatures measured from different points of the pin specimen. At last, X-ray diffraction analysis denotes that the carbides of secondary M6C are separated out during the process of friction.

关键词： heat partition contact temperature dry friction dynamic temperature

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Synthesis and adsorption performance of lead ion-imprinted micro-beads with combination of two functional monomers

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Journal of Environmental Sciences 2011年第12期23卷 1955-1961页

作者： Linyan zhu Zhiliang zhu Ronghua Zhang Jun Hong Yanling qiu State Key Laboratory of Pollution Control and Resource Reuse Tongji University Shanghai 200092 China Department of Chemistry Tongji University Shanghai 200092 China Key Laboratory of Yangtze River Water Environment Ministry of Education of China Shanghai 200092 China

A novel ion-imprinted polymer, lead ion-imprinted micro-beads with combination of two functional monomers, was synthesized using the W/O/W polymerization method. Two functional monomers, 1,12-dodecanediol-O,O’-diphenyl-phosphonic acid （DDDPA） and 4-vinylpyridine, were used to form a suitable construction with micro-pores fitting the template and recognition sites. The eflects of adsorbent dosage, solution pH and the competitive ions on the adsorption and separation eflciency of lead ions were investigated. The lead ion-imprinted micro-beads were eflcient for lead ions removal from aqueous solution in a broad pH range （4–9）, when the adsorbent dosage was above 0.1 g/L. The adsorption process obeyed the pseudo second-order kinetics model and it only took half an hour to reach the equilibrium. The adsorption isotherm of lead ion was described by the Langmuir model （R2 0.99） with a maximum adsorption capacity of 116.9 mg/g. In the presence of competitive ions Co2＋ and Cd2＋, the lead ion-imprinted micro-beads showed a high selectivity for lead ions. The selectivity coeficient of Pb2＋/Cd2＋ and Pb2＋/Co2＋are 99.3 and 114.7, respectively.

关键词： lead ions adsorption lead ion-imprinted micro-beads selective separation recognition

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Sign-based Test for Mean Vector in High-dimensional and Sparse Settings

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Acta Mathematica Sinica,English Series 2020年第1期36卷 93-108页

作者： wei LIU Ying qiu LI College of Mathematics and Statistics Hu'nan University of Finance and EconomicsChangsha 410205P.R.China School of Mathematics and Statistics Changsha University of Science and TechnologyChangsha 410114P.R.China

In this article, we introduce a robust sparse test statistic which is based on the maximum type statistic. Both the limiting null distribution of the test statistic and the power of the test are analysed. It is shown that the test is particularly powerful against sparse alternatives. Numerical studies are carried out to examine the numerical performance of the test and to compare it with other tests available in the literature. The numerical results show that the test proposed significantly outperforms those tests in a range of settings, especially for sparse alternatives.

关键词： High-dimensional data maximum type test sign-based dense test sign-based sparsity test sum of squares type test testing mean vector

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Electroacupuncture Attenuates Immune-Inflammatory Response in Hippocampus of Rats with Vascular Dementia by Inhibiting TLR4/MyD88 Signaling Pathway

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Chinese Journal of Integrative Medicine 2022年第2期28卷 153-161页

作者： BU Yu LI Wen-shuang LIN Ji wei Yu-wei SUN qiu-ying zhu Shi-jie TANG Zhong-sheng School of Basic Medicine Guizhou University of Traditional Chinese MedicineGuiyang(550025)China Department of Hematology the Second Affiliated Hospital of Guizhou University of Traditional Chinese MedicineGuiyang(550025)China

Objective:To investigate whether electroacupuncture(EA)alleviates cognitive impairment by suppressing the toll-like receptor 4(TLR4)/myeloid differentiation factor 88(MyD88)signaling pathway,which triggers immune-inflammatory responses in the hippocampus of rats with vascular dementia(VaD).Methods:The experiments were conducted in 3 parts and in total the Sprague-Dawley rats were randomly divided into 8 groups by a random number table,including sham,four-vessel occlusion(4-VO),4-VO+EA,4-VO+non-EA,sham+EA,4-VO+lipopolysaccharide(LPS),4-VO+LPS+EA,and 4-VO+TAK-242 *** VaD model was established by the 4-VO *** days later,rats were treated with EA at 5 acupoints of Baihui(DV 20),Danzhong(RN 17),Geshu(BL 17),Qihai(RN 6)and Sanyinjiao(SP 6),once per day for 3 consecutive *** subsets,lymphocyte transformation rates,and inflammatory cytokines interleukin-6(IL-6)and tumor necrosis factorα(TNF-α)were measured to assess immune function and inflammation in VaD *** electron microscopy was used to observe the ultrastructure of nerve cells in the *** levels of TLR4,MyD88,IL-6,and TNF-αwere detected after EA ***4/MyD88 signaling and cognitive function were also assessed after intracerebroventricular injection of TLR4 antagonist TAK-242 or TLR4 agonist LPS with or without ***:Compared with the 4-VO group,EA notably improved immune function of rats in the 4-VO+EA group,inhibited the protein and mRNA expressions of TLR4 and MyD88 in the hippocampus of rats,reduced the expressions of serum IL-6 and TNF-α(all P0.05).Conclusions:EA attenuated cognitive impairment associated with immune inflammation by inhibition of the TLR4/MyD88 signaling ***,EA may be a promising alternative therapy for the treatment of VaD.

关键词： electroacupuncture vascular dementia immune-inflammation toll-like receptor 4/myeloid differentiation factor 88 signaling pathway

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On the Regularity Theories for Harmonic Maps from Finsler Manifolds

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Chinese Annals of Mathematics,Series B 2012年第4期33卷 595-600页

作者： wei zhu Department of Mathematics Zhejiang University Hangzhou 310027 China.

The author studies the regularity of energy minimizing maps from Finsler manifolds to Riemannian manifolds. It is also shown that the energy minimizing maps are smooth, when the target manifolds have no focal points.

关键词： Finsler manifolds Harmonic map Regularity

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Laminar Flow in the Gap between Two Rotating Parallel Frictional Plates in Hydro-viscous Drive

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Chinese Journal of Mechanical Engineering 2012年第1期25卷 144-152页

作者： HUANG Jiahai wei Jianhua qiu Minxiu The State Key Lab of Fluid Power Transmission and Control Zhejiang UniversityHangzhou 310027China

The velocity, pressure and temperature distributions of the flow in the gap between hydro-viscous drive friction disks are the key parameters in the design of hydro-viscous drive and angular velocity controller. In the previous works dealing with the flow in the gap between disks in hydro-viscous drive, few authors considered the effect of Coriolis force on the flow. The object of this work is to investigate the flow with consideration of the effects of centrifugal force, Coriolis force and variable viscosity. A simplified mathematical model based on steady and laminar flow is presented. An approximate solution to the simplified mathematical model is obtained by using the iteration method assuming that the fluid viscosity remains constant. Then the model considering the effect of variable viscosity is solved by means of computational fluid dynamics code FLUENT. Numerical results of the flow are obtained. It is found that radial velocity profile diverges from the ideal parabolic curve due to inertial forces and tangential velocity profile is nonlinear due to Coriolis force, and pressure has two possible solution branches. In addition, it is found that variable viscosity plays an important role on pressure profiles which are significantly different from those of fluid with constant viscosity. The experimental device designed for this work consists of two disks, and one of them is fixed. Experimental pressure and temperature of the flow within test rig are obtained. It is shown that the trend of numerical results is in agreement with that of experimental ones. The research provides a theoretical foundation for hydro-viscous drive design.

关键词： hydro-viscous drive rotating disks flow inertial force viscosity-temperature characteristics

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Some results on P-harmonic maps and exponentially harmonic maps between Finsler manifolds

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Applied Mathematics(A Journal of Chinese Universities) 2010年第2期25卷 236-242页

作者： zhu wei Department of Mathematics Zhejiang University Hangzhou 310027 China

This paper studies the stability of P-harmonic maps and exponentially harmonic maps from Finsler manifolds to Riemannian manifolds by an extrinsic average variational method in the calculus of variations. It generaliz... 详细信息

关键词： Finsler manifolds stable P-harmonic maps exponentially harmonic maps.

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Trigonometric WENO Schemes for Hyperbolic Conservation Laws and Highly Oscillatory Problems

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Communications in Computational Physics 2010年第10期8卷 1242-1263页

作者： Jun zhu Jianxian qiu College of Science Nanjing University of Aeronautics and AstronauticsNanjingJiangsu 210016China Department of Mathematics Nanjing UniversityNanjingJiangsu 210093China

In this paper,we use trigonometric polynomial reconstruction,instead of algebraic polynomial reconstruction,as building blocks for the weighted essentially non-oscillatory(WENO)finite difference schemes to solve hyperbolic conservation laws and highly oscillatory *** goal is to obtain robust and high order accurate solutions in smooth regions,and sharp and non-oscillatory shock *** results are provided to illustrate the behavior of the proposed schemes.

关键词： TWENO scheme hyperbolic conservation laws highly oscillatory problem finite difference scheme

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