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Journal of Traditional Chinese Medicine 2016年第4期36卷 450-455页

作者： Hou Lili xu Lei shi Yan Gu fen Department of Nursing Shanghai Pulmonary Hospital Department of Nursing Putuo HospitalShanghai University of Traditional Chinese Medicine Department of Nursing Tenth People's Hospital of Tongji University Respiratory Department Shanghai Pulmonary Hospital

OBJECTIVE:To evaluate the effects of electric acupoint stimulation on gastrointestinal hormones and motility among geriatric postoperative patients with gastrointestinal tumors,and to explore an efficient and noninvasive method for postoperative recovery of bowel ***:Forty patients were randomly and evenly assigned into a regular nursing care group(RNC) and an acupoint electric stimulation group(AES).Patients in the RNC group received regular nursing care and patients in the AES group received regular nursing care plus electric stimulation of *** serum levels of gastrin(GAS),motilin(MOT),and cholecystokinin(CCK),and an electrogastrogram(EGG) of all the patients were evaluated on the first,third,and fifth day after *** time to first flatus after surgery and the number of patients with side effects such as abdominal pain,abdominal distention,and diarrhea were ***:There were significant differences between the two groups in GAS,MOT,EGG,time to first flatus,abdominal pain,abdominal distention,and diarrhea(P < 0.05).CONCLUSION:Electric stimulation on acupoints could increase levels of GAS and MOT,promote the recovery of gastrointestinal functions,and decrease complications among postoperative senile patients with gastrointestinal tumors.

关键词： Electric stimulation therapy Aged Gas trointestinal stromal tumors Gastrointestinal hor mones Gastrointestinal motility Point ST36(Zusan li) Point ST37(Shangjuxu)

Topological Structure of Phase Vortex in Resonating Valence Bond Superconductivity

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Communications in Theoretical Physics 2006年第1X期46卷 33-36页

作者： shi xu-Guang DUAN Yi-shi College of Basic Science and Technology Beijing Forestry University Beijing 100083 China Institute of Theoretical Physics Lanzhou University Lanzhou 730000 China

In this paper, based on the Schrfdinger equation and the ψ mapping theory, the accurate expression for the gradient of resonating valence bond superconducting phase Θ^2s is found. The expression of Δ↓Θ^2s is just the velocity flow without considering the coefficient. The curl of Δ↓Θ^2s is where the vortex lies, and has important relation to δ2（ψ） and an important relation to the zero points of resonating valence bond superconducting order parameter ψ. The topological structure of the vortex is characterized by the ψ-mapping topological numbers Hopf-index and Brouwer degrees. The Ginzberg-Landau equation in resonating valence bond state also is discussed in this theory. The magnetic property is discussed also.

关键词： ψ-mapping theory phase vortex GL-equation RVB superconductivity

Silicon-based on-chip diplexing/triplexing technologies and devices

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Science China(Information Sciences) 2018年第8期61卷 18-32页

作者： Yaocheng shi Jingye CHEN Hongnan xu Centre for Optical and Electromagnetic Research State Key Laboratory of Modern Optical InstrumentationZhejiang University

Wavelength-division-multiplexing(WDM) transceiver filters are one of the most essential components for realizing the fiber-to-the-home(FTTH) networks. In recent years, silicon photonics have provided a very attractive platform to build ultra-compact photonic integrated devices with CMOS-compatible processes. In this review, we focus on the recent progresses on diplexers/triplexers based on multimode interference couplers(MMI), and directional couplers(DC). The polarization-insensitive devices are also discussed.

关键词： wavelength division multiplexer multimode interference coupler directional coupler fiber-tothe-home silicon waveguide

Reversible spiking neural P systems

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Frontiers of Computer Science 2013年第3期7卷 350-358页

作者： Tao SONG Xiaolong shi Jinbang xu Key Laboratory of Image Processing and Intelligent Control Department of Control Science and Engineering Huazhong University of Science and Technology Wuhan 430074 China

Spiking neural （SN） P systems are a class of distributed parallel computing devices inspired by the way neurons communicate by means of spikes. In this work, we investigate reversibility in SN P systems, as well as the computing power of reversible SN P systems. Reversible SN P systems are proved to have Turing creativity, that is, they can compute any recursively enumerable set of non-negative integers by simulating universal reversible register machine.

关键词： membrane computing spiking neural P system reversible computing model universality reversible register machine

A new streamline diffusion finite element method for the generalized Oseen problem

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Applied Mathematics and Mechanics(English Edition) 2018年第2期39卷 291-304页

作者： Chao xu Dongyang shi Xin LIAO Faculty of Mathematics and Physics Education Luoyang Institute of Science and Technology School of Mathematics and Statistics Zhengzhou University

This paper aims to present a new streamline diffusion method with low order rectangular Bernardi-Raugel elements to solve the generalized Oseen equations. With the help of the Bramble-Hilbert lemma, the optimal errors of the velocity and pressure are estimated, which are independent of the considered parameter e. With an interpolation postprocessing approach, the superconvergent error of the pressure is obtained. Finally, a numerical experiment is carried out to confirm the theoretical results.

关键词： streamline diffusion method Bernardi-Raugel element Oseen problem,superconvergent error estimate

骨桥蛋白和p38MAPK信号通路在多房棘球蚴原头节发育中的作用

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动物医学进展 2025年第1期46卷 9-15页

作者：徐刚毛艺胡帅葛宇飞徐志张玉梦谢士伟张宏伟张示杰石河子大学第一附属医院新疆石河子832000 石河子大学医学院新疆石河子832000

为明确骨桥蛋白(OPN)和多房棘球蚴(Echinococcus multilocularis,Em)p38丝裂原活化蛋白激酶(p38MAPK)信号通路在Em发育过程的作用,剖检感染Em 4~6月的长爪沙鼠,提取Em原头节后,分别用不同浓度的p38MAPK抑制剂(SB202190)处理Em原头节,选... 详细信息

为明确骨桥蛋白(OPN)和多房棘球蚴(Echinococcus multilocularis,Em)p38丝裂原活化蛋白激酶(p38MAPK)信号通路在Em发育过程的作用,剖检感染Em 4~6月的长爪沙鼠,提取Em原头节后,分别用不同浓度的p38MAPK抑制剂(SB202190)处理Em原头节,选取合适的SB202190浓度后在体外将原头节分为DMSO组、anti-p38MAPK组、PBS组、OPN组、OPN+anti-p38MAPK组,采用伊红染色、caspase-3试剂盒检测caspase-3、EDU和Hoechst染色、活性氧(ROS)检测探针检测原头节的活性、凋亡和增殖情况。结果显示,抑制Em的SB202190适宜浓度为20μmol/L,SB202190增加Em的伊红染色率、caspase-3水平,减少EDU阳性、ROS水平,OPN可减少Em伊红染色率、caspase-3水平,增加EDU阳性率、ROS水平,且SB202190可逆转OPN对Em的结果,这些结果表明SB202190可抑制Em的活性和增殖、促进凋亡并与浓度正相关,而OPN可促进Em的活性和增殖、抑制凋亡,且SB202190可逆转OPN对Em的作用。研究结果为OPN和p38MAPK信号通路可能成为治疗多房棘球蚴病的新分子靶点提供证据。

关键词：多房棘球蚴多房棘球蚴病骨桥蛋白 p38丝裂原活化蛋白激酶

High-resolution simulation for rotorcraft aerodynamics in hovering and vertical descending flight using a hybrid method

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Chinese Journal of Aeronautics 2018年第5期31卷 1053-1065页

作者： Liangquan WANG Guohua xu Yongjie shi National Key Laboratory of Science and Technology on Rotorcraft Aeromeehanics Nanjing University of Aeronautics and Astronautics Nanjing 210016 China

A high-resolution simulation tool for rotorcraft aerodynamics is developed by coupling CFD with a Vorticity Transport Model（VTM）. An Eulerian-based CFD module is used to model the blade near body flowfield, and a Lagrangian-based VTM module is employed for vortex tracking in the far wake. The coupling procedure is implemented by transmitting vortex sources to the VTM module and feeding boundary conditions back to the CFD module. The presented CFD/VTM hybrid solver is firstly validated by hover cases of three different rotor configurations. Simulation results, including the blade surface pressure distribution, rotor downwash, and hover figure of merit, exhibit favorable correlations with available experimental data. Then, a rotor operated in vertical descending flight with a fixed collective pitch is investigated. It is shown that the CFD/VTM coupling method is suitable for rotor wake simulation. Wake instabilities（far wake breakdown in hover and toroidal wake pattern in the vortex ring state） are successfully demonstrated with a moderate computational cost.

关键词： Descending flight Hybrid method Rotorcraft Vortex ring state Vorticity transport model

Efficient prediction of ground noise from helicopters and parametric studies based on acoustic mapping

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Chinese Journal of Aeronautics 2018年第2期31卷 273-284页

作者： Fei WANG Guohua xu Yongjie shi National Key Laboratory of Rotorcraft Aeromechanics Nanjing University of Aeronautics and Astronautics

Based on the acoustic mapping, a prediction model for the ground noise radiated from an in-flight helicopter is established. For the enhancement of calculation efficiency, a high-efficiency second-level acoustic radiation model capable of taking the influence of atmosphere absorption on noise into account is first developed by the combination of the point-source idea and the rotor noise radiation characteristics. The comparison between the present model and the direct computation method of noise is done and the high efficiency of the model is validated. Rotor free-wake analysis method and Ffowcs Williams-Hawkings（FW-H） equation are applied to the aerodynamics and noise prediction in the present model. Secondly, a database of noise spheres with the characteristic parameters of advance ratio and tip-path-plane angle is established by the helicopter trim model together with a parametric modeling approach. Furthermore, based on acoustic mapping, a method of rapid simulation for the ground noise radiated from an in-flight helicopter is developed. The noise footprint for AH-1 rotor is then calculated and the influence of some parameters including advance ratio and flight path angle on ground noise is deeply analyzed using the developed *** results suggest that with the increase of advance ratio and flight path angle, the peak noise levels on the ground first increase and then decrease, in the meantime, the maximum Sound Exposure Level（SEL） noise on the ground shifts toward the advancing side of rotor. Besides, through the analysis of the effects of longitudinal forces on miss-distance and rotor Blade-Vortex Interaction（BVI） noise in descent flight, some meaningful results for reducing the BVI noise on the ground are obtained.

关键词： Acoustic mapping Helicopter Noise footprint Rotor noise Second-level acoustic radiation model

Perceptual importance analysis for H.264/AVC bit allocation

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2008年第2期9卷 225-231页

作者： Gui-xu LIN shi-bao ZHENG Institute of lmage Comm. ＆ Info. Processing Dept. of Electronic Engineering Shanghai Jiao Tong University Shanghai 200240 China Shanghai Key Laboratory of Digital Media Processing and Transmissions Shanghai Jiao Tong University Shanghai 200240 China

The existing H.264/AVC rate control schemes rarely include the perceptual *** a result,the im-provements in visual quality are hardly comparable to those in peak signal-to-noise ratio(PSNR).In this paper,we propose a perceptual importance analysis scheme to accurately abstract the spatial and temporal perceptual characteristics of video *** we perform bit allocation at macroblock(MB)level by adopting a perceptual mode decision scheme,which adaptively updates the Lagrangian multiplier for mode decision according to the perceptual importance of each *** results show that the proposed scheme can efficiently reduce bit rates without visual quality degradation.

关键词： Visual quality Human visual system Rate control H.264/AVC

Sparse Bayesian Learning Based Off-Grid Estimation of OTFS Channels with Doppler Squint

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TSINGHUA SCIENCE AND TECHNOLOGY 2024年第6期29卷 1821-1828页

作者： Wang, xuehan shi, xu Wang, Jintao Tsinghua Univ Dept Elect Engn Beijing 100084 Peoples R China

Orthogonal Time Frequency Space (OTFS) modulation has exhibited significant potential to further promote the performance of future wireless communication networks especially in high-mobility scenarios. In practical OTFS systems, the subcarrier-dependent Doppler shift which is referred to as the Doppler Squint Effect (DSE) plays an important role due to the assistance of time-frequency modulation. Unfortunately, most existing works on OTFS channel estimation ignore DSE, which leads to severe performance degradation. In this letter, OTFS systems taking DSE into consideration are investigated. Inspired by the input-output analysis with DSE and the embedded pilot pattern, the sparse Bayesian learning based parameter estimation scheme is adopted to recover the delay-Doppler channel. Simulation results verify the excellent performance of the proposed off-grid estimation approach considering DSE.

关键词： Channel estimation Symbols OFDM Estimation Time-frequency analysis Delays Bayes methods orthogonal time frequency space modulation Doppler squint effect channel estimation sparse Bayesian learning