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Gastrointestinal symptoms in patients undergoing peritoneal dialysis: Multivariate analysis of correlated factors

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World Journal of Gastroenterology 2010年第22期16卷 2812-2817页

作者： Dong, Rui guo, zhi-Yong Second Mil Med Univ Changhai Hosp Dept Nephrol Shanghai 200433 Peoples R China

AIM: To investigate gastrointestinal (GI) symptoms in peritoneal dialysis (PD) patients and to explore related factors contributing to GI symptoms. METHODS: One hundred and twelve patients undergoing PD participated in the study. The gastrointestinal symptom rating scale was used for measuring GI symptoms. Information on age, height, weight, body mass index, disease leading to chronic renal failure, history of corticosteroid therapy, presence of predialytic GI symptoms, daily dosage of pills, and duration, type and daily dialysate volume of PD was obtained by interviewing patients and/or reviewing the medical records. Hemoglobin, albumin and Kt/V data were obtained from follow-up database. We used multiple regression analysis with stepwise backward variable selection to test for factors predicting GSRS scores with significance level of selection entry at 0.05 and selection of stay at 0.10. RESULTS: The prevalence of eating dysfunction, reflux and indigestion in the PD patients was 44.2%, 32.7%,32.7%, respectively. A history of corticosteroid therapy (b = 8.93, P 0.05. CONCLUSION: Eating dysfunction, reflux and indigestion were common in PD patients. Daily dosage of pills and corticosteroid history predicted GI symptoms, while residual renal function prevented them.

关键词： Eating dysfunction Gastroesophageal reflux Dyspepsia Peritoneal dialysis Residual renal function

Printing and electromagnetic characteristics of 3D printing frequency selective surface using graphene

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Journal of Materials Science & Technology 2022年第16期111卷 49-56页

作者： guo-Xiang Zhou Zhe Zhao Yan-zhao Zhang Wen-jin Liu zhi-Hua Yang De-chang Jia Yu Zhou Key Laboratory of Advanced Structural-Functional Integration Materials&Green Manufacturing Technology Harbin Institute of TechnologyHarbin 150001China Institute for Advanced Ceramics School of Materials Science and EngineeringHarbin Institute of TechnologyHarbin 150080China State Key Laboratory of Advanced Welding and Joining Harbin Institute of TechnologyHarbin 150080China

The study of Frequency Selective Surface(FSS)by Direct ink writing(DIW)has attracted much attention due to the convenience and effectiveness of 3D printing ***,the limited printing precision of DIW has heavily restricted its applications as the electromagnetic performance is highly sensitive to it,especially the precision at the ***,the ultra-high printing precision of FSS was achieved through DIW by the uniformly dispersed graphene sheets to deeply modify the rheological behavior and the steric hindrance ***,the highly precision of the printed filament width as thin as67μm with a space of only 42μm were achieved,which is difficult for conventional DIW,and no structural distortion is found after 3D printing,no matter it was 2D printed on a flat surface or the sharply skewed hook face,or even 3D printed to architectural *** to the highly improved precision,the electromagnetic performance matching between the designed model and the printed physical FSS device was perfectly achieved,reducing the center frequency error less than 0.3 GHz,and the transmission coefficient error less than *** work promises an effective and easy preparation of high-quality FSS from the aid of graphene.

关键词： Graphene 3D printing Rheological Precision Frequency selective surface

Adhesion and stress-enhanced elastocaloric effect in graphene

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Science China(Technological Sciences) 2020年第2期63卷 297-302页

作者： LI Meng guo ZhengRong chang TienChong Shanghai Institute of Applied Mathematics and Mechanics Shanghai Key Laboratory of Mechanics in Energy EngineeringShanghai UniversityShanghai 200072China

Given its extraordinary properties, graphene has continued to attract significant attention since it was discovered. A recent study(Lisenkov, Nano Lett, 2016) revealed that graphene has a remarkable elastocaloric effect(ECE), which makes it a promising cooling material in nanoscale cooling systems. Here using molecular dynamics simulations we demonstrate that the elastocaloric effect of graphene layers can be significantly enhanced by adhesion and the application of lateral strain, i.e., orthogonal to the loading direction. The elastocaloric coefficient of graphene can be changed from 0 to 0.1 K/GPa when the graphene layer is adhered to a substrate or with the application of a small lateral strain. With such a remarkable feature, graphene could have a number of promising applications in cooling devices based on the caloric effect, and this study was conducted to understand the ECE in graphene better.

关键词： graphene elastocaloric effect adhesion uniaxial strain

PIV analysis and high-speed photographic observation of cavitating flow field behind circular multi-orifice plates

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Water Science and Engineering 2020年第2期13卷 145-153页

作者： zhi-ping guo Xi-huan Sun zhi-yong Dong College of Hydro-Science and Engineering Taiyuan University of TechnologyTaiyuan 030024China Department of Transportation Engineering Shanxi Conservancy Technical InstituteYuncheng 044004China College of Civil Engineering and Architecture Zhejiang University of TechnologyHangzhou 310014China

Based on a self-developed hydrodynamic cavitation device with different geometric parameters for circular multi-orifice plates,turbulence characteristics of cavitating flow behind multi-orifice plates,including the effects of orifice number and orifice layout on longitudinal velocity,turbulence intensity,and Reynolds stress,were measured with the particle image velocimetry(PIV)*** regimes of the cavitating flow were also observed with high-speed *** experimental results showed the following:(1)high-velocity multiple cavitating jets occurred behind the multi-orifice plates,and the cavitating flow fields were characterized by topological structures;(2)the longitudinal velocity at each cross-section exhibited a sawtooth-like distribution close to the multi-orifice plate,and each sawtooth indicated one jet issuing from one orifice;(3)there were similar magnitudes and forms for the longitudinal and vertical turbulence intensities at the same cross-section;(4)the variation in amplitude of Reynolds stress increased with an increase in orifice number;and(5)the cavitation clouds in the flow fields became denser with the increase in orifice number,and the clouds generated by the staggered layout of orifices were greater in number than those generated by the checkerboard-type one for the same orifice *** experimental results can be used to analyze the mechanism of killing pathogenic microorganisms through hydrodynamic cavitation.

关键词： Cavitating flow Circular multi-orifice plate PIV technique High-speed photography Turbulence characteristics

Photo-induced deep aerobic oxidation of alkyl aromatics

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Science China Chemistry 2021年第9期64卷 1487-1492页

作者： chang-Cheng Wang guo-Xiang Zhang zhi-Wei Zuo Rong Zeng Dan-Dan Zhai Feng Liu Zhang-Jie Shi Department of Chemistry Fudan UniversityShanghai200438China Department of Chemistry Xi’an Jiaotong UniversityXi’an710049China State Key Laboratory of Organometallic Chemistry Shanghai Institute of Organic ChemistryShanghai200032China

Oxidation is a major chemical process to produce oxygenated chemicals in both nature and the chemical ***,the industrial manufacture of benzoic acids and benzene polycarboxylic acids(BPCAs)is mainly based on the deep oxidation of polyalkyl benzene,which is somewhat suffering from environmental and economical disadvantage due to the formation of ozone-depleting Me Br and corrosion hazards of production *** this report,photo-induced deep aerobic oxidation of(poly)alkyl benzene to benzene(poly)carboxylic acids was ***_(3) was proved to be an efficient HAT(hydrogen atom transfer)catalyst in the presence of alcohol as both hydrogen and electron ***(O_(2))was found as a sole terminal *** most cases,pure products were easily isolated by simple filtration,implying large-scale implementation *** reaction provides an ideal protocol to produce valuable fine chemicals from naturally abundant petroleum feedstocks.

关键词： photo-induced oxidation alkyl aromatics

Exploration on 2D DOA Estimation of Linear Array Motion:Uniform Linear Motion

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China Communications 2023年第11期20卷 78-95页

作者： Jianhong Chu zhi Zhang Yu guo School of Information and Communication Engineering Beijing University of Posts and TelecommunicationsBeijing 100876China State Key Laboratory of Networking and Switching Technology Beijing University of Posts and TelecommunicationsBeijing 100876China

Generally,due to the limitation of the dimension of the array aperture,linear arrays cannot achieve two-dimensional(2D)direction of arrival(DOA)*** the emergence of array motion provides a chance for *** this paper,a generalized motion scheme and a novel method of 2D DOA estimation are proposed by exploring the linear array *** be specific,the linear arrays are controlled to move along an arbitrary direction at a constant velocity and snap per fixed time *** the received signals are processed to synthesize the comprehensive observation vector for an extended 2D virtual ***,since most of 2D DOA estimation methods are not universal to our proposed motion scheme and the reduced-dimensional(RD)method fails to handle the case of the coupled parameters,a decoupled reduced-complexity multiple signals classification(DRC MUSIC)algorithm is designed *** results demonstrate that:a)our proposed scheme can achieve underdetermined 2D DOA estimation just by the linear arrays;b)our designed DRC MUSIC algorithm has the good properties of high accuracy and low complexity;c)our proposed motion scheme with the DRC method has better universality in the motion direction.

关键词： 2D DOA estimation linear array motion reduced complexity synthetic aperture

Intelligent Chinese Medicine:A New Direction Approach for Integrative Medicine in Diagnosis and Treatment of Cardiovascular Diseases

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Chinese Journal of Integrative Medicine 2023年第7期29卷 634-643页

作者： WANG Zi-yan guo zhi-hua The First Clinical College of Chinese Medicine Hunan University of Chinese MedicineChangsha410208China School of Traditional Chinese Medicine Hunan University of Chinese MedicineChangsha410208China Hunan Key Laboratory of Colleges and Universities of Intelligent Traditional Chinese Medicine Diagnosis and Preventive Treatment of Chronic Diseases of Hunan Universities of Chinese Medicine Changsha410208China

High mortality rates from cardiovascular diseases(CVDs)persist *** people are at a higher risk of developing these *** the current high treatment cost for CVDs,there is a need to prevent CVDs and or develop treatment *** and Chinese medicines have been used to treat ***,several factors,such as inaccurate diagnoses,non-standard prescriptions,and poor adherence behavior,lower the benefits of the treatments by Chinese medicine(CM).Artificial intelligence(AI)is increasingly used in clinical diagnosis and treatment,especially in assessing efficacy of CM in clinical decision support systems,health management,new drug research and development,and drug efficacy *** this study,we explored the role of AI in CM in the diagnosis and treatment of CVDs,and discussed application of AI in assessing the effect of CM on CVDs.

关键词： Chinese medicine Western medicine artificial intelligence cardiovascular diseases ischemic heart disease heart failure

Magnetic properties of Nd_2Fe_(14)B/α-Fe nanocomposite magnets with yttrium addition

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Rare Metals 2010年第3期29卷 265-269页

作者： CHEN zhi'an SUI Yanli guo zhimeng Institute of Powder Metallurgy University of Science and Technology Beijing Beijing 100083 China State Key Laboratory for Advanced Metals and Materials University of Science and Technology Beijing Beijing 100083 China

The phase evolution and magnetic properties of Nd9？xYxFe72Ti2Zr2B15 （x = 0,0.5,1,and 2） melt-spun nanocomposite ribbons were *** is found that Y addition not only enhances the formability of amorphous phase in the alloy,but also stabilizes the amorphous phase during the annealing *** appropriate content of Y addition effectively enhances the remanence （Jr） of the annealed *** residual amorphous intergranular phase in the annealed sample optimizes the squareness of the loop,resulting in an larger maximum energy product （BH）*** best magnetic properties,Jr = 0.78 T,Hci （coercivity） = 923.4 kA/m,and （BH）max = 98.5 kJ/m3,were obtained from the Nd8YFe72Ti2Zr2B15 ribbon spun at Vs = 4 m/s and annealed at 700°C for 10 min,which is composed of Nd2Fe14B,α-Fe,and amorphous phase.

关键词： magnetic properties nanocomposite yttrium addition formability amorphous phase

A Local Tb Theorem for Square Functions and Parabolic Layer Potentials

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Acta Mathematica Sinica,English Series 2024年第8期40卷 1941-1966页

作者： zhi Dan WANG guo Ming ZHANG School of Physical and Mathematical Sciences Nanjing Tech UniversityNanjing 211816P.R.China Frontiers Science Center for Nonlinear Expectations Ministry of EductionResearch Center for Mathematics and Interdisciplinary SciencesShandong UniversityQingdao266237P.R.China

In this paper,we give a locally parabolic version of Tb theorem for a class of vector-valued operators with off-diagonal decay in L^(2) and certain quasi-orthogonality on a subspace of L^(2),in which the testing functions themselves are also *** an application,we establish the boundedness of layer potentials related to parabolic operators in divergence form,defined in the upper half-space Rn+2+:={(x,t,λ)∈R^(n+1)×(0,∞)},with uniformly complex elliptic,L^(∞),t,λ-independent coefficients,and satisfying the De Giorgi/Nash estimates.

关键词： Local Tb theorems Calderon-Littlewood-Paley family Parabolic layer potentials Carleson measure estimates