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Dependence of domain wall structures on repetition n in[Pt(0.5 nm)/Co(0.4 nm)]_n/NiO(1.1 nm)/[Co(0.4 nm)/Pt(0.5 nm)]_n multilayers

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International Journal of Minerals,Metallurgy and Materials 2010年第2期17卷 229-233页

作者： xiao-xia Li Gang Han Experimental Center College of Science Yanshan University Qinhuangdao 066004 China School of Materials Science and Engineering University of Science and Technology Beijing Beijing 100083 China

The magnetic force microscopy and a sample vibrating magnetometer have been used to investigate the domain structure in two antiferromagnetically coupled Co/Pt *** the antiferromagnetic coupled[Pt（0.5 nm）/Co（0.4 nm）]n/NiO（1.1 nm）/[Co（0.4 nm）/Pt（0.5 nm）]n multilayers with perpendicular anisotropy,the antiferromagnetic interlayer coupling strength increases linearly with the repetition number n in Co/Pt *** demagnetized states,relatively shifted domain walls in the two Co/Pt multilayers are observed,with net ferromagnetic stripes formed between them for the repetition number n less than 5,and the stripe width decreases with the increase of *** occurrence of these features can be attributed to the competition between the interlayer coupling and magnetostatic energies.

关键词： perpendicular anisotropy antiferromagnets interlayer coupling domain walls magnetostatic energy

Cross Project Defect Prediction via Balanced Distribution Adaptation Based Transfer Learning

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Journal of Computer Science & Technology 2019年第5期34卷 1039-1062页

作者： Zhou Xu Shuai Pang Tao Zhang xia-Pu Luo Jin Liu Yu-tian Tang xiao Yu Lei Xue College of Computer Science and Technology Harbin Engineering UniversityHarbin 150001China School of Computer Science Wuhan UniversityWuhan 430072China Department of Computing The Hong Kong Polytechnic UniversityHong Kong 999077China Department of ComputingThe Hong Kong Polytechnic UniversityHong Kong 999077China Key Laboratory of Network Assessment Technology Institute of Information EngineeringChinese Academy of Sciences Beijing 100190China Guangxi Key Laboratory of Trusted Software Guilin University of Electronic TechnologyGuilin 541004China Department of Computer Science City University of Hong KongHong Kong 999077China

Defect prediction assists the rational allocation of testing resources by detecting the potentially defective software modules before releasing products. When a project has no historical labeled defect data, cross project defect prediction (CPDP) is an alternative technique for this scenario. CPDP utilizes labeled defect data of an external project to construct a classification model to predict the module labels of the current project. Transfer learning based CPDP methods are the current mainstream. In general, such methods aim to minimize the distribution differences between the data of the two projects. However, previous methods mainly focus on the marginal distribution difference but ignore the conditional distribution difference, which will lead to unsatisfactory performance. In this work, we use a novel balanced distribution adaptation (BDA) based transfer learning method to narrow this gap. BDA simultaneously considers the two kinds of distribution differences and adaptively assigns different weights to them. To evaluate the effectiveness of BDA for CPDP performance, we conduct experiments on 18 projects from four datasets using six indicators (i.e., F-measure, g-means, Balance, AUC, EARecall, and EAF-measure). Compared with 12 baseline methods, BDA achieves average improvements of 23.8%, 12.5%, 11.5%, 4.7%, 34.2%, and 33.7% in terms of the six indicators respectively over four datasets.

关键词： cross-project defect prediction transfer learning balancing distribution effort-aware indicator

Blood eosinophils and mortality in patients with acute respiratory distress syndrome: A propensity score matching analysis

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World Journal of Emergency Medicine 2021年第2期12卷 131-136页

作者： Hao-tian Chen Jian-feng Xu xiao-xia Huang Ni-ya Zhou Yong-kui Wang Yue Mao Department of Emergency Intensive Care Unit the Second Affi liated Hospital of Zhejiang University School of MedicineHangzhou 310009China Department of Respiratory Therapy the Second Affi liated Hospital of Zhejiang University School of MedicineHangzhou 310009China Department of Respiratory Medicine the Second Affi liated Hospital of Zhejiang University School of MedicineHangzhou 310009China Department of Medical Administration the Second Affi liated Hospital of Zhejiang University School of MedicineHangzhou 310009China Department of Cardiology the Second Affi liated Hospital of Zhejiang University School of MedicineHangzhou 310009China

BACKGROUND: The effect of blood eosinophils(EOSs) on mortality in acute respiratory distress syndrome(ARDS) patients and whether corticosteroids affect this effect are ***: The Medical Information Mart for Intensive Care III database(version 1.4) was used to extract data. Patients with ARDS were selected for inclusion. Cox regression models using the backward stepwise method and propensity score matching(PSM) were used to assess the relationship between blood EOS counts and 28-day mortality. RESULTS: A total of 2,567 patients with ARDS were included, and the 28-day mortality rate was 24.19%. The crude 28-day mortality was significantly lower in patients with EOS counts ≥2%(18.60% [85/457] vs. 25.40% [536/2,110], P=0.002) than in those with EOS counts <2%. In the Cox regression model, the EOS counts ≥2% showed a significant association with the decreased 28-day mortality(hazard ratio [HR] 0.731;95% confidence interval [95% CI] 0.581–0.921, P=0.008). In the corticosteroid non-use subgroup, EOS counts ≥2% was significantly related to decreased 28-day mortality(HR 0.697, 95% CI 0.535–0.909, P=0.008), but the result was not significant in the corticosteroid non-use subgroup model(P=0.860). A total of 457 well-matched pairs were obtained by a 1:1 matching algorithm after PSM. The 28-day mortality remained significantly lower in the EOS counts ≥2% group(18.60% [85/457] vs. 26.70% [122/457], P=0.003).CONCLUSIONS Higher EOS counts are related to lower 28-day mortality in ARDS patients, and this relationship can be counteracted by using corticosteroids.

关键词： Critical care Acute respiratory distress syndrome Eosinophils Mortality Corticosteroid

Recrystallization temperature of tungsten with different deformation degrees

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Rare Metals 2016年第7期35卷 566-570页

作者： xiao-Xin Zhang Qing-Zhi Yan Chun-tian Yang Tong-Nian Wang Min xia Chang-Chun Ge Institute of Nuclear Materials University of Science & Technology Beijing

Pure tungsten （PW） and W-1 wt% La203 （WL10） were prepared by powder metallurgical route fol- lowed by the swaging ＋ rolling process. The logarithmic strains are 0, 0.37, 0.58, and 0.98 for WL10 and 0, 0.58 for PW. Heat treatments were performed at temperatures var- ied from 1,573 to 2,173 K to determine the recrystalliza- tion temperature. Recrystallization temperatures are 1,973 and 2,173 K for WL1 （logarithmic strain of 0.37） and WL3 （logarithmic strain of 0.98）, respectively. But in the case of WL2 （logarithmic strain of 0.58）, full recrystallization is not achieved at temperature of above 2,173 K. Further- more, the recrystallization temperature of PW with loga- rithmic strain of 0.58 is at least 300 K lower than that of the equivalent WLI0 sample. Moreover, the increase of recrystallization temperature inhibits the strength degra- dation of WL2： samples lose 4 % and 22 % strength when annealed at 1,573 and 1,973 K compared with room tem- perature （RT） sample. Finally, the texture evolution for the swaged ＋ rolled WL10 is significantly related to the deformation degree： the dominated orientation is （001） for WL2 while （110） for WL3.

关键词： Tungsten La203 Swaging+rolling Deformation Recrystallization

Surface roughness modulated resistivity in copper thin films

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Science China(Physics,Mechanics & Astronomy) 2018年第10期61卷 70-77页

作者： HongKang Song Ke xia Jiang xiao Department of Physics Beijing Normal University Beijing 100875 China Department of Physics and State Key Laboratory of Surface Physics Fudan University Shanghai 200433 China Collaborative Innovation Center of Advanced Microstructures Nanjing 210093 China

The surfaces of metallic thin films are never flat. The resistivity in thin films is very different from that in bulk because of the unavoidable rough surfaces. In this study, we apply a quantum-mechanical method to study the resistivity in metallic thin *** resulting resistivity formula for metallic thin films merely involves two parameters: bulk relaxation time and surface roughness. We use the formula to fit a large number of experimental data sets for copper thin films obtained using different growing methods. With an additional tuning parameter for calibrating the film thickness, the quantum formula can provide a universal fitting to most data with a satisfactory precision, regardless of their growing methods or data source.

关键词： thin film thickness dependent resistivity surface roughness

A new method for modeling thermo-mechanical behaviors of polycrystalline aggregates

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Science China(Physics,Mechanics & Astronomy) 2012年第11期55卷 2143-2151页

作者： tian xia CUI JunZhi LI BoWen College of Mechanics and Materials HoHai UniversityNanjing 210098China LSEC ICMSECAcademy of Mathematics and System SciencesChinese Academy of SciencesBeijing 100190China

We present in this paper a numerical algorithm that couples the atomistic and continuum models for the thermal-mechanical coupled problem of polycrystalline *** key point is that the conservation laws should be satisfied for both the atomistic and continuum models at the *** with the traditional methods which construct the constitutive equations of the grain interiors and grain boundaries by continuum mechanics,our model calculates the continuum fluxes through molecular dynamics simulations,provided that the atomistic simulations are consistent with the local microstate of the *** the grain interiors without defects,central schemes are available for solving the conservation laws and the constitutive parameters can be obtained via molecular dynamics *** the grain boundary structures,the front tracking method is employed because the solutions of the conservation equations are discontinuous near the ***,appropriate control volumes are chosen at both sides of the interface,then the finite volume method is applied to solve the continuum equations in each control *** near both sides of the interface are calculated via atomistic ***,all thermo-mechanical information can be obtained.

关键词： polycrystalline aggregates molecular dynamics simulation continuum model thermo-mechanical coupled

Effects of Active Modified Atmosphere Packaging on Postharvest Quality of Shiitake Mushrooms (Lentinula edodes) Stored at Cold Storage

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Journal of Integrative Agriculture 2012年第3期11卷 474-482页

作者： YE Jing-jun LI Jian-rong HAN xiao-xiang ZHANG Lei JIANG tian-jia xia Miao College of Food Science and Biotechnology Engineering Zhejiang Gongshang University Hangzhou 310035 P.R.China College of Chemistry Chemical Engineering and Food Safety Bohai University Jinzhou 121013 P.R.China

The effects of active modified atmosphere packaging （MAP） on the postharvest quality of shiitake mushrooms stored at cold temperature （4°C） were *** gas components were 2% O2 ＋7% CO2 （MAP1）,2% O2 ＋10% CO2 （MAP2） and 2% O2 ＋13% CO2 （MAP3）,*** results showed that active MAP could extend the shelf-life of shiitake mushrooms to 17 d and the concentration of carbon dioxide could influence the postharvest quality of shiitake ***2 treatment inhibited the increase in respiration rate and malondinaldehyde （MDA） contents,delayed the decrease in firmness,soluble sugar and vitamin C,and obviously reduced the activity of polyphenol oxidase （PPO） and the degree of browning,therefore maintaining better quality.

关键词： shiitake mushrooms modified atmosphere package (MAP) postharvest quality

Kinetics study of aqueous sorption of phenanthrene to humic acids and sediments

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Journal of Environmental Sciences 2004年第3期16卷 408-413页

作者： ZHOUYan-mei LIURui-xia TANGHong-xiao StateKeyLaboratoryofEnvironmentalAquaticChemistry ResearchCenterforEco-EnvironmentalSciencesChineseAcademyofSciencesBeijing100085China

The sorption behavior was determined for a model polycyclic aromatic hydrocarbon(PAH), i.e., phenanthrene(PHN), from water to three humic acids(HAs) and three sediments in different reacting time. The chemical compositions of HA samples were measured using cross polarization magic angle spinning carbon 13(CPMAS 13 C NMR along with elemental analysis. The dissolved humic substances dissociating from solid HAs and sediments were characterized by 1 H NMR. The experiments indicated that the sorption modes and mechanisms of natural sorbents for PHN varied significantly between short(<7 d) and long contact time and the reaction time should be taken into consideration in studying the overall sorption process. The sorption capacity( K ′ f) and exponent( n ) might be relative to the properties of dissolved humic materials in initial stage but the solid aromatic organic matter after long time reaction. According to the experiments performed in this investigation and the previous researches, a conceptive sorption model was established.

关键词： sorption phenanthrene humic acid sediment CPMAS 13 C NMR

Parasites may exit immunocompromised northern pig-tailed macaques (Macaca leonina)infected with SIVmac239

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Zoological Research 2018年第1期39卷 42-51页

作者： tian-zhang song ming-xu zhang yu-jie xia yu xiao wei pang yong-tang zheng Key Laboratory of Animal Models and Human Disease Mechanisms of the Chinese Academy of Sciences/Key Laboratory of Bioactive Peptides of Yunnan Province Kunming Institute of ZoologyChinese Academy of SciencesKunming Yunnan 650223China University of Chinese Academy of Sciences Bejing 100049China Kunming Primate Research Center Kunming Institute of ZoologyChinese Academy of SciencesKunming Yunnan 650223China

Parasites can increase infection rates and pathogenicity in immunocompromised human immunodeficiency virus （HIV） patients. However, in vitro studies and epidemiological investigations also suggest that parasites might escape immunocompromised hosts during HIV infection Due to the lack of direct evidence from animal experiments, the effects of immunocompromised hosts parasitic infections on remain unclear. Here we detected 14 different parasites in six northern pig-tailed macaques （NPMs） before or at the 50th week of simian immunodeficiency virus （SIV） infection by ELISA. The NPMs all carried parasites before viral injection. At the 50th week after viral injection, the individuals with negative results in parasitic detection （i.e., 08247 and 08287） were characterized as the Parasites Exit （PE） group, with the other individuals （i.e., 09203, 09211, 10205, and 10225） characterized as the Parasites Remain （PR） group. Compared with the PR group, the NPMs in the PE group showed higher viral loads, lower CD4＋ T cells counts, and lower CD4/CD8 rates. Additionally, the PE group had higher immune activation and immune exhaustion of both CD4~ and CD8~ T cells. Pathological observation showed greater injury to the liver, cecum, colon, spleen, and mesenteric lymph nodes in the PE group This study showed more seriously compromised immunity in the PE group, strongly indicating that parasites might exit an immunocompromised host.

关键词： AIDS Immunocompromised Northernpig-tailed macaque Parasite SIVmac239