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Strong interference suppression for subspace judgment analysis

Chinese Journal of Acoustics 2024年第1期43卷 49-63页

作者： SHENG Xueli LI Dewen CAO Ran YIN Jiarui zhou xuan National Key Laboratory of Underwater Acoustic Technology Harbin Engineering UniversityHarbin 150001 College of Underwater Acoustic Engineering Harbin Engineering UniversityHarbin 150001 Qingdao Innovation and Development Base Harbin Engineering UniversityQingdao 266000

When strong interferences are present in underwater environments, the performance of target of interest(TOI) bearing estimation algorithms can be significantly degraded. To address this problem, an interference suppression method for subspace judgment(SSJ) is proposed, which aims to achieve TOI-bearing estimation in the presence of multiple strong interferences. With prior knowledge of the TOI bearing interval, the proposed method builds a judgment item using the correlation between the TOI-interferencenoise subspace and steering vector. The eigenvectors that are not dominated by the TOI are accurately identified via comparison with the estimated judgment threshold. And the identified eigenvectors will be subtracted from the sample covariance matrix(SCM) for interference suppression. The proposed method can obtain a residual SCM that primarily contains the signal of the TOI. It reduces the output power of interference and acquires TOI with a higher signal-to-interference plus noise ratio(SINR), which provides methodical support for improving the capability of TOI-bearing resolution. Simulation and experimental data processing results demonstrate that the proposed method effectively suppresses strong interferences outside TOI-bearing intervals. It reduces the output power of interference and sidelobe levels while improving the capability of TOI-bearing resolution. Compared with other interference suppression methods with subspace, the proposed method has a more robust interference suppression capability.

关键词： interferences estimation Strong

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Rapid qualitative and quantitative analysis of strong aroma base liquor based on SPME-MS combined with chemometrics

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Food Science and Human Wellness 2021年第3期10卷 362-369页

作者： Zongbao Sun Junkui Li Jianfeng Wu Xiaobo Zou Chi-Tang Ho Liming Liang Xiaojing Yan xuan zhou School of Food and Biological Engineering Jiangsu UniversityZhenjiang 212013China Department of Food Science Rutgers UniversityNew BrunswickNew Jersey 08903USA Jiangsu King’s Luck Brewery Co.Ltd. Lianshui 223411China

To objectively classify and evaluate the strong aroma base liquors(SABLs)of different grades,solid-phase microextraction-mass spectrometry(SPME-MS)combined with chemometrics were *** showed that SPME-MS combined with a back-propagation artificial neural network(BPANN)method yielded almost the same recognition performance compared to linear discriminant analysis(LDA)in distinguishing different grades of SABL,with 84%recognition rate for the test *** least squares(PLS),successive projection algorithm partial least squares(SPA-PLS)model,and competitive adaptive reweighed samplingpartial least squares(CARS-PLS)were established for the prediction of the four esters in the ***-PLS model showed a greater advantage in the quantitative analysis of ethyl acetate,ethyl butyrate,ethyl caproate,and ethyl *** results corroborated the hypothesis that SPME-MS combined with chemometrics can effectively achieve an accurate determination of different grades of SABL and prediction performance of esters.

关键词： SPME-MS Strong aroma base liquor(SABL) Chemometrics Grade identification Ester compounds

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要素空间集聚、制度质量对全要素生产率的影响研究

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系统工程理论与实践 2019年第4期39卷 1051-1066页

作者：周璇陶长琪苏州科技大学商学院苏州215009 江西财经大学统计学院南昌330013

要素空间集聚影响空间资源配置效率,制度质量影响要素积累效率,两者的综合作用影响全要素生产率.本文通过量化人力资本、物质资本、劳动力和创新要素集聚,构建要素空间集聚指标,运用中国1997-2016年的省域面板数据,采用空间动态面板数据... 详细信息

要素空间集聚影响空间资源配置效率,制度质量影响要素积累效率,两者的综合作用影响全要素生产率.本文通过量化人力资本、物质资本、劳动力和创新要素集聚,构建要素空间集聚指标,运用中国1997-2016年的省域面板数据,采用空间动态面板数据(SDPD)模型实证检验了要素空间集聚、制度质量对全要素生产率的影响.研究表明:要素空间集聚对全要素生产率增长的作用表现出阈值效应,东、中、西和东北部地区的集聚中心分别是广东、湖北、四川以及辽宁;要素空间集聚和制度质量对全要素生产率增长产生正向作用,两者存在互补的影响关系.研究还发现:东中西和东北地区的要素空间集聚、制度质量对全要素生产率的影响存在明显差异,经济高速增长阶段的要素空间集聚、制度质量对全要素生产率的影响效应最显著.

关键词：要素空间集聚制度质量全要素生产率空间动态面板数据模型

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Improved anti-tumor efficacy and pharmacokinetics of bufalin via PEGylated liposomes

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中国药理学与毒理学杂志 2017年第10期31卷 978-979页

作者： Jia-ni YUAN xuan-xuan zhou Wei CAO Lin-lin BI Yi-fang ZHANG Qian YANG Si-wang WANG Department of Natural Medicine & Institute of Materia Medica School of Pharmacy The Fourth ilitary Medical University Xi ' an China Shaanxi Pharmaceutical Development Center Xi 'an China

OBJECTIVE To determine the characterization,anti-tumor efficacy and pharmacokinetics of bufalin-loaded PEGylated liposomes compared with bufalin *** Bufalin-loaded PEGylated liposomes and bufalin-loaded liposomes were prepared reproducibly with homogeneous particle size by the combination of thin film evaporation method and high pressure homogenization *** particle size and zeta potential of the liposomes were determined by dynamic light scattering *** direct imaging of morphology of liposomes was charactered by transmission electron *** content of bufalin in liposomes was analysed by HPLC *** entrapment efficiency and the particle size was applied to assess the stability profile,after storage at 4℃ on day 0,7,15,30 and *** in-vitro release behaviours of bufalin from liposomes were conducted using dialysis bag technique at 37℃.In-vitro cytotoxicity studies were carried out using MTT[3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide]assay on several kinds of tumor cel lines including SW620,PC-3,MDA-MB-231,A549,U251,U87 and ***-vivo pharmacokinetic study of bufalin liposomes was evaluated by HPLC *** Their mean particle sizes were 127.6 nm and 155.0 nm,mean zeta potentials were 2.24 m V and-18.5 m V,entrapment efficiencies were 76.31%and 78.40%,***-vitro release profile revealed that the release of bufalin in bufalin-loaded PEGylated liposomes was slower than that of bufalin-loaded *** cytotoxicity of blank liposomes has been found within acceptable range,whereas bufalin-loaded PEGylated liposomes showed enhanced cytotoxicity to U251 cells compared with bufalin ***-vivo pharmacokinetics indicated that bufalinloaded PEGylated liposomes could extend eliminate half-life time of bufalin in plasma in *** The results suggested that bufalin-loaded PEGylated liposomes improved the solubility and increased the drug concentration in plasma.

关键词： bufalin PEGylated liposome high pressure homogenization pharmacokinetics

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Associations of Daytime Napping with Incident Cardiovascular Diseases and Hypertension in Chinese Adults:A Nationwide Cohort Study

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Biomedical and Environmental Sciences 2022年第1期35卷 22-34页

作者： WANG Lu WANG Ke LIU Lin Jiong ZHANG Yuan Yuan SHU Hai Nan WANG Kai zhou Pei xuan ZHANG Yun Quan Department of Nursing Medical CollegeWuhan University of Science and TechnologyWuhan 430065HubeiChina Department of Epidemiology and Biostatistics School of Public HealthWuhan University of Science and TechnologyWuhan 430065HubeiChina Hubei Province Key Laboratory of Occupational Hazard Identification and Control Wuhan University of Science and TechnologyWuhan 430065HubeiChina

Objective This study aimed to examine the associations of daytime napping with incident risks of cardiovascular diseases(CVDs)and hypertension(HTN).Methods Data for napping and CVD outcomes in 25 provinces were collected from baseline(2010)and three waves of follow-up(2012-2017)investigations of the China Family Panel *** frailty models with random intercepts for the surveyed provinces were used to assess the longitudinal effects of daytime napping on CVD and *** Compared with non-nappers,30+min nappers had higher risks of CVD and HTN,while no significant associations were observed among<30 min *** risks among 30-to<60-min nappers increased by 22%[hazard ratio(HR)1.22,95% confidence interval(CI)1.08-1.39]for CVD and 21%(1.21,1.04-1.41)for HTN,respectively,with corresponding HRs of CVD and HTN of 1.27(1.09-1.47)and 1.38(1.16-1.65)among≥60 min ***-associated CVD risks varied by subgroups,with stronger associations in participants with lower body mass index(<24 kg/m^(2)),physically inactive persons,smokers,and participants with longer nighttime sleep(≥7 h/night).Significant effects of daytime napping were observed on rural and northern residents only,highlighting great regional variations in CVD risks associated with napping *** This cohort study revealed strong evidence that long daytime napping(≥30 min)is associated with an increased incidence of cardiovascular events.

关键词： Daytime napping Cardiovascular disease Hypertension Adults Sleep duration

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In situ Elemental and Boron Isotopic Geochemistry of Tourmalines from Pegmatites in the Edanggang Li-Be Deposit in the Quanji Massif， NW China

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Journal of Earth Science 2023年

作者： xuan zhou Tong Pan Shan-Ping Li Qing-Feng Ding College of Earth Sciences， Jilin University Bureau of Geological Exploration & Development of Qinghai Province Qinghai Geological Survey Institute

The Edanggang area is characterized by small-scale Li-Be-bearing granitic pegmatites in the Quanji Massif， northwest China. The genesis of these Li-Be-bearing pegmatites remains unresolved. In this study， we use tourmalines as an indicator to constrain the genesis of them. In situ major and trace elements and boron isotopic compositions of tourmaline are analyzed. Two types of tourmalines are recongnized， i.e.， coarse-grained tourmaline (Tur 1) and fine tourmaline (Tur 2). Both types tourmalines share similar geochemical characteristics and are enriched in Fe， Na， and Al， but relatively depleted in Ca and Mg， with compositions close to alkali-group tourmaline and schorl. Petrography， chemical discrimination diagrams， and Al occupations in the Y-site suggest that the tourmalines are magmatic origin formed in the late stage of granitic pegmatite crystallization. Low V and Sr contents， and relatively high Co/Ni ratios of tourmalines are also in agreement with the above origin. The δ11B values of all tourmalines vary from -14.13‰ to -10.40‰， indicating the boron in the pegmatites was mainly derived from parental granitic pegmatite magma. The last-formed magmatic mineral assemblages of magmatic crystallizations in the Early Triassic might contribute to predominant Li and Be reserves rather than the late external hydrothermal metasomatism.

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Methological Quality of Systematic Reviews and Meta-Analyses on Acupuncture for Stroke: A Review of Review

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Chinese Journal of Integrative Medicine 2017年第11期23卷 871-877页

作者： CHEN Xin-lin MO Chuan-wei LU Li-ya GAO Ri-yang XU Qian WU Min-feng zhou Qian-yi HU Yue zhou xuan LI Xian-tao College of Basic Medical Science Guangzhou University of Chinese Medicine Public Health Institute of Health and Wellbeing University of Glasgow First Clinical College Guangzhou University of Chinese Medicine

Objective： To assess the methodological quality of systematic reviews and meta-analyses regarding acupuncture intervention for stroke and the primary studies within them. Methods： Two researchers searched Pub Med, Cumulative index to Nursing and Allied Health Literature, Embase, ISI Web of Knowledge, Cochrane, Allied and Complementary Medicine, Ovid Medline, Chinese Biomedical Literature Database, China National Knowledge Infrastructure, Wanfang and Traditional Chinese Medical Database to identify systematic reviews and meta-analyses about acupuncture for stroke published from the inception to December 2016. Review characteristics and the criteria for assessing the primary studies within reviews were extracted. The methodological quality of the reviews was assessed using adapted Oxman and Guyatt Scale. The methodological quality of primary studies was also assessed. Results： Thirty-two eligible reviews were identified, 15 in English and 17 in Chinese. The English reviews were scored higher than the Chinese reviews（P=0.025）, especially in criteria for avoiding bias and the scope of search. All reviews used the quality criteria to evaluate the methodological quality of primary studies, but some criteria were not comprehensive. The primary studies, in particular the Chinese reviews, had problems with randomization, allocation concealment, blinding, dropouts and withdrawals, intent-to-treat analysis and adverse events. Conclusions： Important methodological flaws were found in Chinese systematic reviews and primary studies. It was necessary to improve the methodological quality and reporting quality of both the systematic reviews published in China and primary studies on acupuncture for stroke.

关键词： systematic review meta-analyses stroke acupuncture review of review methodological quality

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Location based spectrum sensing performance analysis over fading channels in cognitive radio networks

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The Journal of China Universities of Posts and Telecommunications 2010年第5期17卷 26-31页

作者： YAO Hai-peng,zhou Zheng,SUN xuan,LI Bin School of Information and Communication Engineering,Beijing University of Posts and Telecommunications,Beijing 100876,China [a] School of Information Communication Engineering Beijing University of Posts Telecommunications Beijing 100876 China

This paper analyzes the spectrum sensing performance over fading channel,in which a licensee and multiple unlicensed users coexist and operate in the licensed channel in a local *** overall average probabilities of detection and false alarm by jointly taking the fading and the locations of all secondary users into account are derived,and a statistical model of cumulate interference is *** on the cumulate interference,a closed-form expression of outage probability at the primary user’s receiver according to a specific distribution of the fading is ***,the sensing parameters so as to minimize the total spectrum sensing error and maximize the average opportunistic throughput are *** is noted that the overall average performance analysis and results here enable to benchmark the design of specific spectrum sensing algorithms.

关键词： spectrum sensing cognitive radio cumulate interference outage probability

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Advanced 4D-bioprinting technologies for brain tissue modeling and study

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International Journal of Smart and Nano Materials 2019年第3期10卷 177-204页

作者： Timothy J.Esworthy Shida Miao Se-Jun Lee xuan zhou Haitao Cui Yi Y.Zuo Lijie Grace Zhang Department of Mechanical and Aerospace Engineering The George Washington UniversityWashingtonDCUSA Department of Mechanical Engineering University of Hawaii at ManoaHonoluluHIUSA Department of Medicine The George Washington UniversityWashingtonDCUSA Department of Biomedical Engineering The George Washington UniversityWashingtonDCUSA Department of Electrical and Computer Engineering The George Washington UniversityWashingtonDCUSA

Although the process by which the cortical tissues of the brain fold has been the subject of considerable study and debate over the past few decades,a single mechanistic description of the phenomenon has yet to be fully ***,two competing explanations of cortical folding have arisen in recent years;known as the axonal tension and the differential tangential expansion *** the present review,these two models are introduced by analyzing the computational,theoretical,materials-based,and cell studies which have yielded *** Four-dimensional bioprinting is presented as a powerful technology which can not only be used to test both models of cortical folding de novo,but can also be used to explore the reciprocal effects that folding associated mechanical stresses may have on neural ***,the fabrication of‘smart’tissue models which can accurately simulate the in vivo folding process and recapitulate physiologically relevant stresses are *** also provide a general description of both cortical neurobiology as well as the cellular basis of cortical *** discussion also entails an overview of both 3D and 4D bioprinting technologies,as well as a brief commentary on recent advancements in printed central nervous system tissue engineering.

关键词： 4D bioprinting smart materials brain cortical folding gyrification

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Feature Selection for Image Classification Based on a New Ranking Criterion

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Journal of Computer and Communications 2015年第3期3卷 74-79页

作者： xuan zhou Jiajun Wang School of Electronic and Information Engineering Soochow University Suzhou China

In this paper, a feature selection method combining the reliefF and SVM-RFE algorithm is proposed. This algorithm integrates the weight vector from the reliefF into SVM-RFE method. In this method, the reliefF filters out many noisy features in the first stage. Then the new ranking criterion based on SVM-RFE method is applied to obtain the final feature subset. The SVM classifier is used to evaluate the final image classification accuracy. Experimental results show that our proposed relief- SVM-RFE algorithm can achieve significant improvements for feature selection in image classification.

关键词： Feature Selection for Image Classification Based on a New Ranking Criterion

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