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中国激光 2014年第8期41卷 224-231页

作者：张宝华刘鹤内蒙古科技大学信息工程学院内蒙古包头014010

针对红外图像噪声来源复杂且干扰严重,传统的小波阈值方法噪声方差估计偏差较大的问题,提出了一种基于二维经验模态分解(BEMD)子带阈值估计的红外图像去噪方法。通过将噪声图像进行BEMD分解得到二维的内蕴模函数(BIMF)子带,利用高斯混... 详细信息

针对红外图像噪声来源复杂且干扰严重,传统的小波阈值方法噪声方差估计偏差较大的问题,提出了一种基于二维经验模态分解(BEMD)子带阈值估计的红外图像去噪方法。通过将噪声图像进行BEMD分解得到二维的内蕴模函数(BIMF)子带,利用高斯混合模型计算各子带噪声方差。由于噪声估计仅考虑噪声系数,减少了特征分量的影响,获得的阈值更准确,再通过自适应算法分别设定各子带阈值将噪声滤除。实验结果表明,该方法避免了硬阈值函数不连续和软阈值函数偏差较大的缺点,图像整体比较清晰,改善了视觉效果。与传统去噪方法相比,其均方误差(MSE)低,峰值信噪比(PSNR)提高了0.5dB3dB,主客观评价均优于其他去噪方法,且当噪声方差加大后优势更加明显。

关键词：图像处理红外图像二维经验模态分解阈值去噪高斯混合模型内蕴模函数

An RNA-RNA crosstalk network involving HMGB1 and RICTOR facilitates hepatocellular carcinoma tumorigenesis by promoting glutamine metabolism and impedes immunotherapy by PD-L1+ exosomes activity

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Signal Transduction and Targeted Therapy 2022年第1期7卷 282-294页

作者： Yanping Wei Xuewu Tang Yibin Ren Yun Yang Fengliang Song Jingbo Fu Shuowu Liu Miao Yu Jing Chen Suyang Wang Kecheng zhang Yexiong Tan Zhipeng Han Lixjn Wei baohua zhang zhangjun Cheng Liang Li Hongyang Wang International Co-operation Laboratory on Signal Transduction Eastern Hepato-Biliary Surgery InstituteSecond Military Medical UniversityShanghaiChina National Center for Liver Cancer ShanghaiChina Hepato-Pancreato-biliary center Zhongda HospitalSchool of MedicineSoutheast UniversityNanjingChina The Third Department of Hepatic Surgery Eastern Hepatobiliary Surgery HospitalShanghaiChina School of Medicine Nantong UniversityNantongJiangsu ProvinceChina Department of Biliary Tract Surgery Eastern Hepatobiliary Surgery HospitalSecond Military Medical UniversityShanghaiChina Tumor Immunology and Gene Therapy Center Eastern Hepato-Biliary Surgery InstituteSecond Military Medical UniversityShanghaiChina National Laboratory for Oncogenes and Related Genes Cancer InstituteRenJi HospitalShanghai Jiao Tong University200441 ShanghaiChina

Hepatocellular carcinoma(HCC)is the global leading cause of cancer-related deaths due to the deficiency of targets for precision therapy.A new modality of epigenetic regulation has emerged involving RNA-RNA crosstalk networks where two or more competing endogenous RNAs(ceRNAs)bind to the same ***,the contribution of such mechanisms in HCC has not been well ***,potential HMGB1-driven RNA-RNA crosstalk networks were evaluated at different HCC stages,identifying the mT0RC2 component RICTOR as a potential HMGB1 ceRNA in HBV^(+)early stage ***,elevated HMGB1 mRNA was found to promote the expressio n of RICTOR mRNA through competitively bin ding with the miR-200 family,especially *** nal assays emplo ying overexpressi on or in terference strategies dem on strated that the HMGB1 and RICTOR 3zuntra nslated regions(UTR)epigenetically promoted the malignant proliferation,self-renewal,and tumorigenesis in HCC ***,in terference agai nst HMGB1 and RICTOR in HCC cells promoted a stron ger an ti-PD-L1 immuno therapy resp on se,which appeared to associate with the production of PD-L1^(+)***,the HMGB1-driven RNA-RNA crosstalk network facilitated HCC cell glutamine metabolism via dual mechanisms,activating a positive feedback loop involving mT0RC2-AKT-C-MYC to upregulate glutamine synthetase(GS)expression,and inducing mTORCI signaling to derepress SIRT4 on glutamate dehydrogenase(GDH).Meanwhile,this crosstalk network could impede the efficacy of immunotherapy through mTORCI-P70S6K dependent PD-L1 production and PD-L1^(+)exosomes *** conclusion,our study highlights the non-coding regulatory role of HMGB1 with implicatio ns for RNA-based therapeutic targeting together with a predictio n of an ti-PD-L1 immuno therapy in HCC.

关键词： metabolism network crosstalk

Study on Landscape Pattern Index-based Connectivity Analysis of the Primary Farmland Protection Zones

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Journal of Landscape Research 2015年第1期7卷 9-10,12页

作者： MENG Dandan zhang Jinping zhang baohua PAN Qinglong School of Environment and Planning Liaocheng University

Farmland and primary farmland protection are important contents of land management and land use planning of China. In the new round of land use planning and database construction, primary farmland protection zones are required to have high integrity and connectivity. Using landscape pattern indexes, the integrity and connectivity of primary farmland protection zones was studied in Licheng District of Jinan City. The results showed that, except patch area standard deviation, the other indexes including average patch area, patch area variation coefficient, patch edge density, largest patch index, and mean euclidean nearest-neighbor, all indicate high connectivity of primary farmland protection zones after layout adjustment. A simple and convenient method for identifying the integrity and connectivity of primary farmland protection zones was supplied.

关键词： Primary farmland protection zone Integrity and connectivity Landscape pattern index

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一种改进的微机保护装置研究

电力系统保护与控制 2020年第20期48卷 155-161页

作者：金晨张保华安徽大学安徽合肥230000

为了解决传统微机保护装置在电力系统断电恢复的瞬间无法快速有效地对已存在显性故障采取相应保护动作的问题,引入一种新型微机保护装置的研究。首先在硬件上利用蓄电池在电力系统断电时给整个微机保护装置供电,并且控制脉冲输出对跳闸... 详细信息

为了解决传统微机保护装置在电力系统断电恢复的瞬间无法快速有效地对已存在显性故障采取相应保护动作的问题,引入一种新型微机保护装置的研究。首先在硬件上利用蓄电池在电力系统断电时给整个微机保护装置供电,并且控制脉冲输出对跳闸电容进行充电,配合电容电压监测电路,时刻保证其电压值达到驱动断路器的临界电压。另外软件上设计了两种算法。一种适用于系统断电恢复时刻的“快速算法”,以保证能快速地切除断电恢复瞬间的故障。另一种适用于系统正常工作时的“精确算法”,以保证整个装置在正常运行时的可靠性。针对不同的情况,分别使用不同的算法,共同构成新型微机保护装置的保护算法。仿真实验表明:所设计的新型微机保护装置相比于传统的微机保护装置,能在更短的时间内切除电力系统断电恢复瞬间已存在的显性故障,并且不影响正常运行时保护动作的可靠性。

关键词：微机保护保护算法故障切除断电恢复电力系统

Phase-coupling characteristics of ship radiated-noise demodulation spectrum and application

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Chinese Journal of Acoustics 2013年第1期32卷 36-42页

作者： CHENG Yusheng zhang baohua GAO Xin ZHOU Jing Navy Submarine Academy Chinese People's Liberation Army

To solve blade number characteristic extraction problem of low noise ships, phase characteristics of ship radiated-noise demodulation spectrum harmonic components using higher order spectrum analysis were considered. Through analyzing a large number of ship radiated noise data, it points out the existing phase coupling relationship between two or three harmonic components of demodulation spectrum. The phase difference between line spectrum of blade frequency and the sum of line spectrum at shaft frequency and its some harmonic commonly is zero or other constant. Higher-order cumulant is given and higher-order spectrum is simulated when above phase difference is a non-zero constant. The application of phase coupling rela- tionship is studied. According to the higher-order spectral analysis of some weak modulated ship radiated noise, it is indicated that the phase coupling relationship and higher-order spec- tral analysis can improve the ability to extract propeller parameters, especially for the weak modulation.

关键词： In line

Adsorption and desorption mechanisms on graphene oxide nanosheets: Kinetics and tuning

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The Innovation 2021年第3期2卷 79-85页

作者： Xiaodan Qu Qiong Hu Zhongqian Song Zhonghui Sun baohua zhang Jialing Zhong Xuyou Cao Yuanjin Liu Bolin Zhao Zhenbang Liu Yujie Shen Yu Bao Zhenxin Wang Yuwei zhang Li Niu Center for Advanced Analytical Science c/o School of Chemistry and Chemical EngineeringGuangzhou UniversityGuangzhou 510006China State Key Laboratory of Electroanalytical Chemistry Changchun Institute of Applied ChemistryUniversity of Science and Technology of ChinaChangchun 130022China School of Civil Engineering Guangzhou UniversityGuangzhou 510006China University of Science and Technology of China Hefei 230026China

A knowledge of the adsorption and desorption behavior of sorbates on surface adsorptive site(SAS)is the key to optimizing the chemical reactivity of ***,direct identification of the chemical reactivity of SASs is still a challenge due to the limitations of characterization ***,we present a new pathway to determine the kinetics of adsorption/desorption on SASs of graphene oxide(GO)based on total internal reflectance fluorescence *** switching on and off of the fluorescent signal of SAS lit by carbon dots(CDs)was used to trace the adsorption process and desorption *** find that sodium pyrophosphate(PPi)could increase the adsorption equilibrium of CDs thermodynamically and promote the substrate-assisted desorption pathway *** the single turnover level,it was disclosed that the species that can promote desorption may also be an adsorption *** discovery provides significant guidance for improving the chemical reactivity of the heterogeneous catalyst.

关键词： adsorption desorption fluorescence microscopy graphene oxide carbon dots

Physiological and transcriptome analyses of Chinese cabbage in response to drought stress

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Journal of Integrative Agriculture 2024年第7期23卷 2255-2269页

作者： Lin Chen Chao Li Jiahao zhang Zongrui Li Qi Zeng Qingguo Sun Xiaowu Wang Limin Zhao Lugang zhang baohua Li State Key Laboratory for Crop Stress Resistance and High-Efficiency Production College of HorticultureNorthwest A&F UniversityYangling 712100China Institute of Vegetables and Flowers Chinese Academy of Agricultural SciencesBeijing 100081China

Chinese cabbage is an important leafy vegetable crop with high water demand and susceptibility to drought *** explore the molecular mechanisms underlying the response to drought,we performed a transcriptome analysis of drought-tolerant and-sensitive Chinese cabbage genotypes under drought stress,and uncovered core drought-responsive genes and key signaling pathways.A co-expression network was constructed by a weighted gene coexpression network analysis(WGCNA)and candidate hub genes involved in drought tolerance were ***,abscisic acid(ABA)biosynthesis and signaling pathways and their drought responses in Chinese cabbage leaves were systemically *** also found that drought treatment increased the antioxidant enzyme activities and glucosinolate contents *** results substantially enhance our understanding of the molecular mechanisms underlying drought responses in Chinese cabbage.

关键词： Chinese cabbage drought stress abscisic acid weighted gene co-expression network analysis glucosinolate

Enhancing Green Ammonia Electrosynthesis Through Tuning Sn Vacancies in Sn‑Based MXene/ MAX Hybrids

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Nano-Micro Letters 2024年第5期16卷 154-168页

作者： Xinyu Dai Zhen‑Yi Du Ying Sun Ping Chen Xiaoguang Duan Junjun zhang Hui Li Yang Fu baohua Jia Lei zhang Wenhui Fang Jieshan Qiu Tianyi Ma Key Laboratory for Green Synthesis and Preparative Chemistry of Advanced Materials of Liaoning Province College of ChemistryInstitute of Clean Energy ChemistryLiaoning UniversityShenyang 110036People’s Republic of China State Key Laboratory of Clean and Efficient Coal Utilization Taiyuan University of TechnologyTaiyuan 030024People’s Republic of China School of Chemistry and Chemical Engineering Anhui UniversityHefei 230601People’s Republic of China School of Chemical Engineering The University of AdelaideAdelaideSA 5005Australia State Key Laboratory of High‑Efficiency Utilization of Coal and Green Chemical Engineering College of Chemistry and Chemical EngineeringNingxia UniversityYinchuan 750021NingxiaPeople’s Republic of China School of Science RMIT UniversityMelbourneVIC 3000Australia Guangdong Provincial Key Laboratory of Advanced Energy Storage Materials School of Chemistry and Chemical EngineeringSouth China University of TechnologyGuangzhou 510640People’s Republic of China College of Chemical Engineering State Key Laboratory of Chemical Resource EngineeringBeijing University of Chemical TechnologyBeijing 100029People’s Republic of China

Renewable energy driven N_(2) electroreduction with air as nitrogen source holds great promise for realizing scalable green ammonia ***,relevant out-lab research is still in its ***,a novel Sn-based MXene/MAX hybrid with abundant Sn vacancies,Sn@Ti_(2)CTX/Ti_(2)SnC–V,was synthesized by controlled etching Sn@Ti_(2)SnC MAX phase and demonstrated as an efficient electrocatalyst for electrocatalytic N2 *** to the synergistic effect of MXene/MAX heterostructure,the existence of Sn vacancies and the highly dispersed Sn active sites,the obtained Sn@Ti2CTX/Ti_(2)SnC–V exhibits an optimal NH_(3) yield of 28.4μg h^(−1) mg_(cat)^(−1) with an excellent FE of 15.57% at−0.4 V versus reversible hydrogen electrode in 0.1 M Na_(2)SO_(4),as well as an ultra-long ***,this catalyst represents a satisfactory NH3 yield rate of 10.53μg h^(−1) mg^(−1) in the home-made simulation device,where commercial electrochemical photovoltaic cell was employed as power source,air and ultrapure water as feed *** as-proposed strategy represents great potential toward ammonia production in terms of financial cost according to the systematic technical economic *** work is of significance for large-scale green ammonia production.

关键词： Green ammonia synthesis N2 electroreduction Renewable energy Sn MXene/MAX hybrid

Low degree partial melting may have extended the age of the Earth's inner core

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Low degree partial melting may have extended the age of the ...