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A random linear code based secure transmission scheme for wireless fading channels

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Science China(Information Sciences) 2017年第4期60卷 241-243页

作者： Lukman A.OLAWOYIN nana zhang A.O.OLOYEDE Nasir FARUK Hongwen YANG Wireless Communication Center Beijing University of Posts and Telecommunications Department of Telecommunication Science University of Ilorin

Dear editor,Wireless transmissions are vulnerable to potential security threats such as eavesdropping and wiretapping since unauthorized reception is facilitated through wireless channels[1].Traditional system security is mainly implemented in the higher layers of the communication protocol stack,relying on authentication and cryptography[2].The recent researches explore security in the physical layer[3],which can help to protect the information

关键词： code length A random linear code based secure transmission scheme for wireless fading channels

The mitochondria-localized protein OsNDB2 negatively regulates grain size and weight in rice

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The Crop Journal 2022年第6期10卷 1819-1824页

作者： Mingxin Guo Jiajia Liu Linlin Hou Suna Zhao nana zhang Lili Lu Xusheng Zhao College of Life Sciences Luoyang Normal UniversityLuoyang 471934HenanChina

Grain size is a determinant of rice grain *** plants,mitochondria supply energy for cellular metabolism via the mitochondrial electron transport *** we report that OsNDB2,which encodes a putative rotenone-insensitive typeⅡNAD(P)H dehydrogenase(ND),negatively regulates grain size and weight in *** ND members representing three major types of rice were identified,and the predicted OsNDB2 protein was localized to *** of OsNDB2 transcripts were higher in young panicles and leaf ***2 overexpression reduced grain length,grain width,and 1000-grain weight and moderately influenced plant height,while knockout of OsNDB2 increased grain size and 1000-grain *** mutations of OsNDB2 were associated with diverse grain *** observations revealed that variations in grain size of transgenic lines were caused by change in cell expansion but not cell proliferation in spikelet *** study sheds light on OsNDB2 function and provides a new potential breeding approach for increasing rice grain size and weight.

关键词： Rice OsNDB2 TypeⅡNAD(P)H dehydrogenase Allelic mutants Grain size

A Performance Fault Diagnosis Method for SaaS Software Based on GBDT Algorithm

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Computers, Materials & Continua 2020年第3期62卷 1161-1185页

作者： Kun Zhu Shi Ying nana zhang Rui Wang Yutong Wu Gongjin Lan Xu Wang School of Computer Science Wuhan UniversityWuhan430072China Department of Computer Science Vrije University AmsterdamAmster-dam1081HVThe Netherlands

SaaS software that provides services through cloud platform has been more widely used ***,when SaaS software is running,it will suffer from performance fault due to factors such as the software structural design or complex *** is a major challenge that how to diagnose software quickly and accurately when the performance fault *** this challenge,we propose a novel performance fault diagnosis method for SaaS software based on GBDT(Gradient Boosting Decision Tree)*** particular,we leverage the monitoring mean to obtain the performance log and warning log when the SaaS software system runs,and establish the performance fault type set and determine performance log *** also perform performance fault type annotation for the performance log combined with the analysis result of the warning ***,we deal with the incomplete performance log and the type non-equalization problem by using the mean filling for the same type and combination of SMOTE(Synthetic Minority Oversampling Technique)and undersampling ***,we conduct an empirical study combined with the disaster reduction system deployed on the cloud platform,and it demonstrates that the proposed method has high efficiency and accuracy for the performance diagnosis when SaaS software system runs.

关键词： GBDT algorithm SaaS software performance log performance fault diagnosis

Atomically Dispersed Fe on Nanosheet-linked, Defect-rich, Highly N-Doped 3D Porous Carbon for Efficient Oxygen Reduction

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Chemical Research in Chinese Universities 2020年第3期36卷 453-458页

作者： WANG Yuqing TAO Li CHEN Ru LI Hao SU Hui zhang nana LIU Qinghua WANG Shuangyin State Key Laboratory of Chemo Bio-sensing ami Chemometrics Provincial Hunan Key Laboratory for Graphene Materials and DevicesCollege of Chemistry and Chemical EngineeringHunan UniversityChangsha 410082P.R.China USA National Synchrotron Radiation Laboratory University of Science and Technology of ChinaHefei 230029P.R.China

Exploring cost-effective and high-performance oxygen reduction reaction(ORR)electrocatalysts to replace precious platinum-based materials is crucial for developing electrochemic al energy conversion devices but remains a great ***,Fe single atoms anchored on nanosheet-linked,defect-rich,highly N-doped 3D porous carbon(Fe-SAs/NLPC)electrocatalysts wer obtained by pyrolyzing saltsealed Fe-doped zeolitic imidazolate frameworks(ZIFs).NaCl functions both as pore-forming agent and closed nanoreactor,which can not only lead to the formation of defects-rich three-dimensional interconnected structures with high N-doping content to expose abundant active sites,promote mass transfer and electron transfer,but also facilitate the effective incorporation of Fe to form Fe-N,active sites without *** unique characteristics render Fe-SAs/NLPC outstanding electrocatalytic activity for ORR,with one-set potential of 0.96V and high kinetic current density(jK)of 33.32mA/cm^2 in alkaline medium,which surpass the values of most nonprecious-metal catalysts and even commercial Pt/C.

关键词： Single-atom catalyst Porous carbon Non-precious metal Oxygen reduction reaction

High-temperature ferromagnetic metallic phase in LaMnO_(3)/Sr_(3)Al_(2)O_(6)heterostructure

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Journal of Materials Science & Technology 2022年第24期119卷 69-74页

作者： Di Wang Bin He Jinrui Guo Qixiang Wang Chaoqun Shi Yue Han Hong Fang Jie Wang nana zhang Peng zhang Yanan Chen Changwen zhang Weiming Lü Shishen Yan Spintronics Institute School of Physics and TechnologyUniversity of JinanJinan250022China Condensed Matter Science and Technology Institute School of Instrumentation Science and EngineeringHarbin Institute of TechnologyHarbin150080China School of Physics Shandong UniversityJinan250100China

To achieve a flexible single-crystal multifunctional membrane,the freestanding process of a rigid epitaxial transition metal oxide thin film via a buffered water-dissolution sacrificial layer has attracted reasonable *** to the difference in chemical potential,specific element affinity,and lattice constant between the target membrane and the sacrificial layer,the freestanding process may cause an indelible change of physics property once the target thin film is sensitive to the above ***,the heterostructures composed of the generally adopted sacrificial layer Sr_(3)Al_(2)O_(6)(SAO)and LaMnO_(3)(LMO)have been systematically *** electrical and magnetic properties of LMO show extreme sensitivity to the thickness of SAO(tSAO).Then we have also found that LMO/SAO heterostructures can exhibit the coexistence of two ferromagnetic phases,the significantly enhanced Curie temperature~342 K,and the large magnetoresistance-23.3%at 300 K,which is similar to the optimal-doped manganite such as La_(2/3)Sr_(1/3)MnO_(3).X-ray diffraction results show that continuously tunable strain from out-of-plane tension to relaxation and then to compression can be generated by adjusting *** strain can stabilize the migrated oxygen from LMO to SAO,which is induced by the large oxygen affinity difference between Bsite Mn and *** is believed that these unexpected electrical/magnetic phenomena are originated from the combined effects of interfacial element diffusion and *** study provides a strategy for designing new magnetic phases,and a reference for the fundamental understanding of strongly correlated transition metal oxide systems in the freestanding process.

关键词： Sr_(3)Al_(2)O_(6) LaMnO_(3) Oxygen affinity Oxygen ions migration Strain effects

Three-dimensional porous In_(2)O_(3) arrays for self-powered transparent solar-blind photodetectors with high responsivity and excellent spectral selectivity

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Nano Research 2024年第5期17卷 4471-4477页

作者： nana zhang Xinyu Gao Haoran Guan Simin Sun Jiaming Liu Zhitao Shao Qiyue Gao Yuan zhang Ruyu Sun Guang Yang Feng Gao Wei Feng College of Chemistry Chemical Engineering and Resource UtilizationNortheast Forestry UniversityHarbin 150040China Key Laboratory for Photonic and Electronic Bandgap Materials Ministry of EducationSchool of Physics and Electronic EngineeringHarbin Normal UniversityHarbin 150025China

Transparent solar-blind ultraviolet photodetectors(SBUV PDs)have extensive applications in versatile scenarios,such as optical ***,it is still challenging to simultaneously achieve high responsivity,high transparency,and satisfying self-powered ***,we demonstrated high-performance,transparent,and self-powered photoelectrochemical-type(PEC)SBUV PDs based on vertically grown ultrathin In_(2)O_(3) nanosheet arrays(NAs)with a three-dimensional(3D)porous *** 3D porous structure simultaneously improves the transmittance in the visible light region,accelerates interfacial reaction kinetics,and promotes photogenerated carrier *** performance of In_(2)O_(3) NAs photoanodes exceeds most reported self-powered PEC SBUV PDs,exhibiting a high transmittance of approximately 80%in the visible light region,a high responsivity of 86.15 mA/W for 254 nm light irradiation,a fast response speed of 15/18 ms,and good multicycle *** In_(2)O_(3) NAs also show excellent spectral selectivity with an ultrahigh solar-blind rejection ratio of 1319.30,attributed to the quantum confinement effect induced by the ultrathin feature(2-3 nm).Furthermore,In_(2)O_(3) NAs photoanodes show good capability in underwater optical *** work demonstrated that a 3D porous structure is a powerful strategy to synchronously achieve high responsivity and transparency and provides a new perspective for designing high-performance,transparent,and self-powered PEC SBUV PDs.

关键词： In_(2)O_(3) three-dimensional porous transparent photoelectrochemical solar-blind photodetectors

A novel β-AR agonist, Higenamine, induces β-arrestin-biased signaling

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Science China Life Sciences 2021年

作者： nana zhang Haibo Zhu Zijian Li Erdan Dong State Key Laboratory for Bioactive Substances and Functions of Natural Medicines Institute of Materia Medica Chinese Academy of Medical Sciences & Peking Union Medical College Department of Cardiology and Institute of Vascular Medicine Peking University Third Hospital Key Laboratory of Cardiovascular Molecular Biology and Regulatory Peptides Ministry of Health

The biased ligands in G protein-coupled receptors（GPCRs） have opened new avenues for developing safer and more effective drugs. However, the identification of such biased ligands as drug candidates is highly desirable. Here, we report that Higenamine,a compound isolated from a Chinese herb, functions as a novel β-arrestin-biased ligand of the β2-adrenergic receptor（β2-AR）.The radioligand binding assays demonstrated that Higenamine was the ligand of β2-AR. Higenamine induced phosphorylation of extracellular signal-regulated kinase 1/2（ERK1/2）, which can be blocked by propranolol, an inhibitor of β2-AR. The Gi protein inhibitor, pertussis toxin, had no effect on the phosphorylation of ERK1/2 induced by Higenamine. Furthermore, Higenamine induced ERK1/2 phosphorylation through transactivation of Epithelial growth factor receptor（EGFR）. We also found that Higenamine-induced-ERK1/2 phosphorylation is dependent on β-arrestin1/2, and HG inhibits Doxorubicin-induced cardiomyocyte apoptosis. Our results identify Higenamine as a novel biased ligand via the β-arrestin-dependent pathway. These findings give us a better understanding of Higenamine’s potential role in designing diagnostic and therapeutic strategies.

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Lower Bounds of Dirichlet Eigenvalues for General Grushin Type Bi-Subelliptic Operators

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Analysis in Theory and Applications 2019年第1期35卷 66-84页

作者： Hua Chen Hongge Chen Junfang Wang nana zhang School of Mathematics and Statistics Wuhan University

Let Q be a bounded open domain in R^n with smooth boundaryаΩ.Let X=(X1,X2…,Xm)be a system of general Grushin type vector fields defined onΩand the boundaryаΩis non-characteristic for ***△x=∑j=1^mXj^2,we denoteλk as the k-th eigenvalue for the bi-subelliptic operator△X2^2 onΩ.In this paper,by using the sharp sub-elliptic estimates and maximally hypoeliptic estimates,we give the optimal lower bound estimates ofλk for the operatork△X^2.

关键词： Eigenvalues degenerate elliptic operators sub-elliptic estimate maximally hypoelliptic estimate bi-subelliptic operator

Activity origin and alkalinity effect of electrocatalytic biomass oxidation on nickel nitride

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Journal of Energy Chemistry 2021年第10期30卷 179-185,I0006页

作者： Bo Zhou Chung-Li Dong Yu-Cheng Huang nana zhang Yandong Wu Yuxuan Lu Xu Yue Zhaohui Xiao Yuqin Zou Shuangyin Wang State Key Laboratory of Chem/Bio-Sensing and Chemometrics Provincial Hunan Key Laboratory for Graphene Materials and DevicesCollege of Chemistry and Chemical EngineeringHunan UniversityChangsha 410082HunanChina Department of Physics Tamkang UniversityNew Taipei City 25137TaiwanChina

Electro-oxidation of 5-hydroxymethylfurfural(HMFOR)is a promising green approach to realize the conversion of biomass into value-added ***,considering the complexity of the molecular structure of HMF,an in-depth understanding of the electrocatalytic behavior of HMFOR has rarely been ***,the electrocatalytic mechanism of HMFOR on nickel nitride(Ni3 N)is elucidated by operando X-ray absorption spectroscopy(XAS),in situ Raman,quasi in situ X-ray photoelectron spectroscopy(XPS),and operando electrochemical impedance spectroscopy(EIS),*** activity origin is proved to be Ni^(2+δ)N(OH)ads generated by the adsorbed hydroxyl ***,HMFOR on Ni3 N relates to a two-step reaction:Initially,the applied potential drives Ni atoms to lose electrons and adsorb OH-after 1.35 VRHE,giving rise to Ni^(2+δ)N(OH)ads with the electrophilic oxygen;then Ni^(2+δ)N(OH)ads seizes protons and electrons from HMF and leaves as H_(2) O ***,the high electrolyte alkalinity favors the HMFOR process due to the increased active species(Ni^(2+δ)N(OH)ads)and the enhanced adsorption of HMF on the Ni3 N *** work could provide an in-depth understanding of the electrocatalytic mechanism of HMFOR on Ni3 N and demonstrate the alkalinity effect of the electrolyte on the electrocatalytic performance of HMFOR.

关键词： Biomass electro-oxidation Activity origin Alkalinity effect Operando techniques HMF