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Dynamics of Bt cotton Cry1Ac protein content under an alternating high temperature regime and effects on nitrogen metabolism

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Journal of Integrative Agriculture 2018年第9期17卷 1991-1998页

作者： ZHANG Xiang RUI Qiu-zhi LIANG pan-pan WEI Chen-hua deng Guo-qiang CHEN Yuan DONG Zhao-di CHEN De-hua Key Laboratory of Crop Genetics and Physiology of Jiangsu Province Yangzhou UniversityYangzhou 225009P.R.China Plant Genome Mapping Laboratory University of GeorgiaAthens 30605USA

This study was conducted to investigate the effects of alternating high temperature on CrylAc protein content on Bt cotton cultivars Sikang 1 （SK-1, a conventional cultivar） and Sikang 3 （SK-3, a hybrid cultivar）. In 2011 and 2012, cotton plants were subjected to high temperature treatments ranging from 32 to 40℃ in climate chambers to investigate the effects of high temperature on boll shell insecticidal protein expression. The experiments showed that significant decline of the boll shell insecticidal protein was detected at temperatures higher than 38℃ after 24 h. Based on the results, the cotton plants were treated with the threshold temperature of 38℃ from 6：00 a.m. to 6：00 p.m. followed by a normal temperature of 27℃ during the remaining night hours （DH/NN） in 2012 and 2013. These treatments were conducted at peak boll growth stage for both cultivars in study periods of 0, 4, 7, and 10 d. Temperature treatment of 32℃ from 6：00 a.m. to 6：00 p.m. and 27℃ in the remaining hours was set as control. The results showed that, compared with the control, after the DH/NN stress treatment applied for 7 d, the boll shell CrylAc protein content level was significantly decreased by 19.1 and 17.5% for SK-1 and by 15.3 and 13.7% for SK-3 in 2012 and 2013, respectively. Further analysis of nitrogen metabolic physiology under DH/NN showed that the soluble protein content and the glutamic pyruvic transaminase （GPT） activities decreased slightly after 4 d, and then decreased sharply after 7 d. The free amino acid content and the protease content increased sharply after 7 d. The changes in SK-1 were greater than those in SK-3. These results suggest that under DH/NN stress, boll shell CrylAc protein content decline was delayed. Reduced protein synthesis and increased protein degradation in the boll shell decreased protein content, including Bt protein, which may reduce resistance to the cotton bollworm.

关键词： Bt cotton alternating temperature CrylAc protein nitrogen metabolism

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RT-YOLO:A Residual Feature Fusion Triple Attention Network for Aerial Image Target Detection

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Computers, Materials & Continua 2023年第4期75卷 1411-1430页

作者： pan Zhang Hongwei deng Zhong Chen College of Computer Science and Technology Hengyang Normal UniversityHengyang421002China

In recent years,target detection of aerial images of unmannedaerial vehicle(UAV)has become one of the hottest ***,targetdetection of UAV aerial images often presents false detection and *** proposed a modified you only look once(YOLO)model toimprove the problems arising in object detection in UAV aerial images:(1)A new residual structure is designed to improve the ability to extract featuresby enhancing the fusion of the inner features of the single *** the sametime,triplet attention module is added to strengthen the connection betweenspace and channel and better retain important feature information.(2)Thefeature information is enriched by improving the multi-scale feature pyramidstructure and strengthening the feature fusion at different scales.(3)A newloss function is created and the diagonal penalty term of the anchor frame isintroduced to improve the speed of training and the accuracy of *** proposed model is called residual feature fusion triple attention YOLO(RT-YOLO).Experiments showed that the mean average precision(mAP)ofRT-YOLO is increased from 57.2%to 60.8%on the vehicle detection in aerialimage(VEDAI)dataset,and the mAP is also increased by 1.7%on the remotesensing object detection(RSOD)*** results show that theRT-YOLOoutperforms other mainstream models in UAV aerial image object detection.

关键词： Attention mechanism small target detection YOLOv5s RT-YOLO

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Nonvolatile electrical control of spin polarization in the 2D bipolar magnetic semiconductor VSeF

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npj Computational Materials 2023年第1期9卷 1838-1847页

作者： Yuhui Li Jun deng Yan-Fang Zhang xin Jin Wen-Han Dong Jia-Tao Sun Jinbo pan Shixuan Du Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of Sciences100190 BeijingChina University of Chinese Academy of Sciences Chinese Academy of Sciences100190 BeijingChina School of Integrated Circuits and Electronics MIIT Key Laboratory for Low-Dimensional Quantum Structure and DevicesBeijing Institute of Technology100081 BeijingChina Songshan Lake Materials Laboratory 523808 DongguanChina CAS Center for Excellence in Topological Quantum Computation 100190 BeijingChina

Nonvolatile electrical control of spin polarization in two-dimensional(2D)magnetic semiconductors is greatly appealing toward future low-dissipation spintronic ***,we report a 2D material VSeF,which is an intrinsic bipolar magnetic semiconductor(BMS)featured with opposite spin-polarized valence and conduction band *** then propose a general nonvolatile strategy to manipulate both spin-polarized orientations in BMS materials by introducing a ferroelectric gate with proper band *** spin-up/spin-down polarization of VSeF is successfully controlled by the electric dipole of ferroelectric bilayer Al_(2)Se_(3),verifying the feasibility of the design *** interfacial doping effect from ferroelectric gate also plays a role in enhancing the Curie temperature of the VSeF *** types of spin field effect transistors,namely multiferroic memory and spin filter,are further achieved in VSeF/Al_(2)Se_(3) and VSeF/Al_(2)Se_(3)/Al_(2)Se_(3) multiferroic heterostructures,*** work will stimulate the application of 2D BMS materials in future spintronic nanodevices.

关键词： ferroelectric volatile magnetic

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Detection performance and inversion processing of logging-while-drilling extra-deep azimuthal resistivity measurements

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Petroleum Science 2019年第5期16卷 1015-1027页

作者： Lei Wang Shao-Gui deng pan Zhang Ying-Chang Cao Yi-Ren Fan Xi-yong Yuan School of Geosciences China University of PetroleumQingdao 266580ShandongChina Laboratory for Marine Mineral Resources Qingdao National Laboratory for Marine Science and TechnologyQingdao 266071ShandongChina CNPC Key Laboratory for Well Logging China University of PetroleumQingdao 266580ShandongChina

We present systematic investigations on the physics,detection performance and inversion of logging-while-drilling extradeep azimuthal resistivity measurements(EDARM).First,the definitions of EDRAM measurements are discussed,followed by the derivation of the attenuation and phase-shift geometrical factors to illustrate the relative contributions of formation units to the observed ***,a new definition of detection depth,which considers the uncertainty of inversion results caused by the data noise,is proposed to quantify the detection capability of ED ***,the B ayesian theory associated with Markov chain Monte Carlo sampling is introduced for fast processing of EDARM *** results show that ED ARM is capable of detecting the azimuth and distance of remote bed boundaries,and the detection capability increases with increasing spacing and resistivity *** EDARM tool can accommodate a large range of formation resistivity and is able to provide the resistivity anisotropy at arbitrary relative dipping *** addition,multiple bed boundaries and reservoir images near the borehole are readily obtained by using the Bayesian inversion.

关键词： Extra-deep azimuthal resistivity measurements(EDARM) Detection performance Inversion method Reservoir imaging Detection of multiple bed boundaries

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Dynamics of low-speed streak evolution and interaction in laminar boundary layer

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Acta Mechanica Sinica 2014年第5期30卷 636-645页

作者： Si-Chao deng Chong pan Jin-Jun Wang Fluid Mechanics Key Laboratory of Ministry of Education Beihang University

The present paper presents an experimental effort on the regeneration process of two low-speed laminar streaks in a zero-pressure-gradient laminar boundary layer. Two vertical thin wires separated by a spanwise distance of 30 mm are used to introduce disturbances of two rolls of transitional Karmain vortex street to the downstream boundary layer. Both hydrogen bubble visualization and particle image velocimetry （PIV） measurement show that two lowspeed streaks are induced through leading-edge receptivity process. As these streaks develop in the downstream, two additional low-speed streaks begin to appear outboard of the flank of the original two, together with complex dynamics of streak splitting and merging. A flow pattern of four streaks aligned along the spanwise direction occurs finally in the far downstream. It is found that besides the mechanisms of streak breakdown, the streak interaction is also an important factor characterizing the instability of low speed streaks and their regeneration process.

关键词： Low-speed streak - Boundary layer transition Streak reproduction

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Dimensionality reduction via kernel sparse representation

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Frontiers of Computer Science 2014年第5期8卷 807-815页

作者： zhisong pan Zhantao deng Yibing WANG Yanyan ZHANG College of Command Information Systems PLA University of Science and Technology Nanjing 210007 China

Dimensionality reduction （DR） methods based on sparse representation as one of the hottest research topics have achieved remarkable performance in many applications in recent years. However, it＇s a challenge for existing sparse representation based methods to solve nonlinear problem due to the limitations of seeking sparse representation of data in the original space. Motivated by kernel tricks, we proposed a new framework called empirical kernel sparse representation （EKSR） to solve nonlinear problem. In this framework, non- linear separable data are mapped into kernel space in which the nonlinear similarity can be captured, and then the data in kernel space is reconstructed by sparse representation to preserve the sparse structure, which is obtained by minimiz- ing a ~1 regularization-related objective function. EKSR pro- vides new insights into dimensionality reduction and extends two models： 1） empirical kernel sparsity preserving projec- tion （EKSPP）, which is a feature extraction method based on sparsity preserving projection （SPP）; 2） empirical kernel sparsity score （EKSS）, which is a feature selection method based on sparsity score （SS）. Both of the two methods can choose neighborhood automatically as the natural discrimi- native power of sparse representation. Compared with sev- eral existing approaches, the proposed framework can reduce computational complexity and be more convenient in prac- tice.

关键词： feature extraction feature selection sparse rep-resentation kernel trick

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Experimental Study on Heat Transfer and Flow Resistance in Improved Latticework Cooling Channels

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Journal of Thermal Science 2013年第3期22卷 250-256页

作者： Hongwu deng Kai Wang Jianqin Zhu Wenyan pan National Key Laboratory of Science and Technology on Aero-Engine Aero-Thermodynamics School of Jet Propulsion Beihang University Institute of Engineering Thermophysics Chinese Academy of Science

Characteristics of heat transfer and flow resistance of the latticework (vortex) cooling channel with ribs truncated at their two ends were theoretically and experimentally studied compared with regular and smooth channels of the same configuration. The results showed: the heat transfer efficiency of the latticework channel with two slots was better than those of regular and smooth channels of the same configuration, its flow resistance situation in the slotted channel becomes quite complex; The flow resistances of 2 mm- and 4 mm-slotted channels were obviously lower than that of the regular channel, but they are still much higher than that of the smooth channel; Compared with the regular channel, the total heat transfer efficiencies of the slotted channels were pretty improved, among them the 4-mm slotted channel has the biggest enhancement. From the experimental results, it is obvious that the latticework channel with proper slots has a great prospect in the design of the inner cooling channels of turbine blades.

关键词： latticework cooling turbine blade truncated ribs heat transfer flow resistance

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SEMI-SUPERVISED RADIO TRANSMITTER CLASSIFICATION BASED ON ELASTIC SPARSITY REGULARIZED SVM

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Journal of Electronics(China) 2012年第6期29卷 501-508页

作者： Hu Guyu Gong yong Chen Yande pan zhisong deng Zhantao Institute of Command Automation PLA University of Science and Technology Nanjing Army Command College Nanjing 210045

Non-collaborative radio transmitter recognition is a significant but challenging issue, since it is hard or costly to obtain labeled training data samples. In order to make effective use of the unlabeled samples which can be obtained much easier, a novel semi-supervised classification method named Elastic Sparsity Regularized Support Vector Machine (ESRSVM) is proposed for radio transmitter classification. ESRSVM first constructs an elastic-net graph over data samples to capture the robust and natural discriminating information and then incorporate the information into the manifold learning framework by an elastic sparsity regularization term. Experimental results on 10 GMSK modulated Automatic Identification System radios and 15 FM walkie-talkie radios show that ESRSVM achieves obviously better performance than KNN and SVM, which use only labeled samples for classification, and also outperforms semi-supervised classifier LapSVM based on manifold regularization.

关键词： Radio transmitter recognition Cyclic spectrum density Semi-supervised classification Elastic Sparsity Regularized Support Vector Machine (ESRSVM)

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Cryptanalysis of an Encryption Scheme Using Matrices over Finite Fields

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Chinese Journal of Electronics 2018年第2期27卷 292-296页

作者： HUANG Huawei deng Lunzhi LI Chunhua pan Chunhua School of Mathematical Sciences Guizhou Normal University School of Science East China Jiaotong University College of Mathematics and Information Science South China Agricultural University

This paper presents an attack on an encryption scheme proposed by Pei et al. using matrices over finite fields in 2010. The public information allows the derivation of a system of polynomial equations for the equivalent secret key. By the equivalent secret key, the plaintexts of the encryption scheme can be obtained by the public key and the ciphertexts without the secret key.

关键词： Ergodic matrix Public-key cryptography Computational complexity Algorithms Finite Field

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A modified maxwell-pulse thermoplastic constitutive model of in-situ Ta-particle reinforced Zr-based bulk metallic glass composites

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Progress in Natural Science:Materials International 2024年第4期34卷 753-766页

作者： pan Gong Zhuang Wang Guoqing Yu Maojun Li xin Zhuo Xuefeng Tang Mao Zhang Lei deng Junsong Jin A.A.Churakova xinyun Wang State Key Laboratory of Materials Processing and Die & Mould Technology School of Materials Science and Engineering Huazhong University of Science and Technology State Key Laboratory of Advanced Design and Manufacturing Technology for Vehicle Hunan University Institute of Molecule and Crystal Physics Ufa Federal Research Center RAS

The impact of different Ta contents on the mechanical properties and thermoplastic forming ability of in-situ Taparticle reinforced Zr–Cu–Al–Ni bulk metallic glass composites was studied. The composition(Zr55Cu30Al10-Ni5)94Ta6with the best comprehensive performance was chose for a systematic investigation into its thermoplastic behavior in the supercooled liquid region（SLR）, with quantitative analysis conducted by the strain rate sensitivity index and activation volume. The steady-state flow stress and the stress overshoot intensity were augmented with deformation temperature decreasing, strain rate increasing, and the addition of the secondary phase, leading to a transition from Newtonian to non-Newtonian flow regime. The addition of the secondary phase deteriorated the rheological properties of the material. To solve the problem that the Maxwell-Pulse constitutive model showed an inability to accurately describe the steady-state flow process. A modified constitutive relationship, introducing the effect of the volume fraction of Ta particles on viscosity and elastic modulus in the steady-state flow process which was ignored in Maxwell-pulse model, was established. The fitting results of the true stress-strain curves of the modified Maxwell-pulse constitutive model were in better agreement with the experimental date than those of the Maxwell-pulse constitutive model, with higher prediction accuracy. The modified constitutive model well predicted the thermoplastic deformation behavior of(Zr55Cu30Al10Ni5)*** influence mechanism of Ta particles on the flow behavior was explained that Ta particles increased the viscosity of amorphous matrix, thereby hindering its flow and ultimately leading to an increase in flow stress.

关键词： Bulk metallic glass composites Supercooled liquid region Thermoplastic deformation Constitutive model Influence mechanism

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