检索结果-南通市图书馆

维普期刊数据库

HIGH cURRENT GAIN GaAs BIPOLAR TRANSISTORS WITH A Ga0.51In0.49P HOLE BARRIER

在线全文

学校读者我要写书评

暂无评论

HIGH CURRENT GAIN GaAs BIPOLAR TRANSISTORS WITH A Ga0.51In0....

Effect of Dietary Antibacterial Peptide and Zinc-methionine on Performance and Serum Biochemical Parameters in the Weaned Piglets*

The Third International conference on Solid State and Integrated circuit Technology

作者： S.S.LU c.c.wu National Taiwan University Dept. of Electrical Engineering No. 1 Sect. 4 Roosevelt Rd TaipeiTaiwan China National Taiwan University Dept. of Electrical Engineering No. 1 Sect. 4 Roosevelt Rd TaipeiTaiwan China

＜正＞ Emitter size effect on current gain of GaAs bipolar transistors with different GaInP hole barrier thickness （50 and 100A） was studied and compared with the results of conventional AlGaAs/GaAs heterojunction bipolar transistors（HBT）.It was found that the performance of the transistor with 100A GalnP barrier was comparable to the AlGaAs/GaAs graded base HBT while that of the transistor with 50A GalnP barrier was worse than the conventional AlGaAs/GaAs *** gain as high as 236 and offset voltage as small as 40mV were obtained in the device with 100A GaInP barrier.

关键词：

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Effect of Dietary Antibacterial Peptide and Zinc-methionine ...

作为向量推力装置的非对称折转片式喷管的研究

第五届中国畜牧科技论坛

作者： J.H.Wang c.c.wu J.Feng Laboratory of Medicinal chemistry Department of Bioengineering CollegeChongqing University

The objective of this study was to evaluate the effect of dietary supplementation of antibacterial peptide and zinc-methionine on performance and some serum biochemical parameters of weaned piglets. Rongchang male piglets(28 days of age,initial weight 8.4±0.65 Kg) were *** piglets were randomly allotted to four diets including the control group,the antibacterial peptide(AP) group containing 10 mg AP/kg diet, the zinc-methionine(Zn-Met) group with 1200 Zn-Met/kg diets(equal to 200mg Zn/kg diets),the Zn/AP group containing 10mg AP and 1200mg Zn-Met/kg diet,respectively,in a 4-week feeding *** of these groups consisted of six replications with 8 pigs per *** ADG and ADFI all improved for the AP group(P0.05,Pcompared with the *** joint use of Zn-Met and AP was synergetic(Pcreased(Pc decreased(Pcreased(Pcompared with the *** addition,the changes of serum TP and serum HDL for the control showed regularity during the *** results indicated that AP and ZnMet were effective in improving growth performance and some serum parameters levels of weaned piglets.

关键词： Antibacterial peptide Zinc Methionine Weaned piglet Performance Serum parameters

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

国外固体火箭技术 1986年第1期 32-43页

作者： c.c.wu 杨长仪

本文应用速矢变换法并结合有限差分计算求解非对称二维收敛喷管可压缩流问题。用给定适当的流动参数,在速度图的范围内首先确定问题的解。然后以直接积分求得相应的喷管结构和局部流场特性,还提出了在某些约束条件下向量推力的性能与结... 详细信息

本文应用速矢变换法并结合有限差分计算求解非对称二维收敛喷管可压缩流问题。用给定适当的流动参数,在速度图的范围内首先确定问题的解。然后以直接积分求得相应的喷管结构和局部流场特性,还提出了在某些约束条件下向量推力的性能与结构设计,为了验证起见,还进行了风洞实验以期获得沿喷管壁面的压力数据,结果表明理论数据与实测数据良好地吻合。

关键词：非对称方程式方程向量亚临界流喷管壁超临界流速度图速度三角形片式推力外力装置

轻型cOVID-19肺炎病人的cT表现演变

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

国际医学放射学杂志 2020年第6期 744-745页

作者：王慧慧 T.Liang Z.Liu c.c.wu c.Jin H.F.Zhao Y.Wang Department of Radiology The First Affiliated Hospital of Xi’an Jiaotong University

摘要目的描述轻型cOVID-19肺炎病人cT表现的演变。方法回顾性分析88例确诊为轻型cOVID-19肺炎病人的cT影像和临床病史,cT影像包括基线cT和至少1次随

关键词：

Prescribed-Time Nash Equilibrium Seeking for Pursuit-Evasion Game

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

IEEE/cAA Journal of Automatica Sinica 2024年第6期11卷 1518-1520页

作者： Lei Xue Jianfeng Ye Yongbao wu Jian Liu D.c.wunsch Key Laboratory of Measurement and control of complex Systems of Engineering Ministry of EducationNanjing 210096 School of Automation Southeast UniversityNanjing 210096China Department of Electrical and computer Engineering Missouri University of Science and TechnologyRollaMO 65409 USA IEEE

Dear Editor,This letter is concerned with prescribed-time Nash equilibrium(PTNE)seeking problem in a pursuit-evasion game(PEG)involving agents with second-order *** order to achieve the prior-given and user-defined convergence time for the PEG,a PTNE seeking algorithm has been developed to facilitate collaboration among multiple pursuers for capturing the evader without the need for any global ***,it is theoretically proved that the prescribedtime convergence of the designed algorithm for achieving Nash equilibrium of ***,the effectiveness of the PTNE method was validated by numerical simulation results.A PEG consists of two groups of agents:evaders and *** pursuers aim to capture the evaders through cooperative efforts,while the evaders strive to evade *** is a classic noncooperative *** has attracted plenty of attention due to its wide application scenarios,such as smart grids[1],formation control[2],[3],and spacecraft rendezvous[4].It is noteworthy that most previous research on seeking the Nash equilibrium of the game,where no agent has an incentive to change its actions,has focused on asymptotic and exponential convergence[5]-[7].

关键词： seeking prescribed convergence

维普期刊数据库

Adaptive neural network control of a 2-DOF helicopter system considering input constraints and global prescribed performance

在线全文

学校读者我要写书评

暂无评论

Science china(Information Sciences) 2024年第7期67卷 224-239页

作者： Zhijia ZHAO Jiale wu Zhijie LIU We HE c.L.Philip cHEN School of Mechanical and Electrical Engineering Guangzhou University School of Intelligence Science and Technology and Key Laboratory of Intelligent Bionic Unmanned Systems of Ministry of Education University of Science and Technology Beijing School of computer Science and Engineering South China University of Technology Pazhou Lab

In this study, an adaptive neural network(NN) control is proposed for nonlinear two-degree-offreedom(2-DOF) helicopter systems considering the input constraints and global prescribed ***, radial basis function NN(RBFNN) is employed to estimate the unknown dynamics of the helicopter system. Second, a smooth nonaffine function is exploited to approximate and address nonlinear constraint functions. Subsequently, a new prescribed function is proposed, and an original constrained error is transformed into an equivalent unconstrained error using the error transformation and barrier function transformation methods. The analysis of the established Lyapunov function proves that the controlled system is globally uniformly bounded. Finally, the simulation and experimental results on a constructed Quanser's test platform verify the rationality and feasibility of the proposed control.

关键词： adaptive NN control 2-DOF helicopter global prescribed performance input constraints

Liquefaction susceptibility and deformation characteristics of saturated coral sandy soils subjected to cyclic loadings-a critical review

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Earthquake Engineering and Engineering Vibration 2024年第1期23卷 261-296页

作者： chen Guoxing Qin You Ma Weijia Liang Ke wu Qi c.Hsein Juang Institute of Geotechnical Engineering Nanjing Tech UniversityNanjing 210009China civil Engineering and Earthquake Disaster Prevention center of Jiangsu Province Nanjing 210009China School of Mechanical Engineering Nanjing University of Science and TechnologyNanjing 210094China college of civil Aviation Nanjing University of Aeronautics and AstronauticsNanjing 210016China Glenn Department of civil Engineering Clemson UniversityClemsonSC 29634USA

coral sandy soils widely exist in coral island reefs and seashores in tropical and subtropical *** to the unique marine depositional environment of coral sandy soils,the engineering characteristics and responses of these soils subjected to monotonic and cyclic loadings have been a subject of intense interest among the geotechnical and earthquake engineering *** paper critically reviews the progress of experimental investigations on the undrained behavior of coral sandy soils under monotonic and cyclic loadings over the last three *** focus of coverage includes the contractive-dilative behavior,the pattern of excess pore-water pressure(EPWP)generation and the liquefaction mechanism and liquefaction resistance,the small-strain shear modulus and strain-dependent shear modulus and damping,the cyclic softening feature,and the anisotropic characteristics of undrained responses of saturated coral sandy *** particular,the advances made in the past decades are reviewed from the following aspects:(1)the characterization of factors that impact the mechanism and patterns of EPWP build-up;(2)the identification of liquefaction triggering in terms of the apparent viscosity and the average flow coefficient;(3)the establishment of the invariable form of strain-based,stress-based,or energy-based EPWP ratio formulas and the unique relationship between the new proxy of liquefaction resistance and the number of cycles required to reach liquefaction;(4)the establishment of the invariable form of the predictive formulas of small strain modulus and strain-dependent shear modulus;and(5)the investigation on the effects of stress-induced anisotropy on liquefaction susceptibility and dynamic deformation *** gained through the critical review of these advances in the past decades offer a perspective for future research to further resolve the fundamental issues concerning the liquefaction mechanism and responses of coral sandy sites subjecte

关键词： liquefaction susceptibility dynamic deformation characteristics coral sandy soil cyclic loading review and prospect

维普期刊数据库

Efficient guiding and focusing of intense laser pulse using periodic thin slits

在线全文

学校读者我要写书评

暂无评论

Matter and Radiation at Extremes 2024年第4期9卷 29-39页

作者： L.Xu T.W.Huang K.Jiang c.N.wu H.Peng P.c.hen R.Li H.B.Zhuo c.T.Zhou Shenzhen Key Laboratory of Ultraintense Laser and Advanced Material Technology Center for Intense Laser ApplicationTechnologyand College of Engineering PhysicsShenzhen Technology UniversityShenzhen 518118People’s Republic of China

Slits have been widely used in laser-plasma interactions as plasma optical components for generating high-harmonic light and controlling laser-driven particle ***,we propose and demonstrate that periodic thin slits can be regarded as a new breed of optical elements for efficient focusing and guiding of intense laser *** fundamental physics of intense laser interaction with thin slits is studied,and it is revealed that relativistic effects can lead to enhanced laser focusing far beyond the pure diffractive focusing *** addition,the interaction of an intense laser pulse with periodic thin slits makes it feasible to achieve multifold enhancement in both laser intensity and energy transfer efficiency compared with conventional *** results provide a novel method for manipulating ultra-intense laser pulses and should be of interest for many laser-based applications.

关键词： laser pulse intense

Single-cell RNA sequencing facilitates the elucidation of the complete biosynthesis of the antidepressant hyperforin in St. John's wort

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Molecular Plant 2024年第9期17卷 1439-1457页

作者： Song wu Ana Luisa Malaco Morotti Jun Yang Ertao Wang Evangelos c.Tatsis National Key Laboratory of Plant Molecular Genetics CASs Center for Excellence in Molecular Plant SciencesShanghai lnstitute of Plant Physiology and EcologyChineseAcademy of SciencesShanghai 200032China University of chinese Academy of Sciences Shanghai 200032China UEPAMS-cAS-JIcs centre of Excellencefor Plant anamlcroblalSclence Snangnal 200032Cnina

Hyperforin is the compound responsible for the effectiveness of ***'s wort(Hypericum perforatum)as an antidepressant,but its complete biosynthetic pathway remains *** discovery based on co-expression analysis of bulk RNA-sequencing data or genome mining failed to discover the missing steps in hyperforin *** this study,we sequenced the 1.54-Gb tetraploid *** genome assem-bled into 32 chromosomes with the scaffold N50 value of 42.44 *** single-cell RNA sequencing,we iden-tified a type of cell,“Hyper cells”,wherein hyperforin biosynthesis de novo takes place in both the leaves and *** pathway reconstitution in yeast and tobacco,we identified and characterized four transmembrane prenyltransferases(HpPT1-4)that are localized at the plastid envelope and complete the hyperforin biosynthetic *** hyperforin polycyclic scaffold is created by a reaction cascade involving an irregular isoprenoid coupling and a tandem *** findings reveal how and where hy-perforin is biosynthesized,enabling synthetic-biology reconstitution of the complete ***,this study not only deepens our comprehension of specialized metabolism at the cellularlevel but also provides strategic guidance for elucidation of the biosynthetic pathways of other specializied metabolites in plants.

关键词： hyperforin Hypericum perforatum de novo genome sequencing single-cell RNA sequencing biosyn-thetic pathway meroterpenoids