检索结果-南通市图书馆

Asymptotic Behavior of Global Classical Solutions of Quasilinear Non-strictly Hyperbolic Systems with Weakly Linear Degeneracy

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Chinese Annals of Mathematics,Series B 2006年第3期27卷 263-286页

作者： Wenrong dai Department of Mathematics Shanghai Jiao Tong University Shanghai 200240 China.

In this paper, we study the asymptotic behavior of global classical solutions of the Cauchy problem for general quasilinear hyperbolic systems with constant multiple and weakly linearly degenerate characteristic fields. Based on the existence of global classical solution proved by Zhou Yi et al., we show that, when t tends to infinity, the solution approaches a combination of C^1 travelling wave solutions, provided that the total variation and the L^1 norm of initial data are sufficiently small.

关键词： Asymptotic behavior Characteristic fields with constant multiplicity,Weakly linear degeneracy Global classical solution Normalized coordinates Travelling wave

Kinetics of testosterone recovery in clinically localized prostate cancer patients *** radical prostatectomy and subsequent short-term adjuvant androgen deprivation therapy

在线全文

学校读者我要写书评

暂无评论

Asian Journal of Andrology 2013年第4期15卷 466-470,I0006页

作者： Bo dai Department of Urology Fudan University Shanghai Cancer Center Shanghai 200032 China Department of Oncology Fudan University Shanghai Medical College Shanghai 200032 China and Department of Pathology Fudan University Shanghai Cancer Center Shanghai 200032 China

deprivation therapy （ADT） is a standard treatment for metastatic, recurrent and locally advanced prostate cancer （PCa）. The aim of this study is to investigate the timing and extent of testosterone recovery in clinically localized PCa patients treated with radical prostatectomy （RP） and subsequent short-term adjuvant ADT. A total of 95 localized PCa patients underwent RP and 9-month adjuvant ADT were included in this prospective study. Serum testosterone level was measured before adjuvant ADT, at ADT cessation, and at 1, 3, 6, 9 and 12 months after cessation of ADT. A Cox proportional hazards model was used to assess variables associated with the ti me of testosterone normalization. The results showed that median patient age was 67 years and median testosterone level before adjuvant ADT was 361 （230-905） ng d1-1. All patients finished 9-month adjuvant ADT and achieved castrate testosterone level. At 3 months after ADT cessation, testosterone recovered to supracastrate level in 97.9% patients and to normal level in 36.9% patients. The percentage of patients who recovered to normal testosterone level increased to 66.3%, 86.3% and 92.6% at 6, 9 and 12 months, respectively. Cox regression model found that higher baseline testosterone level （ 300 ng dl- 1） was the only variable associated with a shorter time to testosterone normalization （hazard ratio： 1.98; P -- 0.012）. In conclusion, in most patients, testosterone recovered to supracastrate level at 3 months and to normal level at 12 months after 9-month adjuvant ADT cessation. Patients with higher baseline testosterone level need shorter time of testosterone normalization.

关键词： androgen deprivation therapy (ADT) luteinizing hormone-releasing hormone prostatic neoplasms recovery of function testosterone

Seismic performance evaluation of water supply pipes installed in a full-scale RC frame structure based on a shaking table test

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

Earthquake Engineering and Engineering Vibration 2024年第1期23卷 163-178页

作者： Wu Houli Guo Endong Wang Jingyi dai Xin dai Chenxi Key Laboratory of Earthquake Engineering and Engineering Vibration Institute of Engineering MechanicsChina Earthquake AdministrationHarbin 150080China Key Laboratory of Earthquake Disaster Mitigation Ministry of Emergency ManagementHarbin 150080China

As an important part of nonstructural components,the seismic response of indoor water supply pipes deserves much *** paper presents shaking table test research on water supply pipes installed in a full-scale reinforced concrete(RC)frame *** material pipes and different methods for penetrating the reinforced concrete floors are combined to evaluate the difference in seismic *** response spectra and pipe acceleration amplification factors based on test data are discussed and compared with code provisions.A seismic fragility study of displacement demand is conducted based on numerical *** acceleration response and displacement response of different combinations are *** results show that the combination of different pipe materials and different passing-through methods can cause obvious differences in the seismic response of indoor riser pipes.

关键词： water supply pipe different materials shaking table test amplification factor seismic fragility

Heavy Traffic Limit Theorems for a Queue with Poisson ON/OFF Long-range Dependent Sources and General Service Time Distribution

在线全文

学校读者我要写书评

暂无评论

Acta Mathematicae Applicatae Sinica 2012年第4期28卷 807-822页

作者： Wan-yang dai Department of Mathematics and State Key Laboratory of Novel Software TechnologyNanjing University

In Internet environment, traffic flow to a link is typically modeled by superposition of ON/OFF based sources. During each ON-period for a particular source, packets arrive according to a Poisson process and packet sizes （hence service times） can be generally distributed. In this paper, we establish heavy traffic limit theorems to provide suitable approximations for the system under first-in first-out （FIFO） and work-conserving service discipline, which state that, when the lengths of both ON- and OFF-periods are lightly tailed, the sequences of the scaled queue length and workload processes converge weakly to short-range dependent reflecting Gaussian processes, and when the lengths of ON- and/or OFF-periods are heavily tailed with infinite variance, the sequences converge weakly to either reflecting fractional Brownian motions （FBMs） or certain type of long- range dependent reflecting Gaussian processes depending on the choice of scaling as the number of superposed sources tends to infinity. Moreover, the sequences exhibit a state space collapse-like property when the number of sources is large enough, which is a kind of extension of the well-known Little＇s law for M/M/1 queueing system. Theory to justify the approximations is based on appropriate heavy traffic conditions which essentially mean that the service rate closely approaches the arrival rate when the number of input sources tends to infinity.

关键词： reflecting fractional Brownian motion reflecting Gaussian process long-range dependence queueing process weak convergence

Stresses due to an adhesion crack in T-shaped junction of two orthotropic plates

在线全文

学校读者我要写书评

暂无评论

Acta Mechanica Sinica 2012年第2期28卷 419-423页

作者： dai-Heng Chen Department of Mechanical Engineering Tokyo University of Science 1-3 KagurazakaShinjuku-ku Tokyo 162-8601 Japan

The general solution of stresses is derived for a T-shaped junction of two thin plates with an adhesion crack. The plates are orthotropic. A shear force is applied on the crack surface. The analysis is based on the supposition that the stresses in each plate can be approximated by a plane stress condition. The results obtained are verified by numerical calculation of FEM.

关键词： Elasticity Crack Thin plate T-shaped Junc-tion Hilbert Problem

Absolute instability modes due to rescattering of stimulated Raman scattering in a large nonuniform plasma

在线全文

学校读者我要写书评

暂无评论

High Power Laser Science and Engineering 2019年第1期7卷 144-153页

作者： Yao Zhao Zhengming Sheng Suming Weng shengzhe Ji Jianqiang Zhu Key Laboratory of High Power Laser and Physics Shanghai Institute of Optics and Fine Mechanics Chinese Academy of Sciences Key Laboratory for Laser Plasmas (MoE) School of Physics and Astronomy Shanghai Jiao Tong University Collaborative Innovation Center of IFSA (CICIFSA) Shanghai Jiao Tong University SUPA Department of Physics University of Strathclyde Tsung-Dao Lee Institute Shanghai Jiao Tong University University of Chinese Academy of Sciences

Absolute instability modes due to secondary scattering of stimulated Raman scattering (SRS) in a large nonuniform plasma are studied theoretically and numerically. The backscattered light of convective SRS can be considered as a pump light with a finite bandwidth. The different frequency components of the backscattered light can be coupled to develop absolute SRS instability near their quarter-critical densities via rescattering process. The absolute SRS mode develops a Langmuir wave with a high phase velocity of about c/■ with c the light speed in vacuum. Given that most electrons are at low velocities in the linear stage, the absolute SRS mode grows with very weak Landau damping. When the interaction evolves into the nonlinear regime, the Langmuir wave can heat abundant electrons up to a few hundred ke V via the SRS rescattering. Our theoretical model is validated by particle-in-cell simulations. The absolute instabilities may play a considerable role in the experiments of inertial confinement fusion.

关键词： laser plasma interactions stimulated Raman scattering two plasmon decay instability hot electron

Designing nonlinear thermal devices and metamaterials under the Fourier law: A route to nonlinear thermotics

在线全文

学校读者我要写书评

暂无评论

Frontiers of physics 2021年第5期16卷 107-142页

作者： Gao-Le dai School of Sciences Nantong UniversityNantong226019China

Nonlinear heat transfer can be exploited to reveal novel transport phenomena and thus enhance people’s ability to manipulate heat flux at ***,there has not been a mature discipline called nonlinear thermotics like its counterpart in optics or acoustics to make a systematic summary of relevant *** the current review,we focus on recent progress in an important part of nonlinear heat transfer,i.e.,tailoring nonlinear thermal devices and metamaterials under the Fourier law,especially with temperature-dependent thermal *** will present the basic designing techniques including solving the equation directly and the transformation *** nonlinearity coming from multi-physical effects,and how to calculate effective properties of nonlinear conductive composites using the effective medium theory are also *** on these theories,researchers have successfully designed various functional materials and devices such as the thermal diodes,thermal transistors,thermal memory elements,energy-free thermostats,and intelligent thermal materials,and some of them have also been realized in ***,these phenomenological works can provide a feasible route for the development of nonlinear thermotics.

关键词： nonlinear thermotics thermal metamaterials thermal conduction thermal radiation thermal convection thermo-mechanical effects effective medium theory

Ideal Mixing of Scalar Mesons and Hyperon-Nucleon Interactio~

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 2010年第6期27卷 40-43页

作者： dai Lian-Rong Department of Physics Liaoning Normal University Dalian 116029

The mixing of scalar mesons is an open problem since their structure is unclear and controversial. By introducing the ideal mixing of scalar mesons, we dynamically investigate the hyperon-nucleon interaction in the ehiral SU （ 3 ） quark model by solving the resonating group method （RGM） equation. The results show that when the ideal mixing of scalar mesons is considered and the mass of a k meson is reduced to near 780 MeV, then the hyperonnucleon scattering data can be reasonably described in the ehiral SU（3） quark model. Hence we find that the experimental mass of the n meson is around 780 MeV, and fo（600） and fo（980） mesons are the ideal mixing of scalar singlet and octet mesons.

关键词： Mixing Models Weight

Construction of a universal recombinant expression vector that regulates the expression of human lysozyme in milk

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

Frontiers of Agricultural Science and Engineering 2018年第3期5卷 382-389页

作者： Shen LIU shengzhe SHANG Xuezhen YANG Huihua ZHANG Dan LU Ning LI School of Life Science and Engineering Foshan University State Key Laboratory of Agrobiotechnology China Agricultural University Shanghai Institute of Medical Genetics Shanghai Children's Hospital Shanghai Jiao Tong University

The mammary gland provides a novel method for producing recombinant proteins in milk of transgenic animals. A key component in the technology is the construction of an efficient milk expression vector. Here,we established a simple method to construct a milk expression vector, by a combination of homologous recombination and digestion-ligation. Our methodology is expected to have the advantages of both plasmid and bacterial artificial chromosome(BAC) vectors. The BAC of mouse whey acidic protein gene(mWAP) was modified twice by homologous recombination to produce a universal expression vector, and the human lysozyme gene(hLZ) was then inserted into the vector by a digestionligation method. The final vector containing the 8.5 kb mWAP 5′ promoter, 4.8 kb h LZ genomic DNA, and 8.0 kb m WAP 3′ genomic DNA was microinjected into pronuclei of fertilized mouse embryos, to successfully generate two transgenic mouse lines that expressed recombinant human lysozyme(rhLZ) in milk. The highest expression level of rhLZ was 0.45 g$L–1, and rhLZ exhibited the same antibacterial activity as native h LZ. Our results have provided a simple approach to construct a universal milk expression vector, and demonstrated that the resulting vector regulates the expression of hLZ in milk.

关键词： BAC recombinant methods gene expression human lysozyme transgenic mice milk expression vector