跨国公司在华专利战略的变化研究

在经济全球化不断发展的大背景下,跨国公司更加重视技术战略的制定和运用。作为保持和加强在华技术领域垄断优势的重要手段,专利战略已经成为跨国公司技术战略的核心,日益受到跨国公司的重视。通过分析当前跨国公司在华专利战略的变化,这种变化对我国企业影响,对跨国公司在华专利战略的最新走向进行研究,并提出相应的策略及政策建议。     

Septal repair implants: evaluation of magnetic resonance imaging safety at 3 T

Specialized implants are used for transcatheter closure of septal defects, including atrial and ventricular septal defects, and patent foramen ovale. These metallic devices may pose a risk to patients undergoing magnetic resonance imaging (MRI) procedures especially if performed at 3 T. Therefore, this investigation evaluated MRI safety at 3 T for septal repair implants (CardioSEAL Septal Repair Implant and STARFlex Septal Repair Implant, NMT Medical, Boston, MA, USA) by characterizing magnetic field interactions, heating and artifacts. These implants exhibited minor magnetic field interactions; heating was not excessive (+0.5°C); and artifacts will only create a problem if the area of interest is in the same area as or near these devices. Thus, the findings indicated that it would be safe for a patient with these implants to undergo MRI at 3 T or lower. Importantly, because of the minor magnetic field interactions, MRI may be performed immediately after implantation.     

REGULARIZATION OF SINGULAR SYSTEMS BY OUTPUTFEEDBACK

1.IntroductionInthispaper,weconsideralineartime--invariaflt'system{EI;," "(1)withthematricesE,AER",BER"m,CeRP",alldEissingular.Thebehaviorofasingularsystemdependscriticallyontheeigenstructureofthepencil(E,A).Tilepencil(E,A)andthecorrespondingsystem(1)aresaidtoberegularifdet(orE--dA)/0forsome(a,0)eCZ(2)andtheyaresaidtohaveindexatmostoneifthedimensionofthelargestnilpotelltblock(whichcorrespondstoaninfinitepole)intheKroneckercanonicalformofthepencil(E,A)islessthanorequalto..e[3'12]…     

Dynamical Casimir–Polder force on a partially dressed atom in a cavity comprising a dielectric

We put a two-level atom into a cavity comprising a dielectric with output coupling. An analytical expression of the dynamical Casimir–Polder force in such a system is obtained when the system starts from a partially dressed state. And the effects of several relevant parameters of the system on the time-dependent force are also discussed.     

A New Energy Inversion for Parameter Identification in Saddle Point Problems with an Application to the Elasticity Imaging Inverse Problem of Predicting Tumor Location

The primary objective of this work is a detailed theoretical and computational study of the elasticity imaging inverse problem for tumor identification within the human body. Apart from this inverse problem's important and interesting application, it also poses noteworthy mathematical challenges since the underlying mathematical model is a system of elasticity involving incompressibility. This gives rise to the “locking” effect and special treatment is necessary for both the direct and inverse problems. To study the inverse problem in an optimization framework, we introduce a general computational scheme for handling parameter identification in saddle point problems along with the introduction and analysis of a new energy output least-squares objective functionals. We also present a treatment of the identification of discontinuous elasticity coefficients using the total variation regularization method. General formulas for the computation of the coefficient-to-solution map and a complete convergence analysis are given for the continuous problem as well as for its discrete analogue. Discrete formulas and implementation issues are discussed in detail and numerical examples for smooth and discontinuous coefficients are given.     

三模重叠双间隙耦合腔型输出回路的仿真设计

 为扩展速调管输出回路的带宽,进一步分析了双间隙耦合腔的模式重叠理论,说明了实现三模重叠的可能性,采用等效电路法计算了三模重叠双间隙耦合腔型输出回路的阻抗频率特性。以中心频率3 GHz的输出回路为例,建立了3维计算模型,给出了设计这种输出回路的步骤和结构参数。用场分析法计算了间隙阻抗频率特性,结果表明：此输出回路2 dB相对带宽接近15%,加载滤波器后1.5 dB相对带宽可达19.3%。     

Scaled and nonlinear multi-objective model for Downlink and Uplink exposure in massive MIMO

When designing wireless networks with a large number of wireless broadband devices, it is important to take into account the induced Uplink (UL) and Downlink (DL) exposure from base station broadcasting. This work focuses on the reduction of power consumption, low downlink and uplink electromagnetic exposure, and the optimization of locations and power levels of large Multiple Input–Multiple Output-Long Term Evolution base stations (MIMO-LTE). Additionally, it anticipates achieving maximum user coverage. In order to handle the power consumption and Electro Magnetic Field (EMF) exposure, a Nonlinear and Scaled Weight objective model (NLSW) is defined (DL and UL exposure). An enhanced Particle Swarm Optimization (PSO) technique is employed to resolve this optimization issue. Finally, DL exposure, UL exposure, and power performance of a NLSW are validated compared to the traditional linear model. Increased antenna leads to a 25% reduction in DL dosage. The minimum BS deployed in the area with the number of antenna elements until it reaches the ideal value is related to the UL exposure maximization.     

一种简单的大功率激光二级管阵列参量测试方法

本文详细介绍了一种测试大功率激光二极管阵列用金属光导管的设计原则及测试方法,它具有结构简单、操作方便、精度较高等一系列优点.文章最后还给出了通过这种方法测试大功率激光二极管阵列输出功率及发射光谱的一些实验结果.     

用灰色理论预测石油总产值

本文介绍了灰色理论及其建模方法,运用它建立了石油工业总产值的灰色预测模型,并与计量经济学模型比较,指出了对上下波功问题,建立灰色模型比建立计量经济学模型拟合程度高。同时用模型计算出了1988、1989、1990、1991等四年的石油工业总产值的预测值。本文最后指出了灰色模型的局限性,提出了克服这一局限性的方法。