THE MODULUS OF CONVEXITY AND THE EQUIVALENT CONDITIONS OF UNIFORMLY NON-SQUARE SPACES

This paper shows that X is uniformly non-square iff P(η_o)】0 for someη_o∈(0,2).Thus X is super-reflexive if and only if for X there exists an equivalent normwhich meets the above condition.By virtue of the before mentioned result,the author derives the necessary,and suffi-cient conditions for X and l^p(X_j)being uniformly non-square,respectively,and gives acharacterization of finite-dimensional spaces which are uniformly non-square.

Dimension decomposition algorithm for multiple source localization using uniform circular array

A dimension decomposition(DIDE)method for multiple incoherent source localization using uniform circular array(UCA)is proposed.Due to the fact that the far-field signal can be considered as the state where the range parameter of the nearfield signal is infinite,the algorithm for the near-field source localization is also suitable for estimating the direction of arrival(DOA)of far-field signals.By decomposing the first and second exponent term of the steering vector,the three-dimensional(3-D)parameter is transformed into two-dimensional(2-D)and onedimensional(1-D)parameter estimation.First,by partitioning the received data,we exploit propagator to acquire the noise subspace.Next,the objective function is established and partial derivative is applied to acquire the spatial spectrum of 2-D DOA.At last,the estimated 2-D DOA is utilized to calculate the phase of the decomposed vector,and the least squares(LS)is performed to acquire the range parameters.In comparison to the existing algorithms,the proposed DIDE algorithm requires neither the eigendecomposition of covariance matrix nor the search process of range spatial spectrum,which can achieve satisfactory localization and reduce computational complexity.Simulations are implemented to illustrate the advantages of the proposed DIDE method.Moreover,simulations demonstrate that the proposed DIDE method can also classify the mixed far-field and near-field signals.

A NOTE IN APPROXIMATIVE COMPACTNESS AND MIDPOINT LOCALLY K-UNIFORM ROTUNDITY IN BANACH SPACES

In this article, we prove the following results： （1） A Banach space X is weak midpoint locally k-uniformly rotund if and only if every closed ball of X is an approximatively weakly compact k-Chebyshev set; （2） A Banach space X is midpoint locally k-uniformly rotund if and only if every closed ball of X is an approximatively compact k-Chebyshev set.

Generalized constrained multiobjective games in locally FC-uniform spaces

A new class of generalized constrained multiobjective games is introduced and studied in locally FC-uniform spaces without convexity structure where the number of players may be finite or infinite and all payoff functions get their values in an infinite-dimensional space. By using a Himmelberg type fixed point theorem in locally FC-uniform spaces due to author, some existence theorems of weak Paxeto equilibria for the generalized constrained multiobjective games are established in locally FC-uniform spaces. These theorems improve, unify and generalize the corresponding results in recent literatures.

EQUILIBRIUM EXISTENCE FOR MULTI-LEADER-FOLLOWER GENERALIZED CONSTRAINED MULTIOBJECTIVE GAMES IN LOCALLY FC-UNIFORM SPACES

In this article, we introduce and study some new classes of multi-leader-follower generalized constrained multiobjective games in locally FC-uniform spaces where the number of leaders and followers may be finite or infinite and the objective functions of the followers obtain their values in infinite-dimensional spaces. Each leader has a constrained correspondence. By using a collective fixed point theorem in locally FC-uniform spaces due to author, some existence theorems of equilibrium points for the multi-leader-follower generalized constrained multiobjective games are established under nonconvex settings. These results generalize some corresponding results in recent literature.

Uniformly Stable Positive Monotonic Solution of a Nonlocal Cauchy Problem

In this paper, we study the existence of a uniformly stable positive monotonic solution for the nonlocal Cauchy problem with the nonlocal condition

Maximal elements and generalized games involving condensing mappings in locally FC-uniform spaces and applications(Ⅰ)

First, the notions of the measure of noncompactness and condensing setvalued mappings are introduced in locally FC-uniform spaces without convexity structure. A new existence theorem of maximal elements of a family of set-valued mappings involving condensing mappings is proved in locally FC-uniform spaces. As applications, some new equilibrium existence theorems of generalized game involving condensing mappings are established in locally FC-uniform spaces. These results improve and generalize some known results in literature to locally FC-uniform spaces. Some further applications of our results to the systems of generalized vector quasi-equilibrium problems will be given in a follow-up paper.

Systems of generalized vector quasi-variational inclusions and systems of generalized vector quasi-optimization problems in locally FC-uniform spaces

In this paper, we introduce some new systems of generalized vector quasi-variational inclusion problems and system of generalized vector ideal （resp., proper, Pareto, weak） quasi-optimization problems in locally FC-uniform spaces without convexity structure. By using the KKM type theorem and Himmelberg type fixed point theorem proposed by the author, some new existence theorems of solutions for the systems of generalized vector quasi-variational inclusion problems are proved. As to its applications, we obtain some existence results of solutions for systems of generalized vector quasi-optimization problems.

A new method for uniform local heating deep in body using ultrasound phased-array system

A new method for targeted heating of deep tissue was developed by using an ultrasound phased-array system which can generate various multiple loci patterns by electronically changing its amplitude or phase pattern. This method involves using a technique of combining switching and rotating of multiple foei patterns to create a uniform temperature over tissue volumes in various size. Using this method, the target tissue deep in the body can be heated to a specified temperature, which gives conditions for thermo-sensi- tive liposomes release. A simulation study for a 108-element, spherically sectioned array was performed to determine an optimal heating scheme from a set of multiple focus fields which were produced by inputting different combinations of phases and amplitudes. Comparisons of a static multiple foei field, the switched fields and the switched-rotated fields indicated that the technique of combining switching and rotating of multiple foei patterns has advantages of both lowering the peak temperature and evening the temperature distribution. The simulation results also show that the therapeutic heating zones in various size （ Φ5mm ～40mm） with uniform temperature distributions can be obtained employing the combined method. These results offer significant data for desisting thermotherapy equipment for tumor-specific drug release with thermo-sensitive liposomes.

基于广义柔度曲率信息熵的板式轨道脱空损伤识别

板式轨道填充层作为轨道结构关键部位,在高频列车荷载和环境共同作用下出现脱空损伤,引起脱空位置轨道结构刚度改变。为有效检测板式轨道的轨道板脱空情况,采用数值仿真分析得到无砟轨道模态信息,利用轨道脱空区域广义柔度曲率局部峰值进行轨道脱空损伤识别。结合广义柔度、均匀荷载面(Uniform load surface, ULS)、曲率和局部信息熵,提出可定位损伤的ULS曲率信息熵,并在CRTS III板式轨道上进行验证。研究结果表明:广义柔度曲率利用轨道脱空前后模态信息计算轨道脱空损伤曲率差,能够有效定位脱空位置;ULS曲率信息熵表征值只需要轨道的一阶模态信息便能够有效地反映轨道脱空位置及面积,且克服了广义柔度曲率需要健康模态信息的不足;轨道对称位置上相同面积脱空的ULS曲率信息熵值相同;ULS曲率信息熵值与脱空面积和厚度成正相关关系;ULS曲率信息熵表征值具有较好的损伤识别敏感性,能够识别小于单个测点布置面积的0.1 m×0.1 m小面积脱空,并且对轨道板边脱空识别敏感性高于轨道板中脱空识别敏感性。

台阶式沉井等效墩宽计算方法探究

桥梁工程中存在形状各异的桥墩,在研究不同截面桥墩的局部冲刷特性时,桥墩尺寸的定量描述非常重要。以台阶式沉井结构为研究对象,梳理并分析了国内外相关等效桥墩宽度计算方法,发现各类公式本质上为计算不同条件下的桥墩平均阻水宽度。开展了台阶式沉井局部冲刷试验研究,基于试验数据对比分析了各类等效墩宽计算方法的计算结果,发现Melville和Raudkivi的等效墩宽计算公式能够较好地估算考虑动床条件下台阶式沉井的平均阻水宽度;进一步收集了国内外193组台阶式沉井类结构的局部冲刷试验数据,数据集统计分析结果显示Melville和Randkivi的等效墩宽计算公式能够较为准确且保守地量化大多数台阶式沉井类结构的截面非均匀性;最后基于数据集冲深墩宽比统计结果对该公式近似方法的合理性进行了讨论。

超长滤袋局部加密对滤袋表面过滤风速分布的影响

针对超长滤袋表面过滤风速沿其轴向分布极为不均的问题,采用数值模拟方法探究了超长滤袋局部加密对滤袋表面过滤风速分布的影响,为提升超长滤袋袋式除尘器的过滤性能寻求解决方法。结果表明:当超长滤袋未进行局部加密时,滤袋表面过滤风速沿其轴向自上而下呈递减趋势,最大过滤风速高达3.18 m/min(设计过滤风速为1.0 m/min),对应过滤风速分布均匀性指数为0.122,过滤风速分布极不均匀,此时滤袋顶部受到高速气流的冲刷作用明显;当对超长滤袋顶部30%长度滤袋进行局部加密后,滤袋表面过滤风速分布均匀性得到显著提升;当局部加密孔隙率由85%降至60%时,滤袋表面过滤风速分布均匀性指数由0.037先增至0.518后降至0.434,对应除尘效率并不受影响;当局部加密孔隙率取值为65%时,滤袋表面最大过滤风速降至2.1 m/min,此时过滤风速分布均匀性指数达到最大值0.518。

具有局部阻尼的二维Mindlin-Timoshenko板系统的镇定

该文研究了具有局部阻尼的二维Mindlin-Timoshenko板系统,首先将原系统转化成抽象柯西问题,运用算子半群理论得到了系统的适定性.借助系统频域稳定性结果,通过引入几何光学条件结合乘子技巧得到了系统的一致指数稳定性.

局域共振弹性超材料梁禁带宽度的拓宽方法

针对传统局域共振弹性超材料存在禁带宽度窄的问题,引入非均匀分布振子设计方法,在不改变振子总质量的前提下实现了禁带拓宽。首先,采用谱元法(SEM)建立通用弹性超材料梁模型,对单、双层均匀振子超材料梁结构的振动传递特性进行分析;然后,保持振子总质量相等,提出单、双层非均匀振子超材料梁的设计策略;最后,搭建实验装置对所提结构的振动抑制性能进行测试。研究结果表明:振子间的特征频率差异越大,最终形成的禁带宽度越宽,但禁带范围内的频响曲线会大幅波动,此时可通过加入适当阻尼进行抑制,使禁带曲线变得平稳;对于双振子超材料梁,振子的质量比和阻尼均会对结构的禁带特性产生影响,在振子与梁质量相同的条件下,单层非均匀及均匀振子超材料梁可分别形成带宽为440、68 Hz的禁带,双层非均匀及均匀振子超材料梁可分别形成带宽为395、40 Hz的禁带。研究表明所提超材料结构能够有效实现振动抑制,可为周期结构的振动问题提供一种新的调控方法。

地面局部辐射供暖典型热环境特征化表征研究

局部精细化采暖是满足室内人员舒适前提下降低采暖能耗、实现采暖能源高效利用的重要方式之一.为提高采暖效率,给精细化辐射供暖提供方法参考,本文选取具有显著工位布局要求的办公场所作为对象,对地面局部辐射供暖模块影响下,室内不同区域热环境分布情况进行典型化研究分析,得到了不同局部模块供暖工况下室内非均匀热环境分布特征.分析结果表明,局部辐射面积为16.7%时辐射区域与非辐射区域平均辐射温度相差3℃以上,具有明显的局部环境营造效果;地面局部辐射供暖辐射区域与非辐射区域不对称辐射温度差异显著;将局部辐射源设置在靠近外墙区域,可以提高整体平均辐射温度,使室内平均辐射温度分布更为均匀.本研究初步给出基于地面局部辐射供暖的典型化热环境共性特征表述,可为后续局部辐射供暖系统的精细化设计提供参考.

一种基于非均匀线性麦克风阵列的窄带声源定向方法及系统

提出了一种基于窄带信号相位时延估计的信号定位方法,通过非均匀线性阵列的布放,解决增大阵元孔径带来的相位卷绕问题,提高定位精度。提出了非均匀线性布阵方式情况下,修正卷绕量计算延时量的估计算法,并给出了非均匀阵列间距需要满足的条件。此方法提高了定位可用基阵孔径,与一般均匀间隔线性阵列相比,大大减少了同孔径下所需的阵元个数,从而降低了对后续信号处理设备的需求。构建了定位系统并进行实际测试。实验表明,所提方法有效地提高了在开放空间中对窄带声源的定位精度。

迭代函数方程的同胚解

已有的迭代函数方程解结论主要是关于它的连续性和光滑性.然而在函数方程与动力系统的共轭和线性化理论研究中,解的同胚性质起到重要作用.对这一问题虽然已取得部分结论,但还未有一个完整的描述.该文首先利用构造和逼近的方法考虑一般类型的迭代函数方程的同胚解,然后将得到的结论应用到研究多项式型迭代方程.

大型直齿圆柱齿轮局部感应加热过程的数值模拟

大型齿轮的表面局部强化是提高其使用寿命的强化方法之一。应用一种新型感应加热装置对钢板进行局部加热试验,并应用ANSYS APDL对其过程进行数值模拟,验证模型可靠性。在此基础上对大型直齿轮的局部感应加热过程中的温度场及应力场进行模拟仿真求解,对比分析两种加热方案的温度均匀性和应力均匀性。结果表明:此新型感应加热装置对齿轮感应加热效率较高;第5 s时两种方案的温度均匀性分别为92.62%和90.28%;应力均匀性分别为91.78%和97.9%,温度均匀性和热应力均匀性变化趋势不同步。

基于Uniform LBP和DMMA的单样本人脸识别

在单样本人脸识别系统中,为了获得更好的人脸面部特征,提出了一种融合Uniform LBP特征和多流形判别分析(Discriminative Multi-Manifold Analysis,DMMA)的特征提取方法。对每幅人脸图像进行分块构成一个子集。使用统一局部二值模式(Uniform LBP)算子提取每个子集中图像的直方图,每个子集中的直方图形成一个统计流形,应用DMMA算法获得人脸图像的低维特征。采用基于重建的流形-流形间的距离识别未知的人脸图像。在AR数据库和ORL数据库上实验结果表明,该算法的识别性能优于一般的DMMA算法。

离子液吸收系统电除雾器腐蚀原因分析及改进措施

介绍了国内某石化公司的煤制氢离子液吸收系统洗涤塔顶部电除雾器连接腔及绝缘子腐蚀并损坏的情况,通过宏观、低倍分析、材质分析、金相检验、电镜分析、XRD分析等理化分析,确定电除雾器腐蚀物为铁及亚铁的硫酸盐化合物,判断腐蚀的起因是由于洗涤塔内酸性气体反窜至电除雾器连接腔及绝缘室,酸性气体在连接腔内40℃环境下形成稀硫酸溶液,黏附烟气中灰尘形成糊状垢物,对连接腔体造成严重腐蚀及污染电除雾器的绝缘子,导致碳钢材质的连接腔在酸性介质条件下发生均匀腐蚀、局部点蚀及绝缘子受污染放电碎裂损坏。根据所得结论,采取有效的改进措施,确保离子液吸收系统设备平稳、安全运行。