EQUATIONS OF MOTION AND BOUNDARY CONDITIONS OF INCREMENTAL RATE TYPE FOR POLAR CONTINUA

The relations between various couple stress tensors and their change rates are derived. The equations of angular momentum and the corresponding boundary conditions of incremental rate type are presented. Thus the equations of motion and the boundary conditions of incremental rate type of Cauchy form, Piola form and Kirchhoff from for polar continua are obtained in combination of these results with those for classical continuum mechanics derived by kuang Zhenbang.

Efficient Rate Control for Motion JPEG2000 under Constraint Memory

Fine scalability can provide not only precise rate control for constant bitrate (CBR) traffic, but also accurate quality control for variable bitrate (VBR) traffic. Motion JPEG2000 is a codec that can provide fine scalability with bitstreams. An efficient rate control approach utilizing a single buffer and two kinds of threshold for Motion JPEG2000 under resource constraint was proposed, which can offer good result in the constant quality video.

Rate efect and coupled evolution of atomic motions and potential landscapes

Since rate effect of materials plays a key role in impact engineering, the microscopic mechanism of rate effect is investigated at molecular level in this paper. The results show that rate effect on the strength of atomic system is closely related to the coupled evolution of atomic motions and potential landscapes. Accordingly, it becomes possible to develop a new algorithm of molecular simulation, which could properly and efficiently demonstrate strain rate effect under a wide range of loading rates and unveil the mecha- nisms underlying the strain rate effects.

Effect of varying normal stress on stability and dynamic motion of a spring-slider system with rate- and state-dependent friction

Incorporating rate and state friction laws, stability of linearly stable （i.e., with stiffness greater than the critical value） spring-slider systems subjected to triggering perturbations was analyzed under variable normal stress condition, and comparison was made between our results and that of fixed normal stress cases revealed in previous studies. For systems associated with the slip law, the critical mag- nitude of rate steps for triggering unstable slips are found to have a similar pattern to the fixed normal stress case, and the critical velocity steps scale with a/（b - a） when k = kcr for both cases. The rate-step boundaries for the variable normal stress cases are revealed to be lower than the fixed normal stress case by 7 %-16 % for a relatively large ct = 0.56 with （b - a）/a ranging from 0.25 to 1, indicating easier triggering under the variable normal stress condition with rate steps. The difference between fixed and variable normal stress cases decreases when the α value is smaller. In the same slip- law-type systems, critical displacements to trigger instability are revealed to be little affected by the variable normal stress condition. When k 〉 kcr（V,）, a spring-slider system with the slowness law is much more stable than with the slip law,suggesting that the slowness law fits experimental data better when a single state variable is adopted. In stick-slip motions, the variable normal stress case has larger stress drops than the constant normal stress case. The variable normal stress has little effect on the range of slip velocity in systems associated with the slowness law, whereas systems associated with the slip law have a slowest slip velocity immensely smaller than the fixed normal stress case, by ~ 10 orders of magnitude.

AN EFFICIENT BIT RATE ALLOCATION ALGORITHM FOR MOTION JPEG2000 TRANSPORT IN TILE ENCODING

An efficient bit rate allocation algorithm for video sequence transmission in motion JPEG2000 is presented. In many cases,the moving portions of video are often the interested regions. Based on tile encoding of JPEG2000,the important regions are discerned by two parameters. One is the complexity of a tile;the other is the motion activity of a tile. Thus an adaptive rate-allocation is re-alized in a lower complexity and the perceptive quality of a frame is improved. Experimental results show the effectiveness of this algorithm.

Very Low Bit Rate Video Coding Using Motion Compensated 3 D Wavelet Transform

A new motion compensated 3 D wavelet transform (MC 3DWT) video coding scheme is presented in this paper. The new coding scheme has a good performance in average PSNR, compression ratio and visual quality of reconstructions compared with the existing 3 D wavelet transform (3DWT) coding methods and motion compensated 2 D wavelet transform (MC WT) coding method. The new MC 3DWT coding scheme is suitable for very low bit rate video coding.

Pricing Study on Two Kinds of Power Options in Jump-Diffusion Models with Fractional Brownian Motion and Stochastic Rate

In this paper, under the assumption that the exchange rate follows the extended Vasicek model, the pricing of the reset option in FBM model is investigated. Some interesting themes such as closed-form formulas for the reset option with a single reset date and the phenomena of delta of the reset jumps existing in the reset option during the reset date are discussed. The closed-form formulae of pricing for two kinds of power options are derived in the end.

保乳术联合乳腔镜腋窝淋巴结清扫术治疗早期乳腺癌的效果

目的探讨保乳术联合乳腔镜腋窝淋巴结清扫术治疗早期乳腺癌的效果。方法选取2021年9月至2022年12月淄博市妇幼保健院乳腺甲状腺外科收治的66例早期乳腺癌患者作为研究对象,按照单双号分组法分为对照组和观察组,每组各33例。对照组行保乳术联合常规腋窝淋巴结清扫术,观察组行保乳术联合乳腔镜腋窝淋巴结清扫术。比较两组肩关节活动度、并发症总发生率、引流管留置时间及术后引流量。结果术后3个月,两组肩关节活动度均小于术前,但观察组大于对照组(P<0.05)。观察组并发症总发生率低于对照组(P<0.05)。观察组引流管留置时间短于对照组,术后引流量少于对照组(P<0.05)。结论保乳术联合乳腔镜腋窝淋巴结清扫术治疗早期乳腺癌,可减少对肩关节活动度的影响,降低并发症发生率,缩短引流管留置时间,减少术后引流量,值得临床推广。

底吹气泡运动行为及其对混匀影响的水模实验

建立底吹金属熔池水模实验平台,采用高速摄影技术及图像处理手段,分析了狭缝宽度和底吹流量对气泡的大小、数量、速度、受力的影响规律;通过测量溶液内电导率的变化来反映溶液的混匀情况,明确底吹结构和参数对溶液的搅拌强度。结果表明,气泡运动主要受浮力和曳力的影响,气泡的索特直径随狭缝宽度、底吹流量的增大而增大,气泡越大越有利于溶液搅拌,从而缩短混匀时间,而气泡数量的变化趋势则与之相反;气泡上升速度与底吹流量成正比,与狭缝宽度成反比;结果表明,当狭缝宽度为0.30 mm,底吹流量为1.00 L/min时,混匀时间最短。

年轻态势下的体感游戏运动效果及强度研究

目的:探究年轻化模式下的体感游戏对于青少年人群运动的心率影响和运动强度研究,探究体感游戏模式下的运动效果。方法:本研究共招募20名12~22周岁,BMI均处于正常范围内的受试者参与完成A组体感游戏《健身环大冒险》及B组体感游戏《Just Dance》,运用Mac1200心电监护仪检测各项心率数据,包括静息心率、最大心率、游戏平均心率,并参照运动强度划分区域来检测两项体感游戏的运动强度效果,以及对比强少年男女组别在参与体感游戏下的运动差异。结果:A组游戏中男女组别的精息心率、最大心率、游戏平均心率,游戏最大心率的p值分别为0.592、0.545、0.982、0.601,均无显著差异;B组实验中男女组别的精息心率、最大心率、游戏平均心率,游戏最大心率的p值分别为0.985、0.908、0.018、0.006,其中游戏平均心率和游戏最大心率具备显著差异。从运动强度来看A组B组男女运动强度均处在50%~69%的中等强度区域。结论:A、B组体感游戏可以提供中等强度的运动效果,从游戏平均心率和游戏最大心率来看,B组舞蹈类游戏强少年男女呈现显著差异,从游戏心率均值数据来看,体感游戏可以达到一定的运动效果。

基于Motion JPEG2000的分布式无线传感器网络视频压缩新算法

在保证传输图像质量的前提下最小化能量消耗,是基于无线传感器网络(WSN)的视频监视系统设计中的一个关键问题。本文针对WSN结构特点,提出了一种分布式视频压缩算法。该算法基于Motion JPEG2000的分片编码方式,定义了两个参数来判定视频序列中一帧图像区域的重要性大小,一个是片的复杂度,另一个是片的运动程度。从而以低复杂度算法实现了自适应的码率分配。文中基于此算法提出WSN构建方案。仿真实验结果表明,本文提出的分布式视频压缩方案,能有效减小WSN中数据传输能量消耗,同时得到较好的图像重建效果。

心脏超声检查在冠心病节段性室壁运动异常中的应用

目的探讨冠心病节段性室壁运动异常诊断中心脏超声检查的应用价值,旨在为后续诊断及治疗工作提供参考价值。方法选取2021年10月—2023年10月漳州正兴医院超声科100例疑似冠心病节段性室壁运动异常者相关数据进行分析。以心脏冠状动脉造影为诊断“金标准”,所有入组者均实施心脏超声检查,对心脏超声检查的诊断价值进行分析,记录冠心病节段性室壁运动异常检出率、不良反应发生情况。结果不同诊断方法下冠心病节段性室壁运动异常检出率比较,差异无统计学意义(P>0.05);心脏超声检查的阳性预测值、特异度、阴性预测值、敏感度、准确度分别为98.82%(84/85)、90.90%(10/11)、66.67%(10/15)、94.38%(84/89)、94.00%(94/100),心脏超声检查的诊断价值较高;心脏超声检查下不良反应总发生率低于心脏冠状动脉造影检查,差异有统计学意义(P<0.05)。结论心脏超声检查的检出率较高,不良反应发生率低,具有较高的特异度、阳性预测值、准确度、阴性预测值、敏感度,对后续针对性治疗具有积极意义。

新型过载驾驶仪滚转弹制导系统稳定性研究

针对平台式图像导引头实际应用中的隔离度寄生回路问题,基于新型过载驾驶仪开展了滚转弹锥形运动的动态稳定性研究。根据滚转弹体的线性动力学模型,引入加速度反馈增稳的新型过载驾驶仪,构建了考虑平台图像导引头隔离度寄生回路的滚转弹体制导系统模型,推导了新型过载驾驶仪滚转弹制导系统的动态稳定性条件。分析了隔离度、舵机总延迟角等重要参数对包含隔离度寄生回路的滚转弹体动态稳定域的影响。研究表明:滚转效应、寄生效应与控制指令延迟是导致驾驶仪参数设计稳定域减小的主要因素,制导系统设计参数应远离稳定性边界从而提升锥形运动稳定性。

基于帧间相关性的Motion JPEG2000的码率控制算法

基于图像序列的前后帧之间存在的相关性,提出了恒定码率编码时一种高效的Motion JPEG2000码率控制算法,有效地减少了需编码的编码通道数和熵编码的计算冗余,提高了编码速度,降低了存储资源占用。实验结果表明,当码率1.2bpp时,测试序列需编码的编码通道数比PCRD算法平均减少了约52.3%,而峰值信噪比(PSNR)平均仅降低了0.0553dB。

实时Motion JPEG2000视频编码系统设计

介绍了基于ADV202JPEG2000编码芯片的MotionJPEG2000视频编码系统,该系统可实现SMPTE274M的实时编码,支持失真/无失真编码,与标准完全兼容。给出了系统硬件结构和软件流程设计,提出了一种利用帧间相关性减少编码计算量的码率控制方法。

An investigation using high-precision CCD laser displacement sensor to measure body surface motion induced by heartbeat

The aim of this study was to measure the motion of the body surface induced by heartbeat by using a high-precision laser sensor in order to provide a reference for other research on medical remote sensing techniques that are unconstrained and non-contact. Body surface motions at some points on the chest and on the dorsal region were measured for eight men with a laser displacement sensor. For comparison, an electrocardiograph was also used to monitor the heartbeat. As a result, we confirmed cyclic motion of about 0.1 mm in amplitude everywhere on the body surface, not only from the front of the body but also from the back and the neck. In contrast, which part on the body was most suitable for measurement had to be taken into account because a difference in motion amplitudes was observed in different parts on the body. The amplitude of the motions also depended on the conditions of the body surface as well as underneath the skin. These results show the possibility of acquiring information about heartbeats from anywhere on the body by using an unconscious sensing technique, and the potential for the technique to monitor the condition of the body and personal physical characteristics.

CONVERGENCE RATE OF AN APPROXIMATION TO MULTIPLE INTEGRAL OF FBM

In this article, we study the rate of convergence of the polygonal approximation to multiple stochastic integral Sp （f） of fractional Brownian motion of Hurst parameter H 〈 1/2 when the fractional Brownian motion is replaced by its polygonal approximation. Under different conditions on f and for different p, we obtain different rates.

One Dimensional Random Motion on Segment with Reflecting Edges and Dependent Increments

In previous papers, the author considered the model of anomalous diffusion, defined by stable random process on an interval with reflecting edges. Estimates of the rate convergence of this process distribution to a uniform distribution are constructed. However, recent physical studies require consideration of models of diffusion, defined not only by stable random process with independent increments but multivariate fractional Brownian motion with dependent increments. This task requires the development of special mathematical techniques evaluation of the rate of convergence of the distribution of multivariate Brownian motion in a segment with reflecting boundaries to the limit. In the present work, this technology is developed and a power estimate of the rate of convergence to the limiting uniform distribution is built.

CONVERGENCE RATE OF MULTIPLE FRACTIONAL STRATONOVICH TYPE INTEGRAL FOR HURST PARAMETER LESS THAN 1/2

In this paper, we have investigated the problem of the convergence rate of the multiple integralwhere f ∈ Cn＋1（[0, T ]n） is a given function, π is a partition of the interval [0, T ] and {BtHi ,π} is a family of interpolation approximation of fractional Brownian motion BtH with Hurst parameter H 1/2. The limit process is the multiple Stratonovich integral of the function f . In view of known results, the convergence rate is different for different multiplicity n. Under some mild conditions, we obtain that the uniform convergence rate is 2H in the mean square sense, where is the norm of the partition generating the approximations.