糖尿病患者231例神经传导速度、F-波和H-反射观察

目的观察分析糖尿病患者上肢与下肢神经近段及远端、神经末梢的受损程度。方法对231例糖尿病患者的上肢与下肢感觉神经传导速度(SCV)及运动神经传导速度(MCV)、F-波及H-反射的检测异常率比较进行研究分析。结果下肢腓肠神经SCV异常率91.8%,明显高于上肢正中神经SCV异常率72.6%(P<0.001)。而上肢正中神经MCV远端PL异常率达37.2%;下肢腓总MCV远端PL异常率达30.2%(P<0.14)。上肢正中神经肘-腕MCV异常率达56.2%;下肢腓总神经腓骨小头下2cm—中踝MCV异常率达60.1%(P<0.45)。上肢正中神经腋-肘MCV异常率达6%;下肢腓总神经腓骨小头上9cm—腓骨小头下2cmMCV异常率达25.1%(P<0.001)。尺神经F-波异常率达23.4%,胫神经H-反射异常率达63.3%(P<0.001)。结论糖尿病患者神经病变累及部位以下肢为主;以感觉神经多于运动神经。在患者临床症状较轻或缺如时,应用NCV、F-波和H-反射检测可以客观的对糖尿病患者神经近段及远端、神经末梢的受损不同程度进行评价。

枕骨粗隆处磁刺激对F-波的影响

目的 :了解中枢神经系统磁刺激对 F-波的影响。方法 :在枕骨粗隆处用 8字形磁刺激头施行磁刺激 ,在右腕关节处尺神经上施与电刺激 ,在右手第一背侧骨间肌记录肌肉活动电位。分别记录刺激间隔为 30、5 0、10 0、30 0 ms及磁刺激施行前后的F-波。每个实验条件下记录 10个 F-波。观察 F-波的最小潜伏期 ;F-波的波幅与 M-波波幅之比 ;F-波的平均持续时间及 F-出现频率 ,并与实验前进行比较。结果 :用 8字形磁刺激头在枕骨粗隆处刺激时 ,经过一定的时间间隔可以明显增大 F-波的兴奋性 ,表现为 F-波的波幅增高 ,平均持续时间延长和出现频率明显增大 ,而对 F-波的最短潜伏期没有明显的影响。结论 :在枕骨粗隆处施行的磁刺激经过一定的时间间隔可以明显改变 F-波的兴奋性。

颈腰髓损伤患者F-波变化及其与预后的关系

目的探讨颈腰髓损伤患者F-波变化及其与预后的关系。方法收集63例颈腰髓损伤患者,对其F-波检查结果进行分析,并对F-波检查异常程度与患者恢复随访情况进行比较。结果初始F-波正常者预后较好,F-波延长的患者有不同程度的恢复,延长的程度与预后相关,F-波消失的患者预后较差。结论F-波检查对颈腰髓损伤患者的预后评价有一定的价值。

H-反射和F-波近期部分研究

本文介绍近期有关H-反射和F-波的资料,涉及检查方法和临床应用问题。内容比较新,有参考和使用价值,如应用F-波计算运动单位数检查偏瘫病人颇有新意。

F-波在临床神经电生理中的应用

1950年,Ｍａｙｌａｄｅｒｙ和Ｍｃｄｏｕｇａｌ首先提出了Ｆ-波(Ｆｗａｖｅ)的概念,认为Ｆ-波为周围神经接受电刺激后而出现的晚期肌肉反应。70年代后,许多学者对Ｆ-波进行了研究,证实Ｆ-波是周围神经接受超强刺激后,神经冲动逆行沿近端向脊髓传导,兴奋前角细胞后返回的电...

药物注射性坐骨神经损伤F波传导速度分析

目的 探讨药物注射性坐骨神经损伤F波传导速度变化规律及特点。方法 收集药物注射性坐骨神经损伤患者 5 7例 ,全部患者均进行了F波传导速度检测 ,对其F波传导速度进行回顾性分析。结果 患者注射抗生素药物当时或注射后很快出现注射下肢不同程度的感觉和运动功能障碍 ,此类事件多发生在乡村卫生院或小诊所 ,患者多为儿童。腓总神经及胫神经损伤F波传导速度均低于正常值 (P <0 .0 1)。结论 药物注射性坐骨神经F波传导速度有其典型特点 ,掌握其规律及特点 ,对实际临床法医学鉴定有很大的应用价值。

Spin-Polarized Tunneling Spectroscopy and Shot Noise in Ferromagnet／f-WaveSuperconductor Junctions

The tunneling spectroscopy and shot noise in ferromagnet/insulator/triplet-superconductor (FM/I/triplet- SC) structures are studied by taking into account the roughness interracial barrier and exchange splitting in the FM. For the triplet-SG of Sr_2RuO_4,we consider two-dimensional f-wave order parameter symmetries having nodes within the RuO_2 plane,which reasonably describe both thermodynamic and thermal conductivity data.It is shown that the ferromagnetic exchange splitting gives rise to a decrease in the differential conductance,the average current,and the shot noise power,while the noise power-to-current ratio is increased;the interface roughness is found to lead to a decrease in the differential conductance and the average current,and an increase in the noise power-to-current ratio.

Applications of F-expansion to Periodic Wave Solutions for Variant Boussinesq Equations

We present an F-expansion method for finding periodic wave solutions of nonlinear evolution equations in mathematical physics, which can be thought of as a concentration of extended Jacobi elliptic function expansion method proposed recently. By using the F-expansion, without calculating Jacobi elliptic functions, we obtain simultaneously many periodic wave solutions expressed by various Jacobi elliptic functions for the variant Boussinesq equations. When the modulus m approaches 1 and O, the hyperbolic function solutions （including the solitary wave solutions） and trigonometric solutions are also given respectively.

A Generalized Extended F-Expansion Method and Its Application in （2＋1）-Dimensional Dispersive Long Wave Equation

A new generalized extended F-expansion method is presented for finding periodic wave solutions of nonlinear evolution equations in mathematical physics. As an application of this method, we study the （2＋1）-dimensional dispersive long wave equation. With the aid of computerized symbolic computation, a number of doubly periodic wave solutions expressed by various Jacobi elliptic functions are obtained. In the limit cases, the solitary wave solutions are derived as well.

神经肌电图检测对格林-巴利综合征的诊断价值

目的 :探讨格林 -巴利综合征的电生理改变特点。方法 :对 30例格林 -巴利综合征患者进行神经传导速度、肌电图和F波检测。结果 :30例格林 -巴利综合征患者检测均以周围神经脱髓鞘为主的特点。神经传导速度表现为 :周围神经运动和感觉传导速度减慢 ,末端潜伏期延长 ,异常率为 10 0 % ;肌电图表现为 :神经源性改变 ,异常率 93% ;F波出现率降低 ,潜伏期延长或消失 ,异常率 10 0 %。结论 :神经肌电图电生理检测在格林-巴利综合征诊断中起着重要的作用 ,对于格林 -巴利综合征的诊断及预后具有重要价值。

Random noise attenuation by f–x spatial projection-based complex empirical mode decomposition predictive filtering

The frequency–space（f–x） empirical mode decomposition（EMD） denoising method has two limitations when applied to nonstationary seismic data. First, subtracting the first intrinsic mode function（IMF） results in signal damage and limited denoising. Second, decomposing the real and imaginary parts of complex data may lead to inconsistent decomposition numbers. Thus, we propose a new method named f–x spatial projection-based complex empirical mode decomposition（CEMD） prediction filtering. The proposed approach directly decomposes complex seismic data into a series of complex IMFs（CIMFs） using the spatial projection-based CEMD algorithm and then applies f–x predictive filtering to the stationary CIMFs to improve the signal-to-noise ratio. Synthetic and real data examples were used to demonstrate the performance of the new method in random noise attenuation and seismic signal preservation.

Ground-roll attenuation using modified common-offset–common-reflection-surface stacking

We modified the common-offset-common-reflection-surface （COCRS） method to attenuate ground roll, the coherent noise typically generated by a low-velocity, low-frequency, and high-amplitude Rayleigh wave. The COCRS operator is based on hyperbolas, thus it fits events with hyperbolic traveltimes such as reflection events in prestack data. Conversely, ground roll is linear in the common-midpoint （CMP） and common-shot gathers and can be distinguished and attenuated by the COCRS operator. Thus, we search for the dip and curvature of the reflections in the common-shot gathers prior to the common-offset section. Because it is desirable to minimize the damage to the reflection amplitudes, we only stack the multicoverage data in the ground-roll areas. Searching the CS gathers before the CO section is another modification of the conventional COCRS stacking. We tested the proposed method using synthetic and real data sets from western Iran. The results of the ground-roll attenuation with the proposed method were compared with results of the f-k filtering and conventional COCRS stacking after f-k filtering. The results show that the proposed method attenuates the aliased and nonaliased ground roll better than the f-k filtering and conventional CRS stacking. However, the computation time was higher than other common methods such as f-k filtering.

New Exact Solutions to Dispersive Long-Wave Equations in （2＋1）-Dimensional Space

New exact solutions expressed by the Jacobi elliptic functions are obtained to the （2＋1）-dimensional dispersive long-wave equations by using the modified F-expansion method. In the limit case, new solitary wave solutions and triangular periodic wave solutions are obtained as well.

Application of a joint algorithm based on L-T to pulse pressure detection signal of fiber Fabry-Perot nano pressure sensor

An improved denoising method and its application in pulse beat signal denoising are studied.The proposed denoising algorithm takes the advantages of local mean decomposition(LMD)and time-frequency peak filtering(TFPF),called L-T algorithm.As a classical time-frequency filtering method,TFPF can effectively suppress random noise with signal amplitude retained when selecting a longer window length,while the signal amplitude will be seriously attenuated when selecting a shorter window length.In order to maintain effective signal amplitude and suppress random noise,LMD and TFPF are improved.Firstly,the original signal is decomposed into progression-free survival(PFS)by LMD,and then the standard error of mean(SEM)of each product function is calculated to classify many PFSs into useful component,mixed component and noise component.Secondly,by using the shorter window TFPF for useful component and the longer window TFPF for mixed component,noise component is removed and the final signal is obtained after reconstruction.Finally,the proposed algorithm is used for noise reduction of an Fabry-Perot(F-P)pressure sensor.Experimental results show that compared with traditional wavelet,L-T algorithm has better denoising effect on sampled data.

New Exact Solutions to Long-Short Wave Interaction Equations

New exact solutions expressed by the Jacobi elliptic functions are obtained to the long-short wave interaction equations by using the modified F-expansion method. In the limit case, solitary wave solutions and triangular periodic wave solutions are obtained as well.

脊髓型颈椎病病人经颅磁电刺激运动诱发电位的对比研究

目的探讨磁电刺激运动诱发电位（ＭＥＰ）在脊髓型颈椎病（ＣＳＭ）的应用价值，并对其临床相关性进行分析。方法采用经颅磁、电刺激对３０例脊髓型颈椎病病人以及年龄性别等相配匹的３０名健康成人分别于外展小指肌、肱二头肌及下肢展短肌表面进行ＭＥＰ的检测。结果全部病人的ＭＥＰ都出现异常，表现为潜伏期、中枢传导时间（ＣＭＣＴ）延长，时限增宽，波辐降低或不能引出。磁刺激ＭＥＰ的ＣＭＣＴ和皮层刺激潜伏期与脊髓型颈椎病临床日本整形外科协会（ＪＯＡ）评分间有密切相关性，能较好地反映ＣＳＭ病人的病情。结论ＭＥＰ在检测ＣＳＭ病人运动功能方面具有定量评价作用。与电刺激相比，磁刺激ＭＥＰ能更好地反映ＣＳＭ病人的病情。

New Exact Solutions and Dynamics in(3+1)-Dimensional Gross–Pitaevskii Equation with Repulsive Harmonic Potential

Using an improved homogeneous balance principle and an F-expansion technique, we construct the new exact periodic traveling wave solutions to the(3+1)-dimensional Gross–Pitaevskii equation with repulsive harmonic potential. In the limit cases, the solitary wave solutions are obtained as well. We also investigate the dynamical evolution of the solitons with a time-dependent complicated potential.

A millimeter-wave WDM-ROF system based on supercon- tinuum technique

In this paper, a new millimeter-wave （mm-wave） wavelength division multiplexing （WDM） system based on radio-over- fiber （ROF） technology is proposed. In this approach a multi-wavelength light source is obtained by supercontinuum （SC） technique, and mm-wave signals are obtained by using optical heterodyning method. We experimentally demonstrate the generation of optical carriers for 6-WDM channels, obtain 40 GHz ram-wave signals by employing optical heterodyne technique, and successfully achieve low error rate transmission of 2.5 Gbit/s in WDM channels over a distance of 25 km in a G.652 fiber. The experimental results verify that the proposed solution is feasible and cost effective.