一种有效的适合F-J方法从背景噪声资料中提取多阶频散曲线的台阵划分方法

近年发展起来的从地震背景噪声提取多阶频散曲线的F-J方法是一种台阵分析方法,对某一特定的研究区域内台阵的划分方式直接影响成像的效果.当研究区域地下结构较简单,且台站间距比较均匀时,可以使用简单的平移式移动阵列法;然而若研究区域地下结构复杂多变,尤其是台站间距疏密不均时,就需要根据具体的地域特征灵活划分台阵.本文介绍了一种适用于地下结构复杂及台站间距不均匀区域的台阵划分方法,具有一定的普适性.我们将其应用于美国阿拉斯加及加拿大西北部,验证了相比于简单的沿经纬度移动阵列,我们的分区方法确实大大提高了结果的分辨率,为后续反演研究区域三维速度结构提供了坚实的保障.

探讨F波联合SSR和NCV在糖尿病周围神经病早期的诊断价值

目的探讨F波联合皮肤交感反应(SSR)和常规神经传导检测(NCV)对糖尿病周围神经病(DPN)早期的诊断价值。方法对324例2型糖尿病患者,根据有无周围神经症状分为无症状组(103例)、有症状组(221例)及同期对照组(100例),均行正中神经和胫神经F波,四肢感觉、运动神经传导检测(NCV)和SSR检查。分析比较组间F波、NCV和SSR指标的临床特点。结果糖尿病患者下肢运动、感觉神经损害程度重于上肢,且四肢感觉神经异常比例高于运动神经(P<0.05);对糖尿病有症状组、无症状组进行SSR和NCV联合检测,总异常率为90.1%,明显高于单独应用NCV异常率,差异有统计学意义(P<0.05)。与对照组比较,糖尿病(DM)有症状组上肢正中神经F波出现率减少,F波传导速度减慢,下肢胫神经F波出现率减少,F波潜伏期延长。无症状组仅上肢正中神经F波出现率减少。与DM无症状组比较,有症状组上肢正中神经F波传导速度减慢,下肢F波出现率减少,F波潜伏期延长(P<0.05),而上肢F波出现率差异无统计学意义(P>0.05)。对糖尿病组进行NCV、SSR和F波联合检测异常率为93.2%,明显高于单纯NCV检测(P<0.05)。结论糖尿病在早期无症状时即存在周围神经损害,以小纤维受累为主,F波、SSR联合NCV检测能有效弥补NCV不能反映自主神经小纤维和运动神经近端功能的不足,提高对DPN的早期诊断。

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/tripletSC) structures are studied by taking into account the roughness interfacial barrier and exchange splitting in the FM.For the triplet-SC of Sr2RuO4, we consider two-dimensional f-wave order parameter symmetries having nodes within the RuO2 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.

应用于5G通信的三频F类功率放大器设计

为满足5G通信技术的多标准和多频段需求,针对如何提高多频段效率的问题,提出了一种三次谐波控制的三频功率放大器设计方法。首先基于F类功率放大器的原理设计了三频谐波控制网络,用于提高三频功率放大器效率;然后又给出了一种三频基波匹配方法,用来实现任意三频的基波匹配并简化输出匹配结构;最后设计了一款高效率的三频F类功率放大器并进行测试,测试结果表明该功率放大器在1.8、2.6和3.4 GHz的漏级效率分别为74.2%、73.8%和69.0%,饱和输出功率均在40 dBm左右,增益也可达到14.5 dB。

Josephson Current in f-Wave Superconductor/f-Wave Superconductor Junctions

We study the temperature T and the phase of the Josephson critical current I(φ)by taking into account theroughness scattering effect at inerface in an f-wave superconductor(S)/Insulator layer(I)/f-wave superconductor(S)junction.It is found that the Josephson critical currents in f-wave S/f-wave S,the barrier strength and the roughnessstrength at inerface always suppress the Andreev reflection.When α=β,the phase dependence of the Josephson currentI(φ)between two f-wave S is predicted to be simφ;particularly,when α≠β,the phase dependence of the Josephsoncurrent I(φ)between two f-wave superconductors is not predicted to be sin φ and with the barrier strength increasing,the period of the I((φ)turns decrease.

Extended F-Expansion Method and Periodic Wave Solutions for Klein-Gordon-SchrSdinger Equations

我们在场为在数学物理发现非线性的进化方程的周期的波浪答案的一个扩大 F 扩大方法。由使用扩大 F 扩大方法，各种各样的 Jacobi 椭圆形的功能为 theKlein-Gordon-Schroedinger 方程表示的许多周期的波浪答案被获得。在限制盒子中，方程的独居的波浪解决方案和三角法的函数解决方案也被获得。

Needle Electromyography, F-Wave, and H-Reflex: A Critical Reappraisal of Their Utility in the Diagnosis of Various Sensory Symptoms in the Extremities and Spine in the Setting of Normal Neurological Examination

Objective: Health care providers refer their patients to electromyography (EMG) laboratories for the evaluation of various sensory symptoms in the extremities and spine. The procedure is usually performed in conjunction with transcutaneous electrical stimulation of peripheral nerves and elicitation of the F-wave and H-reflex. The present study aimed to determine the real value of these procedures in the diagnosis of sensory symptoms in the setting of a normal neurologic examination. Method: The EMG reports and clinical histories of 100 patients, including 10 patients evaluated by other electromyographers, were reviewed. The study was focused on those with normal neurological examinations and those without histories of ongoing medical disorders and major surgeries to the extremities and spine. Results: All EMGs, F-wave, and H-reflex reports reviewed were normal, including those obtained from the second procedure performed in some patients and of those who subsequently underwent spinal surgery. Neurologic examination in all patients was normal. Conclusion: Needle EMG, F-wave and H-Reflex examinations are predictably normal in patients with non-dermatomal, non-neuropathic sensory symptoms with normal neurologic examination and without history of preexisting medical and surgical disorders. A good neurologic examination should determine the need to perform these procedures. Our findings have important diagnostic, therapeutic, prognostic, economic and legal implications.

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 0, the hyperbolic function solutions (including the solitary wave solutions) and trigonometric solutions are also given respectively.

Periodic Wave Solutions for Konopelchenko-Dubrovsky Equation

By using F-expansion method proposed recently, we derive the periodic wave solution expressed by Jacobi elliptic functions for Konopelchenko-Dubrovsky equation. In the limit case, the solitary wave solution and other type of the traveling wave solutions are derived.

THE WAVELET TRANSFORM BASED PROCESSING MEANS FOR 1/f NOISE IN MILLIMETER WAVE FOCAL PLANE ARRAY

After briefly introducing the characteristics of 1/f noise in millimeter wave focalplane array detectors, the paper analyses the relation of wavelet transform and 1/f noise in detail, suggests the fashion of decorrelating 1/f noise using the wavelet transform and deduces the relative expressions. The results of computer simulation show good effectiveness.

利用通用F-展开法求解ZK-BBM方程

利用通用F-展开法对ZK-BBM方程进行求解,作行波变换,将偏微分方程转化为常微分方程.假设方程具有洛朗级数形式的解,其中φ满足一般椭圆方程.通过齐次平衡法,确定参数n.通过比较同次幂项的系数,将非线性方程的求解问题转化为代数方程组求解.运用扩展的椭圆方程方法,求解ZK-BBM方程的孤子解、三角函数解、有理解和Jacobi椭圆函数解.

Some New Nonlinear Wave Solutions for a Higher-Dimensional Shallow Water Wave Equation

In this manuscript, we first perform a complete Lie symmetry classification for a higher-dimensional shallow water wave equation and then construct the corresponding reduced equations with the obtained Lie symmetries. Moreover, with the extended F-expansion method, we obtain several new nonlinear wave solutions involving differentiable arbitrary functions, expressed by Jacobi elliptic function, Weierstrass elliptic function, hyperbolic function and trigonometric function.

基于F⁃J法微动探测的表层结构调查

三维地震勘探常常处于城镇、道路等无法实施微测井等静校正方法的区域,近期人们尝试利用微动调查替代现有的静校正方法,取得了一定效果。现今微动调查在石油勘探的应用中主要通过提取面波频散曲线反演地层速度结构。该方法在石油勘探领域仍处于起步阶段,作为核心技术的频散成像方法种类繁多,其中2019年提出的频率—贝塞尔变换法(Frequency‑Bessel,F‑J)受到人们的广泛关注。相比空间自相关方法(SPAC),F‑J方法在利用背景噪声高阶模式面波成像上具有巨大优势。为了更好地研究F‑J方法的适用性,首先利用合成数据分析了不同观测系统和采集参数对F‑J成像的影响;然后利用四川某地实际噪声数据分析了不同观测系统、采集时间对F‑J频散成像的影响。实际应用中采用分段择优叠加得到的频散谱,可有效提高频散谱成像质量,为准确提取频散曲线提供了数据基础。进一步对比测井数据,发现利用基阶、高阶模式频散曲线进行多模式联合反演可精确地反演地层结构,使经济、高效地获得表层结构成为可能。

神经传导、F波及皮肤交感反应联合检测对糖尿病周围神经病变早期诊断的价值

目的采用受试者工作特征曲线(ROC)探讨神经传导检测(NCS)、F波及皮肤交感反应(SSR)联合检测对早期糖尿病周围神经病变的诊断价值。方法对78例糖尿病周围神经病(diabetic peripheral neuropathy,DPN)患者(观察组)和81例单纯糖尿病患者(对照组)进行常规神经传导检测及正中神经和胫后神经F波检测和SSR检测,对单独检测和联合检测的异常率进行比较,并采用ROC曲线分析NCS、F波及SSR联合检测的诊断效能。结果观察组NCS检查总异常率为91.36%。观察组F波总异常率为80.25%。NCS、F波及SSR的联合检验灵敏度与特异度分别为89.41%、86.33%。观察组与对照组相比,患者双侧胫后神经、腓总神经远端动作潜伏期(DML)明显延长,复合肌肉动作电位(CMAP)波幅显著降低(均P<0.05)。观察组与对照组F波检测相比,正中神经、胫后神经Fimin及Fimean延长,F波出现率降低,Fchd增加(均P<0.05)。观察组,上、下肢皮肤交感反应(SSR)起始潜伏期较对照组明显延长(均P<0.05),SSR波幅较对照组明显下降(P<0.05)。结论NCS检测是诊断DPN患者的基本手段,将其与F波及SSR联用,是早期诊断糖尿病自主神经病变的敏感手段,能明显提高亚临床型DPN患者的早期检出率。

91例肌萎缩侧索硬化症的F波和神经传导研究

目的 探讨肌萎缩侧索硬化症(ALS)F波和神经传导改变的特点。方法 所有患者均采用常规方法测定感觉神经传导速度(SCV)、运动末端潜伏期(distal motor latency,DML)和F波,后者的测定包括潜伏期和/或传导速度及出现率。分析了DML和复合肌肉动作电位(compound muscle action potential,CMAP)波幅、F波出现率与肌力的关系。结果 在91例ALS患者中,仅有3例SCV异常;正中神经、尺神经及胫后神经DML延长者分别占16.7％、13.8％、7.1％,CMAP波幅下降者分别占50.0％、44.6％、28.6％;5.0％患者F波传导速度异常,48例患者F波出现率下降,其中19例出现率为0。肌力下降者DML、CMAP波幅及F波出现率改变明显。结论 ALS患者可出现DML延长和CMAP波幅降低,二者比较后者的改变更显著;F波传导速度相对正常而出现率下降明显;DML、CMAP波幅及F波出现率的异常与肌力明显相关(P均<0.01)。

脑卒中恢复期患者偏瘫上肢治疗后肌电F波变化

目的探究脑卒中恢复期患者偏瘫上肢在康复治疗过程中正中神经F波参数变化规律。方法选择脑卒中偏瘫患者30例,所有患者接受为期4周的常规康复治疗,分别于治疗前及治疗4周后对其上肢正中神经行F波参数检测,同时采用改良Ashworth量表评定患侧上肢的痉挛程度,采用上肢Fugl-Meyer量表评估偏瘫侧上肢运动功能。结果治疗前患侧上肢的F波波幅、出现率均低于健侧肢体和正常组,阈值高于健侧及正常组,差异有统计学意义(P<0.05)。治疗后患侧肢体F波波幅、出现率均较治疗前明显上升,阈值下降,差异有统计学意义(P<0.05)。改良Ashworth评分和F波波幅、出现率、阈值等参数有相关性(P<0.05)。结论改良Ashworth评分和F波参数存在相关性,两者可结合用于临床上肢功能障碍的评估。

面神经F波对周围性面神经炎的早期诊断意义

目的探讨面神经F波对于周围性面神经炎的早期诊断意义。方法应用肌电图诱发电位检查仪对53例早期(3d内)周围性面神经炎的患者分别检测健侧和患侧面神经F波。结果其中37例严重病变患者患侧面神经F波消失,健侧面神经F波存在。16例轻至中度病变患者患侧面神经F波存在,但患侧面神经F波的平均潜伏期、潜伏期最小值及潜伏期最大值和健侧相比明显延长,患侧F波出现率和健侧相比明显减少。所有53例患者的统计结果表明F波健侧与患侧的差异有高度统计学意义(P<0.0001),健侧明显高于患侧。结论面神经F波作为一种能准确评价面神经颅内段功能的简单、敏感的客观方法,为一种早期诊断周围性面神经瘫痪的客观指标,将在面神经疾病的早期诊断中发挥作用。