支撑喉镜下半导体激光治疗声带疾病

为了探讨支撑喉镜下半导体激光治疗声带疾病的实用价值,采用这种方法治疗了100例声带息肉和声带小节患者,效果良好,该手术具有操作简便易行,病人痛苦小的优点。     

脉冲氙灯瞬态放电特性实时检测

随着惯性约束核聚变（ICF）的发展,对激光驱动器提出了很高的要求。本文研究了脉冲氙灯瞬态在线检测系统对脉冲氙灯放电电压、电流和发光强度进行实时监测的方法和系统的结构,结合氙灯的瞬态放电特征,利用光电隔离、光纤传输、高速A／D采样等技术,获取氙灯瞬态放电 数据。有效的实现了弱电系统对强电系统的远程测控,为大型激光驱动器能源系统的自动测控打下良好的基础。     

Symbolic derivation and numeric computation of dyadic Green'sfunctions using Mathematica

This paper presents a mathematical-software functional package that is capable of performing symbolic derivation and numeric computation of dyadic Green's functions for certain multilayered structures: a planar stratified multilayered medium, a spherical multilayered medium, a cylindrical multilayered medium, and a conducting rectangular waveguide with a multilayered dielectric load. The algorithms of this software package are based on the eigenfunction-expansion method. Using Mathematica^TM, two packages were written to fulfill the aforementioned objectives. Upon completion of the software development, dyadic Green's functions for three-layered media were generated. A comparison of these outputs with published results showed good agreement. This demonstrated the applicability of the symbolic package. For the numeric package, the Green's dyadics for a particular three-layered spherical isotropic multilayered medium were generated as an illustration. These packages have been successfully implemented, and future derivation of dyadic Green's functions for these media may be performed     

Decoupled multiuser code-timing estimation for code-divisionmultiple-access communication systems

We present herein a decoupled multiuser acquisition (DEMA) algorithm for code-timing estimation in asynchronous code-division multiple-access (CDMA) communication systems. The DEMA estimator is an asymptotic (for large data samples) maximum-likelihood method that models the channel parameters as deterministic unknowns. By evoking the mild assumption that the transmitted data bits for all users are independently and identically distributed, we show that the multiuser timing estimation problem that usually requires a search over a multidimensional parameter space decouples into a set of noniterative one-dimensional problems. Hence, the proposed algorithm is computationally efficient. DEMA has the desired property that, in the absence of noise, it obtains the exact parameter estimates even with a finite number of data samples which can be heavily correlated. Another important feature of DEMA is that it exploits the structure of the receiver vectors and, therefore, is near-far resistant. Numerical examples are included to demonstrate and compare the performances of DEMA and a few other standard code-timing estimators     

QoS support for an all IP system beyond 3G

Mobile radio systems beyond the third generation will evolve into all-IP systems, integrating Internet and mobile system advantages. The BRAIN project is developing a system architecture which combines local coverage broadband radio access systems based on HIPERLAN/2 with several wider-coverage mobile radio systems, enabling full coverage of seamless IP-based services for users in hot spot areas and on the move. End-to-end QoS provision is one of the major challenges in the design of such a system and must be supported by the application, network, and wireless access layers. This article proposes a QoS system architecture, including the terminal architecture, the IP-based access network, and the main characteristics of the enhancements to the air interface based on HIPERLAN/2 focusing on its wireless QoS support     

High-saturation high-speed traveling-wave InGaAsP-InPelectroabsorption modulator

High-saturation power traveling-wave electroabsorption modulators (TW-EAMs) with modulation bandwidth greater than 40 GHz have been demonstrated. Microwave properties of the TW-EAM waveguide are extracted from the measured S-parameters using an equivalent circuit model. Excellent agreement is obtained between the predicted and the measured frequency responses     

Jitter-based delay-boundary prediction of wide-area networks

The delay-boundary prediction algorithms currently implemented by transport protocols are lowpass filters based on autoregressive and moving average (ARMA) models. However, previous studies have revealed a fractal-like structure of delay sequences, which may not be well suited to ARMA models. We propose a novel delay-boundary prediction algorithm based on a deviation-lag function (DLF) to characterize the end-to-end delay variations. Compared to conventional algorithms derived from ARMA models, the new algorithm can adapt to delay variations more rapidly and share the delay's robust high-order statistical information (jitter deviation) among competing connections along a common network path. Preliminary experiments show that it outperforms Jacobson's (1988) algorithm, which is based on an ARMA model, by significantly reducing the prediction error rate. To show the practical feasibility of the DLF algorithm, we also propose a skeleton implementation model     

The application of evolutionary algorithm in determining T wave-end

There have been several methods for determining T wave-end. But none of them can overcome the difficulty from multiformity of ECG signal pattern. In this paper, a method for determining T wave-end using evolutionary algorithm (EA) is proposed. In this way, first, every characteristic parameter related to T wave-end is encoded to a string of codes, and adaptation function is constructed with the string of codes. Then choose the individual according to the adaptation function value and do genetic operation (reproduction, crossover and mutation), so as to produce offspring with more adaptation function value. Because of EA's autoadaptation and autoorganization character, it can trace ECG signal type and find the T wave-end automatically. Experiment results show that the error ratio of recognizing T wave-en'd using this method is much smaller than that using existing method.     

Geometric and Electronic Structure-Matched Superoxide Dismutase-Like and Catalase-Like Sequential Single-Atom Nanozymes for Osteoarthritis Recession

Highly-active single-atom nanoenzymes (SAzymes) with biomimetic geometric and electronic coordination structures are highly highlighted to exhibit greatly-increased catalysis activity. Despite various SAzymes, superoxide dismutase (SOD)-like SAzymes for scavenging superoxide anions to treat osteoarthritis are still absent. In this report, a graphene-supported Cl Cu N₄-centered SAzyme (Cu N₄ClG) is engineered that carries out SOD-like reactions. Various synchrotron radiation-based X-ray valence/structural analyses reveal that the geometric and electronic structures of such Cl Cu N₄ active centers are validated to atomically match natural SOD enzyme after precisely manipulating coordinated N and Cl atoms via the unprecedented pre-coordination orientation and preservation of copper-phthalocyanine structure. Cu-N₄ClG SAzymes are endowed with unparalleled catalytic activities and kinetics to degrade O₂^•¯ into H₂O₂ and O₂, and further exhibit catalase (CAT)-like activity to sequentially decompose H₂O₂ and ^•OH into H₂O and O₂, wherein the origin of sequential SOD-like and CAT-like catalysis routes is uncovered. Impressively, nitroxide radical scavenging and photothermally-enhanced catalytic activity are reached, synergistically protecting chondrocytes from oxidative stress-induced apoptosis and alleviating osteoarthritis via re-programming or normalizing osteoarthritis microenvironments. Cu-N₄ClG SAzymes are competent for other reactive oxygen species (ROS)-arised lesions, and their rationales provide guidance to design other SAzymes.     

A Stable Polymer-based Solid-State Lithium Metal Battery and its Interfacial Characteristics Revealed by Cryogenic Transmission Electron Microscopy

Solid-state lithium metal batteries (SSLMBs) are a promising candidate for next-generation energy storage systems due to their intrinsic safety and high energy density. However, they still suffer from poor interfacial stability, which can incur high interfacial resistance and insufficient cycle lifespan. Herein, a novel poly(vinylidene fluoride‑hexafuoropropylene)-based polymer electrolyte (PPE) with LiBF₄ and propylene carbonate plasticizer is developed, which has a high room-temperature ionic conductivity up to 1.15 × 10⁻³ S cm⁻¹ and excellent interfacial stability. Benefitting from the stable interphase, the PPE-based symmetric cell can operate for over 1000 h. By virtue of cryogenic transmission electron microscopy (Cryo-TEM) characterization, the high interfacial compatibility between Li metal anode and PPE is revealed. The solid electrolyte interphase is made up of an amorphous outer layer that can keep intimate contact with PPE and an inner Li₂O-dominated layer that can protect Li from continuous side reactions during battery cycling. A LiF-rich transition layer is also discovered in the region of PPE close to Li metal anode. The feasibility of investigating interphases in polymer-based solid-state batteries via Cryo-TEM techniques is demonstrated, which can be widely employed in future to rationalize the correlation between solid-state electrolytes and battery performance from ultrafine interfacial structures.