10GPON技术发展浅析

近几年，不断增长的IPTV、视频游戏业务对带宽的巨大需求推动着宽带技术的发展，未来物联网的发展也离不开宽带网络的支撑。作为主流的光接人技术，EPON／GPON不能满足未来面对每户100M-1G的带宽需求，PON网络迈向10G的趋势不可逆转。     

NEXO PS10专业扬声器系统

本文介绍的Ｎｅｘｏ公司位于法国巴黎,是一家具有２０年悠久历史的专业扬声器制造厂商。这次介绍的ＰＳ１０系列是Ｎｅｘｏ扬声器家族中体积最小的,它包括一对ＰＳ１０扬声器、一只Ｌｓｕｂ５００超低音音箱与一部ＰＳ１０扩音机。首先介绍ＰＳ１０扬声器系统所采用的特...     

10GBASE-X物理层并行光传输研究

研究了符合IEEE802.3ae标准的万兆以太网10GBASE-X物理层技术,建立了万兆以太网10GBASE-X物理层点到点并行光传输系统.该系统由10GE连接单元接口(XAUI)与10Gb介质无关接口(XGMII)转换芯片、4×3.125Gbit/s 850nm自制垂直腔面发射激光器(VCSEL)并行光发射模块与并行光接收模块构成.利用现场可编程门阵列(FPGA)实现了10GBASE-X物理层编解码子层(PCS)、物理介质连接子层(PMA)的全部功能,光互联采用2m并行12芯400MHz·km 62.5μm多模带状光纤.经逻辑分析仪(Agilent 1682A)在接收端低速IO引脚测试,在接收端恢复出发端的万兆以太网帧结构数据,逻辑功能正确.     

富士V10数码相机

最近，试用了富士V10数码相机（机器编号：62W00865），感觉颇具个性，有不少亮点称道，现与影友交流如下。     

尼康FM10照相机

1977年尼康（Nikon）研制成功了第一架纵走式金属快门手动曝光单镜头反光相机，型号为FM。虽然是首创，但其技术性能却完备无缺，比如测光系统用＜lPS（砷化镓）作测光元件，测光方式为典型的中心重点测光（SPOT），测光范围为EVI至EV18（ISO100，f／1．4）；取是范围为93％，放大率为0．86倍（50mmf／1．4镜头）；快门速度为1秒到1／1000秒，及B档，X闪光同步上限为1／125秒；胶片感光速度为ISO12至ISO3200；另外，机身设有快门锁、外接快门线插孔、热靴、外接闪灯PC插孔、机械自拍器、景深预测、多重曝光…·等装置；作为一架…     

10MnNiCrMoV钢低温冲击韧性的研究

10MnNiCrMoV是新一代造船材料,本文通过对该钢种的低温冲击韧性进行系统研究发现,10MnNiCrMoV钢具有良好的抗脆性破坏能力,可作为无限海区的舰船船体材料。确定了冲击能VET与能量转变温度VTrE和试验温度的关系模型VET/VEo=9+95/{1+exp[-0.05×(T-VTrE-2.5)]},通过该模型可确定舰船在不同的最低使用温度下,10MnNiCrMoV钢的-40℃最低冲击功。     

尼康FM10、FE10——为中国业余摄影者“度身定制”的实用型单反相机

康ＦＭ２型相机于１９８２年问世 ,不久便进入了中国市场。１８年来 ,３５ｍｍ单镜头反光照相机的自动化浪潮一浪高过一浪 ,特别是１９８５年３５ｍｍ单镜头反光照相机实现自动对焦功能以来 ,３５ｍｍ单反相机的更新换代步伐更趋加快 ,但是 ,在自动功能方面远胜过ＦＭ２的单反机登场不多时便被挤出市场的情况也不鲜见。而ＦＭ２呢？真可谓是“长盛不衰”！这款相机自２０世纪８０年代中期进入中国市场后 ,很快受到中国摄影者的青睐。在摄影者中间 ,对这款相机好评如潮。即使到了２０世纪末期 ,自动对焦技术达到了极高的水平 ,自动对焦单镜头…     

浅论10KV供电系统的继电保护

在供电系统的继电保护上,电气设备与电气线路紧密结合在一起,由于受到地域条件、运行环境以及各种人为因素的影响,就会发生各种电气故障,针对电力系统中的发电、配电、变电、输电等方面的探讨,10Kv不接地系统中的某处发生一相接地时,就会造成接地相的电压降低,其他两相的电压升高,常此运行就可能使系统中的绝缘遭受损坏,因此,全面加强10kv供电系统的继电保护具有深厚的实际意义。本文旨在进一步分析10kv供电系统继电保护的重要性,并分析10Kv系统中应配置的继电保护的整体应用,阐述当前10Kv系统中继电保护的配置现状,更好的提升10kv供电系统的整体效能。     

Petri Net modelling approach for analysing the behaviour of Wnt/ β ‐catenin and Wnt/ Ca2+ signalling pathways in arrhythmogenic right ventricular cardiomyopathy

Arrhythmogenic right ventricular cardiomyopathy (ARVC) is an inherited heart muscle disease that may result in arrhythmia, heart failure and sudden death. The hallmark pathological findings are progressive myocyte loss and fibro fatty replacement, with a predilection for the right ventricle. This study focuses on the adipose tissue formation in cardiomyocyte by considering the signal transduction pathways including Wnt/ β ‐catenin and Wnt/Ca²⁺ regulation system. These pathways are modelled and analysed using stochastic petri nets (SPN) in order to increase our comprehension of ARVC and in turn its treatment regimen. The Wnt/ β ‐catenin model predicts that the dysregulation or absence of Wnt signalling, inhibition of dishevelled and elevation of glycogen synthase kinase 3 along with casein kinase I are key cytotoxic events resulting in apoptosis. Moreover, the Wnt/Ca²⁺ SPN model demonstrates that the Bcl2 gene inhibited by c‐Jun N‐terminal kinase protein in the event of endoplasmic reticulum stress due to action potential and increased amount of intracellular Ca²⁺ which recovers the Ca²⁺ homeostasis by phospholipase C, this event positively regulates the Bcl2 to suppress the mitochondrial apoptosis which causes ARVC.Inspec keywords: molecular biophysics, enzymes, cancer, muscle, Petri nets, cellular biophysics, bioelectric potentials, biomembranes, tumours, cardiology, genetics, biochemistry, calciumOther keywords: heart failure, sudden death, hallmark pathological findings, progressive myocyte loss, fibro fatty replacement, adipose tissue formation, signal transduction pathways, Ca²⁺ regulation system, stochastic petri nets, ARVC, $β‐catenin model, Wnt signalling, glycogen synthase kinase 3, Bcl2 gene, c‐Jun N‐terminal kinase protein, petri Net modelling approach, Ca²⁺ signalling pathways, arrhythmogenic right ventricular cardiomyopathy, inherited heart muscle disease, Ca²⁺ SPN model, Ca     

The 10 KM/S, 10 KG railgun

The system design for a railgun powered by capacitor-based energy stores distributed along its length is presented. It is assumed that it is required to accelerate a mass of 10 kg to a velocity of 10 km/s. Parameters for the railgun and its energy stores are derived, and the performance of the system is computed with particular attention being paid to the efficiency with which store energy is converted to launch-package kinetic energy. It is shown that efficiencies of 90% can be expected from a properly designed system     

Ni—20Cr—10Mo—10Co高温合金的相分析

Ni-20Cr-10Mo-10Co高温合金是以碳化物为主要强化相的一种铸造高温合金,用X射线衍射与扫描电镜的背散射象及能谱分析确定了该合金的相组成,即基体为Ni-Mo-Cr-Co的固溶体,及（Cr,Mo,Co,Ni)(23C6和（Mo,Cr,Co,Ni)6C两种碳化物。     

10-kY 10-mA DC Supply with 0.1-ppm Stability

A 10-kV stabilized supply with a dc capacity of 10 mA has been constructed. Its drift rate measured over time intervals greater than about 1 minute and extending to times of more than 10 hours is about 1 part in 107 per hour. For shorter times from 1 second to 1 minute the peak-to-peak deviation from the mean is about 2 mV at 9.2 kV or ±1 part in 107. This performance has been achieved by the use of an initially well regulated commercial 10-kV supply in a closed-loop control system. High dc loop gain has been achieved by the use of a chopper-stabilized amplifier, and a guarded resistive divider of special design. The reference voltage is made up of a bank of unsaturated standard cells enclosed in a temperature-controlled air bath whose short term temperature stability is ±0.001°C. The control resistive divider, together with a measuring divider and a guard divider, are enclosed in an oil bath whose temperature is controlled near ambient to within ±0.01°C.     

AlN(10-10)表面结构的第一性原理计算

采用基于密度泛函理论的第一性原理方法,计算了六方AlN及其(10-10)表面的原子及电子结构.其中计算出的六方AlN晶体中的晶格常数和体弹性模量与实验值很符合.用平板超原胞模型模拟计算AlN(10-10)表面的原子及电子结构,结果表明:AlN(10-10)表面弛豫后,表面顶层原子之间的键长收缩并发生扭转.表面原子均向体内移动,原子轨道重新杂化,N原子趋向于p3构型,Al原子趋向于sp2构型.     

Effect of cooling on fatigue strength of metastable austenitic 30Kh10G10 [30Cr10Mn10] steel in relation to specimen length

This investigation was concerned with the kinetics of phase transformations in metastable austenitic 30Kh10G10 steel specimens fatigued in rotating bending and with the effect of specimen temperature on the fatigue strength of this steel in relation to the specimen length. It was shown that spray cooling produces substantial changes in the kinetics of phase transformations, increases the fatigue strength of the steel in question and substantially inhibits the manifestation of the size factor.     

10×10InGaAsP/InP阵列波导光栅器件的研制

研制了脊形波导结构的10×10InGaAsP/InP阵列波导光栅器件(AWG),并采用掺铒光纤放大器(EDFA)作宽带光源测量了AWG的近场图以及分光特性。