对电梯新检规今后修订的几点建议

2009年国家质检总局颁布了TSGT7001-2009《电梯监督检验和定期检验规则——曳引与强制驱动电梯》,随着消防员电梯、防爆电梯、液压电梯、自动扶梯与自动人行道、杂物电梯新版验规的出台,目前除仅载货电梯和家用电梯等新制定标准且不在《特种设备目录》中的新梯种还没有对应检规外,电梯类监督检验和定期检验规则已经初步到位。随着这些新版检规的执行,     

基于无线可见光通信的双向语音对讲系统

设计并实现了基于无线可见光通信(VLC)的双向语 音对讲系统。上下行链路均使用普通的1W发光二极管(LED)手电筒作为发射端光源, 同时实现语音传输和照明功能。系统采用开关键控-非归零码(OOK-NRZ)调制方式,在测 试LED的光电特性后,设计了LED 驱动电路和接收电路;使用单片机控制音频编解码芯片实现语音信号的采集、处理和传输, 通过异步收发传输接口(UART) 进行数据传输,实现了最远通信距离为40m、最高传输速率为2.5Mbit/s的全双工实时语音 对讲。本文系统实现复杂度低、成 本低和功耗小,并可应用于其他数据传输场合,具有良好的实用性和广泛的适用性。     

Inversion techniques to obtain local rotation velocity and ion temperature profiles for the x-ray crystal spectrometer on EAST

Inversion techniques are conducted based on the tangential x-ray crystal spectroscopy(TXCS)geometry on EAST to obtain the local profiles of ion temperature(T_i) and toroidal rotation velocity(vt). Firstly, local emissivity profiles of the impurity argon are obtained using the asymmetrical Abel inversion.Then, the local vtand T_i profiles are calculated by considering the local emissivity profiles and the TXCS detailed geometry. In addition, how the changes in the v_t     

创鲁班精品工程 树企业社会形象

通过对创"鲁班奖"工程的策划、实施,精心准备"鲁班奖"的复查,获得高度评价,提升企业形象。     

基于锁模脉冲源和高速光开关的时分抽样模数转换

提出了一种基于锁模脉冲源和高速光开关的时分抽样模数(A/D)转换系统。使用高重复频率、窄脉宽的锁模脉冲串对射频信号进行抽样,利用高速光开关进行时分复用,将高采样率的信号转换为并行的多路低采样率信号,以适应现有的电模数转换器进行量化和编码,并且通过改变光开关的频率,可以灵活地改变解复用后每路信号的频率。系统的优点在于可扩展性高,只需一个锁模脉冲源。使用10 GHz重复频率的锁模脉冲和1.25 GHz的高速光开关验证了系统方案的可行性。利用实验中得到的采样点可以较好地恢复出时域信号,并且得到了各个频率的频谱图。其信噪比可达32.02 dB,等效于5.03 bit的有效比特数。     

EAST辐射偏滤器运行模式下等离子体杂质浓度评估方法

通过在偏滤器区域充入适量氖气（Ne）或氩气（Ar）,东方超环（Experimental Advanced Super-conducting Tokamak,EAST）托卡马克装置实现了辐射偏滤器运行模式。在辐射偏滤器运行模式下,靶板热负荷显著降低,有效缓解了高能粒子流对偏滤器靶板的损伤。但是在偏滤器区域充入过量杂质气体时,杂质粒子会沿着磁力线进入主等离子体,影响主等离子体的约束性能,甚至导致等离子体破裂。因此,有必要研究偏滤器区域等离子体杂质浓度的估算方法,分析充入杂质气体时该区域杂质的定量变化,以此来评估充入的杂质气体对芯部等离子体约束性能的影响。本文针对不同的杂质种类,建立了不同的杂质浓度估算方法。对于钨杂质,通过极紫外光谱（Extreme Ultraviolet Spectroscopy,EUV）诊断系统测量偏滤器区域钨杂质的辐射强度,再根据碰撞-辐射模型对该区域的钨杂质浓度进行了估算。对于Ne杂质,则通过等离子体有效电荷数(Z_eff)的变化进行了Ne杂质浓度估算。基于估算结果,对辐射偏滤器条件下的芯部杂质行为进行了讨论。上述杂质浓度评估方法对开展辐射偏滤器...     

Space-resolved vacuum-ultraviolet spectroscopy for measuring impurity emission from divertor region of EAST tokamak

The measurement of impurity distribution in the divertor region of tokamaks is key to studying edge impurity transport. Therefore, a space-resolved vacuum-ultraviolet (VUV) spectrometer is designed to measure impurity emission in the divertor region on EAST. For good spectral resolution, an eagle-type VUV spectrometer with 1 m long focal length with spherical holograph grating is used in the system. For light collection, a collimating mirror is installed between the EAST plasma and the VUV spectrometer to extend the observing range to cover the upper divertor region. Two types of detectors, i.e. a back-illuminated charge-coupled device detector and a photomultiplier-tube detector, are adopted for the spectral measurement and high-frequency intensity measurement for feedback control, respectively. The angle between the entrance and exit optical axis is fixed at 15°. The detector can be moved along the exit axis to maintain a good focusing position when the wavelength is scanned by rotating the grating. The profile of impurity emissions is projected through the space-resolved slit, which is set horizontally. The spectrometer is equipped with two gratings with 2400 grooves/mm and 2160 grooves/mm, respectively. The overall aberration of the system is reduced by accurate detector positioning. As a result, the total spectral broadening can be reduced to about 0.013 nm. The simulated performance of the system is found to satisfy the requirement of measurement of impurity emissions from the divertor area of the EAST tokamak.     

浅析《石瓢壶》的创作

历代陶艺家承前启后,名家辈出,创新的茶壶造型千变万化,层出不穷,有顺天地万物之自然形态而成者,有凭自己创思巧心而成者,蔚为大观。     

基于SOA的L波段多波长锁模光纤环形激光器

报道了一种基于半导体光放大器(SOA)的L波段多波长光纤环形激光器,采用自制的100GHz信道间隔的光纤Mach-Zehnder(M-Z)干涉仪作为梳状滤波器,电吸收调制器(EAM)实现主动锁模,在1593.6nm附近获得了11个波长的同步锁模脉冲序列,脉冲重复频率为10GHz,半高全宽约为24ps,不同波长间功率不平坦度小于1dB。激光器具有工作稳定、输出光谱较宽和不同波长间功率波动小的特性。     

21米跨双向预应力屋面梁施工

重庆建工学院学生食堂餐厅的层面肋型梁采用21米跨屋面双向预应力梁(WYSXL),顶面标高为+7.00米。屋面为学生活动场所。梁底不做吊顶和抹灰,只刷白,完工后人们可以直观它的结构造型。 WYSXL梁跨度为21.213米,长度力21.713米,分为X、Y两个方向,每个方间均为12根梁等距离排列组成。X向双边各二