A股市场长记忆性特征研究

本文采集了我国A股市场所有上市公司的价格数据和收益率数据,分别采用r/S、Mr/S和V/S检验方法进行实证研究,发现:1数据平稳性特征会对长记忆性检验结果造成直接影响,而股票价格和收益率数据不都是平稳的,因此,应该事先对数据进行平稳性检验;2不同股票样本、不同检验方法得到的检验结果有较大差异,根据市场指数或部分股票样本探究股市长记忆性有一定的片面性;3同一时间段,数据采样间隔(日、周)会影响到数据总量,进而造成长记忆性检验结果的差异。对A股市场的股票总体分析表明,无法给出市场长记忆特征的最终结论。因此,相对股市整体而言,探究个股长记忆性特征更具有研究价值。教育部人文社科青年项目“海量金融时间序列数据平稳性检验方法研究”(编号:13YJCZH044); 湖南省科研创新立项课题“大数据时代金融时间序列长记忆性检验方法研究”(编号:CX2014B397

金融类企业ERM水平对企业价值的影响

企业全面风险管理ErM目前在世界上逐渐被广泛接受和认可,但如何构造量化ErM的指标目前尚未形成统一的标准。文章从战略、经营、合规、报告、财务和社会责任6个目标层采集了ErM指标的数据,在此基础上构建了三个ErM指数,并分别研究其对企业价值的影响。研究发现:1ErM指数与企业价值之间是一种对数关联性,而非简单的线性关系,特别是包含社会责任目标的ErM3指数与企业价值之间是一种负相关的对数关系,与以往研究呈现出不同的特点。2金融企业设立专门从事风险管理的职位CrO能有效管理企业内外部风险,有助于提升企业价值。教育部人文社科青年项目“海量金融时间序列数据平稳性检验方法研究”(项目编号:13YJCZH044); 湖南省科研创新立项课题“大数据时代金融时间序列长记忆性检验方法研究”(项目编号:CX2014B397

Principle demonstration of the phase locking based on the electro-optic modulator for Taiji space gravitational wave detection pathfinder mission

Weak-light phase locking is a key technology for Taiji space gravitational wave detection and its pathfinder mission. Previously, the phase locking was achieved by a complicated technique, which controls the frequency of the laser via a piezo-electric actuator (kHz range or more) and a temperature actuator (sub-Hz range). We propose an easy phase-locking strategy, which is based on the electro-optic modulator (EOM). Compared with the traditional way, this strategy only needs to modulate the driven voltage of the EOM, and the frequency bandwidth can cover all ranges. An experiment is also established to prove the feasibility of the method. The results show that the noises are &lt;80 mu rad/Hz(1/2) in frequencies from 0.2 to 1 Hz, and the thermal drift is the main noise source in our recent system. (C) 2018 Society of Photo-Optical Instrumentation Engineers (SPIE)</p

Glacial meltwater and sea ice meltwater in the Prydz Bay, Antarctica

Measurements of d D and salinity were carried out in the Prydz Bay during two Antarctic cruises, the 13th and the 14th Chinese National Antarctic Research expeditions (CHINARE). Mass balance calculations based on d D and salinity showed that during the 13th CHINARE cruise, per- centages of glacial meltwater and sea ice meltwater in the study region ranged from 0% to 3.82% and from 3.19% to 4.78%, respectively. Meanwhile, the percentages were 1.53%—3.98% and 3.80%—4.52% during the 14th CHINARE cruise. We dep..

a Step Forward

东部沿海欠发达地区加快工业化进程,必须对自身发展的制约因素有个清醒的把握,才能趋利避害,顺利推进。本文以新世纪国内国际发展的新形势为背景,从一般性和特殊性两个方面入手,深入分析东部沿海欠发达地区发展工业、加快工业化进程面临的各种制约因素。In order to speed the industrialization smoothly in under-developed regions in the east coast, we must keep sober-minded to the restricted factors. This essay aims to analyze all kinds of the factors from the universal to particular that we will face when speeding the industrialization and it tries to get a result based on the background of the new situation both in international and domestic development

一种星间激光干涉测距设备

本发明实施例涉及一种星间激光干涉测距设备，包括：第一航天器(10)和第二航天器(20)；所述第一航天器(10)和所述第二航天器(20)构成两个独立的环形光路，所述第一航天器(10)与所述第二航天器(20)的所构成光路回路路径相同，且方向相反，能够消除激光频率不稳定所带来的测距噪声。利用两个回路的测量信号将激光频率噪声完全消除，从而可大大提高测量信号的信噪比，进而提高测距的精准度

The Development of Phasemeter for Taiji Space Gravitational Wave Detection

Taiji space gravitational wave detection utilizes the laser interferometer to convert the tiny distance change into the phase fluctuation of the beat note. As to realize the sensitivity of 1 pm/ Hz, the phasemeter needs to calculate the phase with the precision of 2 rad/ Hz in the frequency range of 0.1 mHz and 1 Hz. In this paper, we report recent progress of the phasemeter for Taiji. Noises which possibly affect the measurement sensitivity are tested and discussed, especially the sampling noise and the frequency jitter. Finally, the accuracy of the phasemeter is calibrated. The result shows that the sensitivity has reached the requirement of Taiji in the frequencies between 0.01 Hz and 1 Hz, 0.1 mHz-1 mHz. Noises in the range of 1 mHz and 0.01 Hz, which have not yet depressed well, are dominated by the clocking jitter and the thermal fluctuation

The recent development of interferometer prototype for Chinese gravitational wave detection pathfinder mission

A brief progress report is presented on the interferometer prototype of the Chinese gravitational wave detection pathfinder mission. After careful consideration of the temperature fluctuation induced noise and the electronic noise, the noise spectra density of the interferometer prototype reached 100 pm/root Hz at 1 mHz and achieved 15 pm/root Hz in high frequency region. However, in some frequency range from 3 mHz to 30 mHz, further improvement is still needed. Possible improvement is also discussed. (C) 2018 Elsevier Ltd. All rights reserved

A low-noise analog frontend design for the Taiji phasemeter prototype

The Taiji program plans to utilize the laser interferometer to measure the movement at the picometer level between free-floating test masses. As the phase readout equipment, the phasemeter needs to obtain the beat note with an accuracy of mu rad root Hz. The main source of noise in the phasemeter is the analog frontend of the analog to digital converter. A self-designed phasemeter prototype with a low-noise analog frontend, which includes the theme of the pilot tone correction, has been developed and tested for the Taiji program in this Note. The experimental results show that the performance of the developed phasemeter can satisfy the Taiji sensitivity requirement in the whole frequency range. The sensitivity of the board can reach 0.5 mu rad root Hz in the frequency range of 0.1-1 Hz. Therefore, the prototype gives us a good model for the fully functional Taiji phasemeter