Observation results by the TAMA300 detector on gravitational wave bursts from stellar-core collapses

We present data-analysis schemes and results of observations with the TAMA300 gravitational-wave detector, targeting burst signals from stellar-core collapse events. In analyses for burst gravitational waves, the detection and fake-reduction schemes are different from well-investigated ones for a chirp-wave analysis, because precise waveform templates are not available. We used an excess-power filter for the extraction of gravitational-wave candidates, and developed two methods for the reduction of fake events caused by non-stationary noises of the detector. These analysis schemes were applied to real data from the TAMA300 interferometric gravitational wave detector. As a result, fake events were reduced by a factor of about 1000 in the best cases. The resultant event candidates were interpreted from an astronomical viewpoint. We set an upper limit of 2.2x10^3 events/sec on the burst gravitational-wave event rate in our Galaxy with a confidence level of 90%. This work sets a milestone and prospects on the search for burst gravitational waves, by establishing an analysis scheme for the observation data from an interferometric gravitational wave detector

产业政策实施对企业创新模式的影响研究——基于中国A股上市企业的微观证据

文章采用中国2001-2010年A股上市企业微观数据,以"五年规划"变更这一近似自然实验为依据构造了双重差分模型,分别讨论了产业政策实施对企业实质性创新和形式创新的影响。结果表明:产业政策的实施显著促进了企业形式性创新,而对企业实质性创新的激励作用不明显。按照企业性质和市场竞争程度对样本进行分类的进一步分析发现,在高市场竞争环境下,产业政策实施对国有企业与非国有企业的形式性创新和实质性创新行为均具有显著的促进作用,而在低竞争环境下,产业政策实施对企业形式性创新和实质性创新均无显著的激励作用。基于此,政府应加强创新策略识别机制的构建,强化市场选择,并通过弱化、破除行业垄断等手段进一步促进企业创新"量"和"质"的共同提升。国家自然科学基金面上项目(项目编号:71572164);;马克思主义消费心理学理论研究创新团队(项目编号:20720181104

2311 摩擦攪拌により組織改質した鋳造アルミニウム合金AC4CHの疲労挙動(S07-2 非鉄材料の疲労特性,S07 構造材料の疲労強度とき裂進展問題)

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