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Periodicity Search on X-Ray Bursts of SGR J1935+2154 Using 8.5 yr of Fermi/GBM Data 期刊论文 OAI收割
The Astrophysical Journal, 2021, 卷号: 923, 页码: L30
作者: HXMT

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收藏 | 浏览/下载：22/0 | 提交时间：2022/02/08

2008 1471 Astrophysics - High Energy Astrophysical Phenomena Abstract: We performed a systematic search for X-ray bursts of the SGR J1935+2154 using the Fermi Gamma-ray Burst Monitor continuous data dated from 2013 January to 2021 October. Eight bursting phases, which consist of a total of 353 individual bursts, are identified. We further analyze the periodic properties of our sample using the Lomb-Scargle periodogram. The result suggests that those bursts exhibit a period of ~238 days with a ~63.2% duty cycle. Based on our analysis, we further predict two upcoming active windows of the X-ray bursts. Since 2021 July, the beginning date of our first prediction has been confirmed by the ongoing X-ray activities of the SGR J1935+2154.

Constraining the X-Ray-Infrared Spectral Index of Second-timescale Flares from SGR 1935+2154 with Palomar Gattini-IR 期刊论文 OAI收割
The Astrophysical Journal, 2020, 卷号: 901, 页码: L7
作者: HXMT

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Radio transient sources Magnetars Soft gamma-ray repeaters 2008 992 1471 Astrophysics - High Energy Astrophysical Phenomena Astrophysics - Instrumentation and Methods for Astrophysics Abstract: The Galactic magnetar SGR 1935+2154 has been reported to produce the first example of a bright millisecond-duration radio burst (FRB 200428) similar to the cosmological population of fast radio bursts (FRBs). The detection of a coincident bright X-ray burst represents the first observed multiwavelength counterpart of an FRB. However, the search for similar emission at optical wavelengths has been hampered by the high inferred extinction on the line of sight. Here, we present results from the first search for second-timescale emission from the source at near-infrared (NIR) wavelengths using the Palomar Gattini-IR observing system in the J band, enabled by a novel detector readout mode that allows short exposure times of ?0.84 s with 99.9% observing efficiency. With a total observing time of ?12 hr (?47,728 images) during its 2020 outburst, we place median 3Ҡlimits on the second-timescale NIR fluence of ?18 Jy ms (13.1 AB mag). The corresponding extinction-corrected limit is ?125 Jy ms for an estimated extinction of A_J = 2.0 mag. Our observations were sensitive enough to easily detect an NIR counterpart of FRB 200428 if the NIR emission falls on the same power law as observed across its radio to X-ray spectrum. We report nondetection limits from epochs of four simultaneous X-ray bursts detected by the Insight-HXMT and NuSTAR telescopes during our observations. These limits provide the most stringent constraints to date on fluence of flares at 10¹⁴ Hz, and constrain the fluence ratio of the NIR emission to coincident X-ray bursts to R_NIR ? 0.025 (fluence index ?0.35).

长江三角洲经济区的由来和发展 期刊论文 OAI收割
现代城市研究, 2009, 期号: 10, 页码: 41132
作者: 佘之祥

收藏 | 浏览/下载：20/0 | 提交时间：2012/03/23

长江三角洲地区:5378 长三角地区:5359 长江三角洲经济区:4140 上海经济:3432 区域内:1629 地区规划:1514 经济与社会:1496 经济腹地:1471 可持续发展:1445 水资源:1405

开发生产长效碳酸氢铵增强小氮肥企业活力 期刊论文 OAI收割
中国农资, 2007, 期号: 10, 页码: 1664-1669
作者: 李荣华

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收藏 | 浏览/下载：19/0 | 提交时间：2011/05/05

长效碳酸氢铵:7370 氮素利用率:2932 开发生产:2699 长效复合肥:2618 有机无机复合肥:2392 碳铵:2329 肥效期:1939 小氮肥企业:1931 小氮肥厂:1471 含氮量:1456

开发生产长效碳酸氢铵增强小氮肥企业活力 期刊论文 OAI收割
中国农资, 2007, 期号: 10, 页码: 1664-1669
李荣华

收藏 | 浏览/下载：166/43 | 提交时间：2011/05/05

长效碳酸氢铵:7370,氮素利用率:2932,开发生产:2699,长效复合肥:2618,有机无机复合肥:2392,碳铵:2329,肥效期:1939,小氮肥企业:1931,小氮肥厂:1471,含氮量:1456

survey of information security 期刊论文 OAI收割
SCIENCE IN CHINA SERIES F-INFORMATION SCIENCES, 2007, 卷号: 50, 期号: 3, 页码: 273-298
Shen ChangXiang; Zhang HuangGuo; Feng Dengguo; Cao Zhenfu; Huang Jiwu

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收藏 | 浏览/下载：17/0 | 提交时间：2011/07/01

公允价值:8570 价值计量:3241 历史成本计量:2019 利润操纵:1471 公平交易:1458 会计收益:1407 新体系:1371 运用:1239 准则体系:1066 本质特征:1064information security cryptology trusted computing network security information hiding

微腔物理及微腔激光 会议论文 OAI收割
中国吉林长春
作者: 王立军; 宁永强; 刘星元

收藏 | 浏览/下载：40/0 | 提交时间：2013/03/19

微腔效应:6864 光学微腔:5343 谐振腔:2324 物理现象:2192 应用前景:1871 激光器件:1843 光子:1471 国内首次:1443 三基色:1328 微型:1098

硼酸盐的红外光谱 期刊论文 OAI收割
盐湖研究, 1995, 期号: 3, 页码: 49-53
作者: 李武

收藏 | 浏览/下载：215/0 | 提交时间：2012/12/18

硼酸盐:5943 红外光谱:5447 硼氧酸盐:4778 多聚硼氧配阴离子:1789 三配位:1471 三角形配位:1229 四配位:1223 四面体配位:1147 振动频率:1139 配位多面体:1084

海洋细菌对钢铁的腐蚀 期刊论文 OAI收割
材料保护, 1995, 期号: 4, 页码: 23-24
马士德; 李言涛; 谢肖勃; 李春霖; 李洪岭; 吴培辉

收藏 | 浏览/下载：31/0 | 提交时间：2013/10/08

海洋细菌:8187 硫酸盐还原菌:3674 钢铁腐蚀:2517 牺牲阳极:1826 腐蚀速度:1471 氧化铁杆菌:1405 硫化物:1348 去磺弧菌:1190 排硫杆菌:1112 海洋沉积物:1081

生物海洋学研究中~(15)N技术的方法与问题 期刊论文 OAI收割
海洋科学, 1993, 期号: 1, 页码: 25-29
焦念志

收藏 | 浏览/下载：24/0 | 提交时间：2013/10/08

生物海洋学研究:6823 方法与问题:4821 N源:3013 培养时间:2504 吸收率:1723 异速:1671 真光层:1632 质谱法:1471 15N丰度:1471 本底浓度:1440