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关于包含奇-偶下标第二类契贝谢夫多项式的恒等式 总被引:7,自引:0,他引:7
给出了一类包含偶下标第二类契贝谢夫多项式和一类包含奇下标第二类契贝谢夫多项式求和的递推公式,得到了一些包含偶下标第二类契贝谢夫多项式和奇下标第二类契贝谢夫多项式的恒等式. 相似文献
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邓欣蒋娅兰黄芳罗辉泰朱志鑫林晓珊黄晓兰吴惠勤 《分析试验室》2018,(4):454-460
建立了中药材中30种人工色素的高效液相色谱-串联质谱(LC-MS/MS)筛查测定方法。试验优化了前处理方法,分离条件和质谱参数。样品采用甲醇超声,提取液经亚3μm填料色谱柱Agilent Poroshell 120 EC-C18(3.0 mm×100 mm,2.7μm)分离,乙腈-水(10 mmol/L乙酸铵)为流动相梯度洗脱,流速0.30 m L/min,采用电喷雾离子源,正、负离子切换采集模式多反应选择离子监测(MRM)。30种人工色素及其中的3对同分异构体得到了理想分离和定性定量。本法简便、快速、准确可靠,已经应用于中药材中非法添加的人工色素的筛查及检测。 相似文献
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用量子化学密度泛函方法结合导体极化连续模型研究了具有潜在抗肿瘤活性的NAMI-A型钌配合物(HL)[trans-RuCl4L(dmso-S)](L=1-methyl-1,2,4-triazole,dmso-S=S-dimethyl sulfoxide) (1)的水解反应过程.计算得到该配合物水解反应过程中相应的结构特征和详细的反应势能面.对于第一步水解,液相中配合物1的活化能垒比已经报道的抗肿瘤药物(Him)[trans-RuCl4( 相似文献
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We demonstrate the growth of terahertz quantum cascade laser (THz QCL) by gas source molecular beam epitaxy. X-ray diffraction and cross-sectional transmission electron microscopic measurements show the high crystalline quality of the THz QCL active region, From the cross-sectional transmission electron microscopy image, sharp interfaces are observed and the deduced cascade period thickness is consistent with the result of x-ray diffraction. The test device is lasing at 3.39THz and operating up to lOOK in pulsed mode. At IOK, the maximum output power is greater than 1 mW with a threshold current density of 738 A/cm^2. 相似文献
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高速的安全量子密钥传输对于实际应用有很大的意义,本文从提高密钥分发的速率为出发点,提出一种基于FPGA的高速连续变量量子密钥分发的解决方案。从而有望使安全密钥分发的速率在长距离传输下达到Mbps数量级。 相似文献
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Single-frequency distributed Bragg reflector Tm:YAG ceramic derived all-glass fiber laser at 1.95 μm 下载免费PDF全文
Guo-Quan Qian 《中国物理 B》2022,31(12):124205-124205
A 135 mW single-frequency distributed Bragg reflector fiber laser at 1.95 μm was obtained based on a Tm:YAG ceramic-derived all-glass fiber. The fiber laser achieved an optical signal-to-noise ratio of ~ 77 dB. Moreover, the threshold and linewidth of the single-frequency laser were measured to be 15.4 mW and 4.5 kHz, respectively. In addition, the measured relative intensity noise was less than -140 dB· Hz-1 at frequencies of over 10 MHz. The results show that the as-drawn Tm:YAG ceramic-derived all-glass fiber is highly promising for ~ 2 μm single-frequency fiber laser applications. 相似文献
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