波片光轴偏差对偏振分光光束振幅和相位的影响研究

研究了在线偏振光入射、波片和偏振分束器结合使用时波片光轴偏差对偏振分束器分出的两束光的振幅和相位的影响。给出了在两种放置情况下,任意波片光轴方向偏差对偏振分光光束振幅和相位影响的表达式。详细分析了1/4波片和1/8波片的影响性质,给出了具体的振幅和相位影响关系式。     

基于光栅衍射的实验分析

对当前高校本科生中开设的关于光栅衍射实验对学生的培养点、教学点进行了分析,介绍了新开设的光栅衍射实验,对照光栅衍射特性下的各种效应进行了比较分析。     

Lagrange multiplier method used in BESⅢ

In this paper, the kinematic fitting with the Lagrange multiplier method has been studied for BESⅢ experiment. First we introduce the Lagrange multiplier method and implement kinematic constraints. Then we present the performance of the kinematic fitting algorithm. With the kinematic fitting, we can improve the resolution of track parameters and reduce the background.     

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介绍射频辉光放电等离子体改善苎麻织物毛细效应的时效性的实验。分别在充入氩气、氮气、氧气的真空室中对苎麻织物进行射频辉光放电等离子体处理,在每一种处理过程中分别改变其处理时间、放电功率和真空室压强。测试了放置不同时间的经不同等离子体参数处理后的苎麻织物的毛细效应,得出各种参数的等离子体处理对苎麻织物毛细效应时效性的影响。实验结果表明,苎麻织物被等离子体离子体处理后毛细效应得到明显改善,其毛细效应随放置时间的变化为先快速下降,然后变缓,逐渐趋于稳定,这种毛细效应的改善具有良好的时效性,其中100W、40Pa的氧等离子体处理20分钟后的苎麻织物的毛细效应时效性最好。     

Lagrange multiplier method used in BESⅢ kinematic fitting

In this paper,the kinematic fitting with the Lagrange multiplier method has been studied for BESⅢ experiment.First we introduce the Lagrange multiplier method and implement kinematic constraints.Then we present the performance of the kinematic fitting algorithm.With the kinematic fitting,we can improve the resolution of track parameters and reduce the background.     

GRB 090423: Marking the death of a massive star at z=8.2

GRB 090423 is the new high-z record holder of Gamma-ray bursts (GRBs) with z～ 8.2. We present a detailed analysis of both the spectral and temporal features of GRB 090423 observed with Swift/BAT and Fermi/GBM. We find that the T ₉₀ observed with BAT in the 15–150 keV band is 13.2 s, corresponding to ～ 1.4 s at z=8.2. It once again gives rise to the issue of whether the progenitors of high-z GRBs are massive stars or mergers since the discovery of GRB 080913 at z=6.7. In comparison with the T ₉₀ distribution in the burst frame of the current redshift-known GRB sample, we find that it is marginally grouped into the long group (Type II GRBs). The spectrum observed with both BAT and GBM is well fitted by a power-law with exponential cutoff, which yields an E _p=(50.4±7.0) keV. The event satisfies the Amati-relation well for Type II GRBs within their 3σ uncertainty range. Our results indicate that this event would be produced by the death of a massive star. Based on the Amati-relation, we derive its distance modulus, which follows the Hubble diagram of the concordance cosmology model at a redshift of ～8.2.     

The flux-E p relation within GRB060218 in comparison with typical GRB pulses

The prompt gamma-ray/X-ray emission of gamma-ray burst (GRB) 060218 was simultaneously observed by the Burst Alert Telescope (BAT) and X-ray Telescope (XRT) onboard Swift. Its peak energy of the joint vf _v spectrum (E _p) clearly evolves with time from tens of keV to ∼1 keV, crossing both the BAT and XRT bands. The best fit yields log E _p=(4.61±0.23)+(−1.29±0.08) log t, with a correlation coefficient of 0.98 and a chance probability of p<10⁻⁴. We derive its bolometric flux (F) in the 0.01–10⁴ keV band, and find that its F-E _p relation, with a power-law index of 0.37, is much shallower than that observed in typical GRB pulses. Discussion of this shallowness is presented.

     

近红外光谱丸剂关键辅料炼蜜水分的快速测定

用近红外光谱法实现嫩,中,老三种炼蜜含水量的快速测定及不同炼制程度蜂蜜的快速分级。过程化控制是中药质量稳定的关键因素,但由于检测手段的滞后而无法实现,因而影响中药质量。蜜丸是具广阔应用市场的剂型;炼蜜工艺是影响蜜丸质量的关键工序;在炼蜜过程中,蜂蜜从嫩蜜炼制到中蜜仅需几至几十秒,变化迅速,传统检测手段不能对蜂蜜炼制过程进行实时监测,进而无法保证炼蜜质量的均一性。力求采用近红外光谱法（NIRS）对炼蜜过程进行实时检测,准确控制嫩蜜、中蜜的炼制程度,并对其含水量进行定量测定。实验通过Rudolph折光仪测定不同炼蜜的含水量,并快速测定样品的近红外光谱,结合偏最小二乘法（PLS）建立并优化88批炼蜜水分的定量模型,利用校正模型决定系数（R2）、校正模型均方根误差（RMSEE）;内部交叉验证决定系数（R2）,内部交叉验证均方根误差（RMSECV）;预测模型的相关系数（r）、预测均方根误差(RMSEP)对校正模型进行评价,其中RMSECV主要用来筛选建立模型的最佳主成分数,RMSEE和RMSEP分别对所建立校正集和验证集进行误差分析。同时采用鉴别分析法建立定性模型用来区分炼蜜等级。经不断优化,图谱经矢量归一化法（SNV）预处理后,在7 201.2~5 446.2 cm-1波段内选取9个主成分建立水分模型。建立的最佳模型中,校正集R2, RMSEE分别为99.43,0.299,内部交叉验证R2,RMSECV分别为99.05,0.348;预测集R2,RMSEP分别为98.19,0.347;定量模型显示,NIRS可快速、准确、无损的对炼蜜含水量进行测定。同时按照含水量测定结果对炼蜜嫩、中、老3个等级进行划分,进而采用鉴别分析法对炼蜜进行定性分析,结果显示嫩、中、老3种炼蜜有明显的聚类现象,表明因子化法是鉴别炼蜜程度的一种有效方法;综上所述,NIRS可望实现对炼蜜过程实时监测,准确控制嫩蜜,中蜜的炼蜜程度并对炼蜜含水量进行快速实时定量测定,为不同炼蜜等级划分提供参考,保证炼蜜质量的均一性,最终保证蜜丸质量的稳定性。     

Circumdatin M,a new benzodiazepine alkaloid with a unique pyrimidone-4-pyrone moiety from a Hawaiian marine fungus Aspergillus sp. FM242

A new benzodiazepine alkaloid, circumdatin M (1), with a rare pyrimidone-4-pyrone moiety was isolated from a Hawaiian marine fungus Aspergillus sp. FM242. The structure of compound 1 was determined by analysis of HRMS and NMR spectroscopic data, and DP4+ NMR calculations. The absolute configurations of compound 1 were assigned by CD calculations. Compound 1 was tested inactive against A2780 and A2780CisR.