多齿配体改性的氧化锆色谱固定相表面吸附方式的研究

氧化锆微球的化学稳定性好且机械强度高,作为色谱固定相基质具有很好的应用前景,利用其表面存在的大量的Lewis酸性中心与Lewis碱性化合物的强烈的酸碱作用可对氧化锆进行吸附改性,用无机磷酸、烷基膦酸APA、硬脂酸SA及乙二胺-N,N′-四亚甲基膦酸(EDTPA)等改性的氧化锆固定相被成功地用于中性、碱性甚至酸性化合物的分离。     

可见光分幅相机及其在Z箍缩诊断中的应用

研制了一套纳秒级可见光分幅相机,用于"强光一号"早期放电过程的观察和诊断.介绍了相机的主要性能,利用该相机得到了丝阵负载z箍缩等离子体的可见光图像,对结果进行了分析.     

Verification of Energetic-Particle-Induced Geodesic Acoustic Mode in Gyrokinetic Particle Simulations

The energetic-particle-induced geodesic acoustic mode(EGAM) is studied using gyrokinetic particle simulations in tokamak plasmas.In our simulations,exponentially growing EGAMs are excited by energetic particles with a slowing-down distribution.The frequencies of EGAMs are always below the frequencies of GAMs,which is due to the non-perturbative contribution of energetic particles(EPs).The mode structures of EGAMs are similar to the corresponding mode structures of GAMs.Our gyrokinetic simulation...     

HXMT卫星的观测规划与数据处理

HXMT卫星在轨运行期间,需要开展一系列的空间观测,以便对天文现象进行研究。空间探测涉及到多个过程,需要考虑多种因素的约束,本文将详细给出从观测任务的提出,到任务安排、数据处理及科学分析的全过程。     

闪烁光激励下大芯径阶跃光纤系统的时间响应研究

引入材料色散和漏泄模式光线的传输效应,对D. Gloge多模光纤脉冲响应公式进行修正,利用修正后公式数值计算了在闪烁光激励下纤芯半径为0.1 mm、长50 m的石英阶跃光纤的冲击响应波形,该波形近似一高斯函数,半高宽为3 ns,前沿比后沿慢0.8 ns,且后沿存在拖尾。用该响应波形通过数值方法得到了闪烁体-光纤系统时间响应波形,与实验结果相比较,两者基本吻合。     

丝阵负载Z箍缩可见光图像诊断系统

主要介绍了为“强光一号”加速器丝阵负载Z箍缩实验设计的可见光图像诊断系统,系统时间分辨约为5 ns,空间分辨约为6.5 lp/mm,光谱响应范围365~750 nm。系统能够满足从早期单丝电离到等离子体柱飞散整个Z箍缩过程的诊断要求, 给出了系统在Z箍缩实验中获得的丝阵负载内爆图像序列,并对其反映的内爆现象进行了初步的唯象分析。     

慧眼运行与科学成果——慧眼观天四年记

目前,慧眼科学中心已制定700余个短期观测计划和30余个ToO观测计划（http：//hxmt.cn/ObsPlan.jhtml）,顺利完成了所有观测需求,为慧眼卫星科学目标的实现和科学成果的产出提供了重要保障。     

采用二氯马来酰亚胺与芳香胺的亲核取代聚合反应合成有机多孔聚合物

首先以二氯马来酸酐和1,2-环己二胺为原料合成了卤代烃1,2-双(3,4-二氯马来酰亚胺)基环己烷;然后通过该卤代烃与1,3,5-三(4-氨基苯基)苯的亲核取代聚合反应,制备了一种有机多孔聚合物(POP)。采用扫描电子显微镜(SEM)、热重分析(TG)、氮气吸附-脱附等测试手段对聚合物的形貌、稳定性以及孔结构进行了研究。结果表明:该多孔聚合物具有独特的棒状结构、优良的热稳定性(初始分解温度达400℃)、较大的比表面积(404m~2/g),且具有多级孔(介孔和微孔)结构。     

Intermolecular forces between acetylcholine and acetylcholinesterases studied with atomic force microscopy

With the aid of atomic force microscopy, the intermolecular forces between acetyleholinesterases (AChE) and its natural substrate acetylcholine (ACh) have been studied. Through force spectrum measurement based on imaging of AChE molecules it was found that the attraction force between individual molecule pairs of ACh and AChE was (10±1) pN just before the quaternary ammonium head of ACh got into contact with the negative end of AChE and the decaying distance of attraction was (4±1) nm from the surface of ACHE. The adhesion force between individual ACh and AChE molecule pairs was (25±2) pN, which had a decaying feature of fast-slow-fast (FSF). The attraction forces between AChE and choline (Ch), the quaternary ammonium moiety and hydrolysate of ACh molecule, were similar to those between AChE and ACh. The adhesion forces between AChE and Ch were (20±2) pN, a little weaker than that between ACh and ACHE. These results indicated that AChE had a steering role for the diffusion of ACh toward it and had r     

分光光度法研究硫氰酸钼(Ⅴ)络合物的萃取行为

引 言作者用光度法研究了在不同浓度的二甲基亚砜(DMSO)-水(H_2O)溶液中,用石油亚砜(PSO)-四氯化碳(CCl_4)为萃取剂时对硫氰酸钼(V)络合物的萃取行为,研究了DMSO在该混合溶液中的量对该络合物萃取的影响,并对实验结果进行了解释.发现在DMSO-H_2O体积比为2%且NH_4 SCN溶液浓度达0.1mol/L时,硫氰酸钼的萃取率可达90%以上,表明MoO(SCN)_3这一萃取体系似具有应用价值.2 实验部分2.1 试剂与仪器 除硫氰酸铵溶液用银量法标定外,其余均由试剂直接称量配制成实验所需浓度的溶液,所用试剂均为分析纯.用721-100型光度计(上海第三分析仪器厂)测定.