7.5—30keVC^＋,N^＋,O^＋与H2分子碰撞的单电子俘获截面测量

建立了一套用于研究单价正离子与气体分子碰撞的单电子俘获过程的装置，测量了７．５－３０ｋｅＶ能量范围的Ｃ＋、Ｎ＋、Ｏ＋离子与Ｈ２分子碰撞单电子俘获截面。对于３０ｋｅＶ能量点，我们的实验结果和文献推荐值符合较好，其它能量点尚未见报道     

怀孕期头发中一些元素含量的变化趋势

用同步辐射激发X射线荧光分析,对11个产妇怀孕期间头发内一些元素含量的变化趋势进行了测量,在各自对比的基础上,得到了一些结果。     

H－与H及He~＋与He相互作用势能曲线的理论计算

采用通道耦合（ＣＣＱＴ）方法，并根据文献〔１〕提出的电子瞬时配对的平均效果形成未饱和共价键的物理模型来划分通道，分别对Ｈ－２和Ｈｅ＋２进行了计算，得到了较准确的基态能量和与实验相吻合的平衡距离，给出了Ｈ－与Ｈ及Ｈｅ＋与Ｈｅ相互作用势能曲线。文内体现了这样一个特点：好的物理模型结合好的方法能使较为复杂的问题得到大大简化     

石墨炉原子吸收法测定生物体液中有机锗

本文研究了石墨炉原子吸收光谱法测定人及动物口服丙氧锗二酸(Ge-132)后血浆及尿中锗浓度的方法。样品无需预先处理,加入Triton X-100后,可直接测定。为排除未消化生物样品对测定的干扰,本法对基体改进剂硝酸镍及硝酸钙的作用进行了比较,认为硝酸镍虽可明显提高水溶液中锗的吸收值,但对血浆中锗的影响不如硝酸钙,且镍浓度的变化对锗吸收的影响也较大,约需3～4mg/ml为宜。而钙剂对血浆及水溶液中锗的影响近似,含钙量大于0.5mg/ml均可获得相同的效果。残留在石墨炉中碳渣的影响不可忽视。本文采用通氧的办法消除了影响。本法绝对灵敏度为34pg/0.0044A,检出下限为1.6×10~(-9)g,线性范围0～200ng/ml Ge,变异系数(4个浓度)1.46～3.1%(n=10),回收率(4个浓度)为95.5～102.6%。     

Further conventions for NMR shielding and chemical shifts IUPAC recommendations 2008

IUPAC has published a number of recommendations regarding the reporting of nuclear magnetic resonance (NMR) data, especially chemical shifts. The most recent publication [Pure Appl. Chem. 73, 1795 (2001)] recommended that tetramethylsilane (TMS) serve as a universal reference for reporting the shifts of all nuclides, but it deferred recommendations for several aspects of this subject. This document first examines the extent to which the ¹H shielding in TMS itself is subject to change by variation in temperature, concentration, and solvent. On the basis of recently published results, it has been established that the shielding of TMS in solution [along with that of sodium-3-(trimethylsilyl)propanesulfonate, DSS, often used as a reference for aqueous solutions] varies only slightly with temperature but is subject to solvent perturbations of a few tenths of a part per million (ppm). Recommendations are given for reporting chemical shifts under most routine experimental conditions and for quantifying effects of temperature and solvent variation, including the use of magnetic susceptibility corrections and of magic-angle spinning (MAS).

This document provides the first IUPAC recommendations for referencing and reporting chemical shifts in solids, based on high-resolution MAS studies. Procedures are given for relating ¹³C NMR chemical shifts in solids to the scales used for high-resolution studies in the liquid phase. The notation and terminology used for describing chemical shift and shielding tensors in solids are reviewed in some detail, and recommendations are given for best practice.     

A study of multiparticle fragmentation inK + p interactions at 32 GeV/c

Results are presented on inclusive production of resonant and non-resonant particle systems produced inK ⁺ p interactions at 32 GeV/c. We compareK ^*+(892), \(\bar \Sigma ^{ * - } \) (1385), Σ^*±(1385), and ?⁰ inclusivex-spectra with the ones of non-resonantK _s ⁰ π^±, \(\bar \Lambda \pi ^ - \) , Λπ^± and π⁺π^? pairs at the same effective mass. Resonance-particle pairsK ^*+π^±, Σ^*+π^?, and \(\bar \Sigma ^{ * - } \pi ^ - \) are also studied together with non-resonant tripletsK _s ⁰ π^±, Λπ⁺π^?, \(\bar \Lambda \pi ^ - \pi ^ - \) . The invariantx-spectra of resonant particle pairs decrease less rapidly withx then the corresponding non-resonant pairs. Comparison with quark-recombination predictions indicates that the particles, resonances and multiparticle systems are probably created off a single valence quark or diquark instead of carrying all possible valence-quarks.     

Observation of a narrowK s 0 K s 0 π+π− state at 1.97 GeV produced inK + p interactions at 32 GeV/c

Evidence is provided for a new resonance in theK _s ⁰ K _s ⁰ π⁺π^? system with a mass of 1.97±0.01 GeV and width 40±20 MeV. It is produced with an inclusive cross section of ～6μb in the beam fragmentation process of 4-prongK ⁺ p interactions with at least 2 associatedV ⁰'s at 32 GeV/c and decays dominantly into theK ^{* ±} (892)K _s ⁰ π^? mode.     

激光血管外照射治疗可行性研究

为探讨激光血管外照射治疗的可行性,测试了人活体血管外照射以及模拟血管内照射的光能流率分布情况。研究表明,激光血管内、外照射的总光能流率的平均值分别为10.81W/cm²与1.11W/cm²,两者相差一个数量级。为获得血管内照射相应的光能流率,建议采用20mW632.8nmHe-Ne激光;垂直入射于人皮肤外表:尽可能选择血管暴露的病人或较为暴露的血管;选择被照射血管直径为6mm左右。本实验结果,特别是在人活体血管内探测到的实验数据,将有益于光在人体组织内传播特性的研究。     

傅里叶变换红外光谱法研究肺组织切片

采用傅里叶变换红外光谱(FTIR)仪并借助OMNI采样器直接、快速地测定了正常肺组织及肺癌组织的红外光谱,通过研究表明,正常肺组织与肺癌组织样品的红外光谱在峰位、峰强及峰形等方面均存在明显而有规律的红外光谱差异,这反映了组织中的蛋白质、核酸和脂类等生物分子在不同性质的组织中含量上的差异。研究表明,FTIR可从分子水平上揭示正常肺组织和肺癌组织的特性,能对正常肺组织和肺癌组织的良、恶性的鉴别提供丰富而可靠的结构信息。     

S2分子X^3—Σ^—g和B^3Σ^—u态的势能函数和振动光谱特征

应用实验光谱数据，导出了Ｓ２的基态分子Ｘ３Σ－ｇ和激发态Ｂ３Σ－ｕ的ＭｕｒｅｌＳｏｒｂｉｅ势能函数，并用ＱＣＩＳＤ（Ｔ）／６－３１１Ｇ方法对基态进行了计算，结果在吸引支出现了回避相交而产生了一个浅平极大，其他部位与实验结果符合甚好。计算了Ｂ３Σ－ｕ和Ｘ３Σ－ｇ态的全部振动能级，以及激发态（Ｂ３Σ－ｕ）振动能级≤９和基态（Ｘ３Σ－ｇ）振动能级≤３０之间的Ｄｅｓｌａｎｄｒｅｓ表。给出了Ｂ３Σ－ｕ－Ｘ３Σ－ｇ跃迁Ｃｏｎｄｏｎ抛物线，各振动态的计算结果与实验值很好符合。