浅谈高校图书馆轮岗机制的引入

阐述了高校图书馆引入轮岗机制的可行性和必要性，提出了在高校图书馆引入轮岗机制的具体措施。     

Dipole bands in nucleus ~(139)Pm

High-spin states in nucleus 139Pm have been studied using the reaction 116Cd(27Al,4n)139Pm.Two dipole cascades have been found.Spin and parity assignments were based on the Directional Correlation of Oriented Nuclei(DCO) ratios and systematic behavior in neighboring odd-proton nuclei.The level structures of 139Pm are compared with those of the N =78 isotone 141Eu in which two dipole bands have been confirmed as magnetic rotational bands.The close similarity between them suggests that the dipole bands in 139...     

因子分析在学生成绩影响因素调查结果中的应用

因子分析基本思想是通过对多个原始变量提取主成分,经过正交旋转,可以找出主要的独立影响因素。通过对学生的多因素多样本问卷调查,将因子分析应用于教育教学数据分析之中,从而找出影响学生学习成绩的主要原因,为进一步的教育教学改革提供了一定的理论依据。     

Dynamical structure of peptide molecules: Fourier transform microwave spectroscopy and ab initio calculations of N-methylformamide

Rotational spectra of both trans and cis forms of the N-methylformamide normal as well as deuterated (HCONDCH₃, referred to as N-D) species were observed by Fourier transform microwave spectroscopy in the frequency region from 5 to 118 GHz. Samples were prepared in the form of a beam by a pulsed jet valve maintained at 50 °C and were introduced in a high-vacuum cavity cell, with either Ne or Ar as a carrier gas at a backing pressure of 100 kPa. The observed spectra were analyzed to yield molecular parameters including rotational constants and barrier, V₃, to CH₃ internal-rotation: 53.9 (6) and 301 (4) cm⁻¹ for the trans and cis forms of the normal species, respectively, and 41.9 (6) and 309 (4) cm⁻¹ for the trans and cis forms of the N-D species, respectively. Spectra of four trans isotopologues with ¹³C, ¹⁵N, or ¹⁸O singly-substituted in the internal-rotation A state were observed and analyzed to derive the r_s structure of the trans form. For comparison with the experimental data, ab initio calculations were carried out at MP2/6-31G∗∗ level to derive molecular structure, potential barrier to CH₃ internal rotation, and the energy difference between the cis and trans forms. An extensive coupling was found between the CH₃ internal rotation and N-H out-of-plane bending, suggesting that the potential function for the CH₃ internal-rotation deviates considerably from a simple cos(3α) form. The effects of the V₆ term is briefly discussed.     

Rotation rate of a three-wing rotor illuminated by upward-directed focused beam in optical tweezers

The optical torque and the trapping position (focal point) in optical tweezers are analyzed for upward-directed focused laser illumination using a ray optics model, considering that laser light is incident at not only the lower surface but also the side surface of a 3-wing rotor. The viscous drag force due to the pressure and the shearing stress on all surfaces of the rotor is evaluated using computational fluid dynamics. The rotation rate is simulated in water by balancing the optical torque with the drag force, resulting in 500 rpm for an SU-8 rotor with 20 μm diameter at a laser power of 200 mW. The trapping position is estimated to be 7.6 μm in the rotor with an upward-directed laser at 200 mW via an objective lens having a numerical aperture of 1.4. Both the rotation rate and the trapping position agree well with the values obtained in the experiment.     

N-水杨酰胺与磷酰二氯反应产物的~1HNMR鉴定

本文用~1HNMR分析方法,对由N—(杂环基甲基)水杨酰胺与(硫代)磷酰二氯关环反应的产物结构的鉴定进行了讨论。     

一个单叶解析函数族的推广

设函数在单位圆盘｜ｚ｜＜１内解析，且１，其中｛αｎ｝为一正实数序列．记具有这种性质的函数ｆ（ｚ）的全体为Ｓ（αｎ）．本文证明，如果ｆ（ｚ）∈Ｓ（αｎ），且αｎ≥［（ｎ－１）（αｐ－１）＋ｐ－１］／（ｐ－１），则ｆ（ｚ）为α阶星象函数，其中α＝（αｐ－ｐ）／（αｐ－１）．特殊情形，当αｎ＝ｎ，ｐ＝２时，Ｓ（ｎ）为众所周知的ＡＷ．Ｃｏｏｄｍａｎ（１９５７）关于原点的星象函数族，此外，本文还研究了Ｓ（αｎ）的单叶性条件，变形定理，旋转定理以及关于任意点为星象的条件，其中定理７和推论１推广了Ｈ．Ｓｉｌｖｅｒｍａｎ（１９５７）的一些结果．     

物体水平运动左右偏转分析

物体水平运动偏转是地理教学中的难点．本文用地面坐标系旋转和“纬度差”两种方法对该问题加以阐述和分析．