共查询到19条相似文献,搜索用时 116 毫秒
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双语教学是一种全新的教学模式.通过双语教学的实施,促进学生的英语学习,并且可以着力提高教与学双方的专业英语应用能力.波谱解析课程知识由于具有发展迅速、国际通用性及实用性等特点,所以双语教学已成为波谱解析课程教学改革的重要内容.本文对三段式、模块式等双语教学模式进行了探讨,并收到了较好的教学效果. 相似文献
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本文讨论NMR波谱与李代数表示论之间的联系及NMR波谱解析的李代数方法中的基本问题.若NMR中交换超算符方法中的算符集合生成的李代数为g,本文将讨论g的自然表示和伴随表示,g的典型性质,g的根系结构.提出了解析NMR波谱的三种李代数方法,列举了实例,显示了计算的具体步骤. 相似文献
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本文简要介绍了极化转移技术在提高不灵敏核的灵敏度方面以及在13CNMR波谱解析方面的应用,并给出了在FX系列谱仪上实现DEPT的方法。 相似文献
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Chemoffice 2005软件在波谱分析教学中的应用 总被引:5,自引:1,他引:4
在波谱学教学过程中应用Chemoffice 2005画图软件中的模拟NMR图谱和立体模型功能,讲解各种化学结构与核磁共振图谱的关系,使学生在大量实践的基础上更快地具有解析核磁图谱的能力. 相似文献
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应用正则变换和Bogoliubov变换讨论六角晶体结构亚铁磁体RbNiF_3的自旋波谱,在整个Brillouin区中得到了目旋波谱的解析形式,并与中子非弹性散射的实验结果作了比较。 相似文献
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针对数学物理方法课程教学中学生普遍反映比较抽象的解析延拓部分,设计以数值模拟方法为技术
路线的教学方案. 通过物理模型的构建,介绍线性响应理论和最大熵解析延拓方法的基本原理,全面设计课堂教学
环节,展示对具体实例的计算结果. 最后,对课程实践过程中的有待提高之处进行反思和探讨 相似文献
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G. C. La Rocca 《Il Nuovo Cimento D》1993,15(2-3):259-268
Summary Aperiodic structures which are perfectly ordered, but lack translational symmetry, can be considered as intermediate between
crystalline and amorphous systems. Their wave-functions and spectra exhibit unusual properties. A one-dimensional model, known
as the Thue-Morse lattice, is here investigated; it is particularly interesting because it is deterministic non-periodic,
but not quasi-periodic. The propagation of both electrons and photons is considered and the corresponding spectra are characterized
with a multifractal analysis. The multifractal scaling function τ(q) tends in both cases to a non-analytic limit that implies the presence of both extended and exponentially localized states,
as confirmed by the behaviour of the wave functions.
In honour of Prof. Fausto Fumi on the occasion of his retirement from teaching. 相似文献
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在红外光谱实验教学中建立了以基础实验、综合实验、自主设计实验为一体的三步式实验教学方法,激发学生的学习兴趣和科学研究热情,提高了实验教学效果。 相似文献
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Evan D. Hudspeth Danielle Cleveland Kathleen L. Batchler Phuong A. Nguyen Tracey L. Feaser Lauren E. Quattrochi 《光谱学快报》2013,46(1):99-115
We have evaluated a small portable Raman instrument on loan from B&W Tek, Inc., and have determined that it can successfully be used in the classroom both as a visual aid for teaching the fundamentals of Raman spectroscopy and for a variety of undergraduate experiments as a normal component of an instrumental analysis class. Having portable Raman instrumentation would allow the instructor to demonstrate the principles of Raman spectroscopy, as well as the concepts of calibration curves, blank subtraction, detection limits, and regression analysis. Both qualitative and quantitative types of experiments were done for solid Tylenol tablets, aqueous solutions of isopropyl alcohol, dimethyl sulfoxide, methanol, and ethanol, and gaseous CO2 and N2O4. Additionally, surface‐enhanced resonance Raman spectra of Rhodamine 6G were obtained using a chloride ion–activated silver colloid. Spectra from the B&W Tek, Inc., instrument were comparable to literature Raman spectra. 相似文献
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通过红外光谱实验教学,把理论知识贯穿于实验操作和解析中,选取典型的化合物,采用峰形比较法,让学生掌握解析红外谱图的一般规律。 相似文献
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多组分三维荧光重叠光谱是三维荧光光谱的数据解析中的难点之一。本文基于二维微分谱的计算原理, 充分利用三维荧光光谱具有激发光谱和发射光谱的特点, 获得了三维荧光光谱展开后的激发微分谱和发射微分谱. 之后利用独立成分分析对激发光谱或发射光谱的多组分混合微分谱分别进行解析, 得到了单一组分的激发微分谱和发射微分谱。其中三次样条插值有效的弥补了实测激发波长数据点少的缺点, 而粗糙惩罚平滑技术的引入则很大程度上减少了发射光谱的噪声,为微分谱的计算提供了有利的条件。单一组分的标准谱与解析谱的相似性系数的计算表明, 利用独立成分分析对微分谱进行解析更有利于多组分混合三维荧光光谱所含成分的识别。 相似文献
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Chang C Ren J Fung PC Hung YS Shen JG Chan FH 《Journal of magnetic resonance (San Diego, Calif. : 1997)》2005,175(2):242-255
Free radicals play important roles in many physiological and pathological pathways in biological systems. These free radicals can be detected and quantified by their EPR spectra. The measured EPR spectra are often mixtures of pure spectra of several different free radicals and other chemicals. Blind source separation can be applied to estimate the pure spectra of interested free radicals. However, since the pure EPR spectra are often not independent of each other, the approach based on independent component analysis (ICA) cannot accurately extract the required spectra. In this paper, a novel sparse component analysis method for blind source separation, which exploits the sparsity of the EPR spectra, is presented to reliably extract the pure source spectra from their mixtures with high accuracy. This method has been applied to the analysis of EPR spectra of superoxide, hydroxyl, and nitric oxide free radicals, for both simulated data and real world ex vivo experiment. Compared to the traditional self-modeling method and our previous ICA-based blind source separation method, the proposed sparse component analysis approach gives much better results and can give perfect separation for mixtures of superoxide spectrum and hydroxyl spectrum in the ideal noise-free case. This method can also be used in other similar applications of quantitative spectroscopy analysis. 相似文献
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Chlorophyll was extracted from fresh spinach leaves (Spinacia L.) and its absorption spectrum was recorded. Computational methods were used to optimize the geometry and energy of chlorophyll as well as to compute UV-Vis spectra of chlorophylls a and b and to compare them with the spectrum of chlorophyll extract. Chlorophyll bands are well predicted, especially with B3LYP/CIS and TD-B3LYP methods. This research project forms a modern approach to the process of spectroscopy teaching—students can apply quantum-mechanics calculations for understanding of reaction mechanisms with the involvement of biologically active compounds and learn to interpret the absorption spectra of chlorophyll extract obtained by themselves. 相似文献