通过比较美国《化学文摘》(Chem ica l A bstracts,简称CA)2001-2004年收录《广西师范大学学报:自然科学版》(简称《学报》)的102篇文摘的题目与发表在《学报》的原英文题目,分析CA修改的原因,并与国际知名刊物英文题目进行比较,找出《...通过比较美国《化学文摘》(Chem ica l A bstracts,简称CA)2001-2004年收录《广西师范大学学报:自然科学版》(简称《学报》)的102篇文摘的题目与发表在《学报》的原英文题目,分析CA修改的原因,并与国际知名刊物英文题目进行比较,找出《学报》英文题目撰写方面的不足,即冠词误用、study of(on)等泛滥、专业词汇及缩写错误、词性误用、名词单复数误用、介词误用等,并给出提高科技论文英文题目质量的措施。展开更多
根据总体最小二乘（total least squares，TLS）模型理论，提出了一种影像端元光谱可受噪声污染的混合光谱线性扩展模型，并实现了该模型的端元光谱自动迭代提取以及混合像元的限定性分解。实验结果表明，扩展的混合像元分解模型明显...根据总体最小二乘（total least squares，TLS）模型理论，提出了一种影像端元光谱可受噪声污染的混合光谱线性扩展模型，并实现了该模型的端元光谱自动迭代提取以及混合像元的限定性分解。实验结果表明，扩展的混合像元分解模型明显优于传统的最小二乘分解模型，总体精度大约提高了10％～20％。展开更多
本文论述了Learning by Doing,Learning by Abstracting,Learning by Analogy,Learning byTeaching以及Learing by Simulating等教学模式。分析了其优点,并介绍了我们将其应用于嵌入式软件开发导论和系统结构等课程的效果。文中尤其强调...本文论述了Learning by Doing,Learning by Abstracting,Learning by Analogy,Learning byTeaching以及Learing by Simulating等教学模式。分析了其优点,并介绍了我们将其应用于嵌入式软件开发导论和系统结构等课程的效果。文中尤其强调了Learning by Abstracting的重要性。展开更多
Sentence similarity computing plays an important role in machine question-answering systems, machine-translation systems, information retrieval and automatic abstracting systems. This article firstly sums up several m...Sentence similarity computing plays an important role in machine question-answering systems, machine-translation systems, information retrieval and automatic abstracting systems. This article firstly sums up several methods for calculating similarity between sentences, and brings out a new method which takes all factors into consideration including critical words, semantic information, sentential form and sen-tence length. And on this basis, a automatic abstracting system based on LexRank algorithm is implemented. We made several improvements in both sentence weight computing and redundancy resolution. The system described in this article could deal with single or multi-document summarization both in English and Chinese. With evaluations on two corpuses, our system could produce better summaries to a certain degree. We also show that our system is quite insensitive to the noise in the data that may result from an imperfect topical clustering of documents. And in the end, existing problem and the developing trend of automatic summariza-tion technology are discussed.展开更多
The three potential surfaces for reactions of the O atom to abstract H atoms from CH2F2 and CH2Cl2 were studied using the ab initio method. The frequencies, geometries and energies of all species are calculated. The b...The three potential surfaces for reactions of the O atom to abstract H atoms from CH2F2 and CH2Cl2 were studied using the ab initio method. The frequencies, geometries and energies of all species are calculated. The best estimates of the heat of reactions are 30.92 KJ/mol and 13.01 KJ/mol, and, the best potential barrier heights for both reactions are calculated to be 74.50 KJ/mol and 67.22 KJ/mol, respectively. the second-order rate coefficients calculated are 2.8721x10(-21) and 4.2522x10(-20) cm(3)/molecule-s at 298 K, respectively.展开更多
文摘通过比较美国《化学文摘》(Chem ica l A bstracts,简称CA)2001-2004年收录《广西师范大学学报:自然科学版》(简称《学报》)的102篇文摘的题目与发表在《学报》的原英文题目,分析CA修改的原因,并与国际知名刊物英文题目进行比较,找出《学报》英文题目撰写方面的不足,即冠词误用、study of(on)等泛滥、专业词汇及缩写错误、词性误用、名词单复数误用、介词误用等,并给出提高科技论文英文题目质量的措施。
文摘根据总体最小二乘（total least squares，TLS）模型理论，提出了一种影像端元光谱可受噪声污染的混合光谱线性扩展模型，并实现了该模型的端元光谱自动迭代提取以及混合像元的限定性分解。实验结果表明，扩展的混合像元分解模型明显优于传统的最小二乘分解模型，总体精度大约提高了10％～20％。
文摘本文论述了Learning by Doing,Learning by Abstracting,Learning by Analogy,Learning byTeaching以及Learing by Simulating等教学模式。分析了其优点,并介绍了我们将其应用于嵌入式软件开发导论和系统结构等课程的效果。文中尤其强调了Learning by Abstracting的重要性。
文摘Sentence similarity computing plays an important role in machine question-answering systems, machine-translation systems, information retrieval and automatic abstracting systems. This article firstly sums up several methods for calculating similarity between sentences, and brings out a new method which takes all factors into consideration including critical words, semantic information, sentential form and sen-tence length. And on this basis, a automatic abstracting system based on LexRank algorithm is implemented. We made several improvements in both sentence weight computing and redundancy resolution. The system described in this article could deal with single or multi-document summarization both in English and Chinese. With evaluations on two corpuses, our system could produce better summaries to a certain degree. We also show that our system is quite insensitive to the noise in the data that may result from an imperfect topical clustering of documents. And in the end, existing problem and the developing trend of automatic summariza-tion technology are discussed.
文摘The three potential surfaces for reactions of the O atom to abstract H atoms from CH2F2 and CH2Cl2 were studied using the ab initio method. The frequencies, geometries and energies of all species are calculated. The best estimates of the heat of reactions are 30.92 KJ/mol and 13.01 KJ/mol, and, the best potential barrier heights for both reactions are calculated to be 74.50 KJ/mol and 67.22 KJ/mol, respectively. the second-order rate coefficients calculated are 2.8721x10(-21) and 4.2522x10(-20) cm(3)/molecule-s at 298 K, respectively.
