检索结果-南通市图书馆

Chinese Journal of Chemistry 2019年第8期37卷 807-810页

作者： Yizhao Ouyang Miao Zhan Jing Zhou Jiao Jiao Hao HU yoichi M.A.yamada Pengfei Li Frontier Institute of Science and Technology Xi'an Jiaotong UniversityXi'anShaanxi 710054China Department of Applied Chemistry School of ScienceXi'an Jiaotong UniversityXi'anShaanxi 710049China Xi'an Key Laboratory of Sustainable Energy Materials Chemistry Xi'an Jiaotong UniversityXi'anShaanxi 710049China RIKEN Center for Sustainable Resource Science WakoSaitama 3510198Japan

Summary of main observation and conclusion A rigid C2-symmetric chiral bipyridine ligand Z-bpy with a triptycene-like backbone was designed and synthesized from simple chemicals in a scalable *** this new ligand,copper(Ⅰ) catalyzed cyclopropanation of styrenes with commercial ethyl diazoacetate produced various corresponding cyclopropanes in high yields,diastereoselectivity and enantioselectivity up to 97% ee.

关键词： Its was

Spectroscopic Study of the Late B-type Eclipsing Binary System AR Aurigae A and B:Towards Clarifying the Differences in Atmospheric Parameters and Chemical Abundances

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Research in Astronomy and Astrophysics 2025年第2期25卷 162-174页

作者： yoichi Takeda 11-2 Enomachi Naka-ku Hiroshima-shi 730-0851 Japan

AR Aur A+B is a close binary of astrophysical interest because dissimilar surface compositions are reported between similar late B-type dwarfs. A new spectroscopic study on this system was carried out based on the disentangled spectra, in order to determine their atmospheric parameters and elemental abundances. The effective temperature and microturbulence（determined from the equivalent widths of Fe II lines） turned out to be(11,150 K,0.9 km s-1) and(10,650 K, 0.1 km s-1) for A and B, respectively. The chemical abundances of 28 elements were then derived while taking into account the non-LTE effect for Z ≤ 15 elements（Z: atomic number）. The following trends were elucidated for [X/H]（abundance of X relative to the Sun）:（1） Qualitatively, [X/H] shows a rough global tendency to increase with Z, with the gradient steeper for A than for B.（2） However, considerable dispersion is involved for A, since prominently large peculiarities are seen in specific elements reflecting the characteristics of HgMn stars（e.g., very deficient N, Al, Sc, Ni; markedly overabundant P, Mn）.（3） In contrast, the Z-dependence of[X/H] for B tends to be nearly linear with only a small dispersion. These observational facts may serve as a key to understanding the critical condition for the emergence of the chemical anomaly.

关键词： (stars:) binaries: spectroscopic stars: abundances stars: atmospheres stars: chemically peculiar stars: early-type stars: individual (AR Aur)

A novel over-sampling method and its application to miRNA prediction

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Biomedical Science and Engineering 2013年第2期6卷 236-248页

作者： Xuan Tho Dang Osamu Hirose Thammakorn Saethang Vu Anh Tran Lan Anh T. Nguyen Tu Kien T. Le Mamoru Kubo yoichi yamada Kenji Satou Graduate School of Natural Science and Technology Kanazawa University Kanazawa Japan Institute of Science and Engineering Kanazawa University Kanazawa Japan

MicroRNAs (miRNAs) are short (~22nt) non-coding RNAs that play an indispensable role in gene regulation of many biological processes. Most of current computational, comparative, and non-comparative methods commonly classify human precursor micro- RNA (pre-miRNA) hairpins from both genome pseudo hairpins and other non-coding RNAs (ncRNAs). Although there were a few approaches achieving promising results in applying class imbalance learning methods, this issue has still not solved completely and successfully yet by the existing methods because of imbalanced class distribution in the datasets. For example, SMOTE is a famous and general over-sampling method addressing this problem, however in some cases it cannot improve or sometimes reduces classification performance. Therefore, we developed a novel over-sampling method named incre-mental- SMOTE to distinguish human pre-miRNA hairpins from both genome pseudo hairpins and other ncRNAs. Experimental results on pre-miRNA datasets from Batuwita et al. showed that our method achieved better Sensitivity and G-mean than the control (no over- sampling), SMOTE, and several successsors of modified SMOTE including safe-level-SMOTE and border-line-SMOTE. In addition, we also applied the novel method to five imbalanced benchmark datasets from UCI Machine Learning Repository and achieved improvements in Sensitivity and G-mean. These results suggest that our method outperforms SMOTE and several successors of it in various biomedical classification problems including miRNA classification.

关键词： Imbalanced Dataset Over-Sampling SMOTE miRNA Classification

可注射组织工程植骨材料用于牙槽嵴增高并同期种植的临床报告

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

中国口腔医学继续教育杂志 2006年第2期9卷 44-48页

作者： Minoru Ueda yoichi yamada Ryotaro Ozawa Yasuhiro Okazaki 王莺（译）林野（校）不详北京大学口腔医学院北京海淀区中关村南大街22号100081

本临床研究通过使用4种植骨材料（组织工程学植骨材料、问叶干细胞、富血小板血浆、β-三羧基磷酸盐）用于6例牙槽突高度低于3-5mm病例，进行上颌窦底提升或者上置法植骨，评价其临床效果。Ⅱ期手术时及负重后12个月临床检查，所有20颗... 详细信息

本临床研究通过使用4种植骨材料（组织工程学植骨材料、问叶干细胞、富血小板血浆、β-三羧基磷酸盐）用于6例牙槽突高度低于3-5mm病例，进行上颌窦底提升或者上置法植骨，评价其临床效果。Ⅱ期手术时及负重后12个月临床检查，所有20颗种植体临床稳定度好。比较术前术后x线片，硬组织高度平均增加7．3mm±4．6mm。可注射组织工程植骨材料用于种植具有稳定性和可靠性。

关键词：组织工程学植骨材料临床报告种植体牙槽嵴增高注射富血小板血浆上颌窦底提升上置法植骨

Predicting residue contacts for protein-protein interactions by integration of multiple information

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Biomedical Science and Engineering 2014年第1期7卷 28-37页

作者： Tu Kien T. Le Osamu Hirose Vu Anh Tran Thammakorn Saethang Lan Anh T. Nguyen Xuan Tho Dang Duc Luu Ngo Mamoru Kubo yoichi yamada Kenji Satou Graduate School of Natural Science and Technology Kanazawa University Kanazawa Japan Institute of Science and Engineering Kanazawa University Kanazawa Japan

Detailed knowledge of interfacial region between interacting proteins is not only helpful in annotating function for proteins, but also very important for structure-based drug design and disease treatment. However, this is one of the most difficult tasks and current methods are constrained by some factors. In this study, we developed a new method to predict residue-residue contacts of two interacting protein domains by integrating information about evolutionary couplings andamino acid pairwise contact potentials, as well as domain-domain interaction interfaces. The experimental results showed that our proposed method outperformed the previous method with the same datasets. Moreover, the method promises an improvement in the source of template-based protein docking.

关键词： Residue-Residue Contacts Domain-Domain Interactions Protein-Protein Interactions Domain Interfaces Residue Co-Evolution Contact Potentials

D-IMPACT: A Data Preprocessing Algorithm to Improve the Performance of Clustering

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Software Engineering and Applications 2014年第8期7卷 639-654页

作者： Vu Anh Tran Osamu Hirose Thammakorn Saethang Lan Anh T. Nguyen Xuan Tho Dang Tu Kien T. Le Duc Luu Ngo Gavrilov Sergey Mamoru Kubo yoichi yamada Kenji Satou Graduate School of Natural Science and Technology Kanazawa University Kanazawa Japan Institute of Science and Engineering Kanazawa University Kanazawa Japan

In this study, we propose a data preprocessing algorithm called D-IMPACT inspired by the IMPACT clustering algorithm. D-IMPACT iteratively moves data points based on attraction and density to detect and remove noise and outliers, and separate clusters. Our experimental results on two-dimensional datasets and practical datasets show that this algorithm can produce new datasets such that the performance of the clustering algorithm is improved.

关键词： Attraction Clustering Data Preprocessing Density Shrinking

Predicting Βeta-Turns and Βeta-Turn Types Using a Novel Over-Sampling Approach

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Biomedical Science and Engineering 2014年第11期7卷 927-940页

作者： Lan Anh T. Nguyen Xuan Tho Dang Tu Kien T. Le Thammakorn Saethang Vu Anh Tran Duc Luu Ngo Sergey Gavrilov Ngoc Giang Nguyen Mamoru Kubo yoichi yamada Kenji Satou Graduate School of Natural Science and Technology Kanazawa University Kanazawa Japan Department of Computer Science Hue University of Education Hue Vietnam Institute of Science and Engineering Kanazawa University Kanazawa Japan

β-turn is one of the most important reverse turns because of its role in protein folding. Many computational methods have been studied for predicting β-turns and β-turn types. However, due to the imbalanced dataset, the performance is still inadequate. In this study, we proposed a novel over-sampling technique FOST to deal with the class-imbalance problem. Experimental results on three standard benchmark datasets showed that our method is comparable with state-of-the-art methods. In addition, we applied our algorithm to five benchmark datasets from UCI Machine Learning Repository and achieved significant improvement in G-mean and Sensitivity. It means that our method is also effective for various imbalanced data other than β-turns and β-turn types.

关键词： Beta-Turns Beta-Turn Types Class-Imbalance Over-Sampling

Spectroscopic Determination of C,N,and O Abundances of Solar-analog Stars Based on the Lines of Hydride Molecules

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Research in Astronomy and Astrophysics 2023年第2期23卷 107-120页

作者： yoichi Takeda 11-2 Enomachi Naka-kuHiroshima-shi730-0851Japan

Photospheric C,N,and O abundances of 118 solar-analog stars were determined by applying the synthetic-fitting analysis to their spectra in the blue or near-UV region comprising lines of CH,NH,and OH molecules,with an aim of clarifying the behaviors of these abundances in comparison with[Fe/H].It turned out that,in the range of-0.6■[Fe/H]■+0.3,[C/Fe]shows a marginally increasing tendency with decreasing[Fe/H]with a slight upturn around[Fe/H]~0,[N/Fe]tends to somewhat decrease toward lower[Fe/H],and[O/Fe]systematically increases (and thus[C/O]decreases) with a decrease in[Fe/H].While these results are qualitatively consistent with previous determinations mostly based on atomic lines,the distribution centers of these[C/Fe],[N/Fe],and[O/Fe]at the near-solar metallicity are slightly negative by several hundredths of dex,which is interpreted as due to unusual solar abundances possibly related to the planetary formation of our solar ***,clear anomalies are not observed in the[C,N,O/Fe]ratios of planet-host *** out of four very Be-deficient stars were found to show anomalous[C/Fe]or[N/Fe]which may be due to mass transfer from the evolved companion,though its relation to the Be depletion mechanism is still unclear.

关键词： Galaxy evolution-planet-star interactions-stars abundances-stars atmospheres-stars solar-type

维普期刊数据库

Measurements of the Ca II infrared triplet lines of young stellar objects

在线全文

学校读者我要写书评

暂无评论

Research in Astronomy and Astrophysics 2013年第10期13卷 1189-1201页

作者： yoichi Itoh Keiko Moto'oka yoichi Itoh The Saga Prefecture Space & Science Museum 16351 Nagashima Takeo Takeo Saga 843-0021 Japan Nishi-Harima Astronomical Observatory Center for Astronomy University of Hyogo 407-2 Nishigaichi Sayo Hyogo 679-5313 Japan yitoh @nhao.jp

Equivalent widths and line widths of Ca II infrared triplet emission lines were measured in the high-resolution optical spectra of 39 young stellar *** found that the equivalent widths of the emission lines decrease with stellar *** has often been claimed that strong chromospheric activity is generated by a dynamo process caused by fast rotation of the ***,we found no clear correlation between the strength of the Ca II lines and the stellar rotation ***,we found that the objects with high mass accretion rates had stronger Ca II emission *** correlation supports the turbulent chromosphere model or the magnetic accretion theory for classical T Tauri *** also noticed that the equivalent widths of Ca II lines in transitional disk objects are one-tenth of those in classical T Tauri stars,even if the masses of the circumstellar disks are comparable.

关键词： stars:pre-main sequence stars:emission lines

维普期刊数据库

Degradation behaviors of nonylphenol ethoxylates by isolated bacteria using improved isolation method

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2008年第9期20卷 1025-1027页

作者： Hideyuki Tamaki yoichi Kamagata Institute for Biological Resources and Functions National Institute of Advanced Industrial Science and Technology

Nonylphenol ethoxylate (NPEO)-degrading bacteria were isolated from activated sludge using an improved isolation method, and the corresponding degradation behaviours were investigated. Eight NPEO-degrading strains distributed in genera Pseudomonas, Sphingomonas, Sphingobium, Cupriavidus, Ralstonia, Achromobacter, and Staphylococcus were acquired. The latter five genera have never been reported for the degradation of NPEOs. Four degradation patterns were observed for the eight pure strains. In pattern A, NPE...

关键词： nonylphenol ethoxylate (NPEO) biodegradation ssolation method

维普期刊数据库