检索结果-南通市图书馆

Synthesis, Crystal Structure and Insecticidal Activities of Novel Neonicotinoid Derivatives

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chemical Research in Chinese Universities 2010年第3期26卷 380-383页

作者： ZHAO Yu WANG Gang li Yong-qiang WANG Su-hua li zheng-ming State Key Laboratory of Elemento-Organic Chemistry Research Institute of Elemento-Organic Chemistry National Pesticide Engineering Research Center（Tianjin） Nankai University Tianjin 300071 P. R. China

Ten new N-oxalyl derivatives of neonicotinoid compound were designed and synthesized. Their structures were confirmed by ^1H NMR spectra, elemental analysis and X-ray diffraction. The preliminary insecticidal activities of the new compounds were evaluated. The results of bioassays indicate that the title Compounds exhibit moderate insecticidal activities. Surprisingly, the insecticidal activity of compound 7b against bean aphids at 200 mg/kg is 100%, which is comoarable to that of the commercialized imidacloprid.

关键词： Neonicotinoid N-Oxalyl derivative Insecticidal activity Bean aphid Imidacloprid

Synthesis and Herbicidal Activity of Novel Sulfonylureas Containing Thiadiazol Moiety

在线全文

学校读者我要写书评

暂无评论

Chemical Research in Chinese Universities 2008年第1期24卷 32-35页

作者： GUO Wan-cheng liU Xing-hai li Yong-hong WANG Su-hua li zheng-ming Institute of Elemento-Organic Chemistry State Key Laboratory of Elemento-Organic Chemistry Nankai University Tianjin 300071 P. R. China

Thirteen novel sulfonylureas containing thiadiazole moiety were synthesized in a two-step reaction. Their structures were determined using IR, ^1H NMR, HRFTMS, and elemental analysis. Herbicidal activities of these compounds were determined in the green house bio-assay. The results show that four compounds among them exhibit some activity toward four tested herbs.

关键词： Sulfonylurea Synthesis Herbicidal activity

Data Mining Ontology Development for High User Usability

在线全文

学校读者我要写书评

暂无评论

Wuhan University Journal of Natural Sciences 2006年第1期11卷 51-56页

作者： li Yu-hua LU zheng-ding SUN Xiao-lin WEN Kun-mei li Rui-xuan College of Computer Science and Technology Huazhong University of Science and Technology Wuhan 430074Hubei China

This paper mainly introduces the development and implementation of the user centered data mining service ontology on Universal Knowledge Grid （UKG）. UKG is an ontology-based grid architecture model to build large-scale distributed knowledge discovery system on the grid. The data mining ontology services are the main service offering by UKG. It can meet the user requirements of knowledge discovery in different domains and different hierarchies and make the system exoteric, extensible and high usable. A data min- ing solution for money laundering is introduced.

关键词： data mining ontology usability universal knowledge grid

Syntheses, Structures, Electrochemistry and Magnetic Properties of Two Trinuclear Cyanide-bridged Clusters Based on Tricyanometalate Building Block

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Structural Chemistry 2019年第2期38卷 273-283,168页

作者： WANG An-Ping DONG Da-Peng ZHAO Hai-Yan YU Nai-Sen li zheng-hua School of Physics and Materials Engineering Dalian Minzu University

The reaction of tricyanometallate precursor, Bu_4N[Fe(Tp)(CN)_3] and(Bu_4N)[(pzTp)Fe(CN)_3](Tp = tris(pyrazolyl)hydroborate, pzTp = tetrakis(pyrazolyl)borate) with Ni(ClO_4).26 H_2O in the presence of the monodentate N-methylimidazole ligand afforded two new cyano-bridged heterobimetallic {Fe2 Ni} trinuclear clusters, {[Fe(Tp)(CN)_3]_2[Ni(Mim)_4]}·8 H_2O(1) and {[Fe(pzTp)(CN)_3]_2[Ni(Mim)_4]}·2 CH_3OH·2H_2O(2). The molecular structure was determined by single-crystal X-ray diffraction. In the two compounds, the FeIII ions were coordinated by three cyanide carbon atoms and three nitrogen atoms of Tp(or pzTp) anions, whereas, the NiII ions were surrounded by two cyanide nitrogen atoms and four nitrogen atoms from four monodentate N-methylimidazole ligands, and they were bridged by tricyanometalate building block to form similar {Fe2Ni} trinuclear clusters. Cyclic voltammetry(CV) measurements indicated that compound 1 exhibited two quasireversible iron-centered reduction processes at –0.71 and –0.17 V and one quasireversible nickel-centered oxidation process at 0.92 V, while compound 2 showed two quasireversible iron-centered reduction processes at –0.66 and –0.09 V and one quasireversible nickel-centered oxidation process at 0.88 V. Magnetic measurements showed that compounds 1 and 2 exhibited strong intrachain ferromagnetic interaction between the low-spin Fe~Ⅲ(S = 1/2) and high-spin Ni~Ⅱ(S = 1) ions.

关键词： crystal structure cyanide ferromagnetic coupling nickel(Ⅱ)

在线全文

学校读者我要写书评

暂无评论

交变力磁力显微镜动态成像技术的研究

物理学报 2014年第17期63卷 382-390页

作者：李正华李翔大连民族学院物理与材料工程学院大连116600 上海理工大学材料科学与工程学院上海200093

近年来磁力显微镜(magnetic force microscopy,MFM)对动态磁场信号的测量与分析由于其特殊的工业要求和重要用途而受到广泛关注,本文旨在利用交变磁力对磁性探针的周期性调制发展一种交变力磁力显微镜技术,为磁信息存储工业等重要领域... 详细信息

近年来磁力显微镜(magnetic force microscopy,MFM)对动态磁场信号的测量与分析由于其特殊的工业要求和重要用途而受到广泛关注,本文旨在利用交变磁力对磁性探针的周期性调制发展一种交变力磁力显微镜技术,为磁信息存储工业等重要领域关键技术的发展提供新型的有力的工具.与目前标准MFM采用的设计思路不同,本文的关键在于合理利用MFM频率调制机理,优化设计MFM磁性探针,并且引入动态信号处理模块,实现对交变磁场信号的MFM成像.为达到这些目的,需要从理论上研究MFM探针的频率调制机理,并由实验上设计出动态信号提取模块,二者相辅结合优化设计出具有动态信号测试和分析能力的交变力磁力显微镜技术,由此来测量和解释纳米尺度磁畴结构.

关键词：磁力显微镜纳米磁畴动态磁性频率调制

L1_0-FePt合金单层磁性薄膜的微磁学模拟

在线全文

学校读者我要写书评

暂无评论

物理学报 2014年第16期63卷 360-366页

作者：李正华李翔大连民族学院物理材料与工程学院大连116600 上海理工大学材料科学与工程学院上海200093

具有四方结构的L10-FePt合金因其具有高磁晶各向异性和良好的化学稳定性而成为超高密度薄膜磁记录介质的最佳选择.对实验制备得到的磁性能良好的垂直取向L10-FePt合金单层膜进行了微磁学分析.在传统微磁学模型的基础上,根据晶体的对称性... 详细信息

具有四方结构的L10-FePt合金因其具有高磁晶各向异性和良好的化学稳定性而成为超高密度薄膜磁记录介质的最佳选择.对实验制备得到的磁性能良好的垂直取向L10-FePt合金单层膜进行了微磁学分析.在传统微磁学模型的基础上,根据晶体的对称性,引入了四角磁晶各向异性能密度的唯象表达形式;又依据薄膜生长过程中晶格对称性的破坏,考虑了薄膜面内的应力,并引入了磁弹性能.以四角磁晶各向异性能和磁弹性能为重点,对L10-FePt合金单层膜的磁滞回线进行了详细的分析,并且用微磁学方法确定了薄膜面内应力的大小.

关键词：磁记录微磁学磁滞回线磁致伸缩

PRSS50-mediated inhibition of MKP3/ERK signaling is crucial for meiotic progression and sperm quality

在线全文

学校读者我要写书评

暂无评论

Zoological Research 2024年第5期45卷 1037-1047页

作者： Chun-Xue Niu Jia-Wei li Xiao-li li lin-lin Zhang Yan Lang Zhen-Bo Song Chun-Lei Yu Xiao-Guang Yang Hai-Feng Zhao Jia-ling Sun li-hua zheng Xue Wang Ying Sun Xiao-Hong Han Guan-Nan Wang Yong-li Bao National Engineering Laboratory for Druggable Gene and Protein Screening Northeast Normal UniversityChangchunJilin 130117China China International Joint Research Center for Human Stem Cell Bank Northeast Normal UniversityChangchunJilin 130117China Jilin Institute for Drug Control ChangchunJilin 130022China

Serine protease 50(PRSS50/TSP50)is highly expressed in *** study investigated its role in testicular development and ***,PRSS50 knockdown was observed to impair DNA synthesis in *** further explore this,we generated PRSS50 knockout(Prss50^(−/−))mice(Mus musculus),which exhibited abnormal spermatid nuclear compression and reduced male ***,dysplastic seminiferous tubules and decreased sex hormones were observed in 4-week-old Prss50^(−/−)mice,accompanied by meiotic progression defects and increased apoptosis of spermatogenic *** analysis indicated that PRSS50 deletion resulted in increased phosphorylation of extracellular signal-regulated protein kinases 1 and 2(ERK1/2)and elevated levels of MAP kinase phosphatase 3(MKP3),a specific ERK antagonist,potentially accounting for testicular dysplasia in adolescent Prss50−/−*** together,these findings suggest that PRSS50 plays an important role in testicular development and spermatogenesis,with the MKP3/ERK signaling pathway playing a significant role in this process.

关键词： PRSS50(TSP50) Meiotic progression Sperm quality MKP3 ERK

Relationship between symptoms and weight-bearing radiographic parameters of idiopathic flexible flatfoot in children

在线全文

学校读者我要写书评

暂无评论

Chinese Medical Journal 2013年第11期126卷 2029-2033页

作者： YAN Gui-sen YANG zheng LU Ming ZHANG Jian-li ZHU zheng-hua GUO Yuan Department of Pediatric Orthopaedics Beijing Jishuitan Hospitalthe Fourth Clinical Medical College of Peking University Beijing100035 China

Background Idiopathic flexible flatfoot in children most frequently improves with age and remains asymptomatic. It is a physiological variation of the normality that does not require treatment unless it becomes symptomatic. The aim of this research was to investigate the reason why some individuals with flexible flatfoot become symptomatic by analysis of the differences in the relative alignment of each segment of the foot between symptomatic and asymptomatic patients with idiopathic flexible flatfoot using radiographic measurements. Methods One hundred patients with idiopathic flexible flatfoot were retrospectively identified and divided into two groups： asymptomatic （n=50） and symptomatic （n=50）. Standing anteroposterior and lateral radiographs of the foot were analyzed. Five measurements were calculated to describe the alignment of the foot. An independent-samples t-test and Logistic regression test were used for statistical analysis. Results Age and sex were similar in the two groups. The independent-samples test revealed significant differences in two parameters： the anteroposterior talonavicular coverage angle and the lateral talo-first metatarsal angle. When the Logistic regression test was performed, only the talonavicular coverage angle showed statistical significance. Conclusions The lateral displacement of the navicular bone, measured by the anteroposterior talonavicular coverage angle, seems to be related to the onset of symptoms. In individuals with otherwise normal flexible flatfoot, an increase in this angle might be an important risk factor for developing symptoms.

关键词： flexible flatfoot radiographic analysis symptomatic flatfoot children

A Dynamics Study of a Magnetic Flux Leakage(MFL) Signal and its Application to Defect Location Discrimination in Steel Pipes MFL Testing Equipment

在线全文

学校读者我要写书评

暂无评论

International Journal of Plant Engineering and Management 2009年第2期14卷 70-77页

作者： KANG Yi-hua li Jiu-zheng WU Xin-jun School of Mechanical Science and Engineering Huazhong University of Science and Technology Wuhan 430074 China

Difference processing was used to the direct current magnetic flux leakage （DC-MFL） signal, emanating from the defects machined artificially on the internal and external surfaces of a steel pipe. Consequently, the loea-tion discriminating index 8 was provided to identify the defect whether it is on the internal surface or the external one. Three characteristics, shape, depth and orientation of the defect, were discussed through a series of experiments on the artificial defects, such as transverse notches, oblique notches and pits on the steel pipe. The approach has been verified effective to address the defect location identifying problem, albeit the limits on the accuracy assessment to those natural defects on steel pipes in service.

关键词： nondestructive testing magnetic flux leakage steel pipes internal defects