检索结果-南通市图书馆

The coronal hole properties in microwave emission.

在线全文

学校读者我要写书评

暂无评论

The coronal hole properties in microwave emission.

Phosphonated USY,a promising catalyst for the development of environmentally benign biodiesel(methyl acetate) process

第十一届全国日地空间物理学术讨论会

作者： v.P.Maksimov D.v. Prosovetsky v.v.Grechnev B.B.Krissinel S.M.Kuznetsoval A.G. Obukhov K.Shibasaki Institute of Solar-Terrestrial Physics Irkutsk Russia Institute of Solar-Terrestrial Physics Irkutsk Russia Institute of Solar-Terrestrial Physics Irkutsk Russia Institute of Solar-Terrestrial Physics Irkutsk Russia Institute of Solar-Terrestrial Physics Irkutsk Russia Institute of Solar-Terrestrial Physics Irkutsk Russia Nobeyama Radio Observatory Japan

＜正＞Coronal holes, areas of open magnetic field lines are account for high-speed streams of a solar wind that may cause both recursion and non-recursion geomagnetic storms. There is no a complete understanding of solar wind acceleration processes and a heat transport problem in coronal holes connected with. For the solution of these problems the data about structure, physical properties of coronal holes, and their tem-poral changes are required. In our contribution the results of the coronal hole investi-gation at medium and short microwave wavelengths using the Siberian solar radio telescope （SSRT） and Nobeyama radioheliograph （NoRH） observations are presented. It is shown, that coronal hole contrast relative to the quiet Sun level at 5.2 cm wave-length allows judging about an electron density and temperature within the coronal hole. Using simultaneous observations by SSRT and NoRH we found out the coronal hole structural features in which a heat transport is mainly carried out by Alfven waves.

关键词：

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2015年第3期24卷 285-290页

作者： Kakasaheb Y.Nandiwale Gahana Gopal.C vijay v.Bokade Catalysis and Inorganic Chemistry Division CSIR National Chemical Laboratory

The present study focuses on the evaluation of the potential applicability of Ultra Stable Y（USY） and phosphonated USY（1 wt%-4 wt%phosphorous loading） as heterogeneous catalysts for biodiesel（methyl acetate） *** synthesized catalysts were characterized by powder X-ray diffraction（XRD）,Brunaer-Emmett-Teller（BET） surface area,total acidity by temperature-programmed desorption of ammonia（TPD-NH3） and Fourier Transform Infrared（FTIR） *** performances of catalysts were evaluated for the transesterification of butyl acetate with methanol（a model reaction in biodiesel production）.In view to obtain a maximum yield of methyl acetate,the optimization of process parameters such as reactant molar ratio,catalyst loading,reaction temperature and reaction time was *** the phosphonated USY catalysts showed higher catalytic activity than the parent USY,which can be attributed to the increase of total acidity due to phosphonation.2 wt% P/USY（2% phosphorous loaded on USY） exhibited 92% methyl acetate yield with 100% selectivity,which was proved to be a potential catalyst for biodiesel *** invented catalyst was found to be stable and reusable for five catalytic cycles,demonstrating that it might be a environmentally benign catalytic process.

关键词： transesterification phosphonated USY methyl acetate biodiesel

Increase in Probability of the Correct Forecast of Tsunami Formation

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Science and Engineering 2011年第6期5卷 716-719页

作者： v.I. Korochentsev E.v. Lisunov P.P. Sherbakov Far East Federal University Vladivostok Primorsky Region 690990 Russia

The presented paper exhibits theory of the ＂gravitational＂ waves propagation near the Earth surface and in the ocean. There was determined an expression ＂gravitational＂ wave which was registered by the gravimeters being placed in several points of the Earth globe. Alteration of gravitational field was accompanied by alteration of the ＂gravitational＂ wave which has the velocity differing from the velocity of seismic waves. The theoretical model was proved by many experiments realized under registration of the underwater earthquake core by tens of gravimeters being placed in the Earth globe different points. The ＂gravitational＂ waves assist to increase the right forecast probability of the beginning tsunami to 50%.

关键词： Tsunami earthquake gravitational waves tsunami forecast.

Investigating the Synthesis of RBF Networks

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

Journal of Systems Engineering and Electronics 1996年第3期7卷 25-29页

作者： v. David Sanchez A.(German Aerospace Research Establishment, DLR OberpfaffenhofenInstitute for Robottes and System DynamicsD-82230 Wessling, Germany) German Aerospace Research Establishment DLR Oberpfaffenhofen Institute for Robotics and System Dynamics D-82230 Wessling Germany

The approximation capability of RBF networks is investigated using a test function and a fixed finite number of training data. The test function used allows to confirm the recently introducedconcept of second derivative dependent placement of RBF centers. Different Gaussian RBF networksare trained varying the width and the number of centers (number of hidden units). The dependenceof the approximation error on these network parameters is studied experimentally.

关键词： Approximation error Function approximation Neural network synthesis Number of hidden units Radial basis functions.

在线全文

学校读者我要写书评

暂无评论

四唑类化合物的合成及应用研究新进展

有机化学 2013年第2期33卷 224-244页

作者：代玲玲崔胜峰 Guri L.v.Damu 周成合西南大学化学化工学院重庆400715 Postdoctoral fellow from Indian Institute of Chemical Technology(IICT) Hyderabad-500 607India

四唑是一种重要的五元芳杂环,具有多氮富电子的平面结构特征.这种特殊的结构使得四唑类化合物作为药物、炸药、功能材料等在医学、农学、材料科学等众多领域具有广泛的应用前景.相关研究十分活跃,已取得了许多重要进展.结合作者唑类方... 详细信息

四唑是一种重要的五元芳杂环,具有多氮富电子的平面结构特征.这种特殊的结构使得四唑类化合物作为药物、炸药、功能材料等在医学、农学、材料科学等众多领域具有广泛的应用前景.相关研究十分活跃,已取得了许多重要进展.结合作者唑类方面的研究,参考国内外近五年文献,系统地综述了四唑类化合物的合成及其在医药、农药、材料等领域的应用研究新近况.

关键词：四唑抗高血压抗菌抗病毒除草剂含能材料催化剂

Green synthesis of pure and doped semiconductor nanoparticles of ZnS and CdS

在线全文

学校读者我要写书评

暂无评论

Transactions of Nonferrous Metals Society of China 2015年第10期25卷 3265-3270页

作者： K.MURALEEDHARAN vijisha K.RAJAN v.M.ABDUL MUJEEB Department of Chemistry University of Calicut

Nanoparticles of pure and Cu/Ag-doped CdS and ZnS have been synthesized via chemical bath deposition without using any capping or toxic *** synthesis was carried out through a simple and less expensive green *** XRD result shows that both pure CdS and ZnS and their doped derivatives are of high crystalline with hexagonal packing *** average crystalline size of all nanoparticles was calculated using Debye-Scherrer *** crystalline size of nanoparticles of pure samples varied with that of the doped *** average crystalline sizes of all nanoparticles are found to be in the range of 5.5-2.2 nm for CdS（from pure to doped） and 4.3-3.4 nm for ZnS,*** band gap values obtained from Uv-visible spectra are in the range of 3.5-2.1 e v for CdS and 3.3-2.7 e v for ZnS derivatives,*** FTIR spectral data give characteristic peaks for Cd—S,Cu—S,Ag—S and Zn—S bonds and confirm the formation of respective *** peaks corresponding to the microstructural formation are also *** FE-SEM images show the granular morphological structure for all the *** agglomeration size of the samples in the range of 10-50 nm for CdS：Cu and 50-100 nm for ZnS：Cu is observed.

关键词： chalcogenide ZnS CdS nanostructure semiconductor green synthesis catalytic properties

Exploring the bioactive potential of Serriatia marcescens vITAPI （Acc： 1933637） isolated from soil

在线全文

学校读者我要写书评

暂无评论

Frontiers in Biology 2016年第6期11卷 476-480页

作者： Aruna Muthukumar Pallavi Pradeep Isha Thigale Mohanasrinivasan v. Jemimah Naine S. C. Subathra Devi School of Bio Sciences and Technology VIT University Vellore Tamil Nadu lndia

BACKGROUND： Serratia is one of the most important groups of bacteria which produces proteolytic enzymes effectively and known to possess anti-inflammatory properties. The main focus of the current study was to extract the enzyme serratiopeptidase and pigment prodigiosin from Serratia mascescens. Prodigiosin is a red colored pigment produced by the bacterium Serratia marcescens. It is emerging as a valuable molecule because of its large applications. It has already been proved that pigmented strain of Serratia marcescens is less virulent than non-pigmented strains. Moreover the strain we have obtained is from farm soil which indicates that prodigiosin production can be carded safely using this strain. METHODS： In the present study, the isolate vITASP strain was confirmed by morphological, biochemical and molecular studies. The enzyme and pigment were analyzed for anti-oxidant, anti-inflammatory and cytotoxic properties. RESULTS： The isolate was further confirmed and identified as Serratia marcescens with 99% similarity. The extracted pigment showed potent radical scavenging effect with 86% and the enzyme was found to inhibit 83%, which was significant in comparison to ascorbic acid standard. The in vitro anti-inflammatory effect of pigment in controlled experimental conditions revealed its protection at 88% and the enzyme with 90%. Aspirin was used as the reference drug. The present findings exhibited a concentration dependent inhibition. The cytotoxic bioassay of pigment showed the IC5o value as （50） ~tg/mL with 63% cytotoxicity which was statistically significant compared to positive control. CONCLUSIONS： Therefore, it appears to be an essential remedial and application research. It may turn out to be highly beneficial to mankind in solving many problems associated with human health.

关键词： Serratia mascescens prodigiosin serratiopeptidase bioactivity

水合物地层低温钻井液对井底岩石表层强度影响

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

中国石油大学学报（自然科学版） 2015年第4期39卷 147-153页

作者：刘天乐蒋国盛宁伏龙张凌 CHIXOTKIN v F 王韧王瑜岩土钻掘与防护教育部工程中心湖北武汉430074 中国地质大学工程学院湖北武汉430074 中国地质大学工程技术学院北京100083

由于天然气水合物仅在高压低温条件下稳定存在,为了保持水合物稳定,在钻井过程中宜采用低温钻井液,而在低温条件下钻井液能否对井底岩石表层起到软化作用,对于提高机械钻速具有重要意义。在分析钻井液对井底岩石表层软化作用机制的基础... 详细信息

由于天然气水合物仅在高压低温条件下稳定存在,为了保持水合物稳定,在钻井过程中宜采用低温钻井液,而在低温条件下钻井液能否对井底岩石表层起到软化作用,对于提高机械钻速具有重要意义。在分析钻井液对井底岩石表层软化作用机制的基础上,较系统地建立低温钻井液软化井底岩石表层定量评价方法,以清水为对比浆液,通过试验将6种水合物地层模拟钻井液(分别含有质量分数为0.1%的表面活性剂和有机盐处理剂)在低温条件下对薄片砂岩试样的软化效果进行对比。结果表明:相比于两种有机盐处理剂,含表面活性剂的4种模拟钻井液在低温条件下对岩样软化效果更好,有利于提高岩石破碎效率和机械钻速;4种含表面活性剂钻井液中,含十二烷基硫酸钠(SDS)钻井液对岩样的软化效果最好。

关键词：天然气水合物地层低温钻井液岩石表层强度砂岩试样软化

Application of DSPs in Data Acquisition Systems for Neutron Scattering Experiments at the IBR-2 Pulsed Reactor

在线全文

学校读者我要写书评

暂无评论

Application of DSPs in Data Acquisition Systems for Neutron ...