检索结果-南通市图书馆

STEP AP 242 Managed Model-based 3D Engineering:An Application Towards the Automation of Fixture Planning

International Journal of Automation and computing 2021年第5期18卷 731-746页

作者： remil george thomas Deepak Lawrence K. Manu R. Department of Mechanical Engineering National Institute of Technology CalicutKerala 673601India

Fixture design and planning is one of the most important manufacturing activities, playing a pivotal role in deciding the lead time for product development. Fixture design, which affects the part-quality in terms of geometric accuracy and surface finish, can be enhanced by using the product manufacturing information(PMI) stored in the neutral standard for the exchange of product model data(STEP) file, thereby integrating design and manufacturing. The present paper proposes a unique fixture design approach, to extract the geometry information from STEP application protocol(AP) 242 files of computer aided design(CAD) models, for providing automatic suggestions of locator positions and clamping surfaces. Automatic feature extraction software "FiXplan", developed using the programming language C#, is used to extract the part feature, dimension and geometry information. The information from the STEP AP 242 file is deduced using geometric reasoning techniques, which in turn is utilized for fixture planning. The developed software is observed to be adept in identifying the primary, secondary, and tertiary locating faces and locator position configurations of prismatic components. Structural analysis of the prismatic part under different locator positions was performed using commercial finite element method software, ABAQUS, and the optimized locator position was identified on the basis of minimum deformation of the *** area-ratio(base locator enclosed area(%)/work piece base area(%)) for the ideal locator configuration was observed as 33%. Experiments were conducted on a prismatic workpiece using a specially designed fixture, for different locator configurations. The surface roughness and waviness of the machined surfaces were analysed using an Alicona non-contact optical profilometer. The best surface characteristics were obtained for the surface machined under the ideal locator positions having an area-ratio of 33%, thus validating the predicted numerical resul

关键词： Standard for the exchange of product model data(STEP)application protocol(AP)242 product manufacturing information computer-aided fixture design computer aided design(CAD)/computer aided manufacturing(CAM) automation computer integrated manufacturing 3D surface roughness

来源：

维普期刊数据库

同方期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Magnets, children and the bowel: A dangerous attraction?

引用

World Journal of Gastroenterology 2012年第38期18卷 5324-5328页

作者： Anil thomas george Sandeep Motiwale Department of Physiology St Mark's Hospital London HA1 3UJ United Kingdom Department of Paediatric Surgery Queen's Medical Center University Hospitals Nottingham NG7 2UH United Kingdom

Reports of magnet ingestion are increasing rapidly globally. However, multiple magnet ingestion, the subsequent potential complications and the importance of the early identification and proper management remain both under-recognized and underestimated. Published literature on such cases could possibly represent only the tip of an iceberg with press reports, web blogs and government documents highlighting further occurrence of many more such incidents. The increasing number of complications worldwide being reported secondary to magnet ingestion point not only to an acute lack of awareness about this condition among the medical profession but also among parents and carers who will be in most cases the first to pick up on magnet ingestion. There still seems to be no consensus on the management of magnet ingestion with several algorithms being proposed for management. Prevention of this condition remains a much better option than cure. Proper education and improved awareness among parents and carers and frontline medical staff is key in addressing this rapidly emerging problem. The goal of managing such cases of suspected magnet ingestion should be aimed at reducing delays between ingestion time, diagnosis time and intervention time.

关键词： Multiple magnet ingestion Children Bowel injury Fistulation Necrosis

来源：

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

Nanoscale chemical segregation to twin interfaces in τ-MnAl-C and resulting effects on the magnetic properties

引用

Journal of Materials Science & Technology 2023年第3期134卷 22-32页

作者： Panpan Zhao Markus Gusenbauer Harald Oezelt Daniel Wolf thomas Gemming thomas Schrefl Kornelius Nielsch thomas george Woodcock Leibniz IFW Dresden Helmholtzstr.20Dresden 01069Germany TU Dresden Institute of Materials ScienceDresden 01062Germany Department for Integrated Sensor Systems Danube University KremsKrems an der Donau 3500Austria

In this study,aberration-corrected scanning transmission electron microscopy coupled with electron energy-loss spectroscopy(STEM-EELS)was used to investigate the atomistic structure and chemical com-position of true twin and order twin boundaries in ferromagneticτ-*** twins and order twins were distinguished based on the diffraction patterns using *** elemental segregation was observed at the coherent true twin boundary but some Mn enrichment within a region of about 1.5-2 nm was found at the incoherent true twin boundary.A transition region with Mn enrichment about 4-6 nm wide was found at the order twin boundary.A carbon cluster with a size of around 5 nm was also found at the twin *** simulations were conducted to study the effect of this chemical seg-regation at twin interfaces on the magnetic *** results showed that the coercivity tends to increase with increasing structural and chemical disorder at the interface.

关键词： τ-MnAl-C Twin boundaries Elemental segregation STEM-EELS Micromagnetic simulations

来源：

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

Origin of Symmetry Breaking and Confinement in Conducting Polymers with Ring Structures

引用

Communications in Theoretical Physics 2007年第2X期48卷 366-368页

作者： YUAN Yuan thomas F. george SUN Xin Research Center for Quantum Manipulation Fudan University Shanghai 200433 China National Lab of Infrared Physics Shanghai 200083 China Office of the Chancellor and Center for Molecular Electronics Departments of Chemistry & Biochemistry and Physics & Astronomy Univ.ersity of Missouri-St. Louis St. Louis Missouri 63121 USA

A model to describe the main features of conjugated polymers with ring structures, such as polythiophene and polypyrrole, is constructed. It is shown that the origin of the symmetry breaking and confinement of a solit... 详细信息

关键词： polymer branch hopping symmetry breaking confinement

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Evaluation of diverse classification approaches for land use/cover mapping in a Mediterranean region utilizing Hyperion data

引用

International Journal of Digital Earth 2014年第3期7卷 194-216页

作者： Alata Elatawneh Chariton Kalaitzidis george P.Petropoulosc thomas Schneider Institute of Forest Management Technische Universität Muünchen(TUM)85354 FreisingGermany Department of Geoinformation in Environmental Management Mediterranean Agronomic Institute of Chania(MAICh)Chania 73100Greece INFOCOSMOS 13341 AthensGreece

Information on Earth’s land surface cover is commonly obtained through digital image analysis of data acquired from remote sensing *** this study,we evaluated the use of diverse classification techniques in discriminating land use/cover types in a typical Mediterranean setting using Hyperion *** this purpose,the spectral angle mapper(SAM),the object-based and the non-linear spectral unmixing based on artificial neural networks(ANNs)techniques were applied.A further objective had been to investigate the effect of two approaches for training sites selection in the SAM classification,namely of the pixel purity index(PPI)and of the direct selection of training points from the Hyperion imagery assisted by a QuickBird imagery and field-based training *** classification outperformed the other techniques with an overall accuracy of 83%.Sub-pixel classification based on the ANN showed an overall accuracy of 52%,very close to that of SAM(48%).SAM applied using the training sites selected directly from the Hyperion imagery supported by the QuickBird image and the field visits returned an increase accuracy by 16%.Yet,all techniques appeared to suffer from the relatively low spatial resolution of the Hyperion imagery,which affected the spectral separation among the land use/cover classes.

关键词： Hyperion Earth’s land use/cover mapping digital image analysis spectral angle mapper sub-pixel classification artificial neural networks Greece

来源：

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

Extracting local nucleation fields in permanent magnets using machine learning

引用

npj Computational Materials 2020年第1期6卷 924-933页

作者： Markus Gusenbauer Harald Oezelt Johann Fischbacher Alexander Kovacs Panpan Zhao thomas george Woodcock thomas Schrefl Department for Integrated Sensor Systems Danube University KremsKrems an der DonauAustria Institute for Metallic Materials Leibniz IFW DresdenDresdenGermany

Microstructural features play an important role in the quality of permanent *** coercivity is greatly influenced by crystallographic defects,like twin boundaries,as is well known for *** would be very useful to be able to predict the macroscopic coercivity from microstructure *** this is not possible now,in the present work we examine a related question,namely the prediction of simulated nucleation fields of a quasi-three-dimensional(rescaled and extruded)system constructed from a two-dimensional image.

关键词： microstructure permanent magnets

来源：

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

Prospects for discriminating Zingiberaceae species in India using DNA barcodes

引用

Journal of Integrative Plant Biology 2014年第8期56卷 760-773页

作者： Meenakshi Ramaswamy Vinitha Unnikrishnan Suresh Kumar Kizhakkethil Aishwarya Mamiyil Sabu george thomas Plant Molecular Biology Rajiv Gandhi Centre for BiotechnologyThiruvananthapuram Kerala 695014 India Regional Facility for DNA Fingerprinting Rajiv Gandhi Centre for BiotechnologyThiruvananthapuram Kerala 695014 India Department of Botany University of Calicut

We evaluated nine plastid （matK, rbcL, rpoCl, rpoB, rp136-rpsS, ndhJ, trnL-F, tmrnH-psbA, accD） and two nuclear （ITS and ITS2） barcode loci in family Zingiberaceae by analyzing 60 accessions of 20 species belonging to seven genera from India. Bidirectional sequences were recovered for every plastid locus by direct sequencing of polymerase chain reaction （PCR） amplicons in all the accessions tested. However, only 35 （58%） and 4o accessions （66~） yielded ITS and ITS2 sequences, respectively, by direct sequencing. In different bioinformatics analyses, matK and rbcL consistently resolved 15 species （75%） into monophyletic groups and five species into two para- phyletic groups. The 173 ITS sequences, including 138 cloned sequences from 23 accessions, discriminated only 12 species （6o%）, and the remaining species were entered into three paraphyletic groups. Phylogenetic and genealogic analyses of plastid and ITS sequences imply the possible occurrence ofnatural hybridizations in the evolutionary past in giving rise to species paraphyly and intragenomic ITS heterogeneity in the species tested. The results support using matK and rbcL loci for barcoding Zingiberaceae members and highlight the poor utility of iTS and the highly regarded ITS2 in barcoding this family, and also caution against proposing ITS loci for barcoding taxa based on limited sampling.

关键词： Concerted evolution DNA barcoding ITS heterogeneity natural hybridizations Zingiberaceae

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

A CLINICAL CLASSIFICATION OF HYPERTENSION

引用

Chinese Medical Journal 2006年第1期119卷 80-83页

作者： george thomas DEPARTMENT OF CARDIOLOGY INDIRA GANDHI CO-OPERATIVE HOSPITAL GANDHI NAGAR KOCHI 682 020 INDIA

Hypertension is a common cardiovascular problem worldwide. As with any other disease it is important to assess the severity of the disease. However the present classification of hypertension by the Joint National Committee in its seventh report （JNC 7） with numerical values staging the severity of hypertension is theoretically correct but difficult to apply in practice （Table 1）. Admittedly this is a step in the right direction with lesser number of stages compared to the sixth report.

关键词： hypertension classification, cfinical treatment outcomes qualitative aspects

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Posterior tibial nerve stimulation for fecal incontinence:Where are we?

引用

World Journal of Gastroenterology 2013年第48期19卷 9139-9145页

作者： Anil thomas george Rudra Krishna Maitra Charles Maxwell-Armstrong Colorectal Surgery St Mark’s Hospital London HA1 3UJ United Kingdom Colorectal Surgery Queen’s Medical Center University Hospital Nottingham NG7 2UH United Kingdom

Neurostimulation remains the mainstay of treatment for patients with faecal incontinence who fails to respond to available conservative *** nerve stimulation(SNS)is the main form of neurostimulation that is in use *** tibial nerve stimulation(PTNS)-both the percutaneous and the transcutaneous routes-remains a relatively new entry in *** in its infancy,PTNS holds promise to be an effective,patient friendly,safe and cheap ***,presently PTNS only appears to have a minor role with SNS having the limelight in treating patients with faecal *** seems to have arisen as the strong,uniform and evidence based data on SNS remains to have been unchallenged yet by the weak,disjointed and unsupported evidence for both percutaneous and transcutaneous *** use of PTNS is slowly gaining ***,several questions remain unanswered in the delivery of *** have raised dilemmas which as long as they remain unsolved can considerably weaken the argument that PTNS could offer a viable alternative to *** paper reviews available information on PTNS and focuses on these dilemmas in the light of existing evidence.

关键词： Posterior tibial nerve stimulation Percutaneous Transcutaneous Faecal incontinence Efficacy of treatment Neurostimulation

来源：

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

Association of rs1568885, rs1813443 and rs4411591 polymorphisms with anti-TNF medication response in Greek patients with Crohn's disease

引用

World Journal of Gastroenterology 2014年第13期20卷 3609-3614页

作者： Diamantis thomas Maria Gazouli Theodoros Karantanos Stella Rigoglou Georgios Karamanolis Konstantinos Bramis george Zografos george E Theodoropoulos Colorectal Unit 1st Department of Propaedeutic Surgery"Hippokrateio" HospitalSchool of MedicineUniversity of Athens11527 AthensGreece Department of Basic Medical Science Laboratory of BiologySchool of MedicineUniversity of Athens11527 AthensGreece Gastroenterology Unit 2nd Department of Surgery"Aretaieio" HospitalUniversity of AthensAthens 11527Greece

AIM: To investigate the correlation between rs1568885, rs1813443 and rs4411591 polymorphisms and response to infliximab in a cohort of Greek patients with Crohn’s disease (CD).

关键词： Crohn’ s disease, Treatment response, Infliximab, Polymorphisms

来源：

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

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：