检索结果-南通市图书馆

Autoimmune pancreatitis in the context of IgG4-related disease:Review of imaging findings

World Journal of Gastroenterology 2014年第41期20卷 15177-15189页

作者： Leslie k Lee Dushyant v Sahani Division of Abdominal Imaging and Intervention Department of RadiologyMassachusetts General HospitalHarvard Medical School

Current understanding of autoimmune pancreatitis (AIP) recognizes a histopathological subtype of the disease to fall within the spectrum of IgG4-related disease. Along with clinical, laboratory, and histopathological data, imaging plays an important role in the diagnosis and management of AIP, and more broadly, within the spectrum of IgG4-related disease. In addition to the defined role of imaging in consensus diagnostic protocols, an array of imaging modalities can provide complementary data to address specific clinical concerns. These include contrast-enhanced computed tomography (CT) and magnetic resonance (MR) imaging for pancreatic parenchymal lesion localization and characterization, endoscopic retrograde and magnetic resonance cholangiopancreatography (ERCP and MRCP) to assess for duct involvement, and more recently, positron emission tomography (PET) imaging to assess for extra-pancreatic sites of involvement. While the imaging appearance of AIP varies widely, certain imaging features are more likely to represent AIP than alternate diagnoses, such as pancreatic cancer. While nonspecific, imaging findings which favor a diagnosis of AIP rather than pancreatic cancer include: delayed enhancement of affected pancreas, mild dilatation of the main pancreatic duct over a long segment, the “capsule” and “penetrating duct” signs, and responsiveness to corticosteroid therapy. Systemic, extra-pancreatic sites of involvement are also often seen in AIP and IgG4-related disease, and typically respond to corticosteroid therapy. Imaging by CT, MR, and PET also play a role in the diagnosis and monitoring after treatment of involved sites.

关键词： Autoimmune pancreatitis IgG4-related disease Pancreatic cancer Imaging Computed tomography Magnetic resonance Positron emission tomography Review

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

Physical vapor transport growth and morphology of Bi2Se3 microcrystals

引用

Particuology 2016年第3期14卷 118-122页

作者： v.v. Atuchin S.v. Borisov T.A. Gavrilova k.A. kokh N.v. kuratieva N.v. Pervukhina Laboratory of Optical Materials and Structures Institute of Semiconductor Physics SB RAS Novosibirsk 630090 Russia Functional Electronics Laboratory Tomsk State University Tomsk 634050 Russia Laboratory of Semiconductor and Dielectric Materials Novosibirsk State University Novosibirsk 630090 Russia Laboratory of Crystul Chemistry Institute of Inorganic Chemistry SB RAS Novosibirsk 630090 Russia Laboratory of Nanodiagnostics and Nanolithography Institute of Semiconductor Physics SB RAS Novosibirsk 630090 Russia Laboratory of Crystal Growth Institute of Geology and Mineralogy SB RAS Novosibirsk 630090 Russia Geology and Mineralogy Department Novosibirsk State University Novosibirsk 630090 Russia Spintronics Laboratory Saint Petersburg State University Saint Petersburg 198504 Russia Laboratory of Research Methods of Composition and Structure of Functional Materials Novosibirsk State University Novosibirsk 630090 Russia

High-quality Bi2Se3 microcrystals were grown by the physical vapor transport （PvT） method without using a foreign transport agent. The microplate crystals grown under the optimal temperature gradient are well faceted and have dimensions up to -200 μm, The growth proceeds by the layer-by-layer mecha- nism with the formation of flat low-growth rate facets. The phase composition of the grown crystals was identified by the X-ray single crystal structure analysis in space group R3m, a = 4.1356（3）, C= 28.634（5）A, Z=3 （R=0.0147）. The most probable twin planes in the tetradymite structure were evaluated by the pseudo translational sublattice merhad.

关键词： Bi2Se3 Physical vapor transport Structure Twin

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

QSAR analysis on benzodithiazine derivatives as HIv-1 integrase inhibitors

引用

Asian Pacific Journal of Tropical Medicine 2009年第3期2卷 15-22页

作者： Ravichandran v Jain A Mourya v.k Agrawal R.k Department of Pharmaceutical Chemistry Faculty of PharmacyAIMST UniversitySemelingKedahMalaysia Pharmaceutical Chemistry Research Laboratory Dept.of Pharmaceutical SciencesDr.Hari Singh Gour UniversitySagar(M.P)-470 003India Govt.College of Pharmacy OsmanpuraAurangabadMaharashtraIndia

Objective:Inhibition of HIv-1 integrase is an important strategy for the treatment of HIv and ***-fore, HIv-1 integrase inhibitory activity of 3-aroyl-1,1-dioxo-1,4,2-benzodithiazines has been analyzed with different physicochemical ***:In the present work,quantitative structure activity relationship studies were performed on a series of benzodithiazines as HIv-1 integrase inhibitors using the modeling software Win CAChe version *** linear regression analysis was performed to derive quantitative structure activity relationship models which were further evaluated for statistical significance and predictive power by internal and external ***:The best QSAR models were having good correlation coefficient (r) with low standard error of estimation(SEE) and cross validated square of correlation coefficient (q^2 ).The robustness of the models was checked by Y-randomization test and they were identified as good predictive *** model for HIv integrase(wt) inhibitory activity of benzodithiazines suggest that the increase of dipole moment(Z) of molecules leads to reduce 3’processing and strand transfer inhibitory activity, substitution with high electro positive groups is conducive for the 3’processing inhibitory activity,and the increase in heat of formation is favorable for 3 -processing and strand transfer inhibitory ***: The model for HIv integrase(C65s) inhibitory activity of benzodithiazines suggest that the increase of dipole moment(X) of molecules leads to reduce 3’processing and strand transfer inhibitory activity,and the substitution with high hydrophobic groups is conducive for the 3’processing and strand transfer inhibitory.

关键词： Human immunodeficiency virus Integrase Inhibition Quantitative Structure Activity Relationship Benzodithiazines

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

Design and Analysis of Novel Three-Phase PFC for IM Drives

引用

Intelligent Automation & Soft Computing 2023年第1期35卷 231-241页

作者： v.kavitha k.Subramanian vIT University VelloreTamil Nadu632014India Faculty of School of Electrical Engineering VIT UniversityVelloreTamil Nadu632014India

Induction motor drives(IMDs)can achieve high performance levels comparable to dc motor drives.A major problem in getting high dynamic performance in an IMD is the coupling between theflux and torque producing components of stator *** is successfully overcome in FOC(Field-Oriented Control)IM,making it to the industry standard *** performance of an IMD with an improved power quality converter at the front end is presented in this *** the IMD,boost converter is employed to reduce power quality difficulties at the utility *** the boost converter contains only one switch,it results in a low processing time and *** ensure sinusoidal supply currents with high PF(Power Factor)and minimal THD(Total Harmonic Distortion),a novel PFC(Power Factor Corrector)control technique is *** enhance the performance of the converter and to lower distortions at the motor side,PI(Proportional Integral)controller is incorporated at the PFC *** it controls the DC bus *** proposed boost converter improves power quality by lowering overall harmonic distortion of AC mains current,improving power factor correction,and regulating dc-link *** is designed,modelled,and simulated in the MATLAB/simulink *** a DSP(Digital Signal Processor),the suggested system’s performance is experimentally *** system’s performance is evaluated for speed and load torque,and the power quality indices are determined to meet IEEE-519 standards under all operating *** the obtained results,it is evident that the proposed system mitigates the power quality issues effectively.

关键词： Induction motor PI controller boost converter power factor corrector

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

Deep restricted and additive homomorphic ElGamal privacy preservations over big healthcare data

引用

International Journal of Intelligent Computing and Cybernetics 2022年第1期15卷 1-16页

作者： k.Sujatha v.Udayarani School of Computing and IT REVA UniversityBangaloreIndia

Purpose-The purpose of this paper is to improve the privacy in healthcare datasets that hold sensitive *** a stop to privacy divulgence and bestowing relevant information to legitimate users are at the same time said to be of differing ***,the swift evolution of big data has put forward considerable ease to all chores of *** far as the big data era is concerned,propagation and information sharing are said to be the two main *** several research works performed on these aspects,with the incremental nature of data,the likelihood of privacy leakage is also substantially expanded through various benefits availed of big ***,safeguarding data privacy in a complicated environment has become a major ***/methodology/approach-In this study,a method called deep restricted additive homomorphic ElGamal privacy preservation(DR-AHEPP)to preserve the privacy of data even in case of incremental data is *** entropy-based differential privacy quasi identification and DR-AHEPP algorithms are designed,respectively,for obtaining privacy-preserved minimum falsified quasi-identifier set and computationally efficient privacy-preserved ***-Analysis results using Diabetes 130-US hospitals illustrate that the proposed DR-AHEPP method is more significant in preserving privacy on incremental data than existing *** analysis of state-of-the-art works with the objective to minimize information loss,false positive rate and execution time with higher accuracy is ***/value-The paper provides better performance using Diabetes 130-US hospitals for achieving high accuracy,low information loss and false positive *** result illustrates that the proposed method increases the accuracy by 4%and reduces the false positive rate and information loss by 25 and 35%,respectively,as compared to state-of-the-art works.

关键词： Big data Entropy-based differential privacy Quasi-identifier Deep restricted Additive homomorphic ElGamal Privacy preservation

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

Bending sensor based on flexible spin valve

引用

Chinese Physics B 2023年第5期32卷 655-661页

作者： L I Naumova R S Zavornitsyn M A Milyaev N G Bebenin A Y Pavlova M v Makarova I k Maksimova v v Proglyado A A Zakharov v v Ustinov M.N.Miheev Institute of Metal Physics Ural BranchRussian Academy of SciencesS.Kovalevskoi Street 18Ekaterinburg 620990Russia

Flexible spin valves were prepared by magnetron sputtering on polyimide substrates. The buffer layer that reduces significantly the effect of the polymer substrate on the spin valve microstructure and magnetoresistive properties was revealed. Bending deformation was applied to the microobjects based on the flexible spin valves in parallel to anisotropy axes. It was revealed that during the bend the magnetoresistance changes due to the joint impact of both the change of the magnetic field projection on the film plane and the change of the magnetic properties of the ferromagnetic layers. The obtained dependences have been used in construction of bending sensor, in which the flexible spin valve microstripes were united into the Wheatstone bridge.

关键词： spin valve polymer substrate magnetostriction magnetic anisotropy

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

Effect of Ta_(2)O_(5)nanoparticles on bioactivity,composition,structure,in vitro and in vivo behavior of PEO coatings on Mg-alloy

引用

Journal of Magnesium and Alloys 2024年第6期12卷 2360-2379页

作者： D.v.Mashtalyar I.M.Imshinetskiy v.v.kashepa k.v.Nadaraia M.A.Piatkova A.I.Pleshkova k.A.Fomenko A.Yu.Ustinov S.L.Sinebryukhov S.v.Gnedenkov Institute of Chemistry Far Eastern BranchRussian Academy of SciencesVladivostok690022Russia Far Eastern Federal University Vladivostok690950Russia Regional Clinical Dermatovenerological Dispensary Vladivostok690033Russia

The present study investigates the physical and chemical characteristics,behavior in vitro and in vivo,and biocompatibility of coatings containing Ta_(2)O_(5),which are obtained by plasma electrolytic oxidation(PEO)on MA8 magnesium *** obtained coatings demonstrate in vivo biocompatibility and in vitro *** to the base PEO coating,the layers containing Ta_(2)O_(5)facilitate the development of apatite in simulated body fluid,suggesting that the inclusion of nanoparticles improves bioactivity of the *** was found that incorporation of Ta_(2)O_(5)nanoparticles increases roughness and porosity of the formed layers by increasing particle concentration in electrolytes for the PEO process contributing to sufficient soft tissue ingrowth in *** on in vivo studies,these coatings also provide favorable tissue response and minimal inflammatory reaction in comparison with the bare magnesium alloy due to protection of living tissues from deleterious corrosion events of magnesium implant such as local alkalization and intense hydrogen *** results obtained in the present study concluded biocompatibility,tissue integration of the PEO coatings containing Ta_(2)O_(5)nanoparticles making them a promising protective layer for biodegradable magnesium implants.

关键词： Plasma electrolytic oxidation Bioactive coatings Tantalum pentoxide Simulated body fluid(SBF) Apatite formation Histology

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

Lightweight convolutional neural network models for semanticsegmentation of in-field cotton bolls

引用

Artificial Intelligence in Agriculture 2023年第2期8卷 1-19页

作者： Naseeb Singh v.k.Tewari P.k.Biswas L.k.Dhruw Department of Agricultural and Food Engineering IIT KharagpurKharagpur 721302India Department of Electronics and Electrical Communication Engineering IIT KharagpurKharagpur 721302India

Robotic harvesting of cotton bolls will incorporate the benefits of manual picking as well as mechanical harvesting. For robotic harvesting, in-field cotton segmentation with minimal errors is desirable which is a challengingtask. In the present study, three lightweight fully convolutional neural network models were developed for thesemantic segmentation of in-field cotton bolls. Model 1 does not include any residual or skip connections,while model 2 consists of residual connections to tackle the vanishing gradient problem and skip connectionsfor feature concatenation. Model 3 along with residual and skip connections, consists of filters of multiplesizes. The effects of filter size and the dropout rate were studied. All proposed models segment the cotton bollssuccessfully with the cotton-IoU (intersection-over-union) value of above 88.0%. The highest cotton-IoU of91.03% was achieved by model 2. The proposed models achieved F1-score and pixel accuracy values greaterthan 95.0% and 98.0%, respectively. The developed models were compared with existing state-of-the-art networks namely vGG19, ResNet18, EfficientNet-B1, and Inceptionv3. Despite having a limited number of trainableparameters, the proposed models achieved mean-IoU (mean intersection-over-union) of 93.84%, 94.15%, and94.65% against the mean-IoU values of 95.39%, 96.54%, 96.40%, and 96.37% obtained using state-of-the-art networks. The segmentation time for the developed models was reduced up to 52.0% compared to state-of-theart networks. The developed lightweight models segmented the in-field cotton bolls comparatively faster andwith greater accuracy. Hence, developed models can be deployed to cotton harvesting robots for real-time recognition of in-field cotton bolls for harvesting.

关键词： Cotton Semantic segmentation Convolutional neural network Robotic harvesting Image segmentation Deep learning

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

Compositionally Graded Microstructure for Ag-Fe Nanoparticles

引用

Nano-Micro Letters 2012年第3期4卷 172-175页

作者： Chandan Srivastava k.v.L.Sushma Department of Materials Engineering Indian Institute of Science

Ag-Fe nanoparticles with a highly Ag rich average composition were synthesized by the sonochemical ***-iron system exhibits a wide miscibility gap in the bulk ***,a graded compositional profile along the nanoparticle radius was *** at and near the surface of the nanoparticle contained both Ag and Fe *** composition got relatively deficient Fe towards the center of the particle with particle core made up of pure *** of Ag and Fe is confirmed by the absence of diffraction signal corresponding to pure Fe phase and presence of a paramagnetic phase in nanoparticles containing a diamagnetic(Ag)and ferromagnetic(Fe)elements.

关键词： Nanoparticles Electron Microscopy Ag-Fe Miscibility gap Solid solution Microstructure

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

Effect of Phase Shifted Frequency Modulation on Two Level Atom-Field Interaction

引用

Communications in Theoretical Physics 2012年第3期57卷 468-472页

作者： k.v.Priyesh Ramesh Babu Thayyullathil Department of Physics Cochin University of Science and Technology

We have studied the effect of phase shifted frequency modulation on two level atom with field interaction using Jaynes-Cummings *** the frequency of the interacting field is sinusoidally varying with time with a constant *** to the presence of phase in the frequency modulation,the variation of population inversion with time is different from the standard *** are no exact collapses and revivals in the variation of population inversion but it oscillates sinusoidally with *** coherent field atom interaction the population inversion behaves as in the case of Fock state atom interaction,when frequency modulation with a non zero phase is *** study done with squeezed field has shown the same behavior of the population inversion.

关键词： Jaynes-Cummings model two level atom squeezed field

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

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：