检索结果-南通市图书馆

Automated segmentation technique with self-driven post-processing for histopathological breast cancer images

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

CAAI Transactions on Intelligence Technology 2020年第4期5卷 294-300页

作者： chetna k.ushal Anshu Singla Chitk.ra University Institute of Engineering and Technology Chitkara UniversityPunjabIndia

Automated segmentation of histopathological images is a challenging task.to detect cancerous cells in breast *** reviews state high accuracy to segment image,but depends on user input,say window area size,time steps,level set,magnification factor and so *** extract the region of interest effectively,the subject expert performs post-processing operations several times on the segmentation results with different input values for different parameters say,area opening,fill holes and selects most appropriate enhanced image required for further *** authors proposed an automated segmentation technique followed by self-driven post-processing operations to detect cancerous cells *** post-processing method itself determines the value of different parameters for different operations based on segmented results *** proposed technique has the following features:(i)technique is context sensitive;(ii)no prior setting of time step,weighted area coefficient parameters is required;(iii)magnification independent;(iv)post-processing operations are self-driven which enhance segmentation results *** experimental results are compared with four state-of-the-art techniques:fuzzy C-means,spatial fuzzy C-means,spatial neutrosophic distance regularised level set and convolutional neural network.based *** results obtained on two publicly available data sets show that the proposed technique outperforms effectively.

关键词： operations image segmentation

Alteration of structural, optical and electrical properties of CdSe incorporated polyvinyl pyrrolidone nanocomposite for memory devices

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 Advanced Dielectrics 2018年第3期8卷 64-78页

作者： chetna Tyagi Ambik. Devi Department of Applied Sciences The NorthCap University Gurugram 122017 HaryanaIndia

The important enhancement in the structural,dielectric and optical properties of pure polymer and CdSe incorporated polyvinyl pyrrolidone has been reported in this *** surface morphology of CdSe/PVP nanocomposite film is studied by using scanning electron microscopy(SEM).The chemical composition of different elements has been reported using energy dispersive X-ray(EDX)*** structure of polymer nanocomposite is determined with the help of X-ray diffraction(XRD)spectrum and is observed to be *** size,intercrystalline separation,interplanner spacing,lattice parameters,strain and dislocation factors are calculated using XRD *** transform infrared spectroscopy(FTIR)and Photoluminescence(PL)analysis have been studied in order to check.the possible interaction between CdSe quantum dots and polyvinyl pyrrolidone(PVP)*** ac conductivity of CdSe/PVP nanocomposite is found to be higher as compared to pure *** highest value of conductivity observed at 60203 Hz and at 523 k.is found to be 3:72105 Sm*** study of dielectric constant,dielectric losses,dissipation factor,electric modulus and impedance has been *** semi-circles in impedance measurement for both materials show the bulk.electrical properties that result in single relaxation process in CdSe/PVP nanocomposite.

关键词： Nanocomposites activation energy FTIR refractive index

Production of liquid bio-fuel from catalytic de-oxygenation:Pyrolysis of beech wood and flax shives

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

燃料化学学报 2019年第2期47卷 153-166页

作者： chetna Mohabeer Luis Reyes Lok.ane Abdelouahed Stéphane Marcotte Jean-Christophe Buvat Lucette Tidahy Edmond Abi-Aad Bechara Taouk Normandie Univ INSA Rouen NormandieUNIROUENLaboratoire de Sécurité des Procédés Chimiques Normandie Univ INSA Rouen NormandieUNIROUEN Université du Littoral Cte d'Opale Unité de Chimie Environnementale et Interactions sur le Vivant

This study presents a detailed analysis of the catalytic de-oxygenation of the liquid and gaseous pyrolytic products of two biomasses (beech wood and flax shives) using different catalysts (commercial HZSM-5 and H-Y,and lab-synthesised Fe-HZSM-5,Fe-H-Y,Pt/Al2O3 and CoMo/Al2O3). The experiments were all conducted in a semi-batch reactor under the same operating conditions for all feed materials. BET specific surface area,BJH pore size distribution and FT-IR technologies have been used to characterise the catalysts,while gas chromatography-mass spectrometry (GC-MS),flame ionisation detection (GC-FID) and thermal conductivity detection (GC-TCD) were used to examine the liquid and gaseous pyrolytic products. It was firstly seen that at higher catalyst-to-biomass ratios of 4∶1,de-oxygenation efficiency did not experience any further significant improvement. FeHZSM-5 was deemed to be the most efficient of the catalysts utilised as it helped reach the lowest oxygen contents in the bio-oils samples and the second best was HZSM-5. It was also found that HZSM-5 and H-Y tended to privilege the decarbonylation route(production of CO),whilst their iron-modified counterparts favoured the decarboxylation one (production of CO2) for both biomasses studied. It was then seen that the major bio-oil components (carboxylic acids) underwent almost complete conversion under catalytic treatment to produce mostly unoxygenated aromatic compounds,phenols and gases lik. CO and CO2. Finally,phenols were seen to be the family most significantly formed from the actions of all catalysts.

关键词： pyrolysis biomass catalytic treatment de-oxygenation bio-oil upgrading

Integrated self-referencing single shot digital holographic microscope and optical tweezer

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

Light(Advanced Manufacturing) 2022年第3期3卷 205-218页

作者： Subhash Utadiya Sachin Joshi Nimit Patel chetna Patel Mugdha Joglek.r Vani Cahhniwal Timothy O’Connor Bahram Javidi Arun Anand Optics Laboratory Applied Physics DepartmentFaculty of Technology and EngineeringThe Maharaja Sayajirao University of BarodaVadodara 390001India Department of Electrical and Computer Engineering University of ConnecticutStorrsCT06269-4157USA Institute of Interdisciplinary Studies The Maharaja Sayajirao University of BarodaVadodaraIndia

Digital holographic microscopy is a single-shot technique for quantitative phase imaging of samples,yielding thick.ess profiles of phase *** provides sample features based on their morphology,leading to their classification and ***,observing samples,especially cells,in fluids using holographic microscopes is difficult without immobilizing the *** tweezers can be used for sample immobilization in *** present manuscript provides an overview of our ongoing work.on the development of a compact,low-cost microscopy system for digital holographic imaging of optically trapped *** of digital holographic microscopy system with tweezers is realized by using the optical pick.p unit extracted from DVD burners to trap microsamples,which are then holographically imaged using a highly compact self-referencing interferometer along with a low-cost,in-house developed quadrant photodiode,providing morphological and spectral information of trapped *** developed integrated module was tested using polystyrene microspheres as well as human *** investigated system offers a multitude of sample features,including physical and mechanical parameters and corner frequency information of the *** features were used for sample *** proposed technique has vast potential in opening up new avenues for low-cost,digital holographic imaging and analysis of immobilized samples in fluids and their classification.

关键词： Digital holographic microscopy Optical tweezers Red blood cells Quantitative phase imaging

术后胃瘫与Roux-en-Y重建消化道肠—肠吻合方式的相关性分析：回顾性临床研究

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

术后胃瘫与Roux-en-Y重建消化道肠—肠吻合方式的相关性分析：回...

作者：黛薇（chetna-Devi RAGHOONUNDUN）东南大学

学位级别：硕士

背景:胃瘫是腹部外科手术后较为常见的并发症,也是住院时间延长和再次入院的常见原因。在许多腹部手术的消化道重建方式中,Roux-en-Y已被证明比Billroth Ⅰ和Billroth Ⅱ有更少的手术并发症,不过,Roux-en-Y术后胃瘫的发病率相对较高,其... 详细信息

背景:胃瘫是腹部外科手术后较为常见的并发症,也是住院时间延长和再次入院的常见原因。在许多腹部手术的消化道重建方式中,Roux-en-Y已被证明比Billroth Ⅰ和Billroth Ⅱ有更少的手术并发症,不过,Roux-en-Y术后胃瘫的发病率相对较高,其形成机制迄今尚未完全明了。Roux-en-Y胃肠道重建至少有2个吻合口,一个是头侧的(胃-肠、胆-肠或胰-肠)吻合口,另一个是尾侧的肠-肠吻合口肠肠吻合可分两种术式:侧侧吻合与端侧吻合。目前肠肠吻合与术后胃瘫发生尚不清楚。目的:通过回顾性临床研究,分析术后胃瘫与Roux-en-Y重建消化道肠-肠吻合方式之间的关系。方法:收集2013年7月至2017年10月在中大医院行Roux-en-Y,重建消化道手术但保留了全胃或近端胃的病例进行回顾性研究。总共回顾分析符合纳入标准的180例Roux-en-Y重建手术病例,探讨吻合方式与术后胃瘫的相关性。结果:在180例Roux-en-y吻合术后患者中,胃瘫发病率为23%(n = 41)。肠-肠侧侧吻合术后胃瘫的发生率明显高于肠-肠端侧吻合(28%(33/118)vs13%(8/62),P =0.022)。结论:术后胃瘫的发病率与吻合口的重建方式有明显的关系。Roux-en-Y术式中采用肠肠侧侧吻合方式的患者更容易出现术后胃瘫。

关键词： Roux-en-Y Billroth 吻合术后胃瘫侧侧吻合端侧吻合