检索结果-南通市图书馆

Robust and High Accuracy Algorithm for Detection of Pupil Images

Computers, Materials & Continua 2022年第10期73卷 33-50页

作者： Waleed El nahal Hatim g.Zaini Raghad H.Zaini sherif s.M.ghoneim Ashraf Mohamed Ali Hassan Electronics and Communications Engineering Department Faculty of EngineeringMSA UniversityCO12585Egypt Computer Engineering Department College of Computer and Information TechnologyTaif UniversityTaif21944Saudi Arabia Faculty of Health and Rehabilitation sciences Princess Nourah bint Abdulrahman UniversityRiyadhSaudi Arabia Department of Electrical Engineering College of EngineeringTaif UniversityTaif21944Saudi Arabia Electronics and Communications Engineering Department Faculty of EngineeringSinai UniversityArishCO45511Egypt

Recently,many researchers have tried to develop a robust,fast,and accurate *** algorithm is for eye-tracking and detecting pupil position in many applications such as head-mounted eye tracking,gaze-based human-computer interaction,medical applications(such as deaf and diabetes patients),and attention *** real-world conditions challenge the eye appearance,such as illumination,reflections,and *** the other hand,individual differences in eye physiology and other sources of noise,such as contact lenses or *** present work introduces a robust pupil detection algorithm with and higher accuracy than the previous attempts for real-time analytics *** proposed circular hough transform with morphing canny edge detection for Pupillometery(CHMCEP)algorithm can detect even the blurred or noisy images by using different filtering methods in the pre-processing or start phase to remove the blur and noise and finally the second filtering process before the circular Hough transform for the center fitting to make sure better *** performance of the proposed CHMCEP algorithm was tested against recent pupil detection *** and results show that the proposed CHMCEP algorithm achieved detection rates of 87.11,78.54,58,and 78 according to´swirski,ExCuse,Else,and labeled pupils in the wild(LPW)data sets,*** results show that the proposed approach performs better than the other pupil detection methods by a large margin by providing exact and robust pupil positions on challenging ordinary eye pictures.

关键词： Pupil detection eye tracking pupil edge morphing techniques eye images dataset

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

The L4n laser beamline of the P3-installation:Towards high-repetition rate high-energy density physics at ELI-beamlines

引用

Matter and Radiation at Extremes 2021年第1期6卷 45-53页

作者： n.Jourdain U.Chaulagain M.Havlik D.Kramer D.Kumar V.T.Tikhonchuk g.Korn s.Weber ELI-beamlines Institute of PhysicsCzech Academy of Sciences18221 PragueCzech Republic Centre Lasers Intenses et Applications University of Bordeaux-CNRS-CEA33405 TalenceFrance school of science Xi’an Jiaotong UniversityXi’an 710049China

The P3 installation of ELI-beamlines is conceived as an experimental platform for multiple high-repetition-rate laser beams spanning time scales from femtosecond via picosecond to *** upcoming L4n laser beamline will provide shaped nanosecond pulses of up to 1.9 kJ at a maximum repetition rate of 1 shot/*** beamline will provide unique possibilities for high-pressure,high-energy-density physics,warm dense matter,and laser–plasma interaction *** to the high repetition rate,it will become possible to obtain considerable improvements in data statistics,in particular,for equation-of-state data *** nanosecond beam will be coupled with short sub-picosecond pulses,providing high-resolution diagnostic tools by either irradiating a backlighter target or driving a betatron setup to generate energetic electrons and hard X-rays.

关键词： laser repetition beam

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

Management of Pediatric Abdominal surgical Emergencies in northern benin

引用

Open Journal of Pediatrics 2020年第2期10卷 314-319页

作者： M. g. Yassegoungbe b. Tamou sambo D. M. seto M. A. Hodonou s. b. noukpozounkou b. R. Assan s. A. Allode Pediatric surgery National Teaching Hospital Hubert Koutoukou Maga Cotonou Benin general surgery Teaching Hospital of Parakou Parakou Benin University Clinic of Visceral surgery National Teaching Hospital Hubert Koutoukou Maga Cotonou Benin

background: Pediatric abdominal surgical emergencies are major causes of morbidity and mortality. The goal was to identify the main determinants of their management and access to assess their evolution. Patients and m... 详细信息

strong>backgroundstrong>: Pediatric abdominal surgical emergencies are major causes of morbidity and mortality. The goal was to identify the main determinants of their management and access to assess their evolution. b>Patients and methods:b> This is a prospective, descriptive and analytical study performed at Parakou teaching hospital and Tanguieta district hospital. It has been conducted from January 1st to July 31st 2016. All children were included aged 0 to 15 years and admitted for an abdominal surgical emergency with a Clinical Classification of Emergency Patients listed from 3 to 5. b>Results:b> Pediatric abdominal surgical emergencies accounted for 42.8% of pediatric surgical emergencies. The average age was 9.3 ± 3.5 years old. The sex ratio was 1.7. The most encountered etiologies were peritonitis (36.76%), abdominal trauma (16.17%) and anorectal malformations (14.71%). The comparison of the delay in operative treatment with the World Society of Emergency Surgery shows a delay in 82.35% of cases. Mortality was high preoperatively and was related to the neonatal period (p = 0.027) and to a resuscitation length of stay higher than 36 hours (p = 0.035). b>Conclusion:b> Surgical care was delayed, mainly due to the lack of technical capacities. Morbidity and mortality were relatively low.span>

关键词： Abdominal surgical Emergency Pediatrics Peritonitis Delay in surgery

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

Risk Assessment of Heavy Metals in Food Crops at Abandoned Lead-Zinc Mining site at Tse-Faga, Logo, Lga, benue state, nigeria

引用

Journal of Environmental Protection 2021年第9期12卷 624-638页

作者： Paul n. samuel bolaji b. babatunde World bank Africa Center of Excellence for Public Health and Toxicological Research (ACE-PUTOR) University of Port Harcourt Choba Port Harcourt Rivers State Nigeria Animal and Environmental biology Department University of Port Harcourt Choba Port Harcourt Rivers State Nigeria

Hundreds of children died in 2010 due to suspected lead poisoning from mining sources in Zamfara state among epidemiological concerns. Evaluating ecological and human health risks of heavy metals levels in sampled food crops harvested near two abandoned Lead-Zinc mining sites at Logo benue state is crucial. Abelmoschus esculentus, Carica papaya, Manihot esculenta, and Zea mays were sampled, prepared, and analyzed for four heavy metals using the Atomic Absorption spectrophotometric method. The mean data from the analysis of variance was subjected to ecological and health risk models. Pb means value ranged from Carica papaya Peel 0.46 ± 0.011 mg/kg to 1.30 ± 0.01 mg/kg in Zea mays seed. Zn was highest in Carica papaya flesh 0.50 ± 0.01 mg/kg, and lowest in Manihot esculenta peels and its flesh 0.12 ± 0.000 mg/kg. Hg and Cd were below detectable levels. Zea mays seeds (1.001) had the highest Pd bioaccumulation factor. bAF of zinc and ecological indices were ntake of Metals were all nt (HQ) of Pb was ≥1 in Manihot esculenta flesh 1.143 and Zea mays at 1714. Cancer Risks were within permissible range (10sup>-4sup> - 10sup>-6sup>). Health Risk result indicates communities around the mining area may be at risk of lead poisoning therefore due to high contamination of samples, routine checks on heavy metals especially lead is recommended to prevent excessive bioaccumulation in the body.

关键词： Mining Food Crops Heavy Metals Ecological Risk Health Risks Lead Poisoning

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

Mixed-conducting ceramic–carbonate membranes exhibiting high CO2/O2 permeation flux and stability at high temperatures

引用

Journal of Advanced Ceramics 2020年第1期9卷 94-106页

作者： R.ORTEgA-LUgO J.A.FAbIAn-AngUIAnO O.OVALLE-EnCInIA C.gOMEZ-YAnEZ b.H.ZEIFERT J.ORTIZ-LAnDEROs Instituto Politécnico nacional Escuela Superior de Ingeniería Química e Industrias ExtractivasDepartamento de Ingeniería en Metalurgia y MaterialesUPALM-ZacatencoMexico City 07738Mexico Chemical Engineering school for Engineering of Matter Transport and EnergyArizona State UniversityTempeAZ 85287-6106USA

This investigation demonstrates the feasibility to fabricate high quality ceramic–carbonate membranes based on mixed-conducting ***,it is reported the simultaneous CO2/O2 permeation and stability properties of membranes constituted by a combination of ceramic and carbonate phases,wherein the microstructure of the ceramic part is composed,in turn,of a mixture of fluorite and perovskite *** ceramics showed ionic and electronic conduction,and at the operation temperature,the carbonate phase of the membranes is in liquid state,which allows the transport of CO32-and O2–species via different *** fabricate the membranes,the ceramic powders were uniaxially pressed in a disk ***,an incipient sintering treatment was carried out in such a way that a highly porous ceramic was ***,the piece is densified by the infiltration of molten *** of the membranes was accomplished by sEM,XRD,and gas permeation techniques among *** and chemical stability under an atmosphere rich in CO2 was ***2/O2 permeation and long-term stability measurements were conducted between 850 and 940℃.The best permeation–separation performance of membranes of about 1 mm thickness,showed a maximum permeance flux of about 4.46×10^–7 mol·m^–2·s^–1·Pa^–1 for CO2 and 2.18×10^–7 mol·m^–2·s^–1·Pa^–1 for O2 at 940℃.Membranes exhibited separation factor values of 150–991 and 49–511 for CO2/n2 and O2/n2 respectively in the studied temperature *** long-term stability test showed certain microstructural changes in the membranes,no significant detriment on the permeation properties was observed along 100 h of continuous operation.

关键词： CO2 separation O2 separation ceramic–carbonate membrane selectivity

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

Analytical study of Two Differently Ranked Coals Using UV-VIs-nIR spectroscopy

引用

Journal of Minerals and Materials Characterization and Engineering 2011年第10期10卷 905-911页

作者： b. Manoj A.g. Kunjomana Department of Physics Christ University Hosur Road Bangalore Karnataka India 560029

The characterization of Indian bituminous and subbituminous coal was performed by UVVisible– nIR spectroscopy. Chemical leaching with varying concentration of hydrofluoric acid was conducted on both the samples. Electronic absorption at this region was higher for higher ranked coals. Chemical leaching increased electronic transitions in subbituminous coal with maximum transitions for HF (10%) leached samples. The absorption maximum of benzeneoxygen system was found between 235-270 nm and was showing a red shift with leaching. The characteristic naphthalene ring systems (220 & 280 nm) were masked by the absorption regions of monoaromatic rings;indicating the content of napthalenoid hydrocarbon was very low. The bands observed in the visible region (450nm) were attributed to sO2 in the sample and was showing a red shift. The weak band at the 680 nm was attributed to the Ⅱ-Ⅱ* electronic transitions of the polynuclear aromatic hydrocarbons which also showed red shift with leaching. It was found that the ash content is reduced by 87.5% & 76.2% in bituminous and subbituminous coal respectively with HF (30%) leaching.

关键词： UV-VIs-nIR spectroscopy Coal characterization chemical leaching proximateanalysis.

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

Pressure and Doping Effects on Critical Temperature in Mgb_2 and nonmagnetic borocarbides within Two-band Eliashberg Theory

引用

Communications in Theoretical Physics 2010年第6期53卷 1181-1184页

作者： I.n.Askerzade Computer Engineering Department of Engineering Faculty of Ankara University Institute of Physics Azerbaijan national Academy of sciences

Critical temperature of Mg1-xAlxb2, Mgb2-xCx are calculated using two-band Eliashberg theory in intermediate e-ph coupling. Analytical calculations are conducted for different values of doping parameters x in this compounds. Pressure effects on critical temperature in Mgb2 and nonmagnetic borocarbide Yni2b2C are also investigated. Results is compared with available experimental data and good agreement is achieved.

关键词： Jtwo-band superconductivity Eliashberg theory magnesium diboride nonmagnetic borocarbides

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

Temperature-Programmed Reduction and Dispersive X-Ray Absorption spectroscopy studies of CeO<sub>2</sub>-based nanopowders for Intermediate-Temperature solid-Oxide Fuel Cell Anodes

引用

Materials sciences and Applications 2019年第10期10卷 631-642页

作者： Marina s. bellora Joaquí n sacanell Cristiá n Huck-Iriart Analí a L. soldati susana A. Larrondo Diego g. Lamas COnICET/Laboratorio de Cristalografía Aplicada Escuela de Ciencia y Tecnología Universidad Nacional de General San Martín San Martín Argentina Departamento de Física de la Materia Condensada Gerencia de Investigación y Aplicaciones Centro Atómico Constituyentes Comisión Nacional de Energía Atómica San Martín Argentina Instituto de nanociencia y nanotecnología (Inn) CNEA-CONICET San Martín and San Carlos de Bariloche Argentina UnIDEF-COnICET-MInDEF Departamento de Investigaciones en Sólidos CITEDEF Villa Martelli Argentina Instituto de Investigación e Ingeniería Ambiental Universidad Nacional de General San Martín San Martín Argentina

In this work, we study the influence of the average crystallite size and dopant oxide on the reducibility of CeO2-based nanomaterials. samples were prepared from commercial gd2O3-, sm2O3- and Y2O3-doped CeO2 powders by calcination at different temperatures ranging between 400°C and 900°C and characterized by X-ray powder diffraction, transmission electron microscopy and bET specific surface area. The reducibility of the samples was analyzed by temperature-programmed reduction and in situ dispersive X-ray absorption spectroscopy techniques. Our results clearly demonstrate that samples treated at lower temperatures, of smallest average crystallite size and highest specific surface areas, exhibit the best performance, while gd2O3-doped ceria materials display higher reducibility than sm2O3- and Y2O3-doped CeO2.

关键词： Crystallite size CeO2-based nanomaterials sm2O3

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

Effect of Hydrostatic Pressure on Optical Properties of Tlbr and TlCl

引用

计算物理 2013年第2期30卷 265-270页

作者： Amrane n benkraouda M Department of Physics United Arab Emirates UniversityAl-AinP.O.Box 17551United Arab Emirates

We present first principles calculations of optical properties of binary semiconductor compounds Tlbr and *** of dielectric function,reflectivity and refractive index on hydrostatic pressure are calculated using self-consistent scalar relativistic full potential linear augmented plane wave method(FP-LAPW) within a generalized gradient approximation(ggA).They are compared with previous calculations and experimental *** agreements are found.

关键词： optical properties dielectric function refractive index radiation detectors

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

study of asphaltene reaggregation in toluene/heptane mixture by dynamic and static light scattering

引用

Petroleum Research 2024年第1期9卷 48-54页

作者： Vladimir n.Kuryakov Oil and gas Research Institute of RAs(OgRI RAs) Gubkina Str.3119333MoscowRussian Federation

This paper presents the study of the effect of multiple ultrasonic impacts on submicron asphaltene aggregates in a toluene/heptane solution,conducted with dynamic light scattering *** objects of the study were four samples of asphaltenes obtained from four different *** all samples,the change in the average size of the asphaltene submicron aggregates with time was measured after the addition of a precipitant(heptane)to a solution of asphaltenes in toluene at an amount above the threshold *** aggregates formed in solution after the addition of the precipitant and were subjected to ultrasonic treatment,which led to the destruction of the asphaltene *** of destroyed asphaltenes was *** kinetics of this aggregation were similar to the kinetics of aggregation of asphaltenes after the addition of a *** iterations of asphaltene aggregate destruction in the sample led to a significant change in the kinetics of aggregation:the growth of aggregates slowed and stabilized at a size of approximately 200 nm and 30 nm for the different studied samples.

关键词： Asphaltenes Aggregation sonication Dynamic light scattering Re-aggregation Colloidal stability Resins

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：