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国际医学放射学杂志 2020年第2期 241-242页

作者： A.Majkowska s.Mittal D.F.steiner J.J.reicher s.M.McKinney G.E.Duggan 李璐 Google Health

深度学习有望增加胸片在临床放射学中的应用,但面临的挑战包括推广性差、疾病谱偏倚和研究间的比较困难。目的采用放射科医生的判定作为参考标准,开发和评价

关键词：放射科医生深度学习模型

stress gastric ulcer after cardiac surgery: Pathogenesis risk factors and medical management

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World Journal of Cardiovascular Diseases 2013年第3期3卷 312-316页

作者： Mahdi Ait Houssa Noureddine Atmani Fouad nya Abdessamad Abdou Younes Moutakiallah Mehdi Bamous Mohamed Drissi Abdelatif Boulahya Cardiac surgery Department Military Hospital Institute Rabat Morocco

stress ulcer lesions of upper gastrointestinal tract are well recognized in patients undergoing open cardiac surgery. Gastrointestinal bleeding following cardiac surgery is infrequent with significant morbidity and mortality. The pathogenesis of mucosal lesions and subsequent haemorrhage is complex and multifactorial. The diagnosis as well as the treatment of this complication remains a challenge for surgeons. Identifying the source of bleeding can be difficult. Despite of the successful control of haemorrhage using various combinations of endoscopic and pharmacological therapies, the mortality rate remains unchanged. Benefit of routine stress ulcer prophylaxis remains controversial.

关键词： stress Gastric Ulcer Upper Gastrointestinal Bleeding Cardiac surgery

Accumulation of Heavy Metals in Maga-Pouss Rice Fields (Far-North Region, Cameroon) and Transfer to Rice Grains

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Agricultural sciences 2024年第3期15卷 311-326页

作者： Diane Madomguia Gilbert Bello Basokdou Kalieu W. Appoline Isabelle Patrice Kuitekam Dongo Edouard nya serge Hubert Zebaze Togouet Department of Hydraulics and Water Management National Advanced School of Engineering University of Maroua Maroua Cameroon Research Center of Global studies with Multidisciplinary Units (CREGUM) Maroua Cameroon National Laboratory of Analysis of Agricultural Inputs and Products Ministry of Agriculture and Rural Development Messa-Yaoundé Cameroon Department of Animal Physiology and Biology Faculty of Sciences University of Yaoundé I Yaoundé Cameroon

Monitoring of heavy metals contamination of agricultural products and their transfer and bioaccumulation in crops like rice has become a hot topic worldwide over the last two decades. The present study was carried out to determine the accumulation of heavy metals in rice fields and their transfer to rice grains. soil, irrigation water and rice grains samples were gathered in Maga-Pouss, Far-North, Cameroon. Concentrations of six heavy metals (lead, cadmium, zinc, copper, iron and mercury) were evaluated by Atomic Absorption spectrophotometer (AAs). Mercury was not detected in this study. Average concentrations of metals were in this order (in mg/kg): Fe (188.60 ± 97.06) > Pb (63.63 ± 7.11) > Cd (2.59 ± 0.29) > Zn (1.10 ± 1.05) > Cu (0.80 ± 0.73) in water and Pb (105.50 ± 31.11) > Fe (105.50 ± 31.11) > Cu (45.93 ± 14.39) > Zn (22.52 ± 6.40) > Cd (3.15 ± 0.49) in soil. Water in Maga-Pouss rice fields appears to be more harmful than the soil, notably for lead, cadmium and copper. In rice grains, heavy metals were found in this order (mg/kg): Fe (188.01 ± 82.62) > Cu (27.20 ± 0.00) > Zn (23.61 ± 12.42) > Pb (19.50 ± 19.91) > Cd (2.02 ± 1.05). The mean bioconcentration factor (BCF) of metals from soil to rice grains was in the following order: Fe (2.60) > Zn (1.05) > Cd (0.64) > Cu (0.59) > Pb (0.18). From water to rice grains, the order is: Cu (37.26) > Zn (22.49) > Cd (6.97) > Pb (2.74) > Fe (1.94). Rice field pH and electrical conductivity favored the uptake of lead, copper and cadmium by rice grains. The findings of this study will be good documentation for risk assessment, and decision-making by environmental managers in this region.

关键词： Heavy Metals Rice Field Bioconcenration Factor Maga-Pouss Accumulation

Metastatic spinal Tumors: Diagnostic Methods, Management and Prognosis at the Yaounde Central Hospital and Yaounde General Hospital

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Open Journal of Modern Neurosurgery 2024年第2期14卷 158-169页

作者： Nassourou Oumarou Haman Figuim Bello Orlane Ndome Toto Roland Ndouh Nchufor nya Durand Bakop Ronaldo Foalou Anu Vincent de Paul Djientcheu Faculty of Medicine and Biomedical sciences University of Yaounde 1 Yaounde Cameroon Neurosurgery Department Yaounde General Hospital Yaounde Cameroon Cameroon Academy of Young scientists Yaounde Cameroon Department of Neurosurgery Garoua General Hospital Garoua Cameroon Faculty of Medicine and Pharmaceutical sciences University of Douala Douala Cameroon Department of Neurosurgery Douala General Hospital Douala Cameroon Facuty of Health sciences University of Bamenda Bamenda Cameroon

Introduction: Metastatic spinal tumors (MsT) refer to secondary involvement of the vertebral column by hematogenously-disseminated metastatic cells. They could affect either the bony structures or the spinal cords. Mechanical instability and neurologic deficits resulting from spinal cord compression are the most common manifestations. surgical intervention remains the most effective treatment for about 20% of patients who present with spinal cord compression. The prognosis is relatively poor. This work has as objectives to describe: the diagnostic tools, the different modalities of management and the prognostic elements of spine metastasis. Methodology: We conducted an ambispective cross-sectional descriptive study;with retrospective data collection from January 2015 to December 2021 and prospective collection from January to April 2022 in the “Neurosurgery” unit of the Yaounde Central Hospital and the “Oncology and Neurosurgery” units of Yaounde General Hospital. Result: We included 101 patients. The M/F sex ratio was 1.66. The average age of the participants was 56.44 years (±14.19 sD) with a median of 58 years. Metastatic spinal tumors were discovered in 61.39% of patients with a previously known primary tumor and 21.78% of patients had newly discovered tumors. The neurologic examination revealed a vertebral syndrome in 79.21% of cases, radicular syndrome in 60.40% and sub-lesional syndrome in 59.89%. sensory disorders accounted for 39.60% and sphincter disorders accounted for 34.65%. According to the degree of severity, the lesions were classified as Frankel E (37.62%) followed by Frankel D (21.78%). Metastatic lesions were mostly found at the thoracic vertebrae (68.25%) and lumbar vertebrae (22.22%). The most represented primary tumors were: prostate tumors (41.58%) and breast tumors (23.76%);followed by malignant hemopathies (15.84%). Computed-tomography scan (CT-scan) was the most frequent diagnostic imaging technique used (71.28%). Analgesic treatment mostly

关键词： Metastases spinal Tumors Diagnosis Prognosis spinal Cord Compression

Effects of Zr substitution on structural,morphological,and magnetic properties of bismuth iron oxide phases

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Chinese Physics B 2017年第8期26卷 450-455页

作者： A Asif M Hassan s Riaz s Naseem s s Hussain Materials Growth and simulation Laboratory Department of PhysicsUniversity of the PunjabLahore-54590Pakistan Center of Excellence in solid state Physics University of the PunjabLahore-54590Pakistan

The present study involves co-precipitation method to grow un-doped and Zr-doped bismuth iron oxide with x_（Zr）=0.10–0.30. The molar solutions of ferric chloride（FeCl_3）, zirconyle chloride（ZrOCl_2）, and bismuth chloride（BiCl_3） are prepared in distilled water, and are allowed to react with sodium hydroxide（Na OH）. The synthesized powders are then converted into pellets, which are sintered at 500℃ for two hours in a muffle furnace. X-ray diffraction（XRD） shows multi-phase formation in un-doped and Zr doped samples. scanning electron microscope（sEM） depicts layered structure at low Zr concentration x_（Zr）= 0.10, while uniform surface with smaller grains and voids is observed at x_（Zr）= 0.20, but at x_（Zr）= 0.30, cracks and voids become prominent. The ferromagnetic nature of the un-doped sample is observed by vibrating sample magnetometer（VsM）, while paramagnetic behavior appears due to Zr doping. The ferromagnetism in un-doped sample is lost by Zr doping, which is due to the formation of additional Fe–O–Zr bonds that induce paramagnetic behavior.

关键词： co-precipitation multi-phases ferromagnetism paramagnetism BiFeO3

Hydromagnetic oscillatory Couette flow in rotating system with induced magnetic field

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Applied Mathematics and Mechanics(English Edition) 2014年第10期35卷 1331-1344页

作者： G.s.sETH s.M.HUssAIN s.sARKAR Department of Applied Mathematics Indian School of Mines Department of Mathematics O.P.Jindal Institute of Technology

This paper presents a study of hydromagnetic Couette flow of an incompress- ible and electrically conducting fluid between two parallel rotating plates, one of which is oscillating in its own plane. A uniform transverse magnetic field is used, and the induced magnetic field is taken into account. The exact solution to the governing equations is obtained in a closed form. The solution to the problem in the case of vanishing and small finite magnetic Prandtl numbers is also derived from the general solution. The asymp- totic behavior of the solution for large values of the frequency parameter is analyzed to gain some physical insights into the flow pattern. Expressions for the shear stress at both the oscillatory and stationary plates due to primary and secondary flows and mass flow rate in the primary and secondary flow directions are also obtained. The results of the fluid velocity and the induced magnetic field are presented. The shear stresses on the plates due to the primary and secondary flows and the corresponding mass flow rates are presented in a tabular form.

关键词： magnetic interaction parameter Ekman number frequency parameter,hydromagnetic stokes-Ekman boundary layer magnetic diffusion boundary layer

soft x-ray tomographic reconstruction of Heliotron J plasma for the study of magnetohydrodynamic equilibrium and stability

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Plasma science and Technology 2019年第6期21卷 72-78页

作者： s PUROHIT Y sUZUKI s OHDACHI s YAMAMOTO sOKENDAI The Graduate University for Advanced Studies Toki Gifu 509-5292 Japan National Institute for Fusion science Toki Gifu 509-5292 Japan Institute of Advanced Energy Kyoto University Gokasho Uji Kyoto 611-0011 Japan

The preparation for an experimental soft x-ray tomography study on the Heliotron J (H-J) machine is carried out,with the objectives of evaluating the capability of the current soft x-ray tomographic system in terms of the identification of different mode structures and their poloidal rotation,and the axis shift with different plasma and machine parameters,and fixing the physics goals for the experimental *** preparations were carried out via a simulated soft x-ray data set arising from different plasma conditions,such as magnetic islands,low beta and high *** x-ray tomography (sXT) is performed by the discrete pixel method including singular value decomposition and Phillips-Tikhonov regularization,to obtain clear and smooth *** H-J soft x-ray tomography results from simulated soft x-rays for the equilibrium H-J plasma sensed the magnetic axis shift clearly and an estimate was also *** reconstruction for mode structure m =1/n =1 was obtained along with the realization of the poloidal rotation of the *** reconstruction for the m =2/n =1 mode was not very clear for the current soft x-ray diagnostic *** mode identification was not possible due to the lack of *** sXT from the current soft x-ray diagnostic on H-J,the magnetic axis shift can be estimated and the m =1/n =1 mode can be *** of higher poloidal modes is difficult with the current design.

关键词： Heliotron J tomography soft x-ray magnetohydrodynamics

suppression of ferroresonance using passive memristor emulator

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Chinese Physics B 2021年第6期30卷 667-674页

作者： s Poornima Electrical Engineering Department Anna UniversityChennai-600025India

Power system inherently consists of capacitance and inductance in its components. Equipment with saturable inductance and circuit capacitance provides circumstances of generating ferroresonance, resulting in overvoltage and overcurrent in the connected system. The effects of ferroresonance result in insulation failure and hence damage to the equipment is unavoidable. Though many devices are proposed for mitigating such circumstances, a promising technology of using memristors may provide better performance than others in the future. A memristor emulator using the N-channel JFET J310 is used in this work. Unlike other electronic components that replicate memristor properties, the chosen memristor emulator is a passive device since it does not need any external power supply. simulation and experimental results verify the design of a memristor emulator and the characteristics of an ideal memristor. Experimental results prove that the memristor emulator can suppress the fundamental ferroresonance induced in a prototype single phase transformer. The results of the harmonic analysis also validate the memristor performance against the conventional technique.

关键词： ferroresonance memristor emulator passive components single-phase transformer

How graph features decipher the soot assisted pigmental energy transport in leaves?A laser-assisted thermal lens study in nanobiophotonics

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Chinese Physics B 2022年第8期31卷 675-681页

作者： s sankararaman Department of Optoelectronics University of KeralaTrivandrum695581KeralaIndia

The paper employs the principles of graph theory in nanobiophotonics, where the soot-assisted intra-pigmental energy transport in leaves is unveiled through the laser-induced thermal lens(TL) technique. Nanofluids with different soot concentrations are sprayed over Lablab purpureus(L) sweet leaves, and the extracted pigments are analyzed. The graph features of the constructed complex network from the TL signal of the samples are analyzed to understand their variations with optical absorbance. Besides revealing the presence of optimum soot concentration that can enhance photosynthesis,the study brings out the potential application of graph features in nanobiophotonics.

关键词： nanobiophotonics thermal lens soot pigmental energy transfer graph theory

Reflection and transmission of quasi-plane waves at the interface of piezoelectric semiconductors with initial stresses

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Applied Mathematics and Mechanics(English Edition) 2021年第7期42卷 951-968页

作者： s.A.sAHU s.NIRWAL s.MONDAL Department of Mathematics and Computing Indian Institute of Technology(ISM)Dhanbad 826004JharkhandIndia

We examine the reflection and transmission phenomena of quasi-longitudinal plane(QP)waves in an AlN-ZnO laminated composite *** structure is designed under the influence of the initial stresses in which one carrier piezoelectric semiconductor(PsC)half-space is in welded contact with another PsC *** secular equations in the transversely isotropic PsC material are derived from the general dynamic equation,taking the initial stresses into *** is shown that the incident quasi-longitudinal wave(QP-mode)at the interface generates four types of reflected and transmitted waves,namely,QP wave,quasi-transverse(QsV)wave,electric-acoustic(EA)wave,and carrier plane(CP)*** algebraic equations are obtained by imposing the boundary conditions on the common interface of the laminated *** and transmission coefficients of waves are obtained by implementing Cramer’s *** impacts of the initial stresses and exterior electric biasing field on the reflection and transmission coefficients of waves are investigated and presented graphically.

关键词： piezoelectric semiconductor(PsC) electric biasing field normal stress shear stress