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Endodontic treatment of the maxillary first molar with palatal canal variations: A case report and review of literature

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World Journal of Clinical Cases 2022年第32期10卷 12036-12044页

作者： Kai Chen xing ran Yan Wang Department of Stomatology Shanghai Tenth People's HospitalTongji University School of MedicineShanghai 200072China Department of Stomatology Shanghai Jiading District Center for Dental Disease Prevention and ControlShanghai 201899China Department of Stomatology Eye and Dental Diseases Prevention&Treatment of Pudong New AreaShanghai 201399China

BACKGROUND Root canal variations frequently occur in maxillary first molars,which greatly affects the success of its *** second mesiobuccal(MB)root canal is the most common root canal ***,only a few studies have been conducted on palatal root canal ***,we report the presence of two separate root canals in a palatal root of the maxillary first *** SUMMARY A 39-year-old woman complained of pain in the maxillary right region for 1 year,which recently *** examination revealed a poorly restored right maxillary first molar and caries detected at the filling *** and heat test results indicated severe pain in the right maxillary first *** patient was diagnosed with irreversible pulpitis,and subsequently,root canal treatment(RCT)was *** total,five root canals were found in the maxillary first molar,including two separate root canals in the palatal *** was successfully performed using an endodontic microscope and cone-beam computed tomography(CBCT).The CBCT image revealed a vertucci type I canal morphology in the distobuccal root,while the MB and palatal root canals were typeⅣ.At the 1-mo follow-up,the maxillary first molar was completely asy-mptomatic,and the X-ray results indicated a successful ***,the ceramic crown restoration was *** An endodontic microscope and CBCT are useful in effectively identifying and treating root canal variations.

关键词： Molar Root canal Endodontics Dental pulp cavity Pulpitis Case report

Template-free Synthesis of a Novel 3D Cage-like Nanostructured α-Fe_2O_3

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Chemical Research in Chinese Universities 2009年第6期25卷 963-965页

作者： YU ran-bo LI Zhen-min WANG Dan xing Chao-jian LAI Xiao-yong xing Xian-ran Department of Physical Chemistry University of Science and Technology Beijing Beijing 100083 P. R. China State Key Laboratory of Multi-phase Complex System Institute of Process Engineering Chinese Academy of Sciences Beijing 100190 P. R. China Key Laboratory of Ecologic ＆ Recycle Metallurgy Ministry of Education University of Science and Technology Beijing Beijing 100083 P. R. China

Synthesis of inorganic nanostructures with specific size and well defined morphologies has attracted considerable attention due to their superior electrical, optical, magnetic, and chemical properties. Up to now, various kinds of metal oxide, sulfide, and hydrate with controlled hierarchical and complex morphologies have been successfully synthesized.

关键词： Template-free α-Fe2O3 Nanostructure

An improved ROF denoising model based on time-fractional derivative

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Frontiers of Information Technology & Electronic Engineering 2020年第6期21卷 856-865页

作者： xing-ran LIAO School of Mathematics Sichuan UniversityChengdu 610065China

In this study,we discuss mainly the image denoising and texture retention ***,the time-fractional derivative has an adjustable fractional order to control the diffusion process,and its memory effect can nicely retain the image texture when it is applied to image ***,we design a new Rudin-Osher-Fatemi model with a time-fractional derivative based on a classical one,where the discretization in space is based on the integer-order difference scheme and the discretization in time is the approximation of the Caputo derivative(i.e.,Caputo-like difference is applied to discretize the Caputo derivative).Stability and convergence of such an explicit scheme are analyzed in *** prove that the numerical solution to the new model converges to the exact solution with the order of O(τ^2−α+h^2),whereτ,α,and h are the time step size,fractional order,and space step size,re***,various evaluation criteria including the signal-to-noise ratio,feature similarity,and histogram recovery degree are used to evaluate the performance of our new *** test results show that our improved model has more powerful denoising and texture retention ability than existing ones.

关键词： Improved ROF denoising model Time-fractional derivative Caputo derivative Image denoising

Relevance of macrophages in the wound healing process among individuals afflicted with diabetic foot ulcers

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World Journal of Diabetes 2024年第12期15卷 2384-2386页

作者： Li-Hong Chen xing-Wu ran Department of Endocrinology&Metabolism West China HospitalSichuan UniversityChengdu 610041Sichuan ProvinceChina Innovation Research Center for Diabetic Foot Diabetic Foot Care CenterWest China HospitalSichuan UniversityChengdu 610041Sichuan ProvinceChina

In this paper,we provide a commentary on an article focusing on diabetic foot ulcer(DFU)as a dreadful complication of diabetes *** development of this condition is influenced by factors such as diabetic peripheral neuropathy,lower extremity artery disease,and ***,the underlying mecha-nism remains *** play a critical role in wound healing proce-sses,suggesting that therapies targeting these cells could potentially improve the management of DFU.A comprehensive understanding of developmental trends of macrophages within the field of DFU may facilitate research advancements and the development of novel treatment strategies.

关键词： Diabetic foot ulcer Macrophages Immune regulation Wound healing Bibliometrics

Application of transparent casting moulds prepared by additive manufacturing technology in hydraulic simulation

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China Foundry 2022年第4期19卷 299-306页

作者： Qian Feng xing ran Ke-hui Hu Hao-yuan Wang Zhi-gang Lü State Key Laboratory of Tribology Tsinghua UniversityBeijing 100084China Department of Mechanical Engineering Tsinghua UniversityBeijing 100084China AVIC Heavy Machinery Co. Ltd.Guiyang 550005China Key Laboratory of Advanced Materials Processing Technology Ministry of EducationTsinghua UniversityBeijing 100084China

Hydraulic simulation is one of the critical methods to research the filling mechanism of molten metal in the casting ***,it only performs on test pieces with relatively simple structures due to the limitation of the preparation *** this study,the method of photocuring additive manufacturing was used to prepare the complex casting mould from transparent photosensitive *** pouring test was carried out under different centrifugal conditions,and the filling process of the gating system,support bars and other positions in the vertical direction was recorded and *** experimental results show that the internal liquid level and the filling process of the test piece prepared by this method can be observed *** angle between the liquid surface and the horizontal plane in the test piece gradually increases as the centrifugal rotational speed increases,which means the filling process is carried out from outside to inside at high rotational *** velocity of the fluid entering the runner increases with the increase of rotational speed,but the filling speeds is less affected by the centrifugal speed at other *** liquid flow is continuous and stable during the forward filling process,without splashing or interruption of liquid droplets.

关键词： additive manufacturing centrifugal casting investment casting hydraulic simulation transparent mould

TWO-LAYER MODEL DESCRIPTION OF POLYMER THIN FILM DYNAMICS

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Chinese Journal of Polymer Science 2013年第1期31卷 12-20页

作者： Dong-dong Peng ran-xing Nancy Li Chi-hang Lam Ophelia K.C.Tsui Department of Physics Boston University Department of Applied Physics Hong Kong Polytechnic University

Experiments in the past two decades have shown that the glass transition temperature of polymer films can become noticeably different from that of the bulk when the film thickness is decreased below ca. 100 nm. It is broadly believed that these observations are caused by a nanometer interfacial layer with dynamics faster or slower than that of the bulk. In this paper, we examine how this idea may be realized by using a two-layer model assuming a hydrodynamic coupling between the interfacial layer and the remaining, bulk-like layer in the film. Illustrative examples will be given showing how the two-layer model is applied to the viscosity measurements of polystyrene and polymethylmethacrylate films supported by silicon oxide, where divergent thickness dependences are observed.

关键词： Polymer films Glass transition Viscosity.

Spatiotemporal Characteristics of Atmospheric Brown Carbon Emis-sion from Combustion Sources in China

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Chinese Geographical Science 2024年第6期34卷 993-1003页

作者： OUYANG Shuyu JIANG Ke XIONG Rui MEN Yatai LUO Zhihan xing ran SHEN Guofeng College of Urban and Environmental Sciences Peking UniversityBeijing 100871China College of Ecology and Environment Zhengzhou UniversityHenan 450001China Institute of Carbon Neutrality Peking UniversityBeijing 100871China

Atmospheric Brown Carbon(BrC)with strong wavelength-dependence light-absorption ability can significantly affect radiative *** resolved emission inventories with lower uncertainties are important premise and essential in scientifically evaluating impacts of emissions on air quality,human health and climate *** study developed a bottom-up inventory of primary BrC from combustion sources in China from 1960 to 2016 with a spatial resolution at 0.1°×0.1,based on compiled emission factors and detailed activity *** primary BrC emission in China was about 593 Gg(500-735 Gg as interquartile range)in 2016,contributing to 7%(5%-8%)of a previously estimated global total BrC *** fuel combustion was the largest source of primary BrC in China,with the contribution of 67%as the national average but ranging from 25%to 99%among different provincial ***-ficant spatial disparities were also observed in the relative shares of different fuel *** combustion contribution varied from 8%to 99%across different *** and North China Plain had high emissions of primary ***,on the national scale,spatial distribution of BrC emission density per area was aligned with the population *** BrC emission from combustion sources in China have been declined since a peak of~1300 Gg in 1980,but the temporal trends were distinct in different *** high-resolution inventory developed here enables radiative forcing simulations in future atmospheric models so as to promote better understanding of carbonaceous aerosol impacts in the Earth's climate system and to develop strategies achieving co-benefits of hu-man health protection and climate change.

关键词： atmospheric brown carbon(BrC) emission estimate driving factors high-resolution inventory source contribution China

A Novel Impact Tension Testing for OFHC Copper Bars under Local Strain Controlled

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Chinese Physics Letters 2011年第1期28卷 156-159页

作者： MA Dong-Fang HOU Yan-Jun CHEN Da-Nian WU Shan-xing WANG Huan-ran Mechanics and Materials Science Research Center Ningbo University Ningbo 315211

A novel high-speed tensile facility （HSTF） with special fixture is applied to research the dynamic failure char- acteristics of oxygen-free higfl-conductivity （OFHC） copper bars at different levels of strain. The experimental tests are numerically simulated involving void evolution, It is indicated that the localized strains at necking region computed with the adjusted Johnson Cook model and the Zerilli Armstrong model are consistent with the experimental results.

关键词： Condensed matter: structural mechanical & thermal

A new panaxadiol from the acid hydrolysate of Panax ginseng

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Chinese Chemical Letters 2009年第6期20卷 687-689页

作者： Li Na Tao Qin Meng Jian Yuan Yin Rui xing Hao ran Guo Department of Traditional Chinese Medicinal Chemistry Pharmacy College Jilin University Changchun 130021 China

A new panaxadiol （compound 1） was obtained from the acid hydrolysate of the total ginsenosides of Panax ginseng C. A. Meyer （Araliaceae）. On the basis of spectroscopic data and single-crystal X-ray diffraction dat... 详细信息

关键词： Panax ginseng Ginsenoside Acid hydrolysate