检索结果-南通市图书馆

同方期刊数据库

Numerical study of growth competition between twin grains during directional solidification by using multi-phase field method

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2022年第2期31卷 626-633页

作者： chang-Sheng Zhu ting Wang Li Feng Peng Lei Fang-Lan Ma School of Computer and Communication Lanzhou University of TechnologyLanzhou 730050China State Key Laboratory of Gansu Advanced Processing and Recycling of Non-Ferrous Metal Lanzhou University of TechnologyLanzhou 730050China

A multi-phase field model is established to simulate the growth competition and evolution behavior between seaweed and columnar dendrites during directional *** to the effects of surface tension and interfacial energy,we quantitatively analyze the influences of factors such as inclination angles,pulling velocity,and anisotropic strength on twin *** results demonstrate that the pulling velocity and anisotropic strength have an important influence on the morphology and evolution of the seaweed and dendritic *** low pulling velocity and anisotropic strength are both key parameters for maintaining the stable morphology of seaweed during competitive growth in a bicrystal,showing that the lateral branching behavior is the root of the dendrites that can ultimately dominate the *** it is clarified that the lateral branching behavior and lateral blocking are the root causes of the final dominant growth of *** the increase of anisotropy strength,the seaweed is eliminated fastest in case 1,the seaweed is transformed into degenerate dendritic morphology,and eliminates the seaweed by promoting the generation and lateral growth of the lateral branches of the *** increase of pulling velocity is to increase the undercooling of favorable oriented grain and accelerate the growth rate of dendrites,thus producing more new primary dendrites for lateral expansion and accelerating the elimination rate of unfavorable oriented grain.

关键词： multi-phase field simulation grain growth competition directional solidification twin grains

Computed tomography imaging features for amyloid dacryolith in the nasolacrimal excretory system:A case report

在线全文

学校读者我要写书评

暂无评论

World Journal of Clinical Cases 2021年第8期9卷 1940-1945页

作者： Zi-Gang Che ting Ni Zhen-chang Wang De-Wang Wang Department of Radiology Beijing Friendship HospitalCapital Medical UniversityBeijing 100050China Department of Radiology Nanjing Tongren HospitalSoutheast University Medical CollegeNanjing 211102Jiangsu ProvinceChina Department of Pathology Nanjing Tongren HospitalSoutheast University Medical CollegeNanjing 211102Jiangsu ProvinceChina

BACKGROUND Nasolacrimal duct obstruction leading to epiphora is a common ophthalmologic complaint,and it may derive from amyloidosis in rare *** are a few reports about localized amyloidosis,and amyloidosis with involvement and obstruction of the nasolacrimal duct is exceedingly *** SUMMARY A 54-year-old male presented with a 2-year history of a lump overlying the left lacrimal sac that had grown rapidly for nearly half a *** examination touched a firm lump in the left lacrimal *** endoscopy discovered lesions in appearance of sediments with easy bleeding at the entry of the nasolacrimal duct of the left inferior nasal *** tomography scan revealed speckle high density in the left lacrimal sac and the dilated nasolacrimal *** an endoscopic exploration and excision,a large number of dacryoliths were *** indicated amorphous pink material and multinucleated giant cell reaction in the fibrous *** This case showed amyloidosis in localized form mimicking dacryolith with nasolacrimal duct *** clinical practice,we should be aware of the possibility of localized amyloidosis in the nasolacrimal excretory system.

关键词： Amyloidosis Lacrimal sac Nasolacrimal duct obstruction Dacryolith Computed tomography Endoscopy Case report

Theoretical insights into thermal transport and structural stability mechanisms of triaxial compressed methane hydrate

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

Chinese Physics B 2024年第9期33卷 494-504页

作者： Dong-Sheng Chen ting-ting Miao Cheng chang Xu-Yang Guo Meng-Yan Guan and Zhong-Li Ji Beijing Key Laboratory of Process Fluid Filtration and Separation College of Mechanical andTransportation EngineeringChina University of Petroleum-BeijingBeijing 102249China State Key Laboratory of Petroleum Resources and Prospecting China University of Petroleum-BeijingBeijing 102249China

The heat transfer and stability of methane hydrate in reservoirs have a direct impact on the drilling and production efficiency of hydrate resources,especially in complex stress environments caused by formation *** this study,we investigated the thermal transport and structural stability of methane hydrate under triaxial compression using molecular dynamics *** results suggest that the thermal conductivity of methane hydrate increases with increasing compression *** phonon transport mechanisms were identified as factors enhancing thermal *** low compressive strains,a low-frequency phonon transport channel was established due to the overlap of phonon vibration peaks between methane and water *** high compressive strains,the filling of larger phonon bandgaps facilitated the opening of more phonon transport ***,we found that a strain of􀀀0.04 is a watershed point,where methane hydrate transitions from stable to ***,a strain of􀀀0.06 marks the threshold at which the diffusion capacities of methane and water molecules are at their *** a higher strain of􀀀0.08,the increased volume compression reduces the available space,limiting the diffusion ability of water and methane molecules within the *** synergistic effect of the strong diffusion ability and high probability of collision between atoms increases the thermal conductivity of hydrates during the unstable period compared to the stable *** findings offer valuable theoretical insights into the thermal conductivity and stability of methane hydrates in reservoir stress environments.

关键词： methane hydrate molecular dynamics thermal transport triaxial compression structural stability

Corrosion Resistance of Silane-Modified Hydroxide Zinc Carbonate Film on AZ31 Magnesium Alloy

在线全文

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English Letters) 2015年第3期28卷 373-380页

作者： Rong-chang Zeng Li-Jun Liu ting-ting Pang Fen Zhang Wei-Wei Zhang Shuo-Qi Li Hong-Zhi Cui En-Hou Han College of Materials Science and Engineering Shandong University of Science and Technology State Key Laboratory of Mining Disaster Prevention and Control Co-founded by Shandong Province and the Ministry of Science and Technology Shandong University of Science and Technology Institute of Metals Research Chinese Academy of Sciences

The corrosion resistance of magnesium alloys can be improved using functional surface modification such as hydrophobic *** this study,a hierarchical hydroxide zinc carbonate（HZC） film was fabricated on AZ31 magnesium alloy via a simple chemical-bath deposition process using urea aqueous *** morphologies,compositions and corrosion resistance of the hydrophobic film were analyzed using scanning electron microscopy,X-ray diffraction and Fourier transform infrared spectrometer,and electrochemical measurements as *** results revealed that the HZC film displayed flower-like protrusions and had a thickness of approximately 100 *** fluoroalkylsilane（FAS）-modified HZC film exhibited a hydrophobic property with a water contact angle of 131.3°.The FAS/HZC film significantly improved the corrosion resistance of the AZ31 alloy due to hierarchical structures and hydrophobic modification.

关键词： Magnesium alloy Hydrophobicity Silane Surface modification Corrosion

Efficient Coding Unit and Prediction Unit Decision Algorithm for Multiview Video Coding

在线全文

学校读者我要写书评

暂无评论

Journal of Electronic Science and Technology 2015年第2期13卷 97-101页

作者： Wei-Hsiang chang Mei-Juan Chen Gwo-Long Li Yu-ting Chen Department of Electrical Engineering National Dong Hwa University Novatek Microelectronics Corp.

To aim at higher coding efficiency for multiview video coding, the multiview video with a modified high efficiency video coding（MV-HEVC）codec is proposed to encode the dependent ***, the computational complexity of MV-HEVC encoder is also increased significantly since MV-HEVC inherits all computational complexity of HEVC. This paper presents an efficient algorithm for reducing the high computational complexity of MV-HEVC by fast deciding the coding unit during the encoding process. In our proposal, the depth information of the largest coding units（LCUs） from independent view and neighboring LCUs is analyzed first. Afterwards, the analyzed results are used to early determine the depth for dependent view and thus achieve computational complexity reduction. Furthermore, a prediction unit（PU） decision strategy is also proposed to maintain the video quality. Experimental results demonstrate that our algorithm can achieve 57% time saving on average,while maintaining good video quality and bit-rate performance compared with HTM8.0.

关键词： Prediction maintain encoder neighboring proposal similarity encoding deciding saving Probability

Distinct MLT asymmetry of auroral kilometric radiation observed by the FAST satellite

在线全文

学校读者我要写书评

暂无评论

Earth and Planetary Physics 2025年第1期9卷 188-193页

作者： JiaWen Tang Sai Zhang FuLiang Xiao HongMing Yang Si Liu YiHua He chang Yang YuYue Jin ZhouKun Deng Ping Li Archie James Johnston School of Physics and Electronic Sciences Changsha University of Science and TechnologyChangsha 410114China Hunan Province Higher Education Key Laboratory of Modeling and Monitoring on the Near-Earth Electromagnetic Environments Changsha University of Science and TechnologyChangsha 410114China School of Electrical and Information Engineering Changsha University of Science and TechnologyChangsha 410114China

Auroral Kilometric Radiation(AKR)is a common radio emission,which can contribute to the magnetosphere−ionosphere−atmosphere *** emissions have been observed in all magnetic planet magnetospheres of the solar *** this study,using observations from the FAST satellite from 30 August 1996 to 9 September 2001,the distribution of AKR in altitude=500−4500 km and invariant latitude(|ILAT|)=60°−80°has been analyzed.63045 AKR samples have been identified with~48%(52%)samples on the dayside(nightside).Of considerable interest,there is a distinct MLT asymmetry with the high occurrence rate in MLT=05−08 and 18−22(02−05 and 12−17)in the northern(southern)*** distinct MLT asymmetry is associated with the direction of Bxof the interplanetary magnetic *** addition,the occurrence rate on the nightside clearly increases as the index *** study further enriches *** and understanding of AKR in the magnetosphere as well as other similar radio emissions.

关键词： asymmetry auroral kilometric radiation interplanetary magnetic field

Solitary fibrous tumor of the prostate:a case report and 5-year follow-up

在线全文

学校读者我要写书评

暂无评论

Asian Journal of Andrology 2019年第4期21卷 421-422页

作者： Ya-ting Liu Fei-Xue Song Lin Xiang Hong chang Department of Medical Oncology Lanzhou University Second Hospital Lanzhou 730030 China Department of Pathology Lanzhou University Second Hospital Lanzhou 730030 China Department of Urology Lanzhou University Second Hospital Lanzhou 730030 China Institute of Urology Lanzhou University Second Hospital Key Laboratory of Urological Diseases in Gansu Province Gansu Nephro-Urological Clinical Center Lanzhou 730030 China Department of Clinical Laboratory Center The Second Clinical Medical College of Lanzhou University Lanzhou 730030 China

Dear Editor, Solitary fibrous tumors (SFTs) originating from the prostate are extremely rare. The prognosis of patients with SFTs who undergo surgical treatment is good, but aggressive SFTs can recur, so patients should be closely followed up.1 Here, we report a 46-year-old male patient with prostatic SFT who was followed up for 5 years after surgical treatment. This study was approved by the Ethics Committee of Lanzhou University Second Hospital (Lanzhou, China). The patient provided written informed consent.

关键词： Solitary fibrous tumors(SFTs) prostate Ethics Committee

Highly selective photocatalytic oxidation of methane to methyl hydroperoxide

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

Nano Research 2024年第4期17卷 2473-2480页

作者： Chunling Bo Li Zhang Xiaolong Liu Huaiqiu chang Yingxue Sun Xinyi Zhang ting Tan Lingyu Piao National Center for Nanoscience and Technology Beijing 100190China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China University of Chinese Academy of Sciences Beijing 100049China State Key Laboratory of Chemical Resource Engineering Beijing University of Chemical TechnologyBeijing 100029China

Partial oxidation of methane into primary oxidation products with high value remains a *** this work,photocatalytic oxidation of methane(CH_(4))with high methyl hydroperoxide(CH_(3)OOH)selectivity is achieved using pure titanium oxide(TiO_(2))without any cocatalyst at room temperature and atmospheric *** CH_(3)OOH production rate can reach up to 2050±88μmol·g^(-1)·h^(-1) at pH≈7.0 with 100%selectivity in the liquid *** stable reaction cycle can reach more than 30 *** low-cost system achieves superior CH_(4) conversion activity and selectivity compared with similar *** energy of hydrogen peroxide(H_(2)O_(2))to adsorbed hydroperoxyl radical(^(*)OOH)has a significantly lower reaction energy than conversion to adsorbed hydroxyl radical(*OH)on the(210)surface of the TiO_(2).The^(*)OOH preferentially combines with methyl radical(·CH_(3))to form the most energetically favorable CH_(3)*** mild oxidative environment of this system prevents the reduction of CH_(3)OOH to CH_(3)OH or over-oxidation of CH_(4),which ensures the final CH_(3)OOH with high selectivity and *** work provided a low-cost but highly efficient method to achieve partial oxidation with superior selectivity,i.e.,to convert CH_(4) into high-value chemicals.

关键词： photocatalytic methane oxidation methyl hydroperoxide titanium oxide

Pyridine-regulated Sb@InSbS_(3)ultrafine nanoplates as high-capacity and long-cycle anodes for sodium-ion batteries

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

Rare Metals 2024年第5期43卷 2080-2092页

作者： Jia-Ying Ren Xiang-Lin Yu chang-Miao Chen Xin-Yu Hu ting Yang Ming Zhang College of Materials Science and Engineering and College of Science Central South University of Forestry and TechnologyChangsha 410004China College of Semiconductors(College of Integrated Circuits) Changsha Semiconductor Technology and Application Innovation Research InstituteHunan UniversityChangsha 410082China

Sb-based materials exhibit considerable potential for sodium-ion storage owing to their high theoretica ***,the bulk properties of Sb-based materials always result in poor cycling and rate *** overcome these issues,pyridine-regulated Sb@InSbS_(3)ultrafine nanoplates loaded on reduced graphene oxides(Sb@InSbS_(3)@rGO)were designed and *** the synthesis process,pyridine was initially adopted to coordinate with In^(3+),and uniformly dispersed In_(2)S_(3)ultrafine nanoplates on reduced graphene oxide were generated after ***,partial In^(3+)was exchanged with Sb^(3+),and Sb@InSbS_(3)@rGO was obtained by using the subsequent annealing *** unique structure of Sb@InSbS_(3)@rGO effectively shortened the transfer path of sodium ions and electrons and provided a high *** the anode in sodium-ion batteries,the Sb@InSbS_(3)@rGO electrode demonstrated a significantly higher reversible capacity better stability(445 m Ah·g^(-1)at 0.1 A·g^(-1)after 200 cycles and 212 mAh·g^(-1)at 2 A·g^(-1)after 1200 cycles),and superior rate(210 mAh·g^(-1)at 6.4 A·g^(-1))than the electrode without pyridine(355 mAh·g-1at 0.1 A·g-1after 55 cycles and 109 mAh·g^(-1)at 2 A·g^(-1)after 770 cycles)Furthermore,full cells were assembled by using the Sb@InSbS_(3)@rGO as anode and Na_(3)V_(2)(PO_(4))_(3)as cathode which demonstrated good cycling and rate performances and exhibited promising application *** results indicate that adjusting the microstructure of electrode materials through coordination balance is A·good strategy for obtaining high-capacity,high-rate,and longcycle sodium storage performances.

关键词： Sodium-ion battery Sb-based anode material Pyridine coordination Reduced size nanostructure Half/full cell