期刊文献+
共找到17篇文章
< 1 >
每页显示 20 50 100
Formation mechanism of a smooth, defectfree surface of fused silica optics using rapid CO2 laser polishing 被引量:14
1
作者 Linjie Zhao Jian Cheng +5 位作者 Mingjun Chen Xiaodong Yuan Wei Liao Qi Liu Hao Yang Haijun Wang 《International Journal of Extreme Manufacturing》 2019年第3期85-95,共11页
Surface defects introduced by conventional mechanical processing methods can induce irreversible damage and reduce the service life of optics applied in high-power lasers.Compared to mechanical processing,laser polish... Surface defects introduced by conventional mechanical processing methods can induce irreversible damage and reduce the service life of optics applied in high-power lasers.Compared to mechanical processing,laser polishing with moving beam spot is a noncontact processing method,which is able to form a defect-free surface.This work aims to explore the mechanism of forming a smooth,defect-free fused silica surface by high-power density laser polishing with coupled multiple beams.The underlying mechanisms of laser polishing was revealed by numerical simulations and the theoretical results were verified by experiments.The simulated polishing depth and machined surface morphology were in close agreement with the experimental results.To obtain the optimized polishing quality,the effects of laser polishing parameters(e.g.overlap rate,pulse width and polishing times)on the polishing quality were experimentally investigated.It was found that the processing efficiency of fused silica materials by carbon dioxide(CO2)laser polishing could reach 8.68 mm2 s−1,and the surface roughness(Ra)was better than 25 nm.Besides,the cracks on pristine fused silica surfaces introduced by initial grinding process were completely removed by laser polishing to achieve a defect-free surface.The maximum laser polishing rate can reach 3.88μm s−1,much higher than that of the traditional mechanical polishing methods.The rapid CO2 laser polishing can effectively achieve smooth,defect-free surface,which is of great significance to improve the surface quality of fused silica optics applied in high-power laser facilities. 展开更多
关键词 laser polishing mechanical processing smooth surface defect-free surface polishing rate
下载PDF
Epithelial cell adhesion efficacy of a novel peptide identified by panning on a smooth titanium surface 被引量:2
2
作者 Hidemichi Kihara David M.Kim +7 位作者 Masazumi Nagai Toshiki Nojiri Shigemi Nagai Chia-Yu Chen Cliff Lee Wataru Hatakeyama Hisatomo Kondo John Da Silva 《International Journal of Oral Science》 SCIE CAS CSCD 2018年第3期174-181,共8页
Epithelial attachment via the basal lamina on the tooth surface provides an important structural defence mechanism against bacterial invasion in combating periodontal disease. However, when considering dental implants... Epithelial attachment via the basal lamina on the tooth surface provides an important structural defence mechanism against bacterial invasion in combating periodontal disease. However, when considering dental implants, strong epithelial attachment does not exist throughout the titanium-soft tissue interface, making soft tissues more susceptible to peri-implant disease. This study introduced a novel synthetic peptide(A10) to enhance epithelial attachment. A10 was identified from a bacterial peptide display library and synthesized. A10 and protease-activated receptor 4-activating peptide(PAR4-AP, positive control) were immobilized on commercially pure titanium. The peptide-treated titanium showed high epithelial cell migration ability during incubation in platelet-rich plasma. We confirmed the development of dense and expanded BL(stained by Ln5) with pericellular junctions(stained by ZO1) on the peptide-treated titanium surface. In an adhesion assay of epithelial cells on A10-treated titanium, PAR4-AP-treated titanium, bovine root and non-treated titanium, A10-treated titanium and PAR4-AP-treated titanium showed significantly stronger adhesion than non-treated titanium. PAR4-AP-treated titanium showed significantly higher inflammatory cytokine release than non-treated titanium. There was no significant difference in inflammatory cytokine release between A10-treated and non-treated titanium. These results indicated that A10 could induce the adhesion and migration of epithelial cells with low inflammatory cytokine release. This novel peptide has a potentially useful application that could improve clinical outcomes with titanium implants and abutments by reducing or preventing peri-implant disease. 展开更多
关键词 PAR OBA Epithelial cell adhesion efficacy of a novel peptide identified by panning on a smooth titanium surface AP
下载PDF
Micro-Mechanism of Silicon-Based Waveguide Surface Smoothing in Hydrogen Annealing 被引量:1
3
作者 段倩倩 任馨宇 +5 位作者 菅傲群 张辉 冀健龙 张强 张文栋 桑胜波 《Chinese Physics Letters》 SCIE CAS CSCD 2016年第12期110-114,共5页
The micro-mechanism of the silicon-based waveguide surface smoothing is investigated systematically to explore the effects of silicon-hydrogen bonds on high-temperature hydrogen annealing waveguides. The effect of sil... The micro-mechanism of the silicon-based waveguide surface smoothing is investigated systematically to explore the effects of silicon-hydrogen bonds on high-temperature hydrogen annealing waveguides. The effect of silicon- hydrogen bonds on the surface migration movement of silicon atoms and the waveguide surface topography are revealed. The micro-migration from an upper state to a lower state of silicon atoms is driven by silicon- hydrogen bonding, which is the key to ameliorate the rough surface morphology of the silicon-based waveguide. The process of hydrogen annealing is experimentally validated based on the simulated parameters. The surface roughness declines from 1.523nm to 0.461 nm. 展开更多
关键词 of on Micro-Mechanism of Silicon-Based Waveguide surface smoothing in Hydrogen Annealing in IS
原文传递
Improvement in Surface Roughness and Hardness for Carbon Steel by Slide Burnishing Process
4
作者 Hirotaka Kato Wataru Hirokawa +1 位作者 Yoshikazu Todaka Kazufumi Yasunaga 《Materials Sciences and Applications》 2021年第5期171-181,共11页
Slide burnishing process, which is a surface severe plastic deformation technique, offers an attractive post-machining alternative due to its chip-less and relatively simple operations. The purpose of the present work... Slide burnishing process, which is a surface severe plastic deformation technique, offers an attractive post-machining alternative due to its chip-less and relatively simple operations. The purpose of the present work is to investigate effects of initial turned surface roughness on the burnished surface roughness and hardness in slide burnishing. The carbon steel samples those have different roughness surfaces being treated were prepared by turning by varying the feed. Slide burnishing was then carried out by a silicon nitride ceramic ball that was loaded and fed on the turned surface of a rotating specimen using a lathe machine. It was found that the turned surfaces were smoothed drastically by the burnishing process, and that the Ra and Rz values were reduced at most by a factor of 52 and 21, respectively. However, the smoothing effect of burnishing has limit, and the limited maximum height roughness (Rz*) for burnishing smoothing increased under a higher burnishing force and with a larger ball diameter. When the Rz values of initial turned surfaces were less than the Rz*, the roughness of the burnished surfaces did not depend on the roughness of the initial turned surface and the burnishing force. There was no significant difference in the burnished microstructure and hardness under a specific burnishing force among the initial turned surface roughness, while a higher burnishing force caused a greater increase in surface hardness. 展开更多
关键词 BURNISHING TURNING surface smoothing ROUGHNESS HARDNESS Carbon Steel
下载PDF
Finite Abelian Groups of K3 Surfaces with Smooth Quotient
5
作者 Taro HAYASHI 《Chinese Annals of Mathematics,Series B》 SCIE CSCD 2023年第1期99-162,共64页
The quotient space of a K3 surface by a finite group is an Enriques surface or a rational surface if it is smooth.Finite groups where the quotient space are Enriques surfaces are known.In this paper,by analyzing effec... The quotient space of a K3 surface by a finite group is an Enriques surface or a rational surface if it is smooth.Finite groups where the quotient space are Enriques surfaces are known.In this paper,by analyzing effective divisors on smooth rational surfaces,the author will study finite groups which act faithfully on K3 surfaces such that the quotient space are smooth.In particular,he will completely determine effective divisors on Hirzebruch surfaces such that there is a finite Abelian cover from a K3 surface to a Hirzebrunch surface such that the branch divisor is that effective divisor.Furthermore,he will decide the Galois group and give the way to construct that Abelian cover from an effective divisor on a Hirzebruch surface.Subsequently,he studies the same theme for Enriques surfaces. 展开更多
关键词 K3 surface Finite Abelian group Abelian cover of a smooth rational surface
原文传递
High-quality micro-shape fabrication of monocrystalline diamond by nanosecond pulsed laser and acid cleaning 被引量:2
6
作者 Yasuhiro Okamoto Tubasa Okubo +1 位作者 Atsuya Kajitani Akira Okada 《International Journal of Extreme Manufacturing》 SCIE EI 2022年第2期173-183,共11页
The flat plane of small surface roughness below 0.1μm average roughness was obtained for monocrystalline diamond by nanosecond pulsed laser irradiation of 1060 nm and post-process acid cleaning,at a laser fluence aro... The flat plane of small surface roughness below 0.1μm average roughness was obtained for monocrystalline diamond by nanosecond pulsed laser irradiation of 1060 nm and post-process acid cleaning,at a laser fluence around the material removal threshold value.The glossy and flat plane at the bottom of the micro-groove was parallel to the top surface of the specimen,although the round beam of Gaussian mode was irradiated in the direction perpendicular to the top surface of specimen.The square beam of top-hat mode produced a shallower micro-groove with a wider,flatter bottom compared with the round beam in Gaussian mode.The creation method of the flat plane with small surface roughness was discussed in the arrangement strategy of linear micro-grooving by the square beam of top-hat mode.Normal side-by-side repetition of linear micro-grooving did not create a flat plane with constant depth.Therefore,a two-step scanning method was proposed in order to overcome the problem in the normal side-by-side repetition of liner micro-grooving.Non-removal areas were partly retained between the processing lines in the first step,and the laser scanning was conducted on the retained area in the second step.The newly proposed two-step scanning method was practical and useful to create a widely flat plane with small surface roughness,and the two-step scanning method provided superior control over the micro-groove depth.This proposed method can reduce the surface roughness in addition to the shape creation of monocrystalline diamond,and it can be used as a high-quality micro-shape fabrication method of monocrystalline diamond. 展开更多
关键词 monocrystalline diamond nanosecond pulsed laser flat surface smooth surface micro-grooving
下载PDF
Optimized Design for the Plow of a Submarine Plowing Trencher 被引量:1
7
作者 Hanyang Gong Ruhua Yuan +3 位作者 Xiaodong Xing Liquan Wang Zhipeng Wang Haixia Gong 《Journal of Marine Science and Application》 2013年第1期98-105,共8页
The plow of the submarine plowing trencher is one of the main functional mechanisms, and its optimization is very important. The design parameters play a very significant role in determining the requirements of the to... The plow of the submarine plowing trencher is one of the main functional mechanisms, and its optimization is very important. The design parameters play a very significant role in determining the requirements of the towing force of a vessel. A multi-objective genetic algorithm based on analytical models of the plow surface has been examined and applied in efforts to obtain optimal design of the plow. For a specific soil condition, the draft force and moldboard surface area which are the key parameters in the working process of the plow are optimized by finding the corresponding optimal values of the plow blade penetration angle and two surface angles of the main cutting blade of the plow. Parameters such as the moldboard side angle of deviation, moldboard lift angle, angular variation of the tangent line, and the spanning length are also analyzed with respect to the force of the moldboard surface along soil flow direction. Results show that the optimized plow has an improved plow performance. The draft forces of the main cutting blade and the moldboard are 10.6% and 7%, respectively, less than the original design. The standard deviation of Gaussian curvature of moldboard is lowered by 64.5%, which implies that the smoothness of the optimized moldboard surface is much greater than the original. 展开更多
关键词 submarine plowing trencher moldboard surface plow surface optimized design multi-objective genetic algorithm surface smoothness
下载PDF
Globally generated vector bundles on a smooth quadric surface
8
作者 BALLICO Edoardo HUH Sukmoon MALASPINA Francesco 《Science China Mathematics》 SCIE CSCD 2015年第3期633-652,共20页
We give the classification of globally generated vector bundles of rank 2 on a smooth quadric surface with c1(2,2)in terms of the indices of the bundles,and extend the result to arbitrary higher rank case.We also inve... We give the classification of globally generated vector bundles of rank 2 on a smooth quadric surface with c1(2,2)in terms of the indices of the bundles,and extend the result to arbitrary higher rank case.We also investigate their indecomposability and give the sufficient and necessary condition on numeric data of vector bundles for indecomposability. 展开更多
关键词 higher rank vector bundles globally generated smooth quadric surface
原文传递
Dust Retention Ability of Plants as a Factor Improving Environment Air
9
作者 Tazhimamat Erkebaev Kursantbek Attokurov +6 位作者 Absamat Sattarov Minavar Shaimkulova Nurgazy Orozaliev Tashbolot Erkebaev Elida Topchubaeva Nurgul Kaparova Zhypargul Abdullaeva 《American Journal of Plant Sciences》 2021年第2期187-198,共12页
It is well known that air in industrial cities contains a significant amount of dust particles, smoke, and toxic gases. The increased number of vehicles has a direct impact on air quality resulting in the emission of ... It is well known that air in industrial cities contains a significant amount of dust particles, smoke, and toxic gases. The increased number of vehicles has a direct impact on air quality resulting in the emission of exhaust gases, and the increase of dust concentration in air. In this article, we are describing the dust retention ability of plants depending on their leaf structure. Plant species were classified into three groups according to their dust-holding capacities. Dust retaining ability of plant species in conditions of high, average and low dust conditions described. 展开更多
关键词 Dust Retention Leaf Morphological Structure Rough Leaf surface smooth Leaf surface High Dust Retention Capacity Average Dust Retention Low Dust Retention Capacity
下载PDF
Dark-field detection method of shallow scratches on the super-smooth optical surface based on the technology of adaptive smoothing and morphological differencing 被引量:2
10
作者 李晨 杨甬英 +9 位作者 柴惠婷 张毅晖 吴凡 周林 闫凯 白剑 沈亦兵 许乔 姜宏振 刘旭 《Chinese Optics Letters》 SCIE EI CAS CSCD 2017年第8期53-57,共5页
In recent years, modern optical processing technologies, such as single point diamond turning, ion beam etching, and magneto-theological finishing, arc getting break- throughs. Machining precisions of super-smooth opt... In recent years, modern optical processing technologies, such as single point diamond turning, ion beam etching, and magneto-theological finishing, arc getting break- throughs. Machining precisions of super-smooth optics have also been significantly improved. However, with increasing demands for the optical surface quality, 展开更多
关键词 Dark-field detection method of shallow scratches on the super-smooth optical surface based on the technology of adaptive smoothing and morphological differencing
原文传递
On Differential Equations of Integrable Billiard Tables
11
作者 Vladimir DRAGOVIC Andrey E.MIRONOV 《Acta Mathematica Sinica,English Series》 SCIE CSCD 2024年第1期417-424,共8页
We introduce a method to find differential equations for functions which define tables,such that associated billiard systems admit a local first integral.We illustrate this method in three situations:the case of(local... We introduce a method to find differential equations for functions which define tables,such that associated billiard systems admit a local first integral.We illustrate this method in three situations:the case of(locally)integrable wire billiards,for finding surfaces in R^(3)with a first integral of degree one in velocities,and for finding a piece-wise smooth surface in R^(3)homeomorphic to a torus,being a table of a billiard admitting two additional first integrals. 展开更多
关键词 Polynomial first integrals wire billiards piece-wise smooth surfaces
原文传递
Mode transition from adsorption removal to bombardment removal induced by nanoparticle-surface collisions in fluid jet polishing 被引量:5
12
作者 Xuechu ZHAO Liran MA Xuefeng XU 《Friction》 SCIE EI CAS CSCD 2021年第5期1127-1137,共11页
The effects of impacting particles from a jet of liquid on the removal of a surface material(on the impacted workpiece)were investigated.Experimental observations show that the cross section of the material removed ch... The effects of impacting particles from a jet of liquid on the removal of a surface material(on the impacted workpiece)were investigated.Experimental observations show that the cross section of the material removed changed fromʹWʹ‐shaped toʹUʹ‐shaped as the size of abrasive particles was increased.Comparisons between removed material profiles and particle collision distributions indicate that the particle-surface collisions are the main reason for the material removal.The deduced number of atoms removed by a single collision implies that a transition occurs in the removal mode.For nanoscale particles,the polished surface is likely to be removed in an atom‐by‐atom manner,possibly due to the chemisorption of the impacting particles on the impacted surface.Contrarily,for the case of microscale particles,bulk material removal produced by particle bombardment is more likely to occur.The present mechanism of material removal for particle-surface collisions is further corroborated experimentally. 展开更多
关键词 ultra‐smooth surface fluid jet polishing nanoparticle-surface collision material removal
原文传递
LOCAL ISOMETRIC EMBEDDINGS OF SURFACES INTO A 3-SPACE
13
作者 DINGQING ZHANGYONGQIAN 《Chinese Annals of Mathematics,Series B》 SCIE CSCD 1999年第2期215-222,共8页
In the paper, the authors show that any abstract smooth surface can be locally isometricallyembedded into a class of 3-dimensional spaces Nρ0 (ρ0>0) with the non-positively sectionalcurvature being fixed sufficie... In the paper, the authors show that any abstract smooth surface can be locally isometricallyembedded into a class of 3-dimensional spaces Nρ0 (ρ0>0) with the non-positively sectionalcurvature being fixed sufficiently small. 展开更多
关键词 Local isometric embeddings smooth surface CURVATURE
原文传递
Study on influence of key blasthole parameters on tunnel overbreak 被引量:1
14
作者 Zi-qiang Li Zheng Li +2 位作者 Wei-wei Huang Xuan-ming Ding Hang Zhang 《Underground Space》 SCIE EI CSCD 2023年第2期76-90,共15页
To determine the influence of key blasthole parameters on tunnel overbreak during blasting construction,an intelligent detection sys-tem for tunnel blasting construction is independently developed.And the key blasthol... To determine the influence of key blasthole parameters on tunnel overbreak during blasting construction,an intelligent detection sys-tem for tunnel blasting construction is independently developed.And the key blasthole parameters and overbreak of a typical section of a single line tunnel under the condition of Class V surrounding rock are analyzed and detected.The actual data obtained is compared with the results of numerical simulations and theoretical calculations.The results are as follows:(1)Quantitative analysis is performed based on the blasthole angle,opening position,and charge mass by the self-developed intelligent detection equipment for blasthole parameters,which can be used to guide the drilling construction.Intelligent scanning equipment for outline excavation can be used to image the actual excavation section in real-time and has the advantages of high precision and fast speed;(2)Tunnel overbreak can be regarded as consisting of two parts:the surrounding rock damage caused by the blasting load,and the collapse of the surrounding rock caused by the blasthole opening position.Every parameter of the peripheral hole will affect the tunnel overbreak;however,the key parameter is the blasthole opening position;(3)The distributions of the tunnel overbreak volume obtained with the theoretical analysis,finite element simulation,and measurements are basically consistent.Under the condition of Class V surrounding rock,the overbreak of this single line tunnel can reach 14.1–78.2 cm.To meet the specification requirements,the opening position and construction accuracy of the peripheral hole should be strictly controlled. 展开更多
关键词 Tunnel blasting Blasthole parameters Tunnel overbreak Surrounding rock damage smooth surface blasting
下载PDF
Influence of Scanning Patterns on Mechanical Behavior and Distortion in Laser Directed Energy Deposition
15
作者 Qi Wang Bingjie Xiao Shaopeng Zheng 《Journal of Applied Mathematics and Physics》 2024年第11期3842-3859,共18页
Laser Directed Energy Deposition (LDED) marks a critical advance in intelligent manufacturing, enabling efficient near-net shape production of metal parts. This method is especially beneficial for aerospace and defens... Laser Directed Energy Deposition (LDED) marks a critical advance in intelligent manufacturing, enabling efficient near-net shape production of metal parts. This method is especially beneficial for aerospace and defense applications that require high precision. However, issues such as deformation and heat accumulation during production still affect the quality of the final products, necessitating further optimization of process parameters. This paper studies the effects of three deposition strategies on 316L stainless steel parts using LDED. The three strategies based on unidirectional scanning (US), zigzag scanning (ZS), and square spiral scanning (SS) are investigated by solid samples and samples with a central hole. The surface smoothness, defects, and mechanical properties of 316L samples manufactured with the above strategies are discussed by means of surface topography tests and metallographic characterization. Experimental results indicate that the zigzag scanning strategy yielded better results for solid components, and the square spiral scanning strategy is suitable for samples with a central hole. 展开更多
关键词 Directed Energy Deposition Deposition Strategy 316L Stainless Steel Microstructure Microhardness surface smoothness
下载PDF
Oscillating friction of nanoscale capillary bridge
16
作者 Shuai WU Yuqing HE +1 位作者 Quanshui ZHENG Ming MA 《Friction》 SCIE EI CAS CSCD 2022年第2期200-208,共9页
The presence of a capillary bridge between solid surfaces is ubiquitous under ambient conditions.Usually,it leads to a continuous decrease of friction as a function of bridge height.Here,using molecular dynamics we sh... The presence of a capillary bridge between solid surfaces is ubiquitous under ambient conditions.Usually,it leads to a continuous decrease of friction as a function of bridge height.Here,using molecular dynamics we show that for a capillary bridge with a small radius confined between two hydrophilic elastic solid surfaces,the friction oscillates greatly when decreasing the bridge height.The underlying mechanism is revealed to be a periodic ordered-disordered transition at the liquid–solid interfaces.This transition is caused by the balance between the surface tension of the liquid–vapor interface and the elasticity of the surface.This balance introduces a critical size below which the friction oscillates.Based on the mechanism revealed,a parameter-free analytical model for the oscillating friction was derived and found to be in excellent agreement with the simulation results.Our results describe an interesting frictional phenomenon at the nanoscale,which is most prominent for layered materials. 展开更多
关键词 capillary bridge nano-confinement ELASTICITY atomically smooth surface
原文传递
A manifold approach to generating iso-scallop trajectories in three-axis machining 被引量:2
17
作者 CHEN XuBing LI WenLong XIONG YouLun 《Science China(Technological Sciences)》 SCIE EI CAS 2011年第1期131-139,共9页
A novel approach of iso-scallop trajectory generation for smooth manifold surfaces has been developed. Firstly,by defining homeomorphism mapping relations and differentiable structures,the smooth manifold surface is m... A novel approach of iso-scallop trajectory generation for smooth manifold surfaces has been developed. Firstly,by defining homeomorphism mapping relations and differentiable structures,the smooth manifold surface is mapped into several Euclidean planes,thus its trajectory generation can be decomposed into planar curve-filling tasks. Secondly,in the generation of direction-parallel trajectories,the calculation of the cutting interval and the curvature is given,depending on the generation of the first curve in the projection view. Thirdly,after automatic adherences of inverse projection curves,the filled curves are mapped into the original surface inversely to form trajectories. Although the required trajectories are iso-scallop,the trajectory intervals are variable according to the curvature changes at the projection point,which is advantageous to improving the trajectory quality. The proposed approach has appealing merits of dimensionality reduction,which decreases the algorithm complexity. Finally,numerical and machining examples are given to illustrate its feasibility and validity. 展开更多
关键词 smooth manifold surface iso-scallop trajectory three-axis machining homeomorphism mapping REGULARITY
原文传递
上一页 1 下一页 到第
使用帮助 返回顶部