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Influence of Particle Size on Laser Absorption and Scanning Track Formation Mechanisms of Pure Tungsten Powder during Selective Laser Melting Article

Jiayao Zhang, Dongdong Gu, Ying Yang, Hongmei Zhang, Hongyu Chen, Donghuai Dai, Kaijie Lin

Engineering 2019, Volume 5, Issue 4,   Pages 736-745 doi: 10.1016/j.eng.2019.07.003

Abstract:

A three-dimensional laser absorption model based on ray tracing was established to describe the coupledThis work provides a scientific basis for the application of the ray-tracing model to predict the wetting

Keywords： Selective laser melting (SLM)     Tungsten     Ray-tracing model     Absorptivity     Laser scanning tracks    

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Ray-triangular Bézier patch intersection using hybrid clipping algorithm Article

Yan-hong LIU,Juan CAO,Zhong-gui CHEN,Xiao-ming ZENG

Frontiers of Information Technology & Electronic Engineering 2016, Volume 17, Issue 10,   Pages 1018-1030 doi: 10.1631/FITEE.1500390

Abstract: we present a novel geometric method for efficiently and robustly computing intersections between a rayIf the ray pierces the patch only once, we locate the parametric value of the intersection to a smallerWhen the ray intersects the patch more than once, Descartes’ rule of signs and a split step are requiredExperiments have been conducted to illustrate the efficacy of our method in solving ray-triangular Bézier

Keywords： Ray tracing     Triangular Bé     zier surface     Ray-patch intersection     Root-finding     Hybrid clipping    

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Machine learning based altitude-dependent empirical LoS probability model for air-to-ground communications Research Article

Minghui PANG, Qiuming ZHU, Zhipeng LIN, Fei BAI, Yue TIAN, Zhuo LI, Xiaomin CHEN

Frontiers of Information Technology & Electronic Engineering 2022, Volume 23, Issue 9,   Pages 1378-1389 doi: 10.1631/FITEE.2200041

Abstract: This paper presents an altitude-dependent empirical LoS probability model for A2G scenarios.Before estimating the model parameters, we design a K-nearest neighbor (KNN) based strategy to classifynetwork (BPNN) based parameter estimation method is developed to build the relationship between every modelSimulation results show that the results obtained using our proposed model has good consistency withOur model can also provide wider applicable altitudes than other LoS probability models, and thus can

Keywords： Line-of-sight probability model     Air-to-ground channel     Machine learning     Ray tracing    

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Optical performance analysis of an innovative linear focus secondary trough solar concentrating system

Xiliang ZHANG, Zhiying CUI, Jianhan ZHANG, Fengwu BAI, Zhifeng WANG

Frontiers in Energy 2019, Volume 13, Issue 3,   Pages 590-596 doi: 10.1007/s11708-018-0602-y

Abstract: performance of the semi and the whole secondary solar trough concentrator was evaluated by using the raytracing method.

Keywords： secondary parabolic trough solar concentrator     ray tracing method     linear focus     concentration ratio     optical    

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Early Identification of Abnormal Regions in Rock-Mass Using Traveltime Tomography Article

Longjun Dong,Zhongwei Pei,Xin Xie,Yihan Zhang,Xianhang Yan

Engineering 2023, Volume 22, Issue 3,   Pages 191-200 doi: 10.1016/j.eng.2022.05.016

Abstract:

Early identification of abnormal regions is crucial in preventing the occurrence of underground geotechnical disasters. To meet the high-accuracy detection requirements of underground engineering, this paper proposes a tomography method for abnormal region identification in complex rock-mass structures that utilizes traveltime tomography combined with the damped least-squares method and Gaussian filtering. The proposed method overcomes the limitation of velocity difference in empty region detection and mitigates the impact from isolated velocity mutation in the iteration. Numerical and laboratory experiments were conducted to evaluate the identification accuracy and computational efficiency of forward modeling, including the shortest-path method (SPM), dynamic SPM (DSPM), and fast sweeping method (FSM). The results show that DSPM and FSM can clearly detect abnormal regions in numerical and laboratory experiments. Field experiments were conducted in the Shaanxi Zhènào mine and achieve the reconstruction of the underground roadway distribution. This paper not only realizes the application of abnormal region identification using traveltime tomography but also provides new insight into potential hazards detection in underground geotechnical engineering.

Keywords： Underground engineering     Traveltime tomography     Complex structures     Abnormal region identification     Raytracing    

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analysis of soil failure on defective underground pipe due to cyclic water supply and drainage using X-ray

Toshifumi MUKUNOKI, Naoko KUMANO, Jun OTANI

Frontiers of Structural and Civil Engineering 2012, Volume 6, Issue 2,   Pages 85-100 doi: 10.1007/s11709-012-0159-5

Abstract: Authors focused this problem and hence performed model tests with water-inflow and drainage cycle inthe model ground.The mechanism of cavity generation in the model ground was observed using an X-ray Computed TomographyIn those studies, water was supplied into the model grounds from the defected underground pipe modelAnd afterward, the cavity was generated just above the defected part of the model pipe in the ground.

Keywords： relative density     grain property     model test     road subsidence     underground pipe     image processing     X-ray CT    

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Sensory innervation of the anterior eye segment in rats: a retrograde tracing study

Haixia LIU MD , Zhiwang LI MD , Min YANG MD , Xiang TIAN MS , Chaoying LI PhD , Lei PEI PhD ,

Frontiers of Medicine 2009, Volume 3, Issue 3,   Pages 352-356 doi: 10.1007/s11684-009-0065-y

Abstract: study aimed to investigate the sensory innervation of the anterior eye segment in rats by retrograde tracing#8217;s eye, i.e. the cornea, ciliary body, iris, and trabecular meshwork, were studied by retrograde tracingIt is feasible to identify them using retrograde tracing with FAST Dil anterior chamber injection.

Keywords： trigeminal ganglion     retrograde tracing    

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A study on quality evaluation for bituminous mixture using X-ray CT

Satoshi TANIGUCHI, Keiichiro OGAWA, Jun OTANI, Itaru NISHIZAKI

Frontiers of Structural and Civil Engineering 2013, Volume 7, Issue 2,   Pages 89-101 doi: 10.1007/s11709-013-0197-7

Abstract: objective of this paper is to propose a new quality evaluation method for asphalt concrete mixture using X-rayTo achieve this aim, asphalt mixtures should be subjected to the X-ray CT scanning and its characteristicscoarse-graded and porous asphalt mixtures were made; 3) materials and mixtures were subjected to the X-ray

Keywords： asphalt concrete mixture     aggregate     bitumen     bitumen content     quality evaluation     X-ray CT    

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Adsorption of fluoride on clay minerals and their mechanisms using X-ray photoelectron spectroscopy

Junyi DU, Daishe WU, Huayun XIAO, Ping LI

Frontiers of Environmental Science & Engineering 2011, Volume 5, Issue 2,   Pages 212-226 doi: 10.1007/s11783-010-0255-5

Abstract: times by probing their fluoride superficial layer binding energies and element compositions using X-ray

Keywords： clay mineral     fluoride (F)     adsorption mechanism     X-ray photoelectron spectroscopy (XPS)    

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Optimization and modeling of coagulation-flocculation to remove algae and organic matter from surface water by response surface methodology

Ray, Ajay K Ray, Tianyin Huang, Jiabin Chen

Frontiers of Environmental Science & Engineering 2019, Volume 13, Issue 5, doi: 10.1007/s11783-019-1159-7

Abstract: Charge neutralization and sweep flocculation were the major mechanisms. Effect of process parameters was investigated. Optimal coagulation conditions were studied by response surface methodology. ANN models presented more robust and accurate prediction than RSM. Seasonal algal blooms of Lake Yangcheng highlight the necessity to develop an effective and optimal water treatment process to enhance the removal of algae and dissolved organic matter (DOM). In the present study, the coagulation performance for the removal of algae, turbidity, dissolved organic carbon (DOC) and ultraviolet absorbance at 254 nm (UV254) was investigated systematically by central composite design (CCD) using response surface methodology (RSM). The regression models were developed to illustrate the relationships between coagulation performance and experimental variables. Analysis of variance (ANOVA) was performed to test the significance of the response surface models. It can be concluded that the major mechanisms of coagulation to remove algae and DOM were charge neutralization and sweep flocculation at a pH range of 4.66–6.34. The optimal coagulation conditions with coagulant dosage of 7.57 mg Al/L, pH of 5.42 and initial algal cell density of 3.83 × 106 cell/mL led to removal of 96.76%, 97.64%, 40.23% and 30.12% in term of cell density, turbidity, DOC and UV254 absorbance, respectively, which were in good agreement with the validation experimental results. A comparison between the modeling results derived through both ANOVA and artificial neural networks (ANN) based on experimental data showed a high correlation coefficient, which indicated that the models were significant and fitted well with experimental results. The results proposed a valuable reference for the treatment of algae-laden surface water in practical application by the optimal coagulation-flocculation process.

Keywords： Algae     Coagulation-flocculation     Response surface methodology     Artificial neural networks    

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Establishing two-stage interaction between fly ash and NaOH by X-ray and infrared analyses

Bhagwanjee JHA,Nevin KOSHY,Devendra Narain SINGH

Frontiers of Environmental Science & Engineering 2015, Volume 9, Issue 2,   Pages 216-221 doi: 10.1007/s11783-014-0630-8

Abstract: explored by several researchers and formation of fly ash zeolites has been confirmed based on the X-ray

Keywords： hydrothermal treatment     alkali activation     fly ash zeolites     X-ray diffraction (XRD) and Fourier transform-infrared    

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Application of gamma-ray attenuation technology in density measurement of a slurry reactor

Jian XU, Weisheng WEI, Kai ZHANG

Frontiers of Chemical Science and Engineering 2010, Volume 4, Issue 4,   Pages 486-490 doi: 10.1007/s11705-010-0509-6

Abstract: Axial density profile of the gas-liquid-solid mixture in a slurry bubble column was measured by gamma-rayIt was found that the response frequency and the ray intensity should be as high as possible to improvecoefficient depended on not the object’s thickness but the location where the object was placed between the raycolumn decreases with the increase of column height, which indicates that the measurement by gamma-ray

Keywords： slurry reactor     axial density distribution     gamma-ray attenuation technology    

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Heat Integration retrofit analysis—an oil refinery case study by Retrofit Tracing Grid Diagram

Andreja NEMET, Jiří Jaromír KLEMEŠ, Petar Sabev VARBANOV, Valter MANTELLI

Frontiers of Chemical Science and Engineering 2015, Volume 9, Issue 2,   Pages 163-182 doi: 10.1007/s11705-015-1520-8

Abstract: The Retrofit Tracing Grid Diagram presents all streams and heat exchangers in temperature scale and the

Keywords： Heat Integration     retrofit     Pinch Analysis     thermodynamic approach     oil refinery    

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Design of efficient Pt-based electrocatalysts through characterization by X-ray absorption spectroscopy

Nebojsa S. MARINKOVIC, Kotaro SASAKI, Radoslav R. ADZIC

Frontiers in Energy 2017, Volume 11, Issue 3,   Pages 236-244 doi: 10.1007/s11708-017-0487-1

Abstract: A method is described to determine the internal structure of electrocatalyst nanoparticles by X-rayspectroscopic technique typically utilizing synchrotron radiation as the source measures changes in the X-rayThe examples of nanoparticle structures designed in the laboratory and the approach to model efficient

Keywords： X-ray absorption spectroscopy     EXAFS     XANES     nanocatalysts     core shell    

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Error analysis of the parameters for non-coaxial grazing X-ray microscope

ZHAO Lingling, HU Jiasheng, LI Xiang

Frontiers of Mechanical Engineering 2007, Volume 2, Issue 3,   Pages 323-329 doi: 10.1007/s11465-007-0057-z

Abstract: A non-coaxial grazing X-ray microscope, consisting of four spherical mirrors, is designed for diagnosisA set of non-coaxial grazing X-ray microscopes is manufactured based on the tolerances.

Keywords： non-coaxial     spherical     manufacturing     necessary     diagnosis    

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Title Author Date Type Operation

Influence of Particle Size on Laser Absorption and Scanning Track Formation Mechanisms of Pure Tungsten Powder during Selective Laser Melting

Jiayao Zhang, Dongdong Gu, Ying Yang, Hongmei Zhang, Hongyu Chen, Donghuai Dai, Kaijie Lin

Journal Article

Ray-triangular Bézier patch intersection using hybrid clipping algorithm

Yan-hong LIU,Juan CAO,Zhong-gui CHEN,Xiao-ming ZENG

Journal Article

Machine learning based altitude-dependent empirical LoS probability model for air-to-ground communications

Minghui PANG, Qiuming ZHU, Zhipeng LIN, Fei BAI, Yue TIAN, Zhuo LI, Xiaomin CHEN

Journal Article

Optical performance analysis of an innovative linear focus secondary trough solar concentrating system

Xiliang ZHANG, Zhiying CUI, Jianhan ZHANG, Fengwu BAI, Zhifeng WANG

Journal Article

Early Identification of Abnormal Regions in Rock-Mass Using Traveltime Tomography

Longjun Dong,Zhongwei Pei,Xin Xie,Yihan Zhang,Xianhang Yan

Journal Article

analysis of soil failure on defective underground pipe due to cyclic water supply and drainage using X-ray

Toshifumi MUKUNOKI, Naoko KUMANO, Jun OTANI

Journal Article

Sensory innervation of the anterior eye segment in rats: a retrograde tracing study

Haixia LIU MD , Zhiwang LI MD , Min YANG MD , Xiang TIAN MS , Chaoying LI PhD , Lei PEI PhD ,

Journal Article

A study on quality evaluation for bituminous mixture using X-ray CT

Satoshi TANIGUCHI, Keiichiro OGAWA, Jun OTANI, Itaru NISHIZAKI

Journal Article

Adsorption of fluoride on clay minerals and their mechanisms using X-ray photoelectron spectroscopy

Junyi DU, Daishe WU, Huayun XIAO, Ping LI

Journal Article

Optimization and modeling of coagulation-flocculation to remove algae and organic matter from surface water by response surface methodology

Ray, Ajay K Ray, Tianyin Huang, Jiabin Chen

Journal Article

Establishing two-stage interaction between fly ash and NaOH by X-ray and infrared analyses

Bhagwanjee JHA,Nevin KOSHY,Devendra Narain SINGH

Journal Article

Application of gamma-ray attenuation technology in density measurement of a slurry reactor

Jian XU, Weisheng WEI, Kai ZHANG

Journal Article

Heat Integration retrofit analysis—an oil refinery case study by Retrofit Tracing Grid Diagram

Andreja NEMET, Jiří Jaromír KLEMEŠ, Petar Sabev VARBANOV, Valter MANTELLI

Journal Article

Design of efficient Pt-based electrocatalysts through characterization by X-ray absorption spectroscopy

Nebojsa S. MARINKOVIC, Kotaro SASAKI, Radoslav R. ADZIC

Journal Article

Error analysis of the parameters for non-coaxial grazing X-ray microscope

ZHAO Lingling, HU Jiasheng, LI Xiang

Journal Article