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Comparison of white‑to‑white measurements using four devices and their determination of ICL sizing

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Eye and Vision 2024年第5期10卷 28-40页

作者： Robert Edward t.ang Edward Kenneth F.Reyes Fernando Amado J.Ayuyao Jr Maria Isabel N.Umali Emerson M.Cruz Asian Eye Institute Phinma PlazaRockwell Center8Th Floor1200 MakatiPhilippines Cardinal Santos Medical Center 10 Wilson St.Greenhills1502 San JuanPhilippines

Background:to compare the measurements obtained from the Orbscan II,IOLMaster 700,Pentacam AXL,and Castroviejo caliper and their effects on calculating the recommended implantable collamer lens(ICL)size and postoperative vault ***:this is a retrospective cross-sectional study of patients who underwent ICL surgery by a single surgeon from March 1,2018 to July 31,*** were reviewed for the anterior chamber depth(ACD)and white-to-white(WtW)measurements obtained from the Orbscan II,IOLMaster 700,Pentacam AXL,and Castroviejo caliper(WtW only).these were used to calculate the recommended ICL *** actual ICL size implanted,and vault measurements obtained one month postoperatively were also ***:One hundred seven eyes with a mean age of 27.9±7.7 years were included in the *** WtW measurements were significantly different between devices(Pth the IOLMaster 700 having the highest value(12.14±0.04 mm)and the caliper having the lowest value(11.45±0.04 mm).Mean ACD measurements were the lowest in Orbscan II(3.12±0.25 mm)and the highest in Pentacam AXL(3.16±0.24 mm).the Pentacam AXL produced an ICL size similar to the Orbscan in 69.2%of *** IOLMaster yielded an ICL measurement one size larger than Orbscan-based calculations in 64.5%of *** the Orbscan WtW and ACD,the desired vault of 0.25 to 0.75 mm and 0.25 to 1.00 mm was achieved in 70%and 91%of eyes,*** caliper WtW to IOLMaster 700 or Pentacam AXL WtW increases the percentage of achieving the desired vault to 80%,similar to the ***:the Orbscan II,IOLMaster 700,and Pentacam AXL cannot be used interchangeably for calculating ICL *** the WtW from caliper measurement with the ACD of the IOLMaster 700 or Pentacam AXL could improve ICL sizing and achieve a higher percentage of eyes with the desired vault.

关键词： ICL vault Orbscan II IOLMaster 700 Pentacam AXL Caliper

Semi-supervised learning based hybrid beamforming under time-varying propagation environments

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Digital Communications and Networks 2024年第4期10卷 1168-1177页

作者： yin Long Hang Ding simon Murphy School of Computer Science and technology Southwest University of Science and TechnologyMianyang621000China Department of Computing Science University of AlbertaEdmontonT6G 2R3Canada

Hybrid precoding is considered as a promising low-cost technique for millimeter wave(mm-wave)massive Multi-Input Multi-Output(MIMO)*** this work,referring to the time-varying propagation circumstances,with semi-supervised Incremental Learning(IL),we propose an online hybrid beamforming ***,given the constraint of constant modulus on analog beamformer and combiner,we propose a new broadnetwork-based structure for the design model of hybrid *** with the existing network structure,the proposed network structure can achieve better transmission performance and lower ***,to enhance the efficiency of IL further,by combining the semi-supervised graph with IL,we propose a hybrid beamforming scheme based on chunk-by-chunk semi-supervised learning,where only few transmissions are required to calculate the label and all other unlabelled transmissions would also be put into a training data *** the existing single-by-single approach where transmissions during the model update are not taken into the consideration of model update,all transmissions,even the ones during the model update,would make contributions to model update in the proposed *** the model update,the amount of unlabelled transmissions is very large and they also carry some information,the prediction performance can be enhanced to some extent by these unlabelled channel *** results demonstrate the spectral efficiency of the proposed method outperforms that of the existing single-by-single ***,we prove the general complexity of the proposed method is lower than that of the existing approach and give the condition under which its absolute complexity outperforms that of the existing approach.

关键词： Hybrid beamforming time-varying environments Broad network Semi-supervised learning Online learning

Safety and effectiveness of the SUPRACOR presbyopic LASIK algorithm on hyperopic patients

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Eye and Vision 2016年第1期3卷 253-262页

作者： Robert Edward t.ang Emerson M.Cruz Alex U.Pisig Maria Luisa Patricia C.Solis Rosalie Mae M.Reyes Gerhard Youssefi Asian Eye Institute 8th Floor PHINMA PlazaRockwell CenterMakati City 1200Philippines Department of Ophthalmology Cardinal Santos Medical Center10 Wilson St.Greenhills WestSan Juan CityPhilippines tECHNOLAS PerfectVision GmbH A Bausch&Lomb CompanyMesserschmittstrasse 1-3Munich 80992Germany

Background:to evaluate the safety and effectiveness of the Supracor excimer laser algorithm to treat hyperopic presbyopic patients using laser in-situ keratomileusis(LASIK).Methods:this is a retrospective case review of patients diagnosed with hyperopia(Sphere≥+0.0 D and presbyopia reading add≥1.0 D)who underwent Supracor excimer laser treatment on at least one eye for presbyopia correction from year May 2011 to May *** vision was further analyzed after patients were subdivided into three groups:Group A(n=22 eyes,11 patients)had Supracor on both eyes;Group B(n=18 eyes,18 patients)had Supracor in one eye and hyperopic LASIK on fellow eye;and Group C(n=29 eyes,29 patients)had Supracor in one eye and no treatment on the fellow ***:this study evaluated 58 patients wherein 69 eyes underwent Supracor presbyopic ***,mean manifest refraction spherical equivalent(MRSE)of all eyes that underwent Supracor was+1.37±0.72 D with mean uncorrected distance visual acuity(UDVA),uncorrected intermediate visual acuity(UIVA),and uncorrected near visual acuity(UNVA)of 20/50(0.35 logMAR),20/50(0.35 logMAR),and J9(0.61 logMAR),*** 6 months postoperatively,mean MRSE was−0.43±0.59 D with mean UDVA,UIVA and UNVA of 20/25(0.13 logMAR),20/20(0.01 logMAR),and J1(0.05 logMAR),*** of two lines of best-corrected distance visual acuity(BCDVA)was seen in 6%of *** corneal steepening of 1.0 D at the 3 mm zone and 0.7 D in the 5 mm zone was *** vertical coma increased from−0.02 to+0.10 while mean 4th order spherical aberration became more negative from 0.20 to−*** binocular UDVA,UIVA,and UNVA are 20/20,20/20 and J1,respectively,in all treatment groups at the 6 month postoperative *** significant differences in binocular UDVA(p≥0.36),UIVA(p≥0.19)and UNVA(p≥0.56)among groups were ***:Supracor excimer laser algorithm is safe and effective for the treatment of presbyopia in *** and bil

关键词： Presbyopia LASIK Supracor Hyperopia

A numerical method based on boundary integral equations and radial basis functions for plane anisotropic thermoelastostatic equations with general variable coefficients

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Applied Mathematics and Mechanics(English Edition) 2020年第4期41卷 551-566页

作者： W.t.ang X.Wang School of Mechanical and Aerospace Engineering Nanyang Technological UniversitySingapore 639798Singapore Department of Mechanical Engineering National University of SingaporeSingapore 117575Singapore

A boundary integral method with radial basis function approximation is proposed for numerically solving an important class of boundary value problems governed by a system of thermoelastostatic equations with variable coe?cients. the equations describe the thermoelastic behaviors of nonhomogeneous anisotropic materials with properties that vary smoothly from point to point in space. No restriction is imposed on the spatial variations of the thermoelastic coe?cients as long as all the requirements of the laws of physics are satis?ed. to check the validity and accuracy of the proposed numerical method, some speci?c test problems with known solutions are solved.

关键词： elliptic partial differential equation variable coefficient boundary element method radial basis function anisotropic thermoelastostatics

Adding memory to pressure-sensitive phosphors

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Light(Science & Applications) 2019年第1期8卷 1-10页

作者： Robin R.Petit simon E.Michels ang Feng Philippe F.Smet LumiLab Department of Solid State SciencesGhent UniversityKrijgslaan 281-S19000 GentBelgium

Mechanoluminescence(ML)is the phenomenon describing the emission of light during mechanical action on a solid,leading to applications such as pressure sensing,damage detection and visualization of stress *** most cases,this mechanical action releases energy that was previously stored in the crystal lattice of the phosphor by means of trapped charge carriers.A drawback is the need to record the ML emission during a pressure *** this work,we provide a method for adding a memory function to these pressure-sensitive phosphors,allowing an optical readout of the location and intensity of a pressure event in excess of 72 h after the *** is achieved in the BaSi_(2)O_(2)N_(2):Eu^(2+) phosphor,where a broad trap depth distribution essential for the process is *** merging optically stimulated luminescence(OSL),thermoluminescence(tL)and ML measurements,the influence of light,heat and pressure on the trap depth distribution is carefully *** analysis demonstrates that mechanical action can not only lead to direct light emission but also to a reshuffling of trap *** memory effect not only is expected to lead to new pressure sensing applications but also offers an approach to study charge carrier transitions in energy storage phosphors.

关键词： luminescence occupation adding

A micromechanical model based on hypersingular integro-differential equations for analyzing micro-crazed interfaces between dissimilar elastic materials

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Applied Mathematics and Mechanics(English Edition) 2020年第2期41卷 193-206页

作者： X.Wang W.t.ang H.FAN School of Mechanical and Aerospace Engineering Nanyang Technological University50 Nanyang AvenueSingapore 639798Singapore

the current work models a weak(soft) interface between two elastic materials as containing a periodic array of micro-crazes. the boundary conditions on the interfacial micro-crazes are formulated in terms of a system of hypersingular integro-differential equations with unknown functions given by the displacement jumps across opposite faces of the micro-crazes. Once the displacement jumps are obtained by approximately solving the integro-differential equations, the effective stiffness of the micro-crazed interface can be readily computed. the effective stiffness is an important quantity needed for expressing the interfacial conditions in the spring-like macro-model of soft interfaces. Specific case studies are conducted to gain physical insights into how the effective stiffness of the interface may be influenced by the details of the interfacial micro-crazes.

关键词： micromechanical modeling micro-crazed interface effective stiffness coefficient hypersingular integro-differential equation

In situ characterization of particle formation in spray flame synthesis using wide-angle light scattering

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Particuology 2024年第3期86卷 304-312页

作者： simon Aβmann Franz J.t.Huber Stefan Will Lehrstuhl für technische thermodynamik(Ltt) Friedrich-Alexander-Universitat Erlangen-Nürnberg(FAU)Erlangen91058Germany Erlangen Graduate Schoolin Advanced Optical technologies(SAOt) Friedrich-Alexander-Universitat Erlangen-Nurnberg(FAU)Erlangen91052Germany Competence Unit Engineering of Advanced Materials(EAM) Friedrich-Alexander-Universitat Erlangen-Nürnberg(FAU)Erlangen91052Germany

Wide-angle light scattering(WALS)was used for in situ measurements of droplet and nanoparticle size distributions during the synthesis of titania and iron oxide particles from liquid precursor solutions in the standardized SpraySyn burner for spray flame *** was synthesized from titanium tetraisopropoxide(ttIP)and iron oxide from iron(II)nitrate nonahydrate(INN)using ethanol(EtOH)as *** images were taken at heights up to 120 mm above the burner surface and classified into droplet and particle *** size distributions were derived from a sequential analysis of scattering data containing the oscillating Mie pattern,the lognormal size distribution parameters for spherical and fractal particle fractions from a multivariate approach on averaged particle scattering *** results show that the precursor addition leads to altered evaporation behavior and even droplet disruption probably induced by puffing or micro-explosions compared to pure *** the case of ttIP(a hygroscopic alkoxide),the synthesis of a large fraction of spheres was observed,while the nitrate INN leads to the formation of mostly fractal aggregates.

关键词： Spray flame synthesis Metal oxide particles Elastic light scattering Droplet size distribution Nanoparticle morphology Particle size distribution

Physics of electron emission and injection in two-dimensional materials: theory and simulation

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InfoMat 2021年第5期3卷 502-535页

作者： Yee Sin ang Liemao Cao Lay Kee ang Science Mathematics and Technology(SMT)Singapore University of Technology and Design(SUTD)SingaporeSingapore College of Physics and Electronic Engineering Hengyang Normal UniversityHengyangChina

Electrically contacting two-dimensional(2D)materials is an inevitable process in the fabrication of devices for both the study of fundamental nanoscale charge transport physics and the design of high-performance novel electronic and optoelectronic *** physics of electrical contact formation and interfacial charge injection critically underlies the performance,energyefficiency and the functionality of 2D-material-based devices,thus representing one of the key factors in determining whether 2D materials can be successfully implemented as a new material basis for the development of nextgeneration beyond-silicon solid-state device *** this review,the recent developments in the theory and the computational simulation of electron emission,interfacial charge injection and electrical contact formation in 2D material interfaces,heterostructures,and devices are *** on thermionic charge injection phenomena which are omnipresent in 2Dmaterials-based metal/semiconductor Schottky contacts,we summarize various transport models and scaling laws recently developed for 2D *** progress on the first-principle density functional theory simulation of 2D-material-based electrical contacts are also *** review aims to provide a crystalized summary on the physics of charge injection in the 2D Flatlands for bridging the theoretical and the experimental research communities of 2D material device physics and technology.

关键词： 2D material interfaces charge injection contact engineering heterostructures theory and simulations

Forecasting China’s natural gas consumption based on a combination model

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Journal of Natural Gas Chemistry 2010年第5期19卷 493-496页

作者： Gang Xu Weiguo W ang .DalianInstituteofChemicalPhysics ChineseAcademyofSciencesDalian116023LiaoningChina CollegeofQuantitativeEconomics DongbeiUniversityofFinance＆EconomicsDalian116025LiaoningChina

Ensuring a sufficient energy supply is essential to a country. Natural gas constitutes a vital part in energy supply and therefore forecasting natural gas consumption reliably and accurately is an essential part of a country＇s energy policy. Over the years, studies have shown that a combinative model gives better projected results compared to a single model. In this study, we used Polynomial Curve and Moving Average Combination Projection （PCMACP） model to estimate the future natural gas consumption in China from 2009 to 2015. the new proposed PCMACP model shows more reliable and accurate results： its Mean Absolute Percentage Error （MAPE） is less than those of any previous models within the investigated range. According to the PCMACP model, the average annual growth rate will increase for the next 7 years and the amount of natural gas consumption will reach 171600 million cubic meters in 2015 in China.

关键词： natural gas consumption forecasting combination model