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| 1 | Real-time rendering of flames on arbitrary deformable objects显示文摘This paper proposes a new real-time algorithm to generate visually plausible flames on arbitrary deformable objects.In order to avoid the time-consuming computation of physical fields,the main idea of our algorithm is to build an approximate distance field based on the object's surface.And then the distance field is sampled and the distance samples are employed to fetch values from a color map which is precomputed according to physical methods.In order to simulate the dynamic flames by static distance field,simplex noise is used to disturb the sampling process.Our algorithm is also capable of handling the interaction between the flames and external factors such as wind.In order to achieve such a goal,two approximate distance fields are built to represent the inner flames and the outer flames respectively,which are combined together to accomplish the interaction.The experimental results show that our algorithm can produce visually plausible and user controllable flames on arbitrary deformable objects in real-time. | WANG Lei YE WanFang DUAN Ming ZHANG YanCi | 2013 | Science China(Information Sciences)2013，56，8： | 2 |
| 2 | A comparison research on replacements of Ba^(2+)by Lu^(3+)and Ba^(2+)-Si^(4+)by Lu^(3+)-Al^(3+)in BaSi_(2)O_(2)N_(2):Eu phosphors显示文摘As a cyan-emitting oxonitridosilicate phosphor,BaSi_(2)O_(2)N_(2):Eu^(2+)can be used as a competent cyan compensator to improve the color rendering index of white light-emitting diodes(WLEDs).However,low luminescence efficiency and poor thermal stability of this type of phosphor seriously suppress its actual application in full-spectrum lighting.The replacements of Ba^(2+)by Lu^(3+)and Ba^(2+)-Si^(4+)by Lu^(3+)-Al^(3+)can greatly increase the luminescence intensity and improve the thermal stability at the same time.With Lu^(3+)doping,the internal quantum efficiencyηIQE Ba_(0.925)Si_(2)O_(2)N_(2):0.03 Eu^(2+),0.045 Lu^(3+)is 24.08%higher than that of Ba_(0.97)Si_(2)O_(2)N_(2):0.03 Eu^(2+).After Al^(3+)co-doping,theηIQE is further increased by 10.31%compared to Ba_(0.925)Si_(2)O_(2)N_(2):0.03 Eu^(2+),0.045 Lu^(3+).When the temperature rises to 473 K,the luminescence intensity of Ba_(0.925)Si_(2)O_(2)N_(2):0.03 Eu^(2+),0.045 Lu^(3+)maintains 62.32%of that at room temperature,which increases by 17.35%in relative to the Ba_(0.97)Si_(2)O_(2)N_(2):0.03 Eu^(2+),while the luminescence intensity of Ba_(0.925)Si_(1.97)O_(2)N_(2):0.03 Eu^(2+),0.045 Lu^(3+),0.03 Al^(3+)keeps 73.87%of the initial value,which increases by18.52%compared to Ba_(0.925)Si_(2)O_(2)N_(2):0.03 Eu^(2+),0.045 Lu^(3+).The mechanisms for luminescence and thermal stability improvement are proposed.The Ba_(0.925)Si_(1.97)O_(2)N_(2):0.03 Eu^(2+),0.045 Lu^(3+),0.03 Al^(3+)cyan phosphor,Y3 Al5 O12:Ce3+yellow phosphor and CaAlSiN3:Eu^(2+)red phosphor are mixed thoroughly and coated on a blue LED(450 nm)to assemble a WLED.The WLED demonstrates a color rendering index(Ra)of 97.1 at150 mA,and the R1-R15 values are all above 90.The results indicate that as an effective cyan compensator in WLED,the BaSi_(2)O_(2)N_(2):Eu^(2+),Lu^(3+),Al^(3+)phosphor has great application prospect in the field of full-spectrum lighting. | Di Wu Lili Liu Huangbin Duan Junrong Wang Wanfang Zou Jiaqing Peng Xinyu Ye | 2022 | Journal of Rare Earths2022，40，1： | 1 |
| 3 | An Improved Honey Badger Algorithm through Fusing Multi-Strategies显示文摘TheHoney Badger Algorithm(HBA)is a novelmeta-heuristic algorithm proposed recently inspired by the foraging behavior of honey badgers.The dynamic search behavior of honey badgers with sniffing and wandering is divided into exploration and exploitation in HBA,which has been applied in photovoltaic systems and optimization problems effectively.However,HBA tends to suffer from the local optimum and low convergence.To alleviate these challenges,an improved HBA(IHBA)through fusing multi-strategies is presented in the paper.It introduces Tent chaotic mapping and composite mutation factors to HBA,meanwhile,the random control parameter is improved,moreover,a diversified updating strategy of position is put forward to enhance the advantage between exploration and exploitation.IHBA is compared with 7 meta-heuristic algorithms in 10 benchmark functions and 5 engineering problems.The Wilcoxon Rank-sum Test,Friedman Test and Mann-WhitneyU Test are conducted after emulation.The results indicate the competitiveness and merits of the IHBA,which has better solution quality and convergence traits.The source code is currently available from:http://gffzz188fe103f8f1460as0kxpkvu6co6b65nn.ffgz.tsg.suse.edu.cn/zhaotao789/IHBA. | Zhiwei Ye Tao Zhao Chun Liu Daode Zhang Wanfang Bai | 2023 | Computers, Materials & Continua2023，76，8： | 0 |
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