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基于直方图均化法的改进Logistic映射伪随机数发生器设计及性能研究 被引量:3
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作者 李頔 魏德敏 《华南理工大学学报(自然科学版)》 EI CAS CSCD 北大核心 2018年第3期134-141,共8页
Logistic映射伪随机数发生器(LM-PRNG)可用于生成均匀分布的伪随机数,但直接生成随机数的数据分布均匀性不佳.为此,文中根据LM-PRNG直接生成随机数数据分布的特性,设计了一种基于直方图优化法的改进Logistic伪随机数发生器(ILM-PRNG),... Logistic映射伪随机数发生器(LM-PRNG)可用于生成均匀分布的伪随机数,但直接生成随机数的数据分布均匀性不佳.为此,文中根据LM-PRNG直接生成随机数数据分布的特性,设计了一种基于直方图优化法的改进Logistic伪随机数发生器(ILM-PRNG),并利用参数检验、均匀性检验及独立性检验分析了LM-PRNG和ILM-PRNG的性能.3种数据规模下的测试结果表明:在显著水平α=0.05下,LM-PRNG生成伪随机数序列的一阶矩在数据规模N=10~3和N=10~4时可以通过检验,在N=10~5时通过检验的比例为60%,其二阶矩、方差和均匀性在本次实验中均未通过检验,通过独立性检验的样本数占本次研究样本数的93.3%;ILM-PRNG生成的均匀分布伪随机数均通过参数检验、均匀性检验和独立性检验,其参数性与均匀性均随着生成数据规模的扩大而不断提高,独立性与数据规模的关系不大;ILM-PRNG可以克服LM-PRNG的不足,生成更良好的均匀分布伪随机数,是一种性能良好的新型伪随机数发生器. 展开更多
关键词 LOGISTIC映射 随机数发生器 直方图均化法 均匀分布 统计检验
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均化设计法在磁装置结构优化设计中的应用
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《船电技术》 2001年第6期47-52,共6页
1引言 在工程中,模型的拼合相当于确定了满足性能要求的电磁(EM)系统的几何尺寸或拓扑结构.这种合成法可分为两类:普通合成法与优化合成法.普通合成法是通过运用积分和系统化方法得到的.这些方法虽然能通过选择合适的函数条件找到系统... 1引言 在工程中,模型的拼合相当于确定了满足性能要求的电磁(EM)系统的几何尺寸或拓扑结构.这种合成法可分为两类:普通合成法与优化合成法.普通合成法是通过运用积分和系统化方法得到的.这些方法虽然能通过选择合适的函数条件找到系统参数从而求得计算结果,但不能保证所得的结果是最佳的;而优化合成结果是通过进行一系列最佳化的求值过程得到的.简而言之,优化合成法通常选用与目标函数紧密相关的方法连用. 展开更多
关键词 均化设计法 磁性装置 结构设计 有限元法 优化设计
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均化设计法在磁装置结构优化设计中的应用(续)
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作者 徐惠明 周长进 《船电技术》 2002年第1期49-51,共3页
本节将进行C-core和H-magnet顶部形状的优化设计。在设计范围内,许多设计变量都与有限元的数量有关。而且每各例在进行50~60次迭代之后都能收敛。利用文献[1]中提出的理想的处理技术,所提出的优化形状就可以被描绘出来了。
关键词 结构设计 优化设计 C-core H-magnet 船舶 磁性材料 均化设计法 磁装置
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大口径光学件误差均化拼接技术 被引量:6
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作者 程刚 蒋世磊 《光电工程》 EI CAS CSCD 北大核心 2006年第6期118-120,129,共4页
运用子孔径检测及拼接的方法可完成大口径光学件面形的干涉测量。为了能够减少子孔径拼接的误差累积与数据处理算法带来的精度影响,运用子孔径拼接的误差拼接算法,并通过对实验检测数据的处理,得到拼接结果与全孔径检测结果比较,面形波... 运用子孔径检测及拼接的方法可完成大口径光学件面形的干涉测量。为了能够减少子孔径拼接的误差累积与数据处理算法带来的精度影响,运用子孔径拼接的误差拼接算法,并通过对实验检测数据的处理,得到拼接结果与全孔径检测结果比较,面形波面峰谷值相差0.084,均方根值相差0.01,误差在Veeco光学干涉测量仪器的公差范围内。实验结果验证了误差均化算法可有效减少误差的传递与累积,实现子孔径拼接技术对大口径光学件的正确检测。 展开更多
关键词 子孔径拼接 大口径光学件 误差均化法 面形测量
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时域三点法测量直线度信息高精度获取方法研究 被引量:3
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作者 王鹏 余晓芬 +1 位作者 孟凡良 刘媛媛 《中国机械工程》 EI CAS CSCD 北大核心 2013年第13期1733-1737,共5页
常规时域三点法在直线度误差测量中会把零位和随机误差的影响迭代放大,使得直线度重构曲线失真,无法得到正确的直线度误差。通过对常规时域三点法数据处理误差放大机理进行研究,提出了基于比较消除法的误差等效均化的处理办法,并利用仿... 常规时域三点法在直线度误差测量中会把零位和随机误差的影响迭代放大,使得直线度重构曲线失真,无法得到正确的直线度误差。通过对常规时域三点法数据处理误差放大机理进行研究,提出了基于比较消除法的误差等效均化的处理办法,并利用仿真和实验证实了其有效性和实用性。优化了时域三点法的直线度测量,使得直线度信息高精度获取成为可能。 展开更多
关键词 时域三点法 直线度误差 比较消除法 误差等效均化处理法
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冲绳海槽浮岩包裹体的测温试验 被引量:9
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作者 翟世奎 张杰 +1 位作者 张明书 于增慧 《海洋与湖沼》 CAS CSCD 北大核心 2001年第1期67-73,共7页
对浮岩中斜长石斑晶中的包裹体及玻璃基质中的包裹体首先进行双面光薄片的镜下观察,然后进行了系统的均化法与爆裂法测温试验。观察与试验结果表明:(1)斜长石中的包裹体均为玻璃质+气泡的两相包裹体,未发现气—液包裹体。固化包裹体... 对浮岩中斜长石斑晶中的包裹体及玻璃基质中的包裹体首先进行双面光薄片的镜下观察,然后进行了系统的均化法与爆裂法测温试验。观察与试验结果表明:(1)斜长石中的包裹体均为玻璃质+气泡的两相包裹体,未发现气—液包裹体。固化包裹体为玻璃质,非晶质的固化包裹体外即是大量的气泡,特别是基质当中气泡更为发育,说明熔浆中含有丰富的挥发性组分,同时也说明包裹体形成于较浅的地质条件下。(2)长石中包裹体的均化温度不受包裹体特征不同的影响,均化温度分布范围从910—1250℃,峰值明显,计算的均化温度为Tz=(1081.4±177.9)℃,但还存在有高于1250℃的均化温度峰。包裹体均化法测试结果说明浮岩中斜长石的形成过程至少有两个阶段:第一阶段的岩浆温度在1200—1300℃左右,在此温度下形成的是An值较高的基性斜长石,同时结晶的还有辉石等矿物,斜长石结晶第二个阶段时的熔浆温度在1100℃以下,这一阶段持续的时间长,跨越的温度范围大,应是岩浆在近地表和岩浆喷出过程中的岩浆快速冷却期,同时伴随有矿物大规模晶出。(3)包裹体中的气相部分均聚合成圆形或近圆形,说明温度下降速度较快。斑晶斜长石中部分包裹体与基质玻璃中包裹体的形成温度是连续变化的。 展开更多
关键词 矿物包裹体 测温试验 冲绳海槽 斜长石斑晶 均化法 流纹英安质浮岩 爆裂法
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一类微型扑翼飞行器的滑模自适应姿态控制 被引量:7
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作者 李航 何广平 毕富国 《空间控制技术与应用》 CSCD 北大核心 2018年第5期81-88,共8页
针对微型扑翼飞行器这类非线性时变系统,基于李雅普诺夫稳定性理论提出了滑模自适应控制算法,应对系统中的不确定性和抑制扰动,完成飞行器悬停阶段调整方位的姿态控制.在高频的扑翼状态下,系统模型利用摄动理论中的平均化法进行近似时... 针对微型扑翼飞行器这类非线性时变系统,基于李雅普诺夫稳定性理论提出了滑模自适应控制算法,应对系统中的不确定性和抑制扰动,完成飞行器悬停阶段调整方位的姿态控制.在高频的扑翼状态下,系统模型利用摄动理论中的平均化法进行近似时不变处理.控制器的设计以滑模控制为主体,滑模面利用误差角三角函数和体角速度构造,来避免不必要的偏航控制,同时结合自适应控制方法,实时逼近无法准确计算的惯性张量和干扰力矩,缓解传统滑模控制中开关函数所带来的抖振问题.Simulink仿真结果表明,滑模自适应控制算法优于传统滑模控制,在正弦干扰气流的影响中有良好的鲁棒性,以此验证了算法的可行性. 展开更多
关键词 微型扑翼飞行器 平均化法 姿态控制 滑模自适应 鲁棒性
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关于长桩超长桩桩基沉降计算问题 被引量:5
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作者 刘金砺 秋仁东 +1 位作者 高文生 邱明兵 《岩土工程学报》 EI CAS CSCD 北大核心 2011年第S2期38-42,共5页
随着高层超高层建筑的兴建快速发展,长桩超长桩桩基的使用随之增多,设计中长桩、超长桩桩基的沉降计算成为一个新的关注焦点。本文首先对既有主要沉降计算方法进行了浅析,通过工程案例采用既有方法进行了沉降计算比较,其中包括我们正在... 随着高层超高层建筑的兴建快速发展,长桩超长桩桩基的使用随之增多,设计中长桩、超长桩桩基的沉降计算成为一个新的关注焦点。本文首先对既有主要沉降计算方法进行了浅析,通过工程案例采用既有方法进行了沉降计算比较,其中包括我们正在研究的Mindlin解均化应力系数法。通过计算过程中附加应力、压缩层厚度、沉降计算结果的合理性、可靠性的分析比较,提出了优化计算方法的意见。 展开更多
关键词 长桩 超长桩 沉降计算 Mindlin解均化应力法
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色裹体自白
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作者 王清廉 《地球》 2005年第3期16-17,共2页
我们是被关闭在石头里的包裹体,而且长期“禁闭”与世隔绝,好像是“囚徒”一样,不得自由。
关键词 玛瑙 水晶 金刚石 均化法 矿床 成矿温度
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Improved Algorithm of Histogram Equalization and Its Actualization 被引量:2
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作者 仲伟波 赵福军 +1 位作者 李鹏 宁书年 《Journal of China University of Mining and Technology》 2003年第1期52-54,共3页
A new improved algorithm of histogram equalization was discussed and actualized by analyzing the traditional algorithm. This improved algorithm has better effect than the traditional one, especially it is used to proc... A new improved algorithm of histogram equalization was discussed and actualized by analyzing the traditional algorithm. This improved algorithm has better effect than the traditional one, especially it is used to process poor quality images. 展开更多
关键词 IMPROVE histogram equalization ALGORITHM GRAY
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TiO2 preparation by improved homogeneous precipitation and application in SCR catalyst 被引量:3
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作者 YAO Jie 《Journal of Central South University》 SCIE EI CAS CSCD 2016年第9期2139-2145,共7页
Ultrasonic treatment and hydrothermal method were applied in the traditional homogeneous precipitation for nano-TiO_2 preparation, which was used as carrier material for the production of honeycomb selective catalytic... Ultrasonic treatment and hydrothermal method were applied in the traditional homogeneous precipitation for nano-TiO_2 preparation, which was used as carrier material for the production of honeycomb selective catalytic reduction(SCR) catalyst. The influence rules of the two improved methods on characterization of TiO_2 samples, denitration activity and mechanical strength of honeycomb SCR catalyst samples were mainly focused on. The results indicate that the specific surface area, particle size and uniformity of TiO_2 samples are significantly improved by both of the ultrasonic and hydrothermal treatments compared with the traditional homogeneous precipitation. Also, the denitration activities of catalyst samples are enhanced by the two improved methods(the NO_x reduction ratio increases from 88.89% to 95.45% by ultrasonic homogeneous precipitation process, and to 94.12% by hydrothermal homogeneous precipitation process). On the other hand, because of good spherical shape and high particle distribution of TiO_2 sample from hydrothermal homogeneous precipitation process, the corresponding honeycomb catalyst samples get the best mechanical strength, which is even higher than that of the reference sample from commercial nano-TiO_2. So, it is concluded that the hydrothermal homogeneous precipitation can be a feasible and effective preparation method of TiO_2 carrier for the honeycomb SCR catalyst production. 展开更多
关键词 NANO-TIO2 honeycomb SCR catalyst homogeneous precipitation ultrasonic treatment hydrothermal method
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Fog Computing Dynamic Load Balancing Mechanism Based on Graph Repartitioning 被引量:8
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作者 SONG Ningning GONG Chao +1 位作者 AN Xingshuo ZHAN Qiang 《China Communications》 SCIE CSCD 2016年第3期156-164,共9页
Because of cloud computing's high degree of polymerization calculation mode, it can't give full play to the resources of the edge device such as computing, storage, etc. Fog computing can improve the resource ... Because of cloud computing's high degree of polymerization calculation mode, it can't give full play to the resources of the edge device such as computing, storage, etc. Fog computing can improve the resource utilization efficiency of the edge device, and solve the problem about service computing of the delay-sensitive applications. This paper researches on the framework of the fog computing, and adopts Cloud Atomization Technology to turn physical nodes in different levels into virtual machine nodes. On this basis, this paper uses the graph partitioning theory to build the fog computing's load balancing algorithm based on dynamic graph partitioning. The simulation results show that the framework of the fog computing after Cloud Atomization can build the system network flexibly, and dynamic load balancing mechanism can effectively configure system resources as well as reducing the consumption of node migration brought by system changes. 展开更多
关键词 fog computing graph partitioning load balancing
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Stability analysis for nonhomogeneous slopes subjected to water drawdown 被引量:2
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作者 SUN Zhi-bin SHU Xing 《Journal of Central South University》 SCIE EI CAS CSCD 2019年第7期1719-1734,共16页
Comparing with the homogeneous slope, the nonhomogeneous slope has more significance in practice. The main purpose of the present study is to provide a preliminary idea that how the nonhomogeneity influences the stabi... Comparing with the homogeneous slope, the nonhomogeneous slope has more significance in practice. The main purpose of the present study is to provide a preliminary idea that how the nonhomogeneity influences the stability of slopes under four different water drawdown regimes. Two typical categories of nonhomogeneity, identified as layered profile and strength increasing with depth profile, are included in the paper, and a nonhomogeneity coefficient is defined to quantify the degree of soil properties nonhomogeneity. With a modified discretization technique, the safety factors of nonhomogeneous slopes are calculated. On this basis, the variation of safety factor with the nonhomogeneity coefficient of friction angle and the water table level are investigated. In the present example, safety factor correlates linearly with friction angle nonhomogeneity coefficient from a whole view and the influences of the water table level on safety factor is basically similar with that in homogeneous condition. 展开更多
关键词 upper bound discretization technique non-homogeneous slope water drawdown
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Simultaneous hybrid modeling of a nosiheptide fermentation process using particle swarm optimization 被引量:1
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作者 Qiangda Yang Hongbo Gao +1 位作者 Weijun Zhang Huimin Li 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2016年第11期1631-1639,共9页
Hybrid modeling approaches have recently been investigated as an attractive alternative to model fermentation processes. Normally, these approaches require estimation data to train the empirical model part of a hybrid... Hybrid modeling approaches have recently been investigated as an attractive alternative to model fermentation processes. Normally, these approaches require estimation data to train the empirical model part of a hybrid model. This may result in decreasing the generalization ability of the derived hybrid model. Therefore, a simultaneous hybrid modeling approach is presented in this paper. It transforms the training of the empirical model part into a dynamic system parameter identification problem, and thus allows training the empirical model part with only measured data. An adaptive escaping particle swarm optimization(AEPSO) algorithm with escaping and adaptive inertia weight adjustment strategies is constructed to solve the resulting parameter identification problem, and thereby accomplish the training of the empirical model part. The uniform design method is used to determine the empirical model structure. The proposed simultaneous hybrid modeling approach has been used in a lab-scale nosiheptide batch fermentation process. The results show that it is effective and leads to a more consistent model with better generalization ability when compared to existing ones. The performance of AEPSO is also demonstrated. 展开更多
关键词 Bioprocess Dynamic modeling Neural networks Optimization
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A Comparative Study on Linear Effective Properties Predictions of an Argillite Rock Using XFEM
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作者 Senjun Wu Naima Belayachi Dashnor Hoxha Due-Phi Do 《Journal of Civil Engineering and Architecture》 2015年第7期780-790,共11页
The mechanical behavior of geomaterials is studied using an XFEM (extended finite element method). Usually, the modeling of such heterogeneous material is performed either through an analytical homogenization approa... The mechanical behavior of geomaterials is studied using an XFEM (extended finite element method). Usually, the modeling of such heterogeneous material is performed either through an analytical homogenization approach, or numerically, especially for complex microstructures. For comparison, the effective properties are obtained using a classical finite element analysis (through the so-called unit cell method) and an analytical homogenization approach. The use of XFEM proposed here retains the accuracy oftbe classical finite element approach, allowing one to use meshes that do not necessarily match the physical boundaries of the material constituents. Thanks to such methods, it is then possible to study materials with complex microstructures that have non-simplified assumptions commonly used by other methods, as well as quantify the impact of such simplification. The versatility of XFEM in dealing with complex microstructures, including polycrystalline-like microstructures, is also shown through the role of shape inclusions on the overall effective properties o fan argillite rock. Voronoi representation is used to describe the complex microstructure of argillite. 展开更多
关键词 XFEM MICROMECHANICS ARGILLITE HOMOGENIZATION Voronoi microstructure linear behavior.
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A model to determining the remaining useful life of rotating equipment,based on a new approach to determining state of degradation 被引量:3
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作者 Saeed RAMEZANI Alireza MOINI +1 位作者 Mohamad RIAHI Adolfo Crespo MARQUEZ 《Journal of Central South University》 SCIE EI CAS CSCD 2020年第8期2291-2310,共20页
Condition assessment is one of the most significant techniques of the equipment’s health management.Also,in PHM methodology cycle,which is a developed form of CBM,condition assessment is the most important step of th... Condition assessment is one of the most significant techniques of the equipment’s health management.Also,in PHM methodology cycle,which is a developed form of CBM,condition assessment is the most important step of this cycle.In this paper,the remaining useful life of the equipment is calculated using the combination of sensor information,determination of degradation state and forecasting the proposed health index.The combination of sensor information has been carried out using a new approach to determining the probabilities in the Dempster-Shafer combination rules and fuzzy c-means clustering method.Using the simulation and forecasting of extracted vibration-based health index by autoregressive Markov regime switching(ARMRS)method,final health state is determined and the remaining useful life(RUL)is estimated.In order to evaluate the model,sensor data provided by FEMTO-ST Institute have been used. 展开更多
关键词 remaining useful life(RUL) prognostics and health management(PHM) autoregressive markov regime switching(ARMRS) health index(HI) Dempster-Shafer theory fuzzy c-means(FCM) Kurtosis-entropy DEGRADATION
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Preparation and Unimolecular-Micellization Behavior of Homopolymer of Surface-Active Monomer AMC14AB
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作者 Kang-kai Liu Lei Li 《Chinese Journal of Chemical Physics》 SCIE CAS CSCD 北大核心 2008年第5期469-475,共7页
(2-acrylamido) ethyl tetradecyl dimethylammonium bromide (AMC14AB) was polymerized in aqueous solu- tion to form the homopolymer P(AMC14AB). The physicochemical properties of P(AMC14AB) in aqueous solution wer... (2-acrylamido) ethyl tetradecyl dimethylammonium bromide (AMC14AB) was polymerized in aqueous solu- tion to form the homopolymer P(AMC14AB). The physicochemical properties of P(AMC14AB) in aqueous solution were mainly studied with fluorescent probe method, surface tension measurement and conductom- etry. The experimental results show that the aggregation morphology of P(AMC14AB) in aqueous solution is unimolecular micelle as expected. Being different from conventional multimolecular micelle systems, the unimolecular micelle system of P(AMC14AB) not only shows critical micellar concentration (CMC=0), (i.e. once added to pure water, the surface tension decreases immediately in spite how small the density is), but also the surface tension stays almost the same with the concentration increasing. That is to say, there is no mutational point on the relationship curve between surface tension and concentration. Furthermore, the unimolecular micelle system of P(AMC14AB) has no Krafft temperature, i.e. at any temperature, so long as it is dissolved in water, the unimolecular micelles will form. Besides this, for the solubilization of hydrophobic organic substances, the unimolecular micelle system of P(AMC14AB) is obviously different from the common multimolecular micelle system, having no turning point on the relationship curve between toluene solubi- lizaion amount and P(AMC14AB) concentration, and the solubilizing ability of the unimolecular-micelle system of P(AMC14AB) for hydrophobic organic substances is much higher than that of the conventional multimolecular micelle solutions of common surfactants, such as centyl trimethyl ammonium bromide. 展开更多
关键词 Surface active monomer Unimolecular micelle Zero critical micellar concentration Krafft temperature
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Real-Time Front Vehicle Detection Algorithm Based on Local Feature Tracking Method 被引量:1
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作者 Jae-hyoung YU Young-joon HAN Hern-soo HAHN 《Journal of Measurement Science and Instrumentation》 CAS 2011年第3期244-246,共3页
This paper proposes an algorithm that extracts features of back side of the vehicle and detects the front vehicle in real-time by local feature tracking of vehicle in the continuous images.The features in back side of... This paper proposes an algorithm that extracts features of back side of the vehicle and detects the front vehicle in real-time by local feature tracking of vehicle in the continuous images.The features in back side of the vehicle are vertical and horizontal edges,shadow and symmetry.By comparing local features using the fixed window size,the features in the continuous images are tracked.A robust and fast Haarlike mask is used for detecting vertical and horizontal edges,and shadow is extracted by histogram equalization,and the sliding window method is used to compare both side templates of the detected candidates for extracting symmetry.The features for tracking are vertical edges,and histogram is used to compare location of the peak and magnitude of the edges.The method using local feature tracking in the continuous images is more robust for detecting vehicle than the method using single image,and the proposed algorithm is evaluated by continuous images obtained on the expressway and downtown.And it can be performed on real-time through applying it to the embedded system. 展开更多
关键词 vehicle detection object tracking real-time algorithm Haarlike edge detection
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A Quantized Kernel Least Mean Square Scheme with Entropy-Guided Learning for Intelligent Data Analysis 被引量:5
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作者 Xiong Luo Jing Deng +3 位作者 Ji Liu Weiping Wang Xiaojuan Ban Jenq-Haur Wang 《China Communications》 SCIE CSCD 2017年第7期127-136,共10页
Quantized kernel least mean square(QKLMS) algorithm is an effective nonlinear adaptive online learning algorithm with good performance in constraining the growth of network size through the use of quantization for inp... Quantized kernel least mean square(QKLMS) algorithm is an effective nonlinear adaptive online learning algorithm with good performance in constraining the growth of network size through the use of quantization for input space. It can serve as a powerful tool to perform complex computing for network service and application. With the purpose of compressing the input to further improve learning performance, this article proposes a novel QKLMS with entropy-guided learning, called EQ-KLMS. Under the consecutive square entropy learning framework, the basic idea of entropy-guided learning technique is to measure the uncertainty of the input vectors used for QKLMS, and delete those data with larger uncertainty, which are insignificant or easy to cause learning errors. Then, the dataset is compressed. Consequently, by using square entropy, the learning performance of proposed EQ-KLMS is improved with high precision and low computational cost. The proposed EQ-KLMS is validated using a weather-related dataset, and the results demonstrate the desirable performance of our scheme. 展开更多
关键词 quantized kernel least mean square (QKLMS) consecutive square entropy data analysis
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Novel Quantum Phases of Ultracold Bosonic Atoms in Honeycomb Optical Lattice
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作者 陆青青 侯净敏 《Communications in Theoretical Physics》 SCIE CAS CSCD 2010年第5期861-863,共3页
We study the quantum phase transition of ultracold atoms in the honeycomb optical lattice. The Hamiltonian of ultracold bosonic atoms in the honeycomb optical lattice is derived. We take the mean-field approximation a... We study the quantum phase transition of ultracold atoms in the honeycomb optical lattice. The Hamiltonian of ultracold bosonic atoms in the honeycomb optical lattice is derived. We take the mean-field approximation and further solve the Hamiltonian with the numerical diagonalization method. We obtain the phase diagram and find that the Mort-insulator (MI), density wave (DW) and modulated superfluid (MS) phases appear. Furthermore, the phase diagram is analyzed according to the order parameter and the average number of particles. 展开更多
关键词 honeycomb optical lattice quantum phase transition ultracold atoms
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