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基于two-stage GAM的万泉河口爪哇拟虾虎鱼仔鱼对环境因子的响应 认领 引用 被引量：1
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作者 王先宁 陈枳锐 +5 位作者 陈涛 罗亦斯 王智豪 程飞 谢松光 宋一清 《渔业科学进展》 CSCD 北大核心 2026年第3期29-39,共11页
万泉河口作为典型的热带河口生态系统,为多种鱼类提供了关键的繁殖和育幼栖息地,其复杂生境条件和水文水动力条件对鱼类早期资源的分布格局影响显著。爪哇拟虾虎鱼(Pseudogobius javanicus)是该区域仔鱼群落的优势种,对环境变化高度敏感... 万泉河口作为典型的热带河口生态系统,为多种鱼类提供了关键的繁殖和育幼栖息地,其复杂生境条件和水文水动力条件对鱼类早期资源的分布格局影响显著。爪哇拟虾虎鱼(Pseudogobius javanicus)是该区域仔鱼群落的优势种,对环境变化高度敏感,是评估栖息地质量的重要指示物种。为探明爪哇拟虾虎鱼仔鱼动态的关键驱动因子及响应关系,本研究于2021年5月至2022年4月在万泉河口的7个站点4个生境类型开展周年监测,采集爪哇拟虾虎鱼仔鱼样本及9项环境因子数据,并构建两阶段广义加性模型(two-stage GAM)评估仔鱼对环境因子的响应关系。结果显示,爪哇拟虾虎鱼仔鱼丰度呈现明显的季节性和空间异质性,表现为雨季(6―8月)显著高于旱季,红树林边缘和沉水植物区最高,是仔鱼育幼核心区。GAM1显示,温度、氨氮、溶解氧及叶绿素a(Chl-a)为影响出现概率的关键因子(累计偏差解释率为77.6%,P<0.05)。GAM2模型中盐度、pH、温度及Chl-a共同调控仔鱼丰度(累计偏差解释率为77.3%,P<0.05)。Two-stage GAM识别的最适“环境窗口”为:温度26~30℃、盐度4~6和20~25、pH 7.2~7.6、氨氮<0.2 mg/L、Chl-a<10μg/L、DO 6~7mg/L。本研究证实,two-stage GAM能有效克服仔鱼资源调查中零膨胀数据的干扰,可准确揭示仔鱼与环境因子的响应关系。基于研究结果,建议优先保护红树林边缘与沉水植物区,实施生态修复与扰动控制;强化雨季期间氨氮与Chl-a阈值监管,并设立6―8月季节性禁渔区,以提升栖息地质量、促进万泉河口鱼类早期资源的持续恢复和保护。 展开更多
关键词 两阶段广义加性模型 爪哇拟虾虎鱼 时空分布 万泉河口 环境因子
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基于Two-Stage GAM模型分析带鱼保护区内小黄鱼的分布格局及其与环境因子的关系 认领 引用
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作者 路鹏 许辉 +7 位作者 张洪亮 徐开达 周永东 金梓慧 王诗昊 周嘉怡 李思萌 汪雨柯 《大连海洋大学学报》 CAS CSCD 北大核心 2026年第2期318-329,共12页
为探明东海带鱼国家级水产种质资源保护区内小黄鱼(Larimichthys polyactis)在春、秋两季的时空分布特征及其与环境因子的关系,基于2022—2024年春季(4月)和秋季(11月)的底拖网渔业调查数据,采用两阶段广义加性模型(Two-stage GAM)对小... 为探明东海带鱼国家级水产种质资源保护区内小黄鱼(Larimichthys polyactis)在春、秋两季的时空分布特征及其与环境因子的关系,基于2022—2024年春季(4月)和秋季(11月)的底拖网渔业调查数据,采用两阶段广义加性模型(Two-stage GAM)对小黄鱼的出现概率和生物量分别建模。结果表明:春季小黄鱼出现概率主要受水深及其与底层水温、叶绿素a的交互作用影响,在合适水深范围、适宜底层水温(13℃~18℃)及叶绿素a浓度适中的海域,小黄鱼的出现概率显著上升;在小黄鱼已出现的前提下,其春季生物量表现出明显的空间异质性,主要集中分布在保护区中西部及东北部局部海域;秋季小黄鱼的出现概率仍与水深有一定关系,但生物量主要受空间位置主导,高密度区主要位于保护区的东部和东北部海域;研究结果显示,小黄鱼在带鱼保护区产卵期更倾向于选择“适宜水温—适中水深—中等初级生产力”共同构成的海域环境,而在越冬前则表现出沿特定洄游路线聚集的空间特征。研究表明,Two-stage GAM模型能有效处理渔业调查数据中高零值的问题,较好地揭示了小黄鱼的栖息分布规律,为在春、秋两季对带鱼保护区东北海域实施重点养护及差异化管护提供了方法依据与管理参考。 展开更多
关键词 小黄鱼 带鱼保护区 时空分布 两阶段广义加性模型 环境因子
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Predictive Characteristics of Co-authorship Networks: Comparing the Unweighted, Weighted, and Bipartite Cases 认领 引用
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作者 Raf Guns 《Journal of Data and Information Science》 2016年第3期59-78,共20页
Purpose： This study aims to answer the question to what extent different types of networks can be used to predict future co-authorship among authors.Design/methodology/approach： We compare three types ot networks： ... Purpose： This study aims to answer the question to what extent different types of networks can be used to predict future co-authorship among authors.Design/methodology/approach： We compare three types ot networks： unwelgntea networks, in which a link represents a past collaboration; weighted networks, in which links are weighted by the number of joint publications; and bipartite author-publication networks. The analysis investigates their relation to positive stability, as well as their potential in predicting links in future versions of the co-authorship network. Several hypotheses are tested.Findings： Among other results, we find that weighted networks do not automatically lead to better predictions. Bipartite networks, however, outperform unweighted networks in almost all cases. Research limitations： Only two relatively small case studies are considered Practical implications： The study suggests that future link prediction studies on networks should consider using the bipartite network as a training network. Originality/value： This is the first systematic comparison of unweighted, weighted, and bipartite training networks in link prediction. 展开更多
关键词 Network evolution Link prediction Weighted networks Bipartite networks Two-mode networks
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Surgical Experience with Scoliosis Associated with Adolescent Turner Syndrome: Two Case Reports and a Literature Review 认领 引用
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作者 Akihito Wada Takashi Dezawa +4 位作者 Kazumasa Nakamura Keiji Hasegawa Katsunori Fukutake Akinori Tani Hiroshi Takahashi 《Open Journal of Orthopedics》 2025年第2期69-77,共9页
Background: Turner syndrome (TS) affects approximately one in 2500 live births in females. Scoliosis is one of the skeletal manifestations of TS, but most cases only require observation or conservative treatment. We e... Background: Turner syndrome (TS) affects approximately one in 2500 live births in females. Scoliosis is one of the skeletal manifestations of TS, but most cases only require observation or conservative treatment. We experienced two adolescent TS cases in which progression of scoliosis required surgical intervention, which is very rare in TS. Case Presentation: Case 1: An 11-year-old female with TS had a single thoracic curve that rapidly progressed to a triple major curve with a 76˚ main thoracic curve at age 13.5 years. Case 2: A 14-year-old female with TS had a 59˚ single thoracic curve. In both cases, growth hormone and estrogen replacement therapy were administered preoperatively and planned postoperatively. Posterior correction and instrumented fusion using simultaneous translation on two rods technique and direct vertebral rotation with the use of multiple rod introducers were successfully performed in both cases. No crankshaft phenomenon or distal adding on were observed during those postoperative courses. Conclusions: Although curve pattern of the deformity is similar to adolescent idiopathic scoliosis (AIS), bone quality in patient with TS is lower. In the context of surgical interventions for scoliosis associated with TS, it is imperative to employ surgical techniques that take into account the suboptimal bone quality. If continuation of hormone replacement therapy is planned after corrective surgery for scoliosis in TS patients, it is essential to follow the patient closely postoperatively until bone maturation is complete. 展开更多
关键词 Turner Syndrome Scoliosis Hormone Replacement Therapy Simultaneous Translation on Two Rods Rod Introducer
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Clinical Effect Analysis of Negative Pressure Chest Drainage in Patients after Two-Port Thoracoscopic Valve Surgery 认领 引用
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作者 Yanfang Wei Aizhen Wei +3 位作者 Yuan Feng Jinmao Lu Shusong Li Linqiang Li 《Natural Science》 2025年第2期7-12,共6页
Objective: This study aims to investigate the drainage effect and clinical outcomes of negative pressure chest drainage in patients after two-port thoracoscopic valve surgery, comparing the differences in postoperativ... Objective: This study aims to investigate the drainage effect and clinical outcomes of negative pressure chest drainage in patients after two-port thoracoscopic valve surgery, comparing the differences in postoperative pain, hospital stay, and other factors between the negative pressure group and the control group. Methods: This study is a prospective controlled trial that selected patients undergoing two-port thoracoscopic valve surgery at a certain hospital from January 2019 to December 2024. Patients were randomly assigned to the control group and the negative pressure group using a random number table method. The control group consisted of 30 patients (20 males, 10 females, mean age 42.03 ± 12.89 years), and the negative pressure group consisted of 35 patients (26 males, 9 females, mean age 41.84 ± 11.83 years). The control group received traditional chest drainage, while the negative pressure group received negative pressure chest drainage. Postoperative pain scores, hospital stay, drainage time, number of tube blockages, and incidences of pneumothorax or subcutaneous emphysema were recorded and statistically analyzed. Results: The negative pressure group had a significantly shorter postoperative drainage time compared to the control group (49.09 ± 11.99 hours vs. 79.10 ± 7.32 hours, P < 0.001). The postoperative pain score was lower in the negative pressure group (4.49 ± 1.27 vs. 7.03 ± 0.85, P < 0.001), and the hospital stay was significantly shorter (9.83 ± 1.69 days vs. 14.73 ± 2.32 days, P < 0.001). The incidence of pneumothorax or subcutaneous emphysema was significantly lower in the negative pressure group than in the control group (14.29% vs. 56.67%, P = 0.0003). Conclusion: The application of negative pressure chest drainage in patients after two-port thoracoscopic valve surgery can effectively reduce postoperative pain, shorten hospital stay, and lower the incidence of tube blockage and pneumothorax, demonstrating good clinical outcomes. 展开更多
关键词 Negative Pressure Chest Drainage Two-Port Thoracoscopy Valve Surgery Cardiac Surgery
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Lab Take Two安全管理模式在科研实验室中的应用 认领 引用
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作者 崔磊明 《化工管理》 2025年第17期128-132,共5页
化工科研实验室因学科特性,科研人员在开展研发工作时面临一定安全风险。如何保障实验室科研环境安全、消除潜在安全隐患,是值得深入探讨的问题。Lab Take Two是一种行为安全管理模式,即利用较短时间思考即将开展工作的计划、安全风险... 化工科研实验室因学科特性,科研人员在开展研发工作时面临一定安全风险。如何保障实验室科研环境安全、消除潜在安全隐患,是值得深入探讨的问题。Lab Take Two是一种行为安全管理模式,即利用较短时间思考即将开展工作的计划、安全风险及潜在问题,并针对发现的安全风险和潜在问题采取相应控制手段,以消除实验室潜在安全隐患,属于实验室行为安全理论。通过实施Lab Take Two行为安全管理,可引导员工主动发现实验室潜在安全隐患,有效降低实验室风险,减少科研实验室未遂事件和事故,为化工科研工作提供有力保障。 展开更多
关键词 Lab Take Two 科研实验室 行为安全管理
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Tunable two-axis spin model and spin squeezing in two cavities 认领 引用 被引量：2
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作者 俞立先 李彩凤 +3 位作者 樊景涛 陈刚 张天才 贾锁堂 《Chinese Physics B》 SCIE EI CAS CSCD 2016年第5期31-37,共7页
Multi-mode cavities have now attracted much attention both experimentally and theoretically. In this paper, inspired by recent experiments of cavity-assisted Raman transitions, we realize a two-axis spin Hamiltonian H... Multi-mode cavities have now attracted much attention both experimentally and theoretically. In this paper, inspired by recent experiments of cavity-assisted Raman transitions, we realize a two-axis spin Hamiltonian H = q（J_x^2＋ χJ_y^2） ＋ ω_0J_z in two cavities. This realized Hamiltonian has a distinct property that all parameters can be tuned independently. For proper parameters, the well-studied one- and two-axis twisting Hamiltonians are recovered, and the scaling of N^（-1） of the maximal squeezing factor can occur naturally. On the other hand, in the two-axis twisting Hamiltonian, spin squeezing is usually reduced when increasing the atomic resonant frequency ω_0. Surprisingly, we find that by combining with the dimensionless parameter χ（-1）, this atomic resonant frequency ω_0 can enhance spin squeezing greatly. These results are beneficial for achieving the required spin squeezing in experiments. 展开更多
关键词 two-axis spin model spin squeezing two cavities
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REVIEW ON MATHEMATICAL ANALYSIS OF SOME TWO-PHASE FLOW MODELS 认领 引用 被引量：6
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作者 Huanyao WEN Lei YAO Changjiang ZHU 《Acta Mathematica Scientia》 SCIE CSCD 2018年第5期1617-1636,共20页
The two-phase flow models are commonly used in industrial applications, such as nuclear, power, chemical-process, oil-and-gas, cryogenics, bio-medical, micro-technology and so on. This is a survey paper on the study o... The two-phase flow models are commonly used in industrial applications, such as nuclear, power, chemical-process, oil-and-gas, cryogenics, bio-medical, micro-technology and so on. This is a survey paper on the study of compressible nonconservative two-fluid model, drift-flux model and viscous liquid-gas two-phase flow model. We give the research developments of these three two-phase flow models, respectively. In the last part, we give some open problems about the above models. 展开更多
关键词 compressible nonconservative two-fluid model drift-flux model viscous liquid-gas two-phase flow model well-posedness
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A CLASS OF MULTIWAVELETS AND PROJECTED FRAMES FROM TWO-DIRECTION WAVELETS 认领 引用 被引量：5
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作者 李尤发 杨守志 《Acta Mathematica Scientia》 SCIE CSCD 2014年第2期285-300,共16页
This article aims at studying two-direction refinable functions and two-direction wavelets in the setting R^s, s 〉 1. We give a sufficient condition for a two-direction refinable function belonging to L^2（R^s）. The... This article aims at studying two-direction refinable functions and two-direction wavelets in the setting R^s, s 〉 1. We give a sufficient condition for a two-direction refinable function belonging to L^2（R^s）. Then, two theorems are given for constructing biorthogonal （orthogonal） two-direction refinable functions in L^2（R^s） and their biorthogonal （orthogonal） two-direction wavelets, respectively. From the constructed biorthogonal （orthogonal） two-direction wavelets, symmetric biorthogonal （orthogonal） multiwaveles in L^2（R^s） can be obtained easily. Applying the projection method to biorthogonal （orthogonal） two-direction wavelets in L^2（R^s）, we can get dual （tight） two-direction wavelet frames in L^2（R^m）, where m ≤ s. From the projected dual （tight） two-direction wavelet frames in L^2（R^m）, symmetric dual （tight） frames in L^2（R^m） can be obtained easily. In the end, an example is given to illustrate theoretical results. 展开更多
关键词 Two-direction refinable functions two-direction wavelets multiwavelets waveletframes biothogonal （orthogonal） symmetry projection method
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GREEN FUNCTION ON TWO-PHASE SATURATED MEDIUM BY CONCENTRATED FORCE IN TWO-DIMENSIONAL DISPLACEMENT FIELD 认领 引用 被引量：2
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作者 丁伯阳 丁翠红 +1 位作者 陈禹 陶海冰 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI 2004年第8期951-956,共6页
The Green function on two-phase saturated medium by concentrated force has a broad and important use In seismology, seismic engineering, soil mechanics, geophysics, dynamic foundation theory and so on. According to th... The Green function on two-phase saturated medium by concentrated force has a broad and important use In seismology, seismic engineering, soil mechanics, geophysics, dynamic foundation theory and so on. According to the Green function on two-phase saturated medium by concentrated force in three-dimentional displacement field obtained by Ding Bo-yang et al., it gives out the Green function in two-dimensional displacement field by infinite integral method along x(3)-direction derived by De Hoop and Manolis. The method adopted in the thesis is simpler. The result will be simplified to the boundary element method of dynamic problem. 展开更多
关键词 concentrated force two-phase saturated medium two-dimensional Green function
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基于two-stage GAM模型探究万泉河口须鳗虾虎鱼和真吻虾虎鱼仔鱼分布格局及其对环境因子的响应 认领 引用 被引量：1
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作者 李政 王硕 +6 位作者 杨羽睿 罗金萍 王智豪 程飞 谢松光 宋一清 蔡杏伟 《水生态学杂志》 CSCD 北大核心 2025年第5期172-183,共12页
分析海南岛万泉河口2种虾虎鱼仔鱼的分布特征及其对环境因子的响应,为制定热带河口鱼类资源保护与栖息地管理策略提供科学基础。2021—2022年在万泉河口7个站位采集须鳗虾虎鱼(Taenioidescirratus)和真吻虾虎鱼(Rhinogobius similis)仔... 分析海南岛万泉河口2种虾虎鱼仔鱼的分布特征及其对环境因子的响应,为制定热带河口鱼类资源保护与栖息地管理策略提供科学基础。2021—2022年在万泉河口7个站位采集须鳗虾虎鱼(Taenioidescirratus)和真吻虾虎鱼(Rhinogobius similis)仔鱼样品并收集环境因子,利用两阶段广义加性模型(two-stage GAM)研究2种仔鱼的时空分布特征,并分析与环境因子的响应关系。结果显示,2种仔鱼均呈现出明显的季节差异和空间异质性。须鳗虾虎鱼仔鱼丰度在雨季(5—10月)显著高于旱季,其中8月达到最高值,主要分布在潟湖内部的红树林边缘区域;真吻虾虎鱼仔鱼丰度在旱季(12—翌年4月)明显高于雨季,其中2月达到最高值,主要分布在河口近岸的砂质底质区域。GAM模型结果表明,须鳗虾虎鱼的出现概率主要受溶解氧、总氮和pH影响(累计解释率68.3%),丰度则受温度、盐度和叶绿素a调控(累计解释率68.7%);真吻虾虎鱼的出现概率主要受温度和溶解氧影响(累计解释率57.5%),其丰度则受溶解氧、总氮、叶绿素a和pH影响(累计解释率75.4%)。研究表明两阶段广义加性模型可有效解决数据中的零膨胀与非线性问题,为仔鱼分布格局与环境响应机制提供更高精度的量化手段。 展开更多
关键词 仔鱼 须鳗虾虎鱼 真吻虾虎鱼 时空分布 环境因子 两阶段广义加性模型 万泉河口
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DECOUPLING CONTROL OF TWO MOTORS SYSTEM BASED ON NEURAL NETWORK INVERSE SYSTEM 认领 引用 被引量：2
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作者 WangDeming JuPing LiuGuohai 《Chinese Journal of Mechanical Engineering》 EI CAS 2004年第4期602-605,共4页
In accordance with the characteristics of two motors system, the unitedmathematic model of two-motors inverter system with v/f variable frequency speed-regulating isgiven. Two-motor inverter system can be decoupled by... In accordance with the characteristics of two motors system, the unitedmathematic model of two-motors inverter system with v/f variable frequency speed-regulating isgiven. Two-motor inverter system can be decoupled by the neural network invert system, and changedinto a sub-system of speed and a sub-system of tension. Multiple controllers are designed, and goodresults are obtained. Tie system has good static and dynamic performances and high anti-disturbanceof load. 展开更多
关键词 Decoupling control Two-motor system Inverter Neural network inverse system
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Event-triggered robust guaranteed cost control for two-dimensional nonlinear discrete-time systems 认领 引用 被引量：2
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作者 WANG Sen BU Xuhui LIANG Jiaqi 《Journal of Systems Engineering and Electronics》 SCIE CSCD 2019年第6期1243-1251,共9页
An event-triggered scheme is proposed to solve the problems of robust guaranteed cost control for a class of two-dimensional(2-D)discrete-time systems.Firstly,an eventtriggered scheme is proposed for 2-D discrete-time... An event-triggered scheme is proposed to solve the problems of robust guaranteed cost control for a class of two-dimensional(2-D)discrete-time systems.Firstly,an eventtriggered scheme is proposed for 2-D discrete-time systems with parameter uncertainties and sector nonlinearities.Then,according to the Lyapunov functional method,the sufficient conditions for the existence of event-triggered robust guaranteed cost controller for 2-D discrete-time systems with parameter uncertainties and sector nonlinearities are given.Furthermore,based on the sufficient conditions and the linear matrix inequality(LMI)technique,the problem of designing event-triggered robust guaranteed cost controller is transformed into a feasible solution problem of LMI.Finally,a numerical example is given to demonstrate that,under the proposed event-triggered robust guaranteed cost control,the closed-loop system is asymptotically stable and fewer communication resources are occupied. 展开更多
关键词 event-triggered robust guaranteed cost control two dimensional(2-D)nonlinear system networked control system.
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Two-way coupling model for shock-induced laminar boundary-layer flows of a dusty gas 认领 引用
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作者 Boyi Wang Yi Xiong A.N. Osiptsov 《Acta Mechanica Sinica》 SCIE EI CAS 2005年第6期557-563,共7页
The present paper describes a numerical two-way coupling model for shock-induced laminar boundary-layer flows of a dust-laden gas and studies the transverse migration of fine particles under the action of Saffman lift... The present paper describes a numerical two-way coupling model for shock-induced laminar boundary-layer flows of a dust-laden gas and studies the transverse migration of fine particles under the action of Saffman lift force. The governing equations are formulated in the dilute twophase continuum framework with consideration of the finiteness of the particle Reynolds and Knudsen numbers. The full Lagrangian method is explored for calculating the dispersedphase flow fields （including the number density of particles） in the regions of intersecting particle trajectories. The computation results show a significant reaction of the particles on the two-phase boundary-layer structure when the mass loading ratio of particles takes finite values. 展开更多
关键词 Shock wave Dusty gas Two-phase boundary layer Two-way coupling Numerical modeling
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Numerical simulation of stratified turbulent two-phase flow in aquatic environment 认领 引用
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作者 Shen, Yong-Ming Wang, Ya-Ling Liang, Chuan 《Journal of Environmental Sciences》 SCIE EI CAS 2000年第2期24-28,共5页
The two fluid model of stratified turbulent two phase flow in aquatic environment is developed in this paper. The motion of each phase is described by a unified multi fluid model in an Eulerian coordinate system. The ... The two fluid model of stratified turbulent two phase flow in aquatic environment is developed in this paper. The motion of each phase is described by a unified multi fluid model in an Eulerian coordinate system. The laws of turbulent transportation for each phase, and the restriction of each other between the two phases are completely simulated. The complex two phase turbulence with strong buoyancy effects is selected to examine numerically. The extensive experimental data obtained in stratified flow are used here. Comparison of the results of numerical simulation with the experimental data is conducted. It has shown that the results of numerical simulation are satisfactory. 展开更多
关键词 stratified flow two phase turbulence two fluid model aquatic environment CLC number: X131 2 Document code: A
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EFFECT OF EMPIRICAL COEFFICIENTS ON SIMULATION IN TWO-SCALE SECOND-ORDER MOMENT PARTICLE-PHASE TURBULENCE MODEL 认领 引用
16
作者 胡春波 曾卓雄 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI 2006年第11期1491-1497,共7页
A two-scale second-order moment two-phase turbulence model accounting for inter-particle collision is developed, based on the concept of particle large-scale fluctuation due to turbulence and particle small-scale fluc... A two-scale second-order moment two-phase turbulence model accounting for inter-particle collision is developed, based on the concept of particle large-scale fluctuation due to turbulence and particle small-scale fluctuation due to collision. The proposed model is used to simulate gas-particle downer reactor flows. The computational results of both particle volume fraction and mean velocity are in agreement with the experimental results. After analyzing effects of empirical coefficient on prediction results, we can come to a conclusion that, inside the limit range of empirical coefficient, the predictions do not reveal a large sensitivity to the empirical coefficient in the downer reactor, but a relatively great change of the constants has important effect on the prediction. 展开更多
关键词 two-phase flow second-order moment model two-scale fluctuation empirical coefficients
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A TWO-DIMENSIONAL GLIMM TYPE SCHEME ON CAUCHY PROBLEM OF TWO-DIMENSIONAL SCALAR CONSERVATION LAW 认领 引用
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作者 阚辉 杨小舟 《Acta Mathematica Scientia》 SCIE CSCD 2017年第1期1-25,共25页
In this paper,we construct a new two-dimensional convergent scheme to solve Cauchy problem of following two-dimensional scalar conservation law{ tu ＋ xf（u） ＋ yg（u） = 0,u（x,y,0） = u0（x,y）.In which initial dat... In this paper,we construct a new two-dimensional convergent scheme to solve Cauchy problem of following two-dimensional scalar conservation law{ tu ＋ xf（u） ＋ yg（u） = 0,u（x,y,0） = u0（x,y）.In which initial data can be unbounded.Although the existence and uniqueness of the weak entropy solution are obtained,little is known about how to investigate two-dimensional or higher dimensional conservation law by the schemes based on wave interaction of 2D Riemann solutions and their estimation.So we construct such scheme in our paper and get some new results. 展开更多
关键词 two-dimensional conversation law two-dimensional Glimm type scheme Cauchyproblem
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An Integrated Drive for Two PMSMs Involved Automotive Applications and Development of Current Reference Expanded Two Arm Modulation Technique 认领 引用 被引量：2
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作者 V. Krishnakumar V. Kamaraj C. Adrien Perianayagam 《Circuits and Systems》 2016年第8期1794-1815,共22页
A five leg inverter (FLI) control is incorporated to drive two independent rated permanent magnet synchronous motors (PMSMs) for automotive applications. Literature evidences many attempts of employing the FLI for con... A five leg inverter (FLI) control is incorporated to drive two independent rated permanent magnet synchronous motors (PMSMs) for automotive applications. Literature evidences many attempts of employing the FLI for controlling two general purpose/special motors, where variety of modulation techniques has been practiced for performance enhancement. Also in these cases one leg of inverter is common to both the motors. The expanded two arm modulation (ETAM) has been generally engaged in FLI. In ETAM the percentage voltage utilization factor (VUF) is calculated based on “αmax”, where “αmax” is the maximum modulation index and equal to  and hence it restricts the VUF to 50%. This makes the FLI drives to use the dc link in inefficient way, which is due to the fact that conventional ETAM works with voltage reference. This paper modifies the ETAM in an ingenious way to improve the VUF further through current reference. In addition, the developed current reference expanded two arm modulation (CRETAM) minimizes the current harmonics and torque ripple as well. A detailed comparison of the CRETAM with the conventional ETAM and the competent digital counterpart, space vector pulse width modulation (SVPWM), is also presented. The enhancement in VUF, torque ripple minimization and current total harmonic distortion (THD) reduction are found in the MATLAB based simulation results. 展开更多
关键词 EV/HEV Traction Drive SVPWM Five Leg Inverter Two Permanent Magnet Synchronous Motor Drive Current Reference Expanded Two Arm Modulation (CRETAM) Expanded Two Arm Modulation (ETAM)
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THE UPWIND OPERATOR SPLITTING FINITE DIFFERENCE METHOD FOR COMPRESSIBLE TWO-PHASE DISPLACEMENT PROBLEM AND ANALYSIS 认领 引用
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作者 袁益让 《Acta Mathematica Scientia》 SCIE 2002年第4期489-499,共11页
For compressible two-phase displacement problem, a kind of upwind operator splitting finite difference schemes is put forward and make use of operator splitting, of calculus of variations, multiplicative commutation r... For compressible two-phase displacement problem, a kind of upwind operator splitting finite difference schemes is put forward and make use of operator splitting, of calculus of variations, multiplicative commutation rule of difference operators, decomposition of high order difference operators and prior estimates are adopted. Optimal order estimates in L 2 norm are derived to determine the error, in the approximate solution. 展开更多
关键词 two-phase displacement two-dimensional compressibility upwind operator splitting finite difference schemes convergence analysis
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Synthesis, Structure of a Symmetrically Substituted Stilbene with Strong Two-photon Absorption and Up-converted Blue Fluorescence 认领 引用 被引量：1
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作者 Wang, XM Zhou, GY +1 位作者 Yu, WT Jiang, MH 《Chinese Chemical Letters》 SCIE CAS 2001年第11期1001-1004,共4页
Efficient Ti-catalyzed reductive coupling methodology was first employed to synthesize the symmetrical bis-donor stilbene, trans-4, 4'-bis[diphenyl amino] stilbene (BDPAS). X-ray diffraction analyses reveal that t... Efficient Ti-catalyzed reductive coupling methodology was first employed to synthesize the symmetrical bis-donor stilbene, trans-4, 4'-bis[diphenyl amino] stilbene (BDPAS). X-ray diffraction analyses reveal that this new crystal belongs to the triclinic crystal system of centro-symmetric P-1 space group. The DBPAS solution, with the linear transmission at wavelength of greater than or equal to 450 nm, possesses large two-photon absorption cross section as high as 39.4x10(-48) cm(4).s/photon resulting in strong two-photon induced blue fluorescence of 460 nm, pumped by 740 nm laser irradiation. 展开更多
关键词 symmetrical bis-donor stilbene synthesis crystal structure two-photon absorption two-photon-induced fluorescence
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