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基于动态窗口法的近海水域船舶避障算法研究

中国舰船研究 2024年第1期19卷 230-237页

作者：李光泽俞万能廖卫强吴川博集美大学轮机工程学院福建厦门361021

[目的]提出一种改进的动态窗口法,以解决近海水域智能船舶在面对夹击及动静混合会遇时无法有效避让的船舶避障问题。[方法]为得到在近海水域航行的船舶约束条件,针对近海水域对船舶避障的影响因素进行分析,同时提出近海水域船舶航行最... 详细信息

[目的]提出一种改进的动态窗口法,以解决近海水域智能船舶在面对夹击及动静混合会遇时无法有效避让的船舶避障问题。[方法]为得到在近海水域航行的船舶约束条件,针对近海水域对船舶避障的影响因素进行分析,同时提出近海水域船舶航行最低避障要求;然后对动态窗口法(DWA)的目标函数进行优化改进,并将其与船舶和障碍物的距离相关联,以提升船舶在航行图中的安全性,同时将目标函数中的航向权值引入船舶会遇态势判断,以使目标船舶可以有效判断船舶的避障责任;最后,通过仿真模拟验证改进算法的有效性。[结果]仿真结果表明,所提的改进算法在分别遭遇夹击以及复杂会遇的情况下,能够清晰地判断船舶的避障责任,降低航行过程中的速度变化陡峭度,且所规划的船舶航行路径可有效提升船舶航行的安全性。[结论]所提避障算法可为解决近海水域智能船舶遭遇复杂会遇情景的避碰失败问题提供参考。

关键词：智能船舶避障动态窗口法自适应权值近海水域

Optimal hardware/software co-synthesis for core-based SoC desi gns

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Journal of Systems Engineering and Electronics 2006年第2期17卷 402-409页

作者： Zhan Jinyu Xiong guangze Coll. of Computer Science and Engineering Univ. of Electronic Science and Technology of China Chengdu 610054 P.R. China

A hardware/software co-synthesis method is presented for SoC designs consisting of both hardware IP cores and software components on a graph-theoretic formulation. Given a SoC integrated with a set of functions and a set of performance factors, a core for each function is selected from a set of alternative IP cores and software components, and optimal partitions is found in a way to evenly balance the performance factors and to ultimately reduce the overall cost, size, power consumption and runtime of the core-based SoC. The algorithm formulates IP cores and components into the corresponding mathematical models, presents a graph-theoretic model for finding the optimal partitions of SoC design and transforms SoC hardware/software co-synthesis problem into finding optimal paths in a weighted, directed graph. Overcoming the three main deficiencies of the traditional methods, this method can work automatically, evaluate more performance factors at the same time and meet the particularity of SoC designs. At last, the approach is illustrated that is practical and effective through partitioning a practical system.

关键词： SoC co-synthesis partition IP core software component optimal path.

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发动机前端附件带传动系统动态特性研究

机械传动 2024年第3期48卷 125-132页

作者：郑光泽晏蓬渊吴玉李晓峰重庆理工大学车辆工程学院重庆400054 重庆铁马变速箱有限公司重庆400050 重庆德音科技有限公司重庆400050

考虑各附件轮时变负载、时变激励、多楔带纵向刚度、径向刚度和弯曲刚度的作用,利用Simdrive软件建立了内层和外层发动机前端附件带传动系统动力学分析模型;对系统的静态特性进行评估,采用Galerkin法进行系统空间离散,利用隐式多步法求... 详细信息

考虑各附件轮时变负载、时变激励、多楔带纵向刚度、径向刚度和弯曲刚度的作用,利用Simdrive软件建立了内层和外层发动机前端附件带传动系统动力学分析模型;对系统的静态特性进行评估,采用Galerkin法进行系统空间离散,利用隐式多步法求解加速工况下系统的动态特性,得出附件轮转速波动、张力波动、带-轮间滑移特性的影响因素;根据分析结果,提出了适当增加初始张力、曲轴轮包角和惰轮2处添加自动张紧器的改进方案。对比分析得知,添加自动张紧器时,发动机前端附件带传动系统的动态特性得到了有效改善。

关键词：多楔带带传动系统 Galerkin法隐示多步法动态特性

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后疫情时代护士职业装创新设计探究

山东纺织科技 2024年第3期65卷 14-18页

作者：金岳琳郑广泽青岛大学山东青岛266071

文章为提升护士群体工作中的舒适度与安全性,采用问卷调查法,设计了一套适用于后疫情时代的护士职业装。研究认为在当下的社会环境中,护士职业装的舒适性与防护性有待提升,多个部位与零部件的设计都需要优化,因此通过护士职业装的改良设... 详细信息

文章为提升护士群体工作中的舒适度与安全性,采用问卷调查法,设计了一套适用于后疫情时代的护士职业装。研究认为在当下的社会环境中,护士职业装的舒适性与防护性有待提升,多个部位与零部件的设计都需要优化,因此通过护士职业装的改良设计,可提升护士群体的着装舒适度与职业认同感。

关键词：护士职业装护士疫情时代创新设计

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水下滑翔机纵垂面运动姿态分析

海洋测绘 2016年第4期36卷 76-79页

作者：魏建仓杨广泽王洪达沙冶郑云鹏天津深之蓝海洋设备科技有限公司天津300457

在水下滑翔机的设计过程中,为了能够预先估计其水动力特性和操纵特性,避免大量的约束模型实验,需要建立动力学模型以仿真分析水下滑翔机的动力学行为。动力学建模是研究水下滑翔机水动力特性的理论基础,是运动控制的分析依据。通过软件... 详细信息

在水下滑翔机的设计过程中,为了能够预先估计其水动力特性和操纵特性,避免大量的约束模型实验,需要建立动力学模型以仿真分析水下滑翔机的动力学行为。动力学建模是研究水下滑翔机水动力特性的理论基础,是运动控制的分析依据。通过软件来模拟滑翔机上浮/下潜平衡状态的姿态,并对其进行受力分析得出此姿态对应的理论俯仰角,与实验数据进行了对比,结果基本吻合,为水下滑翔机的设计与控制提供了参考。

关键词：水下滑翔机姿态分析纵垂面浮心计算俯仰角

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热泵机组在海洋生态高效养殖基地的应用

上海节能 2024年第8期 1376-1381页

作者：黎光泽潘全亮上海置信能源综合服务有限公司

海洋水产养殖基地的南非对虾对水温要求很严格,水温过高或过低都会造成虾苗的大量死亡,因此冬季需采用给水体加温方式养殖,而目前的传统化石能源锅炉加温方式存在环保和碳排放问题,不符合能源使用趋势。采用热泵机组对其进行改造,不仅... 详细信息

海洋水产养殖基地的南非对虾对水温要求很严格,水温过高或过低都会造成虾苗的大量死亡,因此冬季需采用给水体加温方式养殖,而目前的传统化石能源锅炉加温方式存在环保和碳排放问题,不符合能源使用趋势。采用热泵机组对其进行改造,不仅可降低养殖户运行成本,取得可观的经济效益,还能改善养殖生态环境,助力基地实现“双碳”目标。

关键词： “双碳”目标电能替代空气源热泵水源热泵生态养殖

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A millimeter-sized negatively charged polymer embedded with molybdenum disulfide nanosheets for efficient removal of Pb(Ⅱ)from aqueous solution

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Chinese Chemical Letters 2021年第7期32卷 2342-2346页

作者： guangze Nie Shijun Qiu Xiang Wang Yan Du Qingrui Zhang yang Zhang Hengle Zhang School of Environmental Science and Engineering Nanjing Tech UniversityNanjing 211816China Hebei Key Laboratory of Heavy Metal Deep-Remediation in Water and Resource Reuse Yanshan UniversityQinhuangdao 066004China

Molybdenum disulfide(MoS_(2))has excellent trapping ability for lead ions whereas its micro-/nanoscale size has greatly impeded its practical applications in the flow-through ***,a millimetersized nanocomposite MoS_(2)-001 was synthesized for Pb^(2+)removal by loading MoS_(2) nanosheets into a polystyrene cation exchanger D-001 by a facile hydrothermal *** proposed structure and adsorption mechanism of MoS_(2)-001 was confirmed by the scanning electron microscopy(SEM),transmission electron microscopy(TEM),X-ray diffraction(XRD),and X-ray photoelectron spectro scopy(XPS)*** nanocomposite showed outstanding adsorption capacity and rapid adsorption kinetic for Pb^(2+)removal,and the adsorption behavior followed the Langmuir adsorption model and pseudo-firstmodel kinetic ***^(2+)uptake by MoS_(2)-001 still maintains a high level even in the presence of extremely highly competitive ions(Ca(Ⅱ)and Mg(Ⅱ)),suggesting its high selectivity for Pb^(2+)***,the fixed-bed column experiments further certified that MoS_(2)-001 is of great potential for Pb^(2+)removal from the wastewater in practical engineering *** more gratifying is that the exhausted MoS_(2)-001 can be regenerated by NaCl-EDTANa_(2) solution without any significant adsorption capacity ***,all the results indicated that MoS_(2)-001 is a promising candidate adsorbent for lead-containing wastewater treatment.

关键词： Molybdenum disulfide Polystyrene host Lead removal Nanocomposite Adsorption

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维氏气单胞菌对斑马鱼胚胎发育的阻滞

水产科学 2024年第4期43卷 630-639页

作者：熊广泽张怡晴刘子琦张铭琪张焱武汉外国语学校湖北武汉430022 华中师范大学生命科学学院湖北武汉430079

维氏气单胞菌是一种能感染人-兽-水生动物的革兰氏阴性病原菌。本试验分析了不同密度(2.2×10^(8)、1.1×10^(8)cfu/mL和5.5×10^(7)cfu/mL)的维氏气单胞菌对斑马鱼胚胎在受精后3 h到56 h胚胎形态学发育的影响及原因。通过形态学观察及... 详细信息

维氏气单胞菌是一种能感染人-兽-水生动物的革兰氏阴性病原菌。本试验分析了不同密度(2.2×10^(8)、1.1×10^(8)cfu/mL和5.5×10^(7)cfu/mL)的维氏气单胞菌对斑马鱼胚胎在受精后3 h到56 h胚胎形态学发育的影响及原因。通过形态学观察及数据统计、转录组分析和荧光定量PCR检测方法结果显示,维氏气单胞菌浸染斑马鱼胚胎后,不仅导致其死亡率增高,而且存活胚胎的发育显著延迟。维氏气单胞菌的密度越高,胚胎发育延迟的程度就越高,在密度为2.2×10^(8)cfu/mL的维氏气单胞菌感染下,斑马鱼胚胎发育时期阻滞在受精后8~14 h。转录组结果显示,维氏气单胞菌影响了斑马鱼胚胎与发育过程相关的基因表达,受影响的大部分基因的功能集中在中胚层的发育,尤其是胚胎的背腹侧分化中。本试验结果表明,维氏气单胞菌对斑马鱼发育具有一定的阻滞作用,原因可能是维氏气单胞菌改变了中胚层发育背腹侧分化相关基因的表达量或其上游调控因子活性。

关键词：维氏气单胞菌斑马鱼发育阻滞胚胎

Allometric models for leaf area and leaf mass predictions across different growing seasons of elm tree(Ulmus japonica)

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Journal of Forestry Research 2017年第5期28卷 975-982页

作者： Huiying Cai Xueying Di guangze Jin Center for Ecological Research Northeast Forestry University School of Forestry Northeast Forestry University

Convenient and effective methods to determine seasonal changes in individual leaf area (LA) and leaf mass (LM) of plants are useful in research on plant physiology and forest ecology. However, practical methods for estimating LA and LM of elm (Ulmus japonica) leaves in different periods have rarely been reported. We collected sample elm leaves in June, July and September. Then, we developed allometric models relating LA, LM and leaf parameters, such as leaf length (L) and width (W) or the product of L and W (LW). Our objective was to find optimal allometric models for conveniently and effectively estimating LA and LM of elm leaves in different periods. LA and LM were significantly correlated with leaf parameters (P < 0.05), and allometric models with LW as an independent variable were best for estimating LA and LM in each period. A linear model was separately developed to predict LA of elm leaves in June, July and September, and it yielded high accuracies of 93, 96 and 96%, respectively. Similarly, a specific allometric model for predicting LM was developed separately in three periods, and the optimal model form in both June and July was a power model, but the linear model was optimal for September. The accuracies of the allometric models in predicting LM were 88, 83 and 84% for June, July and September, respectively. The error caused by ignoring seasonal variation of allometric models in predicting LA and LM in the three periods were 1-4 and 16-59%, respectively.

关键词： Leaf length Leaf width Linear model Power model Non-destructive method