活动范围对青鳉鱼
Haiyang yu huzhao重尾分布现象广泛存在于自然界的各种生物运动模式之中，重尾分布现象会随环境的变化而变化。鱼类为适应生存环境，往往会选择更加高效的个体运动模式。以青鳉鱼(Oryzias latipes)为研究对象，在相同浅水条件(5 cm)下，控制其活动范围，探究青鳉鱼在不同水域面积(1.0 m×1.0 m、0.6 m×0.6 m、0.4 m×0.4 m、0.2 m×0.2 m以及0.1 m×0.1 m)条件下的运动模式。利用MATLAB软件将青鳉鱼的运动轨迹转换为具体数据，通过移动速度、移动加速度 ...
龚 晓斌 +5 more
doaj +1 more source
, 2019 近年来,深度学习技术的快速发展推动了机器学习的广泛应用.其中,储备池计算(Reservoir Computing)方法由于在混沌时间序列预测方面的卓越效果而受到了越来越多的重视,形成了一个新的研究热点.本文以传统的长短期记忆网络(LSTM)和全连接层作为模型的基础,构建了基于循环神经网络的LSTM学习机.在仿真实验中,我们以平均有效预测时间作为度量指标,使用模型对洛伦兹系统的状态变量进行预测,并针对混沌系统特殊的动力学性质,为模型搭配了四项策略来辅助预测.结果表明, LSTM学习机搭配合适的组合策略 ...
熊有成, 赵鸿
core
Shiyou jixie, 2012 针对现有油气管道防腐补口施工中开放式管道表面处理存在的环境污染严重、工人劳动强度大、粉尘危害工人健康、砂料浪费严重及过程质量难以控制等一系列问题，设计了一种油气管道防腐补口自动除锈机。该除锈机为三瓣式开合结构，主要由浮动式旋转机构、限位机构、横向行走机构和除静电机构组成，工作过程为“弓”字形轨迹除锈。试验及现场应用效果表明，油气管道防腐补口自动除锈机结构合理、性能稳定、操作简单、野外适应能力强，除锈连续无遗漏，除锈质量等级大于Sa 2.5级，每道口的平均除锈时间为8 min，可有效节约工时。
王长江 +4 more
doaj
Development of a power recovery-based dynamic loading system for full-size drill rods in coal mines [PDF]
ObjectiveThis study aims to simulate the actual forces applied to drill rods during the borehole drilling for gas drainage from underground coal mines to satisfy the requirements of drill rods’ fatigue tests.
Jie WANG, Jing ZHANG
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Optimization and application of sand bailing technology for coalbed methane horizontal wells [PDF]
Objective and Methods Coalbed methane (CBM) horizontal wells face challenges such as sand accumulation in completion strings, pipe wall scaling, and pump sticking, leading to declined CBM production or shutdown of these wells.
Bao’an XIAN +10 more
core +1 more source
The geometric shape of a fourth-order NUAT-B spline curve(4阶NUAT-B样条曲线的几何形状)
Zhejiang Daxue xuebao. Lixue banTo investigate the relationship between spline representation and geometric representation, the geometric shape of the 4th-order non-uniform algebraic triangular B spline (NUAT-B spline) is exploited.
CHEN Haiwei(陈海伟) +2 more
doaj +1 more source
Gaoya dianqi针对全钒液流电池（VFB）储能系统在传统恒功率充放电控制下存在的初始电流冲击大和能量利用率低等问题，文中提出一种基于功率自适应的充放电控制策略。该策略通过自适应功率调节机制，动态优化充放电功率轨迹：在充放电初期有效抑制电流冲击，延长电池寿命；在末期则动态调节功率变化速率，使端电压逼近截止电压，拓宽荷电状态（SOC）可用区间，实现深度充放电，避免因触及电压限制而降低利用率。为全面反映电池运行特性，建立了涵盖电气、电化学、流体力学及温度场的VFB多物理场耦合模型，并给出了功率自适应控制策略的控制框图和算法 ...
张红 +5 more
doaj
Aerodynamic Drag Characteristics and Optimization Design of Ultra-High Speed Multi-Car in Gravity Energy Storage Shaft [PDF]
[Objective] As a physical energy storage method characterized by both environmental protection and economic efficiency, gravity energy storage is expected to become an important support for the sustainable development of renewable energy in the future ...
Hao LI +7 more
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Research progress and breakthrough directions of the key technical fields for large scale and efficient exploration and development of coalbed methane in Xinjiang [PDF]
The Xinjiang Uygur Autonomous Region has presented the expected resource conditions and work foundations for a large-scale coalbed methane (CBM) exploration and development, which shows that its CBM resources below the depth of 2000 m are 7.5 trillion m3,
Bo WEI +12 more
core +1 more source
Research on hole protection technology of screen pipe for hydraulic transportation and automatic butt joint in high position directional borehole [PDF]
Ensuring the stable extraction of high position directional long boreholes in the mining process of working face is the premise of realizing ' replacing the roadway with the boreholes', and the use of screen pipe completion is an effective hole ...
Jinbao ZHANG
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