Over the past years,many efforts have been accomplished to achieve fast and accurate meta-heuristic algorithms to optimize a variety of real-world problems.This study presents a new optimization method based on an unu...Over the past years,many efforts have been accomplished to achieve fast and accurate meta-heuristic algorithms to optimize a variety of real-world problems.This study presents a new optimization method based on an unusual geological phenomenon in nature,named Geyser inspired Algorithm(GEA).The mathematical modeling of this geological phenomenon is carried out to have a better understanding of the optimization process.The efficiency and accuracy of GEA are verified using statistical examination and convergence rate comparison on numerous CEC 2005,CEC 2014,CEC 2017,and real-parameter benchmark functions.Moreover,GEA has been applied to several real-parameter engineering optimization problems to evaluate its effectiveness.In addition,to demonstrate the applicability and robustness of GEA,a comprehensive investigation is performed for a fair comparison with other standard optimization methods.The results demonstrate that GEA is noticeably prosperous in reaching the optimal solutions with a high convergence rate in comparison with other well-known nature-inspired algorithms,including ABC,BBO,PSO,and RCGA.Note that the source code of the GEA is publicly available at https://www.optim-app.com/projects/gea.展开更多
Considering that we still do not fully understand the behavior of air pockets trapped in rainstorm systems and water flow changes inside pipes,the study of actual geysers presents many challenges.In this study,three-d...Considering that we still do not fully understand the behavior of air pockets trapped in rainstorm systems and water flow changes inside pipes,the study of actual geysers presents many challenges.In this study,three-dimensional numerical models were developed to investigate the mechanisms of geyser events triggered by rapid filling flows at different scales.The results showed that,in the first stage of the water–air mixture of the prototype model,a large amount of air was released quickly,and the subsequent overflow lasted for a more extended period.The transport capacity of the downstream pipe,as a critical factor,significantly influenced the water–air interaction of the geyser.Restricting the outlet area and increasing the outlet pressure simultaneously resulted in a stronger geyser.The equivalent density of the water–air mixture increased as the scale decreased during the geyser event.展开更多
The origin of life on Earth remains enigmatic with diverse models and debates.Here we discuss essential requirements for the first emergence of life on our planet and propose the following nine requirements:(1)an ener...The origin of life on Earth remains enigmatic with diverse models and debates.Here we discuss essential requirements for the first emergence of life on our planet and propose the following nine requirements:(1)an energy source(ionizing radiation and thermal energy);(2)a supply of nutrients(P.K.REE.etc.);(3)a supply of life-constituting major elements;(4)a high concentration of reduced gases such as CH4,HCN and NH3;(5)dry-wet cycles to create membranes and polymerize RNA;(6)a non-toxic aqueous environment;(7)Na-poor water;(8)highly diversified environments,and(9)cyclic conditions,such as dayto-night,hot-to-cold etc.Based on these nine requirements,we evaluate previously proposed locations for the origin of Earth’s life,including:(1)Darwin’s"warm little pond",leading to a"prebiotic soup"for life;(2)panspermia or Neo-panspermia(succession model of panspermia);(3)transportation from/through Mars;(4)a deepsea hydrothermal system;(5)an on-land subduct ion-zone hot spring,and(6)a geyser systems driven by a natural nuclear reactor.We conclude that location(6)is the most ideal candidate for the o rigin point for Earth’s life because of its efficiency in continuously supplying both the energy and the necessary materials for life,thereby maintaining the essential"cradle"for its initial development.We also emphasize that falsifiable working hypothesis provides an important tool to evaluate one of the biggest mysteries of the universe-the origin of life.展开更多
Intrigued by videos of erupting geysers, we wished to find out how these wonders of nature work. The questions we asked were: how does a geyser operate? What causes its periodicity? What are its different eruptive pha...Intrigued by videos of erupting geysers, we wished to find out how these wonders of nature work. The questions we asked were: how does a geyser operate? What causes its periodicity? What are its different eruptive phases? To answer these questions, we built a model of a geyser of variable height, while respecting the main characteristics of natural geysers. Using the model, we collected pressure and temperature data with sensors and a data acquisition card. In particular, we discovered how the duration of an eruptive cycle varies, why there is overpressure at the beginning of an eruption, and why some eruptions begin normally but then shift to a continuous boiling regime without replenishment. We also provide models for depressurization and for replenishment.展开更多
深层隧道排水系统(深隧)是布置于深层地下的大型排水工程,一般由调蓄隧道、入流竖井、通风设施(排气井)及排水泵站组成,具有调蓄雨洪及控制溢流污染的作用。其中调蓄隧道为避开地铁等城市地下工程往往布置于距离地面30~60 m深处,入流竖...深层隧道排水系统(深隧)是布置于深层地下的大型排水工程,一般由调蓄隧道、入流竖井、通风设施(排气井)及排水泵站组成,具有调蓄雨洪及控制溢流污染的作用。其中调蓄隧道为避开地铁等城市地下工程往往布置于距离地面30~60 m深处,入流竖井连接地表浅层管网和深层隧道。深隧系统竖井内部的水力学特性复杂,具有单宽流量大、落差高及大量掺气等特点,处理不当将造成较大的破坏。而极端降雨期间,由于未能充分排气而产生的间歇喷涌,也会对设施造成损害。本研究采用物理模型试验和水-气两相流数学模型CLSVOF(Coupling Level Set and Volume Of Fluid),研究了不同结构竖井(旋流式竖井和螺旋阶梯式竖井)水力学特性和调蓄隧道中的间歇喷涌问题。根据施工条件设计的两种竖井方案的消能率接近,旋流竖井存在负压及较大震动、排气不畅,而螺旋阶梯式竖井流速较低且流态稳定。在对调蓄隧道中"间歇喷涌"的数值模拟研究中,排气井管径对间歇喷涌的影响十分显著,模拟情景中最剧烈的喷涌会产生5.35倍初始状态下的测压管水头和38.2 m/s的喷涌速度。展开更多
文摘Over the past years,many efforts have been accomplished to achieve fast and accurate meta-heuristic algorithms to optimize a variety of real-world problems.This study presents a new optimization method based on an unusual geological phenomenon in nature,named Geyser inspired Algorithm(GEA).The mathematical modeling of this geological phenomenon is carried out to have a better understanding of the optimization process.The efficiency and accuracy of GEA are verified using statistical examination and convergence rate comparison on numerous CEC 2005,CEC 2014,CEC 2017,and real-parameter benchmark functions.Moreover,GEA has been applied to several real-parameter engineering optimization problems to evaluate its effectiveness.In addition,to demonstrate the applicability and robustness of GEA,a comprehensive investigation is performed for a fair comparison with other standard optimization methods.The results demonstrate that GEA is noticeably prosperous in reaching the optimal solutions with a high convergence rate in comparison with other well-known nature-inspired algorithms,including ABC,BBO,PSO,and RCGA.Note that the source code of the GEA is publicly available at https://www.optim-app.com/projects/gea.
基金supported by the National Key Laboratory of Water Disaster Prevention(Grant No.2021492011)the Natural Science Foundation of Zhejiang Province(Grant No.LQ22E090002).
文摘Considering that we still do not fully understand the behavior of air pockets trapped in rainstorm systems and water flow changes inside pipes,the study of actual geysers presents many challenges.In this study,three-dimensional numerical models were developed to investigate the mechanisms of geyser events triggered by rapid filling flows at different scales.The results showed that,in the first stage of the water–air mixture of the prototype model,a large amount of air was released quickly,and the subsequent overflow lasted for a more extended period.The transport capacity of the downstream pipe,as a critical factor,significantly influenced the water–air interaction of the geyser.Restricting the outlet area and increasing the outlet pressure simultaneously resulted in a stronger geyser.The equivalent density of the water–air mixture increased as the scale decreased during the geyser event.
基金supported by MEXT KAKENHI:Grant-in-Aid for Scientific Research on Innovative Areas,Grant Numbers26106002,26106004,26106006the Ministry of Education and Science of the Russian Federation,Project No.14.Y26.31.0018
文摘The origin of life on Earth remains enigmatic with diverse models and debates.Here we discuss essential requirements for the first emergence of life on our planet and propose the following nine requirements:(1)an energy source(ionizing radiation and thermal energy);(2)a supply of nutrients(P.K.REE.etc.);(3)a supply of life-constituting major elements;(4)a high concentration of reduced gases such as CH4,HCN and NH3;(5)dry-wet cycles to create membranes and polymerize RNA;(6)a non-toxic aqueous environment;(7)Na-poor water;(8)highly diversified environments,and(9)cyclic conditions,such as dayto-night,hot-to-cold etc.Based on these nine requirements,we evaluate previously proposed locations for the origin of Earth’s life,including:(1)Darwin’s"warm little pond",leading to a"prebiotic soup"for life;(2)panspermia or Neo-panspermia(succession model of panspermia);(3)transportation from/through Mars;(4)a deepsea hydrothermal system;(5)an on-land subduct ion-zone hot spring,and(6)a geyser systems driven by a natural nuclear reactor.We conclude that location(6)is the most ideal candidate for the o rigin point for Earth’s life because of its efficiency in continuously supplying both the energy and the necessary materials for life,thereby maintaining the essential"cradle"for its initial development.We also emphasize that falsifiable working hypothesis provides an important tool to evaluate one of the biggest mysteries of the universe-the origin of life.
文摘Intrigued by videos of erupting geysers, we wished to find out how these wonders of nature work. The questions we asked were: how does a geyser operate? What causes its periodicity? What are its different eruptive phases? To answer these questions, we built a model of a geyser of variable height, while respecting the main characteristics of natural geysers. Using the model, we collected pressure and temperature data with sensors and a data acquisition card. In particular, we discovered how the duration of an eruptive cycle varies, why there is overpressure at the beginning of an eruption, and why some eruptions begin normally but then shift to a continuous boiling regime without replenishment. We also provide models for depressurization and for replenishment.
文摘深层隧道排水系统(深隧)是布置于深层地下的大型排水工程,一般由调蓄隧道、入流竖井、通风设施(排气井)及排水泵站组成,具有调蓄雨洪及控制溢流污染的作用。其中调蓄隧道为避开地铁等城市地下工程往往布置于距离地面30~60 m深处,入流竖井连接地表浅层管网和深层隧道。深隧系统竖井内部的水力学特性复杂,具有单宽流量大、落差高及大量掺气等特点,处理不当将造成较大的破坏。而极端降雨期间,由于未能充分排气而产生的间歇喷涌,也会对设施造成损害。本研究采用物理模型试验和水-气两相流数学模型CLSVOF(Coupling Level Set and Volume Of Fluid),研究了不同结构竖井(旋流式竖井和螺旋阶梯式竖井)水力学特性和调蓄隧道中的间歇喷涌问题。根据施工条件设计的两种竖井方案的消能率接近,旋流竖井存在负压及较大震动、排气不畅,而螺旋阶梯式竖井流速较低且流态稳定。在对调蓄隧道中"间歇喷涌"的数值模拟研究中,排气井管径对间歇喷涌的影响十分显著,模拟情景中最剧烈的喷涌会产生5.35倍初始状态下的测压管水头和38.2 m/s的喷涌速度。
