Contemporary methods for visualizing phenotypic evolution,such as phylomorphospaces,often reveal patter ns which depart strongly from a naive expectation of con siste ntly divergent branchi ng and expansion.Instead,br...Contemporary methods for visualizing phenotypic evolution,such as phylomorphospaces,often reveal patter ns which depart strongly from a naive expectation of con siste ntly divergent branchi ng and expansion.Instead,branches regularly crisscross as convergence,reversals,or other forms of homoplasy occur,forming patterns described as"birds'nests","flies in vials",or less elegantly,"a mess".In other words,the phenotypic tree of life often appears highly tangled.Various explanations are given for this,such as differential degrees of developmental constraint,adaptation,or lack of adaptation.However,null expectations for the magnitude of disorder or"tangling"have never been established,so it is unclear which or even whether various evolutionary factors are required to explain messy patter ns of evolution.I simulated evolution along phyloge nies under a number of varying parameters(number of taxa and number of traits)and models(Brownian motion,Ornstein-Uhlenbeck(OU)-based,early burst,and character displacement(CD) and quantified disorder using 2 measures.All models produce substantial amounts of disorder.Disorder increases with tree size and the number of phenotypic traits.OU models produced the largest amounts of disorder-adaptive peaks influence lineages to evolve within restricted areas,with concomitant in creases in crossing of branches and density of evolution.Large early cha nges in trait values can be important in minimizing disorder.CD consistently produced trees with low(but not absent)disorder.Overall,neither constraints nor a lack of adaptation is required to explain messy phylomorphospaces-both stochastic and deterministic processes can act to produce the tantalizingly tangled phenotypic tree of life.展开更多
The geometric characteristics of fractures within a rock mass can be inferred by the data sampling from boreholes or exposed surfaces.Recently,the universal elliptical disc(UED)model was developed to represent natural...The geometric characteristics of fractures within a rock mass can be inferred by the data sampling from boreholes or exposed surfaces.Recently,the universal elliptical disc(UED)model was developed to represent natural fractures,where the fracture is assumed to be an elliptical disc and the fracture orientation,rotation angle,length of the long axis and ratio of short-long axis lengths are considered as variables.This paper aims to estimate the fracture size-and azimuth-related parameters in the UED model based on the trace information from sampling windows.The stereological relationship between the trace length,size-and azimuth-related parameters of the UED model was established,and the formulae of the mean value and standard deviation of trace length were proposed.The proposed formulae were validated via the Monte Carlo simulations with less than 5%of error rate between the calculated and true values.With respect to the estimation of the size-and azimuth-related parameters using the trace length,an optimization method was developed based on the pre-assumed size and azimuth distribution forms.A hypothetical case study was designed to illustrate and verify the parameter estimation method,where three combinations of the sampling windows were used to estimate the parameters,and the results showed that the estimated values could agree well with the true values.Furthermore,a hypothetical three-dimensional(3D)elliptical fracture network was constructed,and the circular disc,non-UED and UED models were used to represent it.The simulated trace information from different models was compared,and the results clearly illustrated the superiority of the proposed UED model over the existing circular disc and non-UED models。展开更多
This paper proposes a case study in the control of a heavy oil pyrolysis/cracking furnace with a newly extended U-model based pole placement controller(U-PPC). The major work of the paper includes: 1) establishing a c...This paper proposes a case study in the control of a heavy oil pyrolysis/cracking furnace with a newly extended U-model based pole placement controller(U-PPC). The major work of the paper includes: 1) establishing a control oriented nonlinear dynamic model with Naphtha cracking and thermal dynamics; 2) analysing a U-model(i.e., control oriented prototype) representation of various popular process model sets; 3)designing the new U-PPC to enhance the control performance in pole placement and stabilisation; 4) taking computational bench tests to demonstrate the control system design and performance with a user-friendly step by step procedure.展开更多
It is difficult to obtain the desired strip shape using Sendzimir rolling mills because small diameter work rolls can be easily deformed by the roiling force. To control the strip shape effectively, it is important to...It is difficult to obtain the desired strip shape using Sendzimir rolling mills because small diameter work rolls can be easily deformed by the roiling force. To control the strip shape effectively, it is important to understand the relationship between the behavior of the shape actuator and the variation of the strip shape. A numerical model based on the contact element method was proposed for the prediction of strip shape. In this numerical model, the re- lationships between the actuating forces, the roll deflections, the thickness profiles of the entry and exit sides, and the strip shape were considered. The proposed numerical model for strip shape prediction was evaluated by computer simulation and experiment with respect to various AS-U roll and first intermediate roll positions.展开更多
基金Dr Martha Muiioz and the editorial staff at Current Zoology were exceptionally accommodating when the original deadline for submission was complicated by COVID-19I thank them for their patience and understanding through the submission process.I also thank the executive and handling editors,and D.Adams,B.Sidlauskas,and an anonymous reviewer for helpful comments and extensive efforts on behalf of this manuscript。
文摘Contemporary methods for visualizing phenotypic evolution,such as phylomorphospaces,often reveal patter ns which depart strongly from a naive expectation of con siste ntly divergent branchi ng and expansion.Instead,branches regularly crisscross as convergence,reversals,or other forms of homoplasy occur,forming patterns described as"birds'nests","flies in vials",or less elegantly,"a mess".In other words,the phenotypic tree of life often appears highly tangled.Various explanations are given for this,such as differential degrees of developmental constraint,adaptation,or lack of adaptation.However,null expectations for the magnitude of disorder or"tangling"have never been established,so it is unclear which or even whether various evolutionary factors are required to explain messy patter ns of evolution.I simulated evolution along phyloge nies under a number of varying parameters(number of taxa and number of traits)and models(Brownian motion,Ornstein-Uhlenbeck(OU)-based,early burst,and character displacement(CD) and quantified disorder using 2 measures.All models produce substantial amounts of disorder.Disorder increases with tree size and the number of phenotypic traits.OU models produced the largest amounts of disorder-adaptive peaks influence lineages to evolve within restricted areas,with concomitant in creases in crossing of branches and density of evolution.Large early cha nges in trait values can be important in minimizing disorder.CD consistently produced trees with low(but not absent)disorder.Overall,neither constraints nor a lack of adaptation is required to explain messy phylomorphospaces-both stochastic and deterministic processes can act to produce the tantalizingly tangled phenotypic tree of life.
基金funded by National Natural Science Foundation of China(Grant No.41972264)Zhejiang Provincial Natural Science Foundation of China(Grant No.LR22E080002)the Observation and Research Station of Geohazards in Zhejiang,Ministry of Natural Resources,China(Grant No.ZJDZGCZ-2021).
文摘The geometric characteristics of fractures within a rock mass can be inferred by the data sampling from boreholes or exposed surfaces.Recently,the universal elliptical disc(UED)model was developed to represent natural fractures,where the fracture is assumed to be an elliptical disc and the fracture orientation,rotation angle,length of the long axis and ratio of short-long axis lengths are considered as variables.This paper aims to estimate the fracture size-and azimuth-related parameters in the UED model based on the trace information from sampling windows.The stereological relationship between the trace length,size-and azimuth-related parameters of the UED model was established,and the formulae of the mean value and standard deviation of trace length were proposed.The proposed formulae were validated via the Monte Carlo simulations with less than 5%of error rate between the calculated and true values.With respect to the estimation of the size-and azimuth-related parameters using the trace length,an optimization method was developed based on the pre-assumed size and azimuth distribution forms.A hypothetical case study was designed to illustrate and verify the parameter estimation method,where three combinations of the sampling windows were used to estimate the parameters,and the results showed that the estimated values could agree well with the true values.Furthermore,a hypothetical three-dimensional(3D)elliptical fracture network was constructed,and the circular disc,non-UED and UED models were used to represent it.The simulated trace information from different models was compared,and the results clearly illustrated the superiority of the proposed UED model over the existing circular disc and non-UED models。
基金partially supported by the National Natural Science Foundation of China(61273188,61473312)Taishan Scholar Construction Engineering Special Funding of Shandong
文摘This paper proposes a case study in the control of a heavy oil pyrolysis/cracking furnace with a newly extended U-model based pole placement controller(U-PPC). The major work of the paper includes: 1) establishing a control oriented nonlinear dynamic model with Naphtha cracking and thermal dynamics; 2) analysing a U-model(i.e., control oriented prototype) representation of various popular process model sets; 3)designing the new U-PPC to enhance the control performance in pole placement and stabilisation; 4) taking computational bench tests to demonstrate the control system design and performance with a user-friendly step by step procedure.
基金supported by the National Natural Science Foundation of China [grant number 42276008]the Laoshan Laboratory[grant number LSKJ202202403-2]+2 种基金supported by the National Natural Science Foundation of China [grant number 42030410]the Strategic Priority Research Program of the Chinese Academy of Sciences [grant number XDB40000000]the Startup Foundation for Introducing Talent of NUIST
基金Item Sponsored by Korea Science and Engineering Foundation(KOSEF)Grant Funded by Korea Government(MEST)(2010-0022521)
文摘It is difficult to obtain the desired strip shape using Sendzimir rolling mills because small diameter work rolls can be easily deformed by the roiling force. To control the strip shape effectively, it is important to understand the relationship between the behavior of the shape actuator and the variation of the strip shape. A numerical model based on the contact element method was proposed for the prediction of strip shape. In this numerical model, the re- lationships between the actuating forces, the roll deflections, the thickness profiles of the entry and exit sides, and the strip shape were considered. The proposed numerical model for strip shape prediction was evaluated by computer simulation and experiment with respect to various AS-U roll and first intermediate roll positions.
