BACKGROUND Atrial fibrillation(AF)represents a common arrhythmia with significant implications and may occur pre-,intra-,or postoperatively(POAF).After cardiac surgery POAF occurs in approximately 30% of patients,whil...BACKGROUND Atrial fibrillation(AF)represents a common arrhythmia with significant implications and may occur pre-,intra-,or postoperatively(POAF).After cardiac surgery POAF occurs in approximately 30% of patients,while non-cardiac/nonthoracic surgery has a reported incidence between 0.4% to 15%,with new onset POAF occurring at a rate of 0.4% to 3%.While AF has been extensively studied,it has not been well described in emergent non-cardiac surgery associated with increased surgical stress in an intensive care unit setting(ICU).AIM To investigate the incidence/predictors of POAF in emergent non-cardiac surgery and its associations with postoperative outcomes in the ICU.METHODS This retrospective study included patients≥18 years who underwent exploratory laparotomy or lower extremity amputation between October 2012 and September 2023 and were admitted in the ICU.Data of interest included occurrence of POAF,demographic characteristics,comorbidities,laboratory values,administered fluids,medications,and postoperative outcomes.Statistical analyses consisted of identifying predic-tors of POAF and associations of POAF with outcomes of interest.RESULTS A total of 347 ICU patients were included,16.4% had a history of AF,13.0% developed POAF,and 7.9%developed new-onset POAF.Patients with new-onset POAF were older(79.6±9.1 vs 68.1±14.8 years,<0.001),of white race(47.8%vs 28.8,P<0.001),hypertensive(87.0%vs 71.2%,P=0.011),had longer ICU length of stay(ICU-LOS)(13.4 vs 6.7 days,P=0.042),higher mortality(43.5%vs 17.6%,P=0.016)and higher rate of cardiac arrest(34.8%vs 14.6%,P=0.005)compared to patients without new-onset POAF.Multivariable analysis revealed increased POAF risk with advanced age(OR=1.06;95%CI:1.02-1.10,P=0.005),white race(OR=2.85;95%CI:1.26-6.76,P=0.014),high intraoperative fluid(OR>1;95%CI:1.00-1.00,P=0.018),and longer ICU-LOS(OR=1.04;95%CI:1.00-1.08,P=0.023).After adjusting for demographics,new onset POAF significantly predicted mortality(OR=3.07;95%CI:1.14-8.01,P=0.022).CONCLUSION POAF was associated with prolonged ICU-LOS,white race,and high intraoperative fluid.New-onset POAF was associated with increased risk of cardiac arrest and death in critically ill patients.展开更多
This article examines the critical integration of reflexivity,cultural sensitivity,and emergent design in qualitative psychiatry research focused on lived experiences.While quantitative methods offer essential clinica...This article examines the critical integration of reflexivity,cultural sensitivity,and emergent design in qualitative psychiatry research focused on lived experiences.While quantitative methods offer essential clinical insights,qualitative approaches provide a deeper understanding of the emotional,psychological,and social dimensions of mental health.Reflexivity enables researchers to remain aware of how their personal biases and professional backgrounds shape data interpretation.Cultural sensitivity ensures that mental health conditions are understood within their broader cultural contexts,helping avoid misrepresentation and promoting authentic participant expression.Emergent design offers flexibility in adapting the research process to evolving themes,particularly in the dynamic and multifaceted realm of psychiatric conditions.Together,these principles promote ethically sound,participant-centered research that captures the full complexity of lived experiences.The article also highlighted the practical implications of these principles for enhancing both academic knowledge and clinical practice in psychiatry.展开更多
In this paper we propose a two-layer emergent model for scalable swarm system. The first layer describes the indi-vidual flocking behavior to the local goal position (the center of minimal circumcircle decided by the ...In this paper we propose a two-layer emergent model for scalable swarm system. The first layer describes the indi-vidual flocking behavior to the local goal position (the center of minimal circumcircle decided by the neighbors in the positive visual set of individuals) resulting from the individual motion to one or two farthest neighbors in its positive visual set; the second layer describes the emergent aggregating swarm behavior resulting from the individual motion to its local goal position. The scale of the swarm will not be limited because only local individual information is used for modelling in the two-layer topology. We study the stability properties of the swarm emergent behavior based on Lyapunov stability theory. Simulations showed that the swarm system can converge to goal regions while maintaining cohesiveness.展开更多
Models disagree on a significant number of responses to climate change,such as climate feedback,regional changes,or the strength of equilibrium climate sensitivity.Emergent constraints aim to reduce these uncertaintie...Models disagree on a significant number of responses to climate change,such as climate feedback,regional changes,or the strength of equilibrium climate sensitivity.Emergent constraints aim to reduce these uncertainties by finding links between the inter-model spread in an observable predictor and climate projections.In this paper,the concepts underlying this framework are recalled with an emphasis on the statistical inference used for narrowing uncertainties,and a review of emergent constraints found in the last two decades.Potential links between highlighted predictors are explored,especially those targeting uncertainty reductions in climate sensitivity,cloud feedback,and changes of the hydrological cycle.Yet the disagreement across emergent constraints suggests that the spread in climate sensitivity can not be significantly narrowed.This calls for weighting the realism of emergent constraints by quantifying the level of physical understanding explaining the relationship.This would also permit more efficient model evaluation and better targeted model development.In the context of the upcoming CMIP6 model intercomparison a growing number of new predictors and uncertainty reductions is expected,which call for robust statistical inferences that allow cross-validation of more likely estimates.展开更多
The emergent task is a kind of uncertain event that satellite systems often encounter in the application process.In this paper,the multi-satellite distributed coordinating and scheduling problem considering emergent t...The emergent task is a kind of uncertain event that satellite systems often encounter in the application process.In this paper,the multi-satellite distributed coordinating and scheduling problem considering emergent tasks is studied.Due to the limitation of onboard computational resources and time,common online onboard rescheduling methods for such problems usually adopt simple greedy methods,sacrificing the solution quality to deliver timely solutions.To better solve the problem,a new multi-satellite onboard scheduling and coordinating framework based on multi-solution integration is proposed.This method uses high computational power on the ground and generates multiple solutions,changing the complex onboard rescheduling problem to a solution selection problem.With this method,it is possible that little time is used to generate a solution that is as good as the solutions on the ground.We further propose several multi-satellite coordination methods based on the multi-agent Markov decision process(MMDP)and mixed-integer programming(MIP).These methods enable the satellite to make independent decisions and produce high-quality solutions.Compared with the traditional centralized scheduling method,the proposed distributed method reduces the cost of satellite communication and increases the response speed for emergent tasks.Extensive experiments show that the proposed multi-solution integration framework and the distributed coordinating strategies are efficient and effective for onboard scheduling considering emergent tasks.展开更多
The emergent salt diapirs of the east Zagros, Iran have been investigated by their structural positions. The study area is including of Zagros orogeny belt and Persian Gulf that both of them have been formed on northe...The emergent salt diapirs of the east Zagros, Iran have been investigated by their structural positions. The study area is including of Zagros orogeny belt and Persian Gulf that both of them have been formed on northeastern part of Arabian plate. There are 84 emergent salt diapirs that originated from Hormuz formation with Infra-Cambrian to Cambrian age. Based on location, shape and orientation of the emergent salt domes in the east Zagros hinterland and Persian Gulf foreland basin, internal motivation forces in the salt deposits has been predominant compared to later tectonic forces. In the other words, most of the emergent salt diapirs are pre-orogenic diapirs and they had got prominent role as pines in determining the shape and location of next structures during to the Zagros orogeny. Finally, Neogene continental collision has a supplementary role to diapirism and salt reactivation. However there are an evidence to syn-orogenic emergent diapirs that they have got an important role in the progressive deformation.展开更多
Polarization singularities,which emerge from the incoherent superposition of two vector electric fields with the same frequency,and their evolution in free space are studied analytically and illustrated by numerical e...Polarization singularities,which emerge from the incoherent superposition of two vector electric fields with the same frequency,and their evolution in free space are studied analytically and illustrated by numerical examples.It is shown that there exist C-points,L-lines,in particular,C-lines in incoherently superimposed two-dimensional wavefields.Usually,the C-lines are unstable and disappear during the free-space propagation.The motion,pair creation-annihilation process of the emergent C-points,as well as the distortion of the L-lines may take place,and the degree of polarization of the emergent C-points varies upon propagation and may be less than 1.展开更多
Entanglement and the tunnel effect phenomena have been repeatedly observed and are generically accepted under orthodox quantum mechanics formalism. However, they remain rather inexplicable in the context of spacetime ...Entanglement and the tunnel effect phenomena have been repeatedly observed and are generically accepted under orthodox quantum mechanics formalism. However, they remain rather inexplicable in the context of spacetime usual conceptualization. In the present work, we suggest an alternative quantum mechanics formalism, refining the pilot-wave theory initially proposed by de Broglie. We suggest that spacetime is an emergent phenomenon from a prior subquantum medium and that entanglement and the tunnel effect can be explained in terms of a nonlinear relation between space and time that is imposed by subquantum waves.展开更多
Objective: Since its inception, the use of the percutaneous dilational tracheostomy (PDT) has been contraindicated in the setting of an emergent airway. Emerging in the literature are several cases of successful emerg...Objective: Since its inception, the use of the percutaneous dilational tracheostomy (PDT) has been contraindicated in the setting of an emergent airway. Emerging in the literature are several cases of successful emergent PDTs. Here we present our experience with the use of PDT in managing emergent airways. Study Design: All patients who underwent emergent PDT, using the Ciaglia Blue Rhino Introducer Set (Cook Critical Care, Bloomington,IN), in an academic county hospital setting between February 2010 and May 2012 were included in the study. Electronic medical records were reviewed for demographic and procedural data. Results: Twelve patients were included in the study with ages ranging from 20 to 87 (mean 57) years-old. The most common reason for emergent airway was trauma (7 patients), followed by obstructing neck mass (2 patients), septic shock (2 patients), and angioedema (1 patient). Seven PDTs were performed in the OR, four at bedside and one in the ER. Three of the 12 patients had emergent cricothyroidotomies in place that malfunctioned, requiring emergent conversion. No patients suffered from short term complications. One patient developed a neck abscess at the site of the PDT one month post operatively, two patients had accidental decanulation post operatively, and both were replaced without complication. Conclusions: PDT can be used in the emergent setting in the hands of trained practitioners with minimal complications. A larger, prospective trial is needed to make conclusions regarding patient care.展开更多
Several methods have been used to tailor nanomaterials structure and properties.Sometimes,slight changes in the structure outcomes expressive improvements in the optical and photocatalytic properties of semiconductor ...Several methods have been used to tailor nanomaterials structure and properties.Sometimes,slight changes in the structure outcomes expressive improvements in the optical and photocatalytic properties of semiconductor nanoparticles.In this context,the influence of the metal doping and the morphology on a catalyst performance was studied in this work.Here,ruthenium doped titanate nanotubes(RuTNT)were synthesised for the first time using an amorphous Ru-containing precursor.Afterwards,the photocatalytic performance of this sample was compared to the one obtained for ruthenium titanate nanowires(RuTNW),recently reported.Two samples,RuTNW and RuTNT,were produced using the same Ru-containing precursor but distinct hydrothermal methodologies.The powders were structural,morphological and optical characterized by X-ray diffraction and fluorescence,transmission electron microscopy,Raman,X-ray photoelectron and photoluminescence spectroscopies.Distinct variations on the structural and optical properties of the RuTNT and RuTNW nanoparticles,due to ruthenium incorporation were observed.Their potential use as photocatalysts was evaluated on the hydroxyl radical photo-assisted production.Both samples were catalytic for this reaction,presenting better performances than the pristine counterparts,being RuTNT the best photocatalyst.Subsequently,the degradation of two emergent pollutants,caffeine and sulfamethazine,was studied.RuTNT demonstrated to be better photocatalyst than RuTNW for caffeine but identical performances were obtained for sulfamethazine.For both catalysts,the degradation mechanism of the pollutants was explored through the identification and quantification of the intermediate compounds produced and several differences were found.This indicates the importance of the structural and morphological aspects of a material on its catalytic performance.展开更多
The combination of strong correlation and emergent lattice can be achieved when quantum gases are confined in a superradiant Fabry–Perot cavity.In addition to the discoveries of exotic phases,such as density wave ord...The combination of strong correlation and emergent lattice can be achieved when quantum gases are confined in a superradiant Fabry–Perot cavity.In addition to the discoveries of exotic phases,such as density wave ordered Mott insulator and superfluid,a surprising kink structure is found in the slope of the cavity strength as a function of the pumping strength.In this article,we show that the appearance of such a kink is a manifestation of a liquid–vapour-like transition between two superfluids with different densities.The slopes in the immediate neighborhood of the kink become divergent at the liquid–vapour critical points and display a critical scaling law with a critical exponent 1 in the quantum critical region.展开更多
Recent experiments [Guo et al., Phys. Rev. Lett. 124 206602(2020)] on thermodynamic properties of the frustrated layered quantum magnet SrCu_(2)(BO_(3))_(2)-the Shastry–Sutherland material-have provided strong eviden...Recent experiments [Guo et al., Phys. Rev. Lett. 124 206602(2020)] on thermodynamic properties of the frustrated layered quantum magnet SrCu_(2)(BO_(3))_(2)-the Shastry–Sutherland material-have provided strong evidence for a lowtemperature phase transition between plaquette-singlet and antiferromagnetic order as a function of pressure. Further motivated by the recently discovered unusual first-order quantum phase transition with an apparent emergent O(4) symmetry of the antiferromagnetic and plaquette-singlet order parameters in a two-dimensional "checkerboard J-Q" quantum spin model[Zhao et al., Nat. Phys. 15 678(2019)], we here study the same model in the presence of weak inter-layer couplings. Our focus is on the evolution of the emergent symmetry as the system crosses over from two to three dimensions and the phase transition extends from strictly zero temperature in two dimensions up to finite temperature as expected in SrCu_(2)(BO_(3))_(2).Using quantum Monte Carlo simulations, we map out the phase boundaries of the plaquette-singlet and antiferromagnetic phases, with particular focus on the triple point where these two ordered phases meet the paramagnetic phase for given strength of the inter-layer coupling. All transitions are first-order in the neighborhood of the triple point. We show that the emergent O(4) symmetry of the coexistence state breaks down clearly when the interlayer coupling becomes sufficiently large, but for a weak coupling, of the magnitude expected experimentally, the enlarged symmetry can still be observed at the triple point up to significant length scales. Thus, it is likely that the plaquette-singlet to antiferromagnetic transition in SrCu_(2)(BO_(3))_(2) exhibits remnants of emergent O(4) symmetry, which should be observable due to additional weakly gapped Goldstone modes.展开更多
The optimal vascular blood supply throughout the body guarantees the support of normal functions to tissues and organs.Implants are now becoming a seamless extension of the body and shall accompany a higher level of f...The optimal vascular blood supply throughout the body guarantees the support of normal functions to tissues and organs.Implants are now becoming a seamless extension of the body and shall accompany a higher level of fidelity between the device and the patient.As regenerative medicine is still in its infancy,the ongoing search for new and effective prosthetic alternatives continues to be essential and highly rewarding.Thanks in part to the progress of imaging and the benefits of 3D printing,previously unimagined emergent technologies are at hand.The emerging technologies of the last few decades and the near future will continue to greatly improve both the quality and quantity of patients' lives.They focus on minimally invasive technologies(keyhole surgery) and approaches for deployment of valves,stent-grafts,leadless pacemakers and adaptation of medical devices for destination therapy(assist devices and artificial hearts).In addition,specific blood conduits for the aortic valves together with the aortic arch and the pulmonary valves are considered.These breakthroughs are currently at various stages of development and acceptability.Innovative biomaterials were essential in the development of cardiovascular devices.They were and they still are the essential support for conduction prosthesis,but their place in signal prosthesis is being revisited.Any new development in medical devices has been frequently driven by surgeons and industry.The emergent technologies are introduced by pioneers.The risks and benefits of devices must be continuously reassessed during the lifetime of the implants based upon sound scientific principles of investigation,clinical experience of the users and retrieval programs.展开更多
In this paper, the model of inverse cascade fractal super-blocks along one direction (in the positive or negative) in the 3-dimensional space is developed to describe the self-similar motion in macromolecular system. ...In this paper, the model of inverse cascade fractal super-blocks along one direction (in the positive or negative) in the 3-dimensional space is developed to describe the self-similar motion in macromolecular system. Microscopically the cohesive and dispersed states of the motion blocks are co-existent states with vastly different probability of occurrence.Experimental results and theoretical analysis show that the microscopic cohesive state energy and dispersed state energy of each motion block are respectively equal to the macroscopic glassy state energy kT8 and molten state energy kTm of the system. This singularity unveils topologically the nonintegrability, mathematically the anholonomy, and macroscopically the emergent property. This singularity also reveals that the glass, viscoelastic and melt states are three distinct emergent properties of macromolecular motion from a macroscopic viewpoint. The fractal concept of excluded volume is introduced to depict the random motion at various scales in the system. The Hausdorff dimensions of the excluded volune and the motion blocks are both found equal to 3/2.展开更多
By interpreting multifractal L-function zero alignment as a decoherence process, the Riemann hypothesis is demonstrated to imply the emergence of classical phase space at zero alignment. This provides a conception of ...By interpreting multifractal L-function zero alignment as a decoherence process, the Riemann hypothesis is demonstrated to imply the emergence of classical phase space at zero alignment. This provides a conception of emergent dynamics in which decoherence leads to classical system formation, and classical system trajectories are characterized by modular forms.展开更多
Based on the screening analysis for the first time in Montenegro, water samples for the presence of emergent wereanalyzed. Results from the locality Vukovci, the lower course of the river Morale, have shown the presen...Based on the screening analysis for the first time in Montenegro, water samples for the presence of emergent wereanalyzed. Results from the locality Vukovci, the lower course of the river Morale, have shown the presence of chemical components that indicate the presence of emergent in the water. Thus identification component is associated with the presence of fiziological groups of microorganisms at the site, which with its functional and significant role in many ways reduce environmental stress.展开更多
At present, the Portuguese education system promotes the development of new literacies in all education levels in response to new requirements of the digital world which imply changes in children＇s education. In fact...At present, the Portuguese education system promotes the development of new literacies in all education levels in response to new requirements of the digital world which imply changes in children＇s education. In fact, reading and writing are no longer limited exclusively to books, rather they are associated with diversified digital media integrating text, sound, image, and video. In this context, we developed an exploratory study in a kindergarten with the children and their family members. Data were collected through participant observation, children conversational interviews, and digital narratives produced by children. Data analysis is based on content analysis with NVivo software support. The emergence of literacy is evident in verbal interactions in peer-group work, in contact with the written text, in ＂writing＂ in various media, and in sharing knowledge, discoveries, and digital narratives produced in an online community （http：//janelajardim.ning.com）. This paper presents： （1） a systematic literature review in the field of digital narrative and emergent literacy; （2） the description of children＇s activities concerning interactive multimodal narrative; （3） the results of this work; and （4） the conclusion about contribution of multimodal narratives to the emergence of reading, writing, and digital skills展开更多
The study investigated the university students＇ attitudes towards the coexistence of the standard discourse and the emergent discourses through a questionnaire. 223 sophomores in Xinjiang Normal University participat...The study investigated the university students＇ attitudes towards the coexistence of the standard discourse and the emergent discourses through a questionnaire. 223 sophomores in Xinjiang Normal University participated in the survey. The results show that these students tend to accept the emergent discourses in terms of their new vocabulary words, such as ＂yumi＂. Although the standard discourse dominates the students＇ life, the emergent discourses are accepted and used by these students. With regard to the view to purify the Chinese language, human concern and tolerance for the coexistence of various discourses are suggested.展开更多
At present, there are some resistible illegal operations aiming at creating false public opinions in internet public opinions on emergent event, which seriously disrupted the normal Internet order. However, the tradit...At present, there are some resistible illegal operations aiming at creating false public opinions in internet public opinions on emergent event, which seriously disrupted the normal Internet order. However, the traditional research method of internet public opinion pre-waming mainly relies on manual analysis, which is too inefficient to adapt to the analysis of massive internet public opinion information. According to the above analysis, this paper puts forward an internet public opinion pre-warning mechanism on emergent event based on multi-relational data clustering algorithm, discusses the specific pre-waming from the aspects of the state and dissemination of internet public opinions and the historical data, and automatically classifies the internet public opinions through multi-relational data clustering algorithm. And the results show that such method can be used to effectively study the internet public opinion pre-waming on emergent event, with the accuracy rate of as high as 95%.展开更多
文摘BACKGROUND Atrial fibrillation(AF)represents a common arrhythmia with significant implications and may occur pre-,intra-,or postoperatively(POAF).After cardiac surgery POAF occurs in approximately 30% of patients,while non-cardiac/nonthoracic surgery has a reported incidence between 0.4% to 15%,with new onset POAF occurring at a rate of 0.4% to 3%.While AF has been extensively studied,it has not been well described in emergent non-cardiac surgery associated with increased surgical stress in an intensive care unit setting(ICU).AIM To investigate the incidence/predictors of POAF in emergent non-cardiac surgery and its associations with postoperative outcomes in the ICU.METHODS This retrospective study included patients≥18 years who underwent exploratory laparotomy or lower extremity amputation between October 2012 and September 2023 and were admitted in the ICU.Data of interest included occurrence of POAF,demographic characteristics,comorbidities,laboratory values,administered fluids,medications,and postoperative outcomes.Statistical analyses consisted of identifying predic-tors of POAF and associations of POAF with outcomes of interest.RESULTS A total of 347 ICU patients were included,16.4% had a history of AF,13.0% developed POAF,and 7.9%developed new-onset POAF.Patients with new-onset POAF were older(79.6±9.1 vs 68.1±14.8 years,<0.001),of white race(47.8%vs 28.8,P<0.001),hypertensive(87.0%vs 71.2%,P=0.011),had longer ICU length of stay(ICU-LOS)(13.4 vs 6.7 days,P=0.042),higher mortality(43.5%vs 17.6%,P=0.016)and higher rate of cardiac arrest(34.8%vs 14.6%,P=0.005)compared to patients without new-onset POAF.Multivariable analysis revealed increased POAF risk with advanced age(OR=1.06;95%CI:1.02-1.10,P=0.005),white race(OR=2.85;95%CI:1.26-6.76,P=0.014),high intraoperative fluid(OR>1;95%CI:1.00-1.00,P=0.018),and longer ICU-LOS(OR=1.04;95%CI:1.00-1.08,P=0.023).After adjusting for demographics,new onset POAF significantly predicted mortality(OR=3.07;95%CI:1.14-8.01,P=0.022).CONCLUSION POAF was associated with prolonged ICU-LOS,white race,and high intraoperative fluid.New-onset POAF was associated with increased risk of cardiac arrest and death in critically ill patients.
文摘This article examines the critical integration of reflexivity,cultural sensitivity,and emergent design in qualitative psychiatry research focused on lived experiences.While quantitative methods offer essential clinical insights,qualitative approaches provide a deeper understanding of the emotional,psychological,and social dimensions of mental health.Reflexivity enables researchers to remain aware of how their personal biases and professional backgrounds shape data interpretation.Cultural sensitivity ensures that mental health conditions are understood within their broader cultural contexts,helping avoid misrepresentation and promoting authentic participant expression.Emergent design offers flexibility in adapting the research process to evolving themes,particularly in the dynamic and multifaceted realm of psychiatric conditions.Together,these principles promote ethically sound,participant-centered research that captures the full complexity of lived experiences.The article also highlighted the practical implications of these principles for enhancing both academic knowledge and clinical practice in psychiatry.
基金Project (No. 60574088) supported by the National Natural ScienceFoundation of China
文摘In this paper we propose a two-layer emergent model for scalable swarm system. The first layer describes the indi-vidual flocking behavior to the local goal position (the center of minimal circumcircle decided by the neighbors in the positive visual set of individuals) resulting from the individual motion to one or two farthest neighbors in its positive visual set; the second layer describes the emergent aggregating swarm behavior resulting from the individual motion to its local goal position. The scale of the swarm will not be limited because only local individual information is used for modelling in the two-layer topology. We study the stability properties of the swarm emergent behavior based on Lyapunov stability theory. Simulations showed that the swarm system can converge to goal regions while maintaining cohesiveness.
基金funding from the Agence Nationale de la Recherche (ANR) [grant HIGH-TUNE ANR-16-CE01-0010]
文摘Models disagree on a significant number of responses to climate change,such as climate feedback,regional changes,or the strength of equilibrium climate sensitivity.Emergent constraints aim to reduce these uncertainties by finding links between the inter-model spread in an observable predictor and climate projections.In this paper,the concepts underlying this framework are recalled with an emphasis on the statistical inference used for narrowing uncertainties,and a review of emergent constraints found in the last two decades.Potential links between highlighted predictors are explored,especially those targeting uncertainty reductions in climate sensitivity,cloud feedback,and changes of the hydrological cycle.Yet the disagreement across emergent constraints suggests that the spread in climate sensitivity can not be significantly narrowed.This calls for weighting the realism of emergent constraints by quantifying the level of physical understanding explaining the relationship.This would also permit more efficient model evaluation and better targeted model development.In the context of the upcoming CMIP6 model intercomparison a growing number of new predictors and uncertainty reductions is expected,which call for robust statistical inferences that allow cross-validation of more likely estimates.
基金supported by the National Natural Science Foundation of China(72001212,71701204,71801218)the China Hunan Postgraduate Research Innovating Project(CX2018B020)。
文摘The emergent task is a kind of uncertain event that satellite systems often encounter in the application process.In this paper,the multi-satellite distributed coordinating and scheduling problem considering emergent tasks is studied.Due to the limitation of onboard computational resources and time,common online onboard rescheduling methods for such problems usually adopt simple greedy methods,sacrificing the solution quality to deliver timely solutions.To better solve the problem,a new multi-satellite onboard scheduling and coordinating framework based on multi-solution integration is proposed.This method uses high computational power on the ground and generates multiple solutions,changing the complex onboard rescheduling problem to a solution selection problem.With this method,it is possible that little time is used to generate a solution that is as good as the solutions on the ground.We further propose several multi-satellite coordination methods based on the multi-agent Markov decision process(MMDP)and mixed-integer programming(MIP).These methods enable the satellite to make independent decisions and produce high-quality solutions.Compared with the traditional centralized scheduling method,the proposed distributed method reduces the cost of satellite communication and increases the response speed for emergent tasks.Extensive experiments show that the proposed multi-solution integration framework and the distributed coordinating strategies are efficient and effective for onboard scheduling considering emergent tasks.
文摘The emergent salt diapirs of the east Zagros, Iran have been investigated by their structural positions. The study area is including of Zagros orogeny belt and Persian Gulf that both of them have been formed on northeastern part of Arabian plate. There are 84 emergent salt diapirs that originated from Hormuz formation with Infra-Cambrian to Cambrian age. Based on location, shape and orientation of the emergent salt domes in the east Zagros hinterland and Persian Gulf foreland basin, internal motivation forces in the salt deposits has been predominant compared to later tectonic forces. In the other words, most of the emergent salt diapirs are pre-orogenic diapirs and they had got prominent role as pines in determining the shape and location of next structures during to the Zagros orogeny. Finally, Neogene continental collision has a supplementary role to diapirism and salt reactivation. However there are an evidence to syn-orogenic emergent diapirs that they have got an important role in the progressive deformation.
基金Project supported by the National Natural Science Foundation of China (Grant No. 10874125)
文摘Polarization singularities,which emerge from the incoherent superposition of two vector electric fields with the same frequency,and their evolution in free space are studied analytically and illustrated by numerical examples.It is shown that there exist C-points,L-lines,in particular,C-lines in incoherently superimposed two-dimensional wavefields.Usually,the C-lines are unstable and disappear during the free-space propagation.The motion,pair creation-annihilation process of the emergent C-points,as well as the distortion of the L-lines may take place,and the degree of polarization of the emergent C-points varies upon propagation and may be less than 1.
文摘Entanglement and the tunnel effect phenomena have been repeatedly observed and are generically accepted under orthodox quantum mechanics formalism. However, they remain rather inexplicable in the context of spacetime usual conceptualization. In the present work, we suggest an alternative quantum mechanics formalism, refining the pilot-wave theory initially proposed by de Broglie. We suggest that spacetime is an emergent phenomenon from a prior subquantum medium and that entanglement and the tunnel effect can be explained in terms of a nonlinear relation between space and time that is imposed by subquantum waves.
文摘Objective: Since its inception, the use of the percutaneous dilational tracheostomy (PDT) has been contraindicated in the setting of an emergent airway. Emerging in the literature are several cases of successful emergent PDTs. Here we present our experience with the use of PDT in managing emergent airways. Study Design: All patients who underwent emergent PDT, using the Ciaglia Blue Rhino Introducer Set (Cook Critical Care, Bloomington,IN), in an academic county hospital setting between February 2010 and May 2012 were included in the study. Electronic medical records were reviewed for demographic and procedural data. Results: Twelve patients were included in the study with ages ranging from 20 to 87 (mean 57) years-old. The most common reason for emergent airway was trauma (7 patients), followed by obstructing neck mass (2 patients), septic shock (2 patients), and angioedema (1 patient). Seven PDTs were performed in the OR, four at bedside and one in the ER. Three of the 12 patients had emergent cricothyroidotomies in place that malfunctioned, requiring emergent conversion. No patients suffered from short term complications. One patient developed a neck abscess at the site of the PDT one month post operatively, two patients had accidental decanulation post operatively, and both were replaced without complication. Conclusions: PDT can be used in the emergent setting in the hands of trained practitioners with minimal complications. A larger, prospective trial is needed to make conclusions regarding patient care.
基金Fundacao para a Ciencia e Tecnologia(FCT)(projects PEst-OE/QUI/QUI0612/2019 and IF/01210/2014)CICECO-Aveiro Institute of Materials(project POCI-01-0145FEDER-007679)financed by national funds through the FCT/MEC+2 种基金appropriate cofinanced by FEDER(Fundo Europeu de Desenvolvimento Regional)under the PT2020 Partnership AgreementFCT for her grant(No.SFRH/BD/101220/2014)funded by national funds(OE),through FCT。
文摘Several methods have been used to tailor nanomaterials structure and properties.Sometimes,slight changes in the structure outcomes expressive improvements in the optical and photocatalytic properties of semiconductor nanoparticles.In this context,the influence of the metal doping and the morphology on a catalyst performance was studied in this work.Here,ruthenium doped titanate nanotubes(RuTNT)were synthesised for the first time using an amorphous Ru-containing precursor.Afterwards,the photocatalytic performance of this sample was compared to the one obtained for ruthenium titanate nanowires(RuTNW),recently reported.Two samples,RuTNW and RuTNT,were produced using the same Ru-containing precursor but distinct hydrothermal methodologies.The powders were structural,morphological and optical characterized by X-ray diffraction and fluorescence,transmission electron microscopy,Raman,X-ray photoelectron and photoluminescence spectroscopies.Distinct variations on the structural and optical properties of the RuTNT and RuTNW nanoparticles,due to ruthenium incorporation were observed.Their potential use as photocatalysts was evaluated on the hydroxyl radical photo-assisted production.Both samples were catalytic for this reaction,presenting better performances than the pristine counterparts,being RuTNT the best photocatalyst.Subsequently,the degradation of two emergent pollutants,caffeine and sulfamethazine,was studied.RuTNT demonstrated to be better photocatalyst than RuTNW for caffeine but identical performances were obtained for sulfamethazine.For both catalysts,the degradation mechanism of the pollutants was explored through the identification and quantification of the intermediate compounds produced and several differences were found.This indicates the importance of the structural and morphological aspects of a material on its catalytic performance.
基金Beijing Natural Science Foundation(Z180013)NSFC under Grant No.12174358 and No.11734010.
文摘The combination of strong correlation and emergent lattice can be achieved when quantum gases are confined in a superradiant Fabry–Perot cavity.In addition to the discoveries of exotic phases,such as density wave ordered Mott insulator and superfluid,a surprising kink structure is found in the slope of the cavity strength as a function of the pumping strength.In this article,we show that the appearance of such a kink is a manifestation of a liquid–vapour-like transition between two superfluids with different densities.The slopes in the immediate neighborhood of the kink become divergent at the liquid–vapour critical points and display a critical scaling law with a critical exponent 1 in the quantum critical region.
基金the support from the RGC of Hong Kong SAR China (Grant Nos. GRF 17303019 and 17301420)the National Key Research and Development Program of China (Grant No. 2016YFA0300502)+3 种基金the Strategic Priority Research Program of the Chinese Academy of Sciences(Grant No. XDB33000000)support from the National Natural Science Foundation of China (Grant No. 12004020)AWS was supported by the NSF (Grant No. DMR-1710170)by the Simons Foundation (Grant No. 511064)。
文摘Recent experiments [Guo et al., Phys. Rev. Lett. 124 206602(2020)] on thermodynamic properties of the frustrated layered quantum magnet SrCu_(2)(BO_(3))_(2)-the Shastry–Sutherland material-have provided strong evidence for a lowtemperature phase transition between plaquette-singlet and antiferromagnetic order as a function of pressure. Further motivated by the recently discovered unusual first-order quantum phase transition with an apparent emergent O(4) symmetry of the antiferromagnetic and plaquette-singlet order parameters in a two-dimensional "checkerboard J-Q" quantum spin model[Zhao et al., Nat. Phys. 15 678(2019)], we here study the same model in the presence of weak inter-layer couplings. Our focus is on the evolution of the emergent symmetry as the system crosses over from two to three dimensions and the phase transition extends from strictly zero temperature in two dimensions up to finite temperature as expected in SrCu_(2)(BO_(3))_(2).Using quantum Monte Carlo simulations, we map out the phase boundaries of the plaquette-singlet and antiferromagnetic phases, with particular focus on the triple point where these two ordered phases meet the paramagnetic phase for given strength of the inter-layer coupling. All transitions are first-order in the neighborhood of the triple point. We show that the emergent O(4) symmetry of the coexistence state breaks down clearly when the interlayer coupling becomes sufficiently large, but for a weak coupling, of the magnitude expected experimentally, the enlarged symmetry can still be observed at the triple point up to significant length scales. Thus, it is likely that the plaquette-singlet to antiferromagnetic transition in SrCu_(2)(BO_(3))_(2) exhibits remnants of emergent O(4) symmetry, which should be observable due to additional weakly gapped Goldstone modes.
基金"111 Project" Biomedical Textile Material Science and Technology,China(No.B07024)National Natural Science Foundations of China(Nos.31100682,81371648)+2 种基金the Shanghai Construction of College Experiment Technique Team Project,China(No.101-07.0053014)the Fundamental Research Funds for the Central University,China(No.15D110126)the Department of Surgery at Laval University,Quebec and the Fonds de Recherche en Chirurgie Vasculaire of the CHU,Quebec,Canada
文摘The optimal vascular blood supply throughout the body guarantees the support of normal functions to tissues and organs.Implants are now becoming a seamless extension of the body and shall accompany a higher level of fidelity between the device and the patient.As regenerative medicine is still in its infancy,the ongoing search for new and effective prosthetic alternatives continues to be essential and highly rewarding.Thanks in part to the progress of imaging and the benefits of 3D printing,previously unimagined emergent technologies are at hand.The emerging technologies of the last few decades and the near future will continue to greatly improve both the quality and quantity of patients' lives.They focus on minimally invasive technologies(keyhole surgery) and approaches for deployment of valves,stent-grafts,leadless pacemakers and adaptation of medical devices for destination therapy(assist devices and artificial hearts).In addition,specific blood conduits for the aortic valves together with the aortic arch and the pulmonary valves are considered.These breakthroughs are currently at various stages of development and acceptability.Innovative biomaterials were essential in the development of cardiovascular devices.They were and they still are the essential support for conduction prosthesis,but their place in signal prosthesis is being revisited.Any new development in medical devices has been frequently driven by surgeons and industry.The emergent technologies are introduced by pioneers.The risks and benefits of devices must be continuously reassessed during the lifetime of the implants based upon sound scientific principles of investigation,clinical experience of the users and retrieval programs.
文摘In this paper, the model of inverse cascade fractal super-blocks along one direction (in the positive or negative) in the 3-dimensional space is developed to describe the self-similar motion in macromolecular system. Microscopically the cohesive and dispersed states of the motion blocks are co-existent states with vastly different probability of occurrence.Experimental results and theoretical analysis show that the microscopic cohesive state energy and dispersed state energy of each motion block are respectively equal to the macroscopic glassy state energy kT8 and molten state energy kTm of the system. This singularity unveils topologically the nonintegrability, mathematically the anholonomy, and macroscopically the emergent property. This singularity also reveals that the glass, viscoelastic and melt states are three distinct emergent properties of macromolecular motion from a macroscopic viewpoint. The fractal concept of excluded volume is introduced to depict the random motion at various scales in the system. The Hausdorff dimensions of the excluded volune and the motion blocks are both found equal to 3/2.
文摘By interpreting multifractal L-function zero alignment as a decoherence process, the Riemann hypothesis is demonstrated to imply the emergence of classical phase space at zero alignment. This provides a conception of emergent dynamics in which decoherence leads to classical system formation, and classical system trajectories are characterized by modular forms.
文摘Based on the screening analysis for the first time in Montenegro, water samples for the presence of emergent wereanalyzed. Results from the locality Vukovci, the lower course of the river Morale, have shown the presence of chemical components that indicate the presence of emergent in the water. Thus identification component is associated with the presence of fiziological groups of microorganisms at the site, which with its functional and significant role in many ways reduce environmental stress.
文摘At present, the Portuguese education system promotes the development of new literacies in all education levels in response to new requirements of the digital world which imply changes in children＇s education. In fact, reading and writing are no longer limited exclusively to books, rather they are associated with diversified digital media integrating text, sound, image, and video. In this context, we developed an exploratory study in a kindergarten with the children and their family members. Data were collected through participant observation, children conversational interviews, and digital narratives produced by children. Data analysis is based on content analysis with NVivo software support. The emergence of literacy is evident in verbal interactions in peer-group work, in contact with the written text, in ＂writing＂ in various media, and in sharing knowledge, discoveries, and digital narratives produced in an online community （http：//janelajardim.ning.com）. This paper presents： （1） a systematic literature review in the field of digital narrative and emergent literacy; （2） the description of children＇s activities concerning interactive multimodal narrative; （3） the results of this work; and （4） the conclusion about contribution of multimodal narratives to the emergence of reading, writing, and digital skills
文摘The study investigated the university students＇ attitudes towards the coexistence of the standard discourse and the emergent discourses through a questionnaire. 223 sophomores in Xinjiang Normal University participated in the survey. The results show that these students tend to accept the emergent discourses in terms of their new vocabulary words, such as ＂yumi＂. Although the standard discourse dominates the students＇ life, the emergent discourses are accepted and used by these students. With regard to the view to purify the Chinese language, human concern and tolerance for the coexistence of various discourses are suggested.
文摘At present, there are some resistible illegal operations aiming at creating false public opinions in internet public opinions on emergent event, which seriously disrupted the normal Internet order. However, the traditional research method of internet public opinion pre-waming mainly relies on manual analysis, which is too inefficient to adapt to the analysis of massive internet public opinion information. According to the above analysis, this paper puts forward an internet public opinion pre-warning mechanism on emergent event based on multi-relational data clustering algorithm, discusses the specific pre-waming from the aspects of the state and dissemination of internet public opinions and the historical data, and automatically classifies the internet public opinions through multi-relational data clustering algorithm. And the results show that such method can be used to effectively study the internet public opinion pre-waming on emergent event, with the accuracy rate of as high as 95%.
