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Computed tomography (CT) of nasal cavity of Ikechosaurus sunailinae (Reptilia: Choristodera)

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Chinese Science Bulletin 1999年第24期44卷 2277-2281页

作者： Junchang lü Qizhi Zhu Xikan Cheng Xiangke Du Chinese Acad Sci Inst Vertebrate Paleontol & Paleoanthropol Beijing 100044 Peoples R China Beijing Med Univ Renmin Hosp Dept Radiol Treatment Beijing 100044 Peoples R China

The CT technique was first applied to observing the nasal cavity of Ikechosaurus sunailinae. The results indicate that the nasal cavity is very complex, and it was divided into two parts: the posterior-upper part and ... 详细信息

关键词： CT scan thermoregulation nasal cavity Ikechosaurus.

Efficient strategies for leave-one-out cross validation for genomic best linear unbiased prediction

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Journal of Animal Science and Biotechnology 2017年第3期8卷 733-737页

作者： Hao Cheng Dorian J.Garrick Rohan l.Fernando Department of Animal Science Iowa State University50011AmesIowaUSA Department of Statistics Iowa State University50011AmesIowaUSA Institute of Veterinary Animal&Biomedical ScienceMassey UniversityPalmerston NorthNew Zealand

Background： A random multiple-regression model that simultaneously fit all allele substitution effects for additive markers or haplotypes as uncorrelated random effects was proposed for Best linear Unbiased Prediction, using whole-genome data. leave-one-out cross validation can be used to quantify the predictive ability of a statistical ***： Naive application of leave-one-out cross validation is computationally intensive because the training and validation analyses need to be repeated n times, once for each observation. Efficient leave-one-out cross validation strategies are presented here, requiring little more effort than a single ***： Efficient leave-one-out cross validation strategies is 786 times faster than the naive application for a simulated dataset with 1,000 observations and 10,000 markers and 99 times faster with 1,000 observations and 100 markers. These efficiencies relative to the naive approach using the same model will increase with increases in the number of ***： Efficient leave-one-out cross validation strategies are presented here, requiring little more effort than a single analysis.

关键词： leave-one-out cross validation GBlUP

Dynamics in large generators due to oval rotor and triangular stator shape

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Acta Mechanica Sinica 2011年第1期27卷 18-27页

作者： Niklas l.P.lundstrm Jan-Olov Aidanp Division of Solid Mechanics Department of Applied Physics and Mechanical EngineeringLuleUniversity of Technology

Earlier measurements in large synchronous generators indicate the existence of complex whirling motion, and also deviations of shape in both the rotor and the stator. These non-symmetric geometries produce an attraction force between the rotor and the stator,called unbalanced magnetic pull（UMP）.The target of this paper is to analyse responses due to certain deviations of shape in the rotor and the *** particular,the perturbation on the rotor is considered to be of oval character,and the perturbations of the stator are considered *** numerical and analytical methods it is concluded for which generator parameters harmful conditions,such as complicated whirling motion and high amplitudes,will *** maintenance of hydro power generators the shapes of the rotor and stator are frequently *** results from this paper can be used to evaluate such measurements and to explain the existence of complex whirling motion.

关键词： Generator · Rotor · Dynamics · Asymmetric · Hydropower

Cardiac mechanostructure: Using mechanics and anisotropy as inspiration for developing epicardial therapies in treating myocardial infarction

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Bioactive Materials 2021年第7期6卷 2198-2220页

作者： Kiera D.Dwyer Kareen l.K.Coulombe Center for Biomedical Engineering School of EngineeringBrown UniversityProvidenceRIUSA

The mechanical environment and anisotropic structure of the heart modulate cardiac function at the cellular,tissue and organ *** myocardial infarction(MI)and subsequent healing,however,this landscape changes *** order to engineer cardiac biomaterials with the appropriate properties to enhance function after MI,the changes in the myocardium induced by MI must be clearly *** this review,we focus on the mechanical and structural properties of the healthy and infarcted myocardium in order to gain insight about the environment in which biomaterial-based cardiac therapies are expected to perform and the functional deficiencies caused by MI that the therapy must *** this understanding,we discuss epicardial therapies for MI inspired by the mechanics and anisotropy of the heart focusing on passive devices,which feature a biomaterials approach,and active devices,which feature robotic and cellular *** this review,a detailed analysis is provided in order to inspire further development and translation of epicardial therapies for MI.

关键词： Anisotropy Cardiac biomechanics Epicardial therapies Ventricular restraint Cardiac tissue engineering

Unique and conserved features of floral evocation in legumes

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Journal of Integrative Plant Biology 2014年第8期56卷 714-728页

作者： lim Chee liew Mohan B. Singh Prem l. Bhalla Plant Molecular Biology and Biotechnology laboratory Melbourne School of Land and Environment University of Melbourne

legumes, with their unique ability to fix atmo- spheric nitrogen, play a vital role in ensuring future food security and mitigating the effects of climate change because they use less fossil energy and produce less greenhouse gases compared with N-fertilized systems. Grain legumes are second only to cereal crops as a source of human and animal food, and they contribute approximately one third of the protein consumed by the human population. The productivityof seed crops, such as grain legumes, is dependent on flowering. Despite the genetic variation and importance of flowering in legume production, studies of the molecular pathways that control flowering in legumes are limited. Recent advances in genomics have revealed that legume flowering pathways are divergent from those of such model species as Arabidopsis thaliana. Here, we discuss the current understanding of flowering time regulation in legumes and highlight the unique and conserved features of floral evocation in legumes.

关键词： Flowering legume soybean

Numerical simulation of effect of rotational tool with screw on material flow behavior of friction stir welding of Ti6Al4V alloy

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Acta Metallurgica Sinica(English letters) 2012年第5期25卷 365-373页

作者： Shude JI Aili ZOU Yumei YUE Guohong l UAN Yanye JIN Fu lI Faculty of Aerospace Engineering Shenyang Aerospace University Shenyang 110136 China Beijing Aeronautical Manufacturing Technology Research Institute Beijing 100024 China

The rotational tool is put forward, which is composed of the one-spiral-flute shoul- der and the rotational pin with screw. Using the turbulent model of the FlUENT software, material plastic flow behavior during the process of friction stir welding of Ti6A14V alloy is researched by the numerical simulation method and then the effect of rotational tool geometry on material flow during the welding process is attained. The results show that the flow direction of the material near the rotational tool is mainly the same as the rotational direction of the tool while the material near tool flows more violently than the other regions. For the tapered rotational pin, the flow velocity of material inside the workpiece decreases with the increase of the distance away from the workpiece surface because of the change of pin diameter. For the rotational tool, the flute added to the shoulder and the screw added to the pin can greatly increase the flow velocity of material during the welding process while the peak value of the flow velocity of material appears on the flute or the screw. Moreover, the rotational tool with the one-spiral-flute shoulder is better than the tool with the concentric- circles-flute shoulder. Decreasing the width of pin screw and increasing the diameter of pin tip are both good for the increase of flow velocity.

关键词： Friction stir welding Titanium alloy Plastic flow Numericalsimulation

Drosophila neuronal injury model allows for temporal dissection of neurodegenerative events

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Neural Regeneration Research 2016年第3期11卷 416-417页

作者： Barron l.lincolnⅡ lani C.Keller Department of Biological Sciences Quinnipiac University

Neurodegenerative diseases are extremely prevalent in today’s society and,according to the World Health Organization,are currently listed as the third leading cause of death,following cancer and heart disease（Gammon,2014）.The seminal characteristic of neuro-muscular degeneration is the complete disruption of the circuit between the brain,peripheral neuron,and muscle,

关键词： neuronal degeneration muscular dissection extremely Drosophila disruption currently listed today

Evaluation of the Mechanisms Acting on the Atlantic Meridional Overturning Circulation in CESM2 for the 1pctCO_(2) Experiment

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Journal of Atmospheric Science Research 2024年第1期7卷 40-58页

作者： lívia Sancho Elisa Passos Marcio Cataldi luiz Paulo de Freitas Assad luiz landau laboratory of Computational Methods in Engineering Civil Engineering ProgramAlberto Luiz Coimbra Institute for Graduate Studies and Research in EngineeringFederal University of Rio de JaneiroRio de Janeiro21941-617Brazil Civil Engineering Program Alberto Luiz Coimbra Institute for Graduate Studies and Engineering ResearchFederal University of Rio de JaneiroRio de Janeiro21941-617Brazil Physical Oceanography laboratory Department of Physical OceanographyFaculty of OceanographyRio de Janeiro State UniversityRio de Janeiro20559-900Brazil Climate System Monitoring and Modeling laboratory Water Resources and Environmental EngineeringFluminense Federal University24020-140Brazil Regional Atmospheric Modeling Group(MAR) Physics of the EarthDepartment of PhysicsRegional Campus of International Excellence(CEIR)“Campus Mare Nostrum”University of MurciaMurcia30100Spain Department of Meteorology Institute of GeosciencesFederal University of Rio de JaneiroRio de Janeiro21941-617Brazil

The Atlantic Meridional Overturning Circulation(AMOC)is a crucial component of the Earth’s climate system due to its fundamental role in heat distribution,carbon and oxygen transport,and the *** climate components,such as the atmosphere and sea ice,influence the *** the physical mechanisms of those interactions is paramount to increasing knowledge about AMOC’s *** this study,the authors used outputs from the Community Earth System Model version 2 and observational data to investigate changes in theAMOC and the associated physical *** DECK experiments were evaluated:piControl and 1pctCO_(2),with an annual increase of 1%of atmospheric CO_(2).The analysis revealed a significant decrease in the AMOC,associated with changes in mixed layer depth and buoyancy in high latitudes of the North Atlantic,resulting in the shutdown of deep convection and potentially affecting the formation of North Atlantic Deep Water and Antarctic Bottom Water.A vital aspect observed in this study is the association between increased runoff and reduced water evaporation,giving rise to a positive feedback ***,the rates of freshwater spreading have intensified during this period,which could lead to an accelerated disruption of the AMOC beyond the projections of existing models.

关键词： AMOC Meridional cell Climate change Deep circulation CESM2 results CMIP6

Primary biliary cholangitis:Diagnosis and treatment

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liver Research 2018年第2期2卷 81-86页

作者： Michael Chew Christopher l.Bowlus Department of Internal Medicine University of California Davis School of MedicineCAUSA Division of Gastroenterology and Hepatology University of California Davis School of MedicineCAUSA

Primary biliary cholangitis(PBC)is an autoimmune disease that causes progressive destruction of the intrahepatic bile *** the pathogenesis of PBC is not completely understood,it is characterized by cholestatic inflammation resulting in a spectrum of cholangitis,varying degrees of fibrosis,and,potentially,*** affects all races;however,there have been few clinical studies of the disease in Asian countries,particularly in Southeast Asia,suggesting that PBC may be underreported in the Asian ***,we review the epidemiology,natural history,predictive and diagnostic features,and current and emerging treatments for *** goal is also to highlight current studies from Asian countries to provide a better understanding of PBC in this patient population.

关键词： Primary biliary cholangitis(PBC) Epidemiology Natural history Diagnosis Treatment