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Modeling Arctic Boundary Layer Cloud Streets at Grey-zone resolutions

Advances in Atmospheric Sciences 2020年第1期37卷 42-56页

作者： Hui-Wen LAI Fuqing ZHANG Eugene E.CLOTHIAUX david r.stauffer Brian J.GAUDET Johannes VErLINDE Deliang CHEN Department of Meteorology and Atmospheric Science and Center for Advanced Data Assimilation and Predictability TechniquesThe Pennsylvania State UniversityUniversity ParkPennsylvania 16802USA Department of Earth Sciences University of GothenburgGothenburg 40530Sweden Earth Systems Analysis and Modeling Pacific Northwest National LaboratoryRichlandWashington 99354USA

To better understand how model resolution affects the formation of Arctic boundary layer clouds,we investigated the influence of grid spacing on simulating cloud streets that occurred near Utqiaġvik(formerly Barrow),Alaska,on 2 May 2013 and were observed by MODIS(the Moderate resolution Imaging Spectroradiometer).The Weather research and Forecasting model was used to simulate the clouds using nested domains with increasingly fine resolution ranging from a horizontal grid spacing of 27 km in the boundary-layer-parameterized mesoscale domain to a grid spacing of 0.111 km in the large-eddy-permitting *** investigated the model-simulated mesoscale environment,horizontal and vertical cloud structures,boundary layer stability,and cloud properties,all of which were subsequently used to interpret the observed roll-cloud *** model resolution led to a transition from a more buoyant boundary layer to a more shear-driven turbulent boundary *** clouds were stratiform-like in the mesoscale domain,but as the model resolution increased,roll-like structures,aligned along the wind field,appeared with ever smaller wavelengths.A stronger vertical water vapor gradient occurred above the cloud layers with decreasing grid *** fixed model grid spacing at 0.333 km,changing the model configuration from a boundary layer parameterization to a large-eddy-permitting scheme produced a more shear-driven and less unstable environment,a stronger vertical water vapor gradient below the cloud layers,and the wavelengths of the rolls decreased *** this study,only the large-eddy-permitting simulation with gird spacing of 0.111 km was sufficient to model the observed roll clouds.

关键词： cloud streets large eddy simulation grey zone Arctic clouds model resolution

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Hydromechanical characterization of gas transport amidst uncertainty for underground nuclear explosion detection

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Journal of rock Mechanics and Geotechnical Engineering 2024年第6期16卷 2019-2032页

作者： Wenfeng Li Chelsea W.Neil J William Carey Meng Meng Luke P.Frash Philip H.stauffer Earth and Environmental Sciences Los Alamos National LaboratoryLos AlamosNM87544USA Department of Mineral Engineering New Mexico TechSocorroNM87801USA

Given the challenge of definitively discriminating between chemical and nuclear explosions using seismic methods alone,surface detection of signature noble gas radioisotopes is considered a positive identification of underground nuclear explosions(UNEs).However,the migration of signature radionuclide gases between the nuclear cavity and surface is not well understood because complex processes are involved,including the generation of complex fracture networks,reactivation of natural fractures and faults,and thermo-hydro-mechanical-chemical(THMC)coupling of radionuclide gas transport in the *** this study,we provide an experimental investigation of hydro-mechanical(HM)coupling among gas flow,stress states,rock deformation,and rock damage using a unique multi-physics triaxial direct shear rock testing *** testing system also features redundant gas pressure and flow rate measurements,well suited for parameter uncertainty *** porous tuff and tight granite samples that are relevant to historic UNE tests,we measured the Biot effective stress coefficient,rock matrix gas permeability,and fracture gas permeability at a range of pore pressure and stress *** Biot effective stress coefficient varies from 0.69 to 1 for the tuff,whose porosity averages 35.3%±0.7%,while this coefficient varies from 0.51 to 0.78 for the tight granite(porosityrhaps an underestimate).Matrix gas permeability is strongly correlated to effective stress for the granite,but not for the porous *** experiments reveal the following key engineering implications on transport of radionuclide gases post a UNE event:(1)The porous tuff shows apparent fracture dilation or compression upon stress changes,which does not necessarily change the gas permeability;(2)The granite fracture permeability shows strong stress sensitivity and is positively related to shear displacement;and(3)Hydromechanical coupling among stress states,rock damage,and gas flow appears to be

关键词： Underground nuclear explosion uncertainty quantification radionuclide transport Biot effective stress coefficient Fracture permeability Matrix permeability

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A comparison of laparoscopic to open pancreaticoduodenectomy for pancreatic adenocarcinoma by propensity score matching analysis

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Laparoscopic, Endoscopic, and robotic Surgery 2024年第4期7卷 141-146页

作者： Mount J. Mount B. Poruk K. Tice M. stauffer J.A. Department of Surgery Mayo Clinic Jacksonville FL United States Medical Education Heritage College of Osteopathic Medicine Ohio University Athens OH United States Medical Education The University of Toledo College of Medicine and Life Sciences Toledo OH United States

Objective: In previous studies, laparoscopic pancreaticoduodenectomy (LPD) has demonstrated safety and potential benefits over open pancreaticoduodenectomy (OPD) for pancreatic adenocarcinoma (PDAC). After performing both LPD and OPD procedures interchangeably in routine practice for a decade, the outcomes of LPD versus OPD for PDAC were analyzed and compared at a single institution. Our primary aim was to compare features of LPD and OPD in PDAC patients so that the suitable surgical approach may be chosen for each individual. Methods: From January 2010 through December 2020, all patients undergoing pancreaticoduodenectomy (PD) were identified, and information was collected prospectively. At a single institution, PD was performed on 589 patients, of whom 347 were OPD patients and 242 were LPD patients. After excluding those who underwent pancreatectomy for indications other than PDAC, total pancreatectomy, major vascular or concomitant organ resection, there were 237 patients (OPD = 157, LPD = 80). Then propensity score matching was completed to analyze 77 OPD patients versus 77 LPD patients to create a similar group of patients who underwent either LPD or OPD for PDAC. A comparison of perioperative data and 90-day outcomes with subsequent statistical analysis was performed. results: Operative time (491 min vs. 281 min, p r for LPD than OPD. The rates of pancreatic fistula (11.7% vs. 0.0%, p ric emptying (15.6% vs. 3.9%, p = 0.027) were higher for LPD than OPD respectively but overall morbidity was similar. Blood loss, mortality and post-pancreatectomy hemorrhage were also similar for both groups, but total costs ($60,245 vs. $50,900, p = 0.002) were significantly higher for LPD than OPD. recurrence and overall survival were similar for the two groups. Conclusion: In our experience, LPD does not offer any advantages over OPD for PDAC and is associated with a higher rate of complications and costs. © 2024 Zhejiang University

关键词： Laparoscopy Pancreatic ductal adenocarcinoma Pancreatic fistula Pancreaticoduodenectomy Whipple

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Birth,Survival and Death of Languages by Monte Carlo Simulation

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Communications in Computational Physics 2008年第2期3卷 271-294页

作者： C.Schulze D.stauffer S.Wichmann Institute for Theoretical Physics Cologne UniversityD-50923 KolnEuroland Department of Linguistics Max Planck Institute for Evolutionary AnthropologyDeutscher Platz 6D-04103 LeipzigGermany.

Simulations mostly by physicists of the competition between adult languagessince 2003 are reviewed. The Viviane and Schulze models give good and reasonableagreement, respectively, with the empirical histogram of language sizes. Alsothe numbers of different languages within one language family is modeled reasonablyin an intermediate range. Bilingualism is now incorporated into the Schulze *** the rate at which the majority shifts from one language to another is found tobe nearly independent of the population size, or to depend strongly on it, accordingto details of the Schulze model. Other simulations, like Nettle-Culicover-Nowak, arereviewed more briefly.

关键词： Language competition Schulze model Viviane model agent-based modeling.

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Hobbes's kingdom of light

Hobbes's kingdom of light

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作者： Devin stauffer.

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MULTIPLE-LEVEL INJUrIES OF THE CErVICAL SPINE

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中山大学学报(医学科学版) 1992年第1期13卷 6-14页

作者：刘尚礼,E. Shannon stauffer,richard Lutz Division of Orthopaedics and rehabilitation School of Medicine University of Southern Illinois Division of Orthopaedics and rehabilitation School of Medicine University of Southern Illinois Division of Orthopaedics and rehabilitation School of Medicine University of Southern Illinois

A series of368 cases of cervical spine injuries were collected from theSection of Orthopaedics and rehabilitation,School of Medicine,SIU and studied to definethe so-called multiple level injuries and determine the clinical patterns for the benefitof diagnosis and treatment and evaluation of surgical *** the368 cases,3o casesbelonged to multiple level injuies of the cervical spine,which were divided into threegroups:(1)cervical spine fracture associated with a thoracic or lumbar spinal fracture(12 cases),(2)non-contiguous fractures in the cervical spine(10 cases)and(3)morethan two-leVeI contiguous injuries of the CerviCa1 spine(8 cases).The mechanism of In-juries and possible results of treatment were also discussed.

关键词： multiple-level fracture cervical spine

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Feasibility of pancreatectomy following high-dose proton therapy for unresectable pancreatic cancer

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World Journal of Gastrointestinal Surgery 2017年第4期9卷 103-108页

作者： Kathryn E Hitchcock r Charles Nichols Christopher G Morris Debashish Bose Steven J Hughes John A stauffer Scott A Celinski Elizabeth A Johnson robert A Zaiden Nancy P Mendenhall Michael S rutenberg Department of radiation Oncology University of Florida Department of Surgical Oncology UF Health Cancer Center-Orlando Health Department of Surgery University of Florida Department of Surgery Mayo Clinic Department of Surgery Baylor University Medical Center at Dallas Department of Hematology/Oncology Mayo Clinic Department of Hematology/Oncology Baptist Health

AIM To review surgical outcomes for patients undergoing pancreatectomy after proton therapy with concomitant capecitabine for initially unresectable pancreatic *** From April 2010 to September 2013,15 patients with initially unresectable pancreatic cancer were treated withproton therapy with concomitant capecitabine at 1000 mg orally twice daily. All patients received 59.40 Gy(rBE) to the gross disease and 1 patient received 50.40 Gy(rBE) to high-risk nodal targets. There were no treatment interruptions and no chemotherapy dose reductions. Six patients achieved a radiographic response sufficient to justify surgical exploration,of whom 1 was identified as having intraperitoneal dissemination at the time of surgery and the planned pancreatectomy was aborted. Five patients underwent resection. Procedures included:Laparoscopic standard pancreaticoduodenectomy(n = 3),open pyloris-sparing pancreaticoduodenectomy(n = 1),and open distal pancreatectomy with irreversible electroporation(IrE) of a pancreatic head mass(n = 1). rESULTS The median patient age was 60 years(range,51-67). The median duration of surgery was 419 min(range,290-484),with a median estimated blood loss of 850 cm^3(range,300-2000),median ICU stay of 1 d(range,0-2),and median hospital stay of 10 d(range,5-14). Three patients were re-admitted to a hospital within 30 d after discharge for wound infection(n = 1),delayed gastric emptying(n = 1),and ischemic gastritis(n = 1). Two patients underwent r0 resections and demonstrated minimal residual disease in the final pathology specimen. One patient,after negative pancreatic head biopsies,underwent IrE followed by distal pancreatectomy with no tumor seen in the specimen. Two patients underwent r2 resections. Only 1 patient demonstrated ultimate local progression at the primary site. Median survival for the 5 resected patients was 24 mo(range,10-30).CONCLUSION Pancreatic resection for patients with initially unresectable cancers is feasible after

关键词： Pancreatic cancer Pancreatectomy Pancreas Proton therapy radiotherapy

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你的标杆比对是否运行正轨?

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经理人 2005年第6期 54-57页

作者： david stauffer 连青松居住于蒙大拿州的商务作家

在标杆比对中，背景主宰一切。

关键词：标杆比对数据运营绩效经营机制增值收益企业体制管理模式

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提高个人效率的12个妙招

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经理人 2005年第1期 66-68页

作者： david stauffer 连青松

当你对时间和精力有更大需求时。

关键词：职业经理人生活方式人际关系时间利用效率心理状态领导力

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好数据何以导致坏决定

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经理人 2006年第3期 68-70页

作者： david stauffer 冯玉东

1994年总部在芝加哥的超级食品制造商桂格燕麦公司（Quaker Oats）对思拿多饮料公司（Snapple）的收购在当时看来是一件毋庸置疑的事。首席执行官威尔史密斯伯格（Will Srnithburg）曾于1983年在行业分析家们的一片疑虑声中成功策划了... 详细信息

1994年总部在芝加哥的超级食品制造商桂格燕麦公司（Quaker Oats）对思拿多饮料公司（Snapple）的收购在当时看来是一件毋庸置疑的事。首席执行官威尔史密斯伯格（Will Srnithburg）曾于1983年在行业分析家们的一片疑虑声中成功策划了桂格对一路下挫的佳得乐运动饮料公司（Gatorade）的惊人收购。有了身后佳得乐的成功一他以2．2亿美元的价格收购该公司，后来发展到价值30亿美元——他似乎具有发现收购台适对象的天赋。因此桂格董事会对他收购思拿多的计划放行了。

关键词：饮料公司首席执行官行业分析收购制造商芝加哥史密斯董事会成功美元

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