|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | Experimental and numerical study of the fragmentation of expanding warhead casings by using different numerical codes and solution techniques显示文摘There has been increasing interest in numerical simulations of fragmentation of expanding warheads in 3D.Accordingly there is a pressure on developers of leading commercial codes,such as LS-DYNA.AUTODYN and IMPETUS Afea.to implement the reliable fracture models and the efficient solution techniques.The applicability of the Johnson—Cook strength and fracture model is evaluated by comparing the fracture behaviour of an expanding steel casing of a warhead with experiments.The numerical codes and different numerical solution techniques,such as Eulerian,Lagrangian.Smooth particle hydrodynamics(SPH).and the corpuscular models recently implemented in IMPETUS Afea are compared.For the same solution techniques and material models we find that the codes give similar results.The SPH technique and the corpuscular technique are superior to the Eulerian technique and the Lagrangian technique(with erosion) when it is applied to materials that have fluid like behaviour such as the explosive and the tracer.The Eulerian technique gives much larger calculation time and both the Lagrangian and Eulerian techniques seem to give less agreement with our measurements.To more correctly simulate the fracture behaviours of the expanding steel casing,we applied that ductility decreases with strain rate.The phenomena may be explained by the realization of adiabatic shear bands.An implemented node splitting algorithm in IMPETUS Afea seems very promising. | John F.MOXNES Anne K.PRYTZ Фyvind FRФYLAND Siri KLOKKEHAUG Stian SKRIUDALEN Eva FRIIS Jan A.TELAND Cato DФRUM Gard ФDEGARDSTUEN | 2014 | Defence Technology(防务技术)2014，10，2： | 12 |
| 2 | The coupling of dynamics and permeability in the hydrocarbon accumulation period controls the oil-bearing potential of low permeability reservoirs:a case study of the low permeability turbidite reservoirs in the middle part of the third member of Shahejie显示文摘The relationships between permeability and dynamics in hydrocarbon accumulation determine oilbearing potential(the potential oil charge) of low permeability reservoirs.The evolution of porosity and permeability of low permeability turbidite reservoirs of the middle part of the third member of the Shahejie Formation in the Dongying Sag has been investigated by detailed core descriptions,thin section analyses,fluid inclusion analyses,carbon and oxygen isotope analyses,mercury injection,porosity and permeability testing,and basin modeling.The cutoff values for the permeability of the reservoirs in the accumulation period were calculated after detailing the accumulation dynamics and reservoir pore structures,then the distribution pattern of the oil-bearing potential of reservoirs controlled by the matching relationship between dynamics and permeability during the accumulation period were summarized.On the basis of the observed diagenetic features and with regard to the paragenetic sequences,the reservoirs can be subdivided into four types of diagenetic fades.The reservoirs experienced two periods of hydrocarbon accumulation.In the early accumulation period,the reservoirs except for diagenetic fades A had middle to high permeability ranging from 10 × 10^(-3) μm^2 to4207 × 10^(-3) μm^2.In the later accumulation period,the reservoirs except for diagenetic fades C had low permeability ranging from 0.015 × 10^(-3)~ μm^2 to 62 × 10^(-3) μm^2.In the early accumulation period,the fluid pressure increased by the hydrocarbon generation was 1.4-11.3 MPa with an average value of 5.1 MPa.and a surplus pressure of1.8-12.6 MPa with an average value of 6.3 MPa.In the later accumulation period,the fluid pressure increased by the hydrocarbon generation process was 0.7-12.7 MPa with an average value of 5.36 MPa and a surplus pressure of1.3-16.2 MPa with an average value of 6.5 MPa.Even though different types of reservoirs exist,all can form hydrocarbon accumulations in the early accumulation period.Such types of reservoirs can form hydrocarbon accumulation with high accumulation dynamics:however,reservoirs with diagenetic facies A and diagenetic fades B do not develop accumulation conditions with low accumulation dynamics in the late accumulation period for very low permeability.At more than 3000 m burial depth,a larger proportion of turbidite reservoirs are oil charged due to the proximity to the source rock.Also at these depths,lenticular sand bodies can accumulate hydrocarbons.At shallower depths,only the reservoirs with oil-source fault development can accumulate hydrocarbons.For flat surfaces,hydrocarbons have always been accumulated in the reservoirs around the oil-source faults and areas near the center of subsags with high accumulation dynamics. | Tian Yang Ying-Chang Cao Yan-Zhong Wang Henrik Friis Beyene Girma Haile Ke-Lai Xi Hui-Na Zhang | 2016 | Petroleum Science2016，13，2： | 10 |
| 3 | On the study of ricochet and penetration in sand,water and gelatin by spheres,7.62 mm APM2,and 25 mm projectiles显示文摘We examine the ricochet and penetration behavior in sand, water and gelatin by steel spheres, 7.62 mm APM2 and 25 mm projectiles. A threshold impact angle(critical angle) exists beyond which ricochet cannot occur. The Autodyn simulation code with the smooth particle hydrodynamic(SPH) method and Impetus Afea Solver with the corpuscular model are used and the results are compared with experimental and analytical results. The resistance force in sand for spheres was proportional to a term quadratic in velocity plus a term linear in velocity. The drag coefficient for the quadratic term was 0.65. The Autodyn and Impetus Afea codes simulate too large penetration due to the lack of a linear velocity resistance force. Critical ricochet angles were consistent with analytical results in the literature. In ballistic gelatin at velocities of 50–850 m/s a drag coefficient of 0.30 fits the high speed camera recordings if a linear velocity resistance term is included. However, only a quadratic velocity resistance force with drag coefficient that varies with the Reynolds number also fits the measurements. The simulation of a sphere in water with Autodyn showed too large drag coefficient. The 7.62 mm APM2 core simulations in sand fit reasonable well for both codes. The 25 mm projectile ricochet simulations in sand show consistency with the high speed camera recordings. Computer time was reduced by one to two orders of magnitudes when applying the Impetus Afea Solver compared to Autodyn code due to the use of the graphics processing units(GPU). | John F.MOXNES ∅yvind FR∅YLAND Stian SKRIUDALEN Anne K.PRYTZ Jan A.TELAND Eva FRIIS Gard ∅DEGARDSTUEN | 2016 | Defence Technology(防务技术)2016，12，2： | 6 |
| 4 | 中国—中新世湖泊的古生态:根据山旺盆地植硅体的初步解释显示文摘山东山旺中新世山旺组湖相沉积中富含保存精美的古生物化石。对于湖相沉积中的昆虫、植物和哺乳动物化石,前人已经做了大量的研究工作。其中植物大化石和孢粉的研究结果表明,中新世山旺组在沉积期间,山旺湖周围的植被处于湿润的暖温带到亚热带的古生态环境下。哺乳动物蝙蝠和貘化石的研究结果也支持这个结论。然而,迄今为止,还没有关于草本植物的种类组成及含量的研究报道。本文首次对山旺组样品中的植硅体进行了研究,为山旺中新世植被的研究提供了新的证据。对从6块山旺组样品中分析出的植硅体进行研究的结果表明,山旺中新世植硅体组合含有丰富的保存极好的草本植物植硅体,代表森林成分的双子叶植物植硅体,以及偶尔出现的棕榈科植硅体。草本植物的植硅体主要来自于C_3/C_4禾本科的PACCAD类群和早熟禾亚科的植物,少数可能来自于在林下封闭生活环境中生长的草本植物。山旺中新世植硅体组合显示,在湖边森林生活环境下,伴生大量的适合沼生到中生环境的草本植物,在较干旱的地区生长着早熟禾(和PACCAD)的草本植物。本文的研究结果进一步支持山旺中新世气候比现在更加湿润而且变动较小的观点。山旺中新世植硅体组合与土耳其和北美大平原中新世湖相沉积中的植硅体组合不同,后者的植硅体组合主要是由多种C_3早熟禾亚科草本和不同种类的PACCAD类群草本植物组成。今后的研究工作将进一步揭示这种差异是否反映了草本植物群落在大尺度的生物地理上的差异,或者是由于地区性的局部气候不同所导致。 | Caroline A.E.STRoMBERG Else Marie FRIIS 梁明媚 Lars WERDELIN 张玉亮 | 2007 | 古脊椎动物学报2007，45，2： | 6 |
| 5 | New tight junction protein 2 variant causing progressive familial intrahepatic cholestasis type 4 in adults: A case report显示文摘BACKGROUND Progressive familial intrahepatic cholestasis(PFIC)encompasses a group of autosomal recessive disorders with high morbidity and mortality.Variants in the gene encoding tight junction protein-2(TJP2)have been linked to PFIC type 4(PFIC4),which predominantly presents in childhood.However,there are only limited data from adults with TJP2-related PFIC4.We report a family with an autosomal recessive disorder with a novel variant in the TJP2 gene in adults with very variable expression of PFIC4.CASE SUMMARY The index patient presented at 19 years old with liver cirrhosis and variceal bleeding and was treated with endoscopic banding and beta-blockers.In 2018,he developed primary liver cancer that was treated with radiofrequency ablation followed by liver transplantation in 2019.Genetic testing revealed a novel homozygous TJP2 variant causing PFIC4(TJP2([NM_004817.3]:c.[3334C>T];[3334C>T])).The consanguineous family consists of the father and mother(both heterozygous)and their 12 children,of which five carry the variant in a homozygous state;however,these five siblings have highly variable expression of PFIC4.Two homozygous brothers had cirrhosis and portal hypertension at diagnosis at the ages of 19 and 36.Two other homozygous brothers,age 23 and 19,and the homozygous sister,age 21,have elevated liver enzymes but presently no cirrhosis,which may suggest an age-dependent penetrance.In addition,five sisters had severe and mild intrahepatic cholestasis of pregnancy and carry the TJP2 variant in a homozygous and heterozygous state,respectively.CONCLUSION This novel TJP2 variant is associated with PFIC4 causing severe liver disease with cirrhosis and primary liver cancer in adolescents/adults. | Chun-Shan Wei Naja Becher Jenny Blechingberg Friis Peter Ott Ida Vogel Henning Grønbæk | 2020 | World Journal of Gastroenterology2020，26，5： | 6 |
| 6 | Impact of the gut microbiota on rodent models of human disease显示文摘Traditionally bacteria have been considered as either pathogens,commensals or symbionts.The mammal gut harbors 1014 organisms dispersed on approximately1000 different species.Today,diagnostics,in contrast to previous cultivation techniques,allow the identification of close to 100%of bacterial species.This has revealed that a range of animal models within different research areas,such as diabetes,obesity,cancer,allergy,behavior and colitis,are affected by their gut microbiota.Correlation studies may for some diseases show correlation between gut microbiota composition and disease parameters higher than 70%.Some disease phenotypes may be transferred when recolonizing germ free mice.The mechanistic aspects are not clear,but some examples on how gut bacteria stimulate receptors,metabolism,and immune responses are discussed.A more deeper understanding of the impact of microbiota has its origin in the overall composition of the microbiota and in some newly recognized species,such as Akkermansia muciniphila,Segmented filamentous bacteria and Faecalibacterium prausnitzii,which seem to have an impact on more or less severe disease in specific models.Thus,the impact of the microbiota on animal models is of a magnitude that cannot be ignored in future research.Therefore,either models with specific microbiota must be developed,or the microbiota must be characterized in individual studies and incorporated into data evaluation. | Axel Kornerup Hansen Camilla Hartmann Friis Hansen Lukasz Krych Dennis Sandris Nielsen | 2014 | World Journal of Gastroenterology2014，20，47： | 4 |
| 7 | Projected area and drag coefficient of high velocity irregular fragments that rotate or tumble显示文摘3 degrees of freedom(DOF)exterior ballistic computer models are used in fragment studies to calculate individual trajectories of each fragment based on drag coefficient and the projected(presented)area in the direction of velocity of center of mass.The expectation of a randomly distributed projected area is commonly used for fragments that tumble(random rotation)during flight.We forecast a model where the expected drag coefficient is dependent of shape and Mach number.Rotation or tumbling only affects the expected projected area.Models of projected areas during tumbling and rotation are presented.An examination of the data by Mc Cleskey(1988)indicates that the volume of the fragment to the power of2/3 is a better parameter to characterize the drag coefficient of the fragments than the maximum projected area.Hydrocode simulations are used to verify results and to study projected area and drag coefficient of fragments. | John F. Moxnes 0yvind Fr0 yland Ivar J. 0ye Tom I. Brate Eva Friis Gard 0degardstuen Tallak H. Risdal | 2017 | Defence Technology(防务技术)2017，13，4： | 3 |
| 8 | The role of endoscopy in the management of obscure GI bleeding显示文摘 | Laurel Fisher Mary Lee Krinsky Michelle A. Anderson Vasundhara Appalaneni Subhas Banerjee Tamir Ben-Menachem Brooks D. Cash G. Anton Decker Robert D. Fanelli Cindy Friis Norio Fukami M. Edwyn Harrison Steven O. Ikenberry Rajeev Jain Terry Jue Khalid Khan | 2010 | Gastrointestinal Endoscopy2010，，3： | 2 |
| 9 | Campylobacter jejuni drives MYD88- independent IL45 secretion via TLR-2 显示文摘 | Friis LM Keelan M Taylor DE | 2009 | Infect hnmun2009，77，4： | 1 |
| 10 | Development of early diagenetic silica and quartz morphologies: Examples from the Siri Canyon, Danish North Sea显示文摘 | Weibel R Friis H Kazerouni A M | 2010 | Sedimentary Geology2010，228，34： | 1 |
| 11 | Statin use and risk of prostate cancer:a Danish population-based case-control study, 1997-2010显示文摘 | Jespersen CG Norgaard M Friis S | 2014 | Cancer Epidemiol2014，38，1： | 1 |
| 12 | Economic Incentives for Sustainable Management:a Small Optimal Control Model for Tropical Forestry显示文摘 | Christian Friis Bach | | 0，，： | 1 |
| 13 | The use of enzyme-linke immunosorbent assay for detection of Mycoplasma hominis antibodies in infertile women serum samples显示文摘 | Baczynska A Friis Svenstrup H Fedder J | | 0，，05： | 1 |
| 14 | Smoking is a risk factor for recurrence of groin hernia显示文摘 | Friis E Jorgensen T | 2002 | World J Surg2002，26，4： | 1 |
| 15 | Is boar taint related to sex differences or polymorphismof skatole metabolism Proceedings of a meeting of the EAAPworking group Production and utilisation of meat from entiremale pigs显示文摘 | Friis C | 1995 | Milton Keynes1995，，9： | 1 |
| 16 | Mycoplasma hyorhinis isolation from cases of otitis media in piglets 显示文摘 | Friis N F Kokotovic B Svensmark B | 2002 | Acta Vet Stand2002，43，3： | 1 |
| 17 | The influence of surface microroughness and hydrophilicity of titanium on the up - regulation of TGF/BMP signalling in osteoblasts 显示文摘 | Vlacic - Zischke J Hamlet SM Friis T | 2011 | Biomateri- als2011，32，3： | 1 |
| 18 | Cancer risk among Danish women with cosmetic breast implants显示文摘 | Friis S Holmich LR McLaughlin JK | 2006 | Int J Cancer2006，118，4： | 1 |
| 19 | Cancer risk among Danish women with cosmetic breast implants 显示文摘 | Friis S Holmich LR McLaughlin JK | 2006 | Int J Cancer2006，118，4： | 1 |
| 20 | Alkaline single cell gel electrophoresis and human biomonitoring for genotoxicity: a study on subjects with residential exposure to radon 显示文摘 | HELLMAN B FRIIS L VAGHEF H | 1999 | Muta Res1999，442，2： | 1 |
您所在的机构暂未开通此部分的功能，请联系管理员