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799篇 您的检索式:作者名="Ord"
    题名 作者 年代 出处 被引量
1European evidence based consensus for endoscopy in inflammatory bowel disease显示文摘Vito Annese Marco Daperno Matthew D. Rutter Aurelien Amiot Peter Bossuyt James East Marc Ferrante Martin G?tz Konstantinos H. Katsanos Ralf Kie?lich Ingrid Ordás Alessandro Repici Bruno Rosa Shaji Sebastian Torsten Kucharzik Rami Eliakim 2013Journal of Crohn’s and Colitis2013,,12:7
2A new alternative approach for investigating acidization dissolution front propagation in fluid-saturated carbonate rocks显示文摘The natural phenomenon associated with the chemical dissolution of dissolvable minerals of rocks can be employed to develop innovative technology in mining and oil extracting engineering.This paper presents a new alternative approach for theoretically dealing with chemical dissolution front(CDF) propagation in fluid-saturated carbonate rocks.Note that the CDF is represented by the porosity front in this study.In this new approach,the porosity,pore-fluid velocity and acid concentration are directly used as independent variables.To illustrate how to use the present new approach,an acidization dissolution system(ADS) consisting of carbonate rocks,which belongs to one of the many general chemical dissolution systems(CDSs),is taken as an application example.When the acid dissolution capacity(ADC) number(that is defined as the ratio of the volume of the carbonate rock dissolved by an acid to that of the acid) approaches zero,the present new approach can be used to obtain analytical solutions for the stable ADS.However,if the ADC number is a nonzero finite number,then numerical solutions can be only obtained for the ADS,especially when the ADS is in an unstable state.The related theoretical results have demonstrated that:(1) When the ADS is in a stable state and in the case of the ADC number approaching zero,the present new approach is mathematically equivalent to the previous approach,in which the porosity,pore-fluid pressure and acid concentration are used as independent variables.However,when the ADS is in an unstable state,the use of the present new approach leads to a free parameter that needs to be determined by some other ways.(2) The existence of a non-step-type dissolution front within a transient region should at least satisfy that none of the ADC number,injected acid velocity and reciprocal of the dissolution reaction rate is equal to zero in the stable ADS.ZHAO ChongBin HOBBS Bruce ORD Alison 2017Science China(Technological Sciences)2017,60,8:6
3Ulcerative colitis显示文摘Ingrid Ordás Lars Eckmann Mark Talamini Daniel C Baumgart William J Sandborn 2012The Lancet2012,,9853:5
4Effective loading algorithm associated with explicit dynamic relaxation method for simulating static problems显示文摘Based on the fact that a static problem has an equivalent wave speed of infinity and a dynamic problem has a wave speed of finite value, an effective loading algorithm associated with the explicit dynamic relaxation method was presented to produce meaningful numerical solutions for static problems. The central part of the explicit dynamic relaxation method is to turn a time-independent static problem into an artificial time-dependent dynamic problem. The related numerical testing results demonstrate that: (1) the proposed effective loading algorithm is capable of enabling an applied load in a static problem to be propagated throughout the whole system within a given loading increment, so that the time-independent solution of the static problem can be obtained; (2) the proposed effective loading algorithm can be straightforwardly applied to the particle simulation method for solving a wide range of static problems.赵崇斌 彭省临 刘亮明 HOBBS B E ORD A 2009Journal of Central South University2009,16,1:4
5Are we giving biologics too late? The case for early versus late use显示文摘Corticosteroids and immunomodulators have been the mainstay therapies for Crohn’s disease. Corticosteroids are highly effective to control symptoms in the short- term, but they are not effective in maintaining remission, they heal the mucosa in a reduced proportion of cases, and long-time exposure is associated with an increased risk of infections and mortality. Immunomodulators, azathioprine and methotrexate, heal the mucosa in a higher proportion of patients that corticosteroids but their onset of action is slow and they benefit less than half of patients with Crohn’s disease. In the last decade, medical therapy for Crohn’s disease has experienced a remarkable change due to the introduction of biologic therapy, and particularly the use of anti-tumour necrosis factor-alpha agents. Infliximab, adalimumab, and certolizumab pegol have demonstrated efficacy for induction and maintenance of remission in active Crohn’s disease. These agents have raised the bar for what is a suitable symptomatic response in Crohn’s disease and modification of the natural history of the disease has become a major goal in the treatment of Crohn’s disease. There are several data in the literature that suggest that early use of biologic therapy and achievement of mucosal healing contribute to disease course modification. However, many questions on early biological therapy for Crohn’s disease remain still unanswered.Elena Ricart Orlando García-Bosch Ingrid Ordás Julián Panés 2008World Journal of Gastroenterology2008,14,36:4
6Ulcerative colitis显示文摘Ingrid Ordás Lars Eckmann Mark Talamini Daniel C Baumgart William J Sandborn 20122012 (9853)2012,,9853:3
7热液矿床成矿作用研究新途径:数值模拟显示文摘热液矿床是最具有工业价值的矿床类型之一,传统矿床学研究在成岩成矿作用、成矿机制和成矿规律等方面已有丰硕成果.但仍存在一些尚无法有效回答的科学问题。近年来,数值模拟方法逐步应用于热液矿床的研究,已成为成矿过程定量研究的新手段。本文系统总结了近年来热液矿床成矿过程数值模拟研究的成果和进展,并对存在问题和发展趋势进行了分析和展望,以期进一步推动这一交叉学科领域的研究.袁峰 李晓晖 胡训宇 李跃 贾蔡 Ord Alison 张明明 戴文强 李贺 2019地质科学2019,54,3:3
8多年生黑麦草、雀麦根系形态和生长对土壤干旱的适应性显示文摘为了研究牧草根系对干旱环境的适应性,选择多年生黑麦草(Lolium perenne)和雀麦(Bromus valdivianus)进行盆栽试验,给予80%~85%有效水(PAW)充分供水和20%~25%PAW极端干旱两种水分模式,通过对两种牧草的根系外形、干物质积累和根系形态学分析,探求两牧草在极干旱胁迫下的有效生产策略。研究表明,两种牧草的根尖外形略有不同。雀麦根毛长而密,分生区细胞致密,伸长区较长;多年生黑麦草根毛稀疏,伸长区短。20%~25%PAW极干旱胁迫使黑麦草根系粗细不匀,出现畸形;而雀麦根系未见明显受害。两种牧草生物量在茎叶和根的积累无显著的种间差异和水分处理间的组间差异。雀麦和多年生黑麦草单株根系的总长度、根面积、根平均直径、根尖数和分叉数存在极显著差异。多年生黑麦草根量显著高于雀麦(至少P≤0.01),根长和面积是雀麦的1.5倍左右,根尖数和分叉数是雀麦的2倍以上。雀麦根系末端侧根分枝密度高,短且粗;多年生黑麦草侧根细而长。干旱胁迫显著减少了两种牧草的总根长度,促进了雀麦根的径向生长。总之,雀麦根毛区较多年生黑麦草发达,多年生黑麦草根量显著多于雀麦。黑麦草主要以根数量(量)取胜,采取广泛吸水的适应策略;雀麦以根毛发达,侧根分枝密度高(质)为主,采用确保有效吸水的适应策略。张咏梅 胡海英 白小明 Matthew Cory García-Favre Javier Ordóñez Iván P 2022中国生态农业学报(中英文)2022,30,11:3
9不同数值算法对模拟饱水孔隙岩石中化学溶解面非稳定性的影响(英文)显示文摘鉴于求得解析解的困难,需要采用数值方法和算法得到大量科学和工程问题的计算模拟结果。这对求解饱水孔隙岩石中化学溶解面非稳定性问题而言也不例外。由于这类非稳定性问题可具有常规解和非常规解,很有必要探讨不同数值算法对模拟饱水孔隙岩石中化学溶解面非稳定性的影响。因此,本文考虑了与常用有限元相关的2种不同数值算法。在第1种数值算法中,孔隙率、孔隙流体压力和酸液浓度被选为基本变量。在第2种数值算法中,孔隙率、孔隙流体流速和酸液浓度被选为基本变量。相关的计算模拟结果表明:(1)第1种数值算法可真实地模拟非稳定化学溶解面在化学溶解系统中传播时的演化过程;(2)第2种数值算法不能模拟非稳定化学溶解面在化学溶解系统中传播时的演化过程;(3)过度的数学微分运算是导致第2种数值算法失效的主要原因。赵崇斌 Bruce HOBBS Alison ORD 2018Journal of Central South University2018,25,8:3
10A Bibliometric Analysis of Digital Innovation from 1998 to 2016显示文摘Digital technologies are ubiquitous in our everyday lives.They have been widely embedded into the core processes of services and products,as well as into the operations of many organizations.These digital technologies bring many changes to our work and lifestyles,to the organization of companies,and even to the structures of whole industries.Thus,digital innovation is a research hotspot.This study investigates the development of digital innovation research using a bibliometric method with visual mapping.The status of digital innovation research is analyzed through citation analysis.Influential references,authors,and top-tier journals are identified.The literature’s intellectual structure is mapped through co-word analysis.In addition,co-citation network analysis is used to describe the evolution of digital innovation research,and cluster analysis of the main research stream is conducted.Several research topics addressed by recent papers are also discussed.Finally,cross-country comparisons reveal that the US is currently taking the leading role and that China is a newcomer with potential contributions to make in this research area.Xi Zhang Yao Meng Hui Chen Jiang Yu Yongqiang Sun Patricia Ordóñez de Pablos Joy Wei He 2017Journal of Management Science and Engineering2017,2,2:3
11Accuracy of Magnetic Resonance Enterography in Assessing Response to Therapy and Mucosal Healing in Patients With Crohn’s Disease显示文摘Ingrid Ordás Jordi Rimola Sonia Rodríguez José M. Paredes María J. Martínez-Pérez Esther Blanc Juan A. Arévalo Marta Aduna Montserrat Andreu Alexander Radosevic Anna M. Ramírez-Morros Susana Pinó Marta Gallego Aranzazu Jauregui-Amezaga Elena Ricart Julián 2013Gastroenterology2013,,:3
12A unified theory for sharp dissolution front propagation inchemical dissolution of fluid-saturated porous rocks显示文摘This paper presents a unified theory to deal with when, why and how a sharp acidization dissolution front(ADF), which is represented by the porosity distribution curve, can take place in an acidization dissolution system composed of fluid-saturated porous rocks. The theory contains the following main points:(1) A reaction rate of infinity alone can lead to a sharp ADF of the Stefan-type in the acidization dissolution system. This sharp front is unstable when permeability in the downstream region is smaller than that in the upstream region.(2) For a finite reaction rate, when the acid dissolution capacity number approaches zero,the ADF can have a sharp profile of the Stefan-type either on a much smaller time scale or on a much larger time scale than the dissolution time scale. In the former case, the ADF may become unstable on a much larger time scale than the transport time scale, while in the latter case, it may become unstable if the growth rate of a small perturbation is greater than zero.(3) On the dissolution time scale, even if both the reaction rate is finite and the acid dissolution capacity number approaches zero, the profile of an ADF may not be sharp because it is in a transient state. In this case, not only can an ADF change its profile with time, but also its morphology can grow if the growth rate of a small perturbation is greater than zero. Due to the involvement of both the change rate and the growth rate of the ADF profile, it is necessary to conduct a transient linear stability analysis for determining whether or not a time-dependent ADF is stable in the acidization dissolution system.ZHAO ChongBin HOBBS Bruce ORD Alison 2019Science China(Technological Sciences)2019,62,1:3
13Transient-state instability analysis of dissolution-timescale reactive infiltration in fluid-saturated porous rocks: Purely mathematical approach显示文摘This paper deals with how the purely mathematical approach can be used to solve transient-state instability problems of dissolution-timescale reactive infiltration(DTRI) in fluid-saturated porous rocks. Three key steps involved in such an approach are:(1) to mathematically derive an analytical solution(known as the base solution or conventional solution) for a quasi-steady state problem of the dissolution timescale, which is viewed as a frozen state of the original transient-state instability problem;(2)to mathematically deduce a group of first-order perturbation partial-differential equations(PDEs) for the quasi-steady state problem;(3) to mathematically derive an analytical solution(known as the perturbation solution or unconventional solution) for this group of first-order perturbation PDEs. Because of difficulty in mathematically solving a transient-state instability problem of DTRI in general cases, only a special case, in which some nonlinear coupling between governing PDEs of the problem can be decoupled, is considered to illustrate these three key steps in this study. The related theoretical results demonstrated that the transient chemical dissolution front can become unstable in the DTRI system of large Zh numbers when the long wavelength perturbations are applied to the system. This new finding may lay the theoretical foundation for developing innovative technique to exploit shale gas resources in the deep Earth.ZHAO ChongBin HOBBS Bruce ORD Alison 2020Science China(Technological Sciences)2020,63,2:2
14Risk of developing tuberculosis under anti-TNF treatment despite latent infection screening显示文摘Aranzazu Jauregui-Amezaga Fanny Turon Ingrid Ordás Marta Gallego Faust Feu Elena Ricart Julián Panés 2012Journal of Crohn’s and Colitis2012,,:2
15Ulcerative colitis显示文摘Ingrid Ordás Lars Eckmann Mark Talamini Daniel C Baumgart William J Sandborn 2012The Lancet . 2012 (9853)2012,,:2
16Sublingual lymph node metastasis of early tongue cancer: report of two cases and review of the literature显示文摘T. Zhang R.A. Ord W.I. Wei J. Zhao 2011International Journal of Oral & Maxillofacial Surgery2011,,6:2
17Potential mechanisms of pore-fluid movement from continental lithospheric mantle into upper continental crust显示文摘Through integrating the state of the art scientific knowledge in different research fields, some potential mechanisms of large-scale movements of underground pore-fluids such as H2O and CO2 in the continental lithosphere were presented and discussed. The results show that the generation and propagation of porosity waves are important mechanisms to transport mass and heat fluxes from the continental lithospheric mantle into the lower continental crust; the generation and propagation of porosity waves, pore-fluid flow focusing through lower and middle crustal faults, advection of pore-fluids through the lower and middle crust, and whole-crust convection in some particular cases are important mechanisms to transport mass and heat fluxes from the lower into the upper continental crust; heat and mass transport through convective pore-fluid flow is the most effective mechanism of ore body formation and mineralization in hydrothermal systems; due to heat and mass exchange at the interface between the earth surface, hydrosphere and atmosphere, it is very important to consider the hydro-geological effect of the deep earth pore-fluids such as H2O and CO2 on the global warming and climate change in future investigations.赵崇斌 彭省临 刘亮明 B. E. HOBBS A. ORD 2008Journal of Central South University of Technology2008,15,1:2
18Measurement planning for circular cross-section tunnels using terrestrial laser scanning显示文摘Ramón Argüelles-Fraga Celestino Ordó?ez Silverio García-Cortés Javier Roca-Pardi?as 2013Automation in Construction2013,,:2
19Ulcerative colitis显示文摘Ingrid Ordás Lars Eckmann Mark Talamini Daniel C Baumgart William J Sandborn 2012The Lancet2012,,9853:2
20Six Hundred Fifty Consecutive Pancreaticoduodenectomies in the 1990s: Pathology, Complications, and Outcomes显示文摘Charles J. Yeo John L. Cameron Taylor A. Sohn Keith D. Lillemoe Henry A. Pitt Mark A. Talamini Ralph H. Hruban Sarah E. Ord Patricia K. Sauter JoAnn Coleman Marianna L. Zahurak Louise B. Grochow Ross A. Abrams 1997Annals of Surgery1997,,3:2
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