bluuebunny/crossref_metadata_2025_split huggingface dataset:
Design of a wireless anchoring and extending micro robot system for gastrointestinal tract
Authors: Lin Wei , Shi Yuting , Jia Zhiwei , Yan Guozheng 
Published: March 2012

AbstractBackgroundDiagnosis and treatment using a conventional endoscope in the gastrointestinal (GI) tract are very common nowadays. However, endoscopy has some disadvantages.MethodsThis paper describes a wireless micro‐robot for active locomotion in the GI tract. After design and analysis of the anchoring‐extending gait, two mechanisms were developed to meet the gait requirements. These actuation and transmission mechanisms were demonstrated in detail to explain the gait implementation. The mechanisms were driven by a micro‐brush direct current motor with a micro‐normal module (m = 0.2 mm) gearbox. The force of the mechanisms was tested to guarantee the sufficiency of the gait and the safety of the robot. After mounting a dedicated video capture unit and wireless power receiving coils, in vitro experiments were conducted to show the feasibility of locomotion by wireless power supply.ResultsThe assembled micro‐robot was 13 mm in diameter and 90 mm in length, with a velocity of 1 mm/s at 500 mW power consumption.ConclusionsThe proposed anchoring and extending intestinal micro‐robot met the requirements of intestinal disease diagnosis and treatment. Copyright © 2012 John Wiley & Sons, Ltd.
Parametric stress distribution and displacement functions for tall buildings under lateral loads
Authors: Rahgozar Reza , Ahmadi Ali Reza , Ghelichi Mostafa , Goudarzi Younes , Malekinejad Mohsen , Rahgozar Peyman 
Published: March 2012

SUMMARYIn this study, effects of applying higher order axial displacement distribution to solve a continuum model for static analysis of the combined system of framed tube, shear core and outrigger–belt truss system in high‐rise buildings are investigated. Framed tube system is modeled using an orthotropic box beam analogy approach and the interaction between shear core and outrigger–belt truss system on framed tube is modeled with rotating spring placed at outrigger–belt truss location. The axial displacement distributions in web and flange panels along structure's height are proposed to be fifth‐order and fourth‐order polynomials, respectively. Analytic analyses are carried out on the basis of the principle of minimum potential energy. A detailed work is carried out through two numerical examples and the accuracy of proposed approximation functions is compared with previous work and finite element analysis. Results demonstrate that the proposed parametric stress distribution and displacement functions are more accurate than previously proposed functions in comparison with the finite element solution. Copyright © 2012 John Wiley & Sons, Ltd.
Numerical investigation of rotational augmentation for S822 wind turbine airfoil
Authors: Gross A. , Fasel H. F. , Friederich T. , Kloker M. J. 
Published: March 2012

ABSTRACTDirect numerical simulations were carried out for an S822 wind turbine blade section at a chord Reynolds number of Re = 100, 000 and an angle of attack of α = 5°. Results for a stationary non‐rotating blade section compare favorably with wind tunnel data by the University of Illinois at Urbana‐Champaign and XFoil predictions. By adding volume forcing terms to the right‐hand side of the Navier–Stokes equations, the Coriolis and centrifugal accelerations resulting from blade rotation are modeled in the blade section simulations. Blade rotation is shown to delay separation especially near the hub, resulting in a lift increase of up to 100% and a drag reduction. The simulations provide insight into a physical mechanism that offers an explanation for the lift increase observed for rotating blade sections when compared with stationary blade sections, which is commonly referred to as rotational augmentation. Rotation is shown to lead to a radial velocity component toward the blade tip in areas where the velocity is substantially different from its free‐stream value, such as near the stagnation point and especially in the separated flow region, and to the appearance of stationary and traveling crossflow vortices. A linear stability theory analysis that compares favorably with the simulation data provides proof that the primary instabilities are of a mixed type, including both a two‐dimensional mode (Tollmien–Schlichting and Kelvin–Helmholtz type) and a stationary and unsteady crossflow mode. The crossflow instabilities accelerate transition, leading to separation delay, lift increase and drag reduction. This effect is very pronounced at 20% blade radius and still present at 80% radius. Because periodicity conditions were applied in the spanwise direction, the present results provide an explanation for rotational augmentation that is not based on the transfer of fluid from the inboard region toward the blade tip (‘centrifugal pumping’). For the low Reynolds number conditions considered here, crossflow instabilities, which destabilize the flow leading to earlier transition and a separation delay, may contribute to rotational augmentation. Copyright © 2012 John Wiley & Sons, Ltd.
Adrenalectomy Improves Outcomes of Selected Patients with Metastatic Carcinoma
Authors: Vazquez Bianca J. , Richards Melanie L. , Lohse Christine M. , Thompson Geoffrey B. , Farley David R. , Grant Clive S. , Huebner Marianne , Moreno Jose 
Published: March 2012

AbstractBackgroundIndications and survival benefit for adrenalectomy (ADX) in the setting of metastasis are not clearly defined. We aimed to determine which patients with primary malignancies may benefit from ADX performed for metastasis. Mayo Clinic institutional outcomes in patients with metastatic disease to the adrenal(s) treated by adrenalectomy were compared to stage‐matched historical controls from the Surveillance Epidemiology and End Results (SEER) database.MethodsA retrospective review (1992–2010) was conducted to identify patients treated with ADX for metastatic cancer at Mayo Clinic, Rochester. Associations of clinical, surgical, and pathologic features with overall survival (OS) were evaluated using Cox proportional regression models. OS for those treated with ADX was compared with that for SEER database stage‐matched patients who underwent primary resection without resection of distant disease using log‐rank tests.ResultsA total of 166 patients underwent ADX for metastatic primaries involving the kidney 60, lung 24, sarcoma 19, colon 15, pancreas 13, and other‐35. Patients with sarcoma and kidney, lung, and pancreatic tumors who underwent ADX had better OS at 1, 2, and 3 years than did the SEER‐matched controls. Respectively, the rates were for sarcoma (100, 93, 86% vs. 57, 36, 30%), kidney (86, 80, 72% vs. 55, 37, 27%), lung (91, 69, 52% vs. 52, 34, 25%), and pancreas (79, 56, 45% vs. 33, 20, 12%). Univariate analysis identified primary diagnosis <2 years before ADX, other distant site, pancreatic primary, palliative operation, and persistent disease as risk factors for death.ConclusionsAn aggressive surgical approach results in improved OS in patients with metastatic disease arising from soft tissues, kidney, lung, and pancreas. Other tumors may benefit, but larger study cohorts are needed for a meaningful comparison.
Resection of Pulmonary Metastases from Hepatocellular Carcinoma following Liver Transplantation
Authors: Hwang Shin , Kim Yong‐Hee , Kim Dong Kwan , Ahn Chul‐Soo , Moon Deog‐Bok , Kim Ki‐Hun , Ha Tae‐Yong , Song Gi‐Won , Jung Dong‐Hwan , Kim Hyeong Ryul , Park Gil‐Chun , Namgoong Jeong‐Man , Yoon Sam‐Youl , Jung Sung‐Won , Park Seung Il , Lee Sung‐Gyu 
Published: March 2012

AbstractBackgroundThis study was intended to assess the effect of resection of pulmonary metastasis (PM) of hepatocellular carcinoma (HCC) after liver transplantation (LT). No effective treatment modality exists for PM‐HCC, and little is known about the posttransplant outcomes of pulmonary metastasectomy (PMT).MethodsOf 587 adult LT recipients diagnosed with HCC, 43 had PM‐HCC. We retrospectively compared outcomes in 23 patients who underwent PMT and 20 who did not. PMT was precluded in ten patients in the non‐PMT group by multiple (usually ≥5) lung nodules, in nine by lung nodules with concurrent or residual extrapulmonary metastasis, and in one by comorbidity.ResultsOf the 23 patients in the PMT group, 14 underwent a single session of PMT, 7 underwent 2 sessions each, and 2 underwent 3 sessions each, for a total of 34 sessions. There were no surgery‐related deaths or complications. After first PMT, 41 nodules, each 0.2–2.5 cm in diameter, were observed: 1–5 nodules per patient. Every available treatment was provided to patients with post‐PMT recurrence and those in the non‐PMT group to control pulmonary and extrapulmonary metastases. Patient survival rates before PM diagnosis did not differ between the two groups (p = 0.141). However, 2 year post‐PM survival rate was significantly greater in the PMT group (30.6% vs. 0%, p = 0.007), resulting in a significantly greater overall 5 year survival rate (44.7% vs. 12.8%, p = 0.017). Univariate analysis showed no risk factor significantly associated with patient survival after PMT.ConclusionsPMT should be performed for resectable PM‐HCC because it may provide a chance of long‐term survival.
Escaping mass approach for inclined plane and round buoyant jets
Authors: Yannopoulos P. C. , Bloutsos A. A. 
Published: March 2012

AbstractAn integral model predicting the mean flow and mixing properties of inclined plane and round turbulent buoyant jets in a motionless environment of uniform density is proposed. The escaping masses from the main buoyant jet flow are simulated, and the model can be successfully applied to initial discharge inclinations${\theta }_{0} $from 90 to$\ensuremath{-} 7{5}^{\ensuremath{\circ} } $with respect to the horizontal plane. This complementary approach introduces a concentration coefficient, which is calibrated using experimental evidence. The present model has incorporated the second-order approach and, regarding the jet-core region, a jet-core model based on the advanced integral model for the production of more correct transverse profiles of the mean axial velocities and mean concentrations than the common Gaussian or top-hat profiles. The partial differential equations for momentum and tracer conservation are written in orthogonal and cylindrical curvilinear coordinates for inclined plane and round buoyant jets, respectively, and they are integrated under the closure assumptions of (a) quasi-linear spreading of the mean flow and mixing fields, and (b) known transverse profile distributions. The integral forms are solved by employing the Runge–Kutta algorithm. Since the most important contribution in the present model is the simulation of the escaping masses, the model has been called the escaping mass approach (EMA). Herein EMA is applied to predict the mean flow properties (trajectory characteristics, mean axial velocities and mean concentrations) for inclined plane and round buoyant jets. The results predicted are compared with experimental data available in the literature, and the accuracy obtained is more than satisfactory. The performance of the EMA is up to 56 % better than using classical integral procedures. EMA can be used for design purposes and for environmental impact assessment studies.
Propagation of capillary waves and ejection of small droplets in rapid droplet spreading
Authors: Ding H. , Li E. Q. , Zhang F. H. , Sui Y. , Spelt P. D. M. , Thoroddsen S. T. 
Published: March 2012

AbstractA new regime of droplet ejection following the slow deposition of drops onto a near-complete wetting solid substrate is identified in experiments and direct numerical simulations; a coalescence cascade subsequent to pinch-off is also observed for the first time. Results of numerical simulations indicate that the propagation of capillary waves that lead to pinch-off is closely related to the self-similar behaviour observed in the inviscid recoil of droplets, and that motions of the crests and troughs of capillary waves along the interface do not depend on the wettability and surface tension (or Ohnesorge number). The simulations also show that a self-similar theory for universal pinch-off can be used for the time evolution of the pinching neck. However, although good agreement is also found with the double-cone shape of the pinching neck for droplet ejection in drop deposition on a pool of the same liquid, substantial deviations are observed in such a comparison for droplet ejection in rapid drop spreading (including the newly identified regime). This deviation is shown to result from interference by the solid substrate, a rapid downwards acceleration of the top of the drop surface and the rapid spreading process. The experiments also confirm non-monotonic spreading behaviour observed previously only in numerical simulations, and suggest substantial inertial effects on the relation between an apparent contact angle and the dimensionless contact-line speed.
Unsteady turbulent plume models
Authors: Scase M. M. , Hewitt R. E. 
Published: March 2012

AbstractFour existing integral models of unsteady turbulent plumes are revisited. We demonstrate that none of these published models is ideal for general descriptions of unsteady behaviour and put forward a modified model. We show that the most recent (top-hat) plume model (Scase et al. J. Fluid Mech., vol. 563, 2006, p. 443), and the earlier (Gaussian) plume models (Delichatsios J. Fluid Mech., vol. 93, 1979, p. 241; Yu Trans. ASME, vol. 112, 1990, p.186), are all ill-posed. This ill-posedness arises from the downstream growth of short-scale waves, which have an unbounded downstream growth rate. We show that both the top-hat and the Gaussian (Yu) models can be regularized, rendering them well-posed, by the inclusion of a velocity diffusion term. The effect of including this diffusive mechanism is to include a vertical structure in the model that can be interpreted as representing the vertical extent of an eddy. The effects of this additional mechanism are small for steady applications, and cases where the plume forcing can be considered to follow a power law (both of which have been studied extensively). However, the inclusion of diffusion is shown to be crucial to the general initial-value problem for unsteady models.
Effect of environment and fallow period onCosmopolites sordiduspopulation dynamics at the landscape scale
Authors: Duyck P.-F. , Dortel E. , Vinatier F. , Gaujoux E. , Carval D. , Tixier P. 
Published: March 2012

AbstractUnderstanding how the population dynamics of insect pests are affected by environmental factors and agricultural practices is important for pest management. To investigate how the abundance of the banana weevil,Cosmopolites sordidus(Coleoptera: Curculionidae), is related to environmental factors and the length of the fallow period in Martinique, we developed an extensive data set (18,130 observations of weevil abundance obtained with pheromone traps plus associated environmental data) and analysed it with generalized mixed-effects models.At the island scale,C. sordidusabundance was positively related to mean temperature and negatively related to mean rainfall but was not related to soil type. The number of insects trapped was highest during the driest months of the year. Abundance ofC. sordidusdecreased as the duration of the preceding fallow period increased.The latter finding is inconsistent with the view that fallow-generated decomposing banana tissue is an important resource for larvae that leads to an increase in the pest population. The results are consistent with the view that fallows, in association with pheromone traps, are effective for the control of the banana weevil.
Why is Quebec Separatism off the Agenda? Reducing National Unity Crisis in the Neoliberal Era
Authors: Changfoot Nadine , Cullen Blair 
Published: March 2012

Abstract.The development of federalism in the context of the neoliberal era in the 2000s has partly created the conditions for a more stable co-operation between the federal and Quebec governments, contributing to the trend of separatism being sidelined in Quebec. In the context of neoliberalism, federal–provincial agreements have created conditions for just enough asymmetry in the relationship between the federal government and Quebec, something that Quebec has historically demanded, for separatism to remain off the agenda. What separates this relationship from past ones is a significant change in the context whereby the neoliberal orientation is becoming the common currency for co-operation. If Canadian federalism continues its present course under neoliberalism without any major mishaps, for the first time since the divisive period of the 1990s and early 2000s, federal–Quebec relations likely will be stable without national unity crises of the kind that culminated in the 1980 and 1995 Quebec referenda on sovereignty.Résumé.Le développement du fédéralisme dans le contexte de l'ère néolibérale dans les années 2000 a en partie créé les conditions pour une coopération plus stable entre les gouvernements fédéral et québécois, contribuant ainsi à la tendance du séparatisme au Québec d'être marginalisés. Dans le contexte du néolibéralisme, des ententes fédérales-provinciales ont créé les conditions pour un peu assez de relation asymétrique entre le gouvernement fédéral et du Québec, quelque chose que le Québec a toujours exigé, au séparatisme de rester hors l'ordre du jour. Ce qui sépare cette relation de celles du passé est un changement significatif dans le contexte dans lequel l'orientation néo-libérale devient la monnaie commune pour la coopération. Si le fédéralisme canadien continue son cours actuel sous le néolibéralisme sans encombre majeur, pour la première fois depuis la période de division des années 1990 et début des années 2000, les relations fédérales-Québec probablement seront stable sans crises unité nationale du genre qui a culminé dans les années 1980 et 1995 référendums sur la souveraineté du Québec.
The Securitization of the US–Canada Border in American Political Discourse
Authors: Salter Mark B. , Piché Geneviève 
Published: March 2012

Abstract.In this paper, the authors analyze the empirical process of securitization of the US–Canada border and then reflect on the model proposed by the Copenhagen School. We argue that securitization theory oversimplifies the political process of securitizing moves and audience acceptance. Rather than attributing securitization to a singular speaker addressing a specific audience, we present overlapping and ongoing language security games performed by varying relevant actors during the key period between the Intelligence Reform and Terrorism Prevention Act (IRTPA) in December 2004 and the signing of the Security and Prosperity Partnership of North America (SPP) in June 2005, showing how multiple speakers participate in the continuing construction of a context in which this issue is increasingly treated as a matter of security. We also explore the language adopted by participants in the field, focusing on an expert panel convened by the Homeland Security Institute. We conclude that in the securitization of the US–Canada border there are inconsistencies between truth and discourse, as well as significant distinctions between official and bureaucratic discourses, further emphasizing the importance of a comprehensive model of securitization.Résumé.Dans cet article, les auteurs font l'analyse du processus empirique de la sécurisation de la frontière Canado-Américaine à travers la réflexion sur le modèle proposé par l'École de Copenhague. Nous soutenons que cette théorie de sécurisation simplifie trop le processus politique de son initiation et de l'acceptation de l'auditeur. Au lieu d'attribuer la sécurisation à un orateur, s'adressant à un public particulier, nous présentons les jeux de langage continuels effectués par plusieurs acteurs pendant la période suivant la Intelligence Reform and Terrorism Prevention Act (IRTPA) en décembre 2004, jusqu'à l'approbation de la Security and Prosperity Partnership of North America (SPP) en juin 2005. Nous maintenons que plusieurs orateurs participent dans la construction continuelle du contexte dans lequel l'affaire est de plus en plus comprise dans le cadre de sécurité. Nous explorons aussi le langage employé par les participants dans le champ, observant surtout un groupe d'experts convoqué au Homeland Security Institute. Nous concluons que dans le cas de la sécurisation de la frontière Canado-Américaine il existe des incohérences entre le discours et le réel, ainsi que des distinctions significatives entre les discours officiels et bureaucratiques, mettant l'accent sur l'importance d'un modèle compréhensif de sécurisation.
Citing as a Site: Translation and circulation in Muslim South and Southeast Asia
Authors: RICCI RONIT 
Published: March 2012

AbstractNetworks of travel and trade have often been viewed as central to understanding interactions among Muslims across South and Southeast Asia. In this paper I suggest that we consider language and literature as an additional type of network, one that provided a powerful site of contact and exchange facilitated by, and drawing on, citation. I draw on textual sources written in Javanese, Malay, and Tamil between the sixteenth and early twentieth centuries to argue that among Muslim communities in South and Southeast Asia, practices of reading, learning, translating, adapting, and transmitting contributed to the shaping of a cosmopolitan sphere that was both closely connected with the broader, universal Muslim community and rooted in local identities. I consider a series of ‘citation sites’ in an attempt to explore one among many modes of inter-Asian connections, highlighting how citations, simple or brief as they may often seem, are sites of shared memories, history, and narrative traditions and, in the case of Islamic literature, also sites of a common bond to a cosmopolitan and sanctified Arabic.
The effect of spatial heterogenity on the aggregation of ticks on white-footed mice
Authors: DEVEVEY G. , BRISSON D. 
Published: March 2012

SUMMARYParasites are often aggregated on a minority of the individuals in their host populations. Although host characteristics are commonly presumed to explain parasite aggregation on hosts, spatio-temporal aggregation of parasites during their host-seeking stages may have a dominant effect on the aggregation on hosts. We aimed to quantify, using mixed models, repeatability and autocorrelation analyses, the degree to which the aggregation of blacklegged ticks (Ixodes scapularis) on white-footed mice (Peromyscus leucopus) is influenced by spatio-temporal distributions of the host-seeking ticks and by heterogeneity among mice. Host-seeking ticks were spatially aggregated at both the larval and nymphal life-stages. However, this spatial aggregation accounted for little of the variation in larval and nymphal burdens observed on mice (3% and 0%, respectively). Conversely, mouse identity accounted for a substantial proportion of the variance in tick burdens. Mouse identity was a significant explanatory factor as the majority of ticks parasitized a consistent set of mice throughout the activity seasons. Of the characteristics associated with mouse identity investigated, only gender affected larval burdens, and body mass and home range sizes in males were correlated with nymphal burdens. These analyses suggest that aggregation of ticks on a minority of mice does not result from the distribution of host-seeking ticks but from characteristics of the hosts.