检索结果-南通市图书馆

Current Zoology 2010年第2期56卷 259-263页

作者： Andy REUNER Steffen HENGHERR Franz Brümmer ralph O.SCHILL Universitt Stuttgart Biological Institute Zoology UniversittStuttgart Biological Institute Zoology

The impact of starvation and anhydrobiosis on the number and size of the storage cells in the tardigrade species Milnesiumtardigradum, Paramacrobiotus tonollii and Macrobiolus sapiens was investigated to gain more insight on the energeticside of anhydrobiosis. Storage cells are free floating cells within the body cavity of tardigrades and are presumed to store and releaseenergy in form of glycogen, protein and fat to maintain a constant nutrient regime for the other tissues. The body size of theanimals was not correlated with the size of the storage cells, however, M. tardigradum the largest species analysed also had thelargest storage cells. A reduction in the size of the storage cells is apparent in all three species after seven days of starvation. Aseven-day period of anhydrobiosis leads to a decrease in cell size in M. tardigradum but not in P. tonollii and M. sapiens. AlthoughM. sapiens was raised on green algae, and M. tardigradum and P. tonollii were fed with rotifers and nematodes this differencein nourishment was not reflected in the response of the storage cells to

关键词：存储单元缓步动物生活脱水饥饿体腔细胞动物物种自由浮动

Vascular emergencies in cholelithiasis and cholecystectomy: our experience with two cases and literature review

在线全文

学校读者我要写书评

暂无评论

Hepatobiliary & Pancreatic Diseases International 2008年第2期7卷 217-220页

作者： Narasimhaiah Srinivasaiah Maneesh Bhojak ralph Jackson Sean Woodcock Department of Surgery North Tyneside General Hospital Tyne and Wear UK Department of Radiology Freeman Hospital Tyne and Wear UK

BACKGROUND:Complications from gallstones and laparoscopic cholecystectomy can be serious and fatal if there is a delay in recognition and treatment. We aim to present two unusual, life threatening vascular complications as a result of gallstones and laparoscopic cholecystectomy. Their management is highlighted with a brief review of literature. METHODS:Data for the article were gathered from clinical case note review. Radiology database was used for images. A brief literature review was undertaken using Pubmed search. The keyword used included hemobilia, pseudoaneurysm, arterio-biliary fistula and laparoscopic cholecystectomy. RESULTS:The article highlights two individual case reports. The first case constitutes an 81-year woman who had cystic arterial erosion causing hematemesis, while the second patient was a 57-year man who presented with hemobilia from a pseudoaneurysm of right hepatic artery (RHA) following laparoscopic cholecystectomy. Cystic arterial erosion was treated with subtotal cholecystectomy with duodenal defect closure while the pseudoaneurysm underwent radiological intervention. CONCLUSIONS:Cystic artery erosion and pseudoaneurysm causing arteriobiliary fistula are rare vascular complications related to the biliary tree. A high index of suspicion and timely intervention is important. Trauma to arteries should be avoided during laparoscopic cholecystectomy.

关键词： laparoscopic cholecystectomy hemobilia hematemesis pseudoaneurysm

Exploiting AML algorithm for multiple acoustic source 2D and 3D DOA estimations

在线全文

学校读者我要写书评

暂无评论

控制理论与应用（英文版） 2011年第1期9卷 34-43页

作者： Juo-Yu LEE ralph E. HUDSON Kung YAO Electrical Engineering Department University of CaliforniaLos AngelesCalifornia 90095-1594U.S.A.

The approximate maximum likelihood (AML) algorithm shows promises for joint estimations of acoustic source spectrum and direction-of-arrival (DOA). For the multisource case, the AML algorithm remains feasible as one considers an alternating projection procedure based on sequential iterative search on single source parameters. In order to perform multisource beamforming operations, earlier, we used a two-dimensional (2D) sensor array with 2D AML to obtain the DOA estimations for sources in the far field of the array. Now, the 3D AML algorithm enables a 3D sensor array to collect acoustic data for estimation of DOA represented in azimuth and elevation angles. In this paper, we consider two acoustic sources being simultaneously active and derive Crame′r-Rao bound (CRB) on DOA estimation given by a 3D array. Also, we compare the two-source DOA estimation results of 2D AML and 3D AML, respectively. To construct reasonable constraints on sensor topology, we adopt the concept of isotropic array and decouple the interplay between azimuth and elevation angle variations. The 3D AML algorithm exhibits superior spatial separation over its 2D counterpart for multiple sources located at different azimuth and elevation angles. Although the 3D AML algorithm requires more demanding computational complexity, we have developed a number of efficiency enhancements to reduce the loading for the grid search.

关键词： Approximate maximum likelihood Direction-of-arrival Alternating projection procedure

Panorama completion for street views

在线全文

学校读者我要写书评

暂无评论

Computational Visual Media 2015年第1期1卷 49-57页

作者： Zhe Zhu ralph R.Martin Shi-Min Hu TNLIST Department of Computer Science and Technology Tsinghua University School of Computer Science & Informatics Cardiff University

This paper considers panorama images used for street views. Their viewing angle of 360° causes pixels at the top and bottom to appear stretched and warped. Although current image completion algorithms work well, they cannot be directly used in the presence of such distortions found in panoramas of street views. We thus propose a novel approach to complete such 360° panoramas using optimizationbased projection to deal with distortions. Experimental results show that our approach is efficient and provides an improvement over standard image completion algorithms.

关键词： image completion panorama street views structure-rectifying warp

Harmonic Field Based Volume Model Construction from Triangle Soup

在线全文

学校读者我要写书评

暂无评论

Journal of Computer Science & Technology 2010年第3期25卷 562-571页

作者：沈超慧张国鑫来煜坤胡事民 ralph R. Martin Tsinghua National Laboratory for Information Science and Technology Department of Computer Science and Technology Tsinghua University School of Computer Science Cardiff University

Surface triangle meshes and volume data are two commonly used representations of digital geometry. Converting from triangle meshes to volume data is challenging, since triangle meshes often contain defects such as small holes, internal structures, or self-intersections. In the extreme case, we may be simply presented with a set of arbitrarily connected triangles, a ＂triangle soup＂. This paper presents a novel method to generate volume data represented as an octree from a general 3D triangle soup. Our motivation is the Faraday cage from electrostatics. We consider the input triangles as forming an approximately closed Faraday cage, and set its potential to zero. We then introduce a second conductor surrounding it, and give it a higher constant potential. Due to the electrostatic shielding effect, the resulting electric field approximately lies in that part of space outside the shape implicitly determined by the triangle soup. Unlike previous approaches, our method is insensitive to small holes and internal structures, and is observed to generate volumes with low topological complexity. While our approach is somewhat limited in accuracy by the requirement of filling holes, it is still useful, for example, as a preprocessing step for applications such as mesh repair and skeleton extraction.

关键词： volume model triangle soup harmonic field representation conversion mesh repair

Robust tracking-by-detection using a selection and completion mechanism

在线全文

学校读者我要写书评

暂无评论

Computational Visual Media 2017年第3期3卷 285-294页

作者： Ruochen Fan Fang-Lue Zhang Min Zhang ralph R.Martin Tsinghua University School of Engineering and Computer Science Victoria University of Wellington Center of Mathematical Sciences and Applications Harvard University School of Computer Science and Informatics Cardiff University

It is challenging to track a target continuously in videos with long-term occlusion,or objects which leave then re-enter a *** tracking algorithms combined with onlinetrained object detectors perform unreliably in complex conditions, and can only provide discontinuous trajectories with jumps in position when the object is occluded. This paper proposes a novel framework of tracking-by-detection using selection and completion to solve the abovementioned problems. It has two components, tracking and trajectory completion. An offline-trained object detector can localize objects in the same category as the object being tracked. The object detector is based on a highly accurate deep learning model. The object selector determines which object should be used to re-initialize a traditional tracker. As the object selector is trained online,it allows the framework to be adaptable. During completion, a predictive non-linear autoregressive neural network completes any discontinuous *** tracking component is an online real-time algorithm, and the completion part is an after-theevent mechanism. Quantitative experiments show a significant improvement in robustness over prior stateof-the-art methods.

关键词： object tracking detection proposal selection trajectory completion

Anatomic Correlates of Mitral Systolic Anterior Motion in Transposition of the Great Arteries Following Atrial Switch Operation

在线全文

学校读者我要写书评

暂无评论

Congenital Heart Disease 2023年第3期18卷 267-277页

作者： Norman Aiad Mark V.Sherrid Adam J.Small Youssef Elnabawi Jodi Feinberg Leon Axel ralph Mosca T.K.Susheel Kumar Michael Argilla Dan G.Halpern Cardiovascular Division Leon H.Charney Division of CardiologyNYU Langone HealthSchool of MedicineNew York University GrossmanNew YorkUSA Department of Cardiovascular Disease Medical SchoolThe University of MinnesotaMinneapolisUSA The Lillehei Heart Institute MinneapolisMNUSA Radiology Department NYU Langone HealthSchool of MedicineNew York University GrossmanNew YorkUSA Cardiothoracic Surgery Department NYU Langone HealthSchool of MedicineNew York University GrossmanNew YorkUSA Pediatric Cardiology Division NYU Langone HealthSchool of MedicineNew York University GrossmanNew YorkUSA Department of Internal Medicine NYU Langone HealthSchool of MedicineNew York University GrossmanNew YorkUSA

Introduction:We sought to investigate whether the development of sub-pulmonic systolic anterior motion(SAM)may be inherent to the anatomy of the the mitral valve(MV)or affected by external factors,such as a dilated right ventricle or chest abnormalities in d-looped transposition of the great arteries post atrial switch operation(d-TGA/AtS).Methods:Analysis was performed of clinical and cardiac imaging studies acquired on 19 adult patients with d-TGA/AtS(age 42±6 years old,56%male)between 2015–*** data included mitral apparatus anatomy,and CT/MRI data included biventricular dimensions,function,and Haller index(HI)for pectus ***:Patients with leaflet SAM(n=6)compared to patients without SAM(n=13)had higher MV protrusion height(2.3±0.5 vs.1.5±0.4 cm,p≤0.01)and longer anterior MV leaflet length(3.1±0.4 cm vs.2.6±0.3 cm p≤0.05),when compared to those ***/MRI showed higher sub-pulmonic left ventricular ejection fraction(LVEF)in the SAM group(71%±8%vs.54%±7%,respectively).RV size and function,significant chest deformity(HI>3.5),presence of a ventricular lead pacemaker,and septal thickness did not play a role in development of ***:An elongated mitral apparatus is associated with the development of SAM,and the development of left ventricular outflow tract obstruction(LVOTO),in d-TGA/*** hyperkinesia is associated with *** RV dimensions,septal thickness,and degree of chest deformity did not differ significantly between subjects with SAM and those without.

关键词： d-loop transposition of the great arteries mustard operation senning operation systolic anterior motion of the mitral valve echocardiography cardiac MRI

Principles of carbon nanotube dielectrophoresis

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Nano Research 2021年第7期14卷 2188-2206页

作者： Wenshan Li Frank Hennrich Benjamin S.Flavel Simone Dehm Manfred Kappes ralph Krupke Institute of Nanotechnology Karlsruhe Institute of TechnologyKarlsruhe 76021Germany Institute of Physical Chemistry Karlsruhe Institute of TechnologyKarlsruhe 76021Germany Institute of Materials Science Technische Universität DarmstadtDarmstadt 64287Germany Institute for Quantum Materials and Technologies Karlsruhe Institute of TechnologyKarlsruhe 76021Germany School of Mechanical Engineering Shanghai Jiao Tong UniversityNo.800 Dongchuan RoadShanghai 200240Chin

Dielectrophoresis(DEP)describes the motion of suspended objects when exposed to an inhomogeneous electric *** has been successful as a method for parallel and site-selective assembling of nanotubes from a dispersion into a sophisticated device *** have conducted extensive works to understand the DEP of nanotubes in aqueous ionic surfactant ***,only recently,DEP was applied to polymer-wrapped single-walled carbon nanotubes(SWCNTs)in organic solvents due to the availability of ultra-pure SWCNT *** this paper,the focus is on the difference between the DEP in aqueous and organic *** starts with an introduction into the DEP of carbon nanotubes(CNT-DEP)to provide a comprehensive,in-depth theoretical background before discussing in detail the experimental procedures and *** academic interests,this work focuses on the CNT-DEP deposition scheme,discusses the importance of the electrical double layer,and employs finite element simulations to optimize CNT-DEP deposition condition with respect to the experimental *** important outcome is an understanding of why DEP in organic solvents allows for the deposition and alignment of SWCNTs in low-frequency and even static electric fields,and why the response of semiconducting SWCNTs(s-SWCNTs)is strongly enhanced in non-conducting,weakly polarizable *** to further improve CNT-DEP for s-SWCNT-relevant applications are given as ***,this work should serve as a practical guideline to select the appropriate setting for effective CNT DEPs.

关键词： single-walled carbon nanotubes hydrodynamics assembly deposition alignment polarizability dielectrophoresis

Zeno’s Paradoxes and Lie Tzu’s Dichotomic Wisdom Explained with Alpha Beta (αβ) Asymptotic Nonlinear Math (Including One Example on Second Order Nonlinear Phenomena)

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Applied Mathematics and Physics 2023年第5期11卷 1209-1249页

作者： ralph W. Lai Melisa W. Lai-Becker Evgenios Agathokleous 28 Cornerstone Ct. Doylestown PA USA Harvard Medical School Cambridge MA USA Department of Ecology School of Applied Meteorology Nanjing University of Information Science and Technology Nanjing China

Zeno’s paradoxes are a set of philosophical problems that were first introduced by the ancient Greek philosopher Zeno of Elea. Here is the first attempt to use asymptotic approach and nonlinear concepts to address the paradoxes. Among the paradoxes, two of the most famous ones are Zeno’s Room Walk and Zeno’s Achilles. Lie Tsu’s pole halving dichotomy is also discussed in relation to these paradoxes. These paradoxes are first-order nonlinear phenomena, and we expressed them with the concepts of linear and nonlinear variables. In the new nonlinear concepts, variables are classified as either linear or nonlinear. Changes in linear variables are simple changes, while changes in nonlinear variables are nonlinear changes relative to their asymptotes. Continuous asymptotic curves are used to describe and derive the equations for expressing the relationship between two variables. For example, in Zeno’s Room Walk, the equations and curves for a person to walk from the initial wall towards the other wall are different from the equations and curves for a person to walk from the other wall towards the initial wall. One walk has a convex asymptotic curve with a nonlinear equation having two asymptotes, while the other walk has a concave asymptotic curve with a nonlinear equation having a finite starting number and a bottom asymptote. Interestingly, they have the same straight-line expression in a proportionality graph. The Appendix of this discussion includes an example of a second-order nonlinear phenomenon. .

关键词： Dichotomy Asymptotic Concave and Convex Curve Upper and Bottom As-ymptote Cumulative and Demulative Numbers (Opposite to Cumulative Numbers) Coefficient of Determination Skewed Bell Sigmoid Curve