Stereo modeling of HVEM specimens by serial tilting and computer graphics

1986 ◽  
Vol 44 ◽  
pp. 34-35
Author(s):  
J.R. McIntosh ◽  
D.L. Stemple ◽  
William Bishop ◽  
G.W. Hannaway
Keyword(s):  
Computer Graphics ◽  
Analytical Methods ◽  
Photographic Film ◽  
Complex Structures ◽  
Multiple Objects ◽  
Multiple Images ◽  
3 Dimensional

EM specimens often contain 3-dimensional information that is lost during micrography on a single photographic film. Two images of one specimen at appropriate orientations give a stereo view, but complex structures composed of multiple objects of graded density that superimpose in each projection are often difficult to decipher in stereo. Several analytical methods for 3-D reconstruction from multiple images of a serially tilted specimen are available, but they are all time-consuming and computationally intense.

scholarly journals About Zero Torsion Linear Maps on Lie Algebras

ISRN Algebra ◽  
2011 ◽  
Vol 2011 ◽  
pp. 1-16
Author(s):  
Louis Magnin
Keyword(s):  
Lie Algebra ◽  
Lie Algebras ◽  
Equivalence Classes ◽  
Explicit Description ◽  
Complex Structures ◽  
Linear Map ◽  
3 Dimensional ◽  
Linear Maps

We prove that any zero torsion linear map on a nonsolvable real Lie algebra is an extension of some CR-structure. We then study the cases of (2, ) and the 3-dimensional Heisenberg Lie algebra . In both cases, we compute up to equivalence all zero torsion linear maps on , and deduce an explicit description of the equivalence classes of integrable complex structures on .

scholarly journals INVESTIGATION OF PHYSICAL PHENOMENA OCCURRED IN CONTACT AREA OF BULK PARTICLES AT THEIR MOTION IN SCREW DRUMS BY METHODS OF SIMILARITY THEORY, ENGINEERING AND COMPUTER GRAPHICS

2019 ◽  
Vol 2019 (6) ◽  
pp. 20-28 ◽  
Author(s):  
Георгий Серга ◽  
Georgiy Serga ◽  
Дмитрий Серый ◽  
Dmitriy Seryy ◽  
Алексей Марченко ◽  
...  
Keyword(s):  
Computer Graphics ◽  
Infinite Number ◽  
Contact Area ◽  
Analytical Methods ◽  
Similarity Theory ◽  
Descriptive Geometry ◽  
Program Complex ◽  
Engineering Graphics ◽  
Similarity Invariant ◽  
Physical Phenomena

In Trubilin State Agricultural University of Kuban there are created machinery working devices as screw drums allowing the assurance of motion of bulk particles at their horizontal location and also promoting the intensity of particles interaction between each other and with the walls of screw drums which widens technological potentialities and decreases dimensions of equipment and its weight. In the paper there are shown various sorts of screw drums and analytical methods of the study of physical phenomena taking place in the contact area of bulk particles. The search of a screw drum design was carried out by the methods of descriptive geometry and engineering graphics with the aid of the “Compass-3D” program complex. The apparatus of dimensionless kinematic functions (similarity invariant) and the analysis of dimensionalities allowing the investigation not one such a case but their infinite number united by the community of properties was used.

scholarly journals Evaluation of 3-Axial Knee Joint Torques Produced by Compression Sports Tights in Running Motion

Proceedings ◽  
2020 ◽  
Vol 49 (1) ◽  
pp. 69
Author(s):  
Taisei Mori ◽  
Yohei Ogino ◽  
Akihiro Matsuda ◽  
Yumiko Funabashi
Keyword(s):  
Computer Graphics ◽  
Knee Joint ◽  
Numerical Simulations ◽  
Human Subjects ◽  
Joint Torque ◽  
Human Model ◽  
Joint Torques ◽  
3 Dimensional ◽  
Flexion Extension ◽  
Fabric Materials

In this paper, 3-axial knee joint torques given by compression sports tights were performed by numerical simulations using 3-dimensional computer graphics of a human model. Running motions of the human model were represented as the 3-dimensional computer graphics, and the running motions were determined by the motion capturing system of human subjects. Strain distribution on the surface of the 3-dimentional computer graphics of the human model was applied to the boundary conditions of the numerical simulations. An anisotropic hyperelastic model considering stress softening of fabric materials was implemented to reproduce the mechanical characteristics of the compression sports tights. Based on the strain-time relationships, knee joint torques in 3-dimentional coordinates given by the compression sports tights were calculated. As a result, the three types of knee joint torque generated by the compression sports tights in running motions were calculated. From the calculated results, the maximum value of flexion/extension, varus/valgus, and internal/external knee joint torques were given as 2.52, 0.59, and 0.31 Nm, respectively. The effect of compression sports tights on the knee joint was investigated.

Impact of Multiorgan Fusion Imaging and Interactive 3-Dimensional Visualization for Intraventricular Neuroendoscopic Surgery

2011 ◽  
Vol 69 (suppl_1) ◽  
pp. ons40-ons48 ◽  
Author(s):  
Taichi Kin ◽  
Masahiro Shin ◽  
Hiroshi Oyama ◽  
Kyousuke Kamada ◽  
Akira Kunimatsu ◽  
...  
Keyword(s):  
Computer Graphics ◽  
Endoscopic Surgery ◽  
Interactive Visualization ◽  
Magnetic Resonance Images ◽  
Multimodal Fusion ◽  
Imaging Method ◽  
Visualization Method ◽  
Surface Rendering ◽  
3 Dimensional ◽  
Neuroendoscopic Surgery

Abstract BACKGROUND: Imaging technologies have evolved to meet the demand for improved presurgical simulations, particularly with the introduction of endoscopic surgery in the neurosurgical field. OBJECTIVE: To evaluate the effectiveness of a 3-dimensional interactive visualization method with a computer graphics model, which was created using hybrid rendering and multimodal fusion methods for neuroendoscopic surgery, and to assess whether the 2-dimensional interactive visualization method could effectively represent the microsurgical anatomical information necessary for endoscopic surgery compared with conventional 3-dimensional computer graphics models. METHODS: Ten patients scheduled for neuroendoscopic surgery for intraventricular lesions were included in the study. For the 3-dimensional interactive visualization method, a hybrid model of volume and surface rendering was created from magnetic resonance images combined with computed tomography and positron emission tomography. Preoperative radiographic images were fused with the normalized mutual information method. Visibility of anatomic structures was compared between the multifusion models and nonfusion models created from only heavy-T2-weighted images that rely solely on the surface rendering method. RESULTS: The average visibility score of the multifusion models was 97.5% (range, 95.6% to 100%), which was significantly higher than that for nonfusion models (35.9% to 64.1%; P = .002). The multifusion model represents an improved visualization method for preoperative virtual simulation for neuroendoscopic intraventricular surgery. CONCLUSION: Our 3-dimensional imaging method is superior to conventional methods and will greatly improve the safety and effectiveness of neuroendoscopic surgical procedures for complex intraventricular lesions.

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