Automatic Corn Potted-Seedling Transplanter of Cycloid Gear Trains

2014 ◽  
Vol 530-531 ◽  
pp. 960-966 ◽  
Author(s):  
Da Qing Yin ◽  
Jin Wu Wang ◽  
Yun Zhao
Keyword(s):  
Structural Parameters ◽  
Three Dimensional ◽  
Gear Train ◽  
Work Requirements ◽  
Work Requirement ◽  
Computer Aided ◽  
Final Data ◽  
Visual Basic6.0 ◽  
New Type ◽  
Gear Trains

On the basis of the existing potted-seedling transplanting mechanism, a new type of transplanter,a automatic rotary potted seedling transplanter of "Cycloid gear train" was proposed .The trajectory and posture were analyzed while the corn potted seedling was transplanted, the principle and characteristics of the transplanter were demonstrated, the kinematics model was established, and the equation of (anglar) displacement, (anglar ) velocity, and (anglar) acceleration were deduced. Based on above research results, the transplanters computer aided software was developed with Visual Basic6.0, then the structural parameters were calculated which could meet the work requirement . Before the prototype is designed, the feasibility of the structure can be proved through the test of the software, and then the final data would be got: α1=334°, α2=0°, α3=66°, α4=-40°,α5=90°,α6=110°,l1=106mm,l2=187mm.Two-dimensional and three-dimensional drawings were drawn according to above data; the designed model was simulated by ADAMS, the trajectory and posture that meet the work requirements were verified, too.

[Mn12O12(O2CMe)12(NO3)4(H2O)4]: facile synthesis of a new type of Mn12complex

2015 ◽  
Vol 71 (3) ◽  
pp. 185-187 ◽  
Author(s):  
Annaliese E. Thuijs ◽  
George Christou ◽  
Khalil A. Abboud
Keyword(s):  
Single Molecule ◽  
Structural Parameters ◽  
Three Dimensional ◽  
Facile Synthesis ◽  
Intermolecular Hydrogen Bonds ◽  
Acta Cryst ◽  
Dimensional Network ◽  
Type Molecule ◽  
New Type ◽  
Water Ligands

The title dodecanuclear Mn complex, namely dodeca-μ2-acetato-κ24O:O′-tetraaquatetra-μ2-nitrato-κ8O:O′-tetra-μ4-oxido-octa-μ3-oxido-tetramanganese(IV)octamanganese(III) nitromethane tetrasolvate, [Mn12(CH3COO)12(NO3)4O12(H2O)4]·4CH3NO2, was synthesized by the reaction of Mn2+and Ce4+sources in nitromethane with an excess of acetic acid. This compound is distinct from the previously known single-molecule magnet [Mn12O12(O2CMe)16(H2O)4], synthesized by Lis [Acta Cryst.(1980), B36, 2042–2044]. It is the first Mn12-type molecule containing nitrate ligands to be directly synthesized without the use of a preformed cluster. Additionally, this molecule is distinct from all other known Mn12complexes due to intermolecular hydrogen bonds between the nitrate and water ligands, which give rise to a three-dimensional network. The complex is compared to other known Mn12molecules in terms of its structural parameters and symmetry.

The Vibration Influence on the Surrounding Ground by Four-Holes Parallel Tunnel

2014 ◽  
Vol 971-973 ◽  
pp. 2176-2179
Author(s):  
Liang Chang ◽  
Ying Luo ◽  
Xia Bing Liu
Keyword(s):  
International Organizations ◽  
Three Dimensional ◽  
Element Model ◽  
Underground Space ◽  
Computer Aided ◽  
Dimensional Finite Element ◽  
New Type ◽  
Parallel Tunnel ◽  
Subway Train ◽  
Three Dimensional Finite Element

With the development of thetimes, the floor space has been unable to meet human requirements, bututilization of urban underground space has become a kind of choice to solvevarious problems. In recent years, many international organizations andresearch institutions have begun to develop urban underground space, and otherissues have been discussed in a number of meetings. As a new type of transportation, subwaycan effectively solve traffic congestions. This paper applies a kind of computer-aided Engineering,like ANSYS, to establish three-dimensional finite element model offour-hole parallel tunnel, Loadingthe subway train, andthen calculating, finally analyzing rules of vibrationof the surrounding ground of four-hole parallel tunnel when the subway is working.

scholarly journals Computer aided geological design: AutoCAD® applications in structural geology

2017 ◽  
Vol 13 (2) ◽  
pp. 113
Author(s):  
Sebastián González Chiozza
Keyword(s):  
Structural Geology ◽  
Structural Analysis ◽  
3D Modeling ◽  
Dimensional Space ◽  
Structural Parameters ◽  
Three Dimensional ◽  
Geological Structures ◽  
Computer Aided ◽  
Fault Displacement ◽  
Three Dimensional Space

The three-dimensional (3D) modeling environment of AutoCAD is used to represent and solve problems of structural geology. As an alternative to bi-dimensional (2D) techniques of classical structural analysis, the 3D capabilities of the software are used for modeling, positioning and measuring geological structures. To introduce the proposed method, two practical examples are presented as exercises with detailed instructions. The technique consists in precisely representing the geometrical entities that comprise the geological problem within three-dimensional space to enable the direct measurement of structural parameters. Accurate results, such as fault displacement and the attitude of several structures, are obtained with the dimension tools of the program, so no calculations are required. Diverse 3D viewing perspectives can be adopted to enhance the comprehension of the analyzed situation.

Computer-aided methods for 3-D visualization of serial sections and thick biological specimens

1992 ◽  
Vol 50 (2) ◽  
pp. 1060-1061
Author(s):  
Mark Ellisman ◽  
Maryann Martone ◽  
Gabriel Soto ◽  
Eleizer Masliah ◽  
David Hessler ◽  
...  
Keyword(s):  
Alzheimer’S Disease ◽  
Alzheimer's Disease ◽  
Three Dimensional ◽  
Neuritic Plaque ◽  
Dimensional Structure ◽  
Data Sets ◽  
Molecular Physiology ◽  
Research Activities ◽  
Computer Aided ◽  
Dimensional Reconstruction

Structurally-oriented biologists examine cells, tissues, organelles and macromolecules in order to gain insight into cellular and molecular physiology by relating structure to function. The understanding of these structures can be greatly enhanced by the use of techniques for the visualization and quantitative analysis of three-dimensional structure. Three projects from current research activities will be presented in order to illustrate both the present capabilities of computer aided techniques as well as their limitations and future possibilities.The first project concerns the three-dimensional reconstruction of the neuritic plaques found in the brains of patients with Alzheimer's disease. We have developed a software package “Synu” for investigation of 3D data sets which has been used in conjunction with laser confocal light microscopy to study the structure of the neuritic plaque. Tissue sections of autopsy samples from patients with Alzheimer's disease were double-labeled for tau, a cytoskeletal marker for abnormal neurites, and synaptophysin, a marker of presynaptic terminals.

Three-Dimensional Subcellular Organization of Hepatocytes in Intact Liver: Simultaneous Visualization of Cytoskeletal and Membrane Markers by Confocal Microscopy

1996 ◽  
Vol 54 ◽  
pp. 288-289
Author(s):  
Greg V. Martin ◽  
Ann L. Hubbard
Keyword(s):  
Three Dimensional ◽  
Integral Membrane Proteins ◽  
Polarized Secretion ◽  
Microscope Images ◽  
Computer Aided ◽  
Intracellular Organelles ◽  
Cytoskeletal Elements ◽  
Simultaneous Visualization

The microtubule (MT) cytoskeleton is necessary for many of the polarized functions of hepatocytes. Among the functions dependent on the MT-based cytoskeleton are polarized secretion of proteins, delivery of endocytosed material to lysosomes, and transcytosis of integral plasma membrane (PM) proteins. Although microtubules have been shown to be crucial to the establishment and maintenance of functional and structural polarization in the hepatocyte, little is known about the architecture of the hepatocyte MT cytoskeleton in vivo, particularly with regard to its relationship to PM domains and membranous organelles. Using an in situ extraction technique that preserves both microtubules and cellular membranes, we have developed a protocol for immunofluorescent co-localization of cytoskeletal elements and integral membrane proteins within 20 µm cryosections of fixed rat liver. Computer-aided 3D reconstruction of multi-spectral confocal microscope images was used to visualize the spatial relationships among the MT cytoskeleton, PM domains and intracellular organelles.

scholarly journals Brain capillary structures of schizophrenia cases and controls show a correlation with their neuron structures

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Rino Saiga ◽  
Masayuki Uesugi ◽  
Akihisa Takeuchi ◽  
Kentaro Uesugi ◽  
Yoshio Suzuki ◽  
...  
Keyword(s):  
Blood Vessels ◽  
Structural Parameters ◽  
Three Dimensional ◽  
Superior Temporal Gyrus ◽  
Anterior Cingulate ◽  
Dimensional Structure ◽  
Constant Diameter ◽  
The Mean ◽  
Cartesian Coordinate ◽  
Micrometer Scale

AbstractBrain blood vessels constitute a micrometer-scale vascular network responsible for supply of oxygen and nutrition. In this study, we analyzed cerebral tissues of the anterior cingulate cortex and superior temporal gyrus of schizophrenia cases and age/gender-matched controls by using synchrotron radiation microtomography or micro-CT in order to examine the three-dimensional structure of cerebral vessels. Over 1 m of cerebral blood vessels was traced to build Cartesian-coordinate models, which were then used for calculating structural parameters including the diameter and curvature of the vessels. The distribution of vessel outer diameters showed a peak at 7–9 μm, corresponding to the diameter of the capillaries. Mean curvatures of the capillary vessels showed a significant correlation to the mean curvatures of neurites, while the mean capillary diameter was almost constant, independent of the cases. Our previous studies indicated that the neurites of schizophrenia cases are thin and tortuous compared to controls. The curved capillaries with a constant diameter should occupy a nearly constant volume, while neurons suffering from neurite thinning should have reduced volumes, resulting in a volumetric imbalance between the neurons and the vessels. We suggest that the observed structural correlation between neurons and blood vessels is related to neurovascular abnormalities in schizophrenia.

scholarly journals Coupled Fluid–Solid Numerical Simulation for Flow Field Characteristics and Supporting Performance of Flexible Support Cylindrical Gas Film Seal

Aerospace ◽  
2021 ◽  
Vol 8 (4) ◽  
pp. 97
Author(s):  
Junfeng Sun ◽  
Meihong Liu ◽  
Zhen Xu ◽  
Taohong Liao ◽  
Xiangping Hu ◽  
...  
Keyword(s):  
Flow Field ◽  
Film Thickness ◽  
Fluid Dynamic ◽  
Structural Characteristics ◽  
Structural Parameters ◽  
Equivalent Stress ◽  
Three Dimensional ◽  
High Rotational Speed ◽  
Flexible Support ◽  
Flow Field Characteristics

A new type of cylindrical gas film seal (CGFS) with a flexible support is proposed according to the working characteristics of the fluid dynamic seal in high-rotational-speed fluid machinery, such as aero-engines and centrifuges. Compared with the CGFS without a flexible support, the CGFS with flexible support presents stronger radial floating characteristics since it absorbs vibration and reduces thermal deformation of the rotor system. Combined with the structural characteristics of a film seal, an analytical model of CGFS with a flexible wave foil is established. Based on the fluid-structure coupling analysis method, the three-dimensional flow field of a straight-groove CGFS model is simulated to study the effects of operating and structural parameters on the steady-state characteristics and the effects of gas film thickness, eccentricity, and the number of wave foils on the equivalent stress of the flexible support. Simulation results show that the film stiffness increases significantly when the depth of groove increases. When the gas film thickness increases, the average equivalent stress of the flexible support first decreases and then stabilizes. Furthermore, the number of wave foils affects the average foils thickness. Therefore, when selecting the number of wave foils, the support stiffness and buffer capacity should be considered simultaneously.

scholarly journals Automatized Evaluation of Students’ CAD Models

2021 ◽  
Vol 11 (4) ◽  
pp. 145
Author(s):  
Nenad Bojcetic ◽  
Filip Valjak ◽  
Dragan Zezelj ◽  
Tomislav Martinec
Keyword(s):  
Computer Aided Design ◽  
Three Dimensional ◽  
Computer Application ◽  
Test Cases ◽  
Cad Model ◽  
Computer Solution ◽  
3D Cad ◽  
Computer Aided ◽  
Cad Models ◽  
Aided Design

The article describes an attempt to address the automatized evaluation of student three-dimensional (3D) computer-aided design (CAD) models. The driving idea was conceptualized under the restraints of the COVID pandemic, driven by the problem of evaluating a large number of student 3D CAD models. The described computer solution can be implemented using any CAD computer application that supports customization. Test cases showed that the proposed solution was valid and could be used to evaluate many students’ 3D CAD models. The computer solution can also be used to help students to better understand how to create a 3D CAD model, thereby complying with the requirements of particular teachers.

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