slice method
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2022 ◽  
Vol 355 ◽  
pp. 01005
Author(s):  
Xiao Wu ◽  
Yang Luo ◽  
Qinmin Li ◽  
Juanjuan Shi

Time-varying mesh stiffness (TVMS) of gear plays vital role in analysing dynamic characteristic of gear transmission. So accurately evaluating the TVMS is important and essential. In this paper, a revised method to calculate the TVMS of helical gear is proposed. Based on slice method, the helical gear is sliced into pieces along the tooth width direction. The proposed method corrects the fillet foundation stiffness within multi-tooth in contact and considers the non-linearity and load-dependence of the Hertzian contact stiffness. The effect of the axial mesh force is considered. Finally, an equivalent helical gear model is established in ANSYS to study the mesh stiffness. The results show the proposed method has high effectiveness compared with FEM (finite element method).


2021 ◽  
Author(s):  
Wu Hongyan ◽  
Yang Ning ◽  
Chen Hui ◽  
Liang Weibin ◽  
Bilal Ahmad

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Amir Seginer ◽  
Edna Furman-Haran ◽  
Ilan Goldberg ◽  
Rita Schmidt

AbstractUltra-high-field functional magnetic resonance imaging (fMRI) offers a way to new insights while increasing the spatial and temporal resolution. However, a crucial concern in 7T human MRI is the increase in power deposition, supervised through the specific absorption rate (SAR). The SAR limitation can restrict the brain coverage or the minimal repetition time of fMRI experiments. In the majority of today’s studies fMRI relies on the well-known gradient-echo echo-planar imaging (GRE-EPI) sequence, which offers ultrafast acquisition. Commonly, the GRE-EPI sequence comprises two pulses: fat suppression and excitation. This work provides the means for a significant reduction in the SAR by circumventing the fat-suppression pulse. Without this fat-suppression, however, lipid signal can result in artifacts due to the chemical shift between the lipid and water signals. Our approach exploits a reconstruction similar to the simultaneous-multi-slice method to separate the lipid and water images, thus avoiding undesired lipid artifacts in brain images. The lipid-water separation is based on the known spatial shift of the lipid signal, which can be detected by the multi-channel coils sensitivity profiles. Our study shows robust human imaging, offering greater flexibility to reduce the SAR, shorten the repetition time or increase the volume coverage with substantial benefit for brain functional studies.


2021 ◽  
Vol 1 (1) ◽  
pp. 1-12
Author(s):  
Tommy Andreant ◽  
Lusmeilia Afriani ◽  
Ofik Taufik Purwadi ◽  
Andius D. Saputra

Analysis using depression line method was conducted in two conditions, at normal water level (± 124 m) with a result of 1.11 × 10-3 m3/s and at flood water level ± 126.5 m with result 1.33 × 10-3 m3/s. Capacity shows (< 1%) the average enters the reservoir, making it safe from the danger of distress. Safety calculations for pipping showed a bigger value than the filtration flow speed indication at the average value of 4,638 ( > 4) which means that dam will not make pipping symptoms. Analysis conducted on the slope of the dam using slice method without entering the value of seismic coefficient obtained a safe number result in all loading conditions and the analysis by adding a seismic coefficient get a safe result except in two conditions, at elevation ± 126.5 m is  SF 1.05 and at elevation ± 124 m SF is 1.05.


Author(s):  
Masataka Ohashi ◽  
Fumio Hosokawa ◽  
Takao Shinkawa ◽  
Kenji Iwasaki

This work describes the GRIPS automated particle-picking software for cryogenic electron microscopy and the evaluation of this software using elbis, a high-precision transmission electron microscope (TEM) image simulator. The goal was to develop a method that can pick particles under a small defocus condition where the particles are not clearly visible or under a condition where the particles are exhibiting preferred orientation. The proposed method handles these issues by repeatedly performing three processes, namely extraction, two-dimensional classification and positioning, and by introducing mask processing to exclude areas with particles that have already been picked. TEM images for evaluation were generated with a high-precision TEM image simulator. TEM images containing both particles and amorphous ice were simulated by randomly placing O atoms in the specimen. The experimental results indicate that the proposed method can be used to pick particles correctly under a relatively small defocus condition. Moreover, the results show that the mask processing introduced in the proposed method is valid for particles exhibiting preferred orientation. It is further shown that the proposed method is applicable to data collected from real samples.


2021 ◽  
Vol 12 ◽  
Author(s):  
Nora A. Murphy ◽  
Judith A. Hall

Thin slices are used across a wide array of research domains to observe, measure, and predict human behavior. This article reviews the thin-slice method as a measurement technique and summarizes current comparative thin-slice research regarding the reliability and validity of thin slices to represent behavior or social constructs. We outline decision factors in using thin-slice behavioral coding and detail three avenues of thin-slice comparative research: (1) assessing whether thin slices can adequately approximate the total of the recorded behavior or be interchangeable with each other (representativeness); (2) assessing how well thin slices can predict variables that are different from the behavior measured in the slice (predictive validity), and (3) assessing how interpersonal judgment accuracy can depend on the length of the slice (accuracy-length validity). The aim of the review is to provide information researchers may use when designing and evaluating thin-slice behavioral measurement.


2021 ◽  
Vol 1026 ◽  
pp. 183-188
Author(s):  
Liu Yang ◽  
Liu Shuang

The research of fluid inclusion thin section is to understand the physical and chemical conditions (such as temperature, pressure, density, pH value, composition, etc.) of minerals, rocks and deposits, and to solve the genesis of rocks and deposits; in the process of production, gas inclusions or liquid inclusions should be produced at low temperature, otherwise the inclusions will be destroyed, especially quartz sandstone, weathered rock, mudstone and other minerals Therefore, when the film is made in a humid temperature environment, it is very easy to be deliquesced, especially for the rocks with developed cleavage and many cracks, after rough grinding after polishing, it is easy to produce warping edge, warping angle, bubbles, etc., thus causing the sample piece to deteriorate after polishing; therefore, a large number of pockmarks and cracks will be produced under the microscope. In this paper, starting from the applicable conditions of materials and technological methods, the practical problems of making materials and technological process in rock slice method are introduced in detail. Keywords Inclusion,Manufacturing, Grinding,Polishing,Filming


Water ◽  
2021 ◽  
Vol 13 (5) ◽  
pp. 700
Author(s):  
Qi Ge ◽  
Jingjing Zhang ◽  
Zhongxuan Chen ◽  
Jin Li

Hydrodynamic pressure is often a crucial factor in the evaluation of slope stability analysis, especially for many rainfall-triggered landslides. Nevertheless, hydrodynamic pressure is rarely considered in the traditional limit equilibrium slice method of slope stability analysis since effective and reliable hydrodynamic pressure data are often lacking in practice. Moreover, efficient methods to involve these data in slope stability analysis are an urgent need. To overcome these concerns, the flow velocity and direction system (FVDS) is employed to measure the groundwater flow velocity, which can be used to generate hydrodynamic pressure samples at different monitoring points. Based on these samples, the hydrodynamic pressure of each soil strip is estimated using artificial neural networks (ANNs). Afterward, an improved Bishop method that considers hydrodynamic pressure is proposed. The effectiveness and significance of the proposed method are illustrated with a case study, the Fanshantou landslide in Zhejiang Province, China. The safety factor before and after taking drainage countermeasures is also calculated and compared. The results indicate that hydrodynamic pressure plays an important role in the stability analysis of the Fanshantou landslide. Compared with the classical Bishop method, the improved method is shown to agree better with the actual deformation characteristics of the landslide.


Author(s):  
Yanjie Sun

The load on the top of a slope is an important cause of slope failure, and it is of great significance to study the relationship between the load and the stability of the slope. This paper uses elastic theory and Moore Coulomb's theory as transformation conditions to obtain the slope stability coefficient expression under slope top load based on the Swedish slice method. In view of the actual engineering, the corresponding slope model structure was established, and 5 sliding surfaces were set with the crack on the top of the slope as the shear outlet. According to the slope stability coefficient expression, the stability coefficient of the set sliding surface is solved. The result shows that the slope is unstable under the load. The judgment result is consistent with the GEO-STUDIO check calculation result. This method can provide reference for theory and engineering practice.


2021 ◽  
Vol 18 (1) ◽  
pp. 55-64
Author(s):  
Shiguo Xiao ◽  
Tingjun Chen

For traditional slice methods of limit equilibrium used to analyze slope stability, some hypothetical conditions on interslice force are generally introduced to solve the problem. In order to reduce the defect theoretically due to the related hypothesis, more rigorous constraints of interslice force are completely considered in light of static equilibrium conditions and energy dissipation principle of the interface between two adjacent slices. Without hypothesis of interslice force, the slope stability analysis is transformed consistently into a non-linear programming problem to be solved. So, a generally improved solution of slice method of limit equilibrium to slope stability is put forward. In particular, influence of the dilation angle of soil on slope stability can be involved in the method. The proposed method can be utilized for any slopes with arbitrary slip surfaces.


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