Theoretical analysis on the dynamic compressive behavior of cellular solids with non-linear variation in cross-sectional area

2021 ◽  
pp. 103921
Author(s):  
Sri Datta Rapaka ◽  
Manoj Pandey ◽  
Ratna Kumar Annabattula
Keyword(s):  
Theoretical Analysis ◽  
Cross Sectional Area ◽  
Cellular Solids ◽  
Sectional Area ◽  
Linear Variation ◽  
Compressive Behavior ◽  
Cross Sectional ◽  
Non Linear

scholarly journals The Nonlinear Relationship Between Psoas Cross-sectional Area and BMI: A New Observation and Its Insights into Diabetes Remission After Roux-en-Y Gastric Bypass

2021 ◽  
Author(s):  
Shaobo Li ◽  
Haoyong Yu ◽  
Pin Zhang ◽  
Yinfang Tu ◽  
Yunfeng Xiao ◽  
...  
Keyword(s):  
Gastric Bypass ◽  
Linear Relationship ◽  
Muscle Mass ◽  
Diabetes Remission ◽  
Cross Sectional Area ◽  
Fat Free Mass ◽  
Sectional Area ◽  
Cross Sectional ◽  
Non Linear ◽  
Design And Methods

OBJECTIVE <p>To<a> explore the potential relevance of muscle mass as a variable contributor to body mass index (BMI) on BMI limitations in predicting diabetes remission (DR) after Roux-en-Y gastric bypass (RYGB). </a></p> <p> </p> <p>RESEARCH DESIGN AND METHODS</p> <p>We evaluated the relationship between muscle mass and BMI in 501 patients with type 2 diabetes mellitus and overweight or obesity. Of which <a>186 patients who underwent R</a>YGB were <a>studied to determine the role of baseline muscle mass </a><a>and BMI </a>in predicting DR. Muscle mass was assessed by estimated fat-free mass index (eFFMI) and psoas cross-sectional area (CSA).</p> <p> </p> <p>RESULTS</p> <p>A non-linear relationship existed between psoas CSA and BMI, whereas psoas CSA showed a highly positive correlation with <a>eFFMI</a>. Baseline psoas CSA and eFFMI were better than BMI for predicting 1- and 5-year DR. </p> <p> </p> <p>CONCLUSIONS</p> <p><a>The </a><a>non-linear relationship between</a> muscle mass and BMI may <a>partially contribute to </a><a>BMI limitations in predicting DR</a> after RYGB. </p>

scholarly journals The Nonlinear Relationship Between Psoas Cross-sectional Area and BMI: A New Observation and Its Insights into Diabetes Remission After Roux-en-Y Gastric Bypass

2021 ◽  
Author(s):  
Shaobo Li ◽  
Haoyong Yu ◽  
Pin Zhang ◽  
Yinfang Tu ◽  
Yunfeng Xiao ◽  
...  
Keyword(s):  
Gastric Bypass ◽  
Linear Relationship ◽  
Muscle Mass ◽  
Diabetes Remission ◽  
Cross Sectional Area ◽  
Fat Free Mass ◽  
Sectional Area ◽  
Cross Sectional ◽  
Non Linear ◽  
Design And Methods

OBJECTIVE <p>To<a> explore the potential relevance of muscle mass as a variable contributor to body mass index (BMI) on BMI limitations in predicting diabetes remission (DR) after Roux-en-Y gastric bypass (RYGB). </a></p> <p> </p> <p>RESEARCH DESIGN AND METHODS</p> <p>We evaluated the relationship between muscle mass and BMI in 501 patients with type 2 diabetes mellitus and overweight or obesity. Of which <a>186 patients who underwent R</a>YGB were <a>studied to determine the role of baseline muscle mass </a><a>and BMI </a>in predicting DR. Muscle mass was assessed by estimated fat-free mass index (eFFMI) and psoas cross-sectional area (CSA).</p> <p> </p> <p>RESULTS</p> <p>A non-linear relationship existed between psoas CSA and BMI, whereas psoas CSA showed a highly positive correlation with <a>eFFMI</a>. Baseline psoas CSA and eFFMI were better than BMI for predicting 1- and 5-year DR. </p> <p> </p> <p>CONCLUSIONS</p> <p><a>The </a><a>non-linear relationship between</a> muscle mass and BMI may <a>partially contribute to </a><a>BMI limitations in predicting DR</a> after RYGB. </p>

Relationship between axial motion and volume displacement of the diaphragm during VC maneuvers

1992 ◽  
Vol 72 (4) ◽  
pp. 1536-1540 ◽  
Author(s):  
J. A. Verschakelen ◽  
K. Deschepper ◽  
M. Demedts
Keyword(s):  
Theoretical Analysis ◽  
Linear Relationship ◽  
Vital Capacity ◽  
Cross Sectional Area ◽  
Sectional Area ◽  
Axial Motion ◽  
Cross Sectional ◽  
Good Linear ◽  
Good Linear Relationship ◽  
The Mean

During semistatic inspiratory and expiratory vital capacity (VC) maneuvers, axial motion of the diaphragm was measured by lateral fluoroscopy and was compared with diaphragmatic volume displacement. Axial motion was measured at the anterior, middle, and posterior parts of the diaphragm, and the mean of these measurements was used. The volume displacement was calculated in two ways: first, from respiratory inductive plethysmograph-(Respitrace) derived cross-sectional area changes of rib cage and abdomen (Vdi,RIP) by means of a theoretical analysis described by Mead and Loring (J. Appl. Physiol. 53: 750–755, 1982) and, second, from fluoroscopically measured changes in position and anteroposterior surface of the diaphragm (Vdi,F). A very good linear relationship was found between Vdi,RIP and Vdi,F during inspiration as well as expiration (r greater than 0.95), indicating that the analysis of Mead and Loring was valid in the conditions of the present study. The diaphragmatic volume displacement (active or passive) accounted for 50–60% of VC. A very good linear relationship was also found between mean axial motion and volume displacement of the diaphragm measured with both methods during inspiration and expiration (r greater than 0.98). Our data suggest that, over the VC range, diaphragmatic displacement functionally can be represented by a pistonlike model, although topographically and anatomically it does not behave as a piston.

Pelvic Canal Narrowing Caused by Triple Pelvic Osteotomy in the Dog

1994 ◽  
Vol 07 (03) ◽  
pp. 110-113 ◽  
Author(s):  
D. L. Holmberg ◽  
M. B. Hurtig ◽  
H. R. Sukhiani
Keyword(s):  
Postoperative Complications ◽  
Pelvic Osteotomy ◽  
Cross Sectional Area ◽  
Sectional Area ◽  
Cross Sectional ◽  
Canal Width ◽  
Operative Complications ◽  
Post Operative Complications

SummaryDuring a triple pelvic osteotomy, rotation of the free acetabular segment causes the pubic remnant on the acetabulum to rotate into the pelvic canal. The resulting narrowing may cause complications by impingement on the organs within the pelvic canal. Triple pelvic osteotomies were performed on ten cadaver pelves with pubic remnants equal to 0, 25, and 50% of the hemi-pubic length and angles of acetabular rotation of 20, 30, and 40 degrees. All combinations of pubic remnant lengths and angles of acetabular rotation caused a significant reduction in pelvic canal-width and cross-sectional area, when compared to the inact pelvis. Zero, 25, and 50% pubic remnants result in 15, 35, and 50% reductions in pelvic canal width respectively. Overrotation of the acetabulum should be avoided and the pubic remnant on the acetabular segment should be minimized to reduce postoperative complications due to pelvic canal narrowing.When performing triple pelvic osteotomies, the length of the pubic remnant on the acetabular segment and the angle of acetabular rotation both significantly narrow the pelvic canal. To reduce post-operative complications, due to narrowing of the pelvic canal, overrotation of the acetabulum should be avoided and the length of the pubic remnant should be minimized.

DETERMINATION OF THE FUNCTION OF THE ROD’S CROSS-SECTIONAL AREA USING VIBRATION EIGENFREQUENCIES

2020 ◽  
Vol 0 (4) ◽  
pp. 19-24
Author(s):  
I.M. UTYASHEV ◽  
◽  
A.A. AITBAEVA ◽  
A.A. YULMUKHAMETOV ◽  
◽  
...  
Keyword(s):  
Cross Sectional Area ◽  
Variable Cross ◽  
Sectional Area ◽  
Longitudinal Vibrations ◽  
Cross Sectional ◽  
Method Error ◽  
Various Boundary Conditions ◽  
Elastic Fixation ◽  
Crosssectional Area

The paper presents solutions to the direct and inverse problems on longitudinal vibrations of a rod with a variable cross-sectional area. The law of variation of the cross-sectional area is modeled as an exponential function of a polynomial of degree n . The method for reconstructing this function is based on representing the fundamental system of solutions of the direct problem in the form of a Maclaurin series in the variables x and λ. Examples of solutions for various section functions and various boundary conditions are given. It is shown that to recover n unknown coefficients of a polynomial, n eigenvalues are required, and the solution is dual. An unambiguous solution was obtained only for the case of elastic fixation at one of the rod’s ends. The numerical estimation of the method error was made using input data noise. It is shown that the error in finding the variable crosssectional area is less than 1% with the error in the eigenvalues of longitudinal vibrations not exceeding 0.0001.

Changes in the parameters of nasal breathing and parameters of the upper respiratory tract during orthognathic operations in patients with II and III skeletal class of jaw anomalies

2020 ◽  
pp. 22-27
Author(s):  
S.Sh. Gammadaeva ◽  
M.I. Misirkhanova ◽  
A.Yu. Drobyshev
Keyword(s):  
Respiratory Tract ◽  
Nasal Cavity ◽  
Nasal Septum ◽  
Cross Sectional Area ◽  
Upper Respiratory Tract ◽  
Sectional Area ◽  
Nasal Breathing ◽  
Cross Sectional ◽  
Skeletal Class ◽  
Upper Respiratory

The study analyzed the functional parameters of nasal breathing, linear parameters of the nasal aperture, nasal cavity and nasopharynx, volumetric parameters of the upper airways in patients with II and III skeletal class of jaw anomalies before and after orthognathic surgery. The respiratory function of the nose was assessed using a rhinomanometric complex. According to rhinoresistometry data, nasal resistance and hydraulic diameter were assessed. According to the data of acoustic rhinometry, the minimum cross-sectional area along the internal valve, the minimum cross-sectional area on the head of the inferior turbinate and nasal septum and related parameters were estimated. According to the CBCT data, the state of the nasal septum, the inferior turbinates, the nasal aperture, the state of the nasal cavity, and the linear values of the upper respiratory tract (nasopharynx) were analyzed. The patients were divided into 4 groups according to the classification of the patency of the nasal passages by

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