scholarly journals A Mathematical Model of dP/dt Max for the Evaluation of the Dynamic Control of Heart Contractility in Septic Shock

2019 ◽  
Vol 66 (10) ◽  
pp. 2719-2727 ◽  
Author(s):  
Marta Carrara ◽  
Antoine Herpain ◽  
Giuseppe Baselli ◽  
Manuela Ferrario
Keyword(s):  
Mathematical Model ◽  
Septic Shock ◽  
Dynamic Control ◽  
Heart Contractility

Temperature Prediction at the Blow End of the Converter via Control Model

2014 ◽  
Vol 1025-1026 ◽  
pp. 298-301
Author(s):  
Alexandre Furtado Ferreira
Keyword(s):  
Mathematical Model ◽  
Dynamic Control ◽  
Control Model ◽  
Mass Balances ◽  
Temperature Prediction ◽  
Oxygen Blow ◽  
Model Based ◽  
Gas Control ◽  
Prediction Capability

In the present work, a technique and model for temperature prediction at the blow end are briefly discussed, along with their limitations and perspectives for application. As a result of this analysis, a mathematical model based in heat and mass balances has been developed with a view to evaluating the possibility of improving this prediction capability. The study here presented focuses the development of a semi-dynamic control model in the LD-KGC converter (Linz-Donawitz-Kawasaki Gas Control Converter). The control model enables one to predict the temperature of the blow end by solving both the energy and mass equations. The inputs to the control model are the load data of the LD-KGC converter at the blow beginning and the collected data by the lance to 89% of oxygen blow. The results obtained in the present work were compared to the data measured in steelmaking. The semi-dynamic control model results agree well with data for LD-KGC converters.

Study on the Dynamic Control Chart of Pumping Wells

2013 ◽  
Vol 734-737 ◽  
pp. 1276-1279
Author(s):  
Jing Guang Zhu
Keyword(s):  
Mathematical Model ◽  
Boundary Conditions ◽  
Water Content ◽  
Control Chart ◽  
Dynamic Control ◽  
Scientific Basis ◽  
Leak Rate ◽  
Pump Efficiency ◽  
Pumping Wells ◽  
The Mathematical Model

In order to improve the pump efficiency of pumping wells, by means of the basic formula of pump efficiency, the mathematical model and boundary conditions of dynamic control chart is obtained, and the pump efficiency of pumping wells is drawn. Analysis shown that the pump efficiency is sensitive to the water content and pump leak rate. The higher the water content is, the higher pump efficiency is. The pump efficiency will be reduced with the increasing of pump leak rate. The dynamic control chart of class II block of A oilfield is given in the paper. After taking the measures, the pump efficiency of pumping wells is obviously improved. The dynamic control chart drawn by this method can provide a scientific basis for improving the pump efficiency of pumping wells in oilfield.

Yarn Feeding Compensation Algorithm and Implementation for Needbar Transverse Shifting of Carpet Tufting Machine

2011 ◽  
Vol 179-180 ◽  
pp. 150-155 ◽  
Author(s):  
Guang Feng Chen ◽  
Wei Bin Wang ◽  
Hao Chun Sun ◽  
Qing Qing Li
Keyword(s):  
Mathematical Model ◽  
Dynamic Control ◽  
Length Change ◽  
Compensation Scheme ◽  
Compensation Algorithm ◽  
Result Show ◽  
Carpet Tufting Machine ◽  
Control Principle ◽  
The Mathematical Model ◽  
Test Result

The needle bar transverse shifting will likely form the stop mark liked gap on the tufted carpet. This paper proposed the yarn feeding compensation scheme and illustrate implement method in detail. Through analysis the change in yarn feeding path and loop pile forming of carpet tufting machine, construct the mathematical model of length change of yarn feeding in path and usage of loop pile forming while needle bar shifting. According to the mathematical model for yarn feeding compensation, calculate the additional yarn feeding requirement. Base on jacquard control principle, dynamic control the yarn feed actuator to drive the yarn feed roller to delivery additional length yarn, and produce loop pile with predefined pile height, Test result show the compensation is feasible.

scholarly journals Dynamic control of Hsf1 during heat shock by a chaperone switch and phosphorylation

eLife ◽  
2016 ◽  
Vol 5 ◽  
Author(s):  
Xu Zheng ◽  
Joanna Krakowiak ◽  
Nikit Patel ◽  
Ali Beyzavi ◽  
Jideofor Ezike ◽  
...  
Keyword(s):  
Mathematical Model ◽  
Heat Shock ◽  
Signaling Pathways ◽  
Molecular Chaperones ◽  
Stress Resistance ◽  
Dynamic Control ◽  
Protein Homeostasis ◽  
Unfolded Proteins ◽  
Cell Signaling Pathways ◽  
Chaperone Hsp70

Heat shock factor (Hsf1) regulates the expression of molecular chaperones to maintain protein homeostasis. Despite its central role in stress resistance, disease and aging, the mechanisms that control Hsf1 activity remain unresolved. Here we show that in budding yeast, Hsf1 basally associates with the chaperone Hsp70 and this association is transiently disrupted by heat shock, providing the first evidence that a chaperone repressor directly regulates Hsf1 activity. We develop and experimentally validate a mathematical model of Hsf1 activation by heat shock in which unfolded proteins compete with Hsf1 for binding to Hsp70. Surprisingly, we find that Hsf1 phosphorylation, previously thought to be required for activation, in fact only positively tunes Hsf1 and does so without affecting Hsp70 binding. Our work reveals two uncoupled forms of regulation - an ON/OFF chaperone switch and a tunable phosphorylation gain - that allow Hsf1 to flexibly integrate signals from the proteostasis network and cell signaling pathways.

scholarly journals Effect of norepinephrine challenge on cardiovascular determinants assessed using a mathematical model in septic shock: a physiological study

2021 ◽  
Vol 9 (7) ◽  
pp. 561-561
Author(s):  
Huaiwu He ◽  
Siyi Yuan ◽  
Yun Long ◽  
Dawei Liu ◽  
Xiang Zhou ◽  
...  
Keyword(s):  
Mathematical Model ◽  
Septic Shock ◽  
Physiological Study

A mathematical model of human heart including the effects of heart contractility varying with heart rate changes

2018 ◽  
Vol 75 ◽  
pp. 129-137
Author(s):  
Yawei Wang ◽  
Hongdai Sun ◽  
Jianan Wei ◽  
Xuesong Liu ◽  
Tianya Liu ◽  
...  
Keyword(s):  
Mathematical Model ◽  
Heart Rate ◽  
Human Heart ◽  
Heart Contractility

A Research on Impedance Control Based on ANN Inverse System for Robot Manipulator

2014 ◽  
Vol 687-691 ◽  
pp. 560-563 ◽  
Author(s):  
Zhen Yang ◽  
Wei Zhang ◽  
Shang Lin Yang ◽  
Fang Wang
Keyword(s):  
Mathematical Model ◽  
Robot Manipulator ◽  
Impedance Control ◽  
Dynamic Control ◽  
Difficult Problem ◽  
Inverse System ◽  
Outer Loop ◽  
And Control

Because of lacking the imprecise mathematical model is a difficult problem in the area of dynamic control for robot manipulator. In this paper, a novel scheme which can realize the decoupling for robot by ANN inverse system in the inner loop and control the position and force in the outer loop is presented. The method is studied in the environment of Matlab and is realized by a manipulator in Lab. Analyzed from the experiment result, this algorithm is very feasible and it provides a basis for the further research.

Research on Vehicle Height Dynamic Control

2013 ◽  
Vol 791-793 ◽  
pp. 672-675
Author(s):  
Hui Xin Song ◽  
Cui Fen Li ◽  
You Shan Hou ◽  
Chao Wang ◽  
Chun Ming Shao
Keyword(s):  
Mathematical Model ◽  
Ride Comfort ◽  
Dynamic Control ◽  
Pneumatic Suspension ◽  
The Mathematical Model

In order to achieve the target of control vehicle height in running state,we designed a control schematic of which practicability was analyzed. By using AMEsim software, we established the mathematical model of the charging and releasing oil to simulate the performance of a 1/4 vehicle with hydro-pneumatic suspension. From the result, we get the conclusion that charging and releasing oil in running state has tiny effect on ride comfort, and stability of the vehicles.

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