Chapter 3 Additional Load Considerations

2020 ◽  
pp. 69-84
Keyword(s):  
Additional Load

Evaluating hardness and the S-test

TAPPI Journal ◽  
2019 ◽  
Vol 18 (3) ◽  
pp. 161-169
Author(s):  
Doug Cash ◽  
Benjamin Frank
Keyword(s):  
North American ◽  
Test Method ◽  
Load Curve ◽  
Permanent Damage ◽  
Additional Load ◽  
The North ◽  
Complete Failure

The corrugated industry typically quantifies crush resistance using the Concora corrugated medium test (CMT) on fluted medium or flat crush on combined board. These tests compress the materials until the point of complete failure of the flutes. Combined board elastically resists crushing forces until a certain point, the hardness of the structure, while additional load causes permanent damage and deformation. This study investigates how hardness can be measured directly from a load curve collected during CMT (or flat crush) testing and how it varies throughout the North American paper supply. It also explores how hardness correlates with the values obtained from the newly developed S-test. This new test method deserves further study as a potentially more appropriate specification for crush resistance of corrugated medium.

ESTIMATION OF ADDITIONAL LOAD ON A SHIELD TUNNEL DUE TO GROUND SWELLING BY THE RECOVER OF GROUNDWATER LEVEL

2019 ◽  
Vol 75 (2) ◽  
pp. I_20-I_29
Author(s):  
Shigeaki OKA ◽  
Wei LI ◽  
Yoshihiro ITO ◽  
Shunsuke KANEKO ◽  
Jin SAITO ◽  
...  
Keyword(s):  
Groundwater Level ◽  
Shield Tunnel ◽  
Additional Load

Analyses of Gait and Jump Tasks in Female Obese Adolescents

2012 ◽  
Vol 24 (1) ◽  
pp. 26-33 ◽  
Author(s):  
Filipe Ricardo Pires de Carvalho ◽  
Ana Teresa da Conceição Figueira Martins ◽  
Ana Maria Miranda Botelho Teixeira
Keyword(s):  
Lower Extremity ◽  
Fat Mass ◽  
Normal Weight ◽  
Female Adolescents ◽  
Electromyographic Activity ◽  
Countermovement Jump ◽  
Weight Group ◽  
Normal Weight Group ◽  
Additional Load ◽  
Task Differences

In spite of the advances in knowledge on the multi–factorial nature of obesity, many questions related to the consequences of the disease continue to be unanswered. Several studies have reported biomechanic and kinematic adaptation and alterations in walking and in tasks of every day life, motivated by the additional load of fat mass in children and adults. The main objective of this study was to understand the effect of obesity in the electromyographic activity of four lower extremity muscles during three speeds of walking and during a countermovement jump (CMJ) in twenty two (9 obese and 13 normal weight) female adolescents aged 13. Although electromyographic differences were not observed between groups for normal, slow and fast speeds, data suggests that the preferred pace of the obese is less efficient than that of the normal weight group. In CMJ task, differences in the after–fall jump phase were observed. More studies are needed to explain if the few differences observed between groups are caused by the bigger amount of fat mass.

Additional load decreases movement time in the wrist but not in arm movements at ID 6

2012 ◽  
Vol 224 (2) ◽  
pp. 243-253 ◽  
Author(s):  
Stefan Panzer ◽  
Jason B. Boyle ◽  
Charles H. Shea
Keyword(s):  
Movement Time ◽  
Arm Movements ◽  
Additional Load

scholarly journals Characteristics of Standing Postural Control in Women under Additional Load

2020 ◽  
Vol 17 (2) ◽  
pp. 490
Author(s):  
Bożena Wojciechowska-Maszkowska ◽  
Dorota Borzucka
Keyword(s):  
Postural Control ◽  
Postural Stability ◽  
Postural Sway ◽  
Center Of Pressure ◽  
Stability Control ◽  
Standing Posture ◽  
Additional Load ◽  
Eyes Open ◽  
Heavy Loads ◽  
Load Conditions

The aim of this study was to evaluate the effect of additional load on postural-stability control in young women. To evaluate postural control in the 34 women in this study (mean age, 20.8 years), we measured postural sway (center of pressure, COP) in a neutral stance (with eyes open) in three trials of 30 s each. Three load conditions were used in the study: 0, 14, and 30 kg. In analysis, we used three COP parameters, variability (linear), mean sway velocity (linear), and entropy (nonlinear). Results suggested that a considerable load on a young woman’s body (approximately 48% of body weight) had significant influence on stability. Specifically, heavy loads triggered random movements, increased the dynamics of postural-stability control, and required more attention to control standing posture. The results of our study indicate that inferior postural control mainly results from insufficient experience in lifting such a load.

Remediation of PCB-Contaminated Sediments in Lake Järns Jon, Emän River System, Sweden

1993 ◽  
Vol 28 (8-9) ◽  
pp. 297-306 ◽  
Author(s):  
P. Gullbring ◽  
T. Hammar
Keyword(s):  
Primary Source ◽  
River System ◽  
Contaminated Sediments ◽  
Dredged Material ◽  
Analysis Program ◽  
Remedial Action ◽  
Additional Load ◽  
Protective Barrier ◽  
National Importance ◽  
Consulting Companies

Järnsjön, a lake in the Swedish river Emån, contains approx. 400 kg of PCB which is slowly leaching out from the sediments. An analysis program has shown that the Järnsjön sediments are the primary source for ongoing discharge of PCB to the river. Based on the current yearly discharge of 7 kg PCB, the sediments will cause problems during several decades. The Emän river is classified as a resource of national importance. Remediation of Järnsjön is necessary if continued damage is to be avoided. However, remedial activities in lake Järnsjön can lead to an additional load on Emån. Restrictions on such releases during remediation of Järnsjön will therefore be stringently applied. The feasibility of remediating Järnsjön, has been examined in a number of studies carried out by the Swedish EPA together with different universities, institutes and consulting companies. A primary alternative has been selected. This alternative includes vacuum dredging within a protective barrier of silt screens. Dredged material will be dewatered and disposed of in a special landfill. This remedial action is estimated to cost appr. 40 million Swedish kronor. (6 - 8 million dollars). The remediation has started and will be concluded in 1994.

scholarly journals The simulation model of the grapple loader operation

2019 ◽  
Vol 252 ◽  
pp. 05021
Author(s):  
Karol Tucki ◽  
Anna Bączyk ◽  
Remigiusz Mruk ◽  
Izabela Wielewska ◽  
Piotr Radziszewski
Keyword(s):  
Simulation Model ◽  
Shock Absorber ◽  
Operating Conditions ◽  
Real Object ◽  
Slight Reduction ◽  
The Real ◽  
Additional Load ◽  
Hydraulic Cylinders ◽  
Matlab Package

The main objective of the study was to develop a simulation model for the operation of the T-214 CYKLOP grapple loader using the MATLAB package. The created model allowed assessment of the behaviour of the real object in the operating conditions under variable loads and in the system overload. The simulation of the boom operation was carried out in four combinations: (1) at power take-off speed = 1000 rpm without load and (2) at 1000 kg load, (4) at power take-off speed = 540 rpm without load and (4) at 1000 kg load. The results show that the system works properly. The correct functioning of the system is evidenced by the fact that changes in force and acceleration occur on both pistons when only one of the cylinders is operating (the cylinder at rest acts as a shock absorber for the forces resulting from the inertia of the arms and the load). Apart from the increased forces on the pistons of the hydraulic cylinders, the additional load resulted in a slight reduction in acceleration values and an increase in the time needed to change the arm tilt angles.

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