On the quality and magnitude of mechanical stresses in the locomotor system during rapid movements

1985 ◽  
Vol 75 (3) ◽  
pp. 245-262
Author(s):  
H. Preuschoft
Keyword(s):  
Mechanical Stresses ◽  
Locomotor System

Human Platelets Exposed to Mechanical Stresses Express a Potent Lipoxygenase Product

1992 ◽  
Vol 68 (05) ◽  
pp. 589-594 ◽  
Author(s):  
Alon Margalit ◽  
Avinoam A Livne
Keyword(s):  
Regulatory Volume Decrease ◽  
Human Platelets ◽  
Mechanical Stresses ◽  
Arterial Stenosis ◽  
Platelet Suspension ◽  
Suspension Flows ◽  
Lipoxygenase Product ◽  
Pathological Conditions ◽  
K Permeability ◽  
Volume Decrease

SummaryHuman platelets exposed to hypotonicity undergo regulatory volume decrease (RVD), controlled by a potent, yet labile, lipoxygenase product (LP). LP is synthesized and excreted during RVD affecting selectively K+ permeability. LP is assayed by its capacity to reconstitute RVD when lipoxygenase is blocked. Centrifugation for preparing washed platelets (1,550 × g, 10 min) is sufficient to express LP activity, with declining potency in repeated centrifugations, indicating that it is not readily replenish-able. When platelet suspension flows in a vinyl tubing (1 mm i.d.), at physiological velocity, controlled at 90–254 cm/s, LP formation increases as a function of velocity but declines as result of increasing the tubing length. Stirring the platelets in an aggregometer cuvette for 30 s, yields no LP unless the stirring is intermittent. No associated platelet lysis or aggregation are observed following the mechanical stress applications. These results demonstrate that although mechanical stresses result in LP production, the mode of its application plays a major role. These results may indicate that LP is synthesized under pathological conditions and could be of relevance to platelets behavior related to arterial stenosis.

Role of Mechanical Stresses at Ion Implantation of CdHgTe Solid Solutions

2013 ◽  
Vol 58 (9) ◽  
pp. 872-880 ◽  
Author(s):  
Smirnov A.B. Smirnov A.B. ◽  
◽  
Lytvyn O.S. Lytvyn O.S. ◽  
Morozhenko V.A. Morozhenko V.A. ◽  
Savkina R.K. Savkina R.K. ◽  
...  
Keyword(s):  
Ion Implantation ◽  
Solid Solutions ◽  
Mechanical Stresses

On the method of ultrasonic control of mechanical stresses

2018 ◽  
Vol 84 (7) ◽  
pp. 62-66
Author(s):  
K. V. Kurashkin
Keyword(s):  
Elastic Wave ◽  
Orientation Distribution ◽  
Elastic Wave Velocity ◽  
Mechanical Stresses ◽  
Material Structure ◽  
Stress Determination ◽  
Welded Steel ◽  
Ultrasonic Control ◽  
Cubic Crystallites ◽  
Proportional Relationship

A method of ultrasonic control of the mechanical stresses which takes into account the heterogeneity of the material structure and does not require unloading of the structure or using reference samples is considered. The procedure is based on echo-method of measuring time of the bulk elastic wave propagation and determination of the relative values ν31 and ν32 related to the material structure and mechanical stresses. It is shown that stresses violate the linearity of the relationship observed between the parameters in the absence of the mechanical stresses in the rolled material. This effect formed a basis for developing a method of the deviator stress determination. The purpose of the study is to demonstrate the main advantages of the developed method against the known ultrasonic techniques used for evaluation of the mechanical stresses, give theoretical grounds to the effect which allows taking into account the heterogeneity of the material structure, and also to exemplify the procedure. An analytical expression is derived using bulk elastic wave velocity in an orthotropic material composed of cubic crystallites and an assumption on the existence of simple proportional relationship between the coefficients of the orientation distribution function in rolled metal. Presented results of the mathematical modeling confirm the experimentally observed linear dependence between the parameters ν31 and ν32 in the absence of mechanical stresses. The results of evaluating residual stresses in a welded steel plate are presented as an example of the applicability of the developed procedure. Data of ultrasonic technique and data of strain gage measurements are compared. The features of the described method of stress determination are marked and the applicability limits are specified.

Research of the Brillouin frequency shift damage dependence from mechanical stresses in an optical sensor

2019 ◽  
Vol 9 (5) ◽  
pp. 512-521
Author(s):  
Ruslan V. Aginey ◽  
◽  
Rustem R. Islamov ◽  
Alexander A. Godunov ◽  
◽  
...  
Keyword(s):  
Frequency Shift ◽  
Optical Sensor ◽  
Mechanical Stresses

Evaluation of the Resistance of Individual Si Die to Cracking

1998 ◽  
Author(s):  
R. Berriche ◽  
R.K. Lowry ◽  
M.I. Rosenfield
Keyword(s):  
Thermal Cycling ◽  
Hardness Test ◽  
Mechanical Stresses ◽  
Test Method ◽  
Processing Conditions ◽  
Micro Hardness ◽  
Test Methodology ◽  
Vickers Micro Hardness

Abstract The present work investigated the use of the Vickers micro-hardness test method to determine the resistance of individual die to cracking. The results are used as an indicator of resistance to failure under the thermal and mechanical stresses of packaging and subsequent thermal cycling. Indentation measurements on die back surfaces are used to determine how changes in wafer backside processing conditions affect cracks that form around impressions produced at different loads. Test methodology and results obtained at different processing conditions are discussed.

Effect of Therapy Using Aquatic Treadmill on the Functional Status of Patients with Knee Arthrosis

2020 ◽  
Vol 62 (1) ◽  
pp. 27-32 ◽  
Author(s):  
Agnieszka Maruszewska ◽  
Lech Panasiuk ◽  
Agnieszka Buczaj ◽  
Anna Pecyna
Keyword(s):  
Range Of Motion ◽  
Perceived Exertion ◽  
Treadmill Exercise ◽  
Exercise Programme ◽  
Locomotor System ◽  
Lequesne Index ◽  
Knee Arthrosis ◽  
Index Of Severity ◽  
And Function ◽  
Aquatic Treadmill

Introduction: Arthrosis is considered as a disease of the whole locomotor system, which may be prevented and treated at early stages. Gonarthrosis develops gradually within 10-15 years, interfering with daily activities and capability for work. Aquatic exercises are considered as a potentially effective therapeutic intervention in persons with knee arthrosis. Aim: Assessment of the effectiveness of a 4-week aquatic treadmill exercise programme, with respect to the measurement of pain, balance, function, and mobility. Materials and Methods: The study covered 15 patients with gonarthrosis, using a 4-week cycle of exercises. The results of measurements included a visual-analogue scale for assessing pain, Time Up and Go (TUG) for balance, 6-meter walk test for mobility and Lequesne index for function. The exercise protocol covered an aquatic treadmill using water jets to destabilize while standing, and achieve high ratings of perceived exertion during walking. Results: The comparison of results obtained by the patients after 20 interventions, with those obtained before therapy allowing the presumption that on the level of significance α= 0.05 there occurred statistically significant differences in the results of the tests performed (p<0.05). This concerned both pain complaints (VAS scale, Lequesne index of severity for arthrosis of the knee), as well as functional tests TUG, and measurement of the range of motion (p = 0.041-0.001). Conclusions: Based on the results of the study a decrease was observed in pain complaints, improvement of the range of motion in the joints, balance and function, after participation in a 4-week aquatic treadmill exercise programme, which contained the components of balance and endurance training.

The horse – the athlete with the ultimate locomotor system

2016 ◽  
pp. 26-30
Author(s):  
Amy Barstow ◽  
Renate Weller
Keyword(s):  
Locomotor System

Role of Vaitarana Basti in the management of Gridhrasi w.s.r. to Sciatica

2018 ◽  
Vol 3 (5) ◽  
Author(s):  
Dr. Suresh N. Hakkandi ◽  
Dr. Manjunath Akki ◽  
Dr. Bhavana KS
Keyword(s):  
Low Back Pain ◽  
Back Pain ◽  
Clinical Practice ◽  
Routine Activity ◽  
Daily Routine ◽  
Low Back ◽  
Common Condition ◽  
Locomotor System

Vata Vyadhi is one of the most prevailing health problems in our day today clinical practice, Gridhrasi is one among them. Gridhrasi is Shoola Pradhana Nanatmaja Vatavyadhi, affecting the locomotor system and disable from daily routine activity. Gridhrasi the name itself indicates the way of gait shown by the patient due to extreme pain i.e. like Gridhra or Vulture. Gridhrasi is a condition characterized by Ruk, Toda, Stambha, Spandana in Sphik Pradesha and radiates downwards to Kati, Prusta, Uru, Janu, Jangha and Pada. Gridhrasi can be compared with Sciatica. Pain is the chief cause of person to visit a doctor. Although low back pain is a common condition that affects as many as 80 to 90 percent of people during their lifetime. Gridhrasi can be cured by the help of Vaitarana Basti. Hence in the case study of male patient of age 30 yrs presenting with cardinal clinical sign and symptoms of Gridhrasi are Ruka, Toda and Muhu Spandana in the Sphika, Kati, Uru, Janu, Jangha and Pada in order and Sakthikshepanigraha that is restricted lifting of the leg.

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