ОБ ИЗМЕНЕНИИ НАПОРА В ВЕРХНЕМ БЬЕФЕ ЩИТОВОГО ЗАТВОРА

2020 ◽  
pp. 4
Author(s):  
M.R. Baramykov
Keyword(s):  
Initial Flow ◽  
Total Range ◽  
Flow Head

В данной статье описывается явление, наблюдавшееся в опытах с щитовым затвором. При опускании щита в поток напор в верхнем бьефе резко возрастал вначале, а затем плавно изменялся. Общий диапазон опускания щита, при котором наблюдалось данное явление, равнялся 3,6-3,8 мм. Поэтому шаг опускания затвора составлял 1,1-1,3 мм. Начальный напор потока под щитом равнялся от 25 до 28 мм. В статье высказано предположение о причинах возникновения этого явления.This article describes the phenomenon observed in experiments with a shield shutter. When the shield was lowered into the flow, the upstream head sharply increased at the beginning, and then smoothly changed. The total range of the lowering of shield was 3.6-3.8 mm, at which this phenomenon was observed. Therefore, step of the lowering of shield was 1.1-1.3 mm. The initial flow head under the shield was 25 to 28 mm. The article suggested the causes of this phenomenon.

Platelet Adhesion in Polytetrafluoroethylene (PTFE) Vascular Grafts In Vivo and the Influence of Increased Intramuscular Pressure-An Experimental Model

1983 ◽  
Vol 50 (04) ◽  
pp. 881-884 ◽  
Author(s):  
J T Christenson ◽  
P Qvarfordt ◽  
S-E Strand ◽  
D Arvidsson ◽  
T Sjöberg ◽  
...  
Keyword(s):  
Blood Flow ◽  
Graft Failure ◽  
Small Diameter ◽  
Graft Material ◽  
Intramuscular Pressure ◽  
Initial Flow ◽  
Early Graft ◽  
Wick Technique ◽  
Early Graft Failure

SummaryThrombogenicity of graft material is involved in early graft failure in small diameter grafts. The frequently seen postoperative swelling of the leg after distal revascularization may cause an increased intramuscular pressure and early graft failure.Pairs of 4 mm polytetrafluoroethylene (PTFE) grafts were implanted. Autologous platelets were labeled with mIn-oxine. Platelet adhesiveness onto the grafts were analyzed from gamma camera images. Intramuscular pressures were measured with wick technique. Blood flow was measured. One graft served as control the other as test graft. Ninety minutes after declamping the i. m. pressure was increased in the test-leg to 30 mmHg, and later to 60 mmHg.In the control-graft platelet uptake increased to a maximum 60 min after declamping. Blood flow and i.m. pressure remained uneffected. The test-grafts were initially similar but when i.m. pressure was increased to 30 mmHg activity in the grafts increased significantly. Blood flow decreased with 12% of initial flow. When i. m. pressure was raised to 60 mmHg platelet uptake continued to increase.An increased intramuscular pressure of 30 mmHg or more significantly increase the amount of platelets adhering onto PTFE grafts, emphasizing the need for measuring intramuscular pressures after lower limb vascular revascularizations.

scholarly journals Double Closed-Loop Compound Control Strategy for Magnetic Liquid Double Suspension Bearing

Processes ◽  
2021 ◽  
Vol 9 (7) ◽  
pp. 1195
Author(s):  
Jianhua Zhao ◽  
Yongqiang Wang ◽  
Xuchao Ma ◽  
Sheng Li ◽  
Dianrong Gao ◽  
...  
Keyword(s):  
Control Strategy ◽  
Electromagnetic Force ◽  
Closed Loop ◽  
Static Characteristic ◽  
Magnetic Liquid ◽  
Initial Current ◽  
Electromagnetic System ◽  
Initial Flow ◽  
Hydrostatic Force ◽  
Position Feedback

As a new type of suspension bearing, the magnetic liquid double suspension bearing (MLDSB) is mainly supported by electromagnetic suspension and supplemented by hydrostatic support. At present, the MLDSB adopts the regulation strategy of “electromagnetic-position feedback closed-loop, hydrostatic constant-flow supply” (referred to as CFC mode). In the equilibrium position, the external load is carried by the electromagnetic system, and the hydrostatic system produces no supporting force. Thus, the carrying capacity and supporting stiffness of the MLDSB can be reduced. To solve this problem, the double closed-loop control strategy of “electromagnetic system-force feedback inner loop and hydrostatic-position feedback outer loop” (referred to as DCL mode) was proposed to improve the bearing performance and operation stability of the MLDSB. First, the mathematical models of CFC mode and DCL mode of the single DOF supporting system were established. Second, the real-time variation laws of rotor displacement, flow/hydrostatic force, and regulating current/electromagnetic force in the two control modes were plotted, compared, and analyzed. Finally, the influence law of initial current, flow, and controller parameters on the dynamic and static characteristic index were analyzed in detail. The results show that compared with that in CFC mode, the displacement in DCL mode is smaller, and the adjustment time is shorter. The hydrostatic force is equal to the electromagnetic force in DCL mode when the rotor returns to the balance position. Moreover, the system in DCL mode has better robustness, and the initial flow has a more obvious influence on the dynamic and static characteristic indexes. This study provides a theoretical basis for stable suspension control and the safe and reliable operation of the MLDSB.

Measuring Mobility of the Metacarpophalangeal Joints II, III, IV, and V in the Dorso-Volar Plane

1984 ◽  
Vol 13 (1) ◽  
pp. 15-20 ◽  
Author(s):  
C Wagner ◽  
D Drescher
Keyword(s):  
Healthy Subjects ◽  
Reliability And Validity ◽  
Repeated Measurements ◽  
Interrater Agreement ◽  
Range Of Movement ◽  
Men And Women ◽  
Examination Method ◽  
Total Range ◽  
Flexion And Extension

An electronic gravity goniometer was developed for determining the passive range of movement of the MCP joints II, III, IV, and V in the dorso-volar plane by the use of preset torques. Test–retest measurements on 23 healthy subjects between the ages of 18 and 57 demonstrated high intrarater and interrater agreement for determining the total range. In the determination of the amounts of flexion and extension the measurement of the flexion was less reliable. There was overall evidence of a declining tendency of reliability from MCP joint II to MCP joint V, probably caused by different reactions of the joints to repeated measurements. The higher total range of the MCP joints in women was principally caused by a higher range of extension. In the case of men and women the range of MCP joint V was noticeably greater than that of the other three joints. The mobility of the four MCP joints correlates relatively closely as a whole, however, in the case of the non-adjacent joints less closely than with the adjacent joints. Reliability and validity of the examination method were balanced against one another with regard to testing of the biomechanical pre-conditions for manual dexterity.

Measurement of the Total Range and Specific Energy Deposition of a Beam of Uranium Ions in Porous Carbon Targets

Atomic Energy ◽  
2004 ◽  
Vol 96 (4) ◽  
pp. 275-281 ◽  
Author(s):  
V. V. Vatulin ◽  
A. V. Kunin ◽  
A. A. Golubev ◽  
V. E. Luk'yashin ◽  
V. I. Turtikov ◽  
...  
Keyword(s):  
Specific Energy ◽  
Porous Carbon ◽  
Energy Deposition ◽  
Uranium Ions ◽  
Total Range

scholarly journals Initial flow cytometric evaluation of the Clearllab lymphoid screen

2017 ◽  
Vol 94 (5) ◽  
pp. 863-869 ◽  
Author(s):  
B.D. Hedley ◽  
G. Cheng ◽  
J. Luider ◽  
W. Kern ◽  
G. Lozanski ◽  
...  
Keyword(s):  
Initial Flow ◽  
Flow Cytometric ◽  
Flow Cytometric Evaluation

GIRD syndrome in male handball and volleyball players: Is the decrease of total range of motion the turning point to pathology?

2021 ◽  
pp. 1-8
Author(s):  
Jonas Schmalzl ◽  
Helen Walter ◽  
Wolfram Rothfischer ◽  
Sören Blaich ◽  
Christian Gerhardt ◽  
...  
Keyword(s):  
Range Of Motion ◽  
Internal Rotation ◽  
Turning Point ◽  
External Rotation ◽  
Constant Score ◽  
High Rate ◽  
Overhead Athletes ◽  
Glenohumeral Internal Rotation Deficit ◽  
Total Range ◽  
Volleyball Players

BACKGROUND: Adaptations in glenohumeral range of motion may affect overhead athletes and lead to shoulder pathologies. OBJECTIVE: The purpose of this study was to evaluate glenohumeral internal rotation deficit (GIRD) and postero-superior impingement among male handball and volleyball players and the relationship between these pathologies and training level (amateur vs. professional), position (attack vs. no attack), experience (> 5 years vs. < 5 years) and sports. METHODS: Sixty-seven handball players and 67 volleyball players with a mean age of 25 [± 5] years were included. The range of motion including external and internal rotation in 90∘ abduction of the dominant and non-dominant shoulder was measured of each examined athlete. Visual analogue scale, disabilities of the shoulder and hand score, constant score and subjective shoulder value were recorded. The athletes were examined for postero-superior impingement and abduction force was measured with an isokinetic dynamometer. RESULTS: Internal rotation was significantly lower and external rotation was significantly greater in the dominant arm for both sports. 72% presented with GIRD. GIRD was more prevalent in athletes active for > 5 years (odds ratio (OR) 3), in those training > 3 times per week (OR 1.4) and in handball players (OR 2.7). 24% presented with postero-superior impingement. Players active for > 5 years (OR 1.22), professionals (OR 1.14), volleyball players (OR 1.19), offensive players (OR 2.2) and athletes with GIRD > 10∘ (OR 1.5) showed a higher prevalence of postero-superior impingement. CONCLUSION: GIRD is a common phenomenon in handball and volleyball players. Offensive players are frequently suffering from postero-superior impingement. GIRD > 10∘ leads in nearly 75% of the athletes to a decrease of total range of motion and a high rate of postero-superior impingement. Thus, a decreased range of motion seems to be the turning point from adaptation to pathology. Therefore, regular controls of range of motion and countermeasures by means of stretching the posterior shoulder joint should be integrated in the training content.

PENGARUH KELAS IBU HAMIL TERHADAP PENGETAHUAN DAN SIKAP IBU TENTANG PEMERIKSAAN DAN PERAWATAN KEHAMILAN DI WILAYAH KERJA PUSKESMAS BATAM TAHUN 2016

2016 ◽  
Vol 1 (2) ◽  
pp. 61-70
Author(s):  
R.Oktaviance Simorangkir ◽  
Lilis Sumardiani
Keyword(s):  
Pregnant Women ◽  
Health Workers ◽  
Community Health Center ◽  
Average Score ◽  
Maternal Knowledge ◽  
Class Effect ◽  
Cross Sectional ◽  
Significance Level ◽  
Average Value ◽  
Total Range

In the Working Area of Pancur Batu Puskesmas class, pregnant women begin to be implemented in 2016, but still found the low knowledge of pregnant women about the ideal pregnancy examination and there are pregnant women who show unimportant attitude checking pregnancy to health workers. Goals : The purpose of this research is to know the influence of maternal class on pregnant mother's knowledge and attitude about pregnancy examination and treatment. Methods : The study used a quantitative method with cross sectional design. The population of 151 pregnant women in Pancur Batu Community Health Center and 132 of them (63 pregnant women who had attended pregnant mother class and 69 pregnant women who never attended maternal class) were used as samples. Data analysis using independent t test at significance level α = 0,05. Result : The results showed the total range of knowledge scores of mothers who had followed the class of pregnant women is 7-13 with an average value of 10.08 ± 1.82, while the total range of scores of mothers who never follow the pregnant women's class is 1-9 with an average value 4,97,1,94. There is a maternal class effect on maternal knowledge of examination and treatment of pregnancy (p <3,82. There is a maternal class effect on maternal attitudes about examination and treatment of pregnancy (p3.13, while the total range of maternal scores that never follow the class of pregnant women is 27-47 with an average value of 35 , 410.001). The total score of attitudes of mothers who have attended the class of pregnant women is 41-56 with an average score of 48.24 <0.001). Conclution : It is expected that the Health Office to schedule Pancur Batu Puskesmas to carry out pregnant women's classes regularly and carried out 2 periods a year. Pancur Batu Puskesmas is expected to maintain the quality of pregnant women's classes and counseling invites all pregnant women to follow the class of pregnant women.

The Cost-Benefit of Pulse-Oximeter Use in the Prehospital Environment

1999 ◽  
Vol 14 (4) ◽  
pp. 41-46 ◽  
Author(s):  
Andrew J. Macnab ◽  
Lark Susak ◽  
Faith A. Gagnon ◽  
Janet Alred ◽  
Charles Sun
Keyword(s):  
Oxygen Saturation ◽  
Pulse Oximetry ◽  
Flow Rate ◽  
Cost Savings ◽  
Cost Benefit ◽  
Standard Protocol ◽  
Clinical Value ◽  
Transport Time ◽  
Initial Flow ◽  
Flow Rates

AbstractIntroduction:Pulse-oximetry has proven clinical value in Emergency Departments and Intensive Care Units. In the prehospital environment, oxygen is given routinely in many situations. It was hypothesized that the use of pulse oximeters in the prehospital setting would provide a measurable cost-benefit by reducing the amount of oxygen used.Methods:This was a prospective study conducted at 12 ambulance stations (average transport times >20 minutes). Standard care protocols and paramedic assessments were used to determine which patients received oxygen and the initial flow rate used. Pulse-oximetry measurements (oxygen-saturation measured by pulse oximetry) were then taken. If oxygen-saturation measured by pulse oximetry fell below 92% or rose above 96% (except in patients with chest pain), oxygen (O2) flow rates were adjusted. Costs of oxygen use were calculated: volume that would have been used based on initial flow rate; and volume actually used based on actual flow rates and transport time.Methods:A total of 1,907 patients were recruited. Oximetry and complete data were obtained on 1,787 (94%). Of these, 1,329 (74%) received O2 by standard protocol: 389 (27.5%) had the O2 flow decreased; 52 had it discontinued. Eighty-seven patients (6%) not requiring O2 standard protocol were hypoxemic (oxygen-saturation measured by pulse oximetry < 92%) by oximetry, and 71 patients (5%) receiving oxygen required flow rate increases. Overall, O2 consumption was reduced by 26% resulting in a cost-savings of $0.20 / patient. Prehospital pulse-oximetry allows unncessary or excessive oxygen therapy to be avoided in up to 55% of patients transported by ambulance and can help to identify suboptimally oxygenated patients (11%).Conclusion:Rationalizing the O2 administration using pulse-oximetry reduced O2 consumption. Other health care savings likely would result from a reduced incidence of suboptimal oxygenation. Oxygen cost-saving justifies oximeter purchase for each ambulance annually where patient volume exceeds 1,750, less frequently for lower call volumes, or in those services where the mean transport time is less than the 23 minute average noted in this study.

Oceanic wave-balanced surface fronts and filaments

2013 ◽  
Vol 730 ◽  
pp. 464-490 ◽  
Author(s):  
James C. McWilliams ◽  
Baylor Fox-Kemper
Keyword(s):  
Mixed Layer ◽  
Stokes Drift ◽  
Surface Gravity Wave ◽  
Initial Flow ◽  
Coriolis Forces ◽  
Flow Perturbation ◽  
Front Shape ◽  
Oceanic Wave ◽  
Mixed Layers ◽  
Layer Deformation

AbstractA geostrophic, hydrostatic, frontal or filamentary flow adjusts conservatively to accommodate a surface gravity wave field with wave-averaged, Stokes-drift vortex and Coriolis forces in an altered balanced state. In this altered state, the wave-balanced perturbations have an opposite cross-front symmetry to the original geostrophic state; e.g. the along-front flow perturbation is odd-symmetric about the frontal centre while the geostrophic flow is even-symmetric. The adjustment tends to make the flow scale closer to the deformation radius, and it induces a cross-front shape displacement in the opposite direction to the overturning effects of wave-aligned down-front and up-front winds. The ageostrophic, non-hydrostatic, adjusted flow may differ from the initial flow substantially, with velocity and buoyancy perturbations that extend over a larger and deeper region than the initial front and Stokes drift. The largest effect occurs for fronts that are wider than the mixed layer deformation radius and that fill about two-thirds of a well-mixed surface layer, with the Stokes drift spanning only the shallowest part of the mixed layer. For even deeper mixed layers, and especially for thinner or absent mixed layers, the wave-balanced adjustments are not as large.

Sign in / Sign up

Export Citation Format

Share Document