Energy Correlation Coefficient in Wirelessly Powered Networks with Energy Beamforming

2021 ◽  
Author(s):  
Na Deng ◽  
Martin Haenggi
Keyword(s):  
Correlation Coefficient ◽  
Energy Correlation ◽  
Energy Beamforming

scholarly journals NUMERICAL SIMULATION OF INITIAL PRESSURE EFFECT ON ENERGY INPUT IN SPARK DISCHARGE IN NITROGEN

2019 ◽  
Author(s):  
K.V. Korytchenko ◽  
R.S. Tomashevskyi ◽  
I.S. Varshamova ◽  
D.P. Dubinin ◽  
A.A. Lisnyak ◽  
...  
Keyword(s):  
Correlation Coefficient ◽  
Energy Input ◽  
Energy Deposition ◽  
Pressure Effect ◽  
Initial Pressure ◽  
Spark Discharge ◽  
Atmospheric Conditions ◽  
Energy Correlation ◽  
Average Value ◽  
Spark Channel

An influence of initial gas pressure on energy deposited by spark discharge in nitrogen during the spark channel expansion is evaluated. Influence of the pressure on efficiency of energy deposition and emitted energy in a discharge channel is simulated. Dependencies of dynamic of energy input and an energy correlation coefficient on the pressure are found out. It was suggested to use an average value of the correlation coefficient to model a load of spark channel by the any initial pressure when a spark load is formed by atmospheric conditions.

133Xe-DSPECT: Normalwerte von zerebraler Ruhedurchblutung und Reservekapazität

1987 ◽  
Vol 26 (05) ◽  
pp. 192-197 ◽  
Author(s):  
T. Kreisig ◽  
P. Schmiedek ◽  
G. Leinsinger ◽  
K. Einhäupl ◽  
E. Moser
Keyword(s):  
Blood Flow ◽  
Cerebral Blood Flow ◽  
Cerebrovascular Disease ◽  
Correlation Coefficient ◽  
Regional Cerebral Blood Flow ◽  
Regression Line ◽  
Reserve Capacity ◽  
Regional Cerebral Blood ◽  
Quantitative Measurements ◽  
Before And After

Using the 133Xe-DSPECT technique, quantitative measurements of regional cerebral blood flow (rCBF) were performed before and after provocation with acetazolamide (Diamox) i. v. in 32 patients without evidence of brain disease (normals). In 6 cases, additional studies were carried out to establish the time of maximal rCBF increase which was found to be approximately 15 min p. i. 1 g of Diamox increases the rCBF from 58 ±8 at rest to 73±5 ml/100 g/min. A Diamox dose of 2 g (9 cases) causes no further rCBF increase. After plotting the rCBF before provocation (rCBFR) and the Diamox-induced rCBF increase (reserve capacity, Δ rCBF) the regression line was Δ rCBF = −0,6 x rCBFR +50 (correlation coefficient: r = −0,77). In normals with relatively low rCBF values at rest, Diamox increases the reserve capacity much more than in normals with high rCBF values before provocation. It can be expected that this concept of measuring rCBF at rest and the reserve capacity will increase the sensitivity of distinguishing patients with reversible cerebrovascular disease (even bilateral) from normals.

Effect of Dipyridamole on Spontaneous Platelet Aggregation in Whole Blood Decreases with the Time After Venepuncture: Evidence for the Role of ADP

1987 ◽  
Vol 58 (02) ◽  
pp. 744-748 ◽  
Author(s):  
A R Saniabadi ◽  
G D O Lowe ◽  
J C Barbenel ◽  
C D Forbes
Keyword(s):  
Platelet Aggregation ◽  
Correlation Coefficient ◽  
Whole Blood ◽  
Blood Platelet ◽  
Inhibitory Effect ◽  
Time Interval ◽  
Adp Receptor ◽  
Spontaneous Platelet Aggregation

SummarySpontaneous platelet aggregation (SPA) was studied in human whole blood at 3, 5, 10, 20, 30, 40 and 60 minutes after venepuncture. Using a whole blood platelet counter, SPA was quantified by measuring the fall in single platelet count upon rollermixing aliquots of citrated blood at 37° C. The extent of SPA increased with the time after venepuncture, with a correlation coefficient of 0.819. The inhibitory effect of dipyridamole (Dipy) on SPA was studied: (a) 10 μM at each time interval; (b) 0.5-100 μM at 3 and 30 minutes and (c) 15 μM in combination with 100 μM adenosine, 8 μM 2-chloroadenosine (2ClAd, an ADP receptor blocker) and 50 μM aspirin. There was a rapid decrease in the inhibitory effect of Dipy with the time after venepuncture; the correlation coefficient was -0.533. At all the concentrations studied, Dipy was more effective at 3 minutes than at 30 minutes after venepuncture. A combination of Dipy with adenosine, 2ClAd or aspirin was a more effective inhibitor of SPA than either drug alone. However, when 15 μM Dipy and 10 μM Ad were added together, the inhibitory effect of Dipy was not increased significantly, suggesting that Dipy inhibits platelet aggregation independent of Ad. The increase in SPA with the time after venepuncture was abolished when blood was taken directly into the anticoagulant containing 5 μM 2ClAd. It is suggested that ADP released from the red blood cells is responsible for the increased platelet aggregability with the time after venepuncture and makes a serious contribution to the artifacts of in vitro platelet function studies.

Palmar Musculature: Does It Affect the Development of Carpal Tunnel Syndrome? A Pilot Study

2021 ◽  
Author(s):  
Trevor Simcox ◽  
Lauren Seo ◽  
Kevin Dunham ◽  
Shengnan Huang ◽  
Catherine Petchprapa ◽  
...  
Keyword(s):  
Carpal Tunnel Syndrome ◽  
Correlation Coefficient ◽  
Carpal Tunnel ◽  
Case Control Study ◽  
Anatomical Variation ◽  
Case Control ◽  
Transverse Carpal Ligament ◽  
Large Variability ◽  
Tunnel Syndrome ◽  
Control Study

Abstract Background The etiology of carpal tunnel syndrome (CTS) is multifactorial. Static mechanical characteristics of CTS have been described, but dynamic (muscular) parameters remain obscure. We believe that musculature overlying the transverse carpal ligament may have an effect on carpal tunnel pressure and may explain the prevalence of CTS in manual workers. Questions/Purposes To utilize magnetic resonance imaging (MRI) imaging to estimate the amount of muscle crossing the area of the carpal tunnel and to compare these MRI measurements in patients with and without documented CTS. Methods A case–control study of wrist MRI scans between January 1, 2018, and December 1, 2019, was performed. Patients with a diagnosis of CTS were matched by age and gender with controls without a diagnosis of CTS. Axial MRI cuts at the level of the hook of the hamate were used to measure the thenar and hypothenar muscle depth overlying the carpal tunnel. Muscle depth was quantified in millimeters at three points: midcapitate, capitate–hamate border, capitate–trapezoid border. Average depth was calculated by dividing the cross-sectional area (CSA) by the transverse carpal ligament width. Statistical analysis included Student's t-test, chi-square test, and Pearson's correlation coefficient calculation. Results A total of 21 cases and 21 controls met the inclusion criteria for the study. There were no significant differences in demographics between case and control groups. The location and depth of the musculature crossing the carpal tunnel were highly variable in all areas evaluated. A significantly positive correlation was found between proximal median nerve CSA and muscle depth in the capitate–hamate area (correlation coefficient = 0.375; p = 0.014). CSA was not significantly associated with chart documented CTS. Conclusions We found large variability in our measurements. This likely reflects true anatomical variation. The significance of our findings depends on the location of the muscles and the line of pull and their effect on the mechanics of the transverse carpal ligament. Future research will focus on refining measurement methodology and understanding the mechanical effect of the muscular structure and insertions on carpal tunnel pressure. Level of Evidence This is a Level 3, case–control study.

HARGA DIRI REMAJA DAN POLA ASUH ORANGTUA SEBAGAI FAKTOR PROTEKTIF IDE BUNUH DIRI

2019 ◽  
Vol 9 (3) ◽  
pp. 301-310
Author(s):  
Nirmala Fajar Pertiwi ◽  
Ice Yulia Wardani
Keyword(s):  
High School ◽  
Suicidal Ideation ◽  
Protective Factors ◽  
Correlation Coefficient ◽  
Parenting Style ◽  
Random Sampling ◽  
Protective Factor ◽  
Nursing Intervention ◽  
Self Esteem ◽  
Emotional Instability

Remaja yang tidak mampu menghadapi tekanan akan membawanya pada ketidakstabilan emosional dan cenderung melakukan berbagai perilaku berbahaya hingga bunuh diri. Bunuh diri memiliki faktor protektif berupa harga diri tinggi karena dapat memberikan kualitas psikologis positif. Faktor protektif ide bunuh diri lainnya yaitu pola asuh yang seimbang antara dimensi penerimaan dan pengendalian atau disebut pola asuh otoritatif. Penelitian ini bertujuan untuk mengetahui hubungan harga diri dan pola asuh orangtua dengan ide bunuh diri pada remaja SMA. Desain penelitian ini menggunakan deskriptif korelatif dan pendekatan secara chross-sectional. Penelitian ini memiliki responden sejumlah 322 remaja di SMA yang dipilih dengan teknik proportional random sampling. Terdapat hubungan yang kuat dan arah negatifantara harga diri dengan ide bunuh diri dengan koefisien korelasi -0,876, yang berarti bahwa semakin rendah harga diri yang dimiliki remaja maka semakin tinggi ide bunuh diri. Terdapat hubungan dengan kekuatan sedangdan arah negatif antara pola asuh orangtua dengan ide bunuh diri dengan koefisien korelasi -0,365, artinya apabila pola asuh orangtua mengarah pada otoritatif maka ide bunuh diri akan semakin rendah, dan sebaliknya apabila pola asuh orangtua mengarah pada otoritarian maka ide bunuh diri akan semakin tinggi. Penelitian ini diharapkan dapat meningkatkan intervensi keperawatan jiwa dalammengidentifikasi ide bunuh diri pada remaja, serta meningkatkan wawasan remaja dan guru terkait faktor protektif ide bunuh diri.   Kata kunci: faktor proteksi, harga diri,ide bunuh diri,dan pola asuh orangtua   SELF-SELF-PRICE AND PARENT'S PATTERN AS SELF-KILLING IDEAS PROTECTIVE FACTORS   ABSTRACT Teenagers who do not cope well under pressure will lead them to emotional instability and tend to perform a variety of malicious behavior or commit to suicide. Suicidial Ideation has protective factor such as high self esteem, because it can provide positive psychological qualities.Other protective factor is parenting style that contain balance between the dimensions of acceptance and control, also called authoritative. This study aims to determine the relationship of self-esteem and parenting Stylewith Suicidial Ideation in high school adolescents. This study used descriptive correlative and cross-sectional approach. This study has a number of 322 respondents, that are high school adolescents selected by proportional random sampling technique. There is strong relationshipwith negative directionbetween self-esteem with suicidal ideationand the correlation coefficient is -0,876, which means that the if adolescent’s self-esteem is lower so suicidal ideation will be higher. There is moderate relationshipwith negative direction between parenting style with suicidal ideation and the correlation coefficient is -0,365, which means that if parenting style is authoritative so suicidal ideation will be lower, and if parenting style is authoritarian so suicidal ideation will be higher.This study can be used to improve nursing intervention in identify suicidal ideation, and also to improve teenager’s and teacher’s knowledge about protective factors of suicidal ideation.   Keywords: parenting style, protective factor,self-esteem and suicidal ideation

An effective method for determining the retention and distribution of cellulose nanofibrils in paper handsheets by dye labeling

TAPPI Journal ◽  
2018 ◽  
Vol 17 (03) ◽  
pp. 157-164 ◽  
Author(s):  
Shengdan Wang ◽  
Wenhua Gao ◽  
Kefu Chen ◽  
Jinsong Zeng ◽  
Jun Xu ◽  
...  
Keyword(s):  
Correlation Coefficient ◽  
Congo Red ◽  
Kraft Pulp ◽  
Cellulose Nanofibrils ◽  
Standard Curve ◽  
Congo Red Dye ◽  
Mechanical Disintegration ◽  
Softwood Kraft Pulp ◽  
White Water ◽  
Red Dye

Cellulose nanofibrils (CNF) were prepared by cellulase in conjunction with mechanical disintegration from the bleached softwood kraft pulp and labelled by Congo red dye. The labelled CNF were used to investigate the retention and distribution of CNF in paper handsheets. The retention of the labelled CNF was obtained by measuring the absorbance of white water using an ultraviolet-visible spectrophotometer. The results showed that this method for measuring the retention was rapid, feasible, and sensitive, owing to the high correlation coefficient R2 (0.9993) of the standard curve. The labelled CNF showed even distribution in paper handsheets. The colorimetric values of paper handsheets were explored with a residual ink analyzer.

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