scholarly journals Oculomotor activity parameters of the operator in the P300 brain computer interface and similar stimulus situations

2015 ◽  
Vol 8 (4) ◽  
pp. 134-144
Author(s):  
I.A. Basyul
Keyword(s):  
Average Length ◽  
Brain Computer Interface ◽  
Computer Interface ◽  
Similar Stimulus ◽  
The Matrix ◽  
Relationship Of ◽  
The Relationship ◽  
Visual Fixations ◽  
Oculomotor Activity ◽  
Stimulus Environment

Hypotheses about the relationship of the processes of visual perception and variations of the task in an identical stimulus environment was tested. The following tasks were tested: 1) a simple observation of the illuminations of the character in the matrix; 2) counting the number of highlights; 3) monitoring of the target symbol highlights and typing text with the P300 BCI. In a group of 14 people showed that the highest average length of visual fixation and the lowest dispersion of fixation observed for the second type of task. Statistically significant differences in the level of dispersion of visual fixations found between 1-2 and 1-3 modes; differences between the modes for the duration of fixations are at trends. Significant differences in the number of visual fixations on the target symbols wasn’t detected. The overall conclusion is the high perspective of pairing methodology brain-computer interface on the P300 wave with eye tracking to optimize the characteristics of the stimulus in the BCI environment. The differences in the parameters of oculomotor activity between the tasks reflect the level of attention concentration in the target symbols of the P300 BCI

Hubungan berat lahir anak, rasio jenis kelamin anak, dan umur induk kerbau terhadap lama kebuntingan

2020 ◽  
Vol 9 (2) ◽  
pp. 35
Author(s):  
Yendraliza Yendraliza ◽  
Muhamad Rodiallah ◽  
Zumarni Zumarni
Keyword(s):  
Birth Weight ◽  
Standard Deviation ◽  
Sex Ratio ◽  
Artificial Insemination ◽  
Average Length ◽  
Positive Correlation ◽  
Relationship Of ◽  
The Relationship ◽  
Descriptive Method

This study was conducted to determine the relationship of birth weight of calves, sex ratio of the calves, and the age of the dam to the length of pregnancy in buffaloes resulting from artificial insemination in Kampar District. The method used in this research is the descriptive method by displaying the average and standard deviation. The total number of buffaloes that were artificially inseminated in 2018 and gave birth in 2019 was 21 buffalo-cows. Data were analyzed with the Pearson Product Moment (PPM) correlation. The parameters measured in this study were the length of pregnancy, calf birth weight, calf sex ratio, and dam’s age. The results showed a positive correlation between the birth weight of the calves, sex ratio of the calves, and the age of the dam to the length of pregnancy of 1.4%, with an average length of pregnancy, calf birth weight, and sex ratio of 351.81 days, 27.38 kg, and 1: 1 respectively.

scholarly journals Quaternion treatment of the relativistic wave equation

1937 ◽  
Vol 162 (909) ◽  
pp. 145-154 ◽  
Keyword(s):  
Wave Function ◽  
Wave Equation ◽  
Linear Functions ◽  
Relativistic Wave Equation ◽  
Relativistic Wave ◽  
Formal Representation ◽  
The Matrix ◽  
Scalar Products ◽  
Relationship Of ◽  
The Relationship

A set of matrices can be found which is isomorphic with any linear associative algebra. For the case of quaternions this was first shown by Cayley (1858), but the first formal representation was made by Peirce (1875, 1881). These were two-matrices, and the introduction of the four-row matrices of Dirac and Eddington necessitated the treatment of a wave function as a matrix of one row (as columns). Quaternions have been used by Lanczos (1929) to discuss a different form of wave equation, but here the Dirac form is discussed, the wave function being taken as a quaternion and the four-row matrices being linear functions of a quaternion. Certain advantages are claimed for quaternion methods. The absence of the distinction between outer and scalar products in the matrix notation necessitates special expedients (Eddington 1936). Every matrix is a very simple function of the fundamental Hamiltonian vectors α, β, γ , so that the result of combination is at once evident and depends only on the rules of combination of these vectors. At all stages the relationship of the different quantities to four-space is at once visible. The Dirac-Eddington matrices, the wave equation and its exact solution by Darwin, angular momentum operators, the general and Lorentz transformation, spinors and six-vectors, the current-density four-vector are treated in order to exhibit the working of this method. S and V for scalar and vector products are used. Quaternions are denoted by Clarendon type, and all vectors are in Greek letters.

Effect of Composition and Temperature on the Formation of Delta Ferrite in the Billet for P92 Steel

2011 ◽  
Vol 194-196 ◽  
pp. 1280-1286 ◽  
Author(s):  
He Min Jing ◽  
Bo Wang ◽  
Dang Sheng Xiong ◽  
Yin Geng Xu ◽  
Jun Jie Wang ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Strong Relationship ◽  
Delta Ferrite ◽  
P92 Steel ◽  
Heat Temperature ◽  
Three Samples ◽  
The Matrix ◽  
High Temperature Steam ◽  
Relationship Of ◽  
The Relationship

The use of P92 is becoming more and more widespread in high temperature steam pipe of super-ultracritical power station boilers, it’s key material for the manufacture of boiler’s four main pipes. The properties of P92 are closely related with its microstructure, and the microstructure of P92 has strong relationship with its’ composition and hot processing technology. Three types of P92 with different composition have been prepared. The relationship of delta ferrite between composition, smelting and heat forging process has been investigated for these three samples. The results show that the delta ferrite can be avoided by the adjustment of composition and making process, the delta ferrite will occurred in the matrix of P92 which without delta ferrite before heat treatment if the heat temperature exceed 1200°C , the delta ferrite existed in P92 ingot matrix resulted from the composition cannot be eliminated by hot working and heat treatment.

Role of MCP-1 in the development of tubulointerstitial fibrosis in patients with primary chronic glomerulonephritis

2021 ◽  
Vol 25 (5) ◽  
pp. 92-98
Author(s):  
A. V. Mukhtarova ◽  
M. M. Batyushin ◽  
Е. А. Sinelnik ◽  
N. V. Antipova
Keyword(s):  
Average Length ◽  
Critical Role ◽  
Albumin Level ◽  
Tubulointerstitial Fibrosis ◽  
Chronic Glomerulonephritis ◽  
Tubular Damage ◽  
Moderate Degree ◽  
Relationship Of ◽  
The Relationship

BACKGROUND. To date, the study of the factors involved in the glomerular-tubular pathological connections leading to damage to the tubulointerstitial tissue is one of the topical areas of nephrology. THE AIM: to study the effect of MCP-1 in the development of tubulointerstitial fibrosis as a factor in the irreversible progression of chronic renal failure. PATIENTS ANDMETHODS. Prospective observation and retrospective analysis of case histories were carried out, which included a total of 75 patients with primary chronic glomerulonephritis. RESULTS. The average age of the patients was 36.7 ± 12.3 years, of which 52 were males, 23 were women. The average length of service in a nephrological disease was 3.0 [1.0; 5.0] years. The calculated GFR values are 87.3 ± 31.2 ml / min / 1.73 m2. In the general population, the moderate degree of MCP-1 expression, estimated at 2 points, was 35 %, pronounced expression was found in 25 % of the respondents. In the mesangium of the glomeruli and in macrophages, the expressed degree of MCP-1 expression was 20 % and 16 %, respectively, which characterizes MCP-1 as a marker produced by resident cells. When studying the relationship of MCP-1 in blood with clinical parameters, a correlation was found with the values of total protein (Rs= –0.43; p <0.05), with erythrocyturia (Rs= –0.28; p <0.05), as well as with an albumin level (Rs= –0.5; p <0.05), which indicates the role of MCP-1 in the development of nephritic forms of glomerulonephritis. Depending on the severity of MCP-1 expression in biopsy specimens, the incidence of focal tubulointerstitial fibrosis with MCP-1 expression estimated at 1 point was 13.3 %, 2 points – 14.3 %, 3 points – 44.0 %. The revealed significant correlation between the serum level of MCP-1 and the severity of tubulointerstitial fibrosis confirms the MCP-1-mediated mechanism of progression of CKD. CONCLUSION. The relationship of serum and tissue forms of MCP-1 with the progression of tubulointerstitial fibrosis in chronic glomerulonephritis has been demonstrated. MCP-1-induced mesangial cell plays a critical role in the development of renal tubular damage, and its increased expression is associated with progressive tubulointerstitial fibrosis and decreased renal function.

Distribution, Age and Growth of Eastern Pacific Albacore (Thunnus alalunga Gmelin)

1955 ◽  
Vol 12 (1) ◽  
pp. 35-60 ◽  
Author(s):  
J. M. Partlo
Keyword(s):  
Average Length ◽  
Fork Length ◽  
Age And Growth ◽  
Frequency Distributions ◽  
Ring Number ◽  
Thunnus Alalunga ◽  
One Year ◽  
Relationship Of ◽  
The Relationship ◽  
Good Agreement

Seasonal and regional variations in the abundance of albacore during the 1949, 1950 and 1951 British Columbia fishing seasons suggest that exploitable stocks occurred in increasingly northerly areas during July and August and in more southerly areas during late August, September and early October. Catches were composed of four length-groups with average lengths of 54.3, 62.9, 71.7 and 81.9 centimetres. These groups were sometimes fairly discrete, but usually overlapped broadly, so that it was necessary to plot frequency distributions on probability paper in order to choose the best points of separation.Concentric marks on the centra of vertebrae were used as indicators of the age of the fish. The relationship of body length to vertebral radius is rectilinear. There is good agreement between the estimated average length and standard deviation in length of the fish when grouped by length and when grouped by vertebral ring number. The ages indicated for the four groups are III, IV, V and VI; however the first vertebral ring is somewhat less clear than the others and if it were discounted these ages would be reduced by one year. The fish whose vertebrae were examined had almost completed a year's growth.The length-weight relationship is expressed by the formula, log W = −4.912 + 3.13 log L, where W is the weight in kilograms and L is the fork length in centimetres.

Zero-field splitting calculations. Part II. Tabulation of the reduced matrix elements of the irreducible double tensor operators

1976 ◽  
Vol 54 (12) ◽  
pp. 1228-1233 ◽  
Author(s):  
R. Chatterjee ◽  
M. R. Smith ◽  
H. A. Buckmaster
Keyword(s):  
The Other ◽  
Tensor Operator ◽  
Zero Field ◽  
Matrix Elements ◽  
Zero Field Splitting ◽  
Field Splitting ◽  
The Matrix ◽  
The Many ◽  
Relationship Of ◽  
The Relationship

The many-electron reduced matrix elements of the double tensor operator [Formula: see text] are tabulated for the pn, dn and fn configurations. These tables have been calculated from the Racah formalism and form an extension of the tabulations given by Nielson and Koster for K2 = 1. The relationship of this tensor with the other double tensors and the calculation of the matrix elements is summarized. See Chatterjee et al for an application.

Address of the President Dr E. D. Adrian, O. M., at the Anniversary Meeting, 1 December 1952

1953 ◽  
Vol 140 (901) ◽  
pp. 443-453
Keyword(s):  
Wave Theory ◽  
Physical World ◽  
Negative Energy ◽  
Wave Mechanics ◽  
First Order ◽  
The Matrix ◽  
Relationship Of ◽  
The Relationship ◽  
Made In

The Copley Medal is awarded to Professor Paul Adrien Maurice Dirac for is remarkable contributions to the quantum theory of elementary particles and ectromagnetic fields. All his work has a very distinctive quality, in that he has Shown how to make evident the relationship of the remote abstractions of the mathematician to the extremely practical problems facing the atomic Phyysicist. This appeared even in his earliest work, for in 1926 he took up the commutative algebra of Heisenberg, and solved the problem of a non- planetary orbit. Not long afterwards he showed how the ‘matrix’ of Heisenberg could be identified with the ‘wave mechanics’ of Schrödinger. It is this paper, with its development of the idea of ‘representations’ physical states, that more than any other has given the colour of his work. The advances made in 1927 had not provided a relativistically invariant for the electron, nor had they explained the phenomenon of ‘electron’. In 1928 he remedied both of these defects at the same time. Perhaps the quality of this work was that it replaced the second order of equations, universal in wave-theory, by equations of the first order. These equa- had some astonishing consequences, such as possible states of negative energy; and Dirac attempted a physical interpretation of these states by Le concept of a background of electrons occupying nearly all such states. An state appeared in the physical world to be a particle of electronic and positive charge, equal in magnitude to that of the electron. The ‘positive electron’ or ‘positron’ was actually only discovered several years later and it into Dirac’s scheme.

scholarly journals Enter the Matrix: What the new brain-computer interfaces teach us about agency, privacy, and human subjectivity

2021 ◽  
Vol 6 (2) ◽  
Author(s):  
Benjamin Dueck
Keyword(s):  
Public Discourse ◽  
Brain Computer Interface ◽  
Popular Media ◽  
Computer Interface ◽  
Computer Interfaces ◽  
The Social ◽  
The Matrix ◽  
Economic Trends ◽  
Global Brain ◽  
And Control

Within the last decade, the global brain-computer interface (BCI) industry has experienced significant economic growth and captured the public’s imagination through enthusiastic coverage in the popular media. Responding dialectically to this growing public discourse, this paper overviews the social, ethical, and philosophical aspects of BCIs that pose the greatest concern for information policymakers. By reading the industry’s techno-economic trends against contemporary critical philosophy, I argue that these technologies enable new “posthuman” forms of surveillance and control that challenge democratic notions of freedom, privacy, and equality.

scholarly journals NEW OBSERVATIONS ON FLAGELLAR FINE STRUCTURE

1970 ◽  
Vol 47 (1) ◽  
pp. 159-182 ◽  
Author(s):  
Fred D. Warner
Keyword(s):  
Double Helix ◽  
Microtubule Organization ◽  
Sarcophaga Bullata ◽  
The Matrix ◽  
Matrix Region ◽  
Cilia And Flagella ◽  
Relationship Of ◽  
The Relationship ◽  
Tubule Wall ◽  
Similar Organization

The sperm flagella of the blowfly Sarcophaga bullata demonstrate the relationship of radial projections in the matrix region to the microtubule organization of the axoneme. The A microtubule of each peripheral doublet is connected to the central sheath by a series of paired radial links. The links lie along the tubule wall with a alternate spacing of about 320/560 A. The distal end of each link is enlarged into a globular head that connects via a transitional link to the helical sheath around the central microtubules. The radial link pairs are disposed in the form of a double helix with a pitch of about 1760 A. It is proposed that a similar organization is common to all cilia and flagella showing ninefold symmetry and must provide, in part, the morphological basis for motility.

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