The Time Spent by the Wiener Process in a Narrow Tube before Leaving a Wide Tube

1993 ◽  
Vol 117 (2) ◽  
pp. 529
Author(s):  
Antonia Foldes ◽  
Madan L. Puri
Keyword(s):  
Wiener Process ◽  
Narrow Tube ◽  
Wide Tube

scholarly journals The time spent by the Wiener process in a narrow tube before leaving a wide tube

1993 ◽  
Vol 117 (2) ◽  
pp. 529-529
Author(s):  
Antónia Földes ◽  
Madan L. Puri
Keyword(s):  
Wiener Process ◽  
Narrow Tube ◽  
Wide Tube

The Site of Formation of Hypotonic Urine in the Nephridium of Lumbricus

1949 ◽  
Vol 26 (1) ◽  
pp. 65-75 ◽  
Author(s):  
J. A. RAMSAY
Keyword(s):  
Osmotic Pressure ◽  
Freezing Point ◽  
Freezing Point Depression ◽  
Narrow Tube ◽  
Wide Tube ◽  
Different Parts

1. Methods for the collection of samples of urine from different parts of the nephridium of Lumbricus are described. 2. The osmotic pressures of these samples have been measured by determination of freezing-point depression and have been compared with the osmotic pressure of the medium surrounding the nephridium. 3. The results of this comparison indicate that the ability to form hypotonic urine is certainly present in the wide tube, is possibly present in the middle tube and is probably not present in the narrow tube. 4. The analogy between the nephridium and the vertebrate nephron is discussed.

Forecasting based on spectral time series analysis: prediction of the Aurubis stock price

2020 ◽  
Vol 17 (4) ◽  
pp. 215-227
Author(s):  
Julia Babirath ◽  
Karel Malec ◽  
Rainer Schmitl ◽  
Kamil Maitah ◽  
Mansoor Maitah
Keyword(s):  
Time Series ◽  
Risk Management ◽  
Time Series Analysis ◽  
Wiener Process ◽  
Stock Price ◽  
Percentage Error ◽  
Portfolio Performance ◽  
Stock Price Prediction ◽  
Series Analysis ◽  
Augmented Dickey Fuller

The attempt to predict stock price movements has occupied investors ever since. Reliable forecasts are a basis for investment management, and improved forecasting results lead to enhanced portfolio performance and sound risk management. While forecasting using the Wiener process has received great attention in the literature, spectral time series analysis has been disregarded in this respect. The paper’s main objective is to evaluate whether spectral time series analysis can produce reliable forecasts of the Aurubis stock price. Aurubis poses a suitable candidate for an investor’s portfolio due to its sound economic and financial situation and the steady dividend policy. Additionally, reliable management contributes to making Aurubis an investment opportunity. To judge if the achieved forecast results can be considered satisfactory, they are compared against the simulation results of a Wiener process. After de-trending the time series using an Augmented Dickey-Fuller test, the residuals were compartmentalized into sine and cosine functions. The frequencies, amplitude, and phase were obtained using the Fast Fourier transform. The mean absolute percentage error measured the accuracy of the stock price prediction, and the results showed that the spectral analysis was able to deliver superior results when comparing the simulation using a Wiener process. Hence, spectral time series can enhance stock price forecasts and consequently improve risk management.

Algorithm for diagnosing fastenings of pipe with liquid

2007 ◽  
Vol 5 ◽  
pp. 96-100
Author(s):  
A.M. Akhtyamov ◽  
F.F. Safina
Keyword(s):  
Frequency Spectrum ◽  
Natural Frequencies ◽  
Algebraic Equations ◽  
Bending Vibrations ◽  
Narrow Tube

An algorithm is considered for diagnosing fastening of a narrow tube filled with a fluid by a spectrum of natural frequencies of its bending vibrations. The constructed algorithm, based on the solution of systems of algebraic equations, allows one to determine any pipe fastenings by 9 values from the frequency spectrum of its vibrations when the liquid is flowing through the pipe.

scholarly journals Hydrodynamics of narrow-tube fixed bed reactors filled with Raschig rings

2020 ◽  
Vol 5 ◽  
pp. 100057 ◽  
Author(s):  
E.M. Moghaddam ◽  
E.A. Foumeny ◽  
A.I. Stankiewicz ◽  
J.T. Padding
Keyword(s):  
Fixed Bed ◽  
Narrow Tube ◽  
Fixed Bed Reactors

Life Prediction of Residual Current Device Based on Wiener Process with GM (1, 1) Model

2021 ◽  
Author(s):  
Guojin Liu ◽  
Ze Wang ◽  
Xiang Li ◽  
Chenghao Yue ◽  
Wenhua Li
Keyword(s):  
Wiener Process ◽  
Life Prediction ◽  
Residual Current ◽  
Current Device

scholarly journals Accuracy Degradation Model and Residual Accuracy Life Prediction of CNC Machine Tools Based on Wiener Process

2021 ◽  
Vol 1043 (3) ◽  
pp. 032039
Author(s):  
Shilin Li ◽  
Yan Ran ◽  
Genbao Zhang ◽  
Dingfei Zhang
Keyword(s):  
Wiener Process ◽  
Machine Tools ◽  
Life Prediction ◽  
Cnc Machine Tools ◽  
Cnc Machine ◽  
Degradation Model
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