scholarly journals RASIO MODEL Vs30 BERDASARKAN DATA MIKROTREMOR DAN USGS DI KECAMATAN JETIS KABUPATEN BANTUL

2017 ◽  
Vol 6 (1) ◽  
pp. 49
Author(s):  
Nugroho Budi Wibowo
Keyword(s):  
Empirical Equations ◽  
Topographic Model ◽  
Ground Profile

Data Vs30 banyak digunakan dalam berbagai persamaan empiris. Data tersebut dapat diperoleh dari data mikrotremor dan model topografi USGS. Penelitian ini bertujuan untuk menghitung rasio antara Vs30 mikrotremor dan Vs30 USGS. Data yang digunakan sebanyak 11 titik pengukuran mikrotremor di Kecamatan Jetis dan model topografi yang diperoleh dari website USGS. Vs30 mikrotremor dihasilkan dari model ground profile dengan nilai misfit terendah. Hasil perhitungan menunjukkan Vs30 berdasarkan data mikrotremor di Kecamatan Jetis bervariasi dari 145,22 – 251,24 m/s. Vs30 USGS di Kecamatan Jetis bervariasi dari 243,07 – 384,35 m/s.  Rasio Vs30 mikrotremor dan Vs30 USGS bervariasi dari 0,49 – 0,97. Hal ini menunjukkan bahwa data Vs30 USGS tidak berbeda jauh dengan hasil Vs30 data mikrotremor.Kata kunci: Vs30, Mikrotremor, Ground Profile Vs30 data are widely used in various empirical equations. Vs30 data can be obtained from microtremor data and topographic model from USGS. This study aimed to calculate the ratio between Vs30 from microtremor and Vs30 from USGS. The study used 11 points of microtremor data in Jetis and topographic model was obtained from USGS website. Vs30 from microtremor were generated from ground profile models with the lowest misfit values. The calculations show that Vs30 based on microtremor data in Jetis ranged from 145.22 - 251.24 m/s. Vs30 from USGS in Jetis ranged from 243.07 - 384.35 m / s. Ratio of Vs30 from microtremor and Vs30 from USGS vary from 0.49 - 0.97. This value indicates that the Vs30 data from USGS does not vary much with Vs30 data from microtremor.Keywords:Vs30, Microtremor, Ground Profile

Substituent effects in 1,3-indanediones

1982 ◽  
Vol 47 (5) ◽  
pp. 1486-1493 ◽  
Author(s):  
Alexander Perjéssy
Keyword(s):  
Substituent Effects ◽  
Empirical Equations ◽  
Substituent Constants ◽  
Complex Structural

The carbonyl stretching frequencies correlate well with substituent constants in a series of 166 1,3-indanediones using improved and extended Seth-Paul-Van Duyse equation. Transmissive factors and group electronegativities have been used to find empirical equations for calculation of substituent constants of more complex structural fragments.

Viscosity, electrical conductivity and density of the system ammonium nitrate-dimethyl sulphoxide

1984 ◽  
Vol 49 (5) ◽  
pp. 1109-1115
Author(s):  
Jindřich Novák ◽  
Zdeněk Kodejš ◽  
Ivo Sláma
Keyword(s):  
Electrical Conductivity ◽  
Aqueous Solutions ◽  
Ammonium Nitrate ◽  
Transport Properties ◽  
Calcium Nitrate ◽  
Dimethyl Sulphoxide ◽  
Present System ◽  
Empirical Equations ◽  
Concentrated Solutions ◽  
Nitrate Solutions

The density, viscosity, and electrical conductivity of highly concentrated solutions of ammonium nitrate in dimethyl sulphoxide have been determined over the temperature range 10-60 °C and the concentration range 7-50 mol% of the salt. The variations in the quantities as a function of temperature and concentration have been correlated by empirical equations. A comparison is made between the transport properties for the present system, aqueous solutions of ammonium nitrate, and calcium nitrate solutions in dimethyl sulphoxide.

scholarly journals Energy dissipation efficiency as a new variable in the empirical correlation of total dissolved gas

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Jingying Lu ◽  
Xiaolong Cheng ◽  
Zhenhua Wang ◽  
Ran Li ◽  
Jingjie Feng ◽  
...  
Keyword(s):  
Energy Dissipation ◽  
Standard Error ◽  
Air Entrainment ◽  
Empirical Equations ◽  
Generation Process ◽  
Field Observations ◽  
Dissolved Gas ◽  
Total Dissolved Gas ◽  
Future Work ◽  
Hydropower Stations

AbstractTotal dissolved gas (TDG) supersaturation, which occurs during dam spilling, may result in fish bubble disease and mortality. Many studies have been conducted to identify the factors pertaining to TDG generation, such as the spilling discharge and tailwater depth. Additionally, the energy dissipation efficiency should be considered due to its effect on the air entrainment, which influences the TDG generation process. According to the TDG field observations of 49 cases at Dagangshan and Xiluodu hydropower stations, the TDG was positively related to the energy dissipation efficiency, tailwater depth and discharge per unit width. A correlation between the generated TDG level and these factors was established. The empirical equations proposed by the USACE were calibrated, and the TDG level estimation performance was compared with the established correlation for 25 spillage cases at seven other dams. Among the considered cases, the standard error of the TDG estimation considering the energy dissipation efficiency was 5.7%, and those for the correlations obtained using the USACE equations were 13.0% and 10.0%. The findings indicated that the energy dissipation efficiency considerably influenced the TDG level, and its consideration helped enhance the precision of the TDG estimation. Finally, the generality of this approach and future work were discussed.

scholarly journals A process-based method for predicting lateral erosion rates

2021 ◽  
Author(s):  
Myron van Damme
Keyword(s):  
Soil Mechanics ◽  
High Surface ◽  
Shear Stresses ◽  
Empirical Equations ◽  
Predictive Capability ◽  
Surface Shear ◽  
Erosion Rates ◽  
Material Texture ◽  
Empirical Coefficients ◽  
The Impact

AbstractAn accurate means of predicting erosion rates is essential to improve the predictive capability of breach models. During breach growth, erosion rates are often determined with empirical equations. The predictive capability of empirical equations is governed by the range for which they have been validated and the accuracy with which empirical coefficients can be established. Most empirical equations thereby do not account for the impact of material texture, moisture content, and compaction energy on the erosion rates. The method presented in this paper acknowledges the impact of these parameters by accounting for the process of dilation during erosion. The paper shows how, given high surface shear stresses, the erosion rate can be quantified by applying the principles of soil mechanics. Key is thereby to identify that stress balance situation for which the dilatency induced inflow gives a maximum averaged shear resistance. The effectiveness of the model in predicting erosion rates is indicated by means of three validation test cases. A sensitivity analysis of the method is also provided to show that the predictions lie within the range of inaccuracy of the input parameters.

Adapting empirical equations to Lake Kinneret data by using three calibration methods

2009 ◽  
Vol 220 (23) ◽  
pp. 3291-3300 ◽  
Author(s):  
Yael Gilboa ◽  
Eran Friedler ◽  
Gideon Gal
Keyword(s):  
Lake Kinneret ◽  
Empirical Equations ◽  
Calibration Methods
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