A Thermal Analysis of Hot Oiling

1991 ◽  
Vol 113 (3) ◽  
pp. 161-164 ◽  
Author(s):  
F. C. Arnold
Keyword(s):  
Thermal Analysis ◽  
Finite Difference ◽  
Field Studies ◽  
Formation Damage ◽  
Operating Parameters ◽  
Model Studies ◽  
Entire Depth ◽  
Using Data ◽  
Oil Injection ◽  
Effective Transmission

The injection of hot oil to clean the formation and tubing of accumulated paraffin has been used for many years in petroleum production. Although effective in freeing tubulars immobilized by paraffin deposits, formation damage has been attributed to hot oiling when the oil reaching the formation face is at a temperature below the paraffin cloud point. The differential equations describing hot oil injection through the casing-tubing annulus were solved using finite difference mathematics and the model was verified using data from field studies. Model studies indicated that rapid cooling of the injected fluid frequently results in fluid temperatures below geothermal in the lower reaches of wells of even moderate depth. Injection through centralized tubing provides a conduit for effective transmission of thermal energy along the entire depth of the tubing and to the formation face. Injection through tubing is modeled and verified by field experiment. A parametric study of operating parameters is included.

scholarly journals RESPONS AL JAM’IYATUL WASHLIYAH TERHADAP TERORISME

2017 ◽  
Vol 22 (1) ◽  
pp. 1
Author(s):  
Ja'far Ja'far
Keyword(s):  
Data Analysis ◽  
Field Studies ◽  
Data Sources ◽  
Islamic State ◽  
Data Display ◽  
Analysis Method ◽  
Suicide Bombings ◽  
Library Research ◽  
The Government ◽  
Using Data

Al Washliyah merupakan satu di antara banyak organisasi Islam yang menolak paham dan gerakan terorisme di Indonesia. Artikel ini mengkaji respons Al Washliyah terhadap terorisme. Kajian ini menarik dilakukan, sebab organisasi ini memiliki pengikut yang fanatik dan mengelola amal usaha yang banyak, tetapi masih relatif jarang diteliti oleh para peneliti. Kajian ini merupakan studi lapangan (library research) dimana sumber datanya diperoleh dari kegiatan wawancara dan studi dokumen. Data dianalisis dengan menggunakan metode analisis data menurut Miles dan Huberman: reduksi data, pemaparan data, dan penarikan kesimpulan. Didasari dengan teori Matusitz, Pranawati, dan Golose tentang doktrin terorisme dimana gerakan ini ingin mendirikan negara Islam, memaknai jihad sebagai perang, anti terhadap non-Muslim, dan melegalkan bom bunuh diri, kajian ini akan menelaah respons Al Washliyah terhadap empat persoalan tersebut. Kajian ini mengajukan temuan bahwa Al Washliyah menolak paham dan gerakan terorisme yang muncul dan berkembang di Indonesia, dan para ulamanya menilai bahwa kaum teroris telah salah dalam memahami ajaran Islam. Temuan kajian ini dapat berkontribusi bagi pemerintah dalam upaya menanggulangi gerakan terorisme di Indonesia. Al Washliyah is one of Islamic organizations that rejects the concept of terrorism in Indonesia. This article examines Al Washliyah's responses to terrorism. This study is interesting because this organization has fanatic followers and manages many business charities, but rarely investigated by researchers. This research is field studies where the data sources obtained from the interviews activities and document studies. Data were analyzed by using data analysis method according to Miles and Huberman: data reduction, data display, and conclusion. Based on the theory of Matusitz, Pranawati, and Golose about terrorism doctrine in which the program wants to establish an Islamic state, interpret jihad as war, anti to non-Muslims, and legalize suicide bombings, this study will examine the Al Washliyah's responses to those four issues. This study proposes that Al Washliyah rejects the concept of terrorism which appears and develops in Indonesia, and ulama consider that terrorists have misunderstood on Islamic concept. The findings of this study may contribute to the government in combating terrorism movement in Indonesia.

scholarly journals Modelling the Flow of Mass and Energy within a Snowpack for Hydrological Forecasting

1983 ◽  
Vol 4 ◽  
pp. 198-203 ◽  
Author(s):  
E. M. Morris
Keyword(s):  
Partial Differential Equations ◽  
Finite Difference ◽  
Finite Difference Method ◽  
Differential Equations ◽  
Difference Method ◽  
Snow Melt ◽  
Partial Differential ◽  
Hydrological Forecasting ◽  
Using Data

This paper describes a deterministic, distributed snow-melt model which has been developed for the Systeme Hydrologique Européen (SHE), The model is based on partial differential equations describing the flow of mass and energy through the snow. These equations are solved by an implicit, iterative finite-difference method. The behaviour of the model is investigated using data from a sub-Arctic site in Scotland.

scholarly journals Mechanical Fault Detection on Electrical Machine: Thermal Analysis of Small Brushed DC Motor with Faulty Bearing

2018 ◽  
Vol 225 ◽  
pp. 05012
Author(s):  
Abbas A. Wahab ◽  
N. Fatimah Abdullah ◽  
M.A.H. Rasid
Keyword(s):  
Thermal Analysis ◽  
Steady State ◽  
Direct Current ◽  
Dc Motor ◽  
Temperature Data ◽  
Electrical Machine ◽  
Financial Loss ◽  
Data Logger ◽  
Steady State Temperature ◽  
Using Data

Direct current motors (DC motor) are used in the small electric devices commonly. DC motor are cheap and easy to install, thus their popularity. Despite the popularity, faults occur which make diagnosis and detection of faults very important. It avoids financial loss and unexpected shutdown operation causes by these faults. This paper presents an analysis of temperature profile of the much famous small Brushed DC motor with a faulty bearing. The temperature data of healthy DC motor and DC motor with faulty bearing were measured by thermocouple and recorded using data logger in real time until steady state temperature, under different load. The analysis on the steady state temperature allow to conclude that bearing fault can clearly be recognised through characteristics temperature difference with a healthy motor.

scholarly journals A parameter model of gas exchange for the seasonal sea ice zone

Ocean Science ◽  
2014 ◽  
Vol 10 (1) ◽  
pp. 17-28 ◽  
Author(s):  
B. Loose ◽  
W. R. McGillis ◽  
D. Perovich ◽  
C. J. Zappa ◽  
P. Schlosser
Keyword(s):  
Boundary Layer ◽  
Gas Exchange ◽  
Sea Ice ◽  
Open Water ◽  
Field Studies ◽  
The Arctic ◽  
Gas Transfer ◽  
Transfer Velocity ◽  
Using Data ◽  
Effective Transfer

Abstract. Carbon budgets for the polar oceans require better constraint on air–sea gas exchange in the sea ice zone (SIZ). Here, we utilize advances in the theory of turbulence, mixing and air–sea flux in the ice–ocean boundary layer (IOBL) to formulate a simple model for gas exchange when the surface ocean is partially covered by sea ice. The gas transfer velocity (k) is related to shear-driven and convection-driven turbulence in the aqueous mass boundary layer, and to the mean-squared wave slope at the air–sea interface. We use the model to estimate k along the drift track of ice-tethered profilers (ITPs) in the Arctic. Individual estimates of daily-averaged k from ITP drifts ranged between 1.1 and 22 m d−1, and the fraction of open water (f) ranged from 0 to 0.83. Converted to area-weighted effective transfer velocities (keff), the minimum value of keff was 10−55 m d−1 near f = 0 with values exceeding keff = 5 m d−1 at f = 0.4. The model indicates that effects from shear and convection in the sea ice zone contribute an additional 40% to the magnitude of keff, beyond what would be predicted from an estimate of keff based solely upon a wind speed parameterization. Although the ultimate scaling relationship for gas exchange in the sea ice zone will require validation in laboratory and field studies, the basic parameter model described here demonstrates that it is feasible to formulate estimates of k based upon properties of the IOBL using data sources that presently exist.

scholarly journals Measuring Environmental Sensitivity in Educational Contexts: A Validation Study With German-Speaking Students

2018 ◽  
Vol 8 (2) ◽  
pp. 17 ◽  
Author(s):  
Teresa Tillmann ◽  
Katharina El Matany ◽  
Heather Duttweiler
Keyword(s):  
Secondary School ◽  
Secondary School Students ◽  
Field Studies ◽  
Environmental Sensitivity ◽  
School Students ◽  
Academic Track ◽  
Individual Difference Variable ◽  
Highly Sensitive ◽  
German Speaking ◽  
Using Data

Sensory-Processing Sensitivity (SPS), as part of the general theory on Environmental Sensitivity (Pluess, 2015), is a temperamental individual difference variable, referring to sensitive perception and processing of as well as reflection upon environmental stimuli. For its measurement, Aron and Aron (1997) developed the Highly Sensitive Person Scale (HSP Scale) for application with adults. However, despite some adaption into German (Konrad & Herzberg, 2017) and a first English version for children (Pluess et al., 2018), no suitable measures of SPS for children exist in German. The presented two studies aimed at developing and validating a short, 10-item German version of the scale, which can be administered efficiently in educational field studies with German-speaking secondary school students. The factorial structure, its relationship with other personality traits (i.e., the Big Five; McCrae & Costa, 1990) and exploratory analyses on relationships with additional school-related variables were revealed using data from two independent student samples (N = 301 German academic-track secondary school students and N = 460 German vocational track secondary school students). Relations to existing research, practical implications for the educational context, and limitations of the studies are discussed.

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