Search results for: S.C. Cheng

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chapter

A Note on Sufficiency in Coherent Models

D. Basu, S.C. Cheng

Selected Works in Probability and Statistics > Selected Works of Debabrata Basu > 343-354

Partly of an expository nature, this article brings together a number of notions related to sufficiency in an abstract measure theoretic setting. The notion of a coherent statistical model, as introduced by Hasegawa and Perlman [6], is studied in some details. A few results are generalized and their earlier proofs simplified. Among other things, it is shown that a coherent model can be connected in...

article

Flexible Fourier unit root test of unemployment for PIIGS countries

Shu-Ching Cheng, Tsung-pao Wu, Kuei-Chiu Lee, Tsangyao Chang, more

Economic Modelling > 2014 > 36 > Complete > 142-148

In this empirical study, we apply the flexible Fourier unit root test proposed by Enders and Lee (2012) to re-examine the hysteresis hypothesis of unemployment for PIIGS (Portugal, Ireland, Italy, Greece, and Spain) countries over the period from 1960 to 2011. We find that the Fourier unit root test has greater power than a linear method if the true data generating process of unemployment is a stationarity,...

article

221 Psychiatric Co-Morbidity Is Associated With Increased Risk of Surgery in Crohns Disease

A.N. Ananthakrishnan, V.S. Gainer, T. Cai, S.C. Cheng, more

Gastroenterology > 2013 > 144 > 5 Supplement 1 > S-48

article

Pattern of Recurrence of Lower Limb Varicose Veins Post EVLT: A Single Center Experience

C.S. Chong, B.C. Toh, V. Chiang, S.C. Cheng, more

Ultrasound in Medicine & Biology > 2011 > 37 > 8 Supplement > S159

article

Experimental study of inverted annular film boiling in a vertical tube cooled by R-134a

Meamer El Nakla, D.C. Groeneveld, S.C. Cheng

International Journal of Multiphase Flow > 2011 > 37 > 1 > 67-75

An experimental investigation of inverted annular film boiling heat transfer has been performed for vertical up-flow in a round tube. The experiments used R-134a coolant and covered a pressure range of 640–2390kPa (water equivalent range: 4000–14,000kPa) and a mass flux range of 500–4000kgm ⁻² s ⁻¹ (water equivalent range: 700–5700kgm ⁻² s ⁻¹ ). The inlet qualities...

article

Measuring Interdependency in Industrial Symbiosis Network with Financial Data

J.C. Sun, N.M. Wang, S.C. Cheng

Energy Procedia > 2011 > 5 > Complete > 1957-1967

Industrial chains exhibit strong interdependency within industrial symbiosis network. When analyzing the interdependency effect among industrial chains, however, financial index is often ignored. In this paper, we will mainly focus on measuring the long-term interdependency effect through historical simulation and cointegration tests with financial data. A large-scale coal-mining group is studied...

article

Low virological response and high relapse rates in hepatitis C genotype 1 patients with advanced fibrosis despite adequate therapeutic dosing

Wendy S.C. Cheng, Stuart K. Roberts, Geoffrey McCaughan, William Sievert, more

Journal of Hepatology > 2010 > 53 > 4 > 616-623

The impact of fibrosis stage on chronic hepatitis C virus (HCV) treatment response was explored in CHARIOT, a study of high dose peginterferon alfa-2a (PEG-IFNα-2a) induction therapy in treatment naïve genotype 1 infection.Eight hundred and ninety-six patients were randomised 1:1 to 360μg (n=448) or 180μg (n=448) PEG-IFNα-2a weekly with RBV 1000–1200mg/day for 12weeks followed by 36weeks of 180μg...

article

Diameter effect on critical heat flux

A. Tanase, S.C. Cheng, D.C. Groeneveld, J.Q. Shan

Nuclear Engineering and Design > 2009 > 239 > 2 > 289-294

The critical heat flux look-up table (CHF LUT) is widely used to predict CHF for various applications, including design and safety analysis of nuclear reactors. Using the CHF LUT for round tubes having inside diameters different from the reference 8mm involves conversion of CHF to 8mm. Different authors [Becker, K.M., 1965. An Analytical and Experimental Study of Burnout Conditions in Vertical Round...

article

Coordination and optical attenuation of TiO2–SiO2 glass by electron energy loss spectroscopy

S.C. Cheng

Journal of Non-Crystalline Solids > 2008 > 354 > 31 > 3735-3741

Electron energy loss spectroscopy (EELS) techniques have been applied to investigate both the coordination and optical attenuation of TiO ₂ –SiO ₂ glass. The coordination was determined from the electron energy loss near edge fine structure (ELNES) of Ti L _2,3 -edges, and the results show that Ti ions substitute for Si ions in the tetrahedral coordinated sites. The optical...

article

The 2006 CHF look-up table

D.C. Groeneveld, J.Q. Shan, A.Z. Vasić, L.K.H. Leung, more

Nuclear Engineering and Design > 2007 > 237 > 15-17 > 1909-1922

CHF look-up tables are used widely for the prediction of the critical heat flux (CHF). The CHF look-up table is basically a normalized data bank for a vertical 8mm water-cooled tube. The 2006 CHF look-up table is based on a database containing more than 30,000 data points and provides CHF values at 24 pressures, 20 mass fluxes, and 23 qualities, covering the full range of conditions of practical interest...

article

Use of EELS to study the absorption edge of fused silica

S.C. Cheng, S.L. Schiefelbein, L.A. Moore, M. Pierson-Stull, more

Journal of Non-Crystalline Solids > 2006 > 352 > 28-29 > 3140-3146

Electron energy loss spectroscopy (EELS) was used to study the absorption edge of various types of fused silica. The relationships between transmission (%T), fictive temperature (T _f ), band gap energy (E ₀ ), and slope of the Urbach tail (K) were investigated. The trends are in agreement with other published studies and provide initial validation of the new technique. The measured...

article

An experimental and analytical study of the effect of axial power profile on CHF

J. Yang, D.C. Groeneveld, L.K.H. Leung, S.C. Cheng, more

Nuclear Engineering and Design > 2006 > 236 > 13 > 1384-1395

The effect of axial heat flux distribution (AFD) on the critical heat flux (CHF) was investigated. CHF measurements were obtained with HFC-134a cooled vertical tubes having four non-uniform and one uniform AFD profiles. The HFC-134a test conditions covered a pressure range from 1.6 to 2.4MPa, a mass-flux range from 2.8 to 4.7Mgm ⁻² s ⁻¹ , and an inlet-quality range from −0.9 to 0....

article

Gas chromatography-mass spectrometric determination of total isothiocyanates in Chinese medicinal herbs

Martin M.F. Choi, Shaomin Shuang, H.Y. Lai, S.C. Cheng, more

Analytica Chimica Acta > 2004 > 516 > 1-2 > 155-163

A gas chromatography-mass spectrometric (GC-MS) method for the determination of total isothiocyanates (ITCs) has been developed based on the quantification of the cyclocondensation product, 1,3-benzodithiole-2-thione, between ITCs and 1,2-benzenedithiol. It was the first analytical application to be applied to the analysis of Chinese medicinal herbs including Laifuzi, Baijiezi, Tinglizi and Hancai,...

article

A look-up table for fully developed film-boiling heat transfer

D.C. Groeneveld, L.K.H. Leung, A.Z. Vasic’, Y.J. Guo, more

Nuclear Engineering and Design > 2003 > 225 > 1 > 83-97

An improved look-up table for film-boiling heat-transfer coefficients has been derived for steam-water flow inside vertical tubes. Compared to earlier versions of the look-up table, the following improvements were made:The database has been expanded significantly. The present database contains 77,234 film-boiling data points obtained from 36 sources.The upper limit of the thermodynamic quality range...

article

Effects of flow obstacles on film boiling heat transfer

S.W. Peng, R. Revellin, D.C. Groeneveld, A.Z. Vasic, more

Nuclear Engineering and Design > 2003 > 222 > 1 > 89-95

The effect of flow obstacles on film boiling heat transfer in a vertical upward tube is investigated experimentally using R134a as a coolant. The results show that flow obstacles enhance heat transfer downstream of the obstacle and promote rewetting to occur in this region. The rewetting zone is found to increase with a decrease in quality at the obstacle location, and with an increase in mass flux,...

article

Comparison of CHF measurements in horizontal and vertical tubes cooled with R-134a

I.L. Pioro, D.C. Groeneveld, L.K.H. Leung, S.S. Doerffer, more

International Journal of Heat and Mass Transfer > 2002 > 45 > 22 > 4435-4450

An experimental study of the critical heat flux (CHF) in horizontal and vertical tubes cooled with R-134a has been completed. The investigated ranges of flow parameters in R-134a were outlet pressures of 1.31, 1.67 and 2.03 MPa (8, 10 and 12 MPa in water-equivalent values), mass flux from 500 to 3000 kgm ^- ² s ^- ¹ (700-4300 kgm ^- ² s ^- ¹ in water-equivalent...

article

Effects of flow obstacles on the critical heat flux in a vertical tube cooled with upward flow of R-134a

I.L. Pioro, D.C. Groeneveld, S.S. Doerffer, Y. Guo, more

International Journal of Heat and Mass Transfer > 2002 > 45 > 22 > 4417-4433

This paper presents a summary of a 4-year investigation into the effect of flow obstacles on critical heat flux (CHF). The investigation was performed using a vertical 6.92 mm tube, cooled with R-134a. The tests covered a pressure range from 0.96 to 2.39 MPa, a mass flux range from 500 to 3000 kgm ^- ² s ^- ¹ , and an outlet (critical) quality range from -0.05 to +0.95. The following...

article

The electrochemical oxidation of alkaline copper cyanide solutions

S.C. Cheng, M. Gattrell, T. Guena, B. MacDougall

Electrochimica Acta > 2002 > 47 > 20 > 3245 - 3256

A systematic investigation of the electrochemical oxidation of copper cyanide was carried out. At low pH, cyanide destruction is believed to be catalyzed by the heterogeneous reaction involving adsorbed [Cu(CN) ₃ ] ² ^- and possibly [Cu(CN) ₄ ] ³ ^- . At high pH, rapid oxidation of cyanide was observed around 0.75 V versus Hg/HgO with the formation of a black...

article

Prediction of CHF enhancement due to flow obstacles

Y. Guo, D.C. Groeneveld, S.C. Cheng

International Journal of Heat and Mass Transfer > 2001 > 44 > 23 > 4557-4561

A semi-theoretical prediction method of CHF enhancement due to flow obstacles inserted in a flow channel was developed in this paper. Compared to the existing CHF enhancement equations, the present prediction model includes the effect of most of the important parameters and correctly represents the observed parametric and asymptotic trends. Good agreement has been found between the model predictions...

article

Comparison of CHF measurements in R-134a cooled tubes and the water CHF look-up table

I.L. Pioro, D.C. Groeneveld, S.C. Cheng, S. Doerffer, more

International Journal of Heat and Mass Transfer > 2001 > 44 > 1 > 73-88

An exhaustive experimental study of the critical heat flux (CHF) in R-134a-cooled tubes has been recently completed. The objective of this study was to provide a consistent set of CHF data to be used as a reference for future separate effect studies. The investigated range of flow parameters in R-134a was: outlet pressure 0.96-2.39 MPa (equivalent to 6-14 MPa in water), mass flux 500-3000 kg m ...

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INFONA - science communication portal

Search results for: S.C. Cheng

A Note on Sufficiency in Coherent Models

Flexible Fourier unit root test of unemployment for PIIGS countries

221 Psychiatric Co-Morbidity Is Associated With Increased Risk of Surgery in Crohns Disease

Pattern of Recurrence of Lower Limb Varicose Veins Post EVLT: A Single Center Experience

Experimental study of inverted annular film boiling in a vertical tube cooled by R-134a

Measuring Interdependency in Industrial Symbiosis Network with Financial Data

Low virological response and high relapse rates in hepatitis C genotype 1 patients with advanced fibrosis despite adequate therapeutic dosing

Diameter effect on critical heat flux

Coordination and optical attenuation of TiO2–SiO2 glass by electron energy loss spectroscopy

The 2006 CHF look-up table

Use of EELS to study the absorption edge of fused silica

An experimental and analytical study of the effect of axial power profile on CHF

Gas chromatography-mass spectrometric determination of total isothiocyanates in Chinese medicinal herbs

A look-up table for fully developed film-boiling heat transfer

Effects of flow obstacles on film boiling heat transfer

Comparison of CHF measurements in horizontal and vertical tubes cooled with R-134a

Effects of flow obstacles on the critical heat flux in a vertical tube cooled with upward flow of R-134a

The electrochemical oxidation of alkaline copper cyanide solutions

Prediction of CHF enhancement due to flow obstacles

Comparison of CHF measurements in R-134a cooled tubes and the water CHF look-up table

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