Relevant bibliographies by topics / GSS coefficient

Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'GSS coefficient'

Author: Grafiati
Published: 4 June 2025
Last updated: 8 July 2025

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the lists of relevant articles, books, theses, conference reports, and other scholarly sources on the topic 'GSS coefficient.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Journal articles on the topic "GSS coefficient"

1

N., Shaheem, and A. V. Venugopalan. "Comparison between different radiological scoring systems in predicting post-PCNL outcome." International Surgery Journal 10, no. 10 (2023): 1606–15. http://dx.doi.org/10.18203/2349-2902.isj20232982.

Full text
Abstract:
Background: Various scoring systems, including Guy's stone score (GSS), S.T.O.N.E. score, and Clinical Research Office of the Endourological Society (CROES) nomogram, have been assessed for predicting post-percutaneous nephrolithotomy (PCNL) success in terms of stone-free status (SFS) and complications. Our study aims to determine the optimal predictor of SFS among these systems and assess their efficacy in predicting perioperative factors and complications, using modified Clavien grade. Methods: This prospective hospital-based cohort study involved 107 patients aged ≥18 years who underwent standard PCNL (tract size >24 Fr) within a year. GSS, S.T.O.N.E. score, and CROES nomogram were calculated using preoperative computed tomography (CT) scans. Comparisons between 'stone-free' and 'residual-stone' groups were statistically analyzed. Results: All parameters effectively predicted SFS. S.T.O.N.E. score exhibited excellent discriminatory power (AUC 0.844; 95% CI: 0.762-0.907), followed by GSS (AUC 0.756; 95% CI: 0.663-0.834) and CROES nomogram (AUC 0.749; 95% CI: 0.656-0.828). S.T.O.N.E. score, with an AUC of 0.844, proved the most accurate predictor at ≤7 cut-off. GUY's score correlated positively with operative time and hospital stay (correlation coefficient 0.403, 0.34). S.T.O.N.E. score also positively correlated with these factors (correlation coefficient 0.443, 0.37). CROES nomogram negatively correlated with operative time and hospital stay (correlation coefficient -0.374, -0.314). Conclusions: All scoring systems effectively predict post-PCNL SFS, with S.T.O.N.E. score being the most predictive. GSS and S.T.O.N.E. score associate significantly with operative time and hospital stay. Both GSS and S.T.O.N.E. score show significant associations with perioperative complications assessed by modified Clavien grade.
APA, Harvard, Vancouver, ISO, and other styles
2

Mo, Guowei, Yunxian Cui, Junwei Yin, and Pengfei Gao. "Influence of ZnO Film Deposition Parameters on Piezoelectric Properties and Film-to-Substrate Adhesion on a GH4169 Superalloy Steel Substrate." Micromachines 13, no. 4 (2022): 639. http://dx.doi.org/10.3390/mi13040639.

Full text
Abstract:
ZnO film is widely used in the field of health monitoring sensors, which has high requirements for the piezoelectric coefficient and film-to-substrate adhesion of the ZnO film. In this study, ZnO thin films were grown on a GH4169 superalloy steel (GSS) substrate using magnetron sputtering, and the effects of the sputtering power, argon–oxygen ratio, and sputtering pressure on the piezoelectric coefficient and film-to-substrate adhesion were studied. The composition, microstructure, and crystal orientation of ZnO thin films deposited under different process parameters were analyzed using X-ray diffraction (XRD), a scanning electron microscope (SEM), and an energy spectrum analyzer (EDS). The piezoelectric coefficient d33 was measured using a piezoelectric coefficient measuring instrument. The critical value of adhesion between the film and substrate was measured using the scratch method. The results demonstrated that the ZnO films had the most desirable properties when the sputtering power was 150 W, the argon–oxygen ratio was 25:10, and the sputtering pressure was 0.7 Pa. The XRD results showed that the ZnO film samples had the strongest (002) crystal orientation at 2θ = 34.4°; the SEM photos showed that the film samples were flat and uniform; and the EDS composition analysis results showed that the composition was close to the theoretical value. The maximum d33 coefficient value was 5.12 pC/N, and the maximum value of film-to-substrate adhesion between the ZnO films and GSS substrate was 4220 mN.
APA, Harvard, Vancouver, ISO, and other styles
3

Reinig, Bruce A., and Roberto J. Mejias. "On the Measurement of Participation Equality." International Journal of e-Collaboration 10, no. 4 (2014): 32–48. http://dx.doi.org/10.4018/ijec.2014100103.

Full text
Abstract:
Participation equality is often a key process construct in research models that examine the effects of group support systems (GSS) technology and e-collaboration. GSS are generally thought to reduce the dispersion of participation among team members and thus make participation more equally distributed. However, research conclusions in the literature regarding participation equality are not always consistent with this finding. Researchers have used a variety of approaches to operationalize participation equality including unit-based measures, such as the standard deviation, and dimensionless measures such as the Gini coefficient and the coefficient of variation. Researchers have also varied in their measurement of participation units with some counting phenomena such as comments, words, or remarks. The authors report on an exploratory study that demonstrates conditions in which research conclusions regarding the participation equality construct are dependent on both the participation unit analyzed and whether a unit-based or dimensionless measure is used to compute participation equality. The authors conclude with recommendations for researchers investigating participation equality and practitioners that seek to measure and track participation equality in their collaborative work practices.
APA, Harvard, Vancouver, ISO, and other styles
4

CHATTERJEE, PRASANTA, DEB KUMAR GHOSH, UDAY NARAYAN GHOSH, and BISWAJIT SAHU. "Non-planar dust-acoustic solitary waves and double layers in a four-component dusty plasma with super thermal electrons." Journal of Plasma Physics 79, no. 5 (2013): 691–98. http://dx.doi.org/10.1017/s0022377813000287.

Full text
Abstract:
AbstractThe properties of non-planar (cylindrical and spherical) dust-acoustic solitary waves (DA SWs) and double layers (DLs) in an unmagnetised collisionless four-component dusty plasma, whose constituents are positively and negatively charged dust grains, super thermal electrons and Boltzmannian ions are investigated by deriving the modified Gardner (MG) equation. The well known reductive perturbation method is employed to derive the MG equation and solve it numerically to study the nonlinear features of the finite amplitude non-planar DA Gardner solitons (GSs) and DLs, which are shown to exist for κ around its critical value κc (where, κ is the super thermal parameter and κc is the value of κ corresponding to the vanishing of the nonlinear coefficient of the Korteweg-de Vries (K-dV) equation). It is seen that the properties of non-planar DA SWs and DLs are significantly differs in non-planar geometry from planar geometry. It is also found that the magnitude of the amplitude of positive and negative GSs decreases with κ and the width of positive and negative GSs increases with the increase of κ.
APA, Harvard, Vancouver, ISO, and other styles
5

Hanisch, F., and J. N. Crowley. "Ozone decomposition on Saharan dust: an experimental investigation." Atmospheric Chemistry and Physics Discussions 2, no. 6 (2002): 1809–45. http://dx.doi.org/10.5194/acpd-2-1809-2002.

Full text
Abstract:
Abstract. The heterogeneous reaction between O3 and authentic Saharan dust surfaces was investigated in a Knudsen reactor at approx 296 K. O3 was destroyed on the dust surface and O2 was formed with conversion efficiencies of 1.0 and 1.3 molecules O2 per O3 molecule destroyed for unheated and heated samples, respectively. No O3 desorbed from exposed dust samples, showing that the uptake was irreversible. The uptake coefficients for the irreversible destruction of O3 on (unheated) Saharan dust surfaces depended on the O3 concentration and varied between 3.5 x10-4 and 5.5 x10-6 for the initial uptake coefficient (g0 approx 3 x10-5 at 30 ppbv O3 STP) and between 4.8 x10-5 and 2.2 x10-6 for the steady-state uptake coefficient (gss approx 7 x10-6 at 30 ppbv O3 STP). At very high O3 concentrations the surface was deactivated, and O3 uptake ceased after a certain exposure period. Sample re-activation (i.e. de-passivation) was found to occur over periods of hours, after exposure to O3 had ceased, suggesting that re-activation processes play a role both in the laboratory and in the atmosphere.
APA, Harvard, Vancouver, ISO, and other styles
6

Hanisch, F., and J. N. Crowley. "Ozone decomposition on Saharan dust: an experimental investigation." Atmospheric Chemistry and Physics 3, no. 1 (2003): 119–30. http://dx.doi.org/10.5194/acp-3-119-2003.

Full text
Abstract:
Abstract. The heterogeneous reaction between O3 and authentic Saharan dust surfaces was investigated in a Knudsen reactor at approx 296 K. O3 was destroyed on the dust surface and O2 was formed with conversion efficiencies of 1.0 and 1.3 molecules O2 per O3 molecule destroyed for unheated and heated samples, respectively. No O3 desorbed from exposed dust samples, showing that the uptake was irreversible. The uptake coefficients for the irreversible destruction of O3 on (unheated) Saharan dust surfaces depended on the O3 concentration and varied between 3.5 x 10-4 and 5.5 x 10-6 for the initial uptake coefficient (g0 approx 3 x 10-5 at 30 ppbv O3 STP) and between 4.8 x 10-5 and 2.2 x 10-6 for the steady-state uptake coefficient (gss approx 7 x10-6 at 30 ppbv O3 STP). At very high O3 concentrations the surface was deactivated, and O3 uptake ceased after a certain exposure period. Sample re-activation (i.e. de-passivation) was found to occur over periods of hours, after exposure to O3 had ceased, suggesting that re-activation processes play a role both in the laboratory and in the atmosphere.
APA, Harvard, Vancouver, ISO, and other styles
7

UCHYIGIT, GULDEN, and KEITH CLARK. "A NEW FEATURE SELECTION METHOD FOR TEXT CLASSIFICATION." International Journal of Pattern Recognition and Artificial Intelligence 21, no. 02 (2007): 423–38. http://dx.doi.org/10.1142/s0218001407005466.

Full text
Abstract:
Text classification is the problem of classifying a set of documents into a pre-defined set of classes. A major problem with text classification problems is the high dimensionality of the feature space. Only a small subset of these words are feature words which can be used in determining a document's class, while the rest adds noise and can make the results unreliable and significantly increase computational time. A common approach in dealing with this problem is feature selection where the number of words in the feature space are significantly reduced. In this paper we present the experiments of a comparative study of feature selection methods used for text classification. Ten feature selection methods were evaluated in this study including the new feature selection method, called the GU metric. The other feature selection methods evaluated in this study are: Chi-Squared (χ2) statistic, NGL coefficient, GSS coefficient, Mutual Information, Information Gain, Odds Ratio, Term Frequency, Fisher Criterion, BSS/WSS coefficient. The experimental evaluations show that the GU metric obtained the best F1 and F2 scores. The experiments were performed on the 20 Newsgroups data sets with the Naive Bayesian Probabilistic Classifier.
APA, Harvard, Vancouver, ISO, and other styles
8

Eroglu, Emre. "Discussing Total Electron Content over the Solar Wind Parameters." Mathematical Problems in Engineering 2022 (February 28, 2022): 1–14. http://dx.doi.org/10.1155/2022/9592008.

Full text
Abstract:
Modeling and forecasting of Total Electron Content (TEC) values by an Artificial Neural Network model (ANNm) have high agreement on November 2003, 2004 superstorms. The work discusses Solar Wind Parameters (SWp) from OMNI (Operating Missions as a Node on the Internet) and TEC (TECU) data (International Reference Ionosphere) IRI-2012, IRI-2016 on November 20, 2003 (Dst = –422 nT) and on November 08, 2004 (Dst = –374 nT) Geomagnetic Storms (GSs). The paper commences with a 120-hour GS exhibition of SWp and proceeds with the correlation data of the variables, their hierarchical tracks, and inner dispersions. The ANNm with SWp as the input and TEC data as the output are introduced. The performance of the ANNm for 2003 and 2004 superstorms is adequate. The Correlation Coefficient (R) and Root Mean Square Error (RMSE) of the ANNm are 97.5%, 1.17 TECU (IRI-2012), and 97.9%, 1.09 TECU (IRI-2016) for the 2003 GS and 97.0%, 0.89 TECU (IRI-2012), and 98.0%, 1.61 TECU (IRI-2016) for 2004 GS. Parameters effect of the R constant of TEC data points out to the dynamic pressure (nPa), the magnetic field Bz component (nT), the flow speed (km/s), and the proton density (1/cm3). Besides, the absolute total error and the variance of the predicted TEC data for November 2003 and November 2004 GSs are 0.06 (0.30%) with 0.013 variance (IRI-2012), 0.09 (0.49%) with 0.016 variance (IRI-2016) for 2003 storm and 0.13 (0.73%) with 0.033 variance (IRI-2012), and 0.11 (1.06%) with 0.035 variance (IRI-2016) for 2004. It means that the paper models TEC data with considerable consistency over the SWp.
APA, Harvard, Vancouver, ISO, and other styles
9

Rossi, Gemma Caterina Maria, Federica Bettio, Mariano González-Pérez, Aba Briola, Gemma Ludovica Maria Pasinetti, and Luigia Scudeller. "The 17-Item Computer Vision Symptom Scale Questionnaire (CVSS17): Translation, Validation and Reliability of the Italian Version." International Journal of Environmental Research and Public Health 19, no. 5 (2022): 2517. http://dx.doi.org/10.3390/ijerph19052517.

Full text
Abstract:
Background. To validate the 17-item Computer Vision Symptom Scale questionnaire (CVSS17) in Italian. Methods. Cross-sectional validation study on video terminal (VDT) users and a reference sample of subjects not working at a VDT (control group), cognitively able to respond to a health status interview. The Italian self-administered version of the CVSS17 questionnaire was administered to all participants. The reliability and validity of the Italian translation of the CVSS17 were tested using standard statistical methods for questionnaire validation. The Rasch analysis was performed as well. Results. A total of 216 subjects were enrolled. Concerning the reliability, the Cronbach’s alpha coefficient was 0.925 (from 0.917 to 0.924), and the test–retest stability was 0.91 (<0.001). Concerning the validity, the control group had significantly better scores, and there were good correlations between responses to the CVSS17 and analogous domains of the GSS. Conclusion. The Italian version of the CVSS17 has shown psychometric properties comparable to those of the Spanish version, having good validity, discriminatory power, internal consistency and reliability. The questionnaire is a specific measure of vision-related quality of life in Italian-speaking VDT workers and can be used both in clinical practice and for research purposes.
APA, Harvard, Vancouver, ISO, and other styles
10

Panggoa, Risliana. "The Suitability of Building Permit Proposal and Implementation in Kecamatan Makale Kabupaten Tana Toraja." JURNAL PEMBANGUNAN WILAYAH & KOTA 8, no. 1 (2012): 87. http://dx.doi.org/10.14710/pwk.v8i1.11561.

Full text
Abstract:
The development of a city is always influenced by the activities of the community which requiredland for the activities to take place. Limited land availability demanded a sound control mechanismto ensure the sustainability of the economic growth. The general society has not yet fullyunderstood Building Permit (Izin Mendirikan Bangunan ‐ IMB) as the instrument of control ofspatial use, resulting in mismatches between the actual building and the one proposed in the IMB.This research aimed to find the factors driving the mismatches in the IMB implementation withinthe local Makale community’s understanding to concept of IMB. The study employed quantitativedescriptive methods using frequency distribution tables and factor analysis. Factor analysis showedhow lack of understanding and awareness in the concept of IMB, together with poor policy andexecution by the local government have prevented the fully implementation. Some of theviolations found included total building area, building function, Basic Structural Coefficient(Koefisien Dasar Bangunan ‐ KDB), Building Line (Garis Sempadan Bangunan ‐ GSB), and River Line(Garis Sempadan Sungai ‐ GSS). The study concluded the need for IMB awareness promotionthrough socialization along with the technical procedures, enhancement of IMB monitoring andevaluation processes, finalization of IMB as regional regulation, and enforcement.Keywords: city development, land use control, IMB, law enforcement
APA, Harvard, Vancouver, ISO, and other styles
More sources

Dissertations / Theses on the topic "GSS coefficient"

1

Yip, C. W. H. "Compressible discharge coefficients of branching flows." Thesis, University of Aberdeen, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.233007.

Full text
Abstract:
A two-dimensional numerical model for compressible branching flow through a slot is described for the purpose of predicting the discharge coefficients of film cooling holes in gas turbine blades. The method employs free-streamline theory and the hodograph transformation. It calculates the area ratio of hole to duct and the contraction coefficient from a set of prescribed boundary conditions. An approximate method for calculating the compressible contraction coefficients is also discussed in the thesis. It employs the incompressible theory previously developed by McNown and Hsu (1951) for the free efflux, the 'compressibility factor' and the flow parameter (P<sub>o</sub>-P<sub>j</sub>)/(P<sub>o</sub>-P<sub>1</sub>), where P<sub>o</sub>, P<sub>j</sub>, P<sub>1</sub> represent the stagnation pressure, the static pressure of the jet and the static pressure of the approach flow, respectively. The advantages of using this method are the direct input of the area ratio of hole to duct and its speed of calculation. Experimental tests were performed using a specially designed rig in a supersonic wind tunnel. The investigations included sharp-edged slots with three different widths, a single hole and a row of two holes. The approach velocity in terms of the characteristic Mach number ranged from 0.18 to 0.58 and the pressure ratio P<sub>o</sub>/P<sub>j</sub>, ranged from 1.10 to 1.97. Agreement between the experimental data and the theoretical values was good to within the experimental accuracy (typically around +/- 5%) for the slots and the 2-hole configuration. For the 1-hole configuration, less bleed flow than predicted was observed, with the discrepancy varying from 7% to 18%. The latter case is a very severe test of a purely two-dimensional theory. The results for the 2-hole plate suggest that the slot theory can in fact be used to predict the flow through a row of holes with small pitch to diameter ratios.
APA, Harvard, Vancouver, ISO, and other styles
2

Dremetsika, Assimina V., Panayotis A. Siskos, and Nicholas A. Katsanos. "Coefficients in solid-state diffusion by inverse gas chromatography." Universitätsbibliothek Leipzig, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-196477.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

Dremetsika, Assimina V., Panayotis A. Siskos, and Nicholas A. Katsanos. "Coefficients in solid-state diffusion by inverse gas chromatography." Diffusion fundamentals 2 (2005) 89, S. 1-2, 2005. https://ul.qucosa.de/id/qucosa%3A14424.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

Khaldi, A. "Discharge coefficient of film cooling holes with rounded entries or exits." Thesis, University of Nottingham, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.378758.

Full text
APA, Harvard, Vancouver, ISO, and other styles
5

Bentz, Julie A. "Measurements of viscosity, velocity slip coefficients and tangential momentum accommodation coefficients for gas mixtures using a spinning rotor gauge /." free to MU campus, to others for purchase, 1999. http://wwwlib.umi.com/cr/mo/fullcit?p9946244.

Full text
APA, Harvard, Vancouver, ISO, and other styles
6

Gutierrez, Emmanuel David Mercado. "Thermal expansion coefficient for a trapped Bose gas during phase transition." Universidade de São Paulo, 2016. http://www.teses.usp.br/teses/disponiveis/76/76132/tde-27102016-102903/.

Full text
Abstract:
Ultra cold quantum gas is a convenient system to study fundamental questions of modern physics, such as phase transitions and critical phenomena. This master thesis is devoted to experimental investigation of the thermodynamics susceptibilities, such as the isothermal compressibility and the thermal expansion coefficient of a trapped Bose-Einstein condensate (BEC) of 87Rb atoms. The critical phenomena and the critical exponents across the transition can explain the behavior of the isothermal compressibility and the thermal expansion coefficient near the critical temperature TC. By employing the developed formalism of global thermodynamics variables, we carry out a statistical treatment of Bose gas in a 3D harmonic potential. After that, comparison of obtained results reveals the most appropriate state variables describing the system, namely volume and pressure parameter V and &Pi; respectively. The both are related with the confining frequencies and BEC density distribution. We apply this approach to define the set of new thermodynamic variables of BEC, and also to construct the isobaric phase diagram V T. Its allows us to extract the compressibility &kappa;T and the thermal expansion coefficient &beta;&Pi;. The behavior of the isothermal compressibility corresponds to the second-order phase transition, while the thermal expansion coefficient around the critical point behaves as &beta; &#8764; tr-&alpha;, where tr is reduced temperature of the system and &alpha; is the critical exponent on the basic of these. Results we have obtained the critical exponent &alpha; = 0.15&plusmn;0.09, which allows us to determine the system dimensionality by means of the scaling theory, relating the critical exponents with the dimensionality. As a result, we found out that the dimensionality of the system to be d &#8764; 3, one is in agreement with the real dimension of the system.<br>Amostras atômicas ultrafrias de um gás de Bose são convenientes para estudar questões fundamentais da física moderna, como as transições de fase e fenômenos críticos em condensados de Bose-Einstein (BEC). A minha dissertação dedica se à investigação das susceptibilidades termodinâmicas como a compressibilidade isotérmica e o coeficiente de expansão térmica de a traves da transição de um BEC de 87Rb. Os fenômenos críticos e os exponentes críticos a traves da transição podem explicar o comportamento da compressibilidade isotérmica e do coeficiente de expansão térmica perto da temperatura crítica TC. Ao empregar o desenvolvido formalismo das variáveis termodinâmicas globais, levamos a cabo o tratamento estatístico de um gás de Bose num potencial harmônico 3D. Depois da comparação dos resultados obtidos, revelam as mais apropriadas variáveis de estado descrevendo o sistema, chamadas parâmetro de volume e pressão, V e &Pi; respectivamente. As duas estão relacionadas com as frequências de confinamento e a distribuição de densidade do BEC. Nós aplicamos esta abordagem para definir um conjunto de novas variáveis termodinâmicas do BEC, e também para construir o diagrama de fase isobárico V T. O anterior nós permite extrair a compressibilidade &kappa;T e o coeficiente de expansão termina &beta;&Pi;. O comportamento da compressibilidade isotérmica corresponde a uma transição de fase de segunda ordem enquanto que o coeficiente de expansão térmica ao redor do ponto crítico comporta se como &beta; &#8764; tr-&alpha;, onde tr é a temperatura reduzida do sistema, e &alpha; o exponente crítico. Deste resultado nós obtemos um exponente critico, &alpha; = 0.15 &plusmn; 0.09, que permite determinar a dimensionalidade do sistema a traves da teoria de escala, relacionando os exponentes críticos com a dimensionalidade. Como resultado, encontramos que a dimensionalidade do sistema é d &#8764; 3 que está de acordo como a dimensão real do sistema.
APA, Harvard, Vancouver, ISO, and other styles
7

Davies, Stephen Nigel. "The evaluation of overall gas-liquid mass transfer coefficients in gas sparged agitated vessels." Thesis, University College London (University of London), 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.263106.

Full text
APA, Harvard, Vancouver, ISO, and other styles
8

Lu, Yuan. "A Study on Gas Quench Steel Hardenability." Digital WPI, 2015. https://digitalcommons.wpi.edu/etd-theses/125.

Full text
Abstract:
Gas quench technology has been rapidly developed recently with the intent to replace water and oil quench for medium and high hardenability steel. One of the significant advantages is to reduce the distortion and stress, compared to water and oil quench. However, not like liquid quench, no gas quench steel hardenability test standard exists. The fundamental difference between liquid quench and gas quench is heat transfer coefficient. The workpiece with the same hardness after liquid and gas quench process may have different microstructure due to different cooling curves. The concept of equivalent gas quench heat transfer coefficient (HTC) is proposed to have the same cooling curve, microstructure and hardness when compared with liquid quench. Several influencing factors on steel hardenability have been discussed, such as austenizing temperature, heating rate, holding time, composition variation and grain size difference. The phase quantification by X-ray Diffraction and Rietveld Refinement method is developed to measure phase percentage for steel microstructure, including martensite, ferrite and carbides. The limitations and improvements of modified Jominy gas quench test are discussed. The fundamental limitation of Jominy gas quench test is that one gas quench condition cannot be used for both low hardenability steel and high hardenability steel at the same time. The same steel grade would have different hardenability curves under different gas quench conditions, which made it difficult to compare the hardenability among different steels. The critical HTC test based on Grossmann test is proposed to overcome the limitations. In the test, different gas quench HTC conditions are applied to the sample with the same geometry. After sectioning each bar at mid-length, the bar that has 50% martensite at its center is selected, and the applied gas quench HTC of this bar is designated as the critical HTC. This test has many advantages to take the place of modified Jominy gas quench test. Since one of the advantages of gas quench is greater process flexibility to vary cooling rates, gas marquenching technology is proposed to obtain martensite with less sever cooling rate and reduce the distortion and stress.
APA, Harvard, Vancouver, ISO, and other styles
9

Kerr, Bradley Gray. "Experimental and theoretical rotordynamic coefficients and leakage of straight smooth annular gas seals." Texas A&M University, 2004. http://hdl.handle.net/1969.1/1518.

Full text
Abstract:
Results are presented for experimental and theoretical rotordynamic coefficients and leakage of straight smooth annular gas seals. Experimental rotordynamic coefficients were measured and trends in changes of rotordynamic coefficients with operating variables such as rotor speed, back-pressure, fluid preswirl, and seal clearance are analyzed. Experimental results show that cross-coupled stiffness coefficients are highly influenced by fluid preswirl and only moderately influenced by other operating parameters, whereas direct damping is nearly unaffected by changes in operating parameters. Effective damping, a good indicator of stability, is highly affected by fluid preswirl. Although rotordynamic coefficients of straight smooth annular gas seals are assumed to be frequency independent, experimental results suggest a frequency dependent nature at high back-pressures and high excitation frequencies. Experimental results for rotordynamic coefficients and leakage are compared with theoretical predictions of ISOTSEAL, an isothermal-flow, two-control-volume, bulk-flow rotordynamic analysis program. All rotordynamic coefficients are underpredicted. Direct stiffness is poorly predicted while cross-coupled stiffness and direct damping are predicted reasonably well. Leakage is also consistently under-predicted. Theory predicts a slight frequency dependent nature for a limited number of test configurations.
APA, Harvard, Vancouver, ISO, and other styles
10

Teixeira, José Reinaldo Paranaíba Vilela Alves. "High spatial variability of carbon emission and gas exchange coefficient in three tropical reservoirs." Universidade Federal de Juiz de Fora (UFJF), 2017. https://repositorio.ufjf.br/jspui/handle/ufjf/5656.

Full text
Abstract:
Submitted by isabela.moljf@hotmail.com (isabela.moljf@hotmail.com) on 2017-08-21T12:33:28Z No. of bitstreams: 1 josereinaldoparanaíbavilelaalvesteixeira.pdf: 2117426 bytes, checksum: aa0a05017e73d403c957cab1a18a6f52 (MD5)<br>Rejected by Adriana Oliveira (adriana.oliveira@ufjf.edu.br), reason: on 2017-08-24T11:30:53Z (GMT)<br>Submitted by isabela.moljf@hotmail.com (isabela.moljf@hotmail.com) on 2017-08-24T13:22:27Z No. of bitstreams: 0<br>Approved for entry into archive by Adriana Oliveira (adriana.oliveira@ufjf.edu.br) on 2017-08-30T12:31:54Z (GMT) No. of bitstreams: 0<br>Made available in DSpace on 2017-08-30T12:31:54Z (GMT). No. of bitstreams: 0 Previous issue date: 2017-02-22<br>FAPEMIG - Fundação de Amparo à Pesquisa do Estado de Minas Gerais<br>-<br>Reservoirs are significant sources of carbon emission to the atmosphere. However the magnitude of this emission has huge uncertainties, partly related to the methods of sampling and partly related to the unconsidered spatial-temporal variability. Here we examined the spatial variability and its drivers of partial pressure, gas exchange coefficient and diffusive flux of CO2 and CH4 in three tropical reservoirs. We observed high spatial variability in CO2 and CH4 concentration and flux within the reservoirs. Our results suggest that all reservoirs were supersaturated in both gases, even considering that some areas were CO2 sinks. A large spatial variability in k600 for CO2 and CH4, and consistently observed k600CH4 values higher than k600CO2 were also observed in all reservoirs. We could explain the high spatial variability of CO2 and CH4 by a combination of parameters such as dissolved oxygen, pH, chlorophyll, wind speed and bathymetry. Finally, we suggest a minimum sampling effort required to representatively cover a study site. Our results illustrate the first specially-resolved analysis of CH4 emissions in reservoirs, and we suggest that in large systems (area ≥ 1,000 km²) and small systems (area ≤ 100 km²), 600 and 200 measurements sites, respectively, are need for a representative dry period carbon flux estimates.
APA, Harvard, Vancouver, ISO, and other styles
More sources

Books on the topic "GSS coefficient"

1

Rathbun, R. E. Gas-film coefficients for the volatilization of ketones from water. U.S. G.P.O., 1986.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
2

Environment, Alberta Alberta, ed. Specified gas emitters regulation: Soil carbon custom coefficient/protocols guidance document. Alberta Environment, 2007.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
3

C, Nelson Clayton, Texas A & M University. Turbomachinery Laboratories, and Lewis Research Center, eds. Theory versus experiment for the rotordynamic coefficients of annular gas seals. Mechanical Engineering Department, Turbomachinery Laboratories, Texas A&M University, 1985.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
4

George C. Marshall Space Flight Center., ed. The temperature variation of hydrogen diffusion coefficients in metal alloys. National Aeronautics and Space Administration, George C. Marshall Space Flight Center, 1990.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
5

Singh, Jag J. Measurement of viscosity of gaseous mixtures at atmospheric pressure. National Aeronautics and Space Administration, Scientific and Technical Information Branch, 1986.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
6

A, Hoffbauer Mark, and Lyndon B. Johnson Space Center., eds. Measurement of momentum transfer coefficients for H₂, N₂, CO, and CO₂ incident upon spacecraft surfaces. National Aeronautics and Space Administration, Lyndon B. Johnson Space Center, 1997.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
7

J, Van Wie Bernard, and National Institute of Standards and Technology (U.S.), eds. Evaluation of data availability and quality for interaction second virial coefficients of use to the gas industry. U.S. Dept. of Commerce, National Bureau of Standards, 1988.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
8

Elrod, David Alan. A comparison of experimental and theoretical results for rotordynamic coefficients of four annular gas seals: Progress report. National Aeronautics and Space Administration?, 1985.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
9

United States. National Aeronautics and Space Administration., ed. Laboratory studies of low temperature rate coefficients: The atmospheric chemistry of the outer planets : final report, December, 1993. National Aeronautics and Space Administration, 1993.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
10

United States. National Aeronautics and Space Administration., ed. Laboratory studies of low temperature rate coefficients: The atmospheric chemistry of the outer planets : final report, December, 1993. National Aeronautics and Space Administration, 1993.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
More sources

Book chapters on the topic "GSS coefficient"

1

Li, Ying, Liang Guo, Chao Zhang, Hongbo You, and Yuanfeng Zan. "Numerical Study on the Mechanism of Oxygen Diffusion During Oxygen Control Process in Heavy Liquid Metals." In Springer Proceedings in Physics. Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-99-1023-6_63.

Full text
Abstract:
AbstractIn order to investigate the mechanisms and characteristics of oxygen diffusion during oxygen control in Heavy Liquid Metals (HLM). Turbulence model coupling species transport model are used to predict the oxygen transport and distribution in liquid lead-bismuth eutectic (LBE) during gas oxygen control process. The oxygen mass flow coefficients are calculated under diffident LBE temperatures, inlet LBE flow rates, inlet oxygen concentrations and gas/liquid interface oxygen concentrations. A mass transfer correlation for oxygen transport is finally acquired. The simulated results indicate that oxygen transport is mainly influenced by the combined effect of convection and diffusion. Specifically, the mass flow coefficient increases with the increase of mass flow coefficient and LBE temperature. The gas/liquid interface oxygen concentration has little effect on the oxygen mass transfer coefficient in the oxygen transfer device of this study. Comparatively, the smaller inlet oxygen concentration leads to the larger average oxygen mass transfer coefficient and the effects of inlet oxygen concentration become weaker with the increase of flow rate. The numerical data presented in this study represents an essential step to reveal the mechanism of oxygen transport in flowing LBE and provides the theoretical basis for guiding the design of oxygen transfer device in HLM-cooled nuclear reactors.
APA, Harvard, Vancouver, ISO, and other styles
2

Shekhar, Shashi, and Hui Xiong. "Moran Coefficient." In Encyclopedia of GIS. Springer US, 2008. http://dx.doi.org/10.1007/978-0-387-35973-1_816.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

Shekhar, Shashi, and Hui Xiong. "Geary Coefficient." In Encyclopedia of GIS. Springer US, 2008. http://dx.doi.org/10.1007/978-0-387-35973-1_444.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

Flower, D. R., T. S. Monteiro, G. Pineau des Forêts, and E. Roueff. "Chemistry in Shocked Interstellar Gas." In Rate Coefficients in Astrochemistry. Springer Netherlands, 1988. http://dx.doi.org/10.1007/978-94-009-3007-0_17.

Full text
APA, Harvard, Vancouver, ISO, and other styles
5

Jantzen, Jens. "Gaussian binomial coefficients." In Lectures on Quantum Groups. American Mathematical Society, 1995. http://dx.doi.org/10.1090/gsm/006/02.

Full text
APA, Harvard, Vancouver, ISO, and other styles
6

Davis, James, and Paul Kirk. "Homology with local coefficients." In Lecture Notes in Algebraic Topology. American Mathematical Society, 2001. http://dx.doi.org/10.1090/gsm/035/05.

Full text
APA, Harvard, Vancouver, ISO, and other styles
7

Krylov, N. "Equations with VMO coefficients." In Lectures on Elliptic and Parabolic Equations in Sobolev Spaces. American Mathematical Society, 2008. http://dx.doi.org/10.1090/gsm/096/06.

Full text
APA, Harvard, Vancouver, ISO, and other styles
8

Wu, Lei. "Slip and Jump Coefficients." In Rarefied Gas Dynamics. Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-19-2872-7_10.

Full text
APA, Harvard, Vancouver, ISO, and other styles
9

Yuan, Leqi, Kun Cheng, Haozhi Bian, Yaping Liao, and Chenxi Jiang. "Numerical Simulation of Flow Boiling Heat Transfer in Helical Tubes Under Marine Conditions." In Springer Proceedings in Physics. Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-99-1023-6_86.

Full text
Abstract:
AbstractLead-based cooled reactors in most countries and some small reactors at sea use helical tube steam generators. Compared with U-tubes, the convection heat transfer coefficient in the spiral tube is higher, the structure is more compact, and the secondary flow is generated under the action of centrifugal force and gravity, which can achieve the effect of wetting the inner wall of the tube. However, due to the importance of the steam generator in the reactor and the complexity of the flow and boiling in the helical tube, the aggregation behavior of bubbles, the distribution of the two-phase interface and the secondary flow in the tube will significantly affect the heat transfer characteristics, so the gas-liquid phase in the tube is studied. Distribution, changes in heat transfer coefficients, and fluid flow characteristics are very important.In order to study the boiling heat transfer characteristics of helical once-through steam generators under static and marine conditions to provide safe and reliable energy supply for offshore facilities such as marine floating, this study uses STAR-CCM+ software, VOF method and Rohsenow boiling model to study the heat transfer capacity and flow characteristics of flow boiling in a helical tube under swaying and tilting conditions. The gas-liquid phase distribution characteristics, secondary flow variation characteristics and convective heat transfer coefficient of the fluid under different swing functions and inclined positions are obtained by numerical calculation, and the law of physical parameters changing with the cycle is found. The research results show that the secondary flow and heat transfer capacity in the tube change with the cycle, and the change is most obvious at the tube length of 0.8m. 5% of the normal condition; when the inclination angle is 45°, the maximum increase of the convection heat transfer coefficient is 16.8%, and the maximum decrease is 6.6%.
APA, Harvard, Vancouver, ISO, and other styles
10

Ignatidis, Panagiotis, Henrik von der Haar, Christoph Hennecke, and Friedrich Dinkelacker. "Impact of Mixing on the Signature of Combustor Defects." In Regeneration of Complex Capital Goods. Springer International Publishing, 2024. http://dx.doi.org/10.1007/978-3-031-51395-4_6.

Full text
Abstract:
AbstractDefects in the combustion chamber can negatively influence the performance of an aircraft engine and increase component stress in the turbine. One aim of the Collaborative Research Center 871 is to provide early prediction about the condition of the engine by analysing the signature of the exhaust gas jet. This includes the usage of machine learning techniques and helps to optimise maintenance times and to reduce costs. This topic is linked to the question, how defects in the combustion chamber affect the flow field and how the defect signature is mixed out in the hot gas path. Examples are shown for a simplified ring burning chamber, where several experimental and numerical studies have been done. Additionally, one failure case is described in detail here, where the methodology is applied to a real size gas turbine burning chamber and its subsequent turbine. Furthermore the diffusion theory is generalized to situations with complex geometrical boundary conditions, for instance from the turbine passage channel geometry. This approach is applied on the investigated example case and shows complex thermal diffusion coefficients, being in the order of 10,000–100,000 times larger than the molecular diffusion coefficient. Even these large values allow the determination of burning chamber defects from the exhaust flow pattern.
APA, Harvard, Vancouver, ISO, and other styles

Conference papers on the topic "GSS coefficient"

1

Li, Jun-jie, Yong Wei, and Rui Zhou. "Dynamic development coefficient analysis using grey system theory." In 2011 International Conference on Grey Systems and Intelligent Services (GSIS 2011). IEEE, 2011. http://dx.doi.org/10.1109/gsis.2011.6044127.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

Chang, Che-Jung, and Wen-Li Dai. "A grey silhouette coefficient for the small sample forecasting." In 2013 IEEE International Conference on Grey Systems and Intelligent Services (GSIS). IEEE, 2013. http://dx.doi.org/10.1109/gsis.2013.6714745.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

Zhang, Zhuo, Yanyu Wang, and Zhengxin Wang. "A grey TOPSIS method based on weighted relational coefficient." In 2013 IEEE International Conference on Grey Systems and Intelligent Services (GSIS). IEEE, 2013. http://dx.doi.org/10.1109/gsis.2013.6714837.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

Taslim, M. E., and C. M. Wadsworth. "Am Experimental Investigation of the Rib Surface-Averaged Heat Transfer Coefficient in a Rib-Roughened Square Passage." In ASME 1994 International Gas Turbine and Aeroengine Congress and Exposition. American Society of Mechanical Engineers, 1994. http://dx.doi.org/10.1115/94-gt-162.

Full text
Abstract:
Turbine blade cooling, a common practice in modern aircraft engines, is accomplished, among other methods, by passing the cooling air through an often serpentine passage in the core of the blade. Furthermore, to enhance the heat transfer coefficient, these passages are roughened with rib-shaped turbulence promoters (turbulators). Considerable data are available on the heat transfer coefficient on the passage surface between the ribs. However, the heat transfer coefficients on the surface of the ribs themselves have not been investigated to the same extent. In small aircraft engines with small cooling passages and relatively large ribs, the rib surfaces comprise a large portion of the passage heat transfer area. Therefore, an accurate account of the heat transfer coefficient on the rib surfaces is critical in the overall design of the blade cooling system. The objective of this experimental investigation was to conduct a series of thirteen tests to measure the rib surface-averaged heat transfer coefficient, in a square duct roughened with staggered 90° ribs. To investigate the effects that blockage ratio, e/Dh, and pitch-to-height ratio, S/e, have on hrib and passage friction factor, three rib geometries corresponding to blockage ratios of 0.133. 0.167 and 0.25 were tested for pitch-to-height ratios of 5, 7, 8.5 and 10. Comparisons were made between the rib average heat transfer coefficient and that on the wall surface between two ribs, hflor, reported previously. Heat transfer coefficients of the upstream-most rib and that of a typical rib located in the middle of the rib-roughened region of the passage wall were also compared. It is concluded that: 1) the rib average heat transfer coefficient is much higher than that for the area between the ribs, 2) similar to the heat transfer coefficient on the surface between the ribs, the average rib heat transfer coefficient increases with the blockage ratio, 3) a pitch-to-height ratios of 8.5 consistently produced the highest rib average heat transfer coefficients amongst all tested, 4) under otherwise identical conditions, ribs in upstream-most position produced lower heat transfer coefficients than the mid-channel positions, 5) the upstream-most rib average heat transfer coefficients decreased with the blockage ratio, and 6) thermal performance decreased with increased blockage ratio. While a pitch-to-height ratio of 8.5 and 10 had the highest thermal performance for the smallest rib geometry, thermal performance of high blockage ribs did not change significantly with the pitch-to-height ratio.
APA, Harvard, Vancouver, ISO, and other styles
5

Rudyak, V. Ya, A. A. Belkin, V. V. Egorov, and Takashi Abe. "Effective Viscosity Coefficient of Nanosuspensions." In RARIFIED GAS DYNAMICS: Proceedings of the 26th International Symposium on Rarified Gas Dynamics. AIP, 2008. http://dx.doi.org/10.1063/1.3076527.

Full text
APA, Harvard, Vancouver, ISO, and other styles
6

Sitaram, N., M. Govardhan, and K. V. Murali. "Effects of Inlet Pressure Distortion on the Performance and Flow Field of a Centrifugal Compressor at Off-Design Conditions." In ASME 2012 Gas Turbine India Conference. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/gtindia2012-9529.

Full text
Abstract:
The present paper presents experimental results on the effects of inlet total pressure distortion on the performance and flow field of a centrifugal compressor. The total pressure at inlet is artificially distorted by means of a perforated sheet, which is supported by a support mesh. A total of eleven configurations, including clean inlet configuration, are tested. Performance measurements and impeller inlet and exit flow studies at three flow coefficients, one near design flow coefficient, one below design flow coefficient and one above design flow coefficient, are carried out. The present paper presents and discusses results at off-design flow coefficients and the effects of stage loading on the distortion effects are presented. A new parameter, Distortion Index (DI) is introduced. As DI increases, the mass averaged total pressure at exit stations decreases. Distortion sector angle of 60° having the lowest total pressure is found to be the critical sector for circumferential distortion configurations. As the Distortion Correlation parameter, DC(60) increases, the mass averaged total pressure for circumferential distortion configuration decreases, except in the case of low flow coefficient where DC(60) is nearly constant. DC(60) also increases with sector angle. The static pressure normalized with static pressure for clean inlet decreases as the distortion sector angle is increased. Distortion attenuates the static pressure as the flow passes through the vaneless diffuser. The attenuation increases with the distortion sector angle.
APA, Harvard, Vancouver, ISO, and other styles
7

Haibo Ren, Yaoguo Dang, and Zhengxin Wang. "GM(1 ,1) model of time sequence coefficient and application." In 2007 IEEE International Conference on Grey Systems and Intelligent Services. IEEE, 2007. http://dx.doi.org/10.1109/gsis.2007.4443314.

Full text
APA, Harvard, Vancouver, ISO, and other styles
8

Chu, Tay, A. Brown, and S. Garrett. "Discharge Coefficients of Impingement and Film Cooling Holes." In ASME 1985 International Gas Turbine Conference and Exhibit. American Society of Mechanical Engineers, 1985. http://dx.doi.org/10.1115/85-gt-81.

Full text
Abstract:
In this article measurements of fluid flow through impingement and film cooling holes for typical turbine blade cooling systems are presented. The purpose of the measurements was to determine hole discharge coefficients over a range of Reynolds numbers from 5,000 to 30,000 and to observe in this range the dependence of discharge coefficient on Reynolds number. The effect of hole geometry, that is, sharp edged inlet or corner radius inlet, on discharge coefficients is also measured. Correlations relating discharge coefficients to Reynolds number, corner radius to hole diameter ratio, and blowing parameter are suggested.
APA, Harvard, Vancouver, ISO, and other styles
9

Cho, Hyung Hee, and Richard J. Goldstein. "Total-Coverage Discrete Hole Wall Cooling." In ASME 1995 International Gas Turbine and Aeroengine Congress and Exposition. American Society of Mechanical Engineers, 1995. http://dx.doi.org/10.1115/95-gt-012.

Full text
Abstract:
The present study investigates heat/mass transfer for flow through perforated plates for application to combustor wall and turbine blade film cooling. The experiments are conducted for hole length-to-diameter ratios of 0.68 to 1.5, for hole pitch-to-diameter ratios of 1.5 and 3.0, for gap distance between two parallel perforated plates of 0 to 3 hole diameters, and for Reynolds numbers of 60 to 13,700. Local heat/mass transfer coefficients near and inside the cooling holes are obtained using a naphthalene sublimation technique. Detailed knowledge of the local transfer coefficients is essential to analyze thermal stress in turbine components. The results indicate that the heat/mass transfer coefficients inside the hole surface vary significantly due to flow separation and reattachment. The transfer coefficient near the reattachment point is about four and half times that for a fully developed circular tube flow. The heat/mass transfer coefficient on the leeward surface has the same order as that on the windward surface because of a strong recirculation flow between neighboring jets from the array of holes. For flow through two in-line layers, the transfer coefficient affected by the gap spacing is approximately 100% higher on the windward surface of the second wall and is about 20% lower on the inside hole surface than that with a single layer. The transfer coefficient on the leeward surface is not affected by upstream flow conditions due to probably strong recirculation in the wake flow.
APA, Harvard, Vancouver, ISO, and other styles
10

Ren, Bin, Xiaoying Tang, Hongliang Lu, et al. "Experimental Investigation on Condensation in Corrugated Low Finned Tubes in Presence of Noncondensable Gas." In ASME 2017 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/pvp2017-65607.

Full text
Abstract:
The phenomenon of condensation with noncondensable gas widely exists in many industrial processes. In this paper, the effect of noncondensable gas on condensation heat transfer inside corrugated low finned tubes is investigated experimentally. Air is mixed into steam playing the role of noncondensable gas. The effects of gas mixture inlet conditions and condensation tubes structural parameters are investigated. The results show that the influence mechanism inside corrugated low finned tubes is similar with that inside smooth tubes. The heat transfer coefficient decreases as noncondensable gas fraction increases. However, the decreasing rate is gradually reduced. Increasing inlet mass flux could enhance the heat transfer coefficient especially at small heat transfer rate. And the heat transfer coefficient decreases with the increase of inlet pressure. The heat transfer coefficients inside smaller pitches tubes are higher than that inside larger pitches tubes, and the declining rate is also slightly faster. When the noncondensable gas fraction is large enough, the difference of heat transfer coefficients between different enhanced tubes can be ignored. Tube with the largest protrusion height has the highest heat transfer coefficient. And the gap of heat transfer coefficients between different protrusion heights is larger than that between different pitches. This shows that the protrusion heights have greater influence on condensation compared with pitches.
APA, Harvard, Vancouver, ISO, and other styles

Reports on the topic "GSS coefficient"

1

Allen, Luke, Joon Lim, Robert Haehnel, and Ian Detwiller. Rotor blade design framework for airfoil shape optimization with performance considerations. Engineer Research and Development Center (U.S.), 2021. http://dx.doi.org/10.21079/11681/41037.

Full text
Abstract:
A framework for optimizing rotor blade airfoil shape is presented. The framework uses two digital workflows created within the Galaxy Simulation Builder (GSB) software package. The first is a workflow enabling the automated creation of a surrogate model for predicting airfoil performance coefficients. An accurate surrogate model for the rapid generation of airfoil coefficient tables has been developed using linear interpolation techniques that is based on C81Gen and ARC2D CFD codes. The second workflow defines the rotor blade optimization problem using GSB and the Dakota numerical optimization library. The presented example uses a quasi-Newton optimization algorithm to optimize the tip region of the UH-60A main rotor blade with respect to vehicle performance. This is accomplished by morphing the blade tip airfoil shape for optimum power, subject to a constraint on the maximum pitch link load.
APA, Harvard, Vancouver, ISO, and other styles
2

Fournier, K. B., D. Pacella, B. C. Gregory, et al. Empirical evaluation of the radiative cooling coefficient for krypton gas in the FTU plasma. Office of Scientific and Technical Information (OSTI), 1997. http://dx.doi.org/10.2172/587131.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

Beavers. L51556 Pressure Loss in Compressor Yard Pipework. Pipeline Research Council International, Inc. (PRCI), 1987. http://dx.doi.org/10.55274/r0010212.

Full text
Abstract:
This handbook enables designers to reliably predict pressure losses in natural gas compressor and meter station yard piping under steady state flow conditions. Pressure loss data are presented in the form of non-dimensional pressure loss coefficients for a wide range of components. Many example calculation sare provided. Recommendations are also made on the installation of compressors to reduce pressure losses and increase efficiency. Also see related document, L51557.
APA, Harvard, Vancouver, ISO, and other styles
4

Hedrick, Jacob, and Timothy Jacobs. PR-457-14201-R02 Variable NG Composition Effects in LB 2S Compressor Engines Phase I Engine Response. Pipeline Research Council International, Inc. (PRCI), 2015. http://dx.doi.org/10.55274/r0010997.

Full text
Abstract:
This is the final report summarizing work completed during the first phase of the PRCI study on large bore two stroke lean burn integral compressor engine response to variable natural gas compositions for the purposes of engine control development. Accomplished tasks include the completion of a detailed literature review covering the research topic, a parametric study of laminar flame speeds and ignition delays for binary methane and ethane mixtures up to 30%, and a GT-Power engine model of the Colorado State GMV-4 research engine with associated validation data from CSU�s variable ethane effects study. The chemistry of the combustion reaction is crucial to accurate modeling; laminar flame speeds and ignition delays as function of composition were determined from the solutions to published chemical kinetics mechanisms GRI-Mech3.0 and Saudi Aramco Mech1.3, respectively. The Wiebe coefficients correlated to variations in ethane composition and spark timing were regressed from the crank angle resolved heat release rates. The Wiebe coefficients are the most significant achievement of this phase of the project, since they quantify the heat release as a function of composition. At this time, the Wiebe parameters only reflect the relative changes in the model since certain aspect of the models geometry are pending resolution. Future phases of the project could use the developed GT-Power model and Wiebe coefficients for development of control schemes that maintain emissions, speed and torque limits, and maximize thermal efficiency during a variable fuel composition event.
APA, Harvard, Vancouver, ISO, and other styles
5

Broerman, Eugene, and Sarah Simons. SwRI-26615 Hydrogen Blending in Natural Gas Compression Facilities. Pipeline Research Council International, Inc. (PRCI), 2025. https://doi.org/10.55274/r0000121.

Full text
Abstract:
There is current interest in the use of hydrogen to meet the climate change decarbonization goals for energy and transportation. While hydrogen is currently produced and transported in large quantities in the United States, the majority is transported through dedicated hydrogen pipeline systems. Very little is known about the operational risks associated with injecting hydrogen into pipelines that have been optimized for natural gas or repurposing those pipelines for pure hydrogen transportation. Hydrogen has widely different thermodynamic properties compared to methane dominant natural gas, most notably a negative Joule-Thomson coefficient and a compressibility factor that exceeds 1.0 for low pressures. Advantages to mixing hydrogen into natural gas are the lower pressure drop across long distances if volumetric flow is maintained, and the potential infrastructure savings from leveraging existing natural gas pipelines. Disadvantages include a lower overall energy content. Hydrogen has 1/3 the volumetric energy density of methane due to its low molecular weight (3 vs 10 kWh/Nm3), meaning storage and transport energy capacity is reduced unless the volume of gas transported is significantly increased. Report developed under the Emerging Fuels Institute with PRCI. Document security and set such that Only EFI members can download report.
APA, Harvard, Vancouver, ISO, and other styles
6

Davidovits, P., D. W. Worsnop, M. S. Zahniser, and C. E. Kolb. Measurement of gas/water uptake coefficients for trace gases active in the marine environment. Office of Scientific and Technical Information (OSTI), 1992. http://dx.doi.org/10.2172/5626361.

Full text
APA, Harvard, Vancouver, ISO, and other styles
7

Davidovits, P., D. W. Worsnop, M. S. Zahniser, and C. E. Kolb. Measurement of gas/water uptake coefficients for trace gases active in the marine environment. [Annual report]. Office of Scientific and Technical Information (OSTI), 1992. http://dx.doi.org/10.2172/10131238.

Full text
APA, Harvard, Vancouver, ISO, and other styles
8

Rudland. L52245 Improvements to the Two Curve Ductile Fracture Model - Soil-Elastic and Plastic Contributions. Pipeline Research Council International, Inc. (PRCI), 2007. http://dx.doi.org/10.55274/r0010625.

Full text
Abstract:
The most commonly used fracture analyses procedure for the prediction of minimum arrest toughness and fracture speed for axially running cracks in line pipe materials for natural gas transmission pipeline applications is the Battelle Two-Curve approach. This analysis procedure incorporates the gas-decompression behavior with the fracture toughness of the pipe material to predict the minimum Charpy energy required for crack arrest. For this model, the effect of backfill on the propagating crack fracture speeds is lumped into one empirically based �backfill coefficient,� which does not distinguish different soil types or strengths. This report provides a better understanding of soil behavior and its affect on the fracture speed of running axial flaws in buried line pipe materials. The results from this program are combined with other full-scale experimental data in developing a modification to the treatment of backfill in the Battelle Two-Curve approach for calculating minimum arrest toughness. This first major improvement to the Battelle Two-Curve approach is incorporated into a computer code called PIPE-DFRAC.
APA, Harvard, Vancouver, ISO, and other styles
9

Van Wie, Bernard J. Evaluation of data availability and quality for interaction second virial coefficients of use to the gas industry. National Bureau of Standards, 1988. http://dx.doi.org/10.6028/nbs.tn.1249.

Full text
APA, Harvard, Vancouver, ISO, and other styles
10

Hristodulo, Olga Igorevna, and Miliausha Ilgamovna Akhmetzianova. Development of a geo-information system for monitoring the attractiveness of municipalities using parametric, structural approaches (case of Republic of Bashkortostan). DOI CODE, 2021. http://dx.doi.org/10.18411/doicode-2021.003.

Full text
Abstract:
To date, one of the most important tasks of the State in ensuring the sustainable socio-economic and demographic development of the country is the regulation of migration processes. In the Republic of Bashkortostan in recent years there has been an increase in the number of people participating in both intraregional and extra-regional migration, which indicates the need to manage migration flows for the effective development of territories of this entity. In this connection, this article is dedicated to the development of GIS monitoring of the attractiveness of municipalities of the Republic of Bashkortostan, aimed at improving the effectiveness of decision-making in formulating migration policies in the region, based on a systematic combination of parametric and structural approaches. In the course of the study the analysis of existing approaches applied in this subject area, the methodology for determining the attractiveness coefficient of municipalities of the Republic of Bashkortostan was developed, A functional and information model for monitoring the attractiveness of municipalities has been developed, and a logical structural model of GIS monitoring the attractiveness of municipalities of the Republic of Bashkortostan has been built.
APA, Harvard, Vancouver, ISO, and other styles
You might also be interested in the extended bibliographies on the topic 'GSS coefficient' for particular source types:
Journal articles Dissertations / Theses Books
We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!

To the bibliography