bluuebunny/crossref_metadata_2025 huggingface dataset:
El devenir de la utopía economicista en el sistema escolar chileno
Authors: Leiva Jorge Alarcón , Camilla Claudio Frites , Poblete Carla Gajardo
Published: February 2015

Asumiendo que las transformaciones radicales introducidas a partir de la década de los 80, por la dictadura cívico-militar en el sistema educativo chileno, constituyen lo que se designa como utopía economicista, que estipuló el paso de un sistema eminentemente público y centralizado a uno gobernado por las reglas del mercado, se examinan los defectos que el esquema mostró en su desarrollo, defraudando a poco andar las promesas de eficiencia y calidad que eran los objetivos perseguidos y que motivaron dichas transformaciones. Con este objetivo, el trabajo muestra la devaluación de dicha utopía y cómo la analogía del mercado se revela errónea. Para ello se caracteriza críticamente el rol del Estado, en su calidad de proveedor, regulador y garante en el sistema escolar, la utilización de la información de resultados del sistema educativo, con sus usos dispares y en ocasiones contradictorios y, por último, la participación de los padres, de acuerdo al rol que les fue asignado por las reformas y el que efectivamente presentan en la actualidad. Se concluye señalando que para superar la situación es necesaria una racionalidad ampliada que sustituya aquella que orientó las políticas introducidas hace tres décadas y que ofrezca una respuesta a los problemas del sistema escolar chileno en su calidad y equidad.
Herd Evolution as a Forensic Tool
Authors: Levy Heleno Fassio  , Valdecir Vargas Castilho
Published: February 2015

The livestock sector has been identified as vulnerable to money laundering, according to the National Strategy against Corruption and Money Laundering - ENCCLA. Besides its importance for livestock management, the technic of herd evolution, as used in the present study, may be helpful in solving doubts about the compatibility between the growth or decline of a particular herd and the reproduction and movement of their animals. In this work, proceeded to the evolution of a cattle herd investigated through three scenarios for the period 2000 to 2007. Therefore, Animal Transit Guides (GTAs) and Statements of Vaccination against Foot-and-Mouth Disease (FMD) related to property investigated were used. These documents had, respectively, the record of the moved and vaccinated animals by sex and age group during the analyzed period. The results showed the occurrence of fraud in these livestock records. Therefore, the technic of herd evolution constitutes an important forensic tool, very helpful in combating money laundering through cattle ranching.
Self-Determination, End-of-Life Decisions, and the Role of Nurse Practitioners
Authors: Bradley Heather
Published: February 2015

Nurse practitioners should be aware that societal changes could lead to their being asked to actively assist terminally ill patients who wish to end their lives, as opposed to their current supportive role in palliative care. With physician staff shortages and the need for nurse practitioners to fill the gaps, end-of-life responsibilities could be placed in the hands of nurse practitioners, rather than being reserved for physicians alone (Sagon, 2013). End-of-life matters raise uncertainties about the nurse practitioner role because it differs state by state, relates to ethics, reflects the religious beliefs of those involved, and concerns the conflict of nurses simultaneously caring for their patients while advocating for their right to self-determination in choosing to end their lives.
Why Experience Matters: Moving from Words to Action
Authors: Wolf Jason A.
Published: February 2015

This article explores the nature of patient experience from the perspective of the language we use at a systemic level, discussing the range of terminology that has an impact on how we involve the voices of patients and families in health care today. The author explores the recent evolution in the language of patient experience, acknowledging the diversity of perspective while offering that there is an opportunity for alignment, and presents a model for integrating the constructs that frame excellence in patient experience. The author leaves us with a challenge: to continue the conversation and to find opportunities to elevate the impact of patient experience overall.
Innovating in Health Care Management Education: Development of an Accelerated MBA and MPH Degree Program at Yale
Authors: Pettigrew Melinda M. , Forman Howard P. , Pistell Anne F. , Nembhard Ingrid M.
Published: February 2015

Increasingly, there is recognition of the need for individuals with expertise in both management and public health to help health care organizations deliver high-quality and cost-effective care.

The Yale School of Public Health and Yale School of Management began offering an accelerated Master of Business Administration (MBA) and Master of Public Health (MPH) joint degree program in the summer of 2014. This new program enables students to earn MBA and MPH degrees simultaneously from 2 fully accredited schools in 22 months. Students will graduate with the knowledge and skills needed to become innovative leaders of health care organizations.

We discuss the rationale for the program, the developmental process, the curriculum, benefits of the program, and potential challenges.
A Renewed Vision for Higher Education in Public Health
Authors: Frenk Julio , Hunter David J. , Lapp Ian
Published: February 2015

We are transforming the educational strategy at the Harvard T. H. Chan School of Public Health guided by 5 principles: (1) development of T-shaped competencies (breadth across fields, depth in primary fields), (2) flexible and modular design accommodating different needs through the lifecycle, (3) greater experiential learning, (4) 3 levels of education (informative, formative, and transformative learning), and (5) integrated instructional design (online, in person, and in the field).

We aim to create an arc of education resulting in continuous learning. We seek to bridge the research versus education dichotomy and create research–teaching congruence, adapting the values of peer review and quality assessment that we routinely accept for grant and article review to education.
Comments (January 2001)
Authors: Scott Dillon
Published: February 2015

Editor's column - No abstract available.
3D Vertical Seismic Profiles: A Users' Guide
Authors: Dodds K. , Farmer P.
Published: February 2015

This article is taken from an original manuscript, "3D Vertical Seismic Profiles."
The Viewpoints of El Presidente (January 1999)
Authors: Inciarte Gustavo
Published: February 2015

President's column - No abstract available.
Diagnosis, Treatment Design and Implementation Process Improves Waterflood Conformance
Authors: JPT staff _
Published: February 2015

This article is a synopsis of paper SPE 49201, "Problem Diagnosis, Treatment Design, and Implementation Process Improves Waterflood Conformance," by Tracy Love, SPE, and Andrew McCarty, Chevron U.S.A.; Matthew J. Miller, SPE, Dowell; and Mark Semmelbeck, SPE, Enron, prepared for the 1998 SPE Annual Technical Conference and Exhibition, New Orleans, 27-30 September.
Fields of Vision (February 2000)
Authors: Millheim Keith K.
Published: February 2015

Guest editorial - No abstract available.
Ebughu Field Redevelopment
Authors: Denney Dennis
Published: February 2015

This article is a synopsis of paper SPE 65199, "Case Study: Redevelopment of the Ebughu Field," by R.A. Clark, SPE, A.A. Afemari, T.E. Ezeukwu and H. Awi, Addax Petroleum Development (Nigeria) Ltd., originally presented at the 2000 SPE European Petroleum Conference, Paris, 24-25 October.
Implementation of Twin-Well Technology Offshore Sarawak
Authors: Denney Dennis
Published: February 2015

This article is a synopsis of paper SPE 50082, "Implementation of 'Twin-Well' Technology Offshore Sarawak," by S. Hashim, T. Runggai, M.Z. Khalid, W. Kruit, D. Short, B. Duncan, N. Pauzi, J. Haron, and F.N. Low, Petronas Carigali Sdn. Bhd., originally presented at the 1998 SPE Asia Pacific Oil and Gas Conference and Exhibition, Perth, Australia, 12-14 October.
Evolution of a High Near- Wellbore Pressure-Loss- Treatment Strategy
Authors: Denney Dennis
Published: February 2015

This article is a synopsis of paper SPE 63029, "The Evolution of a High Near-Wellbore Pressure-Loss-Treatment Strategy for the Australian Cooper Basin," by Geoffrey A. Roberts, SPE, and Simon T. Chipperfield, SPE, Santos Ltd., and William K. Miller II, SPE, NSI Technologies Inc., originally presented at the 2000 SPE Annual Technical Conference and Exhibition, Dallas, 1-4 October.
Completion of Large-Bore HP/HT Wells
Authors: Bybee Karen
Published: February 2015

This article is a synopsis of paper OTC 12120, "Completion of Large-Bore High-Pressure/High-Temperature Wells: Design and Experience,"by Alan T. Humphreys, SPE, Elf Exploration U.K. plc, originally presented at the 2000 Offshore Technology Conference, Houston, 1-4 May.
JPT Forum (March 2001)
Authors: JPT staff _
Published: February 2015

JPT Forum - No abstract available.
Operational Experience With Foam-Diverted Acid Jobs in the Gulf of Mexico
Authors: JPT staff _
Published: February 2015

This article is a synopsis of paper SPE 39423, "Operational Experience With Foam-Diverted Acid Jobs in the Gulf of Mexico," by P.H. Morphy, SPE, Shell Offshore Inc., and K.G. Greenwald, SPE, and P.E. Herries, BJ Services, originally presented at the 1998 SPE International Symposium on Formation Damage Control, Lafayette, Louisiana, 18-19 February.
Remedial Acid Treatment for Deepwater Turbidite Sands Containing Zeolite Cement
Authors: JPT staff _
Published: February 2015

This article is a synopsis of paper SPE 39595, "Designing a Remedial Acid Treatment for Gulf of Mexico Deepwater Turbidite Sands Containing Zeolite Cement," by B.A. Rogers, SPE, M.K. Burk, and S.A. Stonecipher, Marathon Oil Co., originally presented at the 1998 SPE International Symposium on Formation Damage Control, Lafayette, Louisiana, 18-19 February.
Integrated Field-Development Planning
Authors: Denney Dennis
Published: February 2015

This article is a synopsis of paper SPE 50154, "Laminaria/Corallina - An Integrated Field-Development Planning Approach," by M.N. Shaw, SPE, J.D. Fowles, S. Abernethy, and R. Hamp, SPE, Woodside Energy Ltd., originally presented at the 1998 SPE Asia Pacific Oil and Gas Conference and Exhibition, Perth, Australia, 12-14 October.
Openhole Horizontal Gravel Pack From a Deepwater TLP
Authors: Denney Dennis
Published: February 2015

This article is a synopsis of paper SPE 50146, "New Completion Techniques Applied to a Deepwater Gulf of Mexico TLP Completion Successfully Gravel Pack an Openhole Horizontal Interval of 2,400 ft," by Pete Duhon, Alan Holley, Nick Gardiner, SPE, and Tommy Grigsby, SPE, Halliburton Energy Services Inc., originally presented at the 1998 SPE Asia Pacific Oil and Gas Conference and Exhibition, Perth, Australia, 12-14 October.
Health, Safety, and Environmental Management: The Client's Role
Authors: Denney Dennis
Published: February 2015

This article is a synopsis of paper SPE 46608, "HSE Management of Geophysical Operations: The Client's Role," by Alan L. Dolezal, SPE, Exxon Exploration Co., originally prepared for presentation at the 1998 SPE International Conference on Health, Safety and Environment in Oil and Gas Exploration and Production, Caracas, 7-10 June.
Polyethylene-Lined Tubing in Rod-Pumped Wells
Authors: JPT staff _
Published: February 2015

This article is a synopsis of paper SPE 39815, "Polyethylene-Lined Tubing in Rod-Pumped Wells," by E.C. Sirgo, SPE, and E.D. Gibson, Chevron U.S.A., and W.E. Jackson, Western Falcon Enterprises, originally presented at the 1998 SPE Permian Basin Oil and Gas Recovery Conference, Midland, Texas, 25-27 March.
Subsurface Equipment/Artificial Lift: Maximizing Production from the Well
Authors: JPT staff _
Published: February 2015

Series sponsored by SPE Foundation.
Brent Gas-Lift Insert-String Completions
Authors: Denney Dennis
Published: February 2015

This article is a synopsis of paper SPE 50585, "Cost-Effectiveness and Flexibility Through the Brent Gas-Lift Insert-String Completions," by J.D. Brakel, I. Taggart, and Z. Bin Yahia, Shell U.K. E&P, originally presented at the 1998 SPE European Petroleum Conference, The Hague, The Netherlands, 20-22 October.
Industry Guidelines for Underbalanced Coiled-Tubing Drilling of Sour Wells
Authors: Bybee Karen
Published: February 2015

This article is a synopsis of paper SPE 54483, "Industry Guidelines for Underbalanced Coiled-Tubing Drilling of Critical Sour Wells, " by H.B. Luft and G. Wilde, SPE, BJ Services, originally presented at the 1999 SPE/ICoTA Coiled Tubing Roundtable, Houston, 25-26 May.
Development and Field Application of a Delayed-Breaker System for Use at High Temperatures
Authors: JPT staff _
Published: February 2015

This article is a synopsis of paper SPE 39780, "Development and Field Application of a Delayed-Breaker System for Use at High Temperatures," by M.G. Much, SPE, and V.L. Franklin, BJ Services Co., originally presented at the 1998 SPE Permian Basin Oil and Gas Recovery Conference, Midland, Texas, 25-27 March.
High-Pressure Coiled Tubing Instrumental in Deepwater Well Work
Authors: JPT staff _
Published: February 2015

This article is a synopsis of paper SPE 54504, "High-Pressure Coiled Tubing Instrumental in Deepwater Well Work," by Henrik A. Larsen, SPE, Dowell; David A. Porter, SPE, BP Amoco plc; and Chad Peterson, SPE, Dowell, originally presented at the 1999 SPE/ICoTA Coiled Tubing Roundtable, Houston, 25-26 May.
Modeling Acid Returns Profiles After HF Acidizing Treatments
Authors: Bybee Karen
Published: February 2015

This article is a synopsis of paper SPE 65035, "Modeling Acid Returns Profiles After HF Acidizing Treatments," by Rick Gdanski, SPE, Halliburton Energy Services Inc., originally presented at the 2001 SPE International Symposium on Oilfield Chemistry, Houston, 13-15 February.
Riser Recoil During Unscheduled Disconnections
Authors: Denney Dennis
Published: February 2015

This article is a synopsis of paper SPE 39296, "Riser Recoil During Unscheduled Lower-Marine-Riser-Package Disconnects," by William F. Puccio and Reid V. Nuttall, Varco Shaffer, originally presented at the 1998 IADC/SPE Drilling Conference, Dallas, 3-6 March.
Foam Cementing Cyclic-Steam, Producing Wells
Authors: JPT staff _
Published: February 2015

This article is a synopsis of paper SPE 46215, "Foam Cementing Cyclic-Steam, Producing Wells: Cymric Field Case Study," by L.S. Miller, SPE, Halliburton Energy Services Inc., and W.E. Frank, SPE, Chevron U.S.A., originally presented at the 1998 SPE Western Regional Meeting, Bakersfield, California, 10-13 May.
Development of a Naturally Fractured Gas-Bearing Granite Reservoir
Authors: Bybee Karen
Published: February 2015

This article is a synopsis of paper SPE 63092, "Integrated Development Plan for a Naturally Fractured Gas- Bearing Granite Reservoir," by W.G. Hazlett, SPE, Gemini Solutions Inc.; P.W. Snow, SPE, Mosbacher Energy Co.; W.D. Von Gonten, SPE, W.D. Von Gonten and Co.; W.M. Glasgow and R.J. Banks, SPE, Mosbacher Energy Co.; and C.S. Duncan, SPE, Worley Intl. Inc., originally presented at the 2000 SPE Annual Technical Conference and Exhibition, Dallas, 1-4 October.
Removing Large Platforms in Deep Water
Authors: Denney Dennis
Published: February 2015

This article is a synopsis of paper OTC 12972, "State of the Art of Removing Large Platforms Located in Deep Water," by Robert C. Byrd and Esau R. Velazquez, Twachtman Snyder & Byrd Inc., originally presented at the 2001 Offshore Technology Conference, Houston, 30 April-3 May.
Reservoir Management Through Horizontal-Well Technology in Algyo Field
Authors: Bybee Karen
Published: February 2015

This article is a synopsis of paper SPE 65495, "Reservoir Management Through Horizontal Well Technology in Algyo Field," by G. Palasthy, SPE, MOL Co., S.D. Joshi, SPE, JTI, and L. Benedek, SPE, P. Kristof, SPE, and V. Pipicz (Werovszky), SPE, MOL Co., originally presented at the 2000 SPE/CIM International Conference on Horizontal Well Technology, Calgary, 6-8 November.
Linking Asset Tracking to Per formance Improvements in Oilfield Operations
Authors: Denney Dennis
Published: February 2015

This article is a synopsis of paper SPE 70002, "A Web-Based System To Link Asset Tracking to Performance Improvements in Oilfield Operations," by M. Steven Slezak, SPE, and Floyd Prather, Case Services Inc., originally presented at the 2001 SPE Permian Basin Oil and Gas Recovery Conference, Midland, Texas, 15-16 May.
Elongation of Coiled Tubing During Its Life
Authors: JPT staff _
Published: February 2015

This article is a synopsis of paper SPE 38408, "Elongation of Coiled Tubing During Its Life," by K.R. Newman, SPE, Coiled Tubing Engineering Services, L. C., U.B. Sathuvali, SPE, Arco, and S. Wolhart, SPE, Gas Research Inst., originally presented at the 1997 SPE/ICoTA North American Coiled Tubing Roundtable held in Montgomery, Texas, 1-3 April.
Drilling Optimization and Use of a Titanium Motor Reduce Short-Radius-Drilling Time
Authors: JPT staff _
Published: February 2015

This article is a synopsis of paper SPE 39387, "Drilling Optimization and Use of Titanium Motor Results in 40% Reduction in Short-Radius-Drilling Time," by Michael R. French, SPE, and Mangojak Siagian, PT Caltex Pacific Indonesia, and Brod C. Sutcliffe, SPE, and Jerry Jones, Baker Hughes Inteq, originally presented at the 1998 IADC/SPE Drilling Conference, Dallas, 3-5 March.
Accurate Oil-Saturation Determination and Monitoring
Authors: Denney Dennis
Published: February 2015

This article is a synopsis of paper SPE 46245, "Accurate Oil-Saturation Determination and Monitoring in a Heavy-Oil Reservoir," by Paul Harness, SPE, and Noel Shotts, SPE, Texaco E&P Inc.; Jim Hemingway and David Rose, GeoQuest; and Roy van der Sluis, SPE, Schlumberger Wireline and Testing, originally presented at the 1998 SPE Western Regional Meeting, Bakersfield, California, 10-13 May.
Foamy-Oil Effect in Laboratory Experiments
Authors: Denney Dennis
Published: February 2015

This article is a synopsis of paper SPE 54083, "Investigation of Foamy-Oil Effect From Laboratory Experiments," by D. Urgelli, SPE, M. Durandeau, SPE, H. Foucault, and J-F. Besnier, Total, originally presented at the 1999 SPE International Thermal Operations and Heavy Oil Symposium, Bakersfield, California, 17-19 March.
Thermally Compensated Inflatable Packers and Plugs
Authors: Bybee Karen
Published: February 2015

This article is a synopsis of paper SPE 59139, "Zonal Isolation in Stimulation Treatments and Gas/Water Shutoff Using Thermally Compensated Inflatable Packers and Plugs," by Paul Wilson and Corey E. Hoffman, SPE, Weatherford, originally presented at the 2000 IADC/SPE Drilling Conference, New Orleans, 23-25 February.
Wired BHA for Underbalanced Coiled-Tubing Drilling
Authors: Denney Dennis
Published: February 2015

This article is a synopsis of paper IADC/SPE 59161, "Wired BHA Applications in Underbalanced Coiled- Tubing Drilling," by Scott K. Tinkham, SPE, Dale E. Meek, SPE, Timo W. Staal, SPE, Schlumberger Oilfield Services, originally presented at the 2000 IADC/SPE Drilling Conference, New Orleans, 23-25 February.
Practical Guidelines for Field Remediation of Gas Hydrates
Authors: Bybee Karen
Published: February 2015

This article is a synopsis of paper SPE 69424, "Problems in Gas Hydrates: Practical Guidelines for Field Remediation," by J.E. Paez, Dalhousie U.; R. Blok, Martec Ltd.; and H. Vaziri, SPE, and M.R. Islam, SPE, Dalhousie U., originally presented at the 2001 SPE Latin American and Caribbean Petroleum Engineering Conference, Buenos Aires, 25-28 March.
Effect of Pore-Fluid Type on Per foration Damage and Flow Characteristics
Authors: Denney Dennis
Published: February 2015

This article is a synopsis of paper SPE 67290, "Effect of Pore Fluid Type on Perforation Damage and Flow Characteristics," by C. Ozgen Karacan, SPE, Abraham S. Grader, SPE, and Phillip M. Halleck, SPE, Pennsylvania State U., originally presented at the 2001 SPE Production and Operations Symposium, Oklahoma City, Oklahoma, 24-27 March.
Comments (October 1998)
Authors: Bilich Georgeann
Published: February 2015

Editor's column - No abstract available.
Designing Tomorrow's Compact Separation Train
Authors: Bybee Karen
Published: February 2015

This article is a synopsis of paper SPE 56644, "Designing Tomorrow's Compact Separation Train," by K.E. Arnold, SPE, and P.L. Ferguson, Paragon Engineering Services Inc., originally presented at the 1999 SPE Annual Technical Conference and Exhibition, Houston, 3-6 October.
Measurement of Filter-Cake Mechanical Properties
Authors: Bybee Karen
Published: February 2015

This article is a synopsis of paper SPE 68948, "Measurement of the Mechanical Properties of Filter Cakes," by P. Cerasi, SINTEF Petroleum Research; H.K. Ladva, SPE, Schlumberger Cambridge Research; A.J. Bradbury, SPE, M-I LLC; and K. Soga, U. of Cambridge, originally presented at the 2001 SPE European Formation Damage Conference, The Hague, 21-22 May.
Field Test of a Full-Scale Dual-Gradient Drilling System
Authors: Bybee Karen
Published: February 2015

This article is a synopsis of paper SPE 71358, "Subsea Mudlift Drilling: Planning and Preparation for the First Subsea Field Test of a Full-Scale Dual Gradient Drilling System at Green Canyon 136, Gulf of Mexico," by J.P. Schumacher, SPE, J.D. Dowell, SPE, and L.R. Ribbeck, SPE, Texaco Inc., and J.C. Eggemeyer, Conoco Inc., originally presented at the 2001 SPE Annual Technical Conference and Exhibition, New Orleans, 30 September- 3 October.
Rule-Induction Algorithm for Multidisciplinary Data
Authors: Denney Dennis
Published: February 2015

This article is a synopsis of paper SPE 68818, "A Rule-Induction Algorithm for Application to Petrophysical, Seismic, Geological, and Reservoir Data," by Clayton V. Deutsch and YuLong Xie, U. of Alberta, and A. Stan Cullick, Landmark Graphics, originally presented at the 2001 SPE Western Regional Meeting, Bakersfield, California, 26-30 March.
Continuous Management and Learning Applied to Standard Deepwater Subsea Systems
Authors: Denney Dennis
Published: February 2015

This article is a synopsis of paper OTC 13119, "Delivering World-Class Uptime - Continuous Management and Learning as Applied to Standard Deepwater Subsea Systems," by F.M. Pattee, SPE, Shell Intl. E&P Inc. - Deepwater Services, originally presented at the 2001 Offshore Technology Conference, Houston, 30 April-3 May.
Flow Assurance Challenges for Wet and Dry Tree Systems in Ultradeep Water
Authors: Denney Dennis
Published: February 2015

This article is a synopsis of paper SPE 71545, "A Tale of Two Trees: Flow Assurance Challenges for Wet Tree and Dry Tree Systems in Ultradeep Water," by T.S. Golczynski, SPE, and V.G. Niesen, SPE, Multiphase Solutions Inc., originally presented at the 2001 SPE Annual Technical Conference and Exhibition, New Orleans, 30 September-3 October.
Validation of Drill-In Fluid Cleanup System Effectiveness
Authors: JPT staff _
Published: February 2015

This article is a synopsis of paper SPE 38570, "Field Experience Validates Effectiveness of Drill-In Fluid Cleanup System," by B.B. Beall, SPE, R. Tjon-Joe-Pin, SPE, and H.D. Brannon, SPE, BJ Services Co. U.S.A., originally presented at the 1997 SPE Annual Technical Conference and Exhibition held in San Antonio, Texas, 5-8 October.
Significance of Project Risking Methods on Portfolio Optimization Models
Authors: Denney Dennis
Published: February 2015

This article is a synopsis of paper SPE 69594, "Significance of Project Risking Methods on Portfolio Optimization Models," by P.A. Tyler, SPE, Schlumberger GeoQuest, and J.R. McVean, Merak Projects, originally presented at the 2001 SPE Latin American and Caribbean Petroleum Engineering Conference, Buenos Aires, Argentina, 25-28 March.
How Well Is the Reservoir Connected?
Authors: Denney Dennis
Published: February 2015

This article is a synopsis of paper SPE 38560, "How Well Connected Is the Schiehallion Reservoir?" by S.M. Richardson, N. Herbert, and H.M. Leach, BP Exploration, originally presented at the 1997 SPE Offshore Europe Conference, Aberdeen, 9-12 September.
Numerical Prediction of Hydrodynamic Conditions in one Strand Tundish. Influence of Thermal Conditions and Casting Speed/ Numeryczna Prognoza Warunków Hydrodynamicznych W Jednozyłowej Kadzi Posredniej. Wpływ Warunków Cieplnych I Predkosci Odlewania
Authors: Cwudzinski A.
Published: February 2015

This paper reports the results of computer simulations of the flow of liquid steel in a single-nozzle tundish, which describe the flow hydrodynamics, depending on the thermal conditions and casting speed. In this paper, five casting speeds, namely 0.3, 0.6, 0.9, 1.2 and 1.5 m/min., have been examined. In view of the fact that tundishes are being equipped with various flow control devices and the process of creating specific hydrodynamic conditions is influenced also by the temperature gradient, computer simulations of liquid steel flow under isothermal and non-isothermal conditions were performed. Computer simulations of liquid steel flow were performed using the commercial program Ansys-Fluent ®. In order to explain the phenomena occurring in the tundish working space, the buoyancy number (Bu) has been calculated. The next research step in the analysis of the flow pattern forming in different casting conditions was to record the E and F-type RTD characteristics and to describe the pattern of flow.
Microstructure and Mechanical Properties of Dual-Phase Steel/ Mikrostruktura I Własności Mechaniczne Stali Dwufazowej
Authors: Miernik K. , Pytel S.
Published: February 2015

The paper presents results of microstructure and mechanical properties of the dual phase (DP) steel plate with 12 mm thickness produced by intercritical annealing at a two-phase region of ferrite and austenite (α + γ) and direct quenching in water. In addition the tempering treatment at temperature of 650°C was applied to investigate effect of martensite softening on mechanical properties of the tested steel. The parameters of heat treatment were designed to achieve the high strength while retaining optimum impact strength of the DP steel.
Tribological Properties of Steel/Tib2 Composites Prepared by Spark Plasma Sintering/ Własności Tribologiczne Kompozytów Stal/Tib2 Otrzymywanych Metodą Sps
Authors: Sulima I.
Published: February 2015

mechanical and tribological properties of sintered 316L stainless steel composites with TiB2 submicroparticles were investigated. The composites were manufactured by Spark Plasma Sintering (SPS). The wear behaviour was studied by using a ball-on-disc wear tester at room temperature. The worn surface were analysed using Scanning Electron Microscopy (SEM). The results indicated that the friction coefficient and the wear resistance of composites with the same content of TiB2 particles depend on the sintering conditions.
Effect of Heat Treatment Conditions on the Morphology of α Phase and Mechanical Properties In Ti-10V-2Fe-3Al Titanium Alloy/ Wpływ Warunków Obróbki Cieplnej Na Morfologie Fazy α I Własności Mechaniczne W Stopie Tytanu Ti-10V-2Fe-3Al
Authors: Bogucki R. , Mosór K. , Nykiel M.
Published: February 2015

The influence of heat treatment on the microstructure and mechanical properties was studied in the Ti-10V-2Fe-3Al titanium alloy for two heat treatment schemes (α + β) and β + (β + α), which resulted in different morphologies of the α phase. Scheme I resulted in the α-phase of globular morphology, whose volume fraction did not change much during annealing. Scheme II led to obtaining a needle-like α-phase, whose amount increased together with heating time. The phenomenon of stress-induced martensitic transformation was observed in the material with needle-like morphology annealed for 15 and 30 min. Longer times of annealing effected in the decay of that transformation, provided the volume fraction of α-phase exceeded 50%.
Fabrication and Cold Drawing of Copper Covetic Nanostructured Carbon Composites/ Otrzymywanie Oraz Ciągnienia Kompozytów Miedzianych Typu Covetic O Strukturze Nanometrycznej
Authors: Knych T. , Kiesiewicz G. , Kwasniewski P. , Mamala A. , Smyrak B. , Kawecki A.
Published: February 2015

This paper presents the research results of copper Covetic metallurgical synthesis along with the characterization of cast material and the processing of casts into wires. The Cu-C composite production method was based on patent applications of Third Millennium Metals. Obtained materials were tested for their chemical composition (including Secondary Ion Mass Spectrometry (SIMS) analysis for carbon presence), mechanical properties and electrical conductivity. Measurements were also performed for wires which were first cut from obtained casts and next cold drawn into final wire form. Produced wires were tested for their mechanical and electrical properties. Electrical conductivity of wires was measured with the use of high precision Thompson’s- Kelvin’s bridge type device. A key objective of the research was to determine if Covetic copper has higher electrical conductivity than pure oxygen free copper.
Processing, Microstructure and Properties of Different Method Obtained Cu-Al2O3 Composites/ Wytwarzanie, Mikrostruktura I Właściwości Kompozytów Cu-Al2O3 Otrzymywanych Róznymi Technikami
Authors: Strojny-Nedza A. , Pietrzak K.
Published: February 2015

Alumina/copper composites are used where high thermal conductivity, high absorption and dissipation of heat, high resistance to thermal fatigue and good frictional wear resistance are required. The properties of these composites depend on a number of factors including the content, shape and distribution of the ceramic phase, the method of their obtaining, as well as the conditions under which they are obtained. All these variables have influence on mentioned properties and, in consequence, on the future applications of the final material. The aim of this paper was to develop Cu-Al2O3 composites, processed using two techniques, namely sintering (of Cu /Al2O3 high-energy mixed powders) and tape casting (of slurry of the following composition: 1, 3 and 5 vol.% of Al2O3 phase; the remaining part: Cu). The compositions were determined taking into consideration the planned applications. The paper presents newly developed technologies, the results of both microstructure investigations as well as of the measurements of selected physical and mechanical properties (microhardness, wear resistance, thermal conductivity etc.) and contains the analysis of the influence of selected techniques and processing conditions on the properties and the interface morphology between ceramic and copper
Detonation-Sprayed Wc-12%Co and Wc-17%Co Diamond-Impregnated Segments/ Natryskiwanie Detonacyjne Powłok Wc-12%Co I Wc-17%Co Na Spieki Metaliczno-Diamentowe
Authors: Borowiecka-Jamrozek J.
Published: February 2015

This paper presents results of investigations of WC-12%Co and WC-17%Co coatings detonation sprayed on a sintered cobalt substrate.

The main objective of the present work was to establish a new production route of sandwich type diamond-impregnated segments for circular sawing of stone and other construction materials.

Unalloyed cobalt was chosen as the substrate material. Prior to coating the specimens were made by means of hot pressing of Extrafine cobalt powder in a graphite mould.

The segments were then coated with WC-Co. The effects of the coating process on the thickness, microhardness, microstructure and wear resistance of the deposits were investigated.

The properties of the coatings were established by performing the following tests: a microstructure analysis, a point analysis of chemical composition and a linear analysis, a phase composition, a microhardness tests and abrasion resistance.
New Features of Entall Database: Comparison of Experimental and Model Formation Enthalpies/ Nowe Funkcje Bazy Danych Entall: Porównanie Doświadczalnych I Modelowych Entalpii Tworzenia
Authors: Debski A. , Debski R. , Gasior W.
Published: February 2015

This paper presents a new version of the Entall database of the thermodynamic properties of metals and their alloys. The changes are related to the thermodynamic data of new binary and ternary systems as well as the integration of the database with an application for the modeling of the formation enthalpies of intermetallic phases with the use of the Miedema model. Using this tool, calculations of the enthalpies of formation of 38 intermetallic phases from 12 binary systems were performed and a comparative analysis conducted. The results of the analysis clearly showed a weak correlation between the model and experimental data. To improve this correlation, an intermediate method of proportional change was proposed, on the basis of the measurement of the enthalpy of formation for one of the phases. The values for the other phases obtained from this indirect method should not deviate much from the experimental ones provided that before the measurements (dissolving or pulping) or after them (direct synthesis), the phase being examined should undergo structural tests, in order to confirm its dominating amount in the samples.
Mechanical Properties of Vm12 Steel after 30 000 Hrs of Ageing at 600°C Temperature/ Właściwości Mechaniczne Stali Vm12 Po 30 000 Godzin Starzenia W Temperaturze 600°C
Authors: Golanski G. , Zielinski A. , Słania J. , Jasak J.
Published: February 2015

The paper describes the influence of different times of ageing on mechanical properties and microstructure stability in hardened and tempered VM12 steel exposed to service temperature - 600°C. Detailed microstructural and microchemical analysis of secondary phases was carried out using scanning electron microscopy (SEM + EDX) and X-ray phase analysis of carbide isolates. Performed research has proved high stability of strength properties of the investigated steel, which is connected with the lath stability of the microstructure of tempered martensite. Slight changes in strength properties were accompanied by over 50% reduction in impact strength KV of the examined cast steel, from the level of 83 J in the as-received condition to 38 J after 30 000 hrs of ageing at the temperature of 600°C. Significant decrease in impact energy KV of VM12 steel results from the growth of the amount and size of precipitations on grain boundaries.
Kinetics of the Fluidised Oxidation of Zinc Sulphide Concentrates with an Addition of Inert Materials/ Kinetyka Fluidalnego Utleniania Siarczkowych Koncentratów Cynku Z Dodatkiem Materiałów Obojętnych
Authors: Jarosz P. , Małecki S.
Published: February 2015

This paper presents the results of the kinetic studies of the zinc sulfide concentrate oxidation with the addition of inert, ZnO-containing materials. It was observed that about 15% of zinc oxide addition, obtained from steelmaking dust, improves the rate and maximum degree of oxidation of the concentrate. Kinetic equations of the process were determined, and the activation energy for various additions of inert material was calculated
Fabrication and Microstructure of Diffusion Alloyed Layers on Pure Magnesium Substrate/ Wytwarzanie I Struktura Dyfuzyjnych Stopowych Warstw Na Magnezie
Authors: Mola R.
Published: February 2015

Alloyed layers on pure magnesium were created by means of the heating of the magnesium sample covered with Al+Zn powders mixture containing 20 wt.% Zn and 40 wt.% Zn in vacuum furnace. The microstructure and related composition of the alloyed layers were investigated using optical microscopy and scanning electron microscopy equipped with an energy dispersive X-ray system (EDS). The results revealed that the microstructure, thickness and microhardness of the obtained layers depended on the Zn content in the powder mixture. The alloyed layers were composed of the Mg-Al-Zn intermetallic phases and Mg-based solid solution containing Al and Zn. The multi-phase layer was diffusion bonded with magnesium substrate. The thickness of the layer fabricated by the heat treatment in contact with a powder mixture containing 40 wt.% Zn was twice as high as compared to that obtained with the powder mixture containing 20 wt.% Zn. The hardness value of the alloyed layers was much higher than that of the magnesium substrate.
Welding Effects on the Mechanical Integrity of a Trip800 Steel: a Comparison of Laser Co2 and Gmaw Processes/ Wpływ Spawania Na Integralność Mechaniczna Stali Trip800: Porównanie Spawania Laserowego Ze Spawaniem Elektrodą Topliwą
Authors: Perez-Medina G.Y. , Lopez H.F. , Reyes-Valdés F.A. , Garza-Gomez A. , López-Ochoa Luis M.
Published: February 2015

In this work a strip of a transformation induced plasticity (TRIP) steel was welded using gas metal arc welding (GMAW) and Laser CO2 welding (LBW) processes and the resultant strength and ductility of the welded joints evaluated. It was found that LBW lead to relatively high hardness in the fusion zone, FZ where the resultant microstructure was predominantly martensite. The relative volume fractions of phases developed in the welded regions were quantitatively measured using color metallography combined with X-ray diffraction analyses. It was found that the heat affected zone, HAZ developed the maximum amount of martensite (up to 32%) in the steel welded using LBW besides a mixture of bainite, retained austenite and ferrite phases. In contrast, a relatively low percent of martensite (10.8%) was found in the HAZ when the GMAW process was implemented.
The Change of Liquid Steel Flow Control System in the Tundish – Modelling Research/ Zmiana Systemu Kontroli Przepływu Ciekłej Stali W Kadzi Pośredniej – Badania Modelowe
Authors: Pieprzyca J. , Merder T. , Saternus M. , Kania H.
Published: February 2015

The article presents the results of research concerning the change of liquid steel flow and mixing in the T-type tundish. It has been installed in one of polish steel plants. Continuously changing market conditions have forced the change in the range of cast strand. As a consequence the new control system of liquid steel flow had to be applied. Up to now a baffle with notch has played the role of steel flow regulation. It was placed between the inlet and channel zones of a tundish. However such solution was not satisfactory. Therefore, a new flow control equipment was designed - baffles and different constructional variants of turbulence inhibitors. To estimate the efficiency of their functioning and in the same time their influence on the tundish work, modelling research was carried out. The research was also complemented by numerical simulations. The article presents results of such research as well as experimentally and numerically determined RTD curves of mixing (Residence Time Distribution).
Application of X-Ray Microtomography and Optical Microscopy to Determine the Microstructure of Concrete Penetrated by Carbon Dioxide/ Zastosowanie Mikrotomografii Komputerowej I Mikroskopii Optycznej Do Oceny Mikrostruktury Betonów Poddanych Działaniu Co2
Authors: Ranachowski Z. , Józwiak-Niedzwiedzka D. , Ranachowski P. , Rejmund F. , Dabrowski M. , Kudela S. , Dvorak T.
Published: February 2015

In the paper two advanced methods for testing cement based composites are described and compared. These are X-ray microtomography and optical microscopy. Microtomography supplies three-dimensional images of small concrete specimens. In the tomograms all cracks, pores and other voids and inclusions, that exceed a few micrometers, are shown. Such visualisation can become a valuable tool for analysis of the basic material properties. Images obtained on thin sections and analysed with various methods on optical microscopes supply additional information on material microstructure that cannot be obtained in tomograms. For example it is relatively easy to determine zone penetrated by CO2 ingress. These two methods, presented on examples of tests, complete each another in order to supply a set of information on composition and defects of tested composite materials.
Analysis of Am60 and Az91 Alloy Crystallisation in Ceramic Moulds by Thermal Derivative Analysis (Tda)/ Analiza Krystalizacji Stopów Am60 I Az91 W Formie Ceramicznej Metodą Analizy Termiczno-Derywacyjnej (Atd)
Authors: Rapiejko C. , Pisarek B. , Czekaj E. , Pacyniak T.
Published: February 2015

The work presents the test results of the crystallisation and cooling of magnesium alloys: AM60 and AZ91, with the use of the TDA method. The tested alloys were cast into ceramic shells heated up to 180°C, produced according to the technology of the shell production in the investment casting method. The TDA method was applied to record and characterize the thermal effect resulting from the phase transformations occurring during the crystallisation of magnesium alloys. The kinetics and dynamics of the thermal processes of the crystallisation of AM60 and AZ91 in the ceramic shells were determined. Metallographic tests were performed with the use of an optical microscope as well as scanning microscopy, together with the EDS chemical analysis of the phases present in the tested casts. A comparison of these test results with the thermal effect recorded by way of the TDA method was made.
Thermodynamic Description of Ternary Fe-B-X Systems. Part 3: Fe-B-Mn/ Opis Termodynamiczny Trójskładnikowych Układów Fe-B-X. Część 3: Fe-B-Mn
Authors: Miettinen J. , Lilova K. , Vassilev G.
Published: February 2015

A thermodynamic optimization of the ternary Fe-B-Mn system is presented. The thermodynamic parameters of the binary sub-systems, Fe-Mn, Fe-B and B-Mn, are taken from earlier assessments slightly modifying the B-Mn system description. The thermodynamic parameters of the Fe-B-Mn system are optimized in this study using literature experimental thermodynamic and phase equilibrium data. The solution phases of the system are described using the substitutional solution model and the borides are treated as stoichiometric or semi-stoichiometric phases of the (A,B)pCq type described with the two-sublattice models.
Wear Resistant Chromium Coatings Modified with Diamond Nanoparticles/ Odporność Na Zużycie Ścierne Powłok Chromowych Modyfikowanych Nanocząstkami Diamentu
Authors: Gidikova N. , Cias A. , Petkov V. , Madej M. , Sułowski M. , Valov R.
Published: February 2015

Electrochemical chromium coatings on steel, modified with diamond nanoparticles (NDDS), were produced by detonation synthesis. Their particle size was from 10 to 50 nm. Galvanization conditions, current density, etc., concentration of NDDS, were studied in relation to the characteristics of the chromium coatings. The optimal conditions were determined to attain the maximal values of the physical and mechanical properties of the coating. Surface topography after wear testing was examined. Compared to unmodified chromium coating, microhardness of the surface increased to 1100 kg/mm2, wear resistance, expressed as % of mass loss, increased from 3 to 10 times.
Effect of Mould Components on the Cooling Rate, Microstructure, and Quality of We43 Magnesium Casting Alloy/ Wpływ Zastosowanych Elementów Formy Na Szybkość Chłodzenia, Mikrostrukturę I Jakość Stopu Magnezu We43
Authors: Dybowski B. , Kiełbus A. , Jarosz R.
Published: February 2015

We investigated the impact of the applied cooling and feeding method on the microstructure and metallurgical quality of castings made from WE43 magnesium alloy. Six identical plates with dimensions of 100x50x20 mm were sand cast for use as samples. Each casting was fed and cooled in a different way. The solid solution grain size was evaluated quantitatively using the Met-Ilo software program, and casting defects were observed using a scanning electron microscope Hitachi S3400N. The finest solid solution grain was observed in the castings with only the coolers applied. Non-metallic inclusions were observed in each plate. The smallest shrinkage porosity was observed in the castings with feeders applied.
Microstructural Characterization of Several Coatings Deposited on Tialnb Intermetallic Alloy/ Charakterystyka Mikrostruktury Wybranych Warstw Wytworzonych Na Podłożu >Stopu Tytanu Na Osnowie Fazy Międzymetalicznej Tialnb
Authors: Góral M. , Pytel M. , Dychton K.
Published: February 2015

Titanium alloys based on the γ -TiAl intermetallic phase are a type of material which may replace nickel supperalloys in high temperature applications. Not enough resistance to corrosion at temperatures above 900°C remains the biggest limitation in industrial practices.

The paper presents results of preliminary research into application of new type heat resistant coatings on the basis of γ -TiAl alloy. MeCrAlY and Si coatings were formed by pack cementation method. Aluminide coatings were deposited by pack cementation method and VPA. Research results have shown that except for the coating formed by VPA, coatings were characterized by high porosity and therefore would not ensure appropriate protection against oxidation. Further research will be necessary into application of the VPA method in protecting γ-TiAl titanium alloys in order to improve their heat resistance.
Impact of a Structure on Durability of Modified Nickel-Base Superalloys in Creep Conditions/ Wpływ Struktury Na Trwałość W Warunkach Pełzania Modyfikowanych Nadstopów Na Bazie Niklu
Authors: Ciesla M. , Manka M. , Gradon P. , Binczyk F.
Published: February 2015

The study assesses the impact of surface and bulk modification and filtration during pouring on a durability under accelerated creep conditions of casts made of IN-713C and MAR-247 nickel superalloys scrap used for manufacturing of aircraft engine parts. The impact of solutionizing (1185°C/2 h) with subsequent ageing (870°C/20 h) on the creep resistance of a casting made from MAR-247 coarse-grained superalloy was also examined. Morphological structure parameters were determined with the use of Met-Ilo software. Macrostructure analysis of casts showed very significant impact of surface modification treatment. Creep test results clearly showed that coarse grained samples of IN-713C and MAR-247 superalloys have higher creep resistance. Moreover alloy MAR-247 had higher creep durability after heat treatment compared to as-cast state.
Analysis of Bimetallic Plate Rolling after Explosive Welding/ Analiza Procesu Walcowania Blach Bimetalowych Po Połączeniu Metoda Zgrzewania Wybuchowego
Authors: Wypart J. , Rydz D. , Stradomski G. , Dyja H.
Published: February 2015

This work presents the effect of plastic deformation and heat treatment on the properties of joint area of AL99,8 + M1E bimetallic plate. The joining zones were analyzed after rolling in three variants: directly after joining, after joining and annealing at 300°C, and after joining and annealing at 400°C.
Thermal Properties of Various Ti-Al-C Composites Prepared by Hot Shock Compaction Utilizing Combustion Synthesis/ Właściwości Termiczne Kompozytów Ti-Al-C Uzyskanych Z Wykorzystaniem Metody Udarowego Zagęszczania Na Gorąco
Authors: Tomoshige R. , Tanaka H.
Published: February 2015

Hot shock compaction method was utilized for the consolidation of MAX phase composites consisting of Ti, Al and C. This paper presents the production of dense, crack-free composites by combining the combustion synthesis with explosive detonation. Another objective is to investigate various properties of the obtained shock-compacts. The shock compacted materials were post-annealed at 1173 K for releasing the shock-induced strain. As a result, these compacts had strong interparticle bonding strength and few macro cracks. Intermetallic compounds (TiAl, Ti2Al and Ti3Al) and non-oxide ceramics (TiC and Ti4Al2C2) were detected in as-synthesized and annealed materials by X-ray diffraction experiments. Also, lamella structures of Ti4Al2C2 phase were observed by SEM. It was known that the coefficient of thermal expansion increased with increasing temperature, and decreased with increasing TiC content.
Calculation and Cladding of Profiled Surface of the Superconducting Coil Pf1 Iter Contacts/ Obliczenia I Platerowanie Powierzchni Profilowych Styków Cewek Nadprzewodnikowych Pf1 Iter
Authors: Vakin V. , Krasilnikov A. , Marushin Y.
Published: February 2015

The purpose of this work is obtaining in practice a bimetallic blank with a metal mating surface different from the flat shape, to be used for manufacturing of contacts in a superconducting coil of the experimental thermonuclear experimental reactor ITER.