bluuebunny/crossref_metadata_2025_split huggingface dataset:
Agentes Crioprotectores Alternativos para el Congelamiento Lento de Espermatozoides Epididimarios de Alpaca (Vicugna pacos)
Authors: Canorio Pariona Nadia , Paredes Arnedo Fernando , Valdivia Cuya Martha 
Published: January 2016

<p>El objetivo del estudio fue utilizar agentes crioprotectores alternativos para el congelamiento lento de espermatozoides epididimarios de alpaca (<em>Vicugna pacos</em>). Epidídimos obtenidos en el camal de la ciudad de Huancavelica fueron transportados a 4 °C en solución fisiológica al laboratorio en Lima, Perú. Los espermatozoides fueron extraídos de la cola del epidídimo e incubados en medio HAMF10 a 37 °C. Se usó el medio Tes-Tris-Yolk como medio de criopreservación y suplementado con los agentes crioprotectores dimetilsulfóxido (Me2SO4) en concentraciones de 0.5, 0.25 y 0.125M y dimetilacetamida (DMA) en concentraciones de 0.75, 0.385 y 0.18M, y comparados con el grupo control criopreservado con glicerol 0.6M. Se evaluó la motilidad, viabilidad e integridad de membrana antes y después del congelamiento. Se obtuvo una mejor viabilidad e integridad de membrana posdescongelamiento con DMA 0.375M (p&lt;0.05). La motilidad fue mejor en los grupos de Me2SO4 0.25 y 05M y de DMA 0.375 y 0.75M (p&lt;0.05).</p>
Controllable growth of layered selenide and telluride heterostructures and superlattices using molecular beam epitaxy
Authors: Vishwanath Suresh , Liu Xinyu , Rouvimov Sergei , Basile Leonardo , Lu Ning , Azcatl Angelica , Magno Katrina , Wallace Robert M. , Kim Moon , Idrobo Juan-Carlos , Furdyna Jacek K. , Jena Debdeep , Xing Huili Grace 
Published: January 2016

Abstract
Editorial
Authors: Costa Lucia De Fátima Lúcio Gomes da 
Published: January 2016

Caros leitores,

O segundo volume de 2015 traz sete textos a respeito de estudos aplicados sobre as áreas de Negócios, Gestão Pública e Tecnologia da Informação. O primeiro deles explora o processo de alinhamento estratégico dos projetos de TI de uma Universidade privada e demonstra como ocorre a priorização dos projetos em relação aos objetivos estratégicos da instituição.
Também tendo como objeto uma instituição de ensino, um dos artigos apresenta uma investigação sobre os fatores que influenciam na escolha dos alunos, envolvendo questões relacionadas à gestão pública.
Ainda sob a perspectiva da gestão pública, a terceira investigação explora aspectos relativos a fatores motivacionais na prestação do serviço público de saúde, por meio de um estudo de caso.
Há ainda uma pesquisa exploratória sobre extração automática de conhecimento que avalia a efetividade de ferramentas na captura de aspectos relacionados às dimensões ambiental, social e econômica em projetos sustentáveis.
Seguindo sob a ótica da eficiência, apresentamos um estudo cujo objetivo é verificar quais indicadores de gestão têm influência significativa no resultado econômico do IFRN, por meio de uma abordagem de Contabilidade de Custos e resultados econômicos.
Apresentamos ainda uma análise em sites eletrônicos oficiais e portais da transparência para verificar a adequação das informações disponibilizadas na internet com os critérios estabelecidos na Lei de Acesso à Informação.
Por último, apresentamos uma análise como da cadeia de valor do ágar-ágar à luz da competitividade internacional, por meio de um mapeamento da cadeia de valor do processo produtivo e das relações de sinergias entre os atores da cadeia produtiva dos hidrocolóides.
Essas investigações traduzem um esforço da construção de pesquisa aplicada com ricas contribuições para a pesquisa do ponto de vista teórico, metodológico e socioeconômico.

Espero que apreciem. Boa Leitura!
A ARTE DE FABRICAR MOTINS: OS MARCOS REGULATÓRIOS DA MINERAÇÃO DIAMANTÍFERA EM PERSPECTIVA HISTÓRICA
Authors: Martins Marcos Lobato 
Published: January 2016

O artigo, apoiado na historiografia existente e fontes locais (depoimentos de garimpeiros e jornais diamantinenses), discute as alterações do arcabouço legal que regia a mineração no Brasil, enfatizando a situação dos garimpeiros de diamantes na região do Alto Jequitinhonha, Minas Gerais. São abordadas as relações entre garimpeiros, donos de terras, empresas mineradoras e governo, com o objetivo de mostrar as contradições entre eles e as dificuldades postas pela legislação para o desenvolvimento do garimpo.Palavras-chave: legislação minerária, garimpo, diamante, Minas Gerais. Abstract: This paper, supported in historical production and local sources (newspapers and prospectors testimonies), examines the changes of brazilian’s mining legislation, emphasizing the diamond prospectors situation in Upper Jequitinhonha region, Minas Gerais. It approaches the relations between prospectors, land proprietaries, mining enterprises and governments, with the intent to exhibit the contradictions between them and difficulties in the mining development caused by legislation.Key words: mining legislation, prospecting, diamond, Minas Gerais.
A ORIGEM DOS FILITOS HEMATÍTICOS DA SERRA DO ESPINHAÇO MERIDIONAL, MINAS GERAIS
Authors: Knauer Luiz Guilherme , Schrank Alfonso 
Published: January 2016

This work present stratigraphic, mineralogical and geochemistry dates about the “hematitic phyllites” of the Espinhaço Range, specially in its meridional portion. For these rocks, composed essencially by sericite/muscovite and hematite and very poor in quartz, many investigators have suggested an origin from a low grade metamorphism of some unique igneous rocks.Typical of the “Guinda Group”, basal portion of the Espinhaço Supergroup, with Paleo/Mesoproterozoic age (1.7 – 1.75 G.y.), the hematitic phyllites presents an interesting chemistry composition, characterized by 35,4% SiO2, 5,4% TiO2, 23,2% Al2O3; 25,3% FeO, 0,1% MnO, 1,5% MgO, 0,5% CaO, 0,3% Na2O; 7,9% K2O and 0,4% P2O5. These numbers shows, clearly, alteration processes.The evolutive aspects of the Espinhaço Supergroup put constraints that indicate one of the follow processes: modification from fluid percolation in shear zones or superficial alteration processes in atmosphere- lithosphere boundary. The present studies show that the last alternative (superficial processes) is more feasible to explain the characteristics of the hematitic phyllites.Thus, we believe that these rocks are paleoregolith/paleosols ( from Paleo/Mesoproterozoic) specially origined from the basalts of the “Espinhaço Basin” opening. Associated rocks with so much chloritoid (90.0%) are, probably, paleobauxities with variable iron content.
O CONGLOMERADO SAMBURÁ (GRUPO BAMBUÍ, NEOPROTEROZÓICO) E ROCHAS SEDIMENTARES ASSOCIADAS NO FLANCO LESTE DA SERRA DA PIMENTA, SW DE MINAS GERAIS: UM SISTEMA DE FAN DELTA.
Authors: Castro Paulo de Tarso Amorin , Dardenne Marcel Auguste 
Published: January 2016

In the southwest part of São Francisco Craton occur neoproterozoic metasedimentary rocks of the Bambuí Group. Among these rocks the Samburá Conglomerate outcrops nearby the external (eastern) region of the southernmost part of Brasilia Thrust Belt. Sedimentological studies carried on these rocks at Serra da Pimenta region reveals that they belong to a fan delta system developed at the toes of thrust fault escarpments of Brasilia Thrust Belt. Petrographic analysis of clasts of Samburá Conglomerate pointed to Canastra Group and Pium-í greenstone belt rocks of Serra da Pimenta mountains as source rocks. The fan delta deposits are rested above shallow marine carbonate rocks of the base of Bambuí Group.
Per un nuovo approccio della critica leviana. Viaggi alle radici dell’opera leviana
Authors: Vandewaetere Sara 
Published: January 2016

Recensione di: Raniero Speelman, Elisabetta Tonello & Silvia Gaiga (a cura di), Ricercare le radici. Primo Levi lettore-Lettori di Primo Levi, Utrecht, Igitur Publishing, 2014, 282 p., ISBN: 9789067010382, pubblicazione OA
Spiraled Boreholes: An Expression of 3D Directional Instability of Drilling Systems
Authors: Marck Julien , Detournay Emmanuel 
Published: January 2016

Summary
Borehole spiraling is predicted by analyzing the delay differential equations (DDEs) governing the propagation of a borehole. These evolution equations, expressed in terms of the borehole inclination and azimuth, are obtained from considerations involving a bit/rock-interaction law that relates the force and moment acting on the bit to its penetration into the rock; kinematic relationships that describe the local borehole geometry in relation to the bit penetration; and a beam model for the bottomhole assembly (BHA) that expresses the force and moment at the bit as functions of the external loads applied on the BHA and the geometrical constraints arising from the stabilizers conforming to the borehole geometry.
The analytical nature of the propagation equations makes it possible to conduct a systematic stability analysis in terms of a key dimensionless group that controls the directional stability of the drilling system. This group depends on the downhole weight on bit (WOB), on properties of the BHA, on the bit bluntness, and on parameters characterizing the steering response of the bit. The directional stability of a particular system then is assessed by comparing the magnitude of this group with a critical value, representing a bifurcation of stability, which depends only on the BHA configuration and on the bit walk. If this group is less than the critical value, the system is deemed to be directionally unstable, and borehole spiraling is likely. Stability curves for an idealized BHA with two stabilizers show that the bit walk tends to make drilling systems more prone to spiraling. Applications to field cases are discussed. Simulations conducted by integrating the equations of borehole propagation also are presented. They illustrate that, for unstable systems, the model predicts spiraled boreholes with a pitch comparable with what generally is observed in the field.
Optimization of Well Completion Method and Casing Design Parameters to Delay Casing Impairment Caused by Formation Slippage
Authors: Hu Chaoyang , Ai Chi , Tao Feiyu , Wang Fengjiao , Yan Maosen 
Published: January 2016

Abstract
There are often plenty of horizontal planes of weakness in reservoir formations, especially in shale formations, as reported for a number of oilfields. Once the weak-plane fails, the formation will become unstable, and can easily undertake slippage across a large area along its interface. The number of casing failure caused by slippage of weak-plane has been increasing significantly in recent years. Wells with casing failure are concentrated in an increasing number of areas. However, there has been lack of research efforts on how to optimize cementing and completing parameters in order to prevent casing failure induced by formation slippage. To address the problem, a more advantage completing type has been elected by qualitative analysis. The calculation model of critical slip displacement in un-cemented conditions was established. A finite model was used to test and verify the analysis and the model. The critical slip displacement of casing shear damage was also calculated. In this study, a new cementing practice was then proposed by optimizing casing parameters according to API standards, and a new research method was also put forward by proposing new casing materials to effectively mitigate casing failure caused by formation slippage for the future. Modeling results indicate casing failure induced by formation slip is different from conventional casing damage. The slip displacement needs to be used to measure casing impairment inside of maximum stress. Casing elongation is the key parameter for controlling casing shear failure. The type that keep the weak-plane un-cemented exhibits a larger critical slippage displacement .So the casing with lower grade and smaller thickness is recommended in weak-plane if the casing could meet all other down-hole requirements. The new concept is very different from the common belief that the good quality cement and higher grade and thicker casing are safer. If the elongation of casing can be improved by 60%, the critical casing failure slippage displacement can be increased by 21.40%. In this study, a new casing design and well completion method to prevent casing failure caused by formation slippage was proposed, and some guidance was provided for manufacturing casing with new material that can effectively mitigate or delay casing damage.
Coiled Tubing Conveyed Expandable HP Patch - A Cost Effective Solution to Wellbore Integrity Problems
Authors: Teasdale Paul , Keddie Richard , Fritsch Jerry 
Published: January 2016

Abstract
With the current low oil prices, Operators are under increasing financial pressure to look at new ways to safely maximize the value of their assets whilst operating within the constraints of the regulatory guidelines. Many operators have placed a greater emphasis on restoring existing wellbore integrity to develop their assets more efficiently instead of performing an expensive side-track or drilling costly new replacement wells.
This paper will review the challenges faced by a major American Operator while drilling an unconventional well in the Marcellus Shale Basin where casing integrity issues arose.
Solid expandable tubular technology has provided operators with a cost effective solution to remediate wellbores for a number of years. Since 2009 the High Performance (HP) solid expandable patch has been installed in over 170 wells, addressing completion / production issues, however, these systems had always been run on jointed pipe.
The recent (2015) deployment of an HP expandable patch on coiled tubing for the operator provided a technical and more economically attractive solution over alternative options. The planning, procedures and execution of this first ground breaking installation will be discussed in this paper.
The operator required a solution to seal off squeeze perforations which would have to withstand high pressure fracturing operations. The area regulatory agency had suspended their operations, not allowing completion of the well due to a poor cement bond behind the production casing. This required remediation using a perforation and squeeze operation. The cement squeeze alone would not hold up to the high pressures required to fracture the well. An HP patch provided the optimum solution that would meet the requirements to complete the well. Side-tracking or drilling a costly replacement well, did not provide an economic option.
A coiled tubing unit was used to perform the required cement squeeze. Since the HP patch could be run on coiled-tubing, it eliminated the need to mobilize additional equipment saving the operator time and money. After squeezing cement, the 4-1/4in HP patch was successfully installed into the 5-1/2in casing covering the squeeze perforations and then tested to 9,900 psi, - more than enough to withstand the planned fracturing pressures.
Careful planning and operational support gave the client the confidence to install the expandable HP patch on coiled tubing to fully restore their well integrity. Over the last few years the HP patch has been developed to be deployed by various methods, thus providing significant opportunity for operators to revitalize their wellbore with a more effective and economical outcome.
Delivering Selective Interval Control: Electro-Hydraulic Intelligent Completion Enhances Reservoir Management for Multilateral Well
Authors: Garcia Elias , Mathew Manesh 
Published: January 2016

Abstract
Multilateral wells can be challenging to produce in heterogeneous reservoirs, and water coning in laterals can potentially kill wells without lateral control. An operator in the Middle East wanted to increase, and subsequently control, the number of laterals for its wells. This paper describes the trial test of a new multizone, downhole, electro-hydraulic intelligent completion system. The candidate well required six laterals to be isolated, monitored, and controlled from the main bore.
After the system has been installed successfully, the electro-hydraulic downhole control module actuation process first begins by supplying pressure to the desired hydraulic line. The pressure remains behind a pressure-blocking barrier within the module and is only released by enabling the electronics inside the desired module. This, in turn, releases the pressure to the interval control valve (ICV) open and close ports at the desired zone. One of the unique features of this system is that it uses simple, passive electrical components to selectively address each ICV. The reduced number of electronic components increases reliability by minimizing potential failure points.
Because the system is also used in conjunction with other intelligent completion technologies, such as ICVs, the crew and rig personnel found the first installation, including making connections during run in hole (RIH) operations, to be very similar to other applications. In addition, the system architecture is simple and reliable, which reduces the learning curve for field personnel and ultimately ensures that the operator will begin to benefit from the system's functionality as soon as possible. Actuation times for valve steps ranged from 20 to 25 seconds, emphasizing enhanced system response, as compared to conventional intelligent completions.
The deployment of the electro-hydraulic downhole control module greatly enhanced the ICV performance by enabling the system to remain pressurized when the operation of any of the ICVs was required, enabling the operator to remotely control six ICVs at depths of up to approximately 7,500 ft with two hydraulic lines and one electric line. Ultimately, production control by means of this electro-hydraulic downhole control module combined with ICVs will enable the operator to quickly respond to drawdown and water ingress, thereby maximizing productivity and improving well performance.
This paper presents novel information based on the pairing of an electro-hydraulic downhole control module with ICVs. Comparable control systems are typically paired with inflow control devices (ICDs) or valves that have flow rates similar to ICDs. In contrast, this electro-hydraulic downhole control system is capable of providing a maximum flowing differential of 5,000 psi in production mode as a result of the use of reliable interval control valves.
Plasma-Based Milling Tool for Light Well Intervention
Authors: Gajdos Matus , Mostenicky Ivan , Kocis Igor , Kristofic Tomas , Plichta Michal , el Bannan Gamal , Taha Islam 
Published: January 2016

Abstract
The paper is focused on emerging plasma-based milling technology enabling wider use of Light Intervention while restoring Well Integrity. The tool should be able to RIH through tubing minimizing footprint of the equipment using coiled tubing system. The presented milling technology uses electrical plasma for material disintegration. A significant advantage is based on the size of disintegrated material when compared to conventional milling producing massive swarf / debris. Analysis of cuttings produced during casing / tubing milling with plasma-based tool shows that their size distribution is based on the major fraction in the range of 1-5 mm. This feature reduces possibilities of intervention failures related to swarf / debris in the well in order to maintain Well Integrity.
The technology is currently under development with expected field testing in 2016. Currently, the technology´s application is focused on Plug & Abandonment (P&A) service while being developed within Joint Industry Project (JIP) with O&G operators and oilfield service provider. Parallel to JIP, the team is capable to customize the technology and the tool itself for applications like slot recovery, side-tracking and pipe recovery. The unique features of the plasma-based technology can be beneficial for several Well Intervention applications in the Middle East region.
Innovative Rolling Cutter Technology Significantly Improved Footage and ROP in Lateral and Vertical Gas Applications in Saudi Arabia
Authors: Platt James , Valliyappan Somasundaram , Karuppiah Venkatesh 
Published: January 2016

Abstract
Saudi Aramco is developing gas fields in various areas utilizing vertical and horizontal wells with rotary as well as motor BHAs. This application requires Saudi Aramco to drill laterals through an extremely tight sandstone formation with inclination varying anywhere from 72° to 90°. The highly abrasive formation is causing inconsistent PDC bit performance while drilling the 5 7/8-in. horizontal section resulting in exceeding the authorization for expenditure (AFE) of the wells. Saudi Aramco, in collaboration with the bit company, analyzed the field data, which showed extensive cutter damage, with abrasive wear being the most common dull characteristic. The cutter wear was causing short runs and frequent trips to change out the bit. A step change in bit design was required to extend bit life and increase rate of penetration (ROP) in areas where poor drilling performance is expected.
The fixed PDC design creates an inherent limitation because only a small portion of the cutter contacts the formation, and drilling efficiency declines as the cutter wears. The resulting wear flat generates a high degree of frictional heat, which can break the diamond-to-diamond bonds in the cutter diamond table and lead to accelerated cutter degradation. An R&D initiative was launched to investigate different methods to enable a PDC shearing element to fully rotate while drilling to increase overall cutting efficiency and bit life. Several different retention methods were investigated, and a specialized fixed housing that is brazed into the bit blade was developed. The rolling cutter assembly has essentially the same outside diameter (OD) as a standard PDC cutter, which helps maintain design flexibility and cutter placement options.
The newly designed 5 7/8-in. PDC was manufactured with strategically positioned rolling cutters and was run in a gas well. The objective was to achieve an average ROP of 4.7 ft/hr and drill a minimum of 240 ft of lateral hole section to achieve proposed 5% reduction in cost-per-foot. The bit achieved a record ROP of 14.85 ft/hr while drilling 527 ft of the abrasive sandstone formation.
After achieving positive results from tests in lateral sections, the new bit design was also tested in a two vertical sections through the same tight sandstone formation on rotary assemblies. In these applications, the new bit design performed better than those in offset wells, with one of the two drilling from shoe to shoe for the first time in that field.
This paper will discuss the application and evolution of rolling cutter bits, along with the results achieved by bits fitted with these cutters in Saudi Arabia.