bluuebunny/crossref_metadata_2025_split huggingface dataset:
UM OLHAR SOBRE AS PRÁTICAS AVALIATIVAS DOS PROFESSORES QUE ENSINAM MATEMÁTICA
Authors: Jucá Rosineide Sousa 
Published: November 2019

O objetivo deste trabalho é investigar as concepções e práticas avaliativas dos professores que ensinam matemática na Educação Básica e Ensino Superior. A metodologia de pesquisa adotada foi do tipo qualitativa, na qual elaboramos e aplicamos um questionário para 112 professores que ensinam matemática na Educação básica e no nível superior da Cidade de Belém do Pará. A revisão de literatura sobre o tema propiciou trazer uma ampla discussão sobre o processo de avaliação da aprendizagem, em especial em matemática. As análises dos dados nos apontaram que os professores têm uma prática voltada para a concepção de exame e que embora digam utilizar a avaliação na perspectiva formativa, não a identificamos na sua prática avaliativa. Os professores também confundem critérios com instrumentos de avaliação ou formas de ensino; apesar disso, observamos que os professores possuem conhecimento de variados instrumentos de avaliação e que utilizam os mesmos.
Nuclear-Magnetic-Resonance Study on Oil Mobilization in Shale Exposed to CO2
Authors: Wang Haitao , Lun Zengmin , Lv Chengyuan , Lang Dongjiang , Luo Ming , Zhao Qingmin , Zhao Chunpeng 
Published: November 2019

SummaryReservoirs in the Qian 34 10 rhythmic layer of the Qianjiang Basin are shale oil reservoirs with intersalt sediments. During the natural depletion and development process, production rate of oil decreases rapidly. Water injection and CO2 injection are potential technologies for enhanced oil recovery (EOR) in shale. Because of high salt content in formations, unsaturated water dissolves salt and damages reservoirs. CO2 does not react with salt, and CO2 injection does not damage reservoirs. Moreover, CO2 could enter the micropores of the reservoir rocks and mobilize oil by diffusion, extraction, and swelling mechanisms. To verify oil mobilization in the shale exposed to CO2, exposure experiments based on nuclear magnetic resonance (NMR) were conducted in this study.NMR T2 spectrum could reflect the oil in place and be used to calculate the oil content of rock with low permeability. In this study, 10 fresh shale samples (from six depths) were analyzed, and the oil contents were determined using NMR T2 spectra. Two of the shale samples with high oil contents were selected for the CO2-exposure experiment. At a temperature of 40°C and a pressure of 17.5 MPa, the fresh shale samples were exposed to CO2, and the NMR T2 spectra obtained were used to continuously determine the oil content of the shale. The oil mobilization in the shale exposed to CO2 was determined.The results of the NMR T2 spectra showed that the NMR volume fractions of the remaining oil in seven fresh shale samples were above 10%. The recovery of the S5# shale exposed to CO2 was 51.2% after 8 days, whereas that of the S9# shale was 55.8% after 6.1 days. These results indicated that more than half of the shale oil was mobilized during the relatively long exposure time after CO2 injection. NMR T2 spectroscopy results also showed that oil in all pores could be mobilized as the exposure time increased.This study showed the quantitative results of the CO2-injection method and EOR in a shale oil reservoir of the Qianjiang Basin. All conclusions support starting a CO2-EOR pilot project in the shale oil reservoir with intersalt sediments with ultralow permeability.
Silica and Graphene Oxide Nanoparticle Formulation To Improve Thermal Stability and Inhibition Capabilities of Water-Based Drilling Fluid Applied to Woodford Shale
Authors: Aramendiz Jose , Imqam Abdulmohsin 
Published: November 2019

SummaryDrilling-fluid design for shale plays aims to deal with the lack of wellbore stability associated with fluid-invasion, shale-swelling, and cuttings-dispersion phenomena. Although oil-based mud can be used to achieve these goals, environmental and economic concerns limit its application. This research evaluates the potential of using silica (SiO2) nanoparticles (NPs) (SiO2-NPs) and graphene nanoplatelets (GNPs) as drilling-fluid additives in a single formulation to improve shale inhibition and long-term stability of water-based mud (WBM) against temperature effects. The design of the nanoparticle WBM (NP-WBM) followed a customized approach that selects the additives according to the characteristics of the reservoir. Characterization of Woodford shale was completed with X-ray diffraction (XRD), cation-exchange capacity (CEC), and scanning electron microscopy (SEM). The aqueous-stability test and ζ-potential measurements were used to assess the stability of the NPs. NP-WBM characterization included the analysis of the rheological properties measured with a rotational viscometer and the evaluation of the filtration trends at low-pressure/low-temperature (LP/LT) and high-pressure/high-temperature (HP/HT) conditions. In addition, dynamic aging was performed at temperatures up to 250°F for thermal-stability evaluation. Finally, chemical-interaction tests, such as cutting dispersion and bulk swelling, helped to analyze the effect of introducing NPs on the inhibition capabilities of the WBM. Conventional potassium chloride (KCl)/partially hydrolyzed polyacrylamide (PHPA) fluid was used for comparison purposes. The results of this investigation revealed that SiO2-NPs and GNPs acted synergistically with other additives to improve the filtration characteristics of the WBM, with only minor effects on the rheological properties. NPs exhibited high colloidal stability with ζ-potential values less than –30 mV, which warrants their dispersion within the WBM at an optimal concentration of 0.75 wt%. The high thermal conductivity of NPs played a key role in promoting a nearly flat trend in the cumulative filtrate for the NP-WBM at aged conditions, whereas KCl/PHPA suffered a dramatic increase. Also, NP-WBM preserved 43.97% of its initial cuttings-carrying capacity, whereas KCl/PHPA experienced a severe reduction of 95.24% at extreme conditions (250°F). Despite the high illite content of the Woodford shale, the NP-WBM exhibited superior inhibition properties that reduced cuttings erosion and swelling effect by 24.48 and 35.24%, respectively, compared with the KCl/PHPA fluid. Overall, this investigation supports the potential use of nanomaterials to enhance the inhibition capabilities and the long-term stability of WBM for unconventional shales, presenting an environmentally friendly alternative for harsher environments.
Dynamic Diverter Technology Efficiency in Acid Fracturing Applications
Authors: Sahu Qasim A. , Arias Rommel E. , Alali Eyad A. 
Published: November 2019

Abstract
Acid fracturing has been an integral part of reservoir development strategies for carbonate reservoirs as mechanical and chemical means of bypassing formation damage enhances productivity. Over the past few years, acid fracturing has significantly increased targeting more carbonate reservoirs. There is a need to fully address the heterogeneous petrophysical and geomechanical properties of target reservoirs, which adversely affects the stimulation efficiency and production if fluids are not properly designed. When injecting stimulation fluids to fracture the reservoir rock, the fluid is prone to traveling along the path of least resistance, and consequently less permeable zones and high stress reservoir rock receive treatments that could be further improved or enhanced. Accordingly, this drives the industry to continuously develop high performance chemical dynamic diverter systems. To ensure an effective and sufficient acid fracturing is achieved when treating long intervals of perforated clusters or openhole horizontal wells.
Recent advancements in diversion technology utilize various forms of degradable particles, where they serve to provide a temporary bridge, which is either inside the existing fracture or the perforation entrance. This allows for intentionally forming a low permeability pack, allowing the pressure inside the fracture to increase and redirect the next stage of fluid to the zone having a higher degree of stress that has not yet been covered by the fracture. The objective is to increase the fracture complexity, particularly in vertical wells where there is big variation in geomechanical properties of the formation.
To gain a deeper understanding of the performance of these diverters, a simulation study was conducted to analyze and compare the efficiency of particulate diverters used in two pilot wells. Fracture modelling and sensitivity analysis were also performed to understand the effect of diverters on the fracture geometry. To match the actual treatments, modelling validation and control were achieved through utilization of field data such as production logging, temperature surveys and pressure buildup tests.
The study determined that the success of the particulate diverter employed for the fracturing application is heavily dependent and governed by the geomechanical properties of the treated zone and the ability of the diverter to overcome the stress difference in the stimulated interval. Optimization of the diverter design and degradation profile is still needed to improve and achieve the best stimulation efficiency.
Absolute Adsorption of CH4 on Shale with the Simplified Local-Density Theory
Authors: Liu Yueliang , Hou Jian , Wang Chen 
Published: November 2019

Summary
Using a thermogravimetric (TGA) method, the excess methane (CH4) adsorption of four organic shale samples is measured at temperatures of 303.15 to 383.15 K and pressures of 0 to 15.0 MPa. Simplified-local-density (SLD) theory is used to calculate the density distribution of CH4 in nanopores, which is then used to obtain the adsorbed CH4 density on four shale samples. Such density is applied to obtain the absolute CH4 adsorption by correcting the measured excess CH4 adsorption. SLD theory shows that the adsorbed CH4 density is strongly affected by temperature and pressure, as well as the pore size, which is in line with the previous findings from molecular simulations. SLD theory captures the density of the adsorbed phase of CH4 in the presence of CH4/pore-wall interactions. However, the SLD theory is more efficient than molecular simulation methods in determining the adsorbed CH4 density considering that only two parameters in the SLD model are adjusted to match the excess adsorption of CH4 on shale. It is observed that the corresponding absolute adsorption of CH4 is higher than the excess adsorption; this suggests that it is not reasonable to use the measured excess adsorption to estimate the storage of CH4 on shale. This study applies the SLD theory to investigate the adsorption behavior of CH4 in organic pores at different pressure/temperature conditions, and, more importantly, it yields a more-efficient approach (i.e., SLD theory) in determining the absolute adsorption than the sophisticated molecular simulations tools.
Effect of a tailored leaflet to promote diabetic retinopathy screening among young adults with type 2 diabetes: a randomised controlled trial
Authors: Lake Amelia Jane , Browne Jessica L , Rees Gwyneth , Speight Jane 
Published: November 2019

Abstract
Background young adults with type 2 diabetes (aged 18-39 years) are at risk of early onset and rapid progression of diabetic retinopathy, the leading cause of blindness and vision loss in working age adults. Early detection via retinal screening can prevent most vision loss, yet uptake for this priority population is consistently lower than the general diabetes population. We aimed to test the effect of a tailored, evidence-based brief health behaviour change intervention (leaflet) on self-reported uptake, and previously identified social cognitive determinants of retinal screening.Methods a pragmatic, two-arm randomised controlled trial was conducted from September 2014 to April 2015. Participants were stratified by prior screening uptake (Yes/No) and randomly allocated to intervention (leaflet) or ‘usual care’ control (no leaflet). Primary outcome was self-reported screening uptake four weeks post-intervention for ‘No’ participants who had not previously screened for diabetic retinopathy. Secondary outcome variables were changes in knowledge, attitudes, normative beliefs, intention and behavioural skills for all participants, irrespective of prior screening behaviour. To assess intervention effects on secondary outcome variables, we conducted independent samples t-tests (two-tailed) on pre-post change scores.Results 129 young adults (26% no prior retinal screen) completed baseline; 101 completed post-intervention. Power to determine effect on the primary outcome was curtailed by low recruitment of individuals with no prior retinal screen and loss to follow-up. Country of birth, language spoken at home, and relationship status were significantly associated with study attrition. Significant intervention effect was observed for one secondary outcome variable: knowledge of diabetic retinopathy ( p =.03) with moderate effect (partial eta squared η 2 =.05); no adverse effects were reported. Control group participants received the leaflet at study completion.Conclusions this study confirms that a well-designed eye health and retinal screening promotion leaflet can increase knowledge of diabetic retinopathy, an important screening predictor. The study highlights the challenges of conducting ‘real-world’ health behaviour change research with this priority population, providing insights for clinicians and researchers. Strategies to recruit, engage and retain hard-to-reach populations are discussed including nonconventional alternatives to randomised controlled trial designs. Trial registration: ACTRN12614001110673, UTN No.: U1111-1161-9803. Registered 20 October 2014 - retrospectively registered https://www.anzctr.org.au/Trial/Registration/TrialReview.aspx?id=367127.
Population status of Adansonia digitata L. and associated species in a different land use type of Quara district, northwest Ethiopia
Authors: Erku Melkamu Abere , Alemu Asmamaw , Eshete Abeje 
Published: November 2019

Abstract
Background Adansonia digitata is one of the most important Non-timber forest products and a key species that have ecological and socio-economic significance in the lowland area of Ethiopia. However, the population of the species is decreasing from time to time due to different natural and anthropogenic factors. The study important to generate information on the current existing population status of Adansonia digitata across three land use types and will provide a scientific recommendation on further management of a species.Methodology About six plots in each forest and agricultural land use type and five plots in homestead were selected randomly from the topography map. Populations of a species were determined using analysis of variance.Results The result showed that homestead and agricultural land use type had higher Adansonia digitata density than forest land use type but statically it was not significantly different. More Adansonia digitata populations were distributed in the middle diameter and height size classes. Conclusion: The study concludes that Adansonia digitata highly associated with Combretum-Terminalia, Ziziphus and Acacia tree species in the study area. This species is dominant and key ecological importance in the woodland vegetation however; Adansonia digitata has a very low importance value index in the study area, so it needs further management and conservation.
Proper hydration in contrast-induced nephropathy among patients with acute myocardial infarction and cardiac insufficiency
Authors: Sun Guoli , Liu Jin , Song Feier , He Yibo , Ying Ming , Chen Jiyan , Liu Yong 
Published: November 2019

Abstract
Backgrounds The recommended strategy to prevent contrast-induced nephropathy (CIN) among acute myocardial infarction (AMI) patients is adequate hydration. However, it is still controversial whether adequate hydration should be used to prevent CIN in AMI patients with Killip class>I.Methods In this prospective, observational registry study, 407 acute myocardial infarction (AMI) patients with Killip class>I undergoing percutaneous coronary intervention (PCI) were analyzed. The recommended hydration rate is haved before or after the procedure(0.5 mL/kg/h for Killip class >I). The endpoint was CIN(an absolute increase in serum creatinine of ≥ 0.5 mg/dL or a relative increase of ≥ 25% within 48-72 hours).Patients were divided into 2 groups by approximate median hydration volumn(HV)750ml. Multivariable logistic regression analysis was carried out to clarify the independent predictors of CIN and worsening heart failure(WHF).Results The total incidence of CIN was 24.6% in this study. There was a significant association between hydration volume and CIN in two hydration groups(HV >750 mL vs. HV=<750mL: 28.46% vs. 18.18%,P=0.020), the WHF(16.2% vs 5.19%, P=0.001). After adjusting for confounders, multivariate analysis showed that higher HV was significantly associated with CIN(adjusted odds ratio(OR)=1.829, 95% confidence interval (CI) (1.046, 3.197),) and WHF risk(adjusted OR= 2.585, 95% CI (1.104,6.055)), all P value<0.05.Conclusions For AMI patients with Killip class>I, relatively adequate hydration(HV>750ml)may be associated with a higher risk of CIN and WHF.
Transitional Care for Patients withCirrhosis: a Multidisciplinary Care Model for Prevention Complications Post-TIPS
Authors: Hou Weiwei , Xu Yin , Wan Qijiang , Fei Xiaoyan , Qian Gui-xiang , Liu Jiangwen , Jun Chen , Chen Wang , Wang Zhongmin , Yang Rumei 
Published: November 2019

Abstract
AIM
To evaluate the efficacy of transitional care interventions of multidisciplinary teams for patients with cirrhosis post-TIPS.
METHODS
68 patients undergone TIPS were randomly allocated to control or intervention group. Patients in control group received conventional care, patients in the intervention group received conventional care combined with transitional care. The compliance behavior, incidence of HE and shunt dysfunction, Child-Pugh scores and ammonia of two groups were compared at 1,3,6 and 12 month post-TIPS.
RESULTS
Repeated measures analysis of variance showed significant group effects from 1,3,6 and 12 month post-TIPS for compliance behavior scores of the two groups. Intervention group had significant higher compliance behavior scores than control group 1, 3 and 6 month post-TIPS respectively. The incidences of HE the intervention group were significantly lower than control group12 months after TIPS.The incidences of shunt dysfunction in the intervention group were significantly lower than control group 12 months after TIPS. The group effects ,time effects and group*time interaction showed no significant difference in Child-Pugh scores and blood ammonia between the two groups.
CONCLUSION
Post-TIPS transitional care interventions increase the accessibility of patients to scientifically informed nursing, significantly improve patients’ compliance behavior and health, decrease the incidence of HE and shunt dysfunction.
KEW WORDS Transjugular intrahepatic portosystemic shunt (TIPS); Transitional care; Compliance behaviors; Hepatic function.
Early discontinuation of empirical antibiotic treatment in neutropenic patients with acute myeloid leukaemia and high-risk myelodysplastic syndrome
Authors: Niessen Floor Annabel , Mourik Maaike S. M. van , Bruns Anke H. W. , Raijmakers Reinier A. P. , de Groot Mark C.H. , Bruggen Tjomme van der 
Published: November 2019

Abstract
Introduction: Current guidelines advocate empirical antibiotic treatment (EAT) in haematological patients with febrile neutropenia. However, the optimal duration of EAT is unknown. In 2011, we have implemented a protocol advocating more restrictive use of EAT in patients with febrile neutropenia. This study assesses the effect of this protocol on carbapenem use in high risk haematological patients and its safety.

Methods: A retrospective before-after study was performed comparing a cohort from 2007 to 2011 (period I, before restrictive EAT use) with a cohort from 2011-2014 (period II, restrictive EAT use). Neutropenic episodes related to chemotherapy or stem cell transplantation (SCT) in patients with acute myeloid leukaemia (AML) or high-risk myelodysplastic syndrome (MDS) were analysed. The primary outcome was the use of carbapenems as EAT during neutropenia, expressed as days on therapy (DOT). Also the use of other antibiotics was analysed. Safety measurements included 30-day mortality, ICU admittance within 30 days after start of EAT and blood cultures positive for microorganisms sensitive to a carbapenem.

Results: 362 neutropenic episodes with a median duration of 18 days were analysed, involving 201 patients. DOT with carbapenems decreased from a median of eight days (period I) to a median of six days (period II), a reduction of 25%. Additionally, vancomycin use decreased with 55%. No deaths were directly related to early discontinuation of EAT, also no notable difference in ICU-admission and positive blood cultures was detected.

Conclusion: Implementation of a protocol promoting restrictive use of EAT resulted in reduction of carbapemen use and appears to be safe in AML or high-risk MDS patients with febrile neutropenia during chemotherapy or SCT.
Biospecimen Donation in Biobank Construction: Aspects Affecting Donation and Publics’ Concern
Authors: Zhou Ziyu , Yu Haiyang , Zhang Yun , Qin Bo , Huang Jufang 
Published: November 2019

Abstract
Background A biobank is a storage facility which stores sample mainly for biological or medical researches. Biospecimen collection is the kind of work essential in the building of biobank. However, we found the collection works had the difficulties in the proceeding because of the low anticipation rate. Methods We here conducted a questionnaire including several questions covered several aspects in order to find out people’s attitude towards biospecimen donation. The questionnaire had 20 questions mainly focused on overall publics’ participation rates, matters that influence their participation and major publics’ concerns in biospecimen donation. Results In our survey, 1477 from 2200 distributed questionnaires were responded, and electronic questionnaires showed the highest response rate of 49.9%. In all respondents, 936 showed willingness in participation, providing a percentage of 63.4%. We found that most respondents lack the knowledge of biospecimen donation and biobanking but still have a positive attitude towards biospecimen donation. Several factors, including family disease history( p <0.05), previous donation history ( p <0.01), the knowledge of biospecimen donation ( p <0.01), the knowledge of biospecimen donation conception ( p <0.01) were closely linked to donation willingness. Among those factors, family disease history, brief knowledge about biospecimen donation were independent factors affecting donation willingness. The reverse health effects and privacy leakage were major concerns among the majority of respondents. Primary reasons affected willingness, or unwillingness donation were their benefic to public interests and privacy concerns. In summary, this survey we mainly discussed factors affecting publics’ willingness and issues people concerned most in biospecimen donation of a biobank. Conclusions Most respondents hold positive attitudes towards biospecimen donation but lack relevant knowledges. Several factors influenced donation willingness probably caused by those deficiency knowledge. Even though faced this challenge, responders’ merits of altruistic behavior may contribute to the act of donation. In addition, information leakage and health impairment remained the domain factors prevented their participation. Further works are required to eliminate those undesirable elements restrained biospecimen donation by the well biobank knowledge popularization and detailed pre-donation information exchange .