bluuebunny/crossref_metadata_2025 huggingface dataset:
Factors Affecting Huff-n-Puff Efficiency in Hydraulically-Fractured Tight Reservoirs
Authors: Kanfar M. S. , Clarkson C. R.
Published: February 2017

Evaluation of enhanced liquid recovery from tight or shale reservoirs is currently of great interest to operators. One reason is the low primary oil recovery of tight/shale reservoirs, which ranges between 5-10% (Shoaib and Hoffman, 2009) even after expensive multi-stage hydraulic fracture stimulation. Enhanced recovery using the "huff-n-puff" process could be an effective solution to increase recovery without drilling new wells.

There are a number of published lab and simulation studies that investigate the efficiency of huff-n-puff in tight/shale reservoirs. These studies, however, have yielded contradictory results. For example, Chen et al. (2014) concluded that huff-n-puff has a negative impact on recovery while Yu et al. (2014) concluded that it improves recovery by 2-9%. These conflicting results underscore the need for further research. The current study, therefore, endeavors to investigate possible causes of these discrepancies.

Compositional numerical simulation is used to investigate key simulation model setup and reservoir controls on huff-n-puff efficiency in tight reservoirs. Some of these controls have never been investigated for tight reservoirs, such as the influence of grid refinement, in-situ fluid composition, and fracture pore volume/hydraulic fracture representation.

One important finding of this work is that grid refinement, and fracture pseudo width, greatly impact huff-n-puff results. The combination of coarse gridding and improper fracture representation through the pseudo width approach can lead to falsely optimistic incremental recovery associated with huff-n-puff relative to primary recovery.

While the findings presented herein are useful in explaining possible causes of the discrepancies in results reported in previous work, they can also be used to improve huff-n-puff design. For example, the combination of fine fracture spacing in multi-fractured horizontal wells and increased fracture complexity can positively influence incremental recovery obtained from huff-n-puff. Further, the results suggest that huff-n-puff timing (with respect to primary production operations) should be carefully considered.

This study will help simulation engineers improve their evaluations of huff-n-puff in tight/shales reservoirs. Additionally, it will help operators decide which reservoir is suitable for huff-n-puff operations to improve liquids recovery. Application of the findings of this study to actual field scenarios will be presented as a separate work.
Practical Completion Design Optimization in the Powder River Basin - An Operator Case Study
Authors: Ingle T. , Ketter C. , Anderson D. M. , Thompson J. M.
Published: February 2017

This case study reviews the full development cycle of Devon Energy's Parkman asset in the Powder River Basin, from exploitation to infill drilling. The focus is on successive adjustments to drilling and completion design, with the objective of net-present-value (NPV) optimization. This effort is supported primarily through timely collection and interpretation of data, which has awarded Devon with exceptional returns on investment with reasonably low risk and capital expenditure, even in a low oil price environment. Devon's success in the Parkman is largely due to the practical and adaptive nature of the underlying engineering workflows supporting key decisions as well as management's strong support for the value of information.

The methodology is based on an integrated workflow, combining core, open-hole logs, reservoir surveillance (radioactive tracers and fiber optics) along with production and flowing pressure data. Rate Transient Analysis, fracture modeling and reservoir simulation are central components of the integrated model. At every stage in the development cycle, the model is calibrated to the latest data, at which point sensitivities can be run to evaluate alternative scenarios for optimizations required for the next stage. Through successive drilling and completion improvements, Devon has successfully increased the NPV of their Parkman asset. The steps toward optimization include increasing lateral length from 4,000' to 9,500'; adjusting cluster spacing between 60' and 100' and transitioning their completion method from plug-andperf to pinpoint. Understanding the impact of oil price is critical for achieving these optimizations. The improvements were supported by reservoir simulation and ultimately confirmed with field data, which is included in this work.

This work brings to the forefront lessons that could add significant value to the business of any unconventional operator: A practical methodology for quickly converting collected data into actionable knowledge; allowing continual adjustments to be made to an unconventional completion design that maximize its performance and economic benefitIntegration of engineering and geoscience disciplines to better understand the major influences on well performance in an unconventional playOptimizing completion design to maximize the profitability of a field development plan. In the case of the Parkman, pinpoint proves to be a more optimal completion technique
Application of Monte Carlo Simulation for Estimation of Vertical and Horizontal Biot's Constants Through Calibration of the Minimum Horizontal Stress in the Tight Gas Monteith Formation
Authors: Lopez Bruno , Aguilera Roberto
Published: February 2017

Tight formations are characterized by permeabilities equal to or less than 0.1 md. Due to these low permeability values, tight gas reservoirs have been economically produced through the implementation of multi-stage hydraulic fracturing. This operation requires a proper stimulation design, which depends on the knowledge of rock properties such as Biot's constants. Therefore, the purpose of this study is to determine vertical and horizontal Biot's constants through calibration of minimum horizontal stress (MHS) with the use of well logs and mini-frac data in the tight gas Monteith formation of the Western Canada Sedimentary Basin (W CSB).

The procedure utilized in this work consists of the determination of actual MHS values from mini-frac tests. It is assumed that MHS is equal to fracture closure pressure (FCP). Two non-linear regression equations are used to estimate MHS. Statistical analysis is performed to test the appropriateness of the non-linear regression expressions for MHS modeling. Next, MHS values are calculated from well log data using an existing correlation and by the application of Monte Carlo simulation. Uniform, triangular and beta-PERT distributions are considered in this study. Then, MHS values obtained from the above two methods are matched for calibration purposes. Finally, both vertical and horizontal Biot's constants are determined from the match previously obtained.

Statistical analysis of the two non-linear regression expressions for MHS modeling reveals that FCP ranges from 10.72 MPa to 17.78 MPa in the study area. From Monte Carlo simulations, it is found that horizontal Biot's constant values are most consistent among the different distributions considered in this study as compared with the case of the vertical Biot's constant. This large variation in vertical Biot's constants is a result of the uncertainty associated with the definition of the most suitable distribution for this variable. Horizontal Biot's constant values vary from 0.81 to 0.97 whereas vertical Biot's constant ranges from 0.66 to 0.95. It is concluded that beta-PERT distribution better represents Biot's constants, however, this finding has to be corroborated against experimental data.

The methodology presented in this work is robust and represents a practical method to determine Biot's constants instead of following the assumptions considered by current commercial 3D hydraulic fracture simulators. This is the first time that non-linear regression techniques, statistical analysis, and Monte Carlo simulation are coupled all together with both well log and mini-frac data to estimate Biot's constants. This methodology can be easily applied in other tight formations.
Proppant Optimization for Foam Fracturing in Shale and Tight Reservoirs
Authors: Gu Ming , Fan Ming , Chen Cheng
Published: February 2017

Slickwater frac is widely used for stimulating the productivity of unconventional shale and tight reservoirs nowadays. Slickwater produces long skinny fractures, but only the near wellbore region is propped due to fast settling of sand. Adding gel can slow down sand settling, but gel damages the fracture surface and proppant pack. Other issues include large water consumption, water damage, and high water disposal cost. Recently, a non-damaging, less water-intensive fracturing fluid system with improved sand placement efficiency, known as polymer-free foam (PFF), is developed by Gu (2013). The current objective is to study the impacts of sand pumping designs on PFF fracturing efficiency by conducting numerical modeling. In the first step, discrete element method (DEM) and lattice Boltzmann method (LBM) are employed to simulate proppant particle compression, rearrangement, and conductivity for different mesh sizes and areal concentrations under different fracture closure stresses. Next, the conductivity results are input in an in-house fracture propagation model to simulate the fracture conductivity distribution after foam fracturing. After that, the fracture conductivity distribution is input in a reservoir production model to predict the productivity. A parametric study is conducted to understand the impacts of sand mesh size and pumping load on foam frac. With the study, the optimal sand size and concentration are determined for the new fracturing fluid system in shale and tight reservoirs. Our results show, for 140 nD shale gas reservoirs, pumping mesh 100 sand at a volume ratio of 0.15 v/v, 0.125 v/v, and 0.1 v/v are optimal sand pumping designs for PFF treatments with foam quality of 60, 70, and 80%, respectively. If the reservoir permeability is ten times larger, the optimal sand pumping designs for 60, 70, and 80% quality PFF treatments are mesh 30/50 at 0.15 v/v, mesh 100 at 0.125 v/v, and mesh 100 at 0.125 v/v, respectively. With the optimization of sand pumping design, well production can be increased by 110% for low permeability shale, or by 70-100% for high permeability tight or naturally-fractured shale formations. This paper develops a time-efficient workflow to optimize sand pumping strategy for the new PFF fracturing system. The methodology includes coupled DEM/LBM modeling of proppant conductivity, fracture modeling, and reservoir production simulation. The PFF fracturing system with optimized sand mesh size and load can provide enhanced productivity with less water consumption, less gel and water damage, and lower water disposal cost.
Measured Crude Oil MMPs with Pure and Mixed CO2, Methane, and Ethane, and Their Relevance to Enhanced Oil Recovery from Middle Bakken and Bakken Shales
Authors: Hawthorne Steven B. , Miller David J. , Grabanski Carol B. , Sorensen Jim A. , Pekot Lawremce J. , Kurz Bethany A. , Gorecki Charles D. , Steadman Edward N. , Harju John A. , Melzer Stephen
Published: February 2017

Enhanced oil recovery (EOR) processes using CO2 in tight unconventional plays like the Bakken Formation are expected to be very different from the processes which control EOR in conventional reservoirs. During CO2 EOR in conventional reservoirs, CO2 flows through the permeable rock, and the minimum miscibility pressure (MMP) is an important operational parameter for achieving a successful "miscible" flood. In contrast, in tight fractured systems like the Bakken, CO2 flow may be dominated by fracture flow, and not by CO2 flowing through the rock matrix as in a conventional reservoir flood. Since fracture-dominated CO2 flow could essentially eliminate the "flushing" mechanisms responsible for increased recovery in conventional reservoirs, operation at or slightly above MMP may or may not be relevant for the success of an EOR flood in such tight fractured reservoirs. To investigate this concept, capillary-rise vanishing interfacial tension (VIT) was used to measure MMP values for a typical Bakken crude oil (API gravity 41.5) with CO2, methane, and ethane at 110°C (230°F) typical for the reservoir. The effect of these different fluids, as well as the effect of pressures at, above, and well above MMP on recovering crude oil hydrocarbons was determined for small rock core samples from the productive Middle Bakken laminated zone as well as from Upper and Lower Bakken samples.

Compared to the MMP value for CO2 of 2520 psi, MMP with methane nearly doubled at 4510 psi, but was nearly cut in 1/2 for ethane at 1360 psi. The recovery of crude oil hydrocarbons from both the Middle Bakken and Lower Bakken shale samples with 24-hour exposures to these fluids at reservoir pressures showed efficiencies that parallel the MMPs determined with each fluid; i.e., ethane yielded faster and more efficient recovery of the crude oil than CO2, but both CO2 and ethane were much more efficient than methane at recovering the crude oil from the 11-mm round rod rock samples. Although hydrocarbon recoveries from the rock samples paralleled each injectant's respective MMP values, extractions with CO2 at the MMP, and at ca. double and triple the MMP pressure showed much more efficient crude oil recoveries at higher pressures from both the Middle Bakken and Lower Bakken shale, demonstrating that EOR pressures much higher than the MMP could substantially increase oil recoveries in tight unconventional systems like the Bakken.
Estimating Oil Saturation Index OSI from NMR Logging and Comparison with Rock-Eval Pyrolysis Measurements in a Shale Oil Reservoir
Authors: Piedrahita Jaime , Aguilera Roberto
Published: February 2017

Identification of potential oil flow zones in shale reservoirs has been conducted in the past with the use of an oil saturation index (OSI) determined from Rock-Eval pyrolysis measurements on samples collected at pre-specified depths (partial sampling). This study introduces a new equation that allow continuous OSI determination with the use of the Nuclear Magnetic Resonance (NMR) log.

Geochemical analysis using measurements from Rock-Eval pyrolysis and LECO Carbon Analyzer laboratory techniques were carried out in a shale oil reservoir for estimating parameters such as total organic carbon (TOC) and OSI. This allowed identification of hydrocarbons zones. Next, Cross-over and OSI cut-off techniques were applied to distinguish intervals with producible and non-producible hydrocarbons. Subsequently, NMR total response relaxation time, T2, was divided into eight T2 cut-offs to calculate bin porosities. A sensitivity analysis for T2 cut-offs was run in order to establish a good match between the bin porosity and OSI values that indicate producible hydrocarbons.

A good agreement was reached among OSI greater than 100 mg HC/gTOC and the bin porosities estimated between T2 = 33ms and 80 ms. This match was corroborated by the visual "oil cross-over" from geochemical analysis. An OSI cut-off equal to 100 mg HC/g TOC has been recommended in the past by several authors to differentiate producible from non-producible oil intervals. That cutoff compares well with the NMR bin porosity developed in this paper. Thus, the porosity estimation between above T2 cut-offs is a good indicator of producible hydrocarbons in a shale oil reservoir. This observation has led to the development of a new equation in this paper to convert the NMR bin porosity to OSI (or vice versa) continuously throughout the NMR logged interval.

Also, if TOC is already known from a given method (for example, Passey, Smocker, GR spectral, Uranium), the S1 parameter can be estimated from only well logs resulting in continuous S1 and OSI curves. This is a very significant advantage since Rock-Eval pyrolysis and LECO analyzer are run on samples which are taken at predefined depths (partial sampling); therefore, possible producible oil zones could be bypassed if only core results are taking into account.
Multivariate Analysis Using Advanced Probabilistic Techniques for Completion Design Optimization
Authors: Groulx Bertrand , Gouveia Jim , Chenery Don
Published: February 2017

Efforts to identify optimal completion technology and design parameters are complicated by the compounding impacts of broad statistical variability in operations, reservoir/fluid and completion/wellbore design. There are several analysis approaches available to identify and optimize key completion design parameters. Each approach offers limited insight on its own, but combining a set of approaches into a disciplined methodology can collectively present a unique understanding of optimal completion technology and design. Traditional parallel coordinates visualizations offer strong visual cues of correlations, but in datasets with broad statistical variability they often convey a lack of correlation and fail to distinguish statistical trends. Statistical methods are unique in their ability to provide insights into non-continuous correlations where upper and lower thresholds exist; however, they are not effective at providing a deterministic measure of an individual input's effect on an outcome. Modelling and regression analysis can provide a means to measure the effect of several input variables on an outcome, but lack transparency and are often perceived as a "black box" solution with outcomes that have limited supporting evidence, or supporting evidence that is difficult to understand.

We demonstrate a robust multivariate analysis methodology using a hybrid approach involving the principles of parallel coordinates, dimensional normalization and advanced probabilistic techniques. One of the benefits of this approach is that it can yield statistically significant insights on sample sets as small as 80 wells. The methodology involves six steps that offer transparency to the analysis and facilitate a narrative of understanding: Selection of a performance measure setAnalogue well selectionSelection of numerical completion design input parametersParallel Coordinates Distributions: input parameter impact analysisEvaluation of analogue fitness and subset selectionInput Optimization Distributions: input optimization process

We found that the use of consistent dimensional normalization on both inputs and outcomes better isolates the impact of an input parameter. The shape and position of parallel coordinates distributions can illustrate nuances of impact that are lost in other multivariate approaches.

In this paper we apply and test this methodology on three major resource plays in the Western Canadian Sedimentary Basin: a gas play, a liquids-rich gas play and an oil play.
Fracture Network Characterization by Analyzing Flowback Salts: Scale-Up of Experimental Data
Authors: Zolfaghari Ashkan , Tang Yingzhe , He Jia , Dehghanpour Hassan , Bearinger Doug , Virues Claudio
Published: February 2017

As observed in many shale-gas plays, the produced flowback water is highly saline and the salt concentration increases with time. Several past studies investigated water-rock interactions to interpret flowback chemical data, evaluate reservoir performance, and investigate the environmental impacts of fracturing operations. In this study, we measure the total ion produced (TIP) during flowback process for two wells completed in the Horn River Basin. We also conduct two sets of imbibition experiments to investigate the effects of water-rock surface area (As) and rock volume (Vs) on the TIP in laboratory. Furthermore, we compare the experimental correlations between As - TIP and Vs - TIP with the TIP measured in the field flowback water to estimate fracture surface area (AFrac) and invaded reservoir volume (IRV).

In order to investigate the effect of As on the TIP, we conduct a series of imbibition experiments using shale samples of different As but similar Vs at constant temperature. The experiments are performed at T = 23, 45, and 65°C to investigate the temperature effect on the TIP. The experimental correlation between TIP and As at constant temperature is applied to estimate AFrac using field data of TIP. We further utilize AFrac - T correlation to extrapolate AFrac at reservoir temperature. In order to evaluate the estimated AFrac values we also calculate AFrac by rate-transient-analysis (RTA). In order to investigate the effect of Vs on the TIP, we conduct a series of imbibition experiments using shale samples of different Vs but similar As at constant temperature. Experimental results indicate that the TIP increases with both As and temperature. The calculated AFrac value at reservoir temperature is approximately 106m2 for both target wells. These results are in agreement with RTA calculation of AFrac values for both target wells (≈ 106m2). Our estimated values of AFrac are also in agreement with the field data of water recovery. The well with higher estimated value of AFrac has lower water recovery in the field as opposed to the well with lower estimated value of AFrac and higher water recovery in the field. Additionally, the estimated IRV is approximately 105 - 106m3 for both target wells. Our estimated values of IRV are also in agreement with the field data of water recovery and experimental results of water uptake. The well with higher estimated value of IRV has higher water uptake during imbibition experiments and also higher leak-off rate in the field. In contrast, the well with lower estimated value of IRV has lower water uptake during imbibition experiments and also lower leak-off rate in the field.
Bayesian History-Matching and Probabilistic Forecasting for Tight and Shale Wells
Authors: Hamdi Hamidreza , Sousa Mario Costa , Behmanesh Hamid
Published: February 2017

The fracturing of horizontal wells is a recently developed tool to help enable tight and shale formations to produce economically. Production data analysis of the wells in such formations is frequently performed using analytical and semi-analytical methods. However, in the presence of nonlinearities such as multi-phase flow and geomechanical effects, the numerical simulations are necessary for interpretations and history-matching techniques as they are required for model calibration.

Reservoir history-matching techniques are usually based on the frequentist approach and can provide a single solution that can maximize the Likelihood function. Production forecasts using a single calibrated model cannot honor the uncertainty in the model parameters. Therefore, a Bayesian approach is suggested where we can combine our prior knowledge about the model parameters together with the Likelihood to update our knowledge in light of the data. The Bayesian approach is enriched by applying a Markov chain Monte Carlo process to updated the prior knowledge and approximate the posterior distributions.

In this paper, a one-year production data of a real gas condensate well in a Canadian tight formation (lower Montney Formation) is considered. This is a horizontal well with eight fracture stages. A representative 2D model is constructed which is characterized by 17 parameters which include relative permeability curves, capillary pressure, geomechanical effects, fracture half-length, fracture conductivity, and permeability and water saturation in the stimulated region and the matrix. Careful analysis of available data provide acceptable prior ranges for the model parameters using non-informative uniform distributions. Markov chain Monte Carlo algorithm is implemented using a Gibbs sampler and the posterior distributions are found. The results provide an acceptable set of models that can represent the production history data. Using these distributions, a probabilistic forecast is performed and P10, P50 and P90 are estimated.

This paper highlights the limitations of the current history-matching approaches and provides a novel workflow on how to quantify the uncertainty for the shale and tight formations using numerical simulations to provide reliable probabilistic forecasts.
Certain Aspects of Autologous Hematopoietic Stem Cell Transplantation in Patients with Multiple Myeloma
Authors: Gritsaev Sergei Vasil'evich , Kuzyaeva A.A. , Bessmel'tsev S.S.
Published: February 2017

The review dwells on certain problems of mobilization and conditioning regimens, as well as autologous hematopoietic stem cell transplantation (auto-HSCT) in patients with multiple myeloma. The aim of the review is to determine new approaches to improve the effectiveness of the auto-HSCT.
DOES ICTS MATTERS FOR CORRUPTION?
Authors: Sinuraya Caroline Gratia , Rachmawati Tutik
Published: February 2017

Corruption is a common term used in both private and public sector to understand the misused of resources in order to enriched themselves, unlawfully. Corruption has been endemic in Indonesia starting from the highest peak of government to the grass root level. Some organizations had tried to eradicate corruption with any possible way they could find; law enforcement, behavioural to education approach. However, the use of information, technology and communication or ICTS or known as e-Government in eradicating corruption has been considered a break trough. They believe that by implementing ICTS in several sectors of public services, it could help to eradicate corruption in Indonesia. Local Governments has been using e-budgeting but corruption is still prevalent. ICTS serves as way to reduce corruption rate but it does not eradicate corruption at all. The adoption of ICTS in governmental systems creates an opportunity for the officers and staffs who understand and occupies skills of ICTS (e-literate) and at the same time blocks chances for those who do not understand ICTS. This is called as an up-skilling corruption. This paper will discuss e-administration which is understood as ‘the use of information and communication technologies and in particular the internet, as a tool to establish a better-quality administration. Using a case study of e-administration in Bandung City, this paper will discuss how Bandung City is to implement Online Licensing through BPPT or Badan Pengkajian dan Penerapan Teknologi (The Agency Assesment and Application of Technology) with a consideration that there is a chance for up-skilling corruption. Further, upon the discussion, recommendation on how to implement proper e-administration so that it will achieve its goal to eradicate corruption.
The elimination of open defecation and its adverse health effects: a moral imperative for governments and development professionals
Authors: Mara Duncan
Published: February 2017

In 2015 there were 965 million people in the world forced to practise open defecation (OD). The adverse health effects of OD are many: acute effects include infectious intestinal diseases, including diarrheal diseases which are exacerbated by poor water supplies, sanitation and hygiene; adverse pregnancy outcomes; and life-threatening violence against women and girls. Chronic effects include soil-transmitted helminthiases, increased anaemia, giardiasis, environmental enteropathy and small-intestine bacterial overgrowth, and stunting and long-term impaired cognition. If OD elimination by 2030 is to be accelerated, then a clear understanding is needed of what prevents and what drives the transition from OD to using a latrine. Sanitation marketing, behaviour change communication, and ‘enhanced’ community-led total sanitation (‘CLTS + ’), supplemented by ‘nudging’, are the three most likely joint strategies to enable communities, both rural and periurban, to become completely OD-free and remain so. It will be a major Sanitation Challenge to achieve the elimination of OD by 2030, but helping the poorest currently plagued by OD and its serious adverse health effects should be our principal task as we seek to achieve the sanitation target of the Sustainable Development Goals – indeed it is a moral imperative for all governments and development professionals.
What has poverty got to do with it? Analysis of household access to improved sanitation in Ghana
Authors: Mariwah Simon , Amo-Adjei Joshua , Anima Prisca
Published: February 2017

This paper investigates antecedents to demand for household sanitation in Ghana. We employed a sequential, mixed-method approach, relying on the 2011 Ghana Multiple Indicator Cluster Survey (MICS) and primary qualitative data generated from individual and group interviews. The aim was to ascertain the role of household assets (measured by household wealth) in access to improved sanitation in Ghana. The study found that although wealth positively influenced household ownership of improved sanitation, the effect is strongly noticed only at the pinnacle of wealth quintiles (the richest households). From the qualitative data, we find that, beyond poverty, a mix of cultural, social, political and economic nuances influenced and somehow perpetuate low access to improved sanitation in Ghanaian households. We therefore surmise that means targeting of the poor and application of social marketing of sanitation in both rural and urban areas can help trigger awareness and demand for improved sanitation in Ghana.
Adsorption of iron(III), cobalt(II), and nickel(II) on activated carbon derived from Xanthoceras Sorbifolia Bunge hull: mechanisms, kinetics and influencing parameters
Authors: Zhang Xiaotao , Hao Yinan , Wang Ximing , Chen Zhangjing
Published: February 2017

Xanthoceras Sorbifolia Bunge hull activated carbon (XSA) was prepared and characterized by Brunauer–Emmett–Teller analysis, scanning electron microscopy and energy dispersive X-ray (EDX) spectroscopy. The ability of XSA as an adsorbent was investigated for the removal of the iron group ions Fe(III), Co(II), and Ni(II) from aqueous solution. Optimum adsorption parameters were determined based on the initial concentrations of the iron group ions, pH, adsorption temperature, and adsorption time in adsorption studies. The maximum monolayer adsorption capacities were 241.13 mg/g for Fe(III), 126.05 mg/g for Co(II), and 187.96 mg/g for Ni(II), respectively. Adsorption kinetics and isotherms showed that the adsorption process best fitted the nonlinear pseudo-second-order and Langmuir models, and the affinity of the ions for XSA decreased as follows: Fe(III) > Ni(II) > Co(II). Regeneration studies indicated that XSA could be used after several consecutive adsorption/desorption cycles using HNO3. Fourier transform infrared and EDX spectra revealed the chemical adsorption value of XSA as an adsorbent for removing iron group ions from aqueous solutions.
O DIREITO DE PROPRIEDADE E JUSTIÇA
Authors: Weber Thadeu
Published: February 2017

O objetivo do texto é justificar o direito de propriedade como direito fundamental individual e explicitar seu conteúdo. Locke, Hegel e Rawls são referidos como fontes históricas consagradas para esse intuito. Locke, pela tese de que o trabalho fundamenta a propriedade; Hegel, pela estreita vinculação entre propriedade e liberdade; Rawls, por ter enumerado a propriedade entre os direitos fundamentais que compõem o primeiro princípio de sua concepção política de justiça. Justifica-se, com isso, ser o direito de propriedade um elemento constitucional essencial.
FEDERALISMO FISCAL NA AMÉRICA LATINA: OS CASOS DE MÉXICO, ARGENTINA E BRASIL
Authors: Bastos Thiago Guerreiro , Val Eduardo Manuel
Published: February 2017

A forma federativa de estado representa a expressão política de um Estado dentro de seu território. Em razão da inexistência de modelos federativos universais e/ou globais, cada país assenta sua forma federativa a partir de práticas políticas passadas. A autonomia financeira ou poder político tributário, por certo, é um dos principais elementos em uma federação, pois será a partir dele que a descentralização política se efetivará. Por esse motivo, decidiu-se elaborar um trabalho focado no federalismo fiscal no âmbito da América Latina, em razão das proximidades socioeconômicas. Dessa forma, foram escolhidos três países: Estados Unidos Mexicanos, República Argentina e República Federativa do Brasil. Os três países, à sua maneira, rumaram para uma centralização fiscal, tendo, por motivos inerentes a cada um dos estados citados, variações em níveis de centralização. Contudo, o resultado final tende a ser próximo, qual seja, um federalismo fiscal ineficiente e que tende a sufocar as autonomias das unidades federadas.
É POSSÍVEL FALAR EM TEORIA NORMATIVA DIALÓGICA NO BRASIL?
Authors: Da Escossia Matheus Henrique dos Santos
Published: February 2017

O presente ensaio possui o objetivo de investigar a teoria dos diálogos constitucionais e sua aplicação no cenário jurídico-político brasileiro. Para tanto, toma-se por base a catalogação feita por Christine Bateup no artigo The Dialogic Promise, em que reparte tal teoria da seguinte maneira: i) de um lado, as empíricas (ou descritivas); ii) de outro, as normativas (ou prescritivas). Nesse sentido, o foco do presente trabalho repousa sobre essa segunda dimensão, de modo a avaliar se é adequado fazer uma mediação teórica em prol de uma teoria dialógica normativa brasileira e em que medida é pertinente tal construção. Para tanto, serão abordados quatro pontos que necessariamente essa mediação deve levar a sério, quais sejam: a) assimetria estrutural das relações sociais; b) pragmática linguística e controle discursivo (ou se é factível aproximar o diálogo institucional do diálogo entre cidadãos em uma democracia deliberativa); c) a sobreposição de funções pelo Supremo Tribunal Federal (STF), que simultaneamente opera como Corte Constitucional, corte recursal e jurisdição originária; d) “Nova Separação de Poderes”. A hipótese a ser verificada é no sentido de que é inviável a construção de uma teoria dos diálogos constitucionais normativa brasileira que ultrapasse de maneira satisfatória os quatro pontos acima, sem que incorra em algum tipo de incongruência ou incompatibilidade. A justificativa desse percurso teórico se faz pertinente na exata medida em que as instituições agonizam em busca de legitimidade democrática, cuja conflituosidade política invariavelmente as colocam em xeque. A reflexão será conclusiva no sentido de aproximar os insights de uma teoria dialógica normativa à atuação das instituições, com especial ênfase na do STF, e de que modo os respectivos desenhos podem ser beneficiar desse esforço teórico.
O MINISTÉRIO PÚBLICO BRASILEIRO E O ADVOGADO GERAL DO TRIBUNAL DE JUSTIÇA DA UNIÃO EUROPÉIA: UMA BREVE COMPARAÇÃO
Authors: Sester Peter , Oliveira Andreia Cristina de
Published: February 2017

Este artigo discorre sobre os institutos do Ministério Público do Brasil e do Advogado Geral do Tribunal de Justiça da União Europeia, por meio de comparação entre os dois; considerando o contexto jurídico, histórico e politico-cultural em que cada um está inserido. Para isso, inicialmente, serão abordadas as características da instituição brasileira; em seguida as de sua contraparte europeia; para, por fim, serem traçados paralelos, no que se refere à sua origem histórica e modo de operação similar, bem como os contrastes encontrados. Buscaremos, assim, compreender como duas instituições, que se originaram a partir da mesma figura do direito francês, foram adaptadas para as necessidades do meio em se desenvolveram.
PROJETO DE SENTENÇAS ESTRANGEIRAS DA CONFERÊNCIA DA HAIA: POR UM REGIME GLOBAL DE CIRCULAÇÃO INTERNACIONAL DE SENTENÇAS EM MATÉRIA CIVIL E COMERCIAL
Authors: Araujo Nadia de , De Nardi Marcelo
Published: February 2017

A Conferência da Haia para o Direito Internacional Privado está promovendo a adoção de regras voltadas para a minimização dos entraves à circulação internacional de sentenças. O objetivo do Projeto de Sentenças iniciado nos anos noventa do século vinte é mitigar as incertezas e riscos associados ao comércio internacional por meio do estabelecimento de um sistema facilitado e seguro de circulação internacional de sentenças. O artigo tem por finalidade preservar o histórico deste momento da evolução das negociações no âmbito da Conferência, além de especificar questões de cunho técnico discutidas no projeto que possam ser de interesse geral para aqueles envolvidos no tema da jurisdição internacional.
PERANGKAT PEMBELAJARAN IPA BERBASIS INKUIRI UNTUK MENINGKATKAN CRITICAL THINKING SKILLS DAN SCIENTIFIC ATTITUDE SISWA
Authors: Uswatun Din Azwar , Rohaeti Eli
Published: February 2017

Penelitian ini bertujuan untuk: (1) mendeskripsikan kelayakan perangkat pembelajaran IPA berbasis inkuiri berdasarkan hasil penilaian dosen ahli dan guru IPA, dan (2) mengukur keefektifan perangkat pembelajaran IPA berbasis inkuiri dalam meningkatkan critical thinking skills dan scientific attitude siswa SMP. Metode yang digunakan dalam penelitian ini adalah research and development (R&D) yang mengadaptasi model penelitian pengembangan Borg & Gall. Subjek uji coba produk terdiri atas 34 siswa kelas VII SMPN 14 Yogyakarta dan 52 siswa SMPN 1 Piyungan. Pengumpulan data menggunakan metode wawancara, observasi, angket, dan tes. Data dikumpulkan melalui pedoman wawancara, lembar observasi, lembar angket, dan soal tes. Data kelayakan perangkat pembelajaran dianalisis dengan menggunakan konversi skor skala 4. Keefektifan perangkat pembelajaran dalam meningkatkan critical thinking skills dan scientific attitude siswa dianalisis dengan multivariate analysis of variance (MANOVA) dan gain score. Hasil validasi dan uji coba produk menunjukkan bahwa (1) perangkat pembelajaran IPA layak digunakan dalam pembelajaran dan (2) efektif dalam meningkatkan critical thinking skills dan scientific attitude siswa. Kata Kunci: perangkat pembelajaran IPA, inkuiri, critical thinking skills, scientific attitude   AN INQUIRY-BASED NATURAL SCIENCE TEACHING PACKAGE TO IMPROVE STUDENT’S CRITICAL THINKING SKILLS AND SCIENTIFIC ATTITUDE Abstract The objectives of this study are (1) to explain the validity of an inquiry-based natural science teaching package and (2) to measure the effectiveness of an inquiry-based natural science teaching package to improve junior high school student’s critical thinking skills and scientific attitude. The method of this study was research and development (R & D) adapted from the development model by Borg & Gall. The product testing subjects consisted of 34 students of SMPN 14 Yogyakarta and 52 students of SMPN 1 Piyungan. The data collection techniques were interviews, questionnaires, observation, and tests. The data were collected using an interview guide, validation questionnaire sheet, readability questionnaire worksheet, pretestt-posttest questions, project assessment sheet, questionnaires, and an observation sheet.  The validity of the teaching package was analyzed by converting four scales. The effectiveness of the teaching package to improve student’s critical thinking skills and scientific attitude was analyzed through the multivariate analysis of variance (MANOVA) and gain score. The result of the validation and the product testing indicated that the teaching package (1) can be used in the natural science teaching and (2) can improve students’ critical thinking skills and scientific attitude effectively. Keywords: natural science teaching package, inquiry, critical thinking skills, scientific attitude
PENGEMBANGAN BUKU PEDOMAN GURU PADA PEMBELAJARAN FISIKA SMA MENGGUNAKAN MODEL PROBLEM SOLVING LEVEL INKUIRI
Authors: Setiyawati Susi Fatikhah , Kuswanto Heru
Published: February 2017

Penelitian ini bertujuan: (1) menghasilkan buku pedoman guru untuk pembelajaran fisika SMA menggunakan model problem solving sesuai level inkuiri yang layak digunakan; (2) mendeskripsikan keberhasilan pembelajaran fisika menggunakan model problem solving (MPS) sesuai dengan level inkuiri sesuai dengan buku pedoman terhadap peningkatan aktivitas peserta didik dan kemampuan berpikir kritis peserta didik. Penelitian ini merupakan penelitian pengembangan, sesuai langkah yang dikembangkan oleh Borg & Gall. Subjek coba menggunakan delapan kelas. Pengumpulan data menggunakan angket respon peserta didik, lembar observasi keterlaksanaan proses pembelajaran, lembar observasi aktivitas belajar dan tes kemampuan berfikir kritis peserta didik. Teknik analisis data menggunakan uji multivariat (Manova). Hasil penelitian menunjukkan bahwa produk yang dikembangkan ditinjau dari aspek materi, petunjuk umum buku, RPP & LKPD, dan perangkat penilaiam pembelajaran menurut ahli materi dan ahli media berkategori baik dan terdapat perbedaan peningkatan kemampuan berfikir kritis dan aktivitas belajar peserta didik yang signifikan antara keenam level inkuiri yang diujicobakan. Kata Kunci: model problem solving, level inkuiri, kemampuan berfikir kritis, aktivitas belajar   DEVELOPING A HANDBOOK FOR TEACHER IN TEACHERS HIGH SCHOOL LEVEL PHYSICS USE THE MODEL OF PROBLEM SOLVING LEVEL OF INQUIRY Abstract This study aims to: (1) to produce a handbook for teachers high school level physics use a model of problem solving with level of inquiry fit for use; (2) to determine the successful learning of physics using a model of problem solving in accordance with the level of inquiry to increase learning activities of learners and critical thinking abilities of learners. This research is the development, which refers to measures developed by Borg & Gall. The subject try consists of eight classes. Data collection using the questionnaire responses of learners, observation sheets learning process, observation sheet activities and critical thinking ability test learners. Data were analyzed using multivariate analysis (Manova). The results showed that the product is developed in terms of material aspects, the general guide book, subject specific paedagogy, students worksheet and the evaluation of learning by material experts and media experts categorized good and differences in the increase in critical thinking skills and learning activities of learners between the significant and simultaneous kenam inquiry levels tested. Keywords: model of problem solving, level of inquiry, activity of learners, critical thinking abilities
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Authors: - -
Published: February 2017

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Pengaruh model PBT terhadap kemampuan berpikir kritis dan kemampuan berpikir kreatif siswa SMAN 2 Magelang
Authors: Muskitta Marike , Djukri Djukri
Published: February 2017

Penelitian ini bertujuan untuk mengetahui pengaruh model pembelajaran berdasarkan masalah terhadap kemampuan berpikir kritis dan pengaruh model pembelajaran berdasarkan masalah terhadap kemampuan berpikir kreatif siswa pada materi pencemaran lingkungan. Penelitian ini dilaksanakan di SMA Negeri 2 Magelang. Metode penelitian yang digunakan adalah kuasi eksperimen dengan desain nonrandomized control group pretest-posttest. Analisis data menggunakan uji t. Hasil perhitungan perbedaan rata-rata posttest pada kedua kelompok untuk kemampuan berpikir kritis menunjukkan nilai hitung sebesar 2,45 dan ttabel dengan signifikasi 0,05% dengan dk 62 = 2,00 sedangkan untuk kemampuan berpikir kreatif menunjukkan nilai hitung sebesar 3,43 dan ttabel dengan signifikansi 0,05% dengan dk 62 = 2,00. Hasil perhitungan tersebut menunjukkan bahwa thitung > ttabel. Hal ini berarti hipotesis alternatif (Ha) diterima dan hipotesis nol (H0) ditolak. Dengan demikian, terdapat pengaruh penggunaan model pembelajaran berdasarkan masalah terhadap kemampuan berpikir kritis dan terdapat pengaruh model Pembelajaran Berdasarkan Masalah terhadap kemampuan berpikir kreatif siswa pada konsep pencemaran lingkungan.Kata Kunci: penggunaan model pembelajaran berdasarkan masalah, kemampuan berpikir kritis dan kemampuan berpikir kreatif. The Effect of the Problem-Based Teaching Model on the Critical Thinking Skills and Creative Thinking Skills of the Students of SMA AbstractThis study aimed to determine the effect of the use of problem-based teaching model on the critical thinking skills and effect of the use of problem-based teaching model on the creative thinking skills of students on environmental pollution materials. The research was conducted at SMAN 2 Magelang. The research method used was a quasi-experimental design with nonrandomized control group pretest-posttest. The data analysis used the t test. The result of the calculation of the posttest average of the difference between the two groups for critical thinking skills shows the calculated value of 2.45 and ttable with the significance level of 0.05% with 62 df = 2.00, while for the ability to think creatively the calculated value of 3.43 shows the ttable with the significance level of 0.05% with 62 df = 2.00. This shows that t > ttable. This means that the alternative hypothesis (Ha) is accepted and null hypothesis (H0) is rejected. Thus, there is an effect of the use of problem-based teaching model on the critical and creative thinking skills of the students on the concept of environmental pollution.Keywords: use of problem-based teaching model, critical and creative thinking skills.
Pattern of litterfall and return of nutrients in five Oak species of mixed Oak forest of Manipur, North-East India
Authors: Devi Ng. Lamnganbi , Singh E. Jadu
Published: February 2017

Litterfall and its nutrient return in five oak species were studied in the mixed Oak forest in Senapati District, Manipur .Litter production was measured by litter trap method. The total annual litterfall was 958.9 g m-2yr-1.Leaf and non leaf litterfall comprises 76.7 % and 23.3 % of the total litterfall. Maximum litterfall was found in the month of April (193.5 g m-2) and minimum in the month of July (23.7 g m-2).About 70% of the forest floor was replaced each year with turnover time of 1.42 yr.The amount of nutrient return through leaf litter was found to be maximum in Q.polystachya and minimum in C.indica. Nutrients (NPK) concentration of leaf litter of five different tree species was varied among different tree species.
Фармакогенетичні аспекти дії метформіну у хворих на цукровий діабет 2-го типу
Authors: Pasechko N.V. , Oleshchuk O.M. , Loi G.Ya.
Published: February 2017

Цукровий діабет (ЦД) 2-го типу — повільно прогресуюче полігенне захворювання, що характеризується порушенням обміну речовин у результаті неефективності дії інсуліну в організмі. Метою лікування ЦД 2-го типу є мінімізація віддалених мікро- та макросудинних ускладнень шляхом покращання глікемічного контролю. Метформін залишається препаратом першої лінії для лікування ЦД 2-го типу і є одним із лікарських засобів, що найчастіше призначають пацієнтам у світі. Проте не у всіх випадках лікування метформіном є ефективним. У частини хворих при застосуванні метформіну рівень глюкози залишається високим, виникають серйозні побічні реакції. Така мінливість терапевтичної відповіді на метформін зумовлена поліморфізмом у генах, що кодують рецептори, транспортери і ферменти, відповідальні за його фармакокінетику. Наприклад, генетичні варіанти solute carrier transporters (SLC22A1–3, SLC47A1 і SLC47A2) значною мірою впливають на глікемічний контроль при лікуванні метформіном.
Сучасні погляди на алгоритм ведення пацієнтів з цукровим діабетом та еректильною дисфункцією
Authors: Pasyechko N.V. , Krytskyy T.I. , L.V. Naumova , Dzhula M.A. , Kulchinska V.M.
Published: February 2017

Цукровий діабет (ЦД) поширений у всіх країнах світу. За даними Всесвітньої організації охорони здоров’я, в наш час на планеті налічується понад 415 млн хворих на ЦД і їх число прогресивно зростає. Така ж тенденція характерна і для України, де на сьогодні налічується понад 1,3 млн хворих. З огляду на хронічний невиліковний перебіг ЦД і збільшення середньої тривалості життя пацієнтів актуальними є дослідження, спрямовані на вивчення стану різних органів і систем, зокрема статевої функції у чоловіків. За останні роки досягнуто значних успіхів у розумінні діагностики та ефективного лікування статевої дисфункції. Однак розлади статевої функції при ЦД, що значно знижують якість життя пацієнтів, залишаються тривалий час не виявленими внаслідок того, що пацієнти часто не скаржаться на порушення статевої функції. Слід зазначити, що навіть думки про ці розлади погіршують психічний стан хворих, а це призводить до погіршення вуглеводного обміну. Отже, активне виявлення та вивчення характеру еректильної дисфункції у хворих на ЦД дозволить не тільки аргументовано вибирати методи лікування, що буде сприяти підвищенню якості їх життя, але й більш раціонально проводити профілактику розвитку інших нейрогенних і судинних ускладнень основного захворювання. Не менш важливою є організація надання медичної допомоги чоловікам з порушеннями статевої функції.