bluuebunny/crossref_metadata_2025_split huggingface dataset:
A Novel Viscoelastic Surfactant Fluid System Incorporating Nanochemistry for High-Temperature Gravel Packing Applications
Authors: Vaidya Nirupama , Lafitte Valerie , Makarychev-Mikhailov Sergey , Panga Mohan Kanaka , Nwafor Chidi , Gadiyar Balkrishna 
Published: January 2018

Abstract
Viscoelastic Surfactant (VES) fluids have been used in many openhole gravel packing applications with the shunt tube technique as they offer several advantages over polymeric fluids. However, existing VES fluids have temperature limitations. The objective of this work was to develop a new viscoelastic surfactant (VES) based fluid for gravel packing wells with temperature up to 325°F while retaining the advantages of existing VES fluids.
The new fluid system consists of a surfactant, a cosurfactant, and a nanoadditive. The performance of the new fluid system was evaluated in laboratory experiments up to 325°F. The properties studied and discussed in this paper are shear recovery time, rheology (viscosity versus shear rates), gravel suspension, and core retained permeabilities. The optimization of the final fluid formulation based on sensitivity of the target properties to concentration of each component is also detailed in the paper.
The new VES-based gravel pack carrier fluid incorporating a nanoadditive showed significantly improved performance at elevated temperatures compared with conventional fluids. In particular, while the conventional VES fluids do not meet the gravel suspension requirement, the new fluid system is able to suspend the gravel under static conditions up to 325°F. In addition, the viscosity at low shear rates is improved while the viscosity at high shear rates is comparable to existing VES fluids. Tests with outcrop cores of varying permeabilities demonstrated the fluid's minimal formation damage. The complete VES fluid system with nanoadditive was found to be compatible with both monovalent and divalent brines at densities up to 14.0 lbm/gal. As such, it is a more cost-effective alternative to xanthan-based carrier fluids, which are incompatible with inexpensive calcium brines and thus necessitate sodium bromide or formate brines depending on the density requirements. Based on the extensive laboratory study, it can be concluded that the new fluid system outperforms conventional VES gravel pack carrier fluids at high temperatures while retaining the benefits of the conventional VES fluids.
The new fluid system significantly extends the temperature limit of VES-based gravel packing carrier fluids. The fluid system can also be used with many completion brines and mixed at a wide density range, making it an excellent alternative to conventional polymeric fluids used in gravel packing applications.
Optimising Sand Control and Production Strategies in a Low Permeability Sandstone Oil Field
Authors: Daramola B. , Alinnor C. M. 
Published: January 2018

Abstract
This paper presents how the sand control and management strategies of an oil field were optimised after multiple well failures between 2014 and 2016. It describes the impact of the new strategies on oil production and net present value. Field E is a sandstone field with oil and gas-cap gas at initial conditions, and has been developed with 5 production wells, 2 water injection wells, and 2 gas injection wells.
The first nine wells were drilled from an offshore platform and completed with sand screens between 2012 and 2013. Production commenced in late 2013, and by the end of 2016, multiple sanding events had been reported and four of the five production wells had died. The asset team was tasked with diagnosing the cause of the well failures and developing solutions. Pressure data suggested that three of the failed wells had tubing restrictions, and the fourth failed well had a blockage upstream of the BHP gauge. The sand count data suggested significant sand production prior to well failures, and sand was also recovered from the separators.
Pressure transient analysis suggested that the field had a lower permeability than the pre-development estimate, and higher pressure drawdowns were needed to produce economic oil rates from the field. It was concluded that the well failures were most likely caused by the high pressure drawdowns, which pulled sand from the reservoirs, and led to screen breakage in at least two wells and screen plugging in one well. A decision was made to re-drill the failed wells in 2016, and complete them with frac-pack sand control solutions. The drilling and production performance of the first two new wells are presented in this paper. The asset team also implemented a new and improved sand management strategy in Field E.
This paper presents the lessons learnt from a new oil field impacted by sand production. It also outlines practical well diagnosis and sand management strategies, and presents simple methods of preserving well integrity and cash flow in oil fields struggling to manage sand production in a 40 USD/barrel oil price environment.
Encapsulating Biopolymer for Control of Clay and Fines Generation in Unconventional Reservoirs
Authors: Landis C. , Maley D. M. , Nelson J. , Blackmon M. , Madduri A .V. , Rodencal C. 
Published: January 2018

Abstract
The current trends to re-evaluate the need for traditional clay control additives and the interest in increasing hydrocarbon production from secondary fracture networks are leading to the use of more appropriate fluid compositions. Additives historically used to dehydrate or exchange interlayer cations in water-reactive phyllosilicates introduce instability in the reservoir matrix and have been used in shale reservoirs without thorough assessments of potential formation damage. Framing the need for clay control in these reservoirs solely on the need to control water-reactive clays led naturally to the removal of clay control additives from fluids during the recent downturn. While justified from a cost perspective, these simplified fluids were introduced without assessments of the impact of near colloidal (10-40um diameter) fines generation. Completion experts who realize the formation damage risk of fines generation recognized these problems.
This paper updates the industry on an approach to proportion clay control and shale stabilization with fluid design better aligned to reservoir mineralogy and the stress introduced on the reservoir during hydraulic fracturing. The paper reports swelling clay control and near colloidal fines evaluations from four world class unconventional oil & gas reservoirs in North America. Reproducible fundamental trends in CST and near-colloidal fines generation data are correlated to clay control additive type and use of oxidative breaker. Additionally, this new test method has the potential to be easily and commercially viable for rapid field evaluation to assess formation damage due to fines generation.
Primary productivity and climate change in Austrian lowland rivers
Authors: Zoboli Ottavia , Schilling Katerina , Ludwig Anna-Lena , Kreuzinger Norbert , Zessner Matthias 
Published: January 2018

AbstractThere is increasing evidence of water temperature being a key controlling factor of stream ecosystem metabolism. Although the focus of research currently lies on carbon emissions from fluvial networks and their potential role as positive climate feedback, it is also important to estimate the risk of eutrophication streams will be exposed to in the future. In this work, a methodological approach is developed to create a scientific basis for such assessment and is applied to two Austrian lowland rivers with significantly different characteristics. Gross primary productivity (GPP) is determined through the open diel oxygen method and its temperature dependence is quantified based on the metabolic theory of ecology. This relationship is combined with the outcomes of a climate change scenario obtained through a novel integrated modelling framework. Results indicate that in both rivers, a 1.5°C warming would provoke an increase of GPP of 7–9% and that such an increase would not be limited by nutrient availability. The results further suggest that the situation for the relatively shallow river might be more critical, given that its GPP values in summer are five times higher than in the deeper murky river.
Protein Sequence Comparison and DNA-binding Protein Identification with Generalized PseAAC and Graphical Representation
Authors: Li Chun , Zhao Jialing , Wang Changzhong , Yao Yuhua 
Published: January 2018

Aim and Objective:
The rapid increase in the amount of protein sequence data available
leads to an urgent need for novel computational algorithms to analyze and compare these sequences.
This study is undertaken to develop an efficient computational approach for timely encoding protein
sequences and extracting the hidden information.

Methods:
Based on two physicochemical properties of amino acids, a protein primary sequence was
converted into a three-letter sequence, and then a graph without loops and multiple edges and its
geometric line adjacency matrix were obtained. A generalized PseAAC (pseudo amino acid
composition) model was thus constructed to characterize a protein sequence numerically.

Results:
By using the proposed mathematical descriptor of a protein sequence, similarity
comparisons among β-globin proteins of 17 species and 72 spike proteins of coronaviruses were
made, respectively. The resulting clusters agreed well with the established taxonomic groups. In
addition, a generalized PseAAC based SVM (support vector machine) model was developed to
identify DNA-binding proteins. Experiment results showed that our method performed better than
DNAbinder, DNA-Prot, iDNA-Prot and enDNA-Prot by 3.29-10.44% in terms of ACC, 0.056-0.206
in terms of MCC, and 1.45-15.76% in terms of F1M. When the benchmark dataset was expanded
with negative samples, the presented approach outperformed the four previous methods with
improvement in the range of 2.49-19.12% in terms of ACC, 0.05-0.32 in terms of MCC, and 3.82-
33.85% in terms of F1M.

Conclusion:
These results suggested that the generalized PseAAC model was very efficient for
comparison and analysis of protein sequences, and very competitive in identifying DNA-binding
proteins.
Recurrent Oral Eosinophilic Ulcers of the Oral Mucosa. A Case Report
Authors: Sugaya Norberto , Martignago Fernanda , Pinto Decio , Migliari Dante 
Published: January 2018

Objective:
This article describes a case of an Oral Eosinophilic Ulcer (OEU) in an otherwise healthy 31-year-old white woman.

Introduction:
The importance of reporting this case was the presence of recurrent episodes with lesions appearing in different areas of the oral mucosa, a type of manifestation not commonly associated with this disease. A typical manifestation of OEU occurs as a single ulceration that goes into healing after an incisional biopsy, a procedure usually required for a proper diagnosis of the disease. In spite of trauma being suggested as the main culprit of OEU, the exact pathogenesis mechanism of this disease remains controversial.

Case report:
The pattern of the present case contradicts the usually common course of the disease, as the patient had experienced many recurrent episodes for almost 2.5 years, with the recurrences occurring even after biopsies performed during some of the relapses. Differential diagnosis included recurrent aphthous stomatitis, recurrent intra-oral herpes, autoimmune disease, Crohn’s disease and malignancy.

Conclusion:
Fortunately, the patient has been free of any recurrences for 1.5 years since the last biopsy was taken at the time she came to our clinic seeking treatment.
Pulpal and Periodontal Tissues Changes Associated with Le Fort I and Sagittal Split Ramus Osteotomies: A review
Authors: Lazaridis Konstantinos , Lazaridou Maria , Athanasiou Athanasios E. 
Published: January 2018

Introduction:
Le Fort I and sagittal split ramus osteotomies are the most commonly performed orthognathic surgery procedures on the maxilla and mandible, respectively.

Techniques:
Despite progress in the techniques, these procedures may still be associated with morbidity, expressed as inflammation, inadequate bony union, periodontal damages or in extreme cases even total bone loss.

Discussion:
Through a comprehensive review of the literature, the influences of maxillary and mandibular surgery on Pulpal Blood Flow (PBF), pulp sensitivity and pulp vitality are examined. Moreover, adverse effects of maxillary surgery on tooth color and periodontal tissues are also reported. The effects had a variety of expression. Concerning maxillary surgery, some studies showed an initial increase in PBF followed by a decrease to the baseline or even lower levels after 1-3 months. Other studies found an initial decrease in PBF followed by an increase soon after. There were also studies that showed no significant PBF changes, in contrast.

Conclusion:
Concerning mandibular surgery, a recent study showed a decrease in PBF immediately after sagittal split ramus osteotomy. Some authors detected tooth discoloration of maxillary teeth after Le Fort I osteotomy. Root resorption and root injury were also detected, but were of minor significance. Usually, these adverse effects derive from injury of the vessels of the palatal pedicle. This pedicle should be maintained intact for the avoidance of blood flow impairments. In addition, the descending palatine artery should be protected during maxillary surgery procedures in order to maintain the highest possible blood flow on the maxillary teeth.
Pengembangan tes ilmu pengetahuan alam terkomputerisasi
Authors: Suwarto Suwarto 
Published: January 2018

Penelitian ini bertujuan untuk: (1). Memaparkan karakteristik tes IPA yang dikembangkan, dan (2) memaparkan program komputer yang telah dikembangkan dalam menentukan skor tes siswa dengan teori tes modern. Tes IPA terdiri dari 600 butir soal dan telah diujicobakan di SMP se-Solo Raya dengan responden 1.800 siswa. Teknik analisis data yang digunakan adalah program R. Program komputer yang telah dikembangkan diujicobakan di SMP Negeri 4 Polokarto. Hasil analisis tes IPA dengan program R menunjukan: (1) tingkat kesulitan butir dalam kisaran -2,001 sampai 1,713, (2) daya beda butir dalam kisaran 0,553 sampai 2,394, dan (3) terkaan butir dalam kisaran 0,000 sampai 0,379. Program komputer yang dikembangkan dapat menentukan skor tes siswa menurut teori tes modern dengan baik. DEVELOPING OF COMPUTERIZED NATURAL SCIENCE TESTAbstractThis study is aimed at: (1) describing the caracteristics of Natural Science test developed, and (2) describing a computer program which had been developed to determine the test scores of students with modern test theory. Natural Science test consists of 600 items and had been tested in junior high school throughout Solo Raya with 1,800 respondents. Data analysis technique which was used is R programming. The computer program had been developed and tested in SMP Negeri 4 Polokarto (Polokarto 4 Junior High School). The results of the analysis of Natural Science program test with R programming show that: (1) item difficulty is in the range of -2.001-1.713, (2) discriminatory power of items is in the range of 0.553-2.394, and (3) the supposition of items is in the range of 0.000-0.379. The computer program developed can determine students’ test scores according to the modern test theory well.
Analisis Spasial Kejadian Malaria Dan Habitat Larva Nyamuk Anopheles spp di Wilayah Kerja Puskesmas Winong Kabupaten Purworejo
Authors: Nababan Resiany , Umniyati Sitti Rahmah 
Published: January 2018

Purpose: This study was to analyze risk factors with malaria case, to map the spatial distribution of malaria cases related to breeding habit to location spacing and to know the habitat of Anopheles sp. mosquito larvae in public health center Winong, district of Purworejo. Method: A case control study through geographic information system. Results: Temperature, humidity and rainfall variables have no correlation with malaria incidence. There was correlation between malaria incidence with the existence of breeding habitat, house wall condition and nighttime habit, whereas the presence of livestock, breeding site distance, the habit of wearing mosquito nets, the use of wire mesh, the use of mosquito repellent and the habit of visiting endemic areas have no relationship with malaria incidence. Night out habits were the highest risk factors associated with malaria incidence. Conclusion: There is no correlation between weather factor and malaria incidence. There is a relationship between the presence of larval breeding habitat, the condition of the wall of the house and the habit of going out at night with the incidence of malaria. There are 3 clusters in the work area of Puskesmas Winong and most cases are in the buffer zone area 1000 m distance.
Desarrollo embrionario del primer molar mandibular del ratón Mus musculus cepa albino suizo
Authors: Díaz Jhon Aymer , Sánchez Paola Andrea , Mejía Carlos 
Published: January 2018

Objetivo: Describir el desarrollo embrionario del primer molar mandibular del ratón Mus musculus de la cepa albino suizo.Materiales y métodos: Estudio observacional de tipo descriptivo sobre el desarrollo embrionario del primer molar mandibular de 22 embriones de ratón Mus musculus cepa albino suizo obtenidos delBioterio de la Facultad de Salud de la Universidad del Valle, con edades comprendidas entre E10.5 y E18. Los especímenes fueros fijados en solución de Bouin durante 24 horas, incluidas en parafina para obtener cortes sagitales y coronales a 4 micras, y finalmente teñidas con hematoxilina-eosina para ser analizadas a través de un microscopio óptico de luz.Resultados: Se realizó la descripción del proceso de morfogénesis dental a partir de los diferentes estadios embrionarios (E) y su respectiva correspondencia con los estadios de Theiler (TS), observando que el desarrollo del primer molar inferior se inicia en E12 a partir de los primeros engrosamientos de la lámina dental. En E12.5 se observa el desarrollo de estadio en yema dental. En E13.5 y E14 se observa el estadio en casquete dental. Finalmente, en E 14.5 se identifica el estadio en campana dental. Conclusiones: Según reportes tomados de la literatura previa sobre el desarrollo embrionario del primer molar mandibular del ratón Mus musculus cepa albino suizo del Bioterio de la Facultad de Salud de la Universidad del Valle, la morfogénesis dental es más temprana en paralelo a los estadios del desarrollo embrionario.
Effect of Electromagnetic Fields on Microbial Activity of a Bio-Fertilizer
Authors: REVISTAS SISTEMAS , Zuñiga Orlando , Jiménez Cristian , Benavides Jhony , Torres González Celina 
Published: January 2018

The level of microbial activity was evaluated in an organic substrate and over soil samples from the “El Limonar” county (Dagua, Valle del Cauca) to which it was applied the commercial bio-fertilizer Multibiol electromagnetically stimulated. Phase i of the experiment was conducted to determinate the best times of exposure and electromagnetic induction on the bio-fertilizaer applied to samples of an organic substrate (chicken manure).
Wyznaczanie ryzyka logistycznego zasady Just in time za pomocą zbiorów rozmytych
Authors: Ficoń Krzysztof 
Published: January 2018

W pracy przedstawiono koncepcję wykorzystania teorii zbiorów rozmytych A. Zadeha aplikowanej w strukturze tzw. rozmytych sterowników E. Mamdaniego do wyznaczania zintegrowanego ryzyka logistycznej zasady Just in Time. W tym celu ryzyko Just in Time zdekomponowano na trzy ryzyka cząstkowe dotyczące: ryzyka czasowo-przestrzennego, ryzyka jakościowo-ilościowego oraz ryzyka ceny rynkowej. Dla wyodrębnionych kategorii ryzyk cząstkowych zostały zdefiniowane właściwe zmienne lingwistyczne i odpowiadające im zbiory rozmyte (termy). Na podstawie mechanizmów sterowników rozmytych Mamdaniego wyznaczono aktualną dla przyjętych założeń wartość ryzyka logistycznej zasady Just in Time.
Effect of Methanolic Extract in Ointment and Powder of Kalanchoe Pinnata (Lamk) Leaf in Ointment towards Incision Wound Healing in Mice
Authors: Suprapto Adi K , Tih Fen , Evacuasiany Endang 
Published: January 2018

Wound is a very common thing that can happen to all people around the world. The purpose of this study is to investigate the effect of methanolic extract and powder of Kalanchoe pinnata (Lamk) leaf in ointment. The methodology is laboratoric experimental design. Six groups of mice (n=30) were incised for 8 mm and treated with different treatment: methanolic extract of Kalanchoe pinnata (Lamk) leaves in ointment (SEMDSB) 10%, SEMDSB 20%, Kalanchoe pinnata (Lamk) leaves powder in ointment (SSDSB) 10%, SSDSB 20%, vaseline album (ointment) as negative control, and povidone iodine ointment as positive control. Examination is carried out by measuring the width of wounds in mice every day until the wound interlocked. Data analysis used one way ANOVA continued by Tukey HSD with α=0,05. The result showed the average time for wound healing (in days) are: SEMDSB 10% (7.2), SEMDSB 20% (6.6), SSDSB 10% (8.8), SSDSB 20% (7.6), negative control (10.6), and positive control (7.8). SEMDSB 10%, SEMDSB 20%, and SSDSB 20% showed highly significant difference (p = 0,000) and SSDSB 10% showed significant difference (p=0,021) when compared to negative control. As conclusion, methanolic extract and powder of Kalanchoe pinnata (Lamk) leaves in ointment can accelerate wound healing time. Keywords: ointment, Kalanchoe pinnata (Lamk), wound healing, mice
A Case Report: Clozapine in Diabetic Patient with Bipolar Mood Disorder
Authors: Vera _ , Sitha Christine 
Published: January 2018

Depression and diabetes are often occur together and their morbidity has a significant impact of health outcomes. Antidepressants dan antipsychotics may cause metabolic abnormalities, as well as neurologic abnormalities. 52 years old diabetic woman presented to Immanuel Teaching Hospital with slurred speech. Since ten years ago, she had bipolar mood disorder, which was recently treated with clozapine. As patient consumed higher dose of clozapine (beyond her psychiatrist’s supervision), she had uncontrolled blood glucose level, fever, and slurred speech. The side effects of clozapine (weight gain, increased insulin resistance, dysarthria, fever) were discussed in this case report. During hospitalization, with strict supervision of clozapine use, the symptoms resolved. In diabetic patients with comorbid psychiatric disorders, a good collaboration between internist and psychiatrist is required to manage the patients effectively and comprehensively. Keywords: bipolar mood disorder, clozapine, diabetes mellitus, depression
Cluster modeling and coordination structures of Cu+ ions in Al-incorporated Cu-MEL catalysts – a density functional theory study
Authors: Ghambarian Mehdi , Azizi Zahra , Ghashghaee Mohammad 
Published: January 2018

A density-functional-based cluster modeling was implemented on the Al-incorporated Cu-MEL zeolite catalyst (Cu-ZSM-11) to probe the electronic, energetic and structural features of the active sites of the catalyst at the B3LYP/6-311+G* and M06/Def2-TZVP levels. The HOMO–LUMO energy gap fell into the range of 3.31–5.15 eV at TD-BH&HLYP/6-311+G* with the lowest magnitude for the I–Cu and M1–Cu clusters. Population-averaged values for the exchange enthalpy and binding energy were also calculated, being approximately 125 and 171 kcal/mol, respectively.