bluuebunny/crossref_metadata_2025 huggingface dataset:
Successful Application of Clean Fracturing Fluid Replacing Guar Gum Fluid to Stimulate Tuffstone in San Jorge Basin, Argentina
Authors: Hai Qu , Liancheng Ren , Wenhao He , Tingxue Jiang , Yiming Yao
Published: January 2018

Hydroxypropyl guar (HPG) fluid, which is widely used in San Jorge Basin due to it is inexpensive and able to carry high concentration proppants, has more residue to damage matrix. As the permeability of tuffstone is very low, fracturing fluid that are low-damaging to the proppant pack and formation are becoming important. This paper presents the development of a low damage fracturing fluid instead of HPG and the results of successful field applications.

This clean fracturing fluid uses a low-residue polymer crosslinked with zirconium having a pH of less than 10 to minimize damage and residue encountered using other fluids. The fluid was tested for rheological properties and retained permeability which was used to evaluate the compatibility of two types of fracturing fluids with formation cores at reservoir temperature. The use of regain permeability was evaluated fluids. In addition, broken fluids were tested to figure out the amount of residue.

The clean fracturing fluid was expected to generate low damaging effects on tuffstone in order to increase reservoir productivity. During development, the fluid remained stable for approximately 2 hours at 120°C with a gel loading of 5 kg/m3. The target reservoir temperature ranges from 90°C to 120°C. Additional testing optimized gel loading at 4 kg/m3. The viscosity of crosslink fluids after 1 hour shear was stable about 60mPa·s at 170 sec−1, which was much lower than HGP with 200mPa·s. The fluid suspended the proppant for approximately 2 hours. Less than 120 mg/L residue concentration was formed after fluid breakdown, which was much lower than the residue generated by HPG. A regained permeability of 88% was obtained from a sandstone core, which demonstrates the low-damaging nature of the fluid. However, the regained values of HPG were below 50% that means more than half of fracture conductivity and matrix permeability surround fracture will be lost, even HPG could carry higher concentration proppant into fracture. Four vertical wells in same work area were designed and executed successfully to compare two fluids. The well stimulated by low damage fluid got very good production, which was 2-8 times of adjacent wells.

This work provides critical insights into understanding the performance of using clean fracturing fluid to mitigate formation damage in tight formations. It is an excellent candidate for fracturing operations and can help operators maintain low costs per barrel of oil equivalent.
Estimating Sand Production Through Gravel Packs
Authors: Wu Chu-Hsiang , Sharma Mukul M. , Fuller Michael J. , Mathis Steve
Published: January 2018

A new approach for estimating sand production through gravel packs is presented in this paper. The approach involves two steps: (a) evaluating the pore throat size distribution (PoSD) of a gravel pack and (b) estimating sand production through the gravel pack using an analytical model. Results of the analytical model are compared with sand production data obtained from lab experiments and Monte Carlo simulations.

The PoSD of a gravel pack is evaluated using the discrete element method (DEM). The process includes generating a random close packing of gravel based on the gravel particle size distribution (PSD) and evaluating the pore throat size distribution (PoSD) in each layer of the gravel pack. The evaluated gravel pack PoSD is then used to compute the filter efficiency of the pack for various formation sand sizes. Sand production through the gravel pack is predicted analytically by applying the filter efficiency data to any given formation PSD under the assumption that straining is the dominant sand-retention mechanism for a gravel pack.

Results from DEM simulations show that the smallest and largest pore throats in a gravel pack are typically sized around 1/9 and 1/4.8 to 1/5.5 of the effective gravel diameter (Deff), respectively. These observations suggest that any formation sand grains larger than 1/5.5 Deff will be retained near the sand-gravel interface, i.e. within 10 layers of gravel from the sand-gravel interface. Furthermore, the gravel pack alone cannot retain any formation sand smaller than 1/9 Deff for a typical thickness of the gravel pack. A secondary pack formed by retained formation sand is essential for effective sand retention in such cases. Increasing gravel packing thickness primarily improves the retention of sand sized between 1/5.5 to 1/9 Deff, and the effect is insignificant for sand out of this size range. Finally, the analytically estimated sand production using DEM-evaluated PoSDs agrees reasonably well with sand production data obtained from lab experiments and Monte Carlo simulations.

The proposed approach provides a time and cost-efficient way to predict the effectiveness of a gravel pack for any given formation sand size distribution. The approach accounts for the gravel particle size distribution and the thickness of the annular gravel pack. Application of this new approach can improve the reliability of sand control completions by better justifying a gravel design, specifically in reservoir sands with poor uniformity (i.e., high-fines).
The Real World isn't Perfect: An Investigation into Wellbore Clean-Up with Non-Uniform Filtercake Exposure
Authors: Fischer Christine
Published: January 2018

Soft sand wells are typically more expensive completions due to the need for sand control. The cost of the wells makes the completions more high-risk and increases the need for laboratory testing to validate the screen or gravel pack sizing as well as drill-in fluid selection and filtercake cleanup. Dynamic drill-in fluid clean-up testing provides a state of the art methodology for determining the least damaging drill-in fluid and / or the most effective clean-up treatment for the filtercake. However, the test method to date, referenced in SPE 112497 and SPE 179024 has used a 100% uniform clean-up treatment approach. This approach has assumed that all of the clean-up treatment uniformly contacts and treats the filtercake. In the actual well, it is unlikely that 100% uniform clean-up exists. It is possible in the wellbore to encounter selective clean-up treatment leakoff due to permeability differences or variable filtercake thickness. This paper investigates the results when a less uniform clean-up environment is encountered.

The dynamic drill-in fluid testing utilizes designed-for-purpose slot flow cells which allow soft sand formations to be confined and tested while still exposing the face of the formation directly to the drill-in fluid or clean-up treatment during the test. The well conditions are received from the client and the shear rate at the formation face is calculated and matched in the laboratory. The test simulates wellbore conditions as closely as possible including annular shear rate during filtercake deposition, overbalance pressure, temperature and multiple clean-up flushes. In this study, the amount of filtercake clean-up treatment fluid loss was modified to simulate multiple effective clean-up scenarios. Additionally, testing was completed on aloxite discs in a standard HPHT fluid loss cell in order to provide a comparison between the dynamic and static tests.

The dynamic fluid loss testing has been designed to match treatment volumes and conditions in the actual wellbore as closely as possible. The assumption that 100% uniform application of the clean-up treatment contacting the filtercake has always been the basis for the testing. However, changing the previous assumptions to allow for non-uniform application of the clean-up treatment during the testing provides another opportunity to challenge our perceptions and simulate the actual well more completely.

The modification of the standard test procedure to allow the simulation of non-uniform clean-up of the filtercake in the wellbore adds further to our understanding of the actual wellbore clean-up. The relationship of the results between the static and dynamic fluid loss provides an opportunity for pre-screening work to be conducted and related to the final results achieved in the dynamic fluid loss test.
A New Tool for Formation Damage Management
Authors: Restrepo A. , Romero R. D. , Calle J. M. , Espinosa K. Y. , Mejía J. M.
Published: January 2018

Formation damage is one the most frequent problems governing well productivity. An adequate workflow for data management and surveillance of the well, and specialized tools for damage mechanisms diagnosis becomes mandatory for reservoir and productivity engineers. This paper presents the software application IFDM (Integrated Formation Damage Model), a web platform for reservoir surveillance in order to manage formation damage including specialized modules for statistical and analytical damage characterization and discretization, data management, and geovisualization tools.

The IFDM platform is developed under the framework Laravel taking advantage on its web characteristics. A centralized database is used to integrate the specialized modules with data management module increasing the knowledge base in order to make more accurate analysis in wells and fields of interest. Specialized modules are based on statistical and analytical approaches for the purpose of disaggregate formation damage in its different components and calculates formation damage caused by organic scales and fines migration. In addition, data management and geovisualization modules use real-time interaction with users for trends identification in specific areas.

The IFDM application provides the tools for a complete analysis of the condition of wells and fields in real time. Furthermore, data management and geodata visualization modules ease decision-making process in order to prevent and intervene the fields and wells in a prompt and accurate manner. The IFDM application has driven formation damage study in several Colombian fields. Such tool has facilitate managing the assets of the company by promoting a culture of data management and the quality assurance of critical data. In addition, the web application extends its database automatically by the interaction with multiple users storing and analyzing historical petrophysical, chemical and production data for earlier identification of threats that might affect the productivity of the well. This is important in reservoir surveillance because of an early intervention could optimize and increase the crude oil productivity in Colombian fields.

The novelty of the IFDM web application is in the possibility of characterize and discretize formation damage in a centralized manner. The IFDM application provides an increasing database allowing more accurate analysis based on real-time interaction with the platform. In addition, due to its web characteristics and adaptable architecture, the IFDM eases its usage and implementation in companies worldwide.
Geochemical and Geomechanical Alterations Related to Rock-Fluid-Proppant Interactions in the Niobrara Formation
Authors: Iriarte Jessica , Tutuncu Azra N.
Published: January 2018

Fracture conductivity degradation results from damage mechanisms and fluid interactions that occur during and after hydraulic fracturing treatments. Rock softening and associated proppant embedment are among the damage mechanisms affecting this degradation. The aim of this research study is to understand the physico-chemical interactions between fracturing fluid and formation to investigate the associated geomechanical property changes taking place in the Niobrara shale, a calcium carbonate rich formation, during and after hydraulic fracturing treatments.

Experimental tests were carried out on Niobrara core samples to investigate the effects of chemical interactions between the formation, fracturing fluid, and proppant along with static and dynamic geomechanical property changes. The samples were characterized using X-Ray Diffraction (XRD), X-Ray Fluorescence (XRF), and Field-Emission Scanning Electron Microscopy (FESEM). Two sets of experiments were conducted: fluid chemical interactions with crushed rock and proppant, and geomechanical property variations in intact core samples. In the first set of experiments the changes in the composition of the solution were monitored as a function of saturation time. In the second set, the variations in the dynamic and static mechanical properties were examined in intact core plugs before and after they were saturated. Best practices for hydraulic fracturing fluid selection are established by incorporating the impact of the fracturing fluid on geochemical composition and geomechanical property changes in the formation.

This study provides an insight into how each selected fluid formulation yields unique interactions with the mineral composition of the formation. Distilled water shows to be more prone to dissolve elements affecting the strength of the rock, whereas 2% brine solutions, especially 2% KCl, dissolve elements that could be the source of scales, fines migration, other types of undesired precipitations, as well as elements related to organic matter in the reservoir rock. A comparison of the dynamic and static elastic moduli and fluid chemistry data obtained pre- and post- treatment indicate that there is a correlation between softening of the formation and the chemical interactions taking place in the rock. FE-SEM images further support this interpretation.

Hydraulic fracture treatment effectiveness in tight reservoirs can be improved by integrating multidisciplinary data. This study provides detailed geomechanical and geochemical analyses capturing associated changes in the rock and the fluid composition when they interact with each other. It also introduces a correlation between mineralogy and the mechanical properties of the rock proposing a simple approach to improve the fluid selection in hydraulic fracturing operations.
Influence of Transport Conditions on Optimal Injection Rate for Acid Jetting in Carbonate Reservoirs
Authors: Ridner Dmitry , Frick Taylor , Zhu Ding , Hill A. Daniel , Angeles Renzo , Vishnumolakala Narendra , Shuchart Chris
Published: January 2018

Acid jetting occurs as a result of pumping acid through limited entry liner completions, causing high velocity streams to impinge against the wellbore wall. The dissolution effect of jetting differs significantly from conventional matrix acidizing. Acid jetting causes cavities to be formed at the points of contact of the jet with the rock, with wormholes forming beyond the cavity. Jetting has been shown to be an effective technique for placing acid along extended reach laterals, removing filter cake, and enhancing wormhole propagation.

The velocity of the impinging jet and its standoff distance from the rock causes some of the acid to penetrate the formation and some to flow back in the annular space of the liner. Two types of dissolution mechanisms occur: surface dissolution forming the cavity, and matrix dissolution forming the wormholes. These dissolution mechanisms are highly dependent on acid injection rate, velocity of the jet, temperature, and permeability of the formation. The differences between the matrix dissolution mechanism of acid jetting and that of conventional matrix acidizing are most obvious at low acid injection rates.

Experiments were performed with the intention of quantifying the difference in pore volume to breakthrough between acid jetting and matrix acidizing, as well as determining the effect of increased temperature, rock permeability and acid concentration on this value with respect to acid injection rate. Baseline parameters of room temperature, 15% HCl and 2-4 mD Indiana limestone were individually compared with experiments run at 180°F, 28% HCl, and Indiana limestone cores of 30, 60 mD, and 140 mD. The effect of jetting velocity was also investigated by changing the diameter of the orifice from which the stream exits. Direct comparison with conventional matrix acidizing was made by eliminating the jetting effect of the stream through mechanical dispersion.

Acid jetting creates a point of heightened interstitial velocity at the contact of the acid and the rock, causing wormhole propagation to happen at a faster rate than it would in conventional matrix acidizing at that injection rate. This effect is especially pronounced as jetting velocity is raised above that of matrix acidizing, and tapers off at progressively higher jetting velocities.
The Impact of the Fracturing Fluid Spontaneous Imbibition on the Petrophysical Properties of Low Permeability Reservoirs
Authors: Al-Ameri Aymen , Gamadi Talal , Watson Marshall
Published: January 2018

In the present study, spontaneous imbibition experiments, steady-state permeability measurements, and numerical simulation are integrated to quantify the changes in the effective water permeability, capillary pressure and water relative permeability curves due to the polymer adsorption of the spontaneously imbibed fracturing fluid. The effect of the surfactant and core bedding plane on the fluid spontaneous imbibition volumes were also investigated.

The researchers considered a spontaneous imbibition of a 0.1 wt% friction reducer fluid into low-permeability sand core samples extracted from Scioto, Crab Orchard, and Kentucky outcrops. Three comparative systematic spontaneous imbibition experiments were conducted for each of the core samples using distilled water, friction reducer fluid, and distilled water again. Prior to each experiment, the core sample was cleaned with toluene and then dried completely. The core sample water permeability before and after the imbibition experiment was measured using a constant rate steady-state permeability apparatus.

The results showed that the polymer adsorption throughout the fracturing fluid spontaneous imbibition significantly reduces the water spontaneous imbibition volumes. Moreover, the polymer adsorption effect increases as the porosity increases. The results showed also that the effective water permeability is decreased because of the polymer adsorption effect. The Residual Resistance Factors calculated from the spontaneous imbibition experiments are in agreement with the values calculated from the constant rate permeability measurements.

Adding surfactant to the pad stage- friction reducer fluid increases its spontaneously imbibed (leak-off) volumes. The results showed also that the effect of polymer adsorption on the imbibition rates is significantly less when the rock-fluid contact surface is parallel to the bedding plane.

The imbibition potentials were calculated before and after polymer adsorption. Since the water permeability was calculated independently, the capillary pressure curves were calculated from the imbibition potentials. The results showed polymer adsorption leads to a slight increase in the capillary pressure. The spontaneous imbibition experiment is numerically simulated using ECLIPSE commercial simulator and the imbibition water relative permeability curves were calculated by matching the results to the water spontaneous imbibition experimental data. The results showed that the polymer adsorption significantly reduces the water relative permeability curves for Scioto and Crab Orchard.
ROLE OF RELIEF MORPHOMETRIC PARAMETERS ON THE AGRICULTURAL DEVELOPMENT IN THE MOUNTAIN GEOSYSTEMS OF THE SOUTH-EASTERN SLOPE OF THE GREATER CAUCASUS
Authors: Гаджиева Гюльнар , Gadzhieva Gyulnar , Эюбова Зулейха , Eyubova Zuleikha
Published: January 2018

Natural geosystems of the south-eastern slope of the Greater Caucasus are genetically related to the large morphostructural units that constitute the territory, as well as to the aerodynamic condition of the lower layer of the troposphere. The study revealed that there are contradictions in the geosystems formation of various local morphostructures. Thus, the differentiation of geosystems may either be intensifi or weakened, depending on the height of mountain areas and ridges. The slope and direction of visibility of the area are the basic elements that play a decisive role in the shaping of structural and genetic features of the area in question. The article features the structural changes that are observed in natural geosystems based on the slope and direction of visibility maps and charts of the contemporary geosystems in the south-eastern slope of the Greater Caucasus. The research also features the infl of morphometric parameters of the relief on the agriculture development in the mountain geosystems of the south-eastern slope of the Greater Caucasus in GIS.
PROTECTED ORCHIDS IN THE KEMEROVO DISTRICT
Authors: Ковригина Любовь , Kovrigina Lyubov , Филиппова Александра , Filippova Alexandra , Романова Наталья , Romanova Natalia , Монгуш Буяна , Mongush Bujana
Published: January 2018

Of the 27 species of orchids growing in the Kemerovoregion, 20 are included in the Red books of The Russian Federation and the Kemerovoregion. An objective assessment and development of effective protection measures involves consideration of the location, population assessment and evaluation of the conditions. The article features characteristics of species composition, biomorphs, ecological features of the protected Orchidaceae species in the Kemerovodistrict. The research focused on the population status of Dactylorhiza fuchsii (Druce) Soo and Orchis militaris L. at the time of their fl The process involved setting transects consisting of 25 adjacent square pads with an area of 1 m2 each. The number of specimen was calculated on each site; their age and status were determined; the height of fl plants, the length of the infl and leaf were measured. Juvenile, immature, virginile and generative specimen were defi in each population of orchids. The authors determined the vital status of specimens, characterized the age and vitality spectrum, as well as the spatial structure of the populations. The population status Orchis militaris L. is defi as satisfactory, whereas the population of Dactylorhiza fuchsii (Druce) Soo was assessed as bad.
URBAN ENVIRONMENT QUALITY ASSESSMENT OF THE PROKOPIEVSKY CITY DISTRICT
Authors: Егорова Надежда , Egorova Nadezhda , Зинковская Анастасия , Zinkovskaya Anastasia
Published: January 2018

The article gives the urban environment quality assessment for the administrative entities of the Prokopyevsky urban district. The assessment is based on the methodology developed by V. N. Fedorov and M. Yu. Aksenova. The main indicators for assessing the urban environment quality were: environmental comfort, assessed through the perception of the environmental tension level by Prokopyevskresidents; population provision with social infrastructure facilities that are active components of social relations and act as carriers, forms and ways of meeting common individual demands. Two options for calculating the transport city center accessibility indicated the level of transport infrastructure development: that for vehicle owners and that for public transportusers.Asabasisforassessingtheurbanenvironmentaestheticqualities, the V. A. Nikolaeva method was used. For greater results comparability, scoring scales are used. At the same time, respondents were asked to determine the attractiveness degree and emotional impact of the each district urban environment. The total contribution of the urban environment quality objective factors was estimated with the help of the urban environment integral quality factor.
DEVELOPMENT OF THE DIMENSIONAL MODULE (GIS-PROJECT) OF THE ECOLOGICAL FRAMEWORK FOR THE BOGRADSKY DISTRICT, THE REPUBLIC OF KHAKASSIA
Authors: Тисейко Регина , Tiseiko Regina
Published: January 2018

The current paper describes the basics of the ecological framework theory as a tool aimed at improving functional target characteristics of the regional network in protected areas. It introduces a brief analysis of the experience in the environmental framework development in various subjects of theRussian Federation. The research used ARC GIS 10.1. software to create a spatial ecological framework module for the Bogradsky district (theRepublicofKhakassia). The article offers brief geographical and environmental characteristics of the area as the basis of the content of the information model. The novelty of the research is in its comprehensive and systematically structured approach to the development of the ecological framework, which encompasses the elements of the network of protected areas together with objects of protected natural areas associated with different species of wildlife. The article contains a list of elements included in the spatial GIS module within the project «The Ecological Framework of the Bogradsky District, theRepublicofKhakassia». The project can be a useful tool for inventory, monitoring and development of protected areas
Quality of Vancomycin for Injection Formulations in Brazil
Authors: Secco Gabriela , Sachetti Cristiane , Rossato-Grando Luciana Grazziotin , Regina Hahn Siomara , Pagnussat Lidiane Riva , da Cruz Fresco Paula Maria Façanha , Dallazem Bertol Charise
Published: January 2018

Background:

The presence of impurities in vancomycin compromised the safety and contributed
to decrease of its use for years. In Brazil, vancomycin generic drug represents an option to reduce
hospital costs. However, the controversy over the quality of these formulations and their relationship
to effectiveness and safety raised concerns.

Objective and Methods:

To assess in vitro quality of vancomycin injections through uniformity of
weight, pH, clarity of solution, microbiological assay and impurities determination by High Performance
Liquid Chromatography (HPLC).

Results:

The samples were approved in the tests.

Conclusion:

The injectable formulations of vancomycin proved to be safe for use in hospital environment.
This work contributes to increase health professionals’ confidence on generic vancomycin.
A Case of Schwannoma of the Submandibular Region
Authors: Bamgbose Babatunde O. , Sato Akiko , Yanagi Yoshinobu , Hisatomi Miki , Takeshita Yohei , Sugianto Irfan , Asaumi Junichi
Published: January 2018

Background:

We herein described a rare case of schwannoma of the hypoglossal nerve in the submandibular region with diagnostic imaging and histopathological findings.

Case Report:

A 31-years-old woman has had a palpable firm, rubbery, freely mobile mass in the submandibular region. Of imaging, MR images showed homogeneous isointensity on T1-weighted imaging (T1-WI), heterogeneous hypointensity on T2-WI, heterogeneous hyperintensity on short T1 inversion recovery (STIR), and heterogeneous enhancement on contrast-enhanced T1-WI. A clear capsule was observed on the margin and showed hypointense on T2-WI. Dynamic MRI showed heterogeneous gradual increased enhancement. The uptake of contrast medium was regionally slow. Diagnostic imaging using CT and MRI was suspected of salivary gland tumor or neurogenic tumor. In consideration of imaging diagnosis, a pleomorphic adenoma or a schwannoma was suspected. Final diagnosis was confirmed on the basis of histopathological finding and intraoperative findings.

Conclusion:

1. Histopathologic examination is inevitable, because MR findings are not specific.

2. Schwannomas were said to have specific MRI properties, including specific signs (split-fat sign, fascicular sign, target sign). However, they are not always observed.

3. This case confirmed the differential diagnosis on the basis of the intraoperative finding that the tumor was continuous with the hypoglossal nerve.
Evaluasi dampak pendidikan dan pelatihan pengembangan keprofesian berkelanjutan guru Matematika di PPPPTK Matematika Yogyakarta
Authors: Wijaya Adi , Sumarno Sumarno
Published: January 2018

Penelitian ini bertujuan untuk mendeskripsikan dampak pendidikan dan pelatihan Pengembangan Keprofesian Berkelanjutan (PKB) guru matematika yang diselenggarakan di PPPPTK Matematika tahun 2013 dan 2014 terhadap perubahan perilaku alumni dalam melakukan kegiatan PKB yang meliputi: (1) bentuk kegiatan PKB setelah diklat, dan (2) kendala/hambatan dalam melakukan kegiatan PKB. Penelitian ini merupakan penelitian evaluasi dengan menggunakan model Empat Level Kirkpatrick. Sampel penelitian ini adalah alumni Diklat PKB Guru Matematika tahun 2013 dan 2014. Data dikumpulkan menggunakan kuesioner yang dikirimkan melalui pos, observasi, dan wawancara terstruktur. Data dianalisis menggunakan analisis statistik deskriptif. Hasil penelitian menunjukkan diklat PKB yang diselenggarakan PPPPTK Matematika belum berdampak banyak terhadap perubahan perilaku alumni. AN EVALUATION OF THE IMPACT OF EDUCATION AND TRAINING ON CONTINOUS PROFESSIONAL DEVELOPMENT OF MATHEMATICS TEACHERS IN PPPPTK MATHEMATICS OF YOGYAKARTAAbstractThis study aims to describe the impact of education and training on Continous Professional Development (CPD) of mathematics teachers held by PPPPTK Mathematics of Yogyakarta in 2013 and 2014 which includes: (1) the form of CPD activities after training, and (2) the reason for not conducting CPD. This study is evaluation research using Kirkpatrick’s Four-Level Model. The sample was participants of education and training on Continous Professional Development (CPD) of mathematics teachers held by PPPPTK Mathematics of Yogyakarta in 2013 and 2014. The data were collected using questionnaires sent by mail and structured interviews, and analyzed using the descriptive analysis. The results show that education and training on Continous Professional Development (CPD) of mathematics teachers held by PPPPTK Mathematics of Yogyakarta in 2013 and 2014 do not have much impact on alumni’s behavioral change.
DIASPORA IMAGINATION AND EXPERIENCE SHORT STORIES INTERPRETER OF MALADIES AND UNACCUSTOMED EARTH
Authors: Bhatt Surbhi , Rao Mahipal Singh
Published: January 2018

Stories of Jumpha Lahiri are the evidence of immigrant lives, their displeasures, disenchantment, struggles, dreams, integrations, etc. Immigrant experience, as well as identity, really is without question the elements of Interpreter of Maladies which have been explored possibly the most by researchers. In the stories in Unaccustomed Earth have been commended for presenting different aspects of the Bengali diasporic sensibility. The eight stories in the collection show the quest for identity in the diasporic situation. They scrutinize numerous identities as well as a dilemma in the lives of immigrants. This article will study the short story about the immigrants those who have to live their homeland by the Indian-American writer Jhumpa Lahiri, two of those three works, Interpreter of Maladies (1999) and Unaccustomed Earth (2008), are short story collections and are some of the very well known ones.
Analysis of XII Std. English Textbook In The Perspective of Sustainable Development
Authors: Jadhav Shobha , Kalekar Sunil
Published: January 2018

This paper is research based and is related to sustainable development. Sustainable development is very important concept which was presented by World Commission on Environment and Development in their 1987 report. It we want to make the world strong then the education for sustainable development is very important. Education for sustainable development makes students understand the importance of relationships, and everyone and everything is connected. Students need opportunities to become meaningfully and authentically engaged with community issues. Schools focusing on education for sustainable development can help create these opportunities. Schools can inculcate sustainability while teaching content by conducting various activities. In this paper the researchers tries to find out the hidden aspects of sustainability which are included in the English textbook of XII Standard and suggests some activities to inculcate sustainability.
Comparison of F.Y.B.Sc.MathematicsandPhysics student strength of M.V.P.S. Arts, Commerce and Science College, Nandgaon
Authors: Jamdade P. P.
Published: January 2018

This paper Compares F.Y.B.Sc. Mathematics andPhysics student strength of M.V.P.S. Arts, Commerce and Science College, Nandgaon. Dataof F.Y.B.Sc. Mathematics andPhysics student strength were collected from department of Mathematics andPhysics of last six years. The data wereanalyzedusingχ^2(Chi-square) test. Generally,students offering Physicsalso offer Mathematics butthe result is surprisingly different.
Web-Based Decision Aid to Assist Help-Seeking Choices for Young People Who Self-Harm: Outcomes From a Randomized Controlled Feasibility Trial
Authors: Rowe Sarah L , Patel Krisna , French Rebecca S , Henderson Claire , Ougrin Dennis , Slade Mike , Moran Paul
Published: January 2018

Background

Adolescents who self-harm are often unsure how or where to get help. We developed a Web-based personalized decision aid (DA) designed to support young people in decision making about seeking help for their self-harm.

Objective

The aim of this study was to evaluate the feasibility and acceptability of the DA intervention and the randomized controlled trial (RCT) in a school setting.

Methods

We conducted a two-group, single blind, randomized controlled feasibility trial in a school setting. Participants aged 12 to 18 years who reported self-harm in the past 12 months were randomized to either a Web-based DA or to general information about mood and feelings. Feasibility of recruitment, randomization, and follow-up rates were assessed, as was acceptability of the intervention and study procedures. Descriptive data were collected on outcome measures examining decision making and help-seeking behavior. Qualitative interviews were conducted with young people, parents or carers, and staff and subjected to thematic analysis to explore their views of the DA and study processes.

Results

Parental consent was a significant barrier to young people participating in the trial, with only 17.87% (208/1164) of parents or guardians who were contacted for consent responding to study invitations. Where parental consent was obtained, we were able to recruit 81.7% (170/208) of young people into the study. Of those young people screened, 13.5% (23/170) had self-harmed in the past year. Ten participants were randomized to receiving the DA, and 13 were randomized to the control group. Four-week follow-up assessments were completed with all participants. The DA had good acceptability, but qualitative interviews suggested that a DA that addressed broader mental health problems such as depression, anxiety, and self-harm may be more beneficial.

Conclusions

A broad-based mental health DA addressing a wide range of psychosocial problems may be useful for young people. The requirement for parental consent is a key barrier to intervention research on self-harm in the school setting. Adaptations to the research design and the intervention are needed before generalizable research about DAs can be successfully conducted in a school setting.

Trial Registration

International Standard Randomized Controlled Trial registry: ISRCTN11230559; http://www.isrctn.com/ISRCTN11230559 (Archived by WebCite at http://www.webcitation.org/6wqErsYWG)
Identifying Principles for the Construction of an Ontology-Based Knowledge Base: A Case Study Approach (Preprint)
Authors: Jing Xia , Hardiker Nicholas R , Kay Stephen , Gao Yongsheng
Published: January 2018

BACKGROUND

Ontologies are key enabling technologies for the Semantic Web. The Web Ontology Language (OWL) is a semantic markup language for publishing and sharing ontologies.

OBJECTIVE

The supply of customizable, computable, and formally represented molecular genetics information and health information, via electronic health record (EHR) interfaces, can play a critical role in achieving precision medicine. In this study, we used cystic fibrosis as an example to build an Ontology-based Knowledge Base prototype on Cystic Fibrobis (OntoKBCF) to supply such information via an EHR prototype. In addition, we elaborate on the construction and representation principles, approaches, applications, and representation challenges that we faced in the construction of OntoKBCF. The principles and approaches can be referenced and applied in constructing other ontology-based domain knowledge bases.

METHODS

First, we defined the scope of OntoKBCF according to possible clinical information needs about cystic fibrosis on both a molecular level and a clinical phenotype level. We then selected the knowledge sources to be represented in OntoKBCF. We utilized top-to-bottom content analysis and bottom-up construction to build OntoKBCF. Protégé-OWL was used to construct OntoKBCF. The construction principles included (1) to use existing basic terms as much as possible; (2) to use intersection and combination in representations; (3) to represent as many different types of facts as possible; and (4) to provide 2-5 examples for each type. HermiT 1.3.8.413 within Protégé-5.1.0 was used to check the consistency of OntoKBCF.

RESULTS

OntoKBCF was constructed successfully, with the inclusion of 408 classes, 35 properties, and 113 equivalent classes. OntoKBCF includes both atomic concepts (such as amino acid) and complex concepts (such as “adolescent female cystic fibrosis patient”) and their descriptions. We demonstrated that OntoKBCF could make customizable molecular and health information available automatically and usable via an EHR prototype. The main challenges include the provision of a more comprehensive account of different patient groups as well as the representation of uncertain knowledge, ambiguous concepts, and negative statements and more complicated and detailed molecular mechanisms or pathway information about cystic fibrosis.

CONCLUSIONS

Although cystic fibrosis is just one example, based on the current structure of OntoKBCF, it should be relatively straightforward to extend the prototype to cover different topics. Moreover, the principles underpinning its development could be reused for building alternative human monogenetic diseases knowledge bases.
Volatility Analysis on Producer Price of Red Pepper and Cayenne Pepper in West Java Province Indonesia
Authors: Noor Viana Candarisma Dhanes , Hartono Slamet , Waluyati Lestari Rahayu
Published: January 2018

This study aims to determine the price volatility in producer of red pepper and cayenne pepper in West Java Province. The data used in this research was secondary data focusing on monthly price statistics of red pepper and cayenne pepper producer in West Java Province from 2008 to 2015. The method used in this research was ARCH/GARCH method with best model determination. Based on the research, it was found that the best model for the price of red pepper in producer was GARCH (1,1) with the volatility value of 0,96. It means that volatility of price of red pepper in producer level was influenced by the increase and fluctuations on producer price of red pepper one month before. The best model for the price of the cayenne pepper producer was ARCH (1) with the volatility value of 0,52. It means that price volatility of cayenne pepper in producer level was also influenced by fluctuations producer price of cayenne pepper one month before. The value of volatility price of red pepper in West Java Province is closed to one, so it can be categorized of high volatility. Meanwhile, the price on the producer of cayenne pepper in West Java Province can be categorized of low volatility.
Analysis Competitiveness of Sugarcane Farming in Central Java and East Java
Authors: Saputro Wahyu Adhi , Masyhuri Masyhuri , Suryantini Any
Published: January 2018

This study aims to determine the competitiveness of sugarcane farming in Central Java and East Java based on comparative advantage (DRCR) and competitive advantage (PCR). The method used was the Policy Analysis Matrix (PAM). The result in Central Java explained that the sugarcane farming do not have comparative advantage but have competitive advantage. It is indicated by the value of Domestic Resource Cost Ratio DRCR>1 which is 1.23 and the value of Private Cost Ratio PCR<1 which is 0.71. Meanwhile The result in East Java explained that the sugarcane farming do not have comparative advantage but have competitive advantage. It is indicated by the value of DRCR>1 which is 1.05 and the value of PCR<1 which is 0.56. Partial test was conducted to find out how many respondents in each region in Central Java and East Java that have competitiveness sugarcane farming. Based on the partial test of each respondent in Central Java, about 51.67%, 45.00% and 3.33% of respondents are categorized as very competitive, medium competitiveness and very low competitive respectively. Meanwhile, in East Java Province, there are 25.00% of respondents with very high competitiveness, 65.00% medium competitiveness and 10.00% very low competitive.
Producción de las profesoras de la Universidad de Granada (España) en el último cuarto del siglo XX
Authors: MUÑOZ MUÑOZ ANA MARÍA
Published: January 2018

SE ESTUDIA LA PRODUCCIÓN CIENTÍFICA DE LAS PROFESORAS DE LA UNIVERSIDAD DE GRANADA DURANTE EL PERIODO COMPRENDIDO ENTRE 1975-1990 DESDE UNA PERSPECTIVA DE GÉNERO. A PARTIR DE UN ANÁLISIS CUANTITATIVO SE ANALIZA ESTA PRODUCCIÓN POR TIPO DE PUBLICACIONES: ARTÍCULOS, TESIS, COMUNICACIONES, MONOGRAFÍAS, CAPÍTULOS DE LIBRO, RESEÑAS, VIDEOS Y PATENTES; POR ÁREAS DE CONOCIMIENTO: CIENCIAS HUMANAS Y SOCIALES, CIENCIA Y TECNOLOGÍA Y CIENCIAS MÉDICAS Y DE LA VIDA; Y POR AÑOS. ADEMÁS, SE OFRECE UNA VISIÓN GLOBAL DE LOS RESULTADOS DE SU INVESTIGACIÓN MEDIANTE EL SEGUIMIENTO DE LA PRODUCCIÓN HASTA 1999. SE PRETENDE CONOCER LOS MEDIOS DE PUBLICACIÓN UTILIZADOS POR LAS PROFESORAS PARA DIFUNDIR SUS INVESTIGACIONES, LAS ÁREAS DE CONOCIMIENTO EN LAS QUE LAS PROFESORAS SON MÁS PRODUCTIVAS Y LA PRODUCTIVIDAD A TRAVÉS DE LOS AÑOS, TENIENDO EN CUENTA QUE EL ESTUDIO ABARCA UN PERIODO HISTÓRICO DE CAMBIOS "TRANSICIÓN POLÍTICA ESPAÑOLA".
La unificación en la descripción: el modelo FRBR y las RCAA2R
Authors: RODRÍGUEZ GARCÍA ARIEL ALEJANDRO
Published: January 2018

LA UNIFICACIÓN DE LA DESCRIPCIÓN CONSTA DE CUATRO PARTES (EL MODELO FRBR, EL ANÁLISIS DE LAS RCAA2R, LA COMPARACIÓN Y LA UNIFICACIÓN EN LA DESCRIPCIÓN BIBLIOGRÁFICA) QUE, A SU VEZ, AGRUPAN VARIAS CONTRIBUCIONES SOBRE EL IMPACTO DEL FRBR. EL MODELO ES REVISADO DESDE SU ORIGEN Y TAMBIÉN SU ESTRUCTURA Y COMPONENTES; LAS RCAA2 SON EXPLICADAS A PARTIR DE LA REVISIÓN QUE HACE DELSEY CON BASE EN LA PROPUESTA DEL MODELO. LA COMPARACIÓN QUE SE HACE ES ENTRE EL MODELO Y LAS REGLAS DE CATALOGACIÓN, Y LA UNIFICACIÓN IMPLICA LA YUXTAPOSICIÓN ENTRE LOS COMPONENTES DE AMBAS PROPUESTAS. ESTE CONJUNTO DE ELEMENTOS SE DESARROLLA PARTIENDO DE LA IDEA DE QUE EL REGISTRO BIBLIOGRÁFICO DEBE RESPONDER A LAS NUEVAS EXIGENCIAS QUE TIENEN LOS USUARIOS AL NAVEGAR EN EL UNIVERSO BIBLIOGRÁFICO, Y A LOS CAMBIOS PARADIGMÁTICOS QUE SE HAN DADO EN LA CATALOGACIÓN.
Seminario lectura: Pasado, Presente y Futuro
Authors: GONZÁLEZ ORTIZ FRANCISCO XAVIER
Published: January 2018

Seminario lectura: Pasado, Presente y Futuro
La brecha digital y sus determinantes
Authors: CASTRO MARTHA
Published: January 2018

La brecha digital y sus determinantes
Entre la voz y el silencio. La lectura en tiempos de Cervantes
Authors: GONZÁLEZ ORTÍZ FRANCISCO XAVIER
Published: January 2018

Entre la voz y el silencio. La lectura en tiempos de Cervantes
The relationship between adolescent academic stress and sleep quality: A multiple mediation model
Authors: Yan You-Wei , Lin Rong-Mao , Su Yan-Kui , Liu Ming-Yan
Published: January 2018

We investigated the mediating effect of burnout and depression on the relationship between adolescent academic stress and sleep quality. Participants comprised 757 adolescents aged 12–18 years, who completed self-report questionnaires assessing academic stress, sleep quality,
school burnout, and depression. Results showed that adolescent academic stress was negatively correlated with sleep quality, and that depression and school burnout were also negatively associated with sleep quality. Results of a multiple mediation model showed that adolescent academic stress
was not only directly correlated with sleep quality, but was also indirectly associated with sleep quality through the mediating effect of school burnout and depression, as well as through the sequential mediating effect from school burnout to depression. Theoretical and practical implications
are discussed.
Fertility traits of autochthonous breeds of Mangalitsa, Moravka and Resavka
Authors: Radovic Cedomir , Petrovic Milica , Katanic Nenad , Radojkovic Dragan , Savic Radomir , Gogic Marija , Terzic Nenad
Published: January 2018

Objective of this paper was to evaluate phenotypic variability of fertility
traits of indigenous breeds of Mangalitsa (Swallow-Belly Strain
Mangalitsa-SBSM), Moravka breed (M) and Resavka (R). Indigenous pig
populations are usually constituted by a quite low number of active boars and
sows. Their pedigree information is lacking or absent, complete phenotypic
description is usually not available for most of these populations that are
very well adapted to specific local agro-climatic environments. In controlled
herds in period of four years, the average age at first farrowing (AFF) was
18.5 months with large variability of 5.9 months for Swallow belly
Mangalitsa. Less AFF (14.3 months) and less variability (4.4 months), in
relation to SBSM, determined for Moravka breed while for Resavka determined
age of 14.7 months with at least variability for this trait from 4.4 months.
The average number of piglets born alive (for a period of four years) of SBSM
was the lowest from 4.37 to 4.81; in case of M and R, this value was
significantly (P<0.001) higher (from 5.75 to 8.17 and for R breed 6.40 to
9.00). With average duration of suckling period (duration of lactation - DL)
of 52.92 days in the first year for the breed SBSM with the lowest number of
reared piglets (NRP=4.10) whereas the DL for M and R breeds was shorter (from
45.75 to 52.03 day) with a higher NRP (from 4.57 to 8.92 reared piglets).
Detection of subclinical mastitis in dairy cows using California and Draminski mastitis test
Authors: Galfi Annamaria , Radinovic Miodrag , Davidov Ivana , Erdeljan Mihajlo , Kovacevic Zorana
Published: January 2018

Control of udder health is an essential element in the process of safe milk
production. Thus through the mastitis control program dairy farms regularly
conduct measures of detection and prevention of udder diseases. Subclinical
mastitis is an important disease of dairy cows causing economic losses and
physical and chemical changes in milk. The aim of this research was to
evaluate the usefulness of the California and the Draminski mastitis test to
detect the subclinical mastitis in dairy cows. The efficacy of indirect
mastitis tests for diagnosis of the subclinical mastitis was determined by
comparing results of mastitis tests with bacteriological findings. The
experiment was conducted on two dairy farms (farm A and farm B) Holstein -
Friesian breed. A total of 245 quarter milk samples were examined, 95 quarter
milk samples with the California mastitis test from farm A and 150 quarter
milk samples with the Draminski mastitis test from farm B. A quarter milk
samples for bacteriological analysis were taken aseptically during the
morning milking in sterile test tubes. On farm A, bacteria growth has not
been detected in 46.32% (44/95) quarter milk samples, while on farm B
negative bacteriological findings have been found in 50.67% samples (76/150).
In present study, sensitivity of the California mastitis test (78.57%) is
higher than sensitivity of the Draminski mastitis test (74.32%). The
specificity of the California mastitis test and the Draminski mastitis test
is 82.05% and 30.26%, respectively. Efficacy of the California mastitis test
in detection of the subclinical mastitis in dairy cows is better than that of
the Draminski mastitis test, since accuracy of the California mastitis test
has been higher.