bluuebunny/crossref_metadata_2025_split huggingface dataset:
Reconstruction of Pipe Movement from Downhole High Frequency Measurements
Authors: Cayeux Eric , Seim Per , Solvi Lars Jørgen , Ulvik Håvard , Solbu Espen 
Published: May 2019

Abstract
The lateral movement of drill-pipes, while rotating, can be the source of diverse drilling problems, such as tool-joint wear, grinding of cuttings into a fine powder that is very hard to transport, formation instabilities. Yet, it is virtually impossible to estimate the sideway displacements of drill-pipes as soon as the distance is greater than a couple of stands from a measurement source, like a dynamic sub placed in the bottom hole assembly (BHA).
It is therefore tempting to place dynamic subs along the drill-string with the objective of detecting any pipe movements that could have a negative impact on the drilling operation. However, to be useful, the measurements must be made at a relatively high frequency, in practice above 80Hz, and with enough precision. For that reason, we have placed a dynamic sub that measures axial and tangential accelerations, rotational velocity, 2-axis bending moment, torque and tension, approximatively 300m behind the bit while drilling two 9 ½-in lateral sections of a horizontal multilateral well.
The dynamic sub sent rotational speed, torque and tension at 80Hz through wired-pipe telemetry and burst data for all the measurement channels were recorded in memory, for 10s at 800Hz every 15 minutes. We have been able to test a method to collect and interpret the high-speed telemetry data, i.e. 80Hz, and we have post-analyzed the burst memory data. A methodology has been developed to compensate systematic errors on the accelerometer sensors by taking advantage of the redundancy of the measurements present in the mechanical-sub. An interpretation software has been used to reconstruct the likely 3-dimensional pipe movement at the location of the measurement tool. The analysis has shown a surprisingly large variation of pipe movement patterns and astonishing fast changing levels of lateral movement throughout the two runs where the tool has been used.
With such a pipe reconstruction methodology at hand, it can be envisaged to perform the processing downhole, i.e. directly into the dynamic sub, and to transmit information about the 3-dimensional movement of the pipe. Such information would be valuable, when received in real-time from distributed sensors, to inform the drilling operational team about possible detrimental drill-pipe vibrations that are not necessarily associated with abnormally high accelerations.
Dissolvable Technology Enhances Operational Efficiency of Offshore Completion Operations on the NCS
Authors: Keerthivasan Vijay Kumar , Koløy Tom Rune 
Published: May 2019

Abstract
In a typical well completion system, retrievable plugs run on wireline are used to set production packers and thereafter, to perform leak testing of the upper completion tubing. There are significant costs and risks associated with these intervention operations to set and retrieve aforementioned plugs. This paper presents the development and implementation of a system using dissolvable technology that allows for interventionless packer-setting and tubing testing of upper completions. The solution developed is a packer-setting kit consisting of a seat profile and a dissolvable ball. The seat is run as part of the tubing string below the production packer. After landing the completion string, the dissolvable ball is dropped from surface to land on the seat profile below the packer. This ball-seat system holds pressure from above, thereby, enabling the production packer to be set and a leak testing of the tubing to be performed. Eventually, the ball dissolves completely in the presence of downhole packer fluids permitting start-up of production activities.
This paper documents the extensive qualification test program which was undertaken to qualify a dissolvable ball-seat system for one-such application. These tests were aimed to verify the capability of the packer-setting kit to fulfil the operational requirements (pressure rating, dissolution time periods) under the specific downhole conditions (packer fluid type, temperature). Following successful qualification testing, this solution was successfully implemented in 3 wells on the Norwegian Continental Shelf in 2018. Adopting this technology significantly improved operational efficiency by reducing well completion and intervention times along with associated costs. Consequently, this enabled earlier production start-up on these wells. The most challenging aspect of this new approach is the selection and qualification of a suitable dissolvable ball material appropriate for the application-specific requirements and operational constraints. The various steps and tests necessary to verify suitability of dissolvable technology for such applications are outlined in this work. Key operational considerations which need to be kept in mind when implementing this solution shall also be addressed.
Stretching Lower Completion Limits: Longest One Screen Run in Horizontal Extended Reach Drilling / Multilateral Well on Troll Field, North Sea
Authors: Qamar Mubashir , Vold Anders 
Published: May 2019

Abstract
The Troll field is in the Norwegian sector of North Sea at water depth 300 – 350 m. The field came on stream in 1995 and developed as subsea field. The field has been Norway's biggest oil producer the past five years. The shut-in wellhead pressure is around 140 bar and static temperature 70°C.
The 6 5/8’’ × 5 ½’’ screens were run in 8 ½ horizontal reservoir section in one run to target depth at 6345 m. The length of screen section was 4300 m. The success of this job is considered as the longest screen run in the company because of excellent teamwork between onshore engineering and offshore teams.
To date, all the wells on Troll field over target depth approx. 6200 m were completed with minimum two screen runs which involves extra tubular management, need for service company personnel & equipment for two screen runs.
The planning of this operation required a thorough design of the landing string to run the screens. This included checking previous experiences on the same rig and field to carefully analyze the torque and drag simulations to understand the buckling & weight limitations. It was crucial to use correct friction factor in the simulations and quality control the input parameters which can impact the available weight & buckling. In addition, the downhole data from tripping out of hole with 8 ½’’ drilling BHA prior to run the screens was also utilized to understand the well condition.
EEG beta-band spectral entropy predicts the effects of drug treatment on patients with herpes zoster
Authors: Wei Mengying , Liao Yuliang , Liu Jia , Li Linling , Huang Gan , Li Disen , Huang Jiabin , Xiao Lizu , Zhang Zhiguo 
Published: May 2019

Abstract
Background

Medication is the main approach for early treatment of herpes zoster (HZ), but it could be ineffective in some patients. It is highly desired to predict the medication responses in order to control the degree of pain for HZ patients. The present study is aimed to elucidate the relationship between medication outcome and neural activity using electroencephalography (EEG) and to establish a machine learning model for early prediction of the medication responses from EEG.

Methods

We acquired and analyzed eye-closed resting-state EEG data 1-2 days after medication from 70 HZ patients with different drug treatment outcomes (measured 5-6 days after medicaiton): 45 medication-sensitive pain (MSP) patients and 25 medication-resistant pain (MRP) patients. EEG power spectral entropy (PSE) of each frequency band was compared at each channel between MSP and MRP patients, and those features showing sigificant difference between two groups were used to predict medication outcome with different machine learning methods.

Results

MSP patients showed significantly weaker beta-band PSE in the central-parietal regions than MRP patients. Based on these EEG PSE features and a k-nearest neighbors (k-NN) classifier, we can predicate the medication outcome with 80% ± 11.7% accuracy, 82.5% ± 14.7% sensitivity, 77.7% ± 27.3% specificity and an AUC of 0.85.

Conclusion

EEG beta-band PSE in the central-parietal region is predictive of the effectiveness of drug treatment on HZ patients, and it could potentially be used for early pain management and therapeutic prognosis.
T2 formula in a highly myopic population, comparison with other methods and description of an improved approach for estimating corneal height
Authors: Idrobo Carlos Alberto , Santaella Gisella , Gutiérrez Ángela María 
Published: May 2019

Abstract
Background: To determine the accuracy of the T2 formula as applied to highly myopic eyes, to compare the T2 formula to the SRK/T and Holladay 1 formulas, and to describe possible ways to improve the estimation of corneal height and prediction error in two settings, the Hadassah Hospital, Ophthalmology Department, Jerusalem, Israel and Clínica Barraquer, Bogotá, Colombia. Methods: In this retrospective case series , optical biometer measurements were taken for 63 highly myopic patients (spherical power ≤ 5 D) undergoing uneventful crystalline lens phacoemulsification and insertion of an acrylic intraocular lens. Prediction errors were obtained, with estimations of ± 0.50 D, ± 1.00 D, and greater than ± 2.00 D. A method to improve the corneal height calculation is described. Results: The SRK/T formula (mean absolute error [MAE] = 0.418; median absolute error [MedAE] = 0.352) was the most accurate, followed by the T2 (MAE = 0.435; MedAE = 0.381) and Holladay 1 (MAE = 0.455; MedAE = 0.389) formulas. Both the SRK/T and T2 formulas overestimated corneal height, but values were higher with the T2 formula. Corneal height was more precisely estimated using an alternative method that, when combined with axial length optimization, resulted in lower MAE (0.425) and MedAE (0.365) values than when applying the T2 formula alone. Conclusions: The T2 formula seems to be less accurate than the SRK/T formula in highly myopic eyes. An improved corneal height estimation method is described for the the T2 formula.
A case report of disseminated nocardiosis with ocular involvement in myasthenia gravis patient and literature review
Authors: wang shuhui , Jiang Bin , Li Yao , Shang Yanchang , Liu Zhengshan , Zhang Yongbo 
Published: May 2019

Abstract
Background

Nocardiosis is a rare and life-threatening opportunistic infection in the immunocompromised patients. Myasthenia gravis (MG) patients have the potential risk of nocardia infection because of the use of immunosuppressive agents. To date, only 7 cases of patients with MG have been reported to have nocardiosis. Disseminated nocardiosis with ocular involvement in MG patient haven’t been reported.

Case presentation

A 66-year-old man with MG, receiving treatment of methylprednisolone and azathioprine, was found to have respiratory infection. He also had heterogeneous symptoms with skin, brain and ocular manifestations. Nocardia bacteria was verified by the culture of puncture fluid, and the diagnosis of disseminated nocardiosis was made. Except for the left eye blindness, the patient completely recovered from the disease with combination antibiotic therapy. To further understand nocardiosis in patients with MG, we reviewed previous relevant literatures. According to all the literatures, this is the first report of disseminated nocardiosis with ocular involvement in MG patient.

Conclusions

MG patients with immunosuppressant treatments have the potential risk of rare nocardia infection, and a favourable prognosis can be achieved through early diagnosis and appropriate antibiotic therapy.
Variation of the digester temperature in the annual cycle – using the digester as heat storage
Authors: Hubert C. , Steiniger B. , Schaum C. , Michel M. , Spallek M. 
Published: May 2019

Abstract
Regarding digesters, present guidelines assume that the temperature must be kept constant in order to achieve process stability and that there is a drop in gas production between 40 and 50 °C. Nevertheless, observations of full-scale application show that fluctuations in temperature between mesophilic and thermophilic environments is indeed possible without any loss in biogas production performance. This would be particularly favourable because the digester can thus act as a heat storage. In order to validate temperature fluctuations on full-scale digesters the data of two digesters from different wastewater treatment plants (WWTPs) with high temperature fluctuations were analyzed. In addition, chemical oxygen demand (COD) balances for different temperature ranges were conducted in order to evaluate the process stability. The results show that fluctuations between mesophilic and thermophilic conditions can be achieved without a decrease in biogas production. Increasing the temperature above 50 °C leads to an increase in organic acid concentration as described in the literature. Nevertheless, the total concentration of organic acid was still at an uncritical level below 500 mg/L. The COD balance shows no significant difference between 38 °C, 44 °C and 51 °C. The rate of temperature fluctuations per day specifically seems to be a main factor for process stability rather than temperature itself.
The equilibrium and fixed-bed study of malachite green adsorption on chitosan hydrogels
Authors: Song X. H. , Goh K. L. , Wang K. 
Published: May 2019

Abstract
Chitosan hydrogel beads were prepared by a precipitation process, and were used to investigate the adsorption of malachite green (MG) oxalate under various conditions. It was found that adsorption equilibrium was most sensitive to the pH value at pH &lt;8 while fixed bed breakthrough kinetics presented asymmetric S-shaped profiles which could not be adequately described by conventional models such as Adams-Bohart and Yoon-Nelson. The possible reasons were discussed and an improved Adams-Bohart model was proposed to better describe the changes in mass transfer mechanisms during adsorption.
Pulmonary Arterial Hypertension in Congenital Heart Disease: Controversies and Consensus
Authors: Barst Robyn , Wessel David , Bridges Nancy , Ivy Dunbar 
Published: May 2019

Four physicians discussed current and future strategies for the assessment and treatment of pulmonary arterial hypertension (PAH) related to congenital heart disease.
The roundtable discussion was moderated by Robyn Barst, MD, Professor of Pediatrics, Columbia University College of Physicians and Surgeons, New York, New York, and included David Wessel, MD, Professor of Pediatrics and Anesthesia, Harvard Medical School, and Senior Associate in Cardiology and Anesthesia at Children's Hospital, Boston; Nancy Bridges, MD, Chief of the Clinical Transplantation Section, National Institute for Allergy and Infectious Disease, National Institutes of Health, Bethesda, Maryland; and Dunbar Ivy, MD, Associate Professor of Pediatrics, Chief and Selby Rickenbaugh Chair of Pediatric Cardiology, Director of the Pediatric Pulmonary Hypertension Program, University of Colorado, and Denver Children's Hospital.
Protective Effect of Edaravone on Cyclophosphamide Induced Oxidative Stress and Neurotoxicity in Rats
Authors: Singh Sanjiv , Kumar Abhishek 
Published: May 2019

Background:Cyclophosphamide (CPA) is the most widely prescribed cancer chemotherapeutic agent which shows serious neurotoxic side effect. Generation of reactive oxygen species at the cellular level is the basic mechanism of cyclophosphamide induced neurotoxicity. Edaravone is the synthetic drug used for brain stroke and has potent antioxidant property.Objective:This study aimed to investigate the effect of edaravone on neurobehavioral and neuropathological alteration induced by cyclophosphamide in male rats.Methods:Twenty eight Sprague-Dawley rats were equally divided into four groups of seven rats in each. The control group received saline, and other groups were given CPA intraperitoneally (100 mg/kg), CPA (100 mg/kg) intraperitoneally + Edaravone (10 mg/kg) orally, or Edaravone (10 mg/kg) orally for one month.Results:Our data showed that CPA significantly elevated brain AChE activity in the hippocampal region. A decrease in the total antioxidant capacity and a reduction in the CAT, SOD, and GPX activity occurred in the brains of the rats exposed to CPA. CPA-treated rats showed a significant impairment in long-termmemory and motor coordination. These results were supported by histopathological observations of the brain. Results revealed that administration of edaravone reversed AChE activity alternation and ameliorated behavioral and histopathological changes induced by CPA.Conclusion:This study suggests that co-administration of edaravone with cyclophosphamide may be a useful intriguing therapeutic approach to overcome cyclophosphamide induced neurotoxicity.
THE EFFECT OF SONG IN TEACHING ENGLISH
Authors: Ningsih Nurfajri 
Published: May 2019

This research aims at finding the effectiveness of using song in teaching English at Sulawesi flight college. The researcher applied pre-experimental method, with one group pretest and posttest design which employed speaking test to find out the students’ speaking performance in terms of accuracy. The sample consisted of 40 students used purposive sampling technique taken from the population of the second semester students of Sulawesi Flight. The result of the data analysis indicated that there was significant difference of student’ English achievement before and after being taught by using songs. It is proved by result of statistical analysis of the level significance 0.05 with degree of freedom (df) = N-1 = 46-1 = 39 which indicated that( t- obs = 4.06 > t –table = (1.68 ). It can be said that there is a significant difference of achievement of the students after the treatment.
WHAT HAPPEN TO (CURRICULUM) CRITICAL THEORY? THE NEED TO GO ABOVE AND BEYOND NEOLIBERAL RAGE WITHOUT AVOIDING IT
Authors: PARASKEVA JOÃO M. 
Published: May 2019

Este capítulo examina algumas dificuldades mais óbvias em torno da teoria crítica, que levam à sua incapacidade de se impor como uma nova teoria cultural hegemônica. Investiga também, o papel dos principais educadores críticos na resolução de contradições flagrantes dentro da própria plataforma crítica. Assim sendo, coloco certos quadrantes da plataforma educacional contra hegemônica na rota do "epistemicídio" denunciada por Sousa Santos (2014), inserida no grande terreno da modernidade eurocêntrica ocidental. Argumenta que a construção social, realizada pelas políticas neoliberais, é um cobertor muito curto para cobrir 'os problemas' da teoria crítica e da pedagogia. Defende que as abordagens críticas posteriores, apesar das conquistas significativas mostram insuficiências claras, sendo incapazes de impedir a produção massiva de "Ocidentóticos" e esmagar os "mecanóticos" do currículo. Aponta como a luta entre movimentos educacionais e curriculares dominantes e contradominantes criou uma "involução" (GIL, 2009), um estado de regressão abrindo o caminho para o teoricídio, um legado fatal destinado a perpetuar uma limpeza epistemológica cirúrgica. Conclui defendendo a necessidade de curriculistas e curricólogos para liderarem a luta justa contra o epistemicídio. Para tanto, é decisivo continuar trabalhando em teorias e pedagogias itinerantes da sociedade - ICT - (PARASKEVA, 2016), defendendo diálogos não relativistas entre o norte e o sul globais, no Norte e no Sul (SANTOS, 2014).
ANALISIS KESALAHAN DALAM MENYELESAIKAN SOAL CERITA MATEMATIKA BERDASARKAN NEWMAN
Authors: Fitriatien Sri Rahmawati 
Published: May 2019

Tujuan penelitian ini untuk mendeskripsikan jenis kesalahan serta penyebab siswa kelas VIII-E SMP Dharma Wanita Surabaya dalam menyelesaikan soal cerita materi koordinat kartesius menggunakan prosedur analisis kesalahan Newman. Jenis penelitian ini adalah penelitian kualitatif dengan pengambilan sampel menggunakan purposive sampling. Pada penelitian ini, teknik pengumpulan data menggunakan teknik tes dan wawancara dimana instrumen yang digunakan adalah tes tertulis dengan jumlah 2 soal essay, sedangkan teknik wawancara dilakukan dengan siswa yang terpilih guna memastikan jenis kesalahan yang dilakukan dalam menyelesaikan soal cerita. Peneliti memilih tiga orang siswa untuk dijadikan subjek penelitian dari keseluruhan siswa kelas VIII-E yang melakukan kesalahan terbanyak dalam mengerjakan soal nomor 1 dan soal nomor 2 untuk diwawancarai. Selain itu, ketiga siswa yang terpilih sebagai subjek penelitian ini dipilih berdasarkan kemampuannya berkomunikasi dengan baik. Pada peneitian ini, peneliti mengungkap Dari penelitian ini memberikan informasi bahwa jenis kesalahan yang dilakukan oleh subjek penelitian pertama (S1) mewakili siswa yang melakukan kesalahan pada 5 tahapan, diantarannya adalah tahap membaca (reading error,T1), tahap memahami masalah (comprehension error, T2), tahap trasfomasi masalah (transformation error, T3), tahap keterampilan proses (process skill error, T4), dan tahap penulisan jawaban akhir (encoding error, T5). Kesalahan yang dilakukan subjek penelitian kedua (S2) yang mewakili siswa yang melakukan kesalahan pada 3 tahapan, diantarannya adalah tahap memahami masalah (comprehension error, T2), tahap keterampilan proses (process skill error, T4), dan tahap penulisan jawaban akhir (encoding error, T5). Kesalahan yang dilakukan subjek penelitian ketiga (S3) yang mewakili siswa yang melakukan kesalahan pada 3 tahapan, diantarannya adalah tahap trasfomasi masalah (transformation error, T3), tahap keterampilan proses (process skill error, T4), dan tahap penulisan jawaban akhir (encoding error, T5).Kata kunci: analisis kesalahan siswa, newman, soal cerita matematika
The Effectiveness of Teaching Writing Descriptive Text by Using Social Media “Instagram” to Improve Students’ Writing Ability at Junior High School Students
Authors: Warda Encik Gayiani , Wijaya Armeria 
Published: May 2019

Teaching writing is one skill that is taught by English teacher in school. It became important skill that student have to master writing skill. The researcher chooses Descriptive Text, because it is one of type text to describe something such as place, animal, people and things. The researcher use social media of “Instagram” to teach student in writing descriptive text to improve students writing ability. The researcher use experimental research in quantitative method which two classes as experimental and control group. The sample of the data is taken from Barunawati Junior High School students. The researcher use snowball sampling. The result has been calculated by using SPSS 20.0. The result showed that teaching writing descriptive text using social media“Instagram” to improve students writing ability is effective.
Measurement of Hepatocyte Growth Factor, Interleukin 6 and Tumor necrosis factor α in Acute Myocardial Infarction
Authors: Keshmiri Asadallah , Derakhshan Ali Reza , Fazlinejad Afsoon , Farid-Hosseini Reza 
Published: May 2019

Background: Early mortality rate due to acute myocardial infarction (AMI) is approximately 30%, and half of these deaths occur before reaching a hospital. The prevention and early detection play a key role in reducing mortality in AMI. Hepatocyte Growth Factor (HGF), Interleukin 6 (IL-6), and Tumor Necrosis Factor α (TNF-α) are most recent prognostic biomarkers for AMI. The present study was aimed to evaluate the level of these cytokines in AMI.
Methods: In this case control study, 39 patients with AMI were compared with 30 healthy subjects. Age, sex and other possible confounding factors were matched. AMI diagnosis was confirmed by typical symptoms, electrocardiogram changes and serum concentration of troponin I and creatine kinase-MB. The levels of TNF-α, IL-6 an HGF at baseline and 3 and 7 days later were measured using ELISA method.
Results: Levels of IL-6, TNF-α and HGF increased over time after AMI with ST-segment elevation in study group. The baseline IL-6 levels in AMI group were significantly higher than control group (P<0.05).
Conclusions: The results of this study suggest that baseline levels of IL-6 as well as serial changes of serum IL-6, TNF-α and HGF concentrations can be used as potential diagnostic biomarkers in AMI.