bluuebunny/crossref_metadata_2025_split huggingface dataset:
Knowledge of mathematics teachers in initial training regarding mathematical proofs: Logic-mathematical aspects in the evaluation of arguments
Authors: Alfaro-Carvajal Christian , Flores-Martínez Pablo , Valverde-Soto Gabriela 
Published: January 2022

The objective of this study is to characterize the knowledge of mathematics teachers in initial training (MTITs) at the Universidad Nacional (Costa Rica) on the logic-syntactic and mathematical aspects involved in proving, when evaluating mathematical arguments. The research is positioned in the interpretive paradigm and has a qualitative approach. It consists of two empirical phases: in the first, a questionnaire regarding logic-syntactic aspects was applied to 25 subjects, during the months of September and October 2018 and; in the second phase, a second questionnaire covering mathematical aspects was applied to 19 subjects, during the months of May and June 2019. For the analysis of the information, knowledge indicators were proposed. Knowledge indicators are understood as phrases to determine evidence of knowledge in the responses of the subjects. It was appreciated that the vast majority of future mathematics teachers show knowledge to discriminate when a mathematical argument corresponds or not to a proof by virtue of the logic and syntactic aspects, and of mathematical elements associated with propositions with the structure of universal implication. In general, subjects displayed greater evidence of knowledge on the logic-syntactic aspects than on the mathematical aspects. Specifically, they evidenced that consideration of a particular case or the proof of the reciprocal proposition does not prove the result; likewise, subjects evidenced knowledge about the direct and indirect proof of the universal implication. In the case of the mathematical aspects considered as hypotheses, axioms, definitions and theorems, it was appreciated that subjects could have different levels of difficulties to understand a proof.
Return Home: Photographic Report of a Journey
Authors: FIGLIULO ROBERTO 
Published: January 2022

Desde el principio del nuevo milenio una nueva generación de fotógrafos en China decidió embarcarse en un viaje en dirección contraria, volver desde las grandes metrópolis chinas o desde el extranjero y viajar a sus lugares de origen. Aunque cada uno de ellos desarrolla sus trabajos con un toque personal y representa escenas particulares, todos se centran en la misma dirección de su viaje: volver a casa.
Me refiero a fotógrafos como Zeng Han, Su Jiehao, Mu Ge, Zhu Lanqing, Zhang Wenxin and Zhang Xiao. Fotógrafos con diferentes orígenes y edades, que parece han decidido emprender el mismo camino.
No se quiere sugerir un nuevo patrón, ni introducir una nueva tendencia en la fotografía contemporánea china. Sino quiero mostrar como estos trabajos fotográficos comparten intenciones y sentimientos comunes en un periodo de irrefutable cambio.
Serum ferritin: A hidden gem for diagnosing plummer vinson syndrome
Authors: Karthikeyan P , Rasmika K 
Published: January 2022

Plummer-Vinson syndrome (PVS) is a triad of dysphagia, iron deficiency anemia and upper esophageal web. Early diagnosis with adequate treatment is necessary to prevent its malignant transformation. To represent different clinical pictures of PVS and to evaluate the treatment outcome and determine its prevalence. This is a descriptive study with study population of 267 patients with dysphagia and 40 had PVS. Post cricoid webs were dilated and post-operative iron correction was done. Patients are on regular follow up. Analysis showed highest incidence in females with dysphagia being the main presenting complaint in all the patients. All had iron deficiency and 90% of patients had post cricoid web. PVS is a precancerous condition. Serum ferritin should be the preferred parameter for diagnosing iron deficiency anemia. Regular follow up is warranted to prevent malignant progression.
Speech and swallowing difficulties and rehabilitation in osmotic demyelination syndrome: A single case report
Authors: Monish V , Sreedevi N 
Published: January 2022

: Aim of the work was to highlight the speech and swallowing difficulties that are associated with osmotic demyelination syndrome and also the importance of speech and language therapy in patients with osmotic demyelination syndrome. In this case report, a 68 years old female who developed osmotic demyelination syndrome as a result of hyponatremia correction has been described. The patient developed motor, speech and swallowing difficulties after 10 day of hyponatremia correction. For assessing speech and language skills, Bedside Screening Test for Persons with Aphasia was used. Gugging Swallowing Screen was used for assessing the swallowing skills.: The assessment results indicated that the patient’s auditory comprehension skills were preserved and other verbal skills were affected as the patient had mutism. Also the patient had slight dysphagia with lower risk of aspiration. With speech-language intervention, improvement was observed in swallowing and verbal communication skills. ODS is a rare clinical condition. In order to have a better perspective about speech, language and swallowing skills in individuals with ODS, replication of such studies are essential.
PERAN PEMBINA PENGEMBANGAN DIRI MELALUI ROHANI ISLAM (ROHIS) DALAM MENINGKATKAN SIKAP KEBERAGAMAAN SISWA DI SMK SALATIGA
Authors: Rodhiyatun Mushbihah 
Published: January 2022

Pengembangan diri dalam bentuk ekstrakurikuler mengandung arti didalamnya terjadi verifikasi program berbasis bakat dan minat yang memerlukan pelayanan pembinaan khusus sesuai dengan keahliannya. Penelitian ini bertujuan untuk mengetahui upaya yang dilakukan pembina pengembangan diri melalui Rohani Islam (ROHIS) dalam meningkatkan sikap keberagamaan siswa di SMK Salatiga yang diwakili oleh SMK Negeri 01, SMK Negeri 02, SMK Pelita dan SMK Islam Sudirman Salatiga. Jenis penelitian ini adalah kualitatif dengan pendekatan sosiologis. Sumber data yang diperoleh yaitu sumber data primer dan sekunder. Pengumpulan data melalui teknik observasi, interview, dan dokumentasi. Teknik analisis datanya dengan cara mereduksi data, display data dan mengambil kesimpulan. Permasalahan yang dibahas meliputi berbagai bentuk pengembangan diri melalui ROHIS, dinamika aktivitas dan peran pembina serta hubungan sosiologis pengaruh pembina pengembangan diri melalui ROHIS terhadap peningkatan sikap keberagamaan siswa. Hasil penelitian menunjukkan bahwa pembina pengembangan diri melalui ROHIS mempunyai peranan yang sangat besar dalam peningkatan sikap keberagamaan siswa di SMK Salatiga yaitu sebagai motivator, creator dan inovator, integrator, serta sublimator.
Numeryczne symulacje procesu magazynowania wodoru w częściowo wyeksploatowanym złożu gazowym
Authors:   Instytut Nafty i Gazu – Państwowy Instytut Badawczy, Szott Wiesław , Miłek Krzysztof ,   Instytut Nafty i Gazu – Państwowy Instytut Badawczy
Published: January 2022

"W pracy przedstawiono charakterystyki potencjalnych struktur możliwych do wykorzystania w celu magazynowania wodoru. Sformułowano kryteria wyboru optymalnej struktury, takie jak: pojemność dostępna dla wodoru, zakres historycznych ciśnień złożowych, ciśnienie szczelinowania, własności transportowe skały, aktywność wody podścielającej, rodzaj płynu złożowego, temperatura złożowa. Stosując te kryteria, wybrano strukturę złoża gazu ziemnego funkcjonującą obecnie jako PMG (podziemny magazyn gazu). Dla znalezienia charakterystyk wybranej struktury jako PMW (podziemnego magazynu wodoru) skonstruowano kompozycyjny model złożowy poprzez konwersję istniejącego modelu typu black oil. W tym celu model złoża uzupełniono o wieloskładnikowy model płynu złożowego opisany równaniem stanu Soave’a–Redlicha–Kwonga oraz o kompozycyjne hydrauliczne modele odwiertów. Kompletny model złoża efektywnie skalibrowano, wykorzystując wieloletnie historyczne dane eksploatacyjne obejmujące wydajności wydobycia ze złoża, zatłaczania i odbioru gazu w ramach PMG oraz ciśnienie zmierzone na spodzie odwiertów eksploatacyjnych. Zweryfikowany model wykorzystano do wielokrotnych symulacji procesu magazynowania wodoru, stosując realistyczne ograniczenia dla zatłaczania i odbioru gazu, tj. czas zatłaczania i odbioru, limity na sumaryczną ilość zatłaczanego wodoru oraz odbieranego gazu, minimalną czystość odbieranego wodoru. Rozpatrzono warianty różniące się szczegółami konwersji PMG na PMW oraz zakładanym maksymalnym stopniem zanieczyszczenia odbieranego wodoru. Podstawowe własności geologiczne wynikały z oryginalnych właściwości struktury i nie podlegały modyfikacjom, natomiast nieznany, ale istotny parametr dyspersji, decydujący o mieszaniu się gazu zatłaczanego z gazem rodzimym, był przedmiotem analizy wariantowej. Wyniki ilościowe prognoz pracy PMW uzupełniono szczegółową analizą rozkładów nasycenia wodorem na różnych etapach i w różnych cyklach pracy magazynu. W pracy badano wpływ zjawiska dyspersji na wyniki pracy magazynu poprzez implementację zjawiska dyspersji numerycznej, weryfikację poprawności korelacji dyspersji z prędkością migracji oraz identyfikację wielkości dyspersji dla różnych wariantów modelu złoża."
The Character of Adolescents In The North Aceh Coastal Area: An Impact of Authoritarian Parenting Style
Authors: Ma'awiyah Aisyah 
Published: January 2022

<span>Parenting style is an activity of guiding, educating, and raising children. There are three types of parenting styles, i.e., authoritarian, authoritative, and permissive. This study investigates the effects of authoritarian parenting on adolescents' character in the coastal community at North Aceh. It is a qualitative study in which the participants were fifteen fishermen who have adolescent children between 12-18 years old. The data were obtained through interviews and observations, which were subsequently analyzed qualitatively. The results showed three negative effects of authoritarian parenting on adolescents' character, i.e., disobedience, impudence, indiscipline, and irresponsibility. Negligence of these adverse effects may lead to criminal acts in adolescents and affect their future mental development. </span>
JURNAL SISTEM INFORMASI MANAJEMEN PEMBERKASAN PERKARA PIDANA UMUM PADA KEJAKSAAN NEGERI KABUPATEN MADIUN
Authors: Maria Ulfa Indrasari  , Wiji Setiyaningsih  
Published: January 2022

Sistem Informasi Manajemen (SIM) Pemberkasan Perkara Pidana Umum dalam upaya kemudahkan akses berkas penyidik dan surat perintah bidang pidum, terdapat permasalahan pengiriman berkas penyidik menggunakan kurir yang kurang efisien karena jarak tempuh yang cukup jauh, penumpukan berkas tidak tertata, Kasi Pidum masih menggunakan buku agenda untuk merekap penanganan perkara JPU, penomoran surat perintah menggunakan buku besar pada bidang pidum, setiap surat membutuhkan tandatangan kepala kejaksaan negeri (kajari). Penelitian ini bertujuan memudahkan penyidik area Kabupaten Madiun dan pegawai pada Kejaksaan Negeri Kabupaten Madiun dalam manajemen penanganan perkara untuk mengelola berkas perkara data tersangka. Metode pengembangan sistem menggunakan waterfall. Perancangan penelitian ini menghasilkan sebuah aplikasi SIM pemberkasan perkara Bidang Tindak Pidana Umum di Kejaksaan Negeri Kabupaten Madiun untuk mengelola berkas perkara data tersangka yang ada di Kejaksaan Negeri Kabupaten Madiun. Hasil prosentase UAT pada penelitian ini adalah 75.6% menyatakan user menerima aplikasi SIM pemberkasan perkara yang dibuat dan dapat diterima dengan baik. Sistem yang dibuat dapat memudahkan pengiriman berkas bagi penyidik dengan adanya upload file, kasi pidum dapat memonitoring perkara, memudahkan jaksa dan staf dalam pembuatan surat perintah mengurangi redudansi data sehingga pelaporan lebih optimal, dan kajari dapat melihat rekapitulasi surat masuk dan keluar bidang pidum
UPAYA MENINGKATKAN KEMAMPUAN KERJASAMA DAN BERPIKIR KRITIS SISWA SMP MELALUI MODEL COLLABORATIVE PROBLEM SOLVING
Authors: Elviani ovesarti Maria 
Published: January 2022

Penelitian ini bertujuan untuk: (1) keterlaksanan model collaborative problem solving untuk tingkatkan kemampuan kerjasama dan berpikir kritis siswa SMP Nasional Malang, (2) model peningkatan kemampuan kerjasama siswa kelas VIII SMP Nasional Malang melalui model collaborative problem solving, (3) model peningkatan kemampuan berpikir kritis siswa kelas VIII D SMP Nasional Malang melalui model collaborative problem solving. Penelitian ini ialah penelitian tindakan kelas (classroom action research) dengan menggunakan pendekatan kualitatif. Penelitian tindakan kelas yang terdiri dari empat tahap, yakni perencanan, perlakuan, penglihatan, dan refleksi. Penghasilan dari penelitian merupakan : (1) dari hasil tes siklus I diperoleh bahwa nilai rata-rata kemampuan kerjasama sebesar 72,50%. Dan memenuhi kriteria tinggi. Jika melihat dari hasil ketuntasan belajar siswa yang sudah meemenuhi KKM ( 75). Pada tindakan I, 9 siswa atau 37,5% dari 24 siswa, (2) dari hasil angket siklus II diperoleh bahwa nilai rata-rata kemampuan kerjasama siswa sebesar 81,67%. Dan memenuhi kriteria sangat tinggi. Jika dilihat dari ketuntasan belajar siswa yang memenuhi belajar siswa yang memenuhi KKM ( 75). Pada siklus II sebanyak 20 siswa yang memenuhi kriteria ketuntasan minimal (KKM) atau 83,33% dari 24 siswa. (3) kemampuan berpikir kritis yang mencapai siswa pada siklus II 77,10%, yaitu memenuhi kriteria baik, ini berarti untuk prestasi berpikir tingkat tinggi sangat kritis peserta didik sudah meningkat. Dapat menyimpulkan untuk belajar menggunakan model collaborative problem solving yang dilaksanakan di SMP Nasional Malang memenuhi kriteria baik sekali, hal itu dapat dibuktikan dengan melihat hasil presentasi pembelajaran pada siklus I dan siklus II.
RANCANG BANGUN SISTEM INFORMASI PENJUALAN LAPTOP BERBASIS WEB DENGAN METODE WATERFALL
Authors: Manis Ritalia , Setiyaningsih Wiji , Kuswinardi Wiwin 
Published: January 2022

Sistem penjualan di toko Flobamora Computer masih menerapkan sistem penjualan langsung, dimana sistem penjualan, promosi dan informasi produk akan di dapatkan konsumen hanya pada saat mendatangi toko secara langsung. Jangkauan promosi toko flobamora computer sangat terbatas dikarenakan promosinya masih menggunakan iklan cetak dan brosur. Aktifitas Administratif penjualan dan pencatatan stock barang pada Toko Flobamora masih dengan cara mencatat pada sebuah buku besar. Dampak dari permasalahan tersebut adalah banyaknya terjadi kehilangan data stok, data penjualan sehingga untuk membuat laporan penjualan harus melakukan pencatatan ulang untuk mengembalikan data stok dan data penjualan. Berdasarkan permasalahan di atas, penulis berinisiatif membuat sebuah rancangan sistem penjualan dengan tujuan untuk mengefektifkan administratif penjualan hingga pembuatan laporan bulanan pada toko flobamora Computer serta untuk meningkatkan promosi produk dari toko flobamora ke jangkauan yang lebih luas. Dengan adanya sistem informasi penjualan ini diharapkan dapat membantu memecahkan masalah administratif penjualan pada toko flobamora dalam hal pencatatan stock, data penjualan dan pembuatan laporan penjualan dan memmbantu pemasaran dan promosi toko flobamora computer ke jangkauan yang lebih luas yakni dengan pemasaran dan promosi secara online.Kata kunci : Penjualan online, Administratif Penjualan, Pencatatan Stock
Processes of Screenout Development and Avoidance
Authors: Barree Robert 
Published: January 2022

Abstract
In SPE 18955, published in 1989, a strong case was made suggesting that observed rapid increases in treating pressure were not caused by fracture "tip screenouts". These conclusions were further supported by extensive laboratory studies of proppant bridging in slot-flow geometries. These studies showed that conventional "bridging criteria" predicting slot widths of 3-6 particle diameters would cause permanent proppant bridging or packing, were invalid. These results were published in SPE 67298 in 2001. Yet, more than 30 years after the first cited publication the terms "tip screenout" and "tip screenout design" are still in common usage. This paper presents a physics-based description of the mechanisms that cause actual wellbore screenout and the associated rapid pressure rise, and easy to apply methods to prevent or avoid developing screenouts while pumping.
Field cases and numerical simulation studies will be presented to show that screenouts occur in the very near-wellbore region, particularly at the borehole sand-face. The proximity to the wellbore allows changes to be made to pump rate and other parameters, without the need to adjust fluid composition, stability, or prepad/pad volumes in future stages. A numerical simulator has been used to simulate observed screenout conditions, predict their occurrence, and demonstrate that screenout progression can be halted or controlled. The paper presents the underlying physical processes that control screenouts and explains why the proposed (and field tested) avoidance protocols work.
The numerical formulation presented in the paper models screenout development and shows how to avert progression of the associated treating pressure rise. The method has been tested and verified in the field, and examples are provided. The work shows conclusively that screenouts occur at the wellbore surface or entry to the fracture intersections with the borehole, and not in the body or tip (perimeter) of the propagating fracture.
The information presented in the paper invalidates decades of conventional fracture design theory including pad volume requirements based on fluid efficiency, design of fracturing fluid rheological stability at bottomhole temperature for the duration of pumping time, methods for proppant concentration scheduling (ramping), and virtually all conventional "design" practices.
Empirical Meets Analytical-Novel Case Study Quantifies Fracture Stress Shadowing and Net Pressure Using Bottom Hole Pressure and Optical Fiber
Authors: Haustveit Kyle , Elliott Brendan , Roberts Jon 
Published: January 2022

Abstract
The Anadarko Basin is located within a strike-slip faulting regime (SHMax&gt;Sv&gt;Shmin) which results in large, planar fracture geometries created during the hydraulic stimulation of low permeability formations. The Meramec formation is dominated by siltstones as part of a series of prograding, stacked clinoforms. The geomechanical properties and the regional stress regime are first order drivers in controlling fracture growth rates, size, and ultimately the drainage area. Net pressure and stress shadowing play a significant role in the design of cluster spacing, proppant selection, fluid selection, and resulting fracture geometry. This paper will review an operator’s case study designed to quantify stress shadowing and fracture net pressure using multiple bottomhole pressure gauges (BHPGs) in a horizontal, multi-stage stimulation in the Meramec formation of the Anadarko Basin.
The case study will review the measurements taken from two permanently installed BHPGs placed along a horizontal wellbore during a hydraulic stimulation. The first BHPG is located at the toe of a horizontal wellbore being stimulated and is in communication with hydraulic fractures created during the first stage; the second BHPG is located near the heel of the same well being stimulated. The BHPG at the toe of the well is used to measure the poroelastic pressure responses generated as stages are completed uphole from the first stage. Optical fiber is analyzed to evaluate Near Wellbore (NWB) and far-field fracture interactions. The measurements have been integrated into a fracture simulator to calibrate the far-field stress during hydraulic fracture growth.
Measured stress shadowing in this pilot allowed the authors to develop an equation that can be solved to estimate net pressure. The results are aligned with measurements obtained from DFITs in the area. Historically, net pressure and stress shadow values have been difficult to measure with high confidence due to various pressure losses between the wellhead and formation. Net pressure is a key for optimal cluster spacing design, and a critical matching parameter for hydraulic stimulation models, small errors in net pressure matches can have significant impacts in the resulting simulated fracture geometry. This paper will detail the integration of empirical data to advance an analytical model that quantifies net pressure and poroelastic stress transfer from a hydraulic fracture.
Perforation Cluster Efficiency of Cemented Plug and Perf Limited Entry Completions. Insights from Logging Based Diagnostics
Authors: Witt Darby , Barhaug Jessica , Propper Maarten , Jiang Wei , Jeff Jia Jeff , Hawkes Robert 
Published: January 2022

Abstract
It is now well established that production from horizontal wells with multi-stage hydraulic fracture stimulations performed through plug and perf completions is highly variable along the length of the wellbore. In addition to the elements of the completion design, such as fluid and proppant volume, injection rate, stage length, and the number and spacing of perforation clusters, subsurface conditions influence the performance of individual stimulated perforation clusters, intervals, and wells. Information about completion efficiency can be obtained using conventional well log measurements for fracture fluid mapping. Contemporary logging conveyance methods make this information gathering practical for modern horizontal wellbores. A log-based Perforation Cluster Efficiency (PCE) computational method will be presented.
These conventional open-hole logging measurements reveal insights into the Near-Wellbore Region (NWR), including annular cement density, and can be used to anticipate fracture behavior. Integrating well log measurements with Fiber Optic (FO) diagnostics provides insight into the performance of each perforation cluster and the factors controlling frac construction. This paper illustrates recent observations about PCE using traditional well log measurements with new conveyance methods and summarizes the results for several cemented plug and perforated completed Niobrara and Codell wells within the DJ basin. A comparison to interpreted FO DAS data is included, illustrating a good agreement for PCE.