bluuebunny/crossref_metadata_2025 huggingface dataset:
Pengaruh Petugas Tidak Resmi terhadap Kinerja Simpang Tak Bersinyal pada Persimpangan Jalan Wahid Hasyim - Jalan Selokan Mataram, Yogyakarta
Authors: Romadhona Prima J. , Hakiki Moh. Zuhdi Ridwan
Published: May 2022

The traffic jam that occurred on Selokan Mataram Street specifically at the intersection of Selokan Mataran Street - Wahid Hasyim Street gave rise unofficial officers or commonly referred to as "Pak Ogah" who took over the police to regulate the traffic. Therefore this research aims to study how the influence of unofficial officers on the performance of the intersection at the Selokan Mataram Street - Wahid Hasyim Street (OB Intersection). The survey was conducted for 2 days which included vehicle volume surveys, vehicle speed surveys, queue length surveys and driving behavior surveys. The results of the VISSIM modeling analysis showed that one-way system management was more effective than unofficial officer with an average delay value of 75.58%. Meanwhile, the length of the queue has decreased and increased. Decrease in the value of the queue length occurred in the north and south by 43.54% and 37.22% and an increase in the west by 31.17%. However, the value of this increase was not as much as the condition of unofficial officers at 78.90% of the existing conditions.
EFEKTIVITAS PENGGELONTORAN SEDIMEN (FLUSHING) STUDI KASUS WADUK PB SOEDIRMAN
Authors: Cantik Bella Koes Paulina , Legono Djoko , Rahardjo Adam Pamudji
Published: May 2022

Sedimentasi waduk menjadi salah satu masalah kompleks yang harus ditangani secara tepat. Banyak upaya pemeliharaan waduk yang dilakukan agar umur teknis waduk dapat bertahan sesuai perencanaan, salah satu diantaranya adalah pengeluaran sedimen dari dalam waduk dengan cara flushing. Flushing atau penggelontoran sedimen dalam jumlah yang masif menjadi salah satu solusi yang ditawarkan untuk mengurangi sedimen yang terlanjur mengendap guna mencapai efektivitas dan efisiensi pembuangan sedimen dari dalam waduk. Waduk Mrica merupakan salah satu waduk di Indonesia yang rutin melakukan flushing sebagai upaya pemeliharaan. Flushing Waduk Mrica melalui drawdown culvert (DDC) sudah dilakukan sejak tahun 1992 namun volume aktif waduk semakin menurun setiap tahunnya. Tujuan dari penelitian ini untuk mengevaluasi kinerja flushing dengan menghitung nilai flushing feasibility dengan mendasarkan pada praktik atau pelaksanaan flushing Waduk Mrica selama ini serta berdasarkan kriteria dan rumus pendekatan. Hasil analisis menunjukkan bahwa nilai efektivitas tertinggi adalah pada tahun 2014 dengan nilai 0,059 untuk Metode Morris & Fan dan Metode Qian, dan 0,067 untuk Metode Lai & Shen. Sedangkan untuk Metode Ackers & Thompson menghasilkan nilai 0,858. Hasil perhitungan feasibility study menunjukkan bahwa flushing yang dilakukan Waduk Mrica pada tahun tertinjau belum dapat dikategorikan layak dikarenakan kriteria Sediment Balance Ratio with Full Drawdown tidak terpenuhi. Penelusuran waduk menunjukkan bahwa adanya konsistensi nilai head loss coefficient dengan range nilai 3,98 sampai dengan 4,14 pada penggelontoran sedimen di Waduk Mrica. Sehingga dapat disimpulkan bahwa flushing dapat mencapai feasible dan efektif bila dilakukan pada saat inflow mulai naik, durasi melebihi 13 jam, dan debit flushing mencapai 280 m3/s.
DAMPAK PERUBAHAN TATA GUNA LAHAN TERHADAP DEBIT PUNCAK DI SUB DAS TALANG KABUPATEN JEMBER
Authors: Putri Dyah Ayu Intanasya , Widiarti Wiwik Yunarni , Halik Gusfan
Published: May 2022

Sub DAS Talang merupakan bagian dari DAS Mayang yang merupakan salah satu daerah aliran sungai yang berada di Kabupaten Jember. Meningkatnya kebutuhan manusia terhadap tempat tinggal menyebabkan perubahan tata guna lahan dari daerah resapan menjadi pemukiman. Sehingga air hujan tidak dapat meresap ke dalam tanah dan menjadi aliran  permukaan dan menyebabkan debit yang dihasilkan meningkat. Maka dari itu dilakukan  klasifikasi citra landsat 7 & 8 menggunakan program ERR Mapper & ArcGIS untuk mengetahui perubahan tata guna lahan dan program HEC-HMS untuk mengetahui perubahan debit puncak yang terjadi. Penelitian ini menggunakan metode SCS Unit Hydrograph dengan tata guna lahan tahun 2009, 2013, dan 2018 sedangkan data curah hujan harian dan debit harian tahun 2018. Pada tata guna lahan tahun 2009 sampai 2018 luas lahan hutan terus mengalami penurunan sebesar 7,49 %. Hasil dari analisa berupa grafik yang menunjukkan debit puncak terus meningkat dari tahun 2009, 2013, hingga tahun 2018. Debit puncak mengalami peningkatan sebesar 67,48 % dikarenakan nilai CN yang meningkat seiring penurunan luasan hutan sehingga debit yang dihasilkan juga menjadi lebih besar.
KAJIAN PENERAPAN SISTEM KESELAMATAN DAN KESEHATAN KERJA (SMK3) PADA PERUSAHAAN-PERUSAHAAN DI PROVINSI PAPUA
Authors: Renyaan Lambertus Marianto , Koesmargono Ambrosius
Published: May 2022

Penelitian ini bertujuan untuk mengetahui penerapan SMK3 pada beberapa daerah dan perusahaan-perusahaan di Provinsi Papua serta kendala apa saja yang terjadi dalam penerapan SMK3 itu sendiri. Penelitian ini menggunakan penelitian kuantitatif dengan dengan menggunakan kuesioner untuk melihat penerapan Sistem Manajemen Keselamatan dan Kesehatan Kerja (SMK3) pada perusahaan-perusahaan di Provinsi Papua dengan bantuan program komputer Microsoft Exel dalam pengolahan data. Hasil pegolahan data diketahui bahwa penerapan pada beberapa kabupaten di provinsi Papua seperti Kota Jayapura 71% dan Kabupaten Nabire 69% tingkat penilaian penerapan SMK3 baik. Sedangkan untuk Kabupaten Mimika 91% dan Kabupaten Merauke 86% termasuk kategori tingkat penilaian penerapan Memuaskan. Demikian halnya pada beberapa perusahaan di provinsi Papua, penerapan SMK3 termasuk kategori tingkat penilaian penerapan baik. Pada perseroan terbatas (PT) adalah 71% dan persekutuan komanditer (CV) adalah 79%. Namun masih terdapat beberapa kendala dalam penerapan SMK3 di provinsi Papua di antaranya adalah masih banyak pekerja yang mengganggap bahwa K3 kurang penting dan kurangnya personil/petugas/ahli K3 dalam perusahaan-perusahaan di provinsi Papua.
ANALISIS PENGARUH KECEPATAN DAN VOLUME KENDARAAN TERHADAP EMISI DAN KONSENTRASI KARBON MONOKSIDA DI JALAN JENDERAL SUDIRMAN, KOTA PEKANBARU
Authors: Sasmita Aryo , Reza Muhammad , Elystia Shinta , Syarah Adriana
Published: May 2022

Jumlah penduduk yang semakin meningkat mempengaruhi mobilitas masyarakat yang berdampak pada meningkatnya volume kendaraan dan kemacetan. Kemacetan akan bisa menyebabkan menurunnya kualitas udara diperkotaan, terutama gas CO yang berasal dari gas buang kendaraan. Penelitian ini dilakukan di Jalan Jenderal Sudirman yang memiliki kepadatan kendaraan tertinggi di Kota Pekanbaru. Tujuan penelitian ini adalah menganalisis emisi dan konsentrasi CO yang dipengaruhi kecepatan dan volume kendaraan  yang berbeda. Metode yang digunakan yaitu menghitung kecepatan dan volume kendaraan, mengukur konsentrasi CO di lapangan, menghitung emisi CO, dan menganalisis besarnya pengaruh kecepatan dan volume kendaraan terhadap konsentrasi dan emisi CO. Pengambilan data dilakukan pada dua titik di jalan Jendral Sudirman Kota Pekanbaru yang dibedakan berdasarkan kecepatan rata-ratanya. Data yang diperoleh diuji menggunakan analisis linier berganda menggunakan software SPSS. Hasil dari penelitian memperlihatkan adanya hubungan yang selaras antara jumlah kendaraan, kecepatan kendaraan, dan emisi CO, dimana semakin banyak jumlah kendaraan pada suatu titik maka kecepatan kendaraan akan semakin rendah sehingga emisi CO yang dihasilkan lebih besar. Sebaliknya untuk konsentrasi CO, jumlah dan kecepatan kendaraan tidak selalu berpengaruh terhadap konsentrasi CO.  Hal ini dikarenakan konsentrasi CO terdispersi di udara yang disebabkan oleh faktor lain seperti kecepatan angin dan suhu.
PEMODELAN PENURUNAN KAPASITAS KOLOM GEDUNG AKIBAT KOROSI SERAGAM (UNIFORM CORROSION) PADA TULANGAN BAJA
Authors: Astuti Pinta
Published: May 2022

Korosi adalah salah satu kerusakan yang terjadi pada struktur beton bertulang. Reaksi pada korosi terjadi akibat perubahan atom Fe dalam tulangan menjadi ion Fe2+ atau Fe3+. Mekanisme korosi disebabkan oleh ion klorida dan karbonasi. Korosi yang digunakan di pengujian ini menggunakan korosi seragam yang disimulasikan dengan pengurangan penampang dari tulangan untuk menggambarkan tingkat korosi struktur kolom yang mengalami korosi akan mempengaruhi hasil diagram interaksi kolom. Kerusakan korosi akan menyebabkan kinerja bangunan beton menurun, dan jika kerusakan berlanjut, makan bangunan beton sudah tidak layak pakai. Cara mengatasi korosi dengan inhibitor korosi yaitu menambahkan elemen kimia ke lingkungan baja untuk mengurangi laju korosi. Pengujian ini menggunakan 6 jenis kolom 2 studi kasus, dan 4 penambahan beban. Desain struktur beton menggunakan program bantuan seperti SAP2000 untuk menganalisis gaya yang membebani struktur kemudian diintegrasikan dengan program SPColumn untuk mengetahui tulangan yang mengalami korosi mampu menahan beban dari struktur bangunan. Dari hasil analsis SPColumn didapatkan kolom C1, C2, dan C3 mampu menahan beban struktur hingga tingkat korosi 20%, sedangkan C4-1, C4-2, dan C5 mampu sampai tingkat korosi 45%. Nilai kuat lentur nominal dan kapasitas momen mengalami penurunan hingga 36% pada kolom C4-2 dengan pembebanan 0% dan tingkat korosi sampai 45%. Nilai regangan tarik baja meningkat hingga 21% pada kolom C4-2 dengan pembebanan 0% dan tingkat korosi sampai 45%. Hasil diagram interaksi dari kedua studi kasus, semua kolom mampu menahan hingga 50% tingkat korosi.
Моделі підприємства: сучасний ракурс
Authors: Агій Ярослав Юрійович , Данайканич О.В. , Кубіній В.В.
Published: May 2022

Підвищення ефективності діяльності підприємства значною мірою визначається теоретичним концептом, відображеним в певній моделі. Метою даного дослідження є окреслення моделей підприємства в залежності від теоретичного концепту бізнесу, його створення та ефективного функціонування. В процесі дослідження були застосовані методи наукової абстракції, систематизації, структуризації та інші. В сучасному калейдоскопі теоретичних підходів традиційно виділяють чотири моделі підприємства: економічна, інституціональна, підприємницька та системна. Запропоновано розширити лінійку підходів та виділити організаційну й інформаційну моделі
Фінансова звітність у системі інформайного забезпечення прийняття стратегічних рішень: проблеми і перспективи розвитку в Україні
Authors: Даньків Й.Я. , Шеверя Я.В. , Ганусич В.О.
Published: May 2022

На сучасному етапі розвитку ринкових відносин ефективне стратегічне управління є основою сталого розвитку діяльності підприємства у довгостроковій перспективі. Для зовнішніх користувачів фінансової звітності прийняття стратегічних рішень також є запорукою ефективності та гарантування рентабельності здійснення інвестицій чи налагодження співпраці між суб’єктами господарювання. Тому дослідження, спрямовані на розробку і удосконалення бухгалтерського обліку, економічного аналізу та фінансової звітності, як інформаційних джерел для розрахунку комплексних аналітичних і стратегічних показників на сьогодні є дуже актуальними і дозволяють підприємству та зацікавленим користувачам вірно обирати і реалізувати на практиці ефективну стратегію господарювання і прийняття рішень. Це у свою чергу ставить нові вимоги до організації і методики визначення та розкриття переліку ключових показників на основі бухгалтерської звітності, економічного аналізу і прогнозованої інформації. Агреговані та аналітичні ключові показники визначають якість прийняття стратегічних управлінських рішень у поєднанні з достовірною інформацією ретроспективного характеру як для підприємства так і для зовнішніх користувачів фінансової звітності.
ПОТЕНЦІАЛ РОЗВИТКУ СІЛЬСЬКИХ ТЕРИТОРІЙ В УМОВАХ ДЕЦЕНТРАЛІЗАЦІЇ
Authors: Петрецький І.І.
Published: May 2022

статті обґрунтовано необхідність інтенсифікації розвитку сільських територій в Україні. Визначеноосновні проблеми функціонування сільських територій, які потребують першочергового вирішення.Визначено роль та місце реформи децентралізації влади у розвитку сільських територій. Виявленоуправлінський, соціально-економічний, ресурсно-виробничий та інноваційно-інвестиційний потенціалрозвитку сільських територій, що відкривається у ході децентралізації. Підкреслено значення інноваційно-ресурсного потенціалу в розвитку сільських територій та визначено засади здійснення інноваційно-інвестиційної активності. Запропоновано напрями активізації інноваційно-інвестиційного розвиткусільських територій, першочерговим з яких є формування політики інноваційного, підвищення інвестиційноїпривабливості та формування відповідного інфраструктурного забезпечення
АНАЛІЗ ЕФЕКТИВНОСТІ ДІЯЛЬНОСТІ СІЛЬСЬКОГОСПОДАРСЬКИХ ПІДПРИЄМСТВ ЛЬВІВСЬКОЇ ОБЛАСТІ В УМОВАХ ЕКОНОМІЧНОЇ ТРАНСФОРМАЦІЇ
Authors: Колач С.М.
Published: May 2022

Проблема. У статті розглянуто питання аграрнихперетворень, пов'язаних із відносинами власностіна селі та розвитком на цій основі новихагроформування. Зокрема, формування у сільськійтериторії сільськогосподарських підприємств заснованихна приватній власності на землю та коштивиробництва, де відчутна роль господаря, здатногофункціонувати в умовах ринку із позитивнимирезультатами, стимулює працівників допідприємницької діяльності в аграрній сфері, а вперспективі – це причина позитивних зрушень населі, зокрема формування конкуренції міжсільськогосподарськими товаровиробниками,що сприяє зростанню ефективності виробництва.Основні результати дослідження. Головне місце уформуванні ефективності виробництва займаютьвиробничі ресурси. Засоби праці та предметипраці (засоби виробництва) беруть участь у створеннівартості продукції та визначають рівень розвиткуматеріало-технічної бази сільськогосподарськогопідприємства, а також обслуговують процес виробництва,формують виробничі фонди сільськогосподарських підприємств та надаютьбезпосередній вплив на ефективність виробництва.Економічний стан сільськогосподарських підприємствхарактеризує власний капітал. Чим більший власнийкапітал, тим фінансово стійкіше підприємство.Сільськогосподарські підприємства, будучи суб'єктомінвестиційної діяльності, що самостійно визначаютьнапрямки, види та обсяги інвестицій та приймаютьрішення про вкладення власних чи залученихфінансових або майнових ресурсів в об'єктифінансування.Висновки та конкретні пропозиції автора. Інтересивиробників сільськогосподарської продукції та їїспоживачів збігаються тільки за ціни рівноваги, тоє коли попит на продукцію відповідаєпропозицією, або, інакше кажучи, попит урівноваженийпропозицією. Розподіл ресурсів, згідно з якимстан суб'єктів ринку покращується, називаютьефективним. Але, зокрема, у сільському господарствівиникають ситуації, коли ринковий механізм незабезпечує ефективного використання наявнихресурсів. Наявність перелічених вад ринковогосаморегулювання зумовлює необхідністьдержавного втручання у процес виробництва. Вцілях захисту конкуренції держава здійснюєантимонопольну політику, що реалізується на підставіантимонопольного законодавства
АНАЛІЗ ТА НАПРЯМИ ВДОСКОНАЛЕННЯ ФІРМОВОГО СТИЛЮ РЕСТОРАНУ «НАША ДАЧА»
Authors: Вольпрет М.В. , Шмадченко П.В. , Жихор О.Б.
Published: May 2022

Статтю присвячено аналізу теоретичних основ та формуванню фірмового стилю ресторану «НашаДача». Висвітлено теоретичні основи та визначено поняття «фірмовий стиль», його функції таскладові, основні етапи розробки фірмового стилю. Проаналізовано сучасний стан фірмового стилюресторану. В результаті аналізу було визначено головних конкурентів ресторану «Наша Дача»,проаналізовано усі складові фірмового стилю ресторану «Наша Дача» , виділено основні проблемифірмового стилю, проаналізовано зміну середнього рахунку за період 2018-2021 рокі. Наданорекомендації щодо поліпшення роботи ресторану та його фірмового стилю.
Patient-appropriate and patient-specific quantification: Application of biomedical sciences and engineering principles for the amelioration of outcomes following reconstruction of osteochondrotomy of the sternum to access the mediastinum
Authors: Gandhi Harjeet Singh
Published: May 2022

It is a fact that the morphology, physiology, and load-bearing activities of two patients are never identical. The normal allometric variations in regional anatomy, primary disease processes, and co-morbid pathologies demand individual treatment planning and selection of implants for surgical repair, reconstruction, and replacement leading to patient-specific and patient-appropriate interventions. It requires quantification of hard and soft tissues of human anatomy directly or indirectly from image data and other evaluation techniques, which can be combined with reconstruction implant to form a composite structure for pre-operative evaluation.   Finite element modeling and analysis are routine engineering methods to assess the safety and endurance of the physical structures, which can also be applied for the numerical evaluation of fracture reconstruction. The present study delves into the fundamentals of various imaging techniques and techniques for the acquisition of hard and soft tissue densities to extract material properties and introduces the practice of finite element methods for higher analysis and their intended surgical application.
Üstün Yetenekli Çocuk Algı Ölçeği’nin Geliştirilmesi
Authors: DERELİ Fatih , YILMAZ Arif
Published: May 2022

Bu çalışmanın amacı erken çocukluk dönemindeki üstün yetenekli çocuklar hakkında algıları ölçen geçerliği ve güvenirliği kanıtlanmış bir ölçek geliştirmektir. Araştırma kapsamında toplamda 645 okul öncesi öğretmeni ve okul öncesi öğretmen adayı katılımcıdan elde edilen veriler ile geçerlik ve güvenirlik çalışmaları yapılmıştır. Ölçek geçerliği için; uzaman görüşü, Açımlayıcı Faktör Analizi (AFA) ve Doğrulayıcı Faktör Analizi (DFA) gerçekleştirilmiştir. AFA için 318 öğretmen ve öğretmen adayı, DFA için 322 öğretmen ve öğretmen adayından oluşan iki farklı grup üzerinde çalışılmıştır. Verilerin toplanması için araştırmanın katılımcıları kartopu örnekleme yöntemi temel alınarak belirlenmiştir. Araştırmanın yapı geçerliği sonuçlarına göre ölçek; “Üstün Yetenekli Çocukların Özellikleri”, “Üstün Yetenekli Çocukların Belirlenmesi” ve “Üstün Yetenekli Çocukların Desteklenmesi” olmak üzere 34 maddeden oluşan üç faktörlü yapıya sahiptir. Üç faktörlü bu ölçeğin varyansın %49.9’unu açıkladığı sonucuna ulaşılmıştır. DFA uygulaması sonucunda ölçeğin genel olarak iyi uyum değerleri ortaya koyduğu görülmüştür. Ölçek puanlarının güvenirliğe ilişkin hesaplanan alfa değerinin tüm ölçek için .922 ve ölçeğin alt boyutları için sırasıyla .894, .742, .763 olduğu görülmüştür. Buna göre Üstün Yetenekli Çocuk Algı Ölçeği’nin geçerli ve güvenilir bir ölçek olduğu sonucuna ulaşılmıştır.
ÖĞRETMEN SABIR ÖLÇEĞİ: GEÇERLİK VE GÜVENİRLİK ÇALIŞMASI
Authors: MERİÇ Erdal , ERDEM Mustafa
Published: May 2022

Bu araştırmanın amacı, öğretmenlerin sabır düzeylerini belirlemeye yönelik geçerli ve güvenilir bir ölçme aracı geliştirmektir. Araştırma iki farklı çalışma grubu ile gerçekleştirilmiştir. Araştırmanın birinci çalışma grubu Ordu ilinin Ünye ve Fatsa ilçelerinde basit tesadüfi örnekleme yöntemiyle belirlenen kamuya bağlı 20 ilkokulda görev yapan toplam 336 sınıf öğretmeninden; ikinci çalışma grubu ise Ordu ilinin Altınordu ilçesinde basit tesadüfi örnekleme yöntemiyle belirlenen kamuya bağlı 16 ilkokulda görev yapan toplam 257 sınıf öğretmeninden oluşturulmuştur. Veriler analiz edilirken geçerlik için açımlayıcı ve doğrulayıcı faktör analizi yapılmış, güvenirlik için Cronbach Alfa ve kompozit güvenirlik katsayıları ile madde toplam korelâsyonları hesaplanmıştır. Ölçek faktörlerinin birbirleriyle olan ilişkileri korelâsyon analiziyle test edilmiş ve ayrıca aritmetik ortalama ve standart sapma değerleri hesaplanmıştır. Araştırmanın sonucunda iki faktör altında toplanan 11 maddelik “Öğretmen Sabır Ölçeği” geliştirilmiştir. Ölçeğin faktörleri sırasıyla “Öğretim” ve “Etkileşim” olarak isimlendirilmiştir. Ölçekteki iki faktörün birlikte açıkladıkları toplam varyans %46.693’tür. Yapılan güvenirlik analizi sonucunda ölçeğin geneli için Cronbach Alfa katsayıları birinci ve ikinci çalışma gruplarında sırasıyla .81 ve .82 olarak hesaplanmıştır. Ölçeğin alt faktörleri için hesaplanan Cronbach Alfa ve kompozit güvenirlik katsayıları da genel olarak .70’in üzerindedir. DFA sonucunda elde edilen uyum iyiliği indeksleri modelin uyumlu olduğunu ortaya koymuştur (X2/sd=1.83, GFI=.95, AGFI=.92, CFI=.95, NFI=.91, TLI=.94, IFI=.95, RMSEA=.06, SRMR=.05, RMR=.02). Araştırmanın geçerlik ve güvenirlik analizlerinden elde edilen sonuçlar, ölçeğin Millî Eğitim Bakanlığına bağlı okullarda görev yapan öğretmenlerin sabır düzeylerinin belirlenmesinde kullanılabilecek geçerli ve güvenilir bir ölçme aracı olduğunu göstermektedir.
FEN EĞİTİMİNİN ORTAOKUL ÖĞRENCİLERİNDE ÜSTBİLİŞSEL FARKINDALIK ÜZERİNDEKİ ROLÜNÜN İNCELENMESİ
Authors: AYDIN Esra , KILIÇ MOCAN Didem
Published: May 2022

Üstbiliş stratejilerinin etkin bir şekilde kullanılmasının öğrenmenin niteliğini arttırması ve bununla beraber fen eğitiminin üstbilişsel farkındalık kazandırmada etkili bir öğrenme ortamına zemin hazırlaması gerekçeleri ile çerçevesi çizilen araştırmada, ortaokul öğrencilerinin üstbilişsel farkındalıklarının fen eğitimi odağında çeşitli değişkenler açısından incelenmesi amaçlanmıştır. Araştırmaya Sakarya ili merkez ilçesinde 2020-2021 öğretim yılı güz döneminde dört farklı ortaokulda öğrenimlerini sürdüren toplam 501 öğrenci katılmıştır. Öğrencilerin üstbilişsel farkındalıklarını belirlemek için 'Üst Bilişsel Farkındalık Ölçeği B formu' ayrıca demografik özelliklerine ilişkin verilerin toplanması için de 'kişisel bilgi formu' kullanılmıştır. Veriler Mann Whitney U ve Kruskal Wallis testleri ile analiz edilmiştir. Analizler sonucunda ortaokul öğrencilerinde üstbilişsel farkındalığın; cinsiyet ve sınıf düzeyine göre değişmediği, fen bilimleri dersi not ortalaması, fen ile ilgili projeye katılma durumu, fen bilimleri dersinde deney yapma ve fen konularını günlük yaşamda kullanabilme değişkenleri açısından anlamlı bir farklılık gösterdiği bulgusuna ulaşılmıştır. Sonuç olarak öğrencilerin, üstbilişsel farkındalıklarını geliştirebilmeleri için fen konularının öğreniminde ilgili stratejilerin kullanımına olanak bulduğu anlaşılmakta ve bu doğrultuda öğrencilerin üstbilişsel farkındalıklarının gelişmesine imkan sağlayan fen derslerinde öğretmenlerin, öğrenme ortamlarını gerek yöntem ve tekniklerle gerek etkinlik ve materyallerle çeşitlendirmelerinin önemli katkıları olacağı düşünülmektedir.
Evidence of retinal arteriolar narrowing in patients with autosomal-dominant polycystic kidney disease
Authors: Pietrzak-Nowacka Maria , Lejkowska Renata , Kawa Miłosz Piotr , Ulańczyk Zofia , Safranow Krzysztof , Nowacka Barbara , Podborączyńska-Jodko Karolina , Lubiński Wojciech , Ciechanowski Kazimierz , Machaliński Bogusław , Machalińska Anna
Published: May 2022

Introduction

The aim of this study was to examine retinal vessels in autosomal dominant polycystic kidney disease (ADPKD) patients with normal kidney function and without diabetes mellitus.

Materials and Methods

We enrolled 39 adult individuals with ADPKD and 45 gender- and age-matched individuals as controls. A full ophthalmologic examination, including retinal vessel caliber and reactions to flicker stimulation analysis and grading of hypertensive retinopathy according to the Keith-Wagener classification, was performed.

Results

Multivariable analysis of ADPKD patients and controls, adjusted for age, gender, estimated glomerular filtration rate (e-GFR) and the presence of hypertension, revealed that ADPKD was an independent factor associated with lower arteriovenous ratio (AVR) values (by 0.069 on average, β = −0.50, p < 0.0001). The severity of hypertensive retinopathy according to the Keith-Wagener classification appeared to be more advanced in the ADPKD group than in the controls, despite the lack of vascular abnormalities, such as retinal hemorrhages, exudates, cotton wool spots or papilledema, as well as microaneurysms, which are very characteristic signs of ADPKD in other vascular beds.

Conclusions

Lower AVR values could be a specific pathophysiological ocular manifestation of systemic vasculopathy in the course of ADPKD.
Effect of Surface Modification of Himalayan Nettle Fiber and Characterization of the Morphology, Physical and Mechanical Properties
Authors: Deepa R , Kumaresan K , Saravanan K
Published: May 2022

The process of retting bast fiber plants for the production of long fiber has presented major challenges. Water retting, dew retting, chemical extraction, and micro-organism (fungi, enzymes) techniques were applied to the extraction of natural fibers. The two nettle samples were extracted with water retting for 14 days and dew retting for 4 weeks. This research investigated the effects on the traditional retting process of nettle fiber by fungi and bacteria formation in lignocellulosic. The latter biological extraction methods successfully degraded the lignin and pectin materials of the fiber and increases the cellulose content. These extraction methods produced high quality fiber and tensile strength at a low cost. This study determined the chemical, physical, and mechanical characteristics such as fiber cellulose, non-cellulosic content, tensile strength, tenacity, and elongation break to see how treatments affected them. The treated fiber surface morphology was characterized using scanning electron microscopy. To evaluate functional group alterations, Fourier-transform infrared spectroscopy was used on the fiber specimen.
Study of Conceptual Knowledge and Mode of Reasoning Relating to the Characteristics of Covalent Bonds in Future Algerian Physics Teachers
Authors: Hazzi Salah , Djouahra Idris , Dumon Alain
Published: May 2022

In this study we tried to analyse how future teachers of Ecole Normale Supérieure (ENS) school who are at the end of education have integrated the specifications of covalent bonds in the different bond orders in terms of symmetry, stability, length, localisation (in the case of structures of ethane, ethylene and acetylene) or delocalisation of electrons (case of benzene). The analysis of responses to a written questionnaire shows that the majority of students have only integrated some knowledge, which may be termed as procedural, on the structural elements of molecules such as stability and the length of bonds. Although possessing some conceptual knowledge, students tend to use an alternative way of reasoning arising from the mental representation that single and multiple bonds are independent entities: the single bond is a “σ bond” while the double bond is considered only as a “π bond”.
Numerical Modeling and Diagnostic of FRC Slab under Centric and Eccentric Load
Authors: Marcalíková Zuzana , Čajka Radim
Published: May 2022

The solved area of research is the slab in interaction with the subsoil, where the goal is numerical modeling of the problem using a 3D computational model and nonlinear analysis. Specifically, the case of two experiments with a slab with centric and eccentric loading is solved. The performed experiments are used after for numerical modelling when a comprehensive set of laboratory tests of mechanical properties of fiber-reinforced concrete is also performed. Specifically, compressive strength, modulus of elasticity, splitting tensile test and bending tensile test were performed. The performed experiments are evaluated using 2D sections and 3D approximation surfaces, which are then used for load-displacement diagrams. Numerical modeling is based on nonlinear analysis and the use of the finite element method. The computational model use isoparametric finite elements. Based on the performed experiments and numerical modeling, the evaluation of the solved task is performed.
Reducing Energy Consumption in the Design of Railway Lines - Compensated Curve of the Vertical Track Gradient
Authors: Hodás Stanislav , Pultznerová Alžbeta
Published: May 2022

Trains that pass through several structural objects must overcome resistances acting against the train run. In case the track gradient of railway line is designed in values approaching the maximum allowable standard track gradient. Further adjustment of the elevation curve is possible by using secondary changing points between the main changing points of gradient, especially in the curve sections and tunnels. The elevation course will be modified by reducing the gradients in those sections by the anticipated resistances from these construction objects as circles, tunnels, etc.). A compensated curve can be designed to provide a smoother pass through the individual secondary sections of the track in rising gradient with reduced gear shifting of the locomotive engine and the train continues with fluent output, thus saving some energy consumed by the engine. The compensated curve is particularly suitable for long and heavy freight trains in mixed operation, but all other types of trains running on the track can also use this. The paper describes the compensated curve of the level of the gradient from the point of view of the designer in railway construction with practical calculations.
Reliability Analysis of Floors for Vibration Performance
Authors: Nguyen Huu Anh Tuan
Published: May 2022

In this paper, the vibration serviceability of a two-bay composite floor under walking excitation was evaluated via both deterministic and stochastic methods. The floor framing was irregular with one bay being about 25 % longer than the other. Using the deterministic approach recommended by a widely recognized design guide, it was predicted that the vibration levels in both floor bays due to footfall were deemed acceptable in terms of human comfort in an office environment. The stochastic approach took account of random variations in the floor modal properties, the loading and the tolerance vibration limit. Statistical properties of the random variables were determined by reference to contemporary floor vibration guidelines as well as a modal analysis of the finite element model of the floor. Close-formed formulas for use with the first-order reliability method were developed to predict the failure probability of the floor. Reliability analysis using Monte Carlo simulation with a sufficiently large number of trials was also performed. Both of the analytical and numerical reliability analyses revealed an exceedance probability of around 36 % for the longer floor bay, which was in marked contrast to the deterministic method. For the shorter floor bay, a failure probability of practically zero was found by the random procedures. Furthermore, the excellent agreement between the results acquired from the first-order reliability method and the Monte Carlo simulation highlights the effectiveness of the former approach which requires much less computation effort.
Nonlinear Analysis of Hollow Slender Reinforced Concrete Columns Subjected to Concentric and Eccentric Loads
Authors: Braidi Wameedh Issa , Ali Mohammed Salih Abd
Published: May 2022

This paper investigates the load capacity and failure modes of slender hollow RC column under axial and eccentric loads. For the slender hollow columns, different load eccentricities and hole shapes are used. The finite element software ABAQUS is used to model and analyze the columns. The experimental test result is used to conduct a verification investigation of the nonlinear finite element modeling. All specifications of the experimentally tested columns are taken into consideration in the modeling to establish the verification of the model. When the modeling and test results are compared, it is noticeable that they are in good agreement. As a result, the modeling’s accuracy is proved. Then, a parametric study included different slenderness ratio, section shape, concrete strength and SFR strengthened has been done with the same modeling method. The effects of these variables on the column load capacity are investigated. It is found that increasing slenderness ratio led to smaller peak load. Increasing of moment of inertia of square and circular section decreased the peak load capacity. The maximum bearing capacity increased with higher concrete strength. Also, SFR distribution through the length of columns effected on load bearing capacity.
Three-Dimensional Permeability Study of Open Graded Friction Course (OGFC) Based on CFD Simulation
Authors: Elkhateeb Omar , Shuwen Zhang , Hu Feng , Pengfei Zheng
Published: May 2022

This research evaluated permeability and hydraulic conductivity of Open Graded Friction Course (OGFC) in multiple directions. Using Computational Fluid Dynamics (CFD), Ansys Fluent was utilized to simulate the laminar flow model for twelve cubic specimens of OGFC with different geometry and various porosities. Reynolds number (Re
), permeability (K), and hydraulic conductivity (k) were computed for each simulation horizontally and vertically. According to the study, the horizontal permeability measurements were greater than the vertical measurements. Moreover, the permeability of OGFC is governed by the percentage of the air voids, aggregate particle size, and the thickness of the specimens. As the diameter and percentage of air voids increased, the permeability increased. Specimens with large size of aggregates and larger thicknesses have the highest values of permeability, while specimens with the small size of aggregates have the lowest values of permeability. In addition, the velocity of the flow inside the voids decreased as the diameter and percentage of air voids increased, while the pressure increased, according to the study.
Selection of Intersection Control Type in Urban Areas
Authors: Ramadan Ibrahim M. I. , Abdel-Monem Mohamed S. , Ahmed Osama H.
Published: May 2022

In Egypt, urban planning projects usually do not consider the intersection type. This study developed charts for practitioners that could be used to determine the optimal intersection. The paper studied intersections including; signalized, roundabout, and two-way stop control. It provides a study for the intersection at the targeted level of service D. The traffic patterns were used to calculate the intersection’s capacity and the average control delay. The combinations of turning distribution, percent of heavy vehicles, and type of control were considered. The relationship among capacity, delay and traffic volume has been used to deduce the minimum required lane configuration for each intersection. The results indicated that the roundabout is the best alternative for intersection control with maximum capacity and minimum delays for medium traffic. However, signalized intersection is the best alternative at heavy traffic volumes and a high proportion of left-turning volume.
Preliminary Study on the Reduction in Shear Strength Parameters of Gypseous Soil upon Wetting
Authors: Abd Akram H.
Published: May 2022

The main aim of the study is to provide a preliminary formula to estimate the reduction in shear strength parameters of gypseous soil exhibited when soaked in water. Experimental work has been conducted using direct shear test on undisturbed samples with three different gypsum contents 4 %, 28 %, and 42 %. Three different cases were considered, first is soil with its field water content (semi-dry), second after soaked with kerosene, and third after soaked with distilled water. The kerosene was used for comparison purposes substituting water for non-gypseous soils because it has low chemical interaction with gypsum. For semi-dry cases, results show proportional relationship between peak shear strength and gypsum content. However, the opposite holds true once submerged with water in which soil cohesion fades and the frictional angle is reduced to 72 %, 56 %, and 52 % respectively for the given gypsum content. A formula has been proposed that can be used by practitioners to estimate the reduction in the frictional angle based on the gypsum content of the soil.
Assessment of the Flood and Drought Occurrence Using Statistically Downscaled Local Climate Models: A Case Study in Langat River Basin, Malaysia
Authors: Voon Kah Loon , Tan Kok Weng , Chin Kah Seng
Published: May 2022

Climate change is a complex and multi-layer issue with global and local entanglement. In this study, Langat River Basin is chosen. Secondary data was used including the historical flood and drought event reports, Standardized Precipitation Index-1 data and Canadian Earth System Model (CanESM2) along with Australian Community Climate and Earth System Simulator Coupled Model (ACCESS CM-2). These data were used to determine the monthly flood and drought precipitation risk based on five regions of Langat River Basin. The CanESM2 and ACCESS CM-2 based on RCP 4.5 and RCP 8.5 scenarios were downscaled and bias corrected for this study. The reliability of these models was then analyzed with Pearson correlation and probability density function (PDF). The future flood and drought risks from year 2020 to 2100 were predicted using the most reliable local climate model local climate hazard thresholds. The CanESM2 RCP 4.5 scenario was identified to have moderate relationship with the historical precipitation trend in Langat River Basin. The Pearson correlation outcomes were then verified by analyzing the PDF curve between models and historical precipitation. The result shows that the downscaled CanESM2 RCP 4.5 was determined to have moderate correlation r = 0.30, whereas highest similarity with the historical precipitation trend 98.63 % based on 2006 to 2018 period. The scenario is consistent with medium emission coupled with increasing mitigation efforts in Malaysia. Furthermore, the flood and drought risk assessment outcomes show that the occurrence rate for Central, Northern, Southern, Western, and Eastern region in Langat River Basin were determined as 41.97 %, 60.19 %, 40.23 %, 20.16 %, and 34.98% respectively. The Central region was predicted having two drought incidences (February 2069 and February 2099) due to extreme dry season predicted based on 2020 to 2100 period.
Experimental Verification of Modified Sub-Ballast Layers, Application of Foam Glass Boards
Authors: Dobeš Peter , Ižvolt Libor , Mečár Martin
Published: May 2022

Glass waste decomposition time in landfills or the countryside can exceed several millennia. Recycling and finding new uses for municipal waste, where glass accounts for approx. 10 % of the volume, is therefore essential to ensure the sustainable development of society. A novel method of reusing glass waste is to produce a thermal insulation material called foam glass in the form of boards. The manufacturer characterises the foam glass boards as having extreme compressive strength and being suitable for highly loaded building structures. The Department of Railway Engineering and Track Management (DRETM) has been long-term researching the possibility of applying various thermal insulation materials (composite foam concrete, Liapor concrete, extruded polystyrene boards) to the sub-ballast layers. For the above reasons, an experimental field was constructed to validation a modified design of the sub-ballast layers with embedded foam glass boards. The paper’s objective was to verify whether the modified composition of the sub-ballast layers affects the increase of its deformation resistance. The assessment of the deformation resistance of the sub-ballast layers of the modified and standard construction was performed by a series of static load tests in the particular structural layers.
Xylophagous beetles (Coleoptera) in the zones of Gomilshanski lisy National Nature Park with different management regime
Authors: Meshkova Valentyna , Skrylnik Yuriy , Bieliavtsev Maxim , Zinchenko Olga , Borysenko Oleksandr , Markina Tetiana
Published: May 2022

The purpose of the research was to assess the species composition and biodiversity indices for xylophagous beetles collected by window traps in the parts of Gomilshanski lisy National Nature Park with different management regimes and anthropogenic load. Four window traps were placed in each of the five groups of sample plots: clear felling, selective felling, stationary recreation, regulated recreation and protected zone. The data were analysed using the statistical software package PAST, particularly, the Menhinick index (DMn) and dominance index (D) were evaluated and classical clustering (unweighted pair-group average [UPGMA]) was performed. A total of 42 species of xylophages (9903 individuals) were collected from Curculionidae (Scolytinae and Cossoninae), Cerambycidae, Histeridae, Bostrichidae, Buprestidae and Lymexilidae. The highest species richness was in the plots of clear and selective felling (25 and 22 species, respectively) and the lowest was in the protected zone (16 species), regulated recreation (19 species) and stationary recreation (22 species). The Menhinick index (DMn) was the lowest in the protected zone (0.27), increased in the zone of regulated recreation (0.43) and stationary recreation (0.45) and was maximal in the plots of selective and clear felling (0.69 and 0.77, respectively). The number of individuals was maximal in the protected zone and minimal at the plots of selective and clear felling. All sites were dominated by Xyleborinus saxesenii (Ratzeburg, 1837) (66–85% individuals) and Anisandrus dispar (Fabricius, 1792) (8.5–20.7% individuals). Minimal dominance (0.49) was found in the plot of clear felling. Cluster analysis showed similarity of the xylophage complex in the plots of clear and selective felling, as well as in the zone of stationary and regulated recreation, which differed from the protected zone.
Formation of European beech stands (Fagus sylvatica L.) that involve Scots pine (Pinus sylvestris L.) in tree species composition in the Ukrainian Roztochie
Authors: Myklush Yuriy , Myklush Stepan , Debryniuk Iurii , Hayda Yuriy
Published: May 2022

Productive European beech stands (Fagus sylvatica L.) involving Scots pine (Pinus sylvestris L.) are formed in Ukrainian Roztochie. Considering value and limited distribution of beech stands involving pine in tree species composition, it is necessary to work out and implement measures for their natural restoration in connection with the climate change and the efficient use of raw materials and non-wood products. Main forestry and management indices of beech stands that include pine in tree species composition were analysed. Forestry activities that are currently carried out in middle-aged and maturing stands significantly reduce their relative completeness and growing stocks, as determined by comparing growth particularities of productive beech stands from different sources.
Prospects of cultivation of Jack pine (Pinus banksiana Lamb.) on sandy soils of natural–technogenic origin in Kyiv Polissia
Authors: Brovko Fedir , Yukhnovskyi Vasyl , Brovko Dmytro , Brovko Olha , Minder Victoria , Urliuk Yurii
Published: May 2022

The aim of the research was to identify the influence of environmental factors inherent in the alluvial and displaced sands of the study region on the growth of the Jack pine and the prospects for its cultivation. We found that the success of growth of Jack pine seedlings on sandy soils depends on a set of factors, which include the presence or absence, in the rhizosphere of sand, of humus impurities and genetic horizons of zonal soils, silty or loamy layers, soil density and composition of pine stands formed in the cultivation. On alluvial sands, sparse forests of Jack pine and Scots pine with a density of 0.3 units were formed. The yield of seeds from Jack pine cones was 1–2% higher than the normative values, and the mass of 1000 seeds was 50% higher. Jack pine seedlings grow according to I class of productivity on displaced sands, with an admixture of humus mass and remnants of genetic horizons of zonal soils at the root depth. In the rhizosphere of the stand, the roots of Jack pine seedlings occupied 78% of the mass of all roots that inhabited a metre-thick sand. Jack pine seedlings that fall under the canopy of Scots pine fall out of the plantations due to drying, which indicates their demand for light and appropriateness of growing Jack pine in solitary plantings or in mixed low-density plantations with Scots pine.
Peatlands restorer plant species in the protected forest area
Authors: Nursanti Nursanti , Novriyanti Novriyanti , Indriyani Arisa Dwi , Anggraeni Nurul , Paiman Asrizal
Published: May 2022

Like other ecosystems, burnt peatlands will run into natural regeneration, characterized by pioneer plants’ presence as a succession process guard. However, annual burnt peatlands can complicate vegetation growth, including the pioneer's presence. Besides that, it is unknown what kind of grow pioneers are, so the research aims to find out the pioneer plants’ diversity on burnt peatlands is essential. The reasonably extensive distribution of peat ecosystems and high fire potential in Sumatra is Tanjung Jabung Regency of Jambi Province selected to study. The locations of plant species inventory are Orang Kayo Hitam Forest Park (burnt five times), village forest (HD) Sinar Wajo, and HD Koto Kandis Dendang (each burnt once) using the Nested Quadrat and Line Transect of vegetation survey method. Vegetation analysis showed that 22 pioneers were found in HD Sinar Wajo and 27 species in HD Koto Kandis Dendang. Some are identified as ferns (Pteridophyta), breed with spores, and pioneer plants reproduce by seeds (Spermatophyta). In Orang Kayo Hitam Forest Park found 26 species consisting of plants, trees, shrubs, and lianas. Among the three locations, we found the same type of pioneer. It is implied that patterns and regeneration processes can help each other in the same landscape.
Tackling uncertain future scenarios with real options: A review and research framework
Authors: Gorupec Natalia , Brehmer Nataliia , Tiberius Victor , Kraus Sascha
Published: May 2022

Real options are widely applied in strategic and operational decision-making, allowing for managerial flexibility in uncertain contexts. Increased scholarly interest has led to an extensive but fragmented research landscape. We aim to measure and systematize the research field quantitatively. To achieve this goal, we conduct bibliometric performance analyses and bibliographic coupling analyses with an in-depth content review. The results of the performance analyses show an increasing interest in real options since the beginning of the 2000s and identify the most influential journals and authors. The science mappings reveal six and seven research clusters over the last two decades. Based on an in-depth analysis of their themes, we develop a research framework comprising antecedents, application areas, internal and external contingencies, and uncertainty resolution through real option valuation or reasoning. We identify several gaps in that framework, which we propose to tackle in future research.
Weld defects and precipitates of deposited metal in 9Ni steel welded joint
Authors: Ma Chengyong , Qi Yanchang , Zhang Yuqing , Wu Zhiquan , Zhang Xin
Published: May 2022

Three kinds of electrode with different niobium contents were developed and compared, and the influence of alloying elements on microstructure and mechanical properties was summarized. Strong carbide elements such as Nb, Ti, and V were added to form stable precipitates. The existence of intercrystalline precipitates leads to pinning and zigzag of grain boundaries, hinders the propagation of cracks, and enhances the low temperature strength and impact toughness of the materials. The No. 1 and No. 2 ENiCrMo-6 electrodes meet the requirements of LNG (liquified natural gas) equipment. The tensile strength of the deposited metal reaches 687 MPa, while the average impact energy at −196°C is 131 J. Owing to fluctuations in the stress concentration at the junction of grain boundaries, cracks may easily form. MC carbide can retard the crack propagation. With the increase of Nb and other alloys, the strength and hardness increase gradually, but the plasticity and toughness are retarded to a certain extent.