bluuebunny/crossref_metadata_2025_split huggingface dataset:
Quality of automotive sand casting with different wall thickness from progressive secondary alloy
Authors: Pastierovičová Lucia , Kuchariková Lenka , Tillová Eva , Chalupová Mária , Pastirčák Richard 
Published: May 2022

Abstract
This paperwork is focused on the quality of AlSi6Cu4 casting with different wall thicknesses cast into the metal mold. Investigated are structural changes (the morphology, size, and distribution of structural components). The quantitative analysis is used to numerically evaluate the size and area fraction of structural parameters (α-phase, eutectic Si, intermetallic phases) between delivered experimental material and cast with different wall thicknesses. Additionally, the Brinell hardness is performed to obtain the mechanical property benefits of the thin-walled alloys. This research leads to the conclusion, that the AlSi6Cu4 alloy from metal mold has finer structural components, especially in small wall thicknesses, and thus has better mechanical properties (Brinell hardness). These secondary Al-castings have a high potential for use in the automotive industry, due to the thin thicknesses and thus lightweight of the construction.
Project of Micro-hydroelectric Power Generation System – Case study
Authors: Grebski Wes , Grebski Michalene 
Published: May 2022

Abstract
The article describes a student project of installing a micropower generation system utilizing energy from the water drained from underground coalmines. The paper contains a description of the site which is a manmade phenomenon from the anthracite mining era. The project described in the article was completed as part of the project-based learning curriculum. Students had the opportunity to work on a team and apply theoretical knowledge learned in individual courses as part of the engineering curriculum. The article also focuses on the calculation of the potential power capacity to a proposed hydropower generation system. The proposed micro-hydro system is harvesting the potential and kinetic energy of the water discharged from the water-draining tunnel. A commercially available micro-hydro turbine combined with an electric power generator was adapted for this purpose. The article also includes an analysis of the profitability of the project and the time of return on investment. The calculations are based on the current price of electricity (2021), depreciation schedule and present tax incentives (2021) to generate electricity from renewable sources. The article also includes some lessons learned from the project as well as the recommendations for future projects.
جيلوجية منطقة السلمان وبعض استعمالات الارض فيها
Authors: عذاب خليف الهربود حسين 
Published: May 2022

يهتم البحث بدراسة الجيولوجية والنقل والتعدين واستعمالات لإغراض أخرى في منطقة (السلمان)(* ) جنوبي غرب العراق الصورة(1) بالاعتماد على الصور الجوية والمرئيات الفضائية والخرائط الطوبوغرافية التي تغطي منطقة الدراسة ، فضلاً عن العمل الميداني الذي مكن الباحث من الاطلاع عن كثب على هذه الظواهر في منطقة الدراسة.
وتجسيداً لمقولة (Erdman, 1943) (أن الجيومورفولوجي قد حباه الله عيناً فاحصة لسطح الأرض لها القدرة على التمييز والتحقق من المظاهر الغامضة التي كثيراً ما تخدع المرء)(1). تضمنت هذه الدراسة ما يأتي:
أولاً: موقع منطقة البحث
تقع منطقة الدراسة في الصحراء الجنوبية الغربية من العراق بين دائرتي عرض
07َ 30 و 30ً 37َ 30ْ شمالاً وخطي طول 15َ 44ْ و 30ً 52َ 44ْ شرقاً إلى الغرب من مدينة السماوة، إذ تبعد منطقة السلمان عن مركز مدينة السماوة مسافة (160 كم) وعن مركز ناحية بصية في الشرق نحو (200 كم) وعن ناحية الشبجة التابعة إلى محافظة النجف في الشمال الغربي نحو (100 كم).
تبلغ مساحة منطقة الدراسة (3229.557 كم2) وإدارياً تقع ضمن حدود قضاء السلمان التابع إلى محافظة المثنى. الخريطة(1) و الشكل(1).

ثانياً: مشكلة البحث
تتمثل مشكلة البحث في طرح مجموعة من التساؤلات ثم الإجابة عليها لكي نتمكن من وضع الحلول المناسبة لها ومن هذه التساؤلات ما يأتي:-
1-	ما هي التكوينات الجيولوجية المنتشرة في منطقة الدراسة؟
2-	ما هي المشكلات التي تواجه طرق النقل في منطقة الدراسة؟
3-	ما هي المعادن المنتشرة في المنطقة؟
4-	ما هي الأسباب التي أدت إلى تركزها في المنخفضات دون سواها؟
5-	ما هي الظروف التي ساعدت على أن تكون منطقة السلمان معتقلاً رهيباً؟
ATLAS results on charmonium production and Bc+ meson production and decays
Authors: Lyubushkina Tatiana 
Published: May 2022

Recent results from the proton-proton collision data taken by the ATLAS experiment on the charmonium production and on the Bc+ meson production and decays are presented. The measurement of J/ψ meson and ψ(2S) meson differential cross sections is reported. New results on the Bc+ meson decays to J/ψ Ds(*) final states are included. Both studies are based on pp collision data collected at √s=13 TeV during the LHC Run 2, corresponding to an integrated luminosity of 139 fb-1. The measurement of the differential ratios of the Bc+and B+ mesons production cross sections at √s=8 TeV with an integrated luminosity of 20.3 fb-1is also discussed.
The Importance of Socio-economic Development to Sustainable Natural Resources Management in Rural Areas: A Case Study of Sustainable Livelihoods and Forest Management in Xuan Nha Nature Reserve in Northwestern Vietnam
Authors: Luyen Nguyen Thi , Son Ngo Thanh 
Published: May 2022

Sustainable forest management is facing threats such as deforestation, forest degradation, and biodiversity loss due to socio-economic conditions, a weak governance capacity, and lack of public participation. In Xuan Nha Nature Reserve, about 50% of the total population are living below the poverty level and their livelihoods are depending on forest. The community’s activities have been creating pressures on the forest by reducing the forest area, increasing forest land degradation, and through illegal logging. The objectives of the study were to (i) identify sustainable livelihood options; (ii) the most suitable livelihood practices with the purpose of reducing poverty for local communities and their dependency on forest resources; and (iii) recommend suitable policies to reduce the conflict between socio-economic development and forest management. In order to achieve these objectives, we used the LIFE (livelihood, income, forest condition, and equity); the Sustainable Livelihood Framework; and the Advocacy Coalition Framework. The results showed that fruit orchards and beekeeping were two suitable livelihood options for the buffer areas since there were more convenient assets such as roads, markets, and human knowledge, while fruit orchards and local pig farming were suggested for the ERA (ecological restoration area) and SPA (strictly protected area) to solve the problem of land degradation and maintain the traditional habits of the local community. Regarding policy changes, support for livelihood practices and improvement of the community’s and authorities’ awareness on forest protection was necessary for all the sub-areas for reducing poverty and the pressures on forest resources of the community.
Піднасувні підняття в карпатському регіоні та перспективи їхньої нафтогазоносності
Authors: Monchak L. S. , Anikeyev S. G. 
Published: May 2022

У статті розглянуто перспективи нафтогазоносності мезозойських і неогенових відкладів у піднасувних підняттях у зовнішній зоні Прикарпатського прогину, в межах Прикарпатського грабена і південно-західніше грабена, тобто в межах Складчастих Карпат. Передбачається, що більшість цих підняттів складені мезозойськими теригенно-карбонатними породами, частково неогеновими й палеогеновими нафтовими породами, які мають колекторські властивості, і перекриті неогеновими моласами й насунутим комплексом флішевих порід. В умовах Карпатського орогена сейсморозвідкою не завжди вдається визначити положення склепіння споруд через недостатню простежуваність горизонтів відбиття. Пошукове буріння часто виявляється безуспішним. Тому розроблення нових недорогих методів прогнозування нафтогазоперспективних підняттів є актуальним. Представлена методика інтерпретації геолого-гравіметричних матеріалів. Ці підняття виділяються в результаті аналізу геолого-геофізичних матеріалів, зокрема геолого-тектонічних карт, даних буріння, карт гравітаційних аномалій та даних геолого-гравіметричного моделювання за профілями, які зазвичай перетинають склепіння підняттів. Геолого-гравіметричне моделювання ґрунтується на розв’язанні зворотної задачі гравіметрії. Геолого-тектонічна характеристика перспективних ділянок ілюструється структурними картами й геощільнісними розрізами, які побудували автори. Геощільнісні моделі геологічних розрізів узгоджуються з гравітаційними аномаліями. Кількість виявлених підняттів перевищує 50. Ряд підняттів, крім тих, які під ложем Карпат, розміщується на порівняно невеликих глибинах, доступніших для буріння. Рекомендовано місця для буріння пошукових свердловин.
Extensions of two constructions of Ahmad
Authors: Goh Jun Le , Lempp Steffen , Ng Keng Meng , Soskova Mariya I. 
Published: May 2022

In her 1990 thesis, Ahmad showed that there is a so-called “Ahmad pair”, i.e., there are incomparable Σ 2 0 -enumeration degrees a 0 and a 1 such that every enumeration degree x < a 0 is ⩽ a 1 . At the same time, she also showed that there is no “symmetric Ahmad pair”, i.e., there are no incomparable Σ 2 0 -enumeration degrees a 0 and a 1 such that every enumeration degree x 0 < a 0 is ⩽ a 1 and such that every enumeration degree x 1 < a 1 is ⩽ a 0 . In this paper, we first present a direct proof of Ahmad’s second result. We then show that her first result cannot be extended to an “Ahmad triple”, i.e., there are no Σ 2 0 -enumeration degrees a 0 , a 1 and a 2 such that both ( a 0 , a 1 ) and ( a 1 , a 2 ) are an Ahmad pair. On the other hand, there is a “weak Ahmad triple”, i.e., there are pairwise incomparable Σ 2 0 -enumeration degrees a 0 , a 1 and a 2 such that every enumeration degree x < a 0 is also ⩽ a 1 or ⩽ a 2 ; however neither ( a 0 , a 1 ) nor ( a 0 , a 2 ) is an Ahmad pair.
Alex Demirovic über das Staatsverständnis von Poulantzas als gesellschaftliches Verhältnis
Authors: Jessop Bob , Schmidt (Übersetzung) Dorothea 
Published: May 2022

Der Beitrag erörtert, wie sich Poulantzas’ Analyse von Recht, staatlicher Macht, sozialen Klassen und politischer Strategie entwickelt hat. Danach wird gezeigt, wie Alex Demirovic Aspekte von Poulantzas aufgegriffen und mit anderen staatstheoretischen Fragen verbunden hat. Der zentrale Bezugspunkt ist dabei die überarbeitete und erweiterte Ausgabe der Monografie von Demirovic’ Nicos Poulantzas (2007).
An Investigation of the Impact of Forming Process Parameters in Single Point Incremental Forming Using Experimental and Numerical Verification
Authors: Mezher Marwan T. , Kovács Béla 
Published: May 2022

Incremental sheet forming (ISF) is an innovative cold forming operation and has enticed great interests owing to its flexibility and capability to manufacture various complex 3D shapes with low costs and minimum requirements. Single point incremental forming (SPIF) is the most popular type of ISF process and has high quality and less occurrence of defects for the formed products if the operating parameters are achieved and evaluated with high precision. In this study, the impact of tool diameter and forming angle on the forming force, thickness distribution, thinning ratio, effective plastic strain, forming depth and fracture behaviour was explored. AA1050 aluminium alloy and DC04 carbon steel were employed to produce a truncated cone in accordance with the SPIF process. A 3D finite element model was required to achieve a well-established investigation. The SPIF of a truncated cone numerical model was adopted to build a model with the same conditions as of the experimental work with aid of ANSYS software version 18 through using the workbench LS-DYNA model. The sheet metal modelling was carried out in accordance the Cowper Symonds power law hardening by taking the behaviour of the material as elastic–plastic, and the anisotropic properties were assumed to simulate the plasticity behaviour for two sheet metals. Results indicate that the DC04 carbon steel has a higher forming force, minimum thickness and lower thinning ratio compared with AA1050 aluminium alloy under the same operating conditions.
KONUŞMADA KÜLTÜR ŞOKUNUN SEBEPLERİ VE ÇÖZÜM YÖNTEMLERİ (RUS DİLİNDEKİ BELİRTİSİZ ZAMİR ÖRNEKLERİYLE)
Authors: AKYAR Ali , SOLMAZ İbrahim Hakkı 
Published: May 2022

Modern toplumun gelişiminde küresel eğilimler, bireyin entelektüel ve etkinlik potansiyelinde bir artışa ihtiyaç duymaktadır. Bu ihtiyaçların en önemli çözümlerinden biri, mesleki faaliyetleri için öğrencilere iki ya da üç dil öğretiminde büyük önem taşıyan dil eğitim sisteminin modernleşmesiyle gerçekleştirilebilir.
Rusça ve Türkçe dillerinin çeşitliliği, her zaman hedef dilin iletişim normlarının özümsenmesinin kalitesini etkiler. Bu bağlamda, öğrenme sürecinde öğrencilerin bazı zorluklarla karşılaşabilecekleri ve öğretmenin mesleki faaliyetinin bu zorlukların üstesinden gelmeye ve önlemeye yönelik olması gerektiği dikkate alınmalıdır.
Sosyologların kültür şoku, dilbilimcilerin ise dil girişimi olarak adlandırdığı yabancı dil öğreniminde telaffuz becerisi oluşturmada ortaya çıkan bazı sorunlar da bunlardan biridir. Bu zorlukların analizi yapılmış ve genel olarak psikolojik, metodolojik ve dilbilimsel olarak üç gruba ayrılmıştır.
Yabancı dil öğretiminde doğru telaffuz (orfoepik) konusunda çalışmalar yapan dilbilimcilerin ifadelerinden yola çıkılarak telaffuz becerisini doğrudan etkileyen konuşmadaki kültür şokunu oluşturan sebepler açıklanmış ve bu zorlukların üstesinden gelmek, dil öğretimi ortamlarında doğru telaffuz becerisi oluşturmak için başvurulabilecek bazı yöntemler belirlenmiştir. Ayrıca bu yöntemler Rus dilindeki belirtisiz zamirlerle örneklendirilmiş ve sözcüklerin telaffuzunda oluşabilecek sorunlar belirtilip, doğru aktarımın nasıl uygulanacağı açıklanmıştır.
Çalışmamızın amacı, Türkiye’de Rusça öğrenim gören öğrencilerin Rusça kelimelerin doğru telaffuzu konusunda yaşadığı sıkıntıların sebeplerini analiz etmek ve sorunun çözümü için özellikle Türk öğrencilere Rusça öğretirken konuşmada kültürel şoku aşmanın bir yolu olarak linguodidaktik yaklaşımların kullanımının özelliklerini ele almaktır.
PEMANFAATAN KEONG BAKAU (Telescopium telescopium) SEBAGAI BIOFILTER DALAM MEMPERTAHANKAN KUALITAS AIR SECARA FISIK PADA MEDIA PEMELIHARAN IKAN NILA (Oreochromis niloticus)
Authors: Wanti Wanti , Ruslaini Ruslaini , Rahman Abdul 
Published: May 2022

ABSTRAK Penelitian ini bertujuan mengetahui pengaruh pemanfaatan (T.telescopium) sebagai biofilter dalam mempertahankan kualitasair air secara fisik pada media pemeliharaan ikan nila (O.niloticus). Keong bakau digunakan berukuran 11 g dan ikan nila 5 g. Keong bakau dan ikan nila dipelihara selama 30 hari dalam akuarium berukuran 35x40x35 cm berisikan air 42 liter. Perlakuan yang diterapkan adalah A (kontrol), B (10 keong bakau), C (15 keong bakau) dan D (20 keong bakau) setiap unitnya berisikan 15 ekor ikan nila. Selama pemeliharaan, pemberian pakan dilakukan secara adlibitum pagi dan sore hari. Rancangan digunakan dalam penelitian yaitu rancangan acak lengkap dengan 4 perlakuan dan 3 ulangan. Hasil penelitian diperoleh nilai variabel TSS untuk perlakuan A,B,C dan D secara berurutan yaitu 1,52 mg/L, 1,25 mg/L, 0,99 mg/L, dan 0,77 mg/L. Nilai variabel TOM secara berurut adalah 3,85 mg/L, 2,88 mg/L, 1,96 mg/L, dan 1,78 mg/L. Variabel pertumbuhan mutlak organisme ikan nila masing-masing perlakuan secara berurutan adalah 17,22 ± 17,83g, 19,98 ± 19,15g, 20,52 ± 21,51g, dan 22,85 ± 23,05g dengan kelulushidupan 100% untuk semua perlakuan. Anova menujukkan bahwa variabel TSS tidak berpengaruh nyata antar perlakuan, namun pada variabel TOM memberikan pengaruh secara signifikan. Demikian terhadap pertumbuhan mutlak dan tingkat kelangsungan hidup ikan nila tidak berpengaruh antar perlakuan. Pemberian keong bakau sangat layak digumakan sebagai biofilter pada kegiatan budidaya.Kata Kunci : keong bakau, Ikan nila, Pertumbuhan Mutlak, Kelangsungan Hidup.
Measuring Human Corneal Stromal Biomechanical Properties Using Tensile Testing Combined With Optical Coherence Tomography
Authors: Song Yi , Wu Di , Shen Min , Wang Like , Wang Congzheng , Cai Yong , Xue Chao , Cheng George P.M. , Zheng Yongping , Wang Yan 
Published: May 2022

Purpose: To investigate the ex vivo elastic modulus of human corneal stroma using tensile testing with optical coherence tomography (OCT) imaging and its correlation with in vivo measurements using corneal visualization Scheimpflug technology.Methods: Twenty-four corneal specimens extracted from stromal lenticules through small incision lenticule extraction were cut into strips for uniaxial tensile tests. In vivo corneal biomechanical responses were evaluated preoperatively using the corneal visualization Scheimpflug technology (CorVis ST). The correlation of the elastic modulus with clinical characteristics and dynamic corneal response parameters were analyzed using Spearman’s correlation analysis.Results: The mean low strain tangent modulus (LSTM) of the human corneal stroma was 0.204 ± 0.189 (range 0.010–0.641) MPa, and high strain tangent modulus (HSTM) 5.114 ± 1.958 (range 2.755–9.976) MPa. Both LSTM (r = 0.447, p = 0.029) and HSTM (r = 0.557, p = 0.005) were positively correlated with the stress-strain index (SSI). LSTM was also positively correlated with the A1 deflection length (r = 0.427, p = 0.037) and A1 deflection area (r = 0.441, p = 0.031). HSTM was positively correlated with spherical equivalent (r = 0.425, p = 0.038).Conclusions: The correlation of corneal elastic modulus with A1 deflection parameters and SSI may indicate a relationship between these parameters and tissue elasticity. The HSTM decreased with the degree of myopia. Combining tensile test with OCT may be a promising approach to assess corneal biomechanical properties.
Antifungal and Antibiofilm Efficacy of Paeonol Treatment Against Biofilms Comprising Candida albicans and/or Cryptococcus neoformans
Authors: Qian Weidong , Li Xinchen , Liu Qiming , Lu Jiaxing , Wang Ting , Zhang Qian 
Published: May 2022

Fungal populations are commonly found in natural environments and present enormous health care challenges, due to increased resistance to antifungal agents. Paeonol exhibits antifungal activities; nevertheless, the antifungal and antibiofilm activities of paeonol against Candida albicans and Cryptococcus neoformans remain largely unexplored. Here, we aimed to evaluate the antifungal and antibiofilm activities of paeonol against C. albicans and/or C. neoformans (i.e., against mono- or dual-species). The minimum inhibitory concentrations (MICs) of paeonol for mono-species comprising C. albicans or C. neoformans were 250 μg ml−1, whereas the MIC values of paeonol for dual-species were 500 μg ml−1. Paeonol disrupted cell membrane integrity and increased the influx of gatifloxacin into cells of mono- and dual-species cells, indicating an antifungal mode of action. Moreover, paeonol at 8 times the MIC damaged mono- and dual-species cells within C. albicans and C. neoformans biofilms, as it did planktonic cells. In particular, at 4 and 8 mg ml−1, paeonol efficiently dispersed preformed 48-h biofilms formed by mono- and dual-species cells, respectively. Paeonol inhibited effectively the yeast-to-hyphal-form transition of C. albicans and impaired capsule and melanin production of C. neoformans. The addition of 10 MIC paeonol to the medium did not shorten the lifespan of C. elegans, and 2 MIC paeonol could effectively protect the growth of C. albicans and C. neoformans-infected C. elegans. Furthermore, RNA sequencing was employed to examine the transcript profiling of C. albicans and C. neoformans biofilm cells in response to 1/2 MIC paeonol. RNA sequencing data revealed that paeonol treatment impaired biofilm formation of C. albicans by presumably downregulating the expression level of initial filamentation, adhesion, and growth-related genes, as well as biofilm biosynthesis genes, whereas paeonol inhibited biofilm formation of C. neoformans by presumably upregulating the expression level of ergosterol biosynthesis-related genes. Together, the findings of this study indicate that paeonol can be explored as a candidate antifungal agent for combating serious single and mixed infections caused by C. albicans and C. neoformans.
Transjugular Approach to Closure of Patent Foramen Ovale Under the Guidance of Fluoroscopy and Transthoracic Echocardiography: A Case Report
Authors: He Lu , Xue Jian-ying , Du Ya-juan , Xie Xue-gang , Wang Xing-ye , Zhang Yu-shun 
Published: May 2022

BackgroundWe describe a rare case of patent foramen ovale (PFO) associated stroke in a patient with pulmonary embolism, inferior vena cava thrombosis and undergoing filter implantation who successfully underwent PFO closure using the right internal jugular venous approach.Case SummaryThis is a rare case of a 42-year-old patient who presented with stroke and pulmonary embolism and was diagnosed with a PFO, inferior vena cava thrombosis and underwent filter implantation. The patient suffered from stroke and pulmonary embolism successively; that is, embolic events occurred in both the arterial and venous systems. Transesophageal echocardiography (TEE) showed a PFO with an atrial septal aneurysm (ASA), which we considered a “pathological” PFO. Due to the obstructive nature of the inferior vena cava approach, we successfully performed PFO closure via the right internal jugular venous approach under the guidance of X-ray and transthoracic echocardiography (TTE).DiscussionThe right jugular venous approach provides a simple technical solution for patients who require PFO closure when femoral venous access is unavailable, which can be performed under X-ray and TTE guidance.
Stress-Strain-Sorption Behaviour of Smectites Upon Exposure to Dry and Wet CO2
Authors: Zhang Miao , Spiers Christopher James , Liu Jinfeng , Zhou Hongwei 
Published: May 2022

The swelling-shrinkage behavior of smectites induced by interlayer uptake or sorption of CO2 and H2O has been investigated with increasing interest recent years, primarily because of its potential impact on the sealing efficiency of clay-bearing caprocks overlying CO2 storage reservoirs. To get a better understanding of the stress-strain-sorption coupling in smectite exposed to supercritical CO2, we performed multiple stepwise axial loading and unloading, oedometer-type experiments on ∼1 mm thick discs of pre-pressed Na-SWy-1 and of Ca-SAz-1 montmorillonite. Initially air-dry (AD) samples were first tested in the presence of wet CO2 (20% RH) at 10 MPa pressure, and in the vacuum-dry (VD) state in the presence of pure (dry) CO2 at 10 MPa. The samples were incrementally loaded and unloaded at 40°C, employing effective axial stresses ranging from 0.5 to 44 MPa. Control tests using wet and dry He or Ar instead of CO2, were performed to distinguish strains due to loading-related CO2 sorption/desorption from purely poroelastic effects. All samples saturated with CO2 exhibited 30–65% lower apparent stiffness moduli than when saturated with He or Ar, showing that CO2 adsorption/desorption altered the mechanical response of pre-pressed smectites. Relative to the He and Ar tests, swelling strains of a few % (corrected for poroelastic effects) were measured for AD Na-SWy-1 smectite exposed to wet CO2, decreasing from 4.9 to 3.8% with increasing effective axial stresses in the range 1.6–36.2 MPa. AD SAz-1 material exhibited similar tends. VD samples tested with dry CO2 showed much smaller relative swelling strains (0.5–1.5%), which also decreased with increasing applied effective stresses. The experimental data on relative swelling strain versus effective stress are well fitted by a recent thermodynamic model for stress-strain-sorption behavior in coal. Results derived from model fits indicate that smectite-rich rocks have significant storage capacity for CO2 at shallow depths (up to 1.5–2 km) through CO2 sorption by the clay minerals. However, this component of storage capacity is reduced by more than 80% with increasing burial depth beyond 3 km. The model provides a first step towards modelling stress-strain-sorption effects in smectite rich caprocks penetrated by CO2, though further refinements are needed for broader application to the smectite-CO2-H2O system.