bluuebunny/crossref_metadata_2025 huggingface dataset:
Detección in silico de fitomoléculas con potenciales actividades inhibitorias de Nucleolinas (NCL)
Authors: Giménez Vera Sebastián , Gayozo Melgarejo Elvio , Marín Insfran Luis
Published: June 2023

Las nucleolinas son proteínas localizadas generalmente en el núcleo celular, citoplasma y la superficie de las membranas cumpliendo funciones imprescindibles para la fisiología celular. Sin embargo, su mal funcionamiento se encuentra íntimamente relacionado con muchos tipos de cáncer, por lo que pueden ser consideradas como proteínas dianas para la búsqueda de moléculas con potencial inhibitorio con la finalidad de desarrollar nuevas estrategias para combatir al cáncer. Esta investigación tuvo como objetivos detectar fitoconstituyentes que presenten afinidades de interacción por el dominio de unión al ARN (DUA) de las nucleolinas y caracterizar dichas interacciones proteína-ligando mediante el análisis del acoplamiento molecular. Se preseleccionaron quince fitomoléculas con diferentes actividades biológicas para su estudio y se determinó el índice de drogabilidad del dominio DUA de las nucleolinas, las cuales presentaron un valor de 0,80 siendo altamente drogable. Posteriormente, se realizaron las pruebas de acoplamiento molecular entre los fitoconstituyentes seleccionados y la nucleolina. Los datos obtenidos en los ensayos de acoplamiento molecular evidenciaron que los fitoconstituyentes que presentaron mayor afinidad de interacción in silico fueron los triterpenos Maytenina, Taraxerol, Cucurbitacina B y Pristimerina, los cuales demostraron valores de energías libre de interacción (ΔG) iguales a -10,80±0,03 kcal.mol-1, -10,58±0,14 kcal.mol-1, -9,58±0,12 kcal.mol-1 y -9,48±0,35 kcal.mol-1 respectivamente. Los residuos involucrados activamente en las interacciones con las biomoléculas estabilizando la formación de la estructura de los complejos proteína-ligando fueron Asn100, Tyr103, Tyr134 y Arg158. Los hallazgos sugieren que dichos triterpenos podrían actuar como potenciales inhibidores de las nucleolinas debido a las afinidades manifestadas, sin embargo, estos resultados necesitan ser confirmados mediante ensayos in vitro e in vivo.
Contribuições do profissional de enfermagem no tratamento de pacientes portadores de espinha bífida
Authors: Castro Silvia Oliveira , Silva Daniela Cristina Zica
Published: June 2023

Este trabalho de pesquisa tem o objetivo de apresentar à comunidade acadêmica a importância do profissional de enfermagem no cuidado e assistência no decorrer do tratamento cotidiano de pacientes portadores de espinha bífida. A metodologia realizada foi a revisão narrativa da literatura, embasada pela pesquisa bibliográfica, de caráter descritivo, por meio de materiais bibliográficos eletrônicos. A pesquisa foi realizada no segundo semestre de 2021 através dos portais virtuais Biblioteca Virtual em Saúde (BVS), Pubmed, Lilacs e Scielo.
The effectiveness of public health actions and services in Brazil: The indispensability of defining economic limits
Authors: Nielsen Fernando Nardon , Contini Alaerte Antonio Martelli
Published: June 2023

This research aimed to demonstrate the need to set a cost-effectiveness threshold for access to health. Health was discussed as a fundamental right, but not an absolute one due to the existence of limits that must be built considering the essentiality of the right and the scarcity of resources. The issues of the cost of the right to health and the scarcity of available resources was addressed to highlight the need for a cost-effectiveness threshold in Brazil. The themes were approached from the theoretical references of Stephen Holmes and Cass Sunstein to demonstrate that fundamental rights, including health, always demand positive actions from the State and, consequently, involve costs that can't be ignored. The research is conducted at the interface between human rights and legal economics. As a methodological process, documentary research related to data and bibliographic research is used. The study allowed the interpretation that there are historical, systemic and economic limits to access to health. Finally, there is a need to define a cost-effectiveness threshold in the SUS.
UKRAYNA’NIN TARİHÎ KÖKENLERİ: KİEV KNEZLİĞİ’NDEN KIRIM HANLIĞI’NA
Authors: ACAR Serkan
Published: June 2023

Tarihî kaynaklarda Ukrayna adına yapılan ilk atıf XII. yüzyıla aittir. Zamanla siyasî bir teşekkülü işaret eden Ukrayna günümüzde en eski Slav devletinin tarihî mirası üzerinde varlığını sürdürmektedir. Başlangıç aşamasında hem Rusların hem de Ukrayinlerin ortak devleti Kiev Knezliği idi. Bu ilk devlet sonradan bölünerek parçalara ayrıldı. XIII. yüzyıl ilk yarısında başlayan Moğol istilası Slav dünyasının neredeyse tamamını etkiledi. Altın Orda döneminin sonlarında Moskova Knezliği’nin yükselmeye başlaması ile birlikte Ruslar tedricen güç kazandılar. Lehistan ve Macaristan ile etkileşim halinde olan Ukrayna ise daha farklı bir gelişim süreci yaşadı. Özellikle Batı Ukrayna sahasında Katolik inancının yaygınlık kazanmasıyla birlikte Rus-Ukrayin ayrışması giderek daha belirgin bir hâl aldı. Ruslar Ukrayna’yı da içine alan büyük bir imparatorluk kurmayı başarsalar da Ukrayin kimliği hiçbir zaman silinmedi. Bu yazıda Ukrayna’nın ortaya çıkışı ve tarihi arka planı ele alınmıştır.
Formation and Development of Scientific Knowledge and Research to the Use of Natural Technologies
Authors: Bryndin Evgeny
Published: June 2023

The human race came from one blood (Acts 17: 26). The abilities of the soul and spirit of each person are laid down by the Creator for research. The human spirit reflects and fixes the qualitative properties of the perceived environment. The human mind cognizes and explores the observed reality. Through linguistic interpretation and functional formalization within the framework of a theory built with the help of axioms and concepts, it captures the results of research. The functional law of thinking Dao, Chinese philosophers proposed as a law of formalization and quantitative representation of the material world as follows: Dao generates 1, 1 generates 2, and so on; The Dao gives rise to plus, minus, multiply, divide, and other functions. Linguistic thinking generates an interpretation of what is happening in the observed reality. Functional thinking is formed and developed within the framework of axiomatic theory. A theory is built on the basis of axioms and concepts. The theory describes the phenomena, processes, essence of the material world and provides an opportunity to conduct research based on its facts and results. When a person focuses his attention on the relevant research, this indicates that he has the knowledge and skills to work in this area, perceiving the living information of nature and the noosphere. Complex formalization and interpretation of the surrounding reality have led to artificial intelligence, which develops new practical results for a person. Interdisciplinary research provides a more holistic view of the Universe. Actual research at the current time is the construction of the theory, detection, identification and use of natural technologies.
Perception, mental health, and social media exposure on adolescents in Indonesia during COVID-19 pandemic
Authors: Nugroho Efa , Nisa Alfiana Ainun , Cahyati Widya Hary , Najib Najib
Published: June 2023

Context: Many adolescents exposed to social media information during the coronavirus pandemic (COVID-19) appeared in Indonesia, especially in Central Java. Aims: To assess adolescent perceptions of COVID-19 and the prevalence of mental health problems and examine their relationship with social media exposure. Methods: This study used a cross-sectional design in adolescents aged between 10-24 years in Central Java province and was conducted from May to June 2020. The snowball sampling technique was used to distribute questionnaires online via WhatsApp. The estimated number of samples who filled out the questionnaire was 1357 respondents. The instruments used in this study were WHO-Five Well-Being Index (WHO-5), Generalized Anxiety Disorder (GAD-7), and a questionnaire developed by researchers using the theoretical framework approach Health Belief Model. Multivariable logistic regression was used to identify the relationship between social media exposure with mental health problems and adolescent perceptions after controlling for covariates. Results: From the results of the study obtained data that were associated with social media exposure in adolescents in Central Java during the pandemic as age (p = 0.0001), education (p = 0.025), and health conditions (p = 0.016). Then social media exposure in adolescents during a pandemic affected perception (p = 0.0001) and stress (p = 0.005) but did not affect depression (p = 0.108). Conclusions: The findings indicated that social media exposure had a significant effect on perception and stress levels. Adolescents who had higher exposure to social media during the pandemic experienced changes in their perception and reported higher levels of stress. However, the study did not find a significant association between social media exposure and depression among adolescents during the pandemic. This suggests that while social media exposure may influence perception and stress, it may not have a direct impact on depression.
OSMANLI’DAN CUMHURİYET’E BİR KURUMUN İŞLEYİŞİ: REJİ İDARESİ ŞARTNAMELERİ (1883-1914)
Authors: DAĞ Mustafa , TANIK İbrahim Halil
Published: June 2023

Osmanlı Devleti’nde kurumsallaşma yolunda ilerleme kat eden alanlardan birisi borçların yönetimiyle ilgilidir. Devlet hem borçların ödenmesi hem de üretimde iç döngünün sağlanmasına önem göstermiştir. Bu anlamda Duyun-u Umumiye ve tütün işletmeleri önemli bir yer tutmuştur. Reji idaresi olarak karşımıza çıkan tütün işletmeleriyle ilgili 19. yüzyılın sonlarına kadar bir düzenlemenin olmaması aynı zamanda devletin artan borç yükü bir kurumsallaşmayı zorunlu kılmıştır. Devlet, 1883 ve 1914 yıllarında tütün işletmeleriyle ilgili iki şartname hazırlayarak uygulamaya koymuştur. Bu çalışma uygulamaya konan iki şartnameyi konu edinmiştir. Şartnamelerin içerikleri merkeze alınarak hem farklılıkları ve benzerlikleri hem de kamu-özel iş birliği bağlamında uyumu incelenmiştir. Çalışmamızın birincil kaynaklarını devlet arşivleri olmak üzere, diğer telif ve tetkik eserler oluşturmaktadır. İncelememiz sonucunda yaklaşık yarım yüzyıl varlık gösteren reji işletmeleri ve onun işleyişini belirleyen şartnamelerde, şirkete önemli bir ayrıcalık tanındığı tespit edilmiştir. Ayrıca devletin dış borçları ödeme uğruna üretici ve tüketici mağduriyetlerinin yaşandığı, yıllık kâr oranlarının yüksek seviyelere ulaşamadığı diğer bulgular arasındadır.
Pengaruh Penerapan Standar Akuntansi Pemerintah Berbasis Akrual, Sistem Pengendalian Internal dan Pengawasan Keuangan Terhadap Kaulitas Laporan Keuangan di SKPD Kabupaten Bantul
Authors: Feni Pirani  , Muhamad Rifandi  , Choirul Anam
Published: June 2023

SKPD Kabupaten Bantul memperoleh opini Wajar Tanpa Pengecualian dari BPK selama 10 tahun berturut-turut dari tahun 2012-2021. Akan tetapi ada beberapa permasalahan yang ditemukan BPK dalam pengelolaan keuangan daerah yaitu pengelolaan izin dan pajak reklame belum tertib, dan pengelolaan piutang daerah belum memadai. Penelitian ini bertujuan untuk mengetahui pengaruh penerapan standar akuntansi pemerintah berbasis akrual, sistem pengendalian internal dan pengawasan keuangan terhadap kualitas laporan keuangan di SKPD Kabupaten Bantul. Penelitian ini menggunakan  pendenkatan kuantitatif dengan menggunakan data primer melalui kuesioner. Metode penelitian yang digunakan adalah metode purposive sampling yang terdiri dari 25 SKPD dengan jumlah responden yang diambil terdiri dari 4 orang setiap SKPD, dengan sampel sebanyak 100 responden. Teknik analisis data yang digunakan yaitu analisis statistika deskriptif, uji validitas, uji reabilitas, uji asumsi klasik, dan uji hipotesis dengan menggunakan alat olah data SPSS versi 26. Hasil penelitian menunjukkan bahwa penerapan standar akuntansi pemerintah berbasis akrual tidak berpengaruh signifikan terhadap kualitas laporan keuangan di SKPD Kabupaten Bantul karena pada uji t nilai signifikan lebih besar dari 0,05 yaitu 0,277, sedangkan sistem pengendalian internal dan pengawasan keuangan berpengaruh signifikan terhadap kualitas laporan keuangan di SKPD Kabupaten Bantul karena pada uji t nilai signifikan lebih kecil dari 0,05 yaitu 0,008 dan 0,000.
THE DEVELOPMENT OF CHOLERA VACCINE PRODUCTION: A LITERATURE REVIEW
Authors: Rahmawaty Adira
Published: June 2023

Introduction. Cholera is a diarrheal disease that causes dehydration and rapid death due to infection with bacterium Vibrio cholerae that develops in the colon. Cholera generally develops in countries with poor sanitation, poverty, and unavailability of clean water such as Africa and South Asian. One of the efforts to prevent cholera transmission to tourists who will visit the country can be conducted through vaccines. Method. This research was made to find out the development of cholera vaccine using the literature search method through PubMed, Elsevier, Google Scholar databases, and credible websites. Result and Analysis. From the results of several literature searches, there is a monovalent O1 serogroup vaccine that contains killed whole-cell bacteria such as Ducoral and live-attenuated bacteria, called Vaxchora. Discussion. In addition, there are bivalent vaccines O1 and O139 serogroups that contain whole-cell killed bacteria such as Shanchol, Euvichol, mORC-Vax, and Cholvax.
"Analytic description of teeth profile of gears with rollers ab and justification of precessional gear parameters selection a"
Authors:   Technical University of Moldova, Bd. Ştefan cel Mare, 168, MD-2004, Chișinău, Republic of Moldova, BOSTAN ION , DULGHERU VALERIU ,   Technical University of Moldova, Bd. Ştefan cel Mare, 168, MD-2004, Chișinău, Republic of Moldova, BOSTAN VIOREL ,   Technical University of Moldova, Bd. Ştefan cel Mare, 168, MD-2004, Chișinău, Republic of Moldova
Published: June 2023

The engineering complex study of the triad “gear-technology-transmission” has permitted to elaborate a new type of mechanical transmission – planetary precessional transmissions with multicouple gear. In this paper, the authors present the mathematic model of the multicouple gear. A computer program for doing this it is also elaborated. It is shown the calculus modalities and some teeth profile diagrams.
Influence of heat release rate on the temperature of the hot gas layer in closed spaces
Authors:   Police Academy, Fire Officers Faculty, Morarilor St., no. 3, sector 2, Bucharest, Romania, TEODOR ALEXANDRA , CHIOJDOIU ALEXANDRU-FLORIN ,   The Inspectorate for Emergency Situations „Dealul Spirii” Bucharest-Ilfov, Calea 13 Septembrie St., no. 135, sector 5, Bucharest, Romania, ANGHEL ION ,   Police Academy, Fire Officers Faculty, Morarilor St., no. 3, sector 2, Bucharest, Romania, PANAITESCU VALERIU NICOLAE ,   "Politehnica University of Bucharest, Splaiul Independenței St., no. 313, sector 6, Bucharest, Romania  "
Published: June 2023

The study used for the elaboration of this article presents the influence of the heat release rate (HRR) on the hot gas layer and temperature development in a specified fire compartment with natural ventilation. The influence of the ventilation factor and the thermal properties of the internal linings (chipboard, gypsum board and expanded polystyrene) are considered as well. Two fire scenarios are taken into account, namely, the compartment has a door opening, respectively a window opening, the heat flow released by fire taking, on the row, the values of 250 kW, respectively 500 kW. Also, it uses the empirical method of McCaffrey, Quintiere and Harkleroad (MQH) to estimate the temperature of the hot gas layer inside the fire compartment.
Autonomous vehicles in mixed traffic: Accounting for human reactions, modelling the Anticipated Safe Distance
Authors:   ", COSTESCU MARIAN DAN ,   FIRST - the Research Institute for Safety in Transportation, Bucharest, Romania University Politehnica of Bucharest, Splaiul Independentei 313, 060042, Romania  "
Published: June 2023

"Aiming to fill the gaps of literature that deals only with the last stage of overtaking, the present papers continues the previous work of the author, that formalised the first stage, Detecting–Need & Types–of-Overtaking and the Trio Overtaking Model (TOM) developed for the third and last stage, the Perform-Overtaking. The Legal, Logic, and Engineering Analyses were employed, firstly to account for human behaviour and reactions within the overtaking model for mixed traffic. Secondly, Anticipated Trio Overtaking Model (A-TOM) is developed from TOM, to calculate the Anticiped-SafeDistance, and asses prior to proceed with any maneouvre (Pre-Check-Overtaking) or anytime during it (Perform-Overtaking), whether the overtaking is safe or not. A-TOM capabilities are reviewed with regard to design simulation, synchronous monitoring and driving control features of the autonomous vehicle Ego, to analyse various scenarios of Accelerating, Flying, Piggy-backing, and 2+ overtaking types. "
Calculation of railway tunnels ventilation
Authors:   ", LAHCHAVA OMAR ,   0186, Mindeli Street 7, G. Tsulukidze Mining Institute, Tbilisi, Georgia 9175, Kostava Street, Georgian Technical University, Tbilisi, Georgia", ILIAS NICOLAE ,   Universitaria Street 20, University of Petroşani, Petroşani, Romania
Published: June 2023

"As a result of aerodynamics calculation the total stream of air flow from piston effect of moving train and effect after movement has been determined ('effect after movement' - The residual movement of air due to the inertia of the moving air mass, when the train has already left the tunnel and the piston effect is no longer directly in effect. So residual motion adds some air stream to the main air flow) in the railway tunnel of the Marabda-Akhalkalaki. It has been determined that for the condition of those tunnels, approximately 2/3 of air flow arisen from piston effect moves in the same direction as the train moves, while the rest flows to the opposite direction into the gap the perimeters of tunnel and train. This causes air turbulence and represents component of the general aerodynamic resistance. Despite of that, all galleries of the mentioned rail highway can be aired with natural draught resulted from piston effect. For the better use of draught, caused by the piston effect ventilation gaps should be arranged in each camera and niche, on both sides of the tunnel. The area of wide section in each air hole should be 5.6 m2. This activity will decrease aerodynamic resistance caused by the airflow in the gap of the tunnel and will guarantee air supply in the tunnel using piston effect. Thermo-physical calculation of tunnels ventilation has been performed and the work project for ventilation has been prepared. The present article sets out the results of the longest tunnel calculation. The presented results may be adjusted to shorter tunnels as well, because corresponding parameters for their conditions are milder and thus, appropriate to the norms. According to the calculation, the heat produced by the moving train can be neutralized with air flow of 4.8 m3/s in winter and 8.4 m3/s in summer. These air flows make sure to satisfy requirements for the maximum temperature so the temperature of airflow coming from the tunnel shall not exceed 35 ° C. 0 for any season. "
Activation of CuAlNi SMAs using a solar energy
Authors:   ", CRISTIAN ION TUDORA ,   University of Pitesti, Romania Institute for Nuclear Research Pitesti, Mioveni, Romania", ABRUDEANU MARIOARA ,   "University of Pitesti, Romania Technical Science Academy of Romania, Bucuresti, Romania", STANCIU SERGIU ,   Technical University “Gheorghe Asachi” of Iasi, Romania, ANGHEL DANIEL CONSTANTIN ,   University of Pitesti, Romania, PLAIASU GABRIELA ADRIANA ,   University of Pitesti, Romania, RIZEA VASILE ,   University of Pitesti, Romania, COTEATA MARGARETA ,   Technical University “Gheorghe Asachi” of Iasi, Romania, DUMITRU MIHAI ,   Technical University “Gheorghe Asachi” of Iasi, Romania, CIMPOESU NICANOR ,   Technical University “Gheorghe Asachi” of Iasi, Romania
Published: June 2023

"Shape memory alloys are special materials that can perform mechanical work during martensitic transformation. CuAlNi shape memory alloys have gained attention based on them high transformation temperatures domain and can be considered as HTSMAs (high temperature shape memory alloys). The thermal component in order to achieve martensitic transformation can be obtained from sun using a solar concentrator. The heating/cooling process was registered and analyzed during the experiments. Material surface was analyzed before and after thermal shocks by microstructure point of view using scanning electron microscopy (SEM VegaTescan LMH II, SE detector) and atomic force microscopy (AFM EasyScan II, non-contact mode). The experiments follow the material behavior during fast heating and propose the possibility of activating smart materials using the sun heat for aerospace applications. "
High voltage DC power distribution: a panoramic view
Authors:   University POLITEHNICA Timişoara, Romȃnia, BOLDEA ION , MUNTEAN NICOLAE ,   University POLITEHNICA Timişoara, Romȃnia, TUTELEA LUCIAN ,   University POLITEHNICA Timişoara, Romȃnia, HULEA DAN ,   University POLITEHNICA Timişoara, Romȃnia
Published: June 2023

"High voltage DC power systems (HVDC) provide essential technical advantages in relation with the AC classical distribution networks: increasing the capacity and the stability in a natural and efficient way, simultaneously with the decoupling of some local disturbances that may occur in their subsystems and the easy interconnection of power AC grids with different parameters. In addition, the increased share of renewable energy sources and the fact that their production takes place in concentrated areas, often away from the consumption areas, require the existence of distribution facilities in the field of GW power levels, with flexible connectivity possibilities. The paper presents general aspects regarding the configuration and the main components of a HVDC power system, implementation in several representative applications. "
"Forecast of the evolution of a pollutant concentration from a groundwater source "
Authors:   Technical Sciences Academy of Romania, 26 Bul. Dacia, 030167 Bucharest, Romania, WOINAROSCHY ALEXANDRU , IORDACHE ALICE ,   "Department of Chemical and Biochemical Engineering, University POLITEHNICA of Bucharest, 1-8 Polizu Str., 011061 Bucharest, Romania "
Published: June 2023

The case study presents the forecast of the concentration of nitrate in drinking water from the Mangalia reservoir. The historical database includes monthly measurements of the respective concentration for the period January 2013 - October 2019. The forecast of the evolution of nitrate concentration was made with a multilayer neural network (MNN) with 16 input neurons, 10 hidden neurons, and 4 output neurons. The neural network was trained using back propagation algorithm with dynamic "window” training data set. The predictions for the year 2019 of the trained network have a maximum error of 21.02%, the average error being 4.89%. The case study shows that the use of MNNs is a promising way for forecasts in the field of drinking water quality management.
Aspects on offshore drilling process in deep and very deep waters
Authors:   University PETROLEUM - GAS of Ploiesti, Faculty of Petroleum and Gas Engineering, Bld. Bucharest, nr. 39, 100680, Ploiesti, Romania, TUDORACHE VALENTIN-PAUL , AVRAM LAZAR ,   University PETROLEUM - GAS of Ploiesti, Faculty of Petroleum and Gas Engineering, Bld. Bucharest, nr. 39, 100680, Ploiesti, Romania, ANTONESCU NICULAE-NAPOLEON ,   University PETROLEUM - GAS of Ploiesti, Faculty of Petroleum and Gas Engineering, Bld. Bucharest, nr. 39, 100680, Ploiesti, Romania
Published: June 2023

"Offshore is a broad concept and therefore in this article offshore refers to drilling wells of oil and gas in the hydrocarbons deposits located deep from the seabed. Oil and gas is drilled wells with help of different offshore structures, for example rigs and vessels. Offshore drilling is a complex process where a borehole is drilled through the seabed. Of course, offshore refers to energy activity located at a distance from the shore. Oil and natural gas is located below the bedrock, which makes it difficult to extract them. A limited amount of inland oil has driven oil industry to the seas to find more oil deposits. There are high financial markets in the offshore industry and that is why much money is being invested in new offshore structures all around the world. Offshore structures are constructed for many different purposes worldwide. The structures are expensive to construct but there is an opportunity to have significant financial profit. "
Viscosity of potassium carbonate solutions promoted by new amines
Authors:   Technical University „Gheorghe Asachi”, Iași, Romania, HARJA MARIA , HULTUANĂ ELISABETA ,   Technical University „Gheorghe Asachi”, Iași, Romania, APOSTOLESCU NICOLAE ,   Technical University „Gheorghe Asachi”, Iași, Romania, APOSTOLESCU GABRIELA ANTOANETA ,   Technical University „Gheorghe Asachi”, Iași, Romania, TĂTARU – FĂRMUȘ RAMONA-ELENA ,   Technical University „Gheorghe Asachi”, Iași, Romania
Published: June 2023

"The objective of this paper is presenting the experimental results of the viscosity measuring for the aqueous solutions of potassium carbonate with new amines as promoters. In this work, ethylenediamine (EDA) and triethylenetetramine (TETA) were chosen as rate promoter candidates. The viscosity of the ternary aqueous solutions (K2CO3-Amine-H2O) has been measured for a blending 25 wt % potassium carbonate, amine concentrations between 1 to 7 wt % for EDA and 1 to 3 % for TETA, at atmospheric pressure and temperatures from 298 K to 343 K."
Critical stresses, deterioration and failure criteria for cracked structures
Authors:   Industrial Process Equipment Department, University POLITEHNICA of Bucharest, Bucharest, 060042, Romania, JINESCU VALERIU V. , NICOLOF VALI-IFIGENIA ,   Technical College „Carol I”, 52nd Porumbacu Str. 060366, Bucharest, Romania, PANAIT IOLANDA CONSTANŢA ,   Industrial Process Equipment Department, University POLITEHNICA of Bucharest, Bucharest, 060042, Romania
Published: June 2023

"Starting from the concept of deterioration, using the principle of critical energy and considering the nonlinear, power law, behavior of the sample, or of the mechanical structure, there were proposed relations for critical stresses in the case of: – uniaxial static loading with normal stress or with shear stress, or simultaneously with normal and shear stress; – uniaxial cyclic loading with one block of normal stress or one block of shear stress, as well as simultaneous with a block of normal stress and one block of shear stress, taking into account the deterioration due to crack. Failure criteria for cracked mechanical structures, uniaxial statically or cyclically loaded, have been developed. The critical stresses calculated for cracked samples compared with experimental results reported in literature, have shown good agreement between them. "
Wind resource assessment system based on time-scale-dependent roughness
Authors:   Department of Geography & Environmental Studies and Department of Environmental Science, Saint Mary’s University, 923 Robie St., Halifax, NS, Canada, SUTEANU CRISTIAN
Published: June 2023

Wind speed intermittence and its forms of pattern change represent sources of significant uncertainties related to wind power. This article introduces a methodological system designed to contribute to an effective assessment of wind resources, by complementing the current wind speed evaluation procedures with the capability of capturing time-scale-dependent pattern properties. The proposed approach to nonstationary wind speed time series produces a comprehensive picture of the wind patterns, in which wind speed variability is quantitatively explored in terms of both time and temporal scale. This approach can thus support responses to the challenges posed by the task of assessing and comparing locations for wind turbines and wind farms, especially in the context of pattern changes in wind resources expected to occur due to climate change.
Technology responsible for sustainable manufacturing
Authors:   National Institute of Research and Development for Electrical Engineering ICPE-CA, 313 Splaiul Unirii, 3, Bucharest, Romania, ALECU GEORGETA , KAPPEL WILHELM ,   "National Institute of Research and Development for Electrical Engineering ICPE-CA, 313 Splaiul Unirii, 3, Bucharest, Romania "
Published: June 2023

"The emergence of the Product Lifecycle Management (PLM) concept, the development and consolidation of its methodological bases, reflects the company's concern to ensure the quality of environmental factors, as well as the obligations of governmental institutions to control the industrial pollution phenomenon. The ""loop closure"" of the product life cycle through recycling and reuse, with both environmental and economic benefits defines the model of a circular economy. The paper presents the opportunity to implement a PLM system, addressing the R & D activities of processes/products/technologies that take place within an RDI entity. "
Testing of hydrodynamic drive of cranes mechanisms
Authors:   ", GRIGOROV OTTO ,   Lifting and Transporting Machines Department, National Technical University “Kharkiv Polytechnic Institute” (NTU ",   ",   KhPI",   ",   ), Kharkiv, Ukraine  ", ANISHCHENKO GALINA ,   Engineering mechanics Department, NTU "KhPI", Kharkiv, Ukraine, PETRENKO NADIIA ,   Lifting and Transporting Machines Department, National Technical University “Kharkiv Polytechnic Institute” (NTU "KhPI"), Kharkiv, Ukraine, STRIZHAK VSEVOLOD ,   Lifting and Transporting Machines Department, National Technical University “Kharkiv Polytechnic Institute” (NTU "KhPI"), Kharkiv, Ukraine, TURCHYN OLHA ,   Lifting and Transporting Machines Department, National Technical University “Kharkiv Polytechnic Institute” (NTU "KhPI"), Kharkiv, Ukraine, STRIZHAK MARJANA ,   Machine Components and Mechatronic Systems Department, NTU "KhPI", Kharkiv, Ukraine, OKUN ANTON ,   Metal forming Department, NTU "KhPI", Kharkiv, Ukraine, RADCHENKO VADYM ,   Lifting and Transporting Machines Department, National Technical University “Kharkiv Polytechnic Institute” (NTU "KhPI"), Kharkiv, Ukraine
Published: June 2023

"The results of researches on the cranes (bridge, tower and portal) with hydrodynamic drives of travel and slewing mechanisms are given. Recommendations for a significant increase hydraulic drives elements limit number of fatigue cycles in relation to a drive with a phase rotor are given. "
Non-propogation crack criteria and fracture criteria in the case of mixed-mode fracture, taking into account the deterioration
Authors:   University Politehnica of Bucharest, Bucharest, Romania, Jinescu Valeriu
Published: June 2023

The paper develops in the case of mixed-mode fracture: criteria of nonpropagation crack and fracture criteria, for mechanical structures, taking into account the deterioration, namely general relations for the superposition of loadings corresponding to the three fracture modes. It refers to the concepts of stress intensity factor, crack tip opening displacement and J-integral; new fracture criteria taking into account the deterioration, the rate of loading and the scattering of the material characteristics were established. The relations obtained have been compared and verified against experimental data and empirical relations reported in literature. The numerical example allows one to comprehend the practical use of the established relations.
Technological risk mitigation for the resilient cities
Authors:   ", OZUNU ALEXANDRU ,   Universitatea Babeș-Bolyai,Facultatea de Știința și Ingineria Mediului, ISUMADECIP,str. Fântânele nr. 30, 400294, Cluj-Napoca, România University of Free State, DIMTEC, Bloemfontein, South Africa", RADOVICI ANDREI ,   Universitatea Babeș-Bolyai,Facultatea de Știința și Ingineria Mediului, ISUMADECIP,str. Fântânele nr. 30, 400294, Cluj-Napoca, România, MEREUȚĂ ALEXANDRU ,   Universitatea Babeș-Bolyai,Facultatea de Știința și Ingineria Mediului, ISUMADECIP,str. Fântânele nr. 30, 400294, Cluj-Napoca, România, PIȘTEA IOANA ,   Universitatea Babeș-Bolyai,Facultatea de Știința și Ingineria Mediului,ISUMADECIP,str. Fântânele nr. 30, 400294, Cluj-Napoca, România, TOROK ZOLTAN ,   Universitatea Babeș-Bolyai,Facultatea de Știința și Ingineria Mediului, ISUMADECIP,str. Fântânele nr. 30, 400294, Cluj-Napoca, România
Published: June 2023

"The complexity of the urban environment causes a continuous change in the different variables of vulnerability: social, economic and environmental protection, energy, health, water, traffic, climate and security- in connection with sustainable development. Multi-hazard and multi-risk assessment for urban areas, in the context of territorial planning policies, is a priority for increasing the resilience of local communities. Vulnerability, as a factor in risk analysis, can influence the likelihood of negative consequences for man, the environment, and infrastructure. A detailed analysis of the vulnerability indicators in the area of industrial hazard sources can improve the correctness of the decisions in the territorial planning process. The paper presents the analysis of the influence of vulnerability, through the presented factors, in the technological risk assessment of major industrial accidents involving hazardous substances. "
Increasing of rolling mill rolls durability in operation. Part I
Authors:   Member (c) of Technical Sciences Academy of Romania, University Politehnica Timisoara, Faculty of Engineering Hunedoara, Revoluţiei 5, Hunedoara, Romania, ILCA IOAN , MILOŞTEAN DANIELA ,   University Politehnica Timisoara, Faculty of Engineering Hunedoara, Romania, BALAZSI ŞTEFAN ,   Industrial Society Siderurgica Hunedoara
Published: June 2023

"By analyzing the situation in the industrial practice, was established that the structure obtained at the rolling mill rolls manufactured in the country according to classical technology does not ensure the necessary hardness and durability in operation. The research carried out in operating conditions ensured the obtaining of structures that would give the rolls hardness as high as possible without diminishing the imposed toughness characteristics (resilience, elongation). From the variants experienced in operation, those with high technological and scientific value were selected, resulting that with the increase of resistance characteristics, the resilience did not decrease, and the exploitation durability doubled compared to the cylinders processed by classical technology. "
"Elements of circular economy in the manufacture of NdFeB permanent magnets IN ICPE-CA "
Authors:   National Institute of Research and Development for Electrical Engineering ICPE-CA, 313 Splaiul Unirii, 3, Bucharest, Romania, ALECU GEORGETA , KAPPEL WILHELM ,   National Institute of Research and Development for Electrical Engineering ICPE-CA, 313 Splaiul Unirii, 3, Bucharest, Romania
Published: June 2023

"In the life cycle of the product, the link between the initial phase and the final stage in its realization is the recycling through the rehabilitation of materials in the production process. This gives circularity to the economy, thus minimizing consumption of natural resources, optimizing manufacturing costs, creating new jobs, developing business. The paper describes in a conclusive example the defining elements of the circular economy. We present this example for the simplicity of our demonstration. This mode allows a direct and edifying treatment of the defining elements of the circular economy. We have chosen as a product the permanent magnets based on rare earths of the NdFeB type. The choice is targeted because NdFeB permanent magnets are expensive products, so the benefits being obvious. We demonstrate the manufacturing of NdFeB permanent magnets with defined magnetic properties from raw materials, their use in products (for ex. in synchronous electric motors) and at the end of the life cycle of motors, the recovery of permanent magnets with the possibility of obtaining the powders used initially in the technological process to manufacture new NdFeB permanent magnets with similar magnetic properties and the possibility of their use in electrotechnical products. Even if, following a piece to piece sorting of the permanent magnets after magnetic parameters of the resulting products would remain scrap, they could be recycled in the same way so that the amount of waste would ultimately be minimal. Finally, we present a recycling technology of NdFeB permanent magnets based on one of our patents filed in 1998. "
Tackling wellbore difficulties for drilling deviated andhorizontal wells
Authors:   Drillling Engineering, Petroleum – Gas University of Ploiesti, Romani, MHANNA AYHAM , HALAFAWI MOHAMED ,   Drillling Engineering, Petroleum – Gas University of Ploiesti, Romani, AVRAM LAZĂR ,   Drillling Engineering, Petroleum – Gas University of Ploiesti, Romani
Published: June 2023

Future development plans are often being continued during production. These plans includes wells repair, reservoir enhancements, or new development wells in order to increase the field production. Therefore, the main objective of this paper is to tackle deviated and horizontal wellbore difficulties in GOF field. Specific drilling hole problems are addressed and reviewed. Additionally, proposed solutions are suggested to improve wellbore stability and select the appropriate hole cleaning drilling practices, based on offset data for drilling the new development wells of Gulf Offshore Field (GOF) without instability difficulties. Overview of this field is discussed including geological column, wells locations, and contour maps. Offset wells data are completely analyzed. Drilling fluids are selected with their properties that avoid wellbore obstructions. Moreover, deviated and horizontal trajectories are optimized for the new development wells. Finally, the best drilling practices are hence recommended
Geotechnical research regarding the use of solid mineral tailings from the mining industry in construction, in the context of circular economy
Authors:   University of Petrosani, Petrosani, Romania, ARAD VICTOR , ILIAŞ NICOLAE ,   University of Petrosani, Petrosani, Romania, ARAD SUSANA ,   University of Petrosani, Petrosani, Romania, TICU MARIAN ,   University of Petrosani, Petrosani, Romania, POPA LIVIU ,   University of Petrosani, Petrosani, Romania, DRAGAN DORIN ,   University of Petrosani, Petrosani, Romania
Published: June 2023

The extractive activity and processing of useful mineral substances results in a significant amount of mining waste, in the form of mineral waste. According to European statistical institutions, mining and quarrying in Europe generates over 50% of total industrial waste. Most of this waste is stored in dumps and ponds. The processing of solid mineral tailings and the production of economically usable by-products is of major importance, both from an economic point of view and from the point of view of environmental management, having a major impact on the protection of the environment. The paper presents the results of research conducted for two areas, namely Deva and Abrud. The geotechnical conditions and the geomechanical characteristics of the tailings as well as of the concretes made from the sterile rocks from the two mining companies were detailed. Based on research, it was found that the mechanical strength of concrete cubes made of sterile material are superior to those made of quarry aggregates.
Stress concentration in the components of a drive coupling
Authors:   Strength of Materials Department, Politehnica University of Bucharest, Splaiul Independenţei 313, Bucharest, 060042, Romania, ATANASIU COSTICĂ , SOROHAN ȘTEFAN ,   Strength of Materials Department, Politehnica University of Bucharest, Splaiul Independenţei 313, Bucharest, 060042, Romania
Published: June 2023

Actuating couplings are used to transmit the torque between the ends of two shafts with or without coaxial deviations. The stress distribution and the stress concentration in a coupling loaded statically by a torque are presented in this paper. The calculation of the stress concentration coefficients in the dynamic stress regime of the machine parts is usually done with relations in whom the stress concentration coefficients in the static regime have a very important weight. For this reason, knowing the values of the stress concentration coefficients in static regime is absolutely necessary. The analysis was made using the finite element method. A calculus methodology is proposed establishing how the loads are applied and how the anti-symmetry of loading is taken into account when boundary conditions are imposed. The influence of the free space between the shaft and the sleeve on the stress field in these two parts is analysed thought the values of the stress concentration coefficient.
BEM simulation on the influence of dispersion currents on buried pipes
Authors:   University Petroleum-Gas of Ploiești, Blvd. Bucharest, no.39, 100680, Ploiești, România, TUDOR ADRIAN IONUȚ , RIPEANU RAZVAN GEORGE ,   University Petroleum-Gas of Ploiești, Blvd. Bucharest, no.39, 100680, Ploiești, România
Published: June 2023

The aim of this paper is to provide a method for modelling the influence of stray currents on buried pipes, using as calculation the boundary element method (BEM), using the module dedicated to corrosion in COMSOL Multiphysics software, which allows investigation both macroscopically and microscopically of corrosion processes. Dispersion currents, often called stray currents, are considered currents that follow little-known trajectories in the ground, but which can affect underground gas pipelines. Their sources are external to the pipes and contribute to the lowering of the anodic potential up to values to which the accelerated anodic dissolution of the metal occurs. For the simulation, the geometric modelling of a soil cube was used, in which pipes of different sizes are inserted, protected or not by a polyethylene protection state, in different positions and different burial depths. Using a calculation algorithm that is based on the boundary element method, the dynamics of the cathodic protection for the buried gas pipes in the presence of stray currents can be modelled.
Technological parameters influence on biodegradable injected polymers during water jet cutting
Authors:   ” Gheorghe Asachi” Technical University of Iasi, Department of Machine Manufacturing Technology, Blvd. Mangeron, No. 59A, 700050, Iasi, Romania, MĂRGUȚĂ DANIEL , HERGHELEGIU EUGEN ,   “Vasile Alecsandri” University of Bacau, Faculty of Engineering, Calea Maraserti 157, 600115, Bacau, Romania, TÂMPU CĂTĂLIN ,   “Vasile Alecsandri” University of Bacau, Faculty of Engineering, Calea Maraserti 157, 600115, Bacau, Romania, MAZURCHEVICI SIMONA-NICOLETA ,   "” Gheorghe Asachi” Technical University of Iasi, Department of Machine Manufacturing Technology, Blvd. Mangeron, No. 59A, 700050, Iasi, Romania ", NEDELCU DUMITRU ,   ” Gheorghe Asachi” Technical University of Iasi, Department of Machine Manufacturing Technology, Blvd. Mangeron, No. 59A, 700050, Iasi, Romania
Published: June 2023

"Arbofill Fichte and Arboblend V2 Nature are polymers with high-performance functional characteristics and which have the potential to replace plastics based on nonrenewable resources from various sectors of activity. The present study aims to analye from topographical point of view the behavior of injected parts during the processing by cutting with abrasive water jet. The materials behavior, as expected, in any machining or manufacturing process is influenced by the technological parameters, whether they are kept constant (for example the part thickness, the abrasive material, the distance between the cutting head and the part) or variable (pressure, traverse speed and abrasive material flow). In this sense, the purpose was to obtain data regarding the most used roughness parameter, Ra, and based on them some solutions for optimizing the working parameters will be provided, so that the surfaces quality to be as good as possible. The results showed that the technological parameter ""abrasive material flow"" has the greatest influence on the roughness, ie lower values of roughness for the situation of using a larger amount of abrasive. "
FEM analysis of Storz coupling
Authors:   ”Dunărea de Jos” University of Galati, Faculty of Science and Environment, 47 Domnească Street, RO-800008, Galati, Romania, OJOC GEORGE GHIOCEL , BĂBUȚ CORNEL ,   Technical University Cluj-Napoca, Romania, UNGUREANU NICOLAE ,   Technical University Cluj-Napoca, Romania, DELEANU LORENA ,   ”Dunărea de Jos” University of Galati, Faculty of Science and Environment, 47 Domnească Street, RO-800008, Galati, Romania
Published: June 2023

This paper presents an isothermal model of Storz coupling used in fire hose coupling. The model has the actual geometry of the coupling Fire and Rescue NSW for the nominal diameter of 65 mm (NEN 3374). The simulation was done for a load interval on the coupling (from F=2 kN for an actual value of water pressure, to extreme conditions with F=3 kN and 6 kN when the coupling fails under load). The stress and strain distributions point out the stress concentrators and the maximum values of von Mises stress in order to compare them to the material limit. The coupling is made of aluminum alloy EN AW6082 (AlSi1MgMn), treatment T6 (solution heat treated, quenched and artificially aged). Bottom surface of one half-coupling is fixed and the upper surface of the other half-coupling is loaded with a tensile force, uniformly distributed on surface. The constitutive model of the material is bilinear with Young modulus of 71000 MPa, Poisson ration 0.33, yield limit of 280 MPa, ultimate tensile strength 310 MPa and plastic equivalent strain 0.14.
The PbO concentration influence on oxides films developed on Incoloy 800 in CANDU secondary circuit conditions
Authors:   Institute for Nuclear Research, Campului no.1, Mioveni, POB 78, Arges, Romania, SAMARINEANU CLAUDIA , LUCAN DUMITRA ,   "Institute for Nuclear Research, Campului no.1, Mioveni, POB 78, Arges, Romania Technical Sciences Academy of Romania ASTR, Dacia Avenue no.26, Bucharest, Romania", TUDORACHE GABRIELA ,   Institute for Nuclear Research, Campului no.1, Mioveni, POB 78, Arges, Romania
Published: June 2023

"The presence of lead compounds in CANDU secondary water circuit contributes to the degradation of nickel alloys involved in critical equipments manufacturing, e.g. steam generator. The pre-oxidated Incoloy 800 specimens (the steam generator tubes material) have been tested in autoclave, in secondary simulated water medium conditions: pH=9.5, at 5.1 MPa presssure and 2600C temperature, in solutions containing 100, 200 and 300 mg/L PbO, the exposure time for each concentration being 10, 20 and 30 days. The specimens evaluation after testing have been realised through ex-situ and in-situ methods: metalography, electrochemistry (potentiodynamic and impedance), gravimetry and scanning electron microscopy with energy dispersive spectroscopy. It is investigated the influence of different PbO concentrations on tested specimens surface morphology (grain, layer thickness, layer composition) and on the corrosion susceptibility, resulting in increased corrosion tendency and loss of protective properties of films as the PbO concentration was higher."