bluuebunny/crossref_metadata_2025_split huggingface dataset:
Replacement of the natural gypsum stone in the production of cement with industrial wastes
Authors: Лобачевский В.И. , Губская А.Г. , Письменский П.И. 
Published: December 2023

Статья посвящена актуальной проблеме переработки фосфогипса — одного из их видов многотоннажных техногенных отходов, образующегося на предприятии ОАО «Гомельский химический завод». Авторы приводят результаты исследований получения искусственного гипсового камня путем нейтрализации разновидностей фосфогипса: фосфополугидрата сульфата кальция ( отхода производства экстракционной фосфорной кислоты полугидратным способом) и фосфодигидрата сульфата кальция (отхода ее производства дигидратным способом). На основе экспериментальных данных установлена возможность замены импортируемого в Республику Беларусь природного гипсового камня искусственным при производстве цемента на основе клинкеров белорусских цементных заводов и его влияния на гидратацию клинкерных минералов.
The article is focused on the current problem of recycling phosphogypsum, one of the many types of industrial wastes generated in large amounts at OAO Gomel Chemical Plant. The authors present the results of studies of artificial gypsum rock production by neutralizing various types of phosphogypsum: calcium sulfate hemihydrate contaminated with phosphorus (a waste product of phosphoric acid extraction by hemihydrate method) and phosphorus-contaminated calcium sulfate dihydrate (a waste product of its production by dihydrate method). The experimental data confirmed the possibility of replacing the natural gypsum rock imported to the Republic of Belarus for the production of cement based on clinkers of Belarusian cement plants with the synthetic one and its effect on the hydration of clinker minerals.
Mineralizer input temperature as a factor in obtaining white clinker with a high iron oxide content
Authors:  Мишин Д.А. ,  Ковалев С.В. 
Published: December 2023

Настоящая работа посвящена влиянию нового способа ввода минерализатора 2C2S · CaF2 на белизну цемента при различных концентрациях оксида железа в клинкере. Установлено, что оптимальный температурный интервал ввода минерализатора при обжиге — 1000—1100 °C. Белизна измельченного клинкера составила 83 % при содержании оксида железа в клинкере 0,7 % масс. Это позволит расширить сырьевую базу получения белого цемента. Новый способ ввода минерализатора дает возможность снизить температуру получения белого клинкера на 200—300 °C. Синтез белого клинкера в этой работе проводили при 1300 °C.
The present work is devoted to the influence of a new way of input of mineralizer 2C2S - CaF2 on whiteness of cement at different concentrations of iron oxide in the clinker. It was established that the optimum temperature interval for the introduction of the mineralizer during burning is 1000-1100 °C. The whiteness of the ground clinker was 83 % with iron oxide content in clinker of 0.7 wt.%. This will expand the raw material base for the production of white cement. The new method of introducing a mineralizer makes it possible to reduce the temperature of white clinker production by 200-300 °C. The synthesis of white clinker in this work was carried out at 1300 °C.
Variability in cement properties – influence on bleeding of cement paste
Authors: Янцарикова Д. , Хела Р. , Нецвет В. , Перина Т. 
Published: December 2023

Цель данного исследования — установить связь между свойствами цемента и водоотделением цементного теста. Было испытано 19 образцов цемента, отобранных из разных партий: исследовали гранулометрию, удельную поверхность, проч ность, содержание щелочей, содержание модификаций С3А, сроки схватывания и водоотделение. Склонность к водоотделению определяли для всех образцов цемента на трех видах цементного теста: контрольного состава и двух составов с суперпластификаторами разных производителей. Результаты указывают на некоторую связь между удельной поверхностью и тенденцией к водоотделению. Чем ниже удельная поверхность, тем выше склонность к выделению воды. При этом содержание щелочей, по­видимому, оказывает небольшое влияние (более высокое содержание щелочей способствует водоотделению). Полученные результаты не являются окончательными; требуется дальнейшее исследование различных факторов, таких как содержание серы и вид гипса, добавляемого при помоле клинкера.
The aim of this study is to find relation between cement properties and tendency of cement paste (concrete) to bleeding. We tested 19 cement samples collected from different batches. On cements were tested granulometry, specific surface, strengths, alkali content, content of C3A modifications, setting times and bleeding. Tendency to bleeding of all 19 samples was tested in 3 types of cement paste mixtures. One reference mix and two mixtures with superplasticizers from different producers. Results show, that we can see partly relation between specific surface area and tendency to bleeding. With lower specific surface area, the tendency to bleeding is higher. While the content of alkali seems to have small influence. Where the higher content of alkali means higher tendency to bleeding. On the other hand, these results are not conclusive and it is required further testing on different parameters such as content of sulphur and type of gypsum added to clinker during grinding.
პროექტზე დაფუძნებული სწავლების-როლი უმაღლესი განათლების მიზნების მიღწევაში
Authors: დარბაიძე მარიამ , მუშკუდიანი ზურაბ , გელაშვილი ინგა , თაბაგარი ხათუნა 
Published: December 2023

უმაღლესი განათლების შესახებ საქართველოს კანონის მიხედვით, უნივერსიტეტის დასრულების შემდეგ, სტუდენტმა შეძენილი ცოდნითა და უნარებით უნდა შეძლოს საზოგადოებაში ღირსეული ადგილის დამკვიდრება და საკუთარი შესაძლებლობებისგანვითარება. ეს კი გულისხმობს ისეთი სისტემური ცოდნის მიღებას, რომელიც მუდმივი ზრდა-განახლების უნარით ხასიათდება.
სტატიის მიზანია შეისწავლოს პროექტზე დაფუძნებული სწავლება, როგორც სტუდენტზე ორიენტირებული სწავლების ეფექტური მიდგომა და მისი როლი უმაღლესი განათლების მიზნების მიღწევაში, გამოავლინოს ლექტორები რამდენად იყენებენ სწავლების თანამედროვე მეთოდებს, როგორია ეფექტურობა, გამოწვევები და მათი გადაწყვეტის გზები.წინამდებარე სტატიაში გამოყენებულია კვლევის მეთოდები: უმაღლეს სასწავლებლებში ჩატარებული გამოკითხვა კითხვა-პასუხის რეჟიმში და რაოდენობრივი და თვისებრივი კვლევის მეთოდები.კვლევის შედეგების მიხედვით ვლინდება, რომ აღნიშნული საგანმანათლებლო მიზანი ჯერ კიდევ მიუღწეველია უმაღლესი სასწავლებლებისათვის. სასწავლო პროცესზე დაკვირვებამ ცხადყო, რომ ლექტორები ან საერთოდ ვერ, ან ნაწილობრივ ახერხებენ სწავლების თანამედროვე მეთოდების გამოყენებას. ამასთან ერთად, ისინი ვერ უზრუნველყოფენ სტუდენტზე ორიენტირებული სასწავლო პროცესის ხელშეწყობას. ამ პრობლემის რამდენიმე მიზეზი შეიძლება არსებობდეს, თუმცა ერთ-ერთი მათგანია არასწორი სასწავლო მეთოდების შერჩევა და გამოყენება.
The regional competitiveness: perspective on national resilience
Authors: Razi Fachrul , Josias Simon Arthur , Rivai Ras Abdul , Abdul Samad Iskandar 
Published: December 2023

A law of regional competitiveness has become important for a country. This issue is one of the eight important elements in national defense. This qualitative research applies focus group discussion and employ 21 participants to gather data. The result shows that the law that regulates the competitiveness is important to increase the life quality of the people.
Participation of Women in Medical Education Program in India
Authors: Nandi Ankur , Bala Arabinda , Das Tapash , Halder Tarini 
Published: December 2023

Women are 50% of humanity. Medicine is a particularly important occupation for women to enter. Women have always played a pivotal role in the health sector from health of the family to the health of the nation. Historically, women have also been the primary health care providers and health decision-makers for their families. Nearly two-thirds of women polled in a recent national survey indicated that they alone were responsible for health care decisions within their family. Women have played a significant role in their communities as doctors, nurses, midwives, patient advocates, and public health experts. In medical education only, the participation of men is not enough, women's participation is equally important. Because inclusion of women medicine in for women in medical science is fundamental to address emerging gender gaps in medical science. This study aims to examine the position of women in different medical education programs in India through the Annual Report of the All-India Survey on Higher Education (AISHE) Department of Higher Education, Ministry of Education, Government of India, from 2013-14 to 2019-2020. This study was qualitative and documentary in nature. Results showed that women enrolled more in B.Sc. nursing and lesser recruitment in postgraduate courses. The study concludes that the participation of women in medical education plays a vital role. The study suggests remedial measures to overcome constraints faced by females in pursuing medical education.
Three‐Component 1,4‐Addition through Ugi‐Type Reaction, an Oxidative Dearomatization Strategy
Authors: Chen Zhihao , Liu Yuqing , Gao Xing , Sun Yuanyuan , Lei Lingyu , Zhao Xia , Lu Kui 
Published: December 2023

AbstractA three‐component 1,4‐addition variant of the Ugi reaction involving carboxylic acids, isocyanides, and cyclic α,β‐unsaturated imines is presented in this study. The cyclic α,β‐unsaturated imines were conveniently prepared through the oxidative dearomatization of N‐substituted anilines. The reaction proceeded successfully to produce a sole diastereomer, and the relative configuration was determined through 2D NMR and X‐ray diffraction analysis.
Discovery and Development of Cyclic Peptide Proteasome Stimulators
Authors: Nelson Samantha , Harris Timothy J. , Muli Christine S. , Maresh Marianne E. , Baker Braden , Smith Chloe , Neumann Chris , Trader Darci J. , Parkinson Elizabeth I. 
Published: December 2023

AbstractThe proteasome degrades proteins, which is essential for cellular homeostasis. Ubiquitin independent proteolysis degrades highly disordered and misfolded proteins. A decline of proteasomal activity has been associated with multiple neurodegenerative diseases due to the accumulation of misfolded proteins. In this work, cyclic peptide proteasome stimulators (CyPPSs) that enhance the clearance of misfolded proteins were discovered. In the initial screen of predicted natural products (pNPs), several cyclic peptides were found to stimulate the 20S core particle (20S CP). Development of a robust structural activity relationship led to the identification of potent, cell permeable CyPPSs. In vitro assays revealed that CyPPSs stimulate degradation of highly disordered and misfolded proteins without affecting ordered proteins. Furthermore, using a novel flow‐based assay for proteasome activity, several CyPPSs were found to stimulate the 20S CP in cellulo. Overall, this work describes the development of CyPPSs as chemical tools capable of stimulating the proteasome and provides strong support for proteasome stimulation as a therapeutic strategy for neurodegenerative diseases.
Effect of Sulfotyrosine and Negatively Charged Amino Acid of Leech‐Derived Peptides on Binding and Inhibitory Activity Against Thrombin
Authors: Chen Tzu‐Yin , Shyur Eileen , Ma Tzu‐Hsuan , Wijeyewickrema Lakshmi , Lin Sheng‐Wei , Kao Mu‐Rong , Liang Pi‐Hui , Shie Jiun‐Jie , Chuang Er‐Yuan , Liou Jing‐Ping , Hsieh Yves S. Y. 
Published: December 2023

AbstractHirudins, natural sulfo(glyco)proteins, are clinical anticoagulants that directly inhibit thrombin, a key coagulation factor. Their potent thrombin inhibition primarily results from antagonistic interactions with both the catalytic and non‐catalytic sites of thrombin. Hirudins often feature sulfate moieties on Tyr residues in their anionic C‐terminus region, enabling strong interactions with thrombin exosite‐I and effectively blocking its engagement with fibrinogen. Although sulfotyrosines have been identified in various hirudin variants, the precise relationship between sulfotyrosine and the number of negatively charged amino acids within the anionic‐rich C‐terminus peptide domain for the binding of thrombin has remained elusive. By using Fmoc‐SPPS, hirudin dodecapeptides homologous to the C‐terminus of hirudin variants from various leech species were successfully synthesized, and the effect of sulfotyrosine and the number of negatively charged amino acids on hirudin‐thrombin interactions was investigated. Our findings did not reveal any synergistic effect between an increasing number of sulfotyrosines or negatively charged amino acids and their inhibitory activity on thrombin or fibrinolysis in the assays, despite a higher binding level toward thrombin in the sulfated dodecapeptide Hnip_Hirudin was observed in SPR analysis.
Der Einfluss von Zusatzmitteln auf das Recycling von calciumsulfatbasierten Bindemitteln Teil I (Ausgangsstoff gezüchtete Kristalle)
Authors: Pritzel Christian , Zeitoun Edrees Abu , Trettin Reinhard , Killian Manuela S. 
Published: December 2023

KurzfassungDurch die Energiewende in Deutschland werden die verschiedenen Kraftwerksnebenprodukte, unter anderem REA‐Gips, mehr und mehr verschwinden. Aus diesem Grunde rückt das Recycling von Gips zunehmend in den Fokus der Wissenschaft. Bisher wurde der Einfluss von Additiven auf das Recycling von Gips nur begrenzt untersucht. Mit den vorgestellten Untersuchungen soll ein Beitrag zu dieser Diskussion geliefert werden. Dazu wurden Gipskristalle auch in Anwesenheit von Additiven per Diffusionsynthese aus Natriumsulfat und Calciumchlorid hergestellt. Diese wurden anschließend zu Halbhydrat umgesetzt und dieses wieder hydratisiert. Beide Vorgänge wurden mit verschiedenen Methoden untersucht. Mit Hilfe der Elektronenmikroskopie konnten die Morphologien sowohl der Gipskristalle als auch des gebildeten Halbhydrates bestimmt werden. Die Wärmeflusskalorimetrie hat dazu beigetragen den Hydratationsverlauf des Halbhydrates zu verfolgen. Es konnte gezeigt werden, dass einige Additive im System verbleiben und im Recyclingprodukt zu neuen Herausforderungen führen können.
Resting time effect on the rheological behaviour of glass beads and cement suspension: The role of PCE size and ionic strength
Authors: Ji Yanliang , Mezhov Alexander , Becker Simon , von Klitzing Regine , Wolfram Schmidt , Stephan Dietmar 
Published: December 2023

AbstractStudies have shown that in an aqueous suspension of inert glass beads, the yield stress is increased as a function of resting time. This study investigates this unexpected phenomenon, focusing on solid surface potentials, PCE size in ionic solutions, and their possible relations to rheological behaviour with resting time. Results indicated that PCE in artificial pore solution will result in a higher yield stress with time. PCE with lower anionic charges and molecular weight can significantly increase the yield stress after 2 h of resting. The absolute value of the zeta potential grows to a certain degree after resting phase. Dynamic light scattering (DLS) results showed that the size of PCE molecules in ionic solutions increases over time, suggesting an enhanced depletion force or bridging force among glass bead particles, which could be the reasons for the increase in yield stress over time. Furthermore, the possible impacts of the depletion force or bridging force resulting from the PCE size change on the rheological properties of cement suspension are discussed.
Multiphase granular suspension flow of fresh concrete during pumping in complex geometries
Authors: Mikhalev Daniil , Kluwe Moritz Niklas , Schwarze Rüdiger , Mechtcherine Viktor 
Published: December 2023

AbstractDuring the pumping process of multiphase granular suspensions, such as concrete, through pipe systems, many parameters can influence the material's ability to flow. To understand the hydrodynamics and particle mechanics in granular, non‐Newtonian suspensions under nonlinear flow conditions, the authors have been working on a joint project within the Priority Program SPP 2005 “Opus Fluidum Futurum ‐ Rheology of Reactive, Multiscale, Multiphase Construction Materials” funded by the German Research Foundation (DFG). Based on the results obtained, it is possible to describe the relationships between concrete composition and the rheological properties of the fresh mixture for pumping applications. The effects of particle geometry and flow conditions on flow‐induced particle migration (FIPM), subsequently the formation of a lubricating layer (LL), and eventually on pumping pressure were also shown. While the behavior of concrete and other complex, multiscale suspensions in generic flows (Couette, Poiseuille) is still part of current research and only partially understood, the behavior in complex geometries is even less explored so far. Here, additional effects based on the curvature of streamlines and mass inertia of the particle phase come into play. In the framework of the project, these effects have been investigated experimentally and numerically. Various experimental approaches have been developed to observe the behavior of particles within their carrier fluid in an opaque, dense, and enclosed moving system, yielding insightful results. Currently, models are being developed and experimentally validated to describe particle migration quantitatively, allowing conclusions about the local rheological behavior to be drawn. This information is essential to predict the flow behavior necessary for modern processes such as 3D printing and energy‐optimized pumping.
Tool developments for additive manufacturing processes with anchor for the modern flow production
Authors: Lindner Marco , Gliniorz Ralf , Männel Mike , Garbe Daniel , Funke Henrik , Gelbrich Sandra , Berger Maik 
Published: December 2023

AbstractIn modern flow production, the focus is on the continuous digitally controlled tools within the context of the digital twin. Spray extrusion, especially in combination with a thin layer of shotcrete and ribbed supporting structures, for example for facade elements, leads to very efficient components with high load‐bearing capacity and high quality surfaces. The developed combined spray extrusion nozzle offers the possibility of both: spraying and extruding, adapting mortar and concrete. In addition, automated integration of anchors is the focus of flow production, for which anchors and tooling systems have been developed. Based on the determination of characteristic values, the practicability and the increase in productivity could and will be proven. This data forms the basis of a digital twin in preparation for Industry 4.0. This increase in productivity in additive manufacturing leads to positive economic effects, applications of high strength lightweight structures in construction are becoming more attractive and enable the series implementation of free form modular constructions.
Clinker‐efficient cements and their application ‐ today and tomorrow
Authors: Müller Christoph 
Published: December 2023

AbstractThe concrete standard DIN 1045‐2 currently provides fixed limit formulations for the respective exposure class. The tests of cements in concrete with regard to durability (carbonation, chloride penetration, frost and freeze‐thaw salt resistance) are now carried out within approvals procedures in a limit composition for the exposure class under consideration. Test results of clinker‐efficient cements are shown against the assessment background of the German Institute for Building Technology (DIBt) e. g. for carbonation: This test is currently to be carried out with a water‐cement ratio of w/c = 0.50. While, for example, a CEM III/A or a CEM II/C‐M (S‐LL) fit well into the assessment background in this test with the required limit composition, the depth of carbonation of a cement is 20 percent clinker, 30 percent blast furnace slag and 50 percent unburned limestone clearly outside. If the water‐cement ratio is reduced to w/c = 0.40, the result is already in the upper range of the evaluation background. A further reduction to w/c = 0.35 leads to a result in the range of the reference cements. A further significant reduction in the clinker content in cements with a high proportion of unburnt limestone would therefore be possible if the concretes are composed accordingly.
Entwicklung eines alkalisch aktivierten Bindemittels für das Extrusionsverfahren
Authors: Kruppa Henning , Kalthoff Matthias , Vollpracht Anya , Matschei Thomas 
Published: December 2023

KurzfassungEin Hauptfokus der derzeitigen Forschung im Bauwesen liegt in der Untersuchung und Entwicklung von nachhaltigen Herstellungsmethoden und Baumaterialen. Ein hohes Potential weisen neue Fertigungsmethoden wie die Extrusion von Textilbeton auf, da somit leichte und lastpfadgerechete Bauteile hergestellt werden können. Allerdings werden hierbei derzeit häufig Betone mit hohen Bindemittelanteilen und CO2‐Fußabdruck verwendet. Eine nachhaltige Alternative zu dem konventionellen Betonen stellen alkalisch aktivierte Materialen (AAM) dar. Die chemische Zusammensetzung, Reaktivität und das rheologische Verhalten unterscheiden sich jedoch meist stark von zementbasierten Systemen, wodurch ein hoher Forschungsbedarf besteht. Im Rahmen dieser Arbeit wurde ein innovatives AAM unter Verwendung von Basalt‐ und Hüttensandmehl synthetisiert. Für eine genauere Charakterisierung des AAM wurden der Erstarrungszeitpunkt und die Wärmeentwicklung mit einem isothermen Wärmeflusskalorimeter für unterschiedliche Bindemittelzusammensetzungen untersucht. Die Eignung als Bindemittel für die Extrusion wurde ebenfalls systematisch getestet. Um eine fehlerfreie Extrusion zu gewährleisten, muss der Frischbeton im Extruder förderbar sein und eine hohe Grünstandsfestigkeit aufweisen, so dass eine maßhaltige, fehlstellen‐ und schalungsfreie Herstellung der Bauteile gewährleistet ist. Für die rheologische Beschreibung der neu entwickelten AAM für den Extrusionsprozess wurde ein innovativer Kugelpenetrationstest eingesetzt, mit dem die Extrudierbarkeit vorhergesagt werden konnte.Die Ergebnisse zeigen, dass die AAM zielsicher für den Extrusionsprozess entwickelt und die Eignung vor den eigentlichen Prozess vorhergesagt werden können. Zusätzlich konnte gezeigt werden, dass AAM aus industriellen Nebenprodukten für diesen Prozess geeignet sind und dadurch der CO2‐Ausstoß minimiert werden kann.
Crack Resistance of Concrete Using Granulated BlastFurnace Slag Sand under Flexural Stress
Authors: Hashimoto Ryota , Onoue Kozo 
Published: December 2023

AbstractGranulated blast‐furnace slag sand (BFS) has the potential to be used as an alternative to fine aggregates in concrete production. The interface between the cement paste and the aggregate in concrete is densified when BFS is used, due to the hydrates that are generated by its latent hydraulicity. This fact suggests that the crack resistance of concrete, which is closely related to the conditions at the aggregate interface, would be enhanced by the use of BFS. The fracture energy (GF) of concrete under flexural stress is here measured to evaluate the crack resistance of concrete made using BFS. BFS samples from three different steel mills in Japan are used as the fine aggregates for concrete production, and mountain sand is used as a natural sand for comparison. Compressive strength, static modulus of elasticity, and fracture energy tests are conducted at the material ages of 28 and 91 days. The GF of the BFS concretes increase with increasing compressive strength; on the other hand, the GF of the concrete made using mountain sand decrease. Thus, it is concluded that BFS concrete has superior properties to concrete made using natural sand in terms of the crack resistance under flexural stress, especially in high‐strength regions for large material ages.