bluuebunny/crossref_metadata_2025 huggingface dataset:
Changes in agrochemical properties of meadow chernozem-like soil under prolonged exposure to agrogenic factors in grain-soybean crop rotation
Authors: Sinegovskaya V. T. , Naumchenko E. T. , Banetskaya E. V.
Published: December 2024

In a long-term stationary experiment to study the fertilizer system in crop rotation, established in 1962–1964 on meadow chernozem-like soil in the southern natural and climatic zone of the Amur region, the influence of prolonged use of mineral and organo-mineral fertilizer systems on the agrochemical properties of meadow chernozem-like soil in relation to the level of crop yield in crop rotation was studied. The use of mineral fertilizers alone and together with organic ones provided an increase in the content of mobile phosphorus in the soil by 2.0–2.5 times, its mobility by 2.9–3.5 times relative to control. The long-term use of the organo-mineral fertilizer system led to an increase in the humus content by 0.69% and the preservation of acidity indicators at the initial level, while the application of only mineral fertilizers increased the hydrolytic and metabolic acidity. Wheat yield when applying N30 against the background of prolonged application of fertilizers to the 12th rotation of the crop rotation increased by 0.58 t/ha relative to the control, with its aftereffect – by 0.30 t/ha. At the same time, the yield of soybeans was 2.42–2.62 t/ha. It was found that the productivity of crop rotation was determined by 73% by changes in humus content, soil acid content and mobile P2O5 content in the 0–20 cm soil layer. The relationship of crop rotation productivity with humus content was weak (β = 0.26), hydrolytic acidity – medium reverse (β = –0.57), metabolic acidity – strong reverse (β = –0.81) and phosphorus content – strong (β = 0.84). The values of p-levels and Student coefficients indicated the fact that hydrolytic and metabolic acidity, the content of mobile phosphorus were statistically significant variables.
Insecticidal compositions of natural pyrethrins and substituted benzodioxolanes from vegetable oils
Authors: Mukovoz P. P. , Alexandrov R. I. , Semenov V. L. , Peshkov S. A. , Sizentsov A. N. , Valiullin L. R. , Mukovoz V. P. , Ptitsyna N. V. , Meshkov Yu. I.
Published: December 2024

In order to confirm the theoretical calculations of the validity of the use of natural pyrethrins together with the components of vegetable oils, biologically active compositions of insecticides isolated from Dalmatian chamomile (Pyrethrum cinerariaefolium) and synergistic substances obtained from sesame, kanang and anise oils have been developed. It was found that insecticidal compositions showed their effectiveness against model insect pests (greenhouse whitefly – Trialeurodes vaporariorum). It is shown that the developed compositions can be used as a promising basis for the creation of new means of protecting agricultural plants from insect pests.
Carbon sequestration by ecosystems of cold territories of Transbaikalia
Authors: Chimitdorzhieva G. D. , Chimitdorzhieva E. O. , Milkheev E. Y. , Tsybenov Yu. B. , Korsunova Ts. D.
Published: December 2024

In the Baikal region, the continuous cryolithozone occupies ≈15, the transitional intermittent zone with Talikov islands – 30, the transitional island zone – 45, taliki with a continuous area – 10%. Attention is drawn to the dominance of the transition band, which is characterized by unstable thermodynamic equilibrium. High-temperature permafrost is easily degraded by technoconversion of external heat exchange conditions: removal of ground covers (organogenic layer and snow cover), deforestation, plowing, fires, etc. These circumstances increase the natural hazards and risks in the region. In this regard, the territory of Transbaikalia is of great interest, being in the permafrost zone and near its southern border, on the one hand, and with increased warming rates in recent decades, on the other. The continentality and severity of the climate in Buryatia are much more pronounced than in neighboring single-latitude regions of Russia. The southern boundary of the cryolithozone stretches almost throughout the entire territory of the republic, within which a whole range of landscapes is distinguished – from automorphic forest ecosystems to widespread, due to the high proportion of lakes and swamps, hydromorphic landscapes formed under the active influence of permafrost, as well as dry-steppe. The implementation of the Kyoto Protocol on Stabilization of Greenhouse Gas (GHG) Concentrations in the Atmosphere requires a quantitative assessment of spatiotemporal changes in terrestrial carbon sinks. Identifying areas with high potential and strategies for managing sequestration of atmospheric carbon dioxide by ecosystems is an important task and there is great uncertainty about the actual estimates of carbon reservoirs and how they may be affected by climate change. In the current conditions, we consider the study of the patterns of functioning of the soil and plant carbon reservoir in Transbaikalia to be timely and relevant.
Effect of oil and diesel fuel pollution on enzymatic activity of meadow chernozem-like soil
Authors: Piletskaya O. A.
Published: December 2024

In the laboratory experiment, the effect of oil pollution on the short-term dynamics of the activity of urease, phosphatase, catalase, peroxidase and polyphenol oxidase of the chernozem soil of the south of the Far East was studied. It was found that when soil was contaminated with oil and petroleum products, urease activity decreased by 20–44% at the end of incubation, peroxidase activity increased by 39–49% in the middle and end of incubation, polyphenol oxidase activity increased 1.6–2.0 times in the middle of incubation. The activity of phosphatase and catalase was stable at different levels of contamination throughout the experiment. Examining the effect of the incubation period, it was found that the maximum activity of urease was on the 10th day, phosphatase – on the 20th, peroxidase – on the 20th and 30th, polyphenol oxidase – on the 30th day of the experiment. Catalase activity was stable throughout all incubation periods. It was shown that in the case of contamination of chernozem-like soil with oil and diesel fuel in doses up to 5000 mg/kg, inhibition of enzymatic activity did not occur in the early stages.
In vitro screening of potential echinochrome delivery systems for the treatment of eye diseases
Authors: Alexander-Sinklair E. I. , Aleksandrova S. A. , Darvish D. M. , Edomenko N. V. , Gorbach V. I. , Yermak I. M. , Mikhailova N. A. , Blinova M. I.
Published: December 2024

An important task of topical application of medicines in the treatment of eyes is to achieve a compromise between their effectiveness and safety. The development of new multifunctional local ophthalmic drug delivery systems and in vitro screening of potential medicinal eye products are key areas in solving this problem. In this study, primary in vitro screening of the effect of echinochrome (Ech), the carrageenan complex of echinochrome (CRG/Ech) and its liposomal form (CRG/Ech-Lip) was performed on cultured epithelial cells of the outer shell of the eyeball: conjunctival epithelial cells (Chang Conjunctiva, Clone 1-5c-4) and corneal epithelium human (HCE). The cell viability was assessed by their morphology and metabolic activity using light microscopy and MTT test methods. The direct dependence of the intensity of the cytotoxic effect of Ech on its concentration in the nutrient medium, the form of use, the cellular test system and the incubation time of cells was revealed. Ech in the form of an alcoholic solution in its final concentration of 0.1 mg/ml of the nutrient medium exhibits pronounced cytoxicity against both cellular test systems. The same final concentration of Ech in the nutrient medium, but already as part of the carrageenan complex of echinochrome (CRG/Ech), turned out to be critical only for the viability of corneal epithelial cells, the survival rate of conjunctival cells under these conditions was about 50 %. A high biocompatibility of the liposomal form of the carrageenan complex of echinochrome (CRG/Ech-Lip) with cells of both test systems and a stimulating cytoprotective effect against the cells of the conjunctiva epithelium was revealed.
Structure and Morphogenetic Properties of Collagen Matrixes Obtained from Connective Tissue Sheaths of Paravertebral Tendons
Authors: Gaidash А. А. , Kulak A. I. , Krut’ko V. K. , Blinova M. I. , Musskaya O. N. , Aleksandrova S. A. , Skrotskaya K. V. , Kulchitsky V. A.
Published: December 2024

The morphogenetic properties of a collagen gel prepared by acetic acid extraction from the tendon sheaths (peritenons) of the paravertebral tendons of Wistar rats were studied. The gel was used as a substrate during in vitro cultivation together with mesenchymal stromal cells for 14 days in the growth and osteogenic incubation media. It has been established that the collagen framework of the peritenon substrate is strengthened by increasing the connectivity of fibrillar nodes and is structured with the formation of lamellar and tangle formations. Sesamoid globules, penetrating into the substrate from the initial peritenon gel, during cultivation remain inert in the growth medium, but exhibit an increased ability to structure calcium phosphates in the osteogenic medium. The formation of cell-mediated structures occurs by directions of fibro-, tendo-, ligament- and osteogenic differentiation. The fibrogenic direction provides a structuring framework; the tenogenic direction – the formation of embryonic tendons according to the mechanism of lateral assembly of collagen subfibrils on cell surfaces and their autonomization in the form of tendon filament primordia; the ligamentogenic direction – structuring of collagen ribbons associated with tangles and elastic fibers; the osteogenic direction – the formation of lamellar, trabecular and nodular osteoid structures through intramembranous ossification, accompanied by activation of alkaline phosphatase and mineralization. The formation of enthesis predictors is the organization of commissures between mechanically different-phase components of osteoid structures and frame. A classification of taxonomic forms has been developed and a hypothesis has been proposed about the role of evolutionary tools in the structuring of the collagen framework in tissue cultures in vitro. The classification of taxonomic forms has been developed and a hypothesis has been proposed about the role of evolutionary tools in the structuring of the collagen framework in tissue cultures in vitro.
Истирание и биостойкость полиуретанового эластомера, модифицированного полифторированными полиэтиленполиаминами
Authors: Кудашев Сергей Владимирович , Полицимако Игорь Ангарович , Владимцева Ирина Владимировна , Ваниев Марат Абдурахманович , Нилидин Дмитрий Андреевич , Арисова Вера Николаевна , Богданов Артем Игоревич , Харламов Валентин Олегович , Климов Виктор Викторович , Желтобрюхов Владимир Федорович
Published: December 2024

Изучено модифицирующее влияние на структуру и свойства полиуретановых эластомеров полифторированных полиаминов, синтезируемых N-алкилированием полиэтиленполиаминов 1Н,1Н,9Н-тригидроперфторнонан-1-олом. Методами рентгеноструктурного анализа, ИК-Фурье-спектроскопии и золь-гель анализа исследована структура модифицированного полиуретана. Показано, что введение модификатора на стадии миграционной полимеризации изоцианата и полиола благоприятно сказывается на упрочнении получаемого фторполимера, снижении его истираемости и возрастании биостойкости.
Композитные сорбенты CO2 на основе 1-этил-3-метилимидазолия глицината: зависимость сорбционных свойств от текстуры носителя и анализ потребления тепловой энергии
Authors: Шешковас Андрей Жидрунович , Веселовская Жанна Вячеславовна , Рогов Владимир Алексеевич , Шалыгин Антон Сергеевич , Мартьянов Олег Николаевич , Козлов Денис Владимирович
Published: December 2024

Проведены исследования сорбции CO2 композитными сорбентами на основе ионной жидкости 1-этил-3-метилимидазолия глицината, диспергированной в порах мезопористого носителя (силикагеля). Сорбенты готовили методом пропитки носителей спиртовым раствором ионной жидкости, где в качестве носителя использовали набор из четырех коммерческих силикагелей, различающихся параметрами пористой структуры. Показано, что увеличение среднего размера пор силикагеля с 4.7 до 17.4 нм позволяет увеличить эффективность сорбции CO2 с 96.3 до 131.1 мг(СО2 ) на 1 г ионной жидкости. Изучена стабильность композитных сорбентов в циклических сорбционных экспериментах и в условиях линейного нагрева, показано, что на стабильность сорбционной емкости может существенно влиять температура регенерации образца. Так, снижение температуры регенерации с 373 до 353 K приводит к значительному увеличению стабильности значений сорбционной емкости. Определена теплоемкость 1-этил-3-метилимидазолия глицината (333 Дж·г–1 ·K–1 ), теплота сорбции CO2 композитными материалами (80.1–82.7 кДж·моль–1 ), а также проведен анализ потребления тепловой энергии на регенерацию композитных материалов в рамках сорбционного цикла [3.5–3.6 кДж·г(СО2 )–1 ].
Application of CF and DMAS Technology to Improve the Quality of Reflector Images Reconstructed from Echoes Measured by an Antenna Array
Authors: Bazulin E. G.
Published: December 2024

Reliability and sensitivity of ultrasonic control is determined by the noise level of the reflector image and its resolution. Application of CF- or DMAS-technology in various combinations is promising, as these technologies are simple enough, practically do not require additional computational resources, are applied to echo signals measured by conventional flaw detectors working with antenna arrays. In numerical and model experiments it is demonstrated that the application of these methods allows to increase the resolution of reflector images more than twice and to reduce the noise level by more than 20 dB. In the numerical experiment it is shown that phase distortions due to complex refractive and reflection coefficients lead to the fact that even with precisely known parameters of the experiment when working on a direct beam on a transverse wave the indication of the crack tip can shift from its true position by about a wavelength. For the solution of defectometry tasks this is a very large error. But, if phase correction is performed when reconstructing the reflector image, the crack tip indication coincides with its real position. CF- and DMAS-technologies have shown their workability also when working with noisy echoes.
Application of Pulse Gas-Discharge Electroacoustic Transducer for Non-Destructive Testing
Authors: Derusova D. A. , Nekhoroshev V. O. , Shpilnoy V. Yu. , Raut A. V.
Published: December 2024

This paper presents the results of a gas-discharge electro acoustic transducer of two configurations, operating on the basis of a pulsed discharge in air at atmospheric pressure. The influence of the electrode configuration on the acoustic characteristics of the transducer is considered. It is shown that a change in the volume of the discharge chamber and the inter electrode gap have a significant effect on the radiation intensity of the transducer. The features that arise when using open and closed type electro acoustic transducers in flaw detection problems are revealed. It is shown that an open type gas-discharge electroacoustic transducer is a sufficiently powerful broadband source of the excitation signal and has prospects for use in non-destructive testing. A closed type gas-discharge electroacoustic transducer has advantages when testing materials with special requirements for surface cleanliness or the magnitude of the applied external electric field.
Age and origin of Bereinsky complex Granitoids of Kamensky Terrane of the Monghol-Okhotsk orogenic belt: results of U-Pb (ID tims) geochronological and Sm-Nd isotope-geochemical research
Authors: Dril S. I. , Ivanova A. A. , Kovach V. P. , Kotov A. B. , Salnikova E. B. , Plotkina J. V. , Zarubina O. V.
Published: December 2024

Dating of magmatic rocks from paleo-island arcs of orogenic belts helps to define the precise timing of subduction processes that took place during the formation of the orogen. Within the central (East Trans-Baikal) part of the Mongol-Okhotsk orogenic belt, the Kamensk island-arc terrane is an example of such paleo-island-arc complex. Its intrusive part is included into the Bereinsky complex, represented by a gabbro-diorite-tonalite-plagiogranite series of rocks demonstrating subduction geochemical characteristics. The dating of zircons from acidic rocks of this complex by the U–Pb classical method showed that they were produced in a narrow time interval – 203±1–205±1 Ma, which corresponds to Norian/Rhaetian boundary of the Late Triassic. Taking into account the previously obtained age of the diorites (254±5 Ma), the timing of formation of the entire series of intrusive rocks is about 50 Ma, thus indicating in the Late Permian – Late Triassic the subduction along the northern (in modern coordinates) margin of the Mongol-Okhotsk Paleocean beneath the Siberian paleocontinent. Diorites of the first phase have positive values ɛND(254MA) = 3.2–3.6 (TNd(DM) = 879–994 Ma), and plagiogranites – ɛND(205MA) = 2.3–3.5 (TNd(DM) = 859–1028 Ma), which points to the connection of these rocks with the substance of the depleted mantle source and is consistent with the Sm-Nd isotope characteristics of the juvenile crust of the Central Asian orogenic belt. This study was supported by Russian Science Foundation, grant no. 22-27-00775. The resources of the Shared Use Center for Isotope-Geochemical Research (Vinogradov Institute of Geochemistry, Siberian Branch, Russian Academy of Sciences, Irkutsk) were used in this work.
On the solution of the interpretation tomography problem within the framework of the linear integral representation method and discrete gravity and magnetic potential theories
Authors: Stepanova I. E. , Kolotov I. I.
Published: December 2024

A new of principle approach to solving inverse problems of geophysics on the background of the linear integral representation method and discrete gravity and magnetic potential theories is proposed. This approach makes it possible to restore the continuously distributed masses with relatively high accuracy from the heterogeneous data in some network points.
PENGARUH PROFITABILITAS TERHADAP NILAI PERUSAHAAN DENGAN PENGUNGKAPAN GOOD CORPORATE GOVERNANCE SEBAGAI VARIABEL MODERATING
Authors: Siagian Mutiara Sani , As’ari Hasim
Published: December 2024

Penelitian ini bertujuan untuk menganalisis pengaruh profitabilitas terhadap nilai perusahaan serta memoderasi pengaruh tersebut dengan mengungkapkan Good Corporate Governance (GCG) pada perusahaan BUMN yang terdaftar di Bursa Efek Indonesia periode 2020-2022. Metode penelitian menggunakan analisis regresi data panel dengan sampel perusahaan manufaktur yang dipilih secara purposive sampling. Hasil penelitian menunjukkan bahwa Return on Equity (ROE) mempunyai pengaruh yang signifikan terhadap nilai perusahaan, sedangkan Return on Assets (ROA) tidak berpengaruh signifikan. Pengungkapan GCG tidak memperkuat pengaruh ROA maupun ROE terhadap nilai perusahaan. Kesimpulan penelitian ini menunjukkan bahwa profitabilitas melalui ROE lebih berperan dalam mempengaruhi nilai perusahaan, sementara GCG belum mampu menjadi variabel moderasi yang efektif.
Інтенсифікація освоєння свердловин на Західнохрестищенському родовищі
Authors: Myslyuk M. A. , Kravets V. P.
Published: December 2024

Описано технології завершення свердловин на кінцевій стадії розробки Західнохрестищенського газоконденсатного родовища, особливість яких полягає у проведенні гідравлічного розриву продуктивних пластів перед освоєнням. Наведено інформацію про геологічний розріз і пластові тиски, конструкції свердловин, технології розкриття продуктивних пластів. Запропоновано концепцію технологій завершення свердловин, спрямовану на досягнення високих показників буріння, запобігання ускладнень і забруднення продуктивних горизонтів. Формалізовано вибір оптимальних рецептур технологічних рідин для розкриття продуктивних пластів та освоєння свердловин. З урахуванням світового та вітчизняного досвіду наведено вимоги до сценаріїв підготовчих робіт і типових дизайнів операцій технологій гідравлічного розриву пласта із вмістом 15 та 45 т пропанту. Систематизовано промисловий матеріал освоєння свердловин із використанням гідравлічного розриву пласта на Західнохрестищенському родовищі. На основі кореляційного аналізу вивчено статистичні зв’язки між показниками реалізації та основними параметрами технологій.
Особливості оцінки регіональних інженерно-геологічних загроз в Україні у воєнний і повоєнний періоди
Authors: Yakovlev Ye. O. , Rogozhin O. G. , Kreta D. L.
Published: December 2024

При розробленні заходів щодо захисту об’єктів критичної інфраструктури, а також планів і проєктів їх післявоєнного відновлення необхідно враховувати інженерно-геологічні загрози техногенної інтенсифікації руйнівної дії небезпечних екзогенних геологічних процесів. Передусім варто враховувати підтоплення та перезволоження ґрунтів, карст, зсуви, просадки, оскільки стійкість основних конструкцій безпосередньо залежить від забезпечення стійкості ґрунту, який “тримає” фундаменти конструкцій. Наведено результати ГІС-аналізу основних інженерно-геологічних загроз. Показано, що зони підвищеного рівня загрози зосереджені насамперед у частково окупованих південних та східних областях України, охоплених активними бойовими діями. Ця обставина потребує відображення в післявоєнних програмах відновлення об’єктв критичної інфраструктури та виділення спеціального фінансування на проведення глибоких інженерно-геологічних досліджень.
Rolling resistance of marine airbags at the longitudinal inclined slipway during ship launching
Authors: Rashkovskiy S.A. , Rashkovskyi A.S.
Published: December 2024

There are three principal methods of launching a new ship including gravitational launching, floating-out launching and mechanical launching. A launching with marine airbags is a new kind of gravitational launching; it allows launching the ships which DWT is below 60,000 tonnes. In this paper we consider the ship launching by using marine airbags. The main principle of airbag ship launching is based on changing the force of sliding friction into rolling friction. One of the important characteristics of such devices is resistance force which occurs during airbag rolling under the compressive load. This force can be named rolling friction, however we show that the mechanism of the resistance force during airbag rolling, is fundamentally different from the well-known mechanism of rolling friction which occurs during rolling of the solid deformable body. We show that the rolling friction coefficient of airbags and ground depends on the ground situation and airbag bearing forces. We determine the marine airbag shape and three components of the force of rolling friction depending on geometric parameters and values of pulling and compressive forces. We show that the main component of this force is related to appearance of bending moments in the airbag shell during its rolling. We have shown that coefficient of rolling friction as a function of compressive force has a minimum after which it slightly depends on compressive force. The method of calculating the motion of a ship in case of ship launching from the longitudinal inclined slipway by using marine airbags is discussed.
A method of the top-down approach for quick subdivision
Authors: Guan Guan , Lin Yan , Ji Zhuoshang
Published: December 2024

Currently, the bottom-up approach for subdivision is applied in shipyards. That is, a compartment of a ship is generated by modeling all compartments one by one. However, this method requires much time and efforts as the ship consists of compartments of several tens to several hundreds. To solve this problem, a new parametric subdivision method of the top-down approach is proposed in this study. The proposed method is based on space subdivision as if we cut a watermelon into many small pieces. For this, several parameters (bulkhead and inner knuckle positions) are set to generate the subdivision polyhedrons to split the hull. Non-manifold modeling and its Boolean operations are applied. As a result, this method reduces the complexity of subdivision and visually reflects the designer's idea. It is proved that the subdivision and the calculation of hold capacities can be finished rapidly by this method, which lays the foundation for 3D parametric design of ship.
The sinking of the Ro–Ro passenger ferry SS Heraklion
Authors: Papanikolaou A. , Boulougouris E. , Sklavenitis A.
Published: December 2024

On December 8, 1966 the Ro–Pax ferry SS Heraklion capsized and sank in the Aegean Sea, resulting in the death of over 200 people. The present paper tries to shed some light into the various events that led to the largest tragedy of modern Greek maritime history. It re-constructs the accidental data based on a variety of original investigation reports, ship files and legal evidence. Ship's loading, intact and damage stability behaviour were re-investigated and the flooding/sinking of the ship was simulated by use of a time simulation method. Results of our investigation were compared with available testimonies of survivors. It was found that downflooding of large void spaces below the flooded car deck and the effect of multiple free surfaces on ship's stability was eventually the main reason for SS Heraklion's capsize.
A Marine Vehicle Concept
Authors: Asfar K.R. , Nayfeh A.H.
Published: December 2024

An experimental investigation of a proposed new type of surface marine vehicle is presented. The vehicle works above water surface so that its body does not come in contact with water, thereby eliminating viscous drag. It develops its lifting and thrust forces by the impact of special wheels with the water surface, thus creating hydrodynamic forces of lift and drag. The results indicate the feasibility of the proposed vehicle concept and identify some of the parameters that affect its performance.
Linear and Nonlinear Hydrodynamic Forces Acting on a Segmented Heaving Wigley Model
Authors: Adegeest L.J.M.
Published: December 2024

Linear and nonlinear hydrodynamic reaction forces are investigated by using a ship model, heaving with large amplitudes on a free surface, with forward speed. The ship model used is a mathematically described segmented Wigley model.

The hydrodynamic reaction forces are measured and from these the first-, second- and third-order force components are obtained by using Fourier analysis. The first-order components are compared with the theoretical added mass- and damping-distribution. The computations are based on 3-D potential theory. The second-order components are compared with a theoretical approximation based on an extension of the linear potential theory. The calculated first-order forces as well as the second-order forces compare well with the experimental values. The relative importance of the various force components is discussed.
Investigation of Towed Vessel Trajectory in Shallow Water
Authors: Petitfaux Christophe , Latorre Robert
Published: December 2024

Results of systematic model tests of a towed ship in deep and shallow water are presented to illustrate the influence shallow water has on the towed vessel trajectory, resistance, and towed vessel course stability. It is shown that towing in shallow water results in an amplification of the towed vessel trajectory resulting in larger offset and longer response period. This amplification appears to be the same when the vessel is towed at different speeds in shallow water. These experimental results provide guidance on estimating the towed ship path in shallow water from deep water tests.
Nonlinearly Coupled Pitch and Roll Motions in the Presence of Internal Resonance; Part I, Theory
Authors: Nayfeh A.H. , Oh I.G.
Published: December 2024

The dynamic stability and complicated motions of a vessel in following or head regular waves are investigated when the frequency in pitch is nearly twice the frequency in roll. The damping in the pitch mode is modeled by a linear viscoins damping term, whereas that of the roll mode is modeled by the sum of a linear viscous part and a quadratic viscous part. The method of multiple scales is used to determine a system of four nonlinear first-order equations governing the modulation of the amplitudes and phases of the pitch and roll. Force-response and frequency-response curves are generated. Coexistence of multiple solutions is found. The jump phenomenon continues to exist, whereas the saturation phenomenon ceases in the presence of quadratic damping. Hopf bifurcations are found. Near these bifurcations, the modulation equations possess limit-cycle solutions and hence the steady-state motion is a periodically modulated pitch and roll motion. Numerical simulations are used to investigate the bifurcations of these limit cycles and how they lead to chaos and hence chaotically modulated pitch and roll motions.
Computation of Added Wave Resistance of a Restrained Floating Body in the Time-Domain
Authors: Ye H.K. , Hsiung C.C.
Published: December 2024

The time-domain analysis is applied to study the added resistance of a restrained floating body moving with a steady forward speed in waves. It is treated as an initial-boundary value problem and solved by the time-domain Green function method. The body boundary condition is satisfied exactly on each instantaneous wetted body surface, and the linearized free surface condition is applied. The added resistance computation is carried out by integrating pressures on the wetted body surface. A submerged spheroid and a surface-piercing vertical circular cylinder are selected as numerical examples. Good agreements are obtained by comparing with the transformed results from the frequency-domain computation. Wave exciting force on Series 60 CB=0.7 is also computed to verify the computational method.
Crash-Stop Manoeuver of Pushed Convoys on Inland Waterways
Authors: Žerjal Marko , Bilen Branislav , Marinković Marija
Published: December 2024

The paper treats the problem of crash-stop manoeuver which is of great importance for vessels navigating at restricted and overcrowded inland waterways. A brief review of existing international regulations covering stopping process on inland waterways is given. Three characteristic phases of crash-stop manoeuver for a typical Danube pushboat are described and a simplified calculation procedure is propsed for estimation of stopping distance and stopping time period for a vessel. A propeller's reverse thrust prediction during crash-stop manoeuver was determined according to results of W.B. series 4 quadrant open water testing. Simple emperical formulas for calculation of propeller's reverse thrust are given either for conventional W.B. series propeller and propeller series KA operating in nozzle type 19A. At the end, some concluding remarks are given on how to influence the stopping abilities of a vessel in design phase. The accuracy of proposed calculation procedure is illustrated through comparison to results of crash-stop trial testing for a pushed concoy and a cargo ship.
Solving Hydrodynamic Problems for Twin-Hull Body by Phase Transfer Method
Authors: Fang Ming-Chung , Liou Yi
Published: December 2024

Based on the strip theory, the authors use the phase transfer technique to treat the hydrodynamic problems for a twin-hull structure in the paper. Using the method, the total forces on the twin-hull structure can be obtained by calculating the corresponding hydrodynamic coefficients for a single body only. There is no need to calculate the force on each body twice and the hydrodynamic interactions are not included. Practically the present method is suitable for predicting the corresponding hydrodynamic properties of a semisubmersible and a SWATH ship with high speed because the hydrodynamic interactions are not significant for these two cases. The results obtained in the paper indeed show the present idea is reasonable and therefore the method developed here can be considered as a efficient tool to analyze the hydrodynamic problems for some twin-hull body structures with less interaction effects in waves, either with or without speed.
Numerical and experimental investigation of weld root fatigue in fillet-welded structures
Authors: Fricke Wolfgang , Kahl Adrian
Published: December 2024

For fabrication reasons, a great part of the joints in ship structures are welded with non-penetrating fillet welds. This implies the risk of fatigue failure originating from the weld root under cyclic loading. A fatigue analysis may be performed using the nominal stress approach, which is rather coarse, and the crack propagation approach, which is less practical due to the high computational effort. Alternatives are offered by the effective notch stress approach, which assumes a fictitious radius at the tip of the non-fused root faces and by a newly developed structural stress approach for weld failures. The latter is outlined in the paper and applied to the fillet-welded end of a rectangular hollow section (RHS) and to a doubler plate under out-of-plane loads. These represent typical situations with one-sided welds subjected to local throat bending, where fatigue tests have generally shown weld root failure. From the fatigue lives, a design S–N curve based on the structural weld stress is derived. For further verification, the effective notch stress approach is applied to the RHS-joint showing similar results in relation to the design S–N curve as the structural stress approach.
Research on quick design support system for ship structure modeling
Authors: Zhan Yiting , Liu Yujun , Deng Yanping
Published: December 2024

The concept and framework of a ship knowledge library that supports quick design and modeling were put forward based on research on the knowledge representation of hull structure components and the organizational mechanism, combined with the digital design technology and the RPD development approach. The knowledge framework could be used to encapsulate the digital design functionality for the hull structure and manage correlation information using a distributed database. Then a prototype software system was developed, achieving the quick design and alteration of the 3D structure model, which was demonstrated with a fact ship model.
Performance of dynamic azimuthing podded propulsor
Authors: Akinturk Ayhan , Islam Mohammed F. , Veitch Brian , Liu Pengfei
Published: December 2024

This paper presents results and analyses of an experimental study into the effects of static and dynamic azimuthing conditions on the propulsive characteristics of a puller podded unit in open water. The model propulsor was instrumented to measure thrust and torque of the propeller, three orthogonal forces and moments on the unit, rotational speed of the propeller, azimuthing angle and azimuthing rate. The model was first tested over a range of advance coefficients at various static azimuthing angles in the range of −180° to 180°. These tests were followed by tests in which the azimuthing angle was varied dynamically at certain azimuthing rate and propeller rotational speed. A comparative study of the performance coefficients at static and dynamic azimuthing conditions in the range of −180° to 180° is presented. The performance coefficients of the propeller and the pod unit showed a strong dependence on the propeller loading and azimuthing angle. The coefficients in static azimuthing conditions fit well with a 10th order polynomial fit of the data obtained in the dynamic azimuthing condition in the corresponding azimuthing angles and advance coefficient. An uncertainty analysis of the measurements is also presented.
Perspectivismo relacional e redes interafetivas – por uma reconsideração da inteligência a partir de uma ontologia não-antropocêntrica
Authors: Barros Bogéa Diogo
Published: December 2024

Procuramos nesse artigo ressituar algumas questões sobre a chamada “inteligência artificial” a partir da apresentação de uma ontologia não-antropocêntrica. O artigo se divide em quatro seções: na primeira relembramos o caráter fortemente antropocêntrico da própria noção de “inteligência”. Na segunda seção apresentamos os conceitos de matéria vibrante e afeto impessoal de Jane Bennett como fundamentos para a elaboração de uma ontologia não-antropocêntrica. Em seguida, trazemos o perspectivismo relacional como alternativa às concepções dualistas e antropocêntricas de inteligência. Por fim, introduzimos a função-fantasia como expansão da lógica do Revirão do psicanalista MD Magno. Esperamos com esse percurso contribuir para a recolocação das questões sobre a inteligência artificial em novas bases – ou seja, no âmbito de uma concepção imanente, relacional e não-antropocêntrica.
Oswaldo Porchat e a filosofia do Senso Comum
Authors: França Freitas Vinícius
Published: December 2024

O artigo avança a hipótese de que a filosofia do saber comum de Oswaldo Porchat pode ser aproximada da filosofia do senso comum, especificamente, do pensamento de Thomas Reid. Argumenta-se que, muito embora ambos os filósofos revelam pontos de partida distintos, as propostas filosóficas de Porchat e Reid apresentam ao menos seis pontos de contato: as noções de ‘saber comum’ e ‘senso comum’; a universalidade das crenças que constituem formas de saber; a impossibilidade de justificá-las racionalmente; o caráter filosófico do saber comum e do senso comum; a pretensão moderada de fundamentação de ambos; o ridículo da oposição ao saber comum e ao senso comum.
A Tecnicidade e a Teoria Ator Rede: perspectivas para investigar o impacto da Inteligência Artificial sobre o Social
Authors: Carlan da Silveira Stefanie , Costa Nunes Matheus
Published: December 2024

A agenda de pesquisa que investiga a interação de humanos com inteligências artificiais (IA) tem ganhado destaque recentemente com a popularização de ferramentas como ChatGPT, Gemini e Midjourney. Este artigo propõe uma discussão introdutória, exploratória e teórica sobre as limitações da sociologia tradicional para investigar a problemática dos atores não-humanos. Paralelamente, o texto apresenta uma revisão de literatura sobre os conceitos básicos que contornam o advento da inteligência artificial. Por fim, o artigo coloca em discussão um arcabouço teórico baseado na Teoria Ator-Rede (TAR) de Bruno Latour, junto à tecnicidade de Gilbert Simondon, como uma abordagem de pesquisa consistente para estudar a interação de usuários e algoritmos inteligentes, humanos e não humanos.
The Philosophy of Technology at a crossroads: Heidegger and the limits of the empirical turn
Authors: Ferreira de Barros Matheus
Published: December 2024

The philosophy of technology, as a relevant theoretical field in contemporary philosophy, has a history that dates back to the classic philosophers of technology, as well as to the subsequent movement known as the empirical turn. However, as discussed in the field's specialized literature, several impasses currently challenge the objectives of the empirical turn. These impasses are particularly evident when considering technological phenomena from a planetary perspective, making it difficult nowadays to conceive a philosophical inquiry exclusively focused on analyzing technical objects and their local usage contexts. Therefore, this work aims to explore this historical-philosophical trajectory, beginning with thinkers such as Martin Heidegger and culminating in the present day, inquiring about the limits of the empirical turn.
Efficiency Meets Fidelity: A Novel Quantization Framework for Stable Diffusion
Authors: Li Shuaiting , Deng Juncan , Wang Zeyu , Gu Hong , Xu Kedong , Shen Haibin , Huang Kejie
Published: December 2024

Text-to-image generation of Stable Diffusion models has achieved notable success due to its remarkable generation ability. However, the repetitive denoising process is computationally intensive during inference, which renders Diffusion models less suitable for real-world applications that require low latency and scalability. Recent studies have employed post-training quantization (PTQ) and quantization-aware training (QAT) methods to compress Diffusion models. Nevertheless, prior research has often neglected to examine the consistency between results generated by quantized models and those from floating-point models. This consistency is crucial in fields such as content creation, design, and edge deployment, as it can significantly enhance both efficiency and system stability for practitioners. To ensure that quantized models generate high-quality and consistent images, we propose an efficient quantization framework for Stable Diffusion models. Our approach features a Serial-to-Parallel calibration pipeline that addresses the consistency of both the calibration and inference processes, as well as ensuring training stability. Based on this pipeline, we further introduce a mix-precision quantization strategy, multi-timestep activation quantization, and time information precalculation techniques to ensure high-fidelity generation in comparison to floating-point models.

Through extensive experiments with Stable Diffusion v1-4, v2-1, and XL 1.0, we have demonstrated that our method outperforms the current state-of-the-art techniques when tested on prompts from the COCO validation dataset and the Stable-Diffusion-Prompts dataset. Under W4A8 quantization settings, our approach enhances both distribution similarity and visual similarity by 45%\(\sim\)60%.
The Mediating Role of Self-Compassion in the Relationship between Psychological Flexibility and Depression
Authors: Özen Ceyda Sevdenur , Sapancı Ahmet , Uğur Erol
Published: December 2024

The study explored the mediating role of self-compassion in the relationship between psychological flexibility and depression. The participants consisted of 307 people, 183 women and 124 men, aged between 18- 59. The study employed the correlational research design, one of the quantitative research methods. The data were collected using the Demographic Information Form, the Beck Depression Inventory, the Acceptance and Action Questionnaire-II, and the Self-Compassion Scale. In data analysis, the independent samples t-test and mediation analysis methods were used. According to the mediation analysis, self-compassion had a partial mediating role in the relationship between psychological flexibility and depression. The findings were discussed in the context of previous studies and recommendations were given.
The Role of Social Media in Marital Relationships: A Symbolic Interactionist Perspective
Authors: Kıymaz Esra , Akıncı Çötok Nesrin
Published: December 2024

As part of the digital transformation of modern societies, social media has become a space where individuals express their identities, display their social roles, and make their relationships visible. This study adopts a symbolic interactionist framework to explore how social media reflects meaning, identity, and role processes within marital relationships. The research was conducted using a qualitative methodology. In the first phase, semi-structured interviews were conducted with 30 participants, and two focus group interviews with six people each were then used to deepen the findings. The data were analyzed thematically under the guidance of symbolic interactionist theory, and three main themes emerged: "new forms of communication in marriage," "representation of marriage on social media," and "definition of relationship roles." The findings show that social media serves as a tool for creating new meanings, identities, and roles in marriage. Within the framework of symbolic interactionism, social media symbols contribute significantly to strengthening emotional bonds, building trust, mitigating conflict, and raising awareness of gender roles in marital relationships. In addition, demographic factors such as age, years of marriage, and gender, as well as individual preferences and relationship dynamics, were found to influence meanings, identities, and roles within these interactions.
Penggunaan Metode Machine Learning Random Forest untuk Prediksi Longsor pada Kabupaten Karanganyar
Authors: Kusumawati Rahayu , Dananjaya Raden Harya , Surjandari Niken Silmi
Published: December 2024

Tanah longsor adalah salah satu bencana alam yang banyak terjadi di Indonesia terutama Provinsi Jawa Tengah, dengan salah satu daerah yang memiliki kerawanan longsor yang cukup tinggi adalah Kabupaten Karanganyar. Penelitian ini dilakukan untuk menyediakan informasi mengenai kerawanan longsor wilayah Kabupaten Karanganyar dalam suatu bentuk peta yang nantinya dapat dijadikan sebagai sumber tinjauan informasi yang detail dalam upaya mitigasi bencana. Penelitian ini akan memertimbangkan sembilan faktor pengondisi longsor, yaitu jarak terhadap jalan sekunder dan tersier, elevasi, slope, Topographic Wetness Index (TWI), tataguna lahan, litologi, Normalized Difference Vegetation Index (NDVI), dan hujan. Penyusunan peta kerawanan longsor dilakukan menggunakan machine learning dengan metode Random Forest pada pengaturan parameter default dengan bantuan modul Scikit Learn. Validasi model dilakukan menggunakan metode ten-folds cross validation. Hasil prediksi longsor selanjutnya diklasifikasikan men-jadi lima kelas kerawanan longsor menggunakan metode Natural Breaks (Jenk’s) yang performanya akan dievaluasi dengan nilai landslide density.  Hasil penelitian ini menunjukkan bahwa metode machine learn-ing Random Forest dapat digunakan untuk memetakan wilayah kerawanan longsor pada Kabupaten Ka-ranganyar. Model yang dihasilkan mampu mengklasifikasikan seluruh wilayah kerawanan longsor dengan nilai AUC mencapai 0,9678, serta menunjukkan hasil klasifikasi yang baik ditandai dengan semakin meningkatnya nilai landslide density pada kelas kerawanan yang semakin tinggi.
Cloud-Enabled Innovation in Retail: Transforming Inventory Management and Demand Forecasting
Authors: Chaitanya Teja Musuluri
Published: December 2024

This comprehensive article explores the transformative impact of cloud computing technologies on the retail industry, examining core platform solutions, implementation strategies, and future trends. The article investigates how cloud integration has revolutionized inventory management, demand forecasting, and operational efficiency across the retail sector. Through detailed case studies of major retailers, the research demonstrates the substantial benefits of cloud adoption in areas such as real-time data processing, predictive analytics, and supply chain optimization. The article encompasses technical considerations, best practices, and emerging technologies, providing insights into successful implementation strategies and operational guidelines. The article further evaluates the integration opportunities and standardization initiatives shaping the future of retail cloud computing, highlighting the critical role of artificial intelligence, blockchain, IoT, and advanced analytics in driving industry innovation.
AI-Driven Governance for DevOps Compliance
Authors: Belidhe Sandeep
Published: December 2024

This particular form of research, specialism DevOps compliance governance, aims to explore how AI is used to complement it. It also shows how AI can fully automate compliance checks, intelligent risk assessments, round-the-clock security monitoring, policies, and policy compliance and automatically prepare the necessary documentation. In AI, human error is eliminated, compliance workflows are accelerated, and constant compliance can be sustained in diverse DevOps settings. The study shows that, with AI implementation, the compliance teams can achieve both dogma and security while allowing the development teams to preserve speed. Finally, AI harnessing in DevOps makes the ways of the respective governance smoother, more accurate, and more reliable for organizations understanding and managing challenging regulatory processes.