bluuebunny/crossref_metadata_2025 huggingface dataset:
In situ palladium-doped conjugated polymer network for visible light and natural sunlight-driven Suzuki type cross-coupling reaction at room temperature
Authors: Laxmi Raj , Anshuman  , Anamika  , Gupta Neelam , Kuila Biplab K.
Published: April 2024

An in situ Pd doped conjugated polymer network-based efficient photocatalyst has been developed to carry out Suzuki type cross coupling reaction under visible light or sunlight.
Development of a multi-enzyme cascade for 2′3′-cGAMP synthesis from nucleosides
Authors: Becker Martin , Nowak Isabel , Hildebrand Katharina , Lütz Stephan , Rosenthal Katrin
Published: April 2024

A five-enzyme cascade was developed for the synthesis of the cyclic dinucleotide 2′3′-cGAMP from nucleosides in seven reaction steps.
The role of intermolecular interactions in [Fe(X-salEen)2]ClO4 spin crossover complexes
Authors: Bento Marcos A. , Gomes Tiago , Martins Frederico F. , Gil Adrià , Ferreira Liliana P. , Barroso Sónia , Gomes Clara S. B. , Garcia Yann , Martinho Paulo N.
Published: April 2024

This study reveals two new spin crossover Fe(iii) compounds, analyses their structural and magnetic properties together with halogen substitution effects, and highlights the role of the halogen in spin crossover, guiding future molecular design.
Deciphering the structure and potassium-ion transport mechanism of potassium borate glass
Authors: Song Lulu , Hannon Alex C. , Feller Steve , Liu Ruirui , McGuire Peyton , Zhang Bo , Zhou Yongquan , Li Wu , Zhu Fayan
Published: April 2024

In this work, the transport path of potassium ions in potassium borate glass and structural units, NBO and cavity occupancy that affect the transport of potassium ions were analyzed in detail.
A pillar-layered Ni2P–Ni5P4–CoP array derived from a metal–organic framework as a bifunctional catalyst for efficient overall water splitting
Authors: Ni Qihang , Zhu Zixian , Wang Yan , Jiang Chengyu , Wang Min , Zhang Xiang
Published: April 2024

A pillar-layered Ni2P–Ni5P4–CoP–C array on nickel foam derived from a Ni–Co metal–organic framework exhibits high activity towards both the HER and OER in alkaline media as a bifunctional catalyst.
Enhanced flushing mechanism of petroleum hydrocarbon contaminated sandy soil by air nano bubbles
Authors: Liu Chunjiang , Xiang Minghui , Yang Chen , Chen Yiran , Li Zhongyuan , Wang Wu , Yin Wei , Li Hui , Huang Yuan
Published: April 2024

The NBs have the best removal rate of petroleum hydrocarbon pollutants in porous media under weakly alkaline condition (pH = 7–8). Both strong acidity and strong alkalinity are not conducive to the flushing removal of pollutants.
A new mechanism for visible light photocatalysis: generation of intraband by adsorbed organic compounds with wide-bandgap semiconductors
Authors: Wang Teng , Cao Jiachun , Li Juan , Li Juntian , Li Didi , Wang Shaobin , Ao Zhimin
Published: April 2024

A novel mechanism has been revealed by the study that the adsorption of VOC molecules on the surface of semiconductors formed midgap states between the ground state of the VOCs and the conduction band of the semiconductor.
Cladodes of Opuntia ficus indica as a functional ingredient in the production of cookies: physical, antioxidant and sensory properties
Authors: Aparicio-Ortuño Rocío , Jiménez-González Oscar , Lozada-Ramírez J. Daniel , Ortega-Regules Ana E.
Published: April 2024

Cladodes of Opuntia ficus indica: a functional ingredient for healthful foods. Study on cookies substituting wheat flour with cladode powder.
Deep eutectic solvent boosted ruthenium catalysts for acetylene hydrochlorination
Authors: Li Linfeng , Wang Bao , Zhang Tiantong , Zhang Haiyang , Li Wei , Wu Jiangjiexing , Zhang Jinli
Published: April 2024

Ru-DES/AC catalysts modulate the microchemical environment around the active centre through electron transfer, and the hydrogen bond length between HBD and HBA in DES can be used to design high performance catalysts.
Carbon nanomaterials as carriers for the anti-cancer drug doxorubicin: a review on theoretical and experimental studies
Authors: Gayathri K. , Vidya R.
Published: April 2024

Effect of Doxorubicin on cancer cells.
MXene boosted MOF-derived cobalt sulfide/carbon nanocomposites as efficient bifunctional electrocatalysts for OER and HER
Authors: Farooq Komal , Murtaza Maida , Yang Zhuxian , Waseem Amir , Zhu Yanqiu , Xia Yongde
Published: April 2024

MXene-containing cobalt sulfide/carbon nanocomposites derived from MXene/ZIF-67 precursors exhibited highly efficient enhanced bifunctional electrocatalytic performances both in HER and OER.
Polyketides with α-glucosidase inhibitory and neuroprotective activities from Aspergillus versicolor associated with Pedicularis sylvatica
Authors: Jiang Ting-Ting , Zhai Liang-Liang , Wang Zi-Jue , Wang Xin-Yu , Li Jian-Nan , Zhai Yi-Jie , Li Ding , Han Wen-Bo
Published: April 2024

Eight α-glucosidase inhibitory and neuroprotective polyketides from Aspergillus versicolor were reported in this article.
Amino acids as bio-organocatalysts in ring-opening copolymerization for eco-friendly synthesis of biobased oligomers from vegetable oils
Authors: Werlinger Francisca , Beroíza-Duhart Monserrat , Douglas-Gallardo Oscar A. , Oyarzo-Aro Silvia , Valenzuela Maria Luisa , Trofymchuk Oleksandra S. , Flores Mario E. , Martínez Javier
Published: April 2024

This is the first contribution reported to date in the literature in which natural precursors such as amino acids (AAs) have been effectively employed as bio-organocatalysts for the preparation of biobased polyesters.
Pd(ii)/LA-catalyzed acetanilide olefination with dioxygen
Authors: Li Kaiwen , Dong Shuangfeng , Li Shuang-Long , Chen Zhuqi , Yin Guochuan
Published: April 2024

The presence of a Lewis acid can promote Pd(OAc)2-catalyzed acetanilide olefination with dioxygen to proceed smoothly under mild conditions, whereas the reaction with Pd(OAc)2 alone was sluggish.
Efficient and scalable synthesis of 3,4-dihydroisoquinolin-1(2H)-ones by benzylic oxidation of tetrahydroisoquinoline derivatives using cerium ammonium nitrate (CAN)
Authors: Luo Jiajun , Li Zhilong , He Jiaxin , Li Tong , Wu Daochen , Lai Yang , Sun Haiying
Published: April 2024

A series of benzolactams were synthesized by the oxidation of tetrahydroisoquinoline derivates with CAN (cat.) and NaBrO3.
Palladium/copper-cocatalyzed three-component tandem cyclization of o-alkenyl arylisocyanides and sulfur ylides with alcohols: direct synthesis of spiro 3,3′-cyclopropyl oxindoles
Authors: Gong Yue , Xu Xue-Cen , Yang Zi-Xuan , Zhao Yu-Long
Published: April 2024

A novel palladium/copper-cocatalyzed tandem cyclization of o-alkenyl arylisocyanides and sulfur ylides with alcohols has been developed, providing a simple and efficient method for the synthesis of spiro 3,3′-cyclopropyl oxindoles in a single step.
Dual photoredox/nickel-catalyzed Mizoroki–Heck cross-coupling reactions
Authors: Dong Jun , Hu Yanfei , Tang Yan , Zhao Fen , Zhou Yongyun , Fan Baomin
Published: April 2024

A method for the Mizoroki–Heck reaction of electron-deficient olefins acrylates with aryl bromides to obtain α-arylation products of acrylates via a dual light/nickel catalytic system is described. This transformation features a broad substrate scope, good functional group tolerance.
Elucidating the performance of hexamethylene tetra-amine interlinked bimetallic NiCo-MOF for efficient electrochemical hydrogen and oxygen evolution
Authors: Zahid Rida , Abdul Karim Muhammad Ramzan , Khan Fahd Sikandar , Marwat Mohsin Ali
Published: April 2024

This study investigates the electrocatalytic water splitting capabilities of hexamethylene tetra-amine-linked NiCo-MOF, synthesized via hydrothermal approach. It reveals low overpotentials of 274 mV and 330 mV with Tafel slopes of 78 mV dec−1 and 86 mV dec−1 towards HER and OER respectively.
Molecular engineering to design a bright near-infrared red photosensitizer: cellular bioimaging and phototherapy
Authors: Li Zhiyong , Xie Yili , Liu Heng , Wang Jing , Wang Gang , Wang Hengxin , Su Xuejie , Lei Meixu , Wan Qing , Zhou Yali , Teng Muzhou
Published: April 2024

NIR fluorescence-guided PDT offers deep tissue penetration & real-time monitoring, enabling precise tumor treatment with minimal side effects, making it a promising approach for cancer therapy.
Exploring the effect of the covalent functionalization in graphene-antimonene heterostructures
Authors: Fickert M. , Martinez-Haya R. , Ruiz A. M. , Baldoví J. J. , Abellán G.
Published: April 2024

van der Waals heterostructure preparation based on hexagonal Sb and graphene, and its subsequent patterning through functionalization with benzyl substituents.
Construction of a novel ternary synergistic CuFe2O4–SnO2-rGO heterojunction for efficient removal of cyanide from contaminated water
Authors: Mishra Soumya , Sahoo Naresh Kumar , Sahoo Prasanta Kumar , Sahoo Satyanjib , Nayak Lopamudra , Rout Prangya Ranjan
Published: April 2024

Many industrial effluents release cyanide, a well-known hazardous and bio-recalcitrant pollutant, and thus, the treatment of cyanide wastewater is a major challenge.
Selection, characterization, and biosensing applications of DNA aptamers targeting cyanotoxin BMAA
Authors: Santiago-Maldonado Xaimara , Rodríguez-Martínez José A. , López Luis , Cunci Lisandro , Bayro Marvin , Nicolau Eduardo
Published: April 2024

Scientists have established a connection between environmental exposure to toxins like β-N-methylamino-l-alanine (BMAA) and a heightened risk of neurodegenerative disorders.
Insights into molecular accessibility in catalyst and sorbent materials using NMR porosity measurements
Authors: Ward-Williams J. A. , Guédon C. M. , Mantle M. D. , Sederman A. J. , Gladden L. F.
Published: April 2024

NMR measurements of porosity allow the actual porosity experienced by molecules of interest to be directly measured.
Cobalt site coordinated polyterthiophene derivant/hematite hybrid photoanode for light-driven water oxidation
Authors: Shang Wenhao , Yang Hao , Li Yingzheng , Liu Chang , Zhao Ziqi , Shan Yu , Li Fei , Sun Licheng , Li Fusheng
Published: April 2024

The cobalt site-modified polymer could significantly promote charge transfer and reduce charge recombination of hematite for light-driven water oxidation.
Mechanics and microstructure of blood plasma clots in shear driven rupture
Authors: Ramanujam Ranjini K. , Garyfallogiannis Konstantinos , Litvinov Rustem I. , Bassani John L. , Weisel John W. , Purohit Prashant K. , Tutwiler Valerie
Published: April 2024

Intravascular blood clots are subject to hydrodynamic shear and other forces that cause clot deformation and rupture (embolization).
Mesoscale simulations of diffusion and sedimentation in shape-anisotropic nanoparticle suspensions
Authors: Wani Yashraj M. , Kovakas Penelope Grace , Nikoubashman Arash , Howard Michael P.
Published: April 2024

We investigate the self-diffusion and sedimentation of suspensions of shape-anisotropic nanoparticles using a novel mesoscale model.
Anisotropic crystal growth in blue phase I transitioned from a uniformly oriented cholesteric phase
Authors: Nakajima Kazuma , Ozaki Masanori
Published: April 2024

Control of nucleation positions in the cholesteric-blue phase I transition by surface alignment patterning and anisotropic growth of blue phase I crystals.
Pathways for vanillin production through alkaline aerobic oxidation of a phenolic lignin model compound, guaiacylglycerol-β-guaiacyl ether, in concentrated aqueous alkali
Authors: Ishikawa Ayami , Hosoya Takashi , Miyafuji Hisashi
Published: April 2024

There are at least two plausible pathways for vanillin production in the alkaline aerobic oxidation of lignin, as suggested by the degradation of model compounds.
Coupling doped halogen sites in copper(i)–organic frameworks with cuprous oxide for high selectivity CO2 photoreduction with H2O
Authors: Liang Jing , Huang Shengfu , Chang Yuan , Terfort Andreas , Gao Junfeng , Liu Jinxuan
Published: April 2024

Copper(i)–organic frameworks (CuX–bpy) loaded on Cu2O enable efficient CO2 photoreduction to formate, leveraging halogens (X = Cl, Br, I) and rapid electron transfer, achieving 1520 μmol g−1 in 12 hours without sacrificial agents or photosensitizers.
Elucidating the mechanism of microscopic conduction in cathode composites for all-solid-state batteries through scanning spreading resistance microscopy
Authors: Gamo Hirotada , Maeda Yasushi , Kiyobayashi Tetsu , Siroma Zyun , Sano Hikaru
Published: April 2024

Local resistance of cathode composites in all-solid-state batteries is investigated by scanning spreading resistance microscopy, providing microscopic insights that emphasize contact resistance within electrode composites.
A fluorene–carbazole conjugated polymer hole conductor for efficient and stable perovskite solar cells
Authors: Wang Bei , Guo Junjun , Luo Xuanang , Han Chenxu , Zhao Bo , Ullah Ihsan , Kong Yuxin , Zhao Xinyu , Ying Lei , Yuan Jianyu
Published: April 2024

Semiconducting lead halide perovskites are currently attracting increasing attention, showing great potential for next-generation photovoltaic devices.
Linker installation transformations in a 2-D rare earth MOF: increase of the dimensionality and turn on of the temperature sensing capability
Authors: Komodiki Laoura K. , Panagiotou Nikos , Serier-Brault Hélène , Tasiopoulos Anastasios J.
Published: April 2024

A new 2-D 8-connected rare earth (RE) MOF based on a hexanuclear (RE3+)6 SBU, the increase of the dimensionality through SCSC linker installation reactions and the turn-on of the temperature sensing capability upon these reactions are reported.
The impact of templating and macropores in hard carbons on their properties as negative electrode materials in sodium-ion batteries
Authors: Prykhodska Sofiia , Schutjajew Konstantin , Troschke Erik , Kaberov Leonid , Eichhorn Jonas , Schacher Felix H. , Walenszus Francesco , Werner Daniel , Oschatz Martin
Published: April 2024

Polystyrene spheres are used as sacrificial template in different contents to introduce additional pores into hard-carbon structures from glucose for the application as sodium-ion battery anodes.
GN-z11: The environment of an active galactic nucleus atz  =  10.603
Authors: Scholtz Jan , Witten Callum , Laporte Nicolas , Übler Hannah , Perna Michele , Maiolino Roberto , Arribas Santiago , Baker William M. , Bennett Jake S. , D’Eugenio Francesco , Simmonds Charlotte , Tacchella Sandro , Witstok Joris , Bunker Andrew J. , Carniani Stefano , Charlot Stéphane , Cresci Giovanni , Curtis-Lake Emma , Eisenstein Daniel J. , Kumari Nimisha , Robertson Brant , Rodríguez Del Pino Bruno , Smit Renske , Venturi Giacomo , Williams Christina C. , Willmer Christopher N. A.
Published: April 2024

Recent observations with theJames WebbSpace Telescope (JWST) have further refined the spectroscopic redshift of GN-z11, one of the most distant galaxies identified with theHubbleSpace Telescope, atz = 10.603. The presence of extremely dense gas (> 1010cm−3), the detection of high-ionisation lines and of CII*1335 emission, and the presence of an ionisation cone indicate that GN-z11 also hosts an active galactic nucleus. Further photometric and spectroscopic follow-up demonstrates that it lies in a large-scale, overdense structure with possible signatures of Population III stars in its halo. Surprisingly, Lyαhas also been detected despite the expected largely neutral intergalactic medium at such a redshift. We exploit recent JWST/NIRSpec integral field unit observations to demonstrate that the Lyαemission in GN-z11 is part of an extended halo with a minimum size of 0.8–3.2 kpc, depending on the definition used to derive the halo size. The surface brightness of the Lyαhalo around GN-z11 appears consistent with Lyαhalos observed aroundz ∼ 6 quasars. At the wavelength of Lyαatz ∼ 10.6, we identify three other emission line candidates within the integral field unit field of view with no UV rest-frame counterpart visible in deep images from the JWST/NIRCam. If confirmed, this could be the first evidence that the local region of GN-z11 represents a candidate protocluster core, forming just 400 Myr after the Big Bang. We give a first estimate of the dark matter halo mass of this structure (Mh = 2.96−0.39+0.44 × 1010 M⊙), which is consistent with a Coma-like cluster progenitor.
TOI-4336 A b: A temperate sub-Neptune ripe for atmospheric characterization in a nearby triple M-dwarf system
Authors: Timmermans M. , Dransfield G. , Gillon M. , Triaud A. H. M. J. , Rackham B. V. , Aganze C. , Barkaoui K. , Briceño C. , Burgasser A. J. , Collins K. A. , Cointepas M. , Dévora-Pajares M. , Ducrot E. , Zúñiga-Fernández S. , Howell S. B. , Kaltenegger L. , Murray C. A. , Pass E. K. , Quinn S. N. , Raymond S. N. , Sebastian D. , Stassun K. G. , Ziegler C. , Almenara J. M. , Benkhaldoun Z. , Bonfils X. , Christiansen J. L. , Davoudi F. , de Wit J. , Delrez L. , Demory B.-O. , Fong W. , Fűrész G. , Ghachoui M. , Garcia L. J. , Gómez Maqueo Chew Y. , Hooton M. J. , Horne K. , Günther M. N. , Jehin E. , Jenkins J. M. , Law N. , Mann A. W. , Murgas F. , Pozuelos F. J. , Pedersen P. P. , Queloz D. , Ricker G. , Rowden P. , Schwarz R. P. , Seager S. , Smart R. L. , Srdoc G. , Striegel S. , Thompson S. , Vanderspek R. , Winn J. N.
Published: April 2024

Context. Small planets transiting bright nearby stars are essential to our understanding of the formation and evolution of exoplanetary systems. However, few constitute prime targets for atmospheric characterization, and even fewer are part of multiple star systems.

Aims. This work aims to validate TOI-4336 A b, a sub-Neptune-sized exoplanet candidate identified by the TESS space-based transit survey around a nearby M dwarf.

Methods. We validated the planetary nature of TOI-4336 A b through the global analysis of TESS and follow-up multi-band high-precision photometric data from ground-based telescopes, medium- and high-resolution spectroscopy of the host star, high-resolution speckle imaging, and archival images.

Results. The newly discovered exoplanet TOI-4336 A b has a radius of 2.1 ± 0.1 R⊕. Its host star is an M3.5-dwarf star with a mass of 0.33 ± 0.01 M⊙ and a radius of 0.33 ± 0.02 R⊙, and is a member of a hierarchical triple M-dwarf system 22 pc away from the Sun. The planet’s orbital period of 16.3 days places it at the inner edge of the habitable zone of its host star, which is the brightest of the inner binary pair. The parameters of the system make TOI-4336 A b an extremely promising target for the detailed atmospheric characterization of a temperate sub-Neptune by transit transmission spectroscopy with JWST.
Variation of the stellar initial mass function in semi-analytical models
Authors: Fontanot Fabio , La Barbera Francesco , De Lucia Gabriella , Cecchi Rachele , Xie Lizhi , Hirschmann Michaela , Bruzual Gustavo , Charlot Stéphane , Vazdekis Alexandre
Published: April 2024

Context. In our previous work, we derived the CR-IGIMF, which is a new scenario for a variable stellar initial mass function (IMF) that combines numerical results on the role played by cosmic rays (CR) in setting the thermal state of star-forming gas with the analytical approach of the integrated galaxy-wide IMF (IGIMF).

Aims. In this work, we study the implications of this scenario for the properties of local early-type galaxies (ETG) as inferred from dynamical, photometric, and spectroscopic studies.

Methods. We implemented a library of CR-IGIMF shapes in the framework of the galaxy evolution and assembly (GAEA) model. GAEA provides predictions for the physical and photometric properties of model galaxies and for their chemical composition. Our realization includes a self-consistent derivation of the synthetic spectral energy distribution for each model galaxy, which allows a direct derivation of the mass fraction in the mean IMF of low-mass stars (i.e., the dwarf-to-giant ratio, fdg) and a comparison with IMF-sensitive spectral features.

Results. The predictions of the GAEA model implementing the CR-IGIMF confirm our previous findings: It correctly reproduces both the observed excess of z ∼ 0 dynamical mass (mass-to-light ratio) with respect to spectroscopic (photometric) estimates assuming a universal MW-like IMF, and the observed increase in [α/Fe] ratios with stellar mass in spheroidal galaxies. Moreover, this realization reproduces the increasing trends of fdg and IMF-sensitive line strengths with velocity dispersion, although the predicted relations are significantly shallower than the observed ones.

Conclusions. Our results show that the CR-IGIMF is a promising scenario that reproduces at the same time dynamical, photometric, and spectroscopic indications of a varying IMF in local ETGs. The shallow relations found for spectral indices suggest that either a stronger variability as a function of galaxy properties or additional dependences (e.g., as a function of star forming gas metallicity) might be required to match the strength of the observed trends.
The phase curve of the ultra-hot Jupiter WASP-167b as seen by TESS
Authors: Kálmán Sz. , Derekas A. , Csizmadia Sz. , Pál A. , Szabó R. , Smith A. M. S. , Nagy K. , Hegedűs V. , Mitnyan T. , Szigeti L. , Szabó Gy. M.
Published: April 2024

Context. Ultra-hot Jupiters (UHJs) orbiting pulsating A/F stars represent an important subset of the exoplanetary demographic. They are excellent candidates for the study of exoplanetary atmospheres, and are astrophysical laboratories for the investigation of planet-to- star interactions.

Aims. We analysed the TESS light curve of the WASP-167 system, consisting of an F1V star and a substellar companion on a ~2.02 day orbit.

Methods. We modelled the combination of the ellipsoidal variability and the Doppler beaming to measure the mass of WASP-167b, and the reflection effect to obtain constraints on the geometric albedo, while placing a special emphasis on noise separation. We implemented a basic model to determine the dayside (TDay), nightside (TNight), and intrinsic (TInternal) temperatures of WASP-167b, and put a constraint on its Bond albedo.

Results. We confirm the transit parameters of the planet seen in the literature. We find that a resonant ~2P−1 stellar signal (which may originate from planet-to-star interactions) interferes with the phase curve analysis. After careful and thought-out treatment of this signal, we find Mp = 0.34 ± 0.22 MJ. We measure a dayside temperature of 2790 ± 100 K, classifying WASP-167b as an UHJ. We find a 2σ upper limit of 0.51 on its Bond albedo, and determine the geometric albedo at 0.34 ± 0.11 (1σ uncertainty).

Conclusions. With an occultation depth of 106.8 ± 27.3 ppm in the TESS passband, the UHJ WASP-167b is an excellent target for atmospheric studies, especially those at thermal wavelength ranges, where the stellar pulsations are expected to be less influential.
Unraveling the kinematics of IZw18: A detailed study of ionized gas with MEGARA/GTC
Authors: Arroyo-Polonio A. , Kehrig C. , Iglesias-Páramo J. , Vílchez J. M. , Pérez-Montero E. , Duarte Puertas S. , Gallego J. , Reverte D. , Cabrera-Lavers A.
Published: April 2024

This study offers an in-depth analysis of the kinematic behavior of ionized gas in IZw18, a galaxy notable for its extremely low metallicity and close proximity, utilizing data from MEGARA/GTC. We explored the structure and dynamics of the galaxy through Hα line profiles, applying single and double Gaussian component fittings to create detailed maps of the luminosity, velocity, and velocity dispersion in the main body (MB) and halo regions. Additionally, we retrieved integrated spectra from various galactic regions to achieve a higher signal-to-noise ratio. In the MB, a rotational pattern is evident, yet a secondary, more complex kinematic pattern emerges from the double-component fitting, which is further enriched by the identification of a very broad component. Distinguished by a full width at half maximum of nearly 2000 km s−1 and a wide spatial extension, this component suggests a high-energy outflow and points toward large-scale, nonlocalized sources of high kinetic energy. Additionally, the observed significant velocity differences between the narrow and very broad components imply that these gases may occupy distinct spatial regions. This is potentially explained by high-density gas near the origin of the kinematic input, acting as a “wall” that reflects back the momentum of the gas. Regarding the halos, while the NE halo exhibits a tranquil state with low velocity dispersions, the SW halo presents higher velocities and more complex kinematics, indicative of diverse dynamic interactions. The identification of the very broad component across the MB and the high kinematic complexity in all regions of the galaxy points toward a scenario of widespread and subtle turbulent motion. This nuanced understanding of the kinematic behavior in IZw18, including the interplay of different gas components and the influence of internal structures, enhances our comprehension of the dynamics in blue compact dwarf galaxies. It may provide critical insights into early galaxy formation and the intricate kinematics characteristic of such environments.
The impact of stellar bars on star-formation quenching: Insights from a spatially resolved analysis in the local Universe
Authors: Scaloni Letizia , Rodighiero Giulia , Enia Andrea , Gruppioni Carlotta , Annibali Francesca , Bisigello Laura , Cassata Paolo , Corsini Enrico Maria , Casasola Viviana , Lofaro Cristina Maria , Bianchetti Alessandro
Published: April 2024

Context. Stellar bars are common morphological structures in the local Universe; according to optical and NIR surveys, they are present in about two-thirds of disc galaxies. These elongated structures are also believed to play a crucial role in secular evolutionary processes, because they are able to efficiently redistribute gas, stars, and angular momentum within their hosts, although it remains unclear as to whether they enhance or suppress star formation. A useful tool to investigate this ambiguity is the main sequence (MS) relation, which tightly links stellar mass (M⋆) and star formation rate (SFR).

Aims. The main goal of this work is to explore star-formation processes in barred galaxies in order to assess the relevance of bars in star-formation quenching and whether or not they affect the typical log-linear trend of the resolved MS.

Methods. To this purpose, we carried out a spatially resolved analysis on subkiloparsec (subkpc) scales for a sample of six nearby barred galaxies. We collected multi-wavelength photometric data from far-ultraviolet (FUV) to far-infrared (FIR) from the DustPedia database and applied a panchromatic spectral energy distribution (SED) fitting procedure on square apertures of fixed angular size (8″ × 8″) using the magphys code.

Results. For each galaxy, we obtain the distributions of stellar mass and SFR surface density and relate them in the log Σ⋆ − log ΣSFR plane, deriving the spatially resolved MS relation. Although significant galaxy-to-galaxy variations are in place, we infer the presence of a common anti-correlation track in correspondence with the bar-hosting region, which shows systematically lower SFRs. This central quiescent signature can be interpreted as the result of a bar-driven depletion of gas reservoirs and a consequent halting of star formation. Our findings appear to support an inside-out quenching scenario.
The asteroseismic imprints of mass transfer
Authors: Wagg Tom , Johnston Cole , Bellinger Earl P. , Renzo Mathieu , Townsend Richard , de Mink Selma E.
Published: April 2024

We present new simulations investigating the impact of mass transfer on the asteroseismic signals of slowly pulsating B stars. We used MESA to simulate the evolution of a binary star system and GYRE to compute the asteroseismic properties of the accretor star. We show that, compared to a single star of the same final mass, a star that has undergone accretion (of non-enriched material) has a significantly different internal structure, which is evident in both the hydrogen abundance profile and the Brunt-Väisälä frequency profile. These differences result in significant changes in the observed period spacing patterns, implying that one may use this as a diagnostic to test whether a star’s core has been rejuvenated as a result of accretion. We show that it is essential to consider the full multimodal posterior distributions when fitting stellar properties of mass-gainers to avoid drawing misleading conclusions. Even with these considerations, stellar ages will be significantly underestimated when assuming single star evolution for a mass-gainer. We find that future detectors with improved uncertainties would rule out single star models with the correct mass and central hydrogen fraction. Our proof of principle analysis demonstrates the need to further investigate the impact of binary interactions on stellar asteroseismic signals for a wide range of parameters, such as the initial mass, the amount of mass transferred, and the age of the accretor star at the onset of mass transfer.
Wear resistance of self-sharpening blades of the tillage cultivator pointed tines
Authors: Irgashve Amirkul , Tulaganova Laziza
Published: April 2024

The paper studies the wear of the working surfaces of the cultivator’s pointed paw caused by multiple deformations by solid particles with high abrasiveness and mechanical properties of the soil. The main purpose of the study is to develop a methodology for determining the wear resistance of self-sharpening cutters of the cultivator’s pointed paws. Factors influencing the traction of working bodies and causing wear of working surfaces have been identified. The studies can be of interest to the specialists involved in tillage.
Crushing of abrasive particles in gearbox oil of tractors operating in dusty environmental conditions
Authors: Irgashev Amirqul , Egamberdiyeva Nargiza
Published: April 2024

This paper investigates the factors affecting the strength of abrasive particles in tractor gearbox oil operating in dusty conditions. The study focuses on gearboxes with constant mesh gears, categorized into two types based on torque transmission. The research aims to determine the degree of activity of abrasive particles influencing gear teeth wear resistance. A methodology for calculating the possibility of crushing abrasive particles based on their concentration, size, and strength is proposed. The influence of normal force arising from friction torque, rolling bearings, and oil agitation on abrasive particles is also examined. The findings indicate that when gear transmission does not transmit torque, the normal force does not lead to abrasive particle crushing, resulting in high wear capacity in the gearbox oil. However, under the influence of normal force from the torque transmitted by the internal combustion engine, abrasive particles in the tooth contact zone are crushed, reducing their wear capacity. The study’s results contribute to understanding the factors affecting abrasive particle strength in tractor gearboxes operating in dusty conditions, providing insights into improving system design and operation for enhanced durability and efficiency.
Operating features of a small capacity grain grinder with a hex rotor for agricultural farms
Authors: Alijanov Djapbar , Turaev Shukhrat , Atakhanov Alisher , Sakhrov Vladimir
Published: April 2024

This article emphasizes the essential need for technical solutions in small-scale electromechanization tailored for private and small farms to efficiently manage labor-intensive tasks related to caring for farm animals and poultry. The focus is on utilizing single-phase electric motors of low power known for their simple and reliable design, available at a competitive market price. The paper introduces a design and technological diagram, structure, and operational principles of a versatile rotary grain crusher specifically engineered for grinding grain feed. The study gives a theoretical analysis of grain deformation processes within the grain crusher and the movement of grains within the working chamber. Through a concise theoretical examination of the machine’s working chamber, the research validates the potential of the proposed design and technological scheme for the grain feed grinder. This analysis underscores the machine’s promise in delivering the desired quality of the technological process while significantly reducing specific energy consumption compared to existing production models.
Influence of a flat disc on the rectilinear stable motion of the unit of tillage machines
Authors: Kuziev Ulug’bek , Khudayarov Berdirasul , Hasan Rizvi Aqeel , Rakhimov Yunus , Eshchanova Guzal , Joraeva Mukaddas , Usmonova Dilbar
Published: April 2024

The article discusses the design and operation of a combined unit’s flat disk, which is installed within the unit. The study focuses on the torques caused by forces acting on the unit’s working parts and the conditions for their balancing. The depth at which the flat disk enters the soil and the required diameter to meet this requirement are also presented. The article includes the results of theoretical and experimental studies to determine the shape and area of the disk segment, where the disk’s diameter must be at least 45 cm and the depth of its penetration into the soil is within 14-15 cm.
Using modern technologies to improve the vegetable cultivator
Authors: Norchayev D. R. , Gaybullyev B. Sh. , Khayitov A. N. , Khusainov B. S. , Khudaykuliev A. A.
Published: April 2024

This paper explores the selection of high-yielding potato varieties suitable for various soil and climatic conditions, the use of modern scientific technologies in their cultivation, the current state and significance of potato cultivation in the soil and climatic conditions of the Republic of Uzbekistan, and the importance of employing specific techniques such as a motoblock for potato cultivation in homesteads or small farms. The paper also presents the results of theoretical and experimental studies conducted on the study of the grinding angle of the cultivator softener paw. The research findings suggest that the optimal grinding angle for the vegetable cultivator softener claw should be within the range of 25º-30º, ensuring the necessary soil quality and minimal resistance of the working body. This study highlights the importance of selecting appropriate potato varieties and utilizing modern scientific technologies for successful potato cultivation in Uzbekistan.
LogNNet Neural Network Application for Diabetes Mellitus Diagnosis
Authors: Izotov Y. A. , Huyut M. T. , Velichko A. A.
Published: April 2024

The paper presents a LogNNet neural network algorithm for diabetes mellitus diagnosing based on a public dataset. The study used 100 thousand records of patient conditions. Model quality was evaluated using the Matthews Correlation Coefficient metric (MCC). The LogNNet neural network model showed high accuracy (MCC=0.733) in diabetes mellitus recognition. A highly positive relationship between HbA1c level and glucose level in the disease diagnosing was found using the LogNNet model. It has been observed that evaluating these variables together is much more effective than their individual effects in diagnosing the disease.
Sustainable development and biological wealth
Authors: Narzullaev O.
Published: April 2024

This article explores the important relationship between biodiversity and socio-economic dynamics. Through scientific and theoretical analysis, the author explores the multifaceted impact of biodiversity on various aspects of society and economy. By exploring the complex interplay between ecological systems and human activities, the paper illuminates the profound effects of biodiversity loss or conservation efforts on livelihoods, industry, and global sustainability. In addition, the paper provides valuable insights into potential strategies for enhancing biodiversity conservation while promoting socio-economic development. This comprehensive review contributes greatly to the ongoing debate about the importance of biodiversity conservation for the well-being of present and future generations.
The use of humic preparations made on the basis of natural materials as one of the methods of rational use of natural resources
Authors: Zaitsev Fedor , Seregina Inga
Published: April 2024

The research has studied the effect of humic preparations made on the basis of humified hemp bonfires on the yield and formation of productivity elements of spring soft wheat of the Ester variety. It has been studied that the manufacture of humic preparations from plant residues as a natural material can be one of the methods of rational use of natural resources. The effective action of various complexes of humic preparations in the cultivation of spring wheat has been shown. An increase in the yield of spring wheat plants is shown as a result of improving the processes of forming the structure of plant productivity. The greatest effect was shown by preparations in combination with trace elements such as manganese and selenium.
Molecular simulation of competing sorption of U(VI) on the surface of clay and mineral wastes
Authors: Sharafutdinov Ulugbek , Razhabboev Ibodulla , Kadirova Zukhra , Nusretov Rafael , Daminova Shakhlo , Koldarov Albert , Abdurakhmonov Odil
Published: April 2024

In-situ uranium extraction technology, nuclear fuel processing, water purification require detailed study of sorption process of U(VI) and some compete coxisting ions onto clay and waste materials. The Monte-Carlo method used for modeling of the U(VI), Al(III), Fe(II)/Fe(III) sorption on the surface of the clay materials (vermiculite, kaolinite, illite, palygorskite, biotite, montmorillonite, nontronite) and mineral wastes (zincite, franklinite) which are capable to effective sorption of U(VI) on the mineral surfaces. The molecular modeling used different species (UO22+, UO2SO4, UO2(SO4)22−, AlSO4+, Al(SO4)2−, FeSO4−) in acidic sulfate solutions (Н2SO4, НSO4−, SO42−). Different sorption energy values indicate chemical nature of the adsorption process with predominant sorption of uranium ions (UO22+ and UO2(SO4)22−) compared with Fe/Al ion species.
Biodiversity of ornifauna on the territory of the Chograisky Reserve
Authors: Stepanenko Elena , Bezgina Yuliya , Maznitsyna Lubov , Khalikova Valeriya , Sharipova Olga
Published: April 2024

The article is devoted to the biodiversity of the ornifauna on the territory of the Chograisky Reserve. It is noted that the reserve is a center of attraction for a large number of waterfowl and, first of all, rare and endangered birds. It is shown that the reserve is geographically isolated and birds tend to water bodies located on the paths of seasonal bird migrations. Information on the biodiversity of bird species is presented. Of the vertebrates found in the Reserve, birds are the most representative in terms of species composition. The total number of bird species registered here is about 90 species. Taking into account biotic links of birds with water bodies, such groups as waterfowl, near-water birds and occasional birds were identified. Depending on the nature of nesting, method of feeding and degree of attachment to a water body in the development cycle, the largest number of species are surface waterfowl and diving species. birds are indicators of environmental conditions. High indicators of species diversity indicate stability and favorability of bird habitat factors on the territory of the Reserve. At present, a fairly stable system of bird communities has been formed in the area.
A study of the effect of changes in seed comb construction on the quality of cotton seed
Authors: Mamasharipov Abdunabi , Esanova Shazoda , Satvoldiyev Azizbek , Mamasharipov Saidakbar , Kasimova Dilafruz
Published: April 2024

In Uzbekistan, cotton is a significant agricultural product, serving as raw material for the textile industry and oil factories. Ensuring the quality of cotton fiber and seed is crucial, and this study investigates the factors affecting seed quality during cotton processing. The focus is on the working chamber of the ginning machine, which separates fiber from seed. The study examines the effects of seed comb tooth shape and angle relative to the horizon on seed quality. The research identifies factors causing a decrease in seed quality during ginning and proposes changing the shape of seed comb teeth to mitigate this issue. The study also investigates the effect of seed comb location on seed quality and recommends using seed combs with additional slits to accelerate the exit of fiber-picked seeds from the working chamber. This approach ensures high-quality cotton seed suitable for oil plants and seed planting in fields. The study’s findings contribute to improving cotton processing and ensuring the quality of cotton seed in Uzbekistan.
Potato microclonal propagation method in a temporary immersion bioreactor
Authors: Sukhoparov Alexander , Zakharenko Alexander , Fedorova Olga
Published: April 2024

A promising and efficient approach to obtaining a genetically pure and identical plant to a given explant is through microclonal propagation. This method pre-determines the reproduction of plants by managing, controlling, and regulating the parameters of external and internal conditions that influence the accelerated reproduction of cultivated plants. The main methods for implementing the accelerated reproduction of cultivated plants are propagation in a closed external environment using specialized nutrient solutions and the use of bioreactors with temporary immersion of plants. The process of reproducing cultivated plants, specifically potatoes, using temporary immersion bioreactors allows for the use of automated monitoring and control systems based on robust control systems. This increases productivity and ensures the quality of the reproduced explants. Research has led to the development of experienced statisticians who have established the impact of individual parameters on the management of plant reproduction on their quality indicators. The reliability of the study is ensured by a large sample size (over 200 objects), parametric statistics, and the use of group theory to estimate plant reproduction parameters.
Formation, morphology and mechanical composition of meadow-alluvial soils in the Jizzakh desert
Authors: Kholboev Bakhrom E. , Japakov Norboy B. , Rakhmonov Ikrom A. , Akhunboboyev Mamur M. , Oblokhlov Muzaffar
Published: April 2024

This paper explores the origins, formation processes, properties, and characteristics of meadow-alluvial soils found in the Jizzakh desert, as well as their morphological structure. The article delves into the role of soil-forming factors, the conditions of their formation, and the significance of parent rocks and deposits in shaping the mechanical structure of the soil. The granulometric composition of meadow-alluvial soils, including the quantity of dust and clay particles and the total amount of microaggregates, is examined. The mechanical composition of arable and sub-arable soils is described, along with the lithological structure and structural composition of the salt profile.
Development of self-consolidating concretes based on recycled aggregates: Effect of parent concrete strength
Authors: Kamar Dorbani , Zohra Melais Fatma , Sacia Kirane , Dallel Draghmia , Noureddine Arabi
Published: April 2024

Self-consolidating concrete is a recent type of highly fluid concrete. The high paste concentration ensures excellent rheological behavior. Concrete includes can be selected with durability aims in mind, considering the severe conditions to which the concrete will be exposed. However, the irregularity of recycled aggregates (initial properties unknown from the old concrete) leads to a need for more knowledge of durability indicators. This research is an experimental evaluation of the characteristics of SCC made with recycled aggregates and sand whose initial parent concrete strength was specified. Three ranges of parent concrete strength were chosen (20 to 30 MPa, 35 to 45 MPa, and above 50 MPa). The main objective is to study the effect of introducing recycled concrete aggregates on the mechanical behavior and durability of SCC (total immersion in water and capillary absorption). The test specimens were analyzed after 28 days of curing. The findings demonstrate increased durability and mechanical behavior were achieved using recycled aggregates with high strength in the parent concrete. However, the mechanical strength and durability of SCCs are reduced when recycled concrete aggregates with low parent concrete strength (20 to 30 MPa) are used in the mix.
Damage Detection and Condition Assessment of Civil Engineering Structures Using Structural Health Monitoring
Authors: Raheem Shehata E. Abdel
Published: April 2024

Damage identification is critical in evaluating the condition and performance of the existing civil infrastructure. This requires not just routine or critical event-based inspections, but rather a means of continuous monitoring of a structure to provide an assessment of changes as a function of time and an early warning of an unsafe condition using real-time data. Health monitoring plays an important role in the construction and maintenance of the infrastructure. It employs in situ, continuous, or regular measurements and analyses of key structural and environmental parameters under the operating conditions to identify if a damage has occurred, define its location, and estimate its severity, evaluate its consequences on the residual life of the structure also to provide warning of impending abnormal states or accidents to avoid casualties and to inform maintenance and rehabilitation decisions. SHM takes advantage of the new technologies in sensing, instrumentation, communication, and modelling to integrate them into an intelligent system. Structural Health Monitoring for civil structures is becoming increasingly popular in Europe and worldwide because of the opportunities that it offers in the fields of construction management and maintenance. Reduction of inspection costs, research, with the possibility to better understand the behaviour of structures under dynamic loads, seismic protection, observation, in real or near real-time, of the structural response and of evolution of damage, so that it is possible to produce post-earthquake scenarios and support rescue operations, are the main advantages related to the implementation of such techniques.
Offenlegung eigener Krisen- und Behandlungserfahrungen von
Mitarbeitenden psychiatrischer Einrichtungen in Berlin und Brandenburg – eine
ungenutzte Ressource zum Abbau von Stigma?
Authors: von Peter Sebastian , Ponew Angel , Strelen Anna , Lust Christian , Speerforck Sven , Stützle Stefan
Published: April 2024

Ziel Diese Arbeit ist Teil einer Studie, die eigene Krisen- und
Behandlungserfahrungen (=EKB) von Mitarbeitenden psychiatrischer Kliniken in
Berlin und Brandenburg untersucht. Sie folgt der Frage, warum psychiatrische
Fachkräfte ihre EKB (nicht) offenlegen und wie sie diese Offenlegung
erleben.

Methode In einer Online-Befragung wurden 182 psychiatrische Fachkräfte
nach der Offenlegung ihrer EKB im Arbeitskontext befragt. Die Daten wurden
deskriptiv und analytisch ausgewertet.

Ergebnisse Die Befragten legten ihre EKB vor allem gegenüber Vorgesetzten
und nahestehenden Kolleg*innen offen. Sie haben positive, im Einzelfall aber
auch gravierende Erfahrungen gemacht. Zentrale Gründe gegen eine Offenlegung
waren die Befürchtungen, sich angreifbar zu machen und die berufliche Identität
zu gefährden, sowie Scham.

Schlussfolgerungen Die Offenlegung von EKB ist nicht immer die richtige
Strategie für Mitarbeitende psychiatrischer Einrichtungen. Gleichzeitig kann sie
als Mittel verstanden werden, um verinnerlichtes und öffentliches Stigma zu
verringern.