keyword
https://read.qxmd.com/read/38547486/sulfonate-functional-ultramicroporous-materials-with-suitable-pore-size-and-layer-stacked-structure-for-c4-olefins-purification
#1
JOURNAL ARTICLE
Zhensong Qiu, Jiyu Cui, Lifeng Yang, Zhaoqiang Zhang, Xian Suo, Xili Cui, Huabin Xing
Selective recognition of 1,3-butadiene from complex olefin isomers is vital for 1,3-butadiene purification, but the lack of porous materials with suitable pore structures results in poor selectivity and low capacity in C4 olefin separation. Herein, two sulfonate-functionalized organic frameworks, ZU-601 and ZU-602, are designed and show impressive separation performance toward C4 olefins. Benefiting from the suitable aperture size caused by the flexibility of coordinated organic ligand, ZU-601, ZU-602 that are pillared with different sulfonate anions could discriminate C4 olefin isomers with high uptake ratio: 1,3-butadiene/1-butene (207), 1,3-butadiene/ trans -2-butene (10...
March 28, 2024: Journal of the American Chemical Society
https://read.qxmd.com/read/38547140/high-breakthrough-pressure-in-hydrogels-enabled-ultrastable-treatment-of-hypersaline-wastewaters
#2
JOURNAL ARTICLE
Yanni Ma, Zehua Yu, Xifan Fu, Tenghui Qiu, Na Zhao, Huidong Liu, Zhi Huang, Kang Liu
Surface effects of low-surface-tension contaminants accumulating at the evaporation surface easily induce wetting in membrane distillation, especially in hypersaline scenarios. Herein, we propose a novel strategy to eliminate the surface effect and redistribute contaminants at the evaporation interface simply by incorporating a layer of hydrogel. The as-fabricated composite membrane exhibits remarkable stability, even when exposed to solution with salt concentration of 5 M and surfactant concentration of 8 mM...
March 28, 2024: Nano Letters
https://read.qxmd.com/read/38547030/expert-consensus-on-classification-and-performance-in-paralympic-powerlifting-a-delphi-study
#3
JOURNAL ARTICLE
Lorenzo Rum, Ruggero Romagnoli, Aldo Lazich, Tommaso Sciarra, Nicoletta Balletti, Maria Francesca Piacentini, Alessandro Boraschi, Elena Bergamini
BACKGROUND: In Paralympic sports, classification ensures fair competition by grouping athletes based on their impairments. The International Paralympic Committee has provided scientific principles to guide evidence-based classification procedures. In Paralympic Powerlifting (PPO), athletes compete in one class, divided by sex and bodyweight categories, overlooking impairment impact on performance. OBJECTIVE: This study aimed to establish a consensus among international PPO experts regarding classification and performance issues to guide future research...
March 25, 2024: American Journal of Physical Medicine & Rehabilitation
https://read.qxmd.com/read/38546527/introducing-surgical-intelligence-in-gynecology-automated-identification-of-key-steps-in-hysterectomy
#4
JOURNAL ARTICLE
Ishai Levin, Judith Rapoport Ferman, Omri Bar, Danielle Ben Ayoun, Aviad Cohen, Tamir Wolf
OBJECTIVE: The analysis of surgical videos using artificial intelligence holds great promise for the future of surgery by facilitating the development of surgical best practices, identifying key pitfalls, enhancing situational awareness, and disseminating that information via real-time, intraoperative decision-making. The objective of the present study was to examine the feasibility and accuracy of a novel computer vision algorithm for hysterectomy surgical step identification. METHODS: This was a retrospective study conducted on surgical videos of laparoscopic hysterectomies performed in 277 patients in five medical centers...
March 28, 2024: International Journal of Gynaecology and Obstetrics
https://read.qxmd.com/read/38544057/research-on-the-soft-sensing-method-of-indicator-diagram-of-beam-pumping-unit
#5
JOURNAL ARTICLE
Huaijun Zhao, Junping Wang, Tianyu Liu, Yang Yu, Dingxing Hu, Chenxin Cai
An accurate calculation of the indicator diagram of a pumping unit is the key factor in analyzing the performance of an oilfield production and operation and in preparing and optimizing an oilfield development plan. Aiming at the problems of the poor stability of the conventional load-displacement sensor method and the wave equation method, owing to the influence of an alternating load on the force sensor and the difficulty in measuring the crank angle using the electrical parameter method, a new soft sensing method employing the input electrical parameters of the motor and the beam inclination has been proposed to obtain the indicator diagram...
March 11, 2024: Sensors
https://read.qxmd.com/read/38543948/estimating-the-impact-of-vaccination-campaigns-on-measles-transmission-in-somalia
#6
JOURNAL ARTICLE
Niket Thakkar, Ali Haji Adam Abubakar, Mukhtar Shube, Mustafe Awil Jama, Mohamed Derow, Philipp Lambach, Hossam Ashmony, Muhammad Farid, So Yoon Sim, Patrick O'Connor, Anna Minta, Anindya Sekhar Bose, Patience Musanhu, Quamrul Hasan, Naor Bar-Zeev, Sk Md Mamunur Rahman Malik
Somalia is a complex and fragile setting with a demonstrated potential for disruptive, high-burden measles outbreaks. In response, since 2018, Somalian authorities have partnered with UNICEF and the WHO to implement measles vaccination campaigns across the country. In this paper, we create a Somalia-specific model of measles transmission based on a comprehensive epidemiological dataset including case-based surveillance, vaccine registries, and serological surveys. We use this model to assess the impact of these campaign interventions on Somalian's measles susceptibility, showing, for example, that across the roughly 10 million doses delivered, 1 of every 5 immunized a susceptible child...
March 16, 2024: Vaccines
https://read.qxmd.com/read/38543409/tensile-and-interfacial-mechanical-properties-for-single-aramid-iii-fibers-under-dynamic-loading
#7
JOURNAL ARTICLE
Fu Liu, Fangfang Li, Xuelei Li, Haobin Tian, Xudong Lei
In this study, the traditional mini split Hopkinson tension bar (SHTB) was enhanced for the dynamic mechanical performance testing of single fiber/resin interface of composites. Single Aramid III fibers were modified using a polyamine modification treatment. Quasi-static and dynamic tensile tests of modified single Aramid III fibers were conducted using an electronic tensile testing machine and mini SHTB. The test results indicated that the surface modification employing the Catechol-Tetraethylenepentamine (Cat-TEPA) approach had a negligible effect on the tensile mechanical properties of single Aramid III fibers...
March 13, 2024: Polymers
https://read.qxmd.com/read/38543196/exploring-the-effects-of-process-parameters-during-w-o-w-emulsion-preparation-and-supercritical-fluid-extraction-on-the-protein-encapsulation-and-release-properties-of-plga-microspheres
#8
JOURNAL ARTICLE
Heejun Park
In this study, protein-loaded poly(lactic-co-glycolic acid) (PLGA) microspheres were prepared via supercritical fluid extraction of emulsion (SFEE) technology. To understand the correlation between process parameters and the main quality characteristics of PLGA microspheres, a comprehensive prior study on the influence of process variables on encapsulation efficiency (EE), initial drug burst release (IBR), morphology, surface property, and particle size distribution (PSD) was conducted within a wide process condition range of each unit process step, from the double-emulsion preparation step to the extraction step...
February 21, 2024: Pharmaceutics
https://read.qxmd.com/read/38542993/co-2-ch-4-separation-in-amino-acid-ionic-liquids-polymerized-ionic-liquids-and-mixed-matrix-membranes
#9
JOURNAL ARTICLE
Gowri Selvaraj, Cecilia Devi Wilfred
The ability to efficiently separate CO2 from other light gases using membrane technology has received a great deal of attention due to its importance in applications such as improving the efficiency of natural gas and reducing greenhouse gas emissions. A wide range of materials has been employed for the fabrication of membranes. This paper highlights the work carried out to develop novel advanced membranes with improved separation performance. We integrated a polymerizable and amino acid ionic liquid (AAIL) with zeolite to fabricate mixed matrix membranes (MMMs)...
March 19, 2024: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://read.qxmd.com/read/38542601/a-load-adaptive-driving-method-for-a-quasi-continuous-wave-laser-diode
#10
JOURNAL ARTICLE
Yajun Wu, Wenqing Liu, Xinhui Sun, Jinxin Chen, Gang Cheng, Xi Chen, Yibin Fu, Pan Liu, Tianshu Zhang
A quasi-continuous-wave (QCW) laser diode (LD) driver is commonly used to drive diode bars and stacks designed specifically for QCW operations in solid-state lasers. Such drivers are optimized to deliver peak current and voltage pulses to LDs while maintaining low average power levels. As a result, they are widely used in laser processing devices and laser instruments. Traditional high-energy QCW LD drivers primarily use capacitors as energy storage components and pulsed constant-current sources with op-amps and power metal-oxide-semiconductor field-effect transistors (MOSFETs) as their core circuits for generating repeated constant-current pulses...
February 29, 2024: Micromachines
https://read.qxmd.com/read/38541985/barriers-to-adolescents-adherence-to-medical-advice-after-metabolic-bariatric-surgery-a-statistical-analysis
#11
JOURNAL ARTICLE
Evia Shellac, Rachel Lev-Wiesel, Iris Shachar-Lavie, Arie Hadas, Adi Sela, Irit Halifa-Kurzman, Adi Bar-Eyal, Shlomit Shalitin, Dragan Kravarusic, Osher Cohen, Simona Tyroler, Orly Lavan, Silvana Fennig
Background: Adolescent obesity has markedly increased worldwide, and metabolic bariatric surgery is an effective treatment option. A major predictor of the outcomes of this procedure is adherence to post-surgery lifestyle changes and medical recommendations. While adolescents generally have more difficulty adhering to medical advice than adults, their failure to do so could adversely affect their physical and psychological health, the cost-effectiveness of medical care, and the results of clinical trials. To our knowledge, this is the first attempt to identify the characteristics associated with the adherence of adolescents and their families to medical advice after bariatric surgery...
March 19, 2024: Journal of Clinical Medicine
https://read.qxmd.com/read/38541553/the-influence-of-corrosion-processes-on-the-degradation-of-concrete-cover
#12
JOURNAL ARTICLE
Zofia Szweda, Artur Skórkowski, Petr Konečný
In this work, two methods were used to accelerate the corrosion of concrete. In the first method, chloride ions were injected into the concrete using the migration method. The moment of the initiation of the corrosion process was monitored using an electrochemical method of measuring polarization resistance. In the next step, the corrosion process was accelerated by the electrolysis process. Changes on the sample surface were also monitored using a camera. In the second method, the corrosion process of the reinforcing bar was initiated by the use of the electrolysis process only...
March 19, 2024: Materials
https://read.qxmd.com/read/38541544/effects-of-limiting-the-number-of-different-cross-sections-used-in-statically-loaded-truss-sizing-and-shape-optimization
#13
JOURNAL ARTICLE
Nenad Kostić, Nenad Petrović, Vesna Marjanović, Ružica R Nikolić, Janusz Szmidla, Nenad Marjanović, Robert Ulewicz
This research aims to show the effects of adding cardinality constraints to limit the number of different cross-sections used in simultaneous sizing and shape optimization of truss structures. The optimal solutions for sizing and shape optimized trusses result in a generally high, and impractical, number of different cross-sections being used. This paper presents the influence of constraining the number of different cross-sections used on the optimal results to bring the scientific results closer to the applicable results...
March 18, 2024: Materials
https://read.qxmd.com/read/38541536/investigating-the-dynamic-mechanical-properties-and-strengthening-mechanisms-of-ti-6al-4v-alloy-by-using-the-ultrasonic-surface-rolling-process
#14
JOURNAL ARTICLE
Xuming Zha, Zhi Yuan, Hao Qin, Linqing Xi, Yunwu Guo, Zhilong Xu, Xing Dai, Feng Jiang
The demand for titanium alloy has been increasing in various industries, including aerospace, marine, and biomedical fields, as they fulfilled the need for lightweight, high-strength, and corrosion-resistant material for modern manufacturing. However, titanium alloy has relatively low hardness, poor wear performance, and fatigue properties, which limits its popularization and application. These disadvantages could be efficiently overcome by surface strengthening technology, such as the ultrasonic surface rolling process (USRP)...
March 18, 2024: Materials
https://read.qxmd.com/read/38541496/microstructure-and-mechanical-properties-of-powder-metallurgy-superalloy-joints-welded-by-inertia-friction-welding
#15
JOURNAL ARTICLE
Yongqiang Zhang, Peng Zhao, Yiqi Tong, Honggang Dong, Jun Zhou, Feng Qin, Yanping Bi, Peng Li
In recent years, for the structural characteristics and design requirements of the integral rotor and disc shaft of the integrated engine, the welding quality and mechanical properties of superalloy weldments have received increasing attention. In this paper, inertia friction welding (IFW) of FGH96 alloy was carried out using different welding parameters, and the homogeneous connection of FGH96 alloy hollow bars was successfully realized. The microstructure evolution, mechanical properties and fracture failure of the welded joints at room and high temperatures were investigated...
March 14, 2024: Materials
https://read.qxmd.com/read/38541449/degradation-of-rc-columns-under-combined-exposure-to-axial-loading-stray-currents-and-chloride-ingress
#16
JOURNAL ARTICLE
Igor Lapiro, Rami Eid, Konstantin Kovler
Coastal regions, home to a significant portion of the world's population, confront a formidable challenge: the corrosive impact of chloride-rich environments on vital infrastructure. These areas often host essential transportation systems, such as trains and metros, reliant on pre-existing electrical infrastructure. Unfortunately, complete isolation of this infrastructure is rarely feasible, resulting in the emergence of stray currents and electrical potentials that expedite corrosion processes. When coupled with conducive mediums facilitating chemical electrocell formation, the corrosion of reinforced concrete elements accelerates significantly...
March 11, 2024: Materials
https://read.qxmd.com/read/38541414/bio-composite-filaments-based-on-poly-lactic-acid-and-cocoa-bean-shell-waste-for-fused-filament-fabrication-fff-production-characterization-and-3d-printing
#17
JOURNAL ARTICLE
Daniela Fico, Daniela Rizzo, Valentina De Carolis, Carola Esposito Corcione
In this study, novel biocomposite filaments incorporating cocoa bean shell waste (CBSW) and poly(lactic acid) (PLA) were formulated for application in Fused Filament Fabrication (FFF) technology. CBSW, obtained from discarded chocolate processing remnants, was blended with PLA at concentrations of 5 and 10 wt.% to address the challenge of waste material disposal while offering eco-friendly composite biofilaments for FFF, thereby promoting resource conservation and supporting circular economy initiatives. A comprehensive analysis encompassing structural, morphological, thermal, and mechanical assessments of both raw materials and resultant products (filaments and 3D printed bars) was conducted...
March 8, 2024: Materials
https://read.qxmd.com/read/38540694/neuroprotective-effects-of-the-nutraceutical-dehydrozingerone-and-its-c-2-symmetric-dimer-in-a-drosophila-model-of-parkinson-s-disease
#18
JOURNAL ARTICLE
Maria Dolores Setzu, Ignazia Mocci, Davide Fabbri, Paola Carta, Patrizia Muroni, Andrea Diana, Maria Antonietta Dettori, Maria Antonietta Casu
Parkinson's disease (PD) is a neurodegenerative disorder characterized by the loss of dopaminergic neurons responsible for unintended or uncontrollable movements. Mutations in the leucine-rich repeat kinase 2 locus contribute to genetic forms of PD. The fruit fly Drosophila melanogaster carrying this mutation (LRRK2-Dm) is an in vivo model of PD that develops motor impairment and stands for an eligible non-mammalian paradigm to test novel therapeutic approaches. Dehydrozingerone (DHZ) is a natural phenolic compound isolated from ginger and presents anti-inflammatory, antioxidant and neuroprotective properties, making it a potential therapeutic target for PD...
February 24, 2024: Biomolecules
https://read.qxmd.com/read/38539840/supercritical-fluid-extraction-of-bioactive-components-from-apple-peels-and-their-modulation-of-complex-i-activity-in-isolated-mitochondria
#19
JOURNAL ARTICLE
Antonella Aresta, Nicoletta De Vietro, Pietro Cotugno, Ciro Leonardo Pierri, Lucia Trisolini, Carlo Zambonin
Supercritical fluid extraction (SFE) was used to extract bioactive compounds from apple ( Malus domestica ) peel waste from three different Italian cultivars. The bioactive fractions were extracted applying a temperature of 60 °C and a pressure of 250 bar for 15 min with 20% ethanol as co-solvent, at a flow rate of 2 mL/min. The total polyphenol (TP), anthocyanin (TA), ascorbic acid (AA), and antioxidant activity contents (TACs) were measured, while chromatographic analyses were performed to highlight the differences between the extracts...
March 1, 2024: Antioxidants (Basel, Switzerland)
https://read.qxmd.com/read/38538652/theoretical-analysis-of-the-effect-of-isotropy-on-the-effective-diffusion-coefficient-in-the-porous-and-agglomerated-phase-of-the-electrodes-of-a-pemfc
#20
JOURNAL ARTICLE
C Pacheco, Romeli Barbosa, A Navarro-Montejo, L C Ordoñez
In polymer membrane fuel cells (PEMFC), the pore microstructure and the effective diffusion coefficient ( <mml:math xmlns:mml="https://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi>D</mml:mi> <mml:mrow><mml:mi>eff</mml:mi></mml:mrow> </mml:msub> </mml:math> ) of the catalytic layer have a significant impact on the overall performance of the fuel cell. In this work, numerical methods to simulate PEMFC catalytic layers were used to study the effect of isotropy ( <mml:math xmlns:mml="https://www...
March 27, 2024: Scientific Reports
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