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Study on the crack propagation morphology and initiation law of coal rock under the action of underwater electric pulse.
Sci Rep
January 2025
School of Resources and Civil Engineering, Northeastern University, Shenyang, 110819, China.
Based on the symmetric initiation mechanism of double-wing cracks in coal rock mass induced by high-pressure electro-recoil water pressure, fracturing experiments have been performed on coal rock mass under different water pressures and discharge conditions using high-voltage electric pulse hydraulic fracturing devices. Combined with CT scans, the crack spatial distribution inside the post-break coal rock mass was analyzed and found that the edge of the water injection hole is prone to produce double-wing cracks along the drilling hole diameter. ABAQUS is used to verify the physical test and extend the test conditions, the geometric parameter change, morphological expansion rule and crack initiation mechanism of double-wing crack in coal rock mass under different discharge conditions and ground stress conditions are studied.
View Article and Find Full Text PDFRare occurrence of upper-limb ischaemia necessitating transhumeral amputation following axillary arterial line placement.
BMJ Case Rep
January 2025
Department of Orthopaedic Surgery, Wayne State University School of Medicine, Detroit, Michigan, USA.
Arterial cannulation, commonly performed in the radial artery, is a widely used method for continuous blood pressure monitoring. Occasionally, the axillary artery is used as an alternate site of cannulation. However, complications like occlusion can lead to adverse events and severe outcomes.
View Article and Find Full Text PDFFormation and crystalline structure of spherulites from pea and high amylose maize starches.
Int J Biol Macromol
January 2025
Department of Grain Science and Industry, Kansas State University, Manhattan, KS 66506, USA. Electronic address:
Starch spherulite is a unique form of resistant starch characterized by a spherical structure with crystalline lamellae that are radially oriented and may find applications in delivery of nutrients and bioactives to the lower gastrointestinal tract. Formation of starch spherulites generally requires heating to a high temperature followed by quenching and long crystallization time. The objectives of this study were to gain a deeper understanding of the factors influencing spherulite formation from pea starch (PS) and high-amylose maize starch (HAMS) and investigate if spherulites could be formed by a slow cooling rate and determine the crystalline structure and morphology of the spherulites formed.
View Article and Find Full Text PDFTidal Volume Challenge to Assess Volume Responsiveness with Dynamic Preload Indices During Non-Cardiac Surgery: A Prospective Study.
J Clin Med
December 2024
Second Department of Anesthesiology, Attikon University Hospital, National and Kapodistrian University of Athens, 12461 Athens, Greece.
: The aim of this study is to assess whether changes in Pulse Pressure Variation (PPV) and Stroke Volume Variation (SVV) following a VtC can predict the response to fluid administration in patients undergoing surgery under general anesthesia with protective mechanical ventilation. : A total of 40 patients undergoing general surgery or vascular surgery without clamping the aorta were enrolled. Protective mechanical ventilation was applied, and the radial artery was catheterized in all patients.
View Article and Find Full Text PDFPostprandial Vascular Effects of a High Potassium Meal in Patients with Treated Hypertension.
Nutrients
December 2024
Institute of Medical Science, University of Toronto, 1 King's College Circle, Toronto, ON M5S 1A8, Canada.
Background: There is compelling evidence of an inverse association between potassium intake and blood pressure (BP). A potential mechanism for this effect may be dietary potassium-mediated augmentation of endothelium-dependent relaxation. To date, studies have investigated potassium intake supplementation over several weeks in healthy volunteers with variable results on vascular function.
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