This work numerically explores the thermal-hydraulic performance of twisted oval tube with three cross sectioned wire coils including circular, equilateral and square in turbulent regime. The effects geometric shape, direction rotation orientations coil's section were also investigated. Polyhedral mesh is adopted water used as working fluid. obtained results are compared those without coils. Our show that using coil together can further enhance heat transfer rate pump consumption while PEC...

Objective The objective of this study is to investigate the causal relationship between gut microbiota and juvenile idiopathic arthritis, identify quantify potential role plasma metabolites as mediators. Methods Using summary-level data from genome-wide association studies, a two-sample Mendelian randomization was conducted involving 131 genus, 1,400 metabolites, arthritis. Additionally, two-step approach employed proportion effect on arthritis mediated by metabolites. Effect estimation...

Abstract Flange connections are widely used in industries such as petrochemicals and nuclear power, where they encounter complex mechanical thermal loads, making them potential sources of leakage. Leakage not only affects the continuity production but can also lead to significant economic personnel losses severe cases. This paper proposes a leakage rate prediction model for flange based on relative compressive deformation gaskets, while accounting effects gasket creep. The parameter values...

Abstract To investigate the thread failure issue of top inlet pipe end a high-pressure polyethylene reactor, fluid-structure interaction (FSI) numerical model was developed for reactor?s pipe. Bidirectional FSI analysis revealed that, although fluid pressure pulsations are primary cause pipeline vibrations, asymmetric secondary flow at double elbows induces out-of-plane structural causing crack locations threaded to deviate out plane. A localized straight segment with threads established,...

With a multi-axial test machine, ratcheting was studied experimentally for pressurized low carbon steel elbows under reversed bending. The maximum strain occurred mainly in the hoop direction at flanks. Hoop found intrados individual specimen. No extrados all tests. Ratcheting rate grew with increase of bending loading level same internal pressure or an load. simulation performed by EPFEA ANSYS which Ohno-Wang and Chen-Jiao-Kim kinematic hardening rules were applied user programing. By...

Abstract Background Paediatric orthopaedics is a significant and difficult for undergraduate students to master. During the COVID-19 pandemic, we used WeChat platform combine advantages offered by problem-based learning (PBL), case-based (CBL) paper review teaching methods establish new blended online model demonstrated its feasibility effectiveness. Objective This study aims demonstrate effectiveness of pedagogical method that uses combines PBL, CBL review. Methods We enrolled 22...

A previous study has reported the oncogenic role of circular RNA (circ)‑ATAD1 in gastric cancer. The aim present was to investigate circ‑ATAD1 acute myeloid leukemia (AML). Bone marrow mononuclear cells were collected from 60 patients with AML and healthy controls, followed by isolation reverse transcription‑quantitative PCR assess expression microRNA (miR)‑34b. subcellular fractionation assay used determine location cells. Furthermore, miR‑34b overexpressed crosstalk between two molecules....

A new concept in cooling hole design Bitter disks that allows for much higher power densities and results considerably lower hoop stresses has been developed successfully tested at the National High Magnetic Field Laboratory (NHMFL) Tallahassee, FL. The shape extreme (up to 12 W/mm/sup 3/) a moderate heat flux of only 5 2/. also reduces stress by about 30-50% making disk compliant radial direction through staggering small width closely spaced elongated holes. Finally, is optimized equal temperature.

The world's first 33 Tesla resistive magnet is being designed and built at the National High Magnetic Field Laboratory in Tallahassee, FL. Completion of expected fourth quarter 1995. It will produce a peak on-axis field greater than Teslas 32 mm warm bore while consuming 20 megawatts power. This consists two small concentric parallel coils (poly-Bitter) series with larger Bitter coils. Details optimization calculations resulting design construction are presented.

Although most thin walled cylinders under external pressure are stiffened by rings with the same dimension, it is believed that combination of large and small stiffening helpful to lightweight design structures. In this paper, eigenvalue buckling analysis has been done study pattern (BP) critical Pcr rings. It found there a map patterns for different ring combinations. Three BPs appear as cylinder together both (BP-I), but without (BP-II), finally, (BP-III). region BP-I BP-II, values...

Abstract A multifunctional epoxy tetraglycidyl dibenzmethyldiamine and triglycidyl benzylamine were blended, respectively, into impregnation resin, which mainly consists of diglycidyl ether bisphenol (DGEBA) acid anhydride hardener. This resin is expected to impregnate HT‐7U superconducting Tokamak toroidal field coils improve the fracture toughness DGEBA–acid at cryogenic temperature. However, experimental results reveal that lap shear strengths decrease remarkably both ambient liquid...

The ratcheting behavior was studied experimentally for Z2CND18.12N elbow piping under cyclic bending and steady internal pressure. Dozens of plasticity models structural responses simulations were used in the paper. four models, namely, Bilinear (BKH), Multilinear (MKIN/KINH), Chaboche (CH3), already available ANSYS finite element package. Advanced such as, modified (CH4), Ohno-Wang, Abdel Karim-Ohno Karim-Ohno, implemented into simulating experimental responses. Results from simulation...

We describe in detail a 30 Tesla, 32 mm warm bore, 15 MW resistive magnet which was put into operation at the National High Magnetic Field Laboratory Tallahassee, FL March 1995. The consists of three concentric axially-cooled Bitter stacks connected electrically series. This employs substantial new development technology allows high current densities without usually accompanying stresses. Details optimization, design, construction, testing and are presented. also report on operating...

Any contactor bounce is undesirable since this causes arcing which shortens the life of contacts when close. The rebounds and closing speeds are different with phase angle electromagnetic coil voltage switching on contactors This paper discussed determination best on. Taking as optimization variable, velocities three armature objectives, taking moving lower than their worst values restrictions, model was established. Game theory introduced adopted to solve multi-objectives problem. CJ20 AC...

Due to its superior corrosion resistance and low coefficient of friction, polytetrafluoroethylene (PTFE) is extensively used in the aerospace, machinery, chemical, pharmaceutical industries. However, PTFE components encounter complex alternating stresses, resulting ratchet creep, which will affect component’s reliability. It therefore necessary clarify PTFE’s creep. In this paper, uniaxial tensile creep experiments were conducted at five temperatures on a dog-bone specimen. At various stress...

Construction of the NHMFL hybrid magnet is complete. The resistive insert was tested to full current without background field from superconducting on May 17, 1999. Tests combined system have been scheduled for October fits into 616 mm bore 14 T outsert magnet. consists a five coil, axially cooled Florida-Bitter design. two innermost coils are electrically in parallel and this pair series with other four coils. design uses disks made Cu-Ag, Cu-Be, Cu-Zr Cu sheet heavily based upon high...