Unconventional superconductivity in heavy-fermion systems appears often near magnetic quantum critical points (QCPs). This seems to be the case also for CeRh2As2 (Tc ≈0.31 K). CeRh2As2 shows two superconducting (SC) phases, SC1 and SC2, for a magnetic field along the c axis of the tetragonal unit cell, but only the SC1 phase is observed for a field along the basal plane. Furthermore, another ordered state (phase I) is observed below T0≈0.48K whose nature is still unclear: Thermodynamic and magnetic measurements pointed to a nonmagnetic multipolar state, but recent µSR and nuclear quadrupole resonance/nuclear magnetic resonance (NMR) experiments have clearly detected antiferromagnetic (AFM) order below T0. Also, quasi-two-dimensional AFM fluctuations were observed in NMR and neutron-scattering experiments above T0. The proximity of a QCP is indicated by non-Fermi-liquid (NFL) behavior observed above the ordered states in both specific heat C(T)/T∝T−0.6 and resistivity ρ(T)∝T. These T dependencies are not compatible with any generic AFM QCP. Because of the strong magnetic-field anisotropy of both the SC phase and phase I, it is possible to study a field-induced SC QCP as well as a phase-I QCP by varying the angle α between the field and the c axis. Thus, by examining the behavior of the electronic specific-heat coefficient C(T)/T across these QCPs, we can determine which phase is associated with the NFL behavior. Here, we present low-temperature specific-heat measurements taken in a magnetic field as high as 21 T applied at several angles α. We observe that the NFL behavior very weakly depends on the field and the angle α, a result that is at odds with observations in standard magnetic QCPs. This suggests a nonmagnetic origin of the quantum critical fluctuations. Published by the American Physical Society 2025

• Book : 111(4)
• Pub. Date : 2025
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Abstract. This work presents a field study measuring aeolian sediment transport and wind profiles across a dune, and provides an approximation of the annual volume of aeolian transport into the dune systems of the East Frisian island of Spiekeroog, using commonly available meteorological data. Aeolian sediment traps were positioned along a transect aligned with the general wind direction during the measurement, starting on the open beach and ending on the back site of a selected dune. Wind profiles were temporarily measured next to four aeolian traps. Using a recent version of an aeolian sediment transport model, the total annual aeolian sediment transport into the dune systems is approximated. Input variables for this model are the time series of shear velocity and surface moisture. These are derived from the wind velocity measured at a height of 10 m and the amount of precipitation in combination with potential evaporation calculated using radiation intensity. The results are compared to volume changes of the beach and dune systems, which are derived from geospatial data. Data from the field study shows, that sediment transport occurs even behind twenty metres of vegetation on top of a dune. Further, the study indicates that the impact of precipitation on aeolian transport reduction can be lower within vegetated areas on a dune compared to the open beach. The approximation of the total annual aeolian transported sediment surpasses the actual volume changes of the dune systems as expected, however this difference varies depending on the compared beach section almost by a factor of five.

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The CP-even fractions (F+) of the decays D0→π+π−π0 and D0→K+K−π0 are measured with a quantum-correlated ψ(3770)→DD¯ data sample collected by the BESIII experiment corresponding to an integrated luminosity of 7.93  fb−1. The results are F+π+π−π0=0.9406±0.0055±0.0033 and F+K+K−π0=0.631±0.014±0.011, where the first uncertainties are statistical and the second systematic. These measurements are consistent with the previous determinations, and the uncertainties for F+π+π−π0 and F+K+K−π0 are reduced by factors of 2.6 and 2.6, respectively. The reported results provide important inputs for the precise measurement of the angle γ of the Cabibbo-Kobayashi-Maskawa matrix and indirect CP violation in charm mixing. Published by the American Physical Society 2025

• Book : 111(1)
• Pub. Date : 2025
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Abstract Introduction Paragangliomas, tumors that arise from extraadrenal chromaffin cells, are rarely found in the mediastinum. It is important to diagnose and remove paragangliomas because of its critical symptoms such as hypertension and can be curable with resection. Clinical Case A 18-year-old man, has no known disease, presented with episodes of palpitations, sweating associated with hypertension.The patient’s blood pressure measured at office was 180/110 mmHg. Electrocardiographic monitoring showed only nonspesific ST-T waves changes. Other secondary causes of hypertension were excluded. Suspecting of pheochromocytoma, 24-hour urinary metanephrine and normetanephrine levels were examined, the normetanephrine level was found to be elevated (1367,78 mcg/24 hour; normal range 88-444), whereas metanephrine level was normal (102,16 mcg/24 hour; normal range 52-341). Plasma metanephrine level was normal (58 ng/L; normal range 0-90).However plasma normetanephrine level was elevated (163,1 ng/L; normal range 0-90).The ratio of serum aldosterone level to the plasma renin activity was normal. 1 mg dexamethasone suppression test was normal. There was no adrenal mass in the abdominal MRI, but a mass measuring 4,3x 3,2 cm was seen in the right paravertebral area of the thorax in the area included in the cross-sections. In Ga-68 Dota-tate positron emission tomography (PET),a mass lesion of 43x30 mm in size, showing intense somatostatin receptor expression (SUV-max: 31.9) was detected in the right paravertebral area at the level of the 8th thoracic vertebra, which was evaluated as paraganglioma. For more than 1 month, the patient had been prepared for the surgery administering combination doxazosine and propronol after the treatment with only doxazosin. The patient was consulted to the thoracic surgery department. Phentolamine was provided before surgery. The mass was resected via thoracotomy. In histological evaluation, widespread zelballen and pseudorosette structures were observed. There was no comedonecrosis, and there was no vascular and capsular invasion. Ki 67 proliferation index was 4-5 %. On immunohistochemical staining, the mass tested positive for synaptophysin and chromagranin and negative for cytokeratins. One month after surgery normetanephrine (147,85 mcg/24h; normal range: 88-444) and metanephrine (102,16 mcg/24 h; normal range 52-341) levels were normal. The patients blood pressure was stabilized at 120/70 mmHg and heart rate was 80 bpm. In the genetic analysis of the patient, the NDUFA6 gene was detected and mitechondrial complex 1 deficiency was associated with nuclear type 33 disease and the patient was accepted as a carrier. Screening with 24 hour urine metanephrine and normetanephrine was recommended to patient’s family members. Conclusion Since, there are no definite microscopic criteria for the distinction between benign and malignant tumors, radical excision is necessary. The symptoms are curable with resection of tumor, long term follow up for recurrence is important.Figure 1:Gallium-68 Dota-Tate PETShowing the mass(SUV-max:31.99)

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Objective: This study evaluated the effect of an accelerated three-dimensional (3D) T1-weighted pediatric brain MRI protocol using a deep learning (DL)-based reconstruction algorithm on scan time and image quality.Materials and Methods: This retrospective study included 46 pediatric patients who underwent conventional and accelerated, pre- and post-contrast, 3D T1-weighted brain MRI using a 3T scanner (SIGNA Premier; GE HealthCare) at a single tertiary referral center between March 1, 2023, and April 30, 2023. Conventional scans were reconstructed using intensity Filter A (Conv), whereas accelerated scans were reconstructed using intensity Filter A (Fast_A) and a DL-based algorithm (Fast_DL). Image quality was assessed quantitatively based on the coefficient of variation, relative contrast, apparent signal-to-noise ratio (aSNR), and apparent contrast-to-noise ratio (aCNR) and qualitatively according to radiologists’ ratings of overall image quality, artifacts, noisiness, gray-white matter differentiation, and lesion conspicuity.Results: The acquisition times for the pre- and post-contrast scans were 191 and 135 seconds, respectively, for the conventional scan. With the accelerated protocol, these were reduced to 135 and 80 seconds, achieving time reductions of 29.3% and 40.7%, respectively. DL-based reconstruction significantly reduced the coefficient of variation, improved the aSNR, aCNR, and overall image quality, and reduced the number of artifacts compared with the conventional acquisition method (all P < 0.05). However, the lesion conspicuity remained similar between the two protocols.Conclusion: Utilizing a DL-based reconstruction algorithm in accelerated 3D T1-weighted pediatric brain MRI can significantly shorten the acquisition time, enhance image quality, and reduce artifacts, making it a viable option for pediatric imaging.

• Book : 26(2)
• Pub. Date : 2025
• Page : pp.180-192
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