3,742 research outputs found
Fermion Scattering at a Phase Wave
We study fermion reflection at a phase wave which is formed during a bubble
collision in a first order phase transition. We calculate the reflection and
the transmission coefficients by solving the Dirac equation with the phase wave
background. Using the results we analyze the damping and the velocity of the
wave.Comment: 19 pages. Standard Latex file with 2 tex figure
Stochastic Processes and the Dirac Equation with External Fields
The equation describing the stochastic motion of a classical particle in
1+1-dimensional space-time is connected to the Dirac equation with external
gauge fields. The effects of assigning different turning probabilities to the
forward and the backward moving particles in time are discussed.Comment: 9 pages, 1 figure, scalar parts eliminate
Incidental finding of a Sertoli-Leydig cell tumor in a postmenopausal woman with complex endometrial hyperplasia
Sertoli-Leydig cell tumors (SLCTs) arise from the non-germ cell component of the ovary and typically present in young women with evidence of hyperandrogenism such as precocious puberty, amenorrhea, hirsutism and virilization. It is very rare accounting for less than 0.2% of all ovarian tumors, and because of the rarity, no standardized treatment approach has reached a consensus. The prognosis is generally good with complete reversion of symptoms after surgery, although some cases have been reported to be malignant. Recently the need for DICER1 mutations testing in paediatric patients has been emphasized for the surveillance of possible synchronous tumors and affected family members. Authors present here a case of Sertoli-Leydig cell tumor incidentally found while performing a hysterectomy with bilateral salpingo-oophorectomy in a postmenopausal woman with endometrial hyperplasia that caused intractable vaginal bleeding
Organizing Pneumonia by Paragonimiasis and Coexistent Aspergilloma Manifested as a Pulmonary Irregular Nodule
Organizing pneumonia by paragonimiasis and coexistent aspergilloma as a pulmonary nodule is a rare case of lung disease. Its radiographic or CT feature has not been described before in the radiologic literature. We present organizing pneumonia by paragonimiasis and coexistent aspergilloma manifested as a pulmonary irregular nodule on CT
Predict to Detect: Prediction-guided 3D Object Detection using Sequential Images
Recent camera-based 3D object detection methods have introduced sequential
frames to improve the detection performance hoping that multiple frames would
mitigate the large depth estimation error. Despite improved detection
performance, prior works rely on naive fusion methods (e.g., concatenation) or
are limited to static scenes (e.g., temporal stereo), neglecting the importance
of the motion cue of objects. These approaches do not fully exploit the
potential of sequential images and show limited performance improvements. To
address this limitation, we propose a novel 3D object detection model, P2D
(Predict to Detect), that integrates a prediction scheme into a detection
framework to explicitly extract and leverage motion features. P2D predicts
object information in the current frame using solely past frames to learn
temporal motion features. We then introduce a novel temporal feature
aggregation method that attentively exploits Bird's-Eye-View (BEV) features
based on predicted object information, resulting in accurate 3D object
detection. Experimental results demonstrate that P2D improves mAP and NDS by
3.0% and 3.7% compared to the sequential image-based baseline, illustrating
that incorporating a prediction scheme can significantly improve detection
accuracy.Comment: ICCV 202
Structure-Property Relationship of Amyloidogenic Prion Nanofibrils
The structure and its property for the prion nanofibrils, which exhibit self-assembled steric zipper, amyloid fibrils, are described in this chapter. There is the belief of origin for the infectiousness of the prion can be its molecular structure. It is due to the amyloid toxicity, which is related to its beta sheet rich molecular structure and self-aggregated long fibrils. There is evidence that the difference between PrPc and PrPsc is transitioned beta sheet from alpha helix to self-assemble and then to the amyloidogenic fibrils. Therefore, the scope of this chapter is the amyloidogenic structural characteristics of prion fibrils and its relationship to the property. The molecular structural characteristics can be changed by properties such as affinity, toxicity, infectivity, and so on, so this is a key factor to understand the origin of prion disease and develop the therapeutic strategy. One of the main properties of amyloid fibrils that we want to describe here is mechanical property such as dynamic property and material property for prion nanofibrils. This chapter can shed light on understanding the infectious characteristics of prion and the relationship of its molecular structures
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