12,064 research outputs found
Spin-current Seebeck effect in quantum dot systems
We first bring up the concept of spin-current Seebeck effect based on a
recent experiment [Nat. Phys. {\bf 8}, 313 (2012)], and investigate the
spin-current Seebeck effect in quantum dot (QD) systems. Our results show that
the spin-current Seebeck coefficient is sensitive to different polarization
states of QD, and therefore can be used to detect the polarization state of QD
and monitor the transitions between different polarization states of QD. The
intradot Coulomb interaction can greatly enhance the due to the stronger
polarization of QD. By using the parameters for a typical QD, we demonstrate
that the maximum can be enhanced by a factor of 80. On the other hand, for
a QD whose Coulomb interaction is negligible, we show that one can still obtain
a large by applying an external magnetic field.Comment: 6 pages, 8 figure
Management of intractable epistaxis in patients who received radiation therapy for nasopharyngeal carcinoma
To report clinical manifestations, bleeding point localization, and outcomes of management in 16 patients with 16 instances of intractable epistaxis after radiation therapy for nasopharyngeal carcinoma. Retrospective chart review of 16 patients with nasopharyngeal carcinoma (mean age 52.06 ± 14.37 years) with 16 instances of intractable epistaxis during the past 5 years, whose diagnosis was confirmed by angiography (n = 10) or MRI/CT imaging studies and clinical manifestations (n = 6). The mean radiation dose to the affected carotid artery was 101.37 ± 34.85 Gy. Bleeding points were detected in the internal carotid artery (n = 8) or external carotid artery (n = 8). Detachable balloons were used in one affected artery for vascular occlusion; six were treated using an absorbable gelatin sponge (n = 4) or microcoils (diameter 1 mm) (n = 2). Endovascular embolization was successful in seven radiation carotid blowout syndromes with cessation of hemorrhage. One patient underwent external carotid artery ligation and one patient recovered without treatment. The clinical follow-up was 3 months. Therapeutic endovascular embolization of intractable epistaxis is both efficient and safe. It should be considered as the primary treatment modality in intractable epistaxis of nasopharyngeal carcinoma
Topological insulator: a new quantized spin Hall resistance robust to dephasing
The influence of dephasing on the quantum spin Hall effect (QSHE) is studied.
In the absence of dephasing, the longitudinal resistance in a QSHE system
exhibits the quantum plateaus. We find that these quantum plateaus are robust
against the normal dephasing but fragile with the spin dephasing. Thus, these
quantum plateaus only survive in mesoscopic samples. Moreover, the longitudinal
resistance increases linearly with the sample length but is insensitive to the
sample width. These characters are in excellent agreement with the recent
experimental results [science {\bf 318}, 766 (2007)]. In addition, we define a
new spin Hall resistance that also exhibits quantum plateaus. In particular,
these plateaus are robust against any type of dephasing and therefore, survive
in macroscopic samples and better reflect the topological nature of QSHE.Comment: 4 pages, 5 figure
Research And Implementation Of Drug Target Interaction Confidence Measurement Method Based On Causal Intervention
The identification and discovery of drug-target Interaction (DTI) is an
important step in the field of Drug research and development, which can help
scientists discover new drugs and accelerate the development process.
KnowledgeGraph and the related knowledge graph Embedding (KGE) model develop
rapidly and show good performance in the field of drug discovery in recent
years. In the task of drug target identification, the lack of authenticity and
accuracy of the model will lead to the increase of misjudgment rate and the low
efficiency of drug development. To solve the above problems, this study focused
on the problem of drug target link prediction with knowledge mapping as the
core technology, and adopted the confidence measurement method based on causal
intervention to measure the triplet score, so as to improve the accuracy of
drug target interaction prediction model. By comparing with the traditional
Softmax and Sigmod confidence measurement methods on different KGE models, the
results show that the confidence measurement method based on causal
intervention can effectively improve the accuracy of DTI link prediction,
especially for high-precision models. The predicted results are more conducive
to guiding the design and development of followup experiments of drug
development, so as to improve the efficiency of drug development.Comment: 8 pages,11 figure
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