On re-normalization in the theory of weak turbulence in plasmas

The paper compares the methods of re-normalization introduced by the Dupree—Weinstock theory of turbulence with those in the theories of Kadomtsev, Rudakov and Tsytovich. It is shown to what extent they are equivalen

Differential Coded Aperture Single-Snapshot Spectral Imaging

We propose a novel concept of differential coded aperture snapshot spectral imaging (D-CASSI) technique exploiting the benefits of using {-1,+1} random mask, which is demonstrated by a broadband single-snapshot hyperspectral camera using compressed sensing. To double the information, we encode the image by two complementary random masks, which proved to be superior to two independent patterns. We utilize dispersed and non-dispersed encoded images captured in parallel onto a single detector. We explored several different approaches to processing the measured data, which demonstrates significant improvement in retrieving complex hyperspectral scenes. The experiments were completed by simulations in order to quantify the reconstruction fidelity. The concept of differential CASSI could be easily implemented also by multi-snapshot CASSI without any need for optical system modification

Enhancement of CASSI by a zero-order image employing a single detector

Coded aperture snapshot spectral imaging (CASSI) makes it possible to recover 3D hyperspectral data from a single 2D image. However, the reconstruction problem is severely underdetermined and efforts to improve the compression ratio typically make the imaging system more complex and cause a significant loss of incoming light intensity. In this paper, we propose a novel approach to CASSI which enables capturing both spectrally sheared and integrated image of a scene with a single camera. We performed hyperspectral imaging of three different testing scenes in the spectral range of 500-900 nm. We demonstrate the prominent effect of using the non-diffracted image on the reconstruction of data from our camera. The use of the spectrally integrated image improves the reconstruction quality and we observed an approx. fivefold reduction in reconstruction time

Catheter-based renal denervation versus intensified medical treatment in patients with resistant hypertension: Rationale and design of a multicenter randomized study—PRAGUE-15

AbstractCatheter-based renal denervation (RDN) was considered as a promising method for treatment of resistant hypertension and was increasingly being used worldwide. However, there are equivocal results from only two randomized trials studying the effect of such intervention. Thus, additional data from properly designed long-term comparative trials are needed. The PRAGUE-15 trial is designed as an open, prospective, randomized multicenter trial comparing RDN versus intensified medical treatment in patients with resistant hypertension. Patients randomized to the medical treatment group will receive spironolactone in the absence of contraindications. The primary endpoint will be changes in systolic and diastolic pressure during ambulatory blood pressure monitoring (ABPM) from baseline to 6 months. Herein, we describe the trial design and methodology. The strengths of the trial include ABPM (as the objective endpoint), independent outcomes assessment, and therapeutic use of spironolactone