Villemonte's approach: a general method for modeling uniform and non-uniform performance in stepped fishways

Stepped fishways are the most popular solutions to enable the free movement of fish fauna through weirs and dams. Given the flow variation of rivers throughout the year, successful fish migration through stepped fishways relies on the accurate discharge calculation and their modeling under variable scenarios. This study aims to propose a general method for flow and water level calculation of stepped fishways, unifying different findings in specialized literature. To achieve this purpose, the relation defined by Villemonte is used and tested under laboratory and field case studies. This study shows that the hydraulic behavior of a wide range of stepped fishway typologies can be explained based on a single equation, as well as the need of calibration of the coefficients involved in this equation for different subtypes. Furthermore, the proposed method enables the water level modeling under variable boundary conditions, which in turns allows the analysis of stepped fishways hydraulic performance under different river scenarios. The comparison of the hydraulic parameters in the fishways with the physical capacities and preferences of fish will contribute to the fulfillment of their main objective: allow free movement of fish fauna

Ultrasonographic Evaluation of Mammary Tumors in Bitches

WOS: 000263698100014The aim of this study was to characterize the ultrasonographic patterns of benign and malignant mammary tumors and to evaluate the efficacy of ultrasonographic imaging to distinguish benign and malignant tumors in dogs. Shape, margins, width-to-craniocaudal (CC) dimension ratio, echotexture, echogenicity, presence of calcification, presence of pseudocapsule, size (the deepest and longest axis) and acoustic transmission Of tumors were evaluated. The ultrasonography features and the tissue diagnosis of benign tumor were oval or round (80% of masses with this feature were benign), and circumscribed margins (95% were benign). The features most predictive of a malignant tumor diagnosis were spiculated or microlobulated margins (76% of masses with this feature were malignant), and irregular shape (78% were malignant). No differences between the benign and malignant groups for width-to-CC dimension ratio >1.4 were observed. The benign tumors were seen in different distribution of beign hypoechoic (30%), isoechoic (35%) or varied in echogenicity. It was concluded that, the ultrasonography could be an extremely useful tool for the preevaluation of canine mammary gland tumors, especially in relation to the evaluation of tumor size, shape, border irregularity, echotexture, internal echogenicity and acoustic transmission

Post-kidney transplantation external iliac artery stenosis due to vascular clamp: report of a case

We report a case of right external iliac artery stenosis after kidney transplantation surgery caused by vascular clamp application injury. The patient presented with claudication of the ipsilateral lower limb and the lesion was diagnosed angiographically. The patient was treated with endovascular stent placement

Efficiency of Fat Suppression in T1-Weighted Inner Ear Magnetic Resonance Imaging: Multipoint Dixon Method Versus Hybrid Techniques

Background : Temporal bone is a region where fat suppression is difficult due to the in homogeneity of various structures with different molecular properties. Introductio