In this research, the impact of shoulder width and geometry of gas channel with different structures on proton exchange membrane (PEM) has been investigated using numerical method. 3D, non-isothermal was used with single straight channel geometrywhile maintaining the same boundary conditions and reaction area with addition of humidification for anode and cathode. Our study showed that an ellipt...

most previous laboratory studies of local scour at bridge abutments were performed in rectangular channels in which the distributions of flow velocity and bed shear stress were considered uniform in the transverse direction. in reality however, bridge abutments are usually located in the floodplain zone of rivers where velocity and shear stress distributions are directly affected by the lat...

In the title compound, [Sn(CH(3))(2)(C(3)H(3)N(2)S(3))(2)], the Sn(IV) atom is coordinated within a C(2)N(2)S(2) donor set that defines a skew-trapezoidal bipyramidal geometry in which the methyl groups lie over the weakly coordinated N atoms. Two independent mol-ecules comprise the asymmetric unit, each of which lies on a mirror plane that passes through the C(2)Sn unit.

The dithio-carbamate anions in the title compound, [Sn(C(4)H(9))(2)(C(5)H(10)NS(2))(2)], chelate to the Sn(IV) atom, which is six-coordinated in a skew-trapezoidal-bipyramidal geometry. The mol-ecule lies across a twofold rotation axis. The crystal studied was a non-merohedral twin, the ratio of the twin components being 0.82 (1):0.18 (1).

In the title compound, [Sn(CH(3))(2)(C(5)H(3)N(2)O(2))(2)], the Sn(IV) atom is twice N,O-chelated by two pyrazine-2-carboxyl-ate ligands. The distorted six-coordination is completed by two tin-bound methyl C atoms. The C(2)N(2)O(2) donor set defines a skewed trapezoidal-bipyramidal geometry. Inter-molecular π-π inter-actions between the pyrazine rings [centroid-centroid distance = 3.8112 (13) Å...

Abstract In embedded systems that necessarily require a steady source of power and (or) attaches to sensor(s), there are opportunities mix small batteries supply such power. The aim this research is optimize the geometry shape piezoelectric cantilevers harvest more Several cantilever geometries with various shapes (rectangular, triangular, circular, trapezoidal cross section) tested in COMSOL m...

Denitrification bioreactors for nitrate removal in agricultural drainage have recently gained attention for their low cost and effectiveness. While research continues to investigate the optimal sizing of these systems, little work has been done on the optimal design geometry (Length to width ratio and cross sectional shape). To address this lack, pilot-scale (1/10th scale) work performed in Iow...

Abstract Continuing advances in computer speed and the availability of user friendly software has made computational fluid dynamics a cost effective compliment and at times alternative to physical modeling in the field of civil engineering hydraulics. Validation of the CFD models for open channel flow conditions remains limited due to the significant cost of obtaining data. Furthermore, once th...

Silting in river is a dynamic process, so it needs to regular desilting. At present, underwater siltation monitoring still its early days and based on experience. This paper puts forward the criterion of discrimination, which flood discharge section decreased by 20%. It used method steady uniform flow open rectangular trapezoidal channel for calculation. The results show that reference values d...