Protecting endangered species has been an important issue in ecology. We derive a reaction-diffusion model for population one-dimensional bounded habitat, where the is subjected to strong Allee effect its natural domain but obeys logistic growth protection zone. establish conditions persistence and extinction via principal eigenvalue of associated problem investigate dependence this on location...

This paper evaluates the suitability of a newly developed hybrid “Langmuir-Maxwell” and “LangmuirSmoluchowski” slip/jump boundary conditions in the Navier-Stokes-Fourier equations for nano/micro backward-facing step geometry flow which experiences separation and reattachment. Additionally, this paper investigates the effect of different parameters such as step pressure ratio, inflow temperature...

This study investigated seismic analysis of the behavior reinforced concrete beams with various shear spans, stirrup shapes, and tightening zone lengths using Seismo-struct 2020 program. The load–displacement relations 24 different conditions were modeled analytically. analytical model used in was validated by comparing it experimental data from literature. It found that increasing length zone,...

An equation analogous to the Van Deemter equation in chromatography is developed to account for peak broadening in capillary zone electrophoresis (CZE). This equation applies to conditions where the peaks are symmetrical (sample zone concentration much less than background electrolyte concentration). To identify and to quantitate the effects of different contributors to the peak width in CZE, i...

Reservoirs exhibit gradients in conditions and resources along the transition from lotic to lentic habitat that may be important to bluegill ecology. The lotic-lentic gradient can be partitioned into three functional zones: the riverine, transitional, and lacustrine zones. We measured catch frequency and length of bluegills (Lepomis macrochirus) captured along the periphery of these areas (i.e....

An experimental investigation with dry granular flows passing over an obstacle down a rough inclined channel has been performed. The aim is to improve our understanding of the interaction between dense snow avalanches and defence structures. Specific attention was directed to the study of the zone of influence upstream from the obstacle, linked to the formation of a dead zone. The dead zone len...

Laboratory experiments and numerical simulations were utilized in this study to assess the impact of aquifer stratification on saltwater intrusion. Three homogeneous six layered aquifers investigated. Image processing algorithms facilitated precise calculation wedge toe length, width mixing zone, angle It was concluded that length intrusion stratified is predominantly a function permeability co...

The idea that biotic interactions foster diversification is supported by substantial circumstantial evidence, but is challenging to test. We use a uniquely suitable system to ask whether putative coevolution in a plant-pollinator interaction is contributing to speciation. Two subspecies of Joshua tree (Yucca brevifolia brevifolia and Y. b. jaegeriana) have reciprocally obligate relationships wi...

Containing most of the L-selectin and P-selectin glycoprotein ligand-1 (PSGL-1) on their tips, microvilli are believed to promote the initial arrest of neutrophils on endothelium. At the rolling stage following arrest, the lifetimes of the involved molecular bonds depend on the pulling force imposed by the shear stress of blood flow. With two different methods, electron microscopy and micropipe...