We present the concept, synthesis, and kinetic characterization of PYRROC as the first functionalized cycloalkyne which cannot form isomers in the reaction with azides. In aqueous buffer, PYRROC displays unprecedented rate accelerations in SPAAC of three to four orders of magnitude, leading to rate constants exceeding 400 M(-1) s(-1).

Reusable silica supported perchloric acid and potassium bisulphate have been prepared and explored as green catalysts for thiocyanation of aromatic compounds under conventional and solvent free microwave assisted conditions. The microwave assisted protocol exhibited remarkable rate accelerations and offered selective thiocyanation of aromatic and hetero aromatic compounds in good yields. Reacti...

Accelerations and braking of vehicles can be measured and analyzed with different systems and software. In our case, we used the system G-Tech Pro Performance Meter RR w and Performance Analysis System Software (PASS). This system enables measurements of longitudinal accelerations, lateral accelerations and braking. PASS software has two options, the first is Drag Runs, which is designed for th...

The demographic structure of countries has significant effects on economic growth. Most developing are passing through a transition. Although African still have higher fertility rates than other countries, show decreasing trend, which leads to window opportunity for potential dividend countries. Within this context, paper investigates the relationship between growth accelerations and in ECOWAS ...

In this paper, we present two main results. First, by only one conjecture (Conjecture 2.9) for recognizing a vertex symmetric graph, which is the hardest task for our problem, we construct an algorithm for finding an isomorphism between two graphs in polynomial time O(n). Second, without that conjecture, we prove the algorithm to be of quasi-polynomial time O(n ). The conjectures in this paper ...

ABSTRACT Gravitational acceleration fields can be deduced from the collisionless Boltzmann equation, once distribution function is known. This constructed via method of normalizing flows data sets positions and velocities stars. Here, we consider application this technique to solar neighbourhood. We construct mock a linear superposition multiple ‘quasi-isothermal’ functions, representing stella...

The current study applies a neurophysiological model based on the Polyvagal Theory (Porges, 1995) to interpret fetal heart rate patterns. Beat-to-beat heart rate data from 7 fetuses monitored during the first and second stages of labor were analyzed. Transitory heart rate accelerations and reduced beat-to-beat variability reliably preceded heart rate decelerations. The data are interpreted with...