Jeffrey M. Aristoff, Tadd T. Truscott, Alexandra H. Techet, and John W. M. Bush Department of Mechanical and Aerospace Engineering, Princeton University, Princeton, New Jersey 08544, USA Naval Undersea Warfare Center, Newport, Rhode Island 02841, USA Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA Department of Mathematics, Massac...

The water-entry of ballistic projectiles is investigated using high-speed digital imaging to capture the subsurface cavity dynamics. Specially designed 0.22 caliber projectiles are fired into water at shallow angles to the free surface (5◦ to 15◦) at Mach numbers between 0.3 and 1.0. Redesigned projectile tip geometries allowed projectiles to successfully enter the water and travel large distan...

We present the results of a combined experimental and theoretical investigation of the normal impact of hydrophobic spheres on a water surface. Particular attention is given to characterizing the shape of the resulting air cavity in the low Bond number limit, where cavity collapse is driven principally by surface tension rather than gravity. A parameter study reveals the dependence of the cavit...

In order to study the coal pillar stability of gob-side entry in gently inclined seam, a comprehensive method including theoretical analysis, numerical modeling, and field monitoring was applied its fracturing instability mechanism. The results show that uneven horizontal stress internal cause asymmetric deformation failure seam. rotation movement main roof distribution were closely related inc...

The past decade has witnessed rapid progress in the field of asymmetric hydrogenation of aromatic compounds, a transformation, which is regarded as one of the most straightforward means for accessing enantiopure cyclic compounds. Extensive research has significantly expanded the substrate scope of this reaction, and substrates such as quinolines, quinoxalines, indoles, furans, pyrroles, pyridin...

Using a theoretical model that incorporates asymmetric information and differing comparative advantages among lenders, this paper analyzes the impact of lender entry on credit access and aggregate net output. The model shows that lender entry has the potential to create a segmented market that increases credit access for those firms targeted by the new lenders but potentially reduces credit acc...

To study the water entry ballistic trajectory of a torpedo, the wind tunnel experiment has been done based on the similarity principle. Then the drag coefficient of the torpedo is got when it enters the water, which is amended by the introduction of continuous supercavitation factor and local cavity effect factor. The vertical plane motion equations are established to get the torpedo’s trajecto...

As a part of an analysis of the nature of chilling injury to seeds, measurements were made of the initial linear rates of water entry into and solute leakage out of cotyledons of soybean at various temperatures. Arrhenius plots were approximately linear for water entry into both living and dead cotyledons, with the slope (and activation energy) for entry into living cells being insignificantly ...