We present the rational synthesis of colloidal copper(I) sulfide nanocrystals and demonstrate their application as an active light absorbing component in combination with CdS nanorods to make a solution-processed solar cell with 1.6% power conversion efficiency on both conventional glass substrates and flexible plastic substrates with stability over a 4 month testing period.

M. A. BIOT* A non-linear analysisforfinite strain and stress has been developed and applied to symmetrical deformations around cylindrical and spherical cavities in rock. The material non-linearity which is involved may result porn either elastic or plastic properties. A drastic analytical simplification reduces the problem to the solution of a,first order differential equation. Fracture is ana...

At the beginning of our work on diffusion processes in PVC tubing used in milk collection it was observed that plastic tubes which have been used for extended periods lose their originally smooth inner surface (1). In spite of careful maintenance, fine tears arise, forming a network on the inside which is in contact with milk, water, and cleaning solution (Fig. 1).

We consider the variational inequality, which describes the torsion problem for a long elasto-plastic bar. Using duality methods of the variational calculus, we derive a posteriori estimates of functional type that provide computable and guaranteed upper bounds of the energy norm of the difference between the exact solution and any function from the corresponding energy space that satisfies the...

Abstract. A PDE system consisting of the momentum balance, mass balance, and energy balance equations for displacement, capillary pressure, and temperature as a model for unsaturated fluid flow in a porous viscoelastoplastic solid is shown to admit a solution under appropriate assumptions on the constitutive behavior. The problem involves two hysteresis operators accounting for plastic and capi...

INTRODUCTION Relative value units (RVUs) were developed as a quantifier of requisite training, knowledge, and technical expertise for performing various procedures. In select procedures, increasing RVUs have been shown to substitute well for increasing surgical complexity and have been linked to greater risk of complications. The relationship of RVU to outcomes has yet to be examined in the pla...

Background. The goals of this project were to evaluate the current perspective on letters of recommendation and to assess the need for, and acceptance of, a more standardized letter of recommendation (LOR). Methods. An eight-question survey was distributed to plastic surgery program directors. A five-point Likert scale was selected as a means of quantifying the participants' responses to the su...

Many beginning writers, especially medical residents, feel difficulties in writing journal articles. However, illogical and un-scientific papers are not accepted for publication even if their topics are creative and interesting. The authors should do their best to convince reviewers and readers of their opinions using evidence through reasoning, explanation, and data interpretation. The aim of ...

BACKGROUND Various studies have been conducted in many countries to determine the perception/awareness about plastic surgery. The present study assessed the views of college students about plastic surgery. METHODS A questionnaire consisted of nine questions regarding the basic knowledge about plastic surgery was randomly distributed among college students. The students were given 20 minutes t...

I obtained my Bachelor’s degree from Peking University. For my Bachelor’s thesis, I implemented the residual-free bubble method for advection dominated convection-diffusion problem. My primary research area as a Master’s student was on fluid simulation. My advisor and I developed a continuum plastic fluid model for simulating sand flow. Without having to handle millions of collisions, our solut...