Trend of BGACSPKGD. Developing Trend of High Pin Count BGA.

Reliability Study of High-Pin-Count Flip-Chip BGA

A family of 1.0-mm pitch full-array flip-chip BGAs were developed. These packages vary from 27 to 45 mm in package size, 15 to 25 mm in die size, and 672 to 1020 in ball count. With dies and packages so large, solder joint fatigue failure and underfill delamination, induced by thermal expansion mismatch, are a major concern. Finite element analysis was set up for efficient reliability analysis....

Juvenile Discovery: A Developing Trend and a Word of Caution

Current Developing Trend of Sales Tax on E-Business

This article explores the development of sales tax on e-business. It points out that the problem was rooted in the fact that the seller is required to collect and remit the tax to the buyer’s state government. If the seller and the buyer do not reside in the same state, the buyer’s state government has no jurisdiction over the seller, unless there is a “physical presence” of the seller in the b...

Trend of Elevator-Related Accidents in Tehran

Background:   Elevator-related accidents are uncommon, but can cause significant injury. However, little data exist on these types of accidents. To compile and analyze accident data involving elevators in an effort to eliminate or at least significantly reduce such accidents. Methods: In this retrospective study we investigated 1,819 cases of elevator-related accidents during a four-year period...

Trend Spotting

When you look at library job advertisements you often come across the boilerplate requirement: " awareness of latest trends in academic librarianship. " We want to hire knowledgeable librarians who are up-to-date on issues, best practices, and the major challenges of our field. In the course of an interview, candidates will likely display their currency about academic librarian-ship by answerin...