Understanding House Calls in Margin Accounts

A house call is a demand by a brokerage firm for a cash deposit to cover a shortfall in a margin account. Discover how it works and what it means for investors.

Dark Sky’s Successor is Here: Meet Acme Weather, the Next Big Thing in Forecasting

Acme Weather Dark Sky creators are back with a new app that shows forecast uncertainty instead of hiding it. Available now on ...

New ‘Acme Weather’ app from Dark Sky creators wants to fix weather apps’ biggest problem

The team behind Dark Sky is back with a new weather app for iPhone called “Acme Weather.” One of the primary goals of Acme ...
IEEE

A Fault Arc Circuit Breaker Based on Arc Voltage and Short-circuit Current Detection

Abstract: This paper developed an arc fault circuit breaker capable of effectively identifying both series and parallel are faults, as well as limiting the output quantity of arc faults, which is ...
IEEE

AC Fault Current Calculation of MMC-HVDC System Via Time-Varying Capacitor Model

Abstract: MMC-HVDC has become an ideal solution for the grid connection of offshore wind farms. However, MMC and wind farm have low inertia. Once a fault occurs in the offshore AC system, the fault ...