Acknowledgments
SPlan by ABACOM is a piece of software that can help you design electrical circuit diagrams and schematics. Unfortunately, there is no version of sPlan for Mac available on the developer's website, therefore, you will have to search and download other applications to create your circuits. Last names beginning with Sp in the United States Last names starting with 'Sp' in the US population during the 2000 census. All data is derived from David L. Word, Charles D. Coleman, Robert Nunziata and Robert Kominski (2008). 'Demographic Aspects of Surnames from Census 2000'. Census Bureau. Surnames in the United States Ranked.
![Splan Splan](https://ksr-ugc.imgix.net/assets/012/019/088/0273799ca4546c76e819a8f69fd3e2ec_original.jpg?crop=faces&w=1552&h=873&fit=crop&v=1463724563&auto=format&q=92&s=bd702ec794dfa3d41758353af18b5eab)
This work was supported by the National Natural Science Foundation of China (No. 21076147), Natural Science Foundation of Tianjin (No. 10JCZDJC23700), China International Science and Technology Project (No. 2012DFG41980), Seed Foundation of Tianjin University (new faculty, No. 60302027), Research Fund for the Doctoral Program of Higher Education of China (No. 20120032120011) and High Performance Computing Centre of Tianjin University, P. R. China. We thank Prof. Li for his help in using his Gaussian 03 software package.