TECHNICIAN
friday september
13 2013
Raleigh, North Carolina
technicianonline.com
STEM students drop, change majors at increasing rates Jess Thomas
tural Sciences had also withdrawn by their second year. In addition, nearly 18 percent of students who Students who are pursuing a de- entered into the College of Physigree in science-related fields are cal and Mathematical Sciences had dropping out or switching their ma- withdrawn by their second year. jor at increasing numbers, accordAccording Jim Martin, a chemising to the University of California try professor at N.C. State, the reaat Los Angeles. son why STEM majors tend to drop According to the study students out or change their major is because majoring in STEM fields are drop- students who enjoyed science in high ping or switching school do not realout of their respecize that at a higher tive majors. education science The data indiis “completely difcated that about 40 ferent.” percent of students Martin also said, enrolled as STEM “[Many students] major sw itched went into science . subjects or failed because it was this Jim Martin, professor of to get a degree. sort of very well chemistry This trend has also defined, methodibegun to occur at cal thing and then N.C. State, where about 40 percent you get into the actual, more proof the student body is enrolled as fessional practice of it and find the STEM majors. complexity, the question, and the According to data that was pub- problem solving nature, it comes as lished by N.C. State University a shock and that’s why it becomes Planning and Analysis, 11 percent difficult.” of freshman students who entered Professor Jeff Braden, the Dean of into the College of Engineering in College of Humanities and Social 2009 had withdrawn by their sec- Sciences, said that class difficulty ond year. alone does not necessarily explain 11 percent of students who entered into the College of Life & AgriculSTEM continued page 2 Correspondent
SEAN PRUSZKOWSKI/TECHNICIAN
The NSA has access to the data sent and received from your smartphone.
NSA cracks smartphone data security programs Marty DeFrancesco Correspondent
The National Security Agency is now able to bypass smartphone security measures and access data from Blackberry, Android and iPhone devices, according to German news outlet Der Spiegel. The Deutsch magazine said that
the NSA, along with U.K. counterpart GCHQ, has established teams designated to crack security codes of major smartphone providers. The team’s goal is to gather intelligence pertaining to potential terrorist activities. Secret documents cited by Der Spiegal indicate that the NSA’s techniques are being used for surveil-
N.C. State engineering ranks 27 internationally
lance of potential terrorist threats and not for mass surveillance of Americans. No mention was made of how the documents were actually acquired. According to Der Spiegal, the data in question includes, “contacts, call lists, SMS traffic, notes and location
NSA continued page 3
“ ... it comes as a shock, and that’s why it becomes difficult ”
Researchers super stack solar panels, increase efficiency Sasha Afanasieva
Chris Hart-Williams
Staff Writer
Correspondent
Researchers at the Center for World-Class Universities of Shanghai Jiao Tong University, published The Academic Ranking of World Universities, which reported N.C. State is No. 27 of the top 200 universities in the world in the field of engineering. In the U.S., The ARWU ranks engineering at N.C. State No. 20 in the nation, but among public universities alone in the University ranks No. 12. The ARWU evaluates more than 1000 institutions. “Institutions were ranked based on several indicators, such as highly cited researchers, papers indexed in science citation index-expanded, the percentage of papers published in the subject journals that are regarded as the top 20 percent of all subject related journals and the expenditures the institution invests in the subject related research,” according to ARWU. According to the College of RANK continued page 2 Engineering, the university
Speaker discusses religion, democracy and citizenship Rachel Coffman Correspondent
The Department of Philosophy and Religious Studies, along with the Academic Study of Religion club, introduced the University of Maryland’s Ian Ward in a public lecture about Thursday afternoon entitled Solidarity in a Secular Age: Religion, Democracy, and the Work of Citizenship. The lecture, as part of the club’s Religious Studies Col-
loquium Series, emphasized the importance of citizens overcoming their differences in religion and beliefs. N.C. State assistant professor Levi McLaughlin, who went to graduate school with Ward, organized the lecture event. “Ward is one of those rare people who bridges the gap between a variety of studies,” McLaughlin said. His [Ward’s] research includes democratic political theory, critical thought and the aca-
SECULAR continued page 3
Researchers at N.C. State have developed a new way for improving overall efficiency of solar panels that will reduce the cost of solar energy production. The new technique improves the connections between layers of stacked solar cells, which allow them to operate at solar concentrations of 70,000 suns worth of energy, as opposed to the previous commercially available concentrations of 500 to 1000 suns. Peter Colter, a research assistant professor from the electrical and computer engineering department at N.C. State, explained how the process worked. “The big improvement is that it removed tunnel junctions as the bottleneck,” Colter said “A tunnel junction is used as the interconnection between multi-junction solar cells.” Tunnel junctions are what connect the layers of solar cells. Solar cells are made of multiple layers for more energy conversion efficiency. Before the recent breakthrough, the tunnel junctions were a big limiting factor to the amount of energy a solar panel could absorb efficiently. While multi-junction solar energy cells existed for several years, they were expensive and mainly used in space for
Solar field on the roof of the Keystone Science Center.
satellites and Mars rovers. “These multi-junction cells are commonly used for space satellites,” Colter said. “All the television satellites have multi-junction cells on them these days. The main cost of a solar panel in space is launching it rather than the cost of the cells. It saves money by making them smaller.” Previous multi-junction cells such as the ones used in space were very limited by the amount of energy they could absorb. Commercially available solar cell modules can only absorb 31.8 percent of solar energy. The highest recorded multi-junction solar cell could absorb 44.4 percent. The new discovery hopes to
significantly improve the efficiency of solar cells beyond that. “The connecting junction was a problem because you can’t use it with a very high solar concentration,” said Salah Bedair, professor of electrical engineering at N.C. State and one of the main researchers on the project. “We solved the issue by doing some tricks.” According to Bedair, it was recently discovered that by inserting a thin film of gallium arsenide into the connecting junctions of stacked cells, almost all the voltage loss can be eliminated without blocking solar energy. “The stacked junction solar cell is more than just one
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cell. It needs to be connected together with other cells,” Bedair said. “The connecting junction is very critical in multi-junction stacked cells. At the current energy absorption efficiency of 44 percent, we have difficulty using stacked solar cells over 800 suns. After that, higher concentration doesn’t work very well. The achievement we made is that we allowed the connection junction to be used for 70K suns.” The recent development hopes to curb the high cost of producing the multi-junction cells. “Rather than having a large area of solar cells that are very
SOLAR continued page 2