Graphic showing van der Waals BSCCO device. (a) Optical image of Hall bar device, (b) Cross-sectional view of a typical device in scanning TEM. Columns of atoms are visible as dark spots; black arrows point to bismuth oxide layers (darkest spots), while gray arrows show their extrapolated positions. (c) Resistivity as a function of temperature for devices of a different thickness.
Ujjwal Das, an associate scientist at the University of Delaware's Institute of Energy Conversion, examines a silicon wafer after a thin layer of sulfur - less than 5 nanometers thick - was deposited on the surface. In the background, doctoral students Robert Theisen and Isaac Lam watch a silicon wafer emerge from the atmospheric pressure vapor treatment reactor, where it was treated with hydrogen sulfide and hydrogen selenide gases. The reactor was developed at IEC.
Samarium sulfide doped with various rare earth elements shrinks as the temperature increases from about minus 175°C to about 40-60°C. Shown here is the relative linear shrinkage compared to the length at about 120°C. For the Cerium (Ce) dopant, the percentage volume decrease is about 2.6%. These samples were produced by an industrially scalable process, paving the way for practical applications of this class of sulfides as thermal-expansion compensators.
Biochips are driving next-generation DNA sequencing technologies, and this powerful combination is capable of solving unique and important biological problems, such as single-cell, rare-cell or rare-molecule analysis, which next-generation sequencing can't do on its own. In APL Bioengineering, researchers from Seoul National University explore the role advancements in biochip technology are playing in driving groundbreaking scientific discoveries and breakthroughs in medicine via next-generation sequencing, aka high-throughput sequencing. This image shows perspectives on potential biochips used for next generation sequencing for promising applications in biotechnology.
(a) Product of microwave photoconductivity intensity and its lifetime of oxyhalide photocatalyt 2 vs calcination temperature. The microwave measurements suggest the optimal temperature of 600 ? that is 100 ? lower than the reported one. (b) O2-evolution rate of oxyhalide photocatalyt 2 prepared by different calcination temperature.
The development of power and propulsion technologies for future unmanned aircraft systems will deliver more reach, lethality and protection for the Army's modernization efforts -- all issues that are center stage for a group of researchers from the Army's corporate research laboratory and its partners across academia and industry at a recent University of Illinois at Chicago event. The MQ-1C Gray Eagle Unmanned Aircraft System addresses the need for a long-endurance, armed, unmanned aircraft system that offers greater range, altitude and payload flexibility over earlier systems.
Using a box built from stacked atomically thin layers of the material tungsten disulphide (see the atomic model), Chalmers researchers have succeeded in creating a type of feedback loop in which light and matter become one. This new concept involves two distinct processes being housed in the same nanodisk. The box has a diameter of only 100 nanometres (0.00001 centimetres) and opens the way to new fundamental research and more compact solutions in nanophotonics.