From coffee grounds to quantum dots

Coffee: grounds for concern?

C aff eine is the most widely ingested nonregulated substance on earth. A major portion of this drug is consumed as coff ee, with an annual production of over 7.8 million metric tons. Over 2.5 billion cups of coff ee are consumed worldwide each day. Given its popularity, it is hard to conceive of how Western civilization might begin each workday without this critical liquid allotment. Despite t...

New Grounds for Drinking Coffee

"Coffee grounds" through the chest tube.

A 78-yr-old Saudi male was admitted having had epigastric pain and vomiting for 3 days. The patient was unable to give a clear medical history; however, he described the pain to be severe, colicky, nonradiating and aggravated by food. On the day of admission, he had noticed a small amount of fresh blood in the vomitus. The family indicated that he had had a long-standing history of intermittent...

Conductance in quantum wires by three quantum dots arrays

A noninteracting quantum-dot arrays side coupled to a quantum wire is studied. Transport through the quantum wire is investigated by using a noninteracting Anderson tunneling Hamiltonian. The conductance at zero temperature develops an oscillating band with resonances and antiresonances due to constructive and destructive interference in the ballistic channel, respectively. Moreover, we have fo...

Conductance in quantum wires by three quantum dots arrays

A noninteracting quantum-dot arrays side coupled to a quantum wire is studied. Transport through the quantum wire is investigated by using a noninteracting Anderson tunneling Hamiltonian. The conductance at zero temperature develops an oscillating band with resonances and antiresonances due to constructive and destructive interference in the ballistic channel, respectively. Moreover, we have fo...