loading Please wait. Data is being processed...

News of Inventions: 54938
Files of Inventions: 220
Groups of Inventors: 50

Friend Requests:
Private Messages:

Today's News: 0
Yesterday's News: 43

Today: 20 January 2018, Saturday.

All latest news of Inventions in one place

Listed news of Inventions: 13 from total 54938

Filters


Welcome, Guest

News for Theoretical sciences





#1

 

View it
Name
Description An idea for an experiment that could unite the stubborn fields of quantum mechanics and general relativity has been given new life by two groups of physicists from the UK.

#Theoretical sciences
Field # Theoretical sciences
Updated 19 January 2018

#2

 

View it
Name
Description The unique properties of organic semiconductors, such as flexibility and lightness, are increasingly important for information displays, lighting and energy generation. But organics suffer from both static and dynamic disorder, and this can lead to variable-range carrier hopping1,2, which results in notoriously poor electrical properties, with low electron and hole mobilities and correspondingly short charge-diffusion lengths of less than a micrometre3,4. Here we demonstrate a photoactive (light-responsive) organic heterostructure comprising a thin fullerene channel sandwiched between an electron-blocking layer and a blended donor:C70 fullerene heterojunction that generates charges by dissociating excitons. Centimetre-scale diffusion of electrons is observed in the fullerene channel, and this can be fitted with a simple electron diffusion model. Our experiments enable the direct measurement of charge diffusivity in organic semiconductors, which is as high as 0.83 ± 0.07 square centimetres per second in a C60 channel at room temperature. The high diffusivity of the fullerene combined with the extraordinarily long charge-recombination time yields diffusion lengths of more than 3.5 centimetres, orders of magnitude larger than expected for an organic system.

#Theoretical sciences
Field # Theoretical sciences
Updated 18 January 2018

#3

 

View it
Name
Description Gamma ray bursts, intense explosions of light, are the brightest events ever observed in the universe – lasting no longer than seconds or minutes.

#Theoretical sciences
Field # Theoretical sciences
Updated 17 January 2018

#4

 

View it
Name
Description Relapsed acute lymphoblastic leukaemia (ALL) is associated with resistance to chemotherapy and poor prognosis1. Gain-of-function mutations in the 5′-nucleotidase, cytosolic II (NT5C2) gene induce resistance to 6-mercaptopurine and are selectively present in relapsed ALL2,3. Yet, the mechanisms involved in NT5C2 mutation-driven clonal evolution during the initiation of leukaemia, disease progression and relapse remain unknown. Here we use a conditional-and-inducible leukaemia model to demonstrate that expression of NT5C2(R367Q), a highly prevalent relapsed-ALL NT5C2 mutation, induces resistance to chemotherapy with 6-mercaptopurine at the cost of impaired leukaemia cell growth and leukaemia-initiating cell activity. The loss-of-fitness phenotype of NT5C2+/R367Q mutant cells is associated with excess export of purines to the extracellular space and depletion of the intracellular purine-nucleotide pool. Consequently, blocking guanosine synthesis by inhibition of inosine-5′-monophosphate dehydrogenase (IMPDH) induced increased cytotoxicity against NT5C2-mutant leukaemia lymphoblasts. These results identify the fitness cost of NT5C2 mutation and resistance to chemotherapy as key evolutionary drivers that shape clonal evolution in relapsed ALL and support a role for IMPDH inhibition in the treatment of ALL.

#Theoretical sciences
Field # Theoretical sciences
Updated 17 January 2018

#5

 

View it
Name
Description Unearthed letters suggest award committee favored promise and youth over star power

#Theoretical sciences
Field # Theoretical sciences
Updated 16 January 2018

#6

 

View it
Name
Description Scientists, universities, funding agencies, and journals should do more to increase reproducibility, a new report says

#Theoretical sciences
Field # Theoretical sciences
Updated 16 January 2018

#7

 

View it
Name
Description Researchers from the Max Planck Institute of Biophysics in Frankfurt, the Ludwig Maximilian University (LMU) in Munich and the Imperial College London have now developed a technique, which allows them to switch ATP synthase on and off using azopolyphenols and light.

#Theoretical sciences
Field # Theoretical sciences
Updated 16 January 2018

#8

 

View it
Name
Description Researchers reflect on an initiative in New Zealand to make science more inclusive.

#Theoretical sciences
Field # Theoretical sciences
Updated 16 January 2018

#9

 

View it
Name
Description The Dimensions database promises a financial perspective on scholarly literature.

#Theoretical sciences
Field # Theoretical sciences
Updated 16 January 2018

#10

 

View it
Name
Description The contributions of researchers in the developing world must be sought and recognized, says Dyna Rochmyaningsih.

#Theoretical sciences
Field # Theoretical sciences
Updated 16 January 2018

#11

 

View it
Name
Description Watch There’s a New Form of Matter in Town: Excitonium!, a Materials video from Seeker.

#Theoretical sciences
Field # Theoretical sciences
Updated 16 January 2018

#12

 

View it
Name
Description The modern theory of charge polarization in solids1,2 is based on a generalization of Berry’s phase3. The possibility of the quantization of this phase4,5 arising from parallel transport in momentum space is essential to our understanding of systems with topological band structures6,7,8,9,10. Although based on the concept of charge polarization, this same theory can also be used to characterize the Bloch bands of neutral bosonic systems such as photonic11 or phononic crystals12,13. The theory of this quantized polarization has recently been extended from the dipole moment to higher multipole moments14. In particular, a two-dimensional quantized quadrupole insulator is predicted to have gapped yet topological one-dimensional edge modes, which stabilize zero-dimensional in-gap corner states14. However, such a state of matter has not previously been observed experimentally. Here we report measurements of a phononic quadrupole topological insulator. We experimentally characterize the bulk, edge and corner physics of a mechanical metamaterial (a material with tailored mechanical properties) and find the predicted gapped edge and in-gap corner states. We corroborate our findings by comparing the mechanical properties of a topologically non-trivial system to samples in other phases that are predicted by the quadrupole theory. These topological corner states are an important stepping stone to the experimental realization of topologically protected wave guides12,15 in higher dimensions, and thereby open up a new path for the design of metamaterials16,17.

#Theoretical sciences
Field # Theoretical sciences
Updated 15 January 2018

#13

 

View it
Name
Description As usual, CES 2018 provided a bonanza of big screens, loaded up with every piece of tech you can create a buzzword for. But figuring out which TVs will matter t...

#Theoretical sciences
Field # Theoretical sciences
Updated 14 January 2018