Results 161 to 170 of about 867,433 (306)

On the resurgent population and food debate [PDF]

open access: yes
Since Malthus wrote his famous Essay on Population, the world has witnessed great improvements in numerous measures of well-being Ð life expectancy, infant mortality, incidence of famines and plagues, per capita food consumption as well as real per ...
Johnson, D. Gale
core   +1 more source

High‐Rate FA‐Based Co‐Evaporated Perovskites: Understanding Rate Limitations and Practical Considerations to Overcome Their Impact

open access: yesAdvanced Functional Materials, EarlyView.
Vacuum‐based deposition is promising for perovskite solar cells to be successfully commercialized. However, co‐evaporation, the most common vapor phase deposition technique, suffers from very low deposition rates. In this work, we reveal that high deposition rates can lead to carbon flakes depositing into the perovskite absorber layers due to material ...
Thomas Feeney   +13 more
wiley   +1 more source

Multiple Twinning in Nacre and Aragonite

open access: yesAdvanced Functional Materials, EarlyView.
Electron backscatter diffraction map of a cluster of geologic aragonite, exhibiting single, double, and triple twins. The whole cluster is approximately 2 cm wide. Colors indicate crystal orientations, so that pixels where the a‐, b‐, and c‐axis is perpendicular to the image plane are green, red, and blue, respectively.
Connor A. Schmidt   +7 more
wiley   +1 more source

How crystallization additives govern halide perovskite grain growth. [PDF]

open access: yesNat Commun
Maschwitz T   +40 more
europepmc   +1 more source

A rule-based functional-structural model of rice considering source and sink functions [PDF]

open access: yes
As a first step towards a generic genotype-phenotype model of rice, we present here a model of the growth and morphology of rice in combination with ecophysiological processes using the technique of functional-structural plant modelling (FSPM) and the ...
Buck-Sorlin, G.H.   +4 more
core   +1 more source

Grain growth in copper

open access: yesFizika : a journal of experimental and theoretical physics, 1982
Istraživan je rast zrna u bakru, tako da su šipke bakra čistoće 4N, promjera 1 cm, zataljene u ampulama napunjenim vodikom, pri tlaku od 13 kPa i temperaturama 973, 1023 i 1073 K. Dobiveni podaci dobro se slažu s relacijom D2 – D20 = K t exp (-H/kT), gdje je H aktivacijska energija za samodifuziju u granici zrna jednaka 0,87 eV, a K = 1,6 x 10-2 cm2 s ...
Butt, M. Z., Feltham, P.
openaire   +1 more source

Insight into the Internal Structure of Biogenic, Synthetic and Geological Apatite by Electron Microscopy and X‐Ray Scattering

open access: yesAdvanced Functional Materials, EarlyView.
Apatite occurs in many forms in nature, e.g. in teeth and geological minerals. Internally, biological apatite contains nanocrystals that are also found in synthetically prepared calcium phosphate nanoparticles which are used in biomedicine, e.g. for gene and drug delivery and for bone regeneration. Abstract Calcium phosphate is the inorganic component (
Kathrin Kostka   +3 more
wiley   +1 more source

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