145 research outputs found
PR China's Pursuit of a Blue-Water Navy
The development of the navy and the extension of connected capacities is one of the focuses of the military evolution in the People’s Republic of China (later on: China). The directions of the improvement appear to be clear, though achieving their aims are a question of decades, not years. These Chinese steps, the progress they make, new ship classes they develop, advanced technologies they produce will take the upcoming decades to reach their goals – even if sometimes the Western media exaggerates the potential threat posed by the Chinese army.
The paper shortly presents the geopolitical environment of the country, after that analyses the necessity of a blue-water navy, the development they have already started and tries to project ahead their capacities and the relevance of that future Navy
Turbulence-generated proton-scale structures in the terrestrial magnetosheath
Recent results of numerical magnetohydrodynamic simulations suggest that in
collisionless space plasmas turbulence can spontaneously generate thin current
sheets. These coherent structures can partially explain intermittency and the
non-homogenous distribution of localized plasma heating in turbulence. In this
Letter Cluster multi-point observations are used to investigate the
distribution of magnetic field discontinuities and the associated small-scale
current sheets in the terrestrial magnetosheath downstream of a quasi-parallel
bow shock. It is shown experimentally, for the first time, that the strongest
turbulence generated current sheets occupy the long tails of probability
distribution functions (PDFs) associated with extremal values of magnetic field
partial derivatives. During the analyzed one hour long time interval, about a
hundred strong discontinuities, possibly proton-scale current sheets were
observed.Comment: 10 pages, 5 figures in The Astrophysical Journal Letters, Volume 819,
Number 1, 201
BelsĹ‘ migráciĂł Ă©s szellemvárosok KĂnában
A tanulmány bemutatja a kĂnai belsĹ‘ migráciĂłt, annak okait, jellemzĹ‘it Ă©s következmĂ©nyeit, a 150-200 milliĂłs embertömeg helyzetĂ©nek bizonytalanságát. A munkások migráciĂłja szorosan kapcsolĂłdik a vidĂ©ki Ă©s a városi terĂĽletek között fennállĂł, jelentĹ‘s fizetĂ©sbeli kĂĽlönbsĂ©gekhez. A munkahelyek hiánya a migráciĂłs döntĂ©s fĹ‘ oka vidĂ©ken, a választási lehetĹ‘sĂ©gĂĽk lĂ©nyegĂ©ben az otthoni munkanĂ©lkĂĽlisĂ©gre vagy a városokban betöltött, alulfizetett pozĂciĂłkra szűkĂĽlt. A vidĂ©kiek akár egĂ©sz megyĂ©ket, sĹ‘t tartományokat is hajlandĂłak hátrahagyni a munkáért, sokan közĂĽlĂĽk a közeli városokba, többek pedig a part menti metropoliszokba indulnak. A tanulmányban Ă©rintjĂĽk az Ăşn. szellemvárosokat is, melyek a migráciĂłs nyomás mellett a gazdaság pörgetĂ©se, az Ă©pĂtĹ‘ipar foglalkoztatása miatt jöttek Ă©s jönnek lĂ©tre
Preparation of Pyridine N-oxide Derivatives in Microreactor
N-oxidations of different nitrogen-containing heterocyclic molecules are often applied for synthetic transformations in chemistry. The industrial implementation of classical batch oxidation processes are limited due to safety concerns derived from metal ion catalyzed decompositions. These restrictions and other safety concern issues can be minimized or even avoided by applying glass made microreactor setups for this transformation. The N-oxidation of different pyridine derivative, quinoline and isoquinoline is studied using two popular oxidizing reagents. The further transformation of pyridine derivatives is studied through the Polonovski rearrangement in microreactor
Testing Born's Rule in Quantum Mechanics for Three Mutually Exclusive Events
We present a new experimental approach using a three-path interferometer and
find a tighter empirical upper bound on possible violations of Born's Rule. A
deviation from Born's rule would result in multi-order interference. Among the
potential systematic errors that could lead to an apparent violation we
specifically study the nonlinear response of our detectors and present ways to
calibrate this error in order to obtain an even better bound.Comment: 10 pages, 5 figures, accepted for publication in Found. Phy
China and Ethiopia, Part 4: Mekelle Industrial Park
In 2018 and 2019 we published three articles about transportation projects in Ethiopia, a key manifestation of China’s Africa policy in the country: the first modern light railway (tram) system of sub-Saharan Africa in the capital, Addis Ababa, and the Addis–Djibouti railway connecting the landlocked country to the maritime trade routes of the Gulf of Aden and the Red Sea. In January 2020, we followed this up by investigating another possible catalyst of economic growth: Mekelle Industrial Park in Ethiopia’s Tigray National Regional State
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