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"Han, F"
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Before Boas : the genesis of ethnography and ethnology in the German Enlightenment
\"An extensive study of the emergence of ethnology and ethnography, and how theories in Europe and Russia during the eighteenth century experienced a paradigm shift with the work of Franz Boas starting in 1886\"-- Provided by publisher.
Book
Hypomethylation of a LINE-1 Promoter Activates an Alternate Transcript of the MET Oncogene in Bladders with Cancer
It was recently shown that a large portion of the human transcriptome can originate from within repetitive elements, leading to ectopic expression of protein-coding genes. However the mechanism of transcriptional activation of repetitive elements has not been definitively elucidated. For the first time, we directly demonstrate that hypomethylation of retrotransposons can cause altered gene expression in humans. We also reveal that active LINE-1s switch from a tetranucleosome to dinucleosome structure, acquiring H2A.Z- and nucleosome-free regions upstream of TSSs, previously shown only at active single-copy genes. Hypomethylation of a specific LINE-1 promoter was also found to induce an alternate transcript of the MET oncogene in bladder tumors and across the entire urothelium of tumor-bearing bladders. These data show that, in addition to contributing to chromosomal instability, hypomethylation of LINE-1s can alter the functional transcriptome and plays a role not only in human disease but also in disease predisposition.
Journal Article
Ice breaking by a high-speed water jet impact
Ice breaking has become one of the main problems faced by ships and other equipment operating in an ice-covered water region. New methods are always being pursued and studied to improve ice-breaking capabilities and efficiencies. Based on the strong damage capability, a high-speed water jet impact is proposed to be used to break an ice plate in contact with water. A series of experiments of water jet impacting ice were performed in a transparent water tank, where the water jets at tens of metres per second were generated by a home-made device and circular ice plates of various thicknesses and scales were produced in a cold room. The entire evolution of the water jet and ice was recorded by two high-speed cameras from the top and front views simultaneously. The focus was the responses of the ice plate, such as crack development and breakup, under the high-speed water jet loads, which involved compressible pressure ${P_1}$ and incompressible pressure ${P_2}$. According to the main cause and crack development sequence, it was found that the damage of the ice could be roughly divided into five patterns. On this basis, the effects of water jet strength, ice thickness, ice plate size and boundary conditions were also investigated. Experiments validated the ice-breaking capability of the high-speed water jet, which could be a new auxiliary ice-breaking method in the future.
Journal Article
The contribution of nitrogen deposition to the eutrophication signal in understorey plant communities of European forests
We evaluated effects of atmospheric deposition of nitrogen on the composition of forest understorey vegetation both in space and time, using repeated data from the European wide monitoring program ICP‐Forests, which focuses on normally managed forest. Our aim was to assess whether both spatial and temporal effects of deposition can be detected by a multiple regression approach using data from managed forests over a relatively short time interval, in which changes in the tree layer are limited. To characterize the vegetation, we used indicators derived from cover percentages per species using multivariate statistics and indicators derived from the presence/absence, that is, species numbers and Ellenberg's indicator values. As explanatory variables, we used climate, altitude, tree species, stand age, and soil chemistry, besides deposition of nitrate, ammonia and sulfate. We analyzed the effects of abiotic conditions at a single point in time by canonical correspondence analysis and multiple regression. The relation between the change in vegetation and abiotic conditions was analyzed using redundancy analysis and multiple regression, for a subset of the plots that had both abiotic data and enough species to compute a mean Ellenberg N value per plot using a minimum of three species. Results showed that the spatial variation in the vegetation is mainly due to “traditional” factors such as soil type and climate, but a statistically significant part of the variation could be ascribed to atmospheric deposition of nitrate. The change in the vegetation over the past c. 10 years was also significantly correlated to nitrate deposition. Although the effect of deposition on the individual species could not be clearly defined, the effect on the vegetation as a whole was a shift toward nitrophytic species as witnessed by an increase in mean Ellenberg's indicator value. Repeated data on understorey vegetation from the European wide monitoring program ICP‐Forests show that there is a small but statistically significant effect of nitrogen deposition on the composition of forest vegetation. Locations with a high nitrogen deposition have a more “nitrophytic” vegetation than locations with a low nitrogen deposition. Moreover, the succession toward a more nitrophytic vegetation is more rapid at locations with a high deposition.
Journal Article
Before Boas
The history of anthropology has been written from multiple viewpoints, often from perspectives of gender, nationality, theory, or politics.Before Boasdelves deeper into issues concerning anthropology's academic origins to present a groundbreaking study that reveals how ethnology and ethnography originated during the eighteenth rather than the nineteenth century, developing parallel to anthropology, or the \"natural history of man.\"
Han F. Vermeulen explores primary and secondary sources from Russia, Germany, Austria, the United States, the Netherlands, Hungary, the Czech Republic, Slovakia, France, and Great Britain in tracing how \"ethnography\" was begun as field research by German-speaking historians and naturalists in Siberia (Russia) during the 1730s and 1740s, was generalized as \"ethnology\" by scholars in Göttingen (Germany) and Vienna (Austria) during the 1770s and 1780s, and was subsequently adopted by researchers in other countries.
Before Boasargues that anthropology and ethnology were separate sciences during the Age of Reason, studying racial and ethnic diversity, respectively. Ethnography and ethnology focused not on \"other\" cultures but on all peoples of all eras. Following G. W. Leibniz, researchers in these fields categorized peoples primarily according to their languages. Franz Boas professionalized the holistic study of anthropology from the 1880s into the twentieth century.
eBook
Magnetoelectric coupling in the paramagnetic state of a metal-organic framework
Although the magnetoelectric effects - the mutual control of electric polarization by magnetic fields and magnetism by electric fields, have been intensively studied in a large number of inorganic compounds and heterostructures, they have been rarely observed in organic materials. Here we demonstrate magnetoelectric coupling in a metal-organic framework [(CH
3
)
2
NH
2
]Mn(HCOO)
3
which exhibits an order-disorder type of ferroelectricity below 185 K. The magnetic susceptibility starts to deviate from the Curie-Weiss law at the paraelectric-ferroelectric transition temperature, suggesting an enhancement of short-range magnetic correlation in the ferroelectric state. Electron spin resonance study further confirms that the magnetic state indeed changes following the ferroelectric phase transition. Inversely, the ferroelectric polarization can be improved by applying high magnetic fields. We interpret the magnetoelectric coupling in the paramagnetic state in the metal-organic framework as a consequence of the magnetoelastic effect that modifies both the superexchange interaction and the hydrogen bonding.
Journal Article
Tunneling anisotropic magnetoresistance driven by magnetic phase transition
The independent control of two magnetic electrodes and spin-coherent transport in magnetic tunnel junctions are strictly required for tunneling magnetoresistance, while junctions with only one ferromagnetic electrode exhibit tunneling anisotropic magnetoresistance dependent on the anisotropic density of states with no room temperature performance so far. Here, we report an alternative approach to obtaining tunneling anisotropic magnetoresistance in α′-FeRh-based junctions driven by the magnetic phase transition of α′-FeRh and resultantly large variation of the density of states in the vicinity of MgO tunneling barrier, referred to as phase transition tunneling anisotropic magnetoresistance. The junctions with only one α′-FeRh magnetic electrode show a magnetoresistance ratio up to 20% at room temperature. Both the polarity and magnitude of the phase transition tunneling anisotropic magnetoresistance can be modulated by interfacial engineering at the α′-FeRh/MgO interface. Besides the fundamental significance, our finding might add a different dimension to magnetic random access memory and antiferromagnet spintronics.
Tunneling anisotropic magnetoresistance is promising for next generation memory devices but limited by the low efficiency and functioning temperature. Here the authors achieved 20% tunneling anisotropic magnetoresistance at room temperature in magnetic tunnel junctions with one α′-FeRh magnetic electrode.
Journal Article
Spin–orbit torque switching in a T-type magnetic configuration with current orthogonal to easy axes
Different symmetry breaking ways determine various magnetization switching modes driven by spin–orbit torques (SOT). For instance, an applied or effective field parallel to applied current is indispensable to switch magnetization with perpendicular anisotropy by SOT. Besides of this mode, here we experimentally demonstrate a distinct field-free switching mode in a T-type magnetic system with structure of MgO/CoFeB/Ta/CoFeB/MgO where a perpendicular layer with tilted easy axis was coupled to an in-plane layer with a uniaxial easy axis. Current was applied orthogonal to both easy axes and thus also normal to an in-plane effective field experienced by the perpendicular layer. Dynamic calculation shows perpendicular layer could be switched at the same time as the in-plane layer is switched. These field-free switching modes realized in the same T-type magnetic system might expedite the birth of multi-state spin memories or spin logic devices which could be operated by all electric manners.
Spin-orbit torque (SOT) induced magnetization switching facilitates all electric multi-state spin memories and spin logic devices. Here the authors show a new SOT field-free switching mode where the perpendicular layer with tilted easy axis is coupled to an in-plane layer with a uniaxial easy axis.
Journal Article
Graphene-based polymer nanocomposites in food packaging and factors affecting the behaviour of graphene-based materials: a review
In recent years, there is a rapid advancement in the reinforcement of polymers using graphene-based materials (GBMs) such as graphene (thickness = ~ 0.34 nm), graphene oxide (GO, thickness = ~ 1.1 nm), and reduced graphene oxide (rGO). GBMs and their nanocomposites have been widely applied in numerous industries. Due to their remarkable properties, GBMs have also been incorporated in food packaging materials, providing efficient reinforcement in mechanical strength, barriers to light, water vapour, and gases, as well as antimicrobial and antioxidant properties, which are crucial in preventing food spoilage. This review aims to assess and summarize the published data in the use of GBMs in polymeric composites, particularly for food packaging. Then, we highlight the main factors that influence the behaviour and properties of the GBMs during the fabrication of the composites. Lastly, this review provides a brief summary of the current limitations as well as the food safety concerns regarding GBMs in food packaging.
Journal Article
High formability of glass plus fcc-Al phases in rapidly solidified Al-based multicomponent alloy
A multicomponent Al
84
Y
9
Ni
4
Co
1.5
Fe
0.5
Pd
1
alloy was found to keep a mixed glassy + Al phases in the relatively large ribbon thickness range up to about 200 μm for the melt-spun ribbon and in the diameter range up to about 1100 μm for the wedge-shaped cone rod prepared by injection copper mold casting. The glassy phase in the Al-based alloy has a unique crystallization process of glass transition, followed by supercooled liquid region, fcc-Al + glass, and then Al + Al
3
Y + Al
9
(Co, Fe)
2
+ unknown phase. It is also noticed that the primary precipitation phase from supercooled liquid is composed of an Al phase instead of coexistent Al + compound phases, being different from the crystallization mode from supercooled liquid for ordinary Al-based glassy alloys. In addition, it is noticed that the mixed Al and glassy phases are extended in a wide heating temperature range of 588–703 K, which is favorable for the development of high-strength nanostructure Al-based bulk alloys obtained by warm extrusion of mixed Al + amorphous phases. The Vickers hardness is about 415 for the glassy phase and increases significantly to about 580 for the mixed Al and glassy phases. The knowledge of forming Al + glassy phases with high hardness in the wide solidification and annealing conditions through high stability up to complete crystallization for the multicomponent alloy is promising for future development of a high-strength Al-based bulk alloy.
Journal Article