Chemical Differentiation of Planets: A Core Issue

By plotting empirical chemical element abundances on Earth relative to the Sun and normalized to silicon versus their first ionization potentials, we confirm the existence of a correlation reported earlier. To explain this, we develop a model based on principles of statistical physics that predicts differentiated relative abundances for any planetary body in a solar system as a function of its orbital distance. This simple model is successfully tested against available chemical composition data from CI chondrites and surface compositional data of Mars, Earth, the Moon, Venus, and Mercury. We show, moreover, that deviations from the proposed law for a given planet correspond to later surface segregation of elements driven both by gravity and chemical reactions. We thus provide a new picture for the distribution of elements in the solar system and inside planets, with important consequences for their chemical composition. Particularly, a 4 wt% initial hydrogen content is predicted for bulk early Earth. This converges with other works suggesting that the interior of the Earth could be enriched with hydrogen.

Лінгвальні та позалінгвальні аспекти функціонування суржику в Україні

Lingual and Extralingual Aspects of Surzhyk Functioning in UkraineSurzhyk is a mixed type of speech that is typical within modern Ukraine, where we can observe the coexistence of two major language codes, namely Ukrainian and Russian. These are represented by both literary variants and numerous subcodes, primarily Ukrainian dialects (including transitional dialects, with features related to Russian and Belarusian dialectal areas) and Russian colloquial speech with elements of slang. Some language scholars rank Surzhyk as a separate language subcode – as a peculiar type of pidgin – and try to study its structure (lexical composition, grammatical structure) and areal distribution of elements accordingly. At present, in addition to “classical” Surzhyk, a new type of mixed speech has also arisen on the Russian phonetic-grammatical basis with the involvement of a large number of Ukrainian lexemes (original or borrowed by the Ukrainian language), mainly terms, taken from different fields. This new type of mixed speech is Russian-Ukrainian Surzhyk.The report analyzes several samples of mixed speech. On the basis of this analysis, criteria for the qualification of a text are proposed either as an example of Surzhyk, or simply as speech with signs of interference. Such criteria include lingual (Ukrainian or Russian phonetic basis, levels of interference, number of foreign language implementations, variations within the text), social (language is higher in status at the moment of the occurrence of the phenomenon; the scope of the functioning of the idiom itself), territorial (depending on the speaker’s place of inhabitance – urban or rural) and personal (native/first language of the speaker, level of education, knowledge of the literary language). It was concluded that the new mixed speech differs from Surzhyk in terms of the number of used units of another language, linguistic levels of manifestation, scope of distribution, conditions of occurrence and personal characteristics of speakers, among which the level of education and possession of standard subcodes are of leading importance. It is a tran­sitional phenomenon in the process of the formation of Ukrainian as a state language. Językowe i pozajęzykowe aspekty funkcjonowania surżyka w UkrainieSurżyk to mieszany typ mowy, typowy dla współczesnej Ukrainy, gdzie obserwujemy współistnienie dwóch języków, ukraińskiego i rosyjskiego. Języki te są reprezentowane zarówno przez ich warianty literackie, jak i liczne subkody, przede wszystkim przez dialekty ukraińskie (w tym również dialekty przejściowe do rosyjskiego i białoruskiego obszaru dialektalnego) oraz przez potoczną odmianę języka rosyjskiego z elementami slangu. Niektórzy językoznawcy uważają surżyk za odrębny subkod językowy – swoisty rodzaj pidginu – i podejmują próby analizy jego struktury (leksykonu, gramatyki) i uwarunkowań z zakresu geografii językowej. Obecnie obok „klasycznego” surżyka pojawił się nowy typ mowy mieszanej, oparty na bazie fonetyczno-gramatycznej języka rosyjskiego, z udziałem dużej liczby leksemów ukraińskich (oryginalnych lub zapożyczonych do języka ukraińskiego), głównie terminów z zakresu wielu dziedzin. Ten nowy rodzaj mowy mieszanej to surżyk rosyjsko-ukraiński.W niniejszym tekście poddano analizie próbki tego typu mowy mieszanej. Na podstawie analizy zaproponowano kryteria dwojakiej kwalifikacji tekstu, bądź jako przykładu surżyka, bądź po prostu jako przykładu mowy z cechami interferencji. Kryteria te mają charakter lingwistyczny (ukraińska lub rosyjska baza artykulacyjna, zakres interferencji, liczba jednostek zaadaptowanych z języków obcych, poziom wariancji tekstowej), socjologiczny (język o wyższym statusie w momencie wystąpienia danego zjawiska; zakres funkcjonowania idiomu), terytorialny (w zależności od miejsca zamieszkania mówiącego – miejski lub wiejski) i indywidualny (ojczysty/pierwszy język mówiącego, poziom wykształcenia, znajomość języka literackiego). Stwierdzono, że nowa mowa mieszana różni się od surżyka pod względem liczby używanych jednostek z innego języka, płaszczyzny językowej jego realizacji, zasięgu i warunków jego występowania, indywidualnych cech mówiących, wśród których poziom wykształcenia i znajomość subkodów standardowych mają pierwszorzędne znaczenie. Mamy tu do czynienia ze zjawiskiem przejściowym w procesie uzyskiwania przez język ukraiński statusu języka państwowego.

Monthly variation of micro- and macro-element composition in smooth scallop, Flexopecten glaber (Linnaeus, 1758), from the Çardak Lagoon (Çanakkale Strait, Turkey)

The present study investigated the total elemental composition (Fe, Cu, Mn, Zn, Al, S, B, Na, Mg, K, Ca, P, S) in smooth scallop (Flexopecten glaber) meat collected monthly in the Çardak Lagoon (Turkey) in 2017- 2018. Considering the distribution of elements in terms of quantity during the year, the elements were sorted as S> Na> K> P> Mg> Ca> Fe> Zn> Mn> Al> B> Cu> Se and the heavy metals were below the detection limit. Although the elements were at their highest values during autumn and summer, they were at their lowest values during spring and winter. The differences between the months in terms of Fe, Mn, Mg, and Ca elements were found to be statistically significant (p <0.05). It was determined that the element composition of smooth scallop meat was suitable for consumption in terms of the area where it is collected and is beneficial for health when consumed in the amounts recommended by FAO/WHO, and CODEX. The Hazard Quotient (THQ) and the Hazard Index (HI), which was conducted to evaluate the health risks of consuming smooth

Distribution of micro- (Fe, Zn, Cu, and Mn) and risk (Al, As, Cr, Ni, Pb, and Cd) elements in the organs of Rumex alpinus L. in the Alps and Krkonoše Mountains ac* Michaela Jungová, a b Michael O. Asare, a Vladimíra Jurasová, a Michal Hejcman

Background and aimsRumex alpinus is a native plant in the mountains of Europe whose distribution has partly been affected by its utilization as a vegetable and medicinal herb. The distribution of micro and risk elements in its organs is not well-known. The study examined the safety of consuming Rumex alpinus from the Krkonoše Mountains, Czech Republic, and the Alps (Austria and Italy).MethodsWe determined the total and plant-available content of Fe, Zn, Cu, Mn, Al, As, Cr, Ni, Pb, and Cd in the soil and total content in organs of Rumex alpinus.ResultsThe uptake and distribution of elements by plants were characterized by bioaccumulation (BF) and translocation (TF) factors. The intensity of elements accumulation by Rumex alpinus is considerably different, depending on locality. Rumex alpinus has considerable tolerance to Zn, Cu, As, Cr, Ni, with an easy accumulation strategy. High Al and Cd content in belowground biomass (rhizome) indicate a defensive mechanism for them. Although the aboveground biomass (emerging, senescent, mature leaves, petiole) has some degree of accumulation of risk elements, the results showed that Rumex alpinus is an excluder.ConclusionRumex alpinus does not accumulate risk elements in organs that are consumed based on the World Health Organization (2001) and can therefore be consumed without concern.

The Use of ZrO2 Waste for the Electrolytic Production of Composite Ni–P–ZrO2 Powder

Ni–P–ZrO2 composite powder was obtained from a galvanic nickel bath with ZrO2 powder. Production was conducted under galvanostatic conditions. The Ni–P–ZrO2 composite powder was characterized by the presence of ZrO2 particles covered with electrolytical nanocrystalline Ni–P coating. The chemical composition (XRF method), phase structure (XRD method) and morphology (SEM) of Ni–P–ZrO2 and the distribution of elements in the powder were all investigated. Based on the analyses, it was found that the obtained powder contained about 50 weight % Zr and 40 weight % Ni. Phase structure analysis showed that the basic crystalline component of the tested powder is a mixed oxide of zirconium and yttrium Zr0.92Y0.08O1.96. In addition, the sample contains very large amounts of amorphous compounds (Ni–P). The mechanism to produce the composite powder particles is explained on the basis of Ni2+ ions adsorption process on the metal oxide particles. Current flow through the cell forces the movement of particles in the bath. Oxide grains with adsorbed nickel ions were transported to the cathode surface. Ni2+ ions were discharged. The oxide particles were covered with a Ni–P layer and the heavy composite grains of Ni–P–ZrO2 flowed down to the bottom of the cell.

Role of bedrock serpentinization on the development of nickel laterite deposit in Sorowako, Sulawesi, Indonesia

The objective of this research is to analyze the role of bedrock serpentinization on the development of Ni-Laterite deposits in Sorowako, Sulawesi Island, Indonesia. Samples were obtained from coring data in three areas, namely the West Block, East Block, and Petea, which are subject to mineralogical and geochemical analyses. Petrography of the bedrocks was conducted to analyze the mineral composition, texture, and serpentinization degree, and later correlated with the distribution of geochemical elements from X-ray fluorescence method in each laterite zone. The bedrock in the West Block is dunite which consists of predominantly olivine with low degree serpentinization. The bedrock in the East Blocks and Petea consists of peridotite in the form of lherzolite and harzburgite which have been moderate to highly serpentinized. The distribution of elements in each block shows that MgO, SiO2, and Ca elements significantly decrease towards the upper laterite profile while Fe, Al, and Cr are enriched in the limonite zone and Ni, Mn, and Co are significantly enriched in the saprolite zone. Ni, Fe, SiO2, Cr, MgO, and Mn in the West Block are relatively higher than the East Block and Petea. This study shows that Ni content is relatively higher in West Block compare to East Block and Petea in averages of 1.7%, 1.53%, and 1.3%, respectively. Olivine-rich bedrock and a low degree of serpentinization resulted in high-Ni concentration in the laterite profile, particularly in the saprolite layer. This means that bedrock characteristics and degree of serpentinization were responsible for the development of nickel.

Optimization of laser cladding parameters of nickel-based metal powder for creation a heat-resistant coating

Optimization of laser deposition of nickel aluminide was carried out to obtain a single track of high quality. The structure of single tracks was investigated. Based on the data obtained, a multilayer structure was deposited and a study of the distribution of elements was carried out.

Influence of Adding Modifying Elements and Homogenization Annealing on Laser Melting Process of the Modified AlZnMgCu with 4%Si Alloys

AlZnMgCu, the high-strength aluminum alloy, is unsuitable for laser melting applications due to its high hot cracking sensitivity and large solidification temperature range. Adapting this alloy for laser melting processing is a high-demand research issue for extending its use. Thus, this paper investigates the effect of adding 4%Si, 4%Si-Sc+Zr, 4%Si-Ti+B, and homogenization annealing on the laser melting process (LMP) of AlZnMgCu alloy. Homogenization annealing at 500 °C for 6.5 h was selected to dissolve most of the low melting temperature phases into the grain matrix and perform stable alloys for the LMP. The pulsed laser melting process (PLM) was performed on the as-casted and the homogenized samples. The microstructures of the as-casted, the homogenized alloys, and after the LMP were evaluated. In addition, the hardness of the base metal (BM) and laser melted zone (LMZ) were measured. The results revealed that the microstructure was enhanced and refined in the as-cast state by adding the modifiers due to the increasing nucleation potency of solidification sites and the formation of primary Al3(Ti, Zr, Sc) phases. The average grain size was decreased by 15.6 times when adding 4%Si + 0.4%Zr + 0.29%Sc, while it decreased by 10.2 times when adding 4%Si + 1%Ti + 0.2%B. The LMZ of the as-casted samples exhibited a non-uniform distribution of the grains and the elements after the LMP. This was attributed to the evaporation of Zn, Mg during the high laser power process besides the non-uniform distribution of elements and phases in samples during casting. After the laser treating of the homogenized samples with 4%Si-Sc + Zr, uniform columnar grains were formed in the direction of the laser. The presence of Ti and B changed the crystallization nature, resulting in the LMZ with very fine and equiaxed grains due to forming many nucleation centers during solidification. The hardness values have positively increased due to Si addition and adding a combination of Ti + B and Sc + Zr. The maximum hardness was 153.9 ± 5 HV achieved in the LMZ of the homogenized samples of 4%Si + 1%Ti + 0.2%B.