bluuebunny/crossref_metadata_2025 huggingface dataset:
An allelic variant in the intergenic region between ERAP1 and ERAP2 correlates with an inverse expression of the two genes
Authors: Paladini Fabiana , Fiorillo Maria Teresa , Vitulano Carolina , Tedeschi Valentina , Piga Matteo , Cauli Alberto , Mathieu Alessandro , Sorrentino Rosa
Published: July 2018

The Endoplasmatic Reticulum Aminopeptidases ERAP1 and ERAP2 are implicated in a variety of immune and non-immune functions. Most studies however have focused on their role in shaping the HLA class I peptidome by trimming peptides to the optimal size. Genome Wide Association Studies highlighted non-synonymous polymorphisms in their coding regions as associated with several immune mediated diseases. The two genes lie contiguous and oppositely oriented on the 5q15 chromosomal region. Very little is known about the transcriptional regulation and the quantitative variations of these enzymes. Here, we correlated the level of transcripts and proteins of the two aminopeptidases in B-lymphoblastoid cell lines from 44 donors harbouring allelic variants in the intergenic region between ERAP1 and ERAP2. We found that the presence of a G instead of an A at SNP rs75862629 in the ERAP2 gene promoter strongly influences the expression of the two ERAPs with a down-modulation of ERAP2 coupled with a significant higher expression of ERAP1. We therefore show here for the first time a coordinated quantitative regulation of the two ERAP genes, which can be relevant for the setting of specific therapeutic approaches.
Advances in Catalytic Processes of Microalgae Conversion into Biofuels and Chemicals
Authors: Lin Ronghong , Wang Congjun , Wang Ping , Duan Yuhua , Link Dirk , Morreale Bryan , Shi Fan
Published: July 2018

Due to the limited reserves of non-renewable fossil fuel resources, continued high demands for fuels, and increased concerns about climate change, the transportation industry faces relentless challenges both from a global market and environmental perspective. As a result, the production of transportation fuels from/via microalgae continues to attract much attention because of its potential for fast growth rates, high oil content, ability to grow in unconventional scenarios, and inherent carbon neutrality. Moreover, the microalgae path minimizes the “food versus fuel” concerns associated with several other biomass based strategies, as microalgae do not compete with food crops in the food supply chain. This chapter reviews the recent progress on biofuels/chemicals production via catalytic conversion of microalgae feedstock, as well as the catalytic process of microalgae as an intermediate. The catalytic conversion reaction pathways are fully discussed based on both experimental and theoretical approaches. The usage of microalgae as biocatalysts over bio-electrochemical fuel cells is also described. Finally, this work makes several projections for the potential of various pathways in producing alternative biofuels and chemicals using microalgae.
Electrochemical determination of Cd(ii) and Pb(ii) in mining effluents using a bismuth-coated carbon fiber microelectrode
Authors: Peña Roselyn C. , Cornejo Lorena , Bertotti Mauro , Brett Christopher M. A.
Published: July 2018

A new bismuth-coated carbon fiber microelectrode (BiFME) has been developed and used for the determination of Cd(ii) and Pb(ii) by square wave anodic stripping voltammetry (SWASV).
In vivotailor-made protein corona of a prodrug-based nanoassembly fabricated by redox dual-sensitive paclitaxel prodrug for the superselective treatment of breast cancer
Authors: Zhang Dong , Yang Jincheng , Guan Jibin , Yang Bin , Zhang Shenwu , Sun Mengchi , Yang Ruitao , Zhang Tao , Zhang Ruoshi , Kan Qiming , Zhang Haotian , He Zhonggui , Shang Lei , Sun Jin
Published: July 2018

A PTX-maleimide prodrug nanosystem with enhanced endogenous albumin binding and potent antitumor effect is presented.
NaI-mediated divergent synthesis of isatins and isoindigoes: a new protocol enabled by an oxidation relay strategy
Authors: Zhang Hong-hua , Wang Yong-qiang , Huang Long-tao , Zhu Long-qing , Feng Yi-yue , Lu Ying-mei , Zhao Quan-yi , Wang Xue-qiang , Wang Zhen
Published: July 2018

A new approach for the synthesis of isatins and isoindigoes by an inexpensive and environmentally friendly NaI-mediated transformation is disclosed.
Theoretical evidence of low-threshold amplified spontaneous emission in organic emitters: transition density and intramolecular vibrational mode analysis
Authors: Ma Lin , Yu Yue , Jiao Bo , Hou Xun , Wu Zhaoxin
Published: July 2018

Organic gain materials are highly attractive for lasing due to their chemical tunability and large stimulated emission cross sections.
High-yield graphene produced from the synergistic effect of inflated temperature and gelatin offers high stability and cellular compatibility
Authors: Tiwari Pranav , Kaur Navpreet , Sharma Vinay , Mobin Shaikh M.
Published: July 2018

Direct exfoliation of graphite to graphene using gelatin by varying the exfoliation parameters offers high stability and good cyto- and hemocompatibility.
Phase miscibility and dynamic heterogeneity in PMMA/SAN blends through solvent free reactive grafting of SAN on graphene oxide
Authors: Muzata Tanyaradzwa S. , P. L. Jagadeshvaran , Kar Goutam Prasanna , Bose Suryasarathi
Published: July 2018

The spatial distribution of nanoparticles in a particular host polymer matrix can be improved by using brush coated nanoparticles.
Synergistic effect of Ti3+ doping and facet regulation over Ti3+-doped TiO2 nanosheets with enhanced photoreactivity
Authors: Liu Xiaogang , Bi Yingpu
Published: July 2018

Ti3+-doped TiO2 nanosheets with different percentages of exposed {001} facets were synthesized by aluminium (Al) reduction.
Comparative toxicity assessment of novel Si quantum dots and their traditional Cd-based counterparts using bacteria models Shewanella oneidensis and Bacillus subtilis
Authors: Pramanik Sunipa , Hill Samantha K. E. , Zhi Bo , Hudson-Smith Natalie V. , Wu Jeslin J. , White Jacob N. , McIntire Eileen A. , Kondeti V. S. Santosh K. , Lee Amani L. , Bruggeman Peter J. , Kortshagen Uwe R. , Haynes Christy L.
Published: July 2018

The investigated Si quantum dots do not affect the viability of bacterial cells, and could potentially prove to be a more environment-friendly, sustainable, and cheaper alternative to traditional Cd-based quantum dots.
Discovery of new FXR agonists based on 6-ECDCA binding properties by virtual screening and molecular docking
Authors: Giancristofaro Antonella , Barbosa Arménio J. M. , Ammazzalorso Alessandra , Amoia Pasquale , De Filippis Barbara , Fantacuzzi Marialuigia , Giampietro Letizia , Maccallini Cristina , Amoroso Rosa
Published: July 2018

Three novel FXR agonists are reported, one full agonist, more efficient than the endogenous ligand chenodeoxycholic acid, and two partial agonists.
Comparative metabolomic analysis reveals global cadmium stress response ofLactobacillus plantarumstrains
Authors: Zhai Qixiao , Xiao Yue , Narbad Arjan , Chen Wei
Published: July 2018

The underlying mechanism of strain-specific differences ofL. plantarumin terms of cadmium (Cd) tolerance was elucidated, and some key metabolite biomarkers were annotated.
Nickel(ii)-promoted specific hydrolysis of zinc finger proteins
Authors: Belczyk-Ciesielska Agnieszka , Csipak Brigitta , Hajdu Bálint , Sparavier Aleksandra , Asaka Masamitsu N. , Nagata Kyosuke , Gyurcsik Béla , Bal Wojciech
Published: July 2018

The (S/T)XH sequence in Cys2His2zinc fingers can be hydrolytically cleaved by Ni(ii) ions. This reaction can be applied for purification, inhibition or activation of designed zinc finger fusion proteins.
Construction of a solar spectrum active SnS/ZnO p–n heterojunction as a highly efficient photocatalyst: the effect of the sensitization process on its performance
Authors: Jayswal Shefali , Moirangthem Rakesh S.
Published: July 2018

Comparison of photocatalytic activity of ex situ and in situ sensitized 1D SnS/ZnO in the photodegradation of multiple organic dyes under sunlight.
Effects of sol–gel process parameters on the anticorrosive performance of phosphosilicate hybrid coatings for carbon steel: structural and electrochemical studies
Authors: Phan Thi Trang , Bentiss Fouad , Jama Charafeddine
Published: July 2018

The effects of several sol–gel process parameters such as acid catalyst addition and the heat treatment procedure on porosity and anticorrosive properties were investigated for phosphosilicate sol–gel hybrid coatings prepared from 3-[(methacryloyloxy)propyl] trimethoxysilane (MEMO) and bis-[2-(methacryloyloxy)ethyl] phosphate (BMEP).
Porous cobalt sulfide hollow nanospheres with tunable optical property for magnetic resonance imaging-guided photothermal therapy
Authors: Guan Guoqiang , Wang Xin , Huang Xiaojuan , Zhang Wenlong , Cui Zhe , Zhang Yongfang , Lu Xinwu , Zou Rujia , Hu Junqing
Published: July 2018

Simple, highly efficient, and safe porous cobalt sulfide hollow nanospheres with tunable absorption as a magnetic resonance imaging-guided photothermal theranostic platform.
Patterned liquid metal contacts for high density, stick-and-peel 2D material device arrays
Authors: Chen Yen-Lin , Nguyen Yen , Wu Shuo-En , Chun Yi-Chin , Chuang Chiashain , Hsieh Ya-Ping , Hofmann Mario
Published: July 2018

Complex liquid metal contacts were fabricated using a new filling process that enable microscopic and reusable 2D materials devices.
Effect of mixed surface terminations on the structural and electrochemical properties of two-dimensional Ti3C2T2 and V2CT2 MXenes multilayers
Authors: Caffrey Nuala M.
Published: July 2018

The inclusion of mixed, rather than uniform, termination groups on the surface of layered MXene materials is required to model their structural, electronic and electrochemical properties.
Structurally characterized dipalladium(ii)-oxamate metallacyclophanes as efficient catalysts for sustainable Heck and Suzuki reactions in ionic liquids
Authors: Fortea-Pérez Francisco Ramón , El Idrissi Moubtassim Mouly Lahcen , Armentano Donatella , De Munno Giovanni , Julve Miguel , Stiriba Salah-Eddine
Published: July 2018

Dipalladium-oxamate metallacyclophanes were synthesised, structurally characterized and applied in carbon–carbon cross couplings in ionic liquids.
Palladium-catalyzed carbonylation of thioacetates and aryl iodides for the synthesis of S-aryl thioesters
Authors: Kim Myungjin , Yu Subeen , Kim Jeung Gon , Lee Sunwoo
Published: July 2018

Palladium-catalyzed carbonylation of thioacetates and aryl iodides provided thioesters in good yields.
Intramolecular oxysulfonylation of alkenes with the insertion of sulfur dioxide under photocatalysis
Authors: He Fu-Sheng , Cen Xufeng , Yang Shuying , Zhang Jun , Xia Hongguang , Wu Jie
Published: July 2018

Intramolecular oxysulfonylation of alkenes with the insertion of sulfur dioxide promoted by visible light is developed, leading to sulfonated tetrahydrofurans and related compounds in moderate to good yields.
A facile synthesis of diverse 5-arylated triazoles via a Cu-catalyzed oxidative interrupted click reaction with arylboronic acids in air
Authors: Yu Xiaoxia , Xu Jian , Zhou Yao , Song Qiuling
Published: July 2018

A Cu-catalyzed synthesis of 5-arylsubstituted 1,2,3-triazoles via an oxidative interrupted click reaction with arylboronic acids in air at room temperature is disclosed.
Oxidized multiwall carbon nanotube/silicone foam composites with effective electromagnetic interference shielding and high gamma radiation stability
Authors: Huang Furong , Wang Yimeng , Wang Peiyu , Ma Hui-ling , Chen Xibang , Cao Ke , Pei Yongmao , Peng Jing , Li Jiuqiang , Zhai Maolin
Published: July 2018

The o-MWCNT/silicone foam composites exhibited effective EMI shielding, excellent mechanical strength and high gamma radiation stability.
Hydrodynamic electrospray ionization jetting of calcium alginate particles: effect of spray-mode, spraying distance and concentration
Authors: Rutkowski Sven , Si Tieyan , Gai Meiyu , Frueh Johannes , He Qiang
Published: July 2018

Hydrodynamic electrospray ionization jetting was applied for generating and characterizing calcium cross-linked alginate microparticles.
Highly efficient and recyclable water-soluble fullerene-supported PdCl2 nanocatalyst in Suzuki–Miyaura cross-coupling reaction
Authors: Li Jingbo , Huo Ping , Zheng Junwei , Zhou Xiuming , Liu Wanyun
Published: July 2018

The water-soluble fullerene-supported PdCl2 nanocatalyst [C60-TEGS/PdCl2] exhibits high activity and recycling in pure water toward the Suzuki–Miyaura cross-coupling reaction.
Low cost bio-derived carbon-sprinkled manganese dioxide as an efficient sulfur host for lithium–sulfur batteries
Authors: Raghunandanan Aswathy , Mani Ulaganathan , Pitchai Ragupathy
Published: July 2018

MnO2-biomass (hemp) derived carbon composite is used as an effective cathode in Li–S cell. MnO2acted as polysulfide scuffolding in the composite enhancing Li–S cell performance. New carbon source (hemp-fibre) was utilised successfully in Li–S.
Structuring learning processes by ladders of learning: results from an implementation study
Authors: van Vorst Helena
Published: July 2018

This paper introduces Ladders of Learning (LLs) as a tool for structuring learning content and the teaching process in a transparent way for students. Learning material for a LL for Bohr's atomic model was developed by cooperation between chemistry teachers and university researchers and implemented in grade-eight chemistry classes. For evaluating the effectiveness of LLs, a mixed method research study was conducted. In a quantitative pre–post study, students’ cognitive and affective outcomes were investigated by questionnaires and compared to the results of a control group. In addition, semi-structured interviews were conducted to analyse students’ views on the LL. The results of the quantitative data analysis showed positive effects of the LL on students’ learning achievement and their interest in chemistry. The results from the qualitative data analysis confirmed these positive findings. However, students’ feedback indicated differences between the views of high-performing students and students with a lower performance in chemistry. Overall, the results of the study emphasize the relevance of structuring as a variable of teaching quality.
Origin of the stability of two-dimensional perovskites: a first-principles study
Authors: Yang Yi , Gao Fei , Gao Shiwu , Wei Su-Huai
Published: July 2018

The calculated formation energies indicate that CsBr(MAI)-terminated 2D perovskites are more stable than PbBr2(PbI2)-terminated 2D structures and an MAI-terminated monolayer could be even more stable than an MAPbI3 bulk.
Rational design criteria for D–π–A structured organic and porphyrin sensitizers for highly efficient dye-sensitized solar cells
Authors: Ji Jung-Min , Zhou Haoran , Kim Hwan Kyu
Published: July 2018

This review discusses recent progress and the rational design criteria used in the structural design of organic dyes and porphyrin photosensitizers for DSSCs. The effects of molecular structural engineering on the photophysical and electrochemical properties, photovoltaic parameters, and efficiency of DSSCs are presented.
Integration of hydrogels with functional nanoparticles using hydrophobic comb-like polymers as an adhesive layer
Authors: Chen Lie , Gu Zhandong , Li La , Lei Wenwei , Rong Qinfeng , Zhao Chuangqi , Wu Qingshan , Gu Zhen , Jin Xu , Jiang Lei , Liu Mingjie
Published: July 2018

Hydrophobic polymeric layer on hydrogel surfaces as an adhesive layer and contribute to the integration of hydrogel with functional nanoparticles.
A minimal non-radiative recombination loss for efficient non-fullerene all-small-molecule organic solar cells with a low energy loss of 0.54 eV and high open-circuit voltage of 1.15 V
Authors: Yang Daobin , Wang Yuming , Sano Takeshi , Gao Feng , Sasabe Hisahiro , Kido Junji
Published: July 2018

A minimal non-radiative recombination energy loss of 0.21 eV is achieved for non-fullerene all-small-molecule organic solar cells.
Engineering the nanostructure of molybdenum nitride nanodot embedded N-doped porous hollow carbon nanochains for rapid all pH hydrogen evolution
Authors: Wang Min-Qiang , Tang Chun , Ye Cui , Duan Jingjing , Li Changming , Chen Yuming , Bao Shu-Juan , Xu Maowen
Published: July 2018

Necklace-like nanochains composed of molybdenum nitride embedded N-doped carbon for efficient all pH hydrogen evolution.
Nitrogen-doped bamboo-like carbon nanotubes as anode material for high performance potassium ion batteries
Authors: Liu Yanzhen , Yang Chenghao , Pan Qichang , Li Youpeng , Wang Gang , Ou Xing , Zheng Fenghua , Xiong Xunhui , Liu Meilin , Zhang Qinyuan
Published: July 2018

Nitrogen-doped bamboo-like carbon nanotubes enable a simple intercalation of K+ ions and provide enough spaces to accommodate volume change.
A new polymer donor for efficient polymer solar cells: simultaneously realizing high short-circuit current density and transparency
Authors: Yang Hang , Wu Yue , Zou Yan , Dong Yingying , Yuan Jianyu , Cui Chaohua , Li Yongfang
Published: July 2018

A new polymer donor is developed for efficient polymer solar cells which can simultaneously achieve high short-circuit current density and transparency.
A review on visible-light induced photoelectrochemical sensors based on CdS nanoparticles
Authors: Ibrahim Izwaharyanie , Lim Hong Ngee , Mohd Zawawi Ruzniza , Ahmad Tajudin Asilah , Ng Yun Hau , Guo Hang , Huang Nay Ming
Published: July 2018

Discovering the distinctive photophysical properties of semiconductor nanoparticles (NPs) has made these a popular subject in recent advances in nanotechnology-related analytical methods.
Laser-induced orientation transformation of a conjugated polymer thin film with enhanced vertical charge transport
Authors: Chae Sangmin , Yi Ahra , Lee Hyun Hwi , Choi Jiyeon , Kim Hyo Jung
Published: July 2018

An efficient method which enables one to transform the orientation and enhance the electrical properties of a conjugated polymer thin film is proposed via laser direct writing.
Triphenylamine disubstituted naphthalene diimide: elucidation of excited states involved in TADF and application in near-infrared organic light emitting diodes
Authors: Higginbotham Heather F. , Pander Piotr , Rybakiewicz Renata , Etherington Marc K. , Maniam Subashani , Zagorska Malgorzata , Pron Adam , Monkman Andrew P. , Data Przemyslaw
Published: July 2018

A new TADF emitter is presented showing near-infrared efficient emission.
Ameliorative effects of selenium on the excess apoptosis of the jejunum caused by AFB1through death receptor and endoplasmic reticulum pathways
Authors: Fang Jing , Zheng Zhixiang , Yang Zhuangzhi , Peng Xi , Zuo Zhicai , Cui Hengmin , Ouyang Ping , Shu Gang , Chen Zhengli , Huang Chao
Published: July 2018

Aflatoxin B1(AFB1), one of most potent and common mycotoxins in human food and animal feed, has hepatotoxic and carcinogenic effects on humans and poultry.
Molecular gas and dark neutral medium in the outskirts of Chamaeleon
Authors: Liszt H. , Gerin M. , Grenier I.
Published: July 2018

Context. More gas is inferred to be present in molecular cloud complexes than can be accounted for by H I and CO emission, a phenomenon known as dark neutral medium (DNM) or CO-dark gas for the molecular part.

Aims. We aim to investigate whether molecular gas can be detected in Chamaeleon where gas column densities in the DNM were inferred and CO emission was not detected.

Methods. We took λ3 mm absorption profiles of HCO+ and other molecules toward 13 background quasars across the Chamaeleon complex, only one of which had detectable CO emission. We derived the H2 column density assuming N(HCO+)/N(H2) = 3 × 10−9 as before.

Results. With the possible exception of one weak continuum target, HCO+ absorption was detected in all directions, C2H in eight directions and HCN in four directions. The sightlines divide into two groups according to their DNM content, with one group of eight directions having N(DNM) ≳ 2 × 1020 cm−2 and another group of five directions having N(DNM) < 0.5 × 1020 cm−2. The groups have comparable mean N(H I) associated with Chamaeleon 6−7 × 1020 cm−2 and total hydrogen column density per unit reddening 6−7 × 1021 cm−2 mag−1. They differ, however, in having quite different mean reddening 0.33 vs. 0.18 mag, mean N(DNM) 3.3 vs. 0.14 × 1020 cm−2 and mean molecular column density 2N(H2) = 5.6 vs. 0.8 × 1020 cm−2. The gas at more positive velocities is enriched in molecules and DNM.

Conclusions. Overall the quantity of H2 inferred from HCO+ can fully account for the previously inferred DNM along the sightlines studied here. H2 is concentrated in the high-DNM group, where the molecular fraction is 46% vs. 13% otherwise and 38% overall. Thus, neutral gas in the outskirts of the complex is mostly atomic but the DNM is mostly molecular. Saturation of the H I emission line profile may occur along three of the four sightlines having the largest DNM column densities, but there is no substantial reservoir of “dark” atomic or molecular gas that remains undetected as part of the inventory of dark neutral medium.
Revised SED of the triple protostellar system VLA 1623−2417
Authors: Murillo N. M. , Harsono D. , McClure M. , Lai S.-P. , Hogerheijde M. R.
Published: July 2018

Context. VLA 1623−2417 is a triple protostellar system deeply embedded in Ophiuchus A. Sources A and B have a separation of 1.1″, making their study difficult beyond the submillimeter regime. Lack of circumstellar gas emission suggested that VLA 1623−2417 B has a very cold envelope and is much younger than source A, which is generally considered the prototypical Class 0 source.

Aims. We explore the consequences of new ALMA Band 9 data on the spectral energy distribution (SED) of VLA 1623−2417 and their inferred nature.

Methods. We constructed and analyzed the SED of each component in VLA 1623−2417 using dust continuum observations spanning from centimeter to near-infrared wavelengths.

Results. The ALMA Band 9 data presented in this work show that the SED of VLA 1623−2417 B does not peak at 850 µm as previously expected, but instead presents the same shape as VLA 1623−2417 A at wavelengths shorter than 450 µm.

Conclusions. The results presented in this work indicate that the previous assumption that the flux in Herschel and Spitzer observations is solely dominated by VLA 1623−2417 A is not valid, and instead, VLA 1623−2417 B most likely contributes a significant portion of the flux at λ < 450 µm. These results, however, do not explain the lack of circumstellar gas emission and puzzling nature of VLA 1623−2417 B.
Modeling of GMR loops asymmetry in spin valves
Authors: Kurenkov Alexander , Babaizev Georgy , Chechenin Nikolay
Published: July 2018

The regular shape of the magnetoresistance as a function of applied magnetic field, R(H), is important for numerous spin valves applications. Nevertheless, in many practical studies the shape of the R(H) curve is unpredictably complicated. A simple technique, proposed in this paper, allows interpreting the R(H) features and calculating R(H) curves from known hysteresis loops of ferromagnetic layers, composing spin valves. And vice versa, the shape of the hysteresis loops of the composing ferromagnetic layers can be obtained from R(H) curves.The method does not give an insight into the physical factors determining the shape of hysteresis loops, but it is suitable for prompt selection of promising spin valve stacks. A series of spin valve structures was prepared and their magnetoresistance curves were measured. The analysis of the experimental data demonstrates the capacity of the proposed method.
Spin-torque quantization and microwave sensitivity of a nano-sized spin diode
Authors: Demin Gleb , Popkov Anatoly
Published: July 2018

Rectification of microwave signal by the spin-torque diode is very promising for its practical applications in microwave imaging. This is due to a very high sensitivity of magnetic tunnel junction under the bias current, which was previously demonstrated in a number of works [1-3]. The decreasing of cross-sectional area of the spin-torque diode up to the nano-sized dimensions below 10 nm allows one to reach high sensitivity without any bias current. Transverse quantization of electron states in the magnetic nanowire based on nano-sized metallic spin valves and magnetic tunnel junctions can create an additional impact not only on the magnetoresistance, but also on the spin-transfer torque in such structures. In this work we present an analysis of the quantization effect of conductance and spin-transfer torques on the microwave sensitivity of nano-sized spin-torque diodes during the reduction of its cross-sectional area. It was found that the magnetoresistance values up to 130 % can be achieved in a magnetic nanowire containing spin-valve diode with the nonmagnetic metal spacer. As a result, the maximum microwave sensitivity of spin-torque diodes based on these structures can be increased several times that opens the way for the further development of highly sensitive microwave detectors.
The granule size distribution influence in nanocomposites on optical and magnetooptical spectra
Authors: Yurasov Alexey , Gan’shina Elena , Sokolov Alexey , Granovsky Nikita , Zazymkina Daria
Published: July 2018

We have investigated the size effect (quasi-classical size effect) in nanocomposites. It was shown that the size effect can change the amplitude, form and sign of the optical and magnetooptical spectra. We have deduced formulas for size effect and discussed the applications of the distributions for corrected description of optical and magnetooptical properties with regard to the granule size effect. It is very important to consider the distribution on the granule size in size effect. This fact allows to describe optical and magnetooptical spectra of nanocomposites better, especially in near IR due to intraband electron transitions. We have deduced formulas for size effect and discussed applications of the distributions for corrected description of optical and magnetooptical properties with regard to the effect of the granule size.
Waveguide magnetoplasmonic structure based on ferrite garnet film
Authors: Basiladze Georgy , Dolgov Aleksandr , Berzhansky Vladimir , Karavainikov Andrey , Prokopov Anatoly
Published: July 2018

The magnetoplasmonic structure, which is a planar multimode magnetooptical waveguide, 10 μm thick with plasmon resonance SiO2 / Cu coating on the surface is experimentally realized. With the total length of the magnetooptical waveguide 4.6 mm and the length of the SiO2 / Cu coating equal to 3.9 mm, the insertion loss of the structure for TM- and TE-polarized light was 22 and 4 dB, respectively, at a wavelength of 1550 nm. Linearly polarized light was launched into the magneto-optical waveguide using a SMF-28 single-mode optical fiber coupled to the polished input edge of the waveguide. The structure is of interest for use as miniature magnetically controlled modulators of light intensity.
First-principle calculations of the exchange interaction characteristics for multilayer magnetic structures
Authors: Mamonova Marina , Prudnikov Vladimir
Published: July 2018

Magnetic multilayer structures which consist of the ferromagnetic layers separated by nonmagnetic layers with giant magnetoresistance (GMR) are widely used as spintronic devices and read heads of hard disks. In this work magnetic and exchange interaction characteristics of Co/Cu/Co, Ni/Cu/Ni and Fe/Cr/Fe multilayer structures are studied by using VASP software package within the Projector Augmented Wave (PAW) method with generalized-gradient approximation (GGA PBE).The finite temperature magnetism of these structures was studied by Monte-Carlo simulations with the use of the exchange interaction parameters obtained from the ab initio results.
Heat Treatment Effect on Magnetic Microstructure of Fe73.9Cu1Nb3Si13.2B8.9 Thin Films
Authors: Mikhalitsyna Evgeniya , Zakharchuk Ivan , Soboleva Ekaterina , Geydt Pavel , Kataev Vasiliy , Lepalovskij Vladimir , Lähderanta Erkki
Published: July 2018

Fe73.9Cu1Nb3Si13.2B8.9 (Finemet) thin films were deposited on the glass substrates by means of radio frequency sputtering. The films thickness was varied from 10 to 200 nm. Heat treatment at temperatures of 350, 400 and 450 °C were performed for 30 minutes in order to control thin film structural state. The X-ray powder diffractometry revealed that the crystallization of α-FeSi nanograins took place only at 450 °C whilst the other samples stayed in the amorphous state. Relation between the structure and magnetic properties of the films was discussed in the framework of random magnetic anisotropy model and the concept of stochastic magnetic domains. The latter was investigated using magnetic force microscopy (MFM). MFM data showed formation of such magnetic domains only in samples thermally treated at 450 °C. There was a tendency of the magnetic domain size reduction with the thickness decrease.
Magnetic structures of (Gd1-xYx)Mn2Ge2and (Tb1-xYx)Mn2Ge2studied by neutron powder diffraction
Authors: Granovsky Sergey , Gaidukova Irina , Ritter Clemens
Published: July 2018

Magnetic structures and magnetic phase transitions in “naturaly-layered” (Gd1-xYx)Mn2Ge2and (Tb1-xYx)Mn2Ge2compounds have been studied by electrical resistivity and neutron powder diffraction experiments. Hot neutrons were used to probe the magnetic structures of Gd-containing materials. The variable R-Mn exchange forces Gd moments to realign from the tetragonal axis into the plane and back to this axis, whereas canted and tripled structures were detected in the series of compounds containing the highly anisotropic Tb-ion.
Structural and Magnetic Рroperties of Copper Substituted Mg-Ferrites
Authors: Kiseleva Tatiana , Kabanov Vladislav , Ilyushin Alexander , Markov Gennadiy , Sanga Deleg , Hirazawa H.
Published: July 2018

Polycrystalline ferrite powders of Mg1-xCuxFe2O4 (x = 0.2, 0.4, 0.6, 0.8, 1) system synthesized by ceramic technology have been investigated. Samples showed the non-monotonic dependency of heat generation effect in AC magnetic field with increasing concentration of copper. To reveal peculiarities of the structural and magnetic state of the samples and their influence on the heat generation ability we performed a complex study, including X-ray diffractometry, Mössbauer spectroscopy, Scanning electron microscopy, measurements of temperature dependencies of susceptibility and saturation magnetization, hysteresis parameters and FORC. Typical ferrimagnetic character with small coercivity and saturation magnetization was found. We carried out that anomalous influence of Cu2+ ion substitution respectively to the Mg1-xCuxFe2O4 ferrite powder manifested in heat generation ability rise up to x=0.6. The subsequent sharp reducing of this characteristic were accompanied by the main phase crystal structure distortion followed by phase separation to cubic and tetragonal structure. This was matched by in an increase of ferrite particles crystallite size and size distribution appearance. The saturation magnetization and Curie temperature dependencies observed for powders via Cu substitution was explained by phase composition, the cations distributions between ferrite sublattices, modulation of exchange interaction.
Magnetism of purified amorphous carbon
Authors: Komlev Anton , Lähderanta Erkki , Shevchenko Evgeniy , Vorob’ev-Desyatovskii Nikolay
Published: July 2018

In this work, magnetic properties of activated carbon coal, which is also named amorphous carbon, were investigated. Composition and structure analysis was performed by XRD, SEM and EDS techniques. Position and width of peaks on XRD pattern confirmed amorphous structure of coals with small degree of graphitization. Magnetic measurements were performed by SQUID magnetometer. According to thermomagnetic measurements, in part of the samples, antiferromagnetic transition was observed near 120 K. Nature of such phenomena, as well as effect of oxygen and magnetic contaminations on thermomagnetic measurements are discussed referring to similar results from previous researches and data from literature.
Effect of spin-orbital interaction on continuous and jumpwise reversal magnetization in [Mn(II)(HL)(H2O)][Mn(III)(CN)6]·2H2O molecular ferrimagnet
Authors: Kirman Marina , Morgunov Roman
Published: July 2018

Magnetic jumps were revealed during the magnetization reversal of [Mn(II)(HL)(H2O)][Mn(III)(CN)6]·2H2O molecular ferrimagnet. Amplitudes of the jumps were 0.01 – 0.1 % of the saturation magnetization. Fourier transform of the time series of jumps magnetization indicates that frequency spectrum is close to the white noise. Statistic distribution of the jumps versus time reveals the appearance of the most jumps at the beginning of the demagnetization. Effect of spin-orbit coupling on statistical distribution of magnetization jumps was considered by comparison of two compounds with different single ion anisotropies. The increase of spin-orbit interaction leads to the decrease of power of spectral density of magnetization jumps.
Stress-induced magnetic domain structure in DyFe11Ti compound
Authors: Semenova Elena , Lyakhova Marina , Karpenkov Dmitriy , Kuznetsova Yulia , Karpenkov Alexey , Skokov Konstantin
Published: July 2018

In this work, we present the results of the DyFe11Ti compound magnetic domain structure (DS) exploration. It was found that mechanical polishing leads to a change of the anisotropy of the surface layer, which affects the magnetic DS configuration. It is established that the equilibrium structure of the surface domains is restored through time under unchanged external conditions. It is suggested that the mechanism of DS relaxation has thermal fluctuation nature.
The transformation of the magnetostructural phase transition with Ti addition in Gd5Si2Ge2
Authors: Nikitin Sergey , Smirnov Andrey , Bogdanov Anatoly , Ovchenkova Ioulia
Published: July 2018

The magnetic, thermal expansion and magnetostriction measurements of Gd5-xTixSi2Ge2 (x=0, 0.05, 0.1) compounds have been carried out in wide range of fields and temperatures. It is found that Ti addition leads to the disappearance of the structural transformation, the change of the order of the phase transition and the decrease of the hysteresis. The large positive magnetostriction associated with the structural phase transition in Gd5Si2Ge2 changes to the small negative one associated with the magnetic phase transition in Gd4.9Ti0.1Si2Ge2. The linear dependence of volume magnetostriction on the square of magnetization obtained for all investigated compounds is explained using the thermodynamic theory.
Structural and magnetic properties of heusler alloys Pd2MnZ (Z=Ga, Ge, As): AB INITIO study
Authors: Miroshkina Olga , Zagrebin Mikhail , Sokolovskiy Vladimir , Buchelnikov Vasiliy
Published: July 2018

In this work, we report results of ab initio and Monte Carlo investigations of structural and magnetic properties in a series of Heusler compositions Pd2MnZ (Z = Ga, Ge, As). It was found that for Pd2MnGa and Pd2MnAs, the stable martensitic state is realized on the contrast with Pd2MnGe. The equilibrium lattice parameters for the series of Pd2MnZ (Z = Ga, Ge, As) compounds increase with increasing the number of valence electrons per atom (e/a ratio). Having calculated total magnetic moments and magnetic exchange parameters from ab initio methods, the Curie temperature for Pd2Mn-based alloys has been estimated in the framework of Monte Carlo simulations of Heisenberg model.
Magnetocaloric properties of Gd(Co1-xFex)2 compounds, with x ≤ 0.60
Authors: Anikin Maksim , Tarasov Evgeniy , Kudrevatykh Nikolay , Zinin Aleksander
Published: July 2018

In this paper the results of specific magnetization and magnetocaloric effect (MCE) measurements for Gd(Co1-xFex)2 system upon the Co substitution by Fe for the x = 0 ÷ 0.60 range are presented. Phase composition was controlled by X-ray diffraction analysis. MCE has been studied within the temperature range of 300-850 K in magnetic fields up to 17 kOe by the magnetic entropy change calculation (ΔSm). It was found that in contrast to the previously studied R(Co-Fe)2 compounds where R = Dy, Ho, Er, an ordinary symmetrical peak of ΔSm(T) in the vicinity of TC is observed for presented samples. Additionally, the MCE comparison of Gd(Co0.88Fe0.12)2 with that for the isostructural Gd(Ni0.88Fe0.12)2 compound having a plateau-like ΔSm temperature dependence is given. The obtained results are discussed.
Magnetic phase diagrams of Gd-H, Tb-H, Dy-H systems
Authors: Chzhan Victoria , Tereshina Irina , Burkhanov Gennady , Politova Galina , Drulis Henryk
Published: July 2018

We study the impact of hydrogen impurity on the magnetic phase transition temperatures of the high purity rare-earth metals Gd, Tb and Dy. Prior to hydrogenation, the rare earths were purified by the vacuum distillation method. Hydrogenation was carried out using a Sievert-type apparatus. Magnetic phase diagrams were constructed based on the thermomagnetic analysis.
Quantum effects in magnetotransport of InGaAs quantum wells with remote
Mn impurities
Authors: Oveshnikov Leonid , Morgun Leonid , Nekhaeva Elena , Kulbachinskii Vladimir , Aronzon Boris
Published: July 2018

We have studied magnetoresistance and Hall effect of GaAs/InxGa1−xAs quantum wells with remote Mn impurity. Temperature and magnetic field dependencies of samples resistivity indicate several effects related to the magnetic subsystem. Shubnikov - de Haas oscillations indicate the presence of several types of regions in conduction channel with significantly different hole mobilities. We discussed the impact of magnetic impurities on quantum corrections to conductivity by comparing our results with the data for similar non-magnetic structures. Our results suggest that the presence of Mn atoms leads to the damping of quantum corrections in in the investigated structures.
Superparamagnetic behavior of MOCVD grown ZnO:Co films
Authors: Kytin Vladimir G. , Maximova Olga V. , Kulbachinskii Vladimir A. , Burova Lidia I. , Kaul Andrey R. , Bandyopadhya Sudipta , Ahmed Azaharuddin , Banerjee Aritra
Published: July 2018

Temperature and field dependences of magnetization have been measured for Co-doped ZnO films with different Co content grown by MOCVD on sapphire substrates. Measured field dependences of magnetization show ferromagnetic-like hysteresis loops and paramagnetic contribution. Coercive field decreases with an increase of Co content and temperature. The difference between temperature dependences of magnetization measured in zero field cooling and field cooling conditions was observed in the temperature range from 2 K to 300 K indicating superparamagnetic behaviour of the films. The distribution of blocking temperatures extracted from the temperature dependences of magnetization is broad and shifts to the low blocking temperatures with an increase of Co content
Diluted Magnetic Semiconductors InFeSb Prepared by Laser Ablation: Spectroscopic and Microscopic Investigations
Authors: Gan’shina Elena , Golik Leonard , Kun’kova Zoya , Zykov Georgy , Rukovishnikov Alexander , Temiryazeva Marina , Lesnikov Vladimir , Markin Yuri
Published: July 2018

We report optical and magneto-optical results as well as atomic force microscopy (AFM) and magnetic force microscopy (MFM) results for InFeSb samples prepared by laser ablation. AFM and MFM studies have revealed the presence of magnetic particles on the samples surface, whose sizes depend on the Fe content and substrate temperature. It has found that both optical and magneto-optical spectra are superposition of spectra from the doped InFeSb layers and particles on their surface.
Electroinduced magnetic bubble domain nucleation
Authors: Kulikova Daria , Gareev Timur , Nikolaeva Elena , Pyatakov Alexander
Published: July 2018

The magnetoelectric properties of micromagnetic structures in iron garnet films manifest themselves in electrically induced displacement of domain walls and magnetic bubble domains nucleation. In this paper we found the condition of the electrically induced bubble domain nucleation in terms of critical electric field, magnetic bias and temperature. The collapse of magnetic bubble domain under the action of electric field pulse is also demonstrated.
Microstructure formation and macroscopic dynamics of ferrofluid emulsion in rotating magnetic field
Authors: Kolesnikova Anastasia , Zakinyan Arthur , Dikansky Yuri
Published: July 2018

The ferrofluid-in-water emulsion has been produced and studied. The microstructure formation in a flat layer of such emulsion under the action of in-plane rotating magnetic field has been observed. Several microstructure types have been found such as chain-like aggregates, disc-like clusters, branching and space-occupying structures. The time evolution of the formation process has been analysed. The revealed microstructures have been computationally investigated by molecular dynamics simulations. The microstructure dynamics in ferrofluid emulsions manifests itself in macroscopic mechanical effects. We analysed the appearance of macroscopic torque on a ferrofluid emulsion sample in a rotating magnetic field. The value of the torque has been measured as a function of magnetic field strength and frequency.
Heterogeneity of population of microorganisms grown in presence of iron oxide maghemite nanoparticles
Authors: Denisova Tatyana P. , Simonova Elena V. , Kokorina Lubov A. , Maximova Evgenia N. , Samatov Oleg M. , Safronov Alexander P. , Kurlyandskaya Galina V.
Published: July 2018

In this work γ-Fe2O3 MNPs were obtained by laser target evaporation and water based suspensions were prepared. Maximum permissive dose of iron in water (MPD) is 0.3 mg/L. It was found that 100 MPD dose of iron induces formation of non-typical colonies after 72 or 96 hours exposition: against a background of small black colonies large white colonies appeared due to a disruption in tyrosine synthesis. Multiple re-cloning of the white colonies grown with MNPs showed that they retained their properties both under standard conditions (temperature of 24 °C) and at the temperatures up to 37o C. E.nigrum grown with MNPs demonstrated very scant extension of small colonies at the cultivation temperature of 24o C, their growth was completely blocked at 37°C. Significant changes in the structure of the population were noted. First of all, large cells with pronounced aggregation were observed among the black colonies. These aggregates consisted of large cells connected to each other by matrix. In the white colonies the appearance of very long threadlike cells connecting different groups of the cells establishing an intercellular communication was evident. Fe2O3 MNPs induce an increase in the heterogeneity of the population, expressed as a change in morpho-physiological states.
Modelling of thin film magnetoimpedance sensitive element designed for biodetection
Authors: Volchkov S.O. , Chlenova A.A. , Lepalovskij V.N.
Published: July 2018

Magnetic soft matter (ferrofluids or ferrogels) is one of the rapidly growing areas of research and applications including magnetic biosensing. Giant magnetoimpedance is the effect with proven capacity to magnetic label detection. In this work, we describe a universal model to simulate conditions of magnetic biodetection and to check its validity with giant magnetoimpedance sensitive element based on magnetic multilayer. Finite element method allows calculations of high-frequency current distribution using the Maxwell's equations taking into account the magnetodynamics of iron oxide water-based ferrofluid in small channels similar to the blood vessels. The modelling was realized with the licensed software Comsol©. The calculations were performed on a specialized engineering server based on four processors Intel Xeon E5 and 124 Gb RAM, adapted for parallel computations and suitable for description of individual layers with nanometer dimensions for the number of elements in the mesh structure above 106 cells. The designed model allows calculations of the current density, the outside magnetic flux, resistivity, etc. for each one of the created cells and total values by integration of sub-domains. One can quantitatively describe concentration of ferrofluid, velocity and pressure in the blood vessel. These changes affecting on the giant magnetoimpedance of the FeNi-based multilayer were both calculated and measured.
Critical properties of 2d disordered 3-state antiferromagnetic potts model ON TRIANGULAR LATTICE
Authors: Murtazaev A.K. , Babaev A.B. , Ataeva G.Y.
Published: July 2018

By introducing a small amount of non-magnetic impurities into an antiferromagnetic (AF) two-dimensional (2D) Potts model on a triangular lattice it is that the impurities in spin systems described by this model result in the change of a first order to a second-order phase transition. The systems with linear sizes L × L = N, L = 9-144 are considered. Investigations are performed using the standard Metropolis algorithm along with Monte-Carlo single-cluster Wolff algorithm. On the basis of the theory of finite-size scaling, critical exponents (CE) are calculated: the heat capacity α, the susceptibility γ, the order parameter β, and the CE of the correlation radius ν.
Non-equilibrium critical dynamics of low-dimensional magnetics and multilayer structures
Authors: Prudnikov Pavel V. , Prudnikov Vladimir V. , Danilova Alena Yu. , Borzilov Vadim O. , Baksheev Georgy G.
Published: July 2018

The Monte Carlo simulation of the critical behavior of multilayer structures based on anisotropic Heisenberg model is performed. The influence of the uniaxial anisotropy on the critical behavior of the thin Heisenberg-like film is described. The investigation of non-equilibrium critical behavior of multilayer structure which correspond to the nanoscale superlattice Co/Cu demonstrates that the aging effects can be observed in a wider temperature range than for bulk magnetic systems.
Living on mars: how to produce oxygen and fuel to get home
Authors: Guerra Vasco , Silva Tiago , Guaitella Olivier
Published: July 2018

Sending a manned mission to Mars is one of the next major steps in space exploration.
Creating a breathable environment, however, is a substantial challenge. A sustainable
oxygen supply on the red planet can be achieved by converting carbon dioxide directly from
the Martian atmosphere. A new solution to do so is on the way: plasma technology.
Development of Structural Dynamic Analysis Software of Truss Structure Using Monte Carlo Finite Element Method
Authors: Ichsan Muhammad , Handayanu  , Wisudawan Agro
Published: July 2018

Structural reliability analysis is increasingly used in conjunction with the design of offshore structures which have high uncertainty. Two problems i.e. reliability and complexity of the structures resulted in Monte Carlo Finite Element Method (MCFEM) method of analysis. In the first part of this research, we will show results comparison between deterministic analysis software made in Proposed Software and analysis using commercial established software. In this case, object will assume as a simple Plane Truss structure with multi degrees of freedom applied dynamic load in the support of structure. The second part after obtaining a deterministic result compared by commercial software, further we will apply MCFEM algorithm to the deterministic analysis algorithm which has been made. The results of this research, contains a new procedure in the form of reliability simulation algorithm by combining Monte Carlo Simulation and Finite Element Method in Dynamic Model.