bluuebunny/crossref_metadata_2025 huggingface dataset:
Radiation-induced effects on the extraction properties of hexa-n-octylnitrilo-triacetamide (HONTA) complexes of americium and europium
Authors: Toigawa Tomohiro , Peterman Dean R. , Meeker David S. , Grimes Travis S. , Zalupski Peter R. , Mezyk Stephen P. , Cook Andrew R. , Yamashita Shinichi , Kumagai Yuta , Matsumura Tatsuro , Horne Gregory P.
Published: December 2020

The radiation stability of the candidate An(III)/Ln(III) separation ligand hexa-n-octylnitrilo-triacetamide (HONTA) under envisioned process conditions was investigated using a combination of solvent test loop gamma and pulsed electron irradiation.
Does triclosan adsorption on polystyrene nanoplastics modify the toxicity of single contaminants?
Authors: Parenti C. C. , Magni S. , Ghilardi A. , Caorsi G. , Della Torre C. , Del Giacco L. , Binelli A.
Published: December 2020

The risk associated to the action of nanoplastics as carriers of environmental pollutants was investigated by a multi-tiered approach.
Deoiled sunflower seeds ameliorate depression by promoting the production of monoamine neurotransmitters and inhibiting oxidative stress
Authors: Lu Xiaomeng , Ce Qi , Jin Long , Zheng Jie , Sun Mei , Tang Xue , Li Duo , Sun Jin
Published: December 2020

SFS may alleviate depression by increasing aromatic neurotransmitters, improving oxidative stress and inflammation and regulating metabolism.
Mussel foot protein inspired tough tissue-selective underwater adhesive hydrogel
Authors: Fan Xianmou , Fang Yan , Zhou Weikang , Yan Liyu , Xu Yuehua , Zhu Hu , Liu Haiqing
Published: December 2020

Novel underwater tissue-selective adhesive hydrogels with adhesion energy to wet porcine skin of ∼1011 J m−2 were made by bio-mimicking Mfps.
One-pot asymmetric synthesis of a hexahydrophenanthridine scaffold containing five stereocenters via an organocatalytic quadruple-cascade reaction
Authors: Zhang Xiao-Long , Feng Kai-Xiang , Hu Jian-Liang , Shen Qiao-Yu , Huang Wang-Sheng , Xia Ai-Bao , Li Chen , Xu Dan-Qian
Published: December 2020

An organocatalytic enantioselective aza-Michael-Michael-Michael/aldol cyclization quadruple-cascade reaction of 2-amino-β-nitrostyrenes and α,β-unsaturated aldehydes has been developed for the construction of fully substituted hexahydrophenanthridine.
A novel H2S releasing-monastrol hybrid (MADTOH) inhibits L-type calcium channels
Authors: Braga Taniris Cafiero , de Jesus Itamar Couto Guedes , Soares Kathleen Viveiros , Guatimosim Silvia , da Silva Neto Leonardo , da-Silva Cristiane Jovelina , Modolo Luzia Valentina , Menezes Filho José Evaldo Rodrigues , Rhana Paula , Cruz Jader Santos , de Fátima Ângelo
Published: December 2020

A new alleged monastrol-H2S releasing hybrid, named MADTOH, was designed based on the structure of monastrol (M) and 5-(4-hydroxyphenyl)-3H-1,2-dithiole-3-thione (ADTOH) and synthesized in 7.8% overall yield.
A hydrophobic polymer stabilized CsPbBr3 sensor for environmental pollutant detection
Authors: Deng Pengyin , Wang Wei , Liu Xiqing , Wang Liang , Yan Yongsheng
Published: December 2020

The detection of o-nitrophenol in the environment is of great significance to environmental protection.
A robust heterogeneous Co-MOF catalyst in azide–alkyne cycloaddition and Friedel–Crafts reactions as well as hydrosilylation of alkynes
Authors: Wu Tai-Xue , Jia Jun-Song , Luo Wei , Bian He-Dong , Tang Hai-Tao , Pan Ying-Ming , Huang Fu-Ping
Published: December 2020

A robust Co(ii) MOF with high stability was prepared to promote the azide–alkyne cycloaddition reaction, Friedel–Crafts reactions of indoles and hydrosilylation reactions of alkynes.
Ionic liquid/H2O two-phase synthesis and luminescence properties of BaGdF5:RE3+ (RE = Ce/Dy/Eu/Yb/Er) octahedra
Authors: Liu Wei , Sun Qi , Zou Haifeng , Zhang Xiangting , Xiao Xue , Shi Zhan , Song Yanhua
Published: December 2020

BaGdF5:RE3+ (RE = Ce/Dy/Eu) octahedra were synthesized via a facile ionic liquid/H2O two-phase system. Multi-color emissions have been realized.
Solid phase extraction procedure coupled with the chiral LC-ESI-MS/MS method for the enantioseparation and determination of butoconazole enantiomers in rat plasma and tissues: application to the enantioselective study on pharmacokinetics and tissue distribution
Authors: Ma Siman , Wang Lina , Guo Guoxian , Yu Jia , Guo Xingjie
Published: December 2020

A significant enantioselective difference between (−)- and (+)-butoconazole existed in the stage of not only pharmacokinetics but also tissue distribution.
Tetrakis-(N-methyl-4-pyridinium)-porphyrin as a diamagnetic chemical exchange saturation transfer (diaCEST) MRI contrast agent
Authors: Chakraborty Subhayan , Das Mainak , Srinivasan A. , Ghosh Arindam
Published: December 2020

Easily synthesizable tetrakis-(N-methyl-4-pyridinium)-porphyrin as a diaCEST agent that shows nearly pH independent good contrast in a wide range of pH.
Synthesis of C2 oxygenates from syngas over UiO-66 supported Rh–Mn catalysts: the effect of functional groups
Authors: Han Ying , Yu Jun , Guo Qiangsheng , Xiao Xiuzhen , Guo Xiaoming , Mao Haifang , Mao Dongsen
Published: December 2020

UiO-66 and its modified forms were used as supports to prepare Rh–Mn catalysts, and their effects on CO hydrogenation were investigated.
Polyelectrolyte–calcium complexes as a pre-precursor induce biomimetic mineralization of collagen
Authors: Zhou Zihuai , Zhang Leiqing , Li Jiachen , Shi Ying , Wu Zhifang , Zheng Haiyan , Wang Zhe , Zhao Weijia , Pan Haihua , Wang Qi , Jin Xiaogang , Zhang Xing , Tang Ruikang , Fu Baiping
Published: December 2020

Rapid biomimetic intrafibrillar mineralization of collagen was induced by polyelectrolyte–calcium complexes as a pre-precursor.
Injection-seeded high-repetition-rate short-pulse micro-laser based on upconversion nanoparticles
Authors: Jiao Jiannan , Zhou Donglei , Li Shufan , Low Mun Ji , Gao Yi , An Jianing , Su Pei-Chen , Kim Seung-Woo , Kim Seungchul , Kim Kyujung , Suchand Sandeep C. S. , Kim Young-Jin
Published: December 2020

We report a high-repetition-rate, short-pulse, upconversion micro-laser prepared by the fast thermal quenching of lanthanide-doped upconversion nanoparticles (UCNPs).
Building biobased, degradable, flexible polymer networks from vanillin via thiol–ene “click” photopolymerization
Authors: Ge Meiying , Miao Jia-Tao , Zhang Kai , Wu Yadong , Zheng Longhui , Wu Lixin
Published: December 2020

A new biobased allyl ether monomer with acetal groups is synthesized from renewable vanillin for building flexible transparent thiol–ene networks with good degradability under mild acidic conditions.
Co-CeOx nanoparticles anchored on a nitrogen-doped carbon nanosheet: a synergistic effect for highly efficient hydrolysis of sodium borohydride
Authors: Yao Longhua , Li Xiugang , Peng Wenfang , Yao Qilu , Xia Jianhui , Lu Zhang-Hui
Published: December 2020

Amorphous and electron-rich Co-CeOx nanoparticles anchored on a N-doped porous carbon nanosheet show remarkable catalytic performance for the hydrolysis of sodium borohydride.
Rapid aqueous-phase synthesis of highly stable K0.3Bi0.7F2.4 upconversion nanocrystalline particles at low temperature
Authors: Chen Dongxun , Bi Jianqiang , Wang Weili , Wang Xiaojia , Zhang Yuhai , Liang Yanjie
Published: December 2020

Lanthanide-doped K0.3Bi0.7F2.4 nanocrystalline particles are synthesized through an ultrafast (only 1 min) and aqueous-phase chemical method at low temperature (room temperature ∼ 90 °C), which can be used as pigments for anti-counterfeiting.
A one-pot stepwise approach to axially chiral quinoline-3-carbaldehydes enabled by iminium–allenamine cascade catalysis
Authors: Shao You-Dong , Han Dan-Dan , Dong Meng-Meng , Yang Xin-Ru , Cheng Dao-Juan
Published: December 2020

An organocatalytic atroposelective annulation between 2-(tosylamino)aryl ketones and 2-alkynals for the construction of enantioenriched axially chiral 4-arylquinoline-3-carbaldehydes is achieved.
Novel methods for the rapid detection of trace tetracyclines based on the fluorescence behaviours of Maillard reaction fluorescent nanoparticles
Authors: Si Xue-jing , Wang Hong-ling , Wu Tun-hua , Wang Ping
Published: December 2020

The Maillard reaction and its fluorescent products have attracted widespread attention in the field of food safety and biology.
Convenient conversion of hazardous nitrobenzene derivatives to aniline analogues by Ag nanoparticles, stabilized on a naturally magnetic pumice/chitosan substrate
Authors: Taheri-Ledari Reza , Mirmohammadi Seyedeh Shadi , Valadi Kobra , Maleki Ali , Shalan Ahmed Esmail
Published: December 2020

Silver nanoparticles (Ag NPs), as an effective catalyst for the reduction process of nitrobenzene derivatives to non-hazardous and useful aniline derivatives, are conveniently synthesized on an inherently magnetic substrate.
Student-generated PowerPoint animations: a study of student teachers’ conceptions of molecular motions through their expressed models
Authors: Guspatni Guspatni
Published: December 2020

Student-generated drawings are known to be effective in building and revealing students’ conceptions of chemistry. Some chemistry concepts, moreover, include changes and processes that cannot be merely represented by static drawings. Computer-based animations are needed to represent the dynamics. In this study, 25 chemistry student teachers, who had studied the concept of molecular motions and had taken the course of Chemistry Instructional Media and Technology, were assigned to make expressed models of water molecules’ motions in the form of animations with PowerPoint, the most familiar program and installed on students’ computers. Students were also assigned to give written explanations of the three molecular motions. Within one month, both tasks were due simultaneously. Students’ expressed models were analysed based on Custom Animation features used for the animations, while students’ written explanations were analysed based on the typology of the sentences. It was found that all students appeared to hold correct conceptions of translation; many students appeared to hold correct conceptions of rotation; and almost all students appeared to hold misconceptions of vibration. There was no substantial difference between PowerPoint Animations and written explanations in revealing students’ conceptions of molecular motions. However, there were several inconsistencies of students’ conceptions that occurred in both tasks. For example, several students who incorrectly explained rotation as circular movements displayed a spinning of the particle on its own axis in the animation. Students’ expressed models in PowerPoint Animations provided other information unrevealed in their written explanations. These pieces of information included types of molecular motion in different phases, simultaneous motions, and deflections of molecules after collisions. The analysis of students’ expressed models in PowerPoint Animations can be an effective approach to reveal students’ conceptions of molecular dynamics if accompanied by adequate tutorials on the animation program, clear instructions, and guidance to get learning resources.
Two helices from one chiral centre – self organization of disc shaped chiral nanoparticles
Authors: Yu Huanan , Qu Wentao , Liu Feng , Mehl Georg H.
Published: December 2020

Gold nanoparticles (NPs) were surface functionalized with hexanethiol groups and chiral nematic discogen ligands. A superlattice, liquid crystal behaviour and helix formation of the discs and a second helical organisation of the NPs were detected.
Stable monovalent aluminum(i) in a reduced phosphomolybdate cluster as an active acid catalyst
Authors: Zhang Ya-Qi , Zhou Lai-Yun , Ma Yuan-Yuan , Dastafkan Kamran , Zhao Chuan , Wang Lan-Zhi , Han Zhan-Gang
Published: December 2020

Monovalent aluminum(i) species was successfully stabilized using a reduced phosphomolybdate scaffold as a dual-acid catalyst for a four-component domino reaction.
The role of entropy in wetting of polymer brushes
Authors: Mensink Liz I. S. , de Beer Sissi , Snoeijer Jacco H.
Published: December 2020

The wetting of polymer brushes exhibits a much richer phenomenology than wetting of normal solid substrates.
Intestines of non-uniform stiffness mold the corners of wombat feces
Authors: Yang Patricia J. , Lee Alexander B. , Chan Miles , Kowalski Michael , Qiu Kelly , Waid Christopher , Cervantes Gabriel , Magondu Benjamin , Biagioni Morgan , Vogelnest Larry , Martin Alynn , Edwards Ashley , Carver Scott , Hu David L.
Published: December 2020

The bare-nosed wombat (Vombatus ursinus) is a fossorial, herbivorous, Australian marsupial, renowned for its cubic feces.
Tough hybrid microgel-reinforced hydrogels dependent on the size and modulus of the microgels
Authors: Li Chun , Zhou Xiaohu , Zhu Lifei , Xu Ziyao , Tan Peng , Wang Haifei , Chen Guokang , Zhou Xuechang
Published: December 2020

Hybrid microgel-reinforced hydrogels with the size and modulus effect have the same toughening mechanism as the bulk double network hydrogels.
Supramolecular self-assembly of the γ-cyclodextrin and perfluorononanoic acid system in aqueous solution
Authors: Zhang Juan , Liu Cuiting , Hu Xinyue , Lv Qichao , Zhang Hongsheng , Pi Benxiang , Yang Zihao , Lin Meiqin
Published: December 2020

Schematic representation of aggregates formed by the self-assembly of PFNA@γ-CD complexes.
Electrochemical breakdown in hydrogel ionotronic devices
Authors: Jia Kun , Li Xiang , Wang Yecheng
Published: December 2020

Ion–electron exchange at the metal–hydrogel interface caused by the electrochemical reaction limits the lifetime of hydrogel ionotronic devices, namely electrochemical breakdown.
The wormlike micelles formed using an ionic liquid surfactant and polar organic solvents at low temperature without additives and their lubricant properties
Authors: Cao Huijiao , Xu Wenlin , Guo Xia
Published: December 2020

Wormlike micelles (or reverse wormlike micelles) are flexible cylindrical chains that are normally formed in water (or a nonpolar organic solvent) at 25.0 °C or above; the formation of wormlike micelles at lower temperatures is rare.
Strengthening gelatin hydrogels using the Hofmeister effect
Authors: Wang Xujie , Qiao Congde , Jiang Song , Liu Libin , Yao Jinshui
Published: December 2020

Citrate anions make the gelatin chains become close to each other and result in the formation of triple helices and crystalline regions.
Near-infrared light-induced photoisomerization and photodissociation of a chiral fluorescent photoswitch in cholesteric liquid crystals assisted by upconversion nanoparticles
Authors: Juan Ao , Lin Siyang , He Yanrong , Fan Qingyan , Guo Jinbao
Published: December 2020

Upconversion-luminescence-induced irreversible photoisomerization and photodissociation of a chiral fluorescent photoswitch has been demonstrated to construct NIR-sensitive reflective-photoluminescent dual mode CLC cells.
Recent advances in layered Ln2NiO4+δnickelates: fundamentals and prospects of their applications in protonic ceramic fuel and electrolysis cells
Authors: Tarutin Artem P. , Lyagaeva Julia G. , Medvedev Dmitry A. , Bi Lei , Yaremchenko Aleksey A.
Published: December 2020

The review represents a comprehensive and critical analysis of the state-of-the-art knowledge on layered Ruddlesden–Popper nickelates as promising electrodes for protonic ceramic electrochemical cells.
Unprecedented gas separation performance of a difluoro-functionalized triptycene-based ladder PIM membrane at low temperature
Authors: Ma Xiaohua , Zhu Zhiyang , Shi Wenxiong , Ji Wenhui , Li Jianxin , Wang Yingge , Pinnau Ingo
Published: December 2020

A novel fluorinated triptycene-derived ladder PIM (DFTTB) showed an unprecedented O2/N2 selectivity of 10.1 and O2 permeability of 137 barrer at −30 °C that provides new opportunities for low temperature air separation applications.
Bandgap engineering in benzotrithiophene-based conjugated microporous polymers: a strategy for screening metal-free heterogeneous photocatalysts
Authors: Han Songjie , Li Ziping , Ma Si , Zhi Yongfeng , Xia Hong , Chen Xiong , Liu Xiaoming
Published: December 2020

A metal-free photocatalyst was screened from the same series of CMP materials through the bandgap engineering strategy. It exhibited excellent photocatalytic performances for the synthesis of benzimidazoles with high activity and recyclability.
Beyond traditional water splitting for energy-efficient waste-to-hydrogen conversion with an inorganic–carbon hybrid nanosheet electrocatalyst
Authors: Li Yapeng , Wang Yixuan , Liu Yi , Qian Qizhu , Li Ziyun , Mu Yang , Zhang Genqiang
Published: December 2020

The waste-to-hydrogen system has been demonstrated with the RuP2-carbon hybrid nanosheets as the cathode electrocatalyst of microbial electrolysis cell, which merely needs 0.18 V to generate hydrogen, far below than the traditional water electrolysis.
Confining Sb nanoparticles in bamboo-like hierarchical porous aligned carbon nanotubes for use as an anode for sodium ion batteries with ultralong cycling performance
Authors: Kang Chao , Zhou Shengping , Liu Jilei , Zhu YanFei , Hu Aiping , Tang Qunli , Zhang Yan , Chen Xiaohua , Tao Tao
Published: December 2020

Sb nanoparticles are confined in bamboo-like hierarchical porous aligned carbon nanotubes for use as an anode for sodium ion batteries with ultralong cycling performance.
Photo-responsive functional gold nanocapsules for inactivation of community-acquired, highly virulent, multidrug-resistant MRSA
Authors: Thorat Nanasaheb D. , Dworniczek Ewa , Brennan Grace , Chodaczek Grzegorz , Mouras Rabah , Gascón Pérez Victoria , Silien Christophe , Tofail Syed A. M. , Bauer Joanna
Published: December 2020

The indiscriminate and sporadic use of antibiotics has contributed to the emergence of drug resistance phenomenon in bacteria including but not limited toStaphylococcus aureus. Functional gold nanocapsules with phototherapy is an alternative to.
Fine-tuned dehydration by trehalose enables the cryopreservation of RBCs with unusually low concentrations of glycerol
Authors: Shen Lingxiao , Guo Xiaojie , Ouyang Xilin , Huang Yu , Gao Dayong , Zhao Gang
Published: December 2020

We regulated the amount of trehalose and combined it with glycerol to achieve unusually low glycerol concentrations in the cryopreservation of RBCs compared with traditional methods.
Ubiquinone-BODIPY nanoparticles for tumor redox-responsive fluorescence imaging and photodynamic activity
Authors: Hwang Byunghee , Kim Tae-Il , Kim Hyunjin , Jeon Sungjin , Choi Yongdoo , Kim Youngmi
Published: December 2020

A ubiquinone-BODIPY photosensitizer self-assembles into nanoparticles (PS-Q-NPs) and undergoes selective activation within the highly reductive intracellular environment of tumors, resulting in “turn-on” fluorescence and photosensitizing activities.
Synthesis and size-dependent spin crossover of coordination polymer [Fe(Htrz)2(trz)](BF4)
Authors: Siddiqui Shiraz Ahmed , Domanov Oleg , Schafler Erhard , Vejpravova Jana , Shiozawa Hidetsugu
Published: December 2020

The synthesis of quality single crystals is central to materials chemistry for optical, magnetic, and electronic device applications.
The effect of ZnO preparation on the performance of inverted polymer solar cells under one sun and indoor light
Authors: Sung Yun-Ming , Akbar Abdul Khalik , Biring Sajal , Li Chia-Feng , Huang Yu-Ching , Liu Shun-Wei
Published: December 2020

In this work, we have investigated in depth the effect of a ZnO layer in between ITO and the active layer of PTB7:PC71BM-based polymer solar cells on the device performance under 1 sun and indoor light conditions.
Synthesis of CsPbBr3 perovskite nanocrystals with acoustically actuated millisecond mixing
Authors: Ng Chun Kiu , Deng Hao , Li Hanchen , Yin Wenping , Alan Tuncay , Jasieniak Jacek J.
Published: December 2020

Improved morphology and size homogeneity of CsPbBr3 perovskite nanocrystals synthesised at low-temperature through highly efficient acoustic mixing in a microfluidic platform.
Synthesis of gold-coated magnetic conglomerate nanoparticles with a fast magnetic response for bio-sensing
Authors: Mehdipour Milad , Gloag Lucy , Bennett Danielle T. , Hoque Sharmin , Pardehkhorram Raheleh , Bakthavathsalam Padmavathy , Gonçales Vinicius R. , Tilley Richard D. , Gooding J. Justin
Published: December 2020

The versatile qualities of gold coated magnetic nanoparticles for both optical and electrochemical detection, as well as the separation of analytes, make them an excellent choice for ultrasensitive biosensing applications.
A large-area, flexible, high contrast and long-life stable solid-state electrochromic device driven by an anion-assisted method
Authors: Wang Lebin , Zhang Xiang , Chen Xi , Li Xiaobai , Zhao Yingming , Li Wenjie , Zhao Jiupeng , Chen Zhiyong , Li Yao
Published: December 2020

The H2O content in Li+ electrolyte can regulate the EC properties of NiO and ECDs. Large area flexible ECDs are investigated, exhibiting high optical modulation and long-life stability.
Stability and efficiency improved perovskite solar cells through tuning the hydrophobicity of the hole transport layer with an organic semiconductor
Authors: Xu Chongyang , Liu Zhihai , Lee Eun-Cheol
Published: December 2020

We integrated a p-type organic semiconductor with the hole transport layer of inverted perovskite solar cells for improvements in stability and efficiency.
High mobility organic semiconductor for constructing high efficiency carbon nitride heterojunction photocatalysts
Authors: Yi Yan , Wang Siyu , Zhang Hantang , Liu Jie , Lu Xiuqiang , Jiang Lang , Sui Chengji , Fan Hai , Ai Shiyun , Sun Jianwu
Published: December 2020

High-mobility organic semiconductor CuPc is used to construct CN/CuPc heterojunction photocatalysts, showing enhanced photocatalytic performances. This work proves the prospect of high-mobility organic semiconductors in photocatalysis.
A solution-processable wholly-aromatic bipolar host material for highly efficient blue electroluminescent devices
Authors: Yuan Jie , Jiang He , Yang Qingqing , Xiang Yuan , Zhang Ying , Dai Yizhong , Li Ping , Zheng Chao , Xie Guohua , Chen Runfeng
Published: December 2020

Highly efficient blue electroluminescent devices were realized by using a solution-processable wholly-aromatic bipolar host material prepared through an insulating C(sp3) bridge linking strategy.
Interfacial fluorine migration-induced low leakage conduction in PVA based high-k composites with V2C MXene-SWCNT switchboard-like ceramic via ab initio MD simulations
Authors: Deng Qihuang , Chen Binghe , Bo Maolin , Feng Yefeng , Huang Yuehao , Zhou Junquan
Published: December 2020

Using V2C-CNT switchboard-like hybrid particles as filler for preparing promising composite dielectrics based on fluorine-migration effect.
Boosting the performance of CsPbBr3-based perovskite light-emitting diodes via constructing nanocomposite emissive layers
Authors: Jin Guangrong , Zhang Dengliang , Pang Peiyuan , Ye Ziqing , Liu Tanghao , Xing Guichuang , Chen Jiangshan , Ma Dongge
Published: December 2020

The construction of quasi-2D CsPbBr3/Cs4PbBr6 nanocomposites enables significantly enhanced performance of CsPbBr3-based PeLEDs.
The Arabidopsis locus AT3G03890 encodes a dimeric β-barrel protein implicated in heme degradation
Authors: Wang Jia , Guo Qi , Li Xiaoyi , Wang Xiao , Liu Lin
Published: December 2020

Plant tetrapyrroles, including heme and bilins, are synthesized in plastids. Heme oxygenase (HO) catalyzes the oxidative cleavage of heme to the linear tetrapyrrole biliverdin as the initial step in bilin biosynthesis. Besides the canonical α-helical HO that is conserved from prokaryotes to human, a subfamily of non-canonical dimeric β-barrel HO has been found in bacteria. In this work, we discovered that the Arabidopsis locus AT3G03890 encodes a dimeric β-barrel protein that is structurally related to the putative non-canonical HO and is located in chloroplasts. The recombinant protein was able to bind and degrade heme in a manner different from known HO proteins. Crystal structure of the heme–protein complex reveals that the heme-binding site is in the interdimer interface and the heme iron is co-ordinated by a fixed water molecule. Our results identify a new protein that may function additionally in the tetrapyrrole biosynthetic pathway.
Identification of immune-based prostate cancer subtypes using mRNA expression
Authors: Song Jukun , Wang Wei , Yuan Yiwen , Ban Yong , Su Jiaming , Yuan Dongbo , Chen Weihong , Zhu Jianguo
Published: December 2020

Immune infiltration in Prostate Cancer (PCa) was reported to be strongly associated with clinical outcomes. However, previous research could not elucidate the diversity of different immune cell types that contribute to the functioning of the immune response system. In the present study, the CIBERSORT method was employed to evaluate the relative proportions of immune cell profiling in PCa samples, adjacent tumor samples and normal samples. Three types of molecular classification were identified in tumor samples using the ‘CancerSubtypes’ package of the R software. Each subtype had specific molecular and clinical characteristics. In addition, functional enrichment was analyzed in each subtype. The submap and Tumor Immune Dysfunction and Exclusion (TIDE) algorithms were also used to predict clinical response to the immune checkpoint blockade. Moreover, the Genomics of Drug Sensitivity in Cancer (GDSC) database was employed to screen for potential chemotherapeutic targets for the treatment of PCa. The results showed that Cluster I was associated with advanced PCa and was more likely to respond to immunotherapy. The findings demonstrated that differences in immune responses may be important drivers of PCa progression and response to treatment. Therefore, this comprehensive assessment of the 22 immune cell types in the PCa Tumor Environment (TEM) provides insights on the mechanisms of tumor response to immunotherapy and may help clinicians explore the development of new drugs.
Peer‐to‐peer load allocation using potential field concept for optimal operation of standalone microgrids
Authors: Shoeb Md Asaduzzaman , Shahnia Farhad , Shafiullah G.M.
Published: December 2020

The operation of a standalone microgrid is often optimised by the central controller that decides the set‐points of the local controllers of the distributed generators. However, the optimised set‐points may not remain optimal for a longer period due to the variability of loads and renewable generations. This study proposes a technique for readjusting the dispatch of the suitable generation units, between the optimisations carried out by the central controller, to support load changes. To this end, the potential field concept has been suggested to be adopted by the loads to select the appropriate generation units. The decision is made based on different criteria, such as their cost, reliability, emission, and power loss. This process requires low computational efforts, and thus, can act and make decisions immediately. This is valid as far as the change in the loads is not substantial. For a change above a predetermined level, the microgrid's central controller steps in to optimise the system. The central controller also performs the regular optimisation periodically to retune the whole system and reconfirm the optimal operation. The performance of the proposal has been evaluated by numerical analysis and validates the success and efficacy of the proposal.
Probabilistic power forecast of renewable distributed generation for provision of control reserve using vine copulas
Authors: Möws Stefan , Scheffer Volker , Becker Christian
Published: December 2020

This work focuses on calculating the amount of control reserve, which can be provided by a pool of renewable power plants on the next day. The power forecast of wind and solar power plants depends on the weather forecast, which always contains errors. A merger of individual plants at different locations is advantageous in order to reduce the overall forecast error. Still, the amount of control reserve needs to be determined with a high level of reliability. For the calculation, a probabilistic approach based on historical and current weather data is chosen. In order to model the spatial dependencies of the forecast errors between individual plants, R‐vine copulas are used. In the copula theory, R‐vine copulas provide high accuracy in modelling the dependency of stochastic variables. The methodology is validated and compared to three alternative approaches with a use case of 32 wind and solar plants. The calculated amount of control reserve provided and the achieved reliability proves to be superior to alternative approaches. Additionally, the required reliability level is varied to investigate the impact on the amount of control reserve, which can be offered with the pool.
Proficient operation of grid interfaced solar PV system for power quality improvement during adverse grid conditions
Authors: Shukl Pavitra , Singh Bhim
Published: December 2020

The penetration of solar energy into the distribution network is affected by the seasonal and day‐to‐day variability of the solar power generation. In underdeveloped and developing countries, the power quality (PQ) deterioration issues are primarily observed due to the presence of the weak utility grid. Therefore, smart grid operability is achieved through power exchange along with the improvement in PQ indices by the application of the biquad filter, thereby exhibiting multifunctional control capability. The biquad filter is less affected by quantization errors and involves no additional usage of sensors or control loops, which are the significant advantages observed in its implementation. The biquad filter utilization in this work, includes the estimation of fundamental load current along with mitigation of harmonics, improving PQ, reactive power compensation, and satisfactory performance during voltage unbalance, sag, distortion, swell, and unbalanced loading conditions, which are observed during weak grid conditions. The stochastic inputs of the solar PV array interfaced utility grid system are agitated due to the erratic availability of solar power, and are overcome through an adaptive perturb and observe technique, which uses a variable perturbation step size. Test cases considered here, validate the performance in accordance to the IEEE‐519 standard.
Ideal AVR and PSS: a theoretical study
Authors: Kumar Ajit
Published: December 2020

In this study, a normal form based excitation controller for oscillatory dynamics in power systems is investigated. Afterwards, instead of using a conventional linear control technique for the secondary controller, a novel non‐linear objective for the rotor mode is considered to emulate ideal power system stabiliser (PSS) characteristics. With the aid of eigenvalue analysis, it is shown that the proposed method exhibit ideal PSS characteristics. Moreover, it is demonstrated the proposed technique is robust when compared with the conventional controllers. Time‐domain simulation is performed on the third‐, fourth‐, and sixth‐order model (i.e. IEEE model 1.0, 1.1, and 2.2) of the synchronous machines. Simulation results are shown on a single machine infinite bus power system model.
The nature of VX Sagitarii
Authors: Tabernero H. M. , Dorda R. , Negueruela I. , Marfil E.
Published: December 2020

Aims. We present a spectroscopic analysis of the extremely luminous red star VX Sgr based on high-resolution observations combined with AAVSO light curve data. Given the puzzling characteristics of VX Sgr, we explore three scenarios for its nature: a massive red supergiant (RSG) or red hypergiant (RHG), a Thorne Żytkow object, and an extreme asymptotic giant branch (AGB) star.

Methods. Sampling more than one whole cycle of photometric variability, we derive stellar atmospheric parameters by using state-of-the-art PHOENIX atmospheric models. We compare them to optical and near-infrared spectral types. We report on some key features due to neutral elemental atomic species such as Li I, Ca I, and Rb I.

Results. We provide new insights into its luminosity, its evolutionary stage, and its pulsation period. Based on all the data, there are two strong reasons to believe that VX Sgr is some sort of extreme AGB star. Firstly, it has Mira-like behaviour during active phases. VX Sgr shows light variation with amplitude that is much larger than any known RSG and clearly larger than all RHGs. In addition, it displays Balmer line emission and, as shown here for the first time, line doubling of its metallic spectrum at maximum light, both characteristics typical of Miras. Secondly, unlike any known RSG or RHG, VX Sgr displays strong Rb I lines. In addition to the photospheric lines that are sometimes seen, it always shows circumstellar components whose expansion velocity is compatible with that of the OH masers in the envelope, demonstrating a continuous enrichment of the outer atmosphere with s-process elements, a behaviour that can only be explained by a third dredge-up during the thermal pulse phase.
Formation of IT Competences of Future Mechanical Engineers
Authors: Kurennov Dmitry V. , Ryzhkova Natalia G. , Serdyuk Yury V. , Mayants Maya L. , Timokhova Elena A.
Published: December 2020

Modern trends in the development of manufacturing industries impose new requirements on engineers. Due to the rapidly deepening trends in the digitalization of mechanical engineering, one of the main requirements for the successful professional activity of technical specialists is the possession of tools in the field of information technology. The work highlights the directions of development of mechanical engineering, which define IT-competences of engineers: automation of production and management of product life cycle, use of IT in design and production, growth of demand for “smart” machines. The prospects for the development of it infrastructure in the industry are outlined. On the basis of the analysis, a new content of the discipline “Information technologies in professional activity” of the basic part of engineering training aimed at the formation of popular it competencies is proposed. The main sections of the discipline are: the basics of algorithmization and programming, programming elements in Python, development and integration of software modules in automation systems, the basics of mathematical modeling, the basics of simulation. In the conditions of mass application of information technologies, transition to digital production, the use of the project method is seen as extremely promising in order to obtain a high-quality training result. The discipline provides for the implementation of the project, which includes tasks in a number of sections. Project assignments vary depending on the direction of training and the level of training of students. The structure of the content of the project work is presented in two versions: the work in the CAD-system, including the use of API; the execution of tasks in different sections with a division by level of complexity. It is proposed to divide the time allocated for the study of the discipline between sections on the basis of expert evaluation. Approbation for a number of areas of bachelor’s training in the Department of mechanical engineering. Examples of projects implementation by students are given.
Methodology for the Curriculum Structuring, Formation and Analysis Based on a Quantitative Assessment of Logical Connectivity
Authors: Stroganov Victor Yu. , Tsvetkov Yurii B.
Published: December 2020

The article deals with the curricula structuring through the concept of a module as an indivisible unit of educational content. The concepts of input and output terms are introduced, which form a semantic network of subject area knowledge, as well as the connectivity structure of the education modules of the educational program. The module is presented as some kind of operator for converting input terms into output ones, which allows us to present the curriculum itself as a digraph of the terms connectedness. An approach to the quantitative assessment of the teaching materials coherence in the curriculum is given. Ultimately, the curriculum itself is formally presented as a network planning model, where the learner’s potential abilities are the resources.
Educational Laboratory Complex for the Study of Complicated Systems
Authors: Suyatinov Sergey I.
Published: December 2020

Laboratory practice is an important part of the educational process in a technical university. It helps to develop the skills of independent work of a future engineer and to consolidate theoretical knowledge. Due to a change-over to the digital economy, the introduction of complex production systems and their digital twins, the organization of laboratory work corresponding to the current state of the art gets more complicated. The article presents a biotechnological educational research complex for laboratory practice of the future specialists in the field of managing complex organizational and technical systems. Main feature of the complex is that the student performs two functions at the same time. He is both a researcher and an object of study, representing a complex system. The initial information in the process of laboratory work is the biosignals registered by mini sensors. The main purpose is to identify and evaluate the functional state of a person as a complex system. Various methods and algorithms for processing time series are used. Being an effective form of active learning, this approach motivates the student not only to acquire knowledge, but also to actively search for it. We give an example of using the complex to create a digital twin.
Forming Computational Thinking and Computer Modeling Project Activities in the Physics Course of the Technical University
Authors: Baranov Alexander V.
Published: December 2020

The article discusses contextual technology of teaching and learning physics of IT students at the Technical University. The main goal of this research is development and analysis contextual technology to maintain and increase IT students’ interest in physics with parallel formation of computational thinking and competencies in computer science applications. This technology takes place in several contexts: the scientific method and modeling of physical processes, computational thinking and professional competence. The all contexts are present in four stages of the training cycle: lectures, seminars, lab works, and computer modeling of physical processes. As an example we demonstrate using the contextual technology for the physics course topic “Dynamics of a rigid body rotational motion” in all four stages of the training cycle. The example of student’s team development of the virtual lab work “Precession and nutation of a gyroscope” is given. According to the Novosibirsk State Technical University professors and students, the author’s technology has demonstrated its effectiveness in the formation of professional thinking and competencies of the IT students in teaching physics at the Technical University.
Complex Analysis Electronic Course in Nomotex DLS
Authors: Dimitrienko Yury I. , Algazin Oleg D. , Skudneva Oksana V. , Ozhgibisova Julia V. , Alesina Raisa K. , Alesin Alexander V.
Published: December 2020

Information about the electronic course “Complex Analysis” created in the Digital Learning System NOMOTEX is presented. The analysis of the results of experimental teaching of students of the Bauman Moscow State Technical University on this course.
Development of the Laboratory Work: “Modeling of a Mobile Robot on Mecanum Wheels Kinematics”
Authors: Alhanov Daniil S. , Rubtsov Vasily I.
Published: December 2020

The basis of any mobile robot is the chassis of a structure. The chassis is a set of parts that provide the mechanical energy transfer from the engines to the engine active elements, combined with the drives in a functional structural subsystem. The chassis and the applied propulsion determine both the mobile robot design appearance and its functional capabilities, the main of which is the ability to move in given conditions. Omnicycle movement is used in modern robotics to get additional maneuverability of the device in combination with increasing the efficiency of using a limited level of energy. Such systems allow for omnidirectional movement by applying an individual torque to the drive of each wheel. The main advantage of the kinematics of such robots is the fact that the complex movement of the entire system can easily be divided into simple rotational and translational movements. This article discusses the design features and the mecanum wheel kinematics. We solve direct and inverse kinematics problems for a four-wheeled mobile robot with this type of propellers on a flat surface. Based on the got dependencies, we built a mathematical model in the Matlab Simulink environment using an additional Mobile Robotics Simulation Toolbox package. Using the obtained model, we developed the simplest trajectory elements and synthesized algorithms for managing the mobile platform. Also, we analyzed the results got during a series of computer tests.
A Digital Device for Automatic Checking of Homework Assignments in the Digital Circuits Course
Authors: Gavrilenkov Sergey I. , Petrenko Elizaveta O. , Arbuzov Evgeny V.
Published: December 2020

This paper considers a digital device for automatic checking of homework assignments in the digital circuits course. The assignment is to make a digital circuit corresponding to a given logical expression; the circuit is comprised of elementary logic gates. The process of manual testing the built circuit is very labor-intensive because checking a circuit with N inputs variables requires checking the correctness of the output variable for 2N cases. We propose automating this pro-cess with a special digital device. The device is comprised of a microcontroller connected to the circuit tested. The microcontroller is connected to a personal computer with an application written in C# for executing the main operations of the testing process. During testing, the student chooses from a database or enters the logical expression corresponding to the circuit tested. For the expression, the software generates truth tables where actual and required responses of the circuit are given. Actual circuit responses are acquired by probing the circuit via the microcontroller, and the expected values are calculated from the logical expression. The truth tables are then presented to the student with a message of whether the circuit works correctly or not. The device was integrated into the process of checking homework assignments in the digital electronics course, and it significantly sped up the process of checking homework assignment circuits, resulting in better education quality.
A Framework for Optimal Placement of Strain Gauges on Elastic Elements of Force Sensors Using Genetic Algorithms
Authors: Gavrilenkov Sergey I.
Published: December 2020

This paper presents a digital education tool for learning the specifics and behavior of a multi-objective genetic algorithm (MOGA) used to solve the problem of optimal placement of strain gauges on the elastic element of a force sensor. The paper formulates the problem statement and specifies how this problem can be solved using the MOGA. For the problem, the design variables are the locations of strain gauges and angles at which they are positioned. The goal functions are the output signal of the sensor and the measurement error from bending moments, which can be caused by the off-centric application of load. The solution algorithm is implemented within a framework that can be used to investigate and learn how parameters of MOGA influence its performance. The framework is used to run computational experiments for the given problem to find the optimal placement of strain gauges on the elastic element of a given force sensor. The performance of the MOGA in solving this problem is compared to that of the traditional approach.
Technology of Manufacturing of Disk Blanks to High-Speed Elements for Tests on Anti-Meteoroid Protection
Authors: Kruglov Pavel V. , Bolotina Irina A.
Published: December 2020

In this paper, a variant of the manufacturing technology of the disk blank for the segment liner of the shape charge is proposed. The charges are used to test the anti-meteorite stability of spacecraft. The proposed method makes it possible to form a blank in which, as its thickness decreases from the center to the periphery, a periodic profile variable in thickness is formed simultaneously in the circumferential direction. The disk metal blank is fixed in a three-cam chuck and the end face of the disk is cut with a decrease in thickness along the generatrix from the center to the periphery. Under the action of fastening forces, the disk blank is deformed and after processing the thickness in the cross section has a triangular periodic profile. Experiments on processing of disk preparations at various efforts of machine device are carried out. The dependences of the disc thickness on the fastening force in the device are obtained. After harmonic analysis of the thickness of the cross section, the values of the amplitudes of harmonics of different thickness in the circumferential direction at different distances from the center of the disk blank were determined. An increase in the fastening force leads to an increase in the amplitude of the third harmonic of the part thickness. It is shown that the change in the amplitudes of the first and second harmonics of different thickness is insignificant, and the amplitude of the third harmonic increases from the center to the periphery, which is caused by a decrease in the stiffness of the workpiece in the peripheral region.
Computer Simulation of a Group of Mobile Robots in Special Software Tools
Authors: Raskatov Vadim D. , Rubtsov Vasily I.
Published: December 2020

The problem of controlling a group of special robots for application in the high-risk conditions (for example, for fire extinguishing, search for hazardous substances, or elimination of consequences of emergencies) is solved. According to the task, robots operate in the industrial and urban environment, i.e., the movement of robots is planar. Various strategies of group interaction between robots are analyzed; a literature review is conducted. Due to the task specifics, a decentralized management strategy has been selected. For solving the problem, a movement algorithm of a group of mobile robots with a subsequent visual check of the resulting algorithm operation is proposed. Implementation of the algorithm’s work is performed in the MATLAB environment. For preliminary algorithm verification and modeling of various dangerous cases, a model of robot group using the Mobile Robotics Simulation Toolbox of MATLAB was made. For a more detailed and accurate analysis of the real robot’s behavior, a model in the ROS package has been developed. That model interacts with the developed algorithm through the ROS Toolbox package of MATLAB. This software can be used for the training of engineering staff in the field of mathematical modeling, group control, and multi-agent systems. As a result of verification, the program and the model successfully solve the task. Yet, the model in the ROS package requires greater computational power because of the large number of complex calculations.
Innovative Educational Technology for the Use of Modern CAD Systems for the Formation of Professional Competences of Students of Radio Engineering Specialties
Authors: Suchkov Victor B. , Likhoedenko Andrei K. , Seregin Grigory M. , Karakulin Yury V.
Published: December 2020

The basic principles of application of innovative educational technology on the basis of modern systems of automated design for higher educational institutions for students of radio engineering specialties are considered. Methods of forming competences in students for independent use of automated design systems in simulation of complex elements of autonomous information and control systems are shown. Features of modern CAD systems such as PTC Creo Parametric and Altair FEKO are described for their opportunities in teaching process in technical university. The results of simulation and calculations obtained by students during their individual tasks are given. 3D-models of microwave devices developed by students are discussed for formation of competences in electromagnetic simulation by numerical methods in special CAD systems. Especially, aspects of relationship between capabilities of students to create 3D-models and to calculate current distribution in microwave systems are discussed.