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Synthesis and Structure of Binary Copper/Silver-Arsenic Clusters Derived from Zintl Ion As_(7)^(3-)

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Chinese Journal of Chemistry 2022年第1期40卷 65-70页

作者： Wei-Qiang Zhang Nikolay V.tkachenko Lei Qiao Alexander I.Boldyrev Zhong-Ming Sun State Key Laboratory of Elemento-Organic Chemistry Tianjin Key Lab for Rare Earth Materials and ApplicationsSchool of Materials Science and EngineeringNankai UniversityTianjin 300350China Department of Chemistry and Biochemistry Utah State University 0300 Old Main HillLoganUT 84322-0300USA

Polyarsenides containing coinage metals,[As_(7)Cu(PPh_(3))]^(2-)(1)and[M_(2)As_(14)]^(4-)(M=Cu,2;Ag,3),were synthesized by reactions of the nominal composition K_(3)As_(7) with Group 11 metal *** possible intermediate,cluster 1,was isolated from the solution phase through subtle changes in reaction conditions in the formation process of complex ***,we establish the pathway of the bimetallic bridged clusters[Cu_(2)As_(14)]^(4-)by the oxidation of the[As_(7)Cu(PPh_(3))]^(2-).Quantum chemical calculations reveal the presence of metallophilic interaction in clusters 2 and 3.

关键词： Polyarsenide cluster Reaction mechanism Zintl ions Covalently bound Metallophilic interaction

Ruthenium-mediated assembly and enhanced stability of heterometallic polystannides[Ru_(2)Sn_(19)]^(4−)and[Ru_(2)Sn_(20)]^(6−)

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Nano Research 2022年第6期15卷 5705-5711页

作者： Wei-Xing Chen Nikolay V.tkachenko Alvaro Muñoz-Castro Alexander I.Boldyrev Zhong-Ming Sun State Key Laboratory of Elemento-Organic Chemistry Tianjin Key Lab of Rare Earth Materials and ApplicationsSchool of Materials Science and EngineeringNankai UniversityTianjin 300350China Department of Chemistry and Biochemistry Utah State University0300 Old Main HillLoganUT 84322-0300USA Grupo de Química Inorgánicay Materiales Moleculares Facultad de IngenieriaUniversidad Autonoma de ChileEl Llano SubercaseauxSantiago 2801Chile

In this work,we report the synthesis and characterization of two novel Ru-containing Zintl clusters:[Sn_(19){Ru(COD)(en)}_(2)]^(4−)and[Sn_(20){Ru(COD)}_(2)]^(6−).The synthesized compounds not only expand the family of Ru-Sn cluster systems but also shed light on the structure of heterometallic complexes in a previously unknown range of tin *** single-crystal X-ray diffraction(XRD)analysis reveals the dimeric nature of the *** different assembly patterns of the formal[Sn(η^(3)-Sn_(9))]monomer were observed:the dimerization through the vertex fusion process and the direct dimerization through the formation of 2c–2e Sn–Snσ*** both clusters,the density functional theory calculations reveal the locallyσ-aromatic nature of the[Sn(η^(3)-Sn_(9))]monomer resulting in two independent magnetic shielding *** believe that our findings will help the community to further explore the fascinating chemistry of polystannide clusters.

关键词： heterometallic clusters aromaticity polystannide ruthenium Zintl anion

Routine laboratory parameters in patients with necrotizing pancreatitis by the time of operative pancreatic debridement:Food for thought

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World Journal of Gastrointestinal Surgery 2022年第1期14卷 64-77页

作者： Yaroslav M Susak Kristina Opalchuk Olexandr tkachenko Mariia Rudyk Larysa Skivka Department of Surgery with the Course of Emergency and Vascular Surgery O.O.Bogomolet’s National Medical UniversityKyiv 01601Ukraine Department of Surgery Anesthesiology and Intensive Care Postgraduate EducationO.O.Bogomolet’s National Medical UniversityKyiv 01601Ukraine Department of Surgery N2 Kyiv City Clinical Emergency HospitalKyiv City Clinical Emergency HospitalKyiv 02000Ukraine Department of Microbiology and Immunology Educational and Scientific Center“Institute of Biology and Medicine”Taras Shevchenko National University of KyivKyiv 01033Ukraine

BACKGROUND Timing of invasive intervention such as operative pancreatic debridement(OPD)in patients with acute necrotizing pancreatitis(ANP)is linked to the degree of encapsulation in necrotic collections and controlled *** markers of these processes might assist decision-making on the timing of surgical *** our opinion,it is logical to search for such markers among routine laboratory parameters traditionally used in ANP patients,considering simplicity and cost-efficacy of routine laboratory *** To evaluate laboratory variables in ANP patients in the preoperative period for the purpose of their use in the timing of *** A retrospective analysis of routine laboratory parameters in 53 ANP patients undergoing OPD between 2017 and 2020 was *** changes of routine hematological and biochemical indices were examined in the preoperative *** were divided into survivors and *** were divided into subgroups with short and long post-surgery length of stay(LOS)in *** analysis was used to evaluate association of laboratory variables with *** regression was used to assess risk factors for patient *** Seven patients(15%)with severe acute pancreatitis(SAP)and 46 patients(85%)with moderately SAP(MSAP)were included in the *** age of participants was 43.2 years;33(62.3%)were *** etiology included biliary(15%),alcohol(80%),and idiopathic/other(5%).Median time from diagnosis to OPD was≥4 *** postoperative LOS was at the average of 53 *** was 19%.Progressive increase of platelet count in preoperative period was associated with shortened *** aspartate aminotransferase and direct bilirubin(DB)levels the day before the OPD along with weak progressive decrease of DB in preoperative period were reliable predictors for ANP patient *** Multifactorial analysis of dynamic changes of routine labo

关键词： Acute necrotizing pancreatitis Operative pancreatic debridement timing Dynamic changes of laboratory variables Preoperative period Necrotic tissue encapsulation Hospital length of stay

Astrophysical S-factor and reaction rate for 15N(p,γ)16O within the modified potential cluster model

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Chinese Physics C 2024年第4期48卷 130-145页

作者： S.B.Dubovichenko A.S.tkachenko R.Ya.Kezerashvili N.A.Burkova B.M.Yeleusheva Fesenkov Astrophysical Institute 050020 AlmatyKazakhstan New York City College of Technology City University of New YorkBrooklyn11201 New YorkUSA Graduate School and University Center City University of New York10016 New YorkUSA al-Farabi Kazakh National University 050040 AlmatyKazakhstan

We study radiative p^(15)N capture on the ground state of ^(16)O at stellar energies within the framework of a modified potential cluster model(MPCM)with forbidden states,including low-lying *** investigation of the ^(15)N(p,γ0)^(16)O reaction includes the consideration of ^(3)S_(1) resonances due to E1 transitions and the contribution of the ^(3)P_(1) scattering wave in the p+^(15)N channel due to the ^(3)P_(1)→^(3)P_(0)M1 *** calculated the astrophysical low-energy S-factor,and the extrapolated S(0)turned out to be within 34.7−40.4 keV·*** important role of the asymptotic constant(AC)for the ^(15)N(p,γ0)16O process with interfering ^(3)S_(1)(312)and ^(3)S_(1)(962)resonances is elucidated.A comparison of our calculation for the S-factor with existing experimental and theoretical data is addressed,and a reasonable agreement is *** reaction rate is calculated and compared with the existing *** has negligible dependence on the variation of AC but shows a strong impact of the interference of ^(3)S_(1)(312)and ^(3)S_(1)(962)resonances in reference to the CNO Gamow windows,especially at low *** estimate the contribution of cascade transitions to the reaction rate based on the exclusive experimental data from ***.C.85,065810(2012).The reaction rate enhancement due to the cascade transitions is observed from T_(9)>0.3 and reaches the maximum factor~1.3 at T_(9)=*** present the Gamow energy window and a comparison of rates for radiative proton capture reactions ^(12)N(p,γ)^(13)O,^(13)N(p,γ)^(14)O,^(14)N(p,γ)^(15)O,and ^(15)N(p,γ)^(16)O obtained in the framework of the MPCM and provide the temperature windows,prevalence,and significance of each process.

关键词： low and astrophysical energies p^(15)N system thermonuclear reaction rate potential cluster model CNO-cycle

Interpenetrated Magnesium-Tricalcium Phosphate Composite:Manufacture,Characterization and In Vitro Degradation Test

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Acta Metallurgica Sinica(English Letters) 2017年第4期30卷 319-325页

作者： Mariano Casas-Luna Serhii tkachenko Miroslava Horynova Lenka Klakurkova Pavel Gejdos Sebastian Diaz-de-la-Torre Ladislav Celko Jozef Kaiser Edgar B. Montufar CEITEC-Central European Institute of Technology Brno University of TechnologyPurkyfnova 656/123612 00 BmoCzech Republic CIITEC-Centro de Investigacion e Innovacion Tecnologica Instituto Politocnico NacionalCerrada de CECATI02250 Mexico CityMexico

Magnesium and calcium phosphates composites are promising biomaterials to create biodegradable load-bearing implants for bone regeneration. The present investigation is focused on the design of an interpenetrated magnesium- tricalcium phosphate （Mg-TCP） composite and its evaluation under immersion test. In the study, TCP porous preforms were fabricated by robocasting to have a prefect control of porosity and pore size and later infiltrated with pure commercial Mg through current-assisted metal infiltration （CAMI） technique. The microstructure, composition, distribution of phases and degradation of the composite under physiological simulated conditions were analysed by scanning electron microscopy, elemental chemical analysis and X-ray diffraction. The results revealed that robocast TCP preforms were full infiltrated by magnesium through CAMI, even small pores below 2 μm have been filled with Mg, giving to the composite a good interpenetration. The degradation rate of the Mg-TCP composite displays lower value compared to the one of pure Mg during the first 24 h of immersion test.

关键词： Calcium phosphate Magnesium Liquid metal infiltration Spark plasma sintering Corrosion

New measurements and phase shift analysis of p^16O elastic scattering at astrophysical energies

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Chinese Physics C 2017年第1期41卷 77-86页

作者： Sergey Dubovichenko Nassurlla Burtebayev Albert Dzhazairov-Kakhramanov Denis Zazulin Zhambul Kerimkulov Marzhan Nassurlla Chingis Omarov Alesya tkachenko Tatyana Shmygaleva Stanislaw Kliczewski Turlan Sadykov Fesenkov Astrophysical Institute "NCSRT"ASC MID Republic of Kazakhstan Institute of Nuclear Physics ME RK Almaty Republic of Kazakhstan Kazakh National University al-Farabi Almaty Republic of Kazakhstan H. Niewodniczanski Institute of Nuclear Physics Polish Academy of Sciences Cracow Poland Institute of Physics and Technology Almaty Republic of Kazakhstan

The results of new experimental measurements of p^16O elastic scattering in the energy range of 0.6–1.0MeV at angles of 40°–160° are given. Phase shift analysis of p^（16）O elastic scattering was made using these and other experimental data on differential cross sections in excitation functions and angular distributions at energies of up to 2.5 Me V.

关键词： astrophysical energies phase shift analysis angular distributions cluster model.

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量子计算中的三元逻辑

量子计算中的三元逻辑

作者： tkachenko Anton 北京化工大学

学位级别：硕士

计算机技术发展到现阶段,需要更强的功能和更高的集成性。然而,根据经典理论设计的计算机已经快到了极限,这个极限起源于经典计算机所基于的经典物理学,这制约着计算机计算能力的进一步提高。因此,解决这个问题的方法在于从根本上改变... 详细信息

计算机技术发展到现阶段,需要更强的功能和更高的集成性。然而,根据经典理论设计的计算机已经快到了极限,这个极限起源于经典计算机所基于的经典物理学,这制约着计算机计算能力的进一步提高。因此,解决这个问题的方法在于从根本上改变其物理结构。为了解决这个问题,可以使用量子计算机。量子计算机是利用量子力学特有的现象和效应,例如叠加原理和纠缠性来对数据进行操作的一种装置。从理论上讲,量子计算机的计算能力比起他的前辈----基于经典理论的经典计算机,功能强大的多。现在关于量子计算机的研究,主要集中在以qubit(量子比特)为对象的二元逻辑。但是基于qubit的二元逻辑存在一些局限性,例如很难实现概率计算。事实上,存在着不用附加额外算法的允许实现概率计算的逻辑,这就是多值逻辑。其中的一个特例就是本文主要研究的对象,三值逻辑。在三值逻辑中,因为其逻辑单元中存在着未知分量,使得其更适用于描述概率过程。本文研究显示,三值逻辑可以作为信息的最小单元,采用三值逻辑可以有效地提升量子计算机的能力。本文的主要内容如下:1)考虑到三元逻辑是量子计算机中的基本信息单元,我们将一对具有三能级结构处于纠缠态的离子作为三态粒子(qutrit),建立了三态粒子的数学和物理模型。这使我们可以精确描述三态粒子的物理特性,能够描述三态粒子的主要物理参数,例如:相位和正算子取值测度(POVM)。2)为了描述在量子计算机上实现概率计算的方法,我们以GHZ态作为特例,研究了量子计算机上的概率计算的实现。其与通常纠缠态不同,主要区别在于GHZ态的测量结果在三个粒子纠缠中是不对称的,是以三个纠缠态的颗粒组成。基于这种效果,我们的研究显示,量子计算机解决了旧传统性质计算机的概率问题,量子计算机中概率计算的硬件具有经典的本质。

关键词：量子计算概率计算 Greenberger-Horne-Zeilinger态多级量子相互作用量子位三态粒子

Modeling of ultrafast X-ray induced magnetization dynamics in magnetic multilayer systems

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npj Computational Materials 2022年第1期8卷 2044-2052页

作者： K.J.Kapcia V.tkachenko F.Capotondi A.Lichtenstein S.Molodtsov L.Müller A.Philippi-Kobs P.Piekarz B.Ziaja Center for Free-Electron Laser Science CFEL Deutsches Elektronen-Synchrotron DESYNotkestr.8522607HamburgGermany Institute of Spintronics and Quantum Information Faculty of PhysicsAdam Mickiewicz University in PoznańPoznańPoland Institute of Nuclear Physics Polish Academy of SciencesKrakówPoland European XFEL GmbH SchenefeldGermany Elettra-Sincrotrone Trieste S.C.p.A TriesteBasovizzaItaly University of Hamburg HamburgGermany Deutsches Elektronen-Synchrotron DESY Notkestr.8522607HamburgGermany

In this work,we report on modeling results obtained with our recently developed simulation tool enabling nanoscopic description of electronic processes in X-ray irradiated ferromagnetic *** this tool,we have studied the response of Co/Pt multilayer system irradiated by an ultrafast extreme ultraviolet pulse at the M-edge of Co(photon energy~60 eV).It was previously investigated experimentally at the FERMI free-electron-laser facility,using the magnetic small-angle X-ray scattering *** simulations show that the magnetic scattering signal from cobalt decreases on femtosecond timescales due to electronic excitation,relaxation,and transport processes both in the cobalt and in the platinum layers,following the trend observed in the experimental *** confirmation of the predominant role of electronic processes for X-ray induced demagnetization in the regime below the structural damage threshold is a step toward quantitative control and manipulation of X-ray induced magnetic processes on femtosecond timescales.

关键词： magnetization multilayer cobalt

Substituted diamides of dipicolinic acid as extractants and ionophores for rare earth metals

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Journal of Rare Earths 2023年第8期41卷 1234-1241,I0005页

作者： Yingchao Ren Valery A.Polukeev Ekaterina V.Kenf Liudmila I.tkachenko Mikhail Yu Alyapyshev Vasily A.Babain Andrey V.Nechaev Andrey V.Legin Dmitry O.Kirsanov Institute of Chemistry Saint-Petersburg UniversityPeterhofUniversitetsky Prospect 26198504Saint-PetersburgRussia JSVC Vekton Ul.2-oy Luch 9192019Saint-PetersburgRussia Khlopin Radium Institute 194021282nd Murinsky avRussia ThreeArc Mining LLC Pr.Narodnogo Opolchenia 10198216Saint-PetersburgRussia Rusredmet Vosstanovleniya str.15bl.3198320St.PeterburgKrasnoe seloRussia

The variety of newly synthesized diamides of dipicolinic acid(DPA)bearing methyl-and oxymethyl substituents in various positions of phenyl ring was investigated as potential ligands for liquid-liquid extraction of rare earth metal ions and as membrane active compounds in plasticized polymeric membranes of potentiometric *** is found that scandium is extracted with 2,6-pyridinedicarboxylic acid diamides similarly to heavy lanthanides,while yttrium is extracted together with light group *** shows high selectivity for the separation of cadmium/zinc,lead/nickel or copper/nickel *** four out of six studied ligands demonstrate significant potentiometric sensitivity towards scandium,yttrium and lanthanides in 10^(-7)-10^(-3)mol/L concentration range in nitric acid *** trends in sensitivity values vary depending on a ligand structure and the highest values are observed for Sc^(3+)and heavy *** to the evaluated selectivity Sm^(3+)is the most preferred ion,while La^(3+)is the most *** differences in sensor behavior in rare earth metal solutions assume that such devices can be applied in sensor arrays for potentiometric analysis of lanthanide mixtures.

关键词： Dipicolini cacid diamides Scandium Yttrium Lanthanides Extraction Potentiometric sensors