Nite Research Articles

Ultrahigh-nickel layered cathode with cycling stability for sustainable lithium-ion batteries

Nickel-rich layered transition metal oxides are leading cathode candidates for lithium-ion batteries due to their increased capacity, low cost and enhanced environmental sustainability compared to cobalt formulations. However, the nickel enrichment comes with larger volume change during cycling as well as reduced oxygen stability, which can both incur performance degradation. Here we show an ultrahigh-nickel cathode, LiNi0.94Co0.05Te0.01O2, that addresses all of these critical issues by introducing high valent tellurium cations (Te6+). The as-prepared material exhibits an initial capacity of up to 239 milliampere-hours (mAh) per gram and an impressive capacity retention of 94.5% after 200 cycles. The resulting Ah-level lithium metal battery with silicon-carbon anode achieves an extraordinary monomer energy density of 404 watt-hours (Wh) per kilogram with retention of 91.2% after 300 cycles. Advanced characterizations and theoretical calculations show that the introduction of tellurium serves to engineer the particle morphology for a microstructure to better accommodate the lattice strain and enable an intralayer Te–Ni–Ni–Te ordered superstructure, which effectively tunes the ligand energy-level structure and suppresses lattice oxygen loss. This work not only advances the energy density of nickel-based lithium-ion batteries into the realm of 400 Wh kg−1 but suggests new opportunities in structure design for cathode materials without trade-off between performance and sustainability.

A computational investigation into the electron-transfer kinetics and thermodynamics of hydrogen gas production by Ni(S2C2H2)2, Ni(Se2C2H2)2, and Ni(Te2C2H2) complexes

Fossil fuels are rapidly being depleted and releasing great amounts of greenhouse gases, causing harmful effects to the environment. Renewable energy such as solar energy is an alternative option instead of using fossil fuels. However, storing the energy harvested as H2 by the electrolysis of H2O requires an effective, cheap catalyst to be practical. Thus, Ni catalysts are a valid option to produce hydrogen gas. In this study, the thermodynamics, and kinetics of ET for the electrocatalytic production of H2 by analogous Ni-bis(dithiolene), Ni-bis(diselenolene), and Ni-bis(ditellurolene) complexes were studied using DFT. Thermodynamically, it was found that all three catalysts catalyze the formation of H2 with similar energetic cost. However, for release of H2 the catalysts must be doubly protonated and triply reduced. While the first two reductions occur with low Gibbs activation energies the third reduction does not. Therefore, if a third reduction is required for electrocatalytic H2 production a large overpotential would be expected from our predictions.

¡Ni te me acerques! (Stay Away!) Negotiating Physical Distancing in Hispanophone Corona Fictions

In March 2020, more than 100 governments around the world imposed partial or full lockdown policies prohibiting people to leave their homes except for activities deemed essential (e.g. procuring food, going to work) to reduce SARS-CoV-2 transmissions. Furthermore, authorities, media and peers encouraged people to adopt physical distancing behaviors, requesting not to touch each other and even keep a distance of at least one to two meters from one another.
 Cultural and literary productions—so-called Corona Fictions—represent and process the multitude of ways the population perceived and coped with the lockdown situation during the pandemic and its diverse effects. While literary texts written during confinement and published in anthologies focus on emotional states enhanced by the psychological impact of the lockdown, the narratives in films such as Norberto Ramos del Val’s ¡Ni te me acerques! (2020) focus on negotiating the process of physical distancing itself.
 This contribution will, thus, look at the representations of physical distancing in written and audiovisual productions from the first lockdown and analyze the similarities therein. From a cultural studies point of view, we are particularly interested in the ways these Corona Fictions negotiate physical distancing, isolation and self-reflection in their narratives of the respective medium.

Geology, mineralogy and pyrite trace elements constraints on gold mineralization mechanism at the giant Dayingezhuang gold deposit, Jiaodong Peninsula, China

Identifying the mechanism of gold deposition is important to reveal ore-forming processes and genesis. The giant Dayingezhuang gold deposit, with 283 tons of proven gold resources, is located in the northwestern of the Jiaodong gold province, China. Pyrite is the dominant sulfide minerals and visible gold dominates Au resources. Five types of pyrite were identified at the Dayingezhuang gold deposit: (1) Py-1a is euhedral grain with Co– and Ni-rich content; (2) Py-1b is subhedral to anhedral grain with intermediate rich in Co, Ni, As and minor Te; (3) Py-2a is rich in As and crystalizes with a mass of mineral inclusions; (4) Py-2b is also rich in As but glossy; and (5) Py-3 is mainly euhedral grain and crystalizes with much more galena.Laser ablation spectra commonly shows Au and Ag-Bi-Pb spikes in Py-1b, Py-2a, Py-2b and Py-3, reflecting the occurrence of nanoparticles in pyrite. LA-ICP-MS mapping analysis shows elemental zoning of Co, Ni and As, which is considered as the element depletion (Co and Ni) of pre-existing Py-1a and enrichment (As) from ore-forming fluid via coupled dissolution-reprecipitation (CDR) mechanism. Au in pyrite is totally below 1 ppm (average 0.154 ppm and median 0.264 ppm) and without arresting variation in different pyrites, and mass balance indecates that invisible gold mobilized from pyrite may not interpret the formation of world-class gold deposit in the Jiaodong gold province. Most of the gold grains distribute in the microfractures of pyrites which is caused by brittle deformation. Fracture of rocks and minerals significantly improve the efficiency of water–rock interaction and result in sudden drop of fluid pressure. A probable model is that a fluid with extremely different physicochemical conditions and high As-Au-Cu-Pb-Bi-Te content give rise to Au mineralization, and visible gold precipitate in a gold-supersaturated hydrothermal fluid which is attributed to sulfidation and fluid phase separation via hydrofracturing. In addition, similar occurrences of gold and silver (individual minerals in microfractures of pyrites and spikes on laser ablation spectra of pyrite) and paragenetic sequence indicate that gold and silver mineralization belong to single geological event.

Pregnant Violence in Post-3.11 Fiction

This essay explores the violence and the threat of violence associated with pregnancy in Japanese fiction after the triple disasters—the earthquake, tsunami, and nuclear meltdown—of March 11, 2011. There is hardly a female character in this fiction that is not confronted with questions about pregnancy and childbirth. The queries are surely motivated by genuine concern about the humans involved, but they are just as often about control, about a woman’s body as a public item, about responsibility to the child, and then to society at large. Childbearing in a disaster zone is profoundly anxiety-producing; but it is also worth examining how quickly childbirth, and then women’s bodies, become at times metaphor and at times synecdoche, for the trauma and fears of the entire society, in these works. In this article I consider Sono Shion’s Kibō no kuni, Kanehara Hitomi’s Motazaru mono, Taguchi Randi’s Zōn ni te, Kimura Yūsuke’s Seichi Cs, and Furukawa Hideo’s Uma tachi yo, sore demo muku de.

Representaciones sociales de los estudiantes universitarios en Gestión Cultural sobre los avances de la disciplina en el sureste de México

espanolLa profesionalizacion de la Gestion Cultural en Mexico ha avanzado en las ultimas dos decadas y se ha logrado debido al interes de las instituciones universitarias tanto publicas como privadas. En el sureste de Mexico, la universidad publica de Tabasco fue una de las pioneras en el pais en la oferta de la licenciatura en Desarrollo Cultural en el 2007, la cual se reestructuro en 2017 con el nombre de Gestion y Promocion de la Cultura. De ahi se deriva este estudio el cual tiene como actores sociales a los estudiantes que conforman las primeras generaciones de esta nueva oferta universitaria en modalidad presencial escolarizada. En este articulo se identifi can las representaciones sociales de los estudiantes respecto a su disciplina, las cuales tienen como nucleo central, la preocupacion por el distanciamiento de la sociedad con la cultura, lo cual, dicen, repercutira en su insercion al campo laboral EnglishThis research aims to identify the social representations of students in Management and Promotion of Culture at a public university in Tabasco at southeastern Mexico. It was analyzed using the theory of social representations. The methodology used was quantitative using the survey as the data collection technique. Regarding the social actors under study, we worked with the fi nite population, through the non-probabilistic technique. The social representations of the students of the fi rst generations of said degree have as a central nucleus, the concern for the current distancing of society with culture, so they consider that their professional duty is to create a link through projects of Intervention projects that manage to change these perceptions of the people of their entity, which is a challenge they acquire as students of cultural management, and very soon as graduates. The limitations of the research are derived in terms of the number of population with which it was worked, which was the one belonging to a public university, remaining outside those dependent on government institutions that are focused on artistic creation. The lines through which this research work can be extended is the follow-up of the fi rst generations of graduates and their insertion into the labor fi eld

Pharmacological Approach for the Prevention of Postoperative Shivering: A Systematic Review of Prospective Randomized Controlled Trials

Shivering is a common postoperative complication that occurs after both general and regional anesthesia even in the cases when hypothermia during surgery has been averted. Patients describe it as a highly unpleasant experience, while clinicians are concerned due to its adverse effects such as increased oxygen consumption. In this article, we present a summary of the pathophysiological mechanisms involved in postoperative shivering (POS), risk factors, and inadvertent effects. The major objective of this article was to review the existing literature on the effi ciency of various drug interventions as a prophylactic measure against POS. Since α2-adrenergic, opioid, anticholinergic, and serotonergic pathways are thought to play a role in the pathogenesis of POS, a wide variety of drugs has been investigated in this regard. Although the methodological diversity of the study designs and regimens does not support drawing defi nite conclusions, there is evidence indicating a benefi cial effect of dexmedetomidine, ketamine, tramadol, meperidine, dexamethasone, nefopam, granisetron, and ondansetron in the prevention of POS. The purpose of this review is to provide a thorough insight on various drug options and to serve as an aid for clinicians for careful analysis of the advantages and disadvantages of each regimen to decide which regimen will be ideally suited for the medical profi le of each patient.

Thermodynamic assessment of the Fe–Ni–Te system

For the purpose of modeling internal corrosion of the stainless steel fuel pins in fast nuclear reactors, the present work presents a thermodynamic description of the Fe–Ni–Te system modeled via the Calphad method. The liquid phase was modeled using the ionic 2-sublattice liquid model. Only binary parameters were optimized in the β2, δ and τ solid phases, to fit the isothermal section at 600 °C. The liquid did not require much adjustment from the extrapolation from the binary Fe–Te, Ni–Te and Fe–Ni systems. The paper presents a re-optimization of the Fe–Te liquid description in order to remove inverted liquid miscibility gaps at high temperatures. The resulting phase diagrams reproduce experimental isothermal sections well, and fits liquidus and solidus data very well. The description will be incorporated into the Thermodynamics of Advanced Fuels - International Database (TAF-ID). This will then be coupled with the Germinal system code to model the fission-product induced corrosion in nuclear fuel pins.

Characteristic Study of Combined eects of MHD and Coriolis Force on Free Convection in a Rectangular Cavity with Isotropic and Anisotropic Porous Media

This investigation deals with the classic Rayleigh - Benard problem for a laminar, viscous, unsteady incompressible fluid flow heated from below is extended to three-dimensional convection in a nite geometry with isotropic and anisotropic porous media rotating with constant angular velocity and the magnetic eld is applied in the vertical direction. For the given physical set-up, governing partial differential equations are transformed to a set of non-dimensional ordinary differential equations using similarity transformation. This demands to apply Fourier series method to study the characteristic of velocity, temperature and concentration for the effect of Taylors number, Rayleigh number, Hartmanns number and Prandtl number for both anisotropic and isotropic porous media. The results of steam function and isotherms on various parameters have been discussed and found to be good agreement for the physical system.

Синтез графт-сополимеров натриевой соли карбоксиметилцеллюлозы с N-винилимидазолом и исследование свойств их водных дисперсий

Радикальной полимеризацией в присутствии пероксида водорода получены графт-сополимеры натриевой соли карбоксиметилцеллюлозы и N-винилимидазола. Структура полученных продуктов подтверждена методом ИК-спектроскопии. Методами просвечивающей электронной микроскопии, динамического светорассеяния и лазерного допплеровского микроэлектрофореза установлено, что частицы дисперсий сополимеров имеют несферическую форму и отрицательный электрокинетический потенциал. Изучено влияние присутствие хлорида натрия на гидродинамический радиус частиц полимеров
 
 
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Melonite from Kingash and Kuskanak, Eastern Sayans, Russia, and the extent of Bi-for-Te substitution in melonite and synthetic Ni(Te,Bi)2–x

AbstractWe describe occurrences of palladoan melonite in intimate intergrowths with cobaltite-gersdorffite from the Neoproterozoic dunite-wehrlite-gabbro complexes of Kingash and Kuskanak, Eastern Sayans, Russia. The observed compositional trends of melonite are consistent with the overallvariations examined on the basis of numerous literature sources. The levels of Bi in NiTe2are normally limited to ≤0.25 Bi atoms per formula unit (apfu), under natural conditions. Greater levels (≤0.5 Bi apfu) are associated with the (Pd + Pt) enrichment in the palladoanvarieties. The telluride–sulfarsenide intergrowths probably formed at Kingash and Kuskanak late in the crystallization history of the ore zones, from microdroplets of residual melt rich in semimetals (Te, Bi, As) and noble metals (Pd and Ag), below the solidus of the enclosing gabbroicrocks and within a narrow range of temperatures (500–550°C). On the basis of our observations made on specimens of melonite and synthetic Ni(Te,Bi)2–x(x = 0.6), we infer that the limit of incorporation of Bi into a melonitetype phase is ≤0.5 Bi apfu.

Th nite is full uv zanee blessings

th nite is full uv zanee blessings

Thermodynamic properties over (Ni2Te3O8 + NiTe2O5) in the Ni–Te–O system: Transpiration thermogravimetric and Knudsen effusion mass spectrometric studies

Abstract Vaporisation studies over (Ni2Te3O8 + NiTe2O5) in the Ni–Te–O system were carried out by means of transpiration thermogravimetry (TTG) and Knudsen effusion mass spectrometry (KEMS) in the temperature ranges of 950 – 1 060 K and 850 – 950 K respectively. The transpiration measurements were performed for the first time. Comparison of total pressures obtained by TTG with that deduced using partial pressures of vaporising species from KEMS showed a good agreement providing reliable vapour pressures over this phase region. From vapour pressures, enthalpies of solid–gas and gas-phase equilibria and subsequently enthalpy and Gibbs free energies of formation of NiTe2O5(s) were derived. A thermochemical calculation was performed to assess the possibility of formation of the ternary NiTe2O5(s) phase on stainless steel clad of mixed-oxide fuelled fast breeder nuclear reactors.

BUCKLING OF ANISOTROPIC PLATES BY THE RITZ METHOD

The Ritz method is used in the buckling analysis of anisotropic plates under several combinations of in-plane loads and boundary conditions. Ritz bases are generated from modi ed Legendre polynomials, and the plate rigidities are carefully chosen to provide thermodynamically admissible materials. The accuracy of the proposed approach is assessed by means of several examples solved by nite element models.

PARTITION OF MEASURABLE SETS

The theory of vector measure has attracted much interest among researchers in the recent past. Available results show that measurability concepts of the Lebesgue measure have been used to partition subsets of the real line into disjoint sets of nite measure. In this paper we partition measurable sets in ℜn for n ≥ 3 into disjoint sets of nite dimension.

Mean Curvature Flow of Submanifolds With Small Traceless Second Fundamental Form

Consider a family of smooth immersions F(; t) : Mn ! Rn+k of submanifolds in Rn+k moving by mean curvature ow @F @t = ~H, where ~H is the mean curvature vector for the evolving submanifold. We prove that for any n 2 and k 1, the ow starting from a closed submanifold with small L2-norm of the traceless second fundamental form contracts to a round point in nite time, and the corresponding normalized ow converges exponentially in the C1-topology, to an n-sphere in some subspace Rn+1 of Rn+k.

Vaporization studies over (NiO + Ni2Te3O8) in the Ni–Te–O system by transpiration thermogravimetry and Knudsen effusion mass spectrometry

Vaporization studies over (NiO+Ni2Te3O8) in the Ni–Te–O system were carried out by transpiration thermogravimetry (TTG) and Knudsen effusion mass spectrometry (KEMS) in the temperature ranges of 960–1085K and 850–960K, respectively. Comparison of total pressures obtained by TTG with that deduced using partial pressures of vaporizing species from KEMS showed a good agreement providing reliable vapor pressures over this phase region. From vapor pressures, enthalpies of solid–gas and gas-phase equilibria were evaluated. Subsequently, enthalpy and Gibbs free energies of formation of Ni2Te3O8(s) were deduced at 298.15K: ΔfHm°=−1543±46kJmol−1; ΔfGm°=−1294±46kJmol−1. A thermochemical assessment was made to examine the possibility of formation of the ternary Ni2Te3O8(s) phase on stainless steel clad of mixed-oxide fuelled fast breeder nuclear reactors.

Set matrix theory as a physically motivated generalization of Zermelo-Fraenkel set theory

Recently, the Elementary Process Theory (EPT) has been developed as a set of fundamental principles that might underlie a gravitational repulsion of matter and antimatter. This paper presents set matrix theory (SMT) as the foundation of the mathematicallogical framework in which the EPT has been formalized: it is, namely, objectionable to use Zermelo-Fraenkel set theory (ZF) as such. SMT is a generalization of ZF: whereas ZF uses only sets as primitive objects, in the framework of SMT nite matrices with set-valued entries are objects sui generis, with a 1 1 set matrix [x] being identical to the set x. It is proved that every set that can be constructed in ZF can also be constructed in SMT: as a mathematical foundation, SMT is thus not weaker than ZF. In addition, it is shown that SMT is more suitable than ZF for the intended application to physics. The conclusion is that SMT, contrary to ZF, is acceptable as the mathematical-logical foundation of the framework for physics that is determined by the EPT.

Prophylactic pancreatic duct stenting for biliary-type stenosis of Oddi sphincter with difficult cannu- lation

Objective To evaluate the clinical value and efficacy of prophylactic pancreatic duct stenting for biliary-type stenosis of Oddi sphincter with difficulty cannulation. Methods The present study was a retrospective study of 63 patients with biliary-type stenosis of Oddi sphincter and difficult cannulation. The stent group consisted 30 patients who underwent prophylactic pancreatic duct stenting from February 2010 to February 2011 and the control group included 33 patients who underwent only ERCP without prophy- lactic pancreatic duct stenting from January 2009 to January 2010. The incidence of postoperative pancreatitis were compared between the two groups. Results The incidence of postoperative pancreatitis of the control group was significantly higher than that of the stent group （ P 〈 0. 05 ）. Conclusion For patients with defi- nite diagnosis of biliary-type stenosis of Oddi sphincter and difficult cannulation, prophylactic pancreatic duet stent placement is safe and effective. Key words: Cholangiopancreatography, endoscopic retrograde ; Sphincter of Oddi dysfunction ; Pancreatitis ; Stents

The new nickel tellurite chloride compound Ni15Te12O34Cl10– synthesis, crystal structure and magnetic properties

A new nickel tellurite oxohalide, Ni(15)Te(12)O(34)Cl(10), has been prepared by chemical vapour transport reactions and the crystal structure was determined by single-crystal X-ray diffraction. The compound crystallizes in the triclinic space group P1[combining macron] with the pseudomonoclinic cell parameters a = 10.3248(6) Å, b = 10.3249(6) Å, c = 11.6460(8) Å, α = 73.782(6)°, β = 73.782(6)°, γ = 63.51(2)°, Z = 1, R(1) = 0.0264. The Ni(2+) ions have octahedral [NiO(6)] and [NiO(4)Cl(2)] coordinations, the Te(4+) ions have one-sided [TeO(3)] and [TeO(4)] coordinations. The crystal structure can be described as consisting of nickel oxide ribbons extending along (001) that are connected by corner sharing [TeO(3)] and [TeO(4)] groups to build the open framework structure. The chlorine atoms and the Te-lone pairs are facing voids in the oxide framework. The new compound undergoes two successive antiferromagnetic ordering transitions at ∼50 K and ∼10 K. The Curie-Weiss temperature obtained from detailed evaluation of the high-temperature magnetic susceptibilities is positive indicating predominant ferromagnetic superexchange interactions between the Ni magnetic moments.