bluuebunny/crossref_metadata_2025 huggingface dataset:
Die Onkonet-Datenbank: Bilanz einer Internet-basierten, multizentrischen Dokumentationsplattform zur Erfassung der operativen Therapie des Prostatakarzinoms
Authors: Pohle Margit , Magheli Ahmed , Diederichs Wolfgang , Ecke Thorsten , Fischer Tom , Kempkensteffen Carsten , Knispel Helmut , Lehsnau Mike , Miller Kurt , Pretzer Jana , Schostak Martin , Winter Alexander , Zacharias Mario , Hinz Stefan
Published: June 2019

Einleitung Mit der vom Berliner Tumorzentrum e. V. entwickelten und koordinierten Onkonet-Datenbank (http://www.prostata-ca.net) wurden seit Januar 2005 deutschlandweit prä-, peri- und postoperative Parameter zur radikalen Prostatektomie dokumentiert. Durch die besonders anwenderfreundliche Nutzbarkeit sollte Onkonet die operative Versorgung des Prostatakarzinoms in Deutschland abbilden und ihre Qualität durch ein integriertes Benchmarking-Tool verbessern.

Ziel der vorliegenden Arbeit war es, alle bis heute dokumentierten Daten aus Onkonet zu analysieren. Im Fokus waren hierbei die Vollständigkeit und Plausibilität der Daten, um die Möglichkeiten und Grenzen weiterer Auswertungen zu prüfen und gegebenenfalls zu definieren.

Patienten und Methoden In die retrospektive Studie wurden alle in Onkonet dokumentierten Verläufe von Prostatakarzinompatienten eingeschlossen, die sich bis Juni 2018 in den am Projekt beteiligten Kliniken einer radikalen Prostatektomie unterzogen hatten. Die Vollständigkeit der Dokumentation aller Patientenverläufe wurde mit Hilfe von Excel 2013 analysiert. Die statistische Auswertung erfolgte deskriptiv.

Ergebnisse In Onkonet wurden insgesamt 21 474 Patienten angelegt, bei 56 % (12 591) davon waren das Geburts-, OP, Aufnahme- und Entlassungsdatum, der initiale PSA-Wert, Gleason Score der Stanzbiopsie, klinisches T-Stadium, pathologisches T-Stadium, pathologischer Gleason-Score sowie die OP-Technik vollständig dokumentiert.

Die Vollständigkeit der präoperativen Parameter lag im Mittel bei 26,8 %, die zum stationären Aufenthalt bei 64,5 % und die zur Pathologie bei 58,1 %. Hierbei waren das pT-Stadium bei 80,1 %, das N-Stadium bei 78,8 %, das M-Stadium bei 74,8 %, der pathologische Gleason-Score bei 78,7 % und Informationen zum R1-Status bei 78,7 % der Patienten dokumentiert. Die Dokumentationsvollständigkeit der Nachsorgeparameter lag bei 8,1 %, wobei bei 27,2 % ein PSA-Wert, bei 23,0 % Informationen zur Kontinenz und bei 13,9 % Informationen zur Potenz vorlag.

Schlussfolgerung Mit 21 474 erfassten Patientenverläufen und über 200 dokumentierbaren Parametern stellt Onkonet eines der umfangreichsten klinischen Register zur Dokumentation von Prostatakarzinom-Patientenverläufen dar. Die Datenanalyse zeigte, dass die Grenzen einer solchen Datenbank insbesondere in der hohen Anzahl von Parametern sowie der hohen Fehleranfälligkeit aufgrund der manuellen Eingabe liegen.
Delta-doped SrTiO3 top-gated field effect transistor
Authors: Inoue Hisashi , Yoon Hyeok , Merz Tyler A. , Swartz Adrian G. , Hong Seung Sae , Hikita Yasuyuki , Hwang Harold Y.
Published: June 2019

Oxide heterostructures are an attractive platform for incorporation in field-effect transistors (FETs) due to their diverse physical properties which can be tuned by electrostatic gating. We report a top-gated FET based on a SrTiO3 delta-doped structure, which operates down to cryogenic temperatures. The device shows excellent DC characteristics with an on/off ratio greater than 104 and field effect mobility estimated to be 2125 cm2/V s at 2 K. The high field effect mobility was consistent with the Hall mobility and is attributed to the formation of a two-dimensional electron system in the delta-doped layer: two-dimensional gate-tunable Shubnikov-de Haas oscillations confirm this. The achievement of an electron density of 3 × 1012 cm−2 in a gate-tunable geometry allows for the exploration of the interplay between magnetic, ferroelectric, and superconducting properties of SrTiO3 in the quantum limit.
Vertical geometry 33.2 A, 4.8 MW cm2 Ga2O3 field-plated Schottky rectifier arrays
Authors: Yang Jiancheng , Xian Minghan , Carey Patrick , Fares Chaker , Partain Jessica , Ren Fan , Tadjer Marko , Anber Elaf , Foley Dan , Lang Andrew , Hart James , Nathaniel James , Taheri Mitra L. , Pearton S. J. , Kuramata Akito
Published: June 2019

The performance of arrays consisting of 21 β-Ga2O3 field-plated rectifiers fabricated on thick epitaxial layers (n-type carrier concentration ∼1.6 × 1016 cm−3) grown on conducting substrates (carrier concentration 3 × 1019 cm−3) is reported. We show that by interconnecting the output of 21 smaller (0.4 × 0.4 mm2 to 1 × 1 mm2, total area 0.09 cm2) individual rectifiers using e-beam deposited Au, we can achieve a high total forward output current of 33.2 A, at 4.25 V in the single-sweep voltage mode, and a low forward turn-on voltage of 2.9 V (defined at 100 A cm−2) and maintain a reverse breakdown voltage of 240 V (defined at 1 μA cm−2). The current density was 376 A cm−2, and the on-state resistance was 0.012 Ω cm2. The total forward current was 10 A at 1.9 V and 22 A at 3 V. The power figure-of-merit for the array, VB2/RON, was 4.8 MW cm−2, with a reverse recovery time of individual rectifiers of 32 ns. The on/off ratio of the rectifier array was in the range of 105–1010 for +1 V/−1 to −100 V.
Highly sensitive handheld diamond magnetic field sensor allows for bio-diagnostics
Authors: Johnson-Groh Mara
Published: June 2019

A new compact device shows promise for field testing nanotesla scale magnetic fields in biological samples and mechanical systems.
Up-regulation of FOXO1 and reduced inflammation by β-hydroxybutyric acid are essential diet restriction benefits against liver injury
Authors: Miyauchi Tomoyuki , Uchida Yoichiro , Kadono Kentaro , Hirao Hirofumi , Kawasoe Junya , Watanabe Takeshi , Ueda Shugo , Okajima Hideaki , Terajima Hiroaki , Uemoto Shinji
Published: June 2019

Significance

Long-term fasting for more than 24 h has been reported to ameliorate liver ischemia and reperfusion injury (IRI). However, it is difficult to apply long-term fasting for human preoperative management, and the underlying molecular mechanisms remain unclear. Our present research demonstrates that 12-h fasting remarkably ameliorates liver IRI. The 12-h fasting induces up-regulation of FOXO1 by raising the level of acetylated histone and β-hydroxybutyric acid, followed by up-regulation of antioxidative enzyme and autophagy activity, and improves liver IRI through the reduction of the inflammation and apoptotic cell death. Perioperative administration of β-hydroxybutyric acid or histone deacetylase inhibitor may have beneficial effects by avoiding liver injury at liver surgery. This is an insight on the prevention of liver IRI.
Inheritance, contact, convergence
Authors: Yakpo Kofi
Published: June 2019

This article provides a comparative analysis of the suppletive allomorphy of two personal pronouns in the five African English-lexifier Creoles (AECs) Krio (Sierra Leone), Pichi (Equatorial Guinea), Ghanaian Pidgin English, Nigerian Pidgin, and Cameroon Pidgin. The alternation of the 3sgobject forms=àm(a clitic) andín(a non-clitic) is conditioned by a tonal obligatory contour principle (ocp), a vowel heightocp, animacy, and focus in different constellations across the five AECs. In addition, an epenthetic /r/ is recruited in four of the AECs to ensure that theocpis not breached. The analyses suggest that pronominal suppletion in the AECs has been fashioned by processes of change and differentiation typical of geographically extensive language families, such as migration from linguistic homelands, acquisition by non-founder populations, interlectal cross-diffusion, as well as contact and convergence with adstrate, substrate, and superstrate languages.
Alignment, ‘politeness’ and implicitness in Chinese political discourse
Authors: Kádár Dániel Z. , Zhang Sen
Published: June 2019

This paper aims to examine the ways in which official Chinese written monologues implicitly trigger alignment with the public in the wake of national social crises. Our understanding of alignment encompasses the attitude of creating an authoritative line of discourse, which in turn triggers the responsive alignment of the receivers with the decision makers. We believe that alignment is a fundamental concept to understand how linguistic politeness operates in political monologues such as gong’gao. Such texts are rich in forms of deference such as honorifics and other ritual phrases used towards Chinese politicians. The reason why such forms of politeness deserve special attention in language and politics is that they are not interpersonal, and their use correlates with implicit communication.
SFI1 promotes centriole duplication by recruiting USP9X to stabilize the microcephaly protein STIL
Authors: Kodani Andrew , Moyer Tyler , Chen Allen , Holland Andrew , Walsh Christopher A. , Reiter Jeremy F.
Published: June 2019

In mammals, centrioles participate in brain development, and human mutations affecting centriole duplication cause microcephaly. Here, we identify a role for the mammalian homologue of yeast SFI1, involved in the duplication of the yeast spindle pole body, as a critical regulator of centriole duplication in mammalian cells. Mammalian SFI1 interacts with USP9X, a deubiquitylase associated with human syndromic mental retardation. SFI1 localizes USP9X to the centrosome during S phase to deubiquitylate STIL, a critical regulator of centriole duplication. USP9X-mediated deubiquitylation protects STIL from degradation. Consistent with a role for USP9X in stabilizing STIL, cells from patients with USP9X loss-of-function mutations have reduced STIL levels. Together, these results demonstrate that SFI1 is a centrosomal protein that localizes USP9X to the centrosome to stabilize STIL and promote centriole duplication. We propose that the USP9X protection of STIL to facilitate centriole duplication underlies roles of both proteins in human neurodevelopment.
Cartilage-binding antibodies induce pain through immune complex–mediated activation of neurons
Authors: Bersellini Farinotti Alex , Wigerblad Gustaf , Nascimento Diana , Bas Duygu B. , Morado Urbina Carlos , Nandakumar Kutty Selva , Sandor Katalin , Xu Bingze , Abdelmoaty Sally , Hunt Matthew A. , Ängeby Möller Kristina , Baharpoor Azar , Sinclair Jon , Jardemark Kent , Lanner Johanna T. , Khmaladze Ia , Borm Lars E. , Zhang Lu , Wermeling Fredrik , Cragg Mark S. , Lengqvist Johan , Chabot-Doré Anne-Julie , Diatchenko Luda , Belfer Inna , Collin Mattias , Kultima Kim , Heyman Birgitta , Jimenez-Andrade Juan Miguel , Codeluppi Simone , Holmdahl Rikard , Svensson Camilla I.
Published: June 2019

Rheumatoid arthritis–associated joint pain is frequently observed independent of disease activity, suggesting unidentified pain mechanisms. We demonstrate that antibodies binding to cartilage, specific for collagen type II (CII) or cartilage oligomeric matrix protein (COMP), elicit mechanical hypersensitivity in mice, uncoupled from visual, histological and molecular indications of inflammation. Cartilage antibody–induced pain-like behavior does not depend on complement activation or joint inflammation, but instead on tissue antigen recognition and local immune complex (IC) formation. smFISH and IHC suggest that neuronal Fcgr1 and Fcgr2b mRNA are transported to peripheral ends of primary afferents. CII-ICs directly activate cultured WT but not FcRγ chain–deficient DRG neurons. In line with this observation, CII-IC does not induce mechanical hypersensitivity in FcRγ chain–deficient mice. Furthermore, injection of CII antibodies does not generate pain-like behavior in FcRγ chain–deficient mice or mice lacking activating FcγRs in neurons. In summary, this study defines functional coupling between autoantibodies and pain transmission that may facilitate the development of new disease-relevant pain therapeutics.
Experimental Realization of an Intrinsic Magnetic Topological Insulator*
Authors: Gong Yan , Guo Jingwen , Li Jiaheng , Zhu Kejing , Liao Menghan , Liu Xiaozhi , Zhang Qinghua , Gu Lin , Tang Lin , Feng Xiao , Zhang Ding , Li Wei , Song Canli , Wang Lili , Yu Pu , Chen Xi , Wang Yayu , Yao Hong , Duan Wenhui , Xu Yong , Zhang Shou-Cheng , Ma Xucun , Xue Qi-Kun , He Ke
Published: June 2019

An intrinsic magnetic topological insulator (TI) is a stoichiometric magnetic compound possessing both inherent magnetic order and topological electronic states. Such a material can provide a shortcut to various novel topological quantum effects but remained elusive experimentally for a long time. Here we report the experimental realization of thin films of an intrinsic magnetic TI, MnBi
2
Te
4
, by alternate growth of a Bi
2
Te
3
quintuple layer and a MnTe bilayer with molecular beam epitaxy. The material shows the archetypical Dirac surface states in angle-resolved photoemission spectroscopy and is demonstrated to be an antiferromagnetic topological insulator with ferromagnetic surfaces by magnetic and transport measurements as well as first-principles calculations. The unique magnetic and topological electronic structures and their interplays enable the material to embody rich quantum phases such as quantum anomalous Hall insulators and axion insulators at higher temperature and in a well-controlled way.
Ionic-Liquid-Gating Induced Protonation and Superconductivity in FeSe, FeSe0.93S0.07, ZrNCl, 1T-TaS2 and Bi2Se3
*
Authors: Cui Yi , Hu Ze , Zhang Jin-Shan , Ma Wen-Long , Ma Ming-Wei , Ma Zhen , Wang Cong , Yan Jia-Qiang , Sun Jian-Ping , Cheng Jin-Guang , Jia Shuang , Li Yuan , Wen Jin-Sheng , Lei He-Chang , Yu Pu , Ji Wei , Yu Wei-Qiang
Published: June 2019

We report protonation in several compounds by an ionic-liquid-gating method, under optimized gating conditions. This leads to single superconducting phases for several compounds. Non-volatility of protons allows post-gating magnetization and transport measurements. The superconducting transition temperature T
c
is enhanced to 43.5 K for FeSe
0.93
S
0.07
, and 41 K for FeSe after protonation. Superconducting transitions with T
c ∼ 15 K for ZrNCl, ∼7.2 K for 1T-TaS
2
, and ∼3.8 K for Bi
2
Se
3
are induced after protonation. Electric transport in protonated FeSe
0.93
S
0.07
confirms high-temperature superconductivity. Our
1
H nuclear magnetic resonance (NMR) measurements on protonated FeSe
1−x

S

x

reveal enhanced spin-lattice relaxation rate 1/1
T
1
with increasing x, which is consistent with the LDA calculations that H
+
is located in the interstitial sites close to the anions.
Simulation and measurement of millimeter-wave radiation from Josephson junction array*
Authors: Zhang Xin , Zhao Sheng-Hui , Wang Li-Tian , Xing Jian , Zhang Sheng-Fang , Liang Xue-Lian , He Ze , Wang Pei , Zhao Xin-Jie , He Ming , Ji Lu
Published: June 2019

We report the circuit simulations and experiments of millimeter-wave radiation from a high temperature superconducting (HTS) bicrystal Josephson junction (BJJ) array. To study the effects of junction characteristic parameters on radiation properties, new radiation circuit models are proposed in this paper. The series resistively and capacitively shunted junction (RCSJ) models are packaged into a Josephson junction array (JJA) model in the simulation. The current-voltage characteristics (IVCs) curve and radiation peaks are simulated and analyzed by circuit models, which are also observed from the experiment at liquid nitrogen temperature. The experimental radiation linewidth and power are in good agreement with simulated results. The presented circuit models clearly demonstrate that the inconsistency of the JJA will cause a broad linewidth and a low detected power. The junction radiation properties are also investigated at the optimal situation by circuit simulation. The results further confirm that the consistent JJA characteristic parameters can successfully narrow the radiation linewidth and increase the power of junction radiation.
Structure, conductivity, and ion emission properties of RbAg4I5 solid electrolyte film prepared by pulsed laser deposition*
Authors: Chen Jun-Lian , Zuo Wen-Bin , Ke Xian-Wen , B Tolstoguzov Alexander , Tian Can-Xin , Devi Neena , Jha Ranjana , N Panin Gennady , Fu De-Jun
Published: June 2019

We fabricated a silver ion emitter based on the solid state electrolyte film of RbAg4I5 prepared by pulsed laser deposition. The RbAg4I5 target for PLD process was mechano-chemically synthesized by high-energy ball milling in Ar atmosphere using β-AgI and RbI as raw materials. The ion-conducting properties of RbAg4I5 were studied by alternating current (AC) impedance spectroscopy and the ionic conductivity at room temperature was estimated 0.21 S/m. The structure, morphology, and elemental composition of the RbAg4I5 film were investigated. The Ag+ ion-conducting property of the prepared superioni-conductor film was exploited for ion–beam generation. The temperature and accelerating voltage dependences of the ion current were studied. Few nA current was obtained at the temperature of 196 °C and the accelerating voltage of 10 kV.
Photo-transmutation based on resonance γ-ray source*
Authors: Fu Guang-Yong , Dang Yong-Le , Liu Fu-Long , Wu Di , He Chuang-Ye , Wang Nai-Yan
Published: June 2019

High intensity γ-ray source can be obtained through resonance reaction induced by protons. In this work, the possibility of using such high intensity MeV-range γ-ray source to transmute nuclear waste is investigated through Mont Carlo simulation. 197Au(γ, n)196Au experiment is performed to obtain the transmutation rate and compared with the simulation result. If the current of the proton beam is 10 mA at the resonance energy of 441 keV, with the γ photons emitted from 7Li(p, γ)8Be, then the corresponding transmutation yield for 129I in 2π direction can reach 9.4×109 per hour. The result is compared with that of LCS γ-ray source.
Charge-state populations for the neon-XFEL system*
Authors: Deng Ping , Jiang Gang
Published: June 2019

The interaction between neon and x-ray free-electron lasers with different laser parameters is systematically studied by solving a set of coupled rate equations. As an example, the evolution of 1s12s22p6 configuration is given under different incident photon numbers, pulse widths, and photon energies. We have also determined all of the charge-state populations as a function of three laser pulse parameters by averaging over time. The result shows that the variations of these charge-state populations demonstrate a pattern when the pulse width is shorter than 10 fs: some of the charge-states decrease rapidly, while the others rise but remain relatively constant for pulse width larger than 10 fs. The variation of the average charge with three parameters has also obtained. The average charge decreases for a pulse width shorter than 10 fs but remains basically unchanged for a pulse width longer than 10 fs.
Supercontinuum generation of highly nonlinear fibers pumped by

1.57

-

μ
m

laser soliton*
Authors: Fan Song-Tao , Zhang Yan-Yan , Yan Lu-Lu , Guo Wen-Ge , Zhang Shou-Gang , Jiang Hai-Feng
Published: June 2019

Highly nonlinear fibers (HNLFs) are crucial components for supercontinuum (SC) generation with laser solution. However, it is difficult to exactly estimate the structure of produced SC according to material parameters. To give a guideline for choosing and using HNLFs for erbium-fiber-based optical applications, we demonstrate SC generation in five types of HNLFs pumped by 1.57-

μ
m

laser solitons. All five fibers output a SC exceeding 1000 nm. Three different SC formation processes were observed in the experiment. By comparing optical parameters of these fibers, we find the zero dispersion wavelength (ZDW) of fiber has an important influence on the SC structure and energy distribution for a given pump source.
Macadam’s theory in RGB laser display*
Authors: Wang Guan , Yang Yuhua , Dong Tianhao , Gu Chun , Xu Lixin , Ouyang Zhongcan , Xu Zuyan
Published: June 2019

We have developed Macadam’s theory to deal with RGB laser display, which can well describe the color gamut display system varying with the laser bandwidth. By calculating the volume of Rösch–Macadam color solid of laser display system under the Rec.2020 standard, we can obtain that the volume of chromatic stereoscopic at 30-nm laser spectral linewidth is about 90% of that at 1 nm laser spectral linewidth, which is important in laser display system to trade off the color gamut and the suppression of laser speckles. Moreover, we can also calculate the color gamut volume with different primary numbers and different primary wavelengths.
Effects of thiocyanate anions on switching and structure of poly(N-isopropylacrylamide) brushes*
Authors: Zhao Xin-Jun , Gao Zhi-Fu
Published: June 2019

In this work, we investigate the effects of thiocyanate anions on the switching and the structure of poly (N-isopropylacrylamide) (PNIPAM) brushes using a molecular theory. Our model takes into consideration the PNIPAM–anion bonds, the electrostatic effects and their explicit coupling to the PNIPAM conformations. It is found that at low thiocyanate anion concentration, as the anion concentration of thiocyanate increases, thiocyanate anions are more associated with PNIPAM chains through the PNIPAM–anion bonds, which contributes to stronger electrostatic repulsion and leads to an increase of lower critical solution temperature (LCST). By analyzing the average volume fractions of PNIPAM brushes, it is found that the PNIPAM brush presents a plateau structure. Our results show that the thiocyanate anions promote phase segregation due to the PNIPAM–anion bonds and the electrostatic effect. According to our model, the reduction of LCST can be explained as follows: at high thiocyanate anion concentration, with the increase of thiocyanate concentration, more ion bindings occurring between thiocyanate anions and PNIPAM chains will result in the increase of the hydrophobicity of PNIPAM chains; when the increase of electrostatic repulsion is insufficient to overcome the hydrophobic interaction of PNIPAM chains, it will lead to the reduction of brush height and LCST at high thiocyanate anion concentration. Our theoretical results are consistent with the experimental observations, and provide a fundamental understanding of the effects of thiocyanate on the LCST of PNIPAM brushes.
Formation and preferred growth behavior of grooved seed silicon substrate for kerfless technology*
Authors: Yan Jing-Yuan , Wang Yong-Wei , Guo Yong-Ming , Zhang Wei , Wang Cong , An Bao-Li , Liu Dong-Fang
Published: June 2019

Kerfless technology is a promising alternative for reducing cost and providing flexible thin crystals in silicon-based semiconductors. In this work we propose a protruded seed substrate technology to prepare flexible monocrystalline Si thin film economically. Grooved seed substrate is fabricated by using SiN
x
thin film as a mask for the wet-etching and thermal oxidation process. After the SiN
x
layer on the wedged strip is removed by hot phosphoric acid, the pre-defined structured substrate is achieved with the top of the strip serving as the seed site where there is no oxide layer. And a preferred growth of epitaxial Si on the substrate is performed by introducing an intermittent feed method for silicon source gas. The technique in this paper obviously enhances the mechanical stability of the seed structure and the growth behavior on the seed sites, compared with our previous techniques, so this technique promises to be used in the industrial fabrication of flexible Si-based devices.
Temperature-dependent subband mobility characteristics in n-doped silicon junctionless nanowire transistor*
Authors: Dou Ya-Mei , Han Wei-Hua , Guo Yang-Yan , Zhao Xiao-Song , Zhang Xiao-Di , Wu Xin-Yu , Yang Fu-Hua
Published: June 2019

We have investigated the temperature-dependent effective mobility characteristics in impurity band and conduction subbands of n-doped silicon junctionless nanowire transistors. It is found that the electron effective mobility of the first subband in 2-fold valleys is higher than that of the second subband in 4-fold valleys. There exists a maximum value for the effective subband mobilities at low temperatures, which is attributed to the increase of thermally activated electrons from the ionized donors in the impurity band. The experimental results indicate that the effective subband mobility is temperature-dependent on the electron interactions by thermal activation, impurity scattering, and intersubband scattering.
Direct deposition of graphene nanowalls on ceramic powders for the fabrication of a ceramic matrix composite*
Authors: Zhou Hai-Tao , Liu Da-Bo , Luo Fei , Tian Ye , Chen Dong-Sheng , Luo Bing-Wei , Zhou Zhang , Shen Cheng-Min
Published: June 2019

Uniform mixing of ceramic powder and graphene is of great importance for producing ceramic matrix composite. In this study, graphene nanowalls (GNWs) are directly deposited on the surface of Al2O3 and Si3N4 powders using chemical vapor deposition system to realize the uniform mixing. The morphology and the initial stage of the growth process are investigated. It is found that the graphitic base layer is initially formed parallel to the powder surface and is followed by the growth of graphene nanowalls perpendicular to the surface. Moreover, the lateral length of the graphene sheet could be well controlled by tuning the growth temperature. GNWs/Al2O3 powder is consolidated by using sparking plasma sintering method and several physical properties are measured. Owing to the addition of GNWs, the electrical conductivity of the bulk alumina is significantly increased.
Spin glassy behavior and large exchange bias effect in cubic perovskite Ba0.8Sr0.2FeO3-δ*
Authors: Liu Yu-Xuan , Liu Zhe-Hong , Ye Xu-Bin , Shen Xu-Dong , Wang Xiao , Zhou Bo-Wen , Zhou Guang-Hui , Long You-Wen
Published: June 2019

A single-phase iron oxide Ba0.8Sr0.2FeO3-δ
with a simple cubic perovskite structure in Pm-3m symmetry is successfully synthesized by a solid-state reaction method in O2 flow. The oxygen content is determined to be about 2.81, indicating the formation of mixed Fe3+ and Fe4+ charge states with a disorder fashion. As a result, the compound shows small-polaron conductivity behavior, as well as spin glassy features arising from the competition between the ferromagnetic interaction and the antiferromagnetic interaction. Moreover, the competing interactions also give rise to a remarkable exchange bias effect in Ba0.8Sr0.2FeO2.81, providing an opportunity to use it in spin devices.
Improved electrochemical performance of Li(Ni0.6Co0.2Mn0.2)O2 at high charging cut-off voltage with Li1.4Al0.4Ti1.6(PO4)3 surface coating*
Authors: Wang Yi , Liu Bo-Nan , Zhou Ge , Nie Kai-Hui , Zhang Jie-Nan , Yu Xi-Qian , Li Hong
Published: June 2019

Li(Ni0.6Co0.2Mn0.2)O2 has been surface-modified by the lithium-ion conductor Li1.4)Al0.4)Ti1.6)(PO4)3 via a facile mechanical fusion method. The annealing temperature during coating process shows a strong impact on the surface morphology and chemical composition of Li(Ni0.6Co0.2Mn0.2)O2. The 600-°C annealed material exhibits the best cyclic stability at high charging cut-off voltage of 4.5 V (versus Li

+

/Li) with the capacity retention of 90.9% after 100 cycles, which is much higher than that of bare material (79%). Moreover, the rate capability and thermal stability are also improved by Li1.4)Al0.4)Ti1.6)(PO4)3 coating. The enhanced performance can be attributed to the improved stability of interface between Li(Ni0.6Co0.2Mn0.2)O2 and electrolyte by Li1.4)Al0.4)Ti1.6)(PO4)3 modification. The results of this work provide a possible method to design reliable cathode materials to achieve high energy density and long cycle life.
Theoretical study of overstretching DNA–RNA hybrid duplex*
Authors: Yang Dong-Ni , Zhong Zhen-Sheng , Liu Wen-Zhao , Rujiralai Thitima , Ma Jie
Published: June 2019

DNA–RNA hybrid (DRH) plays important roles in many biological processes. Here, we use a thermodynamic theory to analyze the free energy and unpeeling properties of the overstretching transition for the DRH molecule and compare the results with double-helix DNA. We report that the RNA strand of DRH is easier to get unpeeled than the DNA strand while the difficulty in unpeeling the double helix DNA lies in between. We also investigate the sequence effect, such as GC content and purine content, on the properties of unpeeling the DRH. Further, to study the temperature effect, the force-temperature phase diagram of DRH and DNA are calculated and compared. Finally, using a kinetic model, we calculate the force–extension curves in the DRH stretching and relaxation process under different pulling rates and temperatures. Our results show that both pulling rate and temperature have important influences on the stretching and relaxation kinetics of unpeeling the DRH. Putting all these results together, our work provides a comprehensive view of both the thermodynamics and kinetics in DRH overstretching.
A novel ppm-precise absolute calibration method for precision high-voltage dividers
Authors: Rest O , Winzen D , Bauer S , Berendes R , Meisner J , Thümmler T , Wüstling S , Weinheimer C
Published: June 2019

The most common method to measure direct current high voltage (HV) down to the ppm-level is to use resistive high-voltage dividers. Such devices scale the HV into a range where it can be compared with precision digital voltmeters to reference voltages sources, which can be traced back to Josephson voltage standards. So far the calibration of the scale factors of HV dividers for voltages above 1 kV could only be done at metrology institutes and sometimes involves round-robin tests among several institutions to get reliable results. Here we present a novel absolute calibration method based on the measurement of a differential scale factor, which can be performed with commercial equipment and outside metrology institutes. We demonstrate that reproducible measurements up to 35 kV can be performed with relative uncertainties below

. This method is not restricted to metrology institutes and offers the possibility to determine the linearity of high-voltage dividers for a wide range of applications.
Determination of the thermodynamic temperature between 236 K and 430 K from speed of sound measurements in helium
Authors: Gavioso R M , Madonna Ripa D , Steur P P M , Dematteis R , Imbraguglio D
Published: June 2019

We report speed of sound measurements in helium at 273.16 K and at eight temperatures in the range between 236 K and 430 K. These results determine the difference (T  −  T
90) between the thermodynamic temperature T and its approximation T
90 by the International Temperature Scale of 1990 (ITS-90). The uncertainty of our measurements of (T  −  T
90) spans between a minimum of 0.25 mK near 247 K and a maximum of 0.89 mK at the freezing point of indium (429.75 K) with comparable contributions from the uncertainty of our acoustic determination of T and from the uncertainty of our laboratory realization of ITS-90. On the overlapping temperature ranges these results are consistent with other recent acoustic determinations of (T  −  T
90). We also present evidence that (T  −  T
90) can be determined with comparably small uncertainties by the alternative, time-saving procedure of measuring the speed-of-sound in helium using only a single, judiciously-chosen, pressure on each isotherm.
Refractive index for sulfur S8 molecules between graphene layers and inside graphite
Authors: Arellano J S , Salas O , Magaña L F
Published: June 2019

The refractive index for sulfur molecules adsorbed between graphene layers, and inside graphite is calculated. We remark some noticeable differences between the periodic system along the perpendicular direction to the graphite layers, and the system used to study a lonely sulfur molecule in interaction close to an isolated graphene layer. We obtained -0.00914 eV for the adsorption energy per sulfur atom when one S8 molecule is relaxed by means of self-consistent calculations (scf), and variable cell calculation (vcc), between two graphene layers, but we got a big positive energy 11.4954 eV for the possible insertion of the S8 molecule between a pair of more separated graphite layers, A and B (c = 7.7978 Å).
Calculation of band structures of a phononic crystal within a waveguide in 3D with cubic inclusions using a Periodic Green’s Function Method
Authors: Alva Medrano H , Guillén Gallegos C , Mendoza Suárez A , Pérez Aguilar H
Published: June 2019

The Phononic Crystals have generated a growing scientific interest as a means to control the dispersion of waves in various technological applications such as telecommunications. In particular, Phononic Crystal Waveguides are composed of periodic distributions of dispersers immersed in a propagation medium and, designed by an arrangement with dimensions and periods comparable to the wavelength. These crystals have properties that give them the ability to guide acoustic waves efficiently. In this paper, we present a numerical Boundary Element Method, which requires the use of a Periodic Green’s Function. This method allows to calculate the band structure of phononic crystals in two- and three-dimensions. In particular, the band structure is calculated for a waveguide formed by two flat, and parallel plates that involve a two-dimensional periodic arrangement of cubic inclusions. All surfaces involved are considered acoustic hard surfaces. The system considered, in addition to being a waveguide is in itself a phononic crystal, so that this type of systems present an alternative to manufacture to phononic crystal that can act as a phononic crystal and as an acoustic waveguide. These properties present some interest from a technological point of view.
Modeling of the optical response of two-dimensional hexagonal periodicity photonic structures with cylindrical inclusions with randomly rough surfaces that include dispersive LHM
Authors: Castillo-Gallardo V , Puente-Díaz L , Pérez-Aguilar H , Mendoza-Suárez A , Agarwal V
Published: June 2019

The interest to develop nanoscale devices is due to their ability to manipulate the optical properties through their structure. With an increasing interest in the recent decades, different types of Photonic Crystals (PC) have also been proposed. A PC is a periodically ordered material in which the refractive index is modulated. It has been shown in recent years that adding new materials to the structure of photonic crystals results in novel properties of these systems, which were originally conceived as composed of purely dielectric materials. One option is to consider this type of systems with dispersive Left-Handed Materials or metamaterials. The optical properties of the PCs depend on the type of periodicity, the geometry of the inclusions, the contrast of the refractive index and the filling fraction of the photonic structure. In this work, a numerical technique known as the Integral Equation Method was used to model the optical response of a two-dimensional photonic structure with a hexagonal lattice of cylindrical inclusions containing smooth and random rough surfaces that include dispersive LHM. It was obtained that the roughness of the inclusions modulates the optical response, in some cases varying the intensity and in others the direction of propagation. This property is very useful and has multiple applications in waveguides, filters, omnidirectional mirrors, beam splitters, etc.
Calculation of the Activation Energy for Super Plastic Flow in Zn-22Al Alloy
Authors: Muñoz-Andrade J.D. , Aguilar-Sánchez M.
Published: June 2019

The application of the unified physics is the way to understand the phenomenology and mechanics of super plastic flow (SPF). In this scenery, the main proposed in this work is to establish the effect of grain size and thermomechanical conditions on the activation energy for super plastic flow (Qspf) in Zn-22Al eutectoid alloy by applying the quantum mechanics and relativistic model (QM-RM) proposed by Muñoz-Andrade. Analyses on the experimental results reported before by some authors, it is shown for grain size of 0.35 μm that the calculated Qspf by using QM-RM for grain boundary sliding is 55.669 kJ/mol at 303 K and strain rate of 1 s−1. These results are in closed agreement with the value of Qa = 54 kJ/mol reported previously by using the theoretical and conventional methodology set up by Mohamed and Langdon. However, for grain size of 0.8μm, the calculated Qspf is 67.864 kJ/mol at 473 K and strain rate of 1×10−2 s−1. Furthermore, in order to understand the phenomenology and mechanics of SPF in Zn-22Al eutectoid alloy, the variation of the activation energy with the temperature; stress and strain rate is analyzed in association with coupled mechanisms during SPF, such as grain boundary sliding, cooperative grain boundary sliding and self-accommodation process related to the microstructure.
Photocatalytic degradation of Rhodamine B under UV irradiation over anatase TiO2:Ln3+ nanoparticles
Authors: Domínguez-Flores R , Palacios-Grijalva L N , Martínez A
Published: June 2019

TiO2:Ln3+ (Ln3+: Ce3+, Yb3+ and Sm3+) nanoparticles were prepared by solgel method under laboratory ambient conditions by using titanium tetraisopropoxide (C12H28O4Ti) as the TiO2 source and template, and the as-synthetized samples were characterized by XRD and UV-vis DRS techniques. XRD patterns shows that the as- prepared nanomaterials exhibit tetragonal anatase-phase. The photoactivity of the synthetized catalysts was tested in the photocatalytic degradation of a Rhodamine B solution exposed to the following radiation wavelenghts (254 nm, 350 nm, 365 nm, and 385 nm). UV-vis espectroscopy analysis of the samples was used to estimate the band gap energy of the samples.
Structure factor of colloidal magnetic fluid
Authors: Peredo-Ortíz R , Hernández-Contreras M
Published: June 2019

We determined with Langevin dynamics simulations the structure factor of a monodisperse ferrofluid as a function of the density of the suspension, and dipole strength in the particles valid for hard ferrofluids. The structure factor shows the transition from a liquid-like ordering of the particles at low density and dipole moment up to the formations of chain structures at high dipole strength. The collective diffusion coefficient shows a decaying dependence on the dipole moment magnitude for low density of colloid, however, at a high density, such a dependence gets reversed, and the diffusion increases with the dipole moment.
Application of dimensional analysis in the study of impact behaviour on tank truck structures
Authors: Vega-Ángeles A , Barrales-Guadarrama V R , Vargas-Arista B , Aguilar-Sánchez M , Barrales-Guadarrama R , Polo-Velázquez A
Published: June 2019

Nowadays, the analyses of impact of metallic structural elements of big dimensions are very expensive and dangerous due to the fact that the tests are destructive in nature and involve impact forces of the order of Meganewtons. That is the reason why searching for new alternatives that make these analyses easier and cheaper and that ensure the safety for those carrying the tests is necessary. No significative differences in the stress and strain of impact results were observed in a small scale from those obtained at full scale, if the laws for modeling of dimensional analysis are observed, in fact result differences were around 1%. We concluded that dimensional analysis can be applied when studying impacts of tank trucks because it made the analysis easier by reducing the number of factors to be considered and at the same time produced satisfactory results using scaling prototypes.
Rare-earth doped glasses and light managing in solar cells
Authors: Righini G.C. , Enrichi F. , Zur L. , Ferrari M.
Published: June 2019

Glasses doped with rare earth elements possess unique photoluminescence properties. They find application in several devices, such as lasers, optical amplifiers, and sensors. More recently, rare-earth doped glass thin films have been the subject of investigation for the development of frequency-converting layers able to increase the efficiency of silicon solar cells. Another approach to the improvement of the performance of a solar cell is based on the capture of a larger flux of light by the detector, which can be obtained by surface texture, plasmonics, or waveguide structures. Here, the recent advances in this area will be briefly reviewed.
Maximum power for a power plant with n Carnot-like cycles
Authors: Aragón-González G , Barragán-Santiago I , Cano-Blanco M , León-Galicia A
Published: June 2019

A stationary power plant with n Carnot-like cycles is optimized. Each cycle has the following irreversibilities: finite rate heat transfers between the working fluid and the external heat sources, internal dissipation of the working fluid, and heat leak between reservoirs. In a previous work, a plant with two cycles of this type was optimized, with respect to the isentropic temperature ratio, applying the optimal allocation or effectiveness of the heat exchangers for the power plant by two design rules, alternatively: fixed internal thermal conductance or fixed areas. Also, in an above work the optimal allocation or effectiveness of the heat exchangers were extended to a power plant with n Carnot-like cycles. In this work, these optimal relations obtained are substituted in the power and the maximum power is calculated, with respect to the isentropic temperature ratios corresponding to each one of the Carnot-like cycles of the power plant with n Carnot-like cycles. Also, the efficiency to maximum power for both design rules is presented.
Analysis of the Performance in the Process of Solar Still using Textile Wastewater
Authors: Chávez S , Terres H , Lizardi A , López R , Monzalve R
Published: June 2019

In this work an analysis is realized on the performance of a solar distiller using textile wastewater from fiber dyeing processes. A solar still with shed was used, where 6 experimental tests were performed using Black B5, Blue 198 and Red 81, with and without auxiliary, for each test. Temperatures were measured on the cover of glass, container absorbent, fluid and environment. The incident solar radiation was obtained by means of modules ADAM and a pyranometer. The processing of the acquired information was done by means of the software LabVieW. An energy balance was established and the Dunkle’s thermal model was used to evaluate the thermal behavior of the solar distillation. The following values were o maximum values of 37.4 %, 25 % and 21.4 % for Black B5, Blue 198 and Red 81 without auxiliary respectively and 45.4 %, 34 % and 26.7 % for Black B5, Blue 198 and Red 81 with auxiliary respectively, in such a way that the efficiency increases when the textile wastewater contained auxiliary.
Precision Glass Molded Lenses Analysis via Null-Screen Test
Authors: Aguirre-Aguirre D , Díaz-Uribe R , Campos-García M , Villalobos-Mendoza B
Published: June 2019

This work shows a method to recover the shape of the precision glass molding surface via null-screen test. For the validation of the proposed method, we analyzed the ACL25416U condenser lens fabricated by Thorlabs. The results show that the conic constant, the radius of curvature and the aspheric deformation coefficients can be retrieved with good accuracy.
Numerical modelling of mechanical contact between dissimilar materials
Authors: Hernández-Mora L J , De la Vega Ibarra L A , Urriolagoitia-Sosa G , Romero-Ángeles B , Urriolagoitia-Calderón G M
Published: June 2019

Since the beginning of the last century, the mechanical contact has been studied by many researchers who could find some relations between the contact area and other factors like contact load. One of these researchers was Hertz whose investigations about mechanical contact between cylindrical solid bodies has been used since that time. It is well known that the most real results are results of experimental tests. However, in this case, the experimental tests have some inconvenients to be solved, one of these, is the incapability of determine the contact area or the contact pressure distribution. Some investigators have employed different devices in order to solve the problems mentioned before. Since the 2000 year some researchers have employed softwares with Finite Element Method, this method has shown to be a practical tool in the understanding of behaviour of the bodies under contact conditions. In this work the authors present analytical and numerical results of two bodies in contact. This contact involves two main parameters, one is the geometry of the bodies and the other is the composition of them. The results show a very good correspondence between the numerical and analytical results.
Multifractal Decompositions using Iterated Function Systems
Authors: del Río-Correa J L , López García J , Durán Meza G
Published: June 2019

We analyze two types of multifractal decompositions (MD) of fractals F generated by an Iterated Function System (IFS), they are the geometric and the statistical MD, the first is generated by an IFS and the second by an IFS with probability. In the first, F is decomposed in subsets M(φ) of points characterized by the same vector frequency φ, and we evaluate their Hausdorff dimension (HD). In the second, F is decomposed in subsets Jα of points with the same pointwise dimension α; however Jα is composed by an infinite subsets M(φ), therefore Jα is a multifractal, this implies that its HD is the maximum HD of its components M(φ), using a maximizing procedure we find φ∗ such that HD of M(φ∗) is greater than any other M(φ) for a fixed α, this procedure gives in a natural form the auxiliary functions proposed by Cawlin and Mauldin. Thus we present a more simple description of the MD.
Thermo-hydraulic analysis of the condenser (helically-coiled type) of an air-water heat pump, using CFD numerical simulation
Authors: López R , Vaca M , Terres H , Lizardi A , Chávez S , Rocha O , Meza E.
Published: June 2019

This paper presents the results obtained from the modeling of the flow and heat transfer in the condenser of the heat pump used for heating the water of a pool, by means of CFD analysis. Using the k-∈ turbulence model its real behavior was described; these data may be useful to propose the improvement of its thermal design. The distributions of temperature, pressure, and velocity, both for the water and the R-410A refrigerant were obtained. The value of the COP of the pump which was 7.6 was found through the results. The experimental value of this variable was 7.32, both values are lower than those offered by the manufacturer of this equipment.
Pressure wave equation far from thermodynamics equilibrium
Authors: Granados S. J. , Salazar M. J. , Toral R. A. , Tavera R. F. , Velázquez A. J.M. , Hernández L. R.T. , Cid R. A. , López G.G. , González R.A.
Published: June 2019

With the aim to model the propagation of sound pressure emitted by a source, based on the postulates of Far from equilibrium thermodynamics theory, a wave equation was constructed. The equation obtained is a classic generalized wave equation adding dissipative behavior as a function of the media in which wave propagates. The new equation is of Maxwell-Cattaneo-Vernotte type. Also, an experimental activity was realized and the results were in accordance with theoretical solution of the new differential equation.
ECG Classification Using Artificial Neural Networks
Authors: Rivera Sánchez F A , González Cervera J A
Published: June 2019

We propose two Artificial Neural Networks (ANN) architectures for classification of electrocardiogram (ECG) signals to compare effectiveness between them. The atrial fibrillation (AF) classification data set provided by PhysioNet/CinC Challenge 2017 was used. The ANNs proposed are a feed forward neural network (FFNN) and a convolutional neural network (CNN). In order to train the convolutional neural network we transformed the ECG signals to images. The convolutional neural network overcomes the other by reaching an average accuracy of 97.6% in prediction set.