bluuebunny/crossref_metadata_2025 huggingface dataset:
Brain activity changes in a macaque model of oxaliplatin-induced neuropathic cold hypersensitivity
Authors: Nagasaka Kazuaki , Yamanaka Kazunori , Ogawa Shinya , Takamatsu Hiroyuki , Higo Noriyuki
Published: June 2017

The antineoplastic agent oxaliplatin induces a painful peripheral neuropathy characterized by an acute cold hypersensitivity. There is a lack of effective treatments to manage oxaliplatin-induced cold hypersensitivity which is due, in part, to a lack of understanding of the pathophysiology of oxaliplatin-induced cold hypersensitivity. Thus, brain activity in oxaliplatin-treated macaques was examined using functional magnetic resonance imaging (fMRI). Oxaliplatin treatment reduced tail withdrawal latency to a cold (10 °C) stimulus, indicating cold hypersensitivity and increased activation in the secondary somatosensory cortex (SII) and the anterior insular cortex (Ins) was observed. By contrast, no activation was observed in these areas following cold stimulation in untreated macaques. Systemic treatment with an antinociceptive dose of the serotonergic-noradrenergic reuptake inhibitor duloxetine decreased SII and Ins activity. Pharmacological inactivation of SII and Ins activity by microinjection of the GABAA receptor agonist muscimol increased tail withdrawal latency. The current findings indicate that SII/Ins activity is a potential mediator of oxaliplatin-induced cold hypersensitivity.
Facile detection of glucose in human serum employing silver-ion-guided surface-enhanced Raman spectroscopy signal amplification
Authors: Fu Cuicui , Jin Sila , Oh Joohee , Xu Shuping , Jung Young Mee
Published: June 2017

Schematic of facile detection of glucose in human serum employing silver-ion-guided surface-enhanced Raman spectroscopy signal amplification.
Thermal decomposition pathways of nitro-functionalized metal–organic frameworks
Authors: McDonald Kyle A. , Ko Nakeun , Noh Kyungkyou , Bennion Jonathan C. , Kim Jaheon , Matzger Adam J.
Published: June 2017

Nitrated metal–organic frameworks transform into carbon structures with highly dispersed metal through a deflagration process involving extremely anisotropic reaction propagation.
Chiral N,N′-dioxide/Co(ii)-promoted asymmetric 1,3-dipolar cycloaddition of nitrones with methyleneindolinones
Authors: Zhang Dong , Yin Chengkai , Zhou Yuhang , Xu Yali , Lin Lili , Liu Xiaohua , Feng Xiaoming
Published: June 2017

A chiral N,N′-dioxide/Co(ii) complex has been developed to efficiently catalyze the asymmetric 1,3-dipolar cycloaddition of nitrones with methyleneindolinones. The corresponding spiroisoxazolidines were obtained in high yields with excellent dr and ee values.
Dissipation of self-assemblies by fusion of complementary gels: an elegant strategy for programmed enzymatic reactions
Authors: Mandal Deep , Choudhury Pritam , Sarkar Deblina , Das Prasanta Kumar
Published: June 2017

Cholesterol based phenylboronic acid and glucose tailored complementary gels underwent mutual self-destruction upon mixing, which was employed in a programmed enzymatic reaction.
Cation solvation with quantum chemical effects modeled by a size-consistent multi-partitioning quantum mechanics/molecular mechanics method
Authors: Watanabe Hiroshi C. , Kubillus Maximilian , Kubař Tomáš , Stach Robert , Mizaikoff Boris , Ishikita Hiroshi
Published: June 2017

In the condensed phase, quantum chemical properties such as many-body effects and intermolecular charge fluctuations are critical determinants of the solvation structure and dynamics.
Coherent intermolecular proton transfer in the acid–base reaction of excited state pyranine
Authors: Heo Wooseok , Uddin Nizam , Park Jae Woo , Rhee Young Min , Choi Cheol Ho , Joo Taiha
Published: June 2017

The acidic proton in pyranine is transferred coherently to acetate through the stretching motion of the whole molecule.
Controlling the kinetic and thermodynamic stability of cationic clusters by the addition of molecules or counterions
Authors: Strate Anne , Niemann Thomas , Ludwig Ralf
Published: June 2017

We discuss the stability of cationic clusters when adding molecules or counterions, and predict their occurrence in gas phase experiments.
Water–chromophore electron transfer determines the photochemistry of cytosine and cytidine
Authors: Szabla Rafał , Kruse Holger , Šponer Jiří , Góra Robert W.
Published: June 2017

Irradiation of aqueous cytidine may result in a water–chromophore electron transfer process which explains numerous experimental observations, including photodamage.
Photodissociation of CH3CHO at 248 nm: identification of the channels of roaming, triple fragmentation and the transition state
Authors: Han Yong-Chang , Tsai Po-Yu , Bowman Joel M. , Lin King-Chuen
Published: June 2017

The issue of photodissociation dynamics of CH3CHO at 248 nm has been clarified with the aid of the theoretical evidence.
Modeling cooperative effects in halogen-bonded infinite linear chains
Authors: Adasme-Carreño Francisco , Alzate-Morales Jans , Ireta Joel
Published: June 2017

It is shown that the nature of halogen bonds in cyanogen halides and 4-halopyridines differs, still cooperativity in both systems results from interacting point-dipoles.
The water dimer reaction OH + (H2O)2 → (H2O)–OH + H2O
Authors: Gao Aifang , Li Guoliang , Peng Bin , Xie Yaoming , Schaefer Henry F.
Published: June 2017

The stationary points, including the entrance complex, transition states, and the exit complex, for the reaction OH + (H2O)2 → (H2O)OH + H2O have been carefully examined using the “gold standard” CCSD(T) method with the correlation-consistent basis sets up to cc-pVQZ.
Exploring the impact of the side-chain length on peptide/RNA binding events
Authors: Sbicca Lola , González Alejandro López , Gresika Alexandra , Di Giorgio Audrey , Closa Jordi Teixido , Tejedor Roger Estrada , Andréola Marie-Line , Azoulay Stéphane , Patino Nadia
Published: June 2017

The impact of the amino-acid side-chain length on peptide–RNA binding events has been investigated using HIV-1 Tat derived peptides as ligands and the HIV-1 TAR RNA element as an RNA model.
Heterogeneous catalytic hydrogenation of CO2by metal oxides: defect engineering – perfecting imperfection
Authors: Jia Jia , Qian Chenxi , Dong Yuchan , Li Young Feng , Wang Hong , Ghoussoub Mireille , Butler Keith T. , Walsh Aron , Ozin Geoffrey A.
Published: June 2017

In this review, we discuss how metal oxides with designed defects can be synthesized and engineered, to enable heterogeneous catalytic hydrogenation of gaseous carbon dioxide to chemicals and fuels.
Simple synthesis of ultrasmall β-Mo2C and α-MoC1−x nanoparticles and new insights into their catalytic mechanisms for dry reforming of methane
Authors: Liang Pengliang , Gao Haifeng , Yao Zhiwei , Jia Renren , Shi Yan , Sun Yue , Fan Qi , Wang Haiyan
Published: June 2017

Ultrasmall β- and α-molybdenum carbide particles were synthesized by a resin route and they showed different oxidation–recarburization cycles.
Tunable white light of a Ce3+,Tb3+,Mn2+ triply doped Na2Ca3Si2O8 phosphor for high colour-rendering white LED applications: tunable luminescence and energy transfer
Authors: Lü Wei , Xu Huawei , Huo Jiansheng , Shao Baiqi , Feng Yang , Zhao Shuang , You Hongpeng
Published: June 2017

We report a full-color emitting Na2Ca3Si2O8:Ce3+,Tb3+,Mn2+ phosphor with a high color rendering index for UV white LEDs.
Interconnected hierarchical NiCo2O4 microspheres as high-performance electrode materials for supercapacitors
Authors: Cheng Ming , Fan Hongsheng , Song Yuanjun , Cui Yimin , Wang Rongming
Published: June 2017

Hierarchical NiCo2O4 microspheres with large tunnels and abundant mesopores have been prepared, and they exhibit excellent performance in supercapacitor applications.
Electron-deficient trifluoromethyl-substituted sub-components affect the properties of M4L4 tetrahedral cages
Authors: Struch N. , Topić F. , Rissanen K. , Lützen A.
Published: June 2017

Two supramolecular cages based on a trifluoromethyl-substituted pyridylimine ligand have been synthesised where the iron(ii) complex shows host–guest chemistry and complex-to-complex transformations.
Chromatographic and mass spectrometry analysis of wheat flour prolamins, the causative compounds of celiac disease
Authors: Perez-Gregorio M. R. , Días R. , Mateus N. , de Freitas V.
Published: June 2017

Immunogenic gluten peptides trigger Celiac Disease (CD), an adaptive immune response in genetically predisposed individuals.
Importance of C–H⋯π interactions in stabilizing the syn/anti arrangement of pendant alkoxy side arms in two manganese(iv) Schiff base complexes: exploration of catechol oxidase and phenoxazinone synthase like activities
Authors: Sarkar Nandita , Harms Klaus , Frontera Antonio , Chattopadhyay Shouvik
Published: June 2017

Two manganese(iv) complexes have been prepared and characterized. Both complexes exhibit catechol oxidase and phenoxazinone synthase like activities.
Microwave synthesis of bis(cycloalkeno)-1,4-diselenins: a novel source of Se for CdSe QDs
Authors: Jadhav Aditi A. , More Priyesh V. , Khanna Pawan K.
Published: June 2017

This paper describes the formation of a series of bis(cycloalkeno)-1,4-diselenins from the corresponding cycloalkeno-1,2,3-selenadiazoles by a microwave irradiation method. Additionally, for the first time ever, bis(cyclohepteno)-1,4-diselenin has been utilised as a novel selenium precursor for the preparation of CdSe quantum dots (QDs) by a microwave method.
Capillary electrophoretic separation of cis/trans isomers of bis(o-diiminobenzoquinonato)platinum(ii) complexes using β-cyclodextrins as the selector
Authors: Masuya-Suzuki Atsuko , Hayashi Takumi , Tamura Kosaku , Iki Nobuhiko
Published: June 2017

Capillary electrophoresis was employed to successfully resolve the cis/trans isomers of PtII-diradical complexes using β-cyclodextrins as the selector, allowing for the estimation of the inclusion constant and the representation of the inclusion complex through mobility.
Preparation of diethylenetriamine-modified magnetic chitosan nanoparticles for adsorption of rare-earth metal ions
Authors: Liu Enli , Zheng Xudong , Xu Xuechao , Zhang Fusheng , Liu Enxiu , Wang Yuanyuan , Li Chunxiang , Yan Yongsheng
Published: June 2017

The development of a sustainable method to conveniently separate rare-earth metal ions remains a challenge waiting for breakthrough in numerous of advanced technologies.
Defined functionality and increased luminescence of nanodiamonds for sensing and diagnostic applications by targeted high temperature reactions and electron beam irradiation
Authors: Laube Ch. , Riyad Y. M. , Lotnyk A. , Lohmann F. P. , Kranert C. , Hermann R. , Knolle W. , Oeckinghaus Th. , Reuter R. , Denisenko A. , Kahnt A. , Abel B.
Published: June 2017

Highly reproducible functionalized and bright nanodiamonds for sensing and diagnostic applications by high temperature reactions and electron beam irradiation.
Toward multifunctional hybrid platforms for tissue engineering based on chitosan(PEO) nanofibers functionalized by bare laser-synthesized Au and Si nanoparticles
Authors: Al-Kattan Ahmed , Nirwan Viraj P. , Munnier Emilie , Chourpa Igor , Fahmi Amir , Kabashin Andrei V.
Published: June 2017

Exhibiting a variety of unique optical, structural and physicochemical properties, laser-synthesized nanomaterials have become increasingly popular during recent years in a variety of biomedical, catalytic, photovoltaic and other applications.
Synthesis and mechanism study of gelatin grafted acetone formaldehyde sulphonates as oil-well cement dispersant
Authors: Wang Chengwen , Meng Renzhou , Wang Ruihe , Shen Zhonghou
Published: June 2017

A novel dispersant, gelatin grafted acetone formaldehyde sulphonates (GAFS), was synthesized for oil-well cement.
Improved electrochemical performance of LiFe0.4Mn0.6PO4/C with Cr3+ doping
Authors: Xiao Peng , Cai Yuanyuan , Chen Xueping , Sheng Zhaomin , Chang Chengkang
Published: June 2017

LiFe0.4Mn0.6−xCrxPO4/C (x ≤ 0.01) cathode materials with different Cr-doping were synthesized by a nano-milling assisted solid-state method.
Electrochemical formation and thermodynamic properties of Tb–Bi intermetallic compounds in eutectic LiCl–KCl
Authors: Han Wei , Ji Nan , Wang Ji , Li Mei , Yang Xiaoguang , Sun Yang , Zhang Milin
Published: June 2017

The electrochemical formation and thermodynamic properties of Tb–Bi intermetallic compounds were investigated on a Bi film electrode in eutectic LiCl–KCl.
A polysalen based on polyacylamide stabilized palladium nanoparticle catalyst for efficient carbonylative Sonogashira reaction in aqueous media
Authors: Wang Yan , Yang Xiaolong , Yu Jianqiang
Published: June 2017

Pd nanoparticles immobilized on polysalen based on polyacylamide was synthesized and used for carbonylative Sonogashira coupling of aryl iodides with terminal alkynes to produce α,β-alkynyl ketones in aqueous media.
One-minute self-assembly of millimetre-long DAST crystalline microbelts via substrate-supported rapid evaporation crystallization
Authors: Tian Tian , Cai Bin , Ye Tianming , Cheng QingQing , Zhan Peng , Xu Gongjie , Zhang Ling , Sugihara Okihiro
Published: June 2017

We propose a substrate-supported rapid evaporation crystallization method to rapidly self-assemble microbelts of DAST, a benchmark organic NLO crystal. DAST microbelt formation depends on substrate properties and surfactant.
Ultra-high electrocatalytic activity of VS2 nanoflowers for efficient hydrogen evolution reaction
Authors: Qu Yuanju , Shao Mengmeng , Shao Yangfan , Yang Mingyang , Xu Jincheng , Kwok Chi Tat , Shi Xingqiang , Lu Zhouguang , Pan Hui
Published: June 2017

It is a great challenge to explore cheap, abundant and eco-friendly electrocatalysts for hydrogen evolution reaction (HER).
Enhanced long-term stability of perovskite solar cells using a double-layer hole transport material
Authors: Li Qi , Zhao Yicheng , Fu Rui , Zhou Wenke , Zhao Yao , Lin Fang , Liu Song , Yu Dapeng , Zhao Qing
Published: June 2017

Using a double-layer hole transport material configuration, perovskite solar cells sustain over 90% of their initial output after 10 h of steady-state measurement.
Hierarchical NiCoP nanocone arrays supported on Ni foam as an efficient and stable bifunctional electrocatalyst for overall water splitting
Authors: Li Junzhi , Wei Guodong , Zhu Yukun , Xi Yunlong , Pan Xuexue , Ji Yuan , Zatovsky Igor. V. , Han Wei
Published: June 2017

NiCoP cone-shaped nanowire arrays as an efficient and stable bifunctional electrocatalyst for overall water splitting.
Polymer cloaking modulates the carbon nanotube protein corona and delivery into cancer cells
Authors: Budhathoki-Uprety Januka , Harvey Jackson D. , Isaac Elizabeth , Williams Ryan M. , Galassi Thomas V. , Langenbacher Rachel E. , Heller Daniel A.
Published: June 2017

Polycarbodiimide cloaking of photoluminescent single-walled carbon nanotubes modulates their surface chemistry, protein corona, and uptake in cancer cells.
A Pilot Study on Professional Documentation: Do We Write From a Strengths Perspective?
Authors: Braun Matthew J. , Dunn Winnie , Tomchek Scott D.
Published: June 2017

Purpose

There is growing evidence supporting the use of strengths-based practices when serving families. The purpose of this study was to examine the use of strengths-based approaches in the context of written professional documentation. We specifically explored whether or not interdisciplinary clinicians in one university-based medical center clinic write from a strengths perspective (e.g., writing focuses on abilities rather than on deficits) when documenting child behavior in autism diagnostic clinics.

Method

We gathered narrative-based writing samples (a total of 299 phrases) from 20 patient reports. Using a coding system developed by the research team (intraclass correlation coefficient = .801 on final definitions and coding system), we analyzed the extent to which interdisciplinary clinicians included strengths-based language (e.g., language that emphasizes a person's strengths rather than limitations) in their written documentation. An independent researcher coded a random sample (20% of entire sample) of the data to document reliability of the coded data (97% interrater agreement).

Results

Our findings indicated that clinicians in our study used deficit-based language significantly more than neutral and strengths-based language in written documentation.

Conclusion

This preliminary evidence suggests a need to reflect upon our own understanding of strengths-based practices and the way professionals write about children in clinical documentation.
Improved singular value decomposition‐based de‐noising algorithm in digital receiver front‐end
Authors: Hu Lin , Ma Hong , Zhang Hua , Zhao Wen
Published: June 2017

It is commonly acknowledged that most of the output signals of digital receiver front‐end are noisy and cannot be directly delivered to post‐processing subject to the working condition and the limitations of devices. This study presents an improved singular value decomposition‐based de‐noising algorithm by the adoption of time‐domain constrained optimisation. The improved algorithm contains a filter factor which plays a role in distributing information contributions of each retained singular value component to the de‐noised signal, according to the relative contribution of noise in each singular value. The selection methods for several critical factors of the algorithm are discussed, including the noisy matrix, de‐noising order, noise power and Lagrange multiplier. In particular, the effects of de‐noising order and Lagrange multiplier on de‐noising performance are studied. The results of the verification tests of extensive simulations and actual measurements from receiver front‐end show that the proposed algorithm can significantly reduce the background noise and guarantee the integrity of the information contained in the de‐noised signal.
Reputation‐aware incentive mechanism for participatory sensing
Authors: Sun Jingyi , Pei Yingying , Hou Fen , Ma Shaodan
Published: June 2017

The authors take the quality of sensing data into consideration and design a reputation‐aware incentive mechanism (RAIM) with the properties of truthfulness and individual rationality while maximising the weighted social welfare of the whole system. In addition, in order to reduce the computational complexity of RAIM and improve the system feasibility, the authors propose a heuristic algorithm RAIM‐H, with the computational complexity of . Simulation results show the nice performance of the proposed mechanisms RAIM and RAIM‐H in terms of the weighted social welfare and the average reputation. Specifically, RAIM can improve the weighted social welfare by 8.65 and 48.16% compared with trustworthy sensing for crowd management (TSCM) and random selection, respectively, with the number of smartphone users . Meanwhile, RAIM‐H approaches to the maximum very well and can improve the weighted social welfare by 6.15% and 75% compared with TSCM and random selection, respectively, with the number of smartphone users .
Network coding‐based multi‐path routing algorithm in two‐layered satellite networks
Authors: Xu Wenchao , Jiang Meng , Tang Feilong , Yang Yanqin
Published: June 2017

Satellite networks are capable of contenting a variety of data transmission needs of users in geographically diverse locations throughout the world. Multi‐layered satellite networks (MLSNs) can construct efficient communications networks due to their extensive coverage and high network capacity. However, throughput degradation and severe end‐to‐end delay could occur in MLSNs because of the traffic congestion. To resolve these problems, the authors first propose a novel MEO/LEO satellite network architecture that construct effective inter‐satellite links. Then the authors present a network coding‐based multi‐path routing algorithm to deliver traffic through the hybrid satellite network. The analysis of characteristics of the proposed scheme are addressed by performance evaluations in simulation.
Optimal access mode selection and resource allocation for cellular‐VANET heterogeneous networks
Authors: Qi Yanjia , Wang Hongyu , Zhang Lingyan , Wang Bing
Published: June 2017

In recent years, the vehicular ad‐hoc networks (VANETs) have attracted plenty of attention. However, VANETs can hardly meet surging demands of mobile data. Device‐to‐device (D2D) communication is regarded as a promising method for providing the reliable connectivity between vehicles. The heterogeneous networks including conventional cellular network and VANETs, where the cellular links and the D2D‐based vehicle‐to‐vehicle communication links coexist by reusing the same spectrum resources, result in a more complicated interference scenario. Thus the access mode switch and resource allocation between cellular and VANETs becomes a challenging issue. In this study, the authors formulate an optimal access mode selection and resource allocation scheme as a user aggregate utility maximisation problem with the joint consideration of various network topologies, transmission delay and power reduction. To reduce the high computation complexity, they provide a distributed algorithm that converges to a near‐optimal solution via augmented Lagrangian technique. Numerical results show that remarkable throughput gains are achieved relative to the existing work, especially for large‐scale networks. The network throughput can be considerably improved as well due to power reduction.
On delay‐dependent algebraic Riccati equation
Authors: Tan Cheng , Wong Wing Shing , Zhang Huanshui
Published: June 2017

This study presents a study on delay‐dependent algebraic Riccati equations (DAREs) derived from linear quadratic optimisation and stabilisation problems of networked control systems (NCSs) that endure both transmission delay and packet dropout. By applying the operator spectrum theory, two sets of fundamental results are obtained for such DARE: first, it is shown that the stabilising solution to a DARE, if it exists, is unique and coincides with a maximal solution. Moreover, under the assumption of detectability or observability, it is shown that the unique stabilising solution exists if and only if the associated NCS is stabilisable. Second, an iterative algorithm for computing the stabilising solution is proposed. The proof of convergence of the algorithm is presented. To confirm the validity of our theoretic results, two illustrative examples are included in this study. One of the example is motivated by a pursuit–evasion problem.
Estimation of zero sequence parameters of mutually coupled transmission lines from synchrophasor measurements
Authors: Dasgupta Kalyan , Soman Shreevardhan Arunchandra
Published: June 2017

The authors consider the problem of estimating zero sequence parameters of a transmission line using synchrophasor data. When a set of three‐phase transmission lines share, partial or complete, right of way, then their zero sequence models exhibit mutual coupling. As such the zero sequence parameters cannot be estimated by linear least squares or total least squares (TLS) technique which are the preferred methods when dealing with the positive sequence line parameter estimation problem. Further, method design has to factor the constraint of a sparse data set when dealing with zero sequence phasors. Therefore, the authors propose orthogonal distance regression approach for solving the zero sequence parameter estimation problem. This generalises the method of TLS to the non‐linear parameter estimation problem considering noise in both the voltage and current synchrophasor measurements. Extensive case studies and comparative evaluations are presented to demonstrate the efficacy of the proposed approach.
Non‐fragile reliable control synthesis of the sugarcane borer
Authors: Sakthivel Rathinasamy , Saravanakumar Thangavel , Sathishkumar Murugesan
Published: June 2017

This study considers the problem of non‐fragile reliable control synthesis for mathematical model of interaction between the sugarcane borer (Diatraea saccharalis) and its egg parasitoid Trichogramma galloi. In particular, the control could be substituted by periodic releases of a small population of natural enemies and hence it is important to propose the time‐varying controller in sugarcane borer. The main aim of this study is to design a state feedback non‐fragile (time‐varying) reliable controller such that the states of the sugarcane borer system reach the equilibrium point within the desired period. A novel approach is proposed to deal with the uncertain matrices which appear in non‐fragile reliable control. Finally, simulations based on sugarcane borer systems are conducted to illustrate the advantages and effectiveness of the proposed design technique. The result reveals that the proposed non‐fragile control provides good performance in spite of periodic releases of a small population of natural enemies occurs.
Sodium carbonate‐assisted formation of hollow cadmium molybdate microspheres
Authors: Chen Qingchun , Deng Huiyu
Published: June 2017

Hollow cadmium molybdate (CdMoO4) microspheres with an average diameter of ∼1000 nm have been successfully synthesised via a Na2CO3‐assisted solution synthesis method without using any other surfactants or additives. X‐ray diffraction pattern and scanning electron microscopy were used to characterise the samples. The photocatalytic property of hollow CdMoO4 microspheres to degrade dye rhodamine B under the irradiation of UV light was evaluated, which was much better than that of solid microspheres obtained through the same solution synthesis method without the assistance of Na2CO3.
A Highly Efficient Approach for the Synthesis of Novel Trifluoroacetylated Enaminones using DBU as a Base
Authors: Bhagat S. , Kumari P. , Sharma N. , Kumar A. , Mohapatra S.
Published: June 2017

An efficient methodology has been developed for the synthesis of a variety of novel trifluoroacetylated enaminones by using trifluoroacetic anhydride in DCE as solvent and DBU as a base via electrophilic trifluoroacetylation. X-ray crystallographic studies confirmed the trifluoroacetylation and E stereoisomeric form of the novel compounds. The synthetic strategy has the advantage of using an inexpensive and non-toxic base for producing excellent yields. Synthons bearing variety of functional groups may be further extended for the formation of heterocyclic compounds.
A Novel Mutation in the AVPR2 Gene in a Palestinian Family with Nephrogenic Diabetes Insipidus
Authors: Abu-Libdeh Abdulsalam , Wexler Isaiah , Dweikat Imad , Zangen David , Abu-Libdeh Bassam
Published: June 2017

Nephrogenic diabetes insipidus (NDI) is a urinary concentrating defect resulting from resistance of the collecting duct to the antidiuretic action of vasopressin (AVP). The X-linked recessive form is the most frequent genetic cause of inherited NDI and can be caused by mutations in the gene encoding the V2 vasopressin receptor (AVPR2). A Palestinian male infant presented in the neonatal period with failure to thrive, vomiting, irritability, fever, and polyuria, and had biochemical findings consistent with NDI. The diagnosis of NDI was established based on the clinical picture, absent response to desmopressin, and a similarly affected elder brother. Sequencing of the AVPR2 gene for the patient and his affected brother revealed a novel missense mutation with replacement of G by A in codon 82 located in exon 2 (TGC → TAC), causing a cysteine to tyrosine substitution (C82Y). Testing of the mother showed that she was the carrier of that mutation. This is the identified AVPR2 mutation in a Palestinian family. Knowledge of these mutations will allow genetic counseling and early diagnosis of affected males.
The potential of imposed magnetic fields for enhancing ignition probability and fusion energy yield in indirect-drive inertial confinement fusion
Authors: Perkins L. J. , Ho D. D.-M , Logan B. G. , Zimmerman G. B. , Rhodes M. A. , Strozzi D. J. , Blackfield D. T. , Hawkins S. A.
Published: June 2017

We examine the potential that imposed magnetic fields of tens of Tesla that increase to greater than 10 kT (100 MGauss) under implosion compression may relax the conditions required for ignition and propagating burn in indirect-drive inertial confinement fusion (ICF) targets. This may allow the attainment of ignition, or at least significant fusion energy yields, in presently performing ICF targets on the National Ignition Facility (NIF) that today are sub-marginal for thermonuclear burn through adverse hydrodynamic conditions at stagnation [Doeppner et al., Phys. Rev. Lett. 115, 055001 (2015)]. Results of detailed two-dimensional radiation-hydrodynamic-burn simulations applied to NIF capsule implosions with low-mode shape perturbations and residual kinetic energy loss indicate that such compressed fields may increase the probability for ignition through range reduction of fusion alpha particles, suppression of electron heat conduction, and potential stabilization of higher-mode Rayleigh-Taylor instabilities. Optimum initial applied fields are found to be around 50 T. Given that the full plasma structure at capsule stagnation may be governed by three-dimensional resistive magneto-hydrodynamics, the formation of closed magnetic field lines might further augment ignition prospects. Experiments are now required to further assess the potential of applied magnetic fields to ICF ignition and burn on NIF.
Comparative Raman scattering study of Ba3MSb2O9 (M = Zn, Co and Cu)
Authors: Glamazda A. , Lemmens P. , Do S.-H. , Choi K.-Y.
Published: June 2017

Raman spectroscopy is combined with lattice dynamic calculations to investigate the magnetic and structural properties of the 6H-perovskite compounds Ba3MSb2O9 (M = Zn, Co and Cu). Unlike the nonmagnetic Ba3ZnSb2O9 compound, the magnetic counterparts Ba3MSb2O9 (M = Co and Cu) show both lattice anomalies for temperatures below 100 K and develop highly correlated spin states below 50 K. This is ascribed to an instability of conventional magnetic excitations for the equilateral triangular antiferromagnet Ba3CoSb2O9 and a coexistence of spin-orbital liquid and random singlet state for the decorated honeycomb compound Ba3CuSb2O9 containing a nearly identical volume fraction of hexagonal and orthorhombic phases. Our results demonstrate that Ba3MSb2O9 provides a rich reservoir for hosting diverse magnetic and structural phases as a function of the metal ion M.
Electronic structure and x-ray magnetic circular dichroism in A2CrB′O6 (A = Ca, Sr; B′ = W, Re, and Os) oxides
Authors: Antonov V. N. , Bekenov L. V.
Published: June 2017

A systematic electronic structure study of A2CrB′O6 (A = Ca, Sr; B′ = W, Re, and Os) has been performed by employing the local spin-density approximation (LSDA) as well as the GGA and LSDA + U methods using the fully relativistic spin-polarized Dirac linear muffin-tin orbital band-structure method. We investigated the effects of the subtle interplay among the spin-orbit coupling, electron correlations, and lattice distortion on the electronic structure of the double perovskites. First principles calculations predict that Sr2CrOsO6 is (before considering spin-orbit coupling) actually a ferrimagnetic semimetal with precisely compensating spin moments, or spin-asymmetric compensated semimetallic ferrimagnet in which the electrons and holes are each fully polarized and have opposite spin directions, in spite of a zero net moment and hence no macroscopic magnetic field. Spin-orbit coupling degrades this by giving a nonzero total moment, but the band structure is little changed. Therefore, the observed saturation moment of ferrimagnetic Sr2CrOsO6 is entirely due to spin-orbit coupling. The x-ray absorption spectra and x-ray magnetic circular dichroism at the W, Re, Os, and Cr L2,3, and Cr and O K edges were investigated theoretically from first principles. A qualitative explanation of the XMCD spectra shape is provided by the analysis of the corresponding selection rules, orbital character and occupation numbers of individual orbitals. The calculated results are in good agreement with experimental data. The complex fine structure of the Cr L2,3 XAS in Sr2CrWO6 and Sr2CrReO6 was found to be not compatible with a pure Cr3+ valency state. The interpretation demands mixed valent states. We found that possible oxygen vacancies lead to a mixed valency at the Cr site, double peak structure at the Cr L2,3 edges and reduce the saturation magnetization in Sr2CrWO6 and Sr2CrReO6.
Magnetism of polyanionic compounds of transition metals (Review Article)
Authors: Danilovich I. L. , Volkova O. S. , Vasiliev A. N.
Published: June 2017

The magnetic properties of 3d-transition metal polyanionic compounds differ markedly from those of the monoanionic compounds. The simplest of them can be considered as systems with structures containing cations of a single metal in the Ti–Cu series and several different anions (F−, Cl−, Br−, (OH)−, O2−). Metal orbitals overlap differently with orbitals of the halogen, hydroxyl groups and oxygen causing a wide spread in competition among the different exchange interactions in polyanionic compounds. At the same time, exchange with other cations, including non-transition metals, does not occur in these compounds. The physics of polyanionic magnets remains largely unexplored, since such systems are usually chemically active and require particular care when physical measurements are made.
Features of low-temperature tunneling magnetoresistance of pressed chromium dioxide CrO2 nanopowders
Authors: Kolesnichenko Yu. A. , Dalakova N. V. , Beliayev E. Yu. , Bludov O. M. , Horielyi V. A. , Osmolowskaya O. M. , Osmolowsky M. G.
Published: June 2017

A study of the resistive and low-temperature magnetoresistive properties of pressed powders of ferromagnetic half-metal chromium dioxide CrO2 with nanoparticle shape anisotropy. The effects of Fe impurities on the tunneling resistance and magnetoresistance of CrO2 powders are investigated. It is found that the Fe impurity leads to a decrease in the resistance and tunneling magnetoresistance of chromium dioxide. It is suggested that the decrease in magnetoresistance of the solid solution Cr1-xFexO2 is associated with the formation of additional localized states at the iron impurities in a tunnel barrier. The influence of the magnetic field input rate on the form of the low-temperature tunneling magnetoresistance hysteresis in Cr1-xFexO2 powder is considered. It is shown that the low-temperature singularities of magnetoresistance hysteresis depend on the relaxation rate of the magnetic moments of the nanoparticles to the equilibrium state. Possible reasons for such a dependence are discussed.
Modelling compressible dense and dilute two-phase flows
Authors: Saurel Richard , Chinnayya Ashwin , Carmouze Quentin
Published: June 2017

Many two-phase flow situations, from engineering science to astrophysics, deal with transition from dense (high concentration of the condensed phase) to dilute concentration (low concentration of the same phase), covering the entire range of volume fractions. Some models are now well accepted at the two limits, but none are able to cover accurately the entire range, in particular regarding waves propagation. In the present work, an alternative to the Baer and Nunziato (BN) model [Baer, M. R. and Nunziato, J. W., “A two-phase mixture theory for the deflagration-to-detonation transition (DDT) in reactive granular materials,” Int. J. Multiphase Flow 12(6), 861 (1986)], initially designed for dense flows, is built. The corresponding model is hyperbolic and thermodynamically consistent. Contrarily to the BN model that involves 6 wave speeds, the new formulation involves 4 waves only, in agreement with the Marble model [Marble, F. E., “Dynamics of a gas containing small solid particles,” Combustion and Propulsion (5th AGARD Colloquium) (Pergamon Press, 1963), Vol. 175] based on pressureless Euler equations for the dispersed phase, a well-accepted model for low particle volume concentrations. In the new model, the presence of pressure in the momentum equation of the particles and consideration of volume fractions in the two phases render the model valid for large particle concentrations. A symmetric version of the new model is derived as well for liquids containing gas bubbles. This model version involves 4 characteristic wave speeds as well, but with different velocities. Last, the two sub-models with 4 waves are combined in a unique formulation, valid for the full range of volume fractions. It involves the same 6 wave speeds as the BN model, but at a given point of space, 4 waves only emerge, depending on the local volume fractions. The non-linear pressure waves propagate only in the phase with dominant volume fraction. The new model is tested numerically on various test problems ranging from separated phases in a shock tube to shock–particle cloud interaction. Its predictions are compared to BN and Marble models as well as against experimental data showing clear improvements.
Nonlinear processes generated by supercritical tidal flow in shallow straits
Authors: Bordois Lucie , Auclair Francis , Paci Alexandre , Dossmann Yvan , Nguyen Cyril
Published: June 2017

Numerical experiments have been carried out using a nonhydrostatic and non-Boussinesq regional oceanic circulation model to investigate the nonlinear processes generated by supercritical tidal flow in shallow straits. Our approach relies on idealized direct numerical simulations inspired by oceanic observations. By analyzing a large set of simulations, a regime diagram is proposed for the nonlinear processes generated in the lee of these straits. The results show that the topography shape of the strait plays a crucial role in the formation of internal solitary waves (ISWs) and in the occurrence of local breaking events. Both of these nonlinear processes are important turbulence producing phenomena. The topographic control, observed in mode 1 ISW formation in previous studies [Y. Dossmann, F. Auclair, and A. Paci, “Topographically induced internal solitary waves in a pycnocline: Primary generation and topographic control,” Phys. Fluids 25, 066601 (2013) and Y. Dossmann et al., “Topographically induced internal solitary waves in a pycnocline: Ultrasonic probes and stereo-correlation measurements,” Phys. Fluids 26, 056601 (2014)], is clearly reproducible for mode-2 ISW above shallow straits. Strong plunging breaking events are observed above “narrow” straits (straits with a width less than mode 1 wavelength) when the fluid velocity exceeds the local mode 1 wave speed. These results are a step towards future works on vertical mixing quantification and localization around complex strait areas.
Doping as a means to probe the potential dependence of dopamine adsorption on carbon-based surfaces: A first-principles study
Authors: Aarva Anja , Laurila Tomi , Caro Miguel A.
Published: June 2017

In this work, we study the adsorption characteristics of dopamine (DA), ascorbic acid (AA), and dopaminequinone (DAox) on carbonaceous electrodes. Our goal is to obtain a better understanding of the adsorption behavior of these analytes in order to promote the development of new carbon-based electrode materials for sensitive and selective detection of dopamine in vivo. Here we employ density functional theory-based simulations to reach a level of detail that cannot be achieved experimentally. To get a broader understanding of carbonaceous surfaces with different morphological characteristics, we compare three materials: graphene, diamond, and amorphous carbon (a-C). Effects of solvation on adsorption characteristics are taken into account via a continuum solvent model. Potential changes that take place during electrochemical measurements, such as cyclic voltammetry, can also alter the adsorption behavior. In this study, we have utilized doping as an indirect method to simulate these changes by shifting the work function of the electrode material. We demonstrate that sp2- and sp3-rich materials, as well as a-C, respond markedly different to doping. Also the adsorption behavior of the molecules studied here differs depending on the surface material and the change in the surface potential. In all cases, adsorption is spontaneous, but covalent bonding is not detected in vacuum. The aqueous medium has a large effect on the adsorption behavior of DAox, which reaches its highest adsorption energy on diamond when the potential is shifted to more negative values. In all cases, inclusion of the solvent enhances the charge transfer between the slab and DAox. Largest differences in adsorption energy between DA and AA are obtained on graphene. Gaining better understanding of the behavior of the different forms of carbon when used as electrode materials provides a means to rationalize the observed complex phenomena taking place at the electrodes during electrochemical oxidation/reduction of these biomolecules.
Structure dependent negative and positive magnetoresistance of amorphous carbon films
Authors: Saleemi Awais Siddique , Sun Wen , Singh Rajan , Luo Zhaochu , Zhang Xiaozhong
Published: June 2017

Amorphous carbon thin films with a negative magnetoresistance (MR) of 13% and a positive MR of 31% at 2 K under a magnetic field of 7 T were fabricated through chemical vapor deposition (CVD) and pulsed laser deposition (PLD), respectively. Graphitic like carbon and amorphous structures of the thin films were observed by high-resolution transmission electron microscopy and X-ray diffraction. The MR decreases rapidly with the increase in temperature and vanishes after 40 K for the PLD grown sample, whereas for the CVD grown sample, the MR is observed up to 300 K. The negative MR may be due to the ordered graphitic like structures and its mechanism is explained by the weak localization theory for a lower temperature range of 2–50 K and the grain boundary scattering model for a higher temperature range of 50–300 K, whereas the positive MR may be due to its disordered amorphous structure and its mechanism is explained by the Efros-Shklovskii-type variable range hopping model.
Exploiting nonlinearities of micro-machined resonators for filtering applications
Authors: Ilyas S. , Chappanda K. N. , Younis M. I.
Published: June 2017

We demonstrate the exploitation of the nonlinear behavior of two electrically coupled microbeam resonators to realize a band-pass filter. More specifically, we combine their nonlinear hardening and softening responses to realize a near flat pass band filter with sharp roll-off characteristics. The device is composed of two near identical doubly clamped and electrostatically actuated microbeams made of silicon. One of the resonators is buckled via thermal loading to produce a softening frequency response. It is then further tuned to create the desired overlap with the second resonator response of hardening behavior. This overlapping improves the pass band flatness. Also, the sudden jumps due to the softening and hardening behaviors create sharp roll-off characteristics. This approach can be promising for the future generation of filters with superior characteristics.
Bubble induced flow field modulation for pool boiling enhancement over a tubular surface
Authors: Raghupathi P. A. , Joshi I. M. , Jaikumar A. , Emery T. S. , Kandlikar S. G.
Published: June 2017

We demonstrate the efficacy of using a strategically placed enhancement feature to modify the trajectory of bubbles nucleating on a horizontal tubular surface to increase both the critical heat flux (CHF) and the heat transfer coefficient (HTC). The CHF on a plain tube is shown to be triggered by a local dryout at the bottom of the tube due to vapor agglomeration. To mitigate this effect and delay CHF, the nucleating bubble trajectory is modified by incorporating a bubble diverter placed axially at the bottom of the tube. The nucleating bubble at the base of the diverter experiences a tangential evaporation momentum force (EMF) which causes the bubble to grow sideways away from the tube and avoid localized bubble patches that are responsible for CHF initiation. High speed imaging confirmed the lateral displacement of the bubbles away from the diverter closely matched with the theoretical predictions using EMF and buoyancy forces. Since the EMF is stronger at higher heat fluxes, bubble displacement increases with heat flux and results in the formation of separate liquid-vapor pathways wherein the liquid enters almost unobstructed at the bottom and the vapor bubble leaves sideways. Experimental results yielded CHF and HTC enhancements of ∼60% and ∼75%, respectively, with the diverter configuration when compared to a plain tube. This work can be used for guidance in developing enhancement strategies to effectively modulate the liquid-vapor flow around the heater surface at various locations to enhance HTC and CHF.
Measuring the carrier dynamics of photocatalyst micrograins using the Christiansen effect
Authors: Zhu Gangbei , Lu Wei , Zhu Jiangrui , Li Yunliang , Guo Liwei , Weng Yuxiang
Published: June 2017

The optical measurement of photocatalyst materials is subject to Mie scattering when the particle size is comparable to the wavelength of the probe light. A novel approach was developed to deal with this scattering problem in the transient spectroscopy of photocatalyst micrograins using the Christiansen effect because the probe light in the vicinity of the Christiansen frequency can be transmitted. Scattering theory was used to analyze the transient spectra of micrograins and estimate the extinction coefficient at the Christiansen frequency. The Drude–Lorentz model was used to calculate the complex refractive index considering the contributions from both phonons and free carriers. We found that the net photogenerated carrier density was linearly correlated with the absorbance at the Christiansen frequency. With the parameters obtained from Raman scattering measurements, the absolute net carrier density was also determined. We further demonstrated the versatility of this method by applying it to the photogenerated carrier dynamics of intrinsic 6H–SiC grains. The transient broadband mid-IR spectra were measured by the pump–probe technique, and the transient absolute net carrier density was estimated. The carrier relaxation dynamics was fitted with three components with lifetime constants that agreed well with those obtained for SiC by transient broadband THz conductivity spectroscopy. We predict that this method could be extended to other photocatalytic materials with suitable probe frequencies.
Cryogenic mount for mirror and piezoelectric actuator for an optical cavity
Authors: Oliveira A. N. , Moreira L. S. , Sacramento R. L. , Kosulic L. , Brasil V. B. , Wolff W. , Cesar C. L.
Published: June 2017

We present the development of a mount that accommodates a mirror and a piezoelectric actuator with emphasis on physical needs for low temperature operation. The design uses a monolithic construction with flexure features that allow it to steadily hold the mirror and the piezoelectric actuator without glue and accommodate differential thermal contraction. The mount is small and lightweight, adding little heat capacity and inertia. It provides a pre-loading of the piezoelectric actuator as well as a good thermal connection to the mirror and a thermal short across the piezoelectric actuator. The performance of the assemblies has been tested by thermally cycling from room temperature down to 3 K more than a dozen times and over one hundred times to 77 K, without showing any derating. Such mounts are proposed for the cryogenic optical enhancement cavities of the ALPHA experiment at CERN for laser spectroscopy of antihydrogen and for hydrogen spectroscopy in our laboratory at UFRJ.