bluuebunny/crossref_metadata_2025 huggingface dataset:
Scaphometacarpal Space and Postoperative Outcomes: A Systematic Review
Authors: Rezzadeh Kevin , Donnelly Megan , Daar David , Hacquebord Jacques
Published: July 2019

Background A common notion is that more complex techniques for treating trapeziometacarpal arthritis such as ligament reconstruction and tendon interposition (LRTI) better preserve the scaphometacarpal (SMC) space compared to a simple trapeziectomy and that this leads to superior functional outcomes.

Purpose The purpose of this systematic review is to evaluate the relationship between scaphometacarpal space and objective outcomes such as grip and pinch strength as well as subjective patient-reported outcomes.

Methods A systematic review of the literature was conducted according to PRISMA guidelines. Inclusion criteria were studies reporting SMC space and outcomes after surgery for carpometacarpal arthritis. The primary outcomes of these studies included any measure of postoperative scaphometacarpal space (trapezial height/trapezial index) as well as key pinch strength, grip strength, or lateral pinch strength. Studies that did not assess for association between SMC space and outcomes were excluded.

Results Fourteen studies were included in this systematic review. Three (21.4%) studies found a statistically significant correlation between postoperative SMC space and postoperative pinch or grip strength. The correlation was weakly positive in one study (key pinch vs. scaphometacarpal space, r = 0.13), positive but unlisted in another (lateral pinch vs. trapezial ratio), and negative in the third study (key pinch vs. trapezial space ratio, r = −0.47).

Conclusion Preservation of the SMC space postoperatively is not associated with postoperative outcomes. Further research is necessary to better characterize the importance of maintaining the SMC space in patients undergoing LRTI in order to substantiate claims by proponents of the procedure.
Bridging versus Nonbridging Dynamic External Fixation of Unstable Distal Radius Fractures in the Elderly with Polytrauma: A Randomized Study
Authors: Aita Marcio Aurelio , Rodrigues Fabio Lucas , Alves Karyse Helena Crispim Ribeiro , de Oliveira Ricardo Kaempf , Ruggiero Gustavo Mantovani , Rodrigues Luciano Miller Reis
Published: July 2019

Background Despite the high prevalence of unstable distal radius fractures (DRFs), there is no consensus regarding the optimal method and treatment timing, especially for elderly patients with multiple associated injuries.

Purpose This study aimed to compare the grip strength achieved with two different methods for definitive dynamic external fixation of DRFs in elderly patients with polytrauma operated on within the first 24 hours.

Methods In this prospective randomized trial, 35 patients were assigned to undergo definitive external dynamic fixation of DRFs using the nonbridging (group A) or bridging (group B) method. The grip strength, range of motion (ROM), Disabilities of the Arm, Shoulder and Hand (QuickDASH) outcome measure, visual analog scale (VAS) score for pain, and radiographic characteristics were evaluated at 6 and 12 months.

Results At 12 months, no significant between-group difference was observed with respect to grip strength. All patients showed results in the third or fourth quartiles. The mean ROMs were 96.94 and 96.38% and the mean QuickDASH scores were 3.53 and 3.85 in groups A and B, respectively. The VAS scores were 1.60 and 1.85 in groups A and B, respectively. The overall complication rates were 13.3 and 15% in groups A and B, respectively. Initial fracture reduction was maintained in 86.67 and 95% of the patients in groups A and B, respectively.

Conclusions Both bridging and nonbridging external definitive dynamic fixation proved safe and reliable for the treatment of unstable DRFs in elderly patients with polytrauma. The grip strength results in both groups predicted the restoration of ability in elderly patients to perform activities of daily living independently.
Technology Use in Ophthalmology Resident Education: Results to Aid Program Directors in Curriculum Development
Authors: Lindsey Jennifer L. , Wayman Laura L. , Garrison Etoi A. , Davidson Mario , Dewey Charlene M.
Published: July 2019

Background The Accreditation Council for Graduate Medical Education in ophthalmology lists the use of information technology to optimize learning as a common program requirement. The use of technology in published studies often takes the form of e-learning. No study to date outlines what methods are preferred by residents and faculty in United States Ophthalmology programs.

Objective We conducted a needs assessment to evaluate the current state of technology in teaching and learning in an ophthalmology residency program, to identify barriers to using technology, and to determine areas for future curriculum development.

Methods We used an anonymous online survey to assess current residents and faculty within our ophthalmology residency program.

Results Residents identified their primary learning styles as visual and kinesthetic and they preferred videos and online question banks.

More than 35% of faculty respondents “never” use technology in teaching. Among faculty who do use technology, online quizzes and videos were the most common modalities used to supplement lectures. Common barriers to incorporating technology included lack of time, lack of knowledge of available technologic tools, and lack of skill in using technology.

Both faculty and residents identified a Web platform for curricular elements and a feedback app as potentially beneficial additions to the curriculum. Each group rated an app to receive feedback more highly than an app to provide it. The two groups disagreed on the usefulness of online quizzes. There was variability among faculty responses regarding the usefulness of technology in teaching.

Conclusion Our needs assessment identified areas of agreement among residents and faculty as well as mismatches and barriers regarding the use of technology to support learning by ophthalmology residents. Our study is an example of a best practice for use of a needs assessment to provide a framework for curriculum development and program improvement in an individual program. Further research is needed to generalize these results across ophthalmology programs.
8.1.6 Product Subclass 6: Lithium Amides
Authors: Nieto C. T. , Eames J. , Garrido N. M.
Published: July 2019

This chapter describes methods for the synthesis of lithium amides and their applications in C—N and C—C bond formations, including stereoselective transformations.
A nonlinear conservation law with a step function involving the flux: A distributional approach
Authors: Sarrico C. O. R.
Published: July 2019

The present paper concerns a Riemann problem for a conservation law with a nonlinear flux involving a step function. In a convenient space of distributions, we will see the emergence of a delta standing wave which extends the corresponding result, obtained by Sun in 2013 and also by Shen in 2014, for a linear flux. In the nonlinear setting, a new phenomenon arises: starting from a vanishing initial condition, the concentration of matter in a fixed point becomes possible. These results are easy to get essentially because, in our approach, the product of distributions is a distribution that does not depend of approximation processes.
Thermoelectric properties of inverse perovskites A3TtO (A = Mg, Ca; Tt = Si, Ge): Computational and experimental investigations
Authors: Pöhls Jan-Hendrik , Mar Arthur
Published: July 2019

Oxygen-containing inverse perovskites represent one possible solution to reduce the cost and enhance the sustainability of thermoelectric materials. Although oxygen-containing compounds may be thought to reduce the electronic mobility and thus the thermoelectric performance, computational studies on A3TtO (A = Mg, Ca; Tt = Si, Ge) revealed that they exhibit high electrical conductivity originating from Dirac cones at valence and conduction bands. High Seebeck coefficients were predicted arising from multiple degenerate bands, leading to enhanced power factors, and low thermal conductivities were predicted using the minimum thermal conductivity model. These predictions were validated by experimental studies on Ca3SiO and Ca3GeO, which were synthesized through high-temperature methods. They adopt an orthorhombic structure (space group Imma). Transport measurements show high Seebeck coefficients and low thermal conductivities for these compounds, confirming their potential for high thermoelectric performance.
Synthesis and magnetic properties of 4:1 hard-soft SrFe12O19-La1-xSrxMnO3 nanocomposite prepared by auto-combustion method
Authors: Dahal J. N. , Neupane D. , Poudel T. P.
Published: July 2019

Magnetic nanocomposite (hard) SrFe12O19-(soft) La(1-x) SrxMnO3 powders in 4:1 weight ratio was synthesized via a one-pot auto-combustion technique using nitrate salts followed by heat treatment in air at 950°C. Structural and morphological characterizations were performed via x-ray diffraction (XRD) and transmission electron microscopy (TEM). Vibrating sample magnetometer (VSM) was used to study the magnetic properties of the samples. XRD analysis shows presence of pure phase components in the nanocomposite. TEM images show presence of needle shape Sr-Ferrite particles. The room temperature hysteresis loops of the samples showed the presence of exchange-coupling between the hard and soft phases of the composite. The room temperature magnetic measurements revealed the higher Mr/Ms ratio for the nanocomposite than that for the single phase SrFe12O19 which proves the existence of the inter-grain exchange coupling between hard and soft magnetic phases with the exchange spring behavior. The highest Mr/Ms ratio of 0.58 was obtained in SrFe12O19- La0.25Sr0.75MnO3 composite which exhibited 82% increase in the coercivity (Hc∼6.26 kOe) as compared to pure SrFe12O19 (Hc∼3.63kOe). Synthesis of hard-soft exchange couple nanocomposite by controlling the “magnetic softness” of a soft phase instead of more traditional approach of varying concentration of the soft phase could be the promising way to use them in many magnetic applications.
Surface wettability and strong adhesion of medical polyurethane elastomer porous films by microphase separation
Authors: Xue Mingshan , Ji Yuwei , Ou Junfei , Wang Fajun , Li Changquan , Lei Sheng , Li Wen
Published: July 2019

Inspired by geckos and parthenocissus tricuspidata, bionic high-adhesive materials have attracted great attention in the fields of environmental protection, biomedicine and intelligent control. The key is how to select appropriate materials and preparation methods to design materials with strong adhesion similar to the geckos. In this paper, the polyurethane elastomer (PUE) porous films with medical grade were successfully prepared by microphase separation method, and the microstructure, surface wettability and adhesion were investigated. It was found that the growth parameters (such as relative humidity, concentration and curing time) had important effects on the microstructure and morphology of PUE films. After modification with 1-dodecanethiol, the contact angle on the surface of the PUE film increased from the pre-modification value of 80° to 165°, but the corresponding rolling angle remained constant. The honeycomb PUE porous films have specially strong adhesion similar to geckos and parthenocissus tricuspidata, which will be expected to apply to the medical domain such as used as the external plaster to ensure adequate contact with skin and also prevent the evaporation of drugs and water.
Evidence for the formation of metallic In after laser irradiation of InP
Authors: Cabral L. , Andrés J. , Machado T. R. , Picinin A. , Rino J. P. , Lopez-Richard V. , Longo E. , Gouveia A. F. , Marques G. E. , da Silva E. Z. , San-Miguel M. A.
Published: July 2019

Structural and electronic changes induced by laser irradiation are currently of interest owing to the possibility to tune the mechanical, optical, and transport properties of the irradiated materials. In this work, we investigate the effects of laser irradiation on indium phosphide, InP, by modifying the electronic temperature, Te, of the system within the density functional theory framework and performing molecular dynamics simulations to prove that the laser irradiation also provokes a local thermalization effect. We found that the process can be described by a two-stage mechanism. First, at low Te values (0–1.0 eV), the laser energy induces electronic transitions, while the InP lattice remains undisturbed and cool. In the second stage (with Te in the range of 1.0–4.0 eV), both electron-electron scattering and electron-phonon coupling processes are triggered, increasing the energy of the lattice so as to provoke a Coulomb explosion, which changes some physical chemical properties of InP. The close agreement between the simulations helps explain the formation of metallic In as it is observed in the transmission electron microscopy images.
Ohm’s law for ion conduction in lithium and beyond-lithium battery electrolytes
Authors: Galluzzo Michael D. , Maslyn Jacqueline A. , Shah Deep B. , Balsara Nitash P.
Published: July 2019

The viability of next generation lithium and beyond-lithium battery technologies hinges on the development of electrolytes with improved performance. Comparing electrolytes is not straightforward as multiple electrochemical parameters affect the performance of an electrolyte. Additional complications arise due to the formation of concentration gradients in response to dc potentials. We propose a modified version of Ohm’s law to analyze current through binary electrolytes driven by a small dc potential. We show that the proportionality constant in Ohm’s law is given by the product of the ionic conductivity, κ, and the ratio of currents in the presence (iss) and absence (iΩ) of concentration gradients, ρ+. The importance of ρ+ was recognized by Evans et al. [Polymer 28, 2324 (1987)]. The product κρ+ is used to rank order a collection of electrolytes. Ideally, both κ and ρ+ should be maximized, but we observe a trade-off between these two parameters, resulting in an upper bound. This trade-off is analogous to the famous Robeson upper bound for permeability and selectivity in gas separation membranes. Designing polymer electrolytes that overcome this trade-off is an ambitious but worthwhile goal.
Efficacy and safety of dapoxetine for premature ejaculation: an updated systematic review and meta-analysis
Authors: Zhao Guo-Jiang , Guo Qiang , Li Yu-Feng , Zhang Yan-Gang
Published: July 2019

We conducted a systematic review and meta-analysis of published randomised controlled trials of dapoxetine for premature ejaculation. We systematically searched Embase, PubMed, Cochrane, Web of Knowledge, FDA.gov and Clinical Trials.gov for studies reporting dapoxetine in men with premature ejaculation. Efficacy endpoints included intravaginal ejaculatory latency times (IELT), personal distress related to ejaculation (PDRE) and treatment-emergent adverse events (TEAEs) was used to evaluate safety. Data were analysed using a random-effects model. Electronic search identified 276 papers. The final analysis included eight papers (n = 8422 subjects). Analysis of the pooled results indicated efficacy in both IELT (weighted mean difference (WMD) = 1.67, 95% confidence interval (CI) 1.45–1.89) and PDRE (relative risk = 1.26, 95% CI 1.18–1.35). Subgroup analysis indicated efficacy (i.e. increase in IELT) for 30- and 60-mg on-demand dapoxetine (WMD 1.38 (95% CI 1.01–1.75) and 1.62 (95% CI 1.40–1.84) respectively), as well as daily use of 60 mg dapoxetine (WMD 2.18, 95% CI 1.71–2.64). The safety profile was acceptable. Based on the different effects of magnitude of the three dosing regimens, we recommend a stepwise approach, starting with 30 mg on demand, then 60 mg on demand and finally 60 mg dapoxetine daily.
Using hominin introgression to trace modern human dispersals
Authors: Teixeira João C. , Cooper Alan
Published: July 2019

The dispersal of anatomically modern human populations out of Africa and across much of the rest of the world around 55 to 50 thousand years before present (ka) is recorded genetically by the multiple hominin groups they met and interbred with along the way, including the Neandertals and Denisovans. The signatures of these introgression events remain preserved in the genomes of modern-day populations, and provide a powerful record of the sequence and timing of these early migrations, with Asia proving a particularly complex area. At least 3 different hominin groups appear to have been involved in Asia, of which only the Denisovans are currently known. Several interbreeding events are inferred to have taken place east of Wallace’s Line, consistent with archaeological evidence of widespread and early hominin presence in the area. However, archaeological and fossil evidence indicates archaic hominins had not spread as far as the Sahul continent (New Guinea, Australia, and Tasmania), where recent genetic evidence remains enigmatic.
汉语自然口语会话中的信息回应标记 “真的(吗/啊)”
Authors: Zhang Wenxian
Published: July 2019

抽象

“真的（吗/啊）？”是一般疑问句的形式，但是在自然口语会话中并不只是因怀疑对方所说信息真假而表达疑问，而是回应标记。本文从互动交际的角度出发，论述了“真的（吗/啊）”在会话序列中的功能。“真的（吗/啊）”在会话中表示得到的完全是新信息或者信息与自己的背景知识有差异，表达意外、惊讶等情感。在会话结构上，“真的（吗/啊）”与主要讲述者结构一致，即不与之抢夺说话权，请对方继续说下去。
Square dancing
Authors: Zhang Qi , Min Ge
Published: July 2019

Square dancing,guangchangwuin Chinese, is a kind of physical activity practiced in flat public spaces for fitness and entertainment. Despite its popularity all over China, there have been news reports on conflicts caused by it, such as noise pollution or use of a public square. This study collects 150 news articles published between May 2016 and May 2018 containing the keywordguangchangwufrom thePeople’s Daily, one of the most influential official newspapers owned by the Central Committee of the Communist Party of China. The purpose of the study is to investigate the government’s attitudes towards square dancing through an analysis of the official media discourse, using word frequency of occurrence and multimodal discourse analysis. Both the word count and the co-deployment of visual and linguistic resources indicate that square dancing is perceived as an integral part of promoting the national fitness agenda. While the discourse demonstrates awareness of square dancing in the context of an aging society and a shortage of public space, general approval for it is still quite evident in the frequent positive descriptions in the text and presentations in the images. The use of the worddama‘big mama’ in the official media discourse reveals gender inequality in contemporary China.
Dialogical strategies in replies to offensive humour
Authors: Canestrari Carla , Viana Amadeu
Published: July 2019

The aim of this paper is to determine whether humour can be used as a discursive strategy to reply to offensive humour about natural disasters and what purpose it serves. A corpus of 431 replies to the Charlie Hebdo cartoons concerning the earthquake in central Italy in August 2016 was analysed. Depending on the target of the humour in these replies, they were used to agree, disagree or deflect away from the offensive and aggressive content of the cartoons. The results show that humour can be used as a discursive strategy to respond to offensive humour. Moreover, an analysis of the corpus revealed that humorous replies were used mainly to agree rather than disagree with the cartoons.
Dialogue and Artificial Intelligence
Authors: Weigand Edda
Published: July 2019

The article focuses on a few central issues of dialogic competence-in-performance which are still beyond the reach of models of Artificial Intelligence (AI). Learning machines have made an amazing step forward but still face barriers which cannot be crossed yet. Linguistics is still described at the level of Chomsky’s view of language competence. Modelling competence-in-performance requires a holistic model, such as the Mixed Game Model (Weigand 2010), which is capable of addressing the challenge of the ‘architecture of complexity’ (Simon 1962). The complex cannot be ‘the ontology of the world’ (Russell and Norwig 2016). There is no autonomous ontology, no hierarchy of concepts; it is always human beings who perceive the world. ‘Anything’, in the end, depends on the human brain.
A progress report on the MAB phases: atomically laminated, ternary transition metal borides
Authors: Kota Sankalp , Sokol Maxim , Barsoum Michel W.
Published: July 2019

The MAB phases are atomically layered, ternary or quaternary transition metal (M) borides (TMBs), with the general formula (MB)2 zA x(MB2) y ( z = 1–2; x = 1–2; y = 0–2), whose structures are composed of a transition M-B sublattices interleaved by A-atom (A = Al,Zn) mono- or bilayers. Most of the MAB phases were discovered before the 1990s, but recent discoveries of intriguing magnetocaloric properties, mechanical deformation behaviour, catalytic properties, and high-temperature oxidation resistance has led to their ‘re-discovery’. Herein, MAB phase synthesis is reviewed and their magnetic, electronic, thermal, and mechanical properties are summarized. Because the M-B layers in the MAB phases structurally resemble their corresponding binaries of the same M:B stoichiometry, the effects of the A-layers on properties are discussed. Inconsistencies in the literature are critically assessed to gain insights on the processing-structure-property relations, suggest fruitful avenues for future research, and identify limitations for prospective applications.
Analysis and Verification of the Relationship between the Maximum Mass Sensitivity of Quartz Crystal Microbalance and Electrode Parameters*
Authors: Pan Wei , Huang Xian-He , Chen Qiao , Fan Zhi-Chao , Xu Yuan
Published: July 2019

We analyze the effect of electrode diameter and thickness on the mass sensitivity. Through the theoretical approximate calculation, we find that the mass sensitivity does not change monotonically with electrode diameter and there is a maximum point. The optimum electrode diameter corresponding to the maximum mass sensitivity varies with the electrode thickness. For a particular electrode diameter, a quartz crystal microbalance (QCM) with thick electrode has a higher mass sensitivity. A proper plating experiment using 35 QCMs with different electrode diameters and thicknesses verifies this finding. The present study further reveals how electrode size affects mass sensitivity and is helpful for QCM design.
Contrasting Magnetism in Isovalent Layered LaSr3NiRuO4H4 and LaSrNiRuO4 due to Distinct Spin-Orbital States*
Authors: Wen Xuan , Yang Ke , Wu Hua
Published: July 2019

The recently synthesized first 4d
transition-metal oxide-hydride LaSr
3
NiRuO
4
H
4
with the unusual high H:O ratio surprisingly displays no magnetic order down to 1.8 K. This is in sharp contrast to the similar unusual low-valent Ni
+
-Ru
2+
layered oxide LaSrNiRuO
4
which has a rather high ferromagnetic (FM) ordering Curie temperature T
C ∼ 250 K. Using density functional calculations with the aid of crystal field level diagrams and superexchange pictures, we find that the contrasting magnetism is due to the distinct spin-orbital states of the Ru
2+
ions (in addition to the common Ni
+
S = 1/2 state but with a different orbital state): the Ru
2+
S = 0 state in LaSr
3
NiRuO
4
H
4
, but the Ru
2+
S = 1 state in LaSrNiRuO
4. The Ru
2+
S = 0 state has the (xy)2(xz,yz)4
occupation due to the RuH
4
O
2
octahedral coordination, and then the nonmagnetic Ru
2+
ions dilute the S = 1/2 Ni
+
sublattice which consequently has a very weak antiferromagnetic superexchange and thus accounts for the presence of no magnetic order down to 1.8 K in LaSr
3
NiRuO
4
H
4. In strong contrast, the Ru
2+
S = 1 state in LaSrNiRuO
4
has the (3z
2–r
2)2(xz,yz)3(xy)1
occupation due to the planar square RuO
4
coordination, and then the multi-orbital FM superexchange between the S = 1/2 Ni
+
and S = 1 Ru
2+
ions gives rise to the high T
C
in LaSrNiRuO
4. This work highlights the importance of spin-orbital states in determining the distinct magnetism.
Flux density measurements for 32 pulsars in the 20 cm observing band
Authors: Xie Yan-Wei , Wang Jing-Bo , Hobbs George , Kaczmarek Jane , Li Di , Zhang Jie , Dai Shi , Cameron Andrew , Zhang Lei , Miao Chen-Chen , Yuan Mao , Wang Shen , Zhang Song-Bo , Xu Heng , Xu Ren-Xin
Published: July 2019

Flux densities are fundamental observational parameters that describe a pulsar. In the current pulsar catalogue, 27% of the listed radio pulsars have no flux density measurement in the 20 cm observing band. Here, we present the first such measurements for 32 pulsars observed employing the Parkes radio telescope. We have used both archival and new observations to make these measurements. Various schemes exist for measuring flux densities and we show how the measured flux densities vary between these methods and how the presence of radio-frequency interference will bias the flux density measurements.
Reviving the stalled shock by jittering jets in core collapse supernovae: jets from the standing accretion shock instability
Authors: Soker Noam
Published: July 2019

I present a scenario by which an accretion flow with alternating angular momentum on to a newly born neutron star in a core collapse supernova (CCSN) efficiently amplifies magnetic fields and by that launches jets. The accretion flow of a collapsing core on to the newly born neutron star suffers spiral standing accretion shock instability (SASI). This instability leads to a stochastically variable angular momentum of the accreted gas, which in turn forms an accretion flow with alternating directions of the angular momentum, and hence alternating shear, at any given time. I study the shear in this alternating-shear sub-Keplerian inflow in published simulations, and present a new comparison with Keplerian accretion disks. From that comparison I argue that it might be as efficient as Keplerian accretion disks in amplifying magnetic fields by a dynamo. I suggest that although the average specific angular momentum of the accretion flow is small, namely, sub-Keplerian, this alternating-shear accretion flow can launch jets with varying directions, namely, jittering jets. Neutrino heating is an important ingredient in further energizing the jets. The jittering jets locally revive the stalled accretion shock in the momentarily polar directions, and by that they explode the star. I repeat again my call for a paradigm shift from a neutrino-driven explosion of CCSNe to a jet-driven explosion mechanism that is aided by neutrino heating.
Orbital parameters and period variation studies of the short-period eclipsing binaries FG Sct, VZ Lib and VZ Psc
Authors: Yue Qiang , Zhang Li-Yun , Han Xian-Ming L. , Lu Hong-Peng , Long Liu , Yan Yan
Published: July 2019

We present eight sets of new light curves for binaries FG Sct, VZ Lib and VZ Psc, which are all contact eclipsing binaries with short orbital periods. We carried out our observations from 2016 to 2017 using the 60-cm telescope administered by National Astronomical Observatories, Chinese Academy of Sciences, the Holcomb Observatory at Butler University and the SARA-CT telescope in Chile. We firstly determined the orbital parameters of FG Sct using the O − C method and obtained photometric solutions utilizing the updated W-D program. We also studied its period variation and discovered that its orbital period is decreasing at a rate of 6.39(±0.24) × 10−8 d yr−1, which was likely caused by mass transfer from the primary component to the secondary component or angular momentum interchange between the two components via magnetic interactions. For VZ Lib and VZ Psc, we simultaneously analyzed their BV RI light curves in conjunction with the published radial velocities. In order to obtain the orbital parameters of VZ Lib, we also analyzed its period variation and revised cyclic change, which could be attributed to either the light-time effect due to a tertiary companion or magnetic activity cycle mechanism. We derived the periods of the tertiary component of VZ Lib to be 48.7(±0.1) yr or magnetic cycle to be 46.9(±1.9) yr. Strong emission lines at Ca ii H+K, Hα, Hβ, Hγ and Ca ii IRT were detected in the LAMOST spectra of VZ Psc, which imply chromospheric activities in this binary system.
RETRACTED: Opportunities, challenges and Countermeasures for the development of China’s sports industry in the era of big data
Authors: Liu Hao
Published: July 2019

Opportunities faced by China’s sports industry in the era of big data are as follows: the mining and analysis of big data creates more value for the sports industry; promotes the coordinated innovation and development of sports industry clusters; and accelerates the technological progress of the sports industry. This is both an opportunity and a challenge for the sports industry. At present, the following problems still exist in sports industry: lack of human resources to complete advanced data management and development in sports industry; difficulties in data storage in sports industry; inadequate depth of data mining in sports industry; difficulty in guaranteeing user information and privacy; strong competitiveness of foreign-funded enterprises to domestic enterprises. Some countermeasures are put forward, such as solving the problem of sports big data storage, improving the ability of big data processing and service, introducing advanced data processing manpower, building scientific research team, protecting personal privacy, and doing a good job of sports industry collaborative innovation research.
A new method of terrain self-adaptive matching algorithm for autonomous underwater vehicle
Authors: Lu Xiong , Jian Shen , Xiaowen Bi
Published: July 2019

As different underwater terrain features will affect the accuracy of unscented Kalman filter terrain matching algorithm, a new terrain self-adaptive matching method is proposed which adjusts sigma point distribution by terrain features. The connection between sigma point distribution distance and three basic terrain features were analysed. Positioning error range were calculated using navigation positioning errors and underwater digital map. Terrain elevation standard deviation was used to characterize the information quantity of decision region. Scaling parameter was adjusted using linear mapping method and sigma point distribution distance was determined by terrain features. The simulation results proved better terrain adaptability and positioning precision of improved self-adaptive matching algorithm.
Reduction algorithm based on finding the maximum mutual information in incomplete information systems
Authors: Feng Weibing , Zhang Manting
Published: July 2019

Aiming at such drawbacks of the existing incomplete information system attribute reduction algorithms as high time complexity and insufficiency of the reduction result completeness, this paper proposes an attribute reduction algorithm based on finding the maximum mutual information via weakening the equivalence class in classical rough set theory into tolerance class and through combining the definition of information entropy with the tolerance class. Taking the mutual information of condition attribute and decision attribute as the iterative criterion, and the empty set as the initial reduction, the algorithm superposes the condition attribute set corresponding to the maximum value of the mutual information of condition attributes and decision attributes, thus equating the mutual information of condition attribute set and decision attribute with the information entropy of decision attribute, obtaining the relative reduction of the incomplete decision system and guaranteeing the completeness of the reduction result. In the solution of the attribute set tolerance class, an algorithm with lower time complexity is adopted, which can reduce the time complexity of the whole algorithm. The feasibility of the algorithm is illustrated by an example.
Study on optimization of weight on bit for automatic bit feeding based on improved ant colony algorithm
Authors: Liu Guangxing , Li Qiaohua
Published: July 2019

In the process of automatic bit feeding, to make the drilling process reach the optimal technical and economic indicators, the effect of the parameters on the drilling process should be analyzed. A drilling control parameter optimization model taking unit footage cost as the objective function is established to seek the optimal weight on bit (WOB) - rotary speed combination under certain constraint conditions. The objective function is optimized by the improved ant colony algorithm, and is finally applied to the specific example for simulation. A contrastive analysis is carried out with several kinds of typical optimization algorithm. It is indicated from the result that the improved ant colony algorithm can effectively reduce the unit footage cost, prolong the service life of drill bit, and shorten the trip time.
An Elastic Combination Forecasting Method for Urban Road Traffic Status
Authors: Wang Cheng , Pang Xiyu , Xi Zhonghua , Si Guannan
Published: July 2019

In intelligent transportation system, urban road traffic flow status prediction plays an important role. Study shows that the traffic flow status has fractal phenomenon in a certain time scale, so using fractal method to excavate the inherent regularity of traffic flow time series can avoid some difficulties of analyzing the traffic flow influencing factors. This paper proposes a new forecasting algorithm of urban road traffic status based on fractal theory, and in the algorithm, the calculation of fractal dimension is based on the structural function method, and the design of the algorithm takes into account the traffic conditions at different time intervals based on the prediction time. The experimental results indicate that the proposed algorithm is capable of dealing with complex nonlinear urban traffic flow forecasting with satisfying accuracy and effectiveness.
Performance Analysis of CFAR Detector Based on Censored Mean and Cell Average
Authors: Ma Jian , Xiang Jianjun , Peng Fang
Published: July 2019

It is proposed in this paper that a new constant false alarm rate detector based on censored mean and cell average. The detector takes the mean value of censored mean and cell average as noise or clutter power estimation. Under homogeneous background and Swerling II target models, The detection probability analytic expressions and the false alarm probability analytic expressions of the detector are derived. In homogeneous background and multiple interfering targets situation, the detection performance of the detector is analyzed. Compared with the classical detectors, such as the cell average detector, the greatest of detector and the smallest of detector, the new detector has better detection performance both in homogeneous background and in multiple interfering targets situation.
Research on Lightweight and Fast Image Style Transform Algorithm
Authors: Xue Nan , Duan Jin , Song Xuanmeng , Han Xuehui , Yu Lintao
Published: July 2019

Image style transform technology refers to the use of a convolutional neural network to extract the style of a famous painting, thereby converting the input image into a corresponding style image. The current methods are mainly divided into two types, namely, the style transform method proposed by Gatys and the fast image style transform method (FNST) proposed by Li Feifei. The common problem between the two methods is that the hardware requirements are high, which is not conducive to a wide range of popularization and application. In order to use image style transform on more terminals and even mobile phones, research h on lightweight and fast image style transform is of great significance. This paper draws on the deep-wise split convolution in MobileNets to prun the convolutional layer in the loss network. After the pruning, the parameter content is only 11% of the original model; the residual component in Image Transform Net is trimmed. The parameter content was reduced by 96% compared to the original model. However, the amount of parameters in the process of weight reduction is greatly reduced, which may lead to the degradation of the stylized effect. It is proved by experiments that the style degradation of the method is not obvious, that is to say that the performance loss caused by the reduction of the parameter quantity is acceptable.
Multiconstrained routing based on artificial bee colony algorithm and dynamic fireworks algorithm
Authors: Zhang XianWei , Hu Youbing
Published: July 2019

In this paper, a mathematical model for multiconstrained routing optimization problem is established. The multi-objective optimization problem is transformed into a single-objective optimization problem by adding a penalty function. Then the artificial bee colony algorithm (ABC) is used for route search. Because the ABC algorithm is easy to fall into the local optimal deficiencies, the dynamic fireworks algorithm (dynFWA) is introduced for local search, which can ensure fast global search and fast guarantee. In the process of searching for the optimal solution, the success rate is improved by about 1.05% compared with the PSO_ACO algorithm optimized by the ant colony algorithm, which is 6.18% higher than the standard PSO algorithm and the standard ABC algorithm. The minimum average cost of the search is about 0.53% higher than the PSO_ACO algorithm, which is about 1.87% higher than the other two algorithms. The simulation results show that the algorithm can effectively solve the multiconstrained routing problem under large-scale networks.
An Improved Multidimensional Query Language for Oil and Gas Development Data Warehouse
Authors: Zhao Jidong , Yao Tingzhen
Published: July 2019

Multidimensional data analysis is the most central technique for processing data in data warehouse and On-Line Analysis Processing (OLAP). In order to solve the problem of multi-dimensional analysis expression and query processing in oil and gas development data warehouse, this paper proposes an improved multi-dimensional query language application method to realize effective interaction between query terminal and OLAP server. This formal language has the following advantages, such as simplicity, flexibility and easy to use. It also meets the needs of multi-dimensional query for oil and gas data analysis, and has various display modes. The results can be displayed in two-dimensional space. And it provides an extended function beyond the standard MDX, simple grammar format, concise and clear semantic expression, and is conducive to query processing conversion.
Implementation of system for college students’ career planning based on user interest model
Authors: Li Xiaomin , Zhang Jianrong , Wan Jiabing , Zhang JinKai , Zhu Chenchao , Guo Nianfeng , Xu Hao
Published: July 2019

In order to help users discover their real interests, and recommend positions and tasks that match their interests scientifically and accurately, the system is different from most of the ability enhancement and job-hunting system on the market. This system relies on artificial intelligence technology, and we design the function of long-term companionship and personalized solutions to help users find the career direction they are interested in, and push tasks periodically according to the recommendation algorithm to help users improve their vocational skills, ultimately to help college students to identify what they really like and rapidly improve their ability.
Study for Submerged Arc Welding Tracing Based on Hopfield Neural Network
Authors: Song Nan , Wu Xiaomeng
Published: July 2019

This paper presents a new method based on Hopfield neural network to find out the welding center. The method transforms the problem of image processing into an optimization problem for searching the welding center. The energy function is constructed to meet the properties of welding image such as great noise. The algorithm combined with median filtering and neural network is also put forward. Examples show that the algorithm is practice and effective in detecting the welding center.
RETRACTED: Research on Information Management Model of Petroleum Enterprises under the Big Data Background
Authors: Yang Jinquan
Published: July 2019

Application of big data is analysed via the present information management of petroleum enterprises in this paper. The logical structure and application architecture are proposed based on hodiernal production, administration and management of oil firms in China and mainstream big data technology. Meanwhile, future applications of the information management are looked ahead under big data environment.
A survey of power flow calculations considering distributed generation
Authors: Wu Xiaomeng , Guo Xinyu , Yang Mingyue , Shi Zheng
Published: July 2019

With the construction of China’s smart grid and the gradual implementation of the power market, the traditional centralized power grid mode has been unable to meet the demand of electricity in today’s society. The introduction of distributed generation has become a new trend in the future development of power grids. Due to the introduction of distributed generation, many new node types will appear in the distribution network. It is often difficult to achieve the expected results when using traditional power flow algorithms when dealing with these nodes. Therefore, it is particularly important to study the power flow calculation of distribution networks with distributed generation. This paper discusses in detail the impact of distributed power sources on distribution networks and the current research status of distribution network power flow calculations with distributed generation.
Some Properties of the WJ Distribution and Implication in Information Theory
Authors: Liang Geying , Xue Han , Jia Qiong , Wu Junhua
Published: July 2019

The WJ probability density distribution function describes a general mechanism for various stochastic processes including extreme events and critical phenomena. This work investigates the potential application of the WJ distribution in information theory, by means of exploring the distribution itself, the probability density distribution function of information entropy and an expression for relative information entropy. Changing the multiple parameters of the function, the WJ probability density distribution function as well as the corresponding information entropy function distribution and relative information entropy is systematically analysed and compared. The characteristics of the WJ probability density distribution function and information entropy function are explicitly manifested, showing application prospective of the distribution in information theory.
PM2.5 Prediction based on Multifractal Dimension and Artificial Bee Colony Algorithm
Authors: Zhang Chen , Wang Xiaofeng , Chen Shengbing , Zou Le , Tang Chao
Published: July 2019

PM2.5 pollution is becoming more and more serious in China. A novel feature selection method based on multi-fractal dimension (MFD) and artificial bee colony algorithm (ABC) is proposed to improve the prediction accuracy of PM2.5. In this method, the MFD is used as the evaluation criterion of feature subsets, and an improved ABC is taken as the search strategy. In this paper, we first use the MFD+ABC method to select the optimal feature subset, then use SVR to predict the next day’s concentration of PM2.5 in Shanghai and Guangzhou. The experimental results show that the proposed method has better performance in both the number of selected features and the prediction accuracy.
An Improved Method for Interest Point Detection in Human Activity Video
Authors: Hu Zhe , Zhang Hong , Yang Yang , Yang Chujun
Published: July 2019

An improved method for human activity recognition in RGB-D video using improved color-depth local spatio-temporal features (CoDe4D) detection method is presented in this paper. Firstly, histogram equalization and correction function are employed to suppress noise of rgb frame and depth frame, respectively. Then a saliency map is constructed by the improved CoDe4D method. In this way, feature points can be obtained by the saliency map, which integrates both depth information and RGB information. Next, the depth cuboid similarity feature (DCSF) is utilized to describe feature vectors. Meanwhile, visual words are generated by bag of feature method. To further improved the estimation accuracy, the SVM with generalized histogram intersection kernel is applied to train and predict categories. It shows good performance on MSR Daily Activity 3D datasets.
Quantification of emotional values for attributes from sentiment analysis based on mobile phone reviews
Authors: Tao Wan , Zhang Qiang , Zhang Mengyao , Jiang Yan
Published: July 2019

E-commerce online reviews are commonly short in length, lack of contextual semantics, and are mixed with explicit emotions and implicit emotions. The subjects of implicit emotions are not easy to be extracted and be defined. Now product-oriented attributes are used to define implicit and fine-grained emotions with the help of the domain emotion dictionary that is constructed by extracted explicit attribute-emotion pairs through using a variety of part-of-speech rules. And implicit emotion and attribute pairs for product “mobile phone” are mined with the help of explicit attribute-emotion pairs and probability calculation method. At last, explicit and implicit emotion values are calculated by considering degree and negative modifiers. The experimental results show that proposed method is effective and has certain commercial value. And the process method is easy to extend to other product fields.
Reviews and analyses the privacy-protection system for multi-server
Authors: Hwang Min-Shiang , Fajar Cahyadi Eko , Chiou Shu-Fen , Yang Cheng-Ying
Published: July 2019

Zhu proposed a provable privacy-protection system which could achieve two kinds of privacy protection and switch between them optionally by users. He claimed his scheme could achieve anonymous, privacy-protection, and practical multi-server architecture. His scheme is based on chaotic maps. He thus claimed his scheme can not only own high efficiency and unique functionality but is also robust to various attacks and achieves perfect forward secrecy. However, in this article, we will review Zhu’s scheme, applied in a multi-server environment and adopted in the provable privacy protection system. In addition to the review, we analyzed its protocol and elaborated its weakness of resulting insecurity.
Research on the Relationship between Virtual Economy and Real Economy Development in China
Authors: Shang Yu
Published: July 2019

The development scale and degree of virtual economy should be adapted to the development level of real economy, and maintaining a moderate development proportion relationship between the two is the key to promoting sound and rapid economic development. Based on the perspective of economic development and the logistic model in population ecology, this paper constructs a regional virtual economy and real economy development model on the basis of the relationship between virtual economy and real economy development, studies the equilibrium and stability of the coordinated development of the two, and empirically studies the coordinated development ratio of virtual economy and real economy in China using the relevant data of the development of virtual economy and real economy from 1996 to 2008. The coordinated development relationship between virtual economy and real economy can reflect the evolution trend of economy. The coordinated development ratio can play a certain early warning role for the excessive expansion of virtual economy, and effective monetary and fiscal policies can be formulated according to the relationship between the actual ratio and the reasonable development ratio.
Cultivation of Computational Thinking in College Computer Basic Teaching
Authors: Ru Zhang
Published: July 2019

Cultivating college students’ computational thinking is an important teaching plan in computer basic teaching in university stage. Teachers should integrate the teaching content according to the level of computer basic knowledge and ability of college students, classify the basic teaching contents of college computer scientifically and increase the part of experimental teaching in the college computer teaching classroom. Using scientific computer teaching methods can improve students’ computational thinking effectively, so that the comprehensive ability of college students can be improved.