bluuebunny/crossref_metadata_2025_split huggingface dataset:
H i and H2 properties and star formation efficiency of NGC 4654 in the cluster environment
Authors: Chung Eun Jung , Kim Sungeun 
Published: February 2014

Abstract
NGC 4654, an Scd galaxy in the Virgo cluster, is asymmetric in its H i distribution, with a sharp cutoff in the north-west and a long tail in the south-east, while its CO is extended to the north-west where the H i is compressed and hence its surface density is increased. This galaxy is reported to have experienced tidal interaction about 500 Myr ago, and to have been undergoing ram pressure continuously until now. To investigate the environmental effects on the interstellar medium, we make a point-to-point comparison between the H i, H2, and star formation rate surface densities. The mean H i surface density at the north-west is about 25 M⊙ pc−2, which is higher than the threshold where H i surface density begins to saturate. The ratio of molecular to atomic hydrogen (Rmol) in the north-west region is lower than that of the other regions. Star formation efficiency with respect to the molecular gas (SFEH2) at the north-west appears to be higher than the other regions with the same total gas surface density. We discuss the high SFEH2 at the north-west region and propose the possibility that the intracluster medium (ICM) pushes the low-metal gas from the outer radius into the north-west region. In a low-metallicity environment, it has been reported that high ΣH i can exist without saturation and stars can be formed from the cold atomic hydrogen phase rather than from the molecular phase. Suggestion of inflow of the outer metal-poor gas into the north-west explains well the high ΣH i and SFEH2 of the north-west region. We suggest another possibility, of H i conversion into H2 due to the increase of gas surface density and midplane pressure due to the ICM pressure at the north-west.
Emitting electron spectra and acceleration processes in the jet of PKS 0447−439
Authors: Zhou Yao , Yan Dahai , Dai Benzhong , Zhang Li 
Published: February 2014

Abstract
We investigate the electron energy distributions (EEDs) and the corresponding acceleration processes in the jet of PKS 0447−439, and estimate its redshift through modeling its observed spectral energy distribution (SED) in the frame of a one-zone synchrotron-self Compton (SSC) model. Three EEDs formed in different acceleration scenarios are assumed: the power-law with exponential cut-off (PLC) EED (shock-acceleration scenario or the case of the EED approaching equilibrium in the stochastic-acceleration scenario), the log-parabolic (LP) EED (stochastic-acceleration scenario and the acceleration dominating), and the broken power-law (BPL) EED (no acceleration scenario). The corresponding fluxes of both synchrotron and SSC are then calculated. The model is applied to PKS 0447−439, and modeled SEDs are compared to the observed SED of this object by using the Markov Chain Monte Carlo method. The results show that the PLC model fails to fit the observed SED well, while the LP and BPL models give comparably good fits for the observed SED. The results indicate that it is possible that a stochastic acceleration process acts in the emitting region of PKS 0447−439 and the EED is far from equilibrium (acceleration dominating) or no acceleration process works (in the emitting region). The redshift of PKS 0447−439 is also estimated in our fitting: z = 0.16 ± 0.05 for the LP case and z = 0.17 ± 0.04 for BPL case.
Processing-Body Movement in Arabidopsis Depends on an Interaction between Myosins and DECAPPING PROTEIN1
Authors: Steffens Alexandra , Jaegle Benjamin , Tresch Achim , Hülskamp Martin , Jakoby Marc 
Published: February 2014

AbstractProcessing (P)-bodies are cytoplasmic RNA protein aggregates responsible for the storage, degradation, and quality control of translationally repressed messenger RNAs in eukaryotic cells. In mammals, P-body-related RNA and protein exchanges are actomyosin dependent, whereas P-body movement requires intact microtubules. In contrast, in plants, P-body motility is actin based. In this study, we show the direct interaction of the P-body core component DECAPPING PROTEIN1 (DCP1) with the tails of different unconventional myosins in Arabidopsis (Arabidopsis thaliana). By performing coexpression studies with AtDCP1, dominant-negative myosin fragments, as well as functional full-length myosin XI-K, the association of P-bodies and myosins was analyzed in detail. Finally, the combination of mutant analyses and characterization of P-body movement patterns showed that myosin XI-K is essential for fast and directed P-body transport. Together, our data indicate that P-body movement in plants is governed by myosin XI members through direct binding to AtDCP1 rather than through an adapter protein, as known for membrane-coated organelles. Interspecies and intraspecies interaction approaches with mammalian and yeast protein homologs suggest that this mechanism is evolutionarily conserved among eukaryotes.
The study of the price of gold futures based on heterogeneous investors' overconfidence
Authors: Jiang Wei , Luan Pupu , Yang Chunpeng 
Published: February 2014

Purpose
– The purpose of this paper is to research and analyze the price of gold futures based on heterogeneous investors' overconfidence.

Design/methodology/approach
– This paper divides the traders of gold futures market into two kinds: the speculators and arbitrageurs, and then constructs a market equilibrium model of futures pricing to analyze the behaviors of the two kinds of traders with overconfidence. After getting the decision-making function, the market equilibrium futures price is attained on the condition of market clearing. Then, this paper analyzes how the overconfidence impacts on futures price, volatility of the price of gold futures and the effects on individual utility.

Findings
– Under different market conditions, the overconfidence psychological impacts of heterogeneous investor on the price and volatility of futures are different, sometimes completely opposite.

Originality/value
– In the past literature, the relationships between overconfidence and the price or volatility are positive; however, the study shows that sometimes it is positive, and sometimes it is negative.
Stagnation-point flow of Jeffrey fluid with melting heat transfer and Soret and Dufour effects
Authors: Hayat T. , Iqbal Z. , Mustafa M. , Alsaedi A. 
Published: February 2014

Purpose
– This investigation has been carried out for thermal-diffusion (Dufour) and diffusion-thermo (Soret) effects on the boundary layer flow of Jeffrey fluid in the region of stagnation-point towards a stretching sheet. Heat transfer occurring during the melting process due to a stretching sheet is considered. The paper aims to discuss these issues.

Design/methodology/approach
– The authors convert governing partial differential equations into ordinary differential equations by using suitable transformations. Analytic solutions of velocity and temperature are found by using homotopy analysis method (HAM). Further graphs are displayed to study the salient features of embedding parameters. Expressions of skin friction coefficient, local Nusselt number and local Sherwood number have also been derived and examined.

Findings
– It is found that velocity and the boundary layer thickness are increasing functions of viscoelastic parameter (Deborah number). An increase in the melting process enhances the fluid velocity. An opposite effect of melting heat process is noticed on velocity and skin friction.

Practical implications
– The boundary layer flow in non-Newtonian fluids is very important in many applications including polymer and food processing, transpiration cooling, drag reduction, thermal oil recovery and ice and magma flows. Further, the thermal diffusion effect is employed for isotope separation and in mixtures between gases with very light and medium molecular weight.

Originality/value
– Very scarce literature is available on thermal-diffusion (Dufour) and diffusion-thermo (Soret) effects on the boundary layer flow of Jeffrey fluid in the region of stagnation-point towards a stretching sheet with melting heat transfer. Series solution is developed using HAM. Further, the authors compare the present results with the existing in literature and found excellent agreement.
Study on constitutive model of coupled damage-permeability of porous media
Authors: Xinhua Xue , Wohua Zhang , Yang Xingguo 
Published: February 2014

Purpose
– The paper aims to clarify the relationship between the micro-structures of porous media and the coefficient of permeability. Most materials involve different types of defects like caves, pores and cracks, which are important characters of porous media and have a great influence on the physical properties of materials. To study the seepage mechanical characteristics of damaged porous media, the constitutive model of porous media dealing with coupled modeling of pores damage and its impact on permeability property of a deforming media was studied in this paper.

Design/methodology/approach
– The paper opted for an exploratory study using the approach of continuum damage mechanics (CDM).

Findings
– The paper provides some new insights on the fluid dynamics of porous media. The dynamic evolution model of permeability coefficient established in this paper can be used to model the fluid flow problems in damaged porous media. Moreover, the modified Darcy's law developed in this paper is considered to be an extension of the Darcy's law for fluid flow and seepage in a porous medium.

Research limitations/implications
– Owing to the limitations of time, conditions, funds, etc., the research results should be subject to multifaceted experiments before their innovative significance can be fully verified.

Practical implications
– The paper includes implications for the development of fluid dynamics of porous media.

Originality/value
– This paper fulfils an identified need to study the relationship between the micro-structures of porous media and the coefficient of permeability.
Numerical and analytical solutions for Falkner-Skan flow of MHD Oldroyd-B fluid
Authors: Abbasbandy S. , Hayat T. , Alsaedi A. , Rashidi M.M. 
Published: February 2014

Purpose
– In this paper, analysis is presented to investigate the Falkner-Skan flow of magnetohydrodynamic (MHD) Oldroyd-B fluid. The paper aims to discuss these issues.

Design/methodology/approach
– In this paper, the authors used two methods: homotopy analysis method and numerical Keller-box method.

Findings
– It is observed that skin friction coefficient in Oldroyd-B fluid is larger when compared with viscous fluid. Further, the relaxation and retardation times have opposite effects on the velocity components.

Practical implications
– A comparative study between the series and numerical solutions for the skin friction is shown in the paper. The results indicated that both solutions are in well agreement.

Originality/value
– This model is investigated for the first time, as the authors know.
Exact solutions of fractional heat-like and wave-like equations with variable coefficients
Authors: Tang Bo , Wang Xuemin , Wei Leilei , Zhang Xindong 
Published: February 2014

Purpose– This paper aims to apply fractional variational iteration method using He's polynomials (FVIMHP) to obtain exact solutions for variable-coefficient fractional heat-like and wave-like equations with fractional order initial and boundary conditions.Design/methodology/approach– The approach is based on FVIMHP. The authors choose as some examples to illustrate the validity and the advantages of the method.Findings– The results reveal that the FVIMHP method provides a very effective, convenient and powerful mathematical tool for solving fractional differential equations.Originality/value– The variable-coefficient fractional heat-like and wave-like equations with fractional order initial and boundary conditions are solved first. Illustrative examples are included to demonstrate the validity and applicability of the method.
Modeling defects in castings using a volume of fluid method
Authors: Zhang Sailei , Yanke Jeffrey , R. Johnson David , J.M. Krane Matthew 
Published: February 2014

Purpose
– A single-domain multi-phase model is developed for macrosegregation and shrinkage pipe formation in castings, as functions of buoyancy- and shrinkage-induced flow. The paper aims to discuss these issues.

Design/methodology/approach
– Using a volume of fluid (VOF) method, both the air/liquid and air/solid interfaces are tracked during shrinkage pipe formation. A set of mixture advection-diffusion equations are derived and solved for velocity, temperature, composition, and phase field evolution. The fluid mechanics of the model are verified using a transient ditch drainage problem.

Findings
– Results showing the interaction of macrosegregation and pipe formation are presented for two alloys under faster and slower cooling conditions.

Originality/value
– This model provides a comprehensive tool to investigate relationships between the developing composition distribution and shrinkage pipe formation.
PhotoBox focuses on employees' strengths
Authors: Farry Michael 
Published: February 2014

Purpose
– Reveals how line managers who play to their strengths and are noted for their positive leadership qualities are fostering a positive and energizing culture with high levels of accountability and performance at PhotoBox, a UK online photo service.

Design/methodology/approach
– Explains that PhotoBox managers took part in workshops combining a focus on personal growth and relevant skills development, in which core modules included a positive-leadership master-class and workshops on strengths coaching for results and engaging one-to-ones.

Findings
– Reveals that the master-class helped people to identify their unique strengths as a set of personal qualities that energize and lead to productive habits. The session also helped people to move from simple awareness of strengths to applying them in the role of manager. In turn, the groups created a shared vision for a more people-centric approach to leading across PhotoBox.

Research limitations/implications
– Explains that the new accent on personal strengths has benefited teamwork at the company, too.

Originality/value
– Spotlights how playing to individuals' strengths improves teamwork, communication and organizational performance.
Confidence that stops short of arrogance is the key to call-center success
Authors: Drake-Knight Nick 
Published: February 2014

Purpose
– Emphasizes the importance of self-confidence in sales people and reveals how these employees can achieve confidence in their call-center roles.

Design/methodology/approach
– Puts forward a series of spidergrams illustrating the self-confidence of different employees and suggests how they can improve their performance.

Findings
– Advances the view that sales people need to: know their products and services; know their sales and customer-service processes; know how to get inside the world of prospective customers; know their competitors' products and services; know what has worked, and not worked, in the past; and have faith and belief in the product, service and brand.

Practical implications
– Outlines development activities for call-center employees, concentrating on knowledge of product, sales process, customer-service processes, competitors' products and performance and the customer's world.

Originality/value
– Provides a tool-kit for developing call-center skills.
Twenty-one steps to successful leadership
Authors: Rao M.S. 
Published: February 2014

Purpose
– Presents 21 tools to coach future leaders.

Design/methodology/approach
– Highlights the effects of Baby Boomers leaving senior positions and prepares organizations to spot the characteristics of future leaders.

Findings
– Emphasizes the importance of setting a broad vision and developing a global mindset.

Practical implications
– Stresses the key role of learning continuously and of blending soft skills and business acumen, to achieve leadership excellence.

Originality/value
– Describes how to develop the leadership skills of tomorrow.
Investigation and assessment of photoluminescent embroidered elements
Authors: Radavičiene S. , Jucienė M. , Sacevičiene V. , Sacevičius R. , Otas K. 
Published: February 2014

Purpose
– The purpose of this paper is to determine conformity of geometrical parameters between the elements embroidered with photoluminescent threads and their digital images as well as to explore the change in photoluminescent radiation.

Design/methodology/approach
– Using some different methodologies and apparatus, analysis shape of embroidered elements conformity and photoluminescent luminance attenuation are analysed.

Findings
– The provided methodologies allow assessing the quality of embroidered elements area and photoluminescent properties.

Originality/value
– The proposed approach can be adjusted to investigate photoluminescent properties of embroidered elements of different filling types.
Designing of engineered fabrics using particle swarm optimization
Authors: Das S. , Ghosh A. , Banerjee D. 
Published: February 2014

Purpose
– The purpose of this paper is to design woven fabrics with desired quality and low manufacturing cost by optimizing the weave parameters such as count, crimp and thread spacing of warp and weft yarns.

Design/methodology/approach
– To fulfill this goal, the authors endeavor to devise a searching mechanism based on particle swarm optimization (PSO) for efficiently finding the appropriate combination of weave parameters.

Findings
– The experimental validation confirms that the proposed method has an excellent search capacity to obtain the best combinations of weave parameters for producing the fabrics with requisite quality at low cost.

Practical implications
– The quick response capability of the system would benefit the fabric manufacturers for efficient determination of the required weaving parameters to produce the engineered fabrics.

Originality/value
– This paper offers a maiden application of PSO technique to design engineered products in textiles. The method is easy to implement and it is computationally inexpensive as fewer parameters are involved.
Investigation into the feasibility of inductively coupled antenna for use in smart clothing
Authors: Suh Minyoung , E. Carroll Katherine , Grant Edward , Oxenham William 
Published: February 2014

Purpose
– This research investigated the feasibility of using an inductively coupled antenna as the basis of applying a systems approach to smart clothing. In order to simulate real-life situations, the impact of the distortions and relative displacement of different fabric layers (with affixed antennas) on the signal quality was assessed. The paper aims to discuss these issues.

Design/methodology/approach
– A spiral antenna was printed on different fabric substrates. Obstructive conditions of the inductively coupled fabric layers were investigated to find out how much influence these conditions had on transmission performance. Reflected signals and transmitted signals were observed, while fabric antennas were subjected to displacement (distance and dislocation) or deformation (stretching and bending). The threshold of physical obstacles was estimated based on statistical analyses.

Findings
– The limits of physical conditions that enable proper wireless transmission were estimated up to ∼2 cm for both distance and dislocation, and ∼0.24 K for bending deformation. The antenna performance remained within an acceptable level of 20 percent transmission up to 10 percent fabric stretch. Based on well-established performance metrics used in clothing environment on the body, which employs 2-5 cm of ease, the results imply that the inductively coupled antennas may be suitable for use in smart clothing.

Originality/value
– This research demonstrates that the use of inductively coupled antennas on multiple clothing layers could offer the basis of a new “wireless” system approach to smart clothing. This would not only result in performance benefits, but would also significantly improve the aesthetics of smart clothing which should result in new markets for such products.
Synthesis, characterization and tribological behavior of oleic acid-capped core-shell lanthanum borate-SiO2 composites
Authors: Jia Zhengfeng , Xia Yan-qiu , Shao Xin , Du San-ming 
Published: February 2014

Purpose
– The purpose of this paper is to investigate the tribological properties of poly-alpha-olefin (PAO) with nano/microstructure core-shell lanthanum borate-SiO2 composites (OCLS).

Design/methodology/approach
– Oleic acid-capped core-shell lanthanum borate-SiO2 composites were synthesized by an easy way. The composites were characterized by means of Fourier transform-infrared spectroscopy (FT-IR), transmission electron microscopy (TEM) and thermo gravimetric analysis (TGA). The friction and wear behaviors of the quenched AISI 1045 steel specimens sliding against AISI 52100 steel under the lubrication of PAO containing OCLS were comparatively investigated with PAO containing SiO2 additive on an Optimol SRV reciprocating friction and wear tester. On the other hand, the tribological properties of the PAO containing OCLS were also investigated on four-ball tester.

Findings
– The diameter of OCLS was about 20 nm, and the thickness of the SiO2 shell was less than 5 nm. The ratio of oleic acid (OA) is about 15 percent. The PAO containing OCLS possesses much better tribological properties than that of pure PAO and PAO containing SiO2 additive.

Originality/value
– The PAO+OCLS possess a better friction reducing and antiwear properties than pure PAO. The new additive can improve the tribological ability of machinery.
On frictional performance of sintering materials used by mechanical seals in water
Authors: Liu Ying , Zhao Xingyu , Wen Qingfeng , Wang Yuming 
Published: February 2014

Purpose
– It is aiming at finding tribology performance laws and mechanism of sintering materials, including new materials, which are popular or potential materials of mechanical seals working under water condition with different working parameters, involving load and sliding speed.

Design/methodology/approach
– Falex-1506 tribo-machine has been used. The upper sample is rotated against the stationary sample below. They are all rings. The samples are WNV2, sintered pressureless bonded; CHV1, graphite-added PLSiC; R, sintered reaction bonded; R2, graphite-added RBSiC, cemented carbide YN6 and graphite MSMG. Twenty kinds of hard/hard and soft/hard pairs were tested under water condition. Then, SEM was used to observe the sliding surface to explain their rubbing mechanism.

Findings
– Friction coefficients decrease with the load increasing under water lubrication due to water holding by small holes on their surface. But the friction coefficients have no change with the varying of velocity. The hard alloy/sintered silicon carbon pairs may be better choice, where the lowest friction coefficient is only about 0.02, than soft/hard or silicon carbon/silicon carbon pairs under water lubrication, especially under heavy load.

Research limitations/implications
– The test was carried under load from 89 N (0.7 MPa) to 356 N (2.80 MPa) and sliding velocity from 0.746 to 5.074 m/s where the lubrication is in mixed.

Originality/value
– The detailed values of frictional coefficients of popular and potential sintered material of mechanical seals working under water lubrication were given by the experimental research which may be helpful for the choice of mechanical seal materials.