bluuebunny/crossref_metadata_2025_split huggingface dataset:
The Archimedean projection property
Authors: Coll Vincent , Dodd Jeff , Harrison Michael 
Published: June 2017

Abstract
Let H be a hypersurface in ℝ
n
and let π be an orthogonal projection in ℝ
n
restricted to H. We say that H satisfies the Archimedean projection property corresponding to π if there exists a constant C such that Vol(π
–1(U)) = C·Vol(U) for every measurable U in the range of π. It iswell-known that the (n–1)-dimensional sphere, as a hypersurface in ℝ
n
, satisfies the Archimedean projection property corresponding to any codimension 2 orthogonal projection in ℝ
n
, the range of any such projection being an (n – 2)-dimensional ball. Here we construct new hypersurfaces that satisfy Archimedean projection properties. Our construction works for any projection codimension k with 2 ≤ k ≤ n – 1, and it allows us to specify a wide variety of desired projection ranges Ω

n–k
⊂ ℝ
n–k
. Letting Ω

n–k
be the (n – k)-dimensional ball for each k, it produces a new family of smooth, compact hypersurfaces in ℝ
n
satisfying codimension k Archimedean projection properties that includes, in the special case k = 2, the (n – 1)-dimensional spheres.
Ricci solitons on four-dimensional Lorentzian Walker manifolds
Authors: Sidhoumi Noura , Batat Wafaa 
Published: June 2017

Abstract
We prove that there exist non-trivial (i.e. not Einstein) Ricci solitons on non-conformally flat four-dimensional Lorentzian Walker manifolds. Moreover, we show that only steady Ricci solitons may be gradient ones.
Criteria for Hattori–Masuda multi-polytopes via Duistermaat–Heckman functions and winding numbers
Authors: Cho Mi Ju , Kim Jin Hong , Lee Hwa 
Published: June 2017

Abstract
A multi-fan (respectively multi-polytope), introduced first by Hattori and Masuda, is a purely combinatorial object generalizing an ordinary fan (respectively polytope) in algebraic geometry. It is well known that an ordinary fan or polytope is associated with a toric variety. On the other hand, we can geometrically realize multi-fans in terms of torus manifolds. However, it is unfortunate that two different torus manifolds may correspond to the same multi-fan. The goal of this paper is to give some criteria for a multi-polytope to be an ordinary polytope in terms of the Duistermaat–Heckman functions and winding numbers. Moreover, we also prove a generalized Pick formula and its consequences for simple lattice multi-polytopes by studying their Ehrhart polynomials.
Magnetic characterization of the nickel layer protecting the copper wires in harsh applications
Authors: Roger Daniel , Duchesne Stephane , Iosif Vadim 
Published: June 2017

Abstract
High Temperature (HT°) motor coils open new perspectives for extending the applications of electrical motors or generators to very harsh environments or for designing very high power density machines working with high internal temperature gradients. Over a temperature of 300°C, the classic enameled wire cannot work permanently, the turn-to-turn insulation must be inorganic and made with high temperature textiles or vitro-ceramic compounds. For both cases, a diffusion barrier must protect the copper wire against oxidation. The usual solution consists of adding a nickel layer that yields an excellent chemical protection. Unfortunately, the nickel has ferromagnetic properties that change a lot the skin effect in the HT wire at high frequencies. For many applications such as aeronautics, electrical machines are always associated with PWM inverters for their control. The windings must resist to high voltage short spikes caused by the fast fronted pulses imposed by the feeding inverter. The nickel protection layer of the HT° inorganic wire has a large influence on the high frequency behavior of coils and, consequently, on the magnitude of the voltage spikes. A good knowledge of the non-linear magnetic characteristics of this nickel layer is helpful for designing reliable HT inorganic coils. The paper presents a method able to characterize non-linear electromagnetic properties of this nickel layer up to 500°C.
Statistical analysis and dimensioning of a wind farm energy storage system
Authors: Waśkowicz Bartosz 
Published: June 2017

AbstractThe growth in renewable power generation and more strict local regulations regarding power quality indices will make it necessary to use energy storage systems with renewable power plants in the near future. The capacity of storage systems can be determined using different methods most of which can be divided into either deterministic or stochastic. Deterministic methods are often complicated with numerous parameters and complex models for long term prediction often incorporating meteorological data. Stochastic methods use statistics for ESS (Energy Storage System) sizing, which is somewhat intuitive for dealing with the random element of wind speed variation. The proposed method in this paper performs stabilization of output power at one minute intervals to reduce the negative influence of the wind farm on the power grid in order to meet local regulations. This paper shows the process of sizing the ESS for two selected wind farms, based on their levels of variation in generated power and also, for each, how the negative influences on the power grid in the form of voltage variation and a shortterm flicker factor are decreased.
Optimized design of a high-power-density PM-assisted synchronous reluctance machine with ferrite magnets for electric vehicles
Authors: Liu Xiping , Li Ya , Liu Zhangqi , Ling Tao , Luo Zhenhua 
Published: June 2017

AbstractThis paper proposes a permanent magnet (PM)-assisted synchronous reluctance machine (PMASynRM) using ferrite magnets with the same power density as rareearth PM synchronous motors employed in Toyota Prius 2010. A suitable rotor structure for high torque density and high power density is discussed with respect to the demagnetization of ferrite magnets, mechanical strength and torque ripple. Some electromagnetic characteristics including torque, output power, loss and efficiency are calculated by 2-D finite element analysis (FEA). The analysis results show that a high power density and high efficiency of PMASynRM are obtained by using ferrite magnets.
Implementation of mathematical model of thermal behavior of electronic components for lifetime estimation based on multi-level simulation
Authors: Frivaldsky Michal , Pridala Michal , Drgona Peter 
Published: June 2017

Abstract
The main purpose of the paper is the proposal of multi-level simulation, suited for the evaluation of the lifetime of critical electronic devices (electrolytic capacitors). The aim of this issue is to imagine about the expected operation of complex and expensive power electronic systems, when the failure of the most critical component occurs. For that reason, various operational conditions and various physical influences must be considered (e.g. mechanical, humidity, electrical, heat stress), where nonlinearities are naturally introduced. Verification of the proposal is given, whereby the life-time estimation of an electrolytic capacitor operated in a DC-DC converter during various operational conditions is shown. At this point electrical and heat stress is considered for lifetime influence. First, the current state in the field of mathematical modeling of the lifetime for electrolytic capacitors, considering main phenomena is introduced. Next, individual sub-models for multi-level simulation purposes are developed, including a thermal simulation model and electrical simulation model. Several complexities of individual models are mutually compared in order to evaluate their accuracy and suitability for further use. Proper simulation tools have been mutually linked and data transfer was secured, in order to have the possibility of investigation of a lifetime depend on the changes of various variables.
Influence of the rotor eccentricity on the torque of a cage induction machine
Authors: Silwal Bishal , Rasilo Paavo , Belahcen Anouar , Arkkio Antero 
Published: June 2017

AbstractThe non-uniform air gap in an electrical machine caused by rotor eccentricity creates an asymmetrical flux-density distribution in the air gap. This can affect the nominal torque produced by the machine. Eccentricity also produces forces that act on the rotor which may also have an effect on the torque. Thus, it is important to know how the torque of the machine behaves. In this paper, the torque of a cage induction machine is studied when the machine has dynamic eccentricity. The study is performed using the finite element method and a magnetic vector potential formulation. The torque is calculated by the method of energy balance. The harmonic components of the torque are also analyzed. The results show that the machine under eccentricity does not exhibit the same torque as a normal healthy machine. The harmonic components around the first principal slot harmonic is most affected.
The model of double-cage induction motor for the analysis of thermal fields in transient operations
Authors: Mróz Jan 
Published: June 2017

AbstractEmergency motor switch-on happens occasionally while operating a doublesquirrel- cage motor at full supply voltage with the rotor blocked (e.g., in coal mills). After releasing the blockage, the by now heated motor is started up again. However, the mechanical stress caused by the increased temperature poses considerable hazards to the squirrel-cage winding. This paper presents a double-cage induction motor model for analysis of thermal fields in transient operation. The thermal field for the rotor of a doublesquirrel- cage motor of soldered or cast structure, operating in the conditions described, has been calculated in the present paper using a thermal network method. Measurement results have been presented for the double-squirrel-cage winding temperature for a soldered cage construction in the blocked rotor state.
Scaling-based prediction of magnetic anisotropy in grain-oriented steels
Authors: Najgebauer Mariusz 
Published: June 2017

AbstractThe paper presents the scaling-based approach to analysis and prediction of magnetic anisotropy in grain-oriented steels. Results of the anisotropy scaling indicate the existence of two universality classes. The hybrid approach to prediction of magnetic anisotropy, combining the scaling analysis with the ODFs method, is proposed. This approach is examined in prediction of angular dependencies of magnetic induction as well as magnetization curves for the 111-35S5 steel. It is shown that it is possible to predict anisotropy of magnetic properties based on measurements in three arbitrary directions for φ = 0°, 60° and 90°. The relatively small errors between predicted and measured values of magnetic induction are obtained.
Competitive Strategies of Croatian Small Familyrun Hospitality and Catering Enterprises
Authors: Perkov Davor , Merkaš Zvonko , Crnkić Kenan 
Published: June 2017

Abstract
The subject of this paper is examining ways of creating strategic competitiveness in Croatian small family-run catering enterprises. Competitive advantage is necessary if the enterprise wants to survive on the market. Selection of a business strategy is an important factor because a company’s positioning is determined by profitability that can be above or below the industry average. Economic reality of the largest number of the world’s economies is characterized by domination of family-run businesses. This is followed by the growing interest in determining the importance of family-run businesses to national economies, the ways of their participation, and finding problems which they have to deal with. Family entrepreneurship represents a special area of small entrepreneurship in Croatia. This work presents core characteristics of entrepreneurship in Croatia, defined as family-run enterprise, along with its features, with special interest on some of the more important characteristics of family entrepreneurship. The main goal of this paper is to examine and analyze all the features of business strategies that generate a competitive advantage. An empirical online survey was conducted in 2015 among sixty Croatian small family-run catering enterprises. Over 40% of respondents believe that the government should facilitate an easier and more long-term administration for entrepreneurs. Research has also shown that the sustainability of competitive advantage lies in adapting to guest wishes.
Is Contemporary Tourism Only a Neoliberal Manipulation?
Authors: Pavlović Duško , Knežević Mladen 
Published: June 2017

Abstract
Increased number of tourists traveling abroad has been on a steady rise for several decades. However, an explosion of tourist travel can be followed from the end of the 1960’s. This trend largely coincides with the development of the neoliberalist form of capitalism in the world. Therefore, modern tourism, in many ways, can be seen as the product of neo-liberal phase of the development of modern capitalism. This trend is not seen only as a result of neo-liberal phase in the development of the modern world economy. This is a trend for mindedness itself. One of the most important rules that underlie the contemporary neoliberal thought is the rule of market. It seems that this neoliberalist rule in the tourist industry has reached its peak. The market in tourism regulates not only goods production, but it fully regulates the lives of people involved in tourism. Consumers of tourist products are not aware of manipulation, they are even grateful for the manipulative activities of which thay are object. On the other hand, many tourists themselves are part of the general neoliberal mentality. Many tourists not only accept the rules, but are also deeply involved in their implementation and enforcement. The paper will make an overview of some of the basic features of neoliberalism as economic thought and philosophy of life and connect it with contemporary trends in tourism.
Flexible tissue-like electrode as a seamless tissue-electronic interface
Authors: Weigel Tobias , Pfister Tobias , Schmitz Tobias , Jannasch Maren , Schürlein Sebastian , Hijailan Reem Al , Walles Heike , Hansmann Jan 
Published: June 2017

AbstractCurrent implantable electrodes facilitate only a low cellular infiltration impairing the long-term integration into the host’s tissue. To accomplish a seamless electronic-tissue interface, conductive three-dimensional (3D) scaffolds were generated by carbonization of electro-spun fiber meshes. When introducing NaCl particles as porogens, tailored tissue-like electrodes were generated. Characterization of the porous 3D fiber electrodes demonstrated improved material and electrical characteristics compared to standard carbon fiber meshes or flat gold surfaces. The feasibility of the porous 3D electrodes was assessed by cell culture experiments, confirming the migration of cells into the electrode and the formation of contracting cardiomyocyte clusters. Finally, a complex cardiac co-culture system proved the integration of the tissue into the 3D electrode in long-term culture of 7 weeks. These results strengthen the development of tissue-like 3D scaffolds as alternative to two-dimensional (2D) electrodes.
Combining Ideas in Crowdsourced Idea Generation
Authors: Wang Kai , Wang Hui , Tao Yu 
Published: June 2017

Abstract
Collecting ideas through crowdsourcing has become a common practice for companies to benefit from external ideas and innovate. It is desirable that crowd members build on each other's ideas to achieve synergy. This study proposes and verifies a new method for idea combination which can result in combined ideas that are both novel and useful. The domain-specific knowledge of crowd members does not influence the effectiveness of such idea combination. The new method can be used for collecting highly creative ideas from the crowd. The implications for future research are discussed.
Physical fitness and obesity levels during an academic year followed by summer holidays: an issue of insufficient time for physical activity
Authors: Aphamis George , Ioannou Yiannakis , Giannaki Christoforos D. 
Published: June 2017

Abstract
Today, available time for physical activity has been continuously decreasing, whilst, school-time physical education (PE) classes appear to be the only real option for many adolescents to engage in physical activity and exercise. The aim of the present study was to investigate fitness and health related parameters over one academic year, and after the summer holidays for adolescents who do not engage in out-of-school physical activities. Participants were 153 students (age: 15–17 years; boys n = 86) who exercised only during PE (2 × 45-min periods per week). Body fat, flexibility, handgrip strength, squat jump, 30 m sprint and cardiorespiratory fitness were examined at the beginning and end of a school year, and after the ensuing summer holidays. The boys improved handgrip and flexibility, but no other significant improvement was observed over the school year in any of the examined physical fitness parameters, or obesity indices. Instead, the girls’ cardiorespiratory fitness decreased over the summer holidays. It seems that exercising only twice a week during school PE classes is insufficient to induce significant improvements in physical fitness, body composition and health parameters.
Improving adolescent access and services in a large primary care network: report of a 10 year project
Authors: Alderman Elizabeth M. , Freeman Kim L. , Lobach Katherine S. 
Published: June 2017

Abstract
This report describes a decade long initiative to bring a unified approach and improved quality to the process and content of adolescent health care in a large and complex urban primary care network within an academic health system. The moving force was a voluntary multidisciplinary group who comprised the Montefiore Adolescent Primary Care Initiative, known as MAPCI, led by a physician subspecialist in Adolescent Medicine. A series of needs assessments formed the basis for a multipronged effort to create policies and procedures, educational activities and materials, changes in record-keeping and billing practices, and modification of staff attitudes and behavior that would enhance access and ensure confidentiality of services for the adolescent age group. The commitment of medical center leadership contributed to overall progress which was accelerated in the second half of the decade by the addition of a full-time staff member, with the title Adolescent Program Manager. Progress in various arenas was assessed with a series of planned studies, whose positive results provided encouragement for continuing efforts. The example of this initiative and its accomplishments should provide useful and replicable methods that could be adapted for improvement of adolescent health services in some of the other large primary care networks that are an ever-expanding presence in the current health care environment.
Indigenous Tewa language regimes across time: Persistence and transformation
Authors: Kroskrity Paul V. 
Published: June 2017

AbstractThis article attempts to trace and understand the historical development and transformation of the regimes of language Indigenous to the Village of Tewa (northeastern Arizona). It examines the social institutions and cultural practices that first cultivated a particular set of language ideologies and linguistic practices in the precolonial period. It also tracks more recent transformations involving contemporary Tewa adaptations to inclusion in the federally recognized Hopi Tribe and to the hegemony of the larger nation-state. Critical to my argument is the role of theocratic institutions and Indigenous social organization (e.g., clans and moieties) in providing a foundation for ideological production and elaboration. This account provides a better analysis of Tewa linguistic resistance to Spanish colonization than that of Edward Dozier, who attributed language contact outcomes to the historical circumstances of Spanish colonial oppression rather than to the expression of Indigenous language ideologies, including their regimes of temporalization and the crossing of temporal borders in subjective history.
Changing livelihoods and language repertoires: hunting, fishing and gold mining in the southeast Peruvian Amazon
Authors: Aikman Sheila 
Published: June 2017

AbstractThis article investigates how over the space of three decades the language repertoires of the Arakmbut people of the southeast Peruvian Amazon have shifted from being predominantly Harakmbut language based to Spanish language based. It asks not how one language has come to replace another in the daily lives of the Arakmbut, but what this shift represents in terms of changing lifestyles, social relations, desirable affiliations and the changing value Harakmbut and Spanish language resources have for them in furthering these relationships. Drawing on long term ethnographic research, it presents four scenarios over this period through which the changes in Arakmbut livelihoods from hunting and fishing to gold mining are discussed and what these changes mean in terms of their social, cultural and spiritual relationships with their territory. As their livelihoods have become more entwined with the gold economy and new national alliances and international networks, they have sought to reshape their communicative repertoires to respond to and ensure their continuing access to resources for their health and stability as a community in an intense and fast moving social, economic and cultural landscape.
Phytochemical analysis of Myrtus communis plant: Conventional versus microwave assisted-extraction procedures
Authors: Bouaoudia-Madi Nadia , Boulekbache-Makhlouf Lila , Kadri Nabil , Dahmoune Farid , Remini Hocine , Dairi Sofiane , Oukhmanou-Bensidhoum Sonia , Madani Khodir 
Published: June 2017

Abstract

Background
Myrtle (Myrtus communis L) may constitute an interesting dietary source of health protective compounds. Microwave-assisted extraction (MAE) of total phenolic compounds (TPC) from myrtle leaf, stems, pericarp, and seeds was studied and the results were compared with those of the conventional method extraction (CME) in terms of extraction time.

Methods
Extraction yield/efficiency and antioxidant activity were measured using radical scavenging assay (DPPH•) and reducing power.

Results
The results show that the MAE was higher in terms of saving energy, extraction time (62 s) and extraction efficiency of bioactive compound compared to CME (2 h). Leaf presented the optimum content of total phenols (250 mg GAE.g−1 DW) and flavonoids (13.65 mg GAE.g−1 DW). However, the anthocyanin content was most important in pericarp extract (176.50±2.17 mg Cyd-3-glu g−1 DW). The antioxidant activity was important in all parts, mainly in leaves. The results indicated that appropriate microwave treatment could be an efficient process to phenolic compounds recovery and thus, better the antioxidant activity of myrtle extract.

Conclusions
Principal component analysis (PCA) applied to the experimental data shows that the distribution of the myrtle phenolic compounds depended on their plant part localization as well as the extraction method.