bluuebunny/crossref_metadata_2025_split huggingface dataset:
Reducing high-frequency ghost cavitation signals from marine air-gun arrays
Authors: Landrø Martin , Ni Yuan , Amundsen Lasse 
Published: April 2016

Ghost cavitation, which is a term describing that cavitation bubbles are generated acoustically, has been hypothesized to occur when the ghost reflected signals from many individual air guns beneath the sea surface produce a pressure that is close to zero in the water above the source array. Ghost cavitation is typically observed some milliseconds after the ghost reflection, and it may last for 5–15 ms, depending on the configuration of the source array. The cavitation process subsequently generates a weak high-frequency signal. To investigate this potential signal model and mechanism, we have performed a dedicated source experiment. We found that the distance between the source strings in a source array is a major factor that influences the amount and strength of the high-frequency signal. By increasing the separation distance from 6.5 to 8 m, we have observed a significant decrease in the high-frequency signal. Further, the amount of ghost cavitation can be reduced by increasing the distance between the guns. Also single sub-arrays may create ghost cavitation sound, of course weaker in signal strength compared with full arrays, in agreement with the model. Conventional air-gun modeling can be used to predict where ghost cavitation can occur. Therefore, in principle, a workflow could be developed to quantify grossly if and how much high-frequency signals could be generated by this mechanism, given the source array configuration, and further change the configuration to reduce to a very minimum the high-frequency signals, if deemed necessary. For an air-gun array consisting of two subarrays separated by 6 m and fired at 9 m depth, we found that the high-frequency signals emitted between 1 and 10 kHz were of similar strength to the noise from conventional cargo ships, depending on their size and the vessels’ speed.
Full-model wavenumber inversion: An emphasis on the appropriate wavenumber continuation
Authors: Alkhalifah Tariq 
Published: April 2016

A model of the earth can be described using a Fourier basis represented by its wavenumber content. In full-waveform inversion (FWI), the wavenumber description of the model is natural because our Born-approximation-based velocity updates are made up of wavefields. Our objective in FWI is to access all the model wavenumbers available in our limited aperture and bandwidth recorded data that are not yet accurately present in the initial velocity model. To invert for those model wavenumbers, we need to locate their imprint in the data. Thus, I review the relation between the model wavenumber buildup and the inversion process. Specifically, I emphasize a focus on the model wavenumber components and identified their individual influence on the data. Missing the energy for a single vertical low-model wavenumber from the residual between the true Marmousi model and some initial linearly increasing velocity model produced a worse least-squares fit to the data than the initial model itself, in which all the residual model wavenumbers were missing. This stern realization validated the importance of wavenumber continuation, specifically starting from the low-model wavenumbers, to higher (resolution) wavenumbers, especially those attained in an order dictated by the scattering angle filter. A numerical Marmousi example determined the important role that the scattering angle filter played in managing the wavenumber continuation from low to high. An application on the SEG2014 blind test data set with frequencies lower than 7 Hz muted out further validated the versatility of the scattering angle filtering.
Neda, martyrdom and the media event: Death imagery as an iconic memory
Authors: Ibrahim Yasmin 
Published: April 2016

Abstract
Death imagery online is a conflicted area of examination. At times it can assume a virality that will change public opinion creating iconic moments where death functions as a transformative device. The Internet with its ineradicable features to preserve content makes death a performance that can be consumed stripped of time and space. Death imagery becomes immortalized on the Internet defying the physical mortality of the body as a site of decay and decomposition. This article examines the death of Neda Agha-Soltan in Iran, exploring the entwined notions of witnessing and how the death event courted virality, immortalizing Neda as a global icon. The Internet became a site of double articulation where the act of dying was both contemporaneous and historical – captured, disseminated and consumed non-stop on the Internet. This temporal dislocation of the Internet means death as a media event can be both banalized as part of popular culture and equally consigned to the iconic; igniting affective communities that can domesticate death for collective grieving, communion and agency.
On the art of propaganda posters in post-revolutionary Ukraine: A review article
Authors: Mudrak Myroslava M. 
Published: April 2016

Abstract
Propaganda and Slogans: The Political Post er in Soviet Ukraine 1919–1921 (exhibition catalougue, The Ukrainian Museum, New Yo rk, 20 October 2013–2 February 2014, Intro. by guest curator, Myroslav Shkandrij, University of Manitoba) (2013) New York: The Ukrainian Museum, 68 pp., ISBN: 9780966062151, p/bk, $20 US
China, western art museums, and dissident art via social networks
Authors: Liljeblad Jonathan 
Published: April 2016

Abstract
Western art museums are increasingly assuming a political role on the international stage. An example of this is the controversy that arose between western art museums and the Chinese government over the arrest and detention of Ai Weiwei in 2011. This article interprets these controversies as reflective of an ongoing political discourse. This article seeks to inform this discourse from the perspective of the field of international relations, using contributions from political science to interpret situations over Chinese dissident art between western art institutions and the Chinese state, and generate descriptive and prescriptive suggestions for the future.
Self-affine Fractal Modelling of Aircraft Echoes from Low-resolution Radars
Authors: Sheng L. Q. , Pei J.H. , Liu X.Y. 
Published: April 2016

<p>For complex targets, the non rigid vibration of an aircraft as well as its attitude changes and the rotation of its rotating parts will induce complex nonlinear modulation on its echo from low-resolution radars. If one performs the fractal analysis of measures on an aircraft echo, it may offer a fine description of the dynamic characteristics which induce the echo structure. On basis of introducing self-affine fractal theory, the paper models real recorded aircraft echo data from a low-resolution radar using the self-affine fractal representation, and investigates the application of echo self-affine fractal characteristics in aircraft target classification. Results analysis shows that aircraft echoes from low-resolution radars can be modelled by using the self-affine fractal method, and the self-affine fractal features can be effectively applied to target classification and recognition.</p><p> </p>
Post Boost Track Processing Using Conventional DBMS Software
Authors: Basu Aniruddha 
Published: April 2016

<p>The design of air defence, traditional command control system is very challenging which has been used with basic methodologies. Traditional design is associated with unstructured and uncorrelated data and requires huge lines of code using hard disk drive (HDD) in the system. Hence an attempt was made for a better simplified database management system (DBMS) software data access methodology, which processed the incoming airborne data, message in RDBMS database to achieve full automation on real-time. The transaction is accomplished through SQL pass through method from the host decision making system into database. An algorithm of track identification during midcourse track separation was undertaken for prototype development on DBMS data access methodology. In this methodology Oracle C++ calls interface embedded query call was used from the host interface system. The purpose of this development was to find a comparison of online process timing between HDD and SSD using commercial database, and to evaluate performance of dynamic processing of RDBMS Database for identification of target vehicle and booster after separation. Produced experimentation results from improved performance of the proposed methodology on which futuristic command control system can rely.</p><p> </p>
Effect of Nano Cr2O3 in HTPB/AP/Al Based Composite Propellant Formulations
Authors: Kshirsagar Dhirendra , Kurva Ramesh , Dhabbe Kashinath , Jawale Lalita , Singh Sudhir , Khire Vrushali , Maurya Mehilal 
Published: April 2016

<p>Different compositions have been prepared by incorporating nano sized chromium oxide from 0.25 % to 1 % in HTPB/AP/Al based composite propellant formulation having 86% of solid loading and studied its effect on viscosity build-up, thermal, mechanical and ballistic properties. The findings reveal that on increasing the percentage of nano Cr2O3 in the composition, there is an increase in end of mix viscosity, elastic modulus and tensile strength while elongation decreases accordingly. The data on thermal properties envisage the reduction in thermal decomposition temperature of ammonium perchlorate as well as formulations based on HTPB/AP/Al. The data on ballistic properties reveal that there is an enhancement in burning rate from 6.11 mm/s to 7.88 mm/s at 6.86 MPa, however, marginal increase in pressure exponent (‘n’ values) from 0.35 to 0.53 with 1 wt % of nano Cr2O3 was observed in comparison to reference composition without chromium oxide. </p><p> </p>
Virtual Prototyping and Development of Rotary Field Ferrite Phase Shifter
Authors: Aggarwal Meenakshi , Matheru B.S. 
Published: April 2016

<p>Review of the virtual prototyping and physical development of the rotary field ferrite phase shifter is presented. A description of the basic principle of operation of the rotary field ferrite phase shifter has been given along with the key aspects about the design and virtual prototyping of various parts of the phase shifter viz ferrite rod, yoke, polarisers and matching section using HFSS and 3-D Maxwell softwares. Calibrated simulation performance of the phase shifters is presented and it shows good agreement with physical measurement results. Three prototypes and one hundred production capable phase shifter modules were fabricated, functionally tested and RF characterised. This is an indigenous development of the physical prototypes of rotary field class of ferrite phase shifters of C-band. This class of ferrite phase shifters finds application in phased array radars, such as battery level radar and weapon locating radar, because of its high phase accuracy and high power handling capability.</p><p> </p>
Circular Patch Antenna with Defected Ground for UWB Communication with WLAN Band Rejection
Authors: Jangid K. G. , Tiwari Ajay , Sharma Vijay , Kulhar V.S. , Saxena V.K. , Bhatnagar D. 
Published: April 2016

<p>The design and performance of coplanar waveguide fed modified circular patch antenna for possible application in ultra wideband communication systems with band rejection for upper wireless local area network band (5.15 GHz - 5.85 GHz) is reported. This antenna is designed on glass epoxy FR4 substrate having size 30 mm × 20 mm × 1.59 mm. The coplanar waveguide fed circular patch antenna is modified by introducing L shaped slits in ground plane and U shaped slot in patch and performance analysis of antenna is simulated by applying CST microwave studio simulation software. Different designed antennas were tested with available experimental facilities. The developed end product shows a nice matching with feed network at frequencies 2.62 GHz, 3.94 GHz and 8.50 GHz and provides 10.38 GHz (3.33 GHz - 13.71 GHz) impedance bandwidth with wireless local area network 5.5 GHz (4.74 GHz - 6.15 GHz) band rejection. The co and cross polar patterns in elevation and azimuth planes at two frequencies namely 2.62 GHz and 3.94 GHz are obtained which dictate that co-polar patterns are significantly better than cross polar patterns. The simulated peak gain of antenna is close to 3.86 dBi and gain variation with frequency shows a sharp gain decrease in the frequency range 4.74 GHz to 6.15 GHz.</p><p> </p>
Control Flow Graph Based Multiclass Malware Detection Using Bi-normal Separation
Authors: Kapoor Akshay , Dhavale Sunita 
Published: April 2016

<p>Control flow graphs (CFG) and OpCodes extracted from disassembled executable files are widely used for malware detection. Most of the research in static analysis is focused on binary class malware detection which only classifies an executable as benign or malware. To overcome this issue, CFG based multiclass malware detection system that automatically classifies the malware into their respective families is proposed. The use Bi-normal separation (BNS) as a feature scoring metric. Experimental results show that proposed method using BNS outperforms compared to hitherto use technique of document Frequency for multiclass metamorphic malware detection and achieves detection accuracy of 99.5 per cent.</p><p> </p>
Energy Efficient MANET Protocol Using Cross Layer Design for Military Applications
Authors: Rath Mamata , Pattanayak Binod Kumar , Pati Bibudhedu 
Published: April 2016

<p>In military applications mobile adhoc network plays very important role because it is specifically designed network for on demand requirement and in situations where set up of physical network is not possible. This special type of network which takes control in infrastructure less communication handles serious challenges tactfully such as highly robust and dynamic military work stations, devices and smaller sub-networks in the battle field. Therefore there is a high demand of designing efficient routing protocols ensuring security and reliability for successful transmission of highly sensitive and confidential military information in defence networks. With this objective, a power efficient network layer routing protocol in the network for military application is designed and simulated using a new cross layer approach of design to increase reliability and network lifetime up to a greater extent.</p><p> </p>
Quality Metrics and Reliability Analysis of Laser Communication System
Authors: Raj A. Arockia Bazil , Padmavathi S. 
Published: April 2016

<p class="Abstract">Beam wandering is the main cause for major power loss in laser communication. To analyse this prerequisite at our environment, a 155 Mbps data transmission experimental setup is built with necessary optoelectronic components for the link range of 0.5 km at an altitude of 15.25 m. A neuro-controller is developed inside the FPGA and used to stabilise the received beam at the centre of detector plane. The Q-factor and bit error rate variation profiles are calculated using the signal statistics obtained from the eye-diagram. The performance improvements on the laser communication system due to the incorporation of beam wandering mitigation control are investigated and discussed in terms of various communication quality assessment key parameters.</p><p class="Abstract"> </p>
Multiple Results of Damped Systems with General Nonlinearities
Authors: Chen Guanwei , Li Lin , Sun Jijiang 
Published: April 2016

Abstract
We study a class of non-periodic damped systems, where the nonlinearity H is subquadratic at 0 and general at infinity (i.e., it can be subquadratic, asymptotically quadratic or superquadratic at infinity, three examples are constructed to illustrate the three different cases). Besides, the global evenness condition (

H
⁢

(
t
,

-
u

)

=

H
⁢

(
t
,
u
)

${H(t,-u)=H(t,u)}$

) and the global non-negative condition (

H
⁢

(
t
,
u
)

≥
0

${H(t,u)\geq 0}$

) used before are, respectively, replaced by the local evenness condition (

H
⁢

(
t
,

-
u

)

=

H
⁢

(
t
,
u
)

${H(t,-u)=H(t,u)}$

,

|
u
|

≤
r

${|u|\leq r}$

) and the local non-negative condition (

H
⁢

(
t
,
u
)

≥
0

${H(t,u)\geq 0}$

,

|
u
|

≤
r

${|u|\leq r}$

). Under the above weaker and more general conditions, we obtain infinitely many nontrivial small negative energy homoclinic orbits for this class of damped systems by an extension of Clark’s theorem.
Quasilinear Elliptic Equations with Singular Nonlinearity
Authors: do Ó João Marcos , da Silva Esteban 
Published: April 2016

Abstract
In this paper, motivated by recent works on the study of the equations which model electrostatic MEMS devices, we study the quasilinear elliptic equation

(Pλ)

{

-

(

r
α

⁢

|

u
′

|

β

⁢

u
′

)

′

=

λ
⁢

r
γ

⁢
f
⁢

(
r
)

(

1
-
u

)

2

,

r
∈

(
0
,
1
)

,

0
≤

u
⁢

(
r
)

<
1

,

r
∈

(
0
,
1
)

,

u
′

⁢

(
0
)

=

u
⁢

(
1
)

=
0

.

${}\begin{cases}-(r^{\alpha}|u^{\prime}|^{\beta}u^{\prime})^{\prime}=\dfrac{% \lambda r^{\gamma}f(r)}{(1-u)^{2}},&r\in(0,1),\\ 0\leq u(r)<1,&r\in(0,1),\\ u^{\prime}(0)=u(1)=0.&\end{cases}$

According to the choice of the parameters α, β, and γ, the differential operator which we are dealing with corresponds to the radial form of the Laplacian, the p-Laplacian, and the k-Hessian. We prove the existence of an extremal parameter

λ
∗

>
0

${\lambda^{\ast}>0}$

such that, for

λ
∈

(
0
,

λ
∗

)

${\lambda\in(0,\lambda^{\ast})}$

, there exists a minimal solution

u
¯

λ

${\underline{u}_{\lambda}}$

and, for

λ
>

λ
∗

${\lambda>\lambda^{\ast}}$

, there exists no solution of any kind. We also study the behavior of the minimal branch of solutions and we prove uniqueness of solutions of (

P

λ
∗

$P_{\lambda^{\ast}}$

) for

β
>

-
1

${\beta>-1}$

.
Combined Effects of Concave-Convex Nonlinearities in a Fourth-Order Problem with Variable Exponent
Authors: Baraket Sami , Rădulescu Vicenţiu D. 
Published: April 2016

Abstract
We study two classes of nonhomogeneous elliptic problems with Dirichlet boundary condition and involving a fourth-order differential operator with variable exponent and power-type nonlinearities. The first result of this paper establishes the existence of a nontrivial weak solution in the case of a small perturbation of the right-hand side. The proof combines variational methods, including the Ekeland variational principle and the mountain pass theorem of Ambrosetti and Rabinowitz. Next we consider a very related eigenvalue problem and we prove the existence of nontrivial weak solutions for large values of the parameter. The direct method of the calculus of variations, estimates of the levels of the associated energy functional and basic properties of the Lebesgue and Sobolev spaces with variable exponent have an important role in our arguments.
The Revolution Will Be Performed. Cameras and Mass Protests in the Perspective of Contemporary Art
Authors: Ruchel-Stockmans Katarzyna 
Published: April 2016

Abstract
This article offers an analysis of Videograms of a Revolution (1992) by Harun Farocki and Andrej Ujica and The Pixelated Revolution (2011) by Rabih Mroue, which both reflect on the role of amateur recordings in a revolution. While the first deals with the abundant footage of the mass protests in 1989 Romania, revealing how images became operative in the unfolding of the revolution, the second shows that mobile phone videos disseminated by the Syrian protesters in 2011 respond to the desire of immediacy with the blurry, fragmentary images taken in the heart of the events. One of the most significant results of this new situation is the way image production steers the comportment of people involved in the events. Ordinary participants become actors performing certain roles, while the events themselves are being seen as cinematic. This increased theatricality of mass protests can thus be seen as an instance of blurring the lines between video and photography on the one hand and performance, theatre and cinema on the other.
The Intermedial Cluster: Åke Hodell’s Lågsniff
Authors: Bäckström Per 
Published: April 2016

Abstract
Avant-garde aesthetic movements react on and appropriate new technological media in a process of breaking down the boundaries between different media and different “arts," in an attempt to generate meaning from the sheer materiality of the artwork. Avant-garde artworks will therefore by necessity be marked by media in different ways, at the same time as these art forms are processual, performative and transgressive. One of the prime Swedish examples of this avant-garde strategy is Ake Hodell’s many realizations of his manuscript Lågsniff. The manuscript, written in 1963, was in the form of a text-sound-composition, which means that Lågsniff, already in this form, took many configurations with a plurality of genres and media modalities involved. Later the manuscript was realized as a series of performances, a TV-film, a book, and in 2002 as a DVD. For such a collection of art works, I would like to suggest the term “intermedial cluster.” The point of departure for my discussion is the DVD, a remediation of the TV- film from 1966, and I will focus on two of the juxtaposed discourses in the cluster that this DVD represents: the package tour and warfare, and on two thematic foci in the film: media and memory, and man as automaton.
Moving Picture, Lying Image: Unreliable Cinematic Narratives
Authors: Csönge Tamás 
Published: April 2016

Abstract
By coining the term “unreliable narrator” Wayne Booth hypothesized another agent in his model besides the author, the implicit author, to explain the double coding of narratives where a distorted view of reality and the exposure of this distortion are presented simultaneously. The article deals with the applicability of the concept in visual narratives. Since unreliability is traditionally considered to be intertwined with first person narratives, it works through subjective mediators. According to scholarly literature on the subject, the narrator has to be strongly characterized, or in other words, anthropomorphized. In the case of film, the main problem is that the narrator is either missing or the narration cannot be attributed entirely to them. There is a medial rupture where the apparatus mediates the story instead of a character’s oral or written discourse. The present paper focuses on some important but overlooked questions about the nature of cinematic storytelling through a re-examination of |the lying flashback in Alfred Hitchcock's Stage Fright. Can a character-narrator control the images the viewer sees? How can the filmic image still be unreliable without having an anthropomorphic narrator? How useful is the term focalization when we are dealing with embedded character-narratives in film?
How Long and When: Open Time Interval and Dignified Living Creatures in The Turin Horse
Authors: Selyem Zsuzsa 
Published: April 2016

Abstract
László Krasznahorkai wrote two different texts (the second being the script of Béla Tarr’s film) from two different perspectives starting from the well-known scene in Turin, Italy, where Friedrich Nietzsche embraced a horse beaten severely by the carter. Why does the interpretation of the Nietzsche-scene change? What kind of temporal, historical or ethical relationship does the differentiation between the two texts depend on? How can the beauty of the crumbs of life be perceivable? This article argues that in these works - in contrast with the commonly assumed precognitions about apocalyptic art - life and humble living creatures are celebrated.