bluuebunny/crossref_metadata_2025_split huggingface dataset:
Optimal Contracts for Intermediaries in Online Advertising
Authors: Balseiro Santiago R. , Candogan Ozan 
Published: June 2017

In online advertising, the prevalent method advertisers employ to acquire impressions is to contract with an intermediary. These contracts involve upfront payments made by the advertisers to the intermediary, in exchange for running campaigns on their behalf. This paper studies the optimal contract offered by the intermediary in a setting where advertisers’ budgets and targeting criteria are private. This problem can naturally be formulated as a multidimensional mechanism design problem, which in general is hard to solve. We tackle this problem by combining a performance space characterization technique, which relies on delineating the expected cost and value achievable by any feasible (dynamic) bidding policy, and a duality-based approach, which reduces the optimal contract design problem to a tractable convex optimization problem. This approach yields a crisp characterization of the intermediary’s optimal bidding policy: the policy is stationary and bids a weighted average of the values associated with different types (to guarantee that the advertiser reports her type truthfully) that is appropriately shaded (to account for budget constraints). Additionally, when advertisers have identical value distributions, our formulation yields a closed-form characterization of the optimal contract. Our results indicate that an intermediary can profitably provide bidding service to a budget-constrained advertiser and at the same time increase the overall market efficiency. The online appendix is available at https://doi.org/10.1287/opre.2017.1618 .
The selfie of the other: The Chinese dream in films and tourism
Authors: Li Dian , Luo Shuang 
Published: June 2017

Abstract
Lost in Thailand (Xu, 2012) and Finding Mr. Right (Xue, 2013) are two recent box office hits in China. Set in locales outside China, the films are designed to ride the wave of the country’s booming outbound tourism. The narrative of travel connects profoundly with the discourse of the Chinese Dream in that it reproduces the allure of economic prosperity and materialistic bliss. On the other hand, the films also bring into play the introspection that questions the very meaning of this dream, the cost of monetary excess and moral degradation in particular. In various intercultural encounters of the characters, the Chinese self is tested and constructed in familiar but reconstituted spectacles and symbols of global dimensions.
Ten Years: An exercise in negative identity in Hong Kong
Authors: Carrico Kevin 
Published: June 2017

Abstract
In late 2015 and early 2016, a low-budget independent film entitled Ten Years unexpectedly topped box office sales and provoked widespread discussion in Hong Kong. The film is composed of five fictional narratives from Hong Kong in 2025: false flag violence to force the passage of a national security law; a grocery owner harassed by Red Guard-like youth for using the banned term ‘local’ to describe his locally produced eggs; a taxi driver ostracized for his inability to speak the ‘national language’; and a self-immolator sacrificing herself in front of the British Embassy. These five distinct narratives coalesce around a common theme of anxiety about the political, cultural and social future of Hong Kong within the People’s Republic of China (PRC). How did these fictional scenarios come to dominate discussion on Hong Kong’s future in 2016? The symbols featured in Ten Years are not in any sense arbitrary: importantly, the blending of symbols from the two political spaces of Hong Kong and Mainland China in Ten Years enacts a shattering of the long-standing imaginarily immunizing political borders between the two spaces, thereby dramatically enacting the primary source of anxiety in Hong Kong politics and identity today: the idea of Hong Kong as just another PRC city. Yet beyond simply labelling China as an other and denouncing its colonization of Hong Kong, Ten Years engages in a sophisticated portrayal of identity politics that acknowledges the potential for anyone to participate in the ‘Mainlandization’ of Hong Kong, while attempting to avoid this outcome in its acknowledgement. In this sense, Ten Years presents an anti-essentialist and optimistically anti-teleological dystopia.
Preliminary evaluation of resorcinol-formaldehyde carbon gels for water pollutants removal
Authors: Zaini Muhammad Abbas Ahmad , Yoshida Seiichiro , Mori Takeshi , Mukai Shin R. 
Published: June 2017

Abstract
The present work was aimed to evaluate the suitability of resorcinol-formaldehyde carbon gels as adsorbent for water pollutants removal. The carbon gels were characterized using N2 adsorption-desorption isotherm for specific surface area, and Fourier transform infrared (FTIR) for surface functional groups. Methylene blue and cesium were employed as model water pollutants. Results show that the un-oxidized carbon gel, despite its lower specific surface area (333 m2/g) displayed a 118 mg/g removal of methylene blue, that is higher than 35 mg/g by the oxidized carbon gel (418 m2/g). The evaluation of adsorption kinetics revealed a lower pseudo-first order rate constant of 0.088 h-1 for 10 mg/L methylene blue adsorption. A positive effect of surface oxidation was demonstrated for cesium adsorption. On molar basis, however, the oxidized carbon gel exhibits a selective removal towards methylene blue compared to cesium. Carbon gel is a promising candidate for water pollutants removal, and further treatment needs to be sought to boost its performance.
Study of surface-enhanced infrared absorption spectroscopy (SEIRAS) of black inkjet prints using silver colloid
Authors: Oravec Michal , Miura Katsuya , Čeppana Michal 
Published: June 2017

Abstract
Only black inkjet prints were studied with regard to forensic examination of documents. We analysed twenty-one inkjet prints using surface-enhanced infrared absorption spectroscopy (SEIRAS). The present paper deals with micro-destructive document analysis based on silver nanoparticles (AgNPs) use to obtain surface enhanced ATR-FTIR (attenuated total reflection - Fourier transform infrared) spectra directly from the document. For this experiment, AgNPs in colloid form was applied. AgNPs for SEIRAS analyses were synthesised and afterwards analysed by scanning electron microscopy (SEM). The purpose of the enhancement of colloids was to improve the resolution of the absorption signal of the analysed samples from noise. In the experiment, the obtained ink ATR-FTIR spectra, with and without silver treatment, were significantly affected by the paper base.
Mobile devices and computing cloud resources allocation for interactive applications
Authors: Krawczyk Henryk , Nykiel Michał 
Published: June 2017

Abstract
Using mobile devices such as smartphones or iPads for various interactive applications is currently very common. In the case of complex applications, e.g. chess games, the capabilities of these devices are insufficient to run the application in real time. One of the solutions is to use cloud computing. However, there is an optimization problem of mobile device and cloud resources allocation. An iterative heuristic algorithm for application distribution is proposed. The algorithm minimizes the energy cost of application execution with constrained execution time.
Kolmogorov--Sinai entropy for p-preserving systems
Authors: Khare Mona , Shukla Anurag 
Published: June 2017

AbstractThe objective of the present paper is to develop a comprehensive theory of entropy in the realm of ags-space{(L,p)}involving the notion of a generalizeds-map, and to study dynamics of ap-preserving system{(L,p,\phi)}. It is obtained that the entropy ofp-preserving systems is isomorphism invariant, and also entropy of an invertiblep-preserving system vanishes provided the corresponding Rokhlin space admits a one-sided generator.
Variation of Static-PPP Positioning Accuracy Using GPS-Single Frequency Observations (Aswan, Egypt)
Authors: Farah Ashraf 
Published: June 2017

Abstract
Precise Point Positioning (PPP) is a technique used for position computation with a high accuracy using only one GNSS receiver. It depends on highly accurate satellite position and clock data rather than broadcast ephemeries. PPP precision varies based on positioning technique (static or kinematic), observations type (single or dual frequency) and the duration of collected observations. PPP-(dual frequency receivers) offers comparable accuracy to differential GPS. PPP-single frequency receivers has many applications such as infrastructure, hydrography and precision agriculture. PPP using low cost GPS single-frequency receivers is an area of great interest for millions of users in developing countries such as Egypt. This research presents a study for the variability of single frequency static GPS-PPP precision based on different observation durations.
Research of Biodegradable Fluid Impacts on Operation of Tractor Hydraulic System
Authors: Tkáč Zdenko , Čorňák Štefan , Cviklovič Vladimír , Kosiba Ján , Glos Josef , Jablonický Juraj , Bernát Rastislav 
Published: June 2017

Abstract
This paper is focused on the impacts of the biodegradable hydraulic and transmission fluid (Universal Tractor Transmission Oil) on operation of tractor hydraulic and transmission systems. The fluid was used in the hydraulic and transmission systems of a Zetor Proxima 6321 tractor. Fluid samples were taken from the Zetor Proxima 6321 tractor at intervals of 250 engine hours. These samples were subjected to an infrared spectroscopy analysis in order to measure the total acid number and perform the ferrography analysis. This paper proves minimal impacts of the biodegradable hydraulic fluid on operation of the Zetor Proxima 6321 tractor. The biodegradable fluid meets the requirements for the operation of agricultural tractors in terms of low impacts on the wear of hydraulic components.
Comparative Analysis of Access, and Preferences of Rural and Urban Households for Cooking Energy, and the Determinants in Nigeria: A Case of Ogun State
Authors: Elijah Obayelu Abiodun , Balikis Lawal Iyabode , Ambali Omotuyole Isiaka 
Published: June 2017

Abstract
This study identified and compared the use of cooking energy among rural and urban households in Ogun State, Nigeria using a sample of 300 households. Empirical results indicate that electricity and gas are the least sources of cooking energy in rural area (RA) while firewood and electricity are least in urban area (UA). The level of education of the respondents was a significant (P < 0.05) factor influencing the probability of using charcoal and electricity in the RA relative to firewood, while there is a tendency towards positivity using charcoal, kerosene and gas relative to firewood with household size in UA. In addition, distance to energy source (P < 0.05), and household income (P < 0.01) significantly determine energy use in UA. Probability of using charcoal, electricity was also found to be significantly (P < 0.01) influenced by occupation and price of the cooking fuel, respectively, in a negative direction. In the UA, both income and price significantly influence the use of gas while only price influences its usage in the RA. There is therefore the need for price reduction and promotion of interventions that will enable low income earner to use cleaner and environmentally friendly energy source.
An Investigation into Dynamic Puncture Resistance of the Polyester Needled Nonwoven Geotextiles using Video Processing Technique
Authors: Dehghan-Banadaki Zahra , Mashroteh Hasan , Ahmadi Mohammad Saleh 
Published: June 2017

Abstract
In this study, the dynamic puncture behavior of nonwoven needle-punched polyester geotextiles has been studied using video processing technique. Twenty-seven needle-punched geotextile samples were produced by changing areal weight, needle penetration depth and punch density as independent variables. Cone drop test was carried out on the samples. In addition to measuring the hole diameter (HD), the video processing technique with a high frame rate camera was employed to calculate the energy absorbed by geotextile fabric up to puncture point (Ep) and the hole expansion energy (Ee). Multiple linear regression method was used to develop the predicting relationships between independent and reply variables. The models showed that an increase in areal weight results in an increase in Ep, whereas it causes a decrease in Ee and HD. Moreover, increasing punch density and needle penetration depth, leads to less Ep, and more Ee and HD. In addition, it was also found that significant relationships exist for Ep-HD and Ee-HD.
New discrete reactive power factor definition of the two-terminal network
Authors: Siwczyński M. , Jaraczewski M. 
Published: June 2017

Abstract
This paper describes a new method of determining the reactive power factor. The reactive power factor herein is calculated on the basis of time samples and not] with the Fourier transform of signals, like it was done previously. The new reactive power factor calculation results from the receiver admittance-operator decomposition into the product of self-adjoint and unitary operators. This is an alternative decomposition to another one, namely into a sum of the Hermitian and skew-Hemiitian operators.
Bi-Level Optimization as a Tool for Implementation of Intelligent Transportation Systems
Authors: Stoilova Krasimira , Stoilov Todor , Ivanov Vladimir 
Published: June 2017

Abstract
The Intelligent Transportation System (ITS) is used as a term for integrating requirements and functionalities towards transportation systems, which in urban environment raises complex exploitation and control problems. Important part of the ITS is the control which has to be applied for traffic flows. The control processes are strongly linked with requirements and targets for optimization of the transportation behavior. The paper applies new optimization formal description of control by bi-level optimization. Except the trivial traffic lights control, the bi-level formalization allows additional traffic characteristics to be defined like maximal/minimal values. The paper defines, solves and provides numerical simulations for minimization of the vehicle queues in front of the traffic lights. Such bi-level optimization problem is applied simultaneously for maximization the traffic flows on arterial and important directions of the urban transportation network. The formal description of the bi-level problem is provided. The results of the bi-level control have been compared with the cases of single optimization of the vehicles queues. The simulation results prove that the bi-level problem gives benefits satisfying an additional goal, which improves additional characteristic of the transport behavior. The bi-level optimization formalism can be used as a tool for implementation of integration of ITS control policies.
Ultrasonic Positioning System Implementation and Dynamic 3D Visualization
Authors: Lazarov Andon , Minchev Dimitar , Dimitrov Atanas 
Published: June 2017

Abstract
The paper contributes to the design and implementation of the ultrasonic positioning system based on new multifunctional hardware components, newly released. A moving object coordinates’ determination is described analytically and a matrix equation in respect to unknown coordinates with coefficients, measurement distances, is derived. Stages of data packet processing are formulated, and a pseudo pyramid of measurement distances is built. HX7TR multifunctional ultrasonic devises, transceivers, are used to implement the positioning system. A C# program source code for coordinate determination and 3D visualization is created. The algorithm for moving object coordinate computation, and its program realization as well as HX7TR ultrasonic devises can be used in development of indoor ultrasonic positioning systems embedded in IoT and robotics applications.
An Environment for Automatic Test Generation
Authors: Stancheva Nina , Stoyanova-Doycheva Asya , Stoyanov Stanimir , Popchev Ivan , Ivanova Vanya 
Published: June 2017

Abstract
This paper presents an environment which generates tests automatically. It is designed for assistance in the software engineering education and is part of the Virtual Education Space. The environment has two functionalities – generation and assessment of different types of test questions. In the paper, the architecture of the environment is described in detail. The test generation is supported by specialized ontologies, which are served by two intelligent agents known as Questioner Operative and Assessment Operative.
A comparison of caspase 3 expression in the endocrine and exocrine parts of the pancreas after cladribine application according to the "leukemic" schema
Authors: Jasinski Ludwik , Chylinska-Wrzos Patrycja , Lis-Sochocka Marta , Wawryk-Gawda Ewelina , Jodlowska-Jedrych Barbara 
Published: June 2017

Abstract
The therapeutic effects of the immunosuppressive agent, cladribine, have been demonstrated by its toxicity to cells. However, its effects on healthy cells of the body is poorly understood. The aim of study was, hence, to, firstly, evaluate the morphology of the endocrine and exocrine pancreas after the administration of cladribine according to the "leukemic" schema, and, secondly, to assess its impact on the intensity of apoptosis. The experiment was carried out on female Wistar rats which were placed within the control group KA, and the experimental groups: A and A-bis. In the experimental groups, Cladribine was administered according to the cycle used to treat human hairy cell leukemia. In group A, the material was taken 24 hours after administration of the last dose of the drug, while in group A-bis, this was done after a 4 weeks break. The reaction was assessed to be average in 80% of all cells in group A, and in 64% of all acinar cells in group KA, while in group A-bis, the majority of the exocrine cells demonstrated a lack of immunohistochemical response (72%). Moreover, most endocrine cells (60%) in group A-bis revealed a strong reaction, while in Group A, the corresponding figure is a little over 34%. A comparison of the severity of the caspase 3 expression in both the exocrine and endocrine pancreas showed significant differentiation results between the group KA and group A-bis, and between group A and A-bis (p < 0.0001). In can be concluded that endocrine cells are more sensitive to cladribine than are exocrine cells.
Recent advances in corrosion resistant superhydrophobic coatings
Authors: Bahgat Radwan Ahmed , Abdullah Aboubakr M. , Alnuaimi Nasser A. 
Published: June 2017

AbstractExtreme water-repellent (superhydrophobic) coatings with water contact angle higher than 150° have caught the attention of corrosion researchers in the last decade as they can be used to protect metals and alloys against corrosion. The latter is a serious problem, as it can threaten human lives in addition to its deleterious effects on the economy and environment. Superhydrophobic coatings (SHCs) can be achieved by lowering the surface energy of a certain coating through combining some of its surface features at the microscale and nanoscales. Although SHCs can be prepared using many different easy techniques, none, to the best of our knowledge, has been applied, so far, on an industrial scale for protection against corrosion of metals and alloys. The present work explains the different models of superhydrophobic surfaces (SHSs) and reviews their fabrication and processing methods with a focus on the recent advances in the corrosion protection of the SHC.
Modular algorithm for reducing matrices to the Smith normal form
Authors: Cherepnev Mikhail A. 
Published: June 2017

Abstract
The paper gives a complete justification of the modular algorithm for reducing matrices to the Hermitian normal form, which enables one to construct a new modular algorithm for reducing to the Smith normal form that may simultaneously calculate the left matrix of the transformations. The main term in the estimate of the number of operations is 2(n
3 log D), where n is the size and D is the determinant (or a multiple of it) of the matrix under consideration.
Moral and aesthetic considerations of humanity according to the Polish philosopher Mieczysław Wallis
Authors: Zegzuła-Nowak Joanna 
Published: June 2017

Abstract
In this article, the author presents an overview of the 20th century Polish humanist Mieczysław Wallis who searches for answers to the question of the essence of humanity. The philosopher saw it in human axiological activities building a world of specifically human creations thus giving Man a meaningful existence. An axiological perspective of human subjectivity – the search for the purpose and meaning of human existence in the implementation of aesthetical and ethical values can be seen as a methodological proposal worthy of deeper consideration which could facilitate solving modern ethical and bio-ethical problems.
Degree of Faulting of Hard Coal Deposits of Upper Silesian Coal Basin
Authors: Marcisz Marek 
Published: June 2017

Abstract
The paper presents the results of research on the degree of faulting of deposits/mining areas of the Upper Silesian Coal Basin having been carried out since the 1970s. The results of these works are comprised of an analysis of the density of faults and an of the faulting index for 26 deposits/mining areas in the borders of the USCB. The statistical presentation of the problem includes three main parameters that characterize the tectonic complication of hard coal deposits in the borders of mining areas: lineal density GUL, surface density GUP and synthetic faulting index WU. The comparison of values of these parameters for particular deposits/mining areas was used for drawing up maps of their changes, whereas the results of the obtained view of variability have been interpolated and extrapolated to the borders of the entire basin. The results of the research showed that the values of GUL vary between 0.2 and 9.4 of faults/ m·10-3 and for all four analyzed directions: W-E, N-W, NW-SE i NE-SW, indicate a significant growing tendency in the following directions: N and NW and in SW. According to an analysis of GUP, it was stated that the largest part of the study area is occupied by the area in which there are no faults and the percentage of surface with GUP > 300 m/m2·10-4 is insignificant and does not have an essential influence on the rate and value of the faulting index. WU varies between 1.4 and 131.4 m/m2·10-4 (average for USCB: WU = 52.1 m/m2·10-4) and indicates a significant increasing tendency in the directions: N and NW as well as in the direction of SW. This determines the occurrence of USCB deposits of extreme different grade of tectonic complication in the borders: from not complicated (I grade) to very strongly complicated (VI grade).
Reduction of biomass resilience by torrefaction: apparent stiffness during failure (ASF) and specific failure energy (SFE) assessed by a custom impact device
Authors: Pierre Floran , Almeida Giana , Colin Julien , Perré Patrick 
Published: June 2017

AbstractThe present work focusses on the loss of resilience of torrefied wood as an indicator of its grindability. An impact device was developed to evaluate the mechanical behaviour of wood at high compression rates with a particular emphasis on the surface area of the particles produced. It allows the energy determination needed to produce particles without a traditional grinding test. Pine (Pinus pinaster) and oak (Quercus robur) were tested in radial (R) and tangential (T) directions and for various torrefaction intensities. With increasing heat intensity, the material becomes more fragile and finally loses its fibrous character, which increases the number of peak events on the stress/strain curve and significantly reduces the deformation energy. Two indices were derived from the experimental results: the apparent stiffness during failure (ASF) and the specific failure energy (SFE). These criteria allow the quantification of the loss of mechanical strength due to torrefaction, as well as the surface area increment of particles for a given grinding energy.