bluuebunny/crossref_metadata_2025 huggingface dataset:
Conceptualizing the impact of perceived organizational support and psychological contract fulfillment of employees paradoxical intentions of stay and leave
Authors: Saood Akhtar Muhammad , Mohd Salleh Lailawati , Hisham Ghafar Nor , AhmedKhurro Mansoor , Adal Mehmood Sultan
Published: March 2018

The article presents a comprehensive and detailed conceptual framework on the effects of employees’ perceived organizational support on their paradoxical intentions of leaving to and staying with the organization in Psychological Contract Perspective. This study anticipates proposing an applicable technique to examine empirically the interrelationships of employees’ perceived organizational support, psychological contract fulfillment, intention to stay and intention to leave.This paper proposes theory-based path model, and possible interrelationships of related constructs such that the future analysis would be based on related statistical methods may include structural equation modeling approach.Although numerous researchers have studied the broad topics of perceived organizational support and employees’ turnover intentions, none of those studies has explored the paradoxical and differential impact of perceived organizational support on the intentions of staying and leaving. The innovative propositions using psychological contract fulfillment lenses in the relationship of perceived organizational support with the intention to stay and intention to leave, as explained by psychological contract perspective of social exchange theory would be the originality of this paper and possible contribution to the body of knowledge.
A scientific review of soft-computing techniques and methods for stock market prediction
Authors: R. Islam Muhammad , F.T. Al-Shaikhli I , Abdulkadir A
Published: March 2018

Information could be power if most technological approach engaged in the era of IT.  Web based text mining is one of the approach that could be analyzed in many ways through soft-computing methods and techniques. The analytical result has shown that different methods of text mining have several advantages with the gap of knowledge that is required to improve. This paper explores the performance of various methods and its impact on specific text mining field such as web based financial text analysis for stock prediction. Key research area of financial text mining is becoming one of the potential research field based on the source of online news, forums, blogs or social media.
Analysis determinants of social media acceptance in higher educational institutes of Pakistan
Authors: Raza Ali , Murad Chandio Shah , Imtaiz Ali Najma , Solangi Zulfiqar , Shah Asadullah , Faiz Ahmed Syed
Published: March 2018

Seen through the lens of the educational sector, social media grew to become a vital source of academic learning. The learning through social media occurs mainly through the collaborative approach to information sharing, where the web-based social networking sites provide the optimal platform for knowledge enhancing among colleagues, co-workers, and others. Developed economies have already recognized the significant value of learning through social media. However, developing economies such as Pakistan did not yet interpret future implications and real benefits of social media aided learning. This research focuses on determining significant factors through an integrated framework that features broadly recognized technology models such as Technology acceptance model (TAM) and Innovation diffusion theory (IDT). The subjects of the framework testing were students in higher education institutions that use social media, and the sample size was 350 students. Data analysis results, reached via SPSS software, were substantially in favour of extended model. Results reached through this study, in terms of factors with a significant influence on social media acceptance rate in Pakistani higher education institutions, are particularly crucial for students in the field of education, located in developing countries. This should assist the increasing acceptance and use of technological solutions, benefiting both faculty and students.
Hybrid method for automatic extraction of multiword expressions
Authors: Agrawal Shaishav , Sanyal Ratna , Sanyal Sudip
Published: March 2018

A three phase hybrid method for automatic extraction of English multiword expressions (MWEs) has been proposed. The proposed method is based on linguistic patterns, association and context similarity between constituent words of the MWEs. First, the expressions are extract-ed in the form of N-grams from the raw text and then filtered using well defined linguistic patterns. Next, these expressions are again fil-tered using association score and context similarity score between their constituent words. Two association measures, Dice’s coefficient and PMI have been used for calculating the association score. The context similarity between words has been calculated using Latent Semantic Analysis (LSA) method. The problem of deciding the best value for the cut-off boundary thresholds in statistical methods is quite common. A two phase method of deciding the boundary threshold, using training dataset, has been proposed and employed in the current work. De-tailed performance analysis has been done on manually annotated dataset. The significant gain in performance has been observed for various types of multiword expressions.
A hybrid active queue management technique for QoS based unicasting protocols in MANETs
Authors: Mahapatro Susrita , Kumar sahu Prabhat , Kumar Dash Pradeep
Published: March 2018

Mobile Ad hoc Networks (MANETs) is the interconnection of several self-energy dependent mobile nodes. It is one of the self-configured and infrastructure less network. In MANET the issues are security, Quality Of Services, Congestion etc. The major issue of MANET is to control the congestion. Congestion means the network capacity is larger than the no of packets transmitted across the network.  In this paper, an effort has been made to evaluate and analyze the performance of the network by means of comparing two on-demand reactive routing protocols such as AODV [Ad-hoc On-demand Distance Vector] and DSR [Dynamic Source Routing] with each other along with also by comparing with DSDV [Destination Sequenced Distance Vector], which is a proactive routing protocol. The comparison is also being made under the light of two queue management techniques such as RED (Random Early Detection) and Droptail. A gateway discovery algorithm is being used by both AODV and DSR routing protocols, which uses the mechanism of connecting mobile nodes through gateway, however Bellman-Ford algorithm is being used by DSDV which uses the concept of including freedom from loops in the routing table. By means of simulation through NS-2 network simulator by varying the number of nodes, we observe that the performance differentials of AODV, DSR, and DSDV routing protocols are directed to foremost performance differentials to guarantee QoS for both of these protocols in RED and Droptail queue management techniques. There is a lot of queue management approach to minimize the congestion rate and transfer the data successfully to the destination. Two queue management techniques popularly used to manage queues in MANets are Active queue management and Passive queue management. Active queue management is widely used and RED is the most popular approach which gives low average delay, high throughput and lower packet drop rate. But RED algorithms have some drawback. So here we are using a hybrid approach, named as MRED by means of combining the features of both RED and ECN to overcome the drawbacks of RED.
Comparative study of NoSQL databases for big data storage
Authors: Bathla Gourav , Rani Rinkle , Aggarwal Himanshu
Published: March 2018

Big data is a collection of large scale of structured, semi-structured and unstructured data. It is generated due to Social networks, Business organizations, interaction and views of social connected users. It is used for important decision making in business and research organizations. Storage which is efficient to process this large scale of data to extract important information in less response time is the need of current competitive time. Relational databases which have ruled the storage technology for such a long time seems not suitable for mixed types of data. Data can not be represented just in the form of rows and columns in tables. NoSQL (Not only SQL) is complementary to SQL technology which can provide various formats for storage that can be easily compatible with high velocity,large volume and different variety of data. NoSQL databases are categorized in four techniques- Column oriented, Key Value based, Graph based and Document oriented databases. There are approximately 120 real solutions existing for these categories; most commonly used solutions are elaborated in Introduction section. Several research works have been carried out to analyze these NoSQL technology solutions. These studies have not mentioned the situations in which a particular data storage technique is to be chosen. In this study and analysis, we have tried our best to provide answer on technology selection based on specific requirement to the reader. In previous research, comparisons amongNoSQL data storage techniques have been described by using real examples like MongoDB, Neo4J etc. Our observation is that if users have adequate knowledge of NoSQL categories and their comparison, then it is easy for them to choose best suitable category and then real solutions can be selected from this category.
Hypercube optimization based global solution in numerical benchmark and sensor localization
Authors: R.Sujatha S , Siddappa M
Published: March 2018

An original learning algorithm for solving global numerical optimization problems is proposed. The proposed algorithm is strong stochastic search method which is based on evaluation and optimization of a hypercube and is called the hypercube optimization (HO) algorithm. The hypercube optimization algorithm includes the initialization and evaluation process, and searching space process. The designed HO algorithm is tested on specific benchmark functions. The comparative performance analysis have made against with other approaches of dynamic weight particle swarm optimization and self-adaptive differential evolution algorithm. Convergence characteristics of self-adaptive differential evolution algorithm has deliver the much better functional   value in compare to dynamic weight based particle swarm optimization.
Centralized real-time logs investigation in virtual data-center
Authors: Vinay Gatla , Pavan Kumar T
Published: March 2018

Penetration testing is a specialized security auditing methodology where a tester simulates an attack on a secured system. The main theme of this paper itself reflects how one can collect the massive amount of log files which are generated among virtual datacenters in real time which in turn also posses invisible information with excessive organization value. Such testing usually ranges across all aspects concerned to log management across a number of servers among virtual data centers. In fact, Virtualization limits the costs by reducing the need for physical hardware systems. Instead, require high-end hardware for processing. In the real-time scenario, we usually come across multiple logs among VCenter, ESXi, a VM which is very typical for performing manual analysis with a bit more time-consuming. Instead of configuring secure-ids automatically in a Centralized log management server gains a powerful full insight. Along with using accurate search algorithms, fields searching, which includes title, author, and also content comes out of searching, sorting fields, multiple-index search with merged results simultaneously updates files, with joint results grouping automatically configures few plugs among search engine file formats were effective measures in an investigation. Finally, by using the Flexibility Network Security Monitor, Traffic Investigation, offensive detection, Log Recording, Distributed inquiry with full program's ability can export data to a variety of visualization dashboard which exactly needed for Log Investigations across Virtual Data Centers in real time.
A Method for finding threated web sites through crime data mining and sentiment analysis
Authors: V. Daya Sagar K , Shyam Krishna Ch , Lalith Kumar G , Surya Teja P , Charless Babu G
Published: March 2018

This paper has been withdrawn.
Support vector machine in the anticipation of currency markets
Authors: Lalithendra Nadh V , Syam Prasad G
Published: March 2018

Various researchers have done an expansive research within the domain of stock market anticipation. The majority of the anticipated models is confronting some pivotal troubles because of the likelihood of the market. Numerous normal models are accurate when the data is linear. In any case, the expectation in view of nonlinear data could be a testing movement. From past twenty years with the progression of innovation and the artificial intelligence, including machine learning approaches like a Support Vector Machine it becomes conceivable to estimate in light of nonlinear data. Modern researchers are combining GA (Genetic Algorithm) with SVM to achieve highly precise outcomes. This analysis compares the SVM and ESVM with other conventional models and other machine learning methods in the domain of currency market prediction. Finally, the consequence of SVM when compared with different models it is demonstrated that SVM is the premier for foreseeing.
Pattern classification of interstitial lung disease in high resolution clinical datasets: A systematic review
Authors: Ummay Atiya S , V.K Ramesh N
Published: March 2018

Automated tissues characterization helps to diagnosis the various diseases including Interstitial lung diseases (ILD). The various features and the several classifiers are used in categorize the different layers depend on the pattern presented in the image. The different types of diseases may occur in the lungs and some of the diseases happen to leave the scars. These scars can be found in the High Resolution Computed Tomography (HRCT) and have different pattern. The different diseases cause the different pattern in the images and these is classified using the efficient classifier that helps to diagnosis the diseases. In this paper, review for the many researches regarding to the classification of the different pattern from the Computed Tomography (CT) images is presented. The evaluation of the efficiency of the methods in terms of classifier and database used for the research is made. The Deep Convolution Neural Network (CNN) provides the promising classifier efficiency compared to the other researches for different pattern. In general, there are five types of pattern is classified: Healthy, ground glass, honeycomb, Fibrosis, and emphysema.
Android based real time advance security for parking system in IOT
Authors: Venkata Sai Kasturi Babu CH , Athuluri Manikanta , Venkatram N
Published: March 2018

In recent trends traffic has become a major problem in most of the cities. There are limited car parking facilities and less road safety precautions observed. So, to address the traffic problems are being made in the field of IoT.    This paper will present the basic idea of cloud-based parking system. Cloud will store and process the data between device and mobile. In cloud, stored files will be obtained from anywhere through the network connection. By using the latest technology called IoT for smart cities, we can book the parking slot of a vehicle from anywhere. We need to take registration details for reserving the parking slot and for security purpose we are generating an OTP. By using the OTP, we can book our slot through an android application.
Privacy preserving proof of ownership for data in cloud storage systems
Authors: Tirapathi Reddy B , V. P. Chandra Sekhara Rao M
Published: March 2018

Storing data in cloud has become a necessity as users are accumulating abundant data every day and they are running out of physical storage devices. But majority of the data in the cloud storage is redundant. Data deduplication using convergent key encryption has been the mechanism popularly used to eliminate redundant data items in the cloud storage. Convergent key encryption suffers from various drawbacks. For instance, if data items are deduplicated based on convergent key, any unauthorized user can compromise the cloud storage by simply having a guessed hash of the file. So, ensuring the ownership of the data items is essential to protect the data items. As cukoo filter offers the minimum false positive rate, with minimal space overhead our mechanism has provided the proof of ownership.
A comprehensive study on protection, control and communication techniques: a key concept for microgrid intelligent operation
Authors: Mahesh C , T.Josh F , Sanjeevi Gandhi A
Published: March 2018

Microgrid is an integrated network of renewable and non renewable resources to supply the green power to a small range of community. An effective communication technology is necessary to be implemented among the power generations, storages and loads of microgrid in order to manage the load sharing, shedding and protection issues. This paper provides the study on architecture, characteristics, load managements, protection schemes, communication techniques and research challenges of microgrid.
Information extraction in current Indian web documents
Authors: Bhanu Prakash Kolla
Published: March 2018

Communication and Internet are two major resources in today’s technical, social and scientific disciplines offering a wide range of possibilities in bringing in new approaches and variations in current ones. Web documents are increasingly growing in size, volume and time, bringing in the need to access and process them off and online over the Internet with a PC or a smart phone. When viewed in Indian context, web documents pose different kinds of challenge and the present study addresses some of them taking into account the vagaries in the Indian languages. This has become very relevant in Indian education scenario, where bilingual and multi-lingual communication and web documents through on-line courses, are being generated. When regional native dialect comes into picture, another dimension of complexity is added. After presenting the different kinds of web pages in the Indian perspective, the case for the development of a generic approach id highlighted so that it can blend with current tools of data mining and at the same time cater to vagaries in Indian texts. The approach based on a pixel level addressing of data-which is of large size-, is later modified and reduced to numerical equivalents using matrix manipulations so that they form inputs to some classification approaches, like statistical, pattern matching and neural models. Some typical case studies on text letters and words are presented to highlight the generality of approach and its flexibility to fit into different tools.
Development of real time environment monitoring system using with MSP430
Authors: Kommuri Krishnaveni , Venkata Ratnam K , Prathyusha Geetha , Gopi Krishna P
Published: March 2018

This paper specifies about the monitoring environmental parameters regularly to forecast the weather prediction. Nowadays, Weather prediction plays a vital role for citizens living in the coastal areas. Mostly the parameters of the weather prediction vary to different fields and areas which hep the agricultures and travelers. This application makes the system more reliable, accurate, and flexible and dynamically varies the parameters of environment. We mainly consider the two factors; one is to acquire the parameter value accurately and second is to monitor continuously acting with reliability. The Environmental parameters considered in this paper are temperature and humidity, atmospheric pressure and light intensity. The MSP430 Micro controller observes the parameters by which the threats can be easily identified by the users and get alerted from the situations.
Low cost real time braille keypad for communication
Authors: Prabha.P Lakshmi , EJ Sanjanamenon , Samuel Christina , Ramesh Ganga
Published: March 2018

Visually impaired people find it challenging to use devices such as computers, and other digital/educational software like every normal person does in this technology driven world. Due to their inability to gainaccess to basic and vital information they sometimes feel excluded from the society and also limit their knowledge. Several attempts have beenmade in the recent years toimprove their communication methods such as tactile sign language, Braille glove, and Audioacces devices so on. This paper suggests an innovative assistive device, a Braille keypad, for the viually impaired that would help them use computers just like a normal person. The Braille keypad implements the Braille cells as 6 switches that can be pressed simultaneously based on the actual Braille combination in order to type a particular letter and words. The corresponding letters/words are displayed as well as can be heard by the user. A text to speech algorithm is implemented using puTTY software which would help the user confirm what he/she has typed is right. In this way it enables them to interact and communicate as well as use computers and mobile phones much like a normal person.
Comparison between unit cell and plane strain models of stone column ground improvement
Authors: Gaber Maryam , Kasa Anuar , Abdul Rahman Norinah , Alsharef Jamal
Published: March 2018

This article presents a comparative study of the behaviour of clayey soil reinforcements using stone column ground improvement by means of numerical analyses. Two-dimensional finite element analyses with commercially available software, PLAXIS, were performed on end-bearing stone columns using 15-noded triangular elements to investigate the impact of the modelling type on the stress concentration ratio and failure mechanism of an improved foundation system. Consolidation analyses were conducted throughout the study using Mohr-Coulomb’s criterion. The computed values of the stress concentration ratios were compared for different key parameters, including the diameters of stone columns, c/c spacing of columns, friction angle of stone column material, and undrained cohesion of soft soil. The major conclusions of this study were that the stone column in the unit cell model shared between 2.5 to 3.14 times more loads than the surrounding soil, whilst in the plane strain model it shared between 1.7 to 2.9 times more loads. The use of plane strain approach to model the stone column gave a more comprehensive representation of the stress distribution and load transfer between the soil and columns, in addition to being a better method than the unit cell concept to evaluate the failure mode in this system.
Vegetation growth impacts conveyance efficiency of irrigation canals - a geo-drone approach
Authors: Kulkarni A. A. , Nagarajan R.
Published: March 2018

In spite of canals are most important conveyance systems for delivering water for irrigation in the alluvial plains of India, many irrigation canal projects are suffering from massive growth aquatic plants along the canal sides known as aquatic weeds and siltation along canal bed. Aquatic weeds are unwanted plants playing a very important role in different eco-systems and many of them cause enormous direct and indirect losses. The losses include interference with the cultivation of crops, loss of biodiversity, loss of potentially productive lands, loss of grazing areas and livestock production, erosion following fires in heavily invaded areas, choking of navigational and irrigation canals and reduction of available water in water bodies. Also, it has been found that it severely reduces the flow capacity of irrigation canals thereby reducing the availability of water to the farmers. The vegetation on bottom and sides of the canal increases the roughness resulted into a decrease in velocity which further leads to silt deposition on canal bed which affects the canal functions. The complexity of these situations has resulted in a need for identification of impact of weeds on the hydraulic efficiency of canals. For accurate identification of weeds, low altitude drone survey becomes an innovative solution than other conventional methods. This study captured vegetation along the canal using the drone images and estimated roughness shows, the reduction in conveyance efficiency by 21.90% compared with design data.
Experimental thermal analysis and modelling of single point lathe cutting tools without cooling effect
Authors: Agarwal A. , Letsatsi M.T , Seretse O.M. , Marumo R.
Published: March 2018

This study investigated the use of tungsten carbide tool and high speed steel (HSS) tool when machining aluminum and mild steel. The parameters such as feed and speed of rotation were varied in order to observe their effect on machining operation. The experiments were performed without a coolant. FLIR thermo Cam P60 and Infra-Red Camera were used to record the observations. The highest temperature were recorded when feed rate was 2 mm. A comparison of experiments shows that HSS tooling produced high temperatures when machining mild steel. At 625 rev/min HSS failed when cutting mild steel at 2 mm feed rate. It was generally observed that temperatures generated between a tool and work piece is a function of feed rate, speed of rotation and tool material. These observations can aid the selection of a tool before a machining operation.
Analysis of transformer less inverter for PV applications
Authors: R Selvamathi , V Indragandhi , L Ashok kumar
Published: March 2018

To enhance the effectiveness and decrease the cost of a Photovoltaic (PV) system, the utilization of transformer less PV inverters is an option of expanding interest. In any case, this topology should be considered in detail, as it shows a few issues like effectiveness degradation and safety issues identified with the galvanic association between the system and the PV generator.In this research paper, a review of standalone and grid-connected PV inverter structures has been done. From one viewpoint, a few options in light of established structures have been introduced. At last parasitic capacitance in PV arrays and leakage current produced from PV systems are examined.
Influence of Spinal and General Anesthesia on Newborn’s Status
Authors: Ivanov Emilija , Karadzova Dafina , Nikolovski Sotir , Sivevski Atanas , Curlinov Kiro , Zlatkova Milica , Dimitrov Goran
Published: March 2018

Introduction. The number of caesarean sections has drastically increased and thus arose the idea to examine the effect of the type of anesthesia on the neonates. The objective was to compare vital parameters in the neonates, born under general and spinal anesthesia.

Method. A total of 120 patients with need for caesarean section have been divided in two groups of 60, of which the first was lead in general and the second one in spinal anesthesia. The first one was given propophol (2.0-2.5 mg/kg/tt) and succinil colin (1-1.5 mg/kg/tt). The anesthesia was lead with fentanil 0,005 mg/kg/tt and rocuronium bromide 0.4-0.6 mg/kg/tt. O2:N2O was 3:3 l/min. The second group was lead in spinal anesthesia. 2-3 ml Bupivacain 0.5% was spinally applied between L2-L3. Apgar score was defined in the neonates in the first and fifth minutes. The acido-basic status of the neonate was examined through pH values in the blood and the base excess.

Results. In the first minute after birth giving with Apgar, 8 newborns 37(61,67%) were born to the group of patients with SA and 29 (48.33%) to the group of patients with GA. In 11 (18.33%) newborns born to the patients led with SA had Apgar score of 9-10, while only 3 (5%) of the newborns born to the patients led with GA had Apgar score of 9-10. Similar ratio was noted in the fifth minute after birth. Ph of the newborns’ blood as well as the base excess (BE) demonstrated significantly lower values in the group of patients led with SA than in the group of patients led with GA. Ph = 7.33 vs 7.37; BE=-4.57±1.8 vs -2.96±2.3.

Conclusion. The newborns from the second group had significantly higher Apgar scores than those in the first group. The newborns’ relative acidose (lower SpO2and BE) did not affect the newborns’ Apgar score in the first and fifth minute.
Two-Stage Revision for Infected Knee Endoprosthesis
Authors: Ciriviri Jasmin , Talevski Darko , Nestorovski Zoran , Vraniskovski Tode , Pechinkova-Misevska Snezana
Published: March 2018

Introduction. Two-stage revision surgery for infected knee endoprosthesis using antibiotic articulating spacer is the best possible standard in most of the orthopedic centers worldwide.

Methods. In the period from 2008 to 2012 we treated 21 patients with infected knee endoprosthesis. We used a single protocol for diagnosis and treatment of infection which included x-ray examination, serological examination (sedimentation and CRP), fine needle aspiration of the joint with further microbiological and biochemical examination of the smear. The surgical treatment was consisted of taking samples for microbiological and histological examination, removing the implanted endoprosthesis and excision of the avascular and necrotic tissue, implantation of articular antibiotic spacer. The postoperative steps included administration of parenteral antibiotics according to the previously made antibiogram in a two-week period followed by two oral antibiotics (ciprofloxacin and rifampicin) in the next four to six weeks. The second-stage procedure was performed when there were no clinical and serological signs of infection. Removing of the antibiotic spacer and implanatation of primary or revision prosthesis according to bone deficit was performed.

Results. In one patient the procedure was carried out three times, arthrodesis of the knee joint was made in one patient and in nineteen patients reimplantation was performed. One patient after reimplanation had reinfection after 6 months. The follow-up period of the patients was 36 months. The functional results according to the Knee society score: preoperative 36, postoperative 74.

Conclusion. Two-phase treatment is satisfactory in treatment of periprosthetic joint infection. Articulated antibiotic loaded bone cement spacer is superior in eradication of local infection. It allows partial function of the joint and makes easier the second surgical intervention. Infection with Staphylococcus aureus is difficult to be treated with a higher percent of recidives.
Efficiency enhancement of natural dye sensitized solar cell by optimizing electrode fabrication parameters
Authors: Hossain M. Khalid , Pervez M.F. , Tayyaba S. , Uddin M. Jalal , Mortuza A.A. , Mia M.N.H. , Manir M.S. , Karim M.R. , Khan Mubarak A.
Published: March 2018

Efficiency of dye-sensitized solar cell (DSSC) depends on several interrelated factors such as type and concentration of dye, type and thickness of photoelectrode and counter electrode. Optimized combination of these factors leads to a more efficient cell. This paper presents the effect of these parameters on cell efficiency. TiO2nanoporous thin films of different thicknesses (5 μm to 25 μm) were fabricated on indium doped tin oxide (ITO) coated glass by doctor blading method and characterized by inverted microscope, stylus surface profiler and scanning electron microscope (SEM). Natural organic dye of different concentrations, extracted from turmeric, was prepared with ethanol solvent. Different combinations of dye concentrations and film thicknesses along with different types of carbon catalyst have been investigated by I-V characterization. The result shows that the cell made of a counter electrode catalyst material prepared by candle flame carbon combined with about 15 μm thick photoelectrode and 100 mg/mL dye in ethanol solvent, achieves the highest efficiency of 0.45 %, with open circuit voltage of 566 mV and short circuit current density of 1.02 mA/cm2.
Ultrasound assisted green synthesis of cerium oxide nanoparticles using Prosopis juliflora leaf extract and their structural, optical and antibacterial properties
Authors: Arunachalam Thirunavukkarasu , Karpagasundaram Muthukumaran , Rajarathinam Nithya
Published: March 2018

Cerium oxide nanoparticles (CONPs) were prepared using ultrasound assisted leaf extract of Prosopis juliflora acting as a reducing as well as stabilizing agent. The synthesized CONPs were characterized by ultraviolet-visible absorption spectroscopy (UV-Vis), particle size analyzer (PSA), Fourier transform infrared spectroscopy (FT-IR), Raman spectroscopy, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and high-resolution transmission electron microscopy (HRTEM). From the UV-Vis analysis, the optical band gap of the prepared CONPs (Eg = 3.62 eV) was slightly increased as compared to the bulk ceria (Eg = 3.19 eV). The phytochemicals in the extract reduced the particle size to 3.7 nm ± 0.3 nm, as it is evident from the PSA. FT-IR results confirmed the Ce-O stretching bands by showing the peaks at 452 cm-1. The Raman spectrumshowed a characteristic peak shift for CONPs at 461.2 cm-1. XRD analysis revealed the cubic fluorite structure of the synthesizednanoparticles with the lattice constant, a of 5.415 Å and unit cell volume, V of 158.813 Å3. XPS signals were used to determine the concentration of Ce3+ and Ce4+ in the prepared CONPs and it was found that major amount of cerium exist in the Ce4+ state. HRTEM images showed spherical shaped particles with an average size of 15 nm. Furthermore, the antibacterial activity of the prepared CONPs was evaluated and their efficacies were compared with the conventional antibiotics using disc diffusion assay against a set of Gram positive (G+) bacteria (Staphylococcus aureus, Streptococcus pneumonia) and Gram negative (G-) bacteria (Pseudomonas aeruginosa, Proteus vulgaris). The results suggested that CONPs showed antibacterial activity with significant variations due to the differences in the membrane structure and cell wall composition among the two groups tested.
Application of radio frequency inductively coupled plasma in chemical vapor deposition process of diamond-like carbon films for modification of properties of deposited films
Authors: Kijaszek Wojciech , Oleszkiewicz Waldemar , Znamirowski Zbigniew
Published: March 2018

The authors have deposited the diamond-like carbon (DLC) films by radio frequency inductively coupled plasma enhanced chemical vapor deposition (RF ICP PECVD) method. The investigated DLC films with different sp3 fraction content were deposited on polished and textured silicon substrates. The sp3 fraction content of the deposited DLC films was ranging from 35 % to 70 % and was estimated from acquired Raman scattering spectra (excitation wavelength: 325 nm and 514.5 nm). The measurements of field emission characteristics were carried out in diode configuration. Emission properties of the DLC films were calculated from Fowler-Nordheim plots. The calculated electric field enhancement factor β was ranging from 56 to 198 for the DLC films deposited on polished substrates and from 115 to 445 for films deposited on textured substrates. The surface of the DLC films was observed by scanning electron microscope (SEM) after field emission measurements. The acquired SEM images reveled that the activation of field emission from the DLC films is connected with generation of structural damage to the DLC films.
Electronic structure and effective masses of TlInSe2 under pressure
Authors: Orudzhev G.S. , Ismayilova N.A. , Jafarova V.N.
Published: March 2018

We have studied the band structure and the band gap closure of TlInSe2 under pressure in the range of 0 GPa to 21 GPa, by employing the first-principles method based on the density functional theory. We discuss the possible metallic transition in the tetragonal phase of TlInSe2 crystal. Our calculation results show that the value of the pressure at the crossover from the direct to the indirect gap is found to be 8 GPa. The “semiconductor-metal” transition is determined to occur at 14 GPa. The study of the pressure effect on the effective masses for semiconductor state shows that with increasing pressure, the effective masses of holes and electrons decrease and the anisotropy of effective masses of holes is weakening.
Crystal structure of bis(1-(phenylsulfonyl)-2-(1-(pyrazin-2-yl)ethylidene)hydrazin-1-ido-κ3
N,N′,O)nickel(II), C24H22N8O4S2Ni
Authors: Wu Hao , Wu Wei-Na
Published: March 2018

C24H22N8O4S2Ni, orthorhombic, Aba2 (no. 41), a = 11.845(6) Å, b = 21.937(11) Å, c = 9.907(5) Å, V = 2574(2) Å3, Z = 4, R
gt(F) = 0.0285, wR
ref(F
2) = 0.0657, T = 296(2) K.
The Role of Trust in Political Systems. A Philosophical Perspective
Authors: Weinert Friedel
Published: March 2018

The paper analyzes the question of whether trust is an essential condition for the functioning of social and political systems; it approaches the issue from a philosophical perspective. Trust appears in both interpersonal relationships (interpersonal trust) and in societal and political institutions (social and political trust, respectively). In the political literature trust is sometimes characterized as ‘an expectation of continued value’. Although the same literature distinguishes social from political trust, the thesis advanced here is that, logically, all forms of trust must be characterized as an inductive generalization from past experience to future expectations of the continuation of some specifiable utilities (goods, services). As such, trust suffers from Humean reservations about inductive inferences. Trust as an expectation of the continued provision of utilities, on the institutional level, will be characterized as a first-order sort of trust. It can be disappointed without necessarily threatening the continuation of a given institution, especially if there is no alternative service provider. But trust as an expectation of the continued functioning of democratic mechanisms will be characterized as a second-order sort of trust. The paper will argue that the second-order kind of trust is essential for the functioning of democracies.
Corrosion and Wear Analysis in Marine Transport Constructions
Authors: Urbahs Aleksandrs , Savkovs Konstantīns , Rijkuris Gints , Andrejeva Darja
Published: March 2018

Corrosion is one of the most common naturally occurring processes studied by thermodynamics, which includes oxidation process, metal disruption, and its chemical and electrochemical effects under environmental influence. Corrosion of metal and equipment accounts for a considerable proportion of total corrosion losses, thus providing the impetus for further investigation and developments related to corrosion protection in order to provide transport systems and industry with corrosion preventive materials and tools.
Development of bioimpedance sensing device for wearable monitoring of the aortic blood pressure curve
Authors: Kõiv H. , Rist M. , Min M.
Published: March 2018

Wearable devices that monitor our vital signs have been gaining more importance with each year. Non-invasive, continuous, accurate and precise blood pressure assessment method integrated in a wearable is a multidisciplinary challenge. This work presents an electrical bioimpedance (EBI) unit for multi-frequency measurements on pulsating artery for central aortic pressure (CAP) estimation. The developed device provides low complexity in the electronics design with a frequency range between 1 kHz and 200 kHz. It is able to register the impedance of blood vessel volume change simultaneously at different locations. Experiments were carried out in vivo by using the four-electrode configuration on human thorax, axillary artery and radial artery. Preliminary results show the applicability of the proposed impedance spectroscopy system to measure blood vessel volume changes. The impedance data can be later interpreted into the aortic blood pressure wave by using a generalized transfer function. In addition, experimental test-phantom and electrode design are introduced for testing purposes of the impedance system.
Piezoelektrisches Energy-Harvesting in niederfrequenter Anregungsumgebung mittels kontaktbasierter Frequency-Upconversion
Authors: Dorsch Philipp , Geyer Sebastian , Gedeon Dominik , Hubert Florian , Rupitsch Stefan J.
Published: March 2018

Es wird die Entwicklung und Optimierung eines piezoelektrischen Energy-Harvesting-Systems zur Generierung von elektrischer Energie aus menschlichen Bewegungen vorgestellt. Um die Energie der beim Sport auftretenden tieffrequenten spektralen Beschleunigungsanteile aufnehmen zu können, darf das Harvesting-System eine Eigenresonanzfrequenz von

5

Hz

5\hspace{0.19em}\text{Hz}

nicht überschreiten und muss dabei zusätzlich eine kompakte Bauweise aufweisen. Zur Gewährleistung dieser beiden Punkte wird das Prinzip der kontaktbasierten Frequency-Upconversion verfolgt. Der Primäroszillator wird dabei mit seiner Eigenfrequenz an die energiereichsten Anteile des umgebenden Beschleunigungsspektrums angepasst und überträgt diese aufgenommene Energie, z. B. durch mechanischen Kontakt, an den Sekundäroszillator. Letzterer wandelt diese Energie in elektrische Energie. Dieser Beitrag erläutert analytische Auslegungs- und Optimierungskriterien von Primär- und Sekundäroszillator. Zudem wird eine geeignete Energieextraktionsschaltung ausgewählt, die das Energy-Harvesting-System komplettiert. Das Verhalten der einzelnen Teilsysteme und des Harvesting-Systems in seiner Gesamtheit wird daraufhin messtechnisch und simulativ untersucht. Als Ergebnis der Untersuchungen werden, anhand geeigneter Messungen, Energieübertragungsfaktoren ermittelt und die Funktionsfähigkeit des Gesamtsystems belegt.
On the Families of Stable Multivariate Transformations of Large Order and Their Cryptographical Applications
Authors: Ustimenko Vasyl
Published: March 2018

Families of stable cyclic groups of nonlinear polynomial transformations of affine spaces Kn over general commutative ring K of with n increasing order can be used in the key exchange protocols and El Gamal multivariate cryptosystems related to them. We suggest to use high degree of noncommutativity of affine Cremona group and modify multivariate El Gamal algorithm via conjugations of two polynomials of kind gk and g−1 given by key holder (Alice) or giving them as elements of different transformation groups. Recent results on the existence of families of stable transformations of prescribed degree and density and exponential order over finite fields can be used for the implementation of schemes as above with feasible computational complexity.
Power Series with Inverse Binomial Coefficients and Harmonic Numbers
Authors: Boyadzhiev Khristo N.
Published: March 2018

In this note we compute the generating function for the numbers terms of elementary functions and dilogarithms.
O Campo de Estrelas: um híbrido situado em algum lugar entre o Livro Ilustrado e a Novela Gráfica
Authors: Radünz Karen Pötter , Herzog Vivian
Published: March 2018

O presente artigo apresenta considerações acerca do chamado conto-ilustrado, um híbrido situado entre o livro ilustrado e a novela gráfica, que consiste em um conjunto de fragmentos ilustrados produzidos a partir de um conto escrito. Neste artigo, será apresentado o conto-ilustrado junto a uma reflexão sobre a sua produção prática, considerando, também, ao longo do processo, reflexões obtidas a partir de estudos referentes à área do livro ilustrado e da novela gráfica, contemplando, principalmente, aspectos relacionados ao design autoral.
Design de Embalagem e informação nutricional em alimentos para dietas com restrição à lactose
Authors: Terra Julia Castilho
Published: March 2018

Considerando que as embalagens de produtos sem lactose possuem carência de informação, ou a desorganização da mesma, o presente trabalho pretende utilizar os conhecimentos de Design Gráfico  a fim de contribuir com a população  que sofre com intolerância a lactose, a partir da criação de uma padronagem visual que permita fácil identificação do produto nas gôndolas, garantindo que o mesmo possa ser consumido pela pessoa com devida restrição alimentar. Dessa forma, minimizaria um problema presente no cotidiano dos intolerantes (que fazem uma busca exaustiva por essas informações, para poder consumir o alimento) e, ainda assim, refletiria positivamente no número de vendas das empresas que adotassem tal método de identificação.
A mulher, a cidade e o Muro
Authors: Antunes Caroline Muller
Published: March 2018

Este artigo traz como foco a discussão sobre a presença feminina no cenário do grafite e pichação, partindo da revisão de textos sobre escritas urbanas e estudo de caso das práticas de arte de rua produzidas por mulheres na cidade de Pelotas. A participação de mulheres no funcionamento das micropolíticas de ocupação do espaço urbano através do pixo e grafite são importantes ações de expressão, abrindo possibilidades que fomentam a discussão sobre gênero. O estudo de caso ocorre na cidade de Pelotas/RS, especificamente no bairro Porto, ambiente universitário onde se constata atualmente um número bastante elevado de pichações de cunho feminista. Tais pichações evidenciam uma nova relação da mulher com a rua, e consequentemente com a cidade e a sociedade. Traços, vestígios e gritos, antes reprimidos, ressignificam e tornam visível a existência das mulheres no cotidiano da cidade.
NOTAS SOBRE A NATUREZA-MORTA E NATUREZA COMO SUPORTE NA CONTEMPORANEIDADE
Authors: Corrêa Milena Duarte , Benetti Alfonso
Published: March 2018

O presente artigo foi desenvolvido a partir de uma pesquisa em andamento iniciada no ano de 2015. Esta, intitulada “Contestações e Subversões na Representação Artística dos Objetos”, tem por objetivo investigar as relações que podem ser estabelecidas com o gênero milenar da história da arte -natureza-morta- e, posteriormente, a Natureza como suporte para arte da contemporaneidade. O projeto vem se desenvolvendo enquanto pesquisa e está sendo aplicado nos estágios da licenciatura do curso de artes visuais em escolas da rede pública.
DIÁLOGOS ENTRE HISTÓRIA DA ARTE & NATUREZA
Authors: Ribeiro de Souza Amanda Delgado , Bonilha Caroline Leal
Published: March 2018

O trabalho tem por objetivo anunciar e refletir a respeito da relação do grupo de estudos “História e Teoria das Imagens: Diálogos entre Arte e Natureza”, constituído por alunos da licenciatura e bacharelado de Artes Visuais da Universidade Federal de Pelotas, com a História da Arte. Relata os desenvolvimentos do grupo, que com o objetivo de compreender as relações entre indivíduo, arte e natureza, e refletir questões ambientais, inicia estudos desde as alterações na pintura de gênero, para o surgimento da pintura de paisagem na arte holandesa, refletindo também a preocupação de artistas do século XIX, como Felix Taunay, até as reflexões a respeito da importância da temática da 32ª Bienal de São Paulo para os estudos do grupo. Com o intuito de aprofundar e esclarecer a compreensão do transito dinâmico do grupo na utilização da História da Arte é feita uma metáfora com a produção artística do pintor Paulo Pasta.
DOCUMENTAÇÃO DE CONSERVAÇÃO DE ACERVOS EM PAPEL: A COLEÇÃO DE GRAVURAS ORIENTAIS PERTENCENTES AO MUSEU DE ARTE LEOPOLDO GOTUZZO
Authors: De Pereira Pamela Pereira , Lacerda Claudia Fontoura
Published: March 2018

Esta pesquisa tem como objeto de estudo o conjunto de gravuras orientais que fazem parte do acervo doado ao Museu de Arte Leopoldo Gotuzzo - MALG/UFPel, entre 2012 e 2016, por Luis Carlos Lessa Vinholes. As gravuras, que ainda se encontram em processo de inventário na instituição, são constituídas em suporte de papel, o que as tornam sensíveis à umidade relativa, à luz e à temperatura inadequadas. Este trabalho tem como objetivo realizar a catalogação e a preservação desta coleção de gravuras, através de pesquisa no arquivo do MALG, revisão bibliográfica, entrevista com o doador do acervo e consultoria com especialista em gravuras, além de análise do estado de conservação e a produção de fichas de identificação e diagnóstico desta coleção.