Miracle-dz/UniFAR-FTUs huggingface dataset:
Modeling and Simulation of a Gas Turbine Engine for Power Generation

The gas turbine engine is a complex assembly of a variety of components that are designed on the basis of aerothermodynamic laws. The design and operation theories of these individual components are complicated. The complexity of aerothermodynamic analysis makes it impossible to mathematically solve the optimization equations involved in various gas turbine cycles. When gas turbine engines were designed during the last century, the need to evaluate the engines performance at both design point and off design conditions became apparent. Manufacturers and designers of gas turbine engines became aware that some tools were needed to predict the performance of gas turbine engines especially at off design conditions where its performance was significantly affected by the load and the operating conditions. Also it was expected that these tools would help in predicting the performance of individual components, such as compressors, turbines, combustion chambers, etc. At the early stage of gas turbine developments, experimental tests of prototypes of either the whole engine or its main components were the only method available to determine the performance of either the engine or of the components. However, this procedure was not only costly, but also time consuming. Therefore, mathematical modelling using computational techniques were considered to be the most economical solution. The first part of this paper presents a discussion about the gas turbine modeling approach. The second part includes the gas turbine component matching between the compressor and the turbine which can be met by superimposing the turbine performance characteristics on the compressor performance characteristics with suitable transformation of the coordinates. The last part includes the gas turbine computer simulation program and its philosophy. The computer program presented in the current work basically satisfies the matching conditions analytically between the various gas turbine components to produce the equilibrium running line. The computer program used to determine the following: the operating range (envelope) and running line of the matched components, the proximity of the operating points to the compressor surge line, and the proximity of the operating points at the allowable maximum turbine inlet temperature. Most importantly, it can be concluded from the output whether the gas turbine engine is operating in a region of adequate compressor and turbine efficiency. Matching technique proposed in the current work used to develop a computer simulation program, which can be served as a valuable tool for investigating the performance of the gas turbine at off-design conditions. Also, this investigation can help in designing an efficient control system for the gas turbine engine of a particular application including being a part of power generation plant.
Molecular detection of methicillin resistant staphylococcus aureus (MRSA) from a clinical case of myiasis wound: a case report

Resistance of antibiotic to organisms is the matter of global concern. Methicillin resistant Staphylococcus aureus (MRSA) infection is rapidly increasing in both human and animals. A 2.5-year-old indigenous calf brought with myiasis wound and bacteria associated with myiasis wound was studied and further molecular detection confirms the presence MRSA.
Facing the SNR wall detection in Full Duplex Cognitive Radio Networks using a GLRT multipath based detector

Recently, with the advances in self-interference cancellation, full-duplex (FD) techniques have become a feasible approach to improve the spectrum usage in new generation wireless systems. In particular, in cognitive radio networks, FD allows a secondary user to simultaneously sense the spectrum and transmit, improving the network efficiency. However, the residual self interference (RSI) arising from an imperfect cancellation, represents a bottleneck for the spectrum sensing performance. This paper analytically demonstrates that RSI represents a colored noise which leads to the SNR Wall phenomenon making the typical OFDM signal detectors no longer robust. To overcome this drawback, we propose a generalized likelihood ratio test detector exploiting the multipath correlation due to the primary user’s (PU) channel. It is proven that the proposed method is not affected by the SNR Wall, hence it is robust w.r. t an imperfect self-interference cancellation. Specifically, best detection performance is achieved when an approximated knowledge of the maximum delay spread of the PU channel is available, otherwise it is shown that a limited performance degradation occurs. Moreover, provided results highlight that our approach outperforms the classical alternatives in different scenarios, including when PU employs a mixed numerology OFDM signal, which characterizes the 5G New Radio waveform.
Effective electromagnetic parameters of novel distributed left-handed microstrip lines

The novel one-dimensional left-handed microstrip lines (LHMLs) consisting of the arrays of thin wires and two-layer split-ring resonators are investigated theoretically and experimentally in this paper. Unlike the conventional left-handed metamaterials for waveguides or microstrip lines, which are bulky three-dimensional constructions or require the lumped elements for high-pass configuration, this distributed structure can be directly implemented on a substrate by photolithographic techniques without soldering any chip inductors or capacitors. Moreover, it can also be easily realized at a higher frequency region by scaling the dimensions of the structure, making it highly efficient and flexible in millimeter-wave applications. To characterize the inhomogeneous LHML, the effective medium description is developed for extracting the effective electromagnetic parameters, i.e., the complex effective permittivity and permeability, as well as the refractive index. Results show that not only the simultaneously negative real permittivity and permeability, but also the antiparallel phase and group velocities may be achieved in the design passband region. In contrast to the antenna array using the conventional microstrip delay line, the LHML is incorporated in the series-fed microstrip combline array to exhibit the leading phase between the successive elements.
A Compact Narrow-Width End-Fire Leaky Wave Antenna on Coplanar Stripline

This communication presents a compact end-fire leaky wave antenna (LWA) is presented on the coplanar stripline (CPS) with narrow width property under a new operation mechanism. By periodically loading stubs between two strip lines in parallel, the leaky region of its fundamental mode can be generated in the CPS with forward beam scanning property, and the end-fire radiation is realized at the frequency where its normalized phase constant is equal to one. Since the leaky region of the fundamental mode owns a relatively low cutoff frequency, the proposed antenna generally has the property of small overall size in this region. The end-fire operating frequency is firstly discussed based on the circuit model, and the corresponding radiation property is then analyzed from the antenna array point of view. The leakage constant as well as characteristic impedance of the proposed antenna are further investigated with the full-wave extraction method. Moreover, a modified structure is proposed as the last element of the antenna to leak out the rest of the energy at its end. Finally, a CPS leaky-wave prototype antenna is designed and fabricated, where the measured results show good agreement with the simulated ones and thus validate the predicted performances.
Vibrations and noise produced by special purpose permanent-magnet synchronous motors in variable frequency operation

Synchronous motors with solid-state power supply are widely used for variable speed applications. To keep the machine size to a minimum and maximize efficiency, high speed synchronous motors are used wherever possible. Such motors are inevitably a source of considerable magnetic, windage and mechanical noise. Developments in the field of rare-earth permanent magnets have made it possible to design and build synchronous machines of large power ratings with high efficiency and high power-to-weight ratio. For speed control, generally solid-state inverters are used. This paper presents a brief description of the theoretical and experimental investigations conducted on a variety of permanent-magnet synchronous motors in connection with the problems of noise and vibrations. In order to illustrate the procedures to determine the mechanism of the production of the noise and vibrations and to reduce them, two specific motors are considered here. The first motor has a power rating of 1.1 MW with 16 pairs of poles. The second motor is of a power rating of 1.5 MW, and has a very special design suitable for high speed operation.
Multi-level job scheduling in a flexible job shop environment

This study deals with a scheduling problem with multi-level job structures in a flexible job shop environment. This scheduling process arises after the part production plans are created by the MRP (material requirement planning) system, therefore the total tardiness measure is considered as an objective function in order to complete the parts by the set due dates. MILP (mixed integer linear programming) model is introduced to mathematically represent the target problem. Owing to the high complexity of the target problem, GA (genetic algorithm) is proposed to solve the problem and additional methods, such as priority rules and local search rules, are applied to improve the performance of GA. Computational examples are shown and the results are discussed in comparison with the results of IBM ILOG CPLEX and IBM ILOG CP Optimizer.
A study of real-time and autonomous decentralized DSRC system for inter-vehicle communications

To realize the inter-vehicle communications (IVC) system, the development of a real-time and autonomous decentralized dedicated short range communication (RAD-DSRC) is necessary. In this paper, the performance of a physical layer of the RAD-DSRC system is evaluated considering the influence of the radio propagation characteristic for the IVC system. The performance of a media access control layer is also evaluated with the PL (packet loss) performance of a CSMA (carrier sense multiple access). It is clarified that the improvement of the PL for the CSMA is possible to utilize the spread spectrum technology.
Information and computer technologies in media specialist preparation

New information and computer technologies transform the social interaction and impose new demands for skills and thinking upon media specialists. The aim of this study is to determine the most effective set of information technologies, which can help media specialists develop competencies and thus stay competitive in the labor market. The research methodology is based on the overview of case studies concerning issues such as technology trends, human capital, and talent competitiveness. The qualitative analysis was performed in three phases – overviewing case studies, distinguishing trends and problem-solving. Analyzing data on skill supply and demand, the key skills needed to succeed in the workplace were identified. The results of the three-phase research revealed that the most important competencies needed to be in demand today are technology literacy, stress tolerance, and big data skills. The major finding of this study is that a media specialist needs to focus on learning throughout his life and gain hard and soft skills in the process.
Discussion and Analysis on the Fungus, Humidity and Salt Fog Environmental Test

The products which work in the field, aviation, marine and other harsh environmental conditions are easily to failure caused by humidity, slat fog and fungus, so the three anti-protection technology is particularly important. In this paper, we will analyze and talk about some key issues in the three anti-(humidity, slat fog and fungus) environmental test, such as the fungus testing cycle, the selection of fungus, the testing methods of the salt fog and humid , the evaluation of test results and so on. Give recommendations for improvement at last.
MULASSIS: a Geant4-based multilayered shielding simulation tool

Radiation shielding analysis is a crucial process in the spacecraft and space instrument development cycle. Simple tools such as SHIELDOSE-2 are used traditionally. With advances in computer and network technology and in energetic particle transport simulation codes, detailed Monte Carlo (M-C) simulation is no longer an approach reserved for research scientists but is widely becoming an important engineering tool. In this paper, we report on the main features of the multilayered shielding simulation software tool (MULASSIS) developed as part of the European Space Agency (ESA) activities in the Geant4 collaboration. It is based on the Geant4 M-C simulation toolkit developed by a large international collaboration lead by CERN. The software will be used as a general tool within ESA for radiation fluence, dose, and effects analysis. It has been integrated into the ESA SPENVIS system, thus, making it accessible to the wider space community over the World Wide Web.
Compact dual ports handheld RFID reader antenna with high isolation

A compact dual ports antenna with high isolation is proposed for handheld radio frequency identification (RFID) reader, which is rarely reported in open literatures. Different with conventional handheld RFID reader antenna with single port, the proposed antenna transmits and receives signal separately. The proposed antenna operating with full duplex mode can enhance effectively sensitivity of reader, as the strong transmitting signal of reader with single port is usually highly coupled with weak receiving backscatter signal of tag. The antenna utilizes aperture coupled patch structure that occupies less volume and provides further space‐saving efficiency. The height of the proposed antenna is only 5.1 mm and the volume of that is 80 ×80 × 5.1 mm3, which is easy to integrate in handheld RFID readers. The antenna uses four symmetric coupling apertures to excite two orthogonal modes for dual polarized operation. High isolation of around −35 dB is obtained by proper arrangement of the length and position of the coupling apertures. The maximum measured return loss is −39 dB at 2.4 GHz and isolation is −47 dB at 2.4 GHz. The antenna is suitable for applications in handheld RFID readers. © 2015 Wiley Periodicals, Inc. Int J RF and Microwave CAE 25:548–555, 2015.
A Multidisciplinary Engineering Laboratory Course

The Colorado School of Mines (CSM) curriculum was recently modified by replacing laboratory courses in electrical circuits, fluid mechanics and stress analysis with a sequence of Multidisciplinary Engineering Laboratory courses (MEL I, II, and III). The MEL sequence prepares students for their professional careers by integrating discipline‐specific components into systems and building subject‐matter depth through a vertical sequence. The experiments move beyond basic theory verification by requiring students to practice higher level thinking. In addition, the systems experiments encourage students to reorganize knowledge and discover the connections among concepts in several courses. The MEL sequence helps students understand relationships among science, engineering science, and engineering design. The MEL experiments develop life‐long learning skills by encouraging higher levels of thinking on the Perry scale and requiring students to use a variety of Kolb's learning styles. This paper describes the educational objectives and experiments for the MEL I course. The paper gives assessment results for MEL I and compares it with traditional laboratories.
Permittivity measurements using open-ended sensors and reference liquid calibration-an uncertainty analysis

Results of the uncertainty analysis of the error-corrected permittivity measurements of materials using open-ended sensors are reported. Uncertainties in the permittivities of the reference liquids due to the uncertainties in the Cole-Cole parameters are discussed. The effect of the selection of these parameters of reference liquids, when used as calibration standards for error-corrected permittivity measurements, is highlighted. The results of measurements performed on 15 and 30 ppt saline test liquids are presented along with the measurement uncertainties resulting from uncertainties in the Cole-Cole parameters of the reference liquids. >
Investigations and prospects of Fabry-Perot antennas: A review

Fabry-Perot (FP) antennas have characteristics of planar structures combined with high gain, and they have been widely used in wireless communications. With the progress of ongoing research, FP antennas have achieved various capabilities, but many of them are still under development, such as lowprofile, wideband, circular polarization, multi-band, low-radar cross section (RCS) and reconfigurable features. This paper discusses the theoretical analysis methods and research progress of FP antennas, and explains the realization methods of different features of FP antennas. In order to indicate different technologies for realizing various capabilities, the key technologies and features of some of the latest designs are described. Finally, the research situation and prospects of FP antennas are summarized to guide their research directions in the future.
Operationalizing “resilience” for disaster risk reduction in mountainous Nepal

Purpose – The purpose of this paper is to describe empirical research intended to fill the perceived gap in practical guidance methodologies for assessing resilience. Design/methodology/approach – To do so, an interdisciplinary team of researchers studied landslide risk in four different communities of Central and Eastern Nepal using a case study approach. Two case studies on flood-affected communities were developed for comparison sake in more urban areas. Methods combined qualitative participatory approaches to develop indicators of resilience as well as a household survey and focus group discussions for collecting data on the indicators. Findings – What the research results demonstrate is a relatively straightforward and simple means for obtaining data on the state of a community's resilience as a relatively simple “snapshot” of resilience at one period in time, assuming that resilience is an outcome that can be improved over time with the “right” set of interventions. Research limitations/implications.
The double-directional radio channel

We introduce the concept of the double-directional mobile radio channel. It is called this because it includes angular information at both link ends, e.g., at the base station and at the mobile station. We show that this angular information can be obtained with synchronized antenna arrays at both link ends. In wideband high-resolution measurements, we use a switched linear array at the receiver and a virtual-cross array at the transmitter. We evaluate the raw measurement data with a technique that alternately used estimation and beamforming, and that relied on ESPRIT (estimation of signal parameters via rotational invariance techniques) to obtain superresolution in both angular domains and in the delay domain. In sample microcellular scenarios (open and closed courtyard, line-of-sight and obstructed line-of-sight), up to 50 individual propagation paths are determined. The major multipath components are matched precisely to the physical environment by geometrical considerations. Up to three reflection/scattering points per propagation path are identified and localized, lending insight into the multipath spreading properties in a microcell. The extracted multipath parameters allow unambiguous scatterer identification and channel characterization, independently of a specific antenna, its configuration (single/array), and its pattern. The measurement results demonstrate a considerable amount of power being carried via multiply reflected components, thus suggesting revisiting the popular single-bounce propagation models. It turns out that the wideband double-directional evaluation is a most complete method for separating multipath components. Due to its excellent spatial resolution, the double-directional concept provides accurate estimates of the channel's multipath-richness, which is the important parameter for the capacity of multiple-input multiple-output (MIMO) channels.
Registered laser speckle imaging analysis of cerebral tumor

Laser speckle imaging (LSI) has been widely used for in vivo detecting cerebral blood flow (CBF) under various physiological and pathological conditions. So far, nearly all literature on in vivo LSI does not consider the influence of disturbances due to respiration and/or heart beating of animals. In this paper, a registered laser speckle contrast analysis (rLASCA) method has been proposed which first registers raw speckle images with a 3×3 convolution kernel, normalized correlation metric and cubic B-spline interpolator, and then constructs the contrast image for CBF. rLASCA not only significantly improves the distinguish ability of small vessels, but also efficiently suppresses the noises induced by respiration and/or heart beating. In an application of imaging the angiogenesis of rat's brain tumor, rLASCA providing a much higher resolution for new small vessels. IndexTerms—Cubic B-spline interpolation, laser speckle imaging (LSI), normalized correlation registration, registered laser speckle contrast analysis (rLASCA
Loop-type ground antenna using capacitor

A loop-type ground antenna formed by connecting a capacitor between two ground points is described. The resonant frequency of the ground loop is conveniently controlled by changing the capacitance. The proposed loop-type radiator is excited by conventional shorting line loop feeding that may include an inductor. A loop type ground antenna is designed for Bluetooth and Wi-Fi applications.
Can C-K theory apply to Knowledge-Based Engineering systems?

The aim of this study is to provide a framework for the development of an interactive system for assistance to collaborative design. This framework provides to designers a tool to formalise design knowledge in order to share and reuse the active resources of the design. The study of domain knowledge models was based on a new theory of design known as C-K theory (Hatchuel and Weil, 2002). This theory is based on the distinction between the concept space and the knowledge space in integrated design. It stipulates that design oscillates from one space to another by co-building the product and knowledge which supports it. In this paper, we implement DeSIgn with KnOwledge VERsioning (DISKOVER) knowledge models as an application of the C-K theory operators. Those models are based on three knowledge levels, which are split into a product models (concepts) and design process models, otherwise knowledge that describe the product. The impact of versioning on the instantiation of DISKOVER knowledge models to C-K design theory was also studied in this research.
On the design of a misinformation widget (Ms.W) against cloaked science [UNDER REVIEW]

—Amongst all types of fabricated information travelling on open social networks (OSN), scientiﬁc misinformation, or cloaked science , is particularly dangerous. Here we present the design of the TRESCA misinformation widget (Ms.W), which is both a methodology and a toolbox for investigating disinformation operations leveraging scientiﬁc communications. Ms.W follows a man-in-the-loop approach: the methodology takes into consideration ideological and psychological biases, while the toolbox integrates open source intelligence solutions for verifying the accuracy of claims and the credibility of sources. Overall, Ms.W. is a ﬂexible investigative tool offering a REST API for advanced users, who can create and label datasets and add new functionalities to the toolbox.