Miracle-dz/UniFAR-FTUs huggingface dataset:
Probabilistic neural method combined with radial-bias functions applied to reservoir characterization in the Algerian Triassic province

In this paper, we combine a probabilistic neural method with radial-bias functions in order to construct the lithofacies of the wells DF01, DF02 and DF03 situated in the Triassic province of Algeria (Sahara). The determination of lithofacies is a crucial problem in reservoir characterization. Our objective is to facilitate the experts' work in the geological domain and allow them to obtain quickly the structure and nature of the land around the drilling. This study intends to design a tool that helps automatic deduction from numerical data. We use a probabilistic formalism to enhance the classification process initiated by a self-organized map procedure. Our system gives the lithofacies, from well-log data, of the reservoir wells concerned in a way that is easy to read by a geology expert who identifies the potential for oil production at a given source and so forms the basis for estimating the financial returns and economic benefits.
The Empirical Study on Relationship between Design-Manufacturing Integration and Manufacturing Performance of Chinese Manufacturing Enterprises

Nowadays, researchers’ study on DMI more focus on the influence of DMI to new products or new products development, Few focus on the influence to the manufacturing performance in manufacturing enterprises. Especially it lacks empirical research on how DMI’s various activities influence manufacturing performance and how interact on each other between them. Based on the theoretical analysis on DMI, this paper analyzes the correlations between horizontal organizational integration, design integration, technological integration and the relation between them and manufacturing performance, provides the hypothesis, and carries out the empirical research on 150 enterprises in china in 2009’s International Manufacturing Strategy Survey, it turned out that horizontal organizational integration, design integration between design and manufacturing departments have positive promoting effect on technological integration. Horizontal organizational integration, design integration and technological integration have positive promoting effect on manufacturing performance. Technological integration plays mediating effect between horizontal organizational integration and manufacturing performance. Technological integration plays mediating effect between design integration and manufacturing performance.
Learning Construction of Students of Prospective Teacher Based on Digital Literacy in the Era of Pandemic Covid-19

This article aims at building literacy-based learning for students of prospective teacher. Empirical problems sound that the effect of Covid-19 pandemic has affected education in various countries, including Indonesia. As a result, learning interactions are reduced due to a limited movement and access to learning, parental support, and significant changes in the new normal era, while conditions require life skills. This requires students of prospective teacher to have digital literacy skill as the competence of 21st century. It is very important to pay attention to them through integrative and adaptive learning constructs. There are various suggestions for studying in the era of pandemics. Qualitative methods focus on learning case strategies, students of prospective teacher, and lecturer to participate in this study. The data were collected and analyzed. Students of prospective teacher are digital media users in learning activities, while digital literacy skills demonstrate personal and social competencies and interventions from internal and external circumstances. Learning construction should pay attention to adaptive, participatory, integrative action, guidance, example, friendliness, and control of humanist movements. It is expected to improve professionalism and encourage the success of future prospective teachers in their profession.
Assessment of Driver Movements during Prolonged Driving Using Seat Pressure Measurements

Driver’s physiological state changes with the increase of driving time. The current study used seat pressure to examine the driver movements (result from driver’s physiological state changes) during prolonged driving. Two experiments were conducted in real vehicle and driving simulator, respectively. Ten male participants were divided into two groups to complete the two experiments, respectively. According to the results of the real vehicle experiment, moment center in the seat back and average pressures were found to have significant correlation with time. The results indicated that there were two kinds of movements: (1) participants turned their heads front, their backs became more curving, and their knees rose; (2) participants turned their heads rear, their back angles became larger, and their knees rose. The results of driving simulator experiment proved that the seat pressure was sensitive to movements, and proved that effects of driving movements (result from driving task) on the seat pressure were significant, which indicated the control of redundant movements, including driving movements, was very important in the study.
Model Based Optimization of Forging Process Chains under the Consideration of Penalty Functions

For the production of forged components, it is necessary to coordinate and optimize the production stages along the different process chains. This includes the mainstream processes as well as the associated process chains and the respective processes of die manufacturing. Until now, these processes and process chains are commonly planned and optimized independently due to different and often contradictory target criteria. This paper deals with an extended approach to a holistic planning and optimization of forging process chains by means of the optimization technique Genetic Algorithm (GA) in order to reduce production costs and time.
Modeling the structure of local energy markets

One of the key conditions for correctly programming the Polish energy market development lies not only in the efficiency of current management, but also in the process of making rational decisions with respect to programming the development of the regional energy supply systems and the sources of such development financing. Making wise decisions will determine the future potential growth of the energy sector, its share in the market, and the potential to generate profit for the national economy. Proper modeling of the structure of national and local energy markets is a key to national economic development during this market transformation.
Carrier and photon dynamics in transversally asymmetric high-speed AlGaAs/InP MQW lasers

Carrier transport and carrier capture were reported to markedly influence the carrier and photon dynamics in quantum-well semiconductor lasers and to limit the modulation bandwidth. Recently, model calculations of various degrees of complexity have isolated special aspects of the problem. We given an extended overview and report on our theoretical and experimental results on 1.55 micrometer AlGaInAs/InP lasers with strongly asymmetric transversal waveguide structures. The self-consistent solution of the Poisson and continuity equations is based on measured carrier mobilities and not only limited to the confinement region. The confinement factor is pointed out to be important when comparing different asymmetric structures. The use of optimized asymmetric structures is demonstrated theoretically and experimentally to enable a distinct improvement in modulation bandwidth and to counteract the limiting physical processes such as carrier transport and carrier capture-escape. Finally, the influence of the shape of the longitudinal carrier and photon density profiles on the modulation behavior is studied. We found that a better homogenization of these profiles for transversally optimized structures may slightly increase the bandwidth. This is further confirmed experimentally by comparing lasers of different profiles applying chirped DFB gratings implemented by bent waveguides.
Design System and Simulation Control of the 6-DOF Parallel Manipulator

In this paper presents the design system and simulation control of the 6-DOF parallel manipulator. The moveable platform supported by the six electrical cylinder. The mechanic component and kinematics model are explained, dynamics model using Lagrangian equation and computer model of Joint space control scheme using Simulink and the 6-DOF parallel manipulator systems are show in this paper.
Hierarchical Clustering Assisted Human Health Risk Assessment of PAHs in a Typical Oilfield, China

To assess how the human exposure to environmental carcinogenic polycyclic aromatic hydrocarbons (PAHs) contaminant generated from a typical oilfield, we used a recommended exposure risk model, appraised with actual measured PAH concentration in an oilfield soils. Hierarchical clustering method was also applied to classfied the total exposure risk (carcinogenic and non-carcinogenic) of 16 PAHs, and four risk grades were obtained as zero risk, low risk, medium risk, and high risk. It was found that ingestion was the major exposure route among the three exposure routes. Risks of dibenz(a,h)anthracene and benzo(a)pyrene were higher than the other contaminants, and represent high risk grade.
Stiffness of Flexible Caisson Foundations Embedded in Nonhomogeneous Elastic Soil

Solutions are presented for stiffness coefficients to represent the elastic behavior of a caisson foundation embedded in soil. The solutions use a novel numerical technique, the scaled boundary finite element method, combined with shell elements to represent the foundation itself. The stiffness coefficients take into account the possibility of nonhomogeneity in the soil (stiffness varying with depth), the geometry of the foundation, and the contribution to the stiffness of the skirt of the caisson foundation. Tabulated values allow a simple curve fit to the stiffness values to be employed for particular cases. The accuracy of the method is tested against previous solutions for particular cases. Example calculations are given to illustrate the method.
Le marché obligataire corporate : un levier pour les PME-ETI ?

The 2008 financial crisis and hardened regulatory requirements have resulted in a more restrictive credit offering to small and middle-size enterprises (SMEs). To finance their growth, SMEs must thus find alternative financing sources. Bonds issuance may appear as a promising solution. However, this market is only accessible to large companies, be it on the national or on the international market. The objective of this article is to stress the conditions that will enable SMEs to get access to direct fixed income market financing. The results evidence a strong development of this market since 2010. However, two conditions are required for this market to attain the scale it deserves: the low financings needed by SMEs must be mutualized and their risk adequately assessed. Classification JEL: G10, G23, G32, L25.
A comparative study of permanent magnet and switched reluctance motors for high-performance fault-tolerant applications

Switched reluctance machines (SRMs) have been extensively researched for high performance aerospace applications because of their inherent fault tolerance. Recent work by the authors suggests that with careful design a similar degree of fault tolerance may be achieved with a permanent magnet machine (PM) at a significantly higher torque density than its SRM counterpart. This latter suggestion is of crucial importance in high performance applications, such as aerospace, where a low mass is essential. This paper is concerned with reporting measured results from a fault tolerant PM machine, and using these results to examine the relative merits of SR and PM technology for this application.
Performance of Cross-Layer Design with Antenna Selection and Imperfect Feedback Information in MIMO Systems

By combining adaptive modulation and automatic repeat request, a cross-layer design (CLD) scheme for MIMO system with antenna selection (AS) and imperfect feedback is presented, and the corresponding performance is studied. Subject to a target packet loss rate and fixed power constraint, the variable switching thresholds of fading gain are derived. According to these results, and using mathematical manipulation, the average spectrum efficiency (SE) and packet error rate (PER) of the system are further derived. As a result, closed-form expressions of the average SE and PER are obtained, respectively. These expressions include the expressions under perfect channel state information as special cases and provide good performance evaluation for the system. Numerical results show that the proposed CLD scheme with antenna selection has higher SE than the existing CLD scheme with space-time block coding, and the CLD scheme with variable switching thresholds outperforms that with conventional-fixed switching thresholds.
A Compact Active Ka-Band Filtenna for CubeSats

This letter describes the design of a right-hand circularly polarized planar filtenna (filter + antenna) that can reconfigure its operation between two center frequencies in the Ka-band. The filtenna structure is composed of a four-element array radiator and a reconfigurable bandpass filter, occupying an area of 31 × 14 mm. The circularly polarized array elements are fed by a sequential power divider for an enhanced polarization purity. The filter is based on a ring resonator loaded with a variable open stub. The length of the stub extends through a p-i-n diode switch, resulting in a change of the loaded reactance into the ring, and consequently tuning the filter's operating center frequency from 30.3 to 29 GHz. The proposed low-loss filtenna structure exhibits a reconfigurable fractional bandwidth up to 7.74%, a peak realized gain that can reach up to 11.5 dBic, an axial ratio of less than 1 dB, and a sidelobe level that can go as low as −12 dB. The prototype filtenna is fabricated and tested, where the measured results verify the simulated data. A figure of merit is proposed to highlight the superior performance of the presented Ka-band structure in terms of the polarization, size, reconfiguration ability, and radiation characteristics as proven by the comparison with other works in the literature.
Why did the environmental problem occur?-a discussion that focuses on defect

In this paper the rationale behind occurrence of environmental problems is discussed, and an approach to these problems is suggested by focusing on the nature of the thought process which governs human interaction with artifacts. First, instability and uncertainty in the thought process is focused on as a cause of creativity and error in human behavior, and the nature of the instability and uncertainty is discussed from the viewpoint of abduction and self-reference. Next, a design methodology of an artifactual environment is proposed based on this discussion.
Role of Damage Functions in Evaluation of Response Modification Factors

From the study of the nonlinear behavior of single degree of freedom (SDOF) oscillators, response modification factor spectra corresponding to failure conditions of structures are assessed by means of damage indices. Two different damage indices are used: one that neglects and one that takes into account the way in which the hysteretic energy is dissipated. Ground motion records obtained from several earthquakes and grouped as a function of magnitude of the event, source-to-site conditions and site-soil conditions are used as input for nonlinear dynamic analysis of inelastic SDOF systems in order to evaluate constant damage spectra of the strength reduction factors. Simplified relations depending on a limited number of significant parameters are then proposed to approximate the computed mean reduction factors, in order to derive inelastic response spectra directly from the elastic ones.
A Compliance-Based Compensation Approach for Designing High-Precision Flexure Mechanism

This paper presents an approach of utilizing parasitic motion compensation for designing high-precision flexure mechanism. This approach is expected to improve the accuracy of flexure mechanism without changing its degree of freedom (DOF) characteristic. Different from the method which mainly concentrates on how to compensate the parasitic translation error of a parallelogram-type flexure mechanism existing in most of the literatures, the proposed approach can compensate the parasitic motion produced by rotation in company with translation. Besides, the parasitic motion of a flexure mechanism is formulated and evaluated by utilizing its compliance. To specify it, the compliance of a general flexure mechanism is calculated firstly. Then the parasitic motions introduced by both rotation and translation are analyzed by utilizing the resultant compliance. Subsequently, a compliance-based compensation approach is addressed as the most important part of this paper. The design principles and procedure are further proposed in detail to help with improving the accuracy of the flexure mechanism. Finally, a case study of a 2R1T flexure mechanism is provided to illustrate this approach, and FEA simulation is implemented to demonstrate its validity. The result shows that it is a robust design method for the design of high-precision flexure mechanism.Copyright © 2012 by ASME
Improved ferroelectric and leakage current properties of Er-doped BiFeO3 thin films derived from structural transformation

Multiferroic pure and Er-doped BiFeO3 thin films were prepared using a sol–gel technique. The effect of Er-doped concentration on the crystal structure and on the ferroelectric and leakage current properties of BiFeO3 films were studied in detail. The study showed the enhanced ferroelectric polarization and reduced leakage current density that occurred after doping Er. Such improved ferroelectric and leakage properties are attributed to ferroelectric distortion and to the change of leakage current conduction mechanisms derived from the structural transformation that occurred after doping Er. The rhombohedral structure of pure BiFeO3 transforms to the coexistence of tetragonal and orthorhombic symmetry structure as Er-doped concentration x increased gradually to 0.15, then to the orthorhombic structure when x = 0.20. The present work provides an easy method to decrease the leakage current and improve the ferroelectric properties of BiFeO3 films.
Validation of a Driving Simulator for Work Zone Design

The research project aimed at calibrating and validating the driving simulator of the European Interuniversity Research Center for Road Safety to enable its use for design and verification of the effectiveness of temporary traffic signs on highways. The research was developed through the following steps: (a) a survey of speed measurements on highways next to a work zone of medium duration, (b) reconstruction in virtual reality of the real situation by using the driving simulator and subsequent running of a series of driving tests, and (c) statistical analysis of the field speeds and of the speeds from driving simulations for validation of the simulator. The surveyed work zone was located on Highway A1 from Milan to Naples, Italy. Speed measurements were conducted with a laser speed meter in the transition area, the activity area, and the termination area, and in the advance warning area speeds were shot with a camera from an overpass. Speed data from the field and the simulator were analyzed by using the bilateral Z-test for non-matched samples to determine whether drivers responded differently in the simulator compared with their response during the real driving experience. The activity carried out revealed that differences between the speeds observed in the real situation and those measured with the simulator were not statistically significant.
Characterization of aging transformer oil–pressboard insulation using some modern diagnostic techniques

This paper presents a study on the characterization of aging of transformer oil–pressboard insulation. Traditional and modern diagnostic tools and techniques were used to investigate aging of oil–paper insulation under controlled laboratory conditions. Insulation condition testing includes common chemical diagnostics such as acidity tests and new chemical techniques: determination of relative content of dissolved decay products by spectrophotometry, solid suspension by turbidimetry, Fourier Transform Infrared (FTIR) spectroscopy and electrical diagnostic techniques that have gained exceptional importance for utility professionals: polarisation/depolarisation current, recovery voltage measurement and frequency domain dielectric spectroscopy measurements. From the obtained results it is found that chemical tests depicted more sensitivity to insulation degradation. Also, different oil–pressboard insulation ratios were investigated to assess the influence of the relative amount of cellulosic materials on aged mineral oil decay products and vice versa. Emphasize is laid on the potentialities/avenues offered by FTIR to assess oil insulation condition. Notable experimental results have been reported, which could be valuable to researchers and practicing engineers in this field. Copyright © 2010 John Wiley & Sons, Ltd.
Frequency conversion by nearly-degenerate four-wave mixing in travelling-wave semiconductor laser amplifiers

The paper describes a scheme for frequency conversion of optical data signals with use of NDFWM in travelling wave semiconductor laser amplifiers. The frequency conversion range is limited by the gain bandwidth of the optical amplifier, which is about 4000 GHz in the considered case. The experimental arrangement of the conversion scheme is described and a theoretical analysis is presented. Finally the advantages and disadvantages of this scheme are discussed.
Defining a Balanced Maritime Safety and Security System

Many systems are developed from a technical perspective. Our system engineers, and system architects have great ideas and normally we try to convince potential costumers to buy our wonderful new product. What we mostly forget is to think from the customers perspective and consider how this new product can be used in their organization. This seems like an open door, but requires a different attitude in thinking. This paper is about how we dealt with the problem of defining a Maritime Safety and Security system (MSS system) that could be sold throughout the world.
Janus Interphase Organic‐Inorganic Hybrid Materials: Novel Water‐Friendly Heterogeneous Catalysts

In this work, amphiphilic silica‐based Janus‐type acid and base catalysts are introduced as heterogeneous analogues of surfactants. The new interphase organic‐inorganic hybrid catalysts comprise of two different groups (−C8H17, −C2H4Ph) on the hydrophobic and two different groups (−C3H6SO3H, −C3H6NH2) on the hydrophilic side. The hydrophobic sides of the catalysts are responsible for the diffusion of the organic substrates to the catalytically active sites while the hydrophilic sides carry catalytic centers being oriented towards the aqueous phase and thus providing sufficient connection between water (solvent) and the organic substrates. Catalyst preparation is based on simple synthetic procedures and leads in a first step to hollow silica spheres with hydrophobic groups on the inner and hydrophilic groups on the outer surface. After crushing the hollow spheres, acid resp. base functionalized Janus nano‐sheets are obtained. The basic catalyst was tested for the Knoevenagel condensation of a series of benzaldehydes with malononitrile in water, while the acid catalyst was used for Fischer esterification of acetic acid with ethanol.
Design and Study on the Intelligent Fault Diagnosis System of Diesel Engine

Based on modern measure technology, wavelet transform and neural networks, the system of diesel fuel fault diagnosis is designed. Wavelet packet power and RBF networks are combined together to diagnose the fuel oil system. The master system is developed with Visual C++ and the slave system is designed based on 89C52. The two systems communicate via the RS-232 serial communication. The system is applied in practice and performs well.