Miracle-dz/UniFAR-FTUs huggingface dataset:
Research on Multifunctional Gas Chromatography Sample Pretreatment Apparatus

Multifunctional gas chromatography sample pretreatment apparatus (hereinafter referred to as pretreatment apparatus), which is developed on the basis of gas purge micro-syringe extraction (GP-MSE) technique, is a gas chromatography (GC) sample pretreatment apparatus that integrates extraction, purification, concentration and predissociation. The quantitative and qualitative analysis results analyzed by GC-MS for volatile oil that extracted from the plant samples by steam distillation method and pretreatment apparatus, show that the volatile components extracted by the apparatus outnumber the ones extracted by steam distillation method clearly, and the content of major constituents extracted by the apparatus is higher. The apparatus have advantages of low consumption of agentia, short extraction time, high enrichment efficiency, simple structure, convenience in usage and low operating costs. The apparatus can be widely used in the areas of medicine, agriculture, food, quality control to the sample pretreatment of solid or liquid sample.
Integration of a Photovoltaic Panel with an Electric City Car

Abstract—Autonomy of light electric vehicles with limited mobility can be improved by assisting onboard energy sources, such as battery and ultra-capacitors, by solar energy. This article discusses the integration of a photovoltaic panel with an electric city car. The Photovoltaic Geographical Information Systems of Joint Research Center, Europe, is used for estimating the solar irradiance. Based on the estimations, a DC-to-DC boost converter topology is considered to interface the panel with the DC bus of the electric car. Experimental evaluation of the performance is carried out under a real climatic situation. An analytical loss model is used to comment on the associated losses and to explain the measured changes in gain and efficiency under varying irradiance. Acceptable extension in the autonomy of the electric city car is predicted from the results.
HVDC-transformers-a technical challenge

Design and manufacturing of HVDC-transformers and smoothing reactors for high DC-voltages are still very special devices and the number of manufacturers is limited. The paper analyses the components of HVDC-transformers and reactors in more detail and shows the influence of DC-operating conditions. The core looks very similar to conventional AC-transformers since it has to fulfil the same physical tasks. The designer has to recognise additional features like DC-currents which can oversaturate the core and probably overheat it and change completely the noise level and noise spectrum. The windings of HVDC-transformers look also very similar to AC-transformers. Additional losses by current harmonics are not so special for transformer designers. A speciality are valve windings. Very high test-voltages in combination with low number of turns can be a challenge for the designer. The insulation structure between windings and to ground as well as valve side leads and bushings are different from AC-transformers. Field plots for AC-, DC- and polarity reversal describe the technical problem in more detail. The process of quality control with the elements of material selection and control, component specification and testing of components needs more attention. Especially the process of adjustment of design of valve leads and valve bushings under the influence of various stresses and on site conditions is discussed in detail. The testing of HVDC-transformers is based on standards and customer specifications. The manufacturing process of HVDC-transformers differs partly from conventional transformers. Some examples are described in the paper.
Horizontal Steam Generator Thermal-Hydraulics at Various Steady-State Power Levels

Three-dimensional computer simulation and analyses of the horizontal steam generator thermal-hydraulics of the WWER 1000 nuclear power plant have been performed for 50% and 75% partial loads, 100% nominal load and 110% over-load. Presented results show water and steam mass flow rate vectors, steam void fraction spatial distribution, recirculation zones, swell level position, water mass inventory on the shell side, and other important thermal-hydraulic parameters. The simulations have been performed with the computer code 3D ANA, based on the 'two-fluid' model approach. Steam-water interface transport processes, as well as tube bundle flow resistance, energy transfer, and steam generation within tube bundles are modelled with {sup c}losure laws{sup . } Applied approach implies non-equilibrium thermal and flow conditions. The model is solved by the control volume procedure, which has been extended in order to take into account the 3D flow of liquid and gas phase. The methodology is validated by comparing numerical and experimental results of real steam generator operational conditions at various power levels of the WWER Novovoronezh, Unit 5. One-dimensional model of the horizontal steam generator has been built with the RELAP 5 standard code on the basis of the multidimensional two-phase flow structure obtained with the 3D ANA code.more » RELAP 5 and 3D ANA code results are compared, showing acceptable agreement. (authors)« less
AN IMPROVED NONLINEAR CURRENT MODEL FOR GAN HEMT HIGH POWER AMPLIFIER WITH LARGE GATE PERIPHERY

According to the characteristics of high power GaN amplifier, the common current-voltage (I-V) temperature dependence model established by Angelov is improved in this research. Besides embodying the surface temperature distribution, the most important improvement is that it can describe the current decreasing trend under high bias voltage due to trapping related dispersion and self-heating effect. The practical application shows that the prediction accuracy of the large signal equivalent circuit model is improved obviously after introducing the proposed I-V model.
A Real-Time Pothole Detection Approach for Intelligent Transportation System

In recent years, fast economic growth and rapid technology advance have led to significant impact on the quality of traditional transport system. Intelligent transportation system (ITS), which aims to improve the transport system, has become more and more popular. Furthermore, improving the safety of traffic is an important issue of ITS, and the pothole on the road causes serious harm to drivers’ safety. Therefore, drivers’ safety may be improved with the establishment of real-time pothole detection system for sharing the pothole information. Moreover, using the mobile device to detect potholes has been more popular in recent years. This approach can detect potholes with lower cost in a comprehensive environment. This study proposes a pothole detection method based on the mobile sensing. The accelerometer data is normalized by Euler angle computation and is adopted in the pothole detection algorithm to obtain the pothole information. Moreover, the spatial interpolation method is used to reduce the location errors from global positioning system (GPS) data. In experiments, the results show that the proposed approach can precisely detect potholes without false-positives, and the higher accuracy is performed by the proposed approach. Therefore, the proposed real-time pothole detection approach can be used to improve the safety of traffic for ITS.
Super-active shape-memory alloy composites

A new type of very-low-stiffness super-active composite material is presented. This laminate uses shape-memory alloy (SMA) filaments which are embedded within a low-hardness silicone matrix. The purpose is to develop an active composite in which the local strains within the SMA actuator material will be approximately 1%, while the laminate strains will be at least an order of magnitude larger. This type of laminate will be useful for biomimetic, biomedical, surgical and prosthetic applications in which the very high stiffness and actuation strength of conventional SMA filaments are too great for biological tissues. A modified form of moment and force-balance analysis is used to model the performance of the super-active shape-memory alloy composite (SASMAC). The analytical models are used to predict the performance of a SASMAC pull - pull actuator which uses 10 mil diameter Tinel alloy K actuators embedded in a 0.10 thick, 25 Durometer silicone matrix. The results of testing demonstrate that the laminate is capable of straining up to 10% with theory and experiment in good agreement. Fatigue testing was conducted on the actuator for 1 000 cycles. Because the local strains within the SMA were kept to less than 1%, the element showed no degradation in performance.
Design of Multiuser Temperature Real-Time Monitoring System with Function of Remote Communication

Temperature is an important physical characteristic parameter that features the patients physical condition in hospital, and it is a kind of clinical vital signs.This paper presents a kind of multiuser temperature real-time monitoring system; it can realize multiuser fast measure of patients temperature, and draw the patients temperature curves under the guidance of the monitoring system. The system would alarm timely when the patient's temperature is abnormal.
The Design and Implementation of a Gesture-Driven System for Intelligent Wheelchairs Based on the Orientation Histogram Method

An approach of hand gesture recognition, setting the orientation histogram of the picture as the characteristic vector of hand gesture, is discussed in this paper. It can decrease the influence of light changes during the process of recognition effectively. A gesture-Driven system for intelligent wheelchairs is also introduced in the paper. Experimental results show that the method is robust and accurate.
Noninvasive detection of artificial heart valve outlet strut fracture using sweep frequency eddy current testing

Thepaper proposes utilizationof eddy current inspection fordetection ofdefects intheartificialheart valve. Artificial heart valves are prosthetic replacements which are used if the function of the natural heart valve is limited. A special type of prosthetic heart valve replacements is the Bj¨ ork Shiley convexo-concave (BSCC) heart valve. The fractures of the BSCC artificial heart valve usually affect the outlet strut. If the fracture of the strut is not detected in time the patient can die of heart attack. Detection of the fracture in the outlet strut is the concern here. Experimental measurements are performed in order to evaluate the detection capability of the technique and the sensitivity of response signal to dimensional parameters of a fracture. A BSCC heart valve prototype having the electromagnetic characteristics of the Co-Cr (Hayness 25) alloy is inspected with a probe. A non-conductive defect is positioned in the outlet strut and its dimensions are varied. The probe is positioned above the centre of the crack and the frequency of exciting signal is changed in a wide range. The presented results demonstrate that the sweep frequency technique can enhance eddy current inspection of a defect in BSCC heart valve.
Thermal analysis of LED lighting system with different fin heat sinks

This paper designs a 3 × 3 light emitting diode (LED)array with a total power of 9 W, presents a thermal analysis of plate fin, in-line and staggered pin fin heat sinks for a high power LED lighting system, and develops a 3D one-fourth finite element (FE) model to predict the system temperature distribution. Three kinds of heat sinks are compared under the same conditions. It is found that LED chip junction temperature is 48.978 °C when the fins of heat sink are aligned alternately.
Marine Geology and Sand Resources of the Southern North Carolina Inner Shelf

Abstract Beach nourishment is a popular engineering-with-nature (EWN) strategy used globally for shoreline stabilization and coastal storm damage reduction. Large-scale projects require dredging from offshore sand borrow sources. However, suitable sands for nourishment are not ubiquitous offshore, especially in sediment-starved southern NC. In 2015, >300 nautical miles (555 km) of sub-bottom, sidescan, bathymetry and 38 cores/grabs were collected in data gaps offshore southern NC and interpreted for geologic horizons and potential nourishment-compatible sand thickness. In addition, hundreds of paleochannels were mapped and evaluated for fill patterns and resource potential. Various forms of hardbottom were delineated, sometimes in close proximity to sand resources. Results show high spatial variability in the distribution of beach-compatible sands across the southern NC shelf, where only a thin sand veneer is observed in many locations, although some regions contained continuous deposits exceeding 3 m. The thickest shoal deposits (>5 m) were observed offshore New Hanover County Region. Underlying strata and bathymetry appear to affect channel shape and distribution. Channels with acoustically transparent fill may be suitable as nourishment sources, yet many channels show complex and variable fill suggestive of tidal and estuarine environments. Seafloor reconnaissance data are valuable in preventing multi-use conflicts on the shelf as shelf areas are increasingly being explored for other functions (e.g, wind farms, oil/gas, fish habitat). These findings provide a useful starting point for coastal managers seeking sufficient offshore sediment resources for nourishment in response to future storm events and sea-level rise.
A Note on Service Design Methodology

Due to environmental focuses and pursuit for better economic performance, service and product-service systems are gaining interest. While there exist a variety of product design methodologies, there is no design methodology for service. This paper proposes a design methodology of service. First, service elements are discussed such as service environment, service provider, service receiver, service channel, service contents, service goal, and service quality. Then, service is given a formal definition that it is an activity that a service provider offers to a service receiver in a service environment and generates values for the service receiver. Second, service is classified into five different categories and servicification is discussed. Having identified these concepts of service, we then discuss service engineering as a method to increase added value of service. We then introduce three different ways to do so and they are service design methodologies; first to give best fit service, second to increase the service quality, and third to develop a new service. Finally, we illustrate an example of service design.Copyright © 2004 by ASME
Invading Testing System Based on Clustering and HMM Distributed

In the invading testing, the testing of unknown is mainly accomplished by the abnormal testing. Traditional abnormal testing methods need to construct a normal behavior feature outline reference mode. When establish this mode, it is needed to have large amount of pure normal data set, and this data set usually is not easy to gain from the real network. Whats worse, the problem of too much error reports and leaking reports in the abnormal testing is pervasive. In order to overcome this shortage, this paper rises a abnormal testing method which is combine clustering analysis and HMM. This method doesnt need any training data set of manual marking; it can explore many different types of invading behaviors. The experimental results indicate that this method has better effect on the testing, which is of a higher testing rate and lower error report rate.
An analytic approach for optimal coordination of overcurrent relays

This study presents a new analytic approach to optimal coordination of directional overcurrent relays. This approach is based on the selection of optimum pickup current and time dial setting, in order to obtain minimum operating time for the relays, while satisfying various coordination and boundary constraints. Based on the new optimal relay setting procedure, an iterative numerical solution is proposed. The proposed numerical algorithm converges to the global optimum values, which are independent of initial values and the order of relay setting. The proposed method is applied to three different test systems. The new method is compared with some previously proposed analytic and evolutionary approaches. The results demonstrate the advantages of the proposed method over the previous works.
Automatic identification of spatial defect patterns for semiconductor manufacturing

This research proposes an on-line diagnosis system based on denoising and clustering techniques to identify spatial defect patterns for semiconductor manufacturing. Today, even with highly automated and precisely monitored facilities used in a near dust-free clean room and operated with well-trained process engineers, the occurrence of spatial signatures on the wafer still cannot be avoided. Typical defect patterns shown on the wafer, including edge ring, linear scratch, zone type and mixed type, usually contain important information for quality engineers to remove their root causes of failures. In this paper, a spatial filter is simultaneously used to judge whether the input data contains any systematic cluster and to extract it from the noisy input. Then, an integrated clustering scheme combining fuzzy C means (FCM) with hierarchical linkage is adopted to separate various types of defect patterns. Furthermore, a decision tree based on two cluster features (convexity and eigenvalue ratio) is applied to a separated pattern to provide decision support for quality engineers. Experimental results show that both real dataset and synthetic dataset have been successfully extracted and classified. More importantly, the proposed method has potential to be further applied to other industries, such as liquid crystal display (LCD) and plasma display panel (PDP).
Conductive-cooled 2micron laser for CO2 and wind observations

We have developed 2micron Q-switched lasers with conductive-cooled side pumped laser head. Q-switched output of 100mJ at 20Hz has been achieved in a Tm,Ho:YLF laser oscillator with a composite rod. The experiments showed that very good thermal conduction is held between rod and heat sink. This laser head may be used for laser amplifier of 500mJ output. Another type of Tm,Ho:YLF laser head has been developed for the oscillator of 50-100mJ output at 20-40Hz. These 2micron lasers are applied to coherent lidar systems, which will be used to measure atmospheric CO2 and wind profiling.
Developing radical innovation in telecommunications : an R&D management perspective

Radical innovation has been identified as one of the central topics of innovation management, being relevant to the development process, the categories, and the R&D department’s responsibilities for development. Based on the above three individual research conversations, this research aimed to determine, when the R&D department of a large telecommunications operator engaged in radical innovation, which capabilities they used and how the use of these capabilities was affected by different contextual factors at each stage of the radical innovation development cycle. By comparing the aim of the current research with other researchers’ findings on relevant topics, three gaps in the research were identified, and two research questions were raised, as below: • RQ1: What capabilities do the R&D department of an STO use for each separate activity during its radical innovation development process? • RQ2: Within the radical innovation development process of an STO, which contextual factors explain the differential uses of the R&D department’s capabilities? Following the above research questions and based on the philosophical views of interpretivism and social constructivism, this PhD study uses a qualitative research strategy and a case study research approach for guiding the research design. Based on the data collected from 29 interviews plus a three-month, full-time participant observation, four case studies were conducted, which are the telematics service within China Mobile, the Xi-He system within China Telecom, and 21CN and BT Fusion within British Telecom (BT). By comparing the four cases, the R&D departments’ uses of capabilities in each separate activity of its radical innovation development cycle were identified, and the reasons for the different uses of these capabilities were described in relation to six contextual factors derived from the literature. Based on the four case studies and the data analysis, from the perspective of the R&D department eight theoretical propositions were put forward for an STO to develop its radical innovation. The propositions concerned the capabilities involved at each stage of the R&D department’s radical innovation development cycle, as well as the contextual factors that played the most significant roles in affecting these capabilities at all of the radical innovation development stages. In addition to the eight theoretical propositions, practically, five guidelines were also proposed in this study, which contributes to the understanding of the R&D managers and strategy people of other Chinese and British STOs, in terms of the impacts that the contextual factor of cultural contexts would have on their radical innovation development activities.
Les déterminants de l'innovation dans les services: une analyse à partir des formes d'innovation

This article makes a study of the influence of innovation determinants on their ability to innovate and the different types of innovation (technological and non-technological) developed within service sector. The statistics are provided from the community Innovation Survey. The estimation method is a probit with selection from the framework proposed by Heckman (1979) and refined by Van De Ven and Van Praag (1981). The first equation explains the innovative capacity and the second explicates the implementation of different types of innovation (technological and / or non-technological). The analysis focuses on the comparison of innovation behaviors in service sector and industry. The results demonstrate that the determinants of innovation ability are similar for service sector and industry and the differences are issued from different forms of innovation developed. More precisely, it comes from the orientation of each sector towards more or less technological innovation. The results bring up the question of the appropriateness of current policies of innovation especially in R&D' promotion. The author proposes to take into account the consideration of different types of activities and innovation for this policy and suggests to focus on the lowtechnological but innovative and non-technological activities like intellectual services.
Security-constrained multiobjective generation dispatch using bicriterion global optimisation

The paper is devoted to the dynamic performance assessment and model reduction for longitudinal interconnected power systems. Based on this, simple expressions are established to represent variations of security levels with the power transfer between subsystems. These expressions are used to extend the authors' work on a bicriterion optimisation approach for determining the most appropriate generation-dispatch solution taking into account the fuel and environmental costs, and to provide security constraints/checks during optimisation.