bluuebunny/crossref_metadata_2025 huggingface dataset:
Methodologies for Sustainable Energy Action Plan design and monitoring applied to the Municipality of Avezzano, Abruzzo Region, Italy
Authors: Cinocca Andrea , Di Paolo Luca , Abbate Simona , Cipollone Roberto
Published: October 2020

The increasing attention and sensitivity to issues related to Global Warming and Climate Change are strengthening the actions and policies related to Sustainable Development trying to give to this concept a clearer engineering dimension. Not only policymakers are involved in this aim and experts of interdisciplinary aspects but also the irreplaceable involvement of citizens which with their behavior can make the difference and get much closer to the seventeen goals of the sustainable development by 2030. In this framework, the Territorial Energetic and Environmental Planning provides operational solidity to the concept of Sustainable Development, giving more responsibility to local administrations (as it is due according to subsidiarity), with the Central Government that guarantees the respect of the principles of Subsidiarity and Glocalization. Province of L’Aquila (in the Abruzzo Region, Italy) has been a leading player of this program and, in 2012, has realized the ambitious goal of having favored a Covenant, joining all the 108 Municipalities of the Province. Department of Industrial and Information Engineering and Economics (DIIIE) of the University of L’Aquila designed the Sustainable Energy Action Plants (SEAP) and the monitoring phase of all the Municipalities through a scientific methodology which matched the goal of SEAPs with the dimension of the Municipality. In order to go deep into SEAP’s analysis, in this paper Authors describes the second uploading and necessary steps: a quantitative analysis of the Baseline Emission Inventory, the quantification of the SEAPs planning actions and the definition of the Monitoring Emission Inventory. This second step was done for the Municipality of Avezzano, one of the main Municipality of the L’Aquila Province, and gave the quantitative dimension of the CO2 emissions referred to the year 2017, compared with 2005 baseline emissions. The reduction commitments to be reached in 2020 defines the present distance to the target.
On the prospects of improving the numerical analysis of symmetric airfoils at low Reynolds numbers and high angles of attack by a LES approach: the case of NACA0021 profile
Authors: Giaccherini Simone , Mariotti Filippo , Pinelli Lorenzo , Marconcini Michele , Bianchini Alessandro
Published: October 2020

The working conditions of airfoils along modern wind turbine blades are putting new focus on the importance of properly characterizing the aerodynamic performance of different airfoil families also at high angles of attack (AoAs) beyond stall and at Reynolds numbers much lower (from few thousands to one million) than those commonly analyzed before. Several test cases are showing that even higher-order computational methods (like RANS/URANS CFD) are unable to properly capture the complex flow physics taking place past the blades, when deep stall occurs or when the AoA changes so rapidly to provoke the onset of dynamic stall. To fill this gap, the use of high-fidelity methods, like the Large Eddy Simulation (LES) is proposed, even though it implies a massive increase of the calculation cost. In order to analyze the prospects of using LES in comparison to RANS for low Reynolds, high AoAs, this work presents an in-depth study of the NACA 0021 aerodynamics at the Reynolds number of 80,000, by means of both traditional RANS approaches and high-fidelity (LES) simulations using the OpenFOAM suite. The selected airfoil has been showing in fact several issues in the correct characterization of its performance in similar conditions in many recent wind energy applications. The LES approach showed the ability to overcome the limitations of traditional RANS simulations, improving the accuracy of the results and reducing their dispersion thanks to the fact that the flow structures in the separated-flow regions are properly captured. Overall, this work underlines that accurate investigations of the aerodynamic performance of the NACA 0021 at low Reynolds require multiple sensitivity studies when RANS approaches are used, and suggests the use of LES simulations in order to increase the accuracy of estimations, especially when studying the stalledflow operating conditions of the airfoil.
Performance Assessment of Multi-Electrodes Reactors for Scaling-up Microbial Fuel Cells
Authors: Minutillo Mariagiovanna , Nastro Rosa Anna , Di Micco Simona , Jannelli Elio , Cioffi Raffaele , Di Giuseppe Maria
Published: October 2020

The microbial fuel cells (MFCs) represent an emerging technology for converting directly organic waste into electricity. In recent years, the application of MFCs to the energy recovery from wastes has been widely explored. The main aspect that limits the development and implementation of this technology on a larger-scale is the possibility of realizing its scaling-up. In order to overcome this critical factor, it is useful to analyze novel MFCs configurations based on compact reactors with multiple electrodes.In this paper, single chamber MFCs provided with multiple fiber brush anodes and a single air-cathode were designed and realized by using a 3D printer. The reactors had a cubic shape, with a cylindrical chamber of 350 mL in volume. The mineral medium added with sodium acetate (0.25 M), as sole source of carbon and energy to sustain exoelectrogenic bacteria metabolism, were used. Anodes biofilms were prepared from a mix of compost and sodium acetate dissolved in phosphate buffer solution (0.2M), in a 1:3 ratio. The performances of two MFCs provided with two and three anodes were assessed in terms of voltage, current density and power density. These performances were compared to those of a smaller cubic MFC (30mL).
Assessment of the impact of nanosecond plasma discharge on the combustion of methane air flames
Authors: Fontanarosa Donato , Mehdi Ghazanfar , De Giorgi Maria Grazia , Ficarella Antonio
Published: October 2020

At present, development of plasma assisted ignition and combustion is a very promising research area due to its wide applications in the field of aeronautical engines and power sector. Plasma discharge can improve the combustion because it produces large number of chemically active particles which affects the chemical reaction. Simulation is an effective tool to analyze the interaction between the plasma and the flame through the implementation of plasma-assisted combustion. This study focused on three main objectives. Initially a microscopic plasma model with detailed kinetic plasma mechanisms was developed, then the validation of these mechanisms in air/methane mixture has been performed. Finally, the effects of nano pulsed plasma discharge on combustion have been investigated. In order to accomplish the above task, two numerical tools Chemical Kinetic Solver (CHEMKIN) and Plasma Kinetic Solver (ZDPlasKin) are used. It was found that the kinetic model of plasma provides good overall agreement with experimental data and identify key processes for species (e.g. O atom) generation and decay. The results showed that with the increase of reduced electric field, active particles and intermediate species/radicals (in particular ozone) are increased. ZDPlasKin results were incorporated in CHEMKIN to investigate and compare the flame speed, thermal and chemical effect by using a GRI-Mech scheme modified with the addition of ozone reactions. It has been found that with the adding of plasma flame speed was increased up to 26% at stoichiometric ratio. The chemical heat release also showed increment at low temperatures that confirmed the combustion enhancement. Furthermore, ignition delay timings were significantly reduced with the plasma excitation.
Data-Driven Air-Cooled Condenser Performance Assessment: Model and Input Variable Selection Comparison
Authors: Ghettini Simone , Sorce Alessandro , Sacile Roberto
Published: October 2020

This paper presents a data–driven model for the estimation of the performance of an aircooled steam condenser (ACC) with the aim to develop an efficient online monitoring, summarized by the condenser pressure (or vacuum) as Key Performance Indicator. The estimation of the ACC performance model was based on different dataset from three different combined cycle power plants with a gross power of above 380 MWe each, focusing on stationary condition of the steam turbine. The datasets include both boundary (e.g. Ambient Temperature, Wind Speed) and operative parameters (e.g. steam mass flow rate, Steam turbine power, electrical load of the ACC fans) acquired from the power plants and some derived variable as the incondensable fraction, which calculation is here proposed as additional parameter. After a preliminary sensitivity analysis on data correlation, the paper focuses on the evaluation of different ACC Condenser models: Semi-Empirical model is described trough curves typically based on steam mass flow rate (or condenser load) and the ambient temperature as main parameters. Since monitoring based on ACC design curves Semi-Empirical models, provides biased poor results, with an error of about 15%, the curves parameters were estimated basing on training data set. Other two data driven models were presented, basing on a neural network modelling and multi linear regression technique and compared on the base of the reduced number of input at first and then including aldo the other process variables in the prediction of the condenser back pressure. Estimate the parameters of the Semi-Empirical model, results in a better prediction if just steam mass flow rate and ambient temperature are available, with an error of the 7%, thanks to the knowledge contained within the “curves shapes”, with respect to linear regression (8.3%) and Neural Network models (7.6%). Higher accuracy can be then obtained by considering a larger number of operative parameters and exploiting more complex data-driven model. With a higher number of features, the neural network model has proved a higher accuracy than the linear regression model. In fact, the mean percentage error of the NN model (2.6%), in all plant operating conditions, is slightly lower than the error of the linear regression model, but presents and much lower than the mean error of the Semi-Empirical model thanks to the additional data-based knowledge.
Refrigerant selection for ejector refrigeration systems: a multiscale evaluation
Authors: Besagni Giorgio , Croci Lorenzo , Cristiani Nicolò , Guédon Gaël Raymond , Inzoli Fabio
Published: October 2020

The selection of refrigerants for ejector refrigeration systems, within the broader discussion concerning refrigerant phase-out, is a cutting-edge and challenging research topic, owing to the multi-scale challenges in ejector performance. Indeed, it is known that the performances of ejector refrigeration systems depend on the local flow phenomena. For this reason, a precise selection of the refrigerant relies on the understanding of the fluid dynamic phenomena at the “componentscale”, and integrate such information within the so-called “system-scale”. This paper contributes to the current discussion proposing a screening of refrigerants based on an integrated Computational Fluid Dynamic (CFD) Lumped Parameter Model (LPM) approach. In this approach, ejector performances for the different refrigerant are obtained by a validated CFD approach, whereas the cycle is modelled by a Lumped Parameter Model. For the different refrigerants, the energy performances of the systems are evaluated and the effects of the “component-scale” on the “system-scale” are analysed.
A Quasi-dimensional Numerical Investigation of the Scroll Expander of an Organic Rankine Cycle Unit
Authors: Cantiani Antonio , Viggiano Annarita , Fanelli Emanuele , Magi Vinicio
Published: October 2020

Scroll compressors are often used in air conditioning and refrigeration systems thanks to their high efficiency, low noise and vibrations, light weight and high reliability. Scrolls are also widely used as positive displacement expanders in small-scale power generation systems, such as Organic Rankine Cycles (ORCs). In recent years, the research has focused on the development of mathematical models that help to predict the scroll expander performances under different operating conditions. In this work, a quasi-dimensional model of a scroll expander of an Organic Rankine Cycle unit is presented. Such an expander consists of two identical circle involute spirals, with appropriate starting segments. Specifically, the model is able to design the scroll expander geometry with either a “circular cutter” or a “perfect mesh profile” (PMP) approach, which are two of the most common scroll geometry starting segments. As regards the thermo-fluid dynamic aspects, specific sub-models have been used to account for radial and axial leakage, wall heat transfer, intake and exhaust of the working fluid. The model has been validated with available experimental data in order to assess its accuracy and, at the same time, to calibrate the implemented sub-models. The influence of some geometrical parameters on the expander performances has been assessed. In particular, a study of the influence of the wrap geometry is presented. The results show that the circular cutter approach returns better performances at the expenses of a higher mass consumption. Nevertheless, the circular cutter modification returns a higher specific work. Lastly, the influence of one of the PMP parameters on performances has been assessed. The results show a fairly strong dependence of both mechanical power and specific work, suggesting that the global optimization of all geometric parameters of the scroll expander may radically improve its performances.
Aerodynamical Performance Decay Due to Fouling and Erosion in Axial Compressor for GT Aeroengines
Authors: De Pratti Giovanni Maria
Published: October 2020

The ingestion of solid abrasive particles and/or foulants causes erosion of the compressor blades, resulting in a considerable reduction in the performance and working life of aviation/heavy duty GT and an increase in fuel consumption. The geometry variation at the Leading Edge (L.E. blunting) and Trailing Edge (T.E. thickness reduction), together with the general increase of airfoil surface roughness, depends on the characteristics of the incident particles, the geometry and the materials of the blade cascade, the dynamic parameters of the particles and on the type of impact. In order to rectify this degradation in performance, it is therefore necessary to re-profile the blades with machining that is highly critical for the performance of the engine, the life of the compressor blades and for maintenance costs. In order to determine an optimum and cost effective process of reprofiling, a series of tests reproducing the corresponding models of flow have been carried out on the Water Table Test Bench using Lamb’s hydraulic analogy relative to profiles of the VII and VIII stage HP of the compressor of the GT CF6-50 (G.E. Co.). The tests were carried out both on the isolated airfoil profile and on the blade cascade and both in the original conditions, at varied geometry (because of erosion and/or fouling) and after re-profiling. The trajectories of the particles have been visualised in several ways (like a false color photographic procedure), confirming results reported by various authors related to the model of impact and erosion. Particularly in the case of the dust aspiration during the arrival phase on the deck of an aircraft carrier. The test results have been discussed and compared with those available in scientific literature.
Airfoil to Improve Aerodynamic Performance OF Aileron Reduced Spanwise in Combat Helicopter
Authors: De Pratti Giovanni Maria
Published: October 2020

Combat helicopters frequently operate in the part of Planetary Boundary Layer (PBL) characterised by the presence of dust and many other aggressive agents, particularly, in desertic areas and in marine sites, so the aerodynamic performance of their ailerons reduced spanwise, carrying out weapon systems, may be reduced within unacceptable values and consequent relevant risks for the stability of the copter. According to some experts, ailerons for weapon systems of helicopter are not involved in the global lift of the copter, but their operative function is only to carry the combat systems..Nevertheless, some crash occurred to US combat helicopters suggest a different point of view, and an aileron damage, perhaps due to a kind of dynamic stall phenomenon, seems have been caused the copter fall. These problems may be avoided using particularly airfoil for the section of aileron instead of classic ones as NACA four digit series (as 00120018). These profiles may be FFA-W1-XXX series, characterised by a double curvature of camber-line.

In the present paper, after a deep analysis of operative conditions of modern combat helicopters, the aerodynamic performance of aileron section as NACA 0018 and FFA-W1-182 have been analysed and compared, and the results of tests carried out on a water table test bench are exposed and discusses.
Experimental Assessment of Fouling Effects in a Multistage Axial Compressor
Authors: Casari Nicola , Pinelli Michele , Spina Pier Ruggero , Suman Alessio , Vulpio Alessandro
Published: October 2020

The study of the adhesion of micro sized particles to gas turbine internal surfaces, commonly known as gas turbine fouling, has gained increasing attention in the last years due to its dramatic effect on machine performance and reliability. On-field fouling analysis is mostly related to visual inspections during overhaul and/or programmed stops, which are performed, in particular, when gas turbine performance degradation falls under predetermined thresholds. However, these analyses, even if performed in the most complete as possible way, are rarely (or never) related to the conditions under which the gas turbine contamination takes place since the affecting parameters are difficult or even impossible to be adequately monitored. In the present work, a small scale multistage axial compressor is used to experimentally simulate the fouling phenomenon. The test rig allows the accurate control of the most relevant operating parameters which influence the fouling phenomenon. The compressor performance loss due to particle contamination has been quantitatively assessed. Soot particles appear stickier, especially in the presence of high humidity, and represent the most harmful operating conditions for the compressor unit. The deposits on the stator vanes and the rotor blades have been detected and post-processed, highlighting the most affected regions of each compressor stage employing an image analysis package tool.
FSI analysis and simulation of flexible blades in a Wells turbine for wave energy conversion
Authors: Barnabei Valerio Francesco , Castorrini Alessio , Corsini Alessandro , Rispoli Franco
Published: October 2020

In this paper a preliminary design and a 2D computational fluidstructure interaction (FSI) simulation of a flexible blade for a Wells turbine is presented, by means of stabilized finite elements and a strongly coupled approaches for the multi-physics analysis. The main objective is to observe the behaviour of the flexible blades, and to evaluate the eventual occurrence of aeroelastic effects and unstable feedbacks in the coupled dynamics. A series of configurations for the same blade geometry, each one characterized by a different material and mechanical properties distribution will be compared. Results will be given in terms of total pressure difference, supported by a flow survey. The analysis is performed using an in-house build software, featured of parallel scalability and structured to easy implement coupled multiphysical systems. The adopted models for the FSI simulation are the Residual Based Variational MultiScale method for the Navier-Stokes equations, the Total Lagrangian formulation for the nonlinear elasticity problem, and the Solid Extension Mesh Moving technique for the moving mesh algorithm.
The exploitation of CFD legacy for the meridional analysis and design of modern gas and steam turbines
Authors: Ricci Martina , Pacciani Roberto , Marconcini Michele
Published: October 2020

In the last decades, the consolidation of 3D CFD approaches in the industrial design practices has progressively moved throughflow codes from the top of design systems to somewhere in between first development stages and the final aerodynamic optimizations. Despite this trend and the typical limitations of traditional throughflow methods, designers tend to still consider such methods as fundamental tools for drafting a credible aero-design in a short turnaround time. Recently a considerable attention has been devoted to CFDbased throughflow codes as suitable means to widen the range of applicability of these tools while smoothing the predictive gap with successive threedimensional flow analyses.

The present paper retraces the development and some applications of a modern and complete CFD-based throughflow solver specifically tuned for multistage axial turbine design. The code solves the axisymmetric Euler equations with an original treatment of tangential blockage and body force. It inherits its numerical scheme from a state-of-the-art CFD solver (TRAF code) and incorporates real gas capabilities, three-dimensional flow features (e.g. secondary flows, tip leakage effects), coolant flow injections, and radial mixing models. Also geometric features of actual blades, like fillets, part-span shrouds, and snubbers, are accounted for by suitable models.

The capabilities of the code are demonstrated by discussing a significant range of test cases and industrial applications. They include single stage configurations and entire multistage modules of steam turbines, with flow conditions ranging from subsonic to supersonic. Computational strategies for design and off-design analyses will be presented and discussed. The reliability and accuracy of the method is assessed by comparing throughflow results with 3D CFD calculations and experimental data. A good agreement in terms of overall performance and spanwise distributions is achieved in both design and off-design operating conditions.
Using different machine learning approaches to evaluate performance on spare parts request for aircraft engines
Authors: Capodieci Antonio , Caricato Antonio , Carlucci Antonio Paolo , Ficarella Antonio , Mainetti Luca , Vergallo Cristian
Published: October 2020

The Aircraft uptime is getting increasingly important as the transport solutions become more complex and the transport industry seeks new ways of being competitive. To reach this objective, traditional Fleet Management systems are gradually extended with new features to improve reliability and then provide better maintenance planning. Main goal of this work is the development of iterative algorithms based on Artificial Intelligence to define the engine removal plan and its maintenance work, optimizing engine availability at the customer and maintenance costs, as well as obtaining a procurement plan of integrated parts with planning of interventions and implementation of a maintenance strategy. In order to reach this goal, Machine Learning has been applied on a workshop dataset with the aim to optimize warehouse spare parts number, costs and lead-time. This dataset consists of the repair history of a specific engine type, from several years and several fleets, and contains information like repair claim, engine working time, forensic evidences and general information about processed spare parts. Using these data as input, several Machine Learning models have been built in order to predict the repair state of each spare part for a better warehouse handling. A multi-label classification approach has been used in order to build and train, for each spare part, a Machine Learning model that predicts the part repair state as a multiclass classifier does. Mainly, each classifier is requested to predict the repair state (classified as “Efficient”, “Repaired” or “Replaced”) of the corresponding part, starting from two variables: the repairing claim and the engine working time. Then, global results have been evaluated using the Confusion Matrix, from which Accuracy, Precision, Recall and F1-Score metrics are retrieved, in order to analyse the cost of incorrect prediction. These metrics are calculated for each spare part related model on test sets and, then, a final single performance value is obtained by averaging results. In this way, three Machine Learning models (Naïve Bayes, Logistic Regression and Random Forest classifiers) are applied and results are compared. Naïve Bayes and Logistic Regression, that are fully probabilistic methods, have best global performances with an accuracy value of almost 80%, making the models being correct most of the times.
Influencing factors of Solid Waste Management global cost and efficiency: a multi-objective optimization focusing on the collection system
Authors: Russo Sofia , Verda Vittorio
Published: October 2020

Development of an Integrated Solid Waste Management (ISWM) system is a continuous challenge for local communities. These systems should be properly designed, paying particular attention to the optimal connection of their subsystems. Among them, the Solid Waste (SW) collection system has a primary influence. The design variables (e.g. unit collection basin and weekly removal) can be optimized according to the variation of external parameters (e.g. penetration of selective collection, population density). The objective is the minimization of specific collection cost, maintaining the maximum collection efficiency. Once the collection system is optimized, its influence on the entire SW treatment chain is evaluated. To this end, a multi-objective optimization is implemented taking into account the global cost and exergy efficiency of waste treatment. The analysed system is composed by a paper recycling plant for cardboard production and a Mechanical Biological Treatment plant for the Residual Unsorted Waste treatment, with production of Refused Derived Fuel.
Soil Moisture Characteristics of a Typical Slope in the Watershed of the Loess Plateau for Gully Land Consolidation Project
Authors: Shan Yulin , Xie Jiancang , Lei Na , Dong Qiguang
Published: October 2020

To clarify the characteristics of soil moisture in the slope of watershed of the gully land consolidation watershed, and to further guide the implementation of the gully land consolidation project and vegetation restoration in this area, this study selected a typical slope of gully land consolidation watershed as the research object. The soil moisture of different slope positions was monitored and analyzed, and its temporal stability was analyzed. The results showed that: 1) The average soil moisture of different slope positions increased with the increase of soil depth, and the variability showed an increasing-decreasing-increasing trend, and the variability was the smallest at about 70 cm from the surface with weak variability, and the soil moisture variability in other layers is moderate. 2) On the slope, the distribution characteristics of soil moisture content were as follows: upslope <middleslope <downslope position. The differences of soil moisture between the upslope and downslope, midslope and downslope were significant. 3) The temporal stability analysis of the soil moisture showed that there is high stability between August and September of the soil moisture of the 0-50 cm and the correlation is extremely significant, while the soil moisture content of 50-100 cm range has a significant correlation between May and June. 4) The time stability of soil moisture in the middle slope position is the highest, followed by the upslope position, and the time stability in the downslope position is the lowest. 5) The best time stability point in the study area is the M3 point of the middle slope.
Analysis of the features and causes of the contamination in the Shandi River basin
Authors: Shi Hong , Zhang Yongbo , Tang Li
Published: October 2020

This study examined the contamination of the surface water in the Shandi River basin in Yangquan, Shanxi province. A total of 11 sampling points (numbered S1-S2, S3-S4, S5–S11) were selected from the upstream to the downstream of the river, and 19 indexes were selected for inspection to identify the causes and features of contaminated water in the basin. The Nemerow Pollution Index was applied to evaluate the quality of the surface water and the overall extent of contamination in the basin. The result revealed that the content of Cl-, As, Cr6+, CN-, and volatile phenols met the grade III water quality standards in China, and the remaining indexes exceeded the standards by varying degrees. The five sources of contamination in the basin negatively affect the environment. The presence of contaminants at the sampling points was in the following order, from highest to lowest: SO42-= Mn = NH3-N> Fe2+= Hg >Fe3+> Cd > Zn = F->COD>NO3 -= NO2-. The severity of the comprehensive contamination indexes decreased in the order of S6 > S9 > S7 > S11 > S10 > S3 > S8 > S5 >S4.
An improved prediction method of water consumption rate considering aftereffects for short-term dispatching of hydropower station
Authors: Chen Xiao , Zhou Jianzhong , Jia Benjun , Yang Yuqi , Li Li
Published: October 2020

Accurate and rapid output calculation of hydropower station (HS) is an important research item in reservoir dispatching neighborhood. There have existed many methods to calculate output in generation scheduling models with different time scale. But for the large HS with multiple units, it is still difficult to calculate output quickly and accurately in short-term generation dispatching. Therefore, in this paper, an improved method of water consumption rate (IWCR) considering aftereffects is proposed. The Three Gorges Hydropower Station (TGHS) in China is selected as the case study, and the prediction water consumption rate (WCR) results are obtained with IWCR and classical water consumption rate method (CWCR). The results show that 1) The mean absolute deviation (MAD) on the left and right bank of TGHS is significantly superior to the MAD calculated by CWCR, and reduce 0.578 m3/(s.wkw) and 0.569 m3/(s.wkw) respectively. 2) In low relative deviation interval, there are more prediction WCR periods with IWCR. Therefore, the IWCR method can lead to the plan scheme more consistent with actual operation process, and the security of TGHS and Gezhouba is stronger.
Design and Construction of Urban Waste Intelligent Treatment System
Authors: Zhou Xi , Wang Mengnan , Deng Dexiang , Li Xi
Published: October 2020

With the rapid expansion of urban scale, urban waste disposal has become an important issue for ecological environment construction. In order to seek the coordinated development of economy and environment, we systematically intervene in urban waste intelligent treatment plans and management through design thinking and methods, and build urban waste intelligent treatment systems to achieve waste volume control, waste monitoring, classified collection, stacking and transportation, processing and Reprocessing production forms a controllable intelligent operation chain, which realizes the collaboration of human brain intelligence and artificial intelligence to improve the level of urban waste treatment and management capabilities.
A Preliminary Study on The Prevention and Control of Seawater Intrusion in Northern Pingtan Island with Freshwater Recharge Curtain
Authors: Diao Mengyao , Li Panlin , Ruan Weifang , Li Wanglin
Published: October 2020

Seawater intrusion caused by groundwater over-exploitation is a kind of geological disaster caused by human economic activities and natural environment changes. Using freshwater recharge curtain technology is an effective means to prevent seawater intrusion. Based on the analysis of the characteristics of seawater intrusion in Pingtan island, Fujian Province, and in view of the possible seawater intrusion problems in the construction of Luyangpu underground reservoir in Pingtan Island, this paper expounds the basic principle of seawater intrusion prevention with freshwater recharge curtain , the technical measures of installing a row of recharge wells in the northern coastal zone of Luyangpu plain in Pingtan Island and using freshwater recharge curtain are put forward to prevent seawater intrusion. Through groundwater numerical simulation, the dynamic distribution of groundwater level in the north of Pingtan Island in the next 20 years is analyzed and predicted. The results show that the seawater intrusion can be effectively prevented by installing freshwater curtain recharge wells in the northern coast of Luyangpu.
An overview of resource utilization of steel slag as absorbent material for waste water treatment
Authors: Yu Chan , Zhang Wei , Gao Fei , Huang Huawei , Zhao Liangyuan
Published: October 2020

With the rapid development of the steel industry, the accumulation of steel slag increases year by year, occupying a large amount of farm land and leading the problem of environmental pollution and safety hazards. The current comprehensive utilization rate of steel slag is still very low in China, far behind the developed countries. The low comprehensive utilization rate of steel slag is a stumbling block to the green and sustainable development of the Yangtze River Economic Belt. Improving the comprehensive utilization rate of steel slag is an imperative way to resolve these problems and to realize sustainable development for the steel enterprise. Steel slag presents porous structure and large surface area; in addition, it is easy to separate from water due to its high density. Therefore, the application of steel slag in industrial waste water treatment has received intensive attention in recent years. This paper systematically introduced the research progress of steel slag resource utilization as absorbent materials for waste water and proposed the important improved method and critical problems for steel slag as absorbent materials.
Status, Challenges and Strategies of Dar es Salaam Seaport-Hinterland Connectivity
Authors: Juma Mwendapole Msabaha , Zhihong Jin
Published: October 2020

Dar es Salaam seaport serving the Tanzania hinterland and other seven landlocked countries in East and Central Africa, The rapid economic growth of the hinterlands resulted to the increasing demand for overseas products from their country’s residents, this create congestion at Dar es Salaam seaport. Due to this, the connection for the movement of commodities from seaport to its hinterland has noticeably very slow. A qualitative research methodology technique is used in this article to explore the status, challenges and strategies of Dar es Salaam seaport-hinterland connectivity. The findings reveal that even though Dar es Salaam seaport is linked to the hinterland through both railway and road transport, but is hugely dependent on road transport. Regular tariffs increase for imports, insufficient number of trains and wagons connecting Dar es Salaam seaport, poor qualities of roads and railway infrastructures, congestion at the roads and the absence of new freight station are the main existing challenges in which significantly affect the smoothness of Dar es Salaam seaport-hinterland connectivity. Furthermore, the article proposes various enhancing strategies to combat named challenges. These strategies will be crucial to the government in decision making on how to develop and advancing Dar es Salaam seaport-hinterland connectivity.
Research on the Evaluation Index System of the Taxi Operation and Service in Airport Hubs
Authors: Zhong Min , Liu Yi
Published: October 2020

Passengers changing to taxis in airport hubs are facing problems such as complicated transfer lines, long transfer distance and time, stranded at taxi stands, and imperfect emergency safeguard measures. Combining with the trend of smart passenger services under the development of new generation of information technology, this paper constructs a set of taxi operation and service evaluation index system reflecting unique attributes of the airport hub collection and distribution system. The index system considers the rationality of taxi infrastructure configuration, the matching of passenger service facilities, collection and distribution efficiency, transfer efficiency, etc. It also discusses index quantification and evaluation methods. Aiming at the real-time prediction of inbound flight passenger flow, taxi sharing rate and taxi capacity, the realization process of prediction models is proposed based on the big data method. Meanwhile, combining with the combing of comprehensive transportation operation information systems of hubs, it proposes to extract data from information systems to calculate some index values. The establishment of this index system can provide a strong reference for the evaluation of other transportation modes and the overall hub, and provide decision support for the optimization and improvement of taxi dispatch and overall operation and service of airport hubs.
Pricing Strategies of Supply Chain with Dual-Channel Retailer and Information Asymmetry
Authors: Hou Heyin , Li Yali
Published: October 2020

The equilibrium pricing strategies of supply chain with dual-channel retailer and information asymmetry are studied. The results show that information sharing is always beneficial to retailers, and the value of information sharing is always non-negative. But there are conditions under which manufacturers can share information.
Aktiv gegen Bewegungsmangel – Tätigkeitsfeld Schule
Authors: Basner Fritz
Published: October 2020

Physiotherapeuten, die ergänzend zum Sportunterricht Bewegungsstunden an Schulen anbieten, sind heute eher selten. Eine vertane Chance, findet Kinder- und Sportphysiotherapeut Fritz Basner. Für ihn ist es eine Herzensangelegenheit, Kinder an ein aktives Leben heranzuführen. Dafür kooperiert er erfolgreich mit Kindergärten und Schulen.
Geschichten für die Seele – Das Gute erkennen
Authors: Freitag-Herse Barbara
Published: October 2020

Mit schwierigen Situationen umzugehen, liegt uns Therapeuten im Blut. Selbst die Krise, in die wir durch die Corona-Pandemie hineingeschlittert sind, können wir bewältigen – wenn wir es schaffen, all die positiven Dinge, die trotzdem noch geschehen, nicht aus den Augen verlieren. Viele Therapeuten haben mir ihre Geschichten geschickt, die ich hier gern mit Ihnen teile.
Digital und ambulant gehen Hand in Hand – Chancen und Herausforderungen einer telemedizinisch gestützten Tagesklinik
Authors: Witt Victoria , Hoffmann Ann-Kristin , Ecke Jule , Kirchner Anja , Hauptmann Björn
Published: October 2020

Patienten mit Parkinson eine spezialisierte und effektive Physiotherapie bieten – nicht immer eine leichte Aufgabe. Gründe gibt es neben dem Therapeutenmangel genügend. Eine Parkinson-Fachklinik in Schleswig-Holstein hat sich dieses Ziel auf die Fahne geschrieben und leistet mit dem Projekt TIZIAN (telemedizinisch gestützte Tagesklinik) ganze Arbeit.
Confocal endomicroscopy for evaluation of pancreatic cystic lesions: a systematic review and international Delphi consensus report
Authors: Napoleon Bertrand , Krishna Somashekar G. , Marco Bruno , Carr-Locke David , Chang Kenneth J. , Ginès Àngels , Gress Frank G. , Larghi Alberto , Oppong Kofi W. , Palazzo Laurent , Kongkam Pradermchai , Robles-Medranda Carlos , Sejpal Divyesh , Tan Damien , Brugge William R.
Published: October 2020

Background and study aims The aim of thi systematic review and consensus report is to standardize the practice of endoscopic ultrasound (EUS-guided needle-based confocal laser endomicroscopy (nCLE) for pancreatic cystic lesion (PCL) evaluation.

Methods We performed an international, systematic, evidence-based review of the applications, outcomes, procedural processes, indications, training, and credentialing of EUS-nCLE in management of PCLs. Based on available clinical evidence, preliminary nCLE consensus statements (nCLE-CS) were developed by an international panel of 15 experts in pancreatic diseases. These statements were then voted and edited by using a modified Delphi approach. An a priori threshold of 80 % agreement was used to establish consensus for each statement.

Results Sixteen nCLE-CS were discussed. Thirteen (81 %) nCLE-CS reached consensus addressing indications (non-communication PCL meeting criteria for EUS-FNA or with prior non-diagnostic EUS-FNA), diagnostic outcomes (improved accuracy for mucinous PCLs and serous cystadenomas with substantial interobserver agreement of image patterns), low incidence of adverse events (fluorescein-associated and pancreatitis), procedural processes (nCLE duration, manipulation of needle with probe), and training (physician knowledge and competence).

Conclusion Based on a high level of agreement pertaining to expert consensus statements, this report standardizes the practice of EUS-nCLE. EUS-nCLE should be systematically considered when EUS-FNA is indicated for PCL evaluation.
Extrakorporale Kreislaufunterstützung – auch bei geriatrischen Patienten sinnvoll?
Authors: Seeger Florian H. , Rittger Harald
Published: October 2020

Im kardiogenen Schock liegt eine inadäquate Endorganperfusion aufgrund einer systolisch stark eingeschränkten kardialen Leistungsfähigkeit vor. Die Prognose ist äußerst kritisch und die Sterblichkeit bei Patienten im schweren kardiogenen Schock ist weiterhin hoch. Das folgende Multiorganversagen determiniert zumeist die Prognose der Patienten. In diesen Fällen können extrakorporale Kreislaufunterstützungssysteme die Herzfunktion bis zu einem gewissen Maß unterstützen oder sogar ersetzen und dadurch die Mortalität senken. Inwieweit diese Möglichkeiten auch für ältere Patienten sinnhaft sind, bleibt Gegenstand einer andauernden Diskussion. Studien in dieser Situation sind schwer durchführbar, insbesondere bei älteren, „gerontokardiologischen“ Patienten, welche die am stärksten steigende Patientengruppe in unserer Fachrichtung darstellen. Daher ist die Datenlage sehr begrenzt. Hinzu kommen ethische Aspekte bei komplikationsträchtigen, teuren und limitierten Therapien. Der
Artikel versucht, den gegenwärtigen Stand der Evidenz darzustellen und auf die Besonderheiten bei dieser Patientengruppe einzugehen.
Endoscopic ultrasound-guided radiofrequency ablation for hepatocellular carcinoma in cirrhosis: a case report test for efficacy and future perspectives
Authors: de Nucci Germana , della Corte Cristina , Reati Raffaella , Imperatore Nicola , Arena Ilaria , Larghi Alberto , Manes Gianpiero
Published: October 2020

Background The percutaneous approach allows for effective and safe treatment of liver lesions. But in case of subcapsular or left segments location, this approach seems to be less effective or unsafe. Endoscopic ultrasound-guided radiofrequency ablation (EUS-RFA) is a new technique used to treat pancreatic and neuroendocrine tumors in patients unfit for surgery.

Methods Hereby, we describe the case of a 70-year-old patient with cirrhosis with a large subcapsular hepatocellular carcinoma (HCC) in II-III-IVb segments, in which surgery or percutaneous therapies were not feasible, treated with EUS-RFA. The HCC was treated using an EUS-RFA (EUSRA) system, which consists of a 19G water-cooled monopolar RFA needle and a dedicated generator system.

Results After a multidisciplinary discussion, the lesion was ablated in two different sessions, which resulted in destruction of about 70 % of neoplastic tissue. A second step surgery was required but initially refused by the patient.

Conclusions EUS-RFA could be an effective way to treat left hepatic lesions not manageable with conventional percutaneous methods. This case report does not highlight concerns about safety of this approach and this observation needs to be validated in a larger cohort of patients with cirrhosis.
Domain-Management der Herzinsuffizienz beim geriatrischen Patienten
Authors: Gielen Stephan
Published: October 2020

Geriatrische Patienten mit chronischer Herzinsuffizienz (CHI) sind aufgrund von Multimorbität, Einschränkungen der Mobilität und Kognition sowie reduzierter sozialer Netzwerke Hochrisikopatienten. Eine einfache kardiologisch fokussierte medikamentöse/interventionelle Behandlung führt daher oftmals nicht allein zum Ziel. Das vom American College of Cardiology vorgeschlagene System des Domain-Managements bei geriatrischen Patienten mit CHI ergänzt daher sinnvoll die strukturellen Versorgungskonzepte und gliedert die Problembereiche der Patienten in 4 große Blöcke:

Durch systematische Bearbeitung der 4 Blöcke reduziert sich das Risiko, prognoserelevante Probleme zu übersehen, erheblich.

Insgesamt bietet das Domain-Management einen Ansatz, die Komplexität prognoserelevanter Probleme des geriatrischen Patienten mit CHI zuverlässiger zu erkennen und in Therapieentscheidungen einzubeziehen.
Comparison of EUS-guided conventional smear and liquid-based cytology in pancreatic lesions: A systematic review and meta-analysis
Authors: Chandan Saurabh , Mohan Babu P. , Khan Shahab R. , Ofosu Andrew , Dhaliwal Amaninder S. , Shah Aun R. , Bhogal Neil , Mashiana Harmeet S. , Mashiana Simran S. , Kassab Lena L. , Ponnada Suresh , Facciorusso Antonio , Bhat Ishfaq , Singh Shailender , Witt Benjamin L. , Adler Douglas G.
Published: October 2020

Background and study aims Endoscopic ultrasound (EUS)-guided fine-needle aspiration (EUS-FNA) has limitations of inadequate sampling and false-negative results for malignancy. It has been performed using conventional smear (CS) cytology with rapid on-site evaluation (ROSE) with reasonable diagnostic accuracy. An alternative to ROSE is liquid-based cytology (LBC). Commonly used LBC techniques include precipitation-based (SurePath™) and filtration-based (ThinPrep®, CellPrep®). Data regarding the diagnostic efficacy of LBC compared with CS are limited.

Methods Multiple databases were searched through March 2020 to identify studies reporting diagnostic yield of EUS-guided CS and LBC in pancreatic lesions. Pooled diagnostic odds and rates of performance for the cytologic diagnoses of benign, suspicious, and malignant lesions were calculated. Diagnostic efficacy was evaluated by pooled rates of accuracy, sensitivity, specificity, positive predictive value (PPV) and negative predictive value (NPV).

Results Nine studies with a total of 1308 patients were included in our final analysis. Pooled diagnostic odds of CS cytology were 1.69 (CI 1.02–2.79) and 0.39 (CI 0.19–0.8) for malignant lesions when compared to filtration-based and precipitation-based LBC techniques, respectively. For CS, precipitation-based and filtration-based LBC, pooled diagnostic accuracy was 79.7 %, 85.2 %, 77.3 %, sensitivity was 79.2 %, 83.6 %, 68.3 %, and specificity was 99.4 %, 99.5 %, 99.5 %, respectively.

Conclusions The precipitation-based LBC technique (SurePath™) had superior diagnostic odds for malignant pancreatic lesions compared with CS cytology in the absence of ROSE. It showed superior accuracy and sensitivity, but comparable specificity and PPV. Diagnostic odds of CS cytology in the absence of ROSE were superior to the filtration-based LBC technique (ThinPrep®, Cellprep®) for diagnosing malignant pancreatic lesions.
Monoklonale Gammopathie unklarer Signifikanz bei rheumatologischen Erkrankungen
Authors: Schmalzing Marc , Knop Stefan
Published: October 2020

In der rheumatologischen Praxis wird eine monoklonale Gammopathie (MGUS) häufig als Zufallsbefund entdeckt. Meist handelt es sich um einen Laborbefund ohne Krankheitswert, diese Fälle werden als monoklonale Gammopathien unklarer Signifikanz (MGUS) bezeichnet. Für mehrere rheumatisch-entzündliche Systemerkrankungen ist ein erhöhtes Risiko für MGUS bekannt. Aus einer MGUS kann sich ein multiples Myelom, eine primär systemische Amyloidose oder eine andere lymphatische Neoplasie entwickeln. Die relevanten Krankheitsdefinitionen werden genannt und es werden Algorithmen aufgezeigt, um eine monoklonale Gammopathie weiter abzuklären und abhängig vom Progressionsrisiko Verlaufskontrollen vorzunehmen. Die Erkenntnisse darüber, ob rheumatologische Therapien Einfluss auf das Progressionsrisiko haben, sind bislang begrenzt.