bluuebunny/crossref_metadata_2025 huggingface dataset:
Photodegradation of an ammonium ionic liquid: spiking in urban wastewater and comparison with aromatic ionic liquids
Authors: Raut Sandesh S. , Kulkarni Prashant S.
Published: July 2021

The photodegradation of an emerging pollutant, ammonium ionic liquid, is thoroughly investigated by using an advanced oxidation technique.
A comparative study on the removal of dyes from wastewater by nascent-state manganese dioxide and ferric hydroxide under acidic conditions
Authors: Tan Yujia , Cheng Zhiwen , Liu Yawei , Gao Xiaoping , Liu Shiqiang , Ren Yuanyang , Shen Zhemin
Published: July 2021

In this study, the removal of dyes by NSMD and NSFH was investigated, and two high-quality QSAR models for these adsorbents were established using multiple linear regression (MLR). Finally, the dye removal mechanisms of the two adsorbents were studied and compared.
Direct synthesis of 4-hydroxycoumarins and 4-hydroxy-6-methyl-2-pyrone containing chroman-4-ones via a silver catalyzed radical cascade cyclization reaction
Authors: Sharma Suraj , Sarma Bipul , Baishya Gakul
Published: July 2021

A novel AgNO3/K2S2O8 catalyzed radical cascade cyclization reaction of 2-(allyloxy)arylaldehydes with 4-hydroxycoumarins and 4-hydroxy-6-methyl-2-pyrone produces two new series of chroman-2-ones.
Exploring the drug loading mechanism of photoactive inorganic nanocarriers through molecular dynamics simulations
Authors: Motta Stefano , Siani Paulo , Levy Andrea , Di Valentin Cristiana
Published: July 2021

A comparative MD study unravels the loading mechanism of the doxorubicin drug to TiO2 nanoparticles functionalized with two different organic bifunctional ligands: TETT and DOPAC.
A facile fabrication of conjugated fluorescent nanoparticles and micro-scale patterned encryptionviahigh resolution inkjet printing
Authors: Wang Min , Jiang Kunkun , Gao Yifan , Liu Yaming , Zhang Zhenchao , Zhao Weiwei , Ji Hongjun , Zheng Tingting , Feng Huanhuan
Published: July 2021

We employ a typical micro-emulsion method to fabricate tunable conjugated fluorescent nanoparticles. Those nanoparticles are printed into designed QR patterns. Finally, we achieved ultra-high resolution printing with a resolution of 30 micrometers.
Silicon compounds in carbon-11 radiochemistry: present use and future perspectives
Authors: Luzi Federico , Gee Antony D. , Bongarzone Salvatore
Published: July 2021

The use of silicon-based reagents and precursors for carbon-11 labelling has shown wide applicability and robustness with short reaction times using mild conditions. In this review, recent advances and future perspectives are examined.
The effects of cononsolvents on the synthesis of responsive particles via polymerisation-induced thermal self-assembly
Authors: Morales-Moctezuma Marissa D. , Spain Sebastian G.
Published: July 2021

Responsive nanogels were synthesised via RAFT-mediated polymerisation-induced thermal self-assembly in cononsolvent mixtures of water and ethanol. The solvent mixture affected the particle size, tacticity and thermal properties.
Recent advances in integrated CO2capture and utilization: a review
Authors: Sun Shuzhuang , Sun Hongman , Williams Paul T. , Wu Chunfei
Published: July 2021

In this review, we summarize the recent progress of dual functional materials application in integrated CO2capture and utilization and discuss the superiority of the integrated process from the perspective of industrial applications.
Migration of nanoparticles across a polymer–polymer interface: theory and simulation
Authors: Gibbions Nigel , Clarke Nigel , Long Didier R.
Published: July 2021

We solve the Stokes equation for an inhomogeneous liquid in the presence of a solid interface. Our solution realistically models the wetting and dewetting of a nanoparticle, and its migration from one liquid phase to another, under shear.
Stable bismuth phosphosulfide nanoparticle encapsulation into hollow multi-channel carbon nanofibers toward high performance sodium storage
Authors: Li Linlin , Jiang Hongcheng , Xu Na , Lian Xintong , Huang Hongjiao , Geng Hongbo , Peng Shengjie
Published: July 2021

Both the unique hollow multi-channel structure and inherent merits of nanosized BiPS4 provide the as-formed BiPS4@MCNF nanoarchitecture with outstanding cycling stability and outstanding rate performance.
Prediction of two-dimensional ferroelectric metal Mxenes
Authors: Wijethunge Dimuthu , Zhang Lei , Du Aijun
Published: July 2021

Novel ground state structure which exhibits ferroelectric metal characteristics. It becomes the ground state structure for 2D mxenes such as Nb2NF2.
Neural network compensation method for improving detection accuracy of rotor position from magnetic encoder
Authors: Yin Zhipeng , Xu Jiaqun
Published: July 2021

With the advantages of low cost, small size and high resolution, the magnetic encoder is suitable for permanent magnet synchronous motor. However, due to the installation accuracy and the motor vibration, the rotor position error from magnetic encoder can seriously impact the performance of the motor. Therefore, it is necessary to reduce the detection error of the rotor position from the encoder. In this letter, a new rotor position detection method is proposed based on neural network. The characteristic of the position error from magnetic encoder is analysed, and the backpropagation neural network is presented to obtain the error compensation function. On the basis of the compensation function, the rotor position error can be corrected and thus the precise rotor position can be detected. The experimental results show that not only the rotor position error but also the related total harmonic distortion of the phase current and the torque ripple can be reduced effectively.
Overview of grounding schemes for solid‐state transformers in distribution networks
Authors: Zang Jiajie , Wang Jiacheng , Zhang Jianwen , Zhou Jianqiao
Published: July 2021

Proposed to be the critical enabling component for future distribution networks, solid‐state transformers (SSTs) have drawn much attention lately. They have a massive potential to help reduce size and weight, improve efficiency, integrate microgrids, renewables and energy storages in distribution systems, and can fulfil multiple grid functions such as bidirectional power flow control, fault isolation, system reconfiguration, and post‐fault restoration. The introduction of these power electronics devices in distribution systems, however, also brings new challenges to the grid. Extra levels of electromagnetic interference, stray current, and personnel safety are among the most prominent practical issues that proper grounding arrangements can address. In this paper, considerations that should be factored into the grounding scheme design for SST ports with different voltage forms and levels are thoroughly reviewed and summarised. The characteristics of various grounding schemes used in AC and DC distribution systems are evaluated and compared in detail from different perspectives. Based on the comprehensive review, several combinations of grounding schemes are recommended for typical SSTs. In addition, the inclusion of new relay protection devices in the SST grounding scheme design, considering their characteristics and unique requirements, to enhance protection and reliability is also discussed.
Analysing public acceptance of autonomous buses based on an extended TAM model
Authors: Wu Zhongyi , Zhou Hongmei , Xi Haijiao , Wu Nan
Published: July 2021

Integrating advantages of automated driving and mass transport, autonomous buses have broad development prospects. The research on the public acceptance of autonomous buses will help to provide a basis for formulating policies and measures, and thus have important theoretical and practical significance. In this paper, an initial theoretical model of acceptance of autonomous buses was established. An on‐line survey was conducted with a total of 401 valid samples collected. The reliability and validity tests of the data showed that the internal consistency of the questionnaire was high, and the reliability and validity all met the requirements. Based on the results of structural equation modelling, the proposed model was validated and all the hypotheses were confirmed. Attitude would positively affect behavioural intention, and trust and perceived usefulness would positively affect attitudes. Moreover, both perceived ease of use and perceived comfort would have positive effects on perceived usefulness as well as on trust. Perceived risk would be negatively associated with trust. Multi‐group analyses were conducted to test the moderating effects of the individual's education and knowledge of autonomous buses, and the two factors showed significant effects. Based on the results, corresponding measures can be taken to increase the acceptance of autonomous buses.
Integral transforms and the regularisation method in the time‐domain excitation of open PEC slotted cone scatterers
Authors: Doroshenko Volodymyr O. , Stognii Nadiia P.
Published: July 2021

An initial‐boundary value problem for the transient electromagnetic field in the presence of a complicated‐shape scatterer is studied. The considered biconical zero‐thickness and perfectly conducting surface with periodic longitudinal slots has many special cases, each of which is of separate practical interest. A new analytical‐numerical technique is presented that is based on the Mehler–Fock integral transform and the method of analytical regularisation. The source of excitation of the slotted bicone is a radial electric dipole with an arbitrary time dependence on the field. The proposed method makes it possible to obtain an analytical and numerical solution of the problem to carry out a qualitative and numerical analysis, and to study the characteristic features of the main scattering. Due to the use of the method, the initial‐boundary value problem is reduced to a Fredholm type of the second kind system of linear algebraic equations (SLAE‐2). The dependences of the condition number on the problem parameters and the estimation of the SLAE‐2 convergence with larger truncation orders are given. The far‐field radiation patterns are plotted for various values of the problem parameters, the behaviour of the near field at the apex of the slotted cone is studied, and the regime of the slot wave propagation is analysed.
Coupling impedance of a PEC angular strip in a vacuum pipe
Authors: Assante Dario , Panariello Gaetano , Schettino Fulvio , Verolino Luigi
Published: July 2021

This study deals with the evaluation of the longitudinal and transverse coupling impedance of a charge travelling in a drift tube with a perfectly electric conductive angular strip. The problem is formulated in the particle frame as dual series equations, and efficiently solved through the representation of the unknown in terms of Neumann series. Then, the electric parameters are obtained in the pipe frame through the Lorentz transforms. The presented solution can be adopted as the general methodology in case of angular discontinuities in particle accelerators.
Hierarchical control and emulation of a wave energy hyperbaric converter
Authors: Machado Isaac R. , Garcia‐Rosa Paula B. , Watanabe Edson H.
Published: July 2021

Wave energy emulators provide an option to extend studies of wave energy converters (WECs) in an electric power laboratory facility and to evaluate the performance of controllers in an experimental set‐up. In addition, the integration of control strategies in different steps of the energy conversion process is an important step to improve the WEC overall behaviour that has not yet been widely discussed. This paper proposes a real‐time emulator and a hierarchical control scheme for a hyperbaric WEC consisting of floating bodies, hydropneumatic storage system (HSS), hydraulic turbine, and doubly fed induction generator (DFIG). The proposed emulator is based on a typical electric power laboratory facility, where a numerical model reproduces the dynamics of the wet subsystem and a hardware is the WEC electrical subsystem. Thereby, a squirrel‐cage induction motor (SCIM) is coupled shaft‐to‐shaft with the DFIG. The SCIM reproduces the characteristics of torque and speed that would be observed in the real system, and then, the DFIG is subjected to a primary drive with same dynamic characteristics of the real plant. The hierarchical control integrates the generator and HSS controllers considering the optimal operating pressure for local sea state conditions. Experimental results illustrate the performance of the emulator and controllers.
Parametric study and optimization of a two‐body wave energy converter
Authors: Bao Xingxian , Xiao Weijie , Li Shubo , Iglesias Gregorio
Published: July 2021

The parametric study and optimization of a two‐body wave energy converter (WEC) for the wave and current conditions in the region of Zhaitang Island (China) is presented. Nine parameters are considered, and their influence on the power captured by the two‐body WEC is investigated following both single‐parameter and multi‐parameter approaches. A backpropagation neural network model is developed and applied to predict the captured power for any given values of the nine parameters and the wave frequency. Then the robust design method, also known as the Taguchi method, is implemented to study the comprehensive effects of the parameters on the power output of the device. Moreover, scale model experiments are conducted to verify and confirm the influence of the principal parameters on the power output. Combining numerical simulations, a neural network model and experimental work, this study provides an optimization programme for the main parameters of the device in the target sea region and, at a more general level, references for two‐body WEC designs based on specific sea states.
Detecting the intrinsic X-ray emission from the O-type donor star and the residual accretion in a supergiant fast X-ray transient in its faintest state
Authors: Sidoli L. , Postnov K. , Oskinova L. , Esposito P. , De Luca A. , Marelli M. , Salvaterra R.
Published: July 2021

We report on the results of an XMM–Newton observation of the supergiant fast X-ray transient (SFXT) IGR J08408-4503 performed in June 2020. The source is composed of a compact object (likely a neutron star) orbiting around an O8.5Ib-II(f)p star, LM Vel. The X-ray light curve shows a very low level of emission, punctuated by a single, faint flare. We analysed spectra measured during the flare and during quiescence. The quiescent state shows a continuum spectrum that is well deconvolved to three spectral models: two components are from a collisionally ionized plasma (with temperatures of kT1 = 0.24 keV and kT2 = 0.76 keV), together with a power-law model (photon index, Γ, of ∼2.55), dominating above ∼2 keV. The X-ray flux emitted at this lowest level is 3.2 × 10−13 erg cm−2 s−1 (0.5–10 keV, corrected for the interstellar absorption), implying an X-ray luminosity of 1.85 × 1032 erg s−1 (at 2.2 kpc). The two-temperature collisionally ionized plasma is intrinsic to the stellar wind of the donor star, while the power-law can be interpreted as emission due to residual, low-level accretion onto the compact object. The X-ray luminosity contributed by the power-law component only, in the lowest state, is (4.8 ± 1.4)×1031 erg s−1, which is the lowest quiescent luminosity detected from the compact object in an SFXT. Thanks to this very faint X-ray state caught by XMM–Newton, X-ray emission from the wind of the donor star LM Vel could be well-established and studied in detail for the first time, along with a very low level of accretion onto the compact object. The residual accretion rate onto the compact object in IGR J08408-4503 can be interpreted as the Bohm diffusion of (possibly magnetized) plasma entering the neutron star magnetosphere at low Bondi capture rates from the supergiant donor wind at the quasi-spherical, radiation-driven settling accretion stage.
Lp-Variational solutions of multivalued backward stochastic differential equations
Authors: Maticiuc Lucian , Răşcanu Aurel
Published: July 2021

We prove the existence and uniqueness of the Lp-variational solution, with p > 1, of the following multivalued backward stochastic differential equation with p-integrable data:

{−dYt + ∂yΨ(t,Yt)dQt∋H(t,Yt,Zt)dQt−ZtdBt,0≤t<τ, Yτ = η,

where τ is a stopping time, Q is a progressively measurable increasing continuous stochastic process and ∂yΨ is the subdifferential of the convex lower semicontinuous function y↦Ψ(t, y). In the framework of [14] (the case p ≥ 2), the strong solution found it there is the unique variational solution, via the uniqueness property proved in the present article.
Numerical modelling of hydrogen release and dispersion
Authors: Pasculescu Vlad Mihai , Suvar Marius Cornel , Tuhut Ligia Ioana , Munteanu Laurentiu
Published: July 2021

Hydrogen is the most abundant element on earth, being a low polluting and high efficiency fuel that can be used for various applications, such as power generation, heating or transportation. As a reaction to climate change, authorities are working for determining the most promising applications for hydrogen, one of the best examples of crossborder initiative being the IPCEI (Important Project of Common European Interest) on Hydrogen, under development at EU level. Given the large interest for future uses of hydrogen, special safety measures have to be implemented for avoiding potential accidents. If hydrogen is stored and used under pressure, accidental leaks from pressure vessels may result in fires or explosions. Worldwide, researchers are investigating possible accidents generated by hydrogen leaks. Special attention is granted to the atmospheric dispersion after the release, so that to avoid fires or explosions. The use of consequence modelling software within safety and risk studies has shown its’ utility worldwide. In this paper, there are modelled the consequences of the accidental release and atmospheric dispersion of hydrogen from a pressure tank, using state-of-the-art QRA software. The simulation methodology used in this paper uses the “leak” model for carrying out discharge calculations. This model calculates the release rate and state of the gas after its expansion to atmospheric pressure. Accidental release of hydrogen is modelled by taking into account the process and meteorological conditions and the properties of the release point. Simulation results can be used further for land use planning, or may be used for establishing proper protection measures for surrounding facilities. In this work, we analysed two possible accident scenarios which may occur at an imaginary hydrogen refuelling station, accidents caused by the leaks of the pressure vessel, with diameters of 10 and 20 mm, for a pressure tank filled with hydrogen at 35 MPa / 70 MPa. Process Hazard Analysis Software Tool 8.4 has been used for assessing the effects of the scenarios and for evaluating the hazardous extent around the analysed installation. Accident simulation results have shown that the leak size has an important effect on the flammable/explosive ranges. Also, the jet fire’s influence distance is strongly influenced by the pressure and actual size of the accidental release.
Assessment tools analysis of work-related musculoskeletal disorders: strengths and limitations
Authors: Popescu – Stelea Mihai , Moraru Roland Iosif , Băbuţ Gabriel Bujor , Zamfir Farkas Loriana
Published: July 2021

Musculoskeletal disorders are one of the most common occupational diseases, affecting millions of workers in the European Union and costing employers billions of euros. Researching the relationships and possibilities of optimal mutual adaptation, under given conditions, both of human to his work and of work to humans, in order to increase the technical-economic efficiency, to optimize the conditions of satisfaction, motivation and work results, while maintaining the worker’s state of health also involves, as a basic stage, the assessment of the risks of osteomuscular-articular overload. Starting from a statistical synthesis on the incidence of MSD and the characteristic types of demands, the paper systematizes in a unitary vision the categories of methods, techniques and tools available for recording and evaluating the factors of physical and postural stress of workers. The pointed description of three of the most commonly applied ergonomic risk assessment tools, aimed at developing a synthesis of Strengths-Weaknesses type, which highlights the advantages of methods in counterbalance with their limitations, providing a first basis for selection in order to apply them in the practice of companies that are aware that investing in safety means investing in profit and not losing financial resources and implicitly human, material ones.
Quality assurance of test results for the determination of Ingress Protection Code for Ex equipment enclosures
Authors: Gabor Dan , Vătavu Niculina , Popa Mihai Cătălin , Păun Florin , Jurca Adrian Marius
Published: July 2021

INSEMEX-OEC is a Conformity Assessment Body for certification activities in accordance with ATEX Directive 2014/34/EU, being accredited by RENAR and notified to Brussels (NB1809). INSEMEXGLI (Group of Testing Laboratories) is the main provider of laboratory testing services for the product certification body INSEMEX-OEC. The test laboratories meet the requirements of the standard SR EN ISO / IEC 17025. This standard requires laboratories to have a procedure in place to monitor the validity of the test results. This monitoring must be planned and, if possible, should include participation in inter-laboratory comparisons or proficiency testing programs. This paper presents some specific issues highlighted during the successful participation of INSEMEX-GLI in a round of inter-laboratory comparisons organized by the Physikalisch-Technische Bundesanstalt from Germany to determine International Protection Code (IP Code) for equipment enclosures.
Workplace risk management in the context of the covid-19 pandemic
Authors: Băbuţ Andrada Denisa , Morar Marius Simion , Cioară Cristian Raul , Tomescu Cristian
Published: July 2021

In March 2020, a pandemic was declared internationally, caused by a new coronavirus called COVID-19. With the advent of the COVID-19 virus and the declaration of the pandemic, safety and distancing measures have been instituted, which we cannot say we are used to and which we easily accept, but which are necessary to combat the spread of the virus. We also cannot deny that this pandemic has affected and continues to affect our mental health, triggering a certain state of anxiety and with it the lowering of our immune system, which makes us more vulnerable to disease. Paradoxically, mental health is one of the first things that helps us to resist and survive the crisis, which is why it is important to provide employees with protection to ensure the necessary mental comfort at work.

In this context, this paper synthesizes the basic principles and best practices of psychosocial risk assessment, highlighting how hazard identification and risk management strategies should be based on the involvement of all stakeholders in combating anxiety at workplace.
Analysis of the field of specific knowledge of occupational risks related to handling toxic substances
Authors: Darabont Doru , Trifu Alina , Badea Daniel , Ţărnău Bogdan
Published: July 2021

This paper presents the findings of an ongoing project developed in collaborations with SC Medinet HC Services SRL that addresses the occupational safety issues related to handling toxic substances, with emphasis on risk identification. INCDPM carried out an extensive literature review of existing published relevant materials, textbooks, journals, conference papers, and internet that were processed with PRISMA method (Preferred Reporting Items for Systematic Reviews and Meta-Analyses) and together with SC Medinet partner that provided an operational study and onsite risk identification, developed an extensive and comprehensive list of occupational risks related to handling toxic substances.
Analysis of the possibilities of geometry of the Rosia Poieni mining field
Authors: Gusat Dorel , Bud Ioan , Goia Mircea
Published: July 2021

This paper is made within the European project GoldenEye Nr. 869398 Type Horizon 2020 and aims at geometrization in 3D format of the Rosia Poieni deposit. This geometrization will be based on the information on the contents of the deposit, the economic analysis, and the calculations of the stability of the open pit and the adjacent industrial waste dumps. The analysis of data from the literature on content is in a very wide and insufficiently relevant range. The study will be based on the latest scanning technologies, AI, numerical simulations (FLAC 2D), which will form the basis of an economic analysis and forecast of metal prices in the future in order to identify exploitable limits both horizontally and vertically. Depending on the extension of the exploitation area and the definition of the deep exploitation limit by up-to-date exploitation, stability calculations will be performed, which will finally allow the geometry and safety of the deposit. Also, this geometrization will allow the decision-making of exploitation, extension, optimization by the management team and the administrative council of CUPRUMIN ABRUD S.A.
Evaluation of surface mining areas through geospatial analysis. The case of Ptolemais lignite mines
Authors: Servou Aikaterini , Paraskevis Nikolaos , Roumpos Christos , Pavloudakis Francis
Published: July 2021

The lignite surface mines often occupy large areas to develop the mining activities: pits, dumping areas, bunkers, buildings, workshops, and other auxiliary facilities. The land reclamation methods and the corresponding land use alternatives after the mine closure constitute an important part of an integrated mining planning. In the present contribution, the main parameters of geospatial planning are investigated in order to assess the changes in land uses in a mining area and to correlate them with the spatiotemporal development of the extraction works. As a case study, geospatial analysis of the current situation in Ptolemais mines is presented. In particular, seven dumping areas are assessed regarding their suitability for specific land uses. The assessment is based on the following criteria: a) slope gradient, b) reclamation works already completed, c) slope aspect, d) proximity to the road network, and e) proximity to residential areas. Furthermore, the ArcGis software is used to compile the layer maps of the corresponding parameters.
Analysis of the risks generated by the tailings ponds near the city of Borşa
Authors: Bud Adina
Published: July 2021

The paper presents the risks regarding the physical and chemical stability of the tailings ponds grouped under the name of Ds (D1, D2, D3, D4) located on the right bank of the river Cisla near the residential area of Baia Borşa and Colbu tailings pond upstream of the residential area of Borşa. The closure of these tailings ponds was done in a defective manner, without complying with the design and execution rules provided in the Technical Regulation on waste storage. The are two types of risks: first type, due to chemical instability that produces continuous acid drainage and the second type, regarding physical instability, due to erosion and extreme weather conditions which could lead to failure of the dams, with very serious consequences, causing material damages and loss of life. The risk of breaking the dams is even higher as it is located in the vicinity or upstream of residential areas located in a geographical structure of valley type containing the river Cisla with high debit.
Summary of requirements for the use of cells and batteries in potentially explosive atmospheres
Authors: Andriş Adriana , Darie Marius , Grecea Dănuţ , Burian Sorin , Csaszar Tiberiu
Published: July 2021

The use of wireless equipment in the industrial field is a modern trend both in terms of communication equipment, monitoring of gas concentration, environment or installations but also for remote controls and power backup. The energy source for such equipment are cells and batteries. The first part of the article addresses the risk of explosion and the peculiarities of flammable atmospheres. The second part was dedicated to the presentation of the types of cells suitable for use in explosive atmospheres. The last part presents a summary of the specific requirements of cells and batteries regarding the explosion protection.
Comparative analysis of performance indicators for photovoltaic panels and cogeneration generators
Authors: Roibu Dragoş Çtefan , Irimie Sabin Ioan , Petrilean Dan Codruţ
Published: July 2021

The energy perspective of the near future relies on the use of natural gas and renewable energy resources and for the distant future hydrogen energy is shaping up. In order to provide the correct information necessary for a high-performance option in the case of the availability of photovoltaic panels or cogeneration generators, this paper addresses energy performance and environmental impact in the case of the two systems based on different primary energy resources. The comparison method is based on the calculation of energy balance elements and the results obtained are used to calculate quantitative and qualitative performance indicators. Based on the obtained indicators, the level of response to the requirements of a sustainable energy is verified, for the analyzed variants.
The necessity of storage technology development for unpredictable energy sources
Authors: Stochitoiu Maria Daniela , Utu Ilie , Pana Leon
Published: July 2021

The renewable energy is more and more used and represents a higher and higher percentage in the world’s total energy production. The reliability of the renewable sources proves to be less predictable than the conventional ones. The need of new energy storage systems becomes imperative, and when used altogether with renewable sources, they improve the predictability of those sources, thus making possible their use in the energy system market.
Numeric simulation of the pulsation bottle for a reciprocating compressor in dynamic regime
Authors: Pana Ion , Dinu Florinel
Published: July 2021

The pulsation bottles are mounted at the inlet and outlet of / from the reciprocating compressor cylinders to even out the gas parameters (pressure and temperature). They ensure stable working conditions in the compressor cylinders and eliminate / reduce vibrations. The sizing of the pulsation bottle is done based on the geometric parameters of the compressor, the volume efficiency and working pressure. The use of a dynamic model made in the LMS Amesim program allows the study of a compressor with a set of pulsation bottles at the modification of: the pressure and temperature at the inlet / outlet of the compressor, the speed of the compressor the volume of the dead space and blocking or removing of the valves. The model includes the compressor cylinder with the corresponding dead spaces, the compressor valves, the suction and discharge pipelines and crank connecting rod mechanism. The simulation takes into account of the: gas composition, temperature and pressure in the system. The variation of the pressure in the bottles can be checked under these conditions. The values of the disturbing forces for a range of working and adjustment parameters can be obtained, values that can be used in a dynamic analysis according to API 618.
New tendencies in public administration: from the new public management (NPM) and new governance (NG) to e-government
Authors: Ţicu Dorina
Published: July 2021

This article aims to realize an analysis on the current public administration through the prism of new explanatory theories: The New Governance (NG) and the New Public Management (NPM), beyond the classical bureaucratic theories, the sociological theories, etc. The article is based on a qualitative analysis of the local public administrative system: trying to identify whether the elements of e-government are present at this level, as well as what their role and their necessity are at the publicadministrative level by correspondence with the new theories applied, presented above: NG and NPM.
The impact of covid-19 on global insurance market
Authors: Preda Ana , Popescu Mirela , Drigă Imola
Published: July 2021

The purpose of the paper is to present the changes occurred on global insurance markets during the current pandemic situation. The effects are largely felt through asset risks, weaker premium growth prospects, and also insurers’ long-term investment. Developed markets, particularly life ones, are likely to shrink in real terms as a result of the economic slowdown. Higher mortality rates due to the coronavirus pandemic are affecting the bottom lines of many life insurers. The main trends in this sector in last years, is based on the most important aspects such as, written premiums, and benefits paid, types of the life insurance contracts and density and penetration degree of the life insurance sector.
A managerial perspective over one year of online education in Romania. A case study at the University of Petroşani
Authors: Edelhauser Eduard , Lupu-Dima Lucian , Grigoraş Georgiana
Published: July 2021

The authors tried to analyse the implication of one year of online education in one of the smallest Romanian university. The analysis was seen as a challenge for the management of a university who was not prepare for e-learning or online education at the beginning of the pandemic crisis. They have made a double investigation, one from the professor perspective and another from the students one. They had investigated the main feature of a standard online or a classical eLearning solution, such as the meeting solution or the videoconference software, the collaborative work such as homework or projects and the testing method or the quizzes from both perspectives. Because the university didn’t adopt a unique solution they had made a comparison between the used solutions, and more important they identified the efficiency of the university management in implementing the online education in the pandemic crisis period.
Knowledge management systems in Quality 4.0
Authors: Dovleac Raluca
Published: July 2021

Quality management has evolved throughout time in ways that allowed companies to adapt quality practices and principles into their activities in order to provide better products/services to their customer. The latest trends point to the pivotal role that quality plays in the Industry 4.0 era, where it is expected to synergize with Industry 4.0 practices in order to ensure that not only products are built faster and cheaper but also that they can meet the quality expectations of the customers. This gave birth to the concept of Quality 4.0, a new way of managing quality which uses modern technologies such as: IoT, Blockchain, Big data, AI and sensors in order to gather relevant information, monitor process performance and act preemptively in regard to the quality of the process output. An issue that emerges however, is identifying the relevant data and ways to manage it as this is considered to be a major obstacle in the implementation of Quality 4.0 practices. The research focuses on providing the foundational base for Knowledge management practices of companies looking to embrace Quality 4.0 to ensure that these companies use relevant data in their daily activities.
Business model based on community for a sustainable tourism development
Authors: Samuil Ionela , Ionică Andreea Cristina
Published: July 2021

Improper management practices in tourism can have an undesirable impact on the environment and society and can threaten both the development of tourism and the economic viability of communities. Awareness of this challenge has led to widespread acceptance of the concept of sustainable development. The purpose of this paper is to highlight that sustainable development is achieved with the support and participation of all parties involved in tourism. As tourism is promoted as a tool for community conservation and development, the emphasis must be on local communities and their needs and capacities. If well designed, community-based tourism can become a mechanism for reducing poverty and improving the quality of life, providing economic benefits to people in local communities. The objective of this research is to highlight the importance of collaboration actions between authorities, stakeholders and the community for the development of the Petrila Theme Park. Also, based on social and technicaleconomic studies, a business model will be proposed to allow the visualization of the potential impacts generated by the development of tourism.
Could be efficient management a solution for the success against Covid-19
Authors: Rotaru Nicu-Pantelimon , Taşcă Nicolae , Edelhauser Eduard
Published: July 2021

Globally, the last 15 months have put health systems under unprecedented pressure during the last century, facing significant challenges in the management of organizations, patient care and the protection of medical staff, and the time to respond to the needs of communities. The context created by the SARS-CoV-2 pandemic shows us how important the functionality of a health system is, how manages could prevent the spread of the virus, how the number of tests or vaccinations could stop the spread of the virus. It is also important to provide access to health services for as many patients as possible, especially for those in vulnerable categories, but also to succeed in ensuring maximum safety conditions for specialized personnel (doctors, nurses, paramedics, ambulance drivers, pharmacists etc.). The authors considered that the essential features of each health system, in the analysis of how they responded to the challenges of the SARSCoV-2 (or COVID-19) pandemic, must be analyzed from the perspective of the medical act, its financing, and also from the use of modern technologies and resilience. Synthesis was made between the results of the 4 official studies presented by the Commonwealth Fund, Health Consumer Powerhouse, Bloomberg and U.S. This information, put by the authors in a comparative analysis with the updated data of the World Health Organization, constantly highlighted several health systems that had an effective management in the fight against the Covid-19 pandemic.
A challenge for the Romanian management companies - The communication specialist
Authors: Taşcă Nicolae , Rotaru Nicu-Pantelimon , Lupu-Dima Lucian
Published: July 2021

In this paper, the authors’ goal was to analyze the importance of managerial communication in Hunedoara county companies. The authors carry out a research using the survey method through a short questionnaire, ensuring that it does not take more than 5 minutes for the respondents to complete. The questionnaire was composed of 14 questions, was distributed online and applied to a group of over 500 companies from Hunedoara County, between 13th September 2020 and 30th September 2020. The authors received 34 answers, and these answers consist the basis of the research. The authors were interested in whether there are managerial communication procedures at the company level, and also, they have focused on the characteristics of managerial communication in these companies. They analyzed if in these companies it is used a task-centered or a human-centered communication, whether the communication used is formal or informal, or what method of communication is mainly used - bottom-up or top-down. Even if the present research was limited to the borders of Hunedoara county, the authors demonstrate the necessity of the existence of communication specialists especially in the area of organization management.
Psychosocial implications of marital rape
Authors: Filip Oana Lavinia , Popp Lavinia Elisabeta
Published: July 2021

The paper deals with spousal rape, an act of violence with a high degree of social danger and the elements by which the perception of marital rape is determined by the social and cultural context, by the religious affiliation, by local traditions as well as by society’s mentality. The aim of the approach was to highlight the correlation between spousal rape and patterns of conduct induced by this phenomenon on the family level, resulting in consequences that affect the sexual freedom of the person, and restrict a person’s right to protection of psychic and mental health. The techniques used in the research applied were the counselling and semi-structured interview, applied between September and December 2020, to a number of 13 women who experienced incidents of rape by their partner. Thus, we can consider that this particularly serious phenomenon induces major damage to the personality of the victim, who may suffer from depressive disorder, sex life troubles, sleep deprivation, addictive disorders and eating disorder.
Comparative approach to ICT practices in civilian and military environments for organizational management during the pandemic crisis
Authors: Ranf Diana Elena , Gorski Hortensia , Badea Dorel , Virca Ioan
Published: July 2021

It is well known that change affects people and implicitly the organizations they belong to, as a place of manifestation and storage of their capabilities. Consequently, the changes also give rise to concerns for at least an acceptable solution to the management of the main changes that occurred in the situation prior to the occurrence of the disruptive events. In this context, the onset of the pandemic crisis puts organizations in front of a fragile reality (relative to the stability of the normal state of functionality of society), fully characterized by volatility, insecurity, complexity and ambiguity. In the search for ideas to improve resilience, there are no predetermined solutions, any method that has registered results in a certain organizational field becoming a candidate of good practice. In this framework, it is proposed the comparative investigation (civilian-military) of ICT practices, as a macro agent of change, used in the field of organizational management during the current pandemic crisis. The approach is based, for each of the two mentioned organizational categories, both on theoretical aspects with hypothetical value identified or derived from the specialized literature specific or complementary to the field in question, and on identified practices. We considered this approach useful because there are enough arguments that the military organization has been a model of organizational-managerial development, which finds wide applicability for business continuity management situations, applicable to civilian organizations. Final expectations are directed, based on data existing so far, towards the identification of flexible and adaptable solutions, with the value of good practice.
Bi-level pricing and inventory strategies for perishable products in a competitive supply chain
Authors: Rajabi Naser , Mozafari Marzieh , Naimi-Sadigh Ali
Published: July 2021

This paper aims to develop a new bi-level game model for joint pricing and inventory decisions in a competitive supply chain consisting of a dominant manufacturer, who produces single perishable product from deteriorating raw materials, and two follower retailers who face nonlinear price-dependent demand and operate under Cournot assumptions. Three levels of warehousing including raw material warehouse, final product warehouse, and retail warehouses with exponential deterioration rates are considered to explore the joint impact of deterioration rate and price elasticity on the equilibrium inventory decisions. A Stackelberg–Nash–Cournot model is developed to seek the equilibrium prices, quantities, and replenishment cycles and is solved through an exact methodology. A numerical example is presented to validate the proposed model and comprehensive sensitivity analyses are carried out to measure the impact of the model’s key parameters including the deterioration rate in the producer’s and the retailers’ warehouses, the retail and competitor price elasticity, and the market scale on the equilibrium.
Computational investigations on port injected DEE in a biogas inducted HCCI engine
Authors: Jairam Karthick , Mohammed Musthafa Feroskhan , Annanth Vijayan Kishorre , Renganathan Manimaran
Published: July 2021

Owing to global climate change and atmospheric pollution, several automobile manufacturing companies look for homogeneously charged engines to satisfy strict emission levels. In the present work, computational fluid dynamics (CFD) investigations have been carried out to showcase the homogeneity of air-fuel mixture formation by port fuel injection and manifold fuel injection of a Biogas-Diethyl Ether (DEE) homogeneous charge compression engine (HCCI). The distributions of equivalence ratio based on fuel and the total air-fuel mixture is formulated and found to be in close agreement with the literature. Earlier investigations have shown that the use of biogas as a single fuel causes lower power output compared to other alternative fuels. Hence the present study is planned to use biogas with DEE as an ignition improver via fuel injection systems to find the best suitable fuel injection system. In the mesh independent study, port injection mode is found to perform better against the manifold injection mode when compared with the homogeneity factor. Iso-volumes of excess-air ratio based on biogas, diethyl ether and other variables such as the density, turbulent kinetic energy, turbulent dissipation rate of air-fuel mixture influencing the homogeneity and equivalence ratio are studied for better in-cylinder distribution under the port injection mode.
Cancer-Associated Atherothrombosis: The Challenge
Authors: Naschitz Jochanan E.
Published: July 2021

The association between venous thrombosis and malignancy, having typical features of a paraneoplastic syndrome, has been established for a century. Currently, it is recognized that arterial thromboembolism (ATE) may also behave as a paraneoplastic syndrome. Recent matched cohort studies, systematic reviews, and observational studies concur in showing an increased incidence of acute coronary events, ischemic stroke, accelerated peripheral arterial disease, and in-stent thrombosis during the 6-month period before cancer diagnosis, peaking for 30 days immediately before cancer diagnosis. Cancer patients with ATE are at higher risk of in-hospital and long-term mortality as compared with noncancer patients. In the present review, we focus on the epidemiology, clinical variants and presentation, morbidity, mortality, primary and secondary prevention, and treatment of cancer-associated ATE. The awareness that cancer can be a risk factor for ATE and that cancer therapy can initiate cardiovascular complications make it mandatory to identify high-risk patients, modify preexistent cardiovascular risk factors, and adopt effective antithrombotic prophylaxis. For ATE prophylaxis, modifiable patient-related risk factors and oncology treatment–related factors are levers for intervention. Statins and platelet antiaggregants have been studied, but their efficacy for prevention of cancer-associated ATE remains to be demonstrated. Results of revascularization procedures for cancer-associated ATE are worse than for ATE in noncancer patients. It is important that a multidisciplinary approach is adopted for making informed decisions, by involving the vascular surgeon, interventional radiologist, oncologist, and palliative medicine, as well as the patients and their family.
Malignant Large Bowel Obstruction
Authors: Muldoon Roberta L.
Published: July 2021

Large bowel obstruction is a serious and potentially life-threatening surgical emergency which is associated with high morbidity and mortality rate. The most common etiology is colorectal cancer which accounts for over 60% of all large bowel obstructions. Proper assessment, thoughtful decision-making and prompt treatment is necessary to decrease the high morbidity and mortality which is associated with this entity. Knowledge of the key elements regarding the presentation of a patient with a large bowel obstruction will help the surgeon in formulating an appropriate treatment plan for the patient. Comprehensive knowledge and understanding of the various treatment options available is necessary when caring for these patients. This chapter will review the presentation of patients with malignant large bowel obstruction, discuss the various diagnostic modalities available, as well as discuss treatment options and the various clinical scenarios in which they are most appropriately utilized.