67 research outputs found
Are Public Projects Different than Projects in other Sectors? Preliminary Results of Empirical Research
No full textAbstractThis paper presents the first results of original empirical research on differences between public projects and projects in other sectors. First we will define the very concept of a public project, before presenting the results of research performed in over 60 countries. The research shows a greater complexity of managing public projects than of managing projects in other sectors. Relatively, in comparison to projects of other sectors, the most complicated public projects management areas are stakeholder management, procurement management, and communications management. These management areas therefore require that special training programs be developed in public institutions. This article also contributes to the theory of public projects management by proposing the fuzzy dimensional model of differences between public projects and projects of other sectors
National Public Projects Implementation Systems: How to Improve Public Projects Delivery from the Country Level
No full textAbstractMottoI do not ask what public project may do for their governments. I ask what governments should do to assure their projects success.National Public Projects Implementation System (NPPIS) is the whole environment of public projects implementation in given country. It may be perceived as an extension of the concept of Project Management Office for the country level. It consists of six basic areas. The Public Projects Portfolio Management area is responsible for selecting, initiating and modifying the set of public projects in a given country. The Organizational Units area covers units engaged in implementing public project. It ranges from single PM agents through national level PMOs to advisory boards responsible for overseeing and improving the whole systems of public projects implementation. The Processes and Methodologies area covers processes related to project management in given country. Its main components are processes of project implementation and processes for project assurance and governance. The Knowledge Management area is responsible for providing knowledge to public projects actors (trainings, knowledge exchange etc.) and for knowledge exchange with project stakeholders (e.g. communities of citizens). Public projects are implemented by their actors: the most important of them are project managers and vendors. The approach to managing them is covered by the Actors area. The sixth area of NPPIS is the area of development of public projects implementation. It may range from establishing NPPIS in countries where there is no such system to sophisticated NPPIS improvement processes
(the Effect of Filler to the Quality of Aloe Powder)
No full textAloe vera linn is neended in industries as rwa material for cosmetics, pharmacy and beverages.The types of aloe product which are available are in the form of gel,juice and powder.Aloe powder has more advantages in many cases than the other thypes.the research was conducted to study the-effect of filler in producing aloe powder.Fillers used were arabic gum and carboxyl methyl cellulose (CMC). The concentration of arabic gum applied was 1%,2% ,3% ,4%, and 5%,while the concentration of the mixed arabic gum and CMC was 2% with the ratio of 1:1,1:2,1:3,1:4,and 1:5.The best result was found with 2% filler of mixed arabic gum and CMC with the ratio of 1:2,where pH was 5.25 and the ratio between product and the raw material was about 1:200.The viscosity of 2.50% of liqid from reconstitution of the aloe powder was 9.34 centipoise
(the Effect of Catalyst, Temperature and Process Duration on the Production of Methyl Ricinoleate From Castor Oil)
No full textMethyl ricinoleate was produced by methanolysis process from castor oil using KOH and NaOH as catalysts. The esterification process was carried out at the temperature of 30 derajat and 70 derajat celcius for 1, 2, and 3 hrs respectively. The product was analyses using GC for the esterification process. The iod value saponification value, and acid number were also analysed. Potassium hydroxide gave higher result in comparison to sodium hydroxide as catalyst for the process duration of 3 hrs. The specific gravity of the product ranged from 0.8903 to 0.9608 and the refractive index was between 1.3810 and 1.4500
Public Project Management Model
No full textZarządzanie projektami jest jednym z podstawowych narzędzi nowoczesnej administracji publicznej. Do chwili obecnej nie istnieje spójny model
zarządzania takimi projektami, zdefiniowany z punktu widzenia administracji centralnej. Artykuł zawiera wynik próby utworzenia zarysu takiego modelu. Artykuł powstał w wyniku wykonania przeglądu najlepszych praktyk zarzą-dzania projektami publicznych z 93 krajów. Praktyki te zostały pogrupowane w sześć obszarów: zarządzanie portfelem projektów publicznych, jednostki organizacyjne, procesy i metodyki zarządzania, zarządzanie wiedzą, aktorzy projektów publicznych oraz rozwój systemów zarządzania projektami publicznymi. Obszary tewspólnie tworzą zarys modelu zarządzania projektami publicznymi. W artykule wprowadzono pojęcie p-Rządu, czyli rządu, który opiera swoje działanie na skutecznym zarządzaniu projektami.Project management is one of the basic tools of modern public administration. So far, there has not been any coherent model of management
of such projects, defined from the point of view of the central administration. The article contains a result of an attempt to produce an outline of such
a model. The article is an effect of a review of best practices of public project management from 93 countries. Those practices are grouped in six areas: public project portfolio management, organisational units, management processes and methodologies, knowledge management, public project actors, and development of public project management systems. These areas jointly form an outline of the public project management model. In his article, the author introduced the notion of p-Government, i.e. the government which relies its activity on an effi cient project management
Electrochemical and biological characterization of Ti–Nb–Zr–Si alloy for orthopedic applications
Full text link| openaire: EC/H2020/860462/EU//PREMUROSA Funding Information: Financial supports of the European Commission under FP6 SME integrated project “Meddelcoat” (contract 026501-2) and from the European Union’s Horizon 2020 research and innovation program under the Marie Skłodowska-Curie ITN “Premurosa” (GA 860462) are gratefully acknowledged. Authors are greatly thankful for the late Dr. A. V. Mazur for help in TNZS alloy preparation, Dr. H. Yu for assistance in thermodynamic database optimization and Dr. D. Sukhomlinov for his help in performing the SEM/EDS. The LEMI assistance in analyzing details for the cells-materials interactions, led by Mrs. Prof. M.-F. Harmand and Mrs. D. Pierron, is also gratefully acknowledged. Publisher Copyright: © 2023, The Author(s).The performance of current biomedical titanium alloys is limited by inflammatory and severe inflammatory conditions after implantation. In this study, a novel Ti–Nb–Zr–Si (TNZS) alloy was developed and compared with commercially pure titanium, and Ti–6Al–4V alloy. Electrochemical parameters of specimens were monitored during 1 h and 12 h immersion in phosphate buffered saline (PBS) as a normal, PBS/hydrogen peroxide (H2O2) as an inflammatory, and PBS/H2O2/albumin/lactate as a severe inflammatory media. The results showed an effect of the H2O2 in inflammatory condition and the synergistic behavior of H2O2, albumin, and lactate in severe inflammatory condition towards decreasing the corrosion resistance of titanium biomaterials. Electrochemical tests revealed a superior corrosion resistance of the TNZS in all conditions due to the presence of silicide phases. The developed TNZS was tested for subsequent cell culture investigation to understand its biocompatibility nature. It exhibited favorable cell-materials interactions in vitro compared with Ti–6Al–4V. The results suggest that TNZS alloy might be a competitive biomaterial for orthopedic applications.Peer reviewe
Electrochemical behavior of additively manufactured patterned titanium alloys under simulated normal, inflammatory, and severe inflammatory conditions
Full text linkThe electrochemical behavior of a biomaterial surface in local conditions is a significant factor affecting the success of the implant placement. This is of a particular importance of metallic biomaterials which can undergo oxidation, corrosion and subsequent degradation. This study reports new data on the electrochemical behavior of additively manufactured (AM) patterned titanium alloys, analyzed after 1 and 12 h immersion in three different media mimicking normal, inflammatory and severe inflammatory conditions. Polarization study showed that corrosion resistance increases with increasing immersion time in all cases. It was found that in inflammatory condition a destructive effect on the passive layer's resistance was triggered by H2O2 whereas in severe inflammatory condition, albumin, lactate, and H2O2 all have a synergistic effect towards decreasing the corrosion resistance of patterned titanium layers. Electrochemical impedance data suggests that in the severe inflammatory condition the charged albumins are attracting to the localized pitting areas, changing diffusion transport of corrosive species at the interface of the metal/passive layer. The electrochemical tests also proven that laser-assisted patterned titanium alloys surfaces have an improved corrosion resistance in simulated solutions compared to untreated titanium of the same composition. It is suggested that new surface topography and wettability are also positive factors contributing to this improved corrosion performance in patterned specimens
Viscoelastic behaviour of hydrogel-based composites for tissue engineering under mechanical load
No full textAlong with biocompatibility, bioinductivity and appropriate biodegradation, mechanical properties are also of crucial importance for tissue engineering scaffolds. Hydrogels, such as gellan gum (GG), are usually soft materials, which may benefit from the incorporation of inorganic particles, e.g. bioactive glass, not only due to the acquired bioactivity, but also due to improved mechanical properties. They exhibit complex viscoelastic properties, which can be evaluated in various ways. In this work, to reliably evaluate the effect of the bioactive glass (BAG) addition on viscoelastic properties of the composite hydrogel, we employed and compared the three most commonly used techniques, analyzing their advantages and limitations: monotonic uniaxial unconfined compression, small amplitude oscillatory shear (SAOS) rheology and dynamic mechanical analysis (DMA). Creep and small amplitude dynamic strain-controlled tests in DMA are suggested as the best ways for the characterization of mechanical properties of hydrogel composites, whereas the SAOS rheology is more useful for studying the hydrogel's processing kinetics, as it does not induce volumetric changes even at very high strains. Overall, the results confirmed a beneficial effect of BAG (nano)particles on the elastic modulus of the GG-BAG composite hydrogel. The Young's modulus of 6.6 ± 0.8 kPa for the GG hydrogel increased by two orders of magnitude after the addition of 2 wt.% BAG particles (500-800 kPa).Peer reviewe
Mechanical stimulation devices for mechanobiology studies: a market, literature, and patents review
No full textFunding Information: This work was supported by FCT (Fundação para a Ciência e a Tecnologia) through the grant SFRH/BD/141056/2018, the project PTDC/EME-EME/1442/2020 and under the national support to R&D units grant, through the reference projects UIDB/04436/2020 and UIDP/04436/2020. In addition, this work was developed within the scope of the project CICECO-Aveiro Institute of Materials, UIDB/50011/2020, UIDP/50011/2020 & LA/P/0006/2020, financed by national funds through the FCT/MEC (PIDDAC). Open access funding provided by FCT|FCCN (b-on). Publisher Copyright: © 2023, The Author(s).Significant advancements in various research and technological fields have contributed to remarkable findings on the physiological dynamics of the human body. To more closely mimic the complex physiological environment, research has moved from two-dimensional (2D) culture systems to more sophisticated three-dimensional (3D) dynamic cultures. Unlike bioreactors or microfluidic-based culture models, cells are typically seeded on polymeric substrates or incorporated into 3D constructs which are mechanically stimulated to investigate cell response to mechanical stresses, such as tensile or compressive. This review focuses on the working principles of mechanical stimulation devices currently available on the market or custom-built by research groups or protected by patents and highlights the main features still open to improvement. These are the features which could be focused on to perform, in the future, more reliable and accurate mechanobiology studies. Graphic abstract: [Figure not available: see fulltext.].Peer reviewe
3D multi-material laser powder bed fusion: Ti6Al4V–CuNi2SiCr parts for aerospace applications
No full textFunding Information: This work was supported by FCT (Fundação para a Ciência e Tecnologia) through the grant national funds, under the national support to R&D units grant, through the reference projects UIDB/04436/2020 and UIDP/04436/2020 and SFRH/BD/148031/2019. This work was also cofinanced by FEDER, through the Competitiveness and Internationalization Operational Program (POCI), in the project Add. Additive, with the reference POCI-01-0247-FEDER-024533. Additionally, this work was supported by the project Moedinov—New aesthetics for collection coins using advanced technologies with the reference POCI-01-0247-FEDER-033361. Publisher Copyright: © 2023, The Author(s), under exclusive licence to Springer Nature Switzerland AG.A first approach to produce multi-functional Ti6Al4V–CuNi2SiCr parts using a homemade 3D multi-material laser powder bed fusion system (3D MMLPBF) was exploited in this work. Only using a layer-by-layer approach, it is possible to manufacture an 3D multi-material Ti6Al4V–CuNi2SiCr component that combines high mechanical strength (Ti6Al4V) and high thermal conductivity (CuNi2SiCr), all in a single component, fabricated at once. This paper explored a new 3D Ti6AL4V–CuNi2SiCr multi-material concept in terms of material’s interaction and the morphological and mechanical behavior of each material. The interface region of the 3D MMLPBFed specimens a good mechanical interlocking with a strong metallurgical bonding with occasional defects such as pores or cracks along the produced part. The Vickers’ microhardness of Ti6Al4V and CuNi2SiCr zones was about 356 HV and 128 HV, respectively.Peer reviewe
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