104,512 research outputs found
L'indagine critico-stratigrafica (ICS) delle superfici murali storiche
No full textMolto più che i materiali pregiati, la pittura murale rappresenta la naturale finitura dell’architettura storica italiana, sia nelle superfici interne che in quelle esterne. Non dipinti murali “storici”, letti e intesi come “quadri” isolati, ma tutto l’immane patrimonio di partiture decorative di ogni genere ha sempre costituito l’autentica immagine dell’architettura italiana. Al contrario delle comuni opinioni, nella cultura architettonica storica non esistono né affreschi isolati, né “tinteggiature”, né “filetti di colore”, ecc.; tutte queste entità, come pure le scelte materico-cromatiche correlate solo al “gusto”, sono prodotte da una sottocultura, frutto della società ormai dimentica della propria tradizione edilizia e, quindi, pittorico-decorativa. Partendo da tale premessa, la prima, ineludibile azione di conservazione del patrimonio pittorico murale, e dell’architettura storica in generale, deve essere costituita dall’indagine stratigrafica e, ove opportuno, dall’eventuale disvelamento delle finiture superficiali pregresse dell’architettura storica. Si è mossa in questa logica un’attività di studio e di sperimentazione di oltre venti anni che ha permesso la messa a punto di una metodologia tecnico-scientifica e operativa d’indagine critico-stratigrafica delle superfici architettoniche. Un sistema facilmente utilizzabile, sia perché non presenta difficoltà operative, sia perché non richiede attrezzature eccessivamente sofisticate e alti costi, e idoneo a riconoscere, classificare, documentare i trattamenti superficiali pregressi dell’architettura, ponendo le adeguate premesse per una loro conservazione ed eventuale recupero. La relazione illustra, attraverso esempi d’intervento compiuti in varie regioni italiane, dal Veneto alla Puglia, con risultati ovunque altamente significativi, l’attuale punto di arrivo di questo sistema d’indagine che partendo dallo scavo nel testo giunge al progetto specialistico d’intervento
EMPLOYEE PARTICIPATION IN MANAGEMENT DECISION MAKING IN NTC UNITS, WITH SPECIAL REFERENCE TO THE TEXTILE MILLS IN COIMBATORE
No full text<p><span>As there is more number of private textile units in Coimbatore which are going in good success, this paper is concerned with a question to know how the public units are competing and how the employees are feeling goodself in coming out of their opinion. A study has done to know the existing level of Worker Participation in Management Decision making within the NTC Production units.<span> </span>Interview schedule and in-depth interview were the main research techniques adopted for data collection while chi square and percentage used to analyze the data collected for the study. </span></p>
<p><span>Results show that employees in organizations demonstrate a high interest in participation in the decision making process within their respective work places. However, the actual level of involvement in management decision making demonstrated by the employees was found to be relatively low. </span></p>
<p><span>The study reveals a growing desire of non-management employees in the work environment to exercise greater involvement in the decision making process of the enterprise. Majority of the employees informed that decisions taken at the committee meetings are implemented, has the positive opinion about the councils working and performance, the organization has been considering the pre-requisites of successful workers participation and feels that shop council and plant council benefit the organization to great extent.</span></p>
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<p><strong><span>KEYWORDS: </span></strong><span>Employees, Involvement, Worker Participation, Decision making, Attitude.</span></p>
Performance Analysis of Process Parameters on Machining Titanium (Ti-6Al-4V) Alloy Using Abrasive Water Jet Machining Process
No full textAbstractOwing to its light weight and corrosive resistant, Titanium (Ti-6Al-4V) alloy is mainly utilized in fabricating medical device applications. Since it has high strength, it is very difficult to machine alloy using conventional machining. In the present study, an endeavor has been made to machine titanium alloy using AWJM process. Since the process involves with less heat affect zone and higher material removal, it is possible to enhance machinability of workpiece. It has attempted to find the influence of process parameters on surface roughness and topography for enhancing the process. It has been observed that the abrasive flow rate and standoff distance has the most significant role on determining surface quality
I frati e la città. Pitture murali esterne nelle chiese mendicanti veronesi
No full textIl saggio considera le pitture murali di XIV e XV secolo presenti all'esterno delle principali chiese mendicanti veronesi (Santa Anastasia, San Fermo Maggiore, Santa Eufemia, Santa Maria della Scala), dedicando particolare attenzione all'allestimento dipinto dei portali e al loro significato in rapporto allo spazio urbano in cui si inserivano
Recent Advances in Quantum Dots for Photocatalytic CO2 Reduction: A Mini-Review
No full textSolar energy–driven carbon dioxide (CO2) reduction to valuable solar fuels/chemicals (e.g., methane, ethanol, and carbon monoxide) using particulate photocatalysts is regarded as one of the promising and effective approaches to deal with energy scarcity and global warming. The growth of nanotechnology plays an eminent role in improving CO2 reduction (CO2R) efficiencies by means of offering opportunities to tailor the morphology of photocatalysts at a nanoscale regime to achieve enhanced surface reactivity, solar light absorption, and charge separation, which are decisive factors for high CO2R efficiency. Notably, quantum dots (QDs), tiny pieces of semiconductors with sizes below 20 nm, offering a myriad of advantages including maximum surface atoms, very short charge migration lengths, size-dependent energy band positions, multiple exciton generation effect, and unique optical properties, have recently become a rising star in the CO2R application. In this review, we briefly summarized the progress so far achieved in QD-assisted CO2 photoreduction, highlighting the advantages of QDs prepared with diverse chemical compositions such as metal oxides, metal chalcogenides, carbon, metal halide perovskites, and MXenes. © Copyright © 2021 Park, Murali, Modigunta, In and In.1
On Computing the Vertex Connectivity of 1-Plane Graphs
No full textA graph is called 1-plane if it has an embedding in the plane where each edge is crossed at most once by another edge. A crossing of a 1-plane graph is called an ×-crossing if there are no other edges connecting the endpoints of the crossing (apart from the crossing pair of edges). In this paper, we show how to compute the vertex connectivity of a 1-plane graph G without ×-crossings in linear time.
To do so, we show that for any two vertices u,v in a minimum separating set S, the distance between u and v in an auxiliary graph Λ(G) (obtained by planarizing G and then inserting into each face a new vertex adjacent to all vertices of the face) is small. It hence suffices to search for a minimum separating set in various subgraphs Λ_i of Λ(G) with small diameter. Since Λ(G) is planar, the subgraphs Λ_i have small treewidth. Each minimum separating set S then gives rise to a partition of Λ_i into three vertex sets with special properties; such a partition can be found via Courcelle’s theorem in linear time
Le pitture murali di Ala di Stura (Piemonte): un tesoro nascosto
No full textNel piccolo villaggio montano di Ala di Stura (Piemonte, Valli di Lanzo) sono state censite 110 pitture murali divise tra affreschi con temi religiosi e meridiane. Le opere sono databili tra il XVI e il XXI secolo. Per supportare il lavoro di promozione turistica operato dal Comune di Ala di Stura, sono stati prelevati micro campioni dalle pitture più importanti sui quali eseguire analisi mediante spettroscopia Raman, in modo da avere informazioni utili per la conservazione, la datazione e la conoscenza globale delle opere stesse, poco conosciute al di fuori dell’ambito locale. Le analisi hanno permesso di chiarire fenomeni di alterazione cromatica (viraggio dei pigmenti di piombo), di individuare pigmenti che fungono da marcatori temporali (blu oltremare sintetico, verdi di arsenico) e di avere informazioni sull’origine e l’utilizzo dei materiali pittorici impiegati dagli artisti che hanno operato ad Ala di Stura. Di particolare interesse il fatto che quasi tutti i pigmenti impiegati sono riconducibili a minerali presenti nelle Valli di Lanzo, tra cui l’olivenite, un raro arseniato di rame utilizzato come pigmento verde
I dipinti murali e la quadreria di Filippo Donini
No full textIl capitolo prende in esame, anche grazie a documenti inediti d'archivio, le pitture murali del perugino palazzo Donini, eseguite nel secondo venticinquennio del Settecento da una serie di artisti tra cui spiccano Francesco Appiani, Giacinto Boccanera e Sebastiano Ceccarini. La trattazione della decorazione pittorica del palazzo è preceduta da una storia della pittura a Perugia nella prima metà del XVIII secolo
An Application-Specific Design Methodology for On-chip Crossbar Generation
No full textDesigning a power-efficient interconnection architec- ture for MultiProcessor Systems-on-Chips (MPSoCs) satisfying the application performance constraints is a nontrivial task. In order to meet the tight time-to-market constraints and to effec- tively handle the design complexity, it is essential to provide a computer-aided design tool support for automating this task. In this paper, we address the issue of “application-specific design of optimal crossbar architecture” satisfying the performance re- quirements of the application and optimal binding of the cores onto the crossbar resources. We present a simulation-based design approach that is based on the analysis of the actual traffic trace of the application, considering local variations in traffic rates, temporal overlap among traffic streams, and criticality of traffic streams. Our approach is physical design aware, where the wiring complexity of the crossbar architecture is also considered during the design process. This leads to detecting timing violations on the wires early in the design cycle and to having accurate estimates of the power consumption on the wires. We apply our methodology onto several MPSoC designs, and the synthesized crossbar plat- forms are validated for performance by cycle-accurate SystemC simulation of the designs. The crossbar matrix power consumption values are based on the synthesis of the register transfer level models of the designs, obtained using industry standard tools. The experimental case studies show large reduction in communication architecture power consumption (45.3% on average) and total wirelength (38% on average) for the MPSoC designs when com- pared with traditional design approaches. The synthesized cross- bar designs also lead to large reduction in transaction latencies (up to 7×) when compared with the existing design approaches.LSI
The effect of temperature on batch growth of Gracilaria salicornia and Gracilaria changii / Thurga Murali
No full textSeaweed (or macroalgae) serve as the foundation of productive food webs containing economically valuable species and their influence extends far beyond the shallow water in which they live. They are also effective at carbon sequestration, converting roughly half of the carbon dioxide in the atmosphere into organic compounds that are used to produce critical cellular constituents and increase energy production. Despite the importance of algal diversity and carbon sequestration, knowledge of how global or ocean warming affects them is still limited. Temperature can affect the development and photosynthesis of algae, particularly their biochemical and physiological processes. This study looked at how increased temperature impacts the growth of seaweeds, specifically Gracilaria species, a well-known and significant agarophytic genus in Malaysia, in terms of physiological and biochemical features, as well as the highest temperature tolerated by the species. The seaweeds were grown under four different temperatures; 28±1.0, 32±1.0, 36±1.0 and 40±1.0oC. ANOVA analysis of G. salicornia and G. changii showed a significant difference (P < 0.05) on the growth between the controlled temperature and elevated temperature treatments for each point, particularly at 40oC, indicating that higher temperature could negatively affect the growth and photosynthetic activity of Gracilaria spp. The highest Fv/Fm was recorded at 28oC for G. salicornia and 32oC for G. changii, which are 0.6968 and 0.6158, respectively. A further increase of temperature at 40oC led to a huge decline from 0.6256 to 0.0254 and 0.5798 to 0.0904 for samples G. salicornia and G. changii, respectively. As temperature increased, a declining trend was observed for gel strength, melting temperature, and gelling temperature of G. salicornia and G. changii up to the final day of the experiment. The reactive oxygen species (ROS) levels in both G. salicornia and G. changii fluctuated between the fifth and fifteenth day. The physiological and biochemical properties of Gracilaria spp. have been affected when different temperature stresses were introduced
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