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Atmosphere ◽  
2021 ◽  
Vol 12 (12) ◽  
pp. 1707
Author(s):  
Tinh Thai ◽  
Ales Bernatik ◽  
Petr Kučera

Air pollution associated with suspended particles has become a significant concern in Vietnam recently. The study aimed to (1) investigate dust sources; (2) measure concentration levels of Total Suspended Particulate (TSP), Particulate Matter (PM) fractions; (3) identify silica levels and the correlation with respirable particles at a cement grinding plant in Vietnam. A total of 312 samples (52 TSP, 160 PMs) at 13 processes were measured using the direct-reading dust meter. The silica composition was analyzed in a certified laboratory using the X-ray fluorescence (XRF) technique. SPSS version 26 for Window was used to analyze the data. The operations of the cement grinding plant created multiple dust sources from the jetty to the cement dispatch process. The TSP levels ranged 0.06–38.24 mg m−3, and 40.38 % (n = 21) TSP samples exceeded the Permissible Exposure Limit (PEL) for an 8-h working shift. Besides that, there was a wide range and significant concentration levels of PMs in the cement processes. The levels of PMs were PM1 (0.00–0.06 mg m−3), PM2.5 (0.01–0.83 mg m−3), PM4 (0.02–4.59 mg m−3), PM7 (0.03–16.94 mg m−3), and PM10 (0.04–26.85 mg m−3). The highest mean levels of PMs factions were measured at the pre-grinding process. The inefficient operation of the dust collector contributed a significant factor to the dust dispersion in this process. The silica’s mean (SD) composition in respirable dust was 20.4 % (0.86) and was not significantly different amongst the processes. There was a significant correlation between the levels of respirable dust and silica exposure in the cement grinding plant (r = 0.99). The improvement of indoor air quality is needed to prevent health effects on cement workers.


2021 ◽  
Author(s):  
◽  
Nicholas Wilkey

<p>In Haruki Murakami’s Hard-Boiled Wonderland and the End of the World, reality and imagination are infused in an interplay of narratives. The story is about discovering the identity of Self, using a walled city as a metaphor for the subconscious. The novel weaves the stories of two characters, the external self and the internal self, each chapter flicking between the real and the dream, from conscious to unconscious. Murakami provides the reader with a contemplation on the nature of existence, being versus non-being. Dr William S Haney, Professor of Literary Theory and specialist on culture and consciousness, argues that the shadow in Murakami’s allegory is a representation of the mind. As the narrative unfolds, the shadow—stripped from its owner—slowly dies, causing loss of memory, emotion and desire. The relinquishing of one’s shadow in the allegory suggests a loss of the metaphysical aspect of Self. The Shadow is not merely seen as an immaterial entity; rather it is the sign of full corporeality. The Shadow grants meaning to existence, illuminating the reality that we cannot perceive the light without the darkness.  This thesis is born out of a concern for the dearth of meaning in architecture in an age of uncertainty. In the modern contemporary sphere, we have become obsessed with the image, with rationalistic tendencies; with evermore light and luminosity, architecture has primarily been caught up in trying to order and rationalise the world. In this condition of objectification and reduction, architecture risks falling into a trap of homogeneity, thereby limiting itself to an empty datum of quantification. Thus, the unhygienic, the disorder and the chaos, the darkness that grants life its pungency, have been ‘relegated to the shadows’. Roberto Casati, senior researcher and Professor of Philosophy at the Centre National de la Recherche Scientique and an authority on shadow perception, argues that shadows avoid direct reading: “[t]he interaction of the two unequal brothers has been described in different ways, from the notion that shadows are ‘holes in the light’ through to the opposite idea that they are ‘the remaining representatives on earth of the cosmic darkness, otherwise torn apart by light’”. Viewed in this sense, Shadows can be seen as both corporeal operation—bound to the physical cycles of earth, moon and sun—and metaphysical entity, alluding to the primordial darkness before the birth of light and matter.  The allegory of the Shadow in Hard-Boiled Wonderland can be seen as a rumination on the loss of the metaphysical aspect of Self in a contemporary cybernetic age. In Murakami’s novel, the shadow cannot enter the walled Town; it must be left behind in the Shadow Grounds, the threshold between inner and outer realms. The Gateway, as described in Murakami’s novel, becomes the provocateur for this thesis. Interpreting Murakami’s architectural and allegorical program of the Gateway and Shadow Grounds in relation to Penelope Haralambidou’s seminal article “The Allegorical Project: Architecture as Figurative Theory”, this design-led research investigation interrogates the use of the Allegorical Architectural Project as a critical method. Allegory provides a structure of thought whereby meaning is not grasped immediately, but rather through progressive discovery and continual interpretation of its ambiguous traits. Ambiguity in architecture has the ability to appear ever-changing, resist resolution and remain open to interpretation.  The methodology of the investigation explores the spatial realm of the shadow through the critical and creative process of drawing. The principal aim of this thesis is to journey into the darkness, to embrace the shadow of the unknown, searching for a space in-between—between light and shadow, architecture and art, reality and fiction, the constructed and the imagined. Using Haruki Murakami’s Hard Boiled Wonderland and The End of the World as a generator and provocateur, the research employs the notion of the shadow as both mythological entity and corporeal signifying process. Rather than seeking concrete conclusions, it posits a speculative allegorical architectural project that invites critical engagement and interpretation. It argues that architecture occupies the liminal position between darkness and light, the true place of human existence, and as such, the design of Shadow is essential to the meaningful design of architecture.  The thesis investigation asks: how can the speculative architectural drawing be used as a means of interrogating the realm, and enhancing our awareness of, the shadow in architecture?</p>


2021 ◽  
Author(s):  
◽  
Nicholas Wilkey

<p>In Haruki Murakami’s Hard-Boiled Wonderland and the End of the World, reality and imagination are infused in an interplay of narratives. The story is about discovering the identity of Self, using a walled city as a metaphor for the subconscious. The novel weaves the stories of two characters, the external self and the internal self, each chapter flicking between the real and the dream, from conscious to unconscious. Murakami provides the reader with a contemplation on the nature of existence, being versus non-being. Dr William S Haney, Professor of Literary Theory and specialist on culture and consciousness, argues that the shadow in Murakami’s allegory is a representation of the mind. As the narrative unfolds, the shadow—stripped from its owner—slowly dies, causing loss of memory, emotion and desire. The relinquishing of one’s shadow in the allegory suggests a loss of the metaphysical aspect of Self. The Shadow is not merely seen as an immaterial entity; rather it is the sign of full corporeality. The Shadow grants meaning to existence, illuminating the reality that we cannot perceive the light without the darkness.  This thesis is born out of a concern for the dearth of meaning in architecture in an age of uncertainty. In the modern contemporary sphere, we have become obsessed with the image, with rationalistic tendencies; with evermore light and luminosity, architecture has primarily been caught up in trying to order and rationalise the world. In this condition of objectification and reduction, architecture risks falling into a trap of homogeneity, thereby limiting itself to an empty datum of quantification. Thus, the unhygienic, the disorder and the chaos, the darkness that grants life its pungency, have been ‘relegated to the shadows’. Roberto Casati, senior researcher and Professor of Philosophy at the Centre National de la Recherche Scientique and an authority on shadow perception, argues that shadows avoid direct reading: “[t]he interaction of the two unequal brothers has been described in different ways, from the notion that shadows are ‘holes in the light’ through to the opposite idea that they are ‘the remaining representatives on earth of the cosmic darkness, otherwise torn apart by light’”. Viewed in this sense, Shadows can be seen as both corporeal operation—bound to the physical cycles of earth, moon and sun—and metaphysical entity, alluding to the primordial darkness before the birth of light and matter.  The allegory of the Shadow in Hard-Boiled Wonderland can be seen as a rumination on the loss of the metaphysical aspect of Self in a contemporary cybernetic age. In Murakami’s novel, the shadow cannot enter the walled Town; it must be left behind in the Shadow Grounds, the threshold between inner and outer realms. The Gateway, as described in Murakami’s novel, becomes the provocateur for this thesis. Interpreting Murakami’s architectural and allegorical program of the Gateway and Shadow Grounds in relation to Penelope Haralambidou’s seminal article “The Allegorical Project: Architecture as Figurative Theory”, this design-led research investigation interrogates the use of the Allegorical Architectural Project as a critical method. Allegory provides a structure of thought whereby meaning is not grasped immediately, but rather through progressive discovery and continual interpretation of its ambiguous traits. Ambiguity in architecture has the ability to appear ever-changing, resist resolution and remain open to interpretation.  The methodology of the investigation explores the spatial realm of the shadow through the critical and creative process of drawing. The principal aim of this thesis is to journey into the darkness, to embrace the shadow of the unknown, searching for a space in-between—between light and shadow, architecture and art, reality and fiction, the constructed and the imagined. Using Haruki Murakami’s Hard Boiled Wonderland and The End of the World as a generator and provocateur, the research employs the notion of the shadow as both mythological entity and corporeal signifying process. Rather than seeking concrete conclusions, it posits a speculative allegorical architectural project that invites critical engagement and interpretation. It argues that architecture occupies the liminal position between darkness and light, the true place of human existence, and as such, the design of Shadow is essential to the meaningful design of architecture.  The thesis investigation asks: how can the speculative architectural drawing be used as a means of interrogating the realm, and enhancing our awareness of, the shadow in architecture?</p>


Author(s):  
James Sipich ◽  
Christian L'Orange ◽  
Kimberly Anderson ◽  
Christopher Limbach ◽  
John Volckens ◽  
...  

2021 ◽  
Vol 5 (2) ◽  
pp. 904-917
Author(s):  
Anita Maria Magdalena Silaban ◽  
Mila Tejamaya

Measurement of nanoparticles in the personal breathing zone (PBZ) is an effort to assess the risk of nanoparticle exposure in the workplace. Can be done with Direct-Reading as a monitor effort. Indonesia, as one of the countries that also participates in the use of nanotechnology, requires a measurement method that is appropriate to its conditions. Methods: this systematic literature review examines direct-reading methods. Result: two types of instruments were found for direct reading. Results: by conducting an assessment in accordance with the conditions of the Indonesian state, this study recommends Condensation particle counter (CPC) as an instrument that can be used


2021 ◽  
pp. 132-143
Author(s):  
Aungsiri Tipayarom ◽  
Prayad Sangngam ◽  
Siraphop Pinitkarn

This study aimed to develop relationships between particulate matter (PM) concentrations obtained from a direct-reading instrument to those from a gravimetric method. TSI DustTrak II Aerosol Monitors (Model 8530), a direct-reading instrument for PM10 and PM2.5 measurement, together with personal air pumps connected to a Sensidyne cyclone and a SKC Personal Environmental Monitor (PEM) for gravimetric PM10 and PM2.5 measurements respectively were deployed in the Faculty of Science building, Silpakorn University, Nakhon Pathom, Thailand. Comparison of the results from each instrument indicated that PM10 and PM2.5 concentrations obtained from the TSI DustTrak were higher. The linear relationship from ordinary least squares (OLS) regression between PM10 data determined by TSI DustTrak (x) and Sensidyne cyclone (y ̂) was significant (R2=0.92) and could be represented as y ̂ = 0.272x. For PM2.5, the relationship between concentrations determined by TSI DustTrak (x) and SKC PEM (y ̂) was also significant (R2=0.92) and represented by y ̂ = 4.848√x. Validation of both equations was undertaken by comparing predicted values from these relationships against the actual concentrations found by gravimetric analysis, with R2=1.0 and 0.92 for PM10 and PM2.5, respectively. It is suggested that these site-specific OLS regression equations can provide fast and convenient estimation of concentrations derived by gravimetric analysis from direct-reading TSI DustTrak monitor data.


Electronics ◽  
2021 ◽  
Vol 10 (15) ◽  
pp. 1848
Author(s):  
Sen-Tung Wu ◽  
Fu-Yuan Chen ◽  
Min-Chu Chien ◽  
Jian-Min Wang ◽  
Yan-Ying Su

In this study, a new control strategy was proposed to improve transient response and the input current harmonic distortion of power factor correction (PFC) regulators operating in an average current mode. The proposed technique required only two additional gain selectors and a peak detector circuit on the feedforward voltage loop and output voltage feedback loops. It provided a direct reading for the average voltage value of feedback control loops and the peak voltage of feedforward control loops, producing PFC boost regulators with fast dynamic responses and low-input current harmonic distortion. The use of digital potentiometers for directly changing the gain of control loops did not require any divider or squarer to reduce the complexity of control circuits. The operating principles and control strategies of 300 W boost PFC with the new control strategy are presented with detailed analysis and discussion. The experimental results were satisfactory.


Sigurnost ◽  
2021 ◽  
Vol 63 (2) ◽  
pp. 165-180
Author(s):  
Giulio Arcangeli ◽  
Stefano Dugheri ◽  
Nicola Mucci ◽  
Daniela Massi ◽  
Lucia Trevisani ◽  
...  

This review is directed at preventive health professionals, anatomic pathologists and technicians to focus their attention on the rapidly growing field of safe formalin practices. An updated overview of the most recent improvements in preventive measures versus formaldehyde (FA) in the anatomic pathology laboratories (APL) is provided. The occupational hygienist role and the required knowledge for a modern and clear occupational exposure assessment are described. Real-time, in-continuous, commercial analyzers for repeated FA exposure assessment are considered to evaluate technical changes in air monitoring programs, introduced to mitigate FA emissions, in compliance with the adopted limit values. To better choose the adequate instrumentation, the main features of each FA monitoring instrument recently introduced on the market are listed. Moreover, the main features of the modern workflow setting in APL are summarized. A computer-based scientific and non-scientific reports search by key-words was performed on PubMed, Web of Science, Google Scholar and Google Patents databases, querying the following topics: i) grossing workstation for ergonomic layout, ii) commercially available direct reading tools to measure formalin, iii) real-time, in-continuous FA monitoring instruments for sale. This review represents a useful tool to summarize the technical requirements and expert know-how necessary to minimize FA emissions and produce an exhaustive FA assessment in the APL.


2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Yasser Baharfar ◽  
Mahmoud Mohammadyan ◽  
Faramarz Moattar ◽  
Parvin Nassiri ◽  
Mohammad Hassan Behzadi

PurposeThis paper aims to present the most influential factors on classroom indoor PM2.5 (Particulate Matter < 2.5 µ), determining the level of PM2.5 concentration in five pre-schools located in the most densely populated district of the Tehran metropolitan area (district 6) as a case study to consider the children's exposure to air pollutants and introducing a suitable model, for the first time, to predict PM2.5 concentration changes, inside pre-schools.Design/methodology/approachIndoor and outdoor classes PM2.5 concentrations were measured using two DUSTTRAK direct-reading instruments. Additional class status information was also recorded; concurrently, urban PM2.5 concentrations and meteorological data were obtained from the fixed monitoring stations and Meteorological Organization. Then, the predicted concentrations of the indoor PM2.5, from introduced multiple linear regression model via SPSS, compared with the nearest urban air pollution monitoring stations data.FindingsThe average outdoor PM2.5 concentration (43 ± 0.32 µg m−3) was higher than the mean indoor (32 ± 0. 21 µg m−3), and both were significantly (p < 0.001) surpassing the 24-h EPA standard level. The indoor PM2.5 concentrations had the highest level in the autumn (48.7 µg m−3) and significantly correlated with the outdoor PM2.5 (r = 0.94, p < 0.001), the number of pupils, ambient temperature, wind speed, wind direction and open area of the doors and windows (p < 0.001). These parameters, as the main determinants, have led to present a 7-variable regression model, with R2 = 0.705, which can predict PM2.5 concentrations in the pre-school classes with more than 80% accuracy. It can be presumed that the penetration of outdoor PM2.5 was the main source of indoor PM2.5 concentrations.Research limitations/implicationsThis study faced several limitations, such as accessibility to classrooms, and limitations in technicians' numbers, leading to researchers monitoring indoor and outdoor PM concentrations in schools once a week. Additionally, regarding logistical limitations to using monitoring instruments in pre-schools simultaneously, correction factors by running the instruments were applied to obtain comparable measurements.Originality/valueThe author hereby declares that this submission is his own work and to the best of its knowledge it contains no materials previously published or written by another person.


Author(s):  
Ika Sulistiani ◽  
I GD Yudha Partama ◽  
Sang Putu Kaler Surata ◽  
I Ketut Sumantra

The Covid-19 pandemic has increased the improvement of air quality in various countries in the world, such as China, Italy, New York, India, Spain and Korea. This study aims to compare ambient air quality during the Covid-19 pandemic with new normal and normal periods, assess the effect of meteorological factors on ambient air quality, and map the spatial distribution of ambient air quality during the normal, Covid-19 pandemic and new normal in the ITDC Nusa Dua area. Air concentration parameter data and meteorological factors were collected using the midget impinger and direct reading method in 2019 (normal period), March and May 2020 (Covid-19 pandemic period) and July, September, and November 2020 (new normal period). Furthermore, comparing air quality using the Anova test, assessing the effect of meteorological factors on air quality using a linear regression test, and mapping the distribution of ambient air using the ArcGis 10.8 application. The analysis showed that the air quality during the Covid-19 pandemic and the new normal was significantly different from the normal period. The concentrations of SO2, NO2, NH3, CO, TSP and H2S during the Covid-19 pandemic and normal just decreased while the O3 concentration increased compared to the normal period. The meteorological factor that affects air quality is the wind speed, the higher the wind speed the lower the O3 concentration. Map of the distribution of spatial concentrations of SO2, NO2, NH3, CO, O3 and H2S in the normal, Covid-19 pandemic and new normal, lowest at the coast point of the peninsula and the highest distribution at the ITDC roundabout, bima statue or influence TSP is the highest spatial concentration of normal distribution at the ITDC roundabout and the bima statue, while the Covid-19 pandemic and normal are only at the coast point of the peninsula beach.Keywords: ambient air quality; Covid-19; pandemic; tourism.


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