scholarly journals Evaluation and Optimization of Models' Priorities in Redesigning of Urban Parks in Semi-Mountainous Areas

2016 ◽  
Vol 12 (12) ◽  
pp. 43
Author(s):  
Parham Baghaie ◽  
Mohammad Reza Leylian
Keyword(s):  
Urban Areas ◽  
Qualitative Evaluation ◽  
Urban Parks ◽  
Field Studies ◽  
Mountainous Areas ◽  
Original Design ◽  
Social Functions ◽  
Design Changes ◽  
Architectural Research ◽  
Information Collecting

With the growing trend for semi-natural spaces in urban areas, urban parks and the related social behaviors have been faced with more interest. However, the flaw in the original design, changes in the park field and variation in living standards level of users, causes situation that lead to some inappropriate performance functions of the parks or parks unable to provide optimal quality of these functions. The main objective of this study was to address these failings and to advance the cause, using problem solving method proposed in this social-architectural research. In this context, semi-mountainous areas parks, review as case studies due to the nature of subject and locating in the particular region in the country for evaluation the priority of redesigning principles.To achieve this goal, redesigning in urban parks is defined and after studying worldwide experience and situation analysis, by using a qualitative evaluation in an urban park in Khoram-Abad, Arak and Hamadan, redesigning principles is proposed. The research method was descriptive-analytical and information collecting method have been taken by theoretical studies through library method and field studies including survey of the physical condition of the park and picked up a case study and statistical distribution of questionnaires among 224 presented persons in the park. The statistical analysis was performed on the responses of consumers by analysis program R and the frequency response is obtained. To assess the principles' priority of redesigning in the city's parks, the covariance was used.The results show that the three principles: consideration to the union, linkage and coordination between the initial layout and redesigning plan of parks, optimizing the ecological functions of Park and optimizing social functions of Park through the relevant mechanisms should be in interest and commitment in redesigning parks of semi-mountainous areas.

scholarly journals Modeling Spatiotemporal Population Changes by Integrating DMSP-OLS and NPP-VIIRS Nighttime Light Data in Chongqing, China

2021 ◽  
Vol 13 (2) ◽  
pp. 284
Author(s):  
Dan Lu ◽  
Yahui Wang ◽  
Qingyuan Yang ◽  
Kangchuan Su ◽  
Haozhe Zhang ◽  
...  
Keyword(s):  
Spatial Distribution ◽  
Relative Error ◽  
Urban Areas ◽  
Large Scale ◽  
Population Distribution ◽  
Spatial Optimization ◽  
Distribution Data ◽  
Mountainous Areas ◽  
Mean Relative Error ◽  
Nighttime Light

The sustained growth of non-farm wages has led to large-scale migration of rural population to cities in China, especially in mountainous areas. It is of great significance to study the spatial and temporal pattern of population migration mentioned above for guiding population spatial optimization and the effective supply of public services in the mountainous areas. Here, we determined the spatiotemporal evolution of population in the Chongqing municipality of China from 2000–2018 by employing multi-period spatial distribution data, including nighttime light (NTL) data from the Defense Meteorological Satellite Program’s Operational Linescan System (DMSP-OLS) and the Suomi National Polar-orbiting Partnership Visible Infrared Imaging Radiometer Suite (NPP-VIIRS). There was a power function relationship between the two datasets at the pixel scale, with a mean relative error of NTL integration of 8.19%, 4.78% less than achieved by a previous study at the provincial scale. The spatial simulations of population distribution achieved a mean relative error of 26.98%, improved the simulation accuracy for mountainous population by nearly 20% and confirmed the feasibility of this method in Chongqing. During the study period, the spatial distribution of Chongqing’s population has increased in the west and decreased in the east, while also increased in low-altitude areas and decreased in medium-high altitude areas. Population agglomeration was common in all of districts and counties and the population density of central urban areas and its surrounding areas significantly increased, while that of non-urban areas such as northeast Chongqing significantly decreased.

scholarly journals Wind Micro-Turbine Networks for Urban Areas: Optimal Design and Power Scalability of Permanent Magnet Generators

Energies ◽  
2018 ◽  
Vol 11 (10) ◽  
pp. 2759 ◽  
Author(s):  
Marco Palmieri ◽  
Salvatore Bozzella ◽  
Giuseppe Cascella ◽  
Marco Bronzini ◽  
Marco Torresi ◽  
...  
Keyword(s):  
Permanent Magnet ◽  
Urban Areas ◽  
Permanent Magnets ◽  
Design Procedure ◽  
Circuit Board ◽  
Small Scale ◽  
Electrical Machine ◽  
Direct Drive ◽  
Original Design ◽  
Power Capability

This work is focused on the design optimization of electrical machines that are used in small-scale direct-drive aerogenerators. A ducted wind turbine, equipped with a diffuser, is considered due to its enhanced power capability with respect to bare turbines. An annular type Permanent Magnet brushless generator is integrated in the turbine structure: the stator coils are placed in the internal part of the diffuser, whereas the permanent magnets are on an external ring connected to the turbine blade tips. Moreover, as regards the stator windings, the Printed Circuit Board (PCB) technology is investigated in order to exploit its advantages with respect to conventional wire coils, such as the increased current density capacity, the reduction of costs, and the enhanced precision and repeatability of the PCBs. An original design procedure is presented together with some scalability rules. An automated tool has been developed in order to aid the electrical machine designer in the first design stages: the tool performs multi-objective optimizations (using the Matlab Genetic Algorithm Toolbox), coupled to fast Finite Element analysis (through the open-source software FEMM) for the evaluation of the electromagnetic torque and field distribution. The proposed procedure is applied to the design of an annular PM generator directly coupled to a small-scale turbine for an urban application.

scholarly journals ANALISIS TINGKAT KETEPATAN WAKTU KRL COMMUTER LINE LINTAS TANAH ABANG-RANGKASBITUNG (STUDI KASUS: STASIUN CISAUK)

2020 ◽  
Vol 3 (3) ◽  
pp. 625
Author(s):  
Giovanni Bintang ◽  
Dewi Linggasari ◽  
Hokbyan Angkat
Keyword(s):  
Urban Areas ◽  
Research Method ◽  
Gap Analysis ◽  
Field Studies ◽  
Individual Characteristics ◽  
Tolerance Limit ◽  
Green Line ◽  
Tolerance Limits ◽  
Online Surveys ◽  
Delay Tolerance

Commuter Line trains are one of the modes of transportation that are very popular with the Jabodetabek community. KRL Commuter Line is capable of reducing the level of congestion in urban areas, so it is expected that the KRL Commuter Line is able to meet the needs of the community with punctuality in performance. This study’s purpose is to identify the timeliness of Green Line KRL departures by scheduling it and classify the level of Green Line KRL departure delays and determine solutions that can be applied to reduce the level of KRL Green Line departure. The research method used to collect data by online surveys and field studies. Then analyzed with Gap Analysis in order to obtain information about individual characteristics, characteristics of travel, and perceived delays according to KRL Green Line users. From the results of the analysis, it was found that KRL users have 3 late tolerance limits according to the Ministerial Regulation set a delay tolerance limit of 5 minutes while the results of the perception of KRL users on the Green Line lane tolerance limit of 5 minutes and finally according to KRL users at Cisauk Station tolerate delays by 10 minutes.  ABSTRAKKereta Commuter Line adalah salah satu moda transportasi yang sangat diminati masyarakat Jabodetabek. KRL Commuter Line juga dinilai mampu mengurangi tingkat kemacetan di perkotaan, sehingga diharapkan KRL Commuter Line mampu memenuhi kebutuhan masyarakat dengan ketepatan waktu dalam kinerjanya. Tujuan penelitian ini adalah untuk mengindentifikasi ketepatan waktu keberangkatan KRL Green Line dengan penjadwalannya serta mengklasifikasikan tingkat keterlambatan keberangkatan KRL Green Line dan menentukan solusi yang dapat diterapkan untuk mengurangi tingkat keterlambatan keberangkatan KRL Green Line. Metode Penelitian yang digunakan untuk mengumpulkan data adalah dengan survey online dan studi lapangan. Lalu dianalisis dengan Gap Analysis agar didapatkan informasi mengenai karateristik individu, karateristik perjalanan, dan persepsi keterlambatan menurut pengguna  KRL Green Line. Dari hasil analisis, didapat bahwa pengguna KRL mempunyai 3 batasan toleransi keterlambatan yaitu menurut Peraturan Menteri ditetapkan batas toleransi keterlambatan sebesar 5 menit sedangkan hasil dari persepsi pengguna KRL jalur Green Line batas toleransi keterlambatan sebesar 5 menit dan yang terakhir menurut pengguna KRL di Stasiun Cisauk menoleransikan keterlambatan sebesar 10 menit.

Simulation of the Cooking Organic Aerosol Concentration Variability in an Urban Area

2021 ◽  
Author(s):  
Evangelia Siouti ◽  
Ksakousti Skyllakou ◽  
Ioannis Kioutsioukis ◽  
Giancarlo Ciarelli ◽  
Spyros N. Pandis
Keyword(s):  
Urban Area ◽  
Urban Areas ◽  
Temporal Distribution ◽  
Late Summer ◽  
Field Studies ◽  
Organic Aerosol ◽  
Basis Set ◽  
Cooking Times ◽  
The City ◽  
Lunch Time

<p>Cooking operations can be an important fine PM source for urban areas. Cooking emissions are a source of pollution that has been often ignored and are not included or are seriously underestimated in urban emission inventories. However, several field studies in cities all over Europe suggest that cooking organic aerosol (COA) can be an important component of the total organic PM. In this study we propose and evaluate a methodology for the simulation of the COA concentration and its variability in space and time in an urban area. The city of Patras, the third biggest in Greece is used for this first application for a typical late summer period. The spatial distribution of COA emissions is based on the exact location of restaurants and grills, while the emissions on the meat consumption in Greece. We estimated COA emissions of 150 kg d<sup>-1</sup> that corresponds to 0.6 g d<sup>-1</sup> per person. The temporal distribution of COA was based on the known cooking times and the results of the past field studies in the area. Half of the daily COA is emitted during dinner time (21:00-0:00 LT), while approximately 25% during lunch time (13:00-16:00 LT). The COA is simulated using the Volatility Basis Set with a volatility distribution measured in the laboratory and is treated as semivolatile and reactive. The maximum average COA concentration during the simulation period is predicted to be 1.3 μg m<sup>-3</sup> in a mainly pedestrian area with a high density of restaurants. Peak hourly COA concentrations in this area exceed 10 μg m<sup>-3</sup> during several nights. The local production of secondary COA is predicted to be slow and it represents just a few percent of the total COA.</p><p> </p>

Spatiotemporal Dynamics of Urban Parks and Their Driving Forces in Xi'an, China from 1949 to 2015

2017 ◽  
Vol 42 (3) ◽  
pp. 112-115
Author(s):  
Xuhui Wang ◽  
Kewei Liu ◽  
Kai Wang ◽  
Jian Gong ◽  
Yanjun Wang ◽  
...  
Keyword(s):  
Urban Areas ◽  
Green Space ◽  
Driving Forces ◽  
Urban Parks ◽  
Spatiotemporal Dynamics ◽  
Green Spaces ◽  
Space Planning ◽  
Suburban Areas ◽  
Human Wellbeing ◽  
Average Size

Urban parks play a key role in recreational activities, public health, and ecosystem services in urban areas. Using GIS and Fragstats, this study investigated the spatiotemporal dynamics of urban parks in Xi'an, China from 1949 to 2015 and the corresponding driving forces. The results show that the number and area of parks in Xi'an increased constantly during this period, especially from 2000 to 2015. Up to 2015, small green spaces, usually adjacent to streets, occupied the largest proportion among all types of parks. Archaeological parks were the largest in total area, but wetland parks were leading in average size of a single park. The density of parks was negatively correlated with their distance to the Clock Tower at the center of Xi'an. The dynamics of urban parks in highly urbanized areas were significantly different from that of their counterparts in suburban areas. Driving forces such as urban planning, urbanization and green space policies, and milestone events in the city's development jointly had a great effect on the distribution of parks in Xi'an. The research outcomes will support the upcoming Green Space Planning of Xi'an and benefit the pursuit of sustainability and human wellbeing.

scholarly journals Model research on the influence of green roofs on environmental parameters in urban agglomerations

2018 ◽  
Vol 45 ◽  
pp. 00094 ◽  
Author(s):  
Dariusz Suszanowicz
Keyword(s):  
Heavy Metals ◽  
Urban Areas ◽  
Air Pollutants ◽  
Green Roof ◽  
Soil Layer ◽  
Environmental Parameters ◽  
Green Roofs ◽  
Field Studies ◽  
Air Pollutant ◽  
Laboratory Scale

This study presents features of green roofs in urban areas with a particular emphasis on the filtration of air pollutants, heavy metals removal, reduction of rainwater runoff from roof surfaces and thermal insulation. To carry out field studies on the influence of green roofs on the environment in urban areas, two green roof models on a laboratory scale were used. The observations of the prepared green roof models made during the summer, autumn and winter confirmed the extremely beneficial effect of this type of roof for the elimination of air pollutant, heavy metals, and particulate matter. The observations also confirmed that plants on a green roof growing on a soil layer absorb an average of 74% of rain water and then allow it to evaporate. The selection of plants for green roofs should mainly focus on how effectively they improve urban environmental parameters and remove air pollutants. The results of the study of the two green roof models on a laboratory scale are necessary to work out the parameters of layers of the roof and select the most appropriate plants for the reference research object on the roof of one of buildings of the University of Opole.

scholarly journals Assessment of Potential Supply of Ecosystem Services in Coimbra Municipality

Proceedings ◽  
2019 ◽  
Vol 30 (1) ◽  
pp. 25
Author(s):  
Leitão ◽  
Ferreira ◽  
Ferreira
Keyword(s):  
Land Use ◽  
Ecosystem Services ◽  
Urban Areas ◽  
Land Use Changes ◽  
Qualitative Evaluation ◽  
Well Being ◽  
Positive Potential ◽  
Environmental Pressures ◽  
Quantitative Classification ◽  
Natural Systems

Land-use changes driven by human activities affect natural systems. Urbanization, forest monoculture and intensive agriculture are changing the functioning of many biotic and abiotic processes. This tends to decrease the ability of ecosystems to provide services, which leads to several problems particularly in cities. This study investigates the ability of urban areas with great population and environmental pressures, to supply ecosystem services. The study was carried out in Coimbra municipality, through the assessment of regulation, provisioning and cultural services. The quantification of ecosystem services was based on the evaluation performed by experts familiar with the study area, through questionnaires. A total of 31 questionnaires were completed. The experts ranked the potential supply of 30 ecosystem services for the 33 existent land-uses. based on a qualitative evaluation: “strong adverse potential”, “weak adverse potential”, “not relevant”, “low positive potential” and “strong positive potential”. The qualitative evaluation was converted into a quantitative classification (−2, −1, 0, 1, 2). The values were used to develop an ecosystem services quantification matrix and to map the information in the study area, using Geographic Information Systems (GIS). Despite the limited ecosystem services provided by urban areas, agricultural fields and especially green spaces are relevant for the provision of resources essential for human survival and well-being. The methodology used in this work is still useful for the quantification of ecosystem services in cities with characteristics associated with the Mediterranean climate. This type of studies are important to (i) anticipate problems originated from the loss of ecosystem services, (ii) identify good and bad practices of land use changes, (iii) the role of connectivity in maintaining biotic and abiotic processes, and (iv) develop practices that promote the sustainable development of societies.

Incidences, Types, and Influencing Factors of Snow Disaster–Associated Injuries in Ningbo, China, 2008

2012 ◽  
Vol 6 (4) ◽  
pp. 363-369 ◽  
Author(s):  
Guozhang Xu ◽  
Yanyan Ying ◽  
Yan Liu ◽  
Wenjun Chang ◽  
Hongxia Ni ◽  
...  
Keyword(s):  
Public Health ◽  
Physical Exercise ◽  
Influencing Factors ◽  
Urban Areas ◽  
Traffic Accident ◽  
Public Health Intervention ◽  
Mountainous Areas ◽  
Public Health Preparedness ◽  
Cluster Probability ◽  
Regular Physical Exercise

ABSTRACTObjective:The incidence, types, and influencing factors of injuries due to snow-ice disasters are essential for public health preparedness. This study was designed to assess such factors of injuries during the 22-day snowstorm in Ningbo, Zhejiang Province, China, in 2008.Methods:A multistage cluster probability sampling method was applied to select the study population in urban, rural, and mountainous areas. Data including sociodemographic characteristics, frequency, and types of injuries during the snowstorm between January 20 and February 10, 2008, were obtained by face-to-face interviews using a structured questionnaire and by checking the participants' medical records. Univariate and multivariate regression analyses were used to determine the factors significantly associated with the risk of injuries.Results:A total of 3169 residents of 1416 families took part in this survey. In 581 residents, 602 injuries were identified. Incidences of frostbite, falling injury, and traffic accident–related injury were 12.78%, 5.30%, and 0.50%, respectively. Injury occurred more frequently in women than in men (odds ratio [OR], 1.42; 95% CI, 1.19-1.70). Frostbite occurred more frequently in women than in men (adjusted OR, 1.86; 95% CI, 1.43-2.41) and more frequently in urban areas than in other areas (adjusted OR, 1.65; 95% CI, 1.24-2.20). Travel by bus or car, wearing a scarf, wearing gloves, wearing a raincoat, reducing outdoor activity, and performing regular physical exercise were independent protective factors of frostbite, with an adjusted OR (95% CI) of 0.35 (0.20-0.61), 0.45 (0.33-0.62), 0.35 (0.26-0.48), 0.45 (0.33-0.61), 0.36 (0.27-0.48), and 0.18 (0.13-0.24), respectively. Falling injury occurred more often in mountainous areas than in other areas (adjusted OR, 1.74; 95% CI, 1.27-2.42). Age 45 years or older, working outside more than 15 days, and wearing a raincoat were independent risk factors of falling injury, with an adjusted OR (95% CI) of 2.30 (1.60-3.32), 1.92 (1.36-2.72), and 2.21 (1.56-3.11), respectively. Falling and traffic accident–related injuries were mainly due to slippery roads.Conclusions:Frostbite and falling injury were the major injuries caused by an unprecedented snow-ice disaster. Keeping warm and maintaining regular physical exercise appeared to reduce frostbite risk. Public health intervention also reduced the risk of falling and traffic accident–related injuries.(Disaster Med Public Health Preparedness. 2012;6:363-369)

scholarly journals Characterization of Organosulfates in Secondary Organic Aerosol Derived from the Photooxidation of Long-Chain Alkanes

2016 ◽  
Author(s):  
M. Riva ◽  
T. Da Silva Barbosa ◽  
Y.-H. Lin ◽  
E. A. Stone ◽  
A. Gold ◽  
...  
Keyword(s):  
Gas Phase ◽  
Urban Areas ◽  
Secondary Organic Aerosol ◽  
Field Studies ◽  
Organic Aerosol ◽  
Ultra Performance Liquid Chromatography ◽  
Urban Aerosol ◽  
Flight Mass Spectrometry ◽  
Phase Oxidation ◽  
Gas Phase Oxidation

Abstract. We report the formation of aliphatic organosulfates (OSs) in secondary organic aerosol (SOA) from the photooxidation of C10 – C12 alkanes. The results complement those from our laboratories reporting the formation of OSs and sulfonates from gas-phase oxidation of polycyclic aromatic hydrocarbons (PAHs). Both studies strongly support formation of OSs from gas-phase oxidation of anthropogenic precursors, hypothesized on the basis of recent field studies in which aromatic and aliphatic OSs were detected in fine aerosol collected from several major urban locations. In this study, dodecane, cyclodecane and decalin, considered to be important SOA precursors in urban areas, were photochemically oxidized in an outdoor smog chamber in the presence of either non-acidified or acidified ammonium sulfate seed aerosol. Effects of chemical structure, acidity and relative humidity on OS formation were examined. Aerosols collected from all experiments were characterized by ultra performance liquid chromatography coupled to electrospray ionization high-resolution quadrupole time-of flight mass spectrometry (UPLC/ESI-HR-QTOFMS). Most of the OSs identified could be explained by formation of gaseous epoxide precursors with subsequent acid-catalyzed reactive uptake onto sulfate aerosol. The OSs identified here were also observed and quantified in fine urban aerosol samples collected in Lahore, Pakistan, and Pasadena, USA. Many of the OSs identified from the photooxidation of decalin and cyclodecane are isobars of known monoterpene organosulfates, and thus care must be taken in the analysis of alkane-derived organosulfates in urban aerosol.

Solar Turbines Incorporated “Taurus 60” Gas Turbine Development

1994 ◽  
Author(s):  
Vern Van Leuven
Keyword(s):  
Gas Turbine ◽  
Mechanical Design ◽  
Selection Process ◽  
Thermodynamic Cycle ◽  
Turbine Rotor ◽  
Original Design ◽  
Design Changes ◽  
Third Stage ◽  
Final Design ◽  
Design Selection

The Taurus gas turbine was first introduced in 1989 with ratings of 6200 HP for single shaft and 6500 HP for twin shaft configurations. A new design of the single shaft third stage turbine rotor and exhaust diffuser brought its power to 6500 HP in 1991. A program was initiated early in 1992 to identify opportunities to further optimize performance of the Taurus. Thorough investigation of performance sensitivity to thermodynamic cycle parameters has resulted in significant improvement over the original design with no change in firing temperature. Aerodynamic and mechanical design changes were implemented in 1993 which raised Taurus performance to 7000 HP and 32% thermal efficiency. Selection of the final design configuration was the outcome of performance maximization versus cost increase, durability risk and loss of commonality with previous engines. This paper details these changes and the design selection process.

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