scholarly journals Development of Technological Solutions for Sewer Rehabilitation Using Clinker Brick

2021 ◽  
Vol 20 (6) ◽  
pp. 499-505
Author(s):  
D. F. Goncharenko ◽  
A. I. Aleinikova ◽  
S. V. Yesakova ◽  
R. I. Hudilin
Keyword(s):  
Polymer Materials ◽  
The Finite Element Method ◽  
Corrosion Resistant ◽  
Sewer Rehabilitation ◽  
Lining Structure ◽  
Clinker Brick ◽  
Cost Of Materials ◽  
The Cost ◽  
The City ◽  
Selection Of

The aim of the work is to develop a technology for the restoration of damaged sections of sewer collectors using clinker bricks. A significant part of such collectors in the Ukraine has completely exhausted their depreciation resource. For their construction, concrete and reinforced concrete were used, which are subject to destruction as a result of the influence of many factors and, above all, microbiological corrosion. Therefore, the selection of the optimal repair technology using corrosion-resistant clinker brick is relevant. The paper considers the problems of repair and reconstruction of worn-out collectors. Technical and technological solutions of an open method for their recovery using pneumatic formwork and corrosionresistant clinker brick are presented. The design of the collector lining structure has been carried out using the finite element method. To justify the feasibility of using the proposed technology, two options for restoring a worn-out collector have been considered: the “pipe-in-pipe” method and method developed by the authors using clinker bricks. The second option in terms of the cost of materials is almost four times more economical and more expedient than the first one (where polymer materials are used). The advantage of restoring circular sewer collectors by means of laying clinker bricks lies in the durability and resistance of this material (taking into account the anticorrosive composition of concrete) to the aggressive effects of the sewer environment. It should be noted that the application of the developed restoration technology is the most appropriate in conditions of sparse building or outside the city due to the significant volume of earthworks.

scholarly journals Identification of Problems Associated with the Usage of Friction (Koeppe) Hoists Based on Geodetic Measurements

Geosciences ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 444
Author(s):  
Agnieszka Ochałek ◽  
Wojciech Jaśkowski ◽  
Mateusz Jabłoński
Keyword(s):  
Laser Scanning ◽  
Terrestrial Laser Scanning ◽  
Indirect Costs ◽  
Measurement Methods ◽  
Legal Regulations ◽  
Direct And Indirect Costs ◽  
Cost Of Materials ◽  
The Cost ◽  
Assembly Component ◽  
Selection Of

The hoist assembly based on the Koeppe friction is a commonly used solution in mining. However, it has some disadvantages. A few centimeters offset of the groove axis can lead to excessive abrasion of linings on the Koeppe friction and pulleys. As a consequence, the mines are forced to bear the direct and indirect costs of replacing the linings such as the cost of materials and service as well as the cost of extended machine and shaft downtime. Last year, the authors undertook a geodetic inventory of the condition of two hoisting machines with a Koeppe winder. Terrestrial laser scanning enhanced with precision total station measurements were performed. Additionally, elements particularly important for the performed analysis (inclination of hoisting machine and rope wheels shafts) were determined by the precision leveling technique. Obtained results were verified using measurements on Szpetkowski’s tribrach. Appropriate selection of the measurement methods in both analyzed examples allowed us to determine the causes of destruction of each hoist assembly component. Based on precise geodetic data, guidelines have been defined for rectification (twisting and shifting the rope pulleys), which seems unavoidable despite the lack of unambiguous legal regulations.

Expert Evaluation of Municipal Revenues and Expenditures by Land Use Category

1988 ◽  
Vol 8 (1) ◽  
pp. 35-44
Author(s):  
Eric Heikkila ◽  
Peter Leckie
Keyword(s):  
Land Use ◽  
Expert Evaluation ◽  
Land Uses ◽  
The Cost ◽  
The City ◽  
Use Categories ◽  
Use Category ◽  
Selection Of

This paper outlines a method for assessing experts' evaluation of how municipal revenues and expenditures are allocated across land use categories. The method includes selection of experts, the nature of their interactions, and the process by which their diverse opinions may be meaningfully aggregated. This method is implemented for the City of Vancouver, using two distinct groups of experts. The results from these two groups' efforts are strikingly similar, suggesting that vacant and commercial land uses are net fiscal contributors, while residential and industrial uses do not on average contribute revenues that cover the cost of services rendered by the municipality.

scholarly journals Concretes with nanoadditive of fired recycled concrete

2020 ◽  
Vol 12 (5) ◽  
pp. 245-249
Author(s):  
B.V. Gusev ◽  
V.D. Kudryavtseva ◽  
V.A. Potapova
Keyword(s):  
Natural Resources ◽  
Housing Stock ◽  
Residential Buildings ◽  
Strength Properties ◽  
Recycled Concrete ◽  
Construction Waste ◽  
Cost Of Materials ◽  
The Cost ◽  
The City ◽  
Mineral Additives

The practice of using recycled concrete from the broken concrete of substandard reinforced concrete products can become widespread in practice. The undoubted relevance of this topic is explained by the program for the renovation of the housing stock in the city of Moscow, which provides for the demolition of 5-storey residential buildings until 2032. The problem of recycling and reuse of construction waste becomes obvious to improve the environmental situation, as well as to reduce the cost of materials in construction and preserve natural resources. The article deals with the nanostructuring of cement systems by means of introduction of ultra- and nanodispersed mineral additives. In this case, additional grinding of mineral additives is carried out in cavitation units. Nanostructuring provides the compaction of concrete structures and an increase in the strength properties of concrete.

scholarly journals Automated Low-Cost LED-Based Sun Photometer for City Scale Distributed Measurements

2021 ◽  
Vol 13 (22) ◽  
pp. 4585
Author(s):  
Cristobal Garrido ◽  
Felipe Toledo ◽  
Marcos Diaz ◽  
Roberto Rondanelli
Keyword(s):  
Temporal Resolution ◽  
Low Cost ◽  
Calibration Transfer ◽  
Calibration Uncertainty ◽  
Global Coverage ◽  
Sun Photometer ◽  
Cost Of Materials ◽  
The Cost ◽  
The City ◽  
Lower Temporal Resolution

We propose a monochromatic low-cost automatic sun photometer (LoCo-ASP) to perform distributed aerosol optical depth (AOD) measurements at the city scale. This kind of network could fill the gap between current automatic ground instruments—with good temporal resolution and accuracy, but few devices per city and satellite products—with global coverage, but lower temporal resolution and accuracy-. As a first approach, we consider a single equivalent wavelength around 408 nm. The cost of materials for the instrument is around 220 dollars. Moreover, we propose a calibration transfer for a pattern instrument, and estimate the uncertainties for several units and due to the internal differences and the calibration process. We achieve a max MAE of 0.026 for 38 sensors at 408 nm compared with AERONET Cimel; a mean standard deviation of 0.0062 among our entire sensor for measurement and a calibration uncertainty of 0.01. Finally, we perform city-scale measurements to show the dynamics of AOD. Our instrument can measure unsupervised, with an expected error for AOD between 0.02 and 0.03.

scholarly journals Comparative analysis of calculation methods for enclosing pit structures

2021 ◽  
Vol 18 (3) ◽  
pp. 92-99
Author(s):  
V. V. Konyushkov ◽  
Keyword(s):  
Comparative Analysis ◽  
The Finite Element Method ◽  
Calculation Methods ◽  
Preliminary Calculation ◽  
Elastic Line ◽  
Advantages And Disadvantages ◽  
Software Packages ◽  
The Stability ◽  
Cost Of Materials ◽  
Selection Of

Choosing the calculation method for the enclosing excavation pit structures is an urgent issue, since the results of the calculations determine the selection of the geometric and mechanical parameters, as well as the estimated cost of materials and works. At present, at calculation of the enclosing structures of excavation pits, there are used classical semi-graphical solutions, semi-analytical programs and software packages based on the finite element method. Each method has its own prerequisites and assumptions, as well as advantages and disadvantages. The purpose of this article is presentation of comparative analysis results of the main methods for calculating the enclosing structures of excavation pits considering their features and boundary conditions of application. The author has performed test calculations of the excavation pit enclosing structures using the elastic line method in the SCAD and PLAXIS 2D software packages. The author has also developed and proposed a simplified method for calculating pit fences. This method can be used at the pre-project stage of construction in the form of preliminary calculation or as additional verification calculation of the stability, strength and deformability of pit enclosing structures.

A Selection of Bandung City Travel Route Using The FLOYD-WARSHALL Algorithm

2020 ◽  
Vol 12 (7) ◽  
Author(s):  
Muhammad Ghifari Arfananda ◽  
◽  
Surya Michrandi Nasution ◽  
Casi Setianingsih ◽  
◽  
...  
Keyword(s):  
Traffic Congestion ◽  
Rapid Development ◽  
Route Selection ◽  
Tourist Attractions ◽  
Tourist Destinations ◽  
A Value ◽  
Distance Data ◽  
Simple Additive Weighting ◽  
The City ◽  
Selection Of

The rapid development of information and technology, the city of Bandung tourism has also increased. However, tourists who visit the city of Bandung have problems with a limited time when visiting Bandung tourist attractions. Traffic congestion, distance, and the number of tourist destinations are the problems for tourists travel. The optimal route selection is the solution for those problems. Congestion and distance data are processed using the Simple Additive Weighting (SAW) method. Route selection uses the Floyd-Warshall Algorithm. In this study, the selection of the best route gets the smallest weight with a value of 5.127 from the Algorithm process. Based on testing, from two to five tourist attractions get an average calculation time of 3 to 5 seconds. This application is expected to provide optimal solutions for tourists in the selection of tourist travel routes.

Determination of the minimum number of technological bases of a part

2020 ◽  
pp. 73-75
Author(s):  
B.M. Bazrov ◽  
T.M. Gaynutdinov
Keyword(s):  
Cost Price ◽  
Labor Input ◽  
Part Surface ◽  
Technological Base ◽  
Size Accuracy ◽  
Minimum Number ◽  
The Cost ◽  
Input Cost ◽  
Selection Of

The selection of technological bases is considered before the choice of the type of billet and the development of the route of the technological process. A technique is proposed for selecting the minimum number of sets of technological bases according to the criterion of equality in the cost price of manufacturing the part according to the principle of unity and combination of bases at this stage. Keywords: part, surface, coordinating size, accuracy, design and technological base, labor input, cost price. [email protected]

This Is an Abridged Account of Delhi Which Is an Old City and One of the Chosen Ones amongst the Cities

2018 ◽  
Author(s):  
Mirza Sangin Beg
Keyword(s):  
Popular Culture ◽  
East India Company ◽  
Ordinary People ◽  
Work Spaces ◽  
History Of ◽  
English East India Company ◽  
Local Traditions ◽  
The Cost ◽  
The City ◽  
Cost Of Construction

The second part of the translation has three segments. The first is dedicated to the history of Delhi from the time of the Mahabharat to the periods of Anangpal Tomar to the Mughal Emperor Humayun as also Sher Shah, the Afghan ruler. In the second and third segments Mirza Sangin Beg adroitly navigates between twin centres of power in the city. He writes about Qila Mubarak, or the Red Fort, and gives an account of the several buildings inside it and the cost of construction of the same. He ambles into the precincts and mentions the buildings constructed by Shahjahan and other rulers, associating them with some specific inmates of the fort and the functions performed within them. When the author takes a walk in the city of Shahjahanabad, he writes of numerous residents, habitations of rich, poor, and ordinary people, their mansions and localities, general and specialized bazars, the in different skills practised areas, places of worship and revelry, processions exemplifying popular culture and local traditions, and institutions that had a resonance in other cultures. The Berlin manuscript gives generous details of the officials of the English East India Company, both native and foreign, their professions, and work spaces. Mirza Sangin Beg addresses the issue of qaum most unselfconsciously and amorphously.

Bulking and Foaming Organism Control at Phoenix, AZ WWTP

1992 ◽  
Vol 26 (3-4) ◽  
pp. 461-472 ◽  
Author(s):  
O. E. Albertson ◽  
P. Hendricks
Keyword(s):  
Wastewater Treatment ◽  
Nitrogen Removal ◽  
Retention Time ◽  
Oxygen Transfer ◽  
Average Rate ◽  
Oxygen Transfer Efficiency ◽  
Solids Retention ◽  
Total Nitrogen Removal ◽  
The Cost ◽  
The City

A 1630 L/s activated sludge plant at Phoenix was limited to an average rate of 1050 L/s and operated, at 400-600 mg/L MLSS and 0.8-1.3 day solids retention time (SRT) due to bulking sludge and limited clarification capacity. Higher SRTs also produced uncontrolled Nocardia foaming and low dissolved oxygen due to partial nitrification. The City retained the services of a team of consultants to resolve these problems as well as to upgrade the plant to provide nitrification and total nitrogen removal. An anoxic selector design was implemented within the existing basin and the clarifiers were modified to improve inlet design and sludge transport. The modified advanced wastewater treatment (AWT) plant operating at 1450 L/s has averaged an effluent of 7.6 mg/L BOD5, 8.2 mg/L TSS, 1.3 mg/L NH4N, 4.1 mg/L NO3N and 2.9 mg/L TP. Oxygen transfer efficiency has increased about 80% in the nitrification-denitrification (NdeN) mode. The cost of modification/upgrading to AWT was approximately $730,000 and a 400 L/s increase in hydraulic capacity was realized. Upgrading costs were $5.63/m3 ($0.02/gal.)

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