scholarly journals Resent constructions of road bridges’ expansion joints

2021 ◽  
Vol 7 (2) ◽  
pp. 42-54
Author(s):  
Angelina A. Trifonova ◽  
Sergey V. Alekseev ◽  
Alexey M. Yegoshin
Keyword(s):  
Structural Reliability ◽  
Bridge Construction ◽  
Expansion Joints ◽  
Advantages And Disadvantages ◽  
Support Plate ◽  
Closed Type ◽  
Operational Life ◽  
Different Types ◽  
Metal Support ◽  
Effective Models

At present, there are high requirements for materials and construction elements in civil engineering in common. These intentions are fully applicable to such bridge construction elements as expansion joints. The new developed models are needed, in which all the defects and limitations of the previous models are solved and the maximum of operational life is reached. The main types of bridge expansion joints: closed joints, filled-type joints, covered joints. In this article the construction features, advantages and disadvantages of the listed expansion joints are considered. On the basis of the gotten results it is seen that new and developed models of different types expansion joints have better rates in all of considered criteria. It means that these joints have bigger structural reliability and provide longer operational life of the construction. The most effective models of bridge expansion joints are: closed-type joints with metal support plate, filled-type joints with convex V-shaped compensator and covering slab, covered joints with finger slabs and flap hinged rods and springs.

Studies on Chemical Methods to Expose Gate/Tunnel Oxide and Identification of Gate/Tunnel Oxide Defects in Wafer Fabrication

2002 ◽  
Author(s):  
Y. N. Hua ◽  
G. B. Ang ◽  
S. Redkar ◽  
Yogaspari ◽  
Wilma Richter
Keyword(s):  
Acetic Acid ◽  
Silicon Oxide ◽  
Wafer Fabrication ◽  
Chemical Methods ◽  
Advantages And Disadvantages ◽  
Different Types ◽  
Capacitor Structure ◽  
Oxide Defects ◽  
Buffer Oxide Etchant ◽  
Etch Time

Abstract In failure analysis of wafer fabrication, currently, three different types of chemical methods including 6:6:1 (Acetic Acid/HNO3/HF), NaOH and Choline are used in removing polysilicon (poly) layer and exposing the gate/tunnel oxide underneath. However, usage is limited due to their disadvantages. For example, 6:6:1 is a relatively fast etchant, but it is difficult to control the etch time and keep the oxide layer intact. Also, while using NaOH to remove poly and expose the silicon oxide, the solution needs to be heated. It is also difficult to etch a poly layer with a WSix or a CoSix silicide using NaOH. In this paper, we will discuss these 3 etchants in terms of their advantages and disadvantages. We will then introduce a new poly etchant, called HB91. HB91 is useful for removing poly to expose the gate/tunnel oxide for identification of related defects. HB91 is actually a mixture of two chemicals namely nitric acid (HNO3) and buffer oxide etchant (BOE) in a 9:1 ratio. The experimental results show that it is highly selective in poly removal with respect to the gate/tunnel oxide and is a suitable poly etchant especially for removing polysilicon with/without WSix and CoSix in the large capacitor structure. Application results of this poly etchant (HB91) will be presented.

Lexical-Grammatical Status and Lexicographic Presentation of Two-Component Stable Prepositional Combinations

2021 ◽  
pp. 32-51
Author(s):  
Elena V. Generalova ◽  
Keyword(s):  
Summary Table ◽  
Complex Issue ◽  
Dictionary Entry ◽  
Figurative Meaning ◽  
Advantages And Disadvantages ◽  
Unresolved Question ◽  
Two Component ◽  
Different Types ◽  
Syntactic Properties ◽  
Theoretical Issues

The aim of the article is to review the ways of dictionary presentation of stable prepositional combinations and the factors essential for their lexical-grammatical status and the type of optimal lexicographic description. The object of the study is twocomponent prepositional combinations with stable meanings and the “preposition+noun” structure. The material of the article is data of different dictionaries of Russian presenting stable prepositional combinations. In the course of the study, the following questions were answered: why the definition and interpretation of the lexical-grammatical nature of stable prepositional combinations are so difficult and ambiguous; what lexicographic interpretation these units have in dictionaries of different types; what the advantages and disadvantages of different ways of dictionary interpretation of such language material are. The following methods were used: introspective (observation, generalization, classification), systematic lexicographic description according to dictionary parameters, dictionary definition analysis. The summary table of the lexicographic presentation of stable combinations allows seeing both the unresolved question of dictionary interpretation of such units and the patterns of their interpretation depending on the type of a dictionary. As a result of the analysis the following conclusions were drawn. 1) In modern Russian there is a rather large (about 2,000 units) class of language units (prepositional combinations), the lexical-grammatical status of which is not defined, and there is no term for their definition; this class is historically formed and continues to replenish. 2) The type of dictionary presentation of stable prepositional combinations is determined by the dictionary concept, grammatical and syntactic properties, presence of figurative meaning and possibility of component variation of such combinations. 3) The unresolved theoretical issues have as a result the lexicographic discrepancy in the presentation of these language units. Extreme lexicographic solutions are a separate dictionary entry for each combination and the presentation of such units only as stable combinations in the entry of a noun (presented in academic explanatory dictionaries). 4) Taking into account only the factor of presence/absence of a gap seems to formalize the dictionary presentation of adverbs with both conjoined and split spelling, really existing in Russian, and the position of recognition of these units with independent words and their isolate presentation is not impeccable for dictionary users. 5) In the author’s opinion, the presentation of stable prepositional combinations exclusively as independent vocabules is inferior to the traditional lexicographic approach because the isolated presentation of this material breaks the semantic connections of these complex lexical units; the most complex issue is the differentiation of adverbs with split spelling and stable combinations.

Udziały jednostek samorządu terytorialnego w podatkach państwowych

Studia BAS ◽  
2021 ◽  
Vol 1 (65) ◽  
pp. 147-169
Author(s):  
Katarzyna Wójtowicz
Keyword(s):  
Fiscal Federalism ◽  
Final Section ◽  
National Income ◽  
Income Taxes ◽  
Local Revenue ◽  
Advantages And Disadvantages ◽  
Different Types ◽  
Fiscal Efficiency ◽  
Tax Sharing ◽  
Basic Features

The aim of this paper is to explore the rationale for the reform of the shares of local government units (LGUs) in national income taxes in Poland as well as to evaluate the selected proposals for changes in this area. The paper begins by outlining the definition and the basic features of tax sharing in the context of fiscal federalism. The next section provides an overview of the tax shares operating in some OECD countries. The main part of the article focuses on the key principles of the tax sharing system in Poland. The author briefly examines the fiscal efficiency of this source of local revenue in different types of Polish LGUs and the most significant dysfunctions of Polish local tax shares. The final section investigates the most important proposals for the reform of tax sharing and discusses their advantages and disadvantages.

Introduction of FECs and its Applications on Internet & Wireless Communications

2011 ◽  
Vol 403-408 ◽  
pp. 1776-1780
Author(s):  
Yan Ma ◽  
Chun Lan Ma
Keyword(s):  
Wireless Communications ◽  
Error Correction ◽  
Error Correction Coding ◽  
Advantages And Disadvantages ◽  
Coding Method ◽  
Different Types

This article focuses on FECs which is an error correction coding method and its applications in Internet and wireless communications. First, this article begins with the principles and the types of FECs. Then some typical applications n Internet and Wireless communications for each type of FECs are outlined. The next step is a comparison of the advantages and disadvantages between different types of FECs.

scholarly journals Place of Transport in the Sales Policy of the Industrial Enterprise

2021 ◽  
pp. 5-11
Author(s):  
О. A Hodoskina ◽  
О. Y Moiseienkova
Keyword(s):  
Continuous Process ◽  
Industrial Enterprise ◽  
Production Structure ◽  
Functional Dependencies ◽  
Advantages And Disadvantages ◽  
Marketing Policy ◽  
Different Types ◽  
Marketing Activities ◽  
Weak Points ◽  
Mode Of Transport

Purpose. Currently, the organization of sales at the enterprise is the main and continuous process that provides the enterprise with its economic efficiency and bringing the goods to the consumer. The purpose of this work is to analyze and compare modes of transport and its role in the marketing of products by an enterprise. Methodology. To build a model for the marketing activity of an enterprise, as well as when modeling the mechanism of functioning of its organizational, economic and production structure and the place of transport in the structure of an industrial enterprise, elements of economic and mathematical modeling were used. Analysis of the data obtained allows you to choose the best method of transportation, which is extremely important to ensure that the needs of the enterprise, as well as the needs of consumers, are met. Findings. Marketing and logistics services of the enterprise need, having studied all the advantages and disadvantages of all types of transport, to choose the most optimal mode of transport when transporting goods. For the sale of its products, the enterprise should take into account that over time, the costs of different types of transport may change, and the transportation schemes should be revised. The paper compares the modes of transport and the structure of freight turnover by mode of transport (as a percentage of the total). Originality. The use of a mathematical apparatus in the construction of functional dependencies that make up a general economic and mathematical model that characterizes the organization of the marketing activities of an enterprise will allow not only to identify «weak» points, but also to adjust the marketing policy of the enterprise accordingly, relying not on abstract conclusions, but on the obtained clear dependencies. Practical value. The result is, first of all, a reduction in costs in the marketing policy of the enterprise and an increase in competitiveness, an increase in profits and maximum satisfaction of consumer requirements.

scholarly journals Investigation of a Turbogenerator Based on the Vortex Expansion Machine with a Peripheral Side Channel

2021 ◽  
Vol 8 (1) ◽  
pp. F11-F18
Author(s):  
S.M. Vaneev ◽  
V.S. Martsynkovskyy ◽  
A. Kulikov ◽  
D.V. Miroshnichenko ◽  
Ya.І. Bilyk ◽  
...  
Keyword(s):  
Electricity Generation ◽  
Experimental Studies ◽  
Geometric Parameters ◽  
Working Fluid ◽  
Advantages And Disadvantages ◽  
Lateral Channel ◽  
Different Types ◽  
Flow Part ◽  
Special Stand ◽  
Constant Improvement

The creation of energy-saving turbogenerators is an essential component of the development of small energy systems. The gradual growth of interest in distributed electricity generation necessitates the constant improvement of these units. Moreover, they implement a more environmentally friendly generation method than when using microturbine units that use fuel to carry out the work process. Nowadays, turbogenerators are created based on different types of expansion machines, which have their advantages and disadvantages, given in this article. Compared to competitors, vortex expansion machines have good prospects and the necessary potential to expand their research and produce turbogenerators. An experimental vortex expansion machine with a peripheral-lateral channel and ability to change the geometric parameters of its flowing part was created to meet these needs. Experimental studies of the machine were performed on a special stand with air as a working fluid. As a result of the tests, the data were successfully obtained and processed. They are presented in the form of tables and graphical dependencies. The nature of the influence of thermodynamic parameters and geometric parameters of the flow part on the efficiency of the vortex expansion machine and turbogenerator based on it to further improve and create new turbogenerators is clarified.

scholarly journals An Experimental Study on the Effect of Tire Powder on the Geotechnical Properties of Clay Soils

2018 ◽  
Vol 4 (3) ◽  
pp. 594 ◽  
Author(s):  
Davood Akbarimehr ◽  
Esmael Aflaki
Keyword(s):  
Clay Soil ◽  
Geotechnical Properties ◽  
Atterberg Limits ◽  
Clay Soils ◽  
Positive Effects ◽  
Advantages And Disadvantages ◽  
Different Types ◽  
Problematic Soils ◽  
Geotechnical Problems ◽  
Comprehensive Study

With respect to the increasing production of tire wastes, the use of these wastes as an additive in civil engineering has always gained attentions of researchers due to their positive effects on material properties and reduction of environmental problems. Clay soils, as problematic soils, have always caused geotechnical problems including high Atterberg limits and consequently low workability. Tire powder, as one of the products of tire wastes, lacks clay cohesion and it can be effective in altering the plasticity of clay soils. As no comprehensive study has been conducted in this regard specifically on Tehran clay soil yet, this research studies experimentally the effect of adding different percentages of tire powder to clay soil at the Atterberg limits of clay soils with two different types of plasticity. More over according to previous studies, the effect of tire powder on other geotechnical properties of clay soils and the advantages and disadvantages of using tire powder in clay soils are discussed. The results indicate that addition of tire powder to clay soils has positive effects on reducing the Atterberg limits, increasing efficiency, and improving resistance, permeability, swelling reduction, and settlement properties, and reducing soil density and it can be used as an additive in improving clay soils.

scholarly journals Biotechnological valorization of agro industrial and household wastes for lactic acid production

2019 ◽  
Vol 21 (1) ◽  
pp. 113-127 ◽  
Author(s):  
Juliana Romo-Buchelly ◽  
María Rodríguez-Torres ◽  
Fernando Orozco-Sánchez
Keyword(s):  
Lactic Acid ◽  
Large Scale ◽  
Lactic Acid Production ◽  
Scale Production ◽  
Advantages And Disadvantages ◽  
Large Scale Production ◽  
Different Types ◽  
High Transformation ◽  
Transformation Potential ◽  
The Cost

Lactic acid (LA) is an organic compound used in several industries, such as food, textile, chemical, and pharmaceutical. The global interest  in  this  product  is  due  to  its  use  for  the  synthesis  of  numerous  chemical  compounds,  including  polylactic  acid,  a  biode-gradable thermoplastic and substitute for petroleum-derived plastics. An in-depth overview of the use of industrial and household wastes as inexpensive substrates in order to reduce the cost of LA production is presented. A review is carried out of the biotech-nological aspects that must be taken into account when using some wastes with high transformation potential to produce LA in a submerged  culture,  as  well  recommendations  for  their  use.  The  advantages  and  disadvantages  of  different  types  of  treatments used for the transformation of waste into suitable substrates are considered. Several methods of fermentation, as well as genetic strategies for increasing the production, are summarized and compared. It is expected that in a few years there will be many ad-vances in these areas that will allow greater large-scale production of LA using agroindustrial or household wastes, with potential positive economic and environmental impact in some regions of the planet.

Non-wearable human identification sensors for smart home environment: a review

Sensor Review ◽  
2018 ◽  
Vol 38 (3) ◽  
pp. 391-404 ◽  
Author(s):  
Ghassem Mokhtari ◽  
Nazli Bashi ◽  
Qing Zhang ◽  
Ghavam Nourbakhsh
Keyword(s):  
Home Environment ◽  
Smart Home ◽  
Body Shape ◽  
Human Identification ◽  
Content Type ◽  
Advantages And Disadvantages ◽  
Object Based ◽  
Different Types ◽  
Smart Home Environment ◽  
Identification Approach

Purpose This paper aims to provide a review of different types of non-wearable human identification sensors which can be applied for smart home environment. Design/methodology/approach The authors performed a systematic review to assess and compare different types of non-wearable and non-intrusive human identification sensors used in smart home environment. The literature research adds up to 5,567 records from 2000 to 2016, out of which 40 articles were screened and selected for this review. Findings In this review, the authors classified non-wearable human identification technologies into four main groups, namely, object-based, footstep-based, body shape-based and gait-based identification technologies. Assessing these four group of identification technologies showed that the maturity of non-wearable identification is not high and most of these technologies are verified in a lab environment. Additionally, footstep-based identification is the most popular identification approach listed in the literature. Originality/value This study contributes to the literature on human identification technologies in several ways. This paper identifies the state-of-the-art regarding non-wearable technologies which can be used in smart home environment. Moreover, the results of this paper can provide a better understanding of advantages and disadvantages of the non-wearable identification technologies.

Prediction of Structural Reliability Through an Alternative Variability-Based Methodology

2021 ◽  
Author(s):  
Kyle Haas
Keyword(s):  
Structural Reliability ◽  
Structural Model ◽  
Rapid Evolution ◽  
Structural Response ◽  
Quantitative Measure ◽  
Instability Index ◽  
Reliability Design ◽  
L2 Norm ◽  
Operational Life ◽  
Failure Conditions

Abstract The often-competing goals of optimization and reliability design amplify the importance of VVUQ to achieve sufficient reliability. Evaluation of a system's reliability presents practical challenges given the large number of permutations of conditions that may exist over the system's operational life cycle. Uncertainty and variability sources are not always well defined and are sometimes not possible to predict, yielding traditional UQ techniques insufficient. A variability-based method is proposed to bridge this gap in state-of-the-art UQ practice where sources of uncertainty and variability cannot be readily quantified. At the point of incipient structural failure, the structural response becomes highly variable and sensitive to minor perturbations in conditions. This characteristic provides a powerful opportunity to determine the critical failure conditions and to assess the resulting structural reliability through an alternative variability-based method. Non-hierarchical clustering, proximity analysis, and the use of stability indicators are combined to identify the loci of conditions that lead to a rapid evolution of the response toward a failure condition. The method's utility is demonstrated through its application to a simple nonlinear dynamic single-degree-of-freedom structural model. In addition to the L2-norm, a new stability indicator is proposed called the "Instability Index", which is a function of both the L2-norm and the calculated proximity to adjacent loci of conditions with differing structural response. The Instability Index provides a rapidly achieved quantitative measure of the relative stability of the system for all possible loci of conditions.

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