scholarly journals HIDRÁULICA DE TUBOS DE BAMBU: COEFICIENTE C DE HAZEN-WILLIAMS

Irriga ◽  
1999 ◽  
Vol 4 (2) ◽  
pp. 80-94
Author(s):  
Marco Antonio dos Reis Pereira ◽  
Antonio De Padua Sousa
Keyword(s):  
Low Cost ◽  
Natural Material ◽  
Irrigation Practice ◽  
C Value ◽  
The Impact ◽  
Caixa Postal ◽  
E Mail ◽  
Dendrocalamus Giganteus ◽  
Physical And Mechanical Characteristics

HIDRÁULICA DE TUBOS DE BAMBU: COEFICIENTE C DE HAZEN-WILLIAMS   Marco Antonio dos Reis PereiraUnesp-Campus de Bauru Caixa postal 473 Tel.(014)-2302111 r.148  Fax 305070 E-mail [email protected]ônio de Pádua SousaUnesp-Campus de Botucatu-Fazenda Lageado Caixa postal 237 Tel.(014)8213883 Fax 213438   1 RESUMO   Dentre as mais de mil espécies de bambu existentes, as espécies gigantes parecem ser as mais adequadas para utilização como condutor de água. Dentre estas, a espécie Dendrocalamus giganteus (bambu gigante ou bambu balde) é relativamente comum em nosso meio, produzindo colmos com dimensões, características físicas e mecânicas compatíveis para este fim. No entanto, as informações disponíveis sobre suas características hidráulicas são escassas e geralmente referidas ao bambu em geral.O objetivo do presente trabalho foi verificar o comportamento hidráulico  dos tubos de bambu como conduto forçado. Para tanto foi elaborada e montada uma bancada de ensaios para experimentação destes tubos.Os colmos de bambu foram usinados internamente por meio de duas ferramentas construídas para este fim : uma ferramenta de impacto,  acionada manualmente  e outra, giratória, acionada por motor elétrico, promovendo diferentes qualidades na remoção dos diafragmas internos (nós), o que levou a observação de diferentes resultados, relativos aos valores determinados para  a  perda de carga  e para o coeficiente  C da equação de Hazen-Williams.Os resultados mostraram uma nítida influência da qualidade de remoção dos nós nos parâmetros hidráulicos obtidos. Assim, para a usinagem feita através de ferramenta de impacto com acionamento manual foi obtido o valor de C = 63 e, através da ferramenta giratória com acionamento elétrico, foi obtido o valor de C = 101, para tubos de bambu da espécie gigante (Dendrocalamus giganteus). Muito embora os valores do coeficiente C encontrados para os tubos de bambu sejam inferiores aos encontrados para tubos lisos de PVC (C = 140), ele pode ser considerado como  uma possível alternativa para uso como condutor de água para fins de irrigação de pequeno porte,  tendo em vista  seu baixo custo e facilidades em ser trabalhado e utilizado   UNITERMOS: Bambu, hidráulica, coeficientes. PEREIRA, M.A.R., SOUSA, A.P. HIDRAULICS OF BAMBOO TUBES: HAZEN-WILLIAMS’ COEFFICIENT IN BAMBOO TUBES HIDRAULICS   2 SUMMARY   The giant bamboo species seem to be suitable for using as a water conductor, concerning to their good agronomical, silvicultural, physical and mechanical characteristics and also due to culm dimensions showed by these species. However, few information is available to concerning their hidraulics characteristics.In this work, the giant bamboo (Dendrocalamus giganteus) specie was tested as a water conductor when submitted to a pressurized flow, verifying some hidraulics characteristics usually used in the irrigation practice as the C coefficient obtained from the Hazen-Williams’ equation. The bamboo tubes had their inner diaphragm (inner node) removed by two different tools , a hand working impact tool that produces a bad quality of the node remotion and an electrical working rotate tool that produces a good quality of the node remotion. The literature shows some C coefficient values as varying between 43 to 70 for a bad quality remotion of the inner nodes and between 65 to 90 for a good quality remotion.The research showed that the rotate tool produces better results than the impact tool as can be observed from the C coefficient obtained. A 63 C value was obtained with the impact tool or a bad node remotion quality, while a 101 C value was observed using the rotate tool or a good node remotion quality, for the giant bamboo tubes.In spite of the fact that bamboo tubes have a lower value to the C coefficient than the PVC tubes (C = 140) they can be used as water conductor, taking into consideration  that they are a natural material with low cost and  easy to be worked using simple tools.   KEYWORDS : Bamboo, hidraulic, coefficient.

scholarly journals The Role of Social Networks as a Tool for an Effective Recruitment Process in the Enterprises in Kosovo

2021 ◽  
Vol 8 (3) ◽  
pp. 384-388
Author(s):  
Blerim Dragusha ◽  
Vlora Prenaj
Keyword(s):  
Social Networks ◽  
Processing Speed ◽  
Low Cost ◽  
Competitive Advantages ◽  
Recruitment Process ◽  
Quality Of Information ◽  
The Impact ◽  
Main Factor

This paper focuses on the determinants of the impact of social networks on the recruitment process in Kosovar enterprises, concluding that the main factor of that impact is the quality of information, cost benefits, and timeliness. Another factor of particular importance is the competitive advantages social networks provide with respect to efficiently attracting suitable candidates to recruit through their unified data processing speed. The managers interviewed in this study provided evidence that recruitment using social networks is faster than with traditional methods. Social networks enable firms to quickly and easily access applicants from all over the world easily at a low cost. Social networks provide in-depth discussions to understand the views and opinions of both parties in the recruitment process. The information provided by social networks on the personal and professional life of the potential job candidate makes social networks an important tool for recruitment

scholarly journals Framework for the Simulation of Sensor Networks Aimed at Evaluating In Situ Calibration Algorithms

Sensors ◽  
2020 ◽  
Vol 20 (16) ◽  
pp. 4577
Author(s):  
Florentin Delaine ◽  
Bérengère Lebental ◽  
Hervé Rivano
Keyword(s):  
Sensor Networks ◽  
Sensor Network ◽  
Low Cost ◽  
Test Case ◽  
Dense Networks ◽  
In Situ Calibration ◽  
Primary Test ◽  
The Impact

The drastically increasing availability of low-cost sensors for environmental monitoring has fostered a large interest in the literature. One particular challenge for such devices is the fast degradation over time of the quality of their data. Therefore, the instruments require frequent calibrations. Traditionally, this operation is carried out on each sensor in dedicated laboratories. This is not economically sustainable for dense networks of low-cost sensors. An alternative that has been investigated is in situ calibration: exploiting the properties of the sensor network, the instruments are calibrated while staying in the field and preferably without any physical intervention. The literature indicates there is wide variety of in situ calibration strategies depending on the type of sensor network deployed. However, there is a lack for a systematic benchmark of calibration algorithms. In this paper, we propose the first framework for the simulation of sensor networks enabling a systematic comparison of in situ calibration strategies with reproducibility, and scalability. We showcase it on a primary test case applied to several calibration strategies for blind and static sensor networks. The performances of calibration are shown to be tightly related to the deployment of the network itself, the parameters of the algorithm and the metrics used to evaluate the results. We study the impact of the main modelling choices and adjustments of parameters in our framework and highlight their influence on the results of the calibration algorithms. We also show how our framework can be used as a tool for the design of a network of low-cost sensors.

Nudging Urban Food Pantry Users in Utah Toward Healthier Choices

2020 ◽  
pp. 152483992090468
Author(s):  
Casey Coombs ◽  
Mateja R. Savoie-Roskos ◽  
Heidi LeBlanc ◽  
Julie Gast ◽  
Jackie Hendrickson
Keyword(s):  
Low Cost ◽  
Dietary Quality ◽  
Healthy Foods ◽  
Chi Square ◽  
Convenience Sample ◽  
Food Pantry ◽  
Nutrition Programs ◽  
The Impact ◽  
Selection Of

Purpose. To evaluate the impact of a nudge program on food pantry clients’ self-reported selection and use of healthy foods. Method. A convenience sample of clients of six urban food pantries in Utah were surveyed about their experience with the Thumbs Up for Healthy Choices nudge program. Chi-square tests were used to identify associations between demographic characteristics and self-reported program impact. Results. Ninety-four percent (n = 158) of respondents agreed that the program made it easier to make healthy choices. Sixty-five percent reported healthier diets since its implementation. Additionally, Hispanic respondents were more likely to report positive impacts than non-Hispanic respondents. Conclusions and Implications. Nudge programs are effective in increasing the selection of healthy foods among pantry clients in Utah. Impacts seemed to be particularly positive for Hispanic pantry users in Utah. Nutrition programs should consider implementing these low-cost strategies to improve dietary quality of pantry users.

scholarly journals Assessing the impact of different grouping methods: time to rethink and regroup?

2017 ◽  
Vol 1 (1) ◽  
Author(s):  
Sean Randall ◽  
Anna Ferrante ◽  
Adrian Brown ◽  
James Boyd ◽  
James Semmens
Keyword(s):  
Record Linkage ◽  
Large Scale ◽  
Low Cost ◽  
Administrative Records ◽  
Grouping Strategy ◽  
Grouping Strategies ◽  
Linkage Quality ◽  
One To One ◽  
The Impact

ABSTRACT ObjectivesThe grouping of record-pairs to determine which administrative records belong to the same individual is an important process in record linkage. A variety of grouping methods are used but the relative benefits of each are unknown. We evaluate a number of grouping methods against the traditional merge based clustering approach using large scale administrative data. ApproachThe research aimed to both describe current grouping techniques used for record linkage, and to evaluate the most appropriate grouping method for specific circumstances. A range of grouping strategies were applied to three datasets with known truth sets. Conditions were simulated to appropriately investigate one-to-one, many-to-one and ongoing linkage scenarios. ResultsResults suggest alternate grouping methods will yield large benefits in linkage quality, especially when the quality of the underlying repository is high. Stepwise grouping methods were clearly superior for one-to-one linkage. There appeared little difference in linkage quality between many-to-one grouping approaches. The most appropriate techniques for ongoing linkage depended on the quality of the population spine and the underlying dataset. ConclusionsThese results demonstrate the large effect that the choice of grouping strategy can have on overall linkage quality. Ongoing linkages to high quality population spines provide large improvements in linkage quality compared to merge based linkages. Procuring or developing such a population spine will provide high linkage quality at far lower cost than current methods for improving linkage quality. By improving linkage quality at low cost, this resource can be further utilised by health researchers.

scholarly journals Utilização de filtro intermitente de areia como pós-tratamento de esgoto doméstico – estudo da taxa de aplicação superficial

2019 ◽  
Vol 1 (47) ◽  
pp. 95
Author(s):  
Robson Arruda Dos Santos ◽  
Gilson Barbosa Athayde Junior
Keyword(s):  
Low Cost ◽  
Application Rate ◽  
Environmental Benefits ◽  
Sand Filters ◽  
Treatment Unit ◽  
Sand Filter ◽  
Main Research ◽  
Application Rates ◽  
The Impact

<p class="Normal1">This research is the study of surface application rate for intermittent sand filter sizing, with emphasis to its constructive aspect. It is a design parameter set by the NBR 13969/1997 like the relation between the flow of sewage and surface area of a treatment unit. We examined the main research projects that studied the use of sand filter as post-treatment sewage, highlighting the superficial application rates used in these studies, comparing them with the recommendations of the Brazilian standard that deal with it. The results show that the NBR 13969/97 recommends a lower value to those obtained by Brazilian and foreigner researchers, and regarding Brazilian research, the value of the standard (100 L / m².dia) is always below the rates evaluated. Thus, we highlight the need to update the NBR 13969/97, for that would meet the actual demand for building sand filters, reactor treating of low cost of construction and maintenance, and good removal efficiency of organic matter and nitrification . The environmental benefits are indisputabl and the improvement of the quality of the effluent decreases the impact on water bodies and soil.</p>

Frequent 4D monitoring with DAS 3D VSP in deep water to reveal injected water-sweep dynamics

2020 ◽  
Vol 39 (7) ◽  
pp. 471-479 ◽  
Author(s):  
Denis Kiyashchenko ◽  
Albena Mateeva ◽  
Yuting Duan ◽  
Duane Johnson ◽  
Jonathan Pugh ◽  
...  
Keyword(s):  
Deep Water ◽  
Low Cost ◽  
Water Injection ◽  
Time Lapse ◽  
Reservoir Model ◽  
Seismic Profiles ◽  
Vertical Seismic Profiles ◽  
Distributed Acoustic Sensing ◽  
The Impact

Time-lapse monitoring using 3D distributed acoustic sensing vertical seismic profiles (DAS VSPs) is rapidly maturing as a nonintrusive low-cost solution for target-oriented monitoring in deep water. In a Gulf of Mexico field, DAS fibers deployed in active wells enable detailed tracking of the water flood in two deep reservoirs. Multiple tests in adverse well conditions let us understand the impact of source size and other factors on the spatially dependent quality of time-lapse DAS data and prove that excellent image repeatability is achievable under typical field conditions. Frequent repeat surveys allowed us to predict the timing of water arrival in a producer and to observe new water injection patterns that are important for understanding water-flood performance. Going forward, DAS 4D monitoring is envisioned as a tool that can assist with proactive wells and reservoir management, new well planning, and reservoir model updates.

Evaluation of Concrete Produced with Pebble from the Region of Tangará da Serra-MT

2014 ◽  
Vol 600 ◽  
pp. 264-270
Author(s):  
Karita P. Carvalho ◽  
Albéria C. Albuquerque ◽  
Juzélia S. Costa
Keyword(s):  
Mechanical Characteristics ◽  
Low Cost ◽  
Particle Packing ◽  
Mechanical Resistance ◽  
Hardened Concrete ◽  
Structural Concrete ◽  
Manufacturing Costs ◽  
Physical And Mechanical Characteristics

The distance of the points of delivery of aggregates stimulate entrepreneurs to search for new alternatives that meet their needs, with low cost and quality. This study rescues the use of pebble on the concrete in the region of Tangará da Serra - MT. Willing to collaborate with the industry, a concrete was produced using methods of particle packing in order to provide to the manufacturer a proposal that makes possible the quality of the product supplied. The aggregate and the cement were tested according to their physical and mechanical characteristics, while the properties of the hardened concrete were evaluated according to their mechanical resistance. The results indicated that the mix with pebble aggregate have suitable properties to be used as a structural concrete. Earnings due to rationalization, quality and reducing manufacturing costs are factors that will contribute to the product acceptance in the market.

scholarly journals Impact of Service Quality of Low-Cost Carriers on Airline Image and Consumers’ Satisfaction and Loyalty during the COVID-19 Outbreak

2021 ◽  
Vol 19 (1) ◽  
pp. 83
Author(s):  
Thowayeb H. Hassan ◽  
Amany E. Salem
Keyword(s):  
Customer Satisfaction ◽  
Service Quality ◽  
Brand Image ◽  
Low Cost ◽  
Strategic Plans ◽  
Low Cost Carriers ◽  
Levels Of Service ◽  
The Impact ◽  
Customer Satisfaction And Loyalty

Low-cost carriers (LCCs) in Saudi Arabia operate in a competitive, highly demanding environment. Customer-related attributes may be influenced by the levels of service quality in a no-frills airline, which might impact satisfaction and loyalty. Given the unique traveler and market characteristics of the aviation sector in the kingdom, we sought to investigate the impact of service quality of LCCs on customer satisfaction and loyalty and the perceived airline image. A total of 299 passengers at two international airports were approached using a modified SERVQUAL scale. Results revealed that service quality was a significant predictor of customer satisfaction (β = 0.46, p < 0.0001), airline image (β = 0.55, p < 0.0001), and customer loyalty (β = 0.16, p = 0.006). The responsiveness dimension was the most important dimension of service quality, since it predicted all other constructs (satisfaction, loyalty, and brand image). Airline tangibles and reliability were independently associated with brand image and loyalty, respectively. Based on these results, LCCs should tailor future strategic plans that rely heavily on improving different service quality measures, particularly the responsiveness domain.

scholarly journals A survey on the service quality of launch terminal in Bangladesh based on customers satisfaction

2021 ◽  
pp. 27-38
Author(s):  
Ali Ashraf ◽  
Ashik Mazumder ◽  
Shariar Rahman Sumon ◽  
Saddam Hossain ◽  
Anika Nowshin Mowrin
Keyword(s):  
Service Quality ◽  
Questionnaire Survey ◽  
Structural Equation ◽  
Low Cost ◽  
Equation Modeling ◽  
Transport Service ◽  
Loading And Unloading ◽  
The Impact ◽  
Significant Factors

Quality of the service and effectiveness of service operations system are considered as important aspects of achieving the customers' satisfaction of any service organization. Since it is considered as the low cost, safe and enjoyable travelling method by the passengers, it is need of the hour to identify the customer satisfaction towards the development of transport service methods in the Bangladesh especially in Launch Service. The major objective of this study is to identify the impact of inland transport service quality on passengers' satisfaction. The present study has been attempted to understand and examine the factors influencing the passenger’s satisfaction in the Launch Service. The study is exploratory in nature and used factor analysis to identify the foremost significant factors of Passenger’s satisfaction with service quality. By questionnaire survey we put our survey into five category those are tangibility, reliability, responsiveness, assurance, empathy (24 type question). Also, we took a part in photography survey. From photography and questionnaire survey we made a data and put that data into analysis. By analysis the data we made some pie chat and find a result. Though the satisfaction level is not good. From the result it is shown that bollard quality, dock railing system, mooring ropes quality, staff accommodation; those four parts of the launch terminal is very poor. Although bollard quality, cleanliness, dock to dock joint, snapback zone, watchtower service; those five parts of launch terminal is poor. Also, the docking system, lighting system, loading and unloading system, security system for passenger’s, hawker’s volume, terminal maintenance is average; those five parts of launch terminal is good. It is disappointing to say that there isn’t any canteen facility for the passengers. The rest of the part of the launch terminal is good. We also recommended some suggestion which improvement could make a far better passenger’s satisfaction. Keywords: Service Quality; Service Variables; Launch Terminal; Structural Equation Modeling

scholarly journals Impact of Task Types and CMC Technology on Exchange Quality: An Empirical Investigation

2010 ◽  
Vol 35 (1) ◽  
pp. 31-52
Author(s):  
Payal Mehra
Keyword(s):  
Decision Making ◽  
Social Interaction ◽  
Information Sharing ◽  
Organizational Communication ◽  
Task Performance ◽  
Instant Messaging ◽  
Information Generation ◽  
The Impact ◽  
E Mail

While globally, computer-mediated communication (CMC) has emerged as a powerful and a more satisfying medium to facilitate organizational communication, its increased use, particularly in emerging economies, raises concerns relating to its efficacy particularly when compared to the more ‘natural’ face-to-face communication. This paper examines the impact of CMC on the quality of organizational communication at the workplace. Analysing economic and relational dimensions of task performance, the paper investigates whether CMC enhances or debases the quality of interaction (exchange quality). Measured in terms of perceived satisfaction on economic and relational dimensions of task performance, the quality of exchange is examined with respect to three type of tasks — information generation, information sharing, and decision-making. The five independent variables under study are: frequency of media use, media familiarity, media choice (to facilitate task/social interaction), quality of information sharing, and the strength of relational tie among the team members. These five variables are examined with respect to two configurations —e-mail and instant messaging (IM). The dependent variable is the quality of the interaction (exchange quality). The results show that: the frequency of e-mail communication is a significant factor in facilitating effective communication. Frequent e-mail communication leads to media familiarity. Familiarity with CMC positively impacts satisfaction on task dimensions and results in improved communication. Satisfaction scores vary on the basis of the mode of communication. Users used e-mail as a rich medium to exchange task-related information, for analytical and judgmental tasks and as a lean medium for building relationships (especially at the brainstorming or information generation stage). In comparison to e-mail, IM is not as effective both on economic as well as relational dimensions of task performance. Though a synchronous medium with a higher perceived social presence than the e-mail, it rated low on familiarity and information sharing aspects. The strength of the relational ties shared by the group had a positive impact on the quality of social interaction. A large majority of the respondents opted for the FtF mode for information gathering task and the CMC mode for information exchange and decision-making tasks.

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