Current water main rehabilitation practice using trenchless technology

Abstract The market for water infrastructure rehabilitation is growing rapidly due to the increasing age of underground utilities. Currently, two common water main rehabilitation methods exist: cured-in-place pipe (CIPP) and polymer spray-on coatings. CIPP can provide structural support for both internal and external loads, while spray-on techniques provide chemical resistance as well as adding minor strength to the existing pipe. This paper summarizes water main rehabilitation practice using CIPP and spray-on methods. The history of trenchless rehabilitation technology is discussed, as well as current methodologies and products for water mains. The design, installation, and monitoring of water main rehabilitation products are also summarized, along with the associated risks. Quality assurance and control (QA/QC) methods are included for evaluating existing products and procedures.

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Demonstration and evaluation of an innovative water main rehabilitation technology: Cured-in-Place Pipe (CIPP) lining

Water Practice & Technology ◽

10.2166/wpt.2012.028 ◽

2012 ◽

Vol 7 (2) ◽

Cited By ~ 8

Author(s):

John C. Matthews ◽

Ariamalar Selvakumar ◽

Wendy Condit

Keyword(s):

Environmental Protection Agency ◽

Distribution Systems ◽

Water Distribution ◽

New Technologies ◽

Innovative Technology ◽

Demonstration Program ◽

Rehabilitation Technology ◽

Water Mains ◽

Water Main ◽

Willingness To Use

As many water utilities are seeking new and innovative rehabilitation technologies to extend the life of their water distribution systems, information on the capabilities and applicability of new technologies is not always readily available from an independent source. The U.S. Environmental Protection Agency (EPA) developed an innovative technology demonstration program to meet this need. The purpose of the demonstration program is to evaluate rehabilitation technologies that have the potential to reduce costs and increase the effectiveness of the operation, maintenance, and renewal of aging water distribution and wastewater conveyance systems. This paper provides an impartial assessment of the effectiveness and cost of a cured-in-place pipe (CIPP) lining technology for water main rehabilitation. This project demonstrated an innovative Class IV rehabilitation technology that met the project requirements and as part of the evaluation, multiple utilities expressed their willingness to use the technology in the future. The demonstration provided valuable information on the design, installation, and QA/QC of CIPP used to rehabilitate water mains, and makes recommendations for continued improvements in the process used for internal reinstatement of services. One issue that requires more study is the effect of pre-rehabilitation cleaning process on the service connection reinstatement process. Other issues contributing to the need for external reinstatement that should be studied and improved upon include: flush service connections that cannot be identified in smaller diameter pipes and difficulty drilling service connections located in folds.

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Toward a New Paradigm for Anthropology in Mexican Studies: Harmony Ideology: Justice and Control in a Zapotec Mountain Village . Laura Nader . ; Zapotec Women . Lynn Stephen . ; Social Inequality in Oaxaca. A History of Resistance and Change . Arthur D. Murphy , Alex Stepick . ; Ethnicity and Class Conflict in Rural Mexico . Frans J. Schryer .

Mexican Studies/Estudios Mexicanos ◽

10.1525/msem.1993.9.2.03a00090 ◽

1993 ◽

Vol 9 (2) ◽

pp. 303-336

Author(s):

Scott Cook

Keyword(s):

Social Inequality ◽

Class Conflict ◽

New Paradigm ◽

Mountain Village ◽

History Of ◽

Rural Mexico ◽

And Control

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THE RISK FACTORS OF MOLAR PREGNANCY

Journal of Medicine and Pharmacy ◽

10.34071/jmp.2017.1.8 ◽

2017 ◽

pp. 53-58

Author(s):

Lam Huong Le

Keyword(s):

High Risk ◽

Gestational Trophoblastic Disease ◽

Living Standard ◽

Control Group ◽

Uterine Perforation ◽

Molar Pregnancy ◽

Health It ◽

Pregnancy Risk ◽

History Of ◽

And Control

Objectives: Molar pregnancy is the gestational trophoblastic disease and impact on the women’s health. It has several complications such as toxicity, infection, bleeding. Molar pregnancy also has high risk of choriocarcinoma which can be dead. Aim: To assess the risks of molar pregnancy. Materials and Methods: The case control study included 76 molar pregnancies and 228 pregnancies in control group at Hue Central Hospital. Results: The average age was 32.7 ± 6.7, the miximum age was 17 years old and the maximum was 46 years old. The history of abortion, miscarriage in molar group and control group acounted for 10.5% and 3.9% respectively, with the risk was higher 2.8 times; 95% CI = 1.1-7.7 (p<0.05). The history of molar pregnancy in molar pregnancy group was 9.2% and the molar pregnancy risk was 11.4 times higher than control group (95% CI = 2.3-56.4). The women having ≥ 4 times births accounted for 7.9% in molar group and 2.2% in control group, with the risk was higher 3.8 times, 95% CI= 1.1-12.9 (p<0.05). The molar risk of women < 20 and >40 years old in molar groups had 2.4 times higher than (95% CI = 1.1 to 5.2)h than control group. Low living standard was 7.9% in molar group and 1.3% in the control group with OR= 6.2; 95% CI= 1.5-25.6. Curettage twice accounted for 87.5%, there were 16 case need to curettage three times. There was no case of uterine perforation and infection after curettage. Conclusion: The high risk molar pregnancy women need a better management. Pregnant women should be antenatal cared regularly to dectect early molar pregnancy. It is nessecery to monitor and avoid the dangerous complications occuring during the pregnancy. Key words: Molar pregnancy, pregnancy women

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Work and Technological Change

10.1093/oso/9780198795209.001.0001 ◽

2020 ◽

Author(s):

Stephen R. Barley

Keyword(s):

Artificial Intelligence ◽

Historical Context ◽

Energy Transformation ◽

History Of ◽

Work And Organizations ◽

Role Based ◽

Control Technologies ◽

And Control ◽

Work And Employment

The four chapters of this book summarize the results of thirty-five years dedicated to studying how technologies change work and organizations. The first chapter places current developments in artificial intelligence into the historical context of previous technological revolutions by drawing on William Faunce’s argument that the history of technology is one of progressive automation of the four components of any production system: energy, transformation, and transfer and control technologies. The second chapter lays out a role-based theory of how technologies occasion changes in organizations. The third chapter tackles the issue of how to conceptualize a more thorough approach to assessing how intelligent technologies, such as artificial intelligence, can shape work and employment. The fourth chapter discusses what has been learned over the years about the fears that arise when one sets out to study technical work and technical workers and methods for controlling those fears.

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Galileo Unbound

10.1093/oso/9780198805847.001.0001 ◽

2018 ◽

Cited By ~ 1

Author(s):

David D. Nolte

Keyword(s):

Free Fall ◽

The Sun ◽

Quantum Field ◽

Many Worlds ◽

Quantum Particles ◽

Light Rays ◽

History Of ◽

And Control ◽

The Universe ◽

Insight Into

Galileo Unbound: A Path Across Life, The Universe and Everything traces the journey that brought us from Galileo’s law of free fall to today’s geneticists measuring evolutionary drift, entangled quantum particles moving among many worlds, and our lives as trajectories traversing a health space with thousands of dimensions. Remarkably, common themes persist that predict the evolution of species as readily as the orbits of planets or the collapse of stars into black holes. This book tells the history of spaces of expanding dimension and increasing abstraction and how they continue today to give new insight into the physics of complex systems. Galileo published the first modern law of motion, the Law of Fall, that was ideal and simple, laying the foundation upon which Newton built the first theory of dynamics. Early in the twentieth century, geometry became the cause of motion rather than the result when Einstein envisioned the fabric of space-time warped by mass and energy, forcing light rays to bend past the Sun. Possibly more radical was Feynman’s dilemma of quantum particles taking all paths at once—setting the stage for the modern fields of quantum field theory and quantum computing. Yet as concepts of motion have evolved, one thing has remained constant, the need to track ever more complex changes and to capture their essence, to find patterns in the chaos as we try to predict and control our world.

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Animal Pain Scales in Public Policy

Alternatives to Laboratory Animals ◽

10.1177/026119299001800107.1 ◽

1990 ◽

Vol 18 (1_part_1) ◽

pp. 41-50

Author(s):

F. Barbara Orlans

Keyword(s):

Public Policy ◽

Animal Welfare ◽

The United States ◽

Pain Scale ◽

Laboratory Animals ◽

Practical Applications ◽

Animal Pain ◽

Pain Scales ◽

History Of ◽

And Control

Pain scales classify the severity of pain inflicted on laboratory animals from little or none up to severe. A pain scale as part of public policy serves beneficial purposes that promote animal welfare. It can be used to educate people about the two alternatives of refinement and replacement, and the need to reduce animal pain. Furthermore, a pain scale has practical applications: 1) in review procedures for animal welfare concerns; 2) in developing policies on the use of animals in education; and 3) as a basis for collecting national data on animal experimentation, so that meaningful data can be collected on trends in reduction and control in animal pain. So far, only a few countries (including Sweden, the Netherlands, Canada and New Zealand) have adopted pain scales as part of their public policy. Most countries, including the United States, have not yet done so. The history of the development and adoption of pain scales by various countries is described and the case is presented for wider adoption of a pain scale in countries not currently using one.

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Surveillance and control of M. chimaera infections in the Tuscany Region, Italy

European Journal of Public Health ◽

10.1093/eurpub/ckaa166.705 ◽

2020 ◽

Vol 30 (Supplement_5) ◽

Author(s):

B Casini ◽

B Tuvo ◽

M Totaro ◽

A Baggiani ◽

G Privitera

Keyword(s):

Cardiac Surgery ◽

Cardiopulmonary Bypass ◽

Water Sample ◽

Case Finding ◽

Microbial Count ◽

Clinical Specimens ◽

Open Chest ◽

Microbiological Parameters ◽

History Of ◽

And Control

Abstract Background Disseminated M. chimaera infections among patients who underwent open-chest surgery with cardiopulmonary bypass have been associated with the contamination of heater-cooler devices (HCDs). The Tuscany region in the Decree 3822/2019 issued recommendations for the surveillance and control of M. chimaera infections. Methods In three Tuscan cardiac surgery centers, the case finding was carried out through evaluation and testing of patients with a history of HCD exposure (past 6 years) was performed. Water and aerosol samples were analyzed from each HCDs to determine the microbiological parameters required by the Directive 98/83/CE and to assess the presence of non-tuberculous mycobacteria (NTMs), according to the regional protocol. Results M. chimaera infection was not found in any patient and all clinical specimens tested negative. 22 HCDs were sampled (n.12 LivaNova, n.1 Terumo and n.9 Maquet) for a total of 114 samples (45, 8, 2 and 59 respectively). All the microbiological parameters were compliant, excepted for total microbial count at 36 °C that exceeded 100 CFU/ml in 50% (57/114) of samples and for the presence of P.aeruginosa in 10% (12/114). NTMs were detected in 16% (18/114) of HCDs: M. chimaera was identified in 11% (13/114) of samples and in 4% (5/114) M. gordonae. All aerosol samples were negative for NTMs, but in the HCDs Maquet, B.cereus were detected in 7% (4/59) of the samples, K.oxytoca in 2% (1/59), B.ursincola in 2% (1/59) and S. paucimobilis in 3% (2/59). Only S. paucimobilis was isolated also in the same HCD water sample. Conclusions The implementation of maintenance and disinfection procedures of HCDs was able to reduce the risk of contamination and aerosolization by NTMs but not of other microorganisms. Key messages Further strategies should be put in place for the cases finding. Moreover, reliable decontamination and identification of agents that can disrupt biofilms and increase chlorine susceptibility of mycobacteria are required.

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Cytotoxic Effects of N,N-Diethyl-Meta-Toluamide (DEET) on Sinonasal Epithelia

OTO Open ◽

10.1177/2473974x211009232 ◽

2021 ◽

Vol 5 (2) ◽

pp. 2473974X2110092

Author(s):

Jivianne T. Lee ◽

Saroj Basak

Keyword(s):

Cell Viability ◽

Chronic Rhinosinusitis ◽

Morphological Changes ◽

Environmental Toxicants ◽

Cytotoxic Effects ◽

Airborne Pollutants ◽

Cell Monitoring ◽

History Of ◽

And Control ◽

Dose Dependent

Although the etiology of chronic rhinosinusitis remains unknown, environmental factors including airborne pollutants and toxicants are postulated to contribute to its pathogenesis. However, the precise pathomechanisms with which environmental toxicants may contribute to chronic rhinosinusitis are not fully understood. The purpose of this pilot study is to examine the cytotoxic effects of N,N-diethyl- meta-toluamide (DEET), a commonly used pesticide, on sinonasal epithelial cells (SNECs). Sinus mucosa was obtained from 3 subjects without a history of chronic rhinosinusitis. Cultured SNECs were exposed to various concentrations of DEET (0-5 mM) for 6 days. Cell viability, proliferation, and morphologic changes were assessed using the MTT colorimetric dye assay and the Incucyte Live Cell Monitoring System. Statistically significant dose-dependent reduction in cell viability and proliferation was observed between exposure and control groups ( P < .05) at all concentrations tested. Dose-dependent cellular morphological changes were also seen. These findings indicate that DEET exposure induces dose-dependent cytotoxicity in sinonasal epithelia.

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