Field Evaluation of Ability of Photocatalytic Concrete Pavements to Remove Nitrogen Oxides

2012 ◽  
Vol 2290 (1) ◽  
pp. 154-160 ◽  
Author(s):  
Heather Dylla ◽  
Marwa M. Hassan ◽  
David Osborn
Keyword(s):  
Nitrogen Oxides ◽  
Real World ◽  
Field Evaluation ◽  
Field Studies ◽  
The United States ◽  
Operating Variables ◽  
Show Evidence ◽  
Solar Intensity ◽  
The Many ◽  
Photocatalytic Concrete

Numerous laboratory studies have demonstrated the ability of nano and ultrafine titanium dioxide (TiO2) photocatalytic pavements to trap and degrade nitrogen oxides in the air when irradiated with ultraviolet light. However, to understand better how photocatalytic pavements will perform under real-world conditions, field studies are necessary. Quantification of the reduction of nitrogen oxides (NOx) in field studies is difficult and challenging because of the many environmental and operating variables. The objective of this paper is to identify evidence of photocatalytic NOx reduction and to determine the environmental and operating factors that affect efficiencies under real-world conditions. A quarter-mile concrete roadway was sprayed with a photocatalytic coating in Baton Rouge, Louisiana. This section was the first field installation of TiO2 photocatalytic pavement in the United States. NOx concentrations were monitored for both the coated and uncoated sections simultaneously for 3 weeks during the spring season to measure photocatalytic degradation directly. Further, nitrates were collected from the coated and uncoated areas for evidence of photocatalytic NOx reduction. Results from both approaches show evidence of photocatalytic NOx reduction. Environmental factors with significant impact on photocatalytic efficiency include relative humidity, solar intensity, and wind speed and direction.

Book Reviews

2016 ◽  
Vol 54 (1) ◽  
pp. 243-246
Keyword(s):  
United States ◽  
Real World ◽  
Value Added ◽  
The United States ◽  
University Of California ◽  
Value Added Tax ◽  
Alternative Approach ◽  
Different Types ◽  
The Many

Roger H. Gordon of University of California, San Diego reviews “The Rise of the Value-Added Tax”, by Kathryn James. The Econlit abstract of this book begins: “Explores the evolution of the value-added tax (VAT) from relative obscurity to one of the world's most dominant revenue systems, why countries have adopted the VAT, and why different countries adopt different types of VAT. Discusses the rise of the value-added tax; an introduction to the good VAT; an introduction to the many real VATs in existence; the conventional approach to explaining the rise of the VAT; moving toward an alternative approach to explaining the rise of the VAT; case studies on the real-world challenges of VAT reform in Australia and the United States; and conclusions on the rise of the value-added tax.”

Applying the Devil's Works in a Holy Cause: Working-Class Popular Culture and the Salvation Army in the United States, 1879-1900

1997 ◽  
Vol 7 (2) ◽  
pp. 195-223
Author(s):  
Lillian Taiz
Keyword(s):  
United States ◽  
New York ◽  
New York City ◽  
Popular Culture ◽  
York City ◽  
The United States ◽  
Salvation Army ◽  
Public Meeting ◽  
The Many ◽  
Sunday Evening

Forty-eight hours after they landed in New York City in 1880, a small contingent of the Salvation Army held their first public meeting at the infamous Harry Hill's Variety Theater. The enterprising Hill, alerted to the group's arrival from Britain by newspaper reports, contacted their leader, Commissioner George Scott Railton, and offered to pay the group to “do a turn” for “an hour or two on … Sunday evening.” In nineteenth-century New York City, Harry Hill's was one of the best known concert saloons, and reformers considered him “among the disreputable classes” of that city. His saloon, they said, was “nothing more than one of the many gates to hell.”

Use of Biomonitoring to Control Toxics in the United States

1988 ◽  
Vol 20 (10) ◽  
pp. 101-108 ◽  
Author(s):  
Nelson A. Thomas
Keyword(s):  
Water Quality ◽  
Chronic Toxicity ◽  
National Policy ◽  
Single Species ◽  
Field Studies ◽  
The United States ◽  
Toxicity Tests ◽  
Toxic Pollutants ◽  
Receiving Waters ◽  
Biological Field

A biomonitoring program has been developed in support of the National Policy for the Development of Water Quality-Based Permit Limitations for Toxic Pollutants. The program focuses on the use of laboratory toxicity tests on aquatic plants and animals to predict ecosystem impact caused by toxic pollutants. Both acute and chronic toxicity tests were developed to test effluents and ambient waters. Laboratory and biological field studies were conducted at nine sites. Single species laboratory toxicity tests were found to be good predictors of impacts on the ecosystem when two or more species were used. Biomonitoring can be undertaken either on effluents and/or on the receiving waters. In that toxicity related to seeps, leachates and storm sewers has often been found upstream from dischargers, it is beneficial to conduct both effluent and ambient biomonitoring.

Real-life Field Studies of the NOx Removing Properties of Photocatalytic Surfaces in Roskilde and Copenhagen Airport, Denmark

2020 ◽  
Vol 01 ◽  
Author(s):  
Henrik Jensen ◽  
Pernille D. Pedersen
Keyword(s):  
Air Quality ◽  
High Stability ◽  
Reference Site ◽  
Real Life ◽  
Field Studies ◽  
The Real ◽  
Before And After ◽  
Parking Lot ◽  
Photocatalytic Concrete

Aims: To evaluate the real-life effect of photocatalytic surfaces on the air quality at two test-sites in Denmark. Background: Poor air quality is today one of the largest environmental issues, due to the adverse effects on human health associated with high levels of air pollution, including respiratory issues, cardiovascular disease (CVD), and lung cancer. NOx removal by TiO2 based photocatalysis is a tool to improve air quality locally in areas where people are exposed. Methods: Two test sites were constructed in Roskilde and Copenhage airport. In Roskilde, the existing asphalt at two parking lots was treated with TiO2 containing liquid and an in-situ ISO 22197-1 test setup was developed to enable in-situ evaluation of the activity of the asphalt. In CPH airport, photocatalytic concrete tiles were installed at the "kiss and fly" parking lot, and NOx levels were continuously monitored in 0.5 m by CLD at the active site and a comparable reference site before and after installation for a period of 2 years. Results: The Roskilde showed high stability of the photocatalytic coating with the activity being largely unchanged over a period of 2 years. The CPH airport study showed that the average NOx levels were decreased by 12 % comparing the before and after NOx concentrations at the active and reference site. Conclusion: The joined results of the two Danish demonstration projects illustrate a high stability of the photocatalytic coating as well as a high potential for improvements of the real-life air quality in polluted areas.

The Conference on Security and Cooperation in Europe and Other European Fora on Migration

1994 ◽  
Vol 28 (3) ◽  
pp. 580-590
Author(s):  
Jan Niessen
Keyword(s):  
Human Rights ◽  
The United States ◽  
Eastern European ◽  
Scientific Cooperation ◽  
High Commissioner ◽  
Protection Of Human Rights ◽  
Prevention Center ◽  
The Many ◽  
The Cold War ◽  
General Secretary

In the 1970s, during the Cold War era, European and North American states began a dialogue in Helsinki which became known as the Conference on Security and Cooperation in Europe (CSCE), or the Helsinki process. For Western states the CSCE served as a platform to raise questions related to security in Europe and the protection of human rights and fundamental freedoms. Eastern European states considered the CSCE as a means to secure the postwar borders and an opportunity to discuss economic and scientific cooperation. Today, 51 European States, plus the United States of America and Canada, participate in this process. Notwithstanding the many and often intense political tensions between the West and the East during those twenty years, quite a number of conferences, seminars and other meetings were held and a great many agreements were adopted and documents issued, dealing with matters related to CSCE's three main areas of concern: security in Europe; cooperation in the fields of economics, science, technology and environment; the promotion of human rights. In response to the fundamental changes in Europe in the late 1980s, the CSCE was given a new impetus and its operational framework was broadened. CSCE offices were established in Prague (CSCE Secretariat), Vienna (Conflict Prevention Center) and Warsaw (Office of Democratic Institutions and Human Rights) with the aim to strengthen and monitor compliance with CSCE commitments, especially in the area of human rights. A Parliamentary Assembly was established and met twice, first in Budapest and then in Helsinki. A General Secretary and a High Commissioner on Minorities were appointed, with offices in Vienna and The Hague, respectively.

scholarly journals National Trends in Emergency Department Care Processes for Acute Myocardial Infarction in the United States, 2005 to 2015

2020 ◽  
Vol 9 (20) ◽  
Author(s):  
Akshay Pendyal ◽  
Craig Rothenberg ◽  
Jean E. Scofi ◽  
Harlan M. Krumholz ◽  
Basmah Safdar ◽  
...  
Keyword(s):  
Myocardial Infarction ◽  
Acute Myocardial Infarction ◽  
Emergency Department ◽  
Length Of Stay ◽  
Real World ◽  
The United States ◽  
Emergency Department Care ◽  
Care Processes ◽  
Ed Visits

Background Despite investments to improve quality of emergency care for patients with acute myocardial infarction (AMI), few studies have described national, real‐world trends in AMI care in the emergency department (ED). We aimed to describe trends in the epidemiology and quality of AMI care in US EDs over a recent 11‐year period, from 2005 to 2015. Methods and Results We conducted an observational study of ED visits for AMI using the National Hospital Ambulatory Medical Care Survey, a nationally representative probability sample of US EDs. AMI visits were classified as ST‐segment–elevation myocardial infarction (STEMI) and non‐STEMI. Outcomes included annual incidence of AMI, median ED length of stay, ED disposition type, and ED administration of evidence‐based medications. Annual ED visits for AMI decreased from 1 493 145 in 2005 to 581 924 in 2015. Estimated yearly incidence of ED visits for STEMI decreased from 1 402 768 to 315 813. The proportion of STEMI sent for immediate, same‐hospital catheterization increased from 12% to 37%. Among patients with STEMI sent directly for catheterization, median ED length of stay decreased from 62 to 37 minutes. ED administration of antithrombotic and nonaspirin antiplatelet agents rose for STEMI (23%–31% and 10%–27%, respectively). Conclusions National, real‐world trends in the epidemiology of AMI in the ED parallel those of clinical registries, with decreases in AMI incidence and STEMI proportion. ED care processes for STEMI mirror evolving guidelines that favor high‐intensity antiplatelet therapy, early invasive strategies, and regionalization of care.

scholarly journals Challenges in Bridge Health Monitoring: A Review

Sensors ◽  
2021 ◽  
Vol 21 (13) ◽  
pp. 4336
Author(s):  
Piervincenzo Rizzo ◽  
Alireza Enshaeian
Keyword(s):  
United States ◽  
Health Monitoring ◽  
Highway Bridges ◽  
The United States ◽  
Anomalous Behavior ◽  
Existing Structures ◽  
Bridge Health Monitoring ◽  
Using Data ◽  
The Many ◽  
Major Factors

Bridge health monitoring is increasingly relevant for the maintenance of existing structures or new structures with innovative concepts that require validation of design predictions. In the United States there are more than 600,000 highway bridges. Nearly half of them (46.4%) are rated as fair while about 1 out of 13 (7.6%) is rated in poor condition. As such, the United States is one of those countries in which bridge health monitoring systems are installed in order to complement conventional periodic nondestructive inspections. This paper reviews the challenges associated with bridge health monitoring related to the detection of specific bridge characteristics that may be indicators of anomalous behavior. The methods used to detect loss of stiffness, time-dependent and temperature-dependent deformations, fatigue, corrosion, and scour are discussed. Owing to the extent of the existing scientific literature, this review focuses on systems installed in U.S. bridges over the last 20 years. These are all major factors that contribute to long-term degradation of bridges. Issues related to wireless sensor drifts are discussed as well. The scope of the paper is to help newcomers, practitioners, and researchers at navigating the many methodologies that have been proposed and developed in order to identify damage using data collected from sensors installed in real structures.

Sign in / Sign up

Export Citation Format

Share Document