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Topic Review
Watch System
A watch system, watch schedule, or watch bill is a method of assigning regular periods of work duty aboard ships and some other areas of employment. A watch system allows the ship's crew to operate the ship 24 hours a day for the duration of long voyages or operations. Many watch systems incorporate the concept of dogging, whereby one watch is split into two shorter watches so that there is an odd number each day. Doing so allows crew members to have a different watch schedule each day. Often, the dog watches are set at dinner time to allow the entire crew to be fed in short order.
  • 518
  • 12 Oct 2022
Topic Review
Wastewater Treatment by Catalytic Wet Peroxidation
Nowadays, there is an increasing interest in the development of promising, efficient, and environmentally friendly wastewater treatment technologies. Among them are the advanced oxidation processes (AOPs), in particular, catalytic wet peroxidation (CWPO), assisted or not by radiation. One of the challenges for the industrial application of this process is the development of stable and efficient catalysts, without leaching of the metal to the aqueous phase during the treatment. Gold catalysts, in particular, have attracted much attention from researchers because they show these characteristics. Recently, numerous studies have been reported in the literature regarding the preparation of gold catalysts supported on various supports and testing their catalytic performance in the treatment of real wastewaters or model pollutants by CWPO. This review summarizes this research; the properties of such catalysts and their expected effects on the overall efficiency of the CWPO process, together with a description of the effect of operational variables (such as pH, temperature, oxidant concentration, catalyst, and gold content). In addition, an overview is given of the main technical issues of this process aiming at its industrial application, namely the possibility of using the catalyst in continuous flow reactors. Such considerations will provide useful information for a faster and more effective analysis and optimization of the CWPO process.
  • 989
  • 14 May 2020
Topic Review
Wastewater
Wastewater is any water that has been contaminated by human use. Wastewater is "used water from any combination of domestic, industrial, commercial or agricultural activities, surface runoff or stormwater, and any sewer inflow or sewer infiltration". Therefore, wastewater is a byproduct of domestic, industrial, commercial or agricultural activities. The characteristics of wastewater vary depending on the source. Types of wastewater include: domestic wastewater from households, municipal wastewater from communities (also called sewage) and industrial wastewater. Wastewater can contain physical, chemical and biological pollutants. Households may produce wastewater from flush toilets, sinks, dishwashers, washing machines, bath tubs, and showers. Households that use dry toilets produce less wastewater than those that use flush toilets. Wastewater may be conveyed in a sanitary sewer that conveys only sewage. Alternatively, wastewater can be transported in a combined sewer that conveys both stormwater runoff and sewage, and possibly also industrial wastewater. After treatment at a wastewater treatment plant, treated wastewater (also called effluent) is discharged to a receiving water body. The terms "wastewater reuse" and "water reclamation" apply if the treated waste is used for another purpose. Wastewater that is discharged to the environment without suitable treatment can cause water pollution. In developing countries and in rural areas with low population densities, wastewater is often treated by various on-site sanitation systems and not conveyed in sewers. These systems include septic tanks connected to drain fields, on-site sewage systems (OSS), vermifilter systems and many more.
  • 1.4K
  • 19 Oct 2022
Topic Review
Waste Tires
Waste or Scrap tires, also known as End-of-Life Tires (ELT), are used rubber tires that because of their abrasion state ("tire wear") are not safe for public traffic. Waste tires can go into tire recycling or will be dumped, either in legal landfills or illegally; another portion may be pyrolysed to produce tire-derived fuel or heat energy.
  • 977
  • 09 Oct 2022
Topic Review
Washing Damage in E-Textiles
E-textiles, hybrid products that incorporate electronic functionality into textiles, often need to withstand washing procedures to ensure textile typical usability. Yet, the washability—which is essential for many e-textile applications like medical or sports due to hygiene requirements—is often still insufficient. The influence factors for washing damage in textile integrated electronics as well as common weak points are not extensively researched, which makes a targeted approach to improve washability in e-textiles difficult. 
  • 762
  • 25 May 2021
Biography
Warren F. (Pete) Miller Jr.
Warren Fletcher "Pete" Miller Jr. (born March 17, 1943[1]) is an American nuclear engineer known for his work in the areas of computational physics, radioactive waste management, transport theory, nuclear reactor design and analysis, and the management of nuclear research and development programs. Miller served as the Assistant Secretary of Energy for Nuclear Energy under Secretary of Energy St
  • 525
  • 15 Nov 2022
Topic Review
Warp-Field Experiments
Warp-field experiments are a series of current and proposed experiments to create and detect instances of spacetime warping. The ultimate goal is to prove or disprove the possibility of spacetime metric engineering with reasonable amounts of energy.
  • 693
  • 14 Oct 2022
Topic Review
Wapama (Steam Schooner)
Wapama, also known as Tongass, was a vessel last located in Richmond, California. She was the last surviving example of some 225 wooden steam schooners that served the lumber trade and other coastal services along the Pacific Coast of the United States . She was managed by the National Park Service at San Francisco Maritime National Historical Park until dismantled in August 2013. Wapama was designated a National Historic Landmark in 1984; the designation was withdrawn in 2015.
  • 260
  • 29 Nov 2022
Biography
Walter Riedel
Walter J H "Papa" Riedel ("Riedel I") was a German engineer who was the head of the Design Office of the Army Research Centre Peenemünde and the chief designer of the A4 (V-2) ballistic rocket.[1][2] The crater Riedel on the Moon was co-named for him and the German rocket pioneer Klaus Riedel. Employed by the Heylandt Company from 27 February 1928, in December 1929, Riedel was assigned respo
  • 410
  • 26 Dec 2022
Biography
Walt Havenstein
Walter Perry "Walt" Havenstein (born April 24, 1949)[1] is an American businessman, engineer, and former United States Marine. He was the Republican nominee for Governor of New Hampshire in 2014. Havenstein is the son of Kathryn McKay (Creech) and Paul Lieder Havenstein, CDR, USN.[2][3][4] He graduated from the United States Naval Academy with a bachelor's degree in aerospace engineering and
  • 482
  • 29 Dec 2022
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