Comparison of Phosphorus Sorption by Light-Weight Aggregates Produced in the United States

Pedosphere ◽  
2014 ◽  
Vol 24 (6) ◽  
pp. 808-816 ◽  
Author(s):  
M.D. BAKER ◽  
S. SIMKINS ◽  
L.A. SPOKAS ◽  
P.L.M. VENEMAN ◽  
B.S. XING
Keyword(s):  
United States ◽  
The United States ◽  
Light Weight ◽  
Phosphorus Sorption

scholarly journals Taking the hydro out of hydrofracturing: Application of ultra-light weight proppants to cryogenic liquid nitrogen as a fracturing fluid

2018 ◽  
Vol 1 ◽  
pp. 57
Author(s):  
Amna Ahmed ◽  
Teresa Zhu ◽  
Amna Majeed
Keyword(s):  
United States ◽  
Liquid Nitrogen ◽  
The United States ◽  
Cryogenic Liquid ◽  
Gas Extraction ◽  
Light Weight ◽  
Stress Tests ◽  
Fracturing Fluids ◽  
Novel Approach ◽  
Waterless Fracturing

In the last decade, hydraulic fracturing has rapidly gained popularity worldwide, emerging as the leading method of natural gas extraction in the United States. However, the practice remains controversial due to its contribution to greenhouse gas emissions and the contamination of freshwater used in fracturing fluids. Although waterless fracturing fluids have been developed, including those using N2, CO2, oil, and alcohol, their application has been limited largely due to reduced fracturing power. Recent research has demonstrated that cryogenic nitrogen may prove a viable alternative, if this issue is properly addressed. Addition of durable, lightweight proppants is one way to increase fracturing power. This study aims to investigate the effect of proppant addition on the fracturing capabilities of cryogenic nitrogen. Three ultra-lightweight proppants will be combined with liquid nitrogen and fracturing power will be measured using triaxial stress tests. This novel approach has not yet been explored and will open more avenues of research into sustainable and efficient fracturing using  cryogenic nitrogen.

scholarly journals TFE1042: A New Low Bypass Ratio Engine

1990 ◽  
Author(s):  
A. R. Finkelstein
Keyword(s):  
United States ◽  
High Performance ◽  
Development Program ◽  
The United States ◽  
Light Weight ◽  
United States Military ◽  
Bypass Ratio

The TFE1042-70 is a modern low-bypass ratio afterburning military engine for light-weight fighters and high performance trainers. Designed, developed, and qualified in the 1980’s, it is intended to power the latest aircraft in the 1990’s and beyond. A version without the afterburner has been given the United States Military Engine designation of F124-GA-100. The engine is rugged, compact, durable, and easily maintained. It has been designed to meet the latest U. S. Military specification standards. This paper describes the engine and the development program.

Design/Development of a Stable U-10 Soccer Goal

2007 ◽  
Author(s):  
Christopher W. Ferrone
Keyword(s):  
United States ◽  
The United States ◽  
Light Weight ◽  
Design Development ◽  
Public Park ◽  
The People

All across the United States, all year round, children play with soccer goals. The average age of children who interact with goals ranges from 5 to 18 years of age; although many adults utilize soccer goals as well. In most instances the goal is located at a public park or school. This requires the goals to be moveable. The portability of the goal is to allow for storage, grounds keeping and game placement — to name a few. This requirement dictates that the goal be light weight enough to be moved by the people using it, or the entity which controls it. Therefore, an unrestrained, light-weight goal can easily become unstable and tip over. Many of these goals are unsafe because they are improperly designed, manufactured or installed (unstable and are either unanchored or not properly anchored or counter balanced). A U-10 soccer goal has been designed and built which is light weight, portable and is stable with or without anchors. This design is passive in nature. That is to say it is always working and does not rely on stakes or sandbags; however, stakes are part of this design.

Correlative microscopy in distrubuted (client/server) computing environments: tools for catalyzing the rapid dissemination of information about the cell biology of the human prostate

1995 ◽  
Vol 53 ◽  
pp. 682-683
Author(s):  
A. Hakam ◽  
J.T. Gau ◽  
M.L. Grove ◽  
B.A. Evans ◽  
M. Shuman ◽  
...  
Keyword(s):  
United States ◽  
Cell Biology ◽  
Tissue Bank ◽  
The United States ◽  
Prostate Adenocarcinoma ◽  
Correlative Microscopy ◽  
Client Server ◽  
Critical Elements ◽  
Transplant Organ

Prostate adenocarcinoma is the most common malignant tumor of men in the United States and is the third leading cause of death in men. Despite attempts at early detection, there will be 244,000 new cases and 44,000 deaths from the disease in the United States in 1995. Therapeutic progress against this disease is hindered by an incomplete understanding of prostate epithelial cell biology, the availability of human tissues for in vitro experimentation, slow dissemination of information between prostate cancer research teams and the increasing pressure to “ stretch” research dollars at the same time staff reductions are occurring.To meet these challenges, we have used the correlative microscopy (CM) and client/server (C/S) computing to increase productivity while decreasing costs. Critical elements of our program are as follows:1) Establishing the Western Pennsylvania Genitourinary (GU) Tissue Bank which includes >100 prostates from patients with prostate adenocarcinoma as well as >20 normal prostates from transplant organ donors.

Digital image acquisition, processing, and analysis in a polymer microscopy laboratory

1994 ◽  
Vol 52 ◽  
pp. 454-455
Author(s):  
Vinod K. Berry ◽  
Xiao Zhang
Keyword(s):  
United States ◽  
Image Analysis ◽  
Digital Image ◽  
Image Acquisition ◽  
Image Transmission ◽  
The United States ◽  
Quantitative Image Analysis ◽  
Quantitative Image

In recent years it became apparent that we needed to improve productivity and efficiency in the Microscopy Laboratories in GE Plastics. It was realized that digital image acquisition, archiving, processing, analysis, and transmission over a network would be the best way to achieve this goal. Also, the capabilities of quantitative image analysis, image transmission etc. available with this approach would help us to increase our efficiency. Although the advantages of digital image acquisition, processing, archiving, etc. have been described and are being practiced in many SEM, laboratories, they have not been generally applied in microscopy laboratories (TEM, Optical, SEM and others) and impact on increased productivity has not been yet exploited as well.In order to attain our objective we have acquired a SEMICAPS imaging workstation for each of the GE Plastic sites in the United States. We have integrated the workstation with the microscopes and their peripherals as shown in Figure 1.

Silence of the Land: On the Historical Irrelevance of Territory to Congressional Districting and Political Representation in the United States

2001 ◽  
Vol 15 (01) ◽  
pp. 53-87 ◽  
Author(s):  
Andrew Rehfeld
Keyword(s):  
United States ◽  
House Of Representatives ◽  
Political Representation ◽  
The United States ◽  
Representative Government ◽  
Congressional District ◽  
Congressional Districts ◽  
Communities Of Interest

Every ten years, the United States “constructs” itself politically. On a decennial basis, U.S. Congressional districts are quite literally drawn, physically constructing political representation in the House of Representatives on the basis of where one lives. Why does the United States do it this way? What justifies domicile as the sole criteria of constituency construction? These are the questions raised in this article. Contrary to many contemporary understandings of representation at the founding, I argue that there were no principled reasons for using domicile as the method of organizing for political representation. Even in 1787, the Congressional district was expected to be far too large to map onto existing communities of interest. Instead, territory should be understood as forming a habit of mind for the founders, even while it was necessary to achieve other democratic aims of representative government.

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