Y. K. Zhang Articles | Environmental XPRT

External exposure due to natural radioactivity in some household kits

Specific activities (Bq/kg and ppm) of naturally occurring radionuclides were measured for about 57 samples from some household kits. The maximum specific activity values were 76.12, 118.37 and 3340.6 Bq/kg for U-238, Th-232 and K-40, respectively. The external exposure rate (μR/h) and dose rate (nG/h) were calculated. The maximum mean annual effective dose due to U-238 from Chinese ceramic ...

Jun. 2, 2009

By Inderscience Publishers

Mind bomb-1 is essential for intraembryonic hematopoiesis in the aortic endothelium and the subaortic patches

Intraembryonic hematopoiesis occurs at two different sites, the floor of the aorta and subaortic patches (SAPs) of the para-aortic splanchnopleura (P-Sp)/aorta-gonad-mesonephros (AGM) region. Notch1 and RBP-j are critical for the specification of hematopoietic stem cells (HSCs) in Notch signal-receiving cells. However, the mechanism by which Notch signaling is triggered from the Notch ...

Aug. 1, 2008

By American Society for Microbiology (ASM)

Moment inequality and complete convergence of moving average processes under asymptotically linear negative quadrant dependence assumptions

Let {Y, Yi, -¥ < i < ¥} be a doubly infinite sequence of identically distributed and asymptotically linear negative quadrant dependence random variables, {ai, - ¥ < i < ¥} an absolutely summable sequence of real numbers. We are inspired by Wang et al. (Econometric Theory 18:119–139, 2002) and Salvadori (Stoch Environ Res Risk Assess 17:116–140, 2003). And Salvadori (Stoch Environ Res ...

Jul. 21, 2005

By Springer-Verlag GmbH

Influence of aeration and permeate flux on deposition of particulates on membrane surface

In microfiltration, a deposit of foulant tends to form on the membrane surface and this usually controls the performance of the filtration process. This paper discusses the influence of physical parameters such as aeration and permeates flux on migration and deposition of above micron particles on the membrane surface. Kaolin clay suspension of particle 3.7–8▒μm with mean particle diameter 4.1▒μm ...

Jan. 1, 1900

By IWA Publishing

Treatment of tannery wastewater in a hybrid biological reactor

A shaft-type hybrid bioreactor treated composite wastewater of a chrome tannery manufacturing 'wet-blue leather'. The sample was treated under suspended growth and then hybrid system with 20 g/L of 5 mm tyre tube beads in batch mode. The continuous study was made under suspended growth and hybrid system with 10-30 g/L of beads. The kinetic coefficients Ks, k, Y and k were 170.83 mg/L, 0.0397 h−1, ...

Oct. 17, 2008

By Inderscience Publishers

Effects of nitrogen and potassium on wear mechanisms in perennial ryegrass: II. anatomical, morphological, and physiological characteristics

Wear tolerance is important in sports turf, but the effects of nitrogen (N) and potassium (K) on wear mechanisms in perennial ryegrass (Lolium perenne L.) are unknown. The objective of this study was to evaluate wear mechanisms in response to N and K in this species. Field studies were conducted in 2006 and 2007 using five N levels (49, 147, 245, 343, and 441 kg ha–1 yr–1) in combination with ...

Dec. 30, 2009

By Soil Science Society of America (SSSA)

UW Researchers Reveal Secrets of Subsurface Water Storage

Overview In recent years, an intrepid team of University of Wyoming researchers conducted a multi-site project to explore subsurface hydrology in and around the Laramie Range and expand our understanding of this critical water source for the western U.S. Challenge In the semi-arid western United States, every drop of water counts, especially as a growing population and climate change stress ...

Feb. 11, 2020

By In-Situ, Inc.

Recovery Costs Less

Bal K. Kaul, Ajit Sapre and Lei Zhang, ExxonMobil Research and Engineering Co. and Daryl Musselman and Surajit Roy, Quest Air Technologies, describe a new low cost H2 recovery process. Hydrogen recovery from fuel gas and hydrogen containing purge gas streams in refinery and chemical processes offers many potential benefits including process uplift, reduced hydrogen costs, avoidance of H2 plant ...

Nov. 1, 2007

By Xebec Adsorption Inc.

Treatment of distillery anaerobic effluent in a hybrid biological reactor

The treatability of anaerobic effluent from a molasses-based distillery was studied in a shaft-type hybrid bioreactor under purely suspended growth and hybrid system containing 5 mm tyre-tube beads. The Ks, k, Y and k found as 111.29 mg/l, 0.026/h, 0.4607 and 0.0040/h respectively. The maximum COD removal was 51.7% at a loading rate of 5.250 kg d−1 m−3. The overall removal rate was 0.0431, ...

Jan. 29, 2008

By Inderscience Publishers

Architect Sinan's Kırkçeşme water supply system outside the city of Istanbul and city network

The city of Istanbul has important water system remnants from old civilizations among which water line systems begun with Byzantine period and continued during Ottoman era, including Kırkçeşme water supply system. The original gallery structure within the Kırkçeşme system has been altered with time at some places as a result of necessary planning ...

May 30, 2013

By IWA Publishing

Book Review: Fundamentals of Environmental Sampling and Analysis by Chunlong Zhang

Fundamentals of Environmental Sampling and Analysis, by Chunlong Zhang. New York, John Wiley and Sons, 2007. 436pp. ISBN 978-0-471-71097-4Keywords: book ...

Nov. 21, 2008

By Inderscience Publishers

Canarina DISPER Software · atmospheric dispersion model · algorithms 6

Canarina DISPER Software · atmospheric dispersion model 9.1 Point source emissions The model uses a steady-state Gaussian plume equation to model emissions from point sources, such as stacks. 9.1.1 The Gaussian Equation The model for stacks uses the steady-state Gaussian plume equation for a continuous elevated source. For each source, the origin of the stack coordinate ...

Nov. 13, 2011

By Canarina Environmental Software

Concentration, temporal variation, and sources of black carbon in the Mt. Everest region retrieved by real-time observation and simulation

Abstract. Based on the high-resolution measurement of black carbon (BC) at the Qomolangma (Mt. Everest) Station (QOMS, 28.36◦ N, 86.95◦ E, 4276 m a.s.l.) from 15 May 2015 to 31 May 2017, we investigated the seasonal and diurnal variations in BC and its potential source regions. Both monthly and daily mean BC concentrations reached the highest values in the pre-monsoon season and the ...

Sep. 6, 2018

By Droplet Measurement Technologies (DMT)

What is The Function of Micro Switch In Surveillance Camera?

Most people are of the opinion that micro switches can only be used in few devices and appliances. Such is not correct in any way as these switches are beginning to be one of the most commonly used items or components in devices. For instance, you will find them in alarm systems and automobiles where they have been installed to carry out some automated functions. They are indeed becoming an ...

Oct. 12, 2020

By Huizhou Unionwell Technology Co., Ltd

Canarina DISPER Software · air quality dispersion model · algorithms 3

Canarina DISPER Software · air quality dispersion model Symbol / Definition Ly= Initial plume length for Schulman-Scire downwash sources with enhanced lateral plume spread (m) Lb= Lesser of the building height and crosswind projected building width (m) _= Alongwind length of open pit source (m) P(x,y)= Profile adjustment factor (dimensionless) p= Wind speed power law profile ...

Nov. 12, 2011

By Canarina Environmental Software

Y-27632

Y-27632 is an ATP-competitive inhibitor of ROCK-I and ROCK-II, with Ki of 220 nM and 300 nM for ROCK-I and ROCK-II, respectively, which primes human induced pluripotent stem cells (hIPSCs) to selectively differentiate towards mesendodermal lineage via epithelial-mesenchymal transition-like modulation.MedChemExpress (MCE) offers a wide range of high quality research chemicals and biochemicals ...

Aug. 11, 2019

By MedChemExpress LLC (MCE)

Intrinsic kinetics for fixed bed bioreactor in hospital wastewater treatment

Variation in hospital wastewater (HWW) pollutants and differences with municipal wastewater (MWW), make the use of biokinetic coefficients obtained from activated sludge in the MWW treatment unprofitable for designing, modeling and evaluation of biological processes for HWW treatment. Since this study was conducted to evaluate the performance and biokinetic coefficients of a fixed bed ...

Aug. 26, 2016

By IWA Publishing

Understanding non-orthogonal sonic anemometers

Non-orthogonal sonic anemometers have been around for about twenty years. We define them as having three measurement axes inclined at an angle of 60 deg to the horizontal and intersecting at their midpoints to form a small sampling volume. The open aspect of the array was immediately appealing to users. There are several makes on the market and each solved the problem of holding the transducers ...

Oct. 12, 2019

By Applied Technologies, Inc. (ATI)

Overcoming the International Audit Challenge - Enhesa Experts reflect on their auditing experiences

As the trend of corporate expansion into new international territories shows no sign of slowing, Corporate Audit Programs must find efficient ways of embracing global complexity. Companies must address the challenge of building one standardized and consistent compliance system in face of different languages, cultures, perceptions, regulations and enforcement practices. This month, Enhesa ...

Apr. 21, 2011

By Enhesa - Global EHS & Product Compliance Assurance

Canarina DISPER Software · air pollution · algorithms 2

Software · air pollution · algorithms 2 Symbol / Definition Ly= Initial plume length for Schulman-Scire downwash sources with enhanced lateral plume spread (m) Lb= Lesser of the building height and crosswind projected building width (m) _= Alongwind length of open pit source (m) P(x,y)= Profile adjustment factor (dimensionless) p= Wind speed power law profile exponent ...

Nov. 10, 2011

By Canarina Environmental Software