Evaluation of Zerovalent Zinc for Treatment of 1,2,3‐Trichloropropane‐Contaminated Groundwater: Laboratory and Field Assessment     

Alexandra J. Salter‐Blanc  Eric J. Suchomel  John H. Fortuna  James T. Nurmi  Chris Walker  Tom Krug  Suzanne O'Hara  Nancy Ruiz  Theresa Morley  Paul G. Tratnyek 《Ground Water Monitoring & Remediation》2012,32(4):42-52

The efficacy and feasibility of using zerovalent zinc (ZVZ) to treat 1,2,3‐trichloropropane (TCP)‐contaminated groundwater was assessed in laboratory and field experiments. In the first portion of the study, the reactivity of commercially available granular ZVZ toward TCP was measured in bench‐scale batch‐reactor and column experiments. These results were used to design columns for on‐site pilot‐scale treatment of contaminated groundwater at a site in Southern California. Two of the ZVZ materials tested were found to produce relatively high rates of TCP degradation as well as predictable behavior when scaling from bench‐scale to field testing. In addition, there was little decrease in the rates of TCP degradation over the duration of field testing. Finally, no secondary impacts to water quality were identified. The results suggest that ZVZ may be an effective and feasible material for use in engineered treatment systems, perhaps including permeable reactive barriers.  相似文献   

A bibliometric-based evaluation on environmental research in the Arab world     

SH. H. Zyoud  D. Fuchs-Hanusch  S. H. Zyoud  A. E. Al-Rawajfeh  H. Q. Shaheen 《International Journal of Environmental Science and Technology》2017,14(4):689-706

The Arab world’s environment is among the most vulnerable and harsh ones across the globe. This entails much efforts to mitigate the potential environmental risks. Analysing contributions of Arab scholars in environmental research in terms of quantity and quality can bring up insights on their endeavours in this regard. Bibliometric techniques are proposed to conduct such this analysis over publications originated from Arab world in a leading environmental journal “Science of the Total Environment”. Research productivity is being used as quantitative indicator, while citation rates and Hirsch index (h-index) are being used as qualitative indicators. The research outputs were compared with those obtained from non-Arab Middle Eastern countries (Iran, Turkey and Israel). Worldwide research productivity was 17,258 documents, while that from Arab countries, Iran, Turkey and Israel were 215, 34, 83 and 87 documents, respectively. The h-index of Arab world research was 31, and total citations were 3616 with an average of 16.8. The highest share of publications was recorded by Saudi Arabia (53 documents; 24.7%). Egypt and Saudi Arabia had highest h-index with 15 for each one. American University of Beirut in Lebanon was the highest productive institution (16; 7.4%). The most collaborated country with Arab world was France (29; 13.5%). In the conclusion, the study reveals a clear gap in terms of research productivity between Arab countries and other Middle Eastern countries, precisely Israel and Turkey. More research efforts through optimizing investments in environmental research, developing regional experiences and fostering international collaboration are required to eliminate these lags.  相似文献   

New set of geometrical and physical elements of the two variable stars SW lacertae and OO aquilae     

Hamid M.K. Al-Naimiy  Tawfiq H.SH. Al-Masharfeh 《Astrophysics and Space Science》2000,273(1-4):83-93

Photoelectric observations of the two eclipsingvariables, were obtained in UBV standard system, for SWLac and, inVB standard system for OOAql.A new set of geometrical and physical elements for thesystems were obtained from both minima, through theirmagnitude variation during the observation time using themethod of: Fourier Analysis Techniques in-Frequency-domain for thelight curve changes. The two eclipsing variables are contact, the firstcontact angle was 48.1^° for SW Lac and 47.7^° for OO Aql.Absolute elements and effective temperatures of the twocomponents for both systems are derived.  相似文献   

The photometric observations and analysis of the eclipsing binar V566 Ophiuchi     

M.T. Edalati  SH. Shaarife 《Astrophysics and Space Science》2004,289(1-2):169-176

The system of V566 Oph was observed photometrically in B and V filters in1999 at the Birouni Observatory, Shiraz, Iran. Two light curves were obtained and have been analyzed separately of Wilson-Devinney code. New geometrical and physical elements for the system are given. The absolute dimensions of the binary have been derived by combining the photometric solution with spectroscopic data of the system. Also, the period of the system is calculated.  相似文献   

On the superficial deposits of central and parts of Southern England     

A.E. Salter 《Proceedings of the Geologists' Association. Geologists' Association》1905,19(1):1-56

  相似文献   

Celestial bodies and multidimensional Einstein theory of gravitation     

U. Bleyer  L. SH. Grigorian 《Astrophysics and Space Science》1995,225(1):123-135

Static spherically symmetric celestial bodies are investigated in multidimensional Einstein theory of gravitation. A model with compact Ricci-flat internal space ⁿ is studied and confronted with observations. Integration constants in the exterior solution of field equations are determined using integrals over the distribution of matter inside the celestial body. Two independent formulas for the mass and mass squared of the celestial body are derived. The first one is similar to Tolman's formula for the mass in GRT. It is shown that integral parameters (mass, radius etc.) of the matter distribution inside the celestial body tend to definite limits in the case of large number (n ) of extra dimensions.As main result it turns out that the model would be in accordance with solar system observational data only if there would be a negative (with abnormal large absolute value) pressurep ₁ of solar matter in extra dimensions: |p ₁| c ², where is the matter density.This work was supported by grant WIP-016659.This work was supported by DFG grant 436 ARM - 17/10/93.  相似文献   

Excursion to the Laindon Hills,Essex: July 13th, 1907     

A.E. Salter  T.W. Reader 《Proceedings of the Geologists' Association. Geologists' Association》1907,20(3):181-183

  相似文献   

Compact steep-spectrum sources from the S4 sample     

D. J. Saikia  S. Jeyakumar  C. J. Salter  P. Thomasson  R. E. Spencer  F. Mantovani 《Monthly notices of the Royal Astronomical Society》2001,321(1):37-43

We present the results of 5-GHz observations with the VLA A-array of a sample of candidate compact steep‐spectrum (CSS) sources selected from the S4 survey. We also estimate the symmetry parameters of high-luminosity CSS sources selected from different samples of radio sources, and compare these with the larger sources of similar luminosity to understand their evolution and the consistency of the CSS sources with the unified scheme for radio galaxies and quasars. The majority of CSS sources are likely to be young sources advancing outwards through a dense asymmetric environment. The radio properties of CSS sources are found to be consistent with the unified scheme, in which the axes of the quasars are observed close to the line of sight, while radio galaxies are observed close to the plane of the sky.  相似文献