Rapid UV-radiation synthesis of polyacrylate cryogel oil-sorbents with adaptable structure and performance

2020 ◽  
Vol 187 ◽  
pp. 109488
Author(s):  
Abdul Haleem ◽  
Hui-Juan Li ◽  
Peng-Yun Li ◽  
Chuan-Shan Hu ◽  
Xi-Chuan Li ◽  
...  
Keyword(s):  
Uv Radiation ◽  
Radiation Synthesis ◽  
Oil Sorbents ◽  
And Performance

Synthesis and performance of different polyurethane foams as oil sorbents

2017 ◽  
Vol 134 (41) ◽  
pp. 45409 ◽  
Author(s):  
O. S. H. Santos ◽  
M. Coelho da Silva ◽  
M. I. Yoshida
Keyword(s):  
Polyurethane Foams ◽  
Oil Sorbents ◽  
And Performance

scholarly journals An ultraviolet simulator for the incident Martian surface radiation and its applications

2005 ◽  
Vol 4 (3-4) ◽  
pp. 241-249 ◽  
Author(s):  
C. Kolb ◽  
R. Abart ◽  
A. Bérces ◽  
J.R.C. Garry ◽  
A.A. Hansen ◽  
...  
Keyword(s):  
Organic Matter ◽  
Uv Radiation ◽  
Genetic Material ◽  
Radiation Energy ◽  
Photochemical Reactions ◽  
Surface Radiation ◽  
Minor Role ◽  
Martian Surface ◽  
Pyrimidine Dimers ◽  
And Performance

Ultraviolet (UV) radiation can act on putative organic/biological matter at the Martian surface in several ways. Only absorbed, but not transmitted or reflected, radiation energy can be photo-chemically effective. The most important biological UV effects are due to photochemical reactions in nucleic acids, DNA or RNA, which constitute the genetic material of all cellular organisms and viruses. Protein or lipid effects generally play a minor role, but they are also relevant in some cases. UV radiation can induce wavelengths-specific types of DNA damage. At the same time it can also induce the photo-reversion reaction of a UV induced DNA photoproduct of nucleic acid bases, the pyrimidine dimers. Intense UVB and UVC radiation, experienced on early Earth and present-day Mars, has been revealed to be harmful to all organisms, including extremophile bacteria and spores. Moreover, the formation of oxidants, catalytically produced in the Martian environment through UV irradiation, may be responsible for the destruction of organic matter on Mars. Following this, more laboratory simulations are vital in order to investigate and understand UV effects on organic matter in the case of Mars. We have designed a radiation apparatus that simulates the anticipated Martian UV surface spectrum between 200 and 400 nm (UVC–UVA). The system comprises a UV enhanced xenon arc lamp, special filter-sets and mirrors to simulate the effects of the Martian atmospheric column and dust loading. We describe the technical setup and performance of the system and discuss its uses for different applications. The design is focused on portability, therefore, the Mars-UV simulator represents a device for several different Mars simulation facilities with specific emphasis on Mars research topics.

Carbon materials as oil sorbents: a review on the synthesis and performance

2016 ◽  
Vol 4 (5) ◽  
pp. 1550-1565 ◽  
Author(s):  
Shivam Gupta ◽  
Nyan-Hwa Tai
Keyword(s):  
Oil Spill ◽  
Carbon Materials ◽  
Environmental System ◽  
System P ◽  
The World ◽  
Oil Sorbents ◽  
And Performance ◽  
Spilled Oil

Oil spill accidents have urged scientists across the world to develop an immediate cleanup technology because the spilled oil significantly affects the ecological and environmental system.

Evaluation of reflection and refraction in simulations of ultraviolet disinfection using the discrete ordinates radiation model

2009 ◽  
Vol 59 (12) ◽  
pp. 2421-2428 ◽  
Author(s):  
C. K. Ho
Keyword(s):  
Radiation Field ◽  
Uv Radiation ◽  
Incident Radiation ◽  
Discrete Ordinates ◽  
Radiation Model ◽  
Reflection And Refraction ◽  
The Difference ◽  
Uv Lamp ◽  
And Performance ◽  
The Impact

Simulations of UV disinfection systems require accurate models of UV radiation within the reactor. Processes such as reflection and refraction at surfaces within the reactor can impact the intensity of the simulated radiation field, which in turn impacts the simulated dose and performance of the UV reactor. This paper describes a detailed discrete ordinates radiation model and comparisons to a test that recorded the UV radiation distribution around a low pressure UV lamp in a water-filled chamber with a UV transmittance of 88%. The effects of reflection and refraction at the quartz sleeve were investigated, along with the impact of wall reflection from the interior surfaces of the chamber. Results showed that the inclusion of wall reflection improved matches between predicted and measured values of incident radiation throughout the chamber. The difference between simulations with and without reflection ranged from several percent near the lamp to nearly 40% further away from the lamp. Neglecting reflection and refraction at the quartz sleeve increased the simulated radiation near the lamp and reduced the simulated radiation further away from the lamp. However, the distribution and trends in the simulated radiation field both with and without the effects of reflection and refraction at the quartz sleeve were consistent with the measured data distributions.

Radiation synthesis and performance of novel cellulose-based microsphere adsorbents for efficient removal of boron (III)

2017 ◽  
Vol 174 ◽  
pp. 273-281 ◽  
Author(s):  
Siqi Liu ◽  
Min Xu ◽  
Tianlin Yu ◽  
Dong Han ◽  
Jing Peng ◽  
...  
Keyword(s):  
Efficient Removal ◽  
Radiation Synthesis ◽  
And Performance

Transmission Scanning Electron Microscopy and Energy Analysis with the Siemens ELMISKOP 101

1972 ◽  
Vol 30 ◽  
pp. 450-451
Author(s):  
H. M. Thieringer
Keyword(s):  
Objective Lens ◽  
Transmission Microscopy ◽  
Image Recording ◽  
Mode Of Operation ◽  
Scanning Transmission ◽  
Electron Microscopes ◽  
And Performance ◽  
Convergent Beam ◽  
Ray Path ◽  
Beam Diffraction

It has repeatedly been show that with conventional electron microscopes very fine electron probes can be produced, therefore allowing various micro-techniques such as micro recording, X-ray microanalysis and convergent beam diffraction. In this paper the function and performance of an SIEMENS ELMISKOP 101 used as a scanning transmission microscope (STEM) is described. This mode of operation has some advantages over the conventional transmission microscopy (CTEM) especially for the observation of thick specimen, in spite of somewhat longer image recording times.Fig.1 shows schematically the ray path and the additional electronics of an ELMISKOP 101 working as a STEM. With a point-cathode, and using condensor I and the objective lens as a demagnifying system, an electron probe with a half-width ob about 25 Å and a typical current of 5.10-11 amp at 100 kV can be obtained in the back focal plane of the objective lens.

Neutrophil Myeloperoxidase Destruction by Ultraviolet Irradiation

1988 ◽  
Vol 46 ◽  
pp. 138-139
Author(s):  
J. Hanker ◽  
B. Giammara ◽  
G. Strauss
Keyword(s):  
Uv Radiation ◽  
Myeloid Leukemia ◽  
Stratospheric Ozone ◽  
Psoriasis Patient ◽  
Whole Body ◽  
Human Neutrophils ◽  
Cupric Nitrate ◽  
The Earth ◽  
Routine Handling ◽  
Uvb Phototherapy

Only a fraction of the UV radiation emitted by the sun reaches the earth; most of the UVB (290-320nm) is eliminated by stratospheric ozone. There is increasing concern, however, that man-made chemicals are damaging this ozone layer. Although the effects of UV on DNA or as a carcinogen are widely known, preleukemia and acute myeloid leukemia (AML) have only rarely been reported in psoriasis patients treated with 8-methoxypsoralen and UV (PUVA). It was therefore of interest to study the effects of UV on the myeloperoxidase (MP) activity of human neutrophils. The peroxidase activity of enriched leukocyte preparations on coverslips was shown cytochemically with a diaminobenzidine medium and cupric nitrate intensification.Control samples (Figs. 1,4,5) of human bloods that were not specifically exposed to UV radiation or light except during routine handling were compared with samples which had been exposed in one of several different ways. One preparation (Fig. 2) was from a psoriasis patient who had received whole-body UVB phototherapy repeatedly.

Angular Resolved Electron Spectroscopy with Parallel Recording

1990 ◽  
Vol 48 (2) ◽  
pp. 370-371
Author(s):  
Huang Min ◽  
P.S. Flora ◽  
C.J. Harland ◽  
J.A. Venables
Keyword(s):  
Electron Spectroscopy ◽  
Low Voltage ◽  
Solid Angle ◽  
Detection System ◽  
Voltage Electron ◽  
Cylindrical Mirror ◽  
Inner Radius ◽  
Channel Plate ◽  
And Performance ◽  
Type Detector

A cylindrical mirror analyser (CMA) has been built with a parallel recording detection system. It is being used for angular resolved electron spectroscopy (ARES) within a SEM. The CMA has been optimised for imaging applications; the inner cylinder contains a magnetically focused and scanned, 30kV, SEM electron-optical column. The CMA has a large inner radius (50.8mm) and a large collection solid angle (Ω > 1sterad). An energy resolution (ΔE/E) of 1-2% has been achieved. The design and performance of the combination SEM/CMA instrument has been described previously and the CMA and detector system has been used for low voltage electron spectroscopy. Here we discuss the use of the CMA for ARES and present some preliminary results.The CMA has been designed for an axis-to-ring focus and uses an annular type detector. This detector consists of a channel-plate/YAG/mirror assembly which is optically coupled to either a photomultiplier for spectroscopy or a TV camera for parallel detection.

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