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Sample records for actf

  1. Breakthrough curves of oil adsorption on novel amorphous carbon thin film.

    El-Sayed, M; Ramzi, M; Hosny, R; Fathy, M; Abdel Moghny, Th

    2016-01-01

    A novel amorphous carbon thin film (ACTF) was prepared by hydrolyzing wood sawdust and delignificating the residue to obtain cellulose mass that was subjected to react with cobalt silicate nanoparticle as a catalyst under the influence of sudden concentrated sulfuric acid addition at 23 °C. The novel ACTF was obtained in the form of thin films like graphene sheets having winding surface. The prepared ACTF was characterized by Fourier-transform infrared spectrometer, transmission electron microscope (TEM), and Brunauer-Emmett-Teller (BET). The adsorption capacity of ACTF to remove oil from synthetic produced water was evaluated using the incorporation of Thomas and Yoon-Nelson models. The performance study is described through the breakthrough curves concept under relevant operating conditions such as column bed heights (3.8, 5 and 11 mm) and flow rate (0.5, 1 and 1.5 mL.min(-1)). It was found that the oil uptake mechanism is favoring higher bed height. Also, the highest bed capacity of 700 mg oil/g ACTF was achieved at 5 mm bed height, and 0.5 mL.min(-1) flow rate. The results of breakthrough curve for oil adsorption was best described using the Yoon-Nelson model. Finally, the results illustrate that ACTF could be utilized effectively for oil removal from synthetic produced water in a fixed-bed column system. PMID:27191556

  2. Amenability of low-grade uranium towards column bioleaching by acidithiobacillus ferrooxidans

    R and D studies were carried out at NML using Acidithiobacillus ferrooxidans (Ac.Tf) in column for the bio-recovery of uranium from the low-grade uranium ore containing 0.024% U3O8 of Turamdih mines, Singhbhum. A recovery of 55.48% uranium was obtained in bio-leaching as against ∼ 44.9% in sterile control in 30 days at 1.7 pH in a column containing 2.5kg ore of particle size mainly in the range 5-1mm. In the large scale column, leaching with 80kg ore of particle size ∼ 0.5cm, uranium bio-recovery was found to be 69.8% in comparison to a recovery of 55% in control set at 1.7 pH in 50 days. The uranium recoveries followed indirect leaching mechanism. (author)

  3. Dicty_cDB: Contig-U16587-1 [Dicty_cDB

    Full Text Available :none) Shewanella frigidimarina NCIMB ... 135 4e-30 CP000472_109( CP000472 |pid:none) Shewanella piezotolera...ssa cDNA - 1 hour He... 48 1.3 1 ( EY388804 ) CAXA7502.rev CAXA Helobdella robusta Subtracted ...L... 48 1.3 1 ( EY372846 ) CAXA14231.rev CAXA Helobdella robusta Subtracted ... 48 1.3 1 ( EY357254 ) CAWZ4802.fwd CAWZ Helobdella... 46 5.3 1 ( FE234358 ) CAPG2779.rev CAPG Naegleria gruberi amoeba stage ... 46 5.3 1 ( EY366075 ) CAXA1054.rev CAXA Helobdella...ACTF091692C23 POSSUM_01-POSSUM-C-REPROTRAC... 44 8.5 2 ( EY375669 ) CAXA1575.fwd CAXA Helobdella robusta Subtra

  4. Very high field magnetization and AC susceptibility of native horse spleen ferritin

    Guertin, R.P. [Department of Physics and Astronomy, Room 201, Science and Technology Center, Tufts University, Medford, MA 02155 (United States)]. E-mail: robert.guertin@tufts.edu; Harrison, N. [National High Magnetic Field Laboratory, Los Alamos National Laboratory, Los Alamos, NM 87545 (United States); Zhou, Z.X. [MS6056, Oak Ridge National Laboratory, Oak Ridge, TN 37830 (United States); McCall, S. [Lawrence Livermore National Laboratory, PO Box 808, Livermore, CA 94551 (United States); Drymiotis, F. [Department of Physics and Astronomy, Clemson University, Clemson, SC 29634 (United States)

    2007-01-15

    The magnetization of native horse spleen ferritin protein is measured in pulsed magnetic fields to 55 T at T=1.52 K. The magnetization rises smoothly with negative curvature due to uncompensated Fe{sup 3+} spins and with a large high field slope due to the underlying antiferromagnetic ferritin core. Even at highest fields the magnetic moment is only {approx}4% of the saturation moment of the full complement of Fe{sup 3+} in the ferritin molecule. The AC magnetic susceptibility, {chi} {sub AC}(T,f), responding to the uncompensated spins, reaches a maximum near the superparamagnetic blocking temperature with the temperature of the maximum, T {sub M}, varying with excitation frequency, T {sub M} {sup -1} {alpha} log f for 10{<=}f{<=}10{sup 4} Hz.

  5. ADVANCED CUTTINGS TRANSPORT STUDY

    Stefan Miska; Nicholas Takach; Kaveh Ashenayi; Mengjiao Yu; Ramadan Ahmed; Mark Pickell; Len Volk; Lei Zhou; Zhu Chen; Aimee Washington; Crystal Redden

    2003-09-30

    The Quarter began with installing the new drill pipe, hooking up the new hydraulic power unit, completing the pipe rotation system (Task 4 has been completed), and making the SWACO choke operational. Detailed design and procurement work is proceeding on a system to elevate the drill-string section. The prototype Foam Generator Cell has been completed by Temco and delivered. Work is currently underway to calibrate the system. Literature review and preliminary model development for cuttings transportation with polymer foam under EPET conditions are in progress. Preparations for preliminary cuttings transport experiments with polymer foam have been completed. Two nuclear densitometers were re-calibrated. Drill pipe rotation system was tested up to 250 RPM. Water flow tests were conducted while rotating the drill pipe up to 100 RPM. The accuracy of weight measurements for cuttings in the annulus was evaluated. Additional modifications of the cuttings collection system are being considered in order to obtain the desired accurate measurement of cuttings weight in the annular test section. Cutting transport experiments with aerated fluids are being conducted at EPET, and analyses of the collected data are in progress. The printed circuit board is functioning with acceptable noise level to measure cuttings concentration at static condition using ultrasonic method. We were able to conduct several tests using a standard low pass filter to eliminate high frequency noise. We tested to verify that we can distinguish between different depths of sand in a static bed of sand. We tested with water, air and a mix of the two mediums. Major modifications to the DTF have almost been completed. A stop-flow cell is being designed for the DTF, the ACTF and Foam Generator/Viscometer which will allow us to capture bubble images without the need for ultra fast shutter speeds or microsecond flash system.

  6. ADVANCED CUTTINGS TRANSPORT STUDY

    Stefan Miska; Nicholas Takach; Kaveh Ashenayi

    2004-07-31

    section was put into liquid holdup mode. Readings indicated 2.5 to 2.7 inches of sand. The corresponding nuclear densitometers readings were between 2.5 and 3.1 inches. Lab tests were conducted to check an on-line viewing system. Sharp images were obtained through a CCD camera with the use of a ring light or fiber light. A prototype device for measuring the average bubble size for the foam generator-viscometer was constructed from a 1/2 inch fitting. The new windowed cell has been received and installed on the ACTF Bubble Characterization Cart.

  7. ADVANCED CUTTINGS TRANSPORT STUDY

    Troy Reed; Stefan Miska; Nicholas Takach; Kaveh Ashenayi; Mark Pickell; Len Volk; Mike Volk; Lei Zhou; Zhu Chen; Crystal Redden; Aimee Washington

    2003-04-30

    Experiments on the flow loop are continuing. Improvements to the software for data acquisition are being made as additional experience with three-phase flow is gained. Modifications are being made to the Cuttings Injection System in order to improve control and the precision of cuttings injection. The design details for a drill-pipe Rotation System have been completed. A US Patent was filed on October 28, 2002 for a new design for an instrument that can generate a variety of foams under elevated pressures and temperatures and then transfer the test foam to a viscometer for measurements of viscosity. Theoretical analyses of cuttings transport phenomena based on a layered model is under development. Calibrations of two nuclear densitometers have been completed. Baseline tests have been run to determine wall roughness in the 4 different tests sections (i.e. 2-in, 3-in, 4-in pipes and 5.76-in by 3.5-in annulus) of the flow loop. Tests have also been conducted with aerated fluids at EPET conditions. Preliminary experiments on the two candidate aqueous foam formulations were conducted which included rheological tests of the base fluid and foam stability reports. These were conducted after acceptance of the proposal on the Study of Cuttings Transport with Foam Under Elevated Pressure and Elevated Temperature Conditions. Preparation of a test matrix for cuttings-transport experiments with foam in the ACTF is also under way. A controller for instrumentation to measure cuttings concentration and distribution has been designed that can control four transceivers at a time. A prototype of the control circuit board was built and tested. Tests showed that there was a problem with radiated noise. AN improved circuit board was designed and sent to an external expert to verify the new design. The new board is being fabricated and will first be tested with static water and gravel in an annulus at elevated temperatures. A series of viscometer tests to measure foam properties have