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Two-hole structure outsideNi78: Existence of aμsisomer ofCo76andβdecay intoNi76
Sö,derströ,m, P.-A.,Nishimura, S.,Xu, Z. Y.,Sieja, K.,Werner, V.,Doornenbal, P.,Lorusso, G.,Browne, F.,Gey, G.,Jung, H. S.,Sumikama, T.,Taprogge, J.,Vajta, Zs.,Watanabe, H.,Wu, J.,Baba, H.,Dom American Physical Society 2015 PHYSICAL REVIEW C - Vol.92 No.5
Upward gas–liquid two-phase flow after a U-bend in a large-diameter serpentine pipe
Aliyu, Aliyu M.,Almabrok, Almabrok A.,Baba, Yahaya D.,Lao, Liyun,Yeung, Hoi,Kim, Kyung Chun Elsevier 2017 INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER - Vol.108 No.1
<P><B>Abstract</B></P> <P>We present an experimental study on the flow behaviour of gas and liquid in the upward section of a vertical pipe system with an internal diameter of 101.6mm and a serpentine geometry. The experimental matrix consists of superficial gas and liquid velocities in ranges of 0.15–30m/s and from 0.07 to 1.5m/s, respectively, which cover bubbly to annular flow. The effects on the flow behaviours downstream of the 180° return bend are significantly reduced when the flow reaches an axial distance of 47 pipe diameters from the U-bend. Therefore, reasonably developed flow is attained at this development length downstream of the bend. Other published measurements for large-diameter film thickness show similar trends with respect to the superficial gas velocity. However, the trends differ from those of small-diameter pipes, with which the film thickness decreases much faster with increasing gas flow. As a result, only a few of the published correlations for small pipe data agreed with the experimental data for large pipe film thickness. We therefore modified one of the best-performing correlations, which produced a better fit. Qualitative and statistical analyses show that the new correlation provides improved predictions for two-phase flow film thickness in large-diameter pipes.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Gas–liquid flow experiments performed in a large diameter serpentine flow loop. </LI> <LI> Flow visualisation done using a wire mesh sensor to identify upward flow regimes. </LI> <LI> Conductance probes were used to measure film thickness in the annular regime. </LI> <LI> Asymmetrical films after a U-bend became symmetrical at middle and top positions. </LI> <LI> Improved film thickness correlation was developed and compared with existing ones. </LI> </UL> </P>
A Health and Safety Improvement Roadmap for the Construction Industry
Diugwu, Ikechukwu A.,Baba, Dorothy L. Korea Institute of Construction Engineering and Ma 2014 Journal of construction engineering and project ma Vol.4 No.1
Comparatively, the construction industry has, on average, a higher rate of fatal and major injuries, work induced ill-health and damage to properties than other industrial sectors; and this is a source of concern to industry stakeholders. The study showed that although subcontracting could be contributory to an increase in workplace accidents in the construction industry, contractual aspects of subcontracting arrangements (such as the power imbalance that exist along the client-customer interface) also present opportunities for improvements in health and safety management (HSM) practices in organisations. This conclusion was reached after an analysis of a questionnaire survey (with a 27% response rate) that assessed the attitudes and perception to health and safety issues.
Baba, Shahid M,Azad, Niyaz A,Shah, Zaffar A,Afroze, Dil,Pandith, Arshad A,Jan, Aleem,Aziz, Sheikh A,Dar, Fayaz A Asian Pacific Journal of Cancer Prevention 2016 Asian Pacific journal of cancer prevention Vol.17 No.4
Background: Acute promyelocytic leukemia (APML) is characterized by the reciprocal translocation t(15;17) (p22;p12) resulting in the PML-$RAR{\alpha}$ fusion gene. A dual diagnostic and follow up approach was applied including cytogenetic demonstration of the t(15;17) translocation and detection dg PML-$RAR{\alpha}$ chimeric transcripts by molecular means. Purpose: Conventional cytogenetics involving bone marrow is beset with high probability of poor metaphase index and was substituted with phytohemagglutinin (PHA)-induced peripheral blood culture based cytogenetic analysis as a diagnostic & follow up modality in APML patients of Kashmir (North India). Both qualitative (RT-PCR) and quantitative (Q-PCR) tests were simultaneously carried out to authenticte the modified cytogenetics. Materials and Method: Patient samples were subjected to the said techniques to establish their baseline as well as follow-up status. Results: Initial cytogenetics revealed 30 patients (81%) Positive for t(15;17) whereas 7 (19%) had either cryptic translocation or were negative for t(15;17). Two cases had chromosome 16q deletion and no hallmark translocation t(15;17). Q-PCR status for PML-$RAR{\alpha}$ was found to be positive for all patients. All the APML patients were reassessed at the end of consolidation phase and during maintenance phase of chemotherapy where 6 patients had molecular relapse, wherein 4 also demonstrated cytogenetic relapse. Conclusions: It was found that PHA-induced peripheral blood cytogenetics along with molecular analysis could prove a reliable modality in the diagnosis and assessment of follow up response of APML patients.
Observation of a γ-decaying millisecond isomeric state in <sup>128</sup>Cd<sub>80</sub>
Jungclaus, A.,Grawe, H.,Nishimura, S.,Doornenbal, P.,Lorusso, G.,Simpson, G.S.,Soderstrom, P.A.,Sumikama, T.,Taprogge, J.,Xu, Z.Y.,Baba, H.,Browne, F.,Fukuda, N.,Gernhauser, R.,Gey, G.,Inabe, N.,Isobe North-Holland Pub. Co 2017 Physics letters. Section B Vol.772 No.-
A new high-spin isomer in the neutron-rich nucleus <SUP>128</SUP>Cd was populated in the projectile fission of a <SUP>238</SUP>U beam at the Radioactive Isotope Beam Factory at RIKEN. A half-life of T<SUB>½</SUB>=6.3(8) ms was measured for the new state which was tentatively assigned a spin/parity of (15<SUP>-</SUP>). The experimental results are compared to shell model calculations performed using state-of-the-art realistic effective interactions and to the neighbouring nucleus <SUP>129</SUP>Cd. In the present experiment no evidence was found for the decay of a 18<SUP>+</SUP>E6 spin-trap isomer, based on the complete alignment of the two-neutron and two-proton holes in the 0h<SUB>1½</SUB> and the 0g<SUB>9/2</SUB> orbit, respectively, which is predicted to exist by the shell model.
Jungclaus, A.,Gargano, A.,Grawe, H.,Taprogge, J.,Nishimura, S.,Doornenbal, P.,Lorusso, G.,Shimizu, Y.,Simpson, G. S.,Sö,derströ,m, P.-A.,Sumikama, T.,Xu, Z. Y.,Baba, H.,Browne, F.,Fukuda, N.,G American Physical Society 2016 Physical Review C Vol.93 No.4
<P>For the first time, the gamma decay of excited states has been observed in a nucleus situated in the quadrant south-east of doubly magic Sn-132, a region in which experimental information so far is limited to ground-state properties. Six gamma rays with energies of 50, 86, 103, 227, 357, and 602 keV were observed following the beta-delayed neutron emission from Cd-133(85), populated in the projectile fission of a U-238 beam at the Radioactive Isotope Beam Factory at RIKEN within the EURICA project. The new experimental information is compared to the results of a modern realistic shell-model calculation, the first one in this region very far from stability, focusing in particular on the pi 0g(9/2)(-1) circle times nu 1f(7/2) particle-hole multiplet in In-132(83). In addition, theoretical estimates based on a scaling of the two-body matrix elements for the pi h(11/2)(-1) circle times nu g(9/2) analog multiplet in Tl-208(127), one major proton and one major neutron shell above, are presented.</P>
Prediction of entrained droplet fraction in co-current annular gas-liquid flow in vertical pipes
Aliyu, A.M.,Almabrok, A.A.,Baba, Y.D.,Archibong, A.E.,Lao, L.,Yeung, H.,Kim, K.C. Elsevier 2017 Experimental thermal and fluid science Vol.85 No.-
<P>The entrained droplet fraction is an important parameter in annular two-phase flow, as its correlations are key inputs in flow simulation codes for the prediction of pressure drop and critical heat flux or dryout. Investigators have stressed the importance of extending the validity range of current correlations so that more conditions are covered. This could be achieved for example by including fluids with higher viscosities, a wider range of operating pressures, and increase in the size of pipes used for experiments (most of the data in the literature are from pipes of 50 mm diameter and below). In attempt to improve the latter, experiments were conducted in a 101.6 mm gas liquid flow loop at Cranfield University's Oil and Gas Engineering Laboratory and data on the fraction of droplets were collected in the annular flow regime by measuring the film velocity, from which the droplet fraction was calculated. Comparison of the film velocity by this method and by a mass balance showed close agreement. A capacitance Wire Mesh Sensor was used for flow visualisation in order to distinguish between annular and churn flow. In order to arrive at an improved correlation, over 1300 data points were gathered from other published works. These include air water studies where large pipes of up to 127 mm in diameter were used. The others were from small-diameter pipes and for refrigerant, steam water, air water, and air glycerine flows. Since in the annular regime, the gas flow entrains liquid droplets into the core, their presence alters the properties of the gas core. Therefore, accurate predictions are pivotal for the energy efficient design and operation of facilities in the petroleum and nuclear power industry. The correlation obtained here showed good agreement with the collected databank. (C) 2017 Elsevier Inc. All rights reserved.</P>
Isomer spectroscopy of neutron-rich <sup>168</sup>Tb<sub>103</sub>
Gurgi, L.A.,Regan, P.H.,Sö,derströ,m, P.-A.,Watanabe, H.,Walker, P.M.,Podolyá,k, Zs.,Nishimura, S.,Berry, T.A.,Doornenbal, P.,Lorusso, G.,Isobe, T.,Baba, H.,Xu, Z.Y.,Sakurai, H.,Sumikama Elsevier 2017 Radiation physics and chemistry Vol.140 No.-
<P>In-flight fission of a 345 MeV per nucleon U-238 primary beam on a 2 mm thick Be-9 target has been used to produce and study the decays of a range of neutron-rich nuclei centred around the doubly mid-shell nucleus Dy-170 at the RIBF Facility, RIKEN, Japan. The produced secondary fragments of interest were identified event by-event using the BigRIPS separator. The fragments were implanted into the WAS3ABI position sensitive silicon active stopper which allowed pixelated correlations between implants and their subsequent beta-decay. Discrete gamma-ray transitions emitted following decays from either metastable states or excited states populated following beta decay were identified using the 84 coaxial high-purity germanium (HPGe) detectors of the EURICA spectrometer, which was complemented by 18 additional cerium-doped lanthanum bromide (LaBr3) fast-timing scintillation detectors from the FATIMA collaboration. This paper presents the internal decay of a metastable isomeric excited state in the odd-odd nucleus Tb-168, which corresponds to a single proton-neutron hole configuration in the valence maximum nucleus Dy-170. These data represent the first information on excited states in this nucleus, which is the most neutron-rich odd-odd isotope of terbium (Z=65) studied to date. Nilsson configurations associated with an axially symmetric, prolate-deformed nucleus are proposed for the Tb-168 ground state the observed isomeric state by comparison with Blocked BCS-Nilsson calculations.</P>
Taprogge, J.,Jungclaus, A.,Grawe, H.,Nishimura, S.,Xu, Z.Y.,Doornenbal, P.,Lorusso, G.,Ná,cher, E.,Simpson, G.S.,Sö,derströ,m, P.-A.,Sumikama, T.,Baba, H.,Browne, F.,Fukuda, N.,Gernh&aum North-Holland Pub. Co 2014 Physics letters. Section B Vol.738 No.-
<P><B>Abstract</B></P> <P>The decay of an isomeric state in the neutron-rich nucleus <SUP>129</SUP>Cd has been observed via the detection of internal conversion and Compton electrons providing first experimental information on excited states in this nucleus. The isomer was populated in the projectile fission of a <SUP>238</SUP>U beam at the Radioactive Isotope Beam Factory at RIKEN. From the measured yields of <I>γ</I>-rays and internal conversion electrons, a multipolarity of <I>E</I>3 was tentatively assigned to the isomeric transition. A half-life of <SUB> T 1 / 2 </SUB> = 3.6 ( 2 ) ms was determined for the new state which was assigned a spin of ( 21 / <SUP> 2 + </SUP> ) , based on a comparison to shell model calculations performed using state-of-the-art realistic effective interactions.</P>
RADIATION SAFETY STUDIES AT TOHOKU UNIVERSITY CYRIC
Yamadera, M. Baba A.,Miura, T.,Aoki, T.,Hagiwara, M.,Kawata, N. 대한방사선 방어학회 2001 방사선방어학회지 Vol.26 No.3
A brief introduction is presented on the radiation safety studies at Tohoku University Cyclotron & Radioisotope Center. Studios on two subject are described; (1) measurement of the thick target neutron yield and radioisotope production / activation cross section for ten's of MeV neutrons and ions using K=110 Tohoku University cyclotron to provide basicdata fur accelerator shielding, and (2) development of techniques for high sensitive radiation detection and profile measurement using an Imaging Plate which is a high sensitive two-dimensional radiation sensor. Application of the Imaging Plate techniques to localization of very weak radioactivity and to neutron profile measurement is described.