JOPSS - Search Results

Journal Articles

Role of advection in atmospheric ammonia; A Case study at a Japanese lake basin influenced by agricultural ammonia sources

Kubota, Tomohiro; Kuroda, Hisao*; Watanabe, Mirai*; Takahashi, Akiko*; Nakazato, Ryoji*; Tarui, Mika*; Matsumoto, Shunichi*; Nakagawa, Keita*; Numata, Yasuko*; Ouchi, Takao*; et al.

Atmospheric Environment, 243, p.117856_1 - 117856_9, 2020/12

https://doi.org/10.1016/j.atmosenv.2020.117856

Times Cited Count：3 Percentile：11.13(Environmental Sciences)

The dry and wet depositions of atmospheric ammonia (NH $_{3}$ ) is one of the important pathways of nitrogen loads to aquatic ecosystems. Crop and livestock agriculture, one of the largest emitters of NH $_{3}$ in Asian countries, are known to cause high spatial and seasonal variation of NH $_{3}$ and influence the surrounding lake basin areas via its dry and wet deposition. However, the spatial characteristics of the NH $_{3}$ concentration in basin scale are not completely understood for regulation in NH $_{3}$ emission. Here we aim to clarify dominant factors of spatial and seasonal variations of the NH $_{3}$ concentration in a eutrophic lake basin surrounded by agricultural areas in Japan. Passive sampling over various land use categories in the basin was conducted at 36 sites in total from October 2018 to January 2020. Interestingly, the observed NH $_{3}$ concentration near the livestock houses were higher in winter than summer, which was inconsistent with knowledge of seasonal changes of current NH $_{3}$ emission inventory based on temperature-driven volatilization process. Comparing monthly NH $_{3}$ concentrations with various meteorological factors, we suggested the importance of seasonal advection of NH $_{3}$ from high emission sources to which has been rarely paid attention by the previous past studies. As for this, should be considered for lake ecosystem management since deposition of NH $_{3}$ is known to be closely related to the ecological processes such as phytoplankton blooming.

Journal Articles

Event structure and double helicity asymmetry in jet production from polarized collisions at = 200 GeV

Adare, A.*; Afanasiev, S.*; Aidala, C.*; Ajitanand, N. N.*; Akiba, Y.*; Al-Bataineh, H.*; Alexander, J.*; Aoki, K.*; Aphecetche, L.*; Armendariz, R.*; et al.

Physical Review D, 84(1), p.012006_1 - 012006_18, 2011/07

https://doi.org/10.1103/PhysRevD.84.012006

Times Cited Count：33 Percentile：74.58(Astronomy & Astrophysics)

We report on the event structure and double helicity asymmetry ( $A_{LL}$ ) of jet production in longitudinally polarized collisions at = 200 GeV. Photons and charged particles were measured by the PHENIX experiment. Event structure was compared with the results from PYTHIA event generator. The production rate of reconstructed jets is satisfactorily reproduced with the next-to-leading-order perturbative QCD calculation. We measured $A_{LL}$ = -0.0014 0.0037 at the lowest bin and -0.0181 0.0282 at the highest bin. The measured $A_{LL}$ is compared with the predictions that assume various distributions.

Journal Articles

Identified charged hadron production in collisions at = 200 and 62.4 GeV

Adare, A.*; Afanasiev, S.*; Aidala, C.*; Ajitanand, N. N.*; Akiba, Yasuyuki*; Al-Bataineh, H.*; Alexander, J.*; Aoki, Kazuya*; Aphecetche, L.*; Armendariz, R.*; et al.

Physical Review C, 83(6), p.064903_1 - 064903_29, 2011/06

https://doi.org/10.1103/PhysRevC.83.064903

Times Cited Count：192 Percentile：99.41(Physics, Nuclear)

Transverse momentum distributions and yields for $pi^{pm}, K^{pm}, p$ , and in collisions at = 200 and 62.4 GeV at midrapidity are measured by the PHENIX experiment at the RHIC. We present the inverse slope parameter, mean transverse momentum, and yield per unit rapidity at each energy, and compare them to other measurements at different collisions. We also present the scaling properties such as and scaling and discuss the mechanism of the particle production in collisions. The measured spectra are compared to next-to-leading order perturbative QCD calculations.

Journal Articles

Measurement of neutral mesons in + collisions at = 200 GeV and scaling properties of hadron production

Adare, A.*; Afanasiev, S.*; Aidala, C.*; Ajitanand, N. N.*; Akiba, Y.*; Al-Bataineh, H.*; Alexander, J.*; Aoki, K.*; Aphecetche, L.*; Armendariz, R.*; et al.

Physical Review D, 83(5), p.052004_1 - 052004_26, 2011/03

https://doi.org/10.1103/PhysRevD.83.052004

Times Cited Count：179 Percentile：98.34(Astronomy & Astrophysics)

The PHENIX experiment at RHIC has measured the invariant differential cross section for production of , , and mesons in collisions at = 200 GeV. The spectral shapes of all hadron transverse momentum distributions are well described by a Tsallis distribution functional form with only two parameters, and , determining the high and characterizing the low regions for the spectra, respectively. The integrated invariant cross sections calculated from the fitted distributions are found to be consistent with existing measurements and with statistical model predictions.

Journal Articles

Oxidation-Reduction Equilibrium of Fe3+/Fe2 in a Candidate Glass for Immobilization of High Level Nuclear Waste

Kawamura, Kazuhiro; Miyamoto, Yoichi; Ouchi, Jin

Glass Technology, 39(4), p.142 - 148, 2002/00

None

JAEA Reports

None

Ouchi, Jin; Nogami, Yoshitaka; Tobita, Noriyuki;

JNC TN8420 99-002, 52 Pages, 1999/01

JNC-TN8420-99-002.pdf:4.87MB

None

Journal Articles

None

Ouchi, Jin

Gekkan "Enerugi", 32(1), p.99 - 101, 1999/01

None

Journal Articles

Oxidation-reduction equilibrium of Fe $^{3+}$ /Fe $^{2+}$ in a candidate glass for immobilisation of high level nuclear waste

Iwase, Masanori*; Kawamura, Kazuhiro; Miyamoto, Yoichi; Ouchi, Jin

Glass Technology, 39(4), p.142 - 146, 1998/08

None

JAEA Reports

Measurement of glass transition temperature of waste glass by differential thermal analysis (DTA); Research report on solidification of high-level liquid waste

Ouchi, Jin; ; Kawamura, Kazuhiro; ; ; Sasage, Kenichi; Odakura, Makoto

PNC TN8410 97-044, 53 Pages, 1997/03

PNC-TN8410-97-044.pdf:1.36MB

The glass transition temperature of simulated waste glass was measured by DTA installed in CPF (Chemical Processing Facility) and HTS (High Level Waste Technology Section). This measurement was intended to confirm the agreement between hot and cold data as a part of characterization of high level waste glass. Glass transition temperature is an index of the temperature to keep thermal stability of high-level waste glass. Since devitrification deteriorates characteristics of waste glass above glass transition temperature, it is necessary to measure glass transition temperature and keep glass temperature below glass transition temperature. The conventional method to determine glass transition temperature is the measurement of thermal expansion, but DTA is adopted for radioactive sample because of easier preparation. We obtained following results by measuring glass transition temperature of simulated waste glasses after calibration with standard specimen : (1)The average glass transition temperature of TVF waste glass (P0798) measured by DTA in HTS and CPF was 494 $^{circ}$ C (standard deviation 3 : 8.2 $^{circ}$ C) and 495 $^{circ}$ C (3: 1.8 $^{circ}$ C), respectively. The difference between two analyzer was 1 $^{circ}$ C. It shows the good agreement between hot and cold DTA data. (2)Glass transition temperature of P0798 measured by thermal expansion method was 495 $^{circ}$ C(3: 8.1 $^{circ}$ C) and it agrees well with that measured by DTA. (3)The average glass transition temperature of simulated highly waste-loading glass (P1102) measured by DTA in HTS and CPF was 510.5 2.5 $^{circ}$ C.