著者

齋藤 正憲 Masanori SAITO

出版者

埼玉学園大学

雑誌

埼玉学園大学紀要. 人間学部篇 (ISSN:13470515)

巻号頁・発行日

no.17, pp.75-86, 2017-12

著者

Hironobu IWABUCHI Nurfiena Sagita PUTRI Masanori SAITO Yuka TOKORO Miho SEKIGUCHI Ping YANG Bryan A. BAUM

出版者

Meteorological Society of Japan

雑誌

気象集誌. 第2輯 (ISSN:00261165)

巻号頁・発行日

vol.96B, pp.27-42, 2018 (Released:2018-03-16)

参考文献数

35

被引用文献数

46

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An algorithm for retrieving the macroscopic, physical, and optical properties of clouds from thermal infrared measurements is applied to the Himawari-8 multiband observations. A sensitivity study demonstrates that the addition of the single CO2 band of Himawari-8 is effective for the estimation of cloud top height. For validation, retrieved cloud properties are compared systematically with collocated active remote sensing counterparts with small time lags. While retrievals agree reasonably for single-layer clouds, multilayer cloud systems with optically thin upper clouds overlying lower clouds are the major source of error in the present algorithm. Validation of cloud products is critical for identifying the characteristics, advantages, and limitation of each product and should be continued in the future.  As an application example, data are analyzed for eight days in the vicinity of the New Guinea to study the diurnal cycle of the cloud system. The present cloud property analysis investigates cloud evolution through separation of different cloud types and reveals typical features of diurnal cycles related to the topography. Over land, middle clouds increase from 0900 to 1200 local solar time (LST), deep convective clouds develop rapidly during 1200-1700 LST with a subsequent increase in cirrus and cirrostratus cloud amounts. Over the ocean near coastlines, a broad peak of convective cloud fraction is seen in the early morning. The present study demonstrates the utility of frequent observations by Himawari-8 for life cycle study of cloud systems, owing to the ability to capture their continuous temporal variations.

著者

齋藤 正憲 Masanori SAITO

出版者

埼玉学園大学

雑誌

埼玉学園大学紀要. 人間学部篇 (ISSN:13470515)

巻号頁・発行日

no.20, pp.43-55, 2020-12

著者

齋藤 正憲 Masanori SAITO

出版者

埼玉学園大学

雑誌

埼玉学園大学紀要. 人間学部篇 (ISSN:13470515)

巻号頁・発行日

no.18, pp.27-36, 2018-12

著者

Turgut Yigit Akyol Rieko Niwa Hideki Hirakawa Hayato Maruyama Takumi Sato Takae Suzuki Ayako Fukunaga Takashi Sato Shigenobu Yoshida Keitaro Tawaraya Masanori Saito Tatsuhiro Ezawa Shusei Sato

出版者

Japanese Society of Microbial Ecology · The Japanese Society of Soil Microbiology

雑誌

Microbes and Environments (ISSN:13426311)

巻号頁・発行日

pp.ME18109, (Released:2018-12-22)

被引用文献数

31

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Arbuscular mycorrhizal (AM) fungi are important members of the root microbiome and may be used as biofertilizers for sustainable agriculture. To elucidate the impact of AM fungal inoculation on indigenous root microbial communities, we used high-throughput sequencing and an analytical pipeline providing fixed operational taxonomic units (OTUs) as an output to investigate the bacterial and fungal communities of roots treated with a commercial AM fungal inoculum in six agricultural fields. AM fungal inoculation significantly influenced the root microbial community structure in all fields. Inoculation changed the abundance of indigenous AM fungi and other fungal members in a field-dependent manner. Inoculation consistently enriched several bacterial OTUs by changing the abundance of indigenous bacteria and introducing new bacteria. Some inoculum-associated bacteria closely interacted with the introduced AM fungi, some of which belonged to the genera Burkholderia, Cellulomonas, Microbacterium, Sphingomonas, and Streptomyces and may be candidate mycorrhizospheric bacteria that contribute to the establishment and/or function of the introduced AM fungi. Inoculated AM fungi also co-occurred with several indigenous bacteria with putative beneficial traits, suggesting that inoculated AM fungi may recruit specific taxa to confer better plant performance. The bacterial families Methylobacteriaceae, Acetobacteraceae, Armatimonadaceae, and Alicyclobacillaceae were consistently reduced by the inoculation, possibly due to changes in the host plant status caused by the inoculum. To the best of our knowledge, this is the first large-scale study to investigate interactions between AM fungal inoculation and indigenous root microbial communities in agricultural fields.

著者

Reiji Fujimaki Takahiro Tateishi Ayato Kohzu Masanori Saito Naoko Tokuchi

出版者

Japanese Society of Soil Microbiology

雑誌

土と微生物 (ISSN:09122184)

巻号頁・発行日

vol.55, no.2, pp.121-128, 2001-10-01 (Released:2017-05-31)

参考文献数

21

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Arbuscular mycorrhizal (AM) colonization pattern in the roots of 4 plant species, Cryptomeria japonica (coniferous tree), Lindera triloba (deciduous shrub), Hydrangea hirta (deciduous shrub) and Leucosceptrum stellipilum (perennial herb), was investigated in a Japanese red cedar (C. japonica) forest on Mt. Ryuoh, central Japan. The AM colonization percentage was determined at different sampling sites along the slope. The AM colonization percentage in L. triloba was higher in the upper part of the slope than in the lower part. Topographic variations in soil nitrogen availability may have affected the AM colonization of the roots of L. triloba at the study site. However, other plants did not show such topographic changes in the AM colonization percentage. Microscopic observation of the morphological characteristics of AM colonization revealed that H. hirta and L. stellipilum were classified as Arum-type plants. In contrast, the mycorrhizas of C. japonica and L. triloba contained coiled hyphae to some extent as well as vesicles and arbuscules. Therefore, these two plants may be intermediate species between Arum- and Paris-type plants.

著者

齋藤 正憲 Masanori SAITO

出版者

埼玉学園大学

雑誌

埼玉学園大学紀要. 人間学部篇 = Bulletin of Saitama Gakuen University. Faculty of Humanities (ISSN:13470515)

巻号頁・発行日

vol.20, pp.43-55, 2020-12-01

著者

齋藤 正憲 Masanori SAITO

出版者

埼玉学園大学

雑誌

埼玉学園大学紀要. 人間学部篇 = Bulletin of Saitama Gakuen University. Faculty of Humanities (ISSN:13470515)

巻号頁・発行日

vol.18, pp.27-36, 2018-12-01

著者

Masanori SAITO

出版者

The Seismological Society of Japan, The Volcanological Society of Japan , The Geodetic Society of Japan

雑誌

Journal of Physics of the Earth (ISSN:00223743)

巻号頁・発行日

vol.22, no.3, pp.313-324, 1974 (Released:2009-04-30)

参考文献数

2

被引用文献数

4 5

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The use of Hilbert transform is essential when we are dealing with bandwidth limited signals and causal functions. However, the Hilbert transform is originally defined for functions of continuous arguments and is not of immediate use for discrete (sampled) functions which are the common form of data today. In this paper we propose two kinds of 'discrete Hilbert transforms'; one is defined on the discrete time domain and the other on the frequency domain of sampled functions. It will be shown that the essential properties of the conventional Hilbert transform are conserved in the new definitions.