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Journal Articles

Present status of J-PARC linac

Oguri, Hidetomo; Hasegawa, Kazuo; Ito, Takashi; Chishiro, Etsuji; Hirano, Koichiro; Morishita, Takatoshi; Shinozaki, Shinichi; Ao, Hiroyuki; Okoshi, Kiyonori; Kondo, Yasuhiro; et al.

Proceedings of 11th Annual Meeting of Particle Accelerator Society of Japan (Internet), p.389 - 393, 2014/10

no abstracts in English

Journal Articles

Improvement of endophytic bacteria using ion beams and application of bio-pesticide with plant growth Promoter made from oligo-chitosan

Aino, Masataka*; Sato, Katsuya; Narumi, Issey*; Nagasawa, Naotsugu; Yoshii, Fumio; Taguchi, Mitsumasa

JAEA-Review 2013-059, JAEA Takasaki Annual Report 2012, P. 113, 2014/03

Journal Articles

Application of bio-pesticide with plant growth promoter made from oligo-chitosan

Aino, Masataka*; Matsuura, Katsunari*; Nagasawa, Naotsugu; Yoshii, Fumio; Taguchi, Mitsumasa; Sato, Katsuya; Narumi, Issei

JAEA-Review 2012-046, JAEA Takasaki Annual Report 2011, P. 106, 2013/01

Journal Articles

Decolorization of secondary treated water from livestock urine waste

Takigami, Machiko*; Nagasawa, Naotsugu; Hiroki, Akihiro; Kasai, Noboru; Yoshii, Fumio; Tamada, Masao; Takigami, Shoji*; Shibata, Takuya*; Aketagawa, Yasushi*; Ozaki, Masuo*

Transactions of the Materials Research Society of Japan, 35(3), p.647 - 650, 2010/09

There are many livestock farmers in Gunma Prefecture. Many of the farms are located under Mt. Akagi and Haruna, which attract tourists. Furthermore, rivers around the mountains are source of water supply to metropolitan area. Therefore, the waste treatments are very important. Regulations of smell and COD (chemical oxygen demand) are severe in Gunma Prefecture. Although there is no regulation for color of drain water, color in secondary treated water from livestock urine waste has been one of the major concerns for livestock farmers. The color is a metabolite of microorganisms and not easy to be removed. People have tried to remove the color by ozone treatment, absorption using activated carbon or soils. An absorbent was prepared by radiation grafting; fibers were irradiated with $$^{60}$$Co $$gamma$$-rays and some kinds of monomers were grafted onto the fibers. The absorbent thus prepared were used to decolorize the secondary treated water. The color and COD were removed by the absorbent, however, COD removal was more difficult than decolorization. Degree of grafting (weight increase expressed in % by grafting reaction to initial weight of the fiber), treated water/absorbent ratio, flow rate of treated water, and direction of flow affected color and COD removal. The used absorbent could be used repeatedly after washing.

JAEA Reports

FNCA guideline on development of hydrogel and oligosaccharides by radiation processing

Kudo, Hisaaki*; Yoshii, Fumio; Kume, Tamikazu*

JAEA-Technology 2009-050, 54 Pages, 2009/10

JAEA-Technology-2009-050.pdf:14.3MB

This report summarizes the current status of development of hydrogel and oligosaccharides by radiation (electron and $$gamma$$ rays) processing in Asia countries, as an outcome of activities of the FNCA (Forum for Nuclear Co-operation in Asia) industry group during the phase 2 (2006-2008), as one of FNCA Guidelines. The nine countries participates in the phase 2 of the FNCA-industry group, focusing on radiation processing of natural polymers. Participating countries have been studying radiation processing of natural polymer such as chitosan from shrimp/crab shell and carrageenan taken from seaweeds, in terms of crosslinking for gel and degradation for oligosaccharides. The hydrogel and oligosaccharides obtained by radiation processing are expected application in the fields of medical,environmental conservation and aqua-cultures.

Journal Articles

Absorption of phosphate ion in swine urine using CMC gel

Takigami, Machiko*; Amada, Haruyo*; Nagasawa, Naotsugu; Hiroki, Akihiro; Kasai, Noboru; Yoshii, Fumio; Tamada, Masao

Transactions of the Materials Research Society of Japan, 33(4), p.849 - 852, 2008/12

Shortage of phosphorus becomes a serious problem in the world. The removal of phosphorus in swine urine is a big concern for the environmental conservation. To solve both problems, absorbent to absorb phosphorus in swine urine was developed using carboxymethyl cellulose (CMC) and Iron. The gel formation proceeded instantaneously when CMC and Iron (III) chloride were mixed, while gel was not formed immediately when Iron (II) chloride was used. Oxidation of Iron (II) to Iron (III) occurs gradually in Iron (II) aqueous solution. However, addition of CMC to the Iron (II) solution promoted the oxidation to form gel. The rate of gel formation could be controlled by addition of acid to CMC-Iron (II) mixture. The resultant gel absorbed phosphorus in swine urine. The absorption was about 97% in swine urine containing 78 mg/L of phosphorus.

Journal Articles

Absorption of phosphate ion in swine urine using CMC gel

Takigami, Machiko*; Amada, Haruyo*; Nagasawa, Naotsugu; Hiroki, Akihiro; Kasai, Noboru; Yoshii, Fumio; Tamada, Masao

JAEA-Review 2008-055, JAEA Takasaki Annual Report 2007, P. 44, 2008/11

no abstracts in English

Journal Articles

Effect of radiation crosslinking on stability of bent polyethylene pipe

Kasai, Noboru; Yoshii, Fumio; Yuasa, Junichi*

JAEA-Review 2007-060, JAEA Takasaki Annual Report 2006, P. 54, 2008/03

no abstracts in English

Journal Articles

Radiation effects on hydroxypropyl methylcellulose phthalate in aqueous system

Xu, L.*; Yue, Z.*; Wang, M.*; Zhai, M.*; Yoshii, Fumio; Seko, Noriaki; Peng, J.*; Wei, G.*; Li, J.*

Nuclear Instruments and Methods in Physics Research B, 265(1), p.394 - 398, 2007/12

 Times Cited Count:5 Percentile:56.77(Instruments & Instrumentation)

A water insoluble cellulose derivative, hydroxypropyl methylcellulose phthalate (HPMCP) hydrogels, was converted to Na type to form hydrogel in paste-like status by radiation crosslinking. Mechanism for radiation crosslinking of cellulose-derivatives in paste-like status was discussed. Crosslinkers, i.e., methyl $$N,N$$-bis-acrylamide (MBA) or ethyleneglycol dimethacrylate (EGDMA) has been used to decrease gelation dose (Dg) of synthesis HPMCP hydrogels and improve its mechanical properties. MBA was found to be more effective for accelerating the crosslinking of HPMCP than EGDMA. Swelling degree of HPMCP hydrogel in many kinds ofsalt solutions followed Hofmeister series, which is ubiquitous in polyelectrolyte hydrogel. Specific reswelling was observed in concentrated KF solution, implying a very strong F$$^{-}$$ binding ability of benzyl group. The comprehensive results obtained in this study will be utilized on the design of HPMCP-based controlled release system.

Journal Articles

Properties of crosslinked polylactides (PLLA & PDLA) by radiation and its biodegradability

Quynh, T. M.*; Mitomo, Hiroshi*; Nagasawa, Naotsugu; Wada, Yuki; Yoshii, Fumio; Tamada, Masao

European Polymer Journal, 43(5), p.1779 - 1785, 2007/05

 Times Cited Count:94 Percentile:5.33(Polymer Science)

Crosslinked materials derived from poly(lactide) (PLA) have been produced by radiation modification in the presence of a suitable crosslinker (triallyl isocyanurate: TAIC). The crosslinking structure introduced in PLA films has not only much improved the heat stability but also their mechanical properties. The properties of crosslinked samples are governed by crosslinking density and these improvement seemed to increase with radiation dose. This implied that the three dimensional networks have been introduced in material by radiation and the crosslinking density depended on the structure and length of PLA chains. Biodegradability of PLA was also determined by an enzymatic degradation test and burying in compost at 55 $$^{circ}$$C. Differing with PLLA, PDLA was insignificantly degraded by ${it proteinase K}$. The degradation rate of PLA in compost was postponed with the introduction of crosslinks.

Journal Articles

Metal adsorption of chitin / chitosan derivatives hydrogels crosslinked with irradiation

Nagasawa, Naotsugu; Wasikiewicz, J. M.*; Seko, Noriaki; Yagi, Toshiaki; Zhao, L.*; Mitomo, Hiroshi*; Yoshii, Fumio; Tamada, Masao

JAEA-Review 2006-042, JAEA Takasaki Annual Report 2005, P. 52, 2007/02

Radiation crosslinking of chitin / chitosan derivatives such as carboxymethylchitin (CMCt) and carboxymethylchitosan (CMCts) has been investigated. CMCt and CMCts of 40% concentration were irradiated by electron beams. The maximum gel fraction of those CMCht and CMChts reached 72% (75kGy) and 50% (100kGy) respectively. These gels absorpted water of 8.3g for CMCt and 21.2g for CMCts per 1 g of the dried gel. The absorption ability of various metal ions with these gels has been investigated. The highest adsorption of scandium and gold has been obtained for CMCt and CMCts gels, respectively.

Journal Articles

Modification of poly(lactic acid) by radiation-induced crosslinking

Nagasawa, Naotsugu; Kaneda, Ayako*; Matsuzaki, Tomoaki*; Kanazawa, Shinichi*; Yagi, Toshiaki; Tran, M. Q.*; Mitomo, Hiroshi*; Yoshii, Fumio; Tamada, Masao; Quynh, T. M.*

JAEA-Review 2006-042, JAEA Takasaki Annual Report 2005, P. 53, 2007/02

Poly(L-lactic acid), PLA was irradiated using electron beams (EB) in the presence of polyfunctional monomers (PFM) as crosslinking agent. Among the PFMs, triallyl isocyanurate (TAIC) at 3% concentration was found to be the most effective for crosslinking of PLA by irradiation technique. The crosslinked PLA obtained has heat resistance higher than 200$$^{circ}$$C. From this fact, the crosslinked PLA is applied on heat-shrinkable tube, cup and plate. The shrinkable tube has several advantages such as high heat resistance and transparency. It is therefore proven that crosslinking technology is beneficial to expanding the application of PLA.

Journal Articles

Enhancement of plant growth activity of irradiated alginate

Nagasawa, Naotsugu; Luan, L. Q.*; Yagi, Toshiaki; Yoshii, Fumio; Kume, Tamikazu; Nakanishi, Tomoko*; Tamada, Masao

JAEA-Review 2006-042, JAEA Takasaki Annual Report 2005, P. 55, 2007/02

The sodium alginate was irradiated by $$gamma$$-ray, and plant growth activity test and structural change of the product were studied. It was found that the concentration of 100 mg/L of alginate irradiated at 75 kGy in 4 % aqueous solution was the highest for plant growth. Separation of the degraded product was performed using ultrafiltration membranes and found that fraction with molecular weight in the range of 1-3 kDa (6-15 units) not only showed a remarkable effect on the plant growth, but also increased the activity of plant enzymes; ${it alcohol dehydrogenase, phenylalanine ammonia-lyase}$. This fraction was stronger than one of the enzymatic degradation product. This differences proposed formation of carbonyl and carboxyl groups along with the main-chain scission.

Journal Articles

Cooperative research on radiation processing of natural polysaccharides between VAEC and JAEA

Hiroki, Akihiro; Nagasawa, Naotsugu; Yagi, Toshiaki; Kume, Tamikazu; Yoshii, Fumio; Tamada, Masao

JAEA-Review 2006-042, JAEA Takasaki Annual Report 2005, P. 56, 2007/02

Cooperative research between Vietnam Atomic Energy Commission (VAEC) and JAEA has been performed over a period of six years. In the cooperative research, natural polysaccharides such as alginate, chitin, and chitosan were irradiated by $$gamma$$-ray to produce various functional materials. It was found that the alginate and the chitosan degraded with $$gamma$$-irradiation were effective as a growth promoter for rice and carrot and an anti-bacterial agent, respectively. On the other hand, the hydrogels obtained by $$gamma$$-irradiating carboxymethylchitosan aqueous solution in paste-like state showed a high adsorption capacity for Cu (II) ions as well as the anti-bacterial activity.

Journal Articles

Current status of adsorbent for metal ions with radiation grafting and crosslinking techniques

Seko, Noriaki; Tamada, Masao; Yoshii, Fumio

Nuclear Instruments and Methods in Physics Research B, 236(1-4), p.21 - 29, 2005/07

 Times Cited Count:91 Percentile:1.07(Instruments & Instrumentation)

Removal of toxic metals from streaming water and ground water is important task to preserve environment. Radiation processings of grafting and crosslinking can synthesis adsorbent having high performances. Graft adsorbent can be synthesized by using the conventional polymer like polyethylene having variety shapes such as membrane, cloth, and fiber. Especially, the obtained fibrous adsorbent has 100 times higher rate of adsorption than that of commercialized resin. Novel fibrous adsorption for arsenic was synthesized by direct grafting of phosphoric monomer and following zirconium-loading. Fibrous adsorbents of amidoxime and iminodiacetate were applied to the removal of cadmium from the scallop waste. Furthermore, the amidoxime adsorbent is useful to recover rare metal such as uranium and vanadium in seawater. Crosslinked natural polymers like chitin-chitosan in the paste-like state are applicable for the metal adsorbent. This adsorbent can be biodegraded after usage.

Journal Articles

Application of poly(lactic acid) modified by radiation crosslinking

Nagasawa, Naotsugu; Kaneda, Ayako*; Kanazawa, Shinichi*; Yagi, Toshiaki; Mitomo, Hiroshi*; Yoshii, Fumio; Tamada, Masao

Nuclear Instruments and Methods in Physics Research B, 236(1-4), p.611 - 616, 2005/07

 Times Cited Count:70 Percentile:1.98(Instruments & Instrumentation)

no abstracts in English

Journal Articles

Adsorption of metal ions by carboxymethylchitin and carboxymethylchitosan hydrogels

Wasikiewicz, J. M.; Nagasawa, Naotsugu; Tamada, Masao; Mitomo, Hiroshi*; Yoshii, Fumio

Nuclear Instruments and Methods in Physics Research B, 236(1-4), p.617 - 623, 2005/07

 Times Cited Count:46 Percentile:5.03(Instruments & Instrumentation)

The absorption ability of various metal ions into EB - radiation crosslinked carboxymethylchitin and carboxymethylchitosan has been investigated. The highest adsorption of Scandium and Gold has been obtained for carboxymethylchitin (CMCht) and carboxymethylchitosan (CMChts), respectively. Kinetic studies showed that adsorption of most of the metal ions occur in a relatively short period of time (2 hours). Detail investigation of adsorption of gold ions has been carried out for both hydrogels. The maximum uptake of Au cations, based on Langmuir equation was determined to be 37.59 mg/g for CMChts and 11.86 mg/g for CMCht. Both hydrogels indicate favorable adsorption of gold cations.

Journal Articles

Improvement of heat stability of poly($$_{L}$$-lactic acid) by radiation-induced crosslinking

Mitomo, Hiroshi*; Kaneda, Ayako*; Tran, M. Q.*; Nagasawa, Naotsugu; Yoshii, Fumio

Polymer, 46(13), p.4695 - 4703, 2005/06

 Times Cited Count:103 Percentile:5.64(Polymer Science)

no abstracts in English

177 (Records 1-20 displayed on this page)