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Journal of Minerals and Materials Characterization and Engineering 2018年第5期6卷 517-530页

作者： Ariuntuya Battsengel Altansukh Batnasan kazutoshi Haga Atsushi Shibayama Graduate School of Engineering and Resource Science Akita University Akita Japan Graduate School of International Resource Sciences Akita University Akita Japan

Different separation techniques such as solvent extraction, ion exchange, and precipitation are often used for recovery of rare earth elements (REEs) from pregnant leach solutions obtained from acid leaching. Solvent extraction is generally accepted as the most appropriate commercial technology for separating REEs due to the need to be able to handle larger volumes of diluted pregnant solutions. This study focused on the development of selective separation of light and heavy REEs from the pregnant leach solution obtained from leaching of apatite ore in 1 M sulfuric acid (H2SO4) using solvent extraction. Three different commercial organophosphorus extractants (di-(2-ethylhexyl) phosphoric acid (D2EHPA), 2-ethylhexyl phosphonic acid mono-2-ethylhexyl ester (PC88A) and tributyl phosphate (TBP)), and the influences of experimental parameters such as extractant concentration, organic/aqueous phase ratio, diluent type, pH, extraction time and stripping agent concentration were examined. Results showed that light REEs (LREEs) and heavy REEs (HREEs) in the pregnant leach solution were selectively separated with D2EHPA via a two-stage extraction process. In the first-stage of solvent extraction, >90% of (0.05 g/L) HREEs was extracted with 1.8 M D2EHPA in kerosene while the vast majority (>95%) of LREEs was remained in raffinate. In the second-stage, >93% (1.01 g/L) of LREEs was extracted from the raffinate with 1.8 M D2EHPA dissolved in kerosene at pH 1.6. HREEs (>95%) and LREEs (>90%) loaded with D2EHPA after the first and second-stage of extraction were stripped by 4 M H2SO4 and 1 M H2SO4 solutions, respectively. Distribution of middle rare earth elements (MREEs) was discussed through the extraction processes in this study.

关键词： Light Rare Earth Elements Heavy Rare Earth Elements Solvent Extraction Di-(2-ethylhexyl) Phosphoric Acid Stripping

Development of a Combined Flotation and High Pressure Leaching Process for Copper and Nickel Recovery from Mine Tailing

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Journal of Minerals and Materials Characterization and Engineering 2017年第3期5卷 118-131页

作者： Refilwe Sandra Magwaneng Altansukh Batnasan kazutoshi Haga Atsushi Shibayama Graduate School of International Resource Sciences Akita University Akita Japan Graduate School of Engineering Sciences Akita University Akita Japan

The present study focused on the re-processing of copper and nickel from mine tailings. In this work, recovery of copper and nickel from mine tailing by combined process of flotation and high pressure oxidative leaching were considered. In the first stage, effects of flotation parameters including collector type, collector dosage, and pH and pulp density were examined. The results showed that over 80% copper recovery was achieved under the optimized flotation conditions while nickel recovery was lower than 30% due to its co-ex-istence with gangue minerals of pyrrhotite, pyrite and other clay minerals. In the second stage, key parameters, particularly concentration of sulfuric acid, temperature, pressure and leaching time were investigated to test the leaching efficiency of copper and nickel from the flotation concentrate with high pressure oxidative leaching (HPOL). A comparison was made between the leaching efficiencies of copper and nickel from flotation concentrates and mine tailing.

关键词： Mine Tailing Flotation High Pressure Leaching Copper Nickel

Evaluation of a public expense-covered gynecologic screening program in Japan 2005-2009

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Open Journal of Obstetrics and Gynecology 2011年第2期1卷 21-24页

作者： Hiroshi Takagi Satoshi Ichigo kazutoshi Matsunami Atsushi Imai 不详

Introduction: In Japan, there is free physical check-up programs of cancer screening, by which asymptomatic participants undergo a medical examination at public expense. The present study aims to describe their gynecologic findings and compare them with the literatures reported from general hospitals and self-paid check-up programs. Methods: Medical records of Japanese women, who underwent gynecological examinations at public expense between 2005 and 2009, were retrospectively reviewed. Results: Of the cervical smears from 2850 women aged 21 - 82 years, 33 (1.1%) were classified as dysplastic and malignant changes: 28 of low-grade squamous intraepithelial lesion (LSIL), 3 high-grade squamous intraepithelial lesion (HSIL), 2 atypical squamous cells of undeterimined significance (ASC-US). No case of cervical squamous cell carcinoma or adenocarcinoma was found. Ultrasonographic examination detected uterus enlargements and ovary tumors in less than 1% of cases. Most of participants (98%) revealed no gynecologic abnormalities. Conclusion: Annual gynecologic screening and proper follow-up programs even against asymptomatic women may remarkably reduce the probability of (pre)malignant disease.

关键词： Cervical Smear Screening Transvaginal Sonography Gynecologic Check-up Oncology

Ectopic Hormone Production from Ovarian Tumor: A Review

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Open Journal of Obstetrics and Gynecology 2016年第4期6卷 252-258页

作者： Masashi Hori Hiroshi Takagi kazutoshi Matsunami Satoshi Ichigo Atsushi Imai Departments of Obstetrics and Gynecology Tokai Central Hospital Gifu Japan Departments of Obstetrics and Gynecology Matsunami General Hospital Gifu Japan

Although ectopic hormone-production is uncommon complication, certain tumors can produce symptoms due to the secretion of various bioactive substances accompanied by the aberrantly located tumors. Because of the potential for the ovary to act as a source of aberrant hormone secretion, in the literature, ectopic hormone production from ovarian tumor includes granulocyte-colony stimulating factor (G-CSF), parathyroid hormone-related protein (PTHrP), adrenocorticotropic hormone (ACTH), peptide-YY, gastrin and insulin. All patients may present with syndromes of hormone excess. Failure to localize the ovarian tumor preoperatively may be associated with a significantly higher risk of subsequent unnecessary ablative procedures. Better characterization of hormonal forms relatively specific for neoplasia may enhance the clinical value of ectopic hormones as tumor markers, especially in malignancies that are commonly associated with ectopic hormone production. These circumstances may recommend complete preoperative evaluation of the pelvis in female patients presenting with nonlocalizable endocrine tumors.

关键词： Bioactive Substance Production Ectopic Hormone Secretion Ovarian Cancer Ovarian Carcinoid Benign Ovarian Tumor

Correspondence: Newer oral rehydration solution OS-1 for emesis gravidarum

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Health 2012年第5期4卷 277-278页

作者： Atsushi Imai kazutoshi Matsunami Hiroshi Takagi Satoshi Ichigo Department of Obstetrics and Gynecology Matsunami General Hospital Gifu Japan

Though nausea and vomiting are quite common in pregnancy, hyperemesis is found in only 1 - 2 patients per 100. Appropriate oral fluid and electrolyte replacement is the initial treatment regimen for patients with mild to moderate emesis to avoid hyperemesis gravidarum defined as dehydration, electrolyte unbalance and ketosis. A newer oral rehydration solution OS-1 therapy may be safe and feasible in the mild to moderate emesis gravidarum population. Physicians are encouraged to use this practice to maintain the amount of water in the body and electrolytes and to improve the patient’s comfort.

关键词： Hyperemesis Gravidarum Nausea and Vomiting During Pregnancy Oral Rehydration Solution OS-1

EXCAVATION BY T.B.M METHOD IN SOFT-ROCK TUNNELS

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EXCAVATION BY T.B.M METHOD IN SOFT-ROCK TUNNELS

H_∞Loop Shaping Control for Plasma Vertical Position Instability on QUEST

The International Congress

作者： Kazuhito Takeda Shigenori Ohba kazutoshi Fujita Tohoku Electric Power Co. Inc.Japan Tohoku Electric Power Co. Inc.Japan Tohsei Industrial Co. Japan

＜正＞We employed an advanced tunnel boring machine（T.B.M.）available to all geological conditions,for excavating the headrace tunnel of the Koma- gome power *** results are obtained by using chemical grouting supplementarily,in spite that we encountered with harmful soft-rock layer（unconsolidated coarse-grained tuff）during excavating. Therefore,we expect this advanced T.B.M should be developped and uti- lized widely in the near future.

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Plasma Science and Technology 2013年第3期15卷 295-299页

作者：刘晓龙 Kazuo NAKAMURA Tatsuya YOSHISUE Osamu MITARAI Makoto HASEGAWA kazutoshi TOKUNAGA 薛二兵 Hideki ZUSHI Kazuaki HANADA Akihide FUJISAWA Hiroshi IDEI Shoji KAWASAKI Hisatoshi NAKASHIMA Aki HIGASHIJIMA Kuniaki ARAKI IGSES Kyushu University RIAM Kyushu University Tokai University

QUEST has a divertor configuration with a high and a negative n-index, and the problem of plasma vertical position instability control in QUEST is still under extensive study for achieving high efficiency plasma. The instability we considered is that the toroidal plasma moves either up or down in the vacuum chamber until it meets the vessel wall and is extinguished. The actively controlled coils （HCU and HCL） outside the vacuum vessel are serially connected in feedback with a measurement of the plasma vertical position to provide stabilizing control. In this work, a robust controller is employed by using the loop synthesis method, and provides robust stability over a wide range of n-index. Moreover, the gain of the robust controller is lower than that of a typical proportional derivative （PD） controller in the operational frequency range; it indicates that the robust controller needs less power consumption than the PD controller does.

关键词： vertical position instability robust control loop shaping QUEST

A Typical Case of Posterior Reversible Encephalopathy Syndrome Associated with Postpartum Eclampsia-HELLP Syndrome

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Open Journal of Obstetrics and Gynecology 2016年第6期6卷 355-359页

作者： Hiroshi Takagi kazutoshi Matsunami Satoshi Ichigo Takuma Katano Atsushi Imai Department of Obstetrics and Gynecology Matsunami General Hospital Kasamatsu Japan

Background: Posterior reversible encephalopathy syndrome (PRES) is a reversible syndrome characterized by seizures, headache, altered mentation, and loss of vision associated with white matter changes on imaging. Case: A 37-year-old multigravida woman had a severe, immediate postpartum eclampsia-HELLP syndrome (hemolysis, elevated liver enzyme levels, low platelet count) with PRES characterized by generalized seizures and altered mental status. Magnetic resonance brain imaging showed high-intensity lesions in non-posterior portions including the frontal lobe and cingulated gyrus, which resolved completely after 2 weeks along with complete symptom regression. Conclusions: Cases of postpartum PRES without involvement of posterior brain regions after eclampsia-HELLP syndrome are very rare. Patients with PRES do not always show typical manifestations. The importance of a prompt diagnosis is emphasized, as is the crucial role of rapid blood pressure reduction.

关键词： Posterior Reversible Encephalopathy Syndrome Eclampsia HELLP Syndrome Non-Posterior Lobes

Adenocarcinoma arising from heterotopic pancreas at the third portion of the duodenum

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World Journal of Gastroenterology 2015年第13期21卷 4082-4088页

作者： Nobutada Fukino Takatsugu Oida Kenji Mimatsu Youichi Kuboi kazutoshi Kida Department of Surgery Japan Community Healthcare Organization Yokohama Central HospitalKanagawa 231-8553Japan Department of General Surgical Science Nihon University HospitalTokyo 101-8309Japan

A 62-year-old Japanese man presented to our hospital with a history of weight loss of 6 kg in 4 mo. Imaging examinations revealed a tumor located on the third portion of the duodenum with stenosis. We suspected duodenal carcinoma and performed pancreas-preserving segmental duodenectomy. Adenocarcinoma arising from a heterotopic pancreas at the third portion of the duodenum was finally diagnosed by immunohistochemical staining. Malignant transformation in the duodenum arising from a heterotopic pancreas is extremely rare; to our knowledge, only 13 cases have been reported worldwide, including the present case. The most common location of malignancy is the proximal duodenum at the first and descending portion. Herein, we describe the first case of adenocarcinoma arising from a heterotopic pancreas, which was located in the third portion of the duodenum, with a review of the literature.

关键词： Adenocarcinoma Heterotopic pancreas Duodenum Segme