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Carbon Resources Conversion 2023年第1期6卷 43-50页

作者： Pedro Domingos Dauce Ryo Suzuki Ayano Nakamura kenji murakami Department of Material Science Graduate School of Engineering ScienceAkita University1-1 Tegata Gakuen-tyoAkita-shiAkita 010-8502Japan

A degradative solvent extraction method for upgrading low-rank coal was performed at 200-350◦C for 90 min to obtain a substance dissolved in the solvent at room temperature(Soluble).Because the resulting mixture exhibited a high carbon content without ash,it could be readily used as a ***,deep eutectic solvents(DESs)have attracted attention for improving the Soluble yield and decreasing the oxygen content in *** is known to cleave oxygen-containing functional groups in biomass and is considered effective for deoxidizing low-rank ***,DES was prepared by mixing choline chloride,FeCl3⋅6H2O,and Adaro subbituminous coal(AD)and then added to 1-methylnaphthalene(1-MN)in a non-polar solvent,followed by degradative solvent extraction in the range of 200-350◦*** effects of reaction temperature and added DES amount on the product yield and the composition were *** the reaction temperature and amount of DES added increased,the Soluble yield and carbon content *** was also found that the thermal decomposition temperature and oxygen content decreased with the increasing DES *** decrease indicates that DES promotes the deoxygenation and decomposition of AD and increases the soluble yield of the fuel source.

关键词： Low-rank coal Degradative solvent extraction Deep eutectic solvent Reaction temperature Upgrading

Heavy metal removal from aqueous solution using carbonaceous K_2S-impregnated adsorbent

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Journal of Environmental Sciences 2009年第12期21卷 1730-1734页

作者： Takaaki Wajima kenji murakami Takahiro Kato Katsuyasu Sugawara Faculty of Engineering and Resource Science Akita University

A novel carbonaceous adsorbent for heavy metal removal was prepared from raw coal by one-step simple sulfur impregnation using K2S. Raw coal was mixed with K2S powder and then heated at 800℃ for 30 min in nitrogen to produce K2S char. The sulfur content and form in K2S char were determined, and the ability of K2S char to adsorb Zn^2＋, Cd^2＋ and Pb^2＋ was examined. The K2S impregnation was effective at impregnating sulfur into coal, especially in the form of elemental, thiophenic and sulfatic sulfur. The sulfur content of K2S char was higher than those of raw coal and pyrolysis char. The Zn^2＋ removal in 2.4 mmol/L of Zn^2＋ solution by K2S char was higher than raw coal with the removal rate of 100%. K2S char adsorbed Pb^2＋ and Cd^2＋ in 24 mmol/L of Pb^2＋ and Cd^2＋ solution with the removal rate of 97% and 35%, respectively. The elution extents of adsorbed Pb^2＋ and Cd^2＋ were zero in distilled water and 27% in 0.1 mol/L HCl solution. These results indicated that an effective adsorbent for heavy metal ions was prepared from coal using K2S sulfur impregnation, and that the adsorbed metals were strongly retained in K2S char.

关键词： sulfur impregnation carbonaceous adsorbent K2S heavy metal adsorption

Treatment strategy for pancreatic head cancer with celiac axis stenosis in pancreaticoduodenectomy:A case report and review of literature

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World Journal of Gastroenterology 2022年第8期28卷 868-877页

作者： Eiji Yoshida Yasutoshi Kimura Takuro Kyuno Ryoko Kawagishi Kei Sato Tsuyoshi Kono Takehiro Chiba Toshimoto Kimura Hitoshi Yonezawa Osamu Funato Makoto Kobayashi kenji murakami Akinori Takagane Ichiro Takemasa Department of Surgery Hakodate Goryoukaku HospitalHakodate City 040-8611Japan Department of Surgery Surgical Oncology and ScienceSapporo Medical UniversitySapporo City 060-8543HokkaidoJapan Department of Diagnostic Radiology Hakodate Goryoukaku HospitalHakodate City 040-8611Japan

BACKGROUND During pancreaticoduodenectomy in patients with celiac axis(CA)stenosis due to compression by the median arcuate ligament(MAL),the MAL has to be divided to maintain hepatic blood flow in many ***,MAL division often fails,and success can only be determined *** overcome this problem,we performed endovascular CA stenting preoperatively,and thereafter safely performed *** present this case as a new preoperative treatment strategy that was *** SUMMARY A 77-year-old man with a diagnosis of pancreatic head cancer presented to our department for *** assessment revealed CA stenosis caused by *** performed endovascular stenting in the CA preoperatively because we knew that going into the operation without a strategy could lead to ischemic ***-antiplatelet therapy(DAPT)–which is needed when a stent is inserted–was then administered in parallel with neoadjuvant chemotherapy(NAC).This allowed us to administer DAPT for a sufficient period before the main pancreaticoduodenectomy procedure while obtaining therapeutic effects from *** stomach-preserving pancreaticoduodenectomy was *** operation did not require any unusual techniques and was performed ***,the patient progressed well,without any ischemic ***,curative resection was confirmed,and the patient had no recurrence or complications due to ischemia up to six months *** Preoperative endovascular stenting,with NAC and DAPT,is effective and safe prior to pancreaticoduodenectomy in potentially resectable pancreatic cancer.

关键词： Pancreaticoduodenectomy Celiac axis stenosis Median arcuate ligament Endovascular stenting Pancreatic head cancer Case report

The Aggregation of Bentonite Using Poly(N-isopropylacrylamide) as a Flocculant

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Journal of Materials Science and Chemical Engineering 2018年第4期6卷 94-108页

作者： Ayano Nakamura kenji murakami Department of Materials Science Faculty of Engineering Science Akita University Akita Japan

Sedimentation tests of bentonite suspension were carried out by adding various concentrations of poly(N-isopropylacrylamide) (PNIPAM) with different molecular weights as flocculant below and above lower critical solution temperature (LCST). Also, the effect of PNIPAM on aggregation of bentonite was investigated by sedimentation rate, turbidity of supernatant. Additionally, XRD patterns and SEM photographs were measured in order to consider aggregation mechanism of PNIPAM. The sedimentation rate and turbidity for the PNIPAM with large molecular weight or PNIPAM solution of high concentration above LCST were faster and clearer than those with small molecular weight or low concentration. From XRD patterns, the peak of bentonite sediment with PNIPAM shifted to the low-angle side, suggesting that a part of PNIPAM chain entered between bentonite layers. Furthermore, it was confirmed by SEM photographs that PNIPAM covered bentonite surface after sedimentation test. It was indicated that PNIPAM adsorbs on the bentonite surface and aggregates each bentonite particle above LCST. From these results, PNIPAM works as a flocculant and the PNIPAM with large molecular weight has a good ability.

关键词： Bentonite Sedimentation Flocculant Temperature-Responsive Polymer Molecular Weight

Synthesis of P(NIPAM-co-Am)/Mesoporous Silica Composites and Their Temperature- Responsive Anion Exchange

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Journal of Materials Science and Chemical Engineering 2015年第7期3卷 7-15页

作者： kenji murakami Yasuto Sato Yukihiko Inoue Department of Materials Science Faculty of Engineering Science Akita University Akita City Japan

The purpose of this study is to examine the structure and the temperature-responsive anion exchange property of amino-functionalized mesoporous silica coated with temperature-responsive copolymer, poly(N-isopropylacrylamide-co-acrylamide) (P(NIPAM-co-Am)). For this purpose, the composites which contained 0, 10, or 20 wt% of Am were synthesized. From the TG results, it was found that the amounts of copolymer immobilized on the mesoporous silica were 1.6 - 2.6 wt%. XRD patterns revealed that the structures of composites were hexagonal and almost the same as that of original mesoporous silica without polymer. At low temperature the methyl orange (MO) anions adsorbed and desorbed reversibly with changing pH of the solution, while at high temperature the MO anions did not. This temperature, at which the amount of adsorbed MO anions changed considerably, shifted to the higher temperature side with increasing the amount of added Am.

关键词： Mesoporous Silica Temperature-Responsive Anion Exchanger N-Isopropylacrylamide Acrylamide Transition Temperature

A Robust Digital Watermark using Multiresolution Analysis of Image

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A Robust Digital Watermark using Multiresolution Analysis of...

Study on the Pollen Thermo-Sensitive and Stigma Exsertion Male Sterile Line Tomato (Lycopersicon esculentum Mill.) cv. Da107

2000年第16届世界计算机大会

作者： kenji murakami Yoshito Ueno Graduate School of Information Systems Science SOKA University.1-236 Tangi-cho Hachioji-shiTokyo 192-8577Japan

＜正＞In this paper,we propose how to embed the watermark into an image under wavelet transform precisely utilizing an appropriate filter for specifying the embedded position and clustering the variance of multi-resolution representation of an *** system has a feature of the robustness against alteration attacks of malicious users utilizing the precise detection of embedded watermark.

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