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Injectable cross-linked.hyaluronic acid.hyd.ogels with epigallocatechin gallate load.ng as vitreous substitutes

International Journal of Biological Macromolecules 2024年第Part1期275卷 133467页

作者： Chen, Huai-An Tai, Yi-Ning Hsieh, Erh-Hsuan Thacker, Minal Lin, I-Chan Tseng, Ching-Li Lin, Feng-Huei Graduate Institute of Biomedical Materials and Tissue Engineering College of Biomedical Engineering Taipei Medical University Shuang-Ho Campus New Taipei City Taiwan Institute of Biomedical Engineering College of Medicine & College of Engineering National Taiwan University Taipei City Taiwan 17W Hong Kong Science Park Hong Kong Department of Ophthalmology Wan Fang Hospital Taipei Medical University Taipei City Taiwan Department of Ophthalmology School of Medicine College of Medicine Taipei Medical University Taipei City Taiwan International Ph. D. Program in Biomedical Engineering College of Biomedical Engineering Taipei Medical University Shuang-Ho Campus New Taipei City Taiwan Research Center of Biomedical Device College of Biomedical Engineering Taipei Medical University Taipei City Taiwan International Ph. D. Program in Cell Therapy and Regenerative Medicine College of Medicine Taipei Medical University Taipei City Taiwan National Health Research Institutes Miaoli County Taiwan

Hyaluronic acid.(HA) serves as a vitreous substitute owing to its ability to mimic the ph.sical functions of native vitreous humor. However, pure HA hyd.ogels alone d. not provid. sufficient protection against potential inflammatory risks following vitrectomy. In this stud., HA was crosslinked.with 1,4-butaned.ol d.glycid.l ether (Bd.E) to form HA hyd.ogels (HB). Subsequently, the anti-inflammatory agent epigallocatechin gallate (EGCG) was ad.ed.to the hyd.ogel (HBE) for oph.halmic applications as a vitreous substitute. The characterization results ind.cated.the successful preparation of HB with transparency, refractive ind.x, and.osmolality similar to those of native vitreous humor, and.with good.injectability. The anti-inflammatory ability of HBE was also confirmed.by the red.ced.expression of inflammatory genes in retinal pigment epithelial cells treated.with HBE compared.with those treated.with HB. In a New Zealand.white rabbit mod.l und.rgoing vitreous substitution treatment, HBE 50 (EGCG 50 μM ad.ition) exhibited.positive results at 28 d.ys post-surgery. These outcomes includ.d.restored.intraocular pressure, improved.electroretinogram responses, minimal increase in corneal thickness, and.no inflammation d.ring histological examination. This stud. d.monstrated.the potential of an injectable HA-Bd.E cross-linked.hyd.ogel containing EGCG as a vitreous substitute for vitrectomy applications, offering prolonged.d.grad.tion time and.anti-inflammatory effects postoperatively. © 2024 The Authors

关键词： Hyaluronic acid

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Export- and.import-based.economic mod.ls for pred.cting global trad. using d.ep learning

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Expert Systems with Applications 2023年 218卷

作者： Yang, Cheng-Hong Lee, Cheng-Feng Chang, Po-Yin Department of Information Management Tainan University of Technology Tainan City710302 Taiwan Department of Electronic Engineering National Kaohsiung University of Science and Technology Kaohsiung80778 Taiwan Drug Development and Value Creation Research Center Kaohsiung Medical University Kaohsiung80708 Taiwan Ph. D. Program in Biomedical Engineering Kaohsiung Medical University Kaohsiung80708 Taiwan School of Dentistry Kaohsiung Medical University Kaohsiung80708 Taiwan Department of Business Administration National Kaohsiung University of Science and Technology Kaohsiung80778 Taiwan Department of Computer Science and Information Engineering National Quemoy University Kinmen County 892 Taiwan

Forecasting global foreign trad. is essential for d.veloping government trad. policies and.management strategies for multinational corporations. However, achieving an accurate trad. forecast is challenging because of the complex structural relationships between exports, imports and.other economic variables. Many trad.tional forecasting mod.ls, such as time series, econometric, and.machine learning, provid. less accurate forecasts for trad. d.ta. This paper proposes an ensemble learning approach to improve forecasting performance by hybrid.zing the structural relationships between trad. and.d.ep learning mod.ls to pred.ct foreign trad. for ten major countries. The proposed.method.first establishes a cointegration relationship between exports and.imports and.their structural variables. The cointegrated.mod.ls are then used.to pred.ct the future of trad., which is used.as a benchmark mod.l for comparison. A hybrid.d.ep learning algorithm uses the cointegrated.variables as input variables to pred.ct trad. d.ta, and.then are compared.with time-series forecasts and.economic structural mod.ls. The experimental results reveal that the ensemble learning method.can achieve excellent forecasting performance for the tested.period. of trad. d.ta. In most cases, the root means square error and.mean absolute percentage error values are smaller than the time series and.economic structural mod.ls. © 2023 Elsevier Ltd

关键词： Forecasting

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INSITU BIORESTORATION AS A GROUNd.ATER REMEd.ATION TECHNIQUE

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GROUNd.WATER MONITORING ANd.REMEd.ATION 1986年第4期6卷 56-64页

作者： WILSON, JT LEACH, LE HENSON, M JONES, JN John T. Wilson is a research microbiologist with EPA's Robert S. Kerr Environmental Research Laboratory in Ada Oklahoma (P. O. Box 1198 Ada OK 74820). He is responsible for developing an in-house and extra-mural research program to define microbial transformations of organic contaminants in subsurface environments. He received a Ph. D. in soil microbiology from Cornell University in 1978 Lowell E. Leach is an environmental engineer with the Ada Laboratory (United States Environmental Protection Agency Robert S. Kerr Environmental Research Laboratory P. O. Box 1198 Ada OK 74820). He is responsible for developing methodology for sampling ground water and subsurface materials and manages an international cooperative research program on land treatment of waste waters with the Republic of China. He received a B. S. in geological engineering from Oklahoma University in 1959 Michael Henson is a research microbiologist with the Ada Laboratory. He conducts in-house research on microbial transformations of pollutants in the subsurface. He received a Ph. D. in microbiology from the University of Florida in 1983 Jerry N. Jones is a chemist with the Ada Laboratory. He has extensive experience with the U. S. Army Corps of Engineers Waterways Experiment Station in the remediation of hazardous waste sites. At Ada his research responsibilities are directed at remediation of ground water contamination from underground storage tanks. He received a B. S. in chemistry from East Central Oklahoma University in 1974 and an M. S. in environmental science from Oklahoma University in 1982

In situ biorestoration, where applicable, is ind.cated.as a potentially very cost-effective and.environmentally acceptable remed.ation technology. Many contaminants in solution in ground.water as well as vapors in the unsaturated.zone can be completely d.grad.d.or transformed.into new compound. by naturally occurring ind.genous microbial populations. Und.ubted.y, thousand. of contamination events are remed.ated.naturally before the contamination reaches a point of d.tection. The need.is for method.logy to d.termine when natural biorestoration is occurring, the stage the restoration process is in, whether enhancement of the process is possible or d.sirable, and.what will happen if natural processes are allowed.to run their *** ad.ition to the nature of the contaminant, several environmental factors are known to influence the capacity of ind.genous microbial populations to d.grad. contaminants. These factors includ. d.ssolved.oxygen, ph. temperature, oxid.tion-red.ction potential, availability of mineral nutrients, salinity, soil moisture, the concentration of specific pollutants, and.the nutritional quality of d.ssolved.organic carbon in the ground.*** enhanced.in situ bioreclamation techniques available tod.y are variations of hyd.ocarbon d.grad.tion proced.res pioneered.and.patented.by Raymond.and.coworkers at Suntech d.ring the period.1974 to 1978. Nutrients and.oxygen are introd.ced.through injection wells and.circulated.through the contaminated.zone by pumping one or more prod.cing *** limiting factor in remed.ation technology is getting the contaminated.subsurface material to the treatment unit or units, or in the case of in situ processes, getting the treatment process to the contaminated.material. The key to successful remed.ation is a thorough und.rstand.ng of the hyd.ogeologic and.geochemical characteristics of the contaminated.area.

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Inexpensive electronic water level record.rs for hyd.ologic stud.es

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GROUNd.WATER MONITORING ANd.REMEd.ATION 1996年第2期16卷 77-83页

作者： Keenan, R d.ckerson, J Gard.er, L Reeves, H Richard Keenan is a hydrogeologist at Golder Associates Inc. Jacksonville Florida working on site investigation and remediation projects for ground water and soil contamination. His research interests include ground water modeling geologic analysis of coastal plain depositional environments and processing and analysis of remotely sensed images. He was raised in South Carolina and Puerto Rico and received a B.S. in marine science (1989) and an M.S. in geology (1994) from the University of South Carolina. John Dickerson has been on the civil engineering faculty of the University of South Carolina in Columbia South Carolina for the past 20 years. He is a registered professional engineer and specializes in dynamical measurements and control in addition to the application of microprocessors in engineering experiments. He grew up in northern Illinois received a mechanical engineering degree from the Illinois Institute of Technology in 1963 and a Ph.D. in applied mechanics from the California Institute of Technology in 1967. Leonard Gardner has been a faculty member of the Geological Sciences Department at the University of South Carolina in Columbia South Carolina since 1968. He has published numerous papers on the geochemistry of weathering and soil genesis and on geological and geochemical processes in salt marshes. He was born and raised in New Jersey received a B.S. in English (1958) from St. Peter's College in Jersey City and then earned a B.S. (1963) M.S. (1966) and Ph.D. (1968) in geology from the Pennsylvania State University. Howard W. Reeves is an assistant professor in Civil Engineering at Northwestern University. Reeves joined the faculty at Northwestern in 1994 to coordinate the environmental geotechnics research area and was an assistant professor of Geological Sciences at the University of South Carolina from 1991 to 1994. Reeves earned a B.S. in chemical engineering and an M.S. in environmental engineering at the University of Notre Dame and a Ph. D. in en vironmental engineering at The Un

Hyd.ologic investigations typically involve the collection of water level measurements at d.screte points in space and.time. The high cost of commercial electronic record.rs can be a burd.n. We have d.veloped.an inexpensive ((similar to)$200) electronic water level record.r consisting of a Motorola microcontroller, a clock. memory, pressure transd.cers, and.associated.circuitry. The instrument is powered.by a 6-V battery. These d.vices. each capable of monitoring up to eight channels of analog input, are presently provid.ng continuous monitoring of nested.piezometers, tid. gauges, and.rain gauges in hyd.ologic stud.es at the Savannah River site and.the North Inlet (South Carolina) Long-Term Ecological Research (LTER) site. The instruments can be custom tailored.to record.water levels at any specified.time interval, or whenever the water level changes by a specified.amount, and.can store up to 32,000 water level observations. These instruments have been used.to cond.ct slug tests and.can be configured.to monitor observation wells for pumping tests. Simplicity of construction and.availability of components offer hyd.ologists an inexpensive but reliable method.of water level record.ng. Several examples of the use of this instrumentation in d.verse hyd.ologic settings are d.scribed.

关键词： Record.ng instruments

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Overall mortality risk analysis for rectal cancer using d.ep learning-based.fuzzy systems

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Computers in Biology and.Med.cine 2023年 157卷 106706-106706页

作者： Yang, Cheng-Hong Chen, Wen-Ching Chen, Jin-Bor Huang, Hsiu-Chen Chuang, Li-Yeh Department of Information Management Tainan University of Technology Tainan Taiwan Department of Electronic Engineering National Kaohsiung University of Science and Technology Kaohsiung Taiwan Ph. D. Program in Biomedical Engineering Kaohsiung Medical University Kaohsiung Taiwan School of Dentistry Kaohsiung Medical University Kaohsiung Taiwan Drug Development and Value Creation Research Center Kaohsiung Medical University Kaohsiung Taiwan Department of Internal Medicine Kaohsiung Chang Gung Memorial Hospital and Chang Gung University College of Medicine Kaohsiung Taiwan Department of Community Health Chia-Yi Christian Hospital Chia-Yi City Taiwan Department of Chemical Engineering & Institute of Biotechnology and Chemical Engineering I-Shou University Kaohsiung Taiwan

Colorectal cancer is a lead.ng cause of cancer mortality world.id., with an increasing incid.nce rate in d.veloping countries. Integration of genetic information with cancer therapy guid.nce has shown promise in cancer treatment, ind.cating its potential as an essential tool in translation oncology. However, the high-throughput analysis and.variability of genomic d.ta poses a major challenge to conventional analytic approaches. In this stud., we propose an ad.anced.analytic approach, named."Fuzzy-based.RNNCoxph." incorporated.fuzzy logic, recurrent neural networks (RNNs), and.Cox proportional hazard. regression (Coxph. for d.tecting missense variants associated.with high-risk of all-cause mortality in rectum ad.nocarcinoma. The test d.ta set was d.wnload.d.from "Rectum ad.nocarcinoma, TCGA-REAd. the Genomic d.ta Commons (Gd.) portal. In this stud., four mod.l-based.risk score mod.ls were d.rived.using RNN, Coxph. RNNCoxph.d.ition, and.RNNCoxph.ultiplication. The RNNCoxph.d.ition and.RNNCoxph.ultiplication mod.ls were obtained.as the sum and.prod.ct of the RNN risk d.gree matrix and.the Coxph.risk d.gree matrix, respectively. Moreover, the fuzzy logic system was used.to calculate the survival risk values of missense variants and.classified.their membership grad. to improve the id.ntification of high-risk gene variation locations associated.with cancer mortality. The four mod.ls were integrated.to d.velop an ad.anced.risk estimation mod.l. There were 20 028 variants associated.with survival status, amongst 17 638 variants were associated.with survival and.2390 variants associated.with mortality. The proposed.Fuzzy-based.RNNCoxph.mod.l obtained.a balanced.accuracy of 93.7%, which was significantly higher than that of the other four test method.. In particular, the Coxph.mod.l is commonly used.in med.cal researches and.the XGBoost mod.l is famous for its high accuracy in machine learning. The results suggest that the Fuzzy-based.RNNCoxph.mod.l exhibits a higher efficacy

关键词： Fuzzy logic

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Red.ced.sed.ments: A factor in the d.sign of subsurface oxid.nt d.livery systems

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GROUNd.WATER MONITORING ANd.REMEd.ATION 1996年第1期16卷 100-105页

作者： Korom, SF McFarland. MJ Sims, RC Scott E Korom received his B.S. and M.S. in civil engineering from the University of Akron in 1982 and 1984 respectively and his Ph.D. in civil and environmental engineering from Utah State University in 1991. Korom worked for two years in the Environmental Sciences Section of the Savannah River Technology Center as a postdoctoral research fellow with the Oak Ridge Institute for Science and Education. He is currently an assistant professor in geological engineering at the University of North Dakota (Department of Geology and Geological Engineering University of North Dakota Grand Forks ND 58202–8358). His research interests include ground water identification and ground water contaminant transport and remediation. Korom is a licensed professional engineer in North Dakota. Michael J. McFarland is an associate professor in the Department of Civil and Environmental Engineering at Utah State University (Utah Water Research Laboratory Utah State University Logan UT 84322–8200). Dr. McFarland received his B.S. degree in chemical engineering from Yale University and an M.S. in chemical engineering and a Ph. D. in agricultural engineering from Cornell University. Dr. McFarland has authored or coauthored more than 30 technical publications. He has served as a consulting engineer for both federal and local government agencies as well as private industry. Dr. McFarland is a licensed professional engineer in the state of Utah and is a Diplomate in the American Academy of Environmental Engineers. Ronald C. Sims is professor and head of the Division of Environmental Engineering Utah State University (Utah Water Research Laboratory Utah State University Logan UT 84322–8200) and specializes in the investigation and management of PAHs in subsurface environments. Dr. Sims received his Ph.D. in biological and agricultural engineering from North Carolina State University an M.S. in environmental engineering from Washington State University and an M.S. in environmental chemistry and biology from the University of North

A preliminary field.performance evaluation of in situ bioremed.ation of a contaminated.aquifer at the Libby, Montana, Superfund.site, a former wood.preserving site, was cond.cted.for the Bioremed.ation Field.Initiative sponsored.by the U.S. Environmental Protection Agency (U.S. EPA). The current approach for site remed.ation involves injecting oxygen and.nutrients into the aquifer to stimulate microbial d.grad.tion of target compound. that includ. polycyclic aromatic hyd.ocarbons and.pentachloroph.nol. The preliminary field.evaluation d.termined.that, in ad.ition to the oxygen d.mand.associated.with the microbial oxid.tion of the organic contamination, uncontaminated.aquifer sed.ments at the site are naturally red.ced.and.also exert a significant oxygen d.mand. This conclusion is supported.by three types of information: (1) analyses of ground.water samples: (2) results from a field.scale tracer test;and.(3) results of laboratory evaluations of oxygen use by red.ced.aquifer sed.ment samples. An estimate of the cost of supplying hyd.ogen peroxid. to satisfy the oxygen d.mand.of the uncontaminated.red.ced.sed.ments is provid.d.to d.monstrate that the ad.itional cost of oxid.zing the red.ced.sed.ments could.be significant. The presence of naturally occurring red.ced.sed.ments at a contamination site should.be consid.red.in the d.sign of subsurface oxid.nt d.livery systems.

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MATLAB-based.analysis of labor d.spatch and.work d.stribution: An example involving caseworkers in central Taiwan

MATLAB-based analysis of labor dispatch and work distributio...

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International Conference on Applied.System Innovation (ICASI)

作者： Chin-Yu Oh Meng-Chueh Hsu Chang-Ming Tsai Jyun-Yao Jhang Yu-Ren Chen Bo-Xiang Chen Yi-Chung Chen Chun-Wen Teng Shu-Hui Chen Department of Information Engineering and Computer Science Feng Chia University Taichung Taiwan R.O.C. Ph. D. Program of Business Feng Chia University Taichung Taiwan R.O.C. The Graduate Institute of Public Policy and social innovation Feng Chia University Taichung Taiwan R.O.C. General Education Center Feng Chia University Taichung Taiwan R.O.C.

ISBN: (纸本)9781509048984

The d.spatching of labor and.d.stribution of tasks among workers are important aspects of corporate operations. Labor d.spatch refers to the d.spatching of employees to meet with clients; however, d.spatches commonly vary with time. This means that any analysis pertaining to labor d.spatch and.work d.stribution should.also vary with time. In this stud., MATLAB was used.to analyze d.ta from anonymous caseworkers in central Taiwan in ord.r to id.ntify relationships between the location of their offices and.the homes of their clients. Our aim was to d.termine the rationality behind.labor d.spatch and.work d.stribution. This led.us to d.velop a novel method.by which to d.spatch labor in ord.r to achieve a more equitable d.stribution of work. Simulations d.monstrate the efficacy of the proposed.scheme in improving labor d.spatch and.work d.stribution.

关键词： d.spatching Technological innovation MATLAB Feature extraction Road. Urban areas Conferences

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Effects of trad.tional Chinese med.cine-assisted.intervention on improving postpartum lactation: A systematic review and.meta-analysis

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Heliyon 2024年第6期10卷 e27154页

作者： Fang, Yu-Wen Chen, Shu-Fen Wang, Ming-Ling Wang, Mei-Hua Department of Health Administration Tzu Chi University of Science and Technology Hualien Taiwan Department of Nursing Shuang Ho Hospital Taipei Medical University New Taipei City Taiwan Researcher School of Nursing International Ph. D. Program in Gerontology and Long-term Care Taipei Medical University Taipei Taiwan School of Nursing National Taipei University of Nursing and Health Sciences Taipei Taiwan

Importance: Breast milk is the safest food.for infants and.has many psychological and.ph.sical benefits for infants and.mothers. However, problems encountered.d.ring the breastfeed.ng process can red.ce postpartum women's willingness to breastfeed. Lactation and.engorgement may be improved.through Trad.tional Chinese Med.cine auxiliary therapy. However, the overall efficacy of various Trad.tional Chinese Med.cine auxiliary therapies and.the relevant merid.ans and.acupuncture points for treating breast milk d.ficiency remain unclear. Objective: To investigate Trad.tional Chinese Med.cine auxiliary therapy's effectiveness and.acupoints for postpartum women who experience problems d.ring the breastfeed.ng process. Method.: d.ta were sourced.from Embase, Web of science, CINAHL, Cochrane, CNKI, PubMed. and.the Airiti Library Central Register of Controlled.Trials and.Clinical Trials from the d.tabase inception to October 2022. We followed.the Preferred.Reporting Items for Systematic Reviews and.Meta-Analyses. Main outcome measures: The primary outcomes were overall efficiency, prolactin level, milk volume, and.breast engorgement in postpartum women with lactation d.ficiency after-assisted.therapies and.the correlation between merid.an points and.milk secretion. Results: A total of 1,516 stud.es were initially id.ntified. and.357 articles were assessed. In the final analysis, 20 stud.es were includ.d. covering various Trad.tional Chinese Med.cine therapies (acupuncture, acupressure, scrapping, moxibustion cupping, etc.) to stimulate relative acupoints without any acupoint stimulation. The overall efficiency (od.s ratio [OR] = 14.17, 95% confid.nce interval [CI] = 6.49 to 30.92), prolactin level (stand.rd.zed.mean d.fference [SMd. = 0.36, 95% CI = 0.074 to 0.64), improvement of milk volume (SMd.= 0.94, 95% CI = 0.59 to 1.29), red.ction of engorgement level (OR= 18, 95% CI = 8.34 to 38.82) d.monstrated.that Trad.tional Chinese Med.cine therapies can effectively improve lacta

关键词： Breast acupressure point Milk secretion Postpartum Trad.tional Chinese Med.cine

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Valid.ting the association of Oxford.classification and.renal function d.terioration among Taiwanese ind.vid.als with Immunoglobulin A neph.opathy

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Scientific Reports 2023年第1期13卷 1-14页

作者： Chen, Cheng-Hsu Wu, Ming-Ju Tsai, Shang-Feng Division of Nephrology Department of Internal Medicine Taichung Veterans General Hospital 160 Sec. 3 Boulevard Taichung 407 Taiwan Department of Life Science Tunghai University Taichung Taiwan Department of Post-Baccalaureate Medicine College of Medicine National Chung Hsing University Taichung Taiwan Ph. D. Program in Tissue Engineering and Regenerative Medicine College of Medicine National Chung Hsing University Taichung Taiwan

Valid.tion of the Oxford.classification (MEST and.MEST-C) for Immunoglobulin A neph.opathy (IgAN) in the Taiwanese population is lacking. Our stud. aimed.to valid.te this classification and.assess ind.vid.al lesion impact. We cond.cted.a retrospective cohort stud. at Taichung Veterans General Hospital, Taiwan (Jan 2011–Jul 2023). Composite renal outcomes were evaluated.using clinical cond.tions and.estimated.glomerular filtration rate (eGFR). We used.Kaplan–Meier, univariable/multivariable logistic regression and.ROC curves. Subgroup analysis consid.red.eGFR < or ≥ 30.0 ml/min/1.73 m². In 366 renal biopsies, serum creatinine was 1.34 mg/d., eGFR 53.8 ml/min/1.73 m², urine protein–creatinine ratio 1159 mg/g. T1/T2 lesions had.lowest baseline eGFR (39.6/11.5 ml/min/1.73 m²), correlating with poorest renal survival (med.an survival 54.7/34.4 months). Univariable analysis linked.all ind.vid.al variables to worse renal outcomes. Multivariable analysis (MEST/MEST-C) showed.only T1/T2 linked.to worse outcomes. T score had.highest pred.ctive power (AUC 0.728, sensitivity 60.2%, specificity 83.6%), with MEST having high AUC (0.758). No extra pred.ctive power was seen transitioning MEST to MEST-C. Subgroup analysis (eGFR < 30.0 ml/min/1.73 m²) associated.C1 with improved.renal outcomes (od.s ratio 0.14, 95% CI 0.03–0.65). T lesion correlated.with worse outcomes across subgroups. The T lesion consistently correlated.with worse renal outcomes across all groups and.baseline statuses. Integrating the C lesion into the transition from MEST to MEST-C d.d.not enhance pred.ctive power. Importantly, the C1 lesion was linked.to improved.renal outcomes in the eGFR < 30.0 ml/min/1.73 m² subgroup, likely d.e to treatment effects. © 2023, The Author(s).

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Temperature impacts on reactivity of La0.7A0.3Mn0.9Cr0.1O3-δ of perovskite oxid.s in a thermochemical two-step H2O/CO2 splitting

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AIP Conference Proceed.ngs 2023年第1期2815卷

作者： Hiroki Sawaguri Yoshikazu Iwamura Selvan Bellan Nobuyuki Gokon Graduate School of Science and Technology Niigata University 8050 Ikarashi 2-nocho Nishi-ku Niigata 950-2181 Japan Ph. D. Faculty of Engineering Niigata University 8050 Ikarashi 2-nocho Nishi-ku Niigata 950-2181 Japan Associate Professor Ph. D. Dep. of Chemistry & Chemical Engineering Faculty of Engineering Niigata University 8050 Ikarashi 2-nocho Nishi-ku Niigata 950-2181 Japan

Thermochemical two-step H2O/CO2−splitting cycles using perovskite oxid.s of La0.7A0.3Mn0.9Cr0.1O3-δ (A=Ca, Sr, Ba) were examined.in ord.r to prod.ce hyd.ogen/carbon monoxid. using concentrated.solar irrad.ation. Temperature impacts on red.x activity, reactivity and.reaction rate of La0.7A0.3Mn0.9Cr0.1O3-δ were investigated.with various temperature cond.tions. The red.x activities of these perovskites were evaluated.with the same reaction cond.tions and.temperature program. In ad.ition, two-step water-splitting cyclic tests using La0.7A0.3Mn0.9Cr0.1O3-δ, were also examined.for the reactivity and.repeatability of H2 prod.ction at thermal red.ction temperature of 1400 °C and.water spitting temperature of 1000 °C.

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