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| 1 | Hydrothermal carbonization of agricultural residues:A case study of the farm residues-based biogas plants显示文摘Hydrothermal carbonization(HTC)of biomass is a promising method to produce carbonaceous materials.The work presented in this article addresses the application of hydrothermal carbonization(HTC)to produce a solid fuel named HTC-Biochar,whose characteristics are comparable to lignite coal.Biogas sludge(SD),maize silage(MS),and barley silage(BS)as a substrates were hydrothermally carbonized in a 1.5 L batch reactor at 200C for 6 h.The effect of mixing ratios of different substrates on HTC was investigated.Chemical compositions and combustion characteristics of hydro-chars obtained from mono-and co-carbonization were evaluated.Result showed that HTC increased carbon contents and higher heating values(HHV)by 1.4–14.4%and 13–36%,respectively.The evolution of the H/C and O/C atomic ratios indicated that dehydration and decarboxylation occurred during hydrothermal carbonization for all samples.Furthermore,a significant synergistic enhancement was observed for HHV and carbon content.A mixing ratio of 1:1 for BS and SD showed the best performance for co-HTC.In summary,hydrothermal co-carbonization is a promising strategy to tailor high-performance hydro-char for energy applications. | Samar Seyedsadr Rafat Al Afif Christoph Pfeifer | 2018 | Carbon Resources Conversion2018，1，1： | 2 |
| 2 | Enhancement of methane yield from cotton stalks by mechanical pre-treatment显示文摘Cotton stalks(CS)are lignocellulosic agricultural by-products,a potential source for biogas production,but pretreatment must be considered since hydrolysis is the rate-limiting stage for lignocellulosic biomass substrates.This study investigates the feasibility of mechanical pretreatment of CS to enhance methane production.Batch anaerobic digestion of CS samples with particle sizes ranging from 0.5 to 65 mm was carried out in 1 L eudiometer batch digesters for 48 days at 37◦C.Results showed that methane yield was inversely proportional to particle size,and the quality of biogas was good(54.0-55.2%CH_(4)).Significant increases in methane yield were observed with 20.3%and 26%for samples with a particle size of 3 mm and 0.5 mm,respectively,compared to untreated CS.The coefficient of anaerobic energy turnover was relatively low(20.2-25.5%).Reduction of the CS particle size to 3 mm or less is recommended to achieve effective methane conversion and decrease the retention time in an anaerobic digester from 31 to about 25 days.However,to offset the high energy demand required for grinding,further research should be conducted in combining size reduction with chemical and physicochemical pretreatment. | Rafat Al Afif Christoph Pfeifer | 2021 | Carbon Resources Conversion2021，4，1： | 1 |
| 3 | H2 rich product gas by steam gasification of biomass with in situ CO2 ab-sorption in a dual fluidized bed system of 8 MW fuel input显示文摘 | STEFAN KOPPATZ CHRISTOPH PFEIFER REINHARD RAUCH | 2009 | Fuel Pro-cessing Technology2009，90，： | 1 |
| 4 | Catalytic Steam Re- forming of Model Biogas 显示文摘 | Philipp Kolbitsch Christoph Pfeifer | 2008 | Fuel2008，87，70： | 1 |
| 5 | Development of catalytic tar decomposition downstream from a dual fluidized bed biomass steam gasifier显示文摘 | Christoph Pfeifer Hermann Hofbauer | 2008 | Powder Technology2008，18，： | 1 |
| 6 | Catalytic steam reforming of model biogas显示文摘 | Kolbitsch Philipp Pfeifer Christoph Hofbauer Hennann | 2008 | Fuel2008，87，6： | 1 |
| 7 | Development of catalytic tar decomposition down stream from a dual fluidized bed biomass steam gasifier 显示文摘 | Christoph Pfeifer Hermann Hofbauer | 2008 | Powder Technology2008，180，12： | 1 |
| 8 | Gasification of lignite in a dual fluidized bed gasifier -- influence of bed material parti- cle size and the amount of steam显示文摘 | KERN Stefan PFEIFER Christoph HOBAUER Hermann | 2013 | Fuel Processing Technology2013，111，4： | 1 |
| 9 | Catalytic steam reforming of model biogas显示文摘 | PHILIPP KOLBITSCH CHRISTOPH PFEIFER HERMANN HOFBAUER | 2008 | Fuel2008，87，6： | 1 |
| 10 | Development of catalytic tar decomposition downstream from a dual fluid- ized bed biomass steam gasifier显示文摘 | Christoph Pfeifer Hermann Hofbauer | 2008 | Powder Technology2008，180，12： | 1 |
| 11 | Cat- alytic steam reforming of model biogas 显示文摘 | Philipp KOLB1TSCH Christoph PFEIFER Hermann HOFBAUER | 2008 | Fuel2008，87，6： | 1 |
| 12 | Development of cata-lytic tar decomposition downstream from a dual fluidized bedbiomass steam gasifier显示文摘 | Christoph Pfeifer Hermann Hofbauer | 2008 | Powder Technology2008，180，12： | 1 |
| 13 | In-bed catalytic tar reduction in a dual fluidized bed biomasssteam gasifier 显示文摘 | Pfeifer Christoph Rauch Reinhard Hofbauer Hermann | 2004 | Industrial & Engineering ChemistryResearch2004，43，7： | 1 |
| 14 | Biochemical methane potential of three-phase olive mill solid waste:Influence of temperature and supplemental enzymes显示文摘Methane potential of three-phase olive mill solid waste(3POMSW)was evaluated by biochemical methane potential(BMP)tests at temperatures of 37.5◦C and 55◦C.The results have shown,that thermophilic processing has a higher methane and biogas yield by 10%and 17.2%,respectively,compared to mesophilic conditions.Concluding thermophilic conditions of 3POMSW results in higher conversion of the feedstock into biogas.The result of addition of enzymes(MethaPlus,Hemicellulase,PectinaseL,Amylase S and Lipase)and their mixtures to 3POMSW at 55◦C has shown that the optimum mixture of enzymes was Metha Plus and Hemicellulase,which resulted in an increase of methane yield by 1.3%compared to the base case without addition of enzymes.Simple model equations were developed based on first-order kinetic in order to calculate the biogas yield versus the time as a function of reaction rate constant(k)and the maximum biogas yield(ymax).In this study,results have shown two different reaction rates obtained for the mixtures of enzymes with 3POMSW of 0.130 d^(-1) from t=0…14 days and 0.034 d^(-1) from t=28…63 days.The developed simple model equations can be applied for calculating the biogas yield at the time and by optimizing the process improving biological nutrient removal. | Rafat Al Afif Christoph Pfeifer | 2022 | Carbon Resources Conversion2022，5，3： | 0 |
| 15 | 内源性CD34+脂肪干细胞在提高人类脂肪移植效果持久性中的优势:一项异种移植模型显示文摘背景与目的脂肪移植是一项很有前景的软组织填充增大技术,但移植疗效持久性存在高度不可预知性,而且影响移植成活率的因素尚未明确。因为具有分化的潜能和释放生长因子的能力,脂肪来源干细胞(adipose-derivedstemcells,ADSCs)可在移植修复过程中起关键作用。我们旨在确定ADSCs在人体脂肪中呈现的生物学特性是否与移植体积的体内效果保持存在关联。方法利用标准的离心分离技术对从8例人体受术者获取的脂肪抽吸物进行处理,然后将其注射至6周龄无胸腺裸鼠躯体两侧。测量移植物的质量和体积,于移植后8周进行包含针对血管的CD31^+染色的组织学评估。从各供体脂肪抽吸物中分离获取基质血管细胞群(stromalvascularfraction,SVF),利用多参数流式细胞术对其表面标记物进行分析,并对其增值、分化能力和正常含氧量/低含氧量血管内皮细胞生长因子(vas—cularendothelialgrcwlhfactor,VEGF)的分泌情况进行实验研究。结果从不同供体中获取的SVF,其CD34^+祖细胞含量百分率存在较大差异,其平均值为21.3%±15.O%(X±s)。SVF细胞的增殖速率和成脂潜能在不同供体间存在较为中等差异。在小鼠异种移植研究中,移植后8周体积保存的量约为36%~68%,总体平均值为52%±11%。SVF中CD34^+祖细胞的含量与脂肪移植效果持久性方面存在较强的关联(P〈0.05)。结论在不同患者之间,其脂肪组织的内在生物学特性存在差异。特别是SVF中CD34^+祖细胞的浓度可能是影响脂肪移植持久性的因素之一。 | Brian J. Philips Tara L. Grahovac Jolene E. Valentin Christopher W. Chung Jacqueline M. Bliley Melanie E. Pfeifer Sohini B. Roy Stephanie Dreifuss Arta Kelmendi-Doko Russell E. Kling SudheerK. Ravuri Kacey G. Marra Vera S. Donnenberg Albert D. Donnenberg J. Peter Rubin 魏峰 高景恒 张晨 | 2014 | 中国美容整形外科杂志2014，25，4： | 0 |
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