检索结果-南通市图书馆

The stability of carbon from a maize-derived hydrochar as a function of fractionation and hydrothermal carbonization temperature in a Podzol

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Biochar 2022年第1期4卷 315-326页

作者： Megan de jager frank Schröter Michael Wark Luise Giani Institut für Biologie Und Umweltwissenschaften Carl Von Ossietzky Univer-sitätOldenburgGermany Institut für Chemie Carl Von Ossietzky UniversitätOldenburgGermany

Hydrochar(HC)produced by the hydrothermal carbonization(HTC)of typically wet biomass is generally considered to be less effective for carbon(C)sequestration in soils compared to biochar(BC)by pyrolysis,due to a higher content of more easily decomposable *** the recalcitrance of HC is suggested to improve with increasing HTC production temperature,the way it interacts and becomes associated with soil organic matter(SOM)fractions of different stabilities against decomposition,may also influence its effectiveness for C sequestration in *** that respect,this study aimed to verify the potential of HCs from maize silage produced at different HTC temperatures(190,210 and 230℃)for C sequestration in a HC-amended sandy loam *** do this,we conducted a pot trial experiment and traced the fate of HC-derived C(HC-C)within different SOM fractions,namely the free-and occluded particulate organic matter(POMf and POMO,respectively)fractions and that comprising organic matter(OM)bound to clays(OMCl).Approx.1 year after applying 5%of the different HTC temperature HCs to the soil,the SOM fractions were isolated by density fractionation for each HC treatment(HC190,HC210 and HC230)and the control(absent of HC).All fractions and the HCs were analyzed for organic C(OC)content and isotopic signatures(δ^(13)C).from the δ^(13)C signatures,the amount of HC-C and native soil organic carbon(SOC)within each fraction was *** C contents and decreased H/C and O/C ratios were observed with increasing HTC production temperatures,which sug-gests a lower stability for the low temperature *** ca.1 year,a loss of~20-23%of the bulk soil TOC was found in the HC-amended *** POMf fraction of the HC-amended soils showed losses of 68-81%HC-C and 52-72%native SOC,which may be due to a positive priming effect caused by HC *** POM_(O) and OM_(Cl) fractions of the HC-amended soils contained more OC than the control,indicating the integration of HC-C together wi

关键词： Hydrochar Carbon sequestration Carbon stabilization Soil organic matter fractions Soil density fractionation δ^(13)C analysis

An investigation of the effects of hydrochar application rate on soil amelioration and plant growth in three diverse soils

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Biochar 2021年第3期3卷 349-365页

作者： Megan de jager Luise Giani Carl Von Ossietzky Universität Institut Für Biologie Und UmweltwissenschaftenOldenburgGermany

The hydrothermal carbonization(HTC)of biogas digestate alters the raw materials inherent characteristics to produce a carbon(C)-rich hydrochar(HC),with an improved suitability for soil *** studies report conflicting impacts of various HC application rates on soil properties and plant *** this study,the influence of HC application rate on soil improvement and plant growth aspects was investigated in three diverse soils(Chernozem,Podzol,and Gleysol).Pot trials were conducted in which all soils were amended with 5,10,20 and 30%(w/w)HC in quintuplicate,with two controls of pure soil(with and without plants,respectively)also *** to potting,soil samples were collected from all HC-amended soils and controls and analyzed for soil pH,plant available nutrients(PO4-P and K),and microbial activity using standard laboratory and statistical *** after potting,a 6-week seed germination experiment using Chinese cabbage was conducted to determine germination success,followed by a plant growth experiment of equal duration and plant species to determine biomass *** the end of the study(after a total plant growth period of 12 weeks),each pot was sampled and comparatively analyzed for the same soil properties as at the beginning of the *** pH shifted toward the pH of the HC(6.6)in all soils over the course of the study,but was most expressed in the 20%and 30%application rates,confirming the well-documented liming effect of *** addition of HC increased the PO4-P and K contents,particularly with 20%and 30%HC *** results are proposedly due to the large labile C fraction of the HC,which is easily degradable by *** rapid decomposition of this C fraction prompted the quick release of the HCs inherently high PO4-P and K content into the soil,and in turn,further stimulated microbial activity,until this fraction was essentially *** addition did not inhibit seed germination at any rate,presumabl

关键词： Biogas digestate Hydrochar application rate Soil improvement Nutrient availability Microbial activity

The influence of hydrochar from biogas digestate on soil improvement and plant growth aspects

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Biochar 2020年第2期2卷 177-194页

作者： Megan de jager Michael Rohrdanz Luise Giani Carl Von Ossietzky Universitat Institut für Biologie und UmweltwissenschaftenOldenburgGermany

Hydrochar(HC),produced by hydrothermal carbonization,offers technical advantages over biochar(BC)produced by pyrolysis,and is suitable for soil amelioration,carbon sequestration,and enhanced plant *** grain size has been shown to influence nutrient retention,microbial colonization and aggregate formation;however,similar research for HC is *** trials were conducted to investigate the influence of HC grain size[coarse(6.3-2 mm),medium(2-0.63 mm)and fine(from biogas digestate,for soil improvement in three soils:loamy Chernozem,sandy Podzol,and clayey Gleysol,at a 5%HC application rate(w/w).All soils including two controls(with and without plants)were analysed for water holding capacity(WHC),cation exchange capacity(CEC),wet aggregate stability,pH,plant available nutrients(PO_(4)-P,K and N_(min))and germination and biomass success using standard laboratory and statistical *** pH showed a compensatory shift toward the HC pH(7.2)in all soils over the course of the *** example,the pH of the medium grained HC treatment for the Chernozem decreased from 7.9 to 7.2 and increased in the Podzol and Gleysol from 5.9 to 6.1 and 4.9 to 5.5,*** nutrient-rich HC(2034±38.3 mg kg^(−1) PO_(4)-P and 2612.5±268.7 mg kg^(−1) K content)provided only a short-term supply of nutrients,due to the relatively easily mineralized fraction of HC,which allowed for quick nutrient *** pH and PO_(4)-P effects were most pronounced in the fine grained HC treatments,with a~87%,~308%and~2500%increase in PO_(4)-P content in the Chernozem,Podzol and Gleysol,respectively,compared to the controls at the beginning of the *** same trend was observed for the K and NH_(4)^(+)content in the fine and medium grained HC treatments in all *** seed germination inhibition of Chinese cabbage was observed,with average germina-tion rates>50%in all *** effect on NO_(3)^(−)content was indeterminable,while there was little to no effect on biom

关键词： Hydrochar Soil improvement Grain size Plant available nutrients

Retrospect and prospect: 30 years of formula conferences!

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Particuology 2019年第3期17卷 3-6页

作者： Alain Durand Jordi Esquena Ning Yang Guanghui Ma Ying Ren frank Kleine jager Bernd Sachweh Universite de Lorraine CNRS LCPM F-54000 Nancy France Institute of Advanced Chemistry of Catalonia CSIC 08034 Barcelona Spain Institute of Process Engineering Chinese Academy of Sciences Beijing 100190 China BASf SE 67056 Ludwigshafen Germany BASf Advanced Chemicals Co. Ltd. No 300 Shanghai 20013乙 China

The history of formula conferences was summarized with a particular focus on formula I and formula Ⅸ (the first and last conferences of the series).The foundation of formulation during the middle of the 1980s by people from academia and industry in the fields of chemistry and chemical engineering was briefly *** current trends in formulation as well as in product engineering were listed.

关键词： formulation Engineering Product formula conferences

仔猪出生重及在哺乳期加喂代乳品对仔猪断乳前后生长性能及屠体品质的影响

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

国外畜牧学（猪与禽） 2003年第2期23卷 6-9页

作者：米海峰 B.f.wolter 美国伊利诺斯大学动物科学系

前言现已证明,仔猪的断奶体重对于其以后的生长性能具有显著影响.例如,Kavanagh等(1997)和Mahan等(1998)证实,与断奶体重高的仔猪相比,断奶体重低的仔猪增重率较低,并且达到屠宰体重所需的时间更长.此外,断奶时一群猪中体重差异过大的... 详细信息

前言现已证明,仔猪的断奶体重对于其以后的生长性能具有显著影响.例如,Kavanagh等(1997)和Mahan等(1998)证实,与断奶体重高的仔猪相比,断奶体重低的仔猪增重率较低,并且达到屠宰体重所需的时间更长.此外,断奶时一群猪中体重差异过大的话会危害商品猪生产系统的生产率,尤其会危害实行全进全出式管理模式的猪场的生产率(Hardy,1998).

关键词：仔猪出生重哺乳期代乳品生长性能屠体品质

维普期刊数据库

在线全文

学校读者我要写书评

暂无评论

猪群大小对生长性能的影响

国外畜牧学（猪与禽） 2002年第4期22卷 22-24页

作者：黎丽瑛 B.f.wolter M.Ellis 美国伊利诺斯大学动物科学系

人们非常有兴趣于对生长肥育猪进行大群饲养 (每群 1 0 0头甚至更多 ) ,以这一手段来降低每头猪分摊的建筑和设备的成本。然而 ,历史上关于猪群大小对生产性能影响的数据是以每群 2 0～ 3 0头猪为基础的。本报告简述了最近进行于美国伊... 详细信息

人们非常有兴趣于对生长肥育猪进行大群饲养 (每群 1 0 0头甚至更多 ) ,以这一手段来降低每头猪分摊的建筑和设备的成本。然而 ,历史上关于猪群大小对生产性能影响的数据是以每群 2 0～ 3 0头猪为基础的。本报告简述了最近进行于美国伊利诺斯大学和其它一些地方的研究 ,其结果表明 ,每群多达 1 0 0头的大群猪与每群 2 0头左右的常规大小的猪群相比 ,对保育期仔猪的生长性能而非对生长肥育猪有不利影响。最终 ,最适当的猪群大小应该根据生产成本高低以及是否易于管理来决定。有趣的是 ,最经济的猪群大小可能随着猪体重的不同而不同。

关键词：猪群大小生长性能每猪占地面积现代养猪生产体系

维普期刊数据库

“frena”,一个在高噪声电平下传输语言的系统

在线全文

学校读者我要写书评

暂无评论

电信科学 1958年第4期 44-52页

作者： f.de jager J.A.Greefkes 沈肇熙

以往发展电信着重在例如采用调频或脉码调制系统来改进电路质量。行动装置中往往努力于达到另一种目的:时常所接收的信号只能符合于最低限度的质量要求,信号强度使传来的语言恰好只能听得懂,但要求即使在噪扰电平极高的情形下也还保持... 详细信息

以往发展电信着重在例如采用调频或脉码调制系统来改进电路质量。行动装置中往往努力于达到另一种目的:时常所接收的信号只能符合于最低限度的质量要求,信号强度使传来的语言恰好只能听得懂,但要求即使在噪扰电平极高的情形下也还保持语言能够被听得懂;也就是要在发射的电功率极低或达到的距离极远,或兼有这两种情况的条件下完成通信。

关键词：噪声电平 frena 信号噪声频带宽度波道脉码调制行动装置噪声比接收端导频信号

维普期刊数据库

Adequate Diagnostic Performance of Combined [¹⁸f]-fluormethylcholine PET-CT with Diffusion-Weighted MRI in Primary Staging of High Risk Prostate Cancer

在线全文

学校读者我要写书评

暂无评论

Advances in Molecular Imaging 2016年第1期6卷 1-9页

作者： Pieter L. jager R. Jorn Beukinga Tjard D. de Haan Martijn f Boomsma Ben E. Laddé Miranda van t Veer-ten Kate Ad H. J. Oostdijk Martijn G. Steffens Department of Nuclear Medicine Zwolle Netherlands Department of Urology Zwolle Netherlands Department of Radiology Zwolle Netherlands Department of Pathology Zwolle Netherlands

Introduction: [18f]-fluoro-methylcholine (fCH) PET/CT and MRI with diffusion-weighted MRI (DW-MRI) have insufficient performance in lymph node staging of primary prostate cancer by themselves, but the combination may perform better. We aim to prospectively determine the diagnostic performance of combined fCH PET and MRI for lymph node staging. Methods: This was a single site study of diagnostic accuracy in a well-defined group of 21 consecutive high-risk primary prostate cancer patients (>30% chance of lymph node metastases) in a large community hospital. We performed fCH PET/CT and MRI with DW-MRI prior to endoscopic extended pelvic lymph node dissection (EPLND). PET was fused and interpreted together with various MRI image sets (T1, T2, DWIBS) and was only scored positive when a lymph node seen on MRI coincided with increased focal fCH uptake on PET. findings were compared with detailed histological evaluation, on a per-patient and per-region level. We calculated sensitivity, specificity, positive and negative predictive value of combined PET-MRI. Results: 14 out of 21 patients had metastatic lymph nodes with 37 out of 164 evaluable regions harboring metastases. On a per-patient analysis, PET-MRI had a sensitivity/specificity of 79/100% with a PPV/NPV of 100/77%. On a per-region analysis (n = 164) these figure were 65/99% and 96/91%, respectively. Conclusions: Combined DW-MRI and fCH PET/CT has a very high positive predictive value in high risk prostate cancer patients. If confirmed in larger series a positive combined scan may safely allow cancellation of surgical staging in selected patients, depending on local protocols in N1 M0 patients.

关键词： Positron Emission Tomography Diffusion-Weighted Imaging fluor-Methyl-Choline Prostate Cancer Primary Staging

舒尼替尼治疗的肾透明细胞癌病人经CT检查肠壁水肿的发生率及其与腹泻的相关性

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

国际医学放射学杂志 2015年第2期 197-198页

作者： L.Cornelissen f.Claus P.wolter H.Dumez f.De Keyzer E.Lerut 郭凌飞 Cornelisse Radiology Department of Imaging & Pathology University Hospitals Leuven KU Leuven Herestraat 49 3000 Leuven Belgium

摘要目的本研究摘要目的是回顾性评估舒尼替尼治疗的肾透明细胞癌(RCC)病人经CT检查肠壁水肿的发生率及其与腹泻的相关性。方法对2005年1月—2011年12月所有

关键词：舒尼替尼肠壁水肿肾透明细胞癌发生率病人 CT 相关性