维普中文期刊产品整合服务
1165篇 您的检索式:作者名="Schnell"
    题名 作者 年代 出处 被引量
1纯培养条件下不同氧化铁的微生物还原能力显示文摘The microbial reduction of ferrihydrite,lepidocrocite,hematite,goethite and aluminum-substituted iron oxides were examined by iron-reducer GS-15 under anaerobic pure culture condition.The results indicated that the ferrihydrite and lepidocrocite can be rapidly reduced by iron-reducer,and the percentage of microbial reduction are respectively 95.4% and 95.8% after 4 days incubation at 25℃.The other iron oxides like hematite,Al-hematite,goethite and Al-goethite are very difficult to reduce during short-term incubation.The amounts of Fe(Ⅲ)-reducing,Fe(Ⅱ)-producing and Fe-reducing calculated by acetate consumption are identical under the conditions of lower concentration iron oxides addition.曲东 Sylvia Schnell 2001微生物学报2001,41,6:45
2水稻土中铁氧化物的厌氧还原及其对微生物过程的影响显示文摘采用厌氧泥浆恒温培养实验 ,测定了添加 6种外源氧化铁后土壤中Fe(Ⅱ )和Fe(Ⅲ )浓度的变化 ,探讨了不同氧化铁的还原能力及其对土壤产H2 、产CO2 、产乙酸和产CH4 过程的影响。结果表明 :无定形氧化铁和纤铁矿易于被还原 ,两者的最终还原程度大体相同 ,但无定形氧化铁存在还原滞后现象 ;针铁矿、赤铁矿、Al取代针铁矿和Al取代赤铁矿难以被还原 ,表现出与对照相同的还原特征 ;铁还原能导致土壤中H2 和乙酸稳态浓度的降低 ,有效抑制了甲烷产生 ;添加Fe(OH) 3和纤铁矿后 ,Fe(Ⅲ )还原占总电子传递的贡献率由对照的 1 8.3 0 %增至 63 .3 2 %和 46.90 % ,而形成甲烷的电子传递贡献率由对照的 80 .92 %降至 3 5 .85 %和 5 2 .3 2 % ,Fe(Ⅲ )还原对电子的竞争消耗 。曲东 张一平 Schnell S Conrad R 2003土壤学报2003,40,6:40
3外源氧化铁对水稻土甲烷形成的抑制显示文摘通过添加不同氧化铁的土壤泥浆厌氧恒温培养实验发现 ,无定形氧化铁和纤铁矿能显著的降低水稻土中的H2 和乙酸浓度 ,并导致甲烷形成被抑制 .易还原氧化铁可使H2 的稳态浓度由对照的 2— 4mg m3 降低到 0 3— 1 0mg m3 ,并使得体系的Gibb’s自由能 (ΔGH)增大到 - 10kJ mol,从而有效地抑制了依赖H2 营养的产甲烷过程 .添加氧化铁同样能消耗体系中的乙酸 ,使乙酸浓度明显低于对照 。曲东 Sylvia Schnell 2002环境科学学报2002,22,1:22
4The yin and yang of co-inhibitory receptors: toward anti-tumor immunity without autoimmunity显示文摘Co-inhibitory receptors are important regulators of TAlexandra Schnell Lloyd Bod Asaf Madi Vijay K.Kuchroo 2020Cell Research2020,30,4:10
5短期淹水培养对水稻土中地杆菌和厌氧粘细菌丰度的影响显示文摘模拟水稻土淹水过程,采用Real-time PCR技术测度了不同水稻土中地杆菌(Geobacteraceae spp.)和厌氧粘细菌(Anaeromyxobacter spp.)在不同淹水时期16S rDNA拷贝数的变化,比较了地杆菌和厌氧粘细菌丰度与培养过程中微生物Fe(Ⅲ)还原的关系。结果表明,在4类稻作区采集的水稻土样品中,Fe(Ⅲ)还原潜势有明显的区别,表现出由北向南逐渐降低的趋势。从淹水12 h的地杆菌和厌氧粘细菌拷贝数变化看出,采自浙江和天津的水稻土样品对淹水过程具有高度敏感性,而采自吉林和广西的水稻土样品对淹水响应不敏感。在17 d的短期淹水培养中,地杆菌丰度明显高于厌氧粘细菌,表明地杆菌对水稻土中铁还原的贡献大于厌氧粘细菌。地杆菌和厌氧粘细菌拷贝数总体上表现出在11 d时达到峰值,17 d时显著下降。吉林水稻土中地杆菌丰度在5 d时达到38.3%,与其最大铁还原速率到达时间(TVmax)为4.07 d相对应,表明地杆菌对其铁还原过程具有重要贡献。四川水稻土中地杆菌和厌氧粘细菌丰度均较低,暗示其他兼性铁还原菌对其铁还原的作用值得重视。朱超 Stefan Ratering 曲东 Sylvia Schnell 2011生态学报2011,31,15:10
6煤粉燃烧中NO_x和SO_x生成的详细反应机理模拟显示文摘采用详细化学反应机理与CFD方法耦合的煤粉燃烧数值模拟程序,计算了煤粉燃烧过程中CO,NO_x和SO_x等的浓度分布特性.通过与实验对照,验证了数值模拟方法的可靠性,并分析了燃烧温度和煤粉细度等因素对于NO生成的影响.结果表明温度对于NO的生成影响较大,随着温度的增加,NO的生成浓度明显增加;对于不同煤种,可能存在一个温度点,这时NO的生成速率将非常快;在计算范围内,温度对SO_2的最终生成浓度没有明显影响,而只影响SO_2的释放过程.煤粉细度对于NO生成有较小的影响.魏小林 韩小海 Uwe Schnell Günter Scheffknecht Benedetto Risio 2008力学学报2008,40,6:8
7Use of models in large-area forest surveys: comparing model-assisted, model-based and hybrid estimation显示文摘This paper focuses on the use of models for increasing the precision of estimators in large-area forest surveys.It is motivated by the increasing availability of remotely sensed data,which facilitates the development of models predicting the variables of interest in forest surveys.We present,review and compare three different estimation frameworks where models play a core role:model-assisted,model-based,and hybrid estimation.The first two are well known,whereas the third has only recently been introduced in forest surveys.Hybrid inference mixes designbased and model-based inference,since it relies on a probability sample of auxiliary data and a model predicting the target variable from the auxiliary data.We review studies on large-area forest surveys based on model-assisted,modelbased,and hybrid estimation,and discuss advantages and disadvantages of the approaches.We conclude that no general recommendations can be made about whether model-assisted,model-based,or hybrid estimation should be preferred.The choice depends on the objective of the survey and the possibilities to acquire appropriate field and remotely sensed data.We also conclude that modelling approaches can only be successfully applied for estimating target variables such as growing stock volume or biomass,which are adequately related to commonly available remotely sensed data,and thus purely field based surveys remain important for several important forest parameters.Goran Stahl Svetlana Saarela Sebastian Schnell Soren Holm Johannes Breidenbach Sean P. Healey Paul L. Patterson Steen Magnussen Erik Naesset Ronald E. McRoberts Timothy G. Gregoire 2016Forest Ecosystems2016,3,2:7
8Adaptive nonlinear model predictive control design of a flexible-link manipulator with uncertain parameters显示文摘This paper presents a novel adaptive nonlinear model predictive control design for trajectory tracking of flexible-link manipulators consisting of feedback linearization, linear model predictive control, and unscented Kalman filtering. Reducing the nonlinear system to a linear system by feedback linearization simplifies the optimization problem of the model predictive controller significantly, which,however, is no longer linear in the presence of parameter uncertainties and can potentially lead to an undesired dynamical behaviour. An unscented Kalman filter is used to approximate the dynamics of the prediction model by an online parameter estimation, which leads to an adaptation of the optimization problem in each time step and thus to a better prediction and an improved input action. Finally,a detailed fuzzy-arithmetic analysis is performed in order to quantify the effect of the uncertainties on the control structure and to derive robustness assessments. The control structure is applied to a serial manipulator with two flexible links containing uncertain model parameters and acting in threedimensional space.Fabian Schnelle Peter Eberhard 2017Acta Mechanica Sinica2017,33,3:5
9外源氧化铁对水稻土中有机酸含量的影响显示文摘在水稻土泥浆中添加Fe(OH) 3 可显著降低乙酸浓度 .在新鲜水稻土样品中 ,由于添加Fe(OH) 3导致对乙酸的竞争消耗 ,在培养 5d后 ,乙酸浓度降至 10~ 2 0 μmol·L-1的稳态浓度 ,而此刻对照中的乙酸浓度仍在 12 0 0 μmol·L-1以上 .在乙酸产生量较低的土壤中 ,添加Fe(OH) 3 可完全消耗体系中的乙酸 ,并导致产CH4过程的完全被抑制 .添加纤铁矿同样可使乙酸浓度显著减少 ,但作用效果不如无定形氧化铁 .添加赤铁矿可造成培养初期 (10d以内 )乙酸的大量积累 ,但并不引起产CH4量的增大 .添加Fe(OH) 3 、纤铁矿及铝取代针铁矿 ,能引起厌氧培养的水稻土中丙酸浓度的降低 ,其抑制效率为Fe(OH) 3 >纤铁矿 >铝取代针铁矿 .新鲜土样和经过 11周厌氧处理后的土样中 ,有机酸种类和含量有较大差别 .曲东 Sylvia Schnell Rolf Conrad 2002应用生态学报2002,13,11:5
10Comparison of estimators of variance for forest inventories with systematic sampling-results from artificial populations显示文摘Background:Large area forest inventories often use regular grids(with a single random start)of sample locations to ensure a uniform sampling intensity across the space of the surveyed populations.A design-unbiased estimator of variance does not exist for this design.Oftentimes,a quasi-default estimator applicable to simple random sampling(SRS)is used,even if it carries with it the likely risk of overestimating the variance by a practically important margin.To better exploit the precision of systematic sampling we assess the performance of five estimators of variance,including the quasi default.In this study,simulated systematic sampling was applied to artificial populations with contrasting covariance structures and with or without linear trends.We compared the results obtained with the SRS,Matern’s,successive difference replication,Ripley’s,and D’Orazio’s variance estimators.Results:The variances obtained with the four alternatives to the SRS estimator of variance were strongly correlated,and in all study settings consistently closer to the target design variance than the estimator for SRS.The latter always produced the greatest overestimation.In populations with a near zero spatial autocorrelation,all estimators,performed equally,and delivered estimates close to the actual design variance.Conclusion:Without a linear trend,the SDR and DOR estimators were best with variance estimates more narrowly distributed around the benchmark;yet in terms of the least average absolute deviation,Matern’s estimator held a narrow lead.With a strong or moderate linear trend,Matern’s estimator is choice.In large populations,and a low sampling intensity,the performance of the investigated estimators becomes more similar.Steen Magnussen Ronald EMcRoberts Johannes Breidenbach Thomas Nord-Larsen Göran Ståhl Lutz Fehrmann Sebastian Schnell 2020Forest Ecosystems2020,7,2:2
11Bosch公司180MPa电磁阀式共轨喷油器显示文摘电磁阀技术在共轨喷油器中经数百万次使用证实,其性能可靠。这种技术为进一步提高喷油压力和优化多次喷射能力提供了潜力。介绍了Bosch180MPa的CR12.5共轨喷油器,它装备了一种新型的电磁阀。Leonhard R 2010国外内燃机2010,,6:2
12Size-dependent structural and magnetic properties of chemically synthesized Co-Ni-Ga nanoparticles显示文摘形状记忆材料的阶段转变和磁性能被调节成分材料的尺寸定制,例如 nanoparticles。由于为控制尺寸的 Heusler nanoparticles 的合适的合成方法的缺乏,然而,他们的性质和功能的尺寸依赖上没有报告。在这贡献,我们在场选择尺寸的 Co-Ni-Ga Heusler nanoparticles 的第一化学合成。我们也在 30-84 nm 的范围与尺寸报导 biphasic Co-Ni-Ga nanoparticles 的结构和磁性,由一条 SBA-15 nanoporous silicatemplated 途径准备了。粒子尺寸能被控制装载和先锋的集中乐意地调节。部分和 Co-Ni-Ga nanoparticles 的每个阶段的雏晶尺寸是仔细与他们的粒子尺寸有关。提高的磁化和减少的 coercivity 与增加粒子尺寸被观察。居里温度(T Co-Ni-Ga nanoparticles 的 c ) 也取决于他们的尺寸。84 个缩放 nm 的粒子展出最高的 T 在所有已知的 Heusler 之中的 c (1,174 K ) 加重。Co-Ni-Ga nanoparticles 的高级居里温度显示他们在高温度的形状记忆为申请答应候选人基于合金的设备。Changhai Wang Aleksandr A. Levin Julie Karel Simone Fabbrici Jinfeng Qian Carlos E. ViolBarbosa Siham Ouardi Franca Albertini Walter Schnelle Jan Rohlicek Gerhard H. Fecher Claudia Felser 2017Nano Research2017,10,10:2
13Ferrous iron oxidation by anoxygenic phototrophic bacteria 显示文摘Widdei F Schnell S Heising S 1993Nature1993,362,6423:1
14Aliskiren, a novel, orally effec- tive nmin inhibitor, lowers blood pressure in rnannosets and spontaneous- ly hypertemive rats显示文摘Wood JM Schnell CR Cumin F 2005J Hypertens2005,23,2:1
15Contactless conductivity detection for capillary electrophoresis显示文摘Zemann A J Schnell E Volgger D 1998Anal Chem1998,70,3:1
16Ant community succession within eucalypt plantations on used pasture and implications for taxonomic sufficiency in biomonitoring显示文摘Schnell M R Pik A J Dangerfield J M 2003Austral Ecology2003,28,:1
17Effects of soy isoflavone consumption on bone structure and milk mineral concentra-tion in a rat model of lactation-associated bone loss显示文摘Peterson C A Schnell J D Kubas K L 2009EuropeanJournal of Nutrition2009,48,2:1
18Alpha-glucosidase inhibitors 2012-cardiovas- cular considerations and trial evaluation 显示文摘Standl E Schnell O 2012Diab Vasc Dis Res2012,9,3:1
19A multiscale mathematical model of canc-er,and its use in analyzing irradiation therapies显示文摘Ribba B Colin T Schnell S 0,,07:1
20Personality and meaning in life显示文摘Tatjana Schnell Peter Becker 2006Personality and Individual Differences2006,,1:1
返回顶部 每页显示:
共59页 首页 上一页 第1页 下一页 末页 /59 跳转

网站首页 | 关于我们 | 联系我们 | 产品服务 | 客服中心 | 广告服务 | 版权声明 | 网站联盟 | 友情链接 | 售卡网点

版权所有© 渝B2-20050021-1 渝公网安备 50019002500403号 违法和不良信息举报中心

互联网出版许可证 新出网证(渝)字10号 全国400电话 - 免长途话费