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Integration of renewable energies, flexible loads and storages into the German power grid: Actual situationin German change of power system

Harald SCHWARZ, Xiaoshu CAI

Frontiers in Energy 2017, Volume 11, Issue 2,   Pages 107-118 doi: 10.1007/s11708-017-0470-x

Abstract: Starting from the late 1990’s, the German government decided to change the national electric power supplyThe main stimulating instrument was the German Law on Renewable Energies (Erneuerbare Energien Gesetzvery attractive over-funding, more than 1.5 million renewable generation units were connected to the Germantolerable loading of lines or transformers respectively endangers the system stability in total, are GermanTherefore, a tremendous change is needed within the German power grid.

Keywords： grid integration     renewable energies     system stability     storages     flexible loads     new market design    

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Comments on “Adaptation of Chinese and German maize-based food-feed-energy systems to limited phosphateresources—a new Sino-German international research training group”

Antje SCHWALB

Frontiers of Agricultural Science and Engineering 2019, Volume 6, Issue 4,   Pages 443-444 doi: 10.15302/J-FASE-2019288

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Adaptation of Chinese and German maize-based food-feed-energy systems to limited phosphate resources—anew Sino-German international research training group

Torsten MÜLLER, Fusuo ZHANG

Frontiers of Agricultural Science and Engineering 2019, Volume 6, Issue 4,   Pages 313-320 doi: 10.15302/J-FASE-2019282

Abstract: The new Sino-German international research training group “Adaptation of Chinese and German maize-based

Keywords： international research training group     limited resources     maize     phosphate    

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The advances of Sino-German new materials

Rongbiao Wang

Frontiers of Chemical Science and Engineering 2018, Volume 12, Issue 3,   Pages 327-328 doi: 10.1007/s11705-018-1748-1

Abstract:

Keywords： valign=     top     class=     J_zhaiyao    

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The German Energiewende and its roll-out of renewable energies: An economic perspective

Sebastian KREUZ, Felix MÜSGENS

Frontiers in Energy 2017, Volume 11, Issue 2,   Pages 126-134 doi: 10.1007/s11708-017-0467-5

Abstract: This paper gives a short overview of the German Energiewende, i.e. the transition of a large and mostly

Keywords： electricity system     renewable energy     cost-benefit analysis    

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Sclerosing cholangitis in critically ill patients: an important and easily ignored problem based on a German

Ting Lin, Kai Qu, Xinsen Xu, Min Tian, Jie Gao, Chun Zhang, Ying Di, Yuelang Zhang, Chang Liu

Frontiers of Medicine 2014, Volume 8, Issue 1,   Pages 118-126 doi: 10.1007/s11684-014-0306-6

Abstract:

Intensive care unit (ICU) is important in the rehabilitation of critically ill patients. In the past decades, many patients who received aggressive treatment in ICU developed sclerosing cholangitis in multiple centers. Sclerosing cholangitis in critically ill patients (SC-CIP) is a relatively new issue. To investigate the causes, clinical manifestation, treatment, and prognosis of SC-CIP, we searched for published cases in the databases of PubMed, Highwire, and Elsevier from 2001 to 2012. Data were extracted using a standard form and retrospectively analyzed. Twelve eligible studies covering 88 patients, with 64 men and 24 women, were enrolled in this analysis. The mean age was 49.8 years. All of the patients recovered from critical illnesses, such as trauma, infection, burn, and major surgeries. High pressure positive end-expiratory pressure (PEEP, peak level at 12.8 cm H2O) was utilized for all patients, with the average duration of 36.3 d. In addition, vasopressor agents were administered in approximately 60% of SC-CIP. A rapid increase in cholestasis and irregular strictures in the intrahepatic bile ducts was observed in the following months. With an average follow-up period of 17.9 months, poor outcomes were observed in 54 patients, including 34 deaths. In conclusion, ischemic injury of the biliary tree, which may be affected by PEEP and/or vasopressor administration, affects cholangiopathic procedure. As a newly discovered type of secondary sclerosing cholangitis, SC-CIP is a severe progressive complication of patients in ICU and should be carefully monitored by clinicians.

Keywords： intensive care unit     sclerosing cholangitis     ischemic injury     prognosis     systemic review    

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Possible role of power-to-vehicle and vehicle-to-grid as storages and flexible loads in the German 110

Erik BLASIUS

Frontiers in Energy 2017, Volume 11, Issue 2,   Pages 146-154 doi: 10.1007/s11708-017-0475-5

Abstract: flexible system integration of renewable energy sources (RES) and the support of the objectives of the GermanThe insight will be matched with the German development of the RES.

Keywords： P2V     V2G     grid integration     electric vehicles     distribution grid    

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Generating native user interfaces formultiple devices by means ofmodel transformation

Ignacio MARIN,Francisco ORTIN,German PEDROSA,Javier RODRIGUEZ

Frontiers of Information Technology & Electronic Engineering 2015, Volume 16, Issue 12,   Pages 995-1017 doi: 10.1631/FITEE.1500083

Abstract: In the last years, the types of devices used to access information systems have notably increased using different operating systems, screen sizes, interaction mechanisms, and software features. This device fragmentation is an important issue to tackle when developing native mobile service front-end applications. To address this issue, we propose the generation of native user interfaces (UIs) by means of model transformations, following the modelbased user interface (MBUI) paradigm. The resulting MBUI framework, called LIZARD, generates applications for multiple target platforms. LIZARD allows the definition of applications at a high level of abstraction, and applies model transformations to generate the target native UI considering the specific features of target platforms. The generated applications follow the UI design guidelines and the architectural and design patterns specified by the corresponding operating system manufacturer. The objective is not to generate generic applications following the lowest-common-denominator approach, but to follow the particular guidelines specified for each target device. We present an example application modeled in LIZARD, generating different UIs for Windows Phone and two types of Android devices (smartphones and tablets).

Keywords： Model-to-model transformation     Native user interfaces     Model-based user interfaces     Model-driven engineering    

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Possible role of power-to-heat and power-to-gas as flexible loads in German medium voltage networks

Mark KUPRAT, Martin BENDIG, Klaus PFEIFFER

Frontiers in Energy 2017, Volume 11, Issue 2,   Pages 135-145 doi: 10.1007/s11708-017-0472-8

Abstract: Germany’s energy transition triggered a rapid and unilateral growth of renewable energy sources (RES) in the electricity sector. With increasing shares of intermittent RES, overcapacities during periods of strong wind and photovoltaic electricity generation occur. In the face of insufficient transmission capacities, due to an inhibited network extension, the electricity generation has to be curtailed. This curtailment of RES leads to economic losses and could be avoided through flexible loads. As an option to cope with those problems, the technologies of power-to-gas (PtG) and power-to-heat (PtH) are presented in this paper. First, the alkaline electrolyzer (AEL), polymer electrolyte membrane electrolyzer (PEMEL), and solid oxide electrolyzer cell (SOEC) are investigated regarding their operational parameters. Second, the electric boiler, electrode heating boiler, and heat pumps are considered. Ultimately, the network-supporting abilities and the potential to provide ancillary services, such as control power, load sequence operation, cold start and part load capability, are compared among one another.

Keywords： power-to-gas     power-to-heat     flexible loads     ancillary services     coherent energy systems    

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Suitability of common models to estimate hydrology and diffuse water pollution in North-eastern German

Muhammad WASEEM, Frauke KACHHOLZ, Jens TRÄNCKNER

Frontiers of Agricultural Science and Engineering 2018, Volume 5, Issue 4,   Pages 420-431 doi: 10.15302/J-FASE-2018243

Abstract:

Various process-based models are extensively being used to analyze and forecast catchment hydrology and water quality. However, it is always important to select the appropriate hydrological and water quality modeling tools to predict and analyze the watershed and also consider their strengths and weaknesses. Different factors such as data availability, hydrological, hydraulic, and water quality processes and their desired level of complexity are crucial for selecting a plausible modeling tool. This review is focused on suitable model selection with a focus on desired hydrological, hydraulic and water quality processes (nitrogen fate and transport in surface, subsurface and groundwater bodies) by keeping in view the typical lowland catchments with intensive agricultural land use, higher groundwater tables, and decreased retention times due to the provision of artificial drainage. In this study, four different physically based, partially and fully distributed integrated water modeling tools, SWAT (soil and water assessment tool), SWIM (soil and water integrated model), HSPF (hydrological simulation program– FORTRAN) and a combination of tools from DHI (MIKE SHE coupled with MIKE 11 and ECO Lab), have been reviewed particularly for the Tollense River catchment located in North-eastern Germany. DHI combined tools and SWAT were more suitable for simulating the desired hydrological processes, but in the case of river hydraulics and water quality, the DHI family of tools has an edge due to their integrated coupling between MIKE SHE, MIKE 11 and ECO Lab. In case of SWAT, it needs to be coupled with another tool to model the hydraulics in the Tollense River as SWAT does not include backwater effects and provision of control structures. However, both SWAT and DHI tools are more data demanding in comparison to SWIM and HSPF. For studying nitrogen fate and transport in unsaturated, saturated, and river zone, HSPF was a better model to simulate the desired nitrogen transformation and transport processes. However, for nitrogen dynamics and transformations in shallow streams, ECO Lab had an edge due its flexibility for inclusion of user-desired water quality parameters and processes. In the case of SWIM, most of the input data and governing equations are similar to SWAT but it does not include water bodies (ponds and lakes), wetlands and drainage systems. In this review, only the processes that were needed to simulate the Tollense River catchment were considered, however the resulted model selection criteria can be generalized to other lowland catchments in Australia, North-western Europe and North America with similar complexity.

Keywords： diffuse pollution     ECO Lab     HSPF     lowland catchment     MIKE 11     MIKE SHE     modeling tools     SWAT     SWIM     Tollense River     water quality    

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Key stakeholders’ perspectives on the ideal partnering culture in construction projects

Gunnar J. LÜHR, Marian G. C. BOSCH-REKVELDT, Mladen RADUJKOVIC

Frontiers of Engineering Management 2022, Volume 9, Issue 2,   Pages 312-325 doi: 10.1007/s42524-020-0135-z

Abstract: This paper examines the current state of project cultures in the German turnkey construction industry

Keywords： project culture     organisational culture     partnering     construction culture     stakeholder perspectives     German    

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Title Author Date Type Operation

Integration of renewable energies, flexible loads and storages into the German power grid: Actual situationin German change of power system

Harald SCHWARZ, Xiaoshu CAI

Journal Article

Comments on “Adaptation of Chinese and German maize-based food-feed-energy systems to limited phosphateresources—a new Sino-German international research training group”

Antje SCHWALB

Journal Article

Adaptation of Chinese and German maize-based food-feed-energy systems to limited phosphate resources—anew Sino-German international research training group

Torsten MÜLLER, Fusuo ZHANG

Journal Article

The advances of Sino-German new materials

Rongbiao Wang

Journal Article

The German Energiewende and its roll-out of renewable energies: An economic perspective

Sebastian KREUZ, Felix MÜSGENS

Journal Article

Sclerosing cholangitis in critically ill patients: an important and easily ignored problem based on a German

Ting Lin, Kai Qu, Xinsen Xu, Min Tian, Jie Gao, Chun Zhang, Ying Di, Yuelang Zhang, Chang Liu

Journal Article

Possible role of power-to-vehicle and vehicle-to-grid as storages and flexible loads in the German 110

Erik BLASIUS

Journal Article

Generating native user interfaces formultiple devices by means ofmodel transformation

Ignacio MARIN,Francisco ORTIN,German PEDROSA,Javier RODRIGUEZ

Journal Article

Possible role of power-to-heat and power-to-gas as flexible loads in German medium voltage networks

Mark KUPRAT, Martin BENDIG, Klaus PFEIFFER

Journal Article

Suitability of common models to estimate hydrology and diffuse water pollution in North-eastern German

Muhammad WASEEM, Frauke KACHHOLZ, Jens TRÄNCKNER

Journal Article

Key stakeholders’ perspectives on the ideal partnering culture in construction projects

Gunnar J. LÜHR, Marian G. C. BOSCH-REKVELDT, Mladen RADUJKOVIC

Journal Article