| Records |
| Author |
Klock, H.; Külls, C.; Udluft, P. |
| Title |
Estimating recharge values using hydrochemical and geological data: a case study from the |
Type |
Conference Article |
| Year |
2001 |
Publication |
Impact of Human Activity on Groundwater Dynamics: Proceedings of an International Symposium (Symposium S3) Held During the Sixth Scientific Assembly of the International Association of Hydrological Sciences (IAHS) at Maastricht, The Netherlands, from 18 t |
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Issue |
269 |
Pages  |
25 |
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International Assn of Hydrological Sciences |
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THL @ christoph.kuells @ Klock2001estimating |
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60 |
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| Author |
Edmunds, W.M.; Shand, P.; Hart, P.; Ward, R.S. |
| Title |
The natural (baseline) quality of groundwater: a UK pilot study |
Type |
Journal Article |
| Year |
2003 |
Publication |
Science of The Total Environment |
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| Volume |
310 |
Issue |
1 |
Pages |
25-35 |
| Keywords |
Baseline quality, Groundwater, Hydrogeochemistry, Monitoring, Water Policy |
| Abstract |
Knowledge of the natural baseline quality of groundwaters is an essential prerequisite for understanding pollution and for imposing regulatory limits. The natural baseline of groundwaters may show a range of concentrations depending on aquifer mineralogy, facies changes, flow paths and residence time. The geochemical controls on natural concentrations are discussed and an approach to defining baseline concentrations using geochemical and statistical tools is proposed. The approach is illustrated using a flowline from the Chalk aquifer in Berkshire, UK where aerobic and anaerobic sections of the aquifer are separately considered. The baseline concentrations for some elements are close to atmospheric values whereas others evolve through time-dependent water–rock interaction. Certain solutes (K, NH4+), often considered contaminants, reach naturally high concentrations due to geochemical controls; transition metal concentrations are generally low, although their concentrations may be modified by redox controls. It is recommended that the baseline approach be incorporated into future management strategies, notably monitoring. |
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0048-9697 |
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THL @ christoph.kuells @ edmunds_natural_2003 |
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166 |
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Li, X.; Shen, K.; Li, Q.; Deng, Y.; Zhu, P.; Wang, D. |
| Title |
Roll-over behavior in current-voltage curve introduced by an energy barrier at the front contact in thin film CdTe solar cell |
Type |
Journal Article |
| Year |
2018 |
Publication |
Solar Energy |
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| Volume |
165 |
Issue |
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Pages |
27-34 |
| Keywords |
AlO HRT layer, Band alignment, CdTe solar cell, Roll-over behavior |
| Abstract |
Roll-over phenomenon in the current–voltage (J–V) curve is often observed in a CdTe thin film solar cell. The roll-over phenomenon, which is occurred near the open-circuit voltage in a light J–V curve, is due to Schottky energy barrier formed at the CdTe/metal interface in a CdTe solar cell back contact. In this study we report a J–V roll-over phenomenon which is induced by an energy barrier at the front contact of a CdTe solar cell. Two kinds of oxides, namely, Al2O3 and SnO2, were deposited as high-resistance transparent (HRT) layer between the window layer CdS and the fluorine doped tin oxide (FTO) front electrode in CdTe solar cells. These two oxides present much different electronic band alignment with FTO and CdS. SnO2 formed almost no energy barrier with CdS, this allowed smooth transport for photo-generated electrons from CdTe to CdS and FTO. However, Al2O3 formed a high energy barrier with CdS. The rather high energy barrier with a value of 3.43 eV at the CdS/Al2O3 interface induced a J–V roll-over phenomenon in a CdTe thin film solar cell, which dramatically led to a quick decrease for the cell device efficiency. The electron transport at the FTO/Al2O3/CdS interface is governed by tunneling effect. The results presented in this study demonstrate that the band structure at the front electrode plays an important role for the performance of a CdTe thin film solar cell. |
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0038-092x |
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THL @ christoph.kuells @ li_roll-over_2018 |
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187 |
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| Author |
Zagana, E.; Külls, C.; Udluft, P. |
| Title |
Der Wasserhaushalt des Aliakmonas |
Type |
Journal Article |
| Year |
2000 |
Publication |
Vom Wasser |
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| Volume |
94 |
Issue |
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Pages |
29-39 |
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THL @ christoph.kuells @ Zagana2000saa |
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34 |
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Külls, C.; Haering, M.; Leistert, H.; Oster, H. |
| Title |
Hydrological, physical and chemical constraints for groundwater age dating with CFC and SF6 |
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G-DAT 2008-Leipzig |
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29 |
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THL @ christoph.kuells @ Kuells2008hydrological |
Serial |
57 |
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