@article{OttoAlipoursarbaniTorrentetal.2023, author = {Otto, Pascal and Alipoursarbani, Mozhdeh and Torrent, Daniel and Latorre-P{\´e}rez, Adriel and Paust, Thomas and Albert, Alfred and Abendroth, Christian}, title = {Microbiome characterization after aerobic digestate reactivation of anaerobically digested sewage sludge}, doi = {10.3390/fermentation9050471}, year = {2023}, abstract = {A demonstrator plant of a recently patented process for improved sludge degradation has been implemented on a municipal scale. In a 1500 m3 sewage sludge digester, an intermediary stage with aerobic sewage sludge reactivation was implemented. This oxic activation increased the biogas yield by up to 55\% with a 25\% reduction of the remaining fermentation residue volume. Furthermore, this process allowed an NH4-N removal of over 90\%. Additionally, 16S rRNA gene amplicon high-throughput sequencing of the reactivated digestate showed a reduced number of methane-forming archaea compared to the main digester. Multiple ammonium-oxidizing bacteria were detected. This includes multiple genera belonging to the family Chitinophagaceae (the highest values reached 18.8\% of the DNA sequences) as well as a small amount of the genus Candidatus nitrosoglobus (<0.3\%). In summary, the process described here provides an economically viable method to eliminate nitrogen from sewage sludge while achieving higher biogas yields and fewer potential pathogens in the residuals.}, subject = {Anaerobic digestion; Anaerobic microbiomes; Aerobic sludge activation; 16S rRNA sequencing; Water treatment; Belebtschlammverfahren; Schlammfaulung; Mikroorganismus; G{\"a}rung; Biogas; Stickstoff-Elimination; Anaerobe Verg{\"a}rung; Anaerobe Mikrobiome; Aerobe Schlammaktivierung; 16S-rRNA-Sequenzierung; Wasserversorgung}, language = {en} } @article{CelikAtapekPolatetal.2023, author = {{\c{C}}elik, G{\"u}l{\c{s}}ah Akta{\c{s}} and Atapek, Şaban Hakan and Polat, Şeyda and Obrosov, Aleksei and Weiß, Sabine}, title = {Nitriding effect on the tribological performance of CrN-, AlTiN-, and CrN/AlTiN-Coated DIN 1.2367 hot work tool steel}, doi = {10.3390/ma16072804}, year = {2023}, abstract = {In this study, heat-treated and multisurface engineered DIN 1.2367 tool steel was subjected to room and elevated temperature wear tests, and the effect of nitriding on its tribological behavior was investigated. CrN, AlTiN, and CrN/AlTiN coatings with a total thickness of 2 µm were obtained by arc cathodic physical vapor deposition on conventional heat-treated and gas-nitrided steels. The white layer formed during nitriding was removed, and a diffusion layer (100 µm) was achieved in the cross section of the steel having a tempered martensitic matrix. The highest surface hardness was attained with an integral coating (CrN/AlTiN), and surface hardness increased even more after nitriding due to the formation of a multicomponent ceramic layer on top of the diffusion layer. The room temperature wear tests performed against an alumina counterpart revealed that (i) CrN/AlTiN-coated steel had the highest friction coefficient of 0.26, which further increased to 0.33 by nitriding due to the increase in shear strength, and that (ii) with increasing surface hardness, the specific wear rates (W) of the heat-treated and coated steels could be ranked as follows: WCrN/AlTiN < WAlTiN < WCrN. The wear rates decreased when nitriding was carried out prior to coating. In order to simulate the aluminum extrusion conditions, hot wear behavior of the surfaces against AA6080 alloy at 450 °C was investigated. The hot wear tests revealed that (i) high friction coefficients were reached due to the adhesive characteristic of aluminum to the surfaces, (ii) the nitrided and CrN/AlTiN-coated sample exhibited the lowest wear rate among all studied surfaces, and (iii) the film damage on the worn surfaces mostly occurred in the form of droplet delamination.}, subject = {DIN 1.2367; PVD coating; Wear; Characterization; PVD-Beschichtung; Verschleiß; Charakterisierung; Werkzeugstahl; Warmarbeitsstahl; Nitrierh{\"a}rten; Tribologie; Werkzeugpr{\"u}fung; Verschleiß}, language = {en} } @misc{OPUS4-6351, title = {Amtliches Mitteilungsblatt der BTU Cottbus-Senftenberg, 2023,08 (27.06.2023)}, doi = {10.26127/BTUOpen-6351}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:co1-opus4-63512}, year = {2023}, abstract = {Leitlinie zur Informationssicherheit an der Brandenburgischen Technischen Universit{\"a}t Cottbus-Senftenberg}, language = {de} } @phdthesis{Ulbricht2022, author = {Ulbricht, Alexander}, title = {Multi-scale correlation between defects and internal stresses in additively manufactured AISI316L structures}, doi = {10.26127/BTUOpen-6374}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:co1-opus4-63746}, school = {BTU Cottbus - Senftenberg}, year = {2022}, abstract = {Additive Manufacturing of metals has become relevant for industrial applications. The near net-shape production of components produced by Laser Powder Bed Fusion (PBF-LB/M) enables new possibilities in component design combined with a reduction of the amount of needed material. Omitting the extra material, that was part of conventionally produced components due to machining constraints, results in components which in consequence lack the inherent additional safety margins provided by the higher material consumption of conventionally produced components. Therefore, to use PBF-LB/M metals in safety critical applications an in-depth understanding of porosity and internal stresses in parts made by PBF-LB/M is needed. Only non-destructive testing methods—such as computed tomography and residual stress analysis using neutrons—enable the assessment of porosity and stresses in the whole part. In this thesis I tackled creep and tensile static deformed specimens to fill research gaps in this field in terms of analysing PBF-LB/M stainless steel AISI 316L: from structural properties to in-situ behaviour. The initial void population of AISI 316L is studied using X-ray and synchrotron micro computed tomography. Specimens produced with different process parameters were analysed to quantify the influence of process parameters on the initial void population. The possibility to close voids using the laser illumination of subsequent layers is discussed by a quantitative study of the ability of the laser to melt different multiples of the applied layer thickness. The formation of internal stress is inherent to components produced by the PBFLB/ M process. These stresses remain in the components after production as residual stresses. In this thesis a study is presented which aims to unravel the mechanisms that define the spatial distribution of the residual stresses, and their magnitude. In the end, the population of internal voids during mechanical testing is studied by X-ray micro computed tomography. The evolution of damage accumulation in creep specimens is studied at different stages of the creep test. Results are compared to a creep tested conventionally made specimen and to a PBF-LB/M specimen from a tensile test. An interconnection between the PBF-LB/M microstructure and the pattern of damage is revealed.}, subject = {Additive manufacturing; Computed tomography; Neutron diffraction; Residual stress; 316L; Additive Fertigung; Computertomographie; Neutronenbeugung; Edelstahl; Rapid Prototyping (Fertigung); Selektives Laserschmelzen; Zerst{\"o}rungsfreie Werkstoffpr{\"u}fung; Computertomografie; Neutronenbeugung}, language = {en} } @phdthesis{Zibar2023, author = {Zibar, Layla}, title = {Forced displacement urbanisms : territorial biographies and contemporary narratives in the Syrian refugee camps in the Kurdistan region of Iraq}, doi = {10.26127/BTUOpen-6297}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:co1-opus4-62976}, school = {BTU Cottbus - Senftenberg}, year = {2023}, abstract = {Violent chronic conflicts, uprooting, and the continuous massive (re)generation of displacement waves constitute the main elements of the Kurds' history within nation-states' (changing) geographies. Today, Kurdish-inhabited territories represent palimpsests of involuntary dislocations and relocation stories, constantly (re)written by refuge-seeking/ granting (spatial) practices. Since 2011, contemporary uprisings and wars in Syria and Iraq have inscribed the Kurdistan Region of Iraq (KR-I) territories with a new layer of displacement stories. These territories acted as frontline receptors for consecutive Syrian refugees and Iraqi internally displaced waves seeking protection. Displacees found refuge in the rural, urban and newly set humanitarian camps' spaces; hence, they (temporarily) anchored and carved some sort of a presence within their receiving sites. The rationale behind such receiving sites' emergence, use and progression in the KR-I have historically oscillated between modernization, discipline, development and humanitarianism. Guided by the urbanism lens, this research aims to narrate the KR-I's forced displacement territorial biography of involuntary dislocated and (re)located Kurds. This narration chronologically traces these groups' newly (re)shaped receiving sites and how refuge-seeking/granting practices aggregated and (re) articulated the KR-I's territories. It investigates the ways in which these receiving sites act as seeds of emerging urbanities in such a politically contested region. On the one hand, the research zooms out and repositions these sites' emergence and spatial progression within a broader geopolitical context, socioeconomic conditionalities, uses and meaning subversions due to the ever-changing actors. On the other hand, it zooms closely into the newly set Syrian-Kurdish refugee camps in the KR-I within and beyond predefined (nation-state) belongings in their ever-distorted time-space frames. It securitizes on the ways in which these sites are conceived and inhabited to (re)claim rights "to" and "in" space, territory, history and future. Between the large and small pictures, the research investigates the human and the non-human spatial agency that (re)patches these ruptured Kurds' collective memories and contemporary narratives of where, when, what and with whom (a future) home rests. This study is an urgent call for the international and local constellation of actors to critically rethink their standardized ready-made solutions and piece-meal spatial interventions in geographies associated with chronic crisis, ever (re)branded under emergency, development and peace 'help' banners. It sets the basis for rearticulating and developing further research-based interventions that account for exhausted conflict-ridden (infra)structures, political sensitivities, socio-economic situations and environmental impacts.}, subject = {Refugee camps; Forced displacement urbanisms; Homing; Territorial biographies; Roots and routs; Fl{\"u}chtlingslager; Zwangsumsiedlung; Territoriale Biographien; Kurdistan-Irak; Fl{\"u}chtlingslager; Vertreibung; Siedlung; Geschichte}, language = {en} } @phdthesis{Dinter2023, author = {Dinter, Franziska}, title = {Entwicklung mikropartikelbasierter Nachweisverfahren f{\"u}r hydrophile und amphiphile Biomarker}, doi = {10.26127/BTUOpen-6390}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:co1-opus4-63909}, school = {BTU Cottbus - Senftenberg}, year = {2023}, abstract = {F{\"u}r die Personalisierte Medizin wird eine pr{\"a}zise und schnelle Analyse relevanter kardiovaskul{\"a}rer, Tumor- oder Autoimmunbiomarker in der heutigen Labordiagnostik immer wichtiger. Patienten sollen m{\"o}glichst individuell und auf ihre Bed{\"u}rfnisse abgestimmt behandelt werden. Mithilfe einfacher, tragbarer, zeit- und materialsparender Analysemethoden sollen in Zukunft die {\"A}rzte durch automatisierte, multiparametrische Testsysteme unterst{\"u}tzt werden. Um diese Probleme adressieren zu k{\"o}nnen, ist es notwendig, Systeme zu entwickeln, die einen simultanen Nachweis von Protein-, Nukleins{\"a}ure-, und Lipidbiomarkern erm{\"o}glichen. Die vorliegende Dissertation setzt sich mit der Entwicklung mikropartikelbasierter Nachweissysteme f{\"u}r hydrophile und amphiphile Biomarker auseinander. Hierbei wurde ein mikropartikelbasierter Mikrofluidikchip zur Analyse von vier Protein- und DNAbasierten kardiovaskul{\"a}ren Biomarkern entwickelt. Dieser zeigt gegen{\"u}ber der Verwendung einer Multiwellplatte eine Reduzierung der Zeit von 1 h auf 7 min, die Reduzierung von Patientenmaterial, aufgrund des Einsatzes geringer Volumina und eine erh{\"o}hte Sensitivit{\"a}t um einen Faktor von f{\"u}nf gegen{\"u}ber den Herstellerangaben der Biomarker. Die Analyse amphiphiler Biomarker wie Phospholipide oder Lipoproteine setzte die Verwendung hydrophober Mikropartikel voraus. Neuartige, fluoreszenzkodierte, hydrophobe Mikropartikel wurden hergestellt und anhand verschiedener Kriterien wie Verhalten in Puffersystemen, Hydrophobizit{\"a}t, L{\"o}sungsmittelstabilit{\"a}t und Fluoreszenz- und Gr{\"o}ßenverteilung charakterisiert. Mithilfe der typisierten hydrophoben Mikropartikel wurden amphiphile Biomarker, wie z. B. Anti-Phospholipid-Antik{\"o}rper gegen Cardiolipin, welche bei Autoimmunerkrankungen, Krebs und kardiovaskul{\"a}ren Erkrankungen eine Rolle spielen, an die Mikropartikeloberfl{\"a}che gekoppelt. Ein aussagekr{\"a}ftiger Nachweis der Anti- Phospholipid-Antik{\"o}rper konnte sowohl auf Membran- als auch Mikropartikelbasis entwickelt werden. Mit dem entwickelten Proof-of-Principle konnten erste Patientenseren analysiert und eine eindeutige Zuordnung der positiven und negativen Seren vorgenommen werden.}, subject = {Mikropartikel; Hydrophobie; Hydrophilie; Mikrofluidik; Nachweisverfahren; Microparticle; Hydrophobic; Hydrophilic; Microfluidic; Detection methods; Amphiphilie; Biomarker; Hydrophilie; Mikrofluidik; Mikropartikel; Nachweis; Microfluidics}, language = {de} } @misc{Daeumer2023, author = {D{\"a}umer, Josefin Katrin}, title = {Einflussparameter und Marktrelevanz des Ex-Situ Power-to-Gas Verfahrens}, doi = {10.26127/BTUOpen-6395}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:co1-opus4-63959}, year = {2023}, abstract = {In den letzten Jahren hat in der Forschung und Wirtschaft die mikrobielle Biogasproduktion großes Interesse geweckt. Mit diesem Konzept k{\"o}nnte die Versorgung mit erneuerbarer Energie in Zeiten geringerer Energieerzeugung gew{\"a}hrleistet und zus{\"a}tzlich die Umwelt geschont werden. Bei der Power-to-Gas Technologie wird {\"u}bersch{\"u}ssige elektrische Energie f{\"u}r die Herstellung von Wasserstoff durch Elektrolyse verwendet. Anschließend werden Wasserstoff und Kohlenstoffdioxid mithilfe von hydrogenothrophen methanogenen Archaeen zu Methan (CH4) umgewandelt. Bei ausreichender Qualit{\"a}t (>97\%) k{\"o}nnte dieses ins nationale Erdgasnetz eingespeist werden. Dieses Verfahren kann durch die direkte Zugabe von H2 in einem Fermenter (in-situ) oder extern in einem separaten Biogasreaktor (ex-situ) stattfinden. In der vorliegenden Arbeit wurden die j{\"u}ngsten Forschungsergebnisse in Bezug auf das ex-situ Verfahren analysiert und zusammengetragen. Genauer wurde die Beeinflussung der Prozessvariablen sowie optimale Reaktionsbedingungen diskutiert. Zus{\"a}tzlich zum eigentlichen Ablauf des ex-situ Prozesses wird am Ende der Arbeit die Wirtschaftlichkeit er{\"o}rtert. Die Ergebnisse belegen, dass die ex-situ Biomethanisierung eine Produktgasqualit{\"a}t von mehr als 95\% erreichen kann. Daf{\"u}r m{\"u}ssen die Prozessvariablen jedoch optimal eingestellt werden. Gut geeignet w{\"a}re z.B. eine mit Methanobacterium angereicherte Mischkultur mit einem pH-Wert im Bereich von 7,1 bis 8,5. Weiterhin erl{\"a}utern viele Studien, dass eine ausreichende N{\"a}hrstoffversorgung, 5 bar Betriebsdruck und eine Umgebungstemperatur von 35 °C bis 55°C optimale Betriebsbedingungen darstellen. Aus wirtschaftlicher Sicht ist Biomethan nach aktuellem Stand der Technik preisintensiver als herk{\"o}mmliche Methanquellen. Jedoch k{\"o}nnten unter Ber{\"u}cksichtigung umweltschonender Effekte, Klimaschutz sowie dem Vertrieb von CO2- Zertifikaten die Kosten ausgeglichen und ein niedrigeres Preisniveau erreicht werden. Zusammenfassend stellt Power-to-Gas eine vielversprechende Zukunftstechnologie dar, welche die M{\"o}glichkeit auf eine umweltfreundliche und nahezu CO2-neutrale Biomethanproduktion unter Verwendung {\"u}bersch{\"u}ssiger Energie er{\"o}ffnet.}, subject = {Biogas; Power-to-Gas; Ex-situ; In-situ; Biocatalytic methanation; Hydrogen; Biogas; Methanproduktion; Power-to-Gas}, language = {de} } @phdthesis{Kabin2023, author = {Kabin, Ievgen}, title = {Horizontal address-bit SCA attacks against ECC and appropriate countermeasures}, doi = {10.26127/BTUOpen-6397}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:co1-opus4-63973}, school = {BTU Cottbus - Senftenberg}, year = {2023}, abstract = {In this work we investigated the resistance of different kP implementations based on the Montgomery ladder against horizontal, i.e. single trace, attacks. Applying statistical methods for the analysis we were able to reveal the secret value k completely. The reason causing the success of our attacks is the key-dependent addressing of the registers and other design blocks, which is an inherent feature of binary kP algorithms. This dependency was successfully exploited in the past by Itoh et al. analyzing many hundreds of kP traces, i.e. this attack is a vertical address-bit differential power analysis attack against Montgomery ladder. The vulnerability of the Montgomery ladder against horizontal address-bit attacks was detected and demonstrated during our investigations. We were able to reveal the scalar k exploiting the address-bit vulnerability in single trace attacks using not only statistical methods, but also Fourier transform, selected clustering methods as well as one of the simplest methods - the automatized simple SCA. We performed successful horizontal address-bit SCA attacks against both types of ECs, i.e. against highly regular Montgomery ladder and against a binary kP algorithm implementing atomic patterns. The success of our attacks shows that the regularity and atomicity principles are not effective against horizontal address-bit attacks. As a means for reducing the attack success, we investigated the hiding ability of the field multiplier which is usually the largest block of kP designs. We implemented our field multiplier for ECs over prime fields corresponding to the 4-segment Karatsuba multiplication formula that reduces the execution time and the energy consumption for a kP operation by about 40 \% in comparison to multipliers exploiting the classical multiplication formula. However, the energy consumption per clock remained in our multiplier without significant changes, i.e. the protective hiding properties of the multiplier as a noise source were not decreased. Another advantage of our field multiplier is its inherent resistance to horizontal collision attacks, in contrast to multipliers based on the classic multiplication formula. Additionally, we proposed regular scheduling for the block addressing as an effective strategy for reducing the success of horizontal address-bit attacks. Combining this approach with the hiding features of the field multipliers can increase the resistance of the kP designs for both types of ECs against a broad spectrum of SCA attacks. The mentioned analysis methods can be successfully applied for determining SCA leakage sources in the early design phase.}, subject = {Elliptic curve cryptography; Hardware implementation; Side-channel analysis; Horizontal attacks; Countermeasures; Elliptische Kurven-Kryptographie; Hardware Implementierung; Seitenkanalanalyse; Horizontale Angriffe; Gegenmaßnahmen; Seitenkanalattacke; Fehleranalyse; Differentielle Kryptoanalyse; Kryptosystem; Implementierung }, language = {en} } @phdthesis{Schmidt2022, author = {Schmidt, Jonas Paul Christian}, title = {Nanopore sequencing in laboratory medicine : novel molecular diagnostic prospects for Familial Mediterranean fever and SARS-CoV-2 infections}, doi = {10.26127/BTUOpen-6384}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:co1-opus4-63847}, school = {BTU Cottbus - Senftenberg}, year = {2022}, abstract = {Nanopore sequencing, a third-generation sequencing technique that applies nanometre sized pores to transduce the physical and chemical properties of specific nucleobases into measurable electrical signals, shows attractive advantages over conventional next-generation sequencing techniques. However, primarily due to high sequencing error rates this technique has rarely been used so far in clinical laboratory diagnostics. In this cumulative dissertation Nanopore sequencing was established and validated in clinical diagnostics using the example of the molecular diagnosis of Familial Mediterranean fever (FMF) and SARS coronavirus-2 (SARS-CoV-2) infections. First, a novel data analysis pipeline for accurate single nucleotide polymorphism (SNP) genotyping using Nanopore sequencing data was developed and validated with the corresponding sequencing protocol against conventional Sanger sequencing using 47 samples of patients with clinical suspicion of FMF. This method comparison showed a perfect agreement between both methods rendering current Nanopore sequencing in principle suitable for SNP genotyping in human genetics. The bioinformatic analysis of sequencing data is one of the most challenging parts in Nanopore sequencing experiments and complicates the application in a clinical diagnostic setting. Therefore, six different bioinformatic tools for sequence alignment were evaluated regarding their applicability to Nanopore sequencing data. This evaluation revealed a good suitability of all except one of these tools although differences in quality and performance exist. Since Nanopore sequencing showed a robust performance in SNP genotyping, a SARS-CoV-2 whole genome sequencing (WGS) protocol was established to enable onside viral WGS in a clinical laboratory. This was especially important for viral molecular biological surveillance during the pandemic as shown by analysing viral genetic data over the course of one year. Applying this approach in a clinical research project to investigate host-virus interaction by aggregating for the first time viral genetic data, serological data and clinical data, showed diverse humoral immune responses to SARS-CoV-2, that appear to be influenced by age, obesity and disease severity. Further, even small viral genetic changes may influence the clinical presentation of the associated disease COVID-19. Additionally, a novel reverse transcriptase (RT)- loop mediated isothermal amplification (LAMP) assay for the detection of SARS-CoV-2 was developed and validated for diagnostic use by method comparison with conventional RT-polymerase chain reaction (PCR). In summary, by presenting advancements of sequencing and bioinformatic workflows with the focus on an application in clinical diagnostics, the results of this thesis may pave the way for a broader application of Nanopore sequencing in laboratory medicine in the near future.}, subject = {Nanopore sequencing; Laboratory medicine; Molecular diagnostics; Familial Mediterranean fever; SARS-CoV-2; Nanopore-Sequenzierung; Labormedizin; Molekulare Diagnostik; Famili{\"a}res Mittelmeerfieber; Famili{\"a}res Mittelmeerfieber; Labormedizin; Molekulare Diagnostik; Sequenzierung; SARS-CoV-2; Diagnostics; Molecular medicine}, language = {en} } @phdthesis{Gliem2022, author = {Gliem, Silvia}, title = {Shaping the customer-provider relationship in service : frontline employees as key drivers for the improvement of service productivity}, doi = {10.26127/BTUOpen-6306}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:co1-opus4-63067}, school = {BTU Cottbus - Senftenberg}, year = {2022}, abstract = {Between 2000 and 2015, the services sector grew by 23\% in OECD countries, with around two-thirds of the working population employed in this sector. In the European Union, 72.1\% of the labor force worked in the services sector in 2018. With a growing global population, the demand for services is also increasing, making increasing service productivity an important research goal. Public and private service companies are subject to different incentive structures that influence their approach to productivity. Public service enterprises, especially in the social, health, and education sectors, play a critical role in society. Improving public service productivity is therefore essential. Two research questions are addressed: What factors have the greatest impact on the performance of service workers? How can performance improvement be expressed by managing the influencing factors of frontline employees? By focusing on frontline employees, this dissertation recognizes their essential role in increasing service productivity. The goal of the thesis is to gain insight into the factors that influence their productivity in public service. The dissertation reviews service productivity models in detail. Differences and connections between the various models and schools of models are discussed. Gr{\"o}nroos and Ojasalo's model of service productivity is selected as the theoretical framework for the empirical study to examine the factors influencing frontline employees. The systematic selection of influencing factors as well as the evaluation of previous research on these factors, reveals research gaps, which are translated into hypotheses. The majority of the data for the empirical part comes from public service companies. The designed questionnaire serves as a starting point for the development of a scale for empirical validation for one part, a component of the Gr{\"o}nroos-Ojasalo model. The research results offer a basis for action for practitioners who want to achieve productivity improvements.}, subject = {Service productivity; Frontline employee; Service quality; Service productivity model; Dienstleistungsproduktivit{\"a}t; Kundenkontaktmitarbeiter; Dienstleistungsqualit{\"a}t; {\"O}ffentliche Dienstleistung; Produktivit{\"a}t; Qualit{\"a}t; Angestellter; Kunde}, language = {en} }