Die vorliegende Arbeit beschäftigt sich mit der Entwicklung eines neuartigen, autarken, folienbasierten Sensorsystems für die Belastungsdetektion an Leichtbaumaterialien. Das integrierte Sensorsystem ist in der Lage mechanische Belastungen über die Photolumineszenz von Quantum Dots visuell darzustellen, wodurch strukturelle Defekte in Leichtbaumaterialien frühzeitig erkannt und ein Totalausfall einer gesamten Leichtbaukonstruktion verhindert werden kann. Dies führt neben einer erhöhten Sicherheit einzelner Komponenten und kompletter Konstruktionen auch zu Gewichts-, Kosten- und Rohstoffersparnissen. Die gezielte Beeinflussung der Photolumineszenz von Quantum Dots durch Ladungsträgerinjektion als Hauptmechanismus des Sensorsystems erfordert spezielle Lagenaufbauten von Dünnschichtsystemen. Durch die Kombination dieser Dünnschichtsysteme mit piezoelektrischen Materialien entsteht ein autarkes Sensorsystem, wodurch eine Auswertung, Visualisierung und Speicherung der Information über eine stattgefundene mechanische Belastung an Leichtbaumaterialien auf kleinsten Raum erreicht wird.:Inhaltsverzeichnis Formelverzeichnis Abkürzungsverzeichnis Vorwort 1 Einleitung 1.1 Motivation 1.2 Zielstellung 2 Autarker Sensor für mechanische Beanspruchungen 2.1 Sensorkonzept, -aufbau und Funktionsweise 2.2 Anforderungen an die Funktionalität 2.3 Stand der Technik 3 Theoretische Grundlagen 3.1 Quantum Dots 3.1.1 Größenquantisierungseffekt 3.1.2 Photolumineszenz 3.1.3 Aufbau und Materialien 3.1.4 Kommerziell erhältliche Quantum Dots 3.2 Mechanismen zur Beeinflussung der Photolumineszenz 3.2.1 Ladungsträgerinjektion in den QD Kern 3.2.2 Feldinduzierte Ionisation des Exzitons 3.2.3 Weitere Mechanismen 3.3 Ladungsträgertransportschichten 3.3.1 Poly(N-vinylkarbazol) 3.3.2 N,N,N´,N´-Tetrakis(3-methylphenyl)-3,3´-dimethylbenzidin 3.3.3 Poly(3,4-ethylendioxythiophen)-poly(styrolsulfonat) 3.4 Lithiumfluorid als elektrischer Isolator 3.5 Modellsysteme 3.5.1 Einbettung der QDs in organische Lochtransportschichten 3.5.2 QDs zwischen Elektrode und organischer Lochtransportschicht 3.5.3 QDs zwischen Elektrode und Nichtleiter 4 Experimentelle Vorgehensweise 4.1 Layout und Kontaktierung von Teststrukturen 4.2 Verfahren zur Herstellung dünner Schichten 4.2.1 Physikalische Gasphasenabscheidung 4.2.2 Rotationsbeschichtung 4.2.3 Weitere Verfahren 4.3 Charakterisierung der Schichten und der Gesamtfunktionalität 4.3.1 Mikrospektroskopieaufbau 4.3.2 Weitere Messverfahren 4.4 Integration der Schichtstapel in Faserkunststoffverbund 5 Experimentelle Untersuchungen 5.1 Einordnung der einzelnen Schichten der Modellsysteme 5.1.1 Elektroden 5.1.2 Matrixmaterial und Quantum Dots 5.2 Einordnung des elektrischen Verhaltens der Modellsysteme 5.2.1 Modellsystem I 5.2.2 Modellsystem II 5.2.3 Modellsystem III 5.3 Einfluss externer Beleuchtung am Modellsystem II und III 5.3.1 Modellsystem II 5.3.2 Modellsystem III 5.4 Wiederholbarkeit der elektrischen Beanspruchung am Modellsystem III 5.4.1 Photolumineszenzintensität 5.4.2 Stromdichte 5.4.3 Gesamtwiderstand im Schichtstapel 5.5 Einfluss des elektrischen Feldes am Modellsystem III 5.5.1 Photolumineszenzintensität 5.5.2 Stromdichte 5.5.3 Widerstand 5.6 Einfluss der Integration auf das Verhalten von Modellsystem III 5.6.1 Optisches Verhalten der Laminiertasche und des Harzsystems 5.6.2 Funktionalität des Schichtstapels nach der Integration 5.7 Temperaturwechseltest am integrierten Schichtstapel 5.8 Speicherzeit elektrischer Ladungsträger am Modellsystem III 5.8.1 Stabilität des Lasers und der PL Intensität 5.8.2 Reproduzierbarkeit 5.8.3 Langzeitmessung 5.9 Kopplung des Schichtsystems mit piezoelektrischem Element 6 Zusammenfassung und Ausblick 6.1 Zusammenfassung 6.2 Ausblick Anhang A : Layouts für untere Elektrode E1 und obere Elektrode E2 Anhang B : Halter für die Kontaktierung der Teststrukturen Anhang C : Frontpanel zur Aufnahme der Photolumineszenz Anhang D : Messdaten Profilometer Veeco Dektak 150 Literaturverzeichnis Abbildungsverzeichnis Tabellenverzeichnis Lebenslauf / This work focuses on the development of a novel, self-sufficient, film-based sensor system for load detection on lightweight materials. The integrated sensor system is capable to visualize mechanical loads on lightweight structures by quenching the photoluminescence of quantum dots. Structural defects in lightweight materials can thus be detected at an early stage and total failure of an entire lightweight structure can be prevented. In addition to increased safety of individual components and complete structures, this also leads to weight, cost and raw material savings. The quenching of the photoluminescence of quantum dots by charge carrier injection as the main mechanism of the sensor system requires special thin-film layer stacks. By combining these thin-film layer stacks with piezoelectric materials, a self-sufficient sensor system is created. An evaluation, visualization and storage of the information about a mechanical load that has taken place on lightweight materials is thus achieved in a very small space.:Inhaltsverzeichnis Formelverzeichnis Abkürzungsverzeichnis Vorwort 1 Einleitung 1.1 Motivation 1.2 Zielstellung 2 Autarker Sensor für mechanische Beanspruchungen 2.1 Sensorkonzept, -aufbau und Funktionsweise 2.2 Anforderungen an die Funktionalität 2.3 Stand der Technik 3 Theoretische Grundlagen 3.1 Quantum Dots 3.1.1 Größenquantisierungseffekt 3.1.2 Photolumineszenz 3.1.3 Aufbau und Materialien 3.1.4 Kommerziell erhältliche Quantum Dots 3.2 Mechanismen zur Beeinflussung der Photolumineszenz 3.2.1 Ladungsträgerinjektion in den QD Kern 3.2.2 Feldinduzierte Ionisation des Exzitons 3.2.3 Weitere Mechanismen 3.3 Ladungsträgertransportschichten 3.3.1 Poly(N-vinylkarbazol) 3.3.2 N,N,N´,N´-Tetrakis(3-methylphenyl)-3,3´-dimethylbenzidin 3.3.3 Poly(3,4-ethylendioxythiophen)-poly(styrolsulfonat) 3.4 Lithiumfluorid als elektrischer Isolator 3.5 Modellsysteme 3.5.1 Einbettung der QDs in organische Lochtransportschichten 3.5.2 QDs zwischen Elektrode und organischer Lochtransportschicht 3.5.3 QDs zwischen Elektrode und Nichtleiter 4 Experimentelle Vorgehensweise 4.1 Layout und Kontaktierung von Teststrukturen 4.2 Verfahren zur Herstellung dünner Schichten 4.2.1 Physikalische Gasphasenabscheidung 4.2.2 Rotationsbeschichtung 4.2.3 Weitere Verfahren 4.3 Charakterisierung der Schichten und der Gesamtfunktionalität 4.3.1 Mikrospektroskopieaufbau 4.3.2 Weitere Messverfahren 4.4 Integration der Schichtstapel in Faserkunststoffverbund 5 Experimentelle Untersuchungen 5.1 Einordnung der einzelnen Schichten der Modellsysteme 5.1.1 Elektroden 5.1.2 Matrixmaterial und Quantum Dots 5.2 Einordnung des elektrischen Verhaltens der Modellsysteme 5.2.1 Modellsystem I 5.2.2 Modellsystem II 5.2.3 Modellsystem III 5.3 Einfluss externer Beleuchtung am Modellsystem II und III 5.3.1 Modellsystem II 5.3.2 Modellsystem III 5.4 Wiederholbarkeit der elektrischen Beanspruchung am Modellsystem III 5.4.1 Photolumineszenzintensität 5.4.2 Stromdichte 5.4.3 Gesamtwiderstand im Schichtstapel 5.5 Einfluss des elektrischen Feldes am Modellsystem III 5.5.1 Photolumineszenzintensität 5.5.2 Stromdichte 5.5.3 Widerstand 5.6 Einfluss der Integration auf das Verhalten von Modellsystem III 5.6.1 Optisches Verhalten der Laminiertasche und des Harzsystems 5.6.2 Funktionalität des Schichtstapels nach der Integration 5.7 Temperaturwechseltest am integrierten Schichtstapel 5.8 Speicherzeit elektrischer Ladungsträger am Modellsystem III 5.8.1 Stabilität des Lasers und der PL Intensität 5.8.2 Reproduzierbarkeit 5.8.3 Langzeitmessung 5.9 Kopplung des Schichtsystems mit piezoelektrischem Element 6 Zusammenfassung und Ausblick 6.1 Zusammenfassung 6.2 Ausblick Anhang A : Layouts für untere Elektrode E1 und obere Elektrode E2 Anhang B : Halter für die Kontaktierung der Teststrukturen Anhang C : Frontpanel zur Aufnahme der Photolumineszenz Anhang D : Messdaten Profilometer Veeco Dektak 150 Literaturverzeichnis Abbildungsverzeichnis Tabellenverzeichnis Lebenslauf

This Master of Laws dissertation is a treatise of “The efficacy of Alternative Dispute Resolution (ADR) in labour disputes: a critical comparative analysis of Botswana, South Africa (RSA) and Zimbabwe.” Alternative Dispute Resolution hereinafter referred to as (“ADR”) has attracted so much research ado worldwide with policy makers alive to its possibilities in so far as it ought to shed off the burden of the courts in handling disputes. Courts are considered inundated with unresolved cases taking many years to finalise. ADR is therefore touted, not only the panacea, but the cheaper, efficient and effective alternative to normal court process. This study was saddled with the common challenges of definition, scope and methodology as does most scientific studies, especially to locate the concept ADR in the plethora of views from prominent exponent-s of the discipline. This study labored on the considered view that ADR is essentially an ‘out of court settlement approach to dispensing with disputes involving an attempt by disputants to rope in an impartial third party to aid finality to the respective wrangle. The lack of a methodological approach to treat this subject matter, made this study more challenging. The study had to therefore rely on a hypothetical model developed after gleaning through various scholarly views 1 that sought to treat the subject of ADR efficacy in labour dispute resolution. The study contented with the strongly held view 2 that ADR is an efficacious approach in resolving disputes outside the court system. As to whether this was the case in Botswana, RSA and Zimbabwe in so far as labour dispute resolution is concerned was the major challenge this study was seized with? A model was formulated which envisaged that efficaciousness of ADR may be achieved if three conditions or criteria are present within a jurisdiction, namely (1) ADR Background Conditions that comprise (a) adequate legislative and political support; (b) Supportive institutional and cultural norms, (c) adequate and competent manpower, (d) sufficient funding support, and (e) power-parity of disputants; (2) ADR Program Design comprising of (a) Planning and preparation and (b) Operations and implementation and finally (3) ADR Measures (a) Client satisfaction; (b) Time efficient; (c) Cost saving and (d) Settlement & enforcement. This study measured the situations obtaining in the three countries using these three-pronged criteria. In all three measures3 this study found that although all the three countries still have a long way before their ADR became as efficacious as would be reasonably possible, RSA has made many strides such as legislative enactments immediately upon attaining independence that sought to address the injustices of the past and thereby installing structures for enforcing industrial democracy 4, while Botswana and Zimbabwe took 5 years 5 and over 10 years 6 respectively after attaining independence. RSA established an independent body for dispensing with labour dispute settlement7 while Botswana8 and Zimbabwe 9 are still reluctant to do so, relying rather on their labour ministries often marinated in bureaucratic bottlenecks hence stalling efficacy of ADR. While RSA makes effort to provide adequate and competent manpower because of sufficient funding, Botswana and Zimbabwe still struggle to dispense with disputes under their labour departments who are either inadequately skilled or also accused of favouritism in the case of Zimbabwe.10 All the three countries are regarded as unequal societies which tends to sway the power-parity of disputants with capitalists still wielding unbridled powers in dispute outcomes. South Africa enacted section 143 to the Labour Relations Act 11 which empowers the Director of CCMA to certify an arbitral award, giving it the same force as an order of the Magistrate Court. This has cut off the time and administrative burden of having to register an arbitral award with the court so as to obtain writs of executions and enforce it, a practice which is still prevalent in Zimbabwe. The Department of Labour in South Africa has made funding available to the CCMA to assist employees who are not in a financial position to enforce awards in their favour.12 The funding is aimed at employees who are too indigent to afford the costs of enforcement.13 These employees are deemed to be: (a) Employees who earn below the earnings threshold (currently at R205 433.30 per annum) – proof of income will be required by the CCMA. There is no record regarding enforcement or ease of enforcement of ADR outcomes in Botswana and Zimbabwe or at least this study is aware of. The governments of Botswana and Zimbabwe have been accused of using a heavy hand in determining wages, the right to strike and often curtailing union power through declaring certain sectors essential services. RSA’s Commission for Conciliation, Mediation and Arbitration hereinafter after referred to as (the “CCMA”)14 runs an electronic system of case management by which cases are screened and assigned commissioners whereas Zimbabwe and Botswana still rely on manual systems often inefficiently managed especially when it comes to allocating matters to ADR interventionists.15 In Zimbabwe the challenge of resources is acute often the Labour Officers lacking a simple photocopier and postage stamps to dispense with administration of disputes. This dissertation found that Botswana and Zimbabwe lack publicly available information from which to infer the efficaciousness of ADR practices therein. Measuring client satisfaction, efficiency and cost effectiveness, enforcement and settlement has not been tackled with ease, which was different when it came to RSA. This study argues that RSA’s ADR is efficacious rated at 75% attainment of settlement of disputes, despite accusations of failing to offer disputants options and job retention at the end of ADR intervention. Botswana and Zimbabwe on the measures raised above are not yet close to achieving efficaciousness based on the above criteria. The challenges need to be addressed to ensure that in all three measures ADR affords Botswana, RSA and Zimbabwe disputants a cheaper, efficient and effective alternative to dispensing with labour disputes. This study concluded with recommendations arising from the three measures ADR Background Conditions; ADR Program Design and (3) ADR Measures could be implemented towards achieving an efficacious ADR regime for the three countries and beyond. / Mercantile Law / LL.M.

The concept "beneficial use" plays a pivotal role in South African water law reform. It forms the foundation of the mechanism to make water use rights available for the reform of the allocation of water use entitlements. The mechanism involves that water use rights that were unexercised in the two years before the promulgation of the National Water Act 36 of 1998 are not defined as existing lawful water uses. Where the concept "beneficial use" is utilised to cancel unexercised water use rights, it can cause potential hardship. Some people whose rights have been cancelled believe that they should be able to rely on the property clause in section 25 of the Constitution of 1996 to either have the legislation declared unconstitutional or to demand compensation. Section 25 of the Constitution of 1996 prohibits the arbitrary deprivation of property and states that property may only be expropriated for a public purpose or in the public interest, subject to compensation. Section 25(4) states, however, that the public interest includes the nation's commitment to land reform and to reforms to bring about equitable access to all South Africa's natural resources. It is clear from this that reforms to bring about access to water are allowed by the property clause. One of the main questions discussed in this thesis was whether section 32 of the National Water Act 36 of 1998 that made more water available for distribution for reform purposes by cancelling unexercised water user rights, leads to an arbitrary deprivation or an expropriation of property. It should be noted that section 32 of the National Water Act did not constitute an arbitrary deprivation of property, as sufficient reason exists for water law reform. A possible constitutional challenge based on the lack of due process of law because of the retrospective operation of the section may possibly be averted because of the existence of section 33 of the National Water Act. Section 33 of the Act mitigates hardship by allowing unexercised water uses to be declared existing lawful water uses in certain circumstances where a good reason for the non–exercise of the water use right existed. Even in cases where section 33 does not prevent section 32 from being regarded as an arbitrary deprivation of property because there still was not a proper procedure, the government will probably be able to show that the limitation in section 32 is, in terms of section 36(1) of the Constitution of 1996, reasonable and justifiable in an open and democratic society. Despite the fact that section 25(1) prohibits arbitrary deprivations, it does not prohibit the government from regulating competing rights to use water even though some people may be negatively affected by the regulation. Because the Minister merely acts as public trustee of the nation's water resources on behalf of the national government in terms section 3(1) of the National Water Act, it cannot be claimed that the government acquired the cancelled water use rights. A claim that compensation should be paid for an expropriation of property will therefore not succeed. Compensation is only payable in terms of section 22(6) and section 22(7) of the National Water Act 36 of 1998 for a loss of existing water entitlements, such as existing lawful water uses or existing licences. A court should thus consider interpreting section 25 by providing for compensation where an individual was unfairly burdened and was therefore denied the protection of the equality clause in section 9 of the Constitution when his unexercised water use rights were cancelled by section 32. The concept "beneficial use" currently restricts the content of the water use entitlement existing in terms of section 4 of the National Water Act 36 of 1998. The loss of the entitlement when inter alia a licence for an existing lawful water use is refused, is not protected by the payment of compensation when water is used in an unfair or disproportionate manner, because such utilisation would not be regarded to be beneficial use. It became apparent that in terms of the current water law dispensation in South Africa, the possibility of compensation for an amendment of a water use licence and the refusal of a licence for an existing lawful water use implies that a water use entitlement is a right in property. The fact that section 22(7) of the National Water Act states that the amount of the compensation must be determined in accordance with section 25(3) of the Constitution implies that the legislature also recognises that a water use entitlement is constitutional property. Section 22(7) of the National Water Act underlines the basic premises of the National Water Act by subjecting the amount of the compensation that is payable to the same limitations that restrict the entitlement to use the water. The stipulations of section 22(7) draw the attention to the fact that the exercise of both existing lawful water uses and water use licences as rights in property is subject to basic principles of the National Water Act such as the Reserve and the concepts "public trusteeship" and "beneficial use" of the water resources. The fact that compensation is only payable when there has been severe prejudice to the economic viability of an undertaking implies that water use entitlements have to be exercised at the time of the application for the compensation to be payable. The concept "beneficial use" – in the sense that a water use must not be wasteful or polluting and in the sense that only water use entitlements that are being exercised are protected – thus restricts the water use entitlement as a property right. During the research, American and Australian water law reform and their interpretation of their property clauses were compared to water law reform in South Africa and the South African property clause. Furthermore, Australian policy to encourage more beneficial water use by the trade in water entitlements or allocations, was also discussed. South Africans will likely in future be encouraged to trade in water use entitlements or allocations. The objective with allowing the trade in water use entitlements or allocations is to encourage people to rather use water for uses with a high value instead of uses with a lower value. In this way the concept "beneficial use" may be broadened to include water allocation or entitlement trading. However, it was argued that a disproportionate impact on third parties would mean that water allocation or entitlement trading would in some cases not be regarded as beneficial use anymore. / Thesis (LL.D.)--North-West University, Potchefstroom Campus, 2011.

The concept "beneficial use" plays a pivotal role in South African water law reform. It forms the foundation of the mechanism to make water use rights available for the reform of the allocation of water use entitlements. The mechanism involves that water use rights that were unexercised in the two years before the promulgation of the National Water Act 36 of 1998 are not defined as existing lawful water uses. Where the concept "beneficial use" is utilised to cancel unexercised water use rights, it can cause potential hardship. Some people whose rights have been cancelled believe that they should be able to rely on the property clause in section 25 of the Constitution of 1996 to either have the legislation declared unconstitutional or to demand compensation. Section 25 of the Constitution of 1996 prohibits the arbitrary deprivation of property and states that property may only be expropriated for a public purpose or in the public interest, subject to compensation. Section 25(4) states, however, that the public interest includes the nation's commitment to land reform and to reforms to bring about equitable access to all South Africa's natural resources. It is clear from this that reforms to bring about access to water are allowed by the property clause. One of the main questions discussed in this thesis was whether section 32 of the National Water Act 36 of 1998 that made more water available for distribution for reform purposes by cancelling unexercised water user rights, leads to an arbitrary deprivation or an expropriation of property. It should be noted that section 32 of the National Water Act did not constitute an arbitrary deprivation of property, as sufficient reason exists for water law reform. A possible constitutional challenge based on the lack of due process of law because of the retrospective operation of the section may possibly be averted because of the existence of section 33 of the National Water Act. Section 33 of the Act mitigates hardship by allowing unexercised water uses to be declared existing lawful water uses in certain circumstances where a good reason for the non–exercise of the water use right existed. Even in cases where section 33 does not prevent section 32 from being regarded as an arbitrary deprivation of property because there still was not a proper procedure, the government will probably be able to show that the limitation in section 32 is, in terms of section 36(1) of the Constitution of 1996, reasonable and justifiable in an open and democratic society. Despite the fact that section 25(1) prohibits arbitrary deprivations, it does not prohibit the government from regulating competing rights to use water even though some people may be negatively affected by the regulation. Because the Minister merely acts as public trustee of the nation's water resources on behalf of the national government in terms section 3(1) of the National Water Act, it cannot be claimed that the government acquired the cancelled water use rights. A claim that compensation should be paid for an expropriation of property will therefore not succeed. Compensation is only payable in terms of section 22(6) and section 22(7) of the National Water Act 36 of 1998 for a loss of existing water entitlements, such as existing lawful water uses or existing licences. A court should thus consider interpreting section 25 by providing for compensation where an individual was unfairly burdened and was therefore denied the protection of the equality clause in section 9 of the Constitution when his unexercised water use rights were cancelled by section 32. The concept "beneficial use" currently restricts the content of the water use entitlement existing in terms of section 4 of the National Water Act 36 of 1998. The loss of the entitlement when inter alia a licence for an existing lawful water use is refused, is not protected by the payment of compensation when water is used in an unfair or disproportionate manner, because such utilisation would not be regarded to be beneficial use. It became apparent that in terms of the current water law dispensation in South Africa, the possibility of compensation for an amendment of a water use licence and the refusal of a licence for an existing lawful water use implies that a water use entitlement is a right in property. The fact that section 22(7) of the National Water Act states that the amount of the compensation must be determined in accordance with section 25(3) of the Constitution implies that the legislature also recognises that a water use entitlement is constitutional property. Section 22(7) of the National Water Act underlines the basic premises of the National Water Act by subjecting the amount of the compensation that is payable to the same limitations that restrict the entitlement to use the water. The stipulations of section 22(7) draw the attention to the fact that the exercise of both existing lawful water uses and water use licences as rights in property is subject to basic principles of the National Water Act such as the Reserve and the concepts "public trusteeship" and "beneficial use" of the water resources. The fact that compensation is only payable when there has been severe prejudice to the economic viability of an undertaking implies that water use entitlements have to be exercised at the time of the application for the compensation to be payable. The concept "beneficial use" – in the sense that a water use must not be wasteful or polluting and in the sense that only water use entitlements that are being exercised are protected – thus restricts the water use entitlement as a property right. During the research, American and Australian water law reform and their interpretation of their property clauses were compared to water law reform in South Africa and the South African property clause. Furthermore, Australian policy to encourage more beneficial water use by the trade in water entitlements or allocations, was also discussed. South Africans will likely in future be encouraged to trade in water use entitlements or allocations. The objective with allowing the trade in water use entitlements or allocations is to encourage people to rather use water for uses with a high value instead of uses with a lower value. In this way the concept "beneficial use" may be broadened to include water allocation or entitlement trading. However, it was argued that a disproportionate impact on third parties would mean that water allocation or entitlement trading would in some cases not be regarded as beneficial use anymore. / Thesis (LL.D.)--North-West University, Potchefstroom Campus, 2011.