title: The synthesis of triangulo-trimetal complexes containing both iron(II) and vanadium(II)

authors: Evans, David J.

subjects: Crystal structures

abstract: Reactions between a variety of vanadium(II) and iron(II) starting materials in tetrahydrofuran (thf) solution afforded di-, tri-, and tetra-nuclear complexes containing thf or N,N,N′,N′-tetramethylethylenediamine (tmen) as ligands. Most products were ionic and contained the two metals in different structural units, cation or anion. Trinuclear clusters formulated as [V3−xFexCl₅(tmen)₃][BPh₄](x=0–3) were obtained and characterised by C, H, N and metal analyses, ¹H NMR, Mössbauer, and positive ion FAB and electrospray mass spectroscopies, and magnetic moment measurements in solution. We characterised fully by low-temperature single-crystal X-ray diffraction analysis the mixed-metal triangulo-complex salt [V₂Fe(μ-Cl)₃(μ₃-Cl)₂(tmen)₃][BPh₄].

text: The synthesis of triangulo-trimetal complexes containing both iron(II) and vanadium(II) Reactions between a variety of vanadium(II) and iron(II) starting materials in tetrahydrofuran (thf) solution afforded di-, tri-, and tetra-nuclear complexes containing thf or N,N,N′,N′-tetramethylethylenediamine (tmen) as ligands. Most products were ionic and contained the two metals in different structural units, cation or anion. Trinuclear clusters formulated as [V3−xFexCl₅(tmen)₃][BPh₄](x=0–3) were obtained and characterised by C, H, N and metal analyses, ¹H NMR, Mössbauer, and positive ion FAB and electrospray mass spectroscopies, and magnetic moment measurements in solution. We characterised fully by low-temperature single-crystal X-ray diffraction analysis the mixed-metal triangulo-complex salt [V₂Fe(μ-Cl)₃(μ₃-Cl)₂(tmen)₃][BPh₄].

year: 2001-07-01

title: Utility Exchanger Network Design for Non-Isothermal Utility Considering Process Control

authors: Tarighaleslami, Amir Hossein

abstract: This paper investigates a preliminary control strategy based on bypass control loop of Utility Exchangers Network (UEN) for non-isothermal utilities in a Total Site Heat Integration (TSHI) system. Few details on the design and control of non-isothermal utility systems, e.g. hot water loops, that includes Total Site heat recovery are presented in the literature. Heat Exchanger Networks (HEN) can be considered as a combined Heat Recovery Network (HRN) and UEN for each individual processes within the Total Site. Control strategy presented in the current paper are based on the control of utility side in a process – utility heat exchanger match to control process stream target temperature and analyse Total Site (TS) utility system in a Process Integration point of view. Bypass control has been used in the research. A Hot Water loop as representative of a large industrial plant utility system is studied as a case study. The process stream segment target temperature to be achieved and process stream segment supply temperature and flow rate may vary up to ±15 %. The HW utility temperature in the loop is controlled by using indirect heat transfer from higher and lower level utility and by using HW loop bypass. A 24 h period has been considered for the study. Results show that the HW utility loop has a 2.4 MW heat deficit in time-average condition. By controlling the HW utility loop using the proposed heuristics, utility heating requirement may vary between 0.7 to 3.5 MW, which is supplied by the Low Pressure steam main.

text: Utility Exchanger Network Design for Non-Isothermal Utility Considering Process Control This paper investigates a preliminary control strategy based on bypass control loop of Utility Exchangers Network (UEN) for non-isothermal utilities in a Total Site Heat Integration (TSHI) system. Few details on the design and control of non-isothermal utility systems, e.g. hot water loops, that includes Total Site heat recovery are presented in the literature. Heat Exchanger Networks (HEN) can be considered as a combined Heat Recovery Network (HRN) and UEN for each individual processes within the Total Site. Control strategy presented in the current paper are based on the control of utility side in a process – utility heat exchanger match to control process stream target temperature and analyse Total Site (TS) utility system in a Process Integration point of view. Bypass control has been used in the research. A Hot Water loop as representative of a large industrial plant utility system is studied as a case study. The process stream segment target temperature to be achieved and process stream segment supply temperature and flow rate may vary up to ±15 %. The HW utility temperature in the loop is controlled by using indirect heat transfer from higher and lower level utility and by using HW loop bypass. A 24 h period has been considered for the study. Results show that the HW utility loop has a 2.4 MW heat deficit in time-average condition. By controlling the HW utility loop using the proposed heuristics, utility heating requirement may vary between 0.7 to 3.5 MW, which is supplied by the Low Pressure steam main.

year: 2018

title: Conclusion: Relationships of interdependence—Making the difference together

authors: Berryman, Mere

abstract: This chapter begins by taking a brief look at New Zealand history. It then presents two different Māori whakataukī as metaphors, both to reconnect to the beginning of the book and also to make connections throughout the book as a whole. These metaphors are used to bring the chapters together and to consider how inclusion, a term that is often highly contested and poorly understood (Wearmouth, 2009), might begin to be better understood and applied when working with Māori children and young people with disabilities, or special education needs, or both, and with their families.

text: Conclusion: Relationships of interdependence—Making the difference together This chapter begins by taking a brief look at New Zealand history. It then presents two different Māori whakataukī as metaphors, both to reconnect to the beginning of the book and also to make connections throughout the book as a whole. These metaphors are used to bring the chapters together and to consider how inclusion, a term that is often highly contested and poorly understood (Wearmouth, 2009), might begin to be better understood and applied when working with Māori children and young people with disabilities, or special education needs, or both, and with their families.

year: 2015