9,443 research outputs found
Globalization of the Frozen Potato Industry
No full textThis paper examines the globalization of the frozen potato industry, including the expansion of production and processing of potato products in the global market place, and future prospects for the industry. Driven largely by the rising popularity of Western style cuisine, frozen french fries and other frozen potato products have become global commodities generating billions of dollars in revenue worldwide. This study finds that with markets for frozen potato products in the United States and other developed countries hardly expanding, the growth of the frozen potato industry will critically depend on industry’s ability to sustain growth in developing economies.french fries, frozen potato products, globalization, quick service restaurants, International Relations/Trade, Marketing,
Alternanthera sessilis DC.
No full text* Alternanthera sessilis (L.) R.Br. ex DC. — Habit: Herb. Habitat: LMDF. Distribution: IV. Voucher: N/A. Reference: Fries & Fries (1925).Published as part of Zhou, Ya-Dong, Mwachala, Geoffrey, Hu, Guang-Wan & Wang, Qing-Feng, 2022, Annotated checklist of the vascular plants of Mount Kenya, East Africa, pp. 1-108 in Phytotaxa 546 (1) on page 68, DOI: 10.11646/phytotaxa.546.1.1, http://zenodo.org/record/655046
Common Mode Currents in DC Power Routers
No full textThe grid reinforcement and energy redirection needs have led to the emergence of Back-To-Back Voltage Source Converter (BTB-VSC) based dc power routers. This paper investigates the low frequency Common Mode Currents (CMCs) that arise in the system if the employed BTB-VSCs have an un-isolated ac path connected in parallel to their output ports. Simulation results are presented to show a sensitivity analysis of lower order harmonics in CMC with respect to the operating active and reactive power of the dc router, dc link voltage, link resistance, modulation method and pole capacitance. Experimental results are shared to show existance of lower order CMC in 3-wire ac link operating in parallel with the dc power router and these are mitigated using zero sequence controller
Erythrina abyssinica DC.
No full textErythrina abyssinica DC. — Habit: Tree. Habitat: LMWF, LMDF; up to 2 100 m. Distribution: II. Voucher: N/A. Reference: Fries & Fries (1927b).Published as part of Zhou, Ya-Dong, Mwachala, Geoffrey, Hu, Guang-Wan & Wang, Qing-Feng, 2022, Annotated checklist of the vascular plants of Mount Kenya, East Africa, pp. 1-108 in Phytotaxa 546 (1) on page 46, DOI: 10.11646/phytotaxa.546.1.1, http://zenodo.org/record/655046
Modeling, Control, and Operation of an M-DAB DC-DC Converter for Interconnection of HVDC Grids
No full textFuture high-voltage direct-current (HVDC) networks based on voltage source converters (VSCs) will have different structures (asymmetric monopolar, bipolar, or symmetric monopolar), voltage levels, control, and protection schemes. Therefore, dc-dc converters are needed to interconnect those VSC-HVDC grids and several technical issues on their control and operational systems must be adequately addressed. A dc-dc converter based on a modular-dual active bridge (M-DAB) converter is suggested to reach a desirable interconnection of the HVDC grids and regulate power flow (PF) between them. A dynamic averaged model is proposed for the M-DAB converter and its stability is analyzed using the Lyapunov function. Moreover, a new local controller based on nonlinear control theory is proposed for the M-DAB. The new M-DAB local controller is integrated with the energy management system (EMS), by updating the PF equations, to create a complete control structure. Considering the CIGRE DCS3 HVDC test system and the studied M-DAB, static, dynamic simulation, and experimental studies are conducted and the dc-dc converter and the performance of the designed controllers and the EMS are examined and validated.Green Open Access added to TU Delft Institutional Repository 'You share, we take care!' - Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Intelligent Electrical Power Grid
Annona exsucca DC.
No full text[26] Annona exsucca DC. in Dunal, Monogr. Anonac.: 77 [Aug.-Nov. 1817] (Candolle 1817). — Rollinia exsucca (DC.) A.DC., Mém. Soc. Phys. Genève 5: 199 (Candolle 1832). Rollinia puberula A.DC., Mém. Soc. Phys. Genève 5: 200 (Candolle 1832). Rollinia multiflora Splitg., Tijdschr. Nat. Geschied. Physiol. 9: 97 [Aug.-Sep. 1842] (Splitgerber 1842). Rollinia tinifolia Klotzsch ex M.R.Schomb., Reis. Br. - Guiana [Ri. Schomburgk] 3: 1163 [“1848” publ. 7-10 Mar. 1849] (Schomburgk 1849), nom. subnud. Rollinia glaucescens Miq., Stirp. Surinam. Select.: 108 [“1850” publ. Mar. 1851] (Miquel 1851). Rollinia resinosa Spruce ex Benth., Hooker’s J. Bot. Kew Gard. Misc. 5: 9 (Bentham 1853). — Rollinia exsucca subsp. resinosa (Spruce ex Benth.) R.E.Fr., Acta Horti Berg. 12 (1): 144 (Fries 1934). Rollinia incurva S.Moore, Trans. Linn. Soc. London, Bot. 4 (3): 303 [“1894-96” publ. Dec. 1895] (Moore 1895). Rollinia brevipes R.E.Fr., Acta Horti Berg. 12 (1): 147 (Fries 1934). Rollinia broadwayi R.E.Fr., Acta Horti Berg. 12 (1): 145 (Fries 1934). Rollinia broadwayi var. cuneata R.E.Fr., Acta Horti Berg. 12 (1): 145 (Fries 1934). Rollinia exsucca subsp. elongata R.E.Fr., Acta Horti Berg. 12 (1): 145 (Fries 1934). Rollinia gardneri R.E.Fr., Acta Horti Berg. 12 (1): 157 (Fries 1934). Rollinia surinamensis R.E.Fr., Acta Horti Berg. 12 (1): 147 (Fries 1934). Rollinia procera R.E.Fr., Acta Horti Berg. 12 (3): 565 (Fries 1939). NOTE. — Dunal (1817: 77) explicitly ascribed the name and description of Annona exsucca to “DC. Syst. univ. ined.” See above note for Annona exsucca. VERNACULAR NAMES. — Pa: manig-retni • Ka: kasimyalan, tagulewe, takulewe • Wp: ɨwi lũ• Nt: busi atuku • Cr: abriba-sovaj • Fr: corossol sauvage • Br: araticú-do-mato, araticú-macho, biribá-brava. HERBARIUM DATA (FG). — 130 collections at CAY.Sel.exs.: Unknown coll. s.n. (holotype of Rollinia puberula: G [G00226077]; iso-, B [B 10 0243129], F [V0047921F], S [fragm. S-R-6899]). INVENTORY DATA (FG). — 33 trees in 27 plots; Fmax <1 %; dbhinv = 38 cm.Published as part of Molino, Jean-François, Sabatier, Daniel, Grenand, Pierre, Engel, Julien, Frame, Dawn, Delprete, Piero G., Fleury, Marie, Odonne, Guillaume, Davy, Damien, Lucas, Eve J. & Martin, Claire A., 2022, An annotated checklist of the tree species of French Guiana, including vernacular nomenclature, pp. 345-903 in Adansonia (3) (3) 44 (26) on page 367, DOI: 10.5252/adansonia2022v44a26, http://zenodo.org/record/745877
Lepidium africanum (Burm. f.) DC.
No full textLepidium africanum (Burm.f.) DC. — Habit: Herb. Habitat: LMDF; up to 2 200 m. Distribution: I. Voucher: N/A. References: Fries & Fries (1927a), Jonsell (1982).Published as part of Zhou, Ya-Dong, Mwachala, Geoffrey, Hu, Guang-Wan & Wang, Qing-Feng, 2022, Annotated checklist of the vascular plants of Mount Kenya, East Africa, pp. 1-108 in Phytotaxa 546 (1) on page 65, DOI: 10.11646/phytotaxa.546.1.1, http://zenodo.org/record/655046
Restructuring the existing medium voltage distribution grids using DC systems
No full textGreen Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.DC systems, Energy conversion & Storag
Cold cracking in DC-cast high strength aluminum alloy ingots: An intrinsic problem intensified by casting process parameters
No full textFor almost half a century the catastrophic failure of direct chill (DC) cast high strength aluminum alloys has been challenging the production of sound ingots. To overcome this problem, a criterion is required that can assist the researchers in predicting the critical conditions which facilitate the catastrophic failure of the ingots. This could be achieved at first glance by application of computer simulations to assess the level and distribution of residual thermal stresses. However, the simulation results are only able to show the critical locations and conditions where and when high stresses may appear in the ingots. The prediction of critical void/crack size requires simultaneous application of fracture mechanics. In this paper, we present the thermo-mechanical simulation results that indicate the critical crack size distribution in several DC-cast billets cast at various casting conditions. The simulation results were validated upon experimental DC-casting trials and revealed that the existence of voids/cracks with a considerable size is required for cold cracking to occur.Materials Science & EngineeringMechanical, Maritime and Materials Engineerin
A Dynamically Reconfigurable Recursive Switched-Capacitor DC-DC Converter with Adaptive Load Ability Enhancement
No full textMultiple voltage conversion ratio (VCR) recursive switched-capacitor (SC) dc-dc converters, based on several basic 2:1 converters, are widely used for on-chip power supplies due to their flexible VCRs for higher energy efficiency. However, conventional multiple VCR SC converters usually have one or more 2:1 converters unused for some VCRs, which results in lower power density and chip area wastage. This article presents a new recursive dc-dc converter system, which can dynamically reconfigure the connection of all on-chip 2:1 converter cells so that the unused converters in the conventional designs can be reused in this new architecture for increasing the load-driving capacity, power density, and power efficiency. To validate the design, a 4-bit-input 15-ratio system was designed and fabricated in a 180-nm BCD process, which can support a maximum load current of \text{0.71}\,\text{mA} and achieves a peak power efficiency of 93.1% with 105.3\,\mu \text{A/mm} {2} chip power density from a 2-V input power supply. The measurement results show that the load-driving capacity can become 6.826×, 2.236×, and 2.175× larger than the conventional topology when the VCR is 1/2, 1/4, and 3/4, respectively. In addition, the power efficiency under these specific VCRs can also be improved considerably.Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Electronic Instrumentatio
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