Immigration Detainers, Local Discretion, and State Law\u27s Historical Constraints

This thesis is an effort to investigate the operation and the performanceof modular multilevel converters (M2Cs). Proven to be the most promisingtopology in high-voltage high-power applications, it is necessary to put aneffort in understanding the physical laws that govern the internal dynamicsof such converters, in order to design appropriate control methods. AlthoughM2Cs belong to the well-studied family of voltage-source converters (VSCs),and claim a modular structure, their control is significantly more complicatedcompared to two- or three-level VSCs, due to the fact that a much highernumber of switches and capacitors are needed in such a topology. This thesishighlights the important parameters that should be considered when designingthe control for an M2C, through analyzing its internal dynamics, and alsosuggests ways to control such converters ensuring stable operation withoutcompromising the performance of the converter.Special focus is given on ac motor-drive applications as they are very demandingand challenging for the converter performance. Interactions betweenthe internal dynamics and the dynamics of the driven motor are experimentallyinvestigated. The problem of operating the converter when connectedto a motor standing still is visited, even under the condition that a greatamount of torque and current are requested, in order to provide an idea forthe converter requirements under such conditions. Finally, an optimization ofthe converter operation is suggested in order to avoid overrating the convertercomponents in certain operation areas that this is possible.All analytical investigations presented in this thesis are confirmed by experimentalresults on a laboratory prototype converter, which was developedfor the purposes of this project. Experimental verification proves the validityof the theoretical investigations, as well as the correct performance of thecontrol methods developed during this project on a real, physical converter,hoping that the results of this thesis will be useful for large-scale implementations,in the mega- or even giga-watt power range.Denna avhandling är ett försök att undersöka drift och egenskaper avmodulära multinivåomvandlare (M2C:er). Eftersom denna topologi anses varaden mest lovande inom högspänings-högeffekt-tillämpningar är, och somett underlag för att kunna formulera lämpliga styrmetoder, är det nödvändigtatt lägga kraft i att försöka förståde fysikaliska lagar som styr den inredynamiken i sådana omvandlare. Även om M2C:erna tillhör den välstuderadefamiljen av spänningsstyva omvandlare (VSC:er), och har en modulärstruktur, är deras reglering avsevärt mer komplicerad jämfört med två- ellertre-nivåomvandlare, eftersom ett mycket större antal switchar och kondensatorerär nödvändiga i en sådan topologi. Denna avhandling sätter fingretpå de parametrar som måste beaktas när man konstruerar regleringen för enM2C, genom att analysera den interna dynamiken, samt att föreslå sätt attstyra sådana omvandlare såatt stabil drift kan säkerställas utan att negativtpåverka prestanda.Ett speciellt fokus läggs på växelströmsmotordrifter eftersom de är särskiltutmanande vad gäller prestanda. Växelverkan mellan den interna dynamikenoch motorns dynamik undersöks experimentellt. Problemet att driva motornvid stillestånd behandlas även i fallet med hög ström och högt moment för atterhålla kunskap om kraven påomvandlaren i sådana fall. Slutligen föreslås enoptimering av omvandlarens drifttillstånd för att undvika överdimensioneringav omvandlarens komponenter i de fall detta är möjligt.Alla analytiska undersökningar som läggs fram i denna avhandling är bekräftadegenom experimentella resultat från en laboratorieomvandlare, somutvecklats inom ramen för detta arbete. Den experimentella verifieringen bevisargiltigheten av alla teoretiska undersökningar. Den visar också på demycket goda prestanda som de utvecklade styrmetoderna har vid drift aven verklig fysisk omvandlare. Förhoppningen är att resultaten från detta arbetekan komma till använding i storskaliga implementerinar i mega- ellergiga-wattklassen.QC 20141201</p

The Red Supergiant Content of M31

We investigate the red supergiant (RSG) population of M31, obtaining radial velocities of 255 stars. These data substantiate membership of our photometrically-selected sample, demonstrating that Galactic foreground stars and extragalactic RSGs can be distinguished on the basis of B-V, V-R two-color diagrams. In addition, we use these spectra to measure effective temperatures and assign spectral types, deriving physical properties for 192 RSGs. Comparison with the solar-metallicity Geneva evolutionary tracks indicates astonishingly good agreement. The most luminous RSGs in M31 are likely evolved from 25-30 Mo stars, while the vast majority evolved from stars with initial masses of 20 Mo or less. There is an interesting bifurcation in the distribution of RSGs with effective temperatures that increases with higher luminosities, with one sequence consisting of early K-type supergiants, and with the other consisting of M-type supergiants that become later (cooler) with increasing luminosities. This separation is only partially reflected in the evolutionary tracks, although that might be due to the mis-match in metallicities between the solar Geneva models and the higher-than-solar metallicity of M31. As the luminosities increase the median spectral type also increases; i.e., the higher mass RSGs spend more time at cooler temperatures than do those of lower luminosities, a result which is new to this study. Finally we discuss what would be needed observationally to successfully build a luminosity function that could be used to constrain the mass-loss rates of RSGs as our Geneva colleagues have suggested.Comment: Accepted for publication in the Astronomical Journa

Drawing Lines among the Persecuted

Should a victim of persecution be denied protection in the United States if his persecutors forced him to participate in their campaign of terror? In its 2009 decision, Negusie v. Holder, the Supreme Court recognized the “difficult line drawing problems” presented by this question, but failed to offer concrete guidance to the lower courts or the executive agencies charged with drawing those lines. Circuit courts employ a variety of standards, leaving the law in disarray. This Article offers original historical research to argue that asylum seekers charged with participating in persecution should be afforded a duress defense. It traces the bar to refugee protection for persecutors back to its initial appearance in the Constitution of the International Refugee Organization and examines, for the first time, documents preserved in the French National Archive, which reveal that a requirement for personal culpability has been present since the bar’s inception. The legislative history of the persecutor bar in U.S. law shows that the bar was intended to be interpreted consistently with the standards for excluding persecutors under the Constitution of the International Refugee Organization, the U.N. Convention and Protocol on Refugees, and the war crimes jurisprudence of the Nuremburg Tribunals. All three sources lead to the same conclusion: the persecutor bar should include the defense of duress as a means of separating those who possessed a moral choice to refuse to persecute others from those who did not. A duress defense reconciles the statute’s meaning with its historical roots, international treaty obligations, and the application of similar provisions in immigration law. Further, it provides a principled standard with which to draw the difficult lines the law requires and offers protection to those in need

Immigration Detainers, Local Discretion, and State Law’s Historical Constraints

The Trump administration’s aggressive immigration enforcement campaign calls on hundreds of thousands of local police officers and county sheriffs to identify and detain people suspected of violating federal civil immigration law. The immigration detainer is a key mechanism of Trump’s campaign and is on the rise. A detainer asks local law enforcement officers to hold individuals beyond the period authorized by local law so that federal immigration officials have additional time to take custody of the person. In practice, detainers attach the threat of deportation to any contact with local police. Immigrant rights advocates have challenged the use of detainers with mounting success. As the contest over detainers continues, the battle lines are shifting from federal to state law with officials now searching for authority in states’ earliest attempts to regulate local arrest authority and cooperation of local law enforcement agencies in jailing federal prisoners. This article presents the first examination of these state and territorial laws along with the historical limits they place on local law enforcement officers. By resurrecting this history, the article reveals that the laws of most states fail to authorize detainer enforcement. Rather, local immigration policing would require new and specific authority. Expanding the role of local law enforcement officers beyond their traditional constraints, however, comes at a substantial cost. Structurally, it erodes the benefits of individual liberty, political accountability, and uniformity promised by federal immigration control. Individually, it leaves the fate of an immigrant at a traffic stop to the discretion of a local officer and forces families to navigate a patchwork of local immigration policy. This article argues instead that maintaining the traditional scope of state police power better protects the safety and civil rights of immigrant communities

The release of a captive-raised female African Elephant <em>(Loxodonta africana</em>) in the Okavango Delta, Botswana

Wild female elephants live in close-knit matrilineal groups and housing captive elephants in artificial social groupings can cause significant welfare issues for individuals not accepted by other group members. We document the release of a captive-raised female elephant used in the safari industry because of welfare and management problems. She was fitted with a satellite collar, and spatial and behavioural data were collected over a 17-month period to quantify her interactions with the wild population. She was then monitored infrequently for a further five-and-a-half years. We observed few signs of aggression towards her from the wild elephants with which she socialized. She used an area of comparable size to wild female elephants, and this continued to increase as she explored new areas. Although she did not fully integrate into a wild herd, she had three calves of her own, and formed a social unit with another female and her calf that were later released from the same captive herd. We recommend that release to the wild be considered as a management option for other captive female elephants

Out of the drought: Australia's junior verse novels

After the first flush of verse novels for young adults (YA) in the 1990s has died down, verse novels in Australia for junior readers have sprouted. In 2010 Lorraine Marwood won the inaugural Children’s Fiction category of the Prime Minister’s Literary Awards for Star Jumps

Outside

Poem which one First Place in the 2012 Gawler Poetry Competition, Adult Section

Open Access Survival Guide for Academics and Researchers

This guide outlines the basics of open access and what you need to know about funder policies