This study, based on quantitative and qualitative data gathered over a twelve-year period, takes its title from the two predominant styles of gang violence: drive-bys, which have replaced rumbles as the primary form of gang violence; and gang-bangs--a generic term for other gang violence that includes assaults, knifings, and beatings. The author attempts to understand the situations in which a young man would drive up to another human being and, without further ado, blow his head off. By examining hundreds of such situations, and employing both structural and phenomenological analysis, Sanders explores the various configurations of gang violence. Gangbangs and Drive-bys also examines the routines of gang members and their view of life, the different styles of gangs, and changes undergone by gangs from the early 1980s to the end of the same decade. Over that period, the emphasis shifted from parties and paybacks to big money from the sale of rock cocaine, and from unstructured to organized crime. Along with that shift came an increase in the violence. Finally, Sanders traces the beginning and evolution of a metropolitan police gang unit over the same decade in order to present an inside view of how the police attempt to deal with and understand gangs.
This study, based on quantitative and qualitative data gathered over a twelve-year period, takes its title from the two predominant styles of gang violence: 'drive-bys,' which have replaced 'rumbles' as the primary form of gang violence; and 'gang-bangs' - a generic term for other gang violence that includes assaults, knifings, and beatings.The author attempts to understand the situations in which a young man would drive up to another human being and, without further ado, blow his head off. By examining hundreds of such situations, and employing both structural and phenomenological analysis, Sanders explores the various configurations of gang violence.Gangbangs and Drive-bys also examines the routines of gang members and their view of life, the different styles of gangs, and changes undergone by gangs from the early 1980s to the end of the same decade. Over that period, the emphasis shifted from parties and paybacks to big money from the sale of rock cocaine, and from unstructured to organized crime. Along with that shift came an increase in the violence.Finally, Sanders traces the beginning and evolution of a metropolitan police gang unit over the same decade in order to present an inside view of how the police attempt to deal with and understand gangs.
Most prior research testing the hypothesis of the social disorganization theory that residential instability increases crime has used cross-sectional data. Using a unique dataset linking home sales address matched to census tracts with crime data in Los Angeles, we test the direction of this relationship using a six-year panel data design. We also test whether crime acts as a generator of transition and decline in neighborhoods by testing its effect on property values the following year. Our findings suggest little evidence that home sales volatility in one year leads to more property or violent crime the following year. Instead, higher levels of tract property and violent crime in one year lead to more home sales the following year. This effect of high crime rates is exacerbated in tracts with high levels of racial/ethnic heterogeneity, suggesting that such tracts may engender a distinct combination of fear and uncertainty in their residents, leading to more turn over. We also find that tracts with more violent crime one year have lower property values the following year, suggesting a general process of decline.
"Most prior research testing the hypothesis of the social disorganization theory that residential instability increases crime has used cross-sectional data. Using a unique dataset linking home sales address matched to census tracts with crime data in Los Angeles, we test the direction of this relationship using a six-year panel data design. We also test whether crime acts as a generator of transition and decline in neighborhoods by testing its effect on property values the following year. Our findings suggest little evidence that home sales volatility in one year leads to more property or violent crime the following year. Instead, higher levels of tract property and violent crime in one year lead to more home sales the following year. This effect of high crime rates is exacerbated in tracts with high levels of racial/ethnic heterogeneity, suggesting that such tracts may engender a distinct combination of fear and uncertainty in their residents, leading to more turn over. We also find that tracts with more violent crime one year have lower property values the following year, suggesting a general process of decline."
The Islamic State of Iraq and Syria (ISIS), like many street gangs, is the offspring of sectarian conflict. The collapse of the Iraqi state following the US invasion in 2003 and the ongoing Syrian Civil War provided a space or “black hole,” a region lacking strong governance and social control, fertile for ISIS to prosper and mature. Over the last decade, ISIS’s organisational composition has evolved from a terror group into a bureaucratically led caliphate governing a shell-state. ISIS’s transformation into a provider of extra-legal governance managing a shell-state, has produced a group structure typical of bureaucratic organisations with checks-and-balances that facilitate functionality. ISIS’s active participants are predominantly foreign-born and “in their late teens and early twenties”. Males remain ISIS’s largest demographic, even though the group is not limiting enrollments. ISIS’s territorial control has allowed the group to expand enlistments to males under the age of 16 in urban centers like Raqqa, Syria.
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A critique of David Foster Wallace’s Authority and American Usage and Peter Turchi’s Maps of the Imagination, reimagining/challenging Standard Written English through poetry that focuses on language, modes of persuasion, identity, and the importance of a writer’s involvement in their text. This is a narrative of a marginalized writer looking for home through writing. These following poems are intended to tell a story and argue for inclusion in authorship and rhetoric amongst a majority straight white community of academia. The poems tackle David Foster Wallace’s Authority and American Usage, which discusses what is Standard Written or “White” English, (SWE). He discusses how SWE is successful writing and that it is the only way writers will be able to considered great writers in academia. I am reluctant to agree, but I still choose to challenge that standard and rewrite one that is fair to all [marginalized] communities that do not have access to the tools to write in this exact manner. The poems also tackle Peter Turchi’s Maps of the Imagination, which tells us to take risks in writing, but does not move outside of the western ideology of writing while also omitting the writing of many authors of color. Through the poetry, I want challenge, criticize and tell a story of how marginalized groups need to get their voice heard while not compromising/negotiating their own personal identity, (avoid whitewashing). Also, the poetry tells a story of privilege because it always exists and
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Baseball managers and umpires don’t always see eye-to-eye. Their on-field confrontations long have been part of the game—and the outcome of those contests. But those confrontations have received scant attention by researchers who focus on the dynamics of the game. This study serves as the sequel to our previous work that applied management and leadership theories in exploring the strategies baseball coaches use to contest an umpire’s decision. We used leadership scholar John E. Barbuto’s concept of influence tactics and the types of social power discussed by sociologists John R. French and Bertram Raven. The use of influence tactics and social power are standard in the workplace between managers and subordinates, managers and their peers, and managers and their supervisors. This study examines the success of those influence tactics—but from the umpire’s perspective. We interviewed 12 umpires who call high school and collegiate games and categorized their findings into four themes: (1) when to approach umpires about a call; (2) how to approach them; (3) how umpires’ age and experience affect their reactions to coaches; and (4) how to show umpires respect. This study, in investigating the interactions of baseball managers and umpires, reinforces congruence theory—that baseball imitates the workplace.
Dwarf galaxies (M*<10^9 Msun) are key drivers of mass assembly in high mass galaxies, but relatively little is understood about the assembly of dwarf galaxies themselves. Using the New Horizon cosmological simulation (40 pc spatial resolution), we investigate how mergers and fly-bys drive the mass assembly and structural evolution of around 1000 field and group dwarfs up to z=0.5. We find that, while dwarf galaxies often exhibit disturbed morphologies (30 and 50 per cent are disturbed at z=1 and z=3 respectively), only a small proportion of the morphological disturbances seen in dwarf galaxies are driven by mergers at any redshift (for 10^9 Msun, mergers drive only 20 per cent morphological disturbances). They are instead primarily the result of interactions that do not end in a merger (e.g. fly-bys). Given the large fraction of apparently morphologically disturbed dwarf galaxies which are not, in fact, merging, this finding is particularly important to future studies identifying dwarf mergers and post-mergers morphologically at intermediate and high redshifts. Dwarfs typically undergo one major and one minor merger between z=5 and z=0.5, accounting for 10 per cent of their total stellar mass. Mergers can also drive moderate star formation enhancements at lower redshifts (up to 5 times at z=1), but this only accounts for 5 per cent of stellar mass in the dwarf regime given their infrequency. Non-merger interactions drive significantly smaller star formation enhancements (around two times), but their preponderance relative to mergers means they account for 10 per cent of stellar mass in the dwarf regime.
Recent studies have shown that novel collective behaviors emerge in complex systems due to the presence of higher-order interactions. However, how the collective behavior of a system is influenced by the microscopic organization of its higher-order interactions is not fully understood. In this work, we introduce a way to quantify the overlap among the hyperedges of a higher-order network, and we show that real-world systems exhibit different levels of intra-order hyperedge overlap. We then study two types of dynamical processes on higher-order networks, namely complex contagion and synchronization, finding that intra-order hyperedge overlap plays a universal role in determining the collective behavior in a variety of systems. Our results demonstrate that the presence of higher-order interactions alone does not guarantee abrupt transitions. Rather, explosivity and bistability require a microscopic organization of the structure with a low value of intra-order hyperedge overlap. Group interactions can lead to explosive onsets of collective behaviors in biological and sociotechnological systems. Here, the authors show that it is the overlap between these kind of higher-order interactions that drives whether emergence of synchrony and epidemics shows up smoothly or abruptly.
Abstract Tumor-specific T cells are crucial in anti-tumor immunity and act as targets for cancer immunotherapies. However, these cells are numerically scarce and functionally exhausted in the tumor microenvironment (TME), leading to inefficacious immunotherapies in most patients with cancer. By contrast, emerging evidence suggested that tumor-irrelevant bystander T (T BYS ) cells are abundant and preserve functional memory properties in the TME. To leverage T BYS cells in the TME to eliminate tumor cells, we engineered oncolytic virus (OV) encoding T BYS epitopes (OV-BYTE) to redirect the antigen specificity of tumor cells to pre-existing T BYS cells, leading to effective tumor inhibition in multiple preclinical models. Mechanistically, OV-BYTE induced epitope spreading of tumor antigens to elicit more diverse tumor-specific T cell responses. Remarkably, the OV-BYTE strategy targeting human severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2)-specific T cell memory efficiently inhibited tumor progression in a human tumor cell-derived xenograft model, providing important insights into the improvement of cancer immunotherapies in a large population with a history of SARS-CoV-2 infection or coronavirus disease 2019 (COVID-19) vaccination.
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The ability to execute high-fidelity operations is crucial to scaling up quantum devices to large numbers of qubits. However, signal distortions originating from nonlinear components in the control lines can limit the performance of single-qubit gates. In this work, we use a measurement based on error amplification to characterize and correct the small single-qubit rotation errors originating from the nonlinear scaling of the qubit drive rate with the amplitude of the programmed pulse. With our hardware, and for a 15-ns pulse, the rotation angles deviate by up to several degrees from a linear model. Using purity benchmarking, we find that control errors reach $2\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}4}$, which accounts for half of the total gate error. Using cross-entropy benchmarking, we demonstrate arbitrary-angle single-qubit gates with coherence-limited errors of $2\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}4}$ and leakage below $6\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}5}$. While the exact magnitude of these errors is specific to our setup, the presented method is applicable to most sources of nonlinearity. Our work shows that the nonlinearity of qubit drive line components imposes a limit on the fidelity of single-qubit gates, independent of improvements in coherence times, circuit design, or leakage mitigation when not corrected for.
ABSTRACT Environmental effects, such as stellar fly-bys and external irradiation, are thought to affect the evolution of protoplanetary discs in clustered star formation. Previous Atacama Large Millimetre/submillimetre Array (ALMA) images at 225 GHz of the ISO-Oph 2 binary revealed a peculiar morphology in the disc of the primary, perhaps due to a possible fly-by with the secondary. Here, we report on new ALMA continuum observations of this system at 97.5, 145, and 405 GHz, which reveal strong morphological variations. Multifrequency positional alignment allows us to interpret these spectral variations in terms of underlying physical conditions. ISO-Oph 2A is remarkably offset from the centroid of its ring, at all frequencies, and the disc is lopsided, pointing at gravitational interactions. However, the dust temperature also varies in azimuth, with two peaks whose direction connects with HD 147889, the earliest-type star in the Ophiuchus complex, suggesting that it is the dominant heat source. The stellar environment of ISO-Oph 2 appears to drive both its density structure and its thermal balance.
Abstract High-speed polarization management is highly desirable for many applications, such as remote sensing, telecommunication, and medical diagnosis. However, most of the approaches for polarization management rely on bulky optical components that are slow to respond, cumbersome to use, and sometimes with high drive voltages. Here, we overcome these limitations by harnessing photonic integrated circuits based on thin-film lithium niobate platform. We successfully realize a portfolio of thin-film lithium niobate devices for essential polarization management functionalities, including arbitrary polarization generation, fast polarization measurement, polarization scrambling, and automatic polarization control. The present devices feature ultra-fast control speeds, low drive voltages, low optical losses and compact footprints. Using these devices, we achieve high fidelity polarization generation with a polarization extinction ratio up to 41.9 dB and fast polarization scrambling with a scrambling rate up to 65 Mrad s −1 , both of which are best results in integrated optics. We also demonstrate the endless polarization state tracking operation in our devices. The demonstrated devices unlock a drastically new level of performance and scales in polarization management devices, leading to a paradigm shift in polarization management.
We quantify Non Fungible Token (NFT) rarity and investigate how it impacts market behaviour by analysing a dataset of 3.7M transactions collected between January 2018 and June 2022, involving 1.4M NFTs distributed across 410 collections. First, we consider the rarity of an NFT based on the set of human-readable attributes it possesses and show that most collections present heterogeneous rarity patterns, with few rare NFTs and a large number of more common ones. Then, we analyze market performance and show that, on average, rarer NFTs: (i) sell for higher prices, (ii) are traded less frequently, (iii) guarantee higher returns on investment, and (iv) are less risky, i.e., less prone to yield negative returns. We anticipate that these findings will be of interest to researchers as well as NFT creators, collectors, and traders.
State-of-the-art exoskeletons are typically limited by low control bandwidth and small range stiffness of actuators which are based on high gear ratios and elastic components (e.g., series elastic actuators). Furthermore, most exoskeletons are based on discrete gait phase detection and/or discrete stiffness control resulting in discontinuous torque profiles. To fill these two gaps, we developed a portable lightweight knee exoskeleton using quasi-direct drive (QDD) actuation that provides 14 Nm torque (36.8% biological joint moment for overground walking). This paper presents 1) stiffness modeling of torque-controlled QDD exoskeletons and 2) stiffness-based continuous torque controller that estimates knee joint moment in real-time. Experimental tests found the exoskeleton had high bandwidth of stiffness control (16 Hz under 100 Nm/rad) and high torque tracking accuracy with 0.34 Nm Root Mean Square (RMS) error (6.22%) across 0-350 Nm/rad large range stiffness. The continuous controller was able to estimate knee moments accurately and smoothly for three walking speeds and their transitions. Experimental results with 8 able-bodied subjects demonstrated that our exoskeleton was able to reduce the muscle activities of all 8 measured knee and ankle muscles by 8.60%-15.22% relative to unpowered condition, and two knee flexors and one ankle plantar flexor by 1.92%-10.24% relative to baseline (no exoskeleton) condition.