cssi/SciSciGPT-SciSciNet huggingface dataset:
Marriage and Marriage Markets

This paper reviews models of marriage, with special emphasis on how the sex ratio (the ratio of marriageable men to women) can help explain measurable outcomes such as marriage formation, intra-marriage distribution of consumption goods, savings, labor supply, leisure, type of relationship, divorce, and intermarriage. Predictions are based on Demand and Supply analyses by Becker and the author. Evidence in support of the predictions is reported, most of it based on recent literature.
Regional and temporal variability of melts during a Cordilleran magma pulse: Age and chemical evolution of the Jurassic arc, eastern Mojave Desert, California

Intrusive rock sequences in the central and eastern Mojave Desert segment of the Jurassic Cordilleran arc of the western United States record regional and temporal variations in magmas generated during the second prominent pulse of Mesozoic continental arc magmatism. U/Pb zircon ages provide temporal control for describing variations in rock and zircon geochemistry that reflect differences in magma source components. These source signatures are discernible through mixing and fractionation processes associated with magma ascent and emplacement. The oldest well-dated Jurassic rocks defining initiation of the Jurassic pulse are a 183 Ma monzodiorite and a 181 Ma ignimbrite. Early to Middle Jurassic intrusive rocks comprising the main stage of magmatism include two high-K calc-alkalic groups: to the north, the deformed 183–172 Ma Fort Irwin sequence and contemporaneous rocks in the Granite and Clipper Mountains, and to the south, the 167–164 Ma Bullion sequence. A Late Jurassic suite of shoshonitic, alkali-calcic intrusive rocks, the Bristol Mountains sequence, ranges in age from 164 to 161 Ma and was emplaced as the pulse began to wane. Whole-rock and zircon trace-element geochemistry defines a compositionally coherent Jurassic arc with regional and secular variations in melt compositions. The arc evolved through the magma pulse by progressively greater input of old cratonic crust and lithospheric mantle into the arc magma system, synchronous with progressive regional crustal thickening.
BONE GRAFTS AND THEIR SUBSTITUTES: UNDERSTANDING THE THREE O'S

Bone is a dynamic organ with remarkable regenerative properties seen only otherwise in the liver. However, bone healing requires vascularity, stability, growth factors, a matrix for growth, and viable cells to obtain effective osteosynthesis. We rely on these principles not only to heal fractures, but also achieve healing of benign bone defects. Unfortunately, we are regularly confronted with situations where the local environment and tissue is insufficient and we must rely on our “biologic tool box.” When the process of bone repair requires additional assistance, we often look to bone grafting to provide an osteoconductive, osteoinductive, and/or osteogenic environment to promote bone healing and repair. The primary workhorses of bone grafting include autogenous bone, cadaver allograft, and bone graft substitutes. Among the first types of bone graft used and still used in large quantities today include autogenous and cadaver allograft bone. Allografts are useful because they are present in multiple forms that conform to the desired situation. But autogenous bone graft is considered the gold standard because it possesses all the fundamental properties to heal bone. However, it has been associated with high rates of donor site morbidity and typically requires an inpatient hospitalization following the procedure only adding to the associated costs. The first bone graft substitute used was calcium sulfate in 1892, and over the past 122 years advancements have achieved improved material properties of calcium sulfate and helped usher in additional bioceramics for bone grafting. Today there are predominantly four types of bioceramics available, which include calcium sulfate, calcium phosphate, tricalcium phosphate, and coralline hydroxyapatite. They come in multiple forms ranging from pellets and solid blocks to injectable and moldable putty. In comparison to autogenous bone graft, the primary limitation of bioceramics are the lack of osteogenic and osteoinductive properties. Bioceramics work by creating an osteoconductive scaffold to promote osteosynthesis. The options of bone graft substitutes don9t end with these four types of bioceramics. Composite bioceramics take advantage of the differing biomechanical properties of these four basis types of bioceramics to develop improved materials. To overcome the lack of osteoinductive and osteogenic properties growth factors or bone marrow aspirate can be added to the bioceramic. As a result, the list of combinations available in our “biologic tool box” continues to expand. More than 20 BMPs have been identified, but only BMP-2 and BMP-7 have FDA approval. As we look forward to areas of future research and need within orthobiologics, some will likely come in the near future while others are much further in the future. We will continue to strive for the ideal bone graft substitute, which will have similar osteoinductive properties as autograft. The ultimate bone graft substitute will likely involve stem cells because it will allow an alternative to autogenous bone with the same osteogenic potential.
Representation and Salary Gaps by Race-Ethnicity and Gender at Selective Public Universities

We use data from 2015–2016 to document faculty representation and wage gaps by race-ethnicity and gender in six fields at selective public universities. Consistent with widely available information, Black, Hispanic, and female professors are underrepresented and White and Asian professors are overrepresented in our data. Disadvantaged minority and female underrepresentation is driven predominantly by underrepresentation in science and math intensive fields. A comparison of senior and junior faculty suggests a trend toward greater diversity, especially in science and math intensive fields, because younger faculty are more diverse. However, Black faculty are an exception. We decompose racial-ethnic and gender wage gaps and show that academic field, experience, and research productivity account for most or all of the gaps. We find no evidence of wage premiums for individuals who improve diversity, although for Black faculty we cannot rule out a modest premium.
Low-molecular weight heparin versus vitamin K antagonists for the treatment of cancer-associated thrombosis: A cost-effectiveness analysis.

Abstract Introduction Cancer-associated venous thromboembolism (VTE) is primarily treated with low-molecular weight heparin (LMWH), a strategy based on studies showing it to be superior to the vitamin K antagonist (VKA) warfarin for preventing VTE recurrence. Subsequent analyses suggest that the magnitude of this benefit might be less than previously determined. Neither patient-focused measures of utility nor the costs of each strategy have been evaluated in the current treatment era. Methods This is a cost-effectiveness analysis of VKA and LMWH for the treatment of cancer-associated thrombosis through use of a microsimulation model of outcomes for competing anticoagulation management strategies from a 2014 United States societal perspective. Results LMWH therapy added 0.27 QALYs relative to VKA treatment with an ICER of $217,007. One-way sensitivity analysis evaluating the utility of LMWH revealed that VKA was always the preferred strategy at a willingness to pay (WTP) threshold of $100,000 per QALY. Limitations include that the model incorporates a low VKA time in therapeutic range (TTR) and that the TTR in some centers may be higher thereby increasing the cost-effectiveness of the VKA strategy. Utilities for anticoagulation strategies were not derived from cancer patients, and preference is known to vary depending on how anticoagulation method is integrated with cancer treatment. Conclusions Our findings suggest that compared to LMWH, warfarin is a more cost-effective strategy to treat cancer-associated VTE. Although LMWH is associated with a modest increase in life expectancy, this increase comes at significant cost.
Improving Metacomprehension Accuracy in an Undergraduate Course Context

Students tend to have poor metacomprehension when learning from text, meaning they are not able to distinguish between what they have understood well and what they have not. Although there are a good number of studies that have explored comprehension monitoring accuracy in laboratory experiments, fewer studies have explored this in authentic course contexts. This study investigated the effect of an instructional condition that encouraged comprehension-test-expectancy and self-explanation during study on metacomprehension accuracy in the context of an undergraduate course in research methods. Results indicated that when students received this instructional condition, relative metacomprehension accuracy was better than in a comparison condition. In addition, differences were also seen in absolute metacomprehension accuracy measures, strategic study behaviors, and learning outcomes. The results of the current study demonstrate that a condition that has improved relative metacomprehension accuracy in laboratory contexts may have value in real classroom contexts as well. (PsycINFO Database Record
Delineation of a Coal Burn Edge With Seismic Refraction

Coal seams in many areas of western United States have ignited and burned for considerable distances underground. The boundary between the coal and clinker needs to be defined for determination of reserves. Field tests of a seismic refraction method were conducted at Kerr-McGee Coal Corp's open pit Clovis Point mine near Gillette, Wyoming. Explosive sources were detonated in shot holes in the pit floor. Geophone lines, laid on the surface beyond the edge of the pit, crossed from an area of known coal to an area of clinker. Delays in arrival times correlated with the expected beginning of the clinker zone. Waves passing through the clinker also exhibit a significant attenuation. A magnetic survey concluded along the seismic lines showed anomalies in the regions where seismic data indicated the burn edge.
A Crowdsourcing Approach to Collecting Tutorial Videos -- Toward Personalized Learning-at-Scale

We investigated the feasibility of crowdsourcing full- fledged tutorial videos from ordinary people on the Web on how to solve math problems related to logarithms. This kind of approach (a form of learnersourcing [9, 11]) to efficiently collecting tutorial videos and other learning resources could be useful for realizing personalized learning-at-scale, whereby students receive specific learning resources -- drawn from a large and diverse set -- that are tailored to their individual and time-varying needs. Results of our study, in which we collected 399 videos from 66 unique "teachers" on Mechanical Turk, suggest that (1) approximately 100 videos -- over 80% of which are mathematically fully correct -- can be crowdsourced per week for $5/video; (2) the average learning gains (posttest minus pretest score) associated with watching the videos was stat. sig. higher than for a control video (0.105 versus 0.045); and (3) the average learning gains (0.1416) from watching the best tested crowdsourced videos was comparable to the learning gains (0.1506) from watching a popular Khan Academy video on logarithms.
Plausible deniability for privacy-preserving data synthesis

Releasing full data records is one of the most challenging problems in data privacy. On the one hand, many of the popular techniques such as data de-identification are problematic because of their dependence on the background knowledge of adversaries. On the other hand, rigorous methods such as the exponential mechanism for differential privacy are often computationally impractical to use for releasing high dimensional data or cannot preserve high utility of original data due to their extensive data perturbation.This paper presents a criterion called plausible deniability that provides a formal privacy guarantee, notably for releasing sensitive datasets: an output record can be released only if a certain amount of input records are indistinguishable, up to a privacy parameter. This notion does not depend on the background knowledge of an adversary. Also, it can efficiently be checked by privacy tests. We present mechanisms to generate synthetic datasets with similar statistical properties to the input data and the same format. We study this technique both theoretically and experimentally. A key theoretical result shows that, with proper randomization, the plausible deniability mechanism generates differentially private synthetic data. We demonstrate the efficiency of this generative technique on a large dataset; it is shown to preserve the utility of original data with respect to various statistical analysis and machine learning measures.
Data abstraction, data bases and conceptual modelling (Position Paper)

There is no paper with a mathematical foundation that I know of that strikes more at the heart of the subject of this Workshop than that of R.M. Burstall and J.A. Goguen [10], presented at the Fifth International Joint Conference on Artificial Intelligence in August of 1977.
READMISSION FOLLOWING TOTAL KNEE ARTHROPLASTY: VENOUS THROMBOEMBOLISM AS A “NEVER EVENT” IS A COUNTERPRODUCTIVE MISNOMER

A national quality improvement initiative identified potentially avoidable complications, including venous thromboembolism (VTE) as “never events.” While the intent of this designation was to improve system-wide performance and to decrease medical costs, its value in total joint arthroplasty has not been defined. We performed this study to assess the relative incidence of VTE related admissions following TKA, the relative costs associated with care directed towards this complication, and compliance with SCIP VTE prophylaxis guidelines. From a total of 2,221 TKA procedures accomplished over a 5 year interval, we identified 121 hospital readmissions (5.4 percent). Primary readmission diagnoses were obtained from hospital coding and physician medical record documentation. Readmissions were categorised into five major complication types: 1) limited motion, 2) noninfectious wound complications, 3) bleeding complications, 4) deep infections, and 5) VTE events. VTE chemoprophylaxis was reviewed to determine the agent utilised, therapeutic level, and duration. Hospital records were assessed to determine whether additional surgeries or other procedures were accomplished and whether patients received allogeneic transfusions during their readmission. Direct costs of readmission care were obtained from hospital reimbursement records. Limited motion (18%), non-infectious wound complication (14%), surgical site infection (10%), and bleeding (10%) were the most common reasons for readmission. VTE events were less frequent (3%) and all occurred despite standard of care prophylaxis. The cost to manage bleeding, wound complications, infection, and limited motion each exceeded the cost of VTE. These results challenge the identification of VTE as a “never event.”
Perceptions and Price: Evidence from CEO Presentations at IPO Roadshows

This paper examines the relation between cognitive perceptions of management and firm valuation. We develop a composite measure of investor perception using 30-second content-filtered video clips of initial public offering (IPO) roadshow presentations. We show that this measure, designed to capture viewers’ overall perceptions of a CEO, is positively associated with pricing at all stages of the IPO (proposed price, offer price and end of first day of trading). The result is robust to controls for traditional determinants of firm value. We also show that firms with highly perceived management are more likely to be matched to high-quality underwriters. In further exploratory analyses, we find the impact is greater for firms with more uncertain language in their written S-1. Taken together, our results provide evidence that investors’ instinctive perceptions of management are incorporated into their assessments of firm value. This article is protected by copyright. All rights reserved
A note on pre-play communication ☆

Abstract Consider a finite two-player game with one round of communication. Restrict players to a subset of “monotonic” strategies. The paper justifies this restriction. The paper provides sufficient conditions under which the strategies of the restricted game that survive iterative deletion of weakly dominated strategies favor the agent who can communicate.
Bessel models for general admissible induced representations: the compact stabilizer case

A holomorphic continuation of Jacquet type integrals for parabolic subgroups with abelian nilradical is studied. Complete results are given for generic characters with compact stabilizer and arbitrary representations induced from admissible representations. A description of all pertinent examples is given. These results give a complete description of the Bessel models corresponding to compact stabilizer.
A Note on Euclidean Order Types

Euclidean functions with values in an arbitrary well-ordered set were first considered by Motzkin in 1949 and studied in more detail by Samuel and Nagata in the 1970’s and 1980’s. Here these results are revisited, simplified, and extended. The main themes are (i) consideration of O r d-valued functions on an Artinian poset and (ii) use of ordinal arithmetic, including the Hessenberg-Brookfield ordinal sum. To any Euclidean ring we associate an ordinal invariant, its Euclidean order type, and we initiate a study of this invariant, especially for Euclidean rings which are not domains.
Really effective (for 15% of the men): Lessons in understanding and addressing user needs in climate services from Mali

The design of effective climate services requires the identification of a problem that might be addressed through the provision of weather and climate information, and the design and delivery of actionable information to a set of appropriate users. The utility of weather and climate information for a given user is shaped not only by exposure to particular weather, climate, and market shocks and stresses, but also the sensitivity of that user’s livelihoods to particular shocks and stresses and whether or not their adaptive capacity includes the ability to use such information. Therefore, effective climate services are very place-, time-, and vulnerability-specific, and required careful social scientific investigation into user needs as part of the design process. Such investigation is also critical to the monitoring and evaluation of such projects, for they may lose their efficacy when applied to challenges or user communities other than those for which they were designed. This article uses the example of Mali’s agrometeorological advisory program to illustrate these points. This program, designed during a severe drought in the late 1970s and early 1980s, sought to address acute food insecurity by boosting food availability through yield increases. This design achieved its goals by targeting the users (senior men who owned their own agricultural equipment) who were most able to make rapid changes to the production of staple grains. It is only in the contemporary context of resilience programming and an increasing concern for climate change adaptation that the relatively small, highly gendered set of users able to engage with this climate service became a lens through which to view this program as a failure. The contemporary challenge for the program, and indeed any climate service aimed at addressing vulnerabilities produced by a variable, changing climate, lies in how it might remain relevant as our understanding of the dynamics of food security have shifted away from a focus on food availability, the weather- and climate-related stresses most important to agrarian populations shift with the changing climate, and our concerns for resilience demand that this program reach a much wider set of users and serve a broader set of needs than initially imagined.
Understanding Traffic Density from Large-Scale Web Camera Data

Understanding traffic density from large-scale web camera (webcam) videos is a challenging problem because such videos have low spatial and temporal resolution, high occlusion and large perspective. To deeply understand traffic density, we explore both optimization based and deep learning based methods. To avoid individual vehicle detection or tracking, both methods map the dense image feature into vehicle density, one based on rank constrained regression and the other based on fully convolutional networks (FCN). The regression based method learns different weights for different blocks of the image to embed road geometry and significantly reduce the error induced by camera perspective. The FCN based method jointly estimates vehicle density and vehicle count with a residual learning framework to perform end-to-end dense prediction, allowing arbitrary image resolution, and adapting to different vehicle scales and perspectives. We analyze and compare both methods, and get insights from optimization based method to improve deep model. Since existing datasets do not cover all the challenges in our work, we collected and labelled a large-scale traffic video dataset, containing 60 million frames from 212 webcams. Both methods are extensively evaluated and compared on different counting tasks and datasets. FCN based method significantly reduces the mean absolute error (MAE) from 10.99 to 5.31 on the public dataset TRANCOS compared with the state-of-the-art baseline.
Time Dependent Debonding of Aluminum/Alumina Interfaces under Cyclic and Static Loading

The structural integrity of oxide/metal interfaces is important in many applications. While most attention has focused on the debonding of oxide/metal interfaces by conducting strength and fracture toughness tests, very few investigations have looked at time dependant failure of interfaces under cyclic or static loading. Tests have been conducted on sandwich specimens consisting of 5 - 100 micron thick aluminum layers bonded between either polycrystalline or single crystal Al 2 O 3 to determine cyclic fatigue-crack growth, as well as static loaded moisture- assisted crack-growth, properties of Al/Al 2 O 3 interfaces. Under cyclic loading, crack growth was observed to occur predominantly by interfacial debonding, but was also observed to make excursions into the Al 2 O 3 . Static loading in a moist environment also caused interfacial cracks to deviate into the Al 2 O 3 or alternatively to arrest. Due to the poor crack growth resistance of the Al 2 O 3 , cracks leaving the interface grew at faster rates than those at the interface. Trends in crack trajectories and crack growth rates are explained in terms of the degree of plastic constraint in the aluminum layer, the modulus mismatch, and the effects of environmental mechanisms.
Decentralizing Eligibility for a Federal Antipoverty Program: A Case Study for China

In theory, the informational advantage of decentralizing the eligibility criteria for a federal antipoverty program could come at a large cost to the program's performance in reaching the poor nationally. Whether this happens in practice depends on the size of the local-income effect on the eligibility cutoffs. China's Di Bao program provides a case study. Poorer municipalities adopt systematically lower thresholds roughly negating intercity differences in need for the program and generating considerable horizontal inequity, so that poor families in rich cities fare better. The income effect is not strong enough to undermine the program's overall poverty impact; other factors, including incomplete coverage of those eligible, appear to matter more.
Knowledge Rich Natural Language Queries over Structured Biological Databases

Increasingly, keyword, natural language and NoSQL queries are used for information retrieval from both traditional and non-traditional databases such as web, document, GIS, legal, and health databases. While their popularity are undeniable for obvious reasons, their engineering is far from simple. In most part, semantics and intent preserving mapping of a well understood natural language query expressed over a structured database schema to a structured query language is still a difficult task, and research to tame the complexity is intense. In this paper, we propose a multi-level knowledge-based middleware to facilitate such mappings that separate the conceptual level from the physical level. We augment these multi-level abstractions with a concept reasoner and a query strategy engine to dynamically link arbitrary natural language querying to well defined structured queries. We demonstrate the feasibility of our approach by presenting a Datalog based prototype system, called BioSmart, that can compute responses to arbitrary natural language queries over arbitrary databases once a syntactic classification of the natural language query is made.
Large scale evolution of convolutional neural networks using volunteer computing

This work presents a new algorithm called evolutionary exploration of augmenting convolutional topologies (EXACT), which is capable of evolving the structure of convolutional neural networks (CNNs). EXACT is in part modeled after the neuroevolution of augmenting topologies (NEAT) algorithm, with notable exceptions to allow it to scale to large scale distributed computing environments and evolve networks with convolutional filters. In addition to multithreaded and MPI versions, EXACT has been implemented as part of a BOINC volunteer computing project, allowing large scale evolution. During a period of two months, over 4,500 volunteered computers on the Citizen Science Grid trained over 120,000 CNNs and evolved networks reaching 98.32% test data accuracy on the MNIST handwritten digits dataset. These results are even stronger as the backpropagation strategy used to train the CNNs was fairly rudimentary (ReLU units, L2 regularization and Nesterov momentum) and these were initial test runs done without refinement of the backpropagation hyperparameters. Further, the EXACT evolutionary strategy is independent of the method used to train the CNNs, so they could be further improved by advanced techniques like elastic distortions, pretraining and dropout. The evolved networks are also quite interesting, showing "organic" structures and significant differences from standard human designed architectures.
Natural convection cooling for offshore nuclear power plants

A preliminary evaluation of the use of natural convection cooling to remove waste heat from offshore nuclear power plants is presented. This approach would minimize the environmental problems of th...
Greening cultural policy

This article focuses on greening cultural policy within a sustainable development context. We examine shortcomings of major public-policy responses to the ecological crisis, linking this to the ambivalent philosophical heritage of anthropocentric worldviews that underpin ideas about the relation of culture to non-human nature. This ambivalence is reflected by weak environmentalism in the cultural policy arena, exemplified by surprisingly non-green cultural platforms espoused by green political parties. Green thinking is further hampered by the widespread adoption of digitisation within cultural organizations, which we contextualise in the broader political economy of digital capitalism and the attendant myth that high-tech culture is a low emissions business. Green cultural policy necessitates intensive self-examination of cultural institutions’ environmental impact, at the same time these institutions deploy art, education, entertainment, sports, and news to raise awareness of ecological crisis and alternative models of economic activity. We cite the efforts of activist artists’ resistance against fossil fuel corporations’ sponsorship of arts and cultural organizations as a welcome provocation for greening cultural policy within cultural organizations and green political parties alike.
Growing and Learning When Consumption Is Seasonal: Long-Term Evidence From Tanzania.

This article shows that the seasonality of food consumption during childhood, conditional on average consumption, affects long-run human capital development. We develop a model that distinguishes differences in average consumption levels, seasonal fluctuations, and idiosyncratic shocks, and estimate the model using panel data from early 1990s Tanzania. We then test whether the mean and seasonality of a child’s consumption profile affect height and educational attainment in 2010. Results show that the negative effects of greater seasonality are 30 % to 60 % of the magnitudes of the positive effects of greater average consumption. Put differently, children expected to have identical human capital based on annualized consumption measures will have substantially different outcomes if one child’s consumption is more seasonal. We discuss implications for measurement and policy.
A model of Bayesian persuasion with transfers

Abstract We analyze a persuasion game in which a sender wants to persuade a receiver to take an action. The sender first produces information about the benefits of taking the action and then offers monetary transfers to the receiver. We characterize a sender-optimal information structure and show that limiting monetary payments may incentivize the sender to produce more information.
Jet Substructure Studies with CMS Open Data

The first analysis of public data from the CMS experiment at the LHC probes the substructures of jets produced in proton-proton collisions recorded in 2010.
Weakening and Shifting of the Saharan Shallow Meridional Circulation During Wet Years of the West African Monsoon

AbstractThe correlation between increased Sahel rainfall and reduced Saharan surface pressure is well established in observations and global climate models, and has been used to imply that increased Sahel rainfall is caused by a stronger shallow meridional circulation (SMC) over the Sahara. This study uses two atmospheric reanalyses to examine interannual variability of Sahel rainfall and the Saharan SMC, which consists of northward near-surface flow across the Sahel into the Sahara and southward flow near 700 hPa out of the Sahara. During wet Sahel years, the Saharan SMC shifts poleward, producing a drop in low-level geopotential and surface pressure over the Sahara. Statistically removing the effect of the poleward shift from the low-level geopotential eliminates significant correlations between this geopotential and Sahel precipitation. As the Saharan SMC shifts poleward, its mid-tropospheric divergent outflow decreases, indicating a weakening of its overturning mass flux. The poleward shift and weaken...
Stochastic phase segregation on surfaces.

Phase separation and coarsening is a phenomenon commonly seen in binary physical and chemical systems that occur in nature. Often, thermal fluctuations, modelled as stochastic noise, are present in the system and the phase segregation process occurs on a surface. In this work, the segregation process is modelled via the Cahn–Hilliard–Cook model, which is a fourth-order parabolic stochastic system. Coarsening is analysed on two sample surfaces: a unit sphere and a dumbbell. On both surfaces, a statistical analysis of the growth rate is performed, and the influence of noise level and mobility is also investigated. For the spherical interface, it is also shown that a lognormal distribution fits the growth rate well.
The HIV-1 Glycan Shield: Strategically Placed Kinks in the Armor Improve Antigen Design

Dense glycosylation on the HIV-1 envelope glycoprotein hampers the induction of broadly neutralizing antibodies against HIV-1. Zhou et al. remove key glycans to unmask sites of vulnerability and enable the induction of neutralizing antibodies.
Do #AllLivesMatter? An Evaluation of Race and Excessive Use of Force by Police

There is anecdotal evidence showing that African-Americans are more likely to be subjected to excessive use of force by police than are people of other races. The counterargument is that these issues are not related to race and there are other factors at work. There have been several high-profile cases, such as those in Ferguson, Cleveland, and Baton Rouge. In this study, we estimate the effect of race on excessive use of force incidents using a new dataset comprising citizen complaints against the Chicago Police Department. Our findings show that not only does race play a role in excessive use of force complaints, but also that race plays a role in which complaints are sustained. Our study also highlights the importance of having data on which to perform rigorous empirical analysis in order to inform policymakers.
An Analysis of Glass Ceiling Perceptions in the Accounting Profession

Access to a deep pool of talent is essential to the success of every professional services firm. The supply of that talent is contingent upon the available rewards for the exercise of that talent, and both the existence of the potential rewards and the beliefs that individuals hold about the existence of the rewards affect the decision to remain in the field. One structural factor that may affect the judgment about whether to remain in a profession concerns promotions based on the gender of the employee (i.e., the “glass ceiling”). In this study, we examine the “glass ceiling” within the context of the accounting profession. While advances have been made within the accounting profession to address the glass ceiling, the continued existence—and perceptions about the continued existence—of the issue exert adverse effects upon the available talent pool and may create long-term problems for the profession. In this study, we investigate glass ceiling perceptions among a large sample of female accounting professionals employed in accounting; the sample includes both public accountants, and those employed in industry accounting. Our study yields the finding of beliefs in bias-driven effects (e.g., a bias against female promotions to the top level), structural effects (e.g., a lack of mentoring opportunities, networking opportunities, and high-profile job assignments), and cultural effects (e.g., a lack of social support from the male leaders within the organization) among these accounting professionals. Glass ceiling perceptions are also influenced by several demographic factors. Furthermore, accounting professionals employed by industry are more likely to report a glass ceiling within their firms than accounting professionals employed by public accounting firms. The findings are of interest to researchers who explore gender-related issues in professional service firms such as the field of accounting, and to senior members of practice who are tasked with ensuring the integrity and quality of the talent pool and the equitable distribution of rewards to employees.
Determination of the magnetic fields of Magellanic X-ray pulsars

The 80 high-mass X-ray binary (HMXB) pulsars that are known to reside in the Magellanic Clouds (MCs) have been observed by the XMM-Newton and Chandra X-ray telescopes on a regular basis for 15 years, and the XMM-Newton and Chandra archives contain nearly complete information about the duty cycles of the sources with spin periods P S < 100 s. We have reprocessed the archival data from both observatories and we combined the output products with all the published observations of 31 MC pulsars with P S < 100 s in an attempt to investigate the faintest X-ray emission states of these objects that occur when accretion to the polar caps proceeds at the smallest possible rates. These states determine the so-called propeller lines of the accreting pulsars and yield information about the magnitudes of their surface magnetic fields. We have found that the faintest states of the pulsars segregate into five discrete groups which obey to a high degree of accuracy the theoretical relation between spin period and X-ray luminosity. So the entire population of these pulsars can be described by just five propeller lines and the five corresponding magnetic moments (0.29, 0.53, 1.2, 2.9 and 7.3, in units of 10 30 G cm 3 ).
Biochemical Contributions to Corrosion of Carbon Steel and Alloy 22 in a Continual Flow System

Microbiologically influenced corrosion (MIC) may decrease the functional lifetime of nuclear waste packaging materials in the potential geologic repository at Yucca Mountain (YM), Nevada. Biochemical contributions to corrosion of package materials are being determined in reactors containing crushed repository-site rock with the endogenous microbial community, and candidate waste package materials. These systems are being continually supplied with simulated ground water. Periodically, bulk chemistries are analyzed on the system outflow, and surfacial chemistries are assessed on withdrawn material coupons. Both Fe and Mn dissolved from C1020 coupons under conditions that included the presence of YM microorganisms. Insoluble corrosion products remained in a reduced state at the coupon surface, indicating at least a localized anoxic condition; soluble reduced Mn and Fe were also detected in solution, while precipitated and spalled products were oxidized. Alloy 22 surfaces showed a layer of chrome oxide, almost certainly in the Cr(III) oxidation state, on microcosm-exposed coupons, while no soluble chrome was detected in solution. The results of these studies will be compared to identical testing on systems containing sterilized rock to generate, and ultimately predict, microbial contributions to waste package corrosion chemistries.
Should Anencephalic Infants be Used as Organ Donors

The frontiers of organ transplantation and its scientific and ethical-legal aspects have advanced to the arena of pediatrics. The technical advances bring with them the problem of organ procurement, with estimates that the discrepancy between supply and demand for pediatric organs will be even more pronounced than in adults. In partial response to this anticipated shortage, it has been proposed that newborns with anencephaly be used as organ donors. 1 In this article the essential elements of this proposal will be briefly described and some of the underlying ethical and legal controversies will be highlighted in the hope that pediatricians will be stimulated to participate with health lawyers, policymakers, and transplantation surgeons in the debate. MEDICAL ASPECTS Significant progress has been made in the transplantation of small organs and the use of immunosuppressive agents in growing children. 2 The prospect now exists that annually in the United States 300 to 450 children with end stage renal disease, 400 to 800 children with liver failure, and 400 to 600 children with complex congenital heart disease may be helped with organ transplantation. 1,3 The supply of usable organs may be limited by asphyxial damage related to the common causes of death in infants, however. Each year, approximately 1,800 babies are born in the United States with anencephaly. 4 Available data suggest that 25% to 45% are live born and at least 95% die within the first week. 5 Apart from their fatal neurologic malformation, their organs are presumed suitable for transplantation. 4 Moreover, prenatal α-fetoprotein and ultrasonographic screening can identify almost all anencephalics with a high level of certainty. 6
Filling Defects in Small Bowel Urinary Conduits

‘All authors: Department of Radiology, Harvard Medical School, Massachusetts General Hospital, Boston MA 021 1 4. Address reprint requests to Radiology Research Office (RCP), Massachusetts General Hospital. AJR 1 37:787-792, October 1981 0361 -803X/81 I 1 374-0787 $00.00 © American Roentgen Ray Society Radiographic evaluation of patients with urinary diversion by small bowel conduit includes excretory urography, loopography, and, if necessary, percutaneous pyelography. Five patients with discrete filling defects in their conduits are discussed. These defects represented stones (two cases), antirefluxing ureteral nipples, metastatic bladder carcinoma, and a ‘ ‘turn-in’ ‘ loop construction defect. While the nature of loop filling defects can often be discerned by radiographic studies and a knowledge of the conduit construction technique, endoscopic biopsy may occasionally be necessary for definitive diagnosis.
Prospects of Therapy for Infections With Human T-Lymphotropic Virus Type III

Human T-lymphotropic virus type III is susceptible to attack at various sites during its replicative cycle. Inhibitors of reverse transcriptase activity, including suramin, antimoniotungstate (HPA-23), and trisodium phosphonoformate, have shown in-vitro activity against the virus in early clinical trials. Other significant antiviral agents are recombinant interferon alpha-A, ribavirin, and ansamycin. Double-blind, placebo-controlled clinical trials of interferon alpha, which inhibits viral replication at easily achievable serum levels, are underway. The development of optimal therapeutic regimens will require carefully controlled, multicenter collaborative trials with standardized criteria for evaluating responses. Prolonged treatment with combinations of antiviral and immunomodulating agents may be necessary for control of HTLV-III replication and for effective treatment of the acquired immunodeficiency syndrome.
Extra-Adrenal Paraganglioma and Pulmonary Chondroma: A Case Report and Review of the Literature

This report describes the findings of an extra-adrenal paraganglioma and chondroma of the lung in an elderly man. Tissue analysis of the paraganglioma showed a high level of catecholamines, as well as the presence of somatostatin and small amounts of other peptide hormones. Immunoperoxidase staining demonstrated the distribution of peptide hormones in the tumor. This case illustrates two important points. First, it confirms the ability of paraganglionic tissue to secrete peptide hormones. Secondary, it adds yet another case to the unusual group of patients described by Carney (Carney JA: Cancer 43:374-382, 1979).
The Normal Forms, Averaging and the Resonance Control of Nonlinear Dynamical Systems

Abstract The generalized normal forms and resonance control methodology is used to analyze and design efficient control of two generic mechanical systems. The first system represents a reduced model arising in nonlinear flexible- body dynamics, while the second describes an unstable regime of aircraft flight relevant to the saddle-node bifurcation. In both cases the initial nonlinear systems have been accurately reduced to integrable averaging normal forms which do not consist of high oscillatory components of solutions. It is shown that such reduction also simplifies a design of the controller and allows it to be obtained in a very efficient way.
Plasma Sialic Acid Alterations in Neoplastic Diseases

The several types of neoplastic transformations are accompanied by alterations in the composition of cell glycoproteins, which are major structural components of cell surfaces. One such observed alteration is in the level of sialic acid on the cell surface. In the present investigation, plasma sialic acid levels were measured in normal volunteers and neoplastic patients using thiobarbituric acid spectrophotometric methods. The mean plasma sialic acid level from 124 normal volunteers was 3.0 mumol/ml. The mean for 20 non-malignant patients was 3.2 mumol/ml. Such observed mean values of sialic acid were 3.7 mumol/ml in 64 breast cancer patients, 5.1 mumol/ml in 22 lung cancer patients, 4.1 mumol/ml in 20 colon patients, and 5.0 mumol/ml in 26 patients having ovarian, cervix, pancreas, prostate, thyroid, uterine, squamous cell, esophageal and endometrial cancers. Serial determinations of plasma sialic acid in 15 patients correlated well with the progression and regression of disease. These results indicate that plasma sialic acid levels are elevated over control levels in the different types of cancer patients studied. Assay of plasma sialic acid is not sensitive enough to be used for screening, but could be used as a prognostic determinant in a variety of neoplastic conditions.
Economic Considerations for Real-Time Aircraft/Avionic Distributed Computer Control Systems

Abstract Using aircraft/avionic systems as examples, economic considerations for Distributed Computer Control Systems (DCCS) are discussed. Centralized, distributed, and federated processing architectures are used as the primary set of systems alternatives from which the economic factors are developed. Technical, schedule, and financial risks for the system architectures are presented. Standardization of computer hardware and software is examined from the economic viewpoint and other related risk factors. The economic impact of subsequent logistic support for standardized computer hardware and software versus non-standard products is identified. System considerations such as reliability, maintainability, availability, build-in-test, fault tolerance, and redundancy are examined from the standpoint of resources available to design and develop the DCCS, and also from the viewpoint of economic impact of failure of the DCCS to perform as expected. The economic impact of external factors such as the rate of technology advancement, technology independence, limited production runs, and the general lack of economic leverage upon the market are examined and related to the life-cycle support requirements of the DCCS. The economic considerations of a DCCS for an aircraft/avionic system application will be used to define similar considerations for an idealized automated process plant.
A Practical Cytopathic Effect/Dye-Uptake Interferon Assay for Routine Use in the Clinical Laboratory

Abstract The clinical value of interferon (IFN) level determinations has been demonstrated, but a practical assay procedure for routine use in the diagnostic laboratory has not been available. The authors examined the susceptibility of five cell lines (WISH, HEp-2, Vero, A549, and WI-26VA4) to vesicular stomatitis virus (VSV) and encephalomyocarditis virus (EMCV), and compared the response of these cells to the inhibitory activity of IFN-alpha and IFN-gamma for the respective viral cytopathic effect (CPE). The WISH-EMCV system was the most sensitive for IFN-alpha, and was approximately as sensitive as the HEp-2-VSV system for IFN-gamma. WISH cells were found to be significantly more sensitive for both IFN-alpha and IFN-gamma when EMCV, instead of VSV, was used (P less than 0.001). Therefore, the latter system served as the basis for developing a CPE dye-uptake procedure that was found to be considerably more rapid but slightly less sensitive than the conventional technic. However, both procedures were equally reproducible and should be suitable for automation.
Autochthonous Prostate Adenocarcinomas in Lobund-Wistar Rats: A Model System

An experimental model system for autochthonous prostate adenocarcinoma (PA) has been developed in Lobund-Wistar (L-W) rats. Large primary PAs were induced in 31 of 40 (77.5%) L-W rats within an average of 10.7 months after a single dose of methylnitrosourea (MNU) and subcutaneous implants of testosterone. Metastatic tumors had developed in over 60% of the tumor-bearing rats. In addition, localized in situ PAs had developed in 5 of the 40 test rats. At 14 months 50 untreated L-W rats were free of demonstrable PAs. Two of 20 (10%) L-W rats developed PA at 14 months after inoculation of MNU alone. Six of 42 (14%) L-W rats developed PAs within 14 months after s.c. administration of testosterone implants. Thus, testosterone acted as a tumor promoter of PA for cells that had been initiated by MNU. The manifestations of the PAs in the L-W rats resembled many aspects of the counterpart disease in man.
Technology Transfer: What to Transfer?

Abstract In this paper, proper technology transfer is viewed as a transfer of not only production capabilities but also of methodologies and scientific understanding upon which such capabilities are based. The author discusses different forms, criteria for selection and evaluation systems, and bases for proper and sound decisions.