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(5,761 - 5,780 of 10,083)
Pages
- Title
- Comparative tests of small laminated and solid spruce beams for aeroplane construction
- Creator
- James, Sydney V
- Date
- 2009, 1911
- Publisher
- Armour Institute of Technology
- Description
-
http://www.archive.org/details/comparativetests00jame
Thesis (B.S.)--Armour Institute of Technology; Bibliography: leaf 19
- Title
- Comparative test of cylinder lubricating oils
- Creator
- Hoffman, C. B., Jr, Hooper, B. G.
- Date
- 2009, 1907
- Publisher
- Armour Institute of Technology
- Description
-
http://www.archive.org/details/comparativetesto00hoff
Thesis (B.S.)--Armour Institute of Technology
- Title
- Comparison of the various methods of determining the commercial efficiency of direct current motors & generators
- Creator
- Thatcher, W. C., Whitmore, R., Neville, W. J.
- Date
- 2009, 1910
- Publisher
- Armour Institute of Technology
- Description
-
http://www.archive.org/details/comparisonofvari00that
Thesis (B.S.)--Armour Institute of Technology; Bibliography : leaves: 105-107
- Title
- THE IMPACT OF WORK UNIT LEVEL PERCEPTIONS OF CAREER DEVELOPMENT OPPORTUNITIES, COWORKER SUPPORT, ROLE CLARITY, AND WORKLOAD ON EMPLOYEE ENGAGEMENT
- Creator
- Cama, Mike
- Date
- 2018, 2018-05
- Description
-
The Job Demands-Resources (JD-R) model has been used to explain influencing factors of engagement and burnout, with resources traditionally...
Show moreThe Job Demands-Resources (JD-R) model has been used to explain influencing factors of engagement and burnout, with resources traditionally having a relationship with engagement, and demands having a relationship with burnout. Recent research has suggested that demands may serve as moderators in the resources-engagement relationship based on whether the demands are perceived as challenges or hindrances. Additionally, most engagement research that focuses on antecedents of engagement is at the individual level yet that data is often aggregated at a higher level (e.g. business unit) when consequences of engagement (such as financial metrics) are considered. Furthermore, managers often receive aggregated scores for their work units and almost never receive individual level data to protect confidentiality and encourage honest responses. Therefore, this study seek to investigate how job resources (career development opportunities, role-clarity, and coworker support), aggregated at work unit level impact engagement and if the work unit level perception of workload moderates this relationship. Finally, it is expected that engagement will also have a strong positive relationship with intent to stay at the work unit level.
Ph.D. in Psychology, May 2018
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- Title
- GROUP-LEVEL META-ANALYSES: AN EXAMINATION OF THE EFFECTS OF CHARACTERISTICS OF GROUP-LEVEL STUDIES ON THE ACCURACY OF PARAMETER ESTIMATES
- Creator
- Burke, Maura Irene
- Date
- 2018, 2018-05
- Description
-
This dissertation was an empirical investigation of how statistical artifacts and characteristics of group-level studies affect meta-analytic...
Show moreThis dissertation was an empirical investigation of how statistical artifacts and characteristics of group-level studies affect meta-analytic parameter estimates in group-level meta-analyses. Simulation procedures were employed to examine how the proportion of available group-level reliability information, the number of studies in a meta-analysis, and the type of group-level reliability estimate affect the accuracy of estimates of the mean and variance of rho when these population values are known. Archival data was used to identify known population parameter values and create group-level meta-analytic conditions commonly seen in the organizational sciences literature. This study has resulted in the following conclusions. When proportions of sample-based reliability are reduced in availability, meta-analyses are relatively accurate in estimating the magnitude of mean rho. As more studies enter meta-analyses, standard errors of mean rho are substantially reduced and confidence bands become increasingly smaller in width and this pattern of results holds regardless of the group-level reliability estimate used to individually correct correlations. Further, when meta-analyses involved the use of completely assumed values, the degree of accuracy in mirroring known population parameters was dependent on the degree to which the group-level reliability value approximates that of the population. Finally, both ICC(2) values and rCG group-based reliability estimates produced relatively accurate meta-analytic findings relative to their respective known population parameter values. Advantages and limitations to the use of each type of reliability estimate are discussed in detail in the manuscript.
Ph.D. in Psychology, May 2018
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- Title
- INDIVIDUAL-BASED RISK MODELS FOR CRIME PREVENTION AND MEDICAL PROGNOSIS
- Creator
- Haro Alonso, David
- Date
- 2018, 2018-05
- Description
-
Parallel trends are currently taking place in the fields of crime and medicine, in which the focus is shifting from a reactive stance to a...
Show moreParallel trends are currently taking place in the fields of crime and medicine, in which the focus is shifting from a reactive stance to a proactive one. Both fields have traditionally been reactive, with police responding to 911 calls after a crime has occurred, and patients seeking medical care after symptoms have already appeared. In the field of crime, social-services programs, law-enforcement agencies, sociologists, and criminologists are studying ways to prevent crime, instead of merely reacting to it. A similar trend, known as preventive medicine, is concerned with addressing the causes of disease and not just focusing on treatment of disease that has already emerged. If crime and disease are to be prevented, it is important to understand the early warning signs of risk, to anticipate and treat problems before they occur. This can be accomplished via mathematical risk models that can evaluate an individual’s risk based on leading indicators. In this thesis I develop such models for two real-world problems in crime prevention and one in preventive medicine. A major focus of this thesis is to emphasize the accuracy of the ranking of risk for situations in which the allocation of resources must be prioritized to the highest-risk individuals. This is especially true in a social-services program designed to reduce crime, where the number of available social workers may be limited. In the first part of the thesis, I describe a novel method of risk modeling based on the probabilistic framework of a conditional random field, in which a machine-learning regressor is embedded. This is applicable in situations where an individual’s risk of an adverse outcome is partly dependent on the risk levels of others. We have applied this technique to develop a model that assesses an individual’s near-term risk of becoming a victim or arrestee in a shooting or homicide in Chicago. The model was developed as an informational tool for a pilot crime-prevention program that aims to offer social services to at-risk persons with the aim of providing opportunities for life changes that may reduce their crime risk. In the second part of the thesis, I describe a new model with a similar goal—to identify individuals at risk of involvement in crime—but aims to provide information for use in smaller cities that have a more typical array of crime concerns than Chicago. We developed the model as part of a current partnership with the Elgin Police Department, where a social-services intervention program under development will incorporate our model in identifying persons who might benefit from assistance. In the last part of the thesis, I describe a risk assessment algorithm for the medical field, which we developed in partnership with Cedars-Sinai Medical Center, Los Angeles, CA. In this work, we sought to demonstrate to the cardiology field (and the broader medical field) that machine learning can provide a better framework for risk stratification in medicine than traditional statistical methods such as logistic regression, which are the norm in that field. We also showed that, contrary to concerns by medical practitioners, machine learning can provide a solution that is easy to interpret.
Ph.D. in Electrical Engineering, May 2018
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- Title
- COMPUTATIONAL STUDIES OF HEAT TRANSFER IN TURBULENT WAVY CHANNEL FLOWS
- Creator
- Dzubur, Amar
- Date
- 2018, 2018-05
- Description
-
Heat transfer is studied in fully-developed turbulent flows through channels with various geometries using Direct Numerical Simulations (DNS)....
Show moreHeat transfer is studied in fully-developed turbulent flows through channels with various geometries using Direct Numerical Simulations (DNS). Channels where a sinusoidal wave is mapped along the wall in either the streamwise direction or spanwise direction are studied, and comparisons to a simple channel with flat walls (rectangular channel) are provided. The fluid flow velocities fi elds, and pressure fi elds are analyzed along with the vorticity generated in the flow, and are utilized in tandem with the Nusselt number calculated along the heat transfer boundaries, to derive a clearer description of the heat transfer performance of the various geometries. The geometries that have a sinusoidal wave mapped along the spanwise direction and not along the streamwise direction showed the poorest heat transfer performance, as exhibited by the lowest average Nusselt number. The performance of two channels, with an in-phase and out of phase sinusoidal wave mapped along the streamwise direction exhibited heat transfer performance signifi cantly higher than that shown by the rectangular channel, which served as baseline. The heat transfer differences can be largely attributed to the vorticity generation and superior fluid mixing that is generated by the periodic streamwise mapped sinusoid. Streamwise sinusoidal channels exhibit Nusselt numbers that are more than three times greater than the spanwise mapped sinusoid, and almost three times greater than that of the rectangular channel. It is shown that the difference among an in-phase and out of phase wave mapping exists, but is found to be minimal. Further exploration regarding potential geometries with various phase shifts, non-rounded corners, and longer simulation times would be beneficial.
M.S. in Mechanical and Aerospace Engineering, May 2018
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- Title
- UNEMPLOYMENT AND SUICIDE IN THE FRAMEWORK OF THE INTERPERSONAL THEORY OF SUICIDE
- Creator
- Roubal, Eren A.
- Date
- 2018, 2018-05
- Description
-
Becoming unemployed is typically considered a risk factor for suicidal ideation (SI) and behavior. This study aimed to examine how...
Show moreBecoming unemployed is typically considered a risk factor for suicidal ideation (SI) and behavior. This study aimed to examine how unemployment confers risk for suicidal ideation, positing that Perceived Burdensomeness (PB) and Thwarted Belongingness (TB) function as mediators between the length of an individual’s unemployment and their level of SI. In terms of the Interpersonal Theory of Suicide, individuals with higher levels of these variables are hypothesized to have an increased desire to be dead. Other issues related to unemployment and suicidal thinking were examined including whether the preceding variables had a curvilinear relationship to length of unemployment, whether income loss was a predictor of suicidal thinking and whether veterans of the armed forces experienced higher levels of the preceding variables than non-veterans. PB was found to function as a mediator, but TB did not. There was evidence of a curvilinear relationship, with individuals recently and long-term unemployed reporting lower SI than those unemployed for a moderate duration. Income loss was unrelated to both PB and SI, and veterans were found to exhibit higher PB and SI than non-veterans, but similar levels of PB. These findings begin to shed light on which individuals who lose their job are at greater risk for suicidal thinking; clinical implications for risk assessment are also discussed.
Ph.D. in Psychology, May 2018
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- Title
- A MICROSCOPICALLY INTACT GASTROINTESTINAL ANASTOMOSIS: METHODS OF CONSTRUCTION AND MEANS OF ASSESSMENT
- Creator
- Hedberg, H. Mason
- Date
- 2018, 2018-05
- Description
-
Recent research reveals that healing of anastamotic wounds can be impaired by the adherence of gut bacteria to exposed collagen. Sutures and...
Show moreRecent research reveals that healing of anastamotic wounds can be impaired by the adherence of gut bacteria to exposed collagen. Sutures and staples create a network of microscopic channels along the inverted cut bowel edge which may promote bacteria-mediated anastomotic breakdown. Techniques that preserve microscopic tissue integrity may be key to preventing clinical anastomotic leaks. Our objective was to develop a sensitive assay to determine anastomotic integrity across various techniques including single-layer hand-sewn, stapled, adhesive and bipolar. All anastomoses were performed in an end-to- end fashion between segments of porcine small intestine; intact bowel served as a control. Prototypes were designed to facilitate technically consistent bipolar and adhesive anastomoses between everted bowel ends. The anastomotic lumen was placed in series with a low-flow, low-pressure circuit of concentrated fluorescein solution. Normal saline filled a chamber surrounding the anastomosis; extraluminal solution was periodically sampled for analysis. Fluorescein concentration was quantified with spectrophotometry. Intact controls and adhesive anastomoses showed minimal increase in fluorescein concentration. Over fifteen minutes the adhesive anastomoses leaked less than bipolar (p=0.05), stapled (p<0.01), and hand-sewn (p=0.12) anastamoses. Sewn anastomoses had the highest leak variance, accounting for the lack of significance. Adhesive anastomoses improved microscopic integrity to fluorescein compared to all other techniques. The immediate next phase will include revising bipolar and adhesive prototypes, improving statistical power, and using a bacterial culture in lieu of fluorescein. Focusing on techniques that produce the most biologically intact anastomoses has the potential to prevent clinical anastomotic leaks.
M.S. in Biomedical Engineering, May 2018
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- Title
- CoA Presentation on IR
- Date
- 11/3/2010
- Description
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A presentation created to market IR and DSpace to the College of Architecture
- Title
- Voices of the Holocaust: A Collection of Interviews with Displaced Persons Recorded by Dr. David Boder in the Aftermath of World War II
- Date
- 2009
- Description
-
A presentation to AJC regarding the Voices of the Holocaust project.
- Title
- Facilities Building, Illinois Institute of Technology
- Date
- 2015
- Description
-
3100 South Federal Street, Chicago, Illinois
- Collection
- Building History project (buildinghistory.iit.edu)
- Title
- Technology Park Central, Illinois Institute of Technology
- Date
- 2015
- Description
-
3424 South State Street, Chicago, Illinois
- Collection
- Building History project (buildinghistory.iit.edu)
- Title
- Technology Business Center, Illinois Institute of Technology
- Date
- 2015
- Description
-
3440 South Dearborn Street, Chicago, Illinois
- Collection
- Building History project (buildinghistory.iit.edu)
- Title
- Technology Park North, Illinois Institute of Technology
- Date
- 2015
- Description
-
3410 South State Street, Chicago, Illinois
- Collection
- Building History project (buildinghistory.iit.edu)
- Title
- TARGETED AND SUSTAINED DELIVERY OF POLYPHOSPHATE FOR SUPPRESSION OF BACTERIAL COLLAGENASE AND POST-SURGICAL INTESTINAL HEALING
- Creator
- Nichols, Dylan
- Date
- 2018, 2018-05
- Description
-
Nanoparticle drug delivery holds great promise in the field of nanomedicine. Nanoparticles, containing encapsulated drugs, provide a variety...
Show moreNanoparticle drug delivery holds great promise in the field of nanomedicine. Nanoparticles, containing encapsulated drugs, provide a variety of advantages for administration of therapeutic factors including controlled and sustained drug release and site-specific targeting thereby improving therapeutic efficacy. At the forefront of modern medicine is the onset of understanding how an individual’s microbiome may impact their health and how to avoid upsetting this sometimes delicate but often essential ecosystem. The human gastrointestinal tract is subject to a variety of physiological perturbations as a result of disease or surgical interventions that lead to major disturbances in gut microbial ecology. Furthermore, administration of antibiotics to address these issues have been shown to exacerbate the intestinal dysbiosis and create local cues that shift the composition and function of the normal microbiota to a state in which certain strains become dominant and pathogenic. Furthermore, antibiotic administration to treat intestinal infections during surgery or disease invariably kill off the normal flora and contribute to the proliferation and antibiotic resistance of virulent pathogenic strains. Thus, approaches focused on targeted delivery of therapeutic compounds to the intestinal epithelium that suppress pathogenic expression (i.e. virulence and tissue degrading activity) while allowing commensal bacteria to proliferate normally would be highly advantageous. Previous studies in the Alverdy laboratory at the University of Chicago have demonstrated that phosphate becomes depleted in the intestinal tract following surgical injury and is a major “cue” that triggers bacterial virulence. Furthermore, phosphate or polyphosphate supplementation has been shown to prevent in vitro bacterial transition to virulence and to prevent impaired intestinal healing (anastomotic leak) with oral polyphosphate administration in mouse models of surgical anastomosis with intestinal inoculation. In this thesis we propose the use of polyphosphate loaded nanoparticles (NP-PPi) as a drug delivery approach to attenuate the expression of pathogens identified to produce elevated levels of the tissue destroying enzyme collagenase, resulting in intestinal healing impairment. A previously developed inverse miniemulsion polymerization process used for the creation of phosphate loaded poly(ethylene) glycol nanoparticles is adapted for post-loading of polyphosphate into the particles. This results in the formation of polyphosphate loaded nanoparticles (NP-PPi) with high polyphosphate concentration and in its sustained release. In vitro studies demonstrated that NP-PPi were effective at attenuating collagenase production and biofilm formation, two key markers of bacterial virulence, for clinically relevant gram-negative pathogens. Ex vivo and in vivo studies demonstrate that NP-PPi remain mucoadhesive onto intestinal explants and to the intestinal epithelium when delivered in combination with an adhesive polyethylene glycol block copolymer, PEG 15-20. Furthermore, ex vivo studies indicate that NP-PPi are effective at suppressing bacteria colonization, suggesting their potential for attenuating tissue invasion of host pathogens in vivo.
M.S. in Biomedical Engineering, May 2018
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- Title
- PERFORMANCE APPRAISAL RATING GOALS: A MULTILEVEL POLICY-CAPTURING STUDY EXAMINING RATEE, RATER, AND SITUATIONAL INFLUENCES ON GOAL APPLICATION
- Creator
- Overfors, Christine M.
- Date
- 2018, 2018-05
- Description
-
Performance ratings are a critical behavior of study in industrial and organizational psychology. For decades, researchers have sought to...
Show morePerformance ratings are a critical behavior of study in industrial and organizational psychology. For decades, researchers have sought to better understand the process managers follow to assign performance ratings. Rating goals have been proposed as the primary mechanism that managers use to determine which performance rating they will assign (e.g. Murphy & Cleveland, 1995; Murphy, 2008). This study investigated the rating goals pursued by sales managers evaluating vignettes of insurance agents using a policy-capturing approach. Rater characteristics, ratee characteristics, and a situational variable were examined to determine the influence of these factors on rating goals. Hypotheses and research questions were analyzed using hierarchical linear modeling, a statistical methodology which accounts for the inherent nesting within rating goals data. Results suggest that significant variability exists within raters and across raters in their endorsement of rating goals and that raters differ in the way they consider performance information in rating goal endorsement. In addition, some characteristics of the rater may influence the rating goals a rater chooses to endorse. Results and implications for future research are discussed.
Ph.D. in Psychology, May 2018
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- Title
- FROM EVERYTHING CALLED CHICAGO SCHOOL TO THE THEORY OF VARIETIES
- Creator
- Baciu, Dan C.
- Date
- 2018, 2018-05
- Description
-
A.D.F. Hamlin’s Chicago School was rooted in the untrammeled freedom of art in America and offered bold, utilitarian solutions for early...
Show moreA.D.F. Hamlin’s Chicago School was rooted in the untrammeled freedom of art in America and offered bold, utilitarian solutions for early skyscrapers with vertical lines rising uninterrupted from the basement to the roof. Thomas Tallmadge responded to Hamlin, but redefined the term, inspired by the great American planes and their horizontal lines. Sigfried Giedion returned to the initial definition and was followed as well as opposed by many later writers. Meanwhile, William James witnessed the birth of a Chicago School of Thought around John Dewey’s pragmatist philosophy. Robert Park became the central figure in a Chicago School of Sociology that explored human nature. And in economics, Milton Friedman crusaded for free markets and free choice. Furthermore, there were Chicago Schools of Fiction, Broadcasting, Advertising, and many more. This present dissertation collected, cataloged, and evaluated everything called Chicago School. Based on this data, it is possible to tell from a collective point of view what successful Chicago Schools were. In addition, Sigfried Giedion’s school marks a turning point in history. After Giedion’s essay was published, multiple schools of thought rose to fame together. Why did this trend only come into action a century after the first mentions of a Chicago School? To understand this delay, I developed a theory based on the variability of definitions and the responsiveness of audiences. Mathematically, the Theory of Varieties builds on equations previously employed in other disciplines. In the Humanities, it may help evaluate the evolution of cultural trends.
Ph.D. in Architecture, May 2018
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- Title
- ASSESSING THE BIOLOGICAL REACTION TO IMPLANTATION OF PERIPHERAL NERVE ELECTRODE INTERFACE DEVICES
- Creator
- Bredeson, Samuel
- Date
- 2018, 2018-05
- Description
-
It has long been suspected that tethering forces between a peripheral nerve interface device and a connector mounted on the skin can cause...
Show moreIt has long been suspected that tethering forces between a peripheral nerve interface device and a connector mounted on the skin can cause wire breakage and device failure in a relatively short time. This has been confirmed by our own experimental observations. Devices and methods have been developed that eliminate the need for a wire tether by replacing it with a wireless power and data transmission system based on mutual induction. Wireless systems, however, require the use of electronic components placed directly on the nerve being interfaced, which could be an alternate source of trauma to the tissue. An additional difficulty with wireless devices is their placement within the body. Wireless power and data transfer often depend on the successful coupling of inductive coils in the transmitter and receiver. The strength of this coupling changes with the distance, alignment, and size difference between the two coils. This creates practical limits on where implanted devices can be placed within the body. Typically, implantable wireless devices utilizing mutual induction approach this problem by making their inductive coils larger. The relationship between on-nerve device size and damage to the interfaced tissue has not been thoroughly studied for implantable peripheral nerve interface devices. Two experimental phases were devised to investigate the biological impact in-vivo of wired versus wireless devices and increasing the size of wireless devices. First, a 14-month study was performed to assess the chronic usability of this type of interface. Next, a 10-week study was performed to closely investigate the tissue response to implanted devices. The conclusion of this work is that for wireless modules integrated with peripheral nerve cu s, there is not a correlation between electronics package size and overall nerve health as based upon histological and functional assays. This suggests that use of untethered wireless, rather than tethered wired, interfaces may be better for the health of the nerve interface even when utilizing a broad range of wireless electronic package sizes.
Ph.D. in Biomedical Engineering, May 2018
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- Title
- Bulge Lab - Clickable Walkthrough
- Creator
- Deanda, Michael
- Date
- 2018-07-25, 2018-09-25
- Description
-
Bulge Lab is an Alternate Reality Game (ARG) about masculinity, body image, and viruses. Michael DeAnda developed this ARG using a series of...
Show moreBulge Lab is an Alternate Reality Game (ARG) about masculinity, body image, and viruses. Michael DeAnda developed this ARG using a series of social media sites and blogs to post content and an email address that autoresponds to players using a series of filters and canned responses. The game begins on Bulge Lab, a fictitious underwear store developing products to make gay men more attractive by standards of hegemonic masculinity. This site serves as the rabbit hole for the ARG. Upon subscribing to the company’s newsletter, the player is told that one of the company’s prospective models has gone missing. By following a link to his blog, the player begins investigating what happened to him and serves as a detective for Bulge Lab. The contained file is a clickable walkthrough.
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