112 research outputs found
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To Dr. Mitchel.
No full textThe letter written to certain Dr. Mitchel follows on a report which the author composed at the request of Governor Clinton and also dated August 17, 1751. As Cadwallader finds that the report was too long to include specific examples of frauds committed against the Indians, he provides for examples and requests that Dr. Mitchel convey to the authorities
Impact of NIOSH education and research centers of workplace practice
No full textMultiple federal efforts to improve occupational safety and health (OSH) in the United States were implemented over the course of the twentieth century. The development of the Occupational Safety and Health Administration (OSHA) to implement safety and health standards was an initial step to improve workplace safety and health nationwide. An additional effort was the creation of the National Institute for Occupational Safety and Health (NIOSH). That agency, in turn, created Education and Research Centers (ERCs) to provide continuing education and graduate level training in occupational medicine, occupational health nursing, occupational safety, and industrial hygiene. Many training programs were created by both the ERCs and other agencies, causing the Institute of Medicine (IOM) in 2000 to call for an evaluation of all worker training programs to determine whether they are effective. Such an evaluation is important because despite the figures showing that workplace deaths and injuries have decreased, we really do not know whether it is the training programs or other factors that have the desired effect of improving worker safety. This thesis addressed that issue. Using a multimodal effort for obtaining data, the research evaluated how the ERCs have impacted the workforce. The research utilized qualitative methods, including key informant interviews, to indicate the impact the ERCs have had on workplace safety and health. Additionally, the research conducted a quantitative survey of former ERC students to identify how effective the ERC training programs were in providing information so they can make appropriate health and safety decisions in their workplace practices. This research shows that the ERCs provided training that has made a positive impact on worker health and safety. Key informants identified safety and health training as effective in producing changes in the workplace. Furthermore, the surveys identified trainees as having increased their knowledge and learned new skills. Trainees identified changes needed in their workplace, and the training has provided them with some of the knowledge and skills to make those changes.Ph. D.Includes bibliographical referencesIncludes vitaby Mitchel A. Rose
Hydrodynamics and Morphologic Modelling of Alternative Design Scenarios Using CMS: Shippagan Gully, New Brunswick
No full textShippagan Gully is a highly dynamic tidal inlet located on the Gulf of St-Lawrence near Le Goulet, New Brunswick. This tidal inlet is highly unusual due to the fact that the inlet has two open boundaries with phase lagged tidal cycles that drives flow through the inlet. Over the past few decades, the shipping activities through the inlet have been threatened due to the narrowing of the navigation channel caused by deposited sediment on the east side of the channel. Many engineering projects have been undertaken at Shippagan Gully in order to try and mitigate the deposition problem. However, these attempts have either been unsuccessful or the engineered structures have deteriorated over the years. This study uses the CMS-Flow and CMS-Wave numerical models to provide guidance concerning the response of the inlet to various potential interventions aimed at improving navigation safety
Hydrodynamics and Morphologic Modelling of Alternative Design Scenarios Using CMS: Shippagan Gully, New Brunswick
No full textShippagan Gully is a highly dynamic tidal inlet located on the Gulf of St-Lawrence near Le Goulet, New Brunswick. This tidal inlet is highly unusual due to the fact that the inlet has two open boundaries with phase lagged tidal cycles that drives flow through the inlet. Over the past few decades, the shipping activities through the inlet have been threatened due to the narrowing of the navigation channel caused by deposited sediment on the east side of the channel. Many engineering projects have been undertaken at Shippagan Gully in order to try and mitigate the deposition problem. However, these attempts have either been unsuccessful or the engineered structures have deteriorated over the years. This study uses the CMS-Flow and CMS-Wave numerical models to provide guidance concerning the response of the inlet to various potential interventions aimed at improving navigation safety
'The Path I Must Travel'
No full textVincent Price reading the poem 'The Path I must Travel' by IAIA student Barney Mitchel
Sclerotherapy : treatment of varicose and telangiectatic leg veins /
No full textBoth in print and online, this classic resource by Drs. Mitchel P. Goldman, Robert A Weiss, and Jean-Jerome Guex provides highly practical, up-to-date guidance for the effective management of varicose veins and other vascular anomalies. It is an indispensable reference for a wide audience including dermatologists, invasive radiologists, family practitioners, vascular and cosmetic surgeons. Clearly written by global experts, Sclerotherapy, 6th Edition, helps those new to the field to gain a firm understanding of successful techniques, as well as showing seasoned practitioners how to improve and hone their skills with today's best and newest approaches. Case studies, detailed color illustrations, and procedural videos online offer step-by-step visual guidance.Print version record.Front Cover; Inside Front Cover; Sclerotherapy; Copyright Page; Table Of Contents; Video Contents; Preface; Additional Contributors; Introduction; Historical Aspects of Treatment; Reasons for Treatment; Present Day Treatment; References; 1 Anatomy; Introduction; Nomenclature; General Considerations; Deep Venous System; Anatomy of the Superficial Veins; Great Saphenous Vein; Small Saphenous Vein; Other Superficial Veins and Collateral Veins; Duplex Ultrasound Anatomy; Duplex Ultrasound Markers for Vein Identification; The 'Eye' Sign; The 'Alignment' Sign; The E Point Sign (Fig. 1.20).The Tibia-Gastrocnemius Angle SignThe Small Saphenous Compartment Sign; Relationship between Saphenous Veins and Collaterals; Great Saphenous Vein; Saphenofemoral Junction; Arrangement of the GSV and Its Subcutaneous Collaterals in the Thigh; Arrangement of the GSV and Its Subcutaneous Collaterals at the Knee; T Vein; The Anterior Accessory Saphenous Vein; Small Saphenous Vein; Saphenopopliteal Junction; Thigh Extension of the SSV; Arrangement of the SSV and Its Collaterals; Foot Veins; Perforating Veins; Venous Valvular System; Nerves of the Leg of Phlebologic Interest; Histology; Vein Walls.Venous ValvesVein Wall Variation; Venules; Telangiectasias; Innervation; References; 2 Adverse Sequelae and Complications of Venous Hypertension; Pathogenesis; Molecular Mechanisms; Inflammation and Skin Changes; Classification of Venous Disease; Incidence; Symptoms and Signs; Edema and Lipodermatosclerosis; Pigmentation; Venous (Stasis) Dermatitis; Atrophie Blanche; Ulceration; Malignant Degeneration; Secondary Complications of Venous Hypertension-Stasis; Hemorrhage; Superficial Thrombophlebitis; Deep Venous Thrombosis; Classification; References; 3 Pathophysiology of Varicose Veins.Histochemical Physiology of Varicose VeinsPathophysiology; Increased Deep Venous Pressure; Proximal Origin; Pelvic Obstruction; Increased Intra-Abdominal Pressure; Saphenofemoral Incompetence; Distal Origin; Valvular Incompetence; Venous Obstruction; Arteriovenous Anastomosis; Primary Valvular Incompetence; Secondary Valvular Incompetence; Effects of Pregnancy; Menstrual Cycle Effects; Constitutive Elements and Progression of Varicose Veins; Heredity; Aging; References; 4 Pathophysiology of Telangiectasias; Classification; Patterns; Pathogenesis; Incidence; Pathophysiology.Genetic/Congenital FactorsNevus Flammeus; Klippel-Tréaunay Syndrome; Nevus Araneus; Angioma Serpiginosum; Bockenheimer Syndrome (Diffuse Genuine Phlebectasia); Maffucci Syndrome; Congenital Poikiloderma; Essential Progressive Telangiectasia; Cutis Marmorata Telangiectatica Congenita; Diffuse Neonatal Hemangiomatosis; Acquired Disease with a Secondary Cutaneous Component; Component of a Primary Cutaneous Disease; Varicose Veins; Keratosis Lichenoides Chronica; Other Acquired Primary Cutaneous Diseases; Hormonal Factors; Pregnancy and Estrogen Therapy; Malignancy.Both in print and online, this classic resource by Drs. Mitchel P. Goldman, Robert A Weiss, and Jean-Jerome Guex provides highly practical, up-to-date guidance for the effective management of varicose veins and other vascular anomalies. It is an indispensable reference for a wide audience including dermatologists, invasive radiologists, family practitioners, vascular and cosmetic surgeons. Clearly written by global experts, Sclerotherapy, 6th Edition, helps those new to the field to gain a firm understanding of successful techniques, as well as showing seasoned practitioners how to improve and hone their skills with today's best and newest approaches. Case studies, detailed color illustrations, and procedural videos online offer step-by-step visual guidance.Elsevie
Turbine array interactions and performance in TELEMAC-3D
No full textRiver hydrokinetic energy (RHE) turbines for electric power generation are generally deployed in an array or farm configuration to benefit from economies of scale. To support resource assessments and decision making, RHE developers need to be able to quantify the total power that can be generated within a river reach using an array (or arrays) of RHE turbines. The total extractable power for a given site depends on (i) the drag and power characteristics of individual turbine devices, (ii) turbine wake hydrodynamics and wake interactions within arrays, and (iii) macro scale river hydrodynamics, which may be altered by the presence of turbine arrays. Quantifying total extractable power therefore requires the ability to simulate hydrodynamics at both river reach (macro) and turbine/array (micro) scales simultaneously. In this paper, we present modifications of the TELEMAC-3D source code, implemented as a first step in facilitating estimation of the total extractable power for arrays of RHE turbines. The methodology is based on the assumption that the locations, geometry and performance characteristics of individual turbines are known a priori (e.g. from CFD simulations or physical model tests). Preliminary work to validate the methodology, by comparing the results of numerical flume tests for cylinders and simplified turbines with numerical and physical modelling data, is presented. Limitations, and future research needs to enable a unified approach to RHE resource assessment, are identified.Peer reviewed: YesNRC publication: Ye
Urban quay walls: A numerical study to recognize foundation defects via masonry damage patterns
No full textThe city of Amsterdam has a large number of old quay walls with rotten foundation piles. These foundation piles need to be identified and measures need to be taken. The urban quay walls are supported by two types of foundation: pinewood piles, which are easily affected by bacterial decay and spruce piles. To understand the mechanical behaviour of quay walls better, it is needed to know the type of wood used for each pile foundation along the 200 km of quay walls currently showing signs of damage. For that reason, specialized diving teams are hired to identify the rotten piles and foundation defects, to know which foundation piles need replacement. Since the area is very large and diving inspections are costly and lengthy in time, there is a need to correlate the foundation defect to the masonry damage above the water level. The masonry above the water level could give lots of information about the condition of the foundation, due to cracks or deformations in the masonry. This research could help to relate foundation defects with damage patterns in the masonry. Understanding this relation helps to identify foundation defects at an earlier stage and helps the municipality to prioritize the replacement of foundation piles. The thesis aims to find indicators above the water line to identify foundation problems by studying the crack patterns in a typical unreinforced masonry quay in Amsterdam. From the point of view of the masonry structures, failure of foundation piles results in a settlement deformation causing cracking. This research will support the current work by Sweco in helping to find foundation defects from above the waterline via masonry damage patterns in quay walls. This will be achieved by performing a parametric study, bases on 2D nonlinear finite element analyses, varying the extent of the pile defects, the material properties of the masonry and lateral boundary conditions for a selected representative base case. To simulate the damage in masonry, a smeared crack approach was used. The foundation defects were simulated by applying a settlement deformation to the quay wall. A Gaussian settlement deformation profile was imposed and the ratio between the length of the profile and the length of the quay wall was varied to simulate the failure of single or multiple piles. To capture the influence of the material properties of masonry (especially related to tension failure), three types of masonry were defined: weak, average and strong. The influence of the boundary conditions at the edges was checked by performing analyses with horizontally free lateral sides and with horizontally fixed lateral side. This is done to simulate the effect of arching in the structure. Eventually, the influence of the location of the foundation defect was analyzed by comparing a symmetric Gaussian settlement deformation with an asymmetric settlement. The analyses show correlations between the vertical displacement at the top of the structure and the length of the settlement profile. As expected, this can be interpreted with the fact that if several piles are damaged simultaneously, a larger portion of the quay wall is cracking. The material properties of the masonry influence the development of crack patterns. The stronger is the masonry, meaning increasing the values of Young’s modulus, tensile strength and fracture energy, the larger is the settlement displacement needed to obtain the same crack pattern. The lateral constraints contribute mostly to the development of the horizontal crack since no horizontal cracks appeared in situations without these constraints. Since the influence of additional loads is not considered in the analysis and the model is modelled in 2D it is recommended to analyze the influence of both in further studies. It is also recommended to validate the model against field measurements since no verification has been done.Civil Engineering | Structural Engineering | Hydraulic Structure
Collaboration on Safety of Dutch Chemical clusters
No full textThis project aims to answer the question of how cross-plant safety can be improved in a general way, including the prevention of domino effects. The main research question is: How do we improve collaboration between companies in a chemical cluster, in so that an overall safety gain is achieved? From the literature review and the interviews a list of the main drivers and impediments have been created. There are 10 drivers that drive cross-company collaboration on safety: (1) Economic benefits, (2) Reduction of safety and security risk, (3) Support of decision-making on the prevention of domino effects, (4) Improvement of efficiency in safety training, (5) Improvement of efficiencyof safety management, (6) Improvement of safety inspection and maintenance of infrastructure, facilities and services that are related to domino effect prevention, and a few more that are removed due to confidential matters. Additionally ten impediments have been found that hamper collaboration on cluster safety: (1) Communication and information sharing impediment, (2) Knowledge gaps, (3) Mistrust among companies, (4) Collaboration costs, (5) Difference in interest, (6) Insufficient policy and legislation support, (7) Cluster risk identification and recognition gaps, (8) Confidential issues and restrictions from mother company, and a few more that are removed due to confidential matters.The conventional QRA framework is not build for cluster-wide safety and could be improved. The improved QRA includes a loop for additional analysis of installations that are affected by escalations of other installations. Further research could be done in analysing the link between types of collaborations (sharing information, learning from each other, sharing facilities & equipment, etc.) and the drivers and impediments.This thesis is a version where specific interview data is removed. For a full version you can contact the author.Management of Technology (MoT
Video-Based Two-Dimensional Kinematic Analysis for the Evaluation of Lower Limb Function in Patellar Tendinopathy
No full textPatellar tendinopathy (PT) is a common manifestation in jumping sports characterized by pain and a reduced load bearing capacity. The exact cause of PT has not been determined, which makes it difficult to prevent and treat. A stiffer landing technique might be a risk-factor for PT. Retraining of the landing technique into a less stiffer technique could be an important treatment for PT. Therefore, the aim of this study was to determine whether athletes with PT exhibit altered lower limb kinematics in the landing technique of a drop vertical jump test (DVJT) compared to asymptomatic athletes. DVJTs were performed by athletes diagnosed with PT and asymptomatic athletes. The DVJTs were recorded on video in the sagittal plane with a single camera in the Erasmus MC University Medical Center (Rotterdam, the Netherlands). A convolutional neural network was trained to extract coordinates of lower limb landmarks from the videos. The knee and ankle joint angles were calculated on the coordinates using least-squares. Functional Principal Component Analyses (FPCA) were performed to determine differences in lower limb kinematics between athletes with PT and asymptomatic athletes. In addition, the following kinematic features were compared between athletes with PT and asymptomatic athletes: angle at landing, maximal angle during landing, range of motion and time to maximal angle. Video-based 2D kinematic analysis of the landing DVJT was performed in 69 athletes with PT (53 men, mean age 24.6 ± 3.8 years) and 32 asymptomatic athletes (16 men, median age 20.5 (4) years). FPCA of knee (FPC1: p=0.5, FPC2: p=0.3) and ankle (FPC1: 0.7, FPC2: 0.1, FPC3: 0.5) joint angles did not show significant differences in the landing technique between these two groups. No significant differences were observed in angle at landing, maximal angle during landing, range of motion and time to maximal angle (knee: p=0.3, p=0.8, p=0.7, p=0.4; ankle: p=0.5, p=0.6, p=0.4, p=0.1). Athletes with PT do not have altered lower limb kinematics during the landing phase of a DVJT compared to asymptomatic athletes. These findings implicate that landing technique is not an important factor to address during rehabilitation of patients with PT. Technical Medicine | Sensing and Stimulatio
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