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Search Results: 1 - 10 of 2886 matches for " Jessica Vollertsen "
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Building up Systematic Client-Centred Data as a Base for Clinical Outcome within Outpatient Neurorehabilitation  [PDF]
Jessica Vollertsen, Kersti Samuelsson
Open Journal of Therapy and Rehabilitation (OJTR) , 2016, DOI: 10.4236/ojtr.2016.41002
Abstract: Objective: This study describes the development and use of a specific database supporting personnel within outpatient neurological rehabilitation to reflect on existing interventions and improve future rehabilitation. Methods: Five outpatient rehabilitation centres in one county council in Sweden were involved in developing and implementing a systematic data collection template within the existing digital medical record system. Data were collected to get more information on the effects of outpatient stroke rehabilitation in patients who received rehabilitation the first year after a stroke (ICD-I64) and patients who received further rehabilitation 1 year or more after a stroke (ICD-I69). Data analysis included evaluation of balance, movement, activity/participation, health-related quality of life, and self-rated health. Results: The ICD-I64 group had positive results after treatment (p < 0.05) for all variables and the ICD-I69 group had positive results for balance and activity/participation. Conclusions: The use of systematic data collection provided a platform for employees and managers to discuss and use clinical results to improve the type and quality of rehabilitation interventions.
Thermal Analysis of Laser Chemical Machining: Part I: Static Irradiation  [PDF]
Hamza Messaoudi, Sandro Eckert, Frank Vollertsen
Materials Sciences and Applications (MSA) , 2017, DOI: 10.4236/msa.2017.810049
Abstract: The laser chemical machining is a non-conventional substractive processing method. It is based on the laser-activation of a material dissolution of metals in electrolyte ambient via local-induced temperature gradients and allows a gentle and smooth processing of especially temperature-sensitive metals. However, the material removal is characterized by a narrow process window and is restricted by occurring disturbances, which are supposed to be related to the localized electrolyte boiling. In order to control the removal quality and avoid disturbances, the correlation between the laser-induced temperatures and the resulting removal geometry has to be better understood. In this work an analytical modeling of the laser-induced temperatures at the surface of titanium based on a Green-function approach is presented. The main influencing factors (laser, electrolyte, material) as well as possible heat transfer into the electrolyte are included and discussed. To verify the calculated temperatures, single spot experiments are performed and characterized for titanium in phosphoric acid solution within laser irradiation of 1 s. The correlation between the temperature distribution and the resulting removal geometry is investigated based on a spatial superposition. Thereby, the bottom limit temperature is found to range between 63°C and 70°C whereas the upper limit is related to the nucleate boiling regime. Based on the performed correlation an indicator is identified to predict the ruling removal regime and thereby to reduce the experimental expenditure.
Space Technology for Decarbonising City Precincts  [PDF]
Jessica Bunning
Journal of Geographic Information System (JGIS) , 2013, DOI: 10.4236/jgis.2013.55042
Abstract: Space technology is a powerful tool for climate research. Satellite data improve knowledge of the human impact on the Planet’s physical geography. Similarly, remote sensing technology enhances understanding of the human impact on rising global carbon emissions. However, so far satellites have been principally limited to measuring the carbon emissions of cities from space. Standing alone, satellite technology is incapable of advancing the goal of decarbonisation. This will be achieved only if cities create local methodologies that significantly enhance the carbon reduction process. There exists enormous potential to bridge remote sensing for earth observation and global environmental change with local action towards decarbonised urban renewal and redevelopment. Satellite remote sensing has the ability to demonstrate if local remedial strategies are succeeding, and assist with planning, developing, and monitoring low and zero carbon infrastructure systems. Satellite-derived data can facilitate informed discussion and decision-making between community stakeholders to deliver low carbon outcomes at the precinct scale. Satellite-based systems can be integrated within the urban fabric to assist climate change mitigation. This paper is based on current work implemented jointly with municipalities to ascertain where within city precincts carbon emissions originate and how they can ultimately be reduced. It presents space technology as an instrumental tool for understanding the carbon impact of citiesin terms of the carbon intensive patterns and processes that shape human society, as well as having great potential for providing end-user products to communities to enhance the process of decarbonising city precincts.
An Experimental Study of Microbial Fuel Cells for Electricity Generating: Performance Characterization and Capacity Improvement  [PDF]
Jessica Li
Journal of Sustainable Bioenergy Systems (JSBS) , 2013, DOI: 10.4236/jsbs.2013.33024
Abstract:

This paper studies the electricity generating capacity of microbial fuel cells (MFCs). Unlike most of MFC research, which targets the long term goals of renewable energy production and wastewater treatment, this paper considers a niche application that may be used immediately in practice, namely powering sensors from soils or sediments. There are two major goals in this study. The first goal is to examine the performance characteristics of MFCs in this application. Specifically we investigate the relationship between the percentage of organic matter in a sample and the electrical capacity of MFCs fueled by that sample. We observe that higher percentage of organic matter in a sample results in higher electricity production of MFCs powered by that sample. We measure the thermal limits that dictate the temperature range in which MFCs can function, and confirm that the upper thermal limit is 40℃. The new observation is that the lower thermal limit is -5℃, which is lower than 0℃ reported in the literature. This difference is important for powering environmental sensors. We observe that the electricity production of MFCs decreases almost linearly over a period of 10 days. The second goal is to determine the conditions under which MFCs work most efficiently to generate electricity. We compare the capacity under a variety of conditions of sample types (benthic mud, top soil, and marsh samples), temperatures (0℃, 40℃, and room temperature), and sample sizes (measuring 3.5 cm × 3.5 cm × 4.6 cm, 10.2 cm × 10.2 cm × 13.4 cm, and 2.7 cm × 2.7 cm × 3.8 cm), and find that the electricity capacity is greatest at 0℃, powered by benthic mud sample with the largest chamber size. What seems surprising is that 0℃ outperforms both room temperature and benthic mud sample outperforms marsh sample, which appears to be richer in organic matter. In addition, we notice that although the largest chamber size produces the greatest capacity, it suffers

Control Schemes to Reduce Risk of Extinction in the Lotka-Volterra Predator-Prey Model  [PDF]
Jessica Li
Journal of Applied Mathematics and Physics (JAMP) , 2014, DOI: 10.4236/jamp.2014.27071
Abstract:

The Lotka-Volterra predator-prey model is widely used in many disciplines such as ecology and economics. The model consists of a pair of first-order nonlinear differential equations. In this paper, we first analyze the dynamics, equilibria and steady state oscillation contours of the differential equations and study in particular a well-known problem of a high risk that the prey and/or predator may end up with extinction. We then introduce exogenous control to reduce the risk of extinction. We propose two control schemes. The first scheme, referred as convergence guaranteed scheme, achieves very fine granular control of the prey and predator populations, in terms of the final state and convergence dynamics, at the cost of sophisticated implementation. The second scheme, referred as on-off scheme, is very easy to implement and drive the populations to steady state oscillation that is far from the risk of extinction. Finally we investigate the robustness of these two schemes against parameter mismatch and observe that the on-off scheme is much more robust. Hence, we conclude that while the convergence guaranteed scheme achieves theoretically optimal performance, the on-off scheme is more attractive for practical applications.

Predicting Use of Lights and Siren for Patient Illnesses  [PDF]
Jessica Mueller, Laura Stanley
Open Journal of Safety Science and Technology (OJSST) , 2013, DOI: 10.4236/ojsst.2013.33008
Abstract:

Lights and siren are frequently used by Emergency Medical Service (EMS) groups to reduce response times and increase a patient’s chance for survival. However, the use of lights and siren in EMS patient transport has been associated with occasional inappropriate use, higher crash rates involving the ambulance, and a potential “wake effect” increasing crash rates in ambient traffic. This study examines types of patient illnesses and their involvement with either emergency (lights and siren engaged) or non-emergency transport. Patient care records were analyzed from a five-year period from a private medical transportation company. A binary logistic regression model was built to predict the transportation mode (lights and siren or non-emergency-mode) most likely to accompany each unique primary patient illness. Patient illnesses were identified that showed a higher probability of transport using lights and siren. Fifteen illness descriptions were identified from the records as being more likely to result in emergency mode travel, including airway obstruction, altered level of consciousness, breathing problems, cardiac arrest, cardiac symptoms, chest pain, congestive heart failure/pulmonary embolism, heart/cardiac, obstetrics, respiratory arrest, respiratory distress, stroke/cerebrovascular accident, trauma, unconscious, and patients where data was not entered. The patient illnesses associated with lights and siren were not limited to cardiac conditions and symptoms, which suggest that response-time goals based solely on cardiac arrest patients may need to be expanded to include other illnesses such as respiratory conditions. Expanded studies could assess whether or not lights and sirens result in a clinically significant time savings across the spectrum of illnesses that are currently being transported using lights and siren. The list of illnesses identified here as more commonly utilizing lights and siren could be useful to untrained EMS or dispatch workers to assist in minimizing unnecessary emergency mode travel, thereby increasing safety for EMS workers, patients, and the general public.

Gender Inequality within the U.S. Land-Grant Agricultural Sciences Professoriate
Jessica Goldberger,Jessica Crowe
International Journal of Gender, Science and Technology , 2010,
Abstract: This paper focuses on gender inequality in the agricultural sciences in colleges of agriculture at U.S. land-grant universities. We ask two questions: (1) What degree of gender inequality exists in the agricultural sciences? (2) Can gender inequality be attributed to differences in human capital; professional networking; means of scientific production1; and/or, research productivity? Drawing on data from a 2005 nationwide survey of land-grant agricultural scientists, we find evidence of significant gender inequality despite few gender differences in scientists’ human capital, professional networking, means of scientific production, and research productivity. Our most robust findings relate to gender differences in scientists’ doctoral training, farming experience, and ties with private industry. Male agricultural scientists’ stronger linkages with land-grant universities, the farming world, and private industry may result in superior career outcomes (in terms of promotion and salary) compared to their female counterparts.
The Effects of n-3 Fatty Acids and Bexarotene on Breast Cancer Cell Progression  [PDF]
Jessica Trappmann, Susan N. Hawk
Journal of Cancer Therapy (JCT) , 2011, DOI: 10.4236/jct.2011.25096
Abstract: Breast cancer cell growth can be inhibited in vivo by retinoid X receptor (RXR) specific retinoids. In both animal and cell culture studies, omega-3 fatty acids share growth regulatory effects similar to those of RXR specific retinoids (rexinoids). One synthetic rexinoid, bexarotene (LCD 1069, Targretin), is used clinically to treat cancer patients. Of concern is that some patients are unable to tolerate high doses of such treatment drugs. We hypothesized that n-3 fatty acids and bexarotene may work synergistically to slow breast cancer cell growth. To test our hypothesis, we used MCF-7 human mammary carcinoma cells and an in vitro cell culture model. We investigated the relationship between the omega-3 fatty acids docosahexaenoic acid (DHA) and eicosapentaenoic acid (EPA) alone and in conjunction with bexarotene in slowing MCF-7 cell growth. Following a 72 hr incubation with the respective treatments, bexarotene enhanced cell growth (p < 0.05) while DHA showed a strong growth inhibitory effect which was not enhanced by the addition of bexarotene (p < 0.05). EPA alone was not effective in altering cell growth (p < 0.05). Interestingly, when combined with bexarotene, EPA was more effective at slowing cell growth than when cells received EPA alone. Thus, select omega-3 fatty acids alone are more effective than bexarotene in slowing MCF-7 cell progression. However, the use of the RXR-selective retinoids may enhance the growth regulatory mechanisms of the fatty acid EPA.
Breast Cancer Therapies Present and Future  [PDF]
Jessica Kalra, Lincoln A. Edwards
Journal of Cancer Therapy (JCT) , 2012, DOI: 10.4236/jct.2012.36149
Abstract: Significant advances in breast cancer treatment have been made where it is now possible to treat localized disease to a curable state. However, for approximately 30% of women with primary disease, metastatic breast cancer (MBC) or recurrent disease, treatment has remained challenging. Major obstacles in the effective treatment of breast cancer in these populations include: 1) the molecular heterogeneity of the disease; 2) treatment of MBC and more specifically brain metastasis; and 3) defining combination therapies that address the evolution of resistance with disease relapse. The acknowledgement of these difficulties has led to an effort to further understand the roadblocks to therapy with the anticipation that more appropriate treatments will result. Here we describe the current state of breast cancer treatment, and the potential for improved therapy.
Life Satisfaction between Chinese-Immigrant Adolescents and Their Counterparts in the United States and China  [PDF]
Jessica J. Lee, Carole Kimberlin
Open Journal of Social Sciences (JSS) , 2015, DOI: 10.4236/jss.2015.34014
Abstract: The objective of this study was to compare the life satisfaction (LS) of Chinese-immigrant children in the United States (US) with their counterparts in America and China by using the Students’ Life Satisfaction Scale (SLSS). The mean scores of SLSS were examined and compared among three groups. Multivariate linear regression analysis was conducted to identify the differences of LS among comparison groups after adjusting for other potential risk factors. Out of 161 children who completed the surveys, 47 (29%) were Chinese-immigrant children, 81 (50%) were native Chinese children, and 33 (20%) were non-immigrant US children. The results showed that Chinese- immigrant children had higher overall LS than native Chinese children (4.39 ± 0.83 vs 3.79 ± 0.81; p = 0.0001), but lower overall LS than non-immigrant children in the US (4.39 ± 0.83 vs 4.81 ± 0.69; p = 0.0207). Systematic investigation on larger populations will be necessary to identify the potential contributing factors.
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