Experimental Characterization of Li-ion Battery cells for Thermal Management in Heavy Duty Hybrid Applications

The performance and lifetime of lithium ion (Li-ion) batteries are highly dependent on the internal operating temperature which makes thermal characterization of battery cells necessary. Therefore, the main focus of this thesis work was to characterize pouch and prismatic Li-ion cells by designing and conducting experiments to measure thermal parameters. The specific heat capacity was quantified as well as the heat conductivity in three dimensions. In addition, the heat generation from the cells was measured for different load cycles. Subsequently, the determined thermal parameters were inputs in a simulation model to determine the internal peak temperature of the cell during different load cycles. The experiments were carried out by using a custom-designed isothermal heat conduction calorimeter (IHC). This calorimeter was modified for measurement of individual thermal parameters. The modified setup was verified using available sample materials and subsequently applied for measurements on the Li-ion cells. The heat generated within the cells was measured for constant current rates and a dynamic operation cycle. The through-plane thermal conductivity for the provided pouch cell was measured to be lower than the in-plane (0.7Wm−1 K−1 compared to 20-30Wm−1 K−1). In addition, the specific heat capacity was measured to be 1100 J kg−1 K−1 for a pouch cell and a prismatic cell. Lastly, the heat generated by the cells was measured between 10mW to 30W. To conclude, the heat generation and specific heat capacity was measured successfully for both the pouch and prismatic Li-ion cell. The methods for thermal conductivity in through-plane and in-plane were utilized for the pouch cell. However, the proposed methods for thermal conductivities were found to be inapplicable for prismatic cells due to the conduction through the aluminum casing. Nevertheless, this opens up opportunities within the thermal characterization of Li-ion batteries

Standing in children with bilateral spastic cerebral palsy : aspects of muscle strength, vision and motor function

The movement and posture disorder of cerebral palsy (CP) is presumed to mainly be a consequence of the motor disorder, but accompanying disturbances with sensations and perception have also been suggested to influence motor function. The aim was to investigate factors influencing standing posture in children with bilateral spastic CP (BSCP) with varying standing abilities. Three-dimensional motion analysis with surface electromyography was recorded to describe posture during three standing tasks: in a habitual standing position, while blindfolded, and during an attention-demanding task. Muscle strength in the lower limbs was measured with a hand-held dynamometer. Motor function was measured with the Gross Motor Function Measure. The children also underwent a neuro-ophthalmological examination. Almost half of the participants required hand-held support to stand. Investigation of standing posture verified a crouched body position during standing which was more obvious in the children who required hand-held support. Muscle strength measurements indicated that the children in both groups were equally strong in the lower limb muscles despite their variation in standing abilities. The children who stood with support were as capable to perform motor activities in lying, sitting and kneeling positions as the children who stood unsupported. Vision influenced posture differently depending on the children's standing ability. During the attention demanding task, the children who stood unsupported stood more still and with less lower limb muscle activity. While blindfolded, they adapted their posture to the environmental change by activating muscles around the ankle with no changes in overall body position. In contrast, the children who required hand-held support to stand used another strategy; the already flexed body position became even more flexed, and muscle activity increased in the knee extensors while blindfolded, despite the use of external support. Motor disorders could not explain the support for standing or the crouched body position during standing. The children were equally strong in the lower limb muscles and had reasonably similar abilities to perform motor activities in positions with no requirement of standing on the feet opposing gravity. The crouched body position and the reduced ability to maintain posture while blindfolded indicate proprioception deficits in the children who required support. The increased quadriceps muscle activity could be an indication of compensatory co-contraction caused by perceptual impairments. That motor function difficulty arises in a standing position opposing gravity indicates that standing difficulties may be attributable to sensory and/or perceptual disturbances

Muscle strength does not explain standing ability in children with bilateral spastic cerebral palsy: a cross sectional descriptive study

BACKGROUND: In bilateral cerebral palsy (CP) muscle strength is considered important for development of gross motor functions, but its influence on standing ability has not been explored. Our aims were to examine muscle strength with respect to the ability to stand with (SwS) or without (SwoS) hand support, asymmetrical weight bearing (WB), and whether the ability to produce strength was influenced by different seated conditions. METHODS: In this cross sectional descriptive study standing posture was recorded with 3D motion analysis, and muscle strength was measured with a hand-held dynamometer, in 25 children with bilateral CP, GMFCS levels II-III, SwS (n = 14, median age 11.4 years), or SwoS, (n = 11, median age 11.4 years). Strength measurements were taken in the hip flexors, knee extensors, dorsiflexors and plantarflexors, in two seated conditions; a chair with arm- and backrests, and a stool. RESULTS: Compared to SwoS, children SwS stood with a more flexed posture, but presented with equal strength in the hip flexors, dorsiflexors and plantarflexors, and with somewhat more strength in the knee extensors. Despite asymmetric WB during standing, both limbs were equally strong in the two groups. No differences in strength were measured between the two seated conditions. CONCLUSIONS: Despite challenges measuring muscle strength in CP, the lower limb muscle strength cannot be considered an explanatory factor for variations in standing in this group of children with bilateral CP. The findings rather strengthen our hypothesis that deficits in the sensory systems could be as determinant for standing as muscle weakness in children with bilateral spastic CP

Classification of Chronic Pain at a Multidisciplinary Pain Rehabilitation Clinic

OBJECTIVE: To make a detailed diagnostic analysis of patients with chronic pain syndromes, including classification according to the International Association for the Study of Pain (IASP).DESIGN: Descriptive study of consecutive referrals during a two-year period.SETTING: A multidisciplinary out-patient pain clinic focused on occupational rehabilitation.SUBJECTS: A total of 309 chronic pain patients.METHODS: After a standardized multimodal physical and psychological examination, the chronic pain syndrome of each patient was assigned one or more clinical diagnoses; assigned to an etiological pain category (nociceptive pain, non-nociceptive including idiopathic pain, and psychological pain); and coded diagnostically according to IASP taxonomy.RESULTS: In all, 397 clinical diagnoses were made (ie, a mean of 1.3 diagnoses per patient). A large majority (87%) received a diagnosis of myalgia. Myofascial pain (trigger point syndrome) was diagnosed in two-thirds of the patients and was the most frequent clinical pain syndrome. A total of 51.8% of the pain syndromes were categorized as nociceptive, 43.0% as idiopathic and less than 1% as pain of psychological origin. Classification using the IASP system yielded a very high proportion of nociceptive, musculoskeletal pain syndromes of high intensity, with widespread pain and/or pain located in the neck/shoulder/arm region, and of dysfunctional etiology.CONCLUSIONS: Musculoskeletal pain was very common in this series, and myofascial pain syndromes were the most frequent specific pain disorders. However, myofascial pain had generally gone unrecognized by the referring physician. In contrast to findings of other studies, the incidence of low back pain and of primary psychological pain was low. Comparison of the results with those of Swedish epidemiological surveys showed the frequencies of the diagnoses in this series to be representative of chronic pain syndromes in the Swedish general population.</jats:p

The role of visual stimuli on standing posture in children with bilateral cerebral palsy

BACKGROUND: In children with bilateral cerebral palsy (CP) maintaining a standing position can be difficult. The fundamental motor task of standing independently is achieved by an interaction between the visual, somatosensory, and vestibular systems. In CP, the motor disorders are commonly accompanied by sensory and perceptual disturbances. Our aims were to examine the influence of visual stimuli on standing posture in relation to standing ability. METHODS: Three dimensional motion analysis with surface electromyography was recorded to describe body position, body movement, and muscle activity during three standing tasks: in a self-selected position, while blindfolded, and during an attention-demanding task. Participants were twenty-seven typically-developing (TD) children and 36 children with bilateral CP, of which 17 required support for standing (CP-SwS) and 19 stood without support (CP-SwoS). RESULTS: All children with CP stood with a more flexed body position than the TD children, even more pronounced in the children in CP-SwS. While blindfolded, the CP-SwS group further flexed their hips and knees, and increased muscle activity in knee extensors. In contrast, the children in CP-SwoS maintained the same body position but increased calf muscle activity. During the attention-demanding task, the children in CP-SwoS stood with more still head and knee positions and with less muscle activity. CONCLUSIONS: Visual input was important for children with CP to maintain a standing position. Without visual input the children who required support dropped into a further crouched position. The somatosensory and vestibular systems alone could not provide enough information about the body position in space without visual cues as a reference frame. In the children who stood without support, an intensified visual stimulus enhanced the ability to maintain a quiet standing position. It may be that impairments in the sensory systems are major contributors to the difficulties to stand erect in children with CP

Effects of intervention with sulindac and inulin/VSL#3 on mucosal and luminal factors in the pouch of patients with familial adenomatous polyposis

Contains fulltext : 97862.pdf (publisher's version ) (Open Access)BACKGROUND/AIM: In order to define future chemoprevention strategies for adenomas or carcinomas in the pouch of patients with familial adenomatous polyposis (FAP), a 4-weeks intervention with (1) sulindac, (2) inulin/VSL#3, and (3) sulindac/inulin/VSL#3 was performed on 17 patients with FAP in a single center intervention study. Primary endpoints were the risk parameters cell proliferation and glutathione S-transferase (GST) detoxification capacity in the pouch mucosa; secondary endpoints were the short chain fatty acid (SCFA) contents, pH, and cytotoxicity of fecal water. METHODS: Before the start and at the end of each 4-week intervention period, six biopsies of the pouch were taken and feces was collected during 24 h. Cell proliferation and GST enzyme activity was assessed in the biopsies and pH, SCFA contents, and cytotoxicity were assessed in the fecal water fraction. The three interventions (sulindac, inulin/VSL#3, sulindac/inulin/VSL#3) were compared with the Mann-Whitney U test. RESULTS: Cell proliferation was lower after sulindac or VSL#3/inulin, the combination treatment with sulindac/inulin/VSL#3 showed the opposite. GST enzyme activity was increased after sulindac or VSL#3/inulin, the combination treatment showed the opposite effect. However, no significance was reached in all these measures. Cytotoxicity, pH, and SCFA content of fecal water showed no differences at all among the three treatment groups. CONCLUSION: Our study revealed non-significant decreased cell proliferation and increased detoxification capacity after treatment with sulindac or VSL#3/inulin; however, combining both regimens did not show an additional effect

Cognitive-behaviour therapy for patients with Abridged Somatization Disorder (SSI 4,6) in primary care: a randomized, controlled study

Abstract Background Somatoform disorders are characterized by the presence of multiple somatic symptoms without an organic cause that completely explains their symptoms. These patients generate a high cost in health services. We aim to evaluate the effectiveness and feasibility of a cognitive-behaviour therapy (CBT) programme, administered in group and individual formats in primary care for patients who are diagnosed with abridged somatization disorder. Method/design Design: Multicentre, randomized, controlled trial involving 3 groups, one of which is the control group consisting of standardized recommended treatment for somatization disorder in primary care (Smith's norms) and the 2 others, the intervention groups, consisting of cognitive-behavioural therapy (10 sessions) administered in individual format (intervention group 1) or in group format (intervention group 2). Setting: 29 primary care health centres in the province of Zaragoza and 3 primary care health centres in the province of Mallorca, Spain. Sample: N = 204 patients, (68 in each of the three groups), aged 18–65 years, able to understand and read Spanish, who fulfil Escobar's criteria of Abridgged Somatization Disorder (SSI 4,6), stable with pharmacotherapy over the previous month, and who will remain stable for the next 3 months in the doctor's opinion, having signed informed consent. Intervention: Control group: Standardized recommended treatment for somatization disorder in primary care (Smith's norms). Intervention group: 10 weekly sessions of CBT, following a protocol designed by Prof. Escobar's group at UMDNJ, USA. There are 2 different treatment conditions: individual and group format. Measurements: Survey on the use of health services, number and severity of somatic symptoms, anxiety, depression, quality of life and clinical global impression. The interviewers will not know which group the patient belongs to (blind). The assessments will be carried out at baseline, post-treatment, 6 months and 12 post-treatment. Main variables: Utilization of health services, number and severity of somatic symptoms. Analysis: The analysis will be per intent to treat. We will use the general linear models of the SPSS v.15 statistical package, to analyse the effect of treatment on the result variable (utilization of health services, number and severity of somatic symptoms). Discussion It is necessary to develop more effective psychological treatments for somatoform disorders. This randomised clinical trial will determine whether cognitive behaviour therapy, both in group or in individual format, is effective for the treatment of these patients. Trial registration Current controlled trials ISRCTN69944771</p

The ‘microflora hypothesis’ of allergic diseases

Increasingly, epidemiologic and clinical data support the hypothesis that perturbations in the gastrointestinal (GI) microbiota because of antibiotic use and dietary differences in ‘industrialized’ countries have disrupted the normal microbiota-mediated mechanisms of immunological tolerance in the mucosa, leading to an increase in the incidence of allergic airway disease. The data supporting this ‘microflora hypothesis’ includes correlations between allergic airway disease and (1) antibiotic use early in life, (2) altered fecal microbiota and (3) dietary changes over the past two decades. Our laboratory has recently demonstrated that mice can develop allergic airway responses to allergens if their endogenous microbiota is altered at the time of first allergen exposure. These experimental and clinical observations are consistent with other studies demonstrating that the endogenous microbiota plays a significant role in shaping the development of the immune system. Data are beginning to accumulate that a ‘balanced’ microbiota plays a positive role in maintaining mucosal immunologic tolerance long after post-natal development. Other studies have demonstrated that even small volumes delivered to the nasopharynx largely end up in the GI tract, suggesting that airway tolerance and oral tolerance may operate simultaneously. The mechanism of microbiota modulation of host immunity is not known; however, host and microbial oxylipins are one potential set of immunomodulatory molecules that may control mucosal tolerance. The cumulative data are beginning to support the notion that probiotic and prebiotic strategies be considered for patients coming off of antibiotic therapy.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/73451/1/j.1365-2222.2005.02379.x.pd