Thesis (Ph. D.)--University of Wisconsin--Madison, 1973. / Typescript. Vita. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references.

Thesis (M.S.)--Virginia Polytechnic Institute and State University, 1994. / Vita. Abstract. Includes bibliographical references (leaves 60-61). Also available via the Internet.

Thesis (Ph.D.)--University of Nebraska-Lincoln, 2008. / Title from title screen (site viewed Sept. 18, 2008). PDF text: iv, 127 p. : ill. ; 573 K. UMI publication number: AAT 3303505. Includes bibliographical references. Also available in microfilm and microfiche formats.

Thesis (doctoral)--Umeå University, Sweden, 1995. / Added t.p. with thesis statement inserted. Includes bibliographical references.

Tübingen, University, Diss., 1999.

Thesis (M.Eng.)--University of Louisville, 2007. / Title and description from thesis home page (viewed May 9, 2007). Department of Mechanical Engineering. Vita. "May 2007." Includes bibliographical references (p. 107-111).

No description available.

Based on accident reports, oblique head impacts associated with rotational acceleration occur frequently in cycling. Rotational acceleration stimulates brain tissue strain resulting in mild to severe brain injuries. Current bicycle helmet standards test for linear acceleration, but not for rotational acceleration. The proposed standard (EN13087-11) by the European Committee for Standardization (CEN) and the Angular Launched Impact (ALI) protocol are oblique test protocols which impart rotational acceleration to the head at three impact locations (Front_Y, Lateral_X and Lateral_Z). The CEN proposed standard drops the helmeted headform vertically onto a 45° steel anvil, while the ALI protocol launches the headform at an angle of 45° towards the steel surface. The CEN proposed standard may represent a cyclist falling vertically onto a curb, angled surface or motor vehicle. The ALI represents a cyclist skidding or falling over the handlebars and have been described as frequent-accident cases in the literature. Both protocols represent unique falling events in cycling which elicit distinct rotational head responses. The purpose of this study was to compare the dynamic head response and brain tissue deformation between the two oblique test protocols on two common types of cycling helmets (PVC shell-PU liner and ABS shell-EPS liner). The study revealed that falling vertically onto a curb, angled surface or motor vehicle (CEN proposed standard), resulted in a greater rotational head response and brain tissue deformation, compared to frequent-accident events of skidding or falling over the handlebars (ALI protocol). Linear and rotational acceleration were significantly less on the PVC shell-PU liner compared to the ABS shell-EPS liner on both oblique test protocols. Distinct impact vectors associated with unique falling events in cycling create different rotational head responses and brain tissue deformation. Helmet standards should consider incorporating oblique testing methods, to manage mild and severe brain injuries associated with frequent falling events in cycling.

A study was undertaken to identify the effect of head flexion/extension on singing voice quality. The amplitude of the fundamental frequency (F0), and the singing power ratio (SPR), an indirect measure of singer’s formant activity, were measured. F0 and SPR scores at four experimental head positions were compared with the subjects’ scores at their habitual positions. Three vowels and three pitch levels were tested. F0 amplitudes and low frequency partials in general were greater with more extended head positions, while SPR increased with neck flexion. No effect of pitch or vowel was found. Gains in SPR appear to be the result of damping low frequency partials rather than amplifying those in the singer’s formant region. Raising the amplitude of F0 is an important resonance tool for female voices in the high range, and may be of benefit to other voice types in resonance, loudness, and laryngeal function.

ABSTRACT Trauma in South Africa has been described as a “malignant epidemic” (Muckart DJ, 1991)5. Trauma is most acute in Sub-Saharan Africa, where deaths from trauma is higher than in any other region of the world where the risk of death from injury is greatest, especially for men aged 15-29 years (Murray CJL, in Bowley etal, 2002)5.The recognition of concurrent life threatening injuries is critical, given that patients with facial fractures seldom die in the absence of airway problems, massive bleeding, aspiration of blood into the lungs and massive head injury30. There are several reports in the literature regarding multisystem trauma and facial fractures. Head injuries are commonly associated with facial fractures, and facial fractures can be markers for brain injury16 .This study is aimed to identify the prevalence of head injuries associated with maxillofacial trauma in the Johannesburg General Hospital, Gauteng, South Africa. The data was collected from 1st January 2003 to 30th June 2003. A total of 196 patients with maxillofacial injuries were treated and 176 were included in the study. The data was analyzed using SASTM for WindowsTM. From the results it was found that of the 176 patients the majority were males comprising 88.07% of the study. Based on the GCS scores alone it was shown that 38.06% patients suffered head injuries. After reviewing patient records, it was found that of the whole sample only 31.25% of patients suffered true head injuries based on CT scan and neurosurgery findings. It was also shown that the most frequent mechanism of injury with headinjuries was gunshot wounds at 52.72% and the most common maxillofacial injury associated with head injury was panfacial fractures at 23.63%. In this study we also reviewed the outcome of the patients based on mortality rates. A total of 24 patients (13.63%) died from associated injuries. Of these patients 2 (1.13%) died from associated injuries due to polytrauma and 22 (12.5%) died due to severe head injury. We found that severe maxillofacial injuries involving the midfacial region such as panfacial fractures, zygomatic complex fractures and Le Fort fractures are frequently seen in patients with significant head injury. This should alert trauma unit personnel during assessment of patients to the fact that if a patient presents with significant midfacial trauma, one might expect that an underlying head injury is present. It is important to make note, that of the associated injuries present with maxillofacial trauma, involvement of the central nervous system including concussion, is the most frequent.