This study determined the parameters which affect the internal mask inspiratory pressure and flow rate during respirator wear. The average inspiratory pressure and inspiratory flow rate were measured on 30 subjects who performed various submaximal work rates on a cycle ergometer while wearing air purifying respirators. The half-mask and full-face respirators were equipped with three levels of cartridge resistance. The results indicated that work rate, cartridge resistance, and mask type affected the inspiratory pressure and flow rate significantly. The findings of this study would allow the quantitative negative pressure respirator fit test to evaluate respirator fit over a wide range and representative of actual work condition.

No description available.

No description available.

Thesis (M.S.)--University of Wisconsin--Madison, 1980. / Typescript. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 83-84).

Thesis (M.S.)--West Virginia University, 2000. / Title from document title page. Document formatted into pages; contains ix, 87 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 69-73).

Present methods of monitoring, anesthetic breathing circuits for mechanical faults are flawed by inadequacies in the design of disconnect/pressure monitors (DPMs), devices which monitor breathing circuit pressure waveforms. Such inadequacies are investigated, and their cause is identified. A microprocessor based DPM, which applies pattern recognition techniques to the task of disconnect monitoring is proposed, and its design and implementation are presented. Technical and clinical trials show that the prototype DPM consistently detects almost all mechanical faults in the anesthetic breathing circuit. It is concluded that pattern recognition based DPMs are significantly more effective than their present day counterparts. / Applied Science, Faculty of / Electrical and Computer Engineering, Department of / Graduate

No description available.

A model was developed to predict the increased physiological effort of wearing a respiratory protective device. Specifically, the model was designed to predict the effects of varying ventilatory demands on eleven respiratory variables of the man-respirator system, breath frequency (f_b), tidal volume (V_t), inspiratory flow (dvi/dt), expiratory flow (dve/dt), inspiratory mask pressure (P_mi), expiratory mask pressure (P_me), inspiratory intrathoracic pressure (P_ii), expiratory intrathoracic pressure (P_ie), inspiratory mask work (W_mi), expiratory mask work (W_me), and mask leakage index (L_i). The model was tested by experiment in which three male subjects underwent maximal exercise testing with and without the "pressure-demand" respirator. The eleven variables were determined for each thirty second period utilizing on-line computer analysis. Application of the model to these experimental conditions resulted in significant (p<.001) relationships between each of the predicted and observed variables.

Thesis (Ph. D.)--University of Western Sydney, 2002. / A thesis submitted in fulfillment of the requirement for the degree of Doctor of Philosophy at the University of Western Sydney, College of Science, Technology and Environment, 2002. Includes bibliographical references (p. 352-370).

Thesis (M.S.)--University of Wisconsin--Madison, 1980. / Typescript. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 201-205).