Showing papers by "California State University, Long Beach published in 1973"

Adhesive-bonded scarf and stepped-lap joints

Abstract: Continuum mechanics solutions are derived for the static load-carrying capacity of scarf and stepped-lap adhesive-bonded joints. The analyses account for adhesive plasticity and adherend stiffness imbalance and thermal mismatch. The scarf joint solutions include a simple algebraic formula which serves as a close lower bound, within a small fraction of a per cent of the true answer for most practical geometries and materials. Digital computer programs were developed and, for the stepped-lap joints, the critical adherend and adhesive stresses are computed for each step. The scarf joint solutions exhibit grossly different behavior from that for double-lap joints for long overlaps inasmuch as that the potential bond shear strength continues to increase with indefinitely long overlaps on the scarf joints. The stepped-lap joint solutions exhibit some characteristics of both the scarf and double-lap joints. The stepped-lap computer program handles arbitrary (different) step lengths and thickness and the solutions obtained have clarified potentially weak design details and the remedies. The program has been used effectively to optimize the joint proportions.

Observing systems with unmmeasurable inputs

Abstract: Known results on dynamic feedback controllers for linear systems with unknown disturbances are extended to cases where the disturbances satisfy differential equations with arbitrary characteristic roots and where the state is not directly available for measurement. An observability test for existence of the controller and relations for its dynamic order are presented.

Reinforced earth retaining walls

Abstract: Reinforced earth is a man-made earth fill in which thin bars, rods, fibers, or nets have been placed to improve the overall qualities of the soil This paper describes the results of analytical and laboratory studies on small reinforced earth retaining walls Experimental data were compared to analytical solutions for wall failure by either pullout or breaking of the reinforcing elements, and found to be in reasonable agreement Cost estimates for prototype structures suggest that the cost of reinforced earth could be as low as half the cost of other conventional earth retaining walls

Assimilation and Changing Social Roles of Chinese Americans.

Abstract: This article is concerned with the effects of social change on the role relationships and adjustment of Chinese Americans. The influences of cultural and social assimilation have undermined the commitment of Chinese youths to traditional cultural norms, and social disequilibrium can be seen within the family as well as outside the home. The changing sex role of females has affected their relationships with their parents and the opposite sex. Chinese vary in the extent to which they have become progressively removed from their parental culture, and the social distances between Chinese with different life styles have segregated them into a variety of disparate groups. Some of the changes in the psychological and social characteristics of the Chinese are examined from empirical studies.

Hypopigmentation in tinea versicolor: a histochemical and ectronmicroscopic study

Abstract: The mechanism (s) which produce hypopigmentation in tinea versicolor infections has not been systematically studied. It is generally considered that the fungus may filter ultraviolet light and prevent tanning of the infected area.i' 2 However, the depigmentation of the genital area in Negro Jamaican babies secondary to tinea versicolor infection,^ the recent report of multiple hypopigmented macules of tinea versicolor on the shaft of the penis'* and our clinical observation of sunburning limited to hypopigmented patches of tinea versicolor noted in Vietnam returnees make this hypothesis unlikely. Other theories which attempt to explain this phenomenon include failure in melanin granule transfer caused by increased keratinization,^ or a thinning of the stratum cornevun with subsequent loss of melanin granules contained within this legion.^ However, no

Pulse quaternary communication means

Abstract: A pulse quaternary modulator especially to enable laser communication systems when working at high data rates to be able to operate on less laser power and on a modulation format that improves modulation efficiency. The subject modulation means can be used in transmitters and receivers and include means that make use of polarization changes in the modulator to create selective high speed electronically controlled optical time delays, and it also includes means for using a combination of polarization state and pulse position information to represent information choices. The subject means are also able to achieve M-ARY modulation when using as a source a mode-lock laser which produces output laser pulses.

Hyperbaric Oxygen Treatment of Mandibular Osteomyelitis: Report of Three Cases

Abstract: Hyperbaric oxygen was used in the treatment of intractable osteomyelitis of the mandible. Dentists are frequently called on to manage postoperative bone infections. In spite of comprehensive antibiotic therapy, the occurrence of osteomyelitis after tooth extraction is not infrequent. The dentist is then faced with management of an intractable infection of the bone that seems to resist all conventional therapy. Hyperbaric oxygenation from the study reported here appears to offer a new type of treatment for these resistant cases of osteomyelitis.

Kinematic eddy viscosity at low Reynolds numbers.

Abstract: with A = A + v(tw/p)~]-/2, and showed that when Eqs. (3) (with a = 0.0168) and (5) were used as the eddy- viscosity formulation in the solution of the boundary-layer equations, the agreement with experiment was improved. Bushnell and Morris6 made measurements in hypersonic turbulent boundary layers at low Reynolds numbers. They observed that when they calculated the eddy-viscosity distribution from their data, the variations with Reynolds number of the parameters K and a in the inner and the outer eddy-viscosity formulas were similar to those in Refs. 5 and 4. Recently Huffman and Bradshaw7 concluded, after examining a large number of experimental data, that the parameter K in Eq. (5) was a constant. As may be seen from all these studies, the question of the universality of these constants is not settled. In the present Note we attempt to settle the question by showing that the parameter a is not a universal constant, but that K is— at least according to the calculations done by the author.

Permafrost structural support with integral heat pipe means

Abstract: Structural support assembly for use in arctic and subarctic (permafrost) areas or in any areas where the upper ground layer is subject to a severe annual freeze-thaw cycle, including the cooperative combination of a support structure and a heat pipe element installed in generally frozen soil. The heat pipe is of a suitably complementary configuration and/or disposition with respect to the support structure to provide appropriate stabilization of the surrounding frozen soil. In one embodiment, the heat pipe element is disposed externally of the support structure and, in another embodiment, it is disposed internally of such structure. The external embodiment further includes one version employing a linear (straight) heat pipe element and another version employing an angular (helical) element. The internal embodiment further includes one version wherein a heat pipe is integrally combined with a support structure and another version wherein a heat pipe is cooperatively installed inside a support structure.

Herpes zoster of the anogenital area affecting urination and defaecation

Abstract: SUMMARY Herpes zoster of the anogenital area is reported in six patients. The inability to urinate and to defaecate is a serious complication. This entity is well known in the urological but seemingly unreported in the dermatological literature. None of these patients had a recurrence of the herpes, nor did any have a known neoplasm.

Eddy-Viscosity Distribution in Thick Axisymmetric Turbulent Boundary Layers

Abstract: An eddy-viscosity formulation for thick axisymmetric turbulent boundary layers is presented. Calculations made with this formulation show good agreement with experiment for both incompressible and compressible flows.

Myopic Perceptions and Textbooks: Chinese Americans' Search for Identity1

Abstract: Americans have perpetuated inaccurate images and attitudes concerning the Chinese that suggest the operation of social-psychological anomalies and prevent the growth of healthy human relations. Narrow stereotypic perceptions of and prejudice toward the Chinese have been so pervasive and tenable that Americans of Chinese ancestry do not perceive themselves with a meaningful identity. Examination of American social studies textbooks for elementary and secondary schools shows that Asian studies and the involvement of Asians in American history are barely mentioned or neglected completely; furthermore what information is given reinforces stereotypic illusions. There is rising protest and counterresponse to the restrictive perceptions among younger Asian Americans who seek the identity and acceptance they have been denied by others and themselves.

Stress coining tool fastened joint

Abstract: A stress coining fastened joint, for minimizing stress concentration in a wall of an aperture in a metallic structural member, the tool being a rigid elongated shaft adapted for forcible insertion through the aperture. The shaft has end portions and is provided with a plurality of different diameter, annular protuberances spaced intermediate the end portions. The largest of the protuberances has a diameter of such predetermined relationship to the diameter of the aperture, that upon a forced insertion thereof through the aperture the material forming the wall of the aperture is displaced radially substantially the difference between the diameter of the largest protuberance and the diameter of the aperture. The displaced material will thereafter rebound approximately one-half of the initial displacement. The stress coining tool may be combined with a conventional fastener to provide a simultaneous stress coining and fastening operation.

Saliva Calcium and Potassium Concentrations in the Detection of Digitalis Toxicity

Abstract: Stimulated whole saliva was collected from 118 subjects: 36 were not receiving digitalis; 40 received digitalis but were nontoxic; 14 were digitalis-toxic; 24 had impaired renal function; and four subjects were followed during the administration of digitalis. Saliva calcium and potassium products in the digitalis-toxic group were significantly higher than in the nontoxic group. Subjects with impaired renal function had a significantly higher saliva calcium and potassium product than those with normal renal function. The subjects followed during the administration of digoxin showed an apparent correlation between electrocardiogram changes and an elevated saliva calcium and potassium product. This study has demonstrated that a whole-saliva calcium and potassium product over 300 in subjects on digoxin with normal renal function correlates with a diagnosis of digitalis toxicity.

Carbohydrate metabolism in the striped shore crab, Pachygrapsus crassipes—I. The glycolytic enzymes of gill, hepatopancreas, heart and leg muscles

Abstract: 1. 1. Optimum specific activities and maximal catalytic capacities for twelve of the enzymes of the glycolytic and pentose phosphate pathways were measured in gill, hepatopancreas and muscle tissue extracts from Pachygrapsus crassipes. 2. 2. Oxygen consumption studies with gill and hepatopancreas, utilizing both intact and homogenized preparations, showed no significant difference between these tissues. 3. 3. Results are discussed and compared to available crustacean data, as well as to data from vertebrate tissue studies. 4. 4. Possible mechanisms for the control of glycolysis in crustacean tissues are discussed.

Carbohydrate metabolism in the steroid shore crab, Pachygrapsus crassipes—II. Glycolytic rates of muscle, gill and hepatopancreas

Abstract: 1. 1. Lactate concentration, lactate production from glucose in a fortified medium and the soluble protein content of cheliped and thoracic muscles, gill and hepatopancreas of Pachygrapsus crassipes were measured. 2. 2. The glycolytic rates of cheliped and thoracic muscles and gill were about 14, 10 and 7 μmoles of lactate per hr per g tissue respectively. Little glycolytic activity was detected in the hepatopancreas. 3. 3. The glycolytic rates were highest in September and lowest in December. 4. 4. There were no detectable differences in the rates of lactate formation in crabs from different stages of the molt cycle.

Multi-stage well-drilling mast assembly

Abstract: A multi-stage, well-drilling mast assembly, particularly adapted to mobile drilling platforms, such as drilling vessels, the assembly having a main stage mast and an auxiliary mast, both pivoted to the platform for swinging movements between horizontal and vertical positions. The main stage carries well pipe hoisting equipment, and the auxiliary stage carries rack equipment for vertically storing well pipe, and racker equipment for moving the well pipe between the rack and the center line of the mast assembly. Slings operated by the hoisting equipment swing the stages between horizontal and vertical positions. A low profile and a low center of gravity are achieved when the stages are horizontally disposed. The distribution of the weight of the hoist, the rack, and the rackers between the stages of the mast assembly provides a multi-stage mast assembly in which the individual stages may be conveniently swung between reclined and vertical, well-drilling positions.

Continuous belt system holding multiple layers

Abstract: A continuous belt system engaging and holding for parallel motion multiple layers of fabric A pair of belts holds the layers along their edges in stacked spaced relationship while the layers pass through tufting and foaming stations in the manufacture of three-dimensional reinforced insulation

Bearing housing for high speed rotating shafts

Abstract: A bearing housing for high speed rotating shafts wherein the bearing housing is constructed in two parts with the bearing being of the semi-floating type. One part of the bearing housing presses against the bearing to resist any axial thrust that may be exerted on the bearing during high speed operation. The bearing is floating on a lubricant around its outer diameter in the other portion of the two part bearing housing. With the bearing being stationary in the housing, the only critical surface becomes the internal surface between the bearing and the shaft itself. By varying the position of the two parts of the bearing housing, the passage for the lubricant to enter the bearing housing can be located at a near vertical position while permitting desired orientation of the end of the bearing housing.

Projectile recovery system with quick opening valves

Abstract: A projectile recovery system where projectile speed is progressively reduced as the projectile passes through decelerator tubes. These tubes are precharged to high pressure in front of the projectile to minimize the decelerating distance. Quick opening valves, which separate the deceleration tubes and which seal them for pressurization, are opened as the projectile approaches so they will not be struck by the projectile with resulting damage.

Some problems of the calculation of three-dimensional boundary layer flows on general configurations

Abstract: An accurate solution of the three-dimensional boundary layer equations over general configurations such as those encountered in aircraft and space shuttle design requires a very efficient, fast, and accurate numerical method with suitable turbulence models for the Reynolds stresses. The efficiency, speed, and accuracy of a three-dimensional numerical method together with the turbulence models for the Reynolds stresses are examined. The numerical method is the implicit two-point finite difference approach (Box Method) developed by Keller and applied to the boundary layer equations by Keller and Cebeci. In addition, a study of some of the problems that may arise in the solution of these equations for three-dimensional boundary layer flows over general configurations.

Induced recovery of particles from sub-surface formations

Abstract: Metallic particles are recovered from a sub-surface formation by: A. PRODUCING A FLOW OF LIQUID IN THE SUB-SURFACE FORMATION EXTENDING BETWEEN SPACED SUB-SURFACE LOCALITIES, AND SUFFICIENT TO DISPLACE METALLIC PARTICLES FROM WITHIN THE FORMATION TO ONE OF SAID LOCALITIES, AND B. RETRIEVING METALLIC PARTICLES DISPLACED TO SAID ONE LOCALITY.

Pathways of carbohydrate metabolism in Microcyclus species.

Abstract: Radiorespirometric and enzymatic studies were conducted to determine primary and secondary pathways of carbohydrate catabolism in Microcyclus aquaticus and M. flavus. M. aquaticus catabolizes both glucose and gluconate mainly via the Entner-Doudoroff and pentose phosphate pathways with some concurrent participation of the Embden-Meyerhof pathway. M. flavus, however, oxidizes glucose mainly via the Embden-Meyerhof pathway and gluconate via the Entner-Doudoroff pathway with some simultaneous operation of the pentose phosphate pathway. Both of the organisms showed evidence of the tricarboxylic acid cycle as a secondary pathway for the oxidation of carbohydrates.