A model has been developed that predicts spring wheat grain and dry matter yield. Preliminary tests show very favorable results when predicting grain yield in two different climatic regimes, one being a dryland and another being an irrigated area. The strenghts of the model lie in its simplicity, relatively available input data, and low computer processing time cost. Weakness of the model stem from the assumptions that allow its simplicity. The basic assumption in the model is that grain and dry matter yield can be related to the ratio of actual to potential transpiration, computed for each of five phenological stages. Actual and potential evapotranspiration, transpiration, and soil evaporation are obtained in the model by numerical operations on a potential evapotranspiration/potential soil evaporation array obtained by empirical formulae or pan data, and a modified crop coefficient. Soil water status is monitored in the model by taking into account the balance of irrigation, drainage, precipitation, soil water storage and evapotranspiration. Phenological data is computed by a simple numerical formula utilizing maximum and minimum temperatures during the season. Good agreement was found in comparing predicted versus actual heading date for four varieties over four different years. A field study was carried out to aid in model calibration and testing. A continuous variable plot design, with two replications of each of five spring wheat varieties (two soft whit spring wheats and three hard red spring wheats)> This allowed a large number of data points to be measured that related yield to many water levels within the soil. Although this design leads to difficulties in classical statistical analysis, it was shown to be especially useful in calibration of a model of the type shown herein.

Any marsh is a distinctive land-forrm of varied interest. To the agriculturist it is wasteland to be reclaimed; to the naturalist, a habitat of aesthetic value. To the ecologist, however, a marsh represents a complexity of vegetation under the influences of many and often inseparable factors. It becomes a place of challenging study. There exists a notable lack of information treating the ecology of inland salt-marshes. Still less known are the ecological conditions imposed upon plant life in marshes arising from saline springs. The presence of such a wetland in western Utah afforded the opportunity to study salt-marsh vegetation in a highly specialized habitat. The study had two phases. First was a study of the vegetation. Data were secured from collections and study plots within each of the major marsh communities. General descriptions of other plant life were additionally compiled. It is not within the scope of this paper to discuss or rigidly define the requirements embraced in the use of "community" as a unit of vegetation. Sufficient references are available for those who wish to pursue the point. In this study, a community is a congregation of plants exhibiting differences in appearance and species composition from other plant congregations. Secondly, studies were directed to the influences of soil and water on the ecology of each community. Transects were used to investigate many of these relationships. Transition zones between communities were narrow and usually sharply delineated. Transects intersected ecotones of this sort; environmental differences which may have occurred in the few broader ecotones were assumed to be of equal magnitude but of more gradual rate of change . Relatively short transects thus adequately represented each community yet allowed collection of intensive data. Information and data were collected during a 5-week period in August and September 1959 and a 6-month period beginning in March 1960.

No description available.

AN ABSTRACT OF THE DISSERTATION OFKimberly Noel Turner, for the Doctor of Philosophy degree in Political Science, presented on June 9, 2021, at Southern Illinois University Carbondale. TITLE: EDUCATION BULGES AND MASS PROTEST: HOW HIGHER EDUCATION INFLUENCES PROTEST ONSET AND OUTCOMESMAJOR PROFESSOR: Dr. Stephen BloomCan trends in higher education attainment explain protest onset and outcomes? Beneficial state development indicators, such as education attainment, may produce detrimental employment outcomes. Nonviolent protests spread throughout the developing world throughout the 2010s, often in countries previously immune to public agitation. At the forefront of these protests were well-educated professionals, often doctors and lawyers. Why did these protests emerge? Why did middle-class groups initiate and lead these protests? How successful were these protests? The education bulge theory provides a framework for explaining the onset and outcomes of nonviolent mass protests in repressive countries. The education bulge theory captures the formation of skilled labor grievance and the spillover that influence the emergence of nonviolent, large and diverse protests. Chapter Two details the education bulge theory. Education bulges occur when a country undergoes sharp increases in university enrollments exceeding global averages. As university graduates increases, so does the supply of skilled labor. An increasing percentage of the population is then impacted when demand for skilled labor wanes, i.e. skills downgrading. Skills downgrading worsens the relative position of university graduates to other educational attainment groups, increasing tertiary unemployment and underemployment. Skilled labor compensates by downshifting, seeking out and competing for positions within the semi-skilled job market. This increased competition for semi-skilled positions pushes other educational groups down and out of the labor market. The global forces of labor polarization, education bulges, and skills downgrading are examined for their roles in inducing downshifting behavior. The fomentation of grievance amongst skilled labor is detailed, as well as the spillover effects for semi and unskilled labor. Flattening supplies of knowledge-intensive positions within the private sector along with public sector hiring reductions in the post-recession period exacerbates the decline of skilled labor’s relative position. Chapter Three examines objective measures of skilled labor’s relative position to other education attainment groups. Alongside theories of economic development and inequality, the education bulge theory is tested for its relationship to protest onset. Governmental expenditures on education, relative unemployment amongst primary, secondary and tertiary education attainment groups, and average wage growth are evaluated for their relationship with education bulges and protest onset. Bivariate and multivariate regression analysis indicate that skills downgrading is significantly increases the odds of protests emerging in highly repressive countries. Under an education bulge, additional governmental spending on tertiary education is positively correlated to protest onset. Do education bulges contribute to the overall successfulness of protests? In Chapter Four, I develop a new cost-benefit approach to measuring protest success. Canonical binary measurement of protest success fails to capture the relative concessions demonstrators might extract from their regimes. I develop a 21-point scale capturing the dimensions of gains protests might achieve (in the form of regime concessions) and the costs they pay for those concessions (in the form of state reprisals). Using Mokken scale analysis, country success scores pinpoint a protest’s position along a unidimensional continuum of abject failure to transformative changes in the body politic is developed. My measure offers an improved method of capturing regime behavior in the form of ‘ignoring’ and active repression. My measure also captures instances where protests may be misclassified as failures and features a stronger correlation for crowd age diversity. However, the success scores and binary measures often share directionality and strength for key causal factors. Thus, I cannot claim a definitive victory for my measure. However, unlike binary measures, my measure is able to offer more accurate confidence intervals for interactive relationships evaluated in Chapter Five. Chapter Five evaluates the relationship between political contexts and protest features. Entrenched leadership and repressive state structures are traditional deterrents to protest success. Education bulges, leadership tenure, and state repressiveness are evaluated for their influence on protest successfulness. Education bulges are found to increase overall protest successfulness. Education bulges are also found to increase crowd size and crowd diversity. Interactive relationships between education bulges, crowd size, and class diversity are examined. Class diversity and education bulges are individual have a positive and significant influence upon protest success. Education bulges are found to moderate class diversity, shifting class diversity’s effect on protest success from positive to negative. Regime concessions and protest successfulness are also influenced by external factors, such as sanctions, defections, and audience sympathy. External actors are more likely to apply reputational, material or defection costs against regimes when protests occur within education bulges and feature class diversity. These costs act as mediators of regime responsiveness. Under a mediated moderation model, the direct and indirect effect of education bulges, crowd size, class diversity, and regime costs are evaluated for their effect on protest successfulness. Education bulges increase reputational costs for regimes while class diversity increases material costs. Crowd size increased both material costs and defections. Education bulge contexts producing diverse and large crowds are more successful than non-education bulge protests. This study offers an examination of the role of higher education attainment upon the emergence and successfulness of nonviolent mass protests in authoritarian states from 2005-2013. Despite data limitations, robust findings indicate that education bulges increase the odds of a stable repressive regime experiencing protest onset and protest success. Failure of central governments to ensure commiserate employment for their growing pools of skilled labor increases grievance, crowd sizes and diversity, and punitive action against governments seeking to repress demonstrators.

<p> Flexural vibrations of a shaft mounted at each end on a non - linear spring have been studied. Theoretical analysis is carried out for the cubic non-linear spring. </p> <p> The effect of mountirig of a heavy rotor on the shaft has been considered. The stability analysis of the system is also given in the theoretical analysis.</p> / Thesis / Master of Engineering (ME)

An increasing number of mechanical systems are being designed on the micro and meso scales. Assembly and maintenance become increasingly difficult as the size of mechanisms decrease, and the minimum size of traditional elements such as bearings and springs is limited. The backlash of bearings also limits their usefulness in applications where high precision and repeatability are needed. At small scales and for high precision applications, alternative, non-traditional elements are needed. The objective of this thesis is to develop reliable and scalable compliant components to replace bearings and helical springs. Components replacing springs must be able to produce specified torque/motion requirements. Components replacing bearings must permit sufficient motion about the axis of rotation, bear specified loads in the lateral directions, and fit within roughly the same design space as a bearing. Additionally, all components will be designed to be manufactured using in-plane fabrication processes. Practical application of the components will be demonstrated by their use in Sandia National Laboratory's Stronglink assembly. The concepts discussed in this thesis fall into three categories: mechanisms that replace 1) the helical spring, 2) the bearing, and 3) both the helical spring and the bearing. The serpentine flexure belongs to the first category, the compliant rolling-contact element (CORE), CORE bearing, and elliptical CORE bearing belong to the second, and the compliant contact-aided revolute (CCAR) joint belongs to the third category.

We introduce to computer graphics the Pseudo-Rigid-Body Mechanism (PRBM) and the chain algorithm from mechanical engineering, with a unified tutorial from disparate source materials. The PRBM has been used successfully to simplify the simulation of non-linearly elastic beams, using deflections of an analogous spring and rigid-body linkage. It offers computational efficiency as well as an automatic parameterization in terms of physically measurable, intuitive inputs which fit naturally into existing animation work flows for character articulation. The chain algorithm is a technique for simulating the deflection of complicated elastic bodies in terms of straight elastic elements, which has recently been extended to incorporate PRBM beam-elements in three dimensions. We present a new, mathematically equivalent optimization of the 3D PRBM chain algorithm, from its former asymptotic complexity of O(n^2) in the number of elements n, to O(n). We also extend an existing PRBM for combined moment-force loads to 3D, where the existing 3D PRBM chain algorithm was limited to 3D PRBM elements for a moment-only load. This optimization and extension are validated by duplicating prior experimental results, but substituting the new optimization and combined-load elements. Finally, a loose road-map is provided with several key considerations for future extension of the techniques to dynamic simulations.

Yes / Background: Individuals with lower-limb amputation can use running specific prostheses (RSP) that store and then return elastic energy during stance. However, it is unclear whether varying the stiffness category of the same RSP affects spring-mass behaviour during self-selected, submaximal speed running in individuals with unilateral transtibial amputation. Research question: The current study investigates how varying RSP stiffness affects limb stiffness, running performance, and associated joint kinetics in individuals with a unilateral transtibial amputation. Methods: Kinematic and ground reaction force data were collected from eight males with unilateral transtibial amputation who ran at self-selected submaximal speeds along a 15 m runway in three RSP stiffness conditions; recommended habitual stiffness (HAB) and, following 10-minutes of familiarisation, stiffness categories above (+1) and below (-1) the HAB. Stance-phase centre of mass velocity, contact time, limb stiffness’ and joint/RSP work were computed for each limb across RSP stiffness conditions. Results: With increased RSP stiffness, prosthetic limb stiffness increased, whilst intact limb stiffness decreased slightly (p

<p> The following study describes the evolution of Alexander Pope's Pastorals from their embryonic state in the earliest extant manuscript of them, the Houghton holograph, to their final resting place in the last authorized version of them, the posthumous 1751 edition of the poet's Works edited by his friend and literary executor, Rev. William Warburton. During this period the four poems -- "Spring", "Summer", "Autumn" and "Winter" -- and the brief critical treatise that accompanied them underwent hundreds of alterations, from single words to entire stanzas. A careful examination of the earliest extant version, in conjunction with a close study of the many changes and additions Pope made during this lifetime, provides a considerable amount of information concerning precisely what Pop endeavours to accomplish in creating this cycle of poems. A xerox copy of the Houghton holograph, together with a diplomatic transcript of it and a list of all subsequent authorized alterations to the text has been included to facilitate the study. Though some of the variants of this holograph have been cited (with varying degrees of accuracy) in previous editions of Pope's poetry, the manuscript itself has never before been reproduced in its entirety. </p> <p> This study concentrates particularly upon the evolution of the Pastorals primarily because a comparison of the final version of any given passage with earlier versions often makes the poet's intentions clearer. Pope himself would seem to have been aware of this fact since he includes a number of variant readings from manuscripts and earlier printed texts in the notes he appends to these poems in the 1736 edition of his Works. Likewise, an examination of the sources of Pope's allusions to other poems in the pastoral tradition -- some though by no means all of which he also records in his 1736 notes -- sheds additional light on the poet's meeting. Though the vast majority of these allusions have been identified by previous scholars, their function in the poems themselves has to date been, for the most part, ignored. Yet, as this study demonstrates, these allusions and their contexts form an integral part of the poet's design, frequently providing an oblique, but highly pertinent comment upon what is actually taking place. </p> <p> This study leads ultimately to a new reading of the Pastorals, one that focuses upon the numerous alterations and additions to them between 1704 -- the supposed date of the Houghton holograph which may be regarded as their first limited "edition" -- and 1751. Particular emphasis is placed on the major additions -- the dedicatory stanzas inserted into the first three poems in 1709, the revised version of the prose treatise added in 1717 and the apparatus of notes appended in 1736. For, in each of these Pope would appear to be providing his readers with the necessary direction to comprehend precisely what he is endeavouring to accomplish. To study Pope's creation without reference to these and the other factors previously mentioned is to miss much that is of the utmost importance in them. Only through a reconstruction of their evolution can be Pastorals be fully understood and appreciated. </p> / Thesis / Doctor of Philosophy (PhD)

A set of equations describing the motion of a naturally curved and twisted slender elastic rod is determined in this thesis. In particular, a study of the vibration of a helical spring is made, and the natural frequencies from the theory presented are compared with those from a simpler theory. Comparison of the two theories shows that the simpler theory is valid for most springs. The simpler theory is then used to show how the natural frequencies for a helical spring can be obtained when the spring is subjected to any boundary conditions. Finally, an analytical and experimental study of the vibration of a helical spring clamped at both ends is made in order to investigate the validity of the theory presented. / Thesis / Master of Engineering (MEngr)