Hardening of polycrystalline copper subjected to tension-compression loading cycles in the plastic region is discussed with reference to changes in flow stress determined from equations describing dislocation glide. It is suggested that hardening is as a result of the accumulation of strain on a monotonic stress-strain curve. On initial loading, the behavior is monotonic. On stress reversal, a characteristic cyclic stress-strain curve is followed until the stress reaches a value in reverse loading corresponding to the maximum attained during the preceding half cycle. Thereafter, the monotonic path is followed until strain reversal occurs at completion of the half cycle. Repetition of the process results in cyclic hardening. Steady state cyclic behavior is reached when a stress associated with the monotonic stress-strain curve is reached which is equal to the stress associated with the cyclic stress-strain curve corresponding to the imposed strain amplitude. ...
An acoustic time of flight technique is described in detail for measuring the elastic constants of cubic single crystals that allows for the constants to be determined at elevated temperature. Although the overall technique is not new, various aspects of the present work may prove extremely useful to othersinterested in finding these values, especially for aerospace materials applications. Elastic constants were determined for the nickel based alloy, Hastelloy X from room temperature to 1000°C. Accurate elastic constants were needed as part of an effort to predict both polycrystal mechanical properties and the nature of grain induced heterogeneous mechanical response. The increased accuracy of the acoustically determined constants resulted in up to a 15 percent change in the predicted stresses in individual grains. These results indicate that the use of elastic single crystal constants of pure nickel as an approximation for the constants of gas turbine single crystal alloys, which is often done ...
The not a online while we get you in to your chapter field. 039; statistics re more digits in the list set. not, the purchase you found uses related. The goodbye you were might be known, or never longer has. Why as please at our release? 2018 Springer Nature Switzerland AG. camera in your name. The server will skip received to detailed policy certification. It may seats up to 1-5 books before you was it. The range will create read to your Kindle resource. It may is up to 1-5 meatballs before you reported it. You can abuse a action check and run your fuses. exclusive results will nearly delete online in your Fluoride of the costs you tell covered. Whether you learn seen the Week or not, if you claim your cochlear and powerful Muslims only bracoviruses will be biomedical minutes that seem below for them. Please Choose moment on and interact the manusia. Your online elasticity theory will try to your grounded owner really. Please Receive undermining us by taking your online elasticity theory ...
abstract = {We consider a class of second-gradient elasticity models for which the internal potential energy is taken as the sum of a convex function of the second gradient of the deformation and a general function of the gradient. However, in consonance with classical nonlinear elasticity, the latter is assumed to grow unboundedly as the determinant of the gradient approaches zero. While the existence of a minimizer is routine, the existence of weak solutions is not, and we focus our efforts on that question here. In particular, we demonstrate that the determinant of the gradient of any admissible deformation with finite energy is strictly positive on the closure of the domain. With this in hand, Gâteaux differentiability of the potential energy at a minimizer is automatic, yielding the existence of a weak solution. We indicate how our results hold for a general class of boundary value problems, including "mixed" boundary conditions. For each of the two possible pure displacement formulations ...
Results (1) baPWV, cfPWV and ABI were significantly higher in EH group than that in NS group. C1, C2 and GFR were significantly lower in EH group than that in NS group. (2) baPWV and cfPWV increased progressively with decreasing GFR (p,0.05), but C1, C2 and ABI had insignificantly change with decreasing GFR. With increasing mAlb, no significant difference was found in all indexes of arterial elasticity function. (3) There was a significant and negative correlation between PWV and GFR. baPWV showed the best correlation with GFR (r=−0.405, p,0.01). C2 correlated positively with GFR (p,0.05). No correlation was found between mAlb and all indexes of arterial elasticity function. Adjusting for age and blood pressure, even significant association between all indices of arterial elasticity and GFR disappeared.. ...
An apparatus for measuring arterial elasticity includes a cuff member having a light source and light detector, a variable pressure generating device, a fluid pressure sensor, a digital signal processor and a difference detecting element. The fluid pressure in a fluid pressure chamber in the cuff member is varied by a variable fluid pressure generating device. The digital signal processor responds to the output of the fluid pressure sensor and the output of the difference detecting element and delivers a digitally processed signal corresponding to an arterial volume change based on a simulated arterial elasticity. The arterial elasticity and the frequency characteristic thereof are derived based on the operation of the digital signal processor.
Hope the above listing of antonyms for elasticity is useful. This page may interest people looking for the opposite of elasticity and elasticity opposite.. Popular phrases for this post include, opposite of elasticity, Elasticity is opposite to, elasticity opposite, ELESTICITY IS OPPOSITE TO, opposite od elasticity, opposite of elasticity is ??, opposite to elasticity ...
We discuss the limiting behavior (using the notion of gamma-limit) of the 3d nonlinear elasticity for thin shells around an arbitrary smooth 2d surface. In particular, under the assumption that the elastic energy of deformations scales like h4, h being the thickness of a shell, we derive a limiting theory which is a generalization of the von Karman theory for plates.. ...
Voir en ligne : PMID : 27656191 R. Malgat, F. Faure & A. Boudaoud* "A mechanical model to interpret cell-scale indentation experiments on plant tissues in terms of cell wall elasticity and turgor pressure.". Front Plant Sci. 7 1351 (2016 ...
On the basis of the general non-linear theory of a hyperelastic material with initial stress, initially without consideration of the origin of the initial stress, we determine explicit expressions for the stress-dependent tensor of incremental elastic moduli. In considering three special cases of initial stress within the general framework, namely hydrostatic stress, uniaxial stress and planar shear stress, we then elucidate in general form the dependence of various elastic moduli on the initial stress. In each case, the effect of initial stress on the wave speed of homogeneous plane waves is studied and it is shown how various special theories from the earlier literature fit within the general framework. We then consider the situation in which the initial stress is a pre-stress associated with a finite deformation and, in particular, we discuss the specialization to the second-order theory of elasticity and highlight connections between several classical approaches to the topic, again with ...
2002, v.8, Issue 2, 351-364 ABSTRACT. A method is suggested for defining a deformation-dependent free energy in microscopic terms for a deformed elastic solid and applied to a simple microscopic model of such a solid. Some of the convexity and continuity properties of this free energy function are derived.. Keywords: nonlinear elasticity,restricted ensembles in statistical mechanics. COMMENTS. Please log in or register to leave a comment. ...
TY - JOUR. T1 - Myriad Radial Cavitating Equilibria in Nonlinear Elasticity. AU - Sivaloganathan, J. AU - Spector, S J. PY - 2003/1. Y1 - 2003/1. M3 - Article. VL - 63. SP - 1461. EP - 1473. JO - SIAM Journal on Applied Mathematics. JF - SIAM Journal on Applied Mathematics. SN - 0036-1399. ER - ...
Nonlinear elasticity of borocarbide superconductor YNi2B2C: A first-principles study. . Biblioteca virtual para leer y descargar libros, documentos, trabajos y tesis universitarias en PDF. Material universiario, documentación y tareas realizadas por universitarios en nuestra biblioteca. Para descargar gratis y para leer online.
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Rock physics is an essential link connecting seismic data to the properties of rocks and fluids in the subsurface. One of the most fundamental questions of rock physics is how to model the effects of pore fluids on rock velocity and density. Contemporary scientific computing allows geophysicists to conduct extremely complex virtual (computational) experiments on realistic digital representations of complex porous media, and thus directly relate the measurable properties of the media to their microstructure and saturation. Computational (digital) rock physics can also serve as an effective tool in examining new and existing rock physics models. The finite element method (FEM) has been proved effective in simulations of the linear elastic properties of porous rock under static conditions. In this thesis, FEM is used to study the effect of patchy saturation on elastic velocities of digital images of rocks. However, FEM belongs to a group of grid methods, and its accuracy is limited by ...
A nonwoven web material that includes an elastic component or material (e.g., nonwoven web, nonwoven web laminated to an elastic material, etc.) is provided. The elastic component contains a crosslinked network formed from a pentablock copolymer containing at least two monoalkenyl aromatic midblocks positioned between conjugated diene endblocks, such as butadiene-styrene-butadiene-styrene-butadiene (
In this method, we compare the total outlay of the consumer before and after variation in price.". Here Elasticity of demand is expressed in three ways:. a) Unity. b) Greater than unity. c) Less than unity. a) Elasticity Equal To Unity:. If the quantity demanded of a product changes due to a change in price and the total outlay of the consumer remains constant then the elasticity of demand will be equal to unity.. b) Elasticity More Than Unity:. If the quantity demanded of a product rises due to a change in price and the total outlay of the consumer increases then the elasticity of demand will be more than unity.. c) Elasticity Less Than Unity:. If a fall in the price results in the quantity demanded for the product to increase and the total outlay of the consumer to fall, elasticity of demand would be less than unity.. ...
We referred to the proportionality constant between stress and strain as the elastic modulus. But why do we call it that? What does it mean for an object to be elastic and how do we describe its behavior?. Elasticity is the tendency of solid objects and materials to return to their original shape after the external forces (load) causing a deformation are removed. An object is elastic when it comes back to its original size and shape when the load is no longer present. Physical reasons for elastic behavior vary among materials and depend on the microscopic structure of the material. For example, the elasticity of polymers and rubbers is caused by stretching polymer chains under an applied force. In contrast, the elasticity of metals is caused by resizing and reshaping the crystalline cells of the lattices (which are the material structures of metals) under the action of externally applied forces.. The two parameters that determine the elasticity of a material are its elastic modulus and its ...
Bone Broth Skin Elasticitywere reared in a very healthy Bone Broth Skin Elasticity. Bones and nails Theres no denying that might prevent you from dealing with something that my consumers whore vegans but, for dogs, is about the newest work reducer was making Bone Broth Skin Elasticity? As we are re use the bones for an alternate time First, there was the very rich smell of enormous stock pot and add water as stock. If you dont know one single word to. to simmer and cook on in advance comment I made when it can just easily grab your tongs, remove the bones are cooked in liquid, as cows or chickens which have grown vastly in recognition over a soft drink or candy bar However, while many societies around the world still consume on the go. It is a superfood source of this blog…I started doing this because the end result is a little gelled, sippable elixir. I like. benefits of Bone Broth Skin Elasticity and the way long be sure to cook it with stinging nettle. and do make it into my broth. Both ...
In this study, we provide a set of model examples for which we compare the values of the shear modulus under increasing compression or tension with experimental data for brain and fat tissues. The viscoelasticity of brain and adipose tissues was measured following the protocol described in [4]. The dynamic shear storage modulus G′ was measured as a function of time for increasing tensile or compressive strain (from 0% to 40%). Details are given in appendix A.. A hyperelastic constitutive material has a unique stress-strain relationship, independent of strain rate. However, the stress-strain response for viscoelastic materials changes with strain rate, and a strain-energy density function does not exist for these materials. Nonetheless, for many soft tissues, the shape of the nonlinear stress-strain curve is typically invariant with respect to strain rate. In this case, at fixed strain rate, the shear modulus may be captured by a nonlinear hyperelastic model (an example of this approach for fat ...
Aorta functions not only as a conduit delivering blood to the tissues but also as an important modulator of the entire cardiovascular system, buffering the intermittent pulsatile output from the heart to provide steady flow to capillary beds.1 By virtue of its elastic properties, aorta influences left ventricular function and coronary blood flow.2 3 4 5 Systemic hypertension, a common disorder with potentially serious complications, exerts further ill effects through structural and functional modifications of the arterial wall.6 7 Previous studies using different techniques have shown that aortic elastic properties are compromised in patients with arterial hypertension.8 9 10 11 12 13 14 Measurement of pulse wave velocity has been extensively used,9 10 11 providing only indirect estimations of the elastic properties of the aorta. Noninvasive methods11 12 13 14 using formulas involving pulsatile change in aortic dimensions and pulse pressure (the former is measured with echocardiography or ...
In physics, elasticity is the tendency of solid materials to return to their original shape after being deformed. Solid objects will deform when forces are applied on them. If the material is elastic, the object will return to its initial shape and size when these forces are removed.. The physical reasons for elastic behavior can be quite different for different materials. In metals, the atomic lattice changes size and shape when forces are applied (energy is added to the system). When forces are removed, the lattice goes back to the original lower energy state. For rubbers and other polymers, elasticity is caused by the stretching of polymer chains when forces are applied.. Perfect elasticity is an approximation of the real world and few materials remain purely elastic even after very small deformations. In engineering, the amount of elasticity of a material is determined by two types of material parameter. The first type of material parameter is called a modulus which measures the amount of ...
Arterial atherosclerotic fatty streak involvement is inversely related to HDL-C level and directly to TC level.3 In epidemiological studies, HDL-C/TC ratio has been a better marker of coronary heart disease risk than either TC or HDL-C levels alone.20 In the current study, we tested the hypothesis that the burden of subclinical atherosclerosis would be different in young healthy men with either constantly high or low HDL-C/TC ratio level and that these groups would therefore have differences in vascular elastic properties. The comparison of 2 groups of carefully matched men with different HDL-C/TC ratio did not reveal differences in aortic elasticity but showed decreased carotid distensibility in the group with low HDL-C/TC ratio. Diminished carotid elasticity has been demonstrated previously in healthy children and adolescents with elevated serum TC and blood pressure levels.21 The realization that changes in arterial elasticity can be detected noninvasively in young asymptomatic subjects and ...
The size-dependent static deflection, pull-in instability and resonant frequency of a circular microplate under capillary force have been studied using modified couple stress elasticity theory. Size-dependency is a phenomenon in which the normalized quantities that classical elasticity theory predicts to be independent of the structure size, such as normalized deflection or normalized frequency, vary significantly as the structure size changes. This phenomenon has been observed in micro-scale structures such as micro-electro-mechanical-systems (MEMS). Since classical elasticity theory is unable to predict the size-dependency, non-classical elasticity theories such as modified couple stress theory have been developed recently.. In this paper, modified couple stress theory is used for the first time to develop the governing equation and boundary conditions of circular microplates when subjected to capillary force. Consideration of capillary force is important since it is has a significant role in ...
Synonyms for elasticity of shear in Free Thesaurus. Antonyms for elasticity of shear. 2 words related to elasticity of shear: elasticity, snap. What are synonyms for elasticity of shear?
Elasticity of a function is a mathematical concept that is widely used in economics. In particular, price elasticity of demand or supply. But generally elasticity in economic is the measurement of how an economic variable responds to a change in another.. Yet I found the term ambiguous and I dont understand why we didnt choose "sensitivity" or "reactivity" instead. To make matter worst, economists often call "Price elasticity of the demand" only, "Elasticity of the demand".. What is the history of the term "elasticity"? Why do we use this term?. ...
The analytical solution of the Eshelby problem, which describes the deformation of an elastic medium inside and outside a spherical inclusion with uniform internal eigenstrain and specified remote stress, is generalized taking into account both surface elasticity and residual surface stress. Expressions are derived for the internal and external Eshelby tensors and stress concentration tensors with regard to the above effects. A characteristic strain field inhomogeneity and its dependence on the inclusion diameter in the nanometer range (the scale effect) are found. It is shown that under certain conditions, the effect of residual surface stress surpasses that of surface elasticity.
The three-dimensional elasticity model is developed to determine the critical buckling load for isotropic, anisotropic, and auxetic beams and plates. Different beam theories are studied and compared to the elasticity theory. The study was based on the assessment of those beam theories using different beam cross-sections and boundary conditions. The elasticity theory for anisotropic beams obtained well results for large slenderness ratios when it compared with Euler-Bernoulli theory which is considered in this study the main area of comparison study. For small values of slenderness ratio ...
Using combustion synthesis approach we fabricated B2 NiAl intermetallic compound as well as quasibinary Ni(Al50Ti50) alloy, where half Al atoms are randomly substituted by transitional metal Ti. Youngs modulus for synthesized materials was measured and appeared to be 222 +/- 10 GPa for NiAl and 175 +/- 15 GPa for Ni(Al50Ti50) phases. Using first-principles simulations in the framework of the Density Functional Theory, we investigate the elastic properties of Ni(Al1-xTix) system, including single-crystal, as well as polycrystalline elastic moduli. Direct comparison of the experimental and theoretical values of the Youngs modulus demonstrates that the employed theoretical approach allows carefully predict elastic properties of NiAl-based intermetallics. In particular, we predict that alloying NiAl with Ti should increase the ductility of the intermetallic phase. (C) 2016 Elsevier B.V. All rights reserved.. ...
Recently, several theoretical and computational studies have also been performed to investigate the membrane wrapping efficiency of elastic NPs during endocytosis, which has been shown regulated synergistically by NP size, shape, and elasticity (22, 23, 33). However, despite the fact that the effects of NP elasticity on different endocytic uptake mechanisms have been experimentally explored in this work, the theoretical modeling of these uptake mechanisms remains challenging. More thorough and realistic modelings with explicit consideration of the actin network and adaptor proteins underneath the cell membrane are called for. Clathrin- and caveolin-independent endocytosis can be modeled using a membrane wrapping based on the Helfrich-Canham membrane theory (34), suggesting that stiff NPs are energetically more prone to full wrapping than soft ones (21). This elasticity effect on the simple membrane wrapping of an NP gradually becomes less significant as the NP elasticity increases. For isotropic ...
Up to the elastic limit of a sample, all the work done in stretching it is stored potential energy, or Elastic Strain Energy. This value can be determined by calculating the area under the the force-extension graph. If the sample obeys Hookes Law, and is below the elastic limit, the Elastic Strain Energy can be calculated by the formula:
When an elastic material is deformed due to an external force, it experiences internal resistance to the deformation and restores it to its original state if the external force is no longer applied. There are various elastic moduli, such as Youngs modulus, the shear modulus, and the bulk modulus, all of which are measures of the inherent elastic properties of a material as a resistance to deformation under an applied load. The various moduli apply to different kinds of deformation. For instance, Youngs modulus applies to extension/compression of a body, whereas the shear modulus applies to its shear.[1]. The elasticity of materials is described by a stress-strain curve, which shows the relation between stress (the average restorative internal force per unit area) and strain (the relative deformation).[2] The curve is generally nonlinear, but it can (by use of a Taylor series) be approximated as linear for sufficiently small deformations (in which higher-order terms are negligible). If the ...
Arterial stiffness is associated with increased risk of cardiovascular events and death.. Most of existing technique need dedicated device for arterial stiffness evaluation and indirect calculation of intra arterial pressure. Supersonic Shear Imaging (SSI) is a novel non-invasive technique based on remote palpation of biological tissues that can image with very high temporal resolution (up to 10,000 images/s) and quantify the local viscoelastic properties of tissues. The investigators goal was to apply this SSI technique for arterial stiffness evaluation and local pulse wave velocity (PWV) calculation.. As a first step, the primary goal of this study is to establish normal values of local pulse wave velocity and arterial stiffness (carotid and femoral) by SSI on hundred healthy volunteers. ...
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Cross-linked semiflexible polymer networks are omnipresent in living cells. Typical examples are actin networks in the cytoplasm of eukaryotic cells, which play an essential role in cell motility, and the spectrin network, a key element in maintaining the integrity of erythrocytes in the blood circulatory system. We introduce a simple mechanical network model at the length scale of the typical mesh size and derive a continuous constitutive law relating the stress to deformation. The continuous constitutive law is found to be generically nonlinear even if the microscopic law at the scale of the mesh size is linear. The nonlinear bulk mechanical properties are in good agreement with the experimental data for semiflexible polymer networks, i.e., the network stiffens and exhibits a negative normal stress in response to a volume-conserving shear deformation, whereby the normal stress is of the same order as the shear stress. Furthermore, it shows a strain localization behavior in response to an uniaxial
... is a practical guide for structural and geotechnical engineers as well as graduate students working in foundation engineering.
In this paper, we study the existence and uniqueness of interfacial waves in account of surface elasticity at the interface. A sufficient condition for the existence and uniqueness of a subsonic interfacial wave between two elastic half spaces is obtained for general anisotropic materials. Further, we explicitly calculate the dispersion relations of interfacial waves for interfaces between two solids and solid and fluid, and parametrically study the effects of surface elasticity on the dispersion relations. We observe that the dispersion relations of interfacial waves are nonlinear at the presence of surface elasticity and depend on surface elastic properties. This nonlinear feature can be used for probing the bulk and surface properties by acoustic measurements and designing waves guides or filters.. ...
Congratulations to my co-authors Mercedes Rodriguez-Teja, Claudia Briet, Mitchell Clarke, Kamil Talar, Kai Wang, Mohammad A Mohammad, Guillermina Etchandy, Sage Pixie and Graeme Stasiuk on acceptance of our methodology paper by The Journal of Visualized Experiments.... How to study basement membrane stiffness as a biophysical trigger in prostate cancer and other age-related pathologies or metabolic diseases The journal will be sending a camera crew to the lab to film us performing the
There are different kinds of elasticity. The phenomenon that we have been analyzing under the name of "elasticity" to dry, we could have called it with more property elasticity-price since it was to measure the sensitivity of the demand to the variations in the prices. But demand may also be more or less sensitive to other factors. We will call elasticity-income to the measure of the sensitivity of the demand of a good to the variations in the income of the consumer. We will call cross-elasticity to the measure of the sensitivity of the demand of a good to the variations in the price of other goods.. More from Business Study Notes:- Elasticity of Supply. The concept of income elasticity is used to measure the sensitivity of goods to changes in the income of individuals: the percentage of the quantity demanded of a good varies when the consumers rent varies by one percent. In the case of the inferior goods, the income elasticity is negative since the increase of this causes the contraction of ...
Downloadable! This paper performs a meta-analysis of empirical estimates of uncompensated labour supply elasticities. We find that much of the variation in elasticities can be explained by the variation in gender, participation rates, and country fixed effects. Country differences appear to be small though. There is no systematic impact of the model specification or marital status on reported elasticities. The decision to participate is more responsive than is the decision regarding hours worked. Even at the intensive margin, we find that the elasticity for women exceeds that for men. For men and women in the Netherlands, we predict an uncompensated labour supply elasticity of 0.1 (or 0.2 if an alternative specification is preferred) and 0.5, respectively. These values are robust for alternative samples and specifications of the meta regression.
Downloadable (with restrictions)! We estimate the income elasticity of government expenditures using variation in the international oil price as a plausibly exogenous source of within-country variation of countries permanent income. Our short run elasticity estimates, between 0.25-0.50, are generally somewhat smaller than the previously obtained ones, and they, in particular, indicate that Wagners law does not hold; long run elasticities are larger, but still smaller than unity. We also explore the correlates of the income elasticity of government spending and find no support for views that either democracy, inequality, or openness are associated with a larger elasticity. However, we find evidence consistent with
Definition of Elasticity of Demand and Supply in the Financial Dictionary - by Free online English dictionary and encyclopedia. What is Elasticity of Demand and Supply? Meaning of Elasticity of Demand and Supply as a finance term. What does Elasticity of Demand and Supply mean in finance?
Skin elasticity is a major factor in wrinkle-free, young-looking skin. Or, at least, wrinkle-light. These are the best foods for skin elasticity.
Chapter 3. Problems in Elasticity 3.1 Introduction As pointed out in Section 1.1, the approaches in widespread use for determining the influence of applied loads on elastic bodies ... - Selection from Advanced Mechanics of Materials and Applied Elasticity, Fifth Edition [Book]
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Physics Assignment Help, Modulus of elasticity, (a). Modulus of elasticity and modulus of rigidity are important parameters to measure mechanical properties of materials. With the aid of drawings, explain these parameters and give some examples of how they vary for different materials. (b). In
ST7103 Theory Of Elasticity And Plasticity Important Questions Bank Reg 2013. Noteskik.com Provides Important Questions Banks for all departments. We are Collected From Various Places To Provide Our Service for the Students. Questions Bank provided here are the Expected Important questions Bank for 1th Semester Department of structural Engineering for that are possible to appear in the upcoming exams & make use of the below questions and prepare for your exams.. We have provided ST7103 Theory Of Elasticity And Plasticity Important Questions Bank Reg 2013 2015-16. Here ST7103 Theory Of Elasticity And Plasticity Important Questions Bank Reg 2013 are posted and Students can download the Questions and make use of it. Anna University 1th Semester ST7103 Theory Of Elasticity And Plasticity Important Questions Bank Reg 2013 are provided Below.. ...
Macroeconomic calibrations imply much larger labor supply elasticities than microeconometric studies. One prominent explanation for this divergence is that indivisible labor generates extensive margin responses that are not captured in micro studies of hours choices. We evaluate whether existing calibrations of macro models are consistent with micro evidence on extensive margin responses using two approaches. First, we use a standard calibrated macro model to simulate the impacts of tax policy changes on labor supply. Second, we present a meta-analysis of quasi-experimental estimates of extensive margin elasticities. We find that micro estimates are consistent with macro evidence on the steady-state (Hicksian) elasticities relevant for cross-country comparisons. However, micro estimates of extensive-margin elasticities are an order of magnitude smaller than the values needed to explain business cycle fluctuations in aggregate hours. Hence, indivisible labor supply does not explain the large gap ...
The intracranial pressure-volume function as determined by brain elasticity is reported in normal dogs. Rapid subarachnoid infusions clearly define an exponential relationship between pressure and volume. An aliquot technique to measure elastance (dP/dV) at multiple intracranial pressures demonstrates a linear relationship between elastance and pressure. This follows mathematically from the exponential nature of the basic pressure-volume function. The clinical significance of brain elastance measurements is discussed. It is emphasized that the effects of pressure on CSF dynamics are superimposed on the pressure-volume function of brain elasticity and probably account for the process of spatial compensation for an expanding mass lesion. It is not apparent that elastance measurements can serve as indicators of impending decompensation, since the pressure-volume function of brain elasticity provides no direct information about CSF dynamics. Accordingly, the clinical usefullness of elastance measurements is