scholarly journals Quinn’s Law of Fluid Dynamics Pressure-Driven Fluid Flow through Closed Conduits

2019 ◽  
Author(s):  
Hubert M Quinn
Keyword(s):  
Pressure Gradient ◽  
Linear Relationship ◽  
First Principles ◽  
Driving Force ◽  
Unique Minimum ◽  
Classical Studies ◽  
Flow Through ◽  
The Law ◽  
Solid Obstacles ◽  
The Relationship

In this paper we develop from first principles a unique law pertaining to the flow of fluids through closed conduits. This law, which we call “Quinn’s Law”, may be described as follows: When fluids are forced to flow through closed conduits under the driving force of a pressure gradient, there is a linear relationship between the normalized dimensionless pressure gradient, PQ, and the normalized dimensionless fluid current, CQ. The relationship is expressed mathematically as: PQ = k1 +k2CQ. This linear relationship remains the same whether the conduit is filled with or devoid of solid obstacles. The law differentiates, however, between a packed and an empty conduit by virtue of the tortuosity of the fluid path, which is seamlessly accommodated within the normalization framework of the law itself. When movement of the fluid is very close to being at rest, i.e., very slow, this relationship has the unique minimum constant value of k1, and as the fluid acceleration increases, it varies with a slope of k2 as a function of normalized fluid current. Quinn’s Law is validated herein by applying it to the data from published classical studies of measured permeability in both packed and empty conduits, as well as to the data generated by home grown experiments performed in the author’s own laboratory.

Oxygen Consumption and Gill Water Flow in the Dogfish Scyliorhinus Canicula L

1968 ◽  
Vol 49 (3) ◽  
pp. 557-564 ◽  
Author(s):  
G. M. HUGHES ◽  
SHUN-ICHI UMEZAWA
Keyword(s):  
Oxygen Consumption ◽  
Hydrostatic Pressure ◽  
Pressure Gradient ◽  
Linear Relationship ◽  
Water Flow ◽  
Marked Change ◽  
Respiratory Frequency ◽  
Flow Rates ◽  
Scyliorhinus Canicula ◽  
The Relationship

1. Determinations of the standard oxygen consumption of the dogfish Scyliorhinus canicula, by several different methods, gave values in the range of 20-55 c.c./kg./hr. at 12°C. 2. When the rate of water flow over the resting fish is increased, there is an increase in oxygen consumption, but no marked change in respiratory frequency at the flow rates studied. An increase of respiratory frequency took place when the PO2 of the inspired water was reduced. 3. The ventilation volume of the dogfish was measured by collecting the water in chambers after it had passed over the gills. The resting ventilation volume was about 120 c.c./min./kg. at 12° C. 4. The relationship between the flow across the gills and the imposed hydrostatic pressure gradient (Δp) showed a linear relationship. The fish was unable to continue pumping water across the gills against adverse gradients in excess of 0.7 cm. H2O. 5. When the flow across the gills was relatively low, utilization of oxygen of at least 70% was observed, but with increasing flow rates this fell to between 40 and 50%.

Analysis of magnetic force and dynamic characteristic for non-contact permanent magnet linear drive device

2020 ◽  
Vol 64 (1-4) ◽  
pp. 1337-1345
Author(s):  
Chuan Zhao ◽  
Feng Sun ◽  
Junjie Jin ◽  
Mingwei Bo ◽  
Fangchao Xu ◽  
...  
Keyword(s):  
Finite Element ◽  
Permanent Magnet ◽  
Dynamic Characteristic ◽  
Driving Force ◽  
Magnetic Circuit ◽  
Response Speed ◽  
Computation Method ◽  
Element Analysis ◽  
Element Simulation ◽  
The Relationship

This paper proposes a computation method using the equivalent magnetic circuit to analyze the driving force for the non-contact permanent magnet linear drive system. In this device, the magnetic driving force is related to the rotation angle of driving wheels. The relationship is verified by finite element analysis and measuring experiments. The result of finite element simulation is in good agreement with the model established by the equivalent magnetic circuit. Then experiments of displacement control are carried out to test the dynamic characteristic of this system. The controller of the system adopts the combination control of displacement and angle. The results indicate that the system has good performance in steady-state error and response speed, while the maximum overshoot needs to be reduced.

A Comparative Overview of the Fair Wear and Tear Exception: the Duty of Holders of Temporary Interests to Preserve Property

2002 ◽  
Vol 6 (1) ◽  
pp. 85-100
Author(s):  
Raffaele Caterina
Keyword(s):  
Common Core ◽  
Complete Solution ◽  
Roman Law ◽  
Private Ownership ◽  
Legal Systems ◽  
Personal Rights ◽  
Wear And Tear ◽  
Long Life ◽  
The Law ◽  
The Relationship

“A system of private ownership must provide for something more sophisticated than absolute ownership of the property by one person. A property owner needs to be able to do more than own it during his lifetime and pass it on to someone else on his death.”1 Those who own things with a long life quite naturally feel the urge to deal in segments of time. Most of the owner's ambitions in respect of time can be met by the law of contract. But contract does not offer a complete solution, since contracts create only personal rights. Certain of the owner's legitimate wishes can be achieved only if the law allows them to be given effect in rem—that is, as proprietary rights. Legal systems have responded differently to the need for proprietary rights limited in time. Roman law created usufruct and other iura in re aliena; English law created different legal estates. Every system has faced similar problems. One issue has been the extent to which the holder of a limited interest should be restricted in his or her use and enjoyment in order to protect the holders of other interests in the same thing. A common core of principles regulates the relationship between those who hold temporary interests and the reversioners. For instance, every system forbids holder of the possessory interest to damage the thing arbitrarily. But other rules are more controversial. This study focuses upon the rules which do not forbid, but compel, certain courses of action.

Parliamentarism and the Legislative Branch

2017 ◽  
Author(s):  
András Sajó ◽  
Renáta Uitz
Keyword(s):  
Decision Making ◽  
Political Parties ◽  
Legislative Branch ◽  
Effective Decision ◽  
The Law ◽  
Internal Operations ◽  
Effective Decision Making ◽  
The Relationship ◽  
Law Making

This chapter examines the relationship between parliamentarism and the legislative branch. It explores the evolution of the legislative branch, leading to disillusionment with the rationalized law-making factory, a venture run by political parties beyond the reach of constitutional rules. The rise of democratically bred party rule is positioned between the forces favouring free debate versus effective decision-making in the legislature. The chapter analyses the institutional make-up and internal operations of the legislature, the role of the opposition in the legislative assembly, and explores the benefits of bicameralism for boosting the powers of the legislative branch. Finally, it looks at the law-making process and its outsourcing via delegating legislative powers to the executive.

The Obligation to Afford Reparation to Injured Individuals

2017 ◽  
Author(s):  
Carla Ferstman
Keyword(s):  
Human Rights ◽  
International Law ◽  
International Organizations ◽  
International Humanitarian Law ◽  
Humanitarian Law ◽  
Human Rights Treaties ◽  
The Law ◽  
The Right ◽  
Right Of Access ◽  
The Relationship

This chapter considers the consequences of breaches of human rights and international humanitarian law for the responsible international organizations. It concentrates on the obligations owed to injured individuals. The obligation to make reparation arises automatically from a finding of responsibility and is an obligation of result. I analyse who has this obligation, to whom it is owed, and what it entails. I also consider the right of individuals to procedures by which they may vindicate their right to a remedy and the right of access to a court that may be implied from certain human rights treaties. In tandem, I consider the relationship between those obligations and individuals’ rights under international law. An overarching issue is how the law of responsibility intersects with the specialized regimes of human rights and international humanitarian law and particularly, their application to individuals.

Property in Human Body Parts

2020 ◽  
Author(s):  
Justine Pila
Keyword(s):  
Intellectual Property ◽  
Property Rights ◽  
Human Body ◽  
First Principles ◽  
The Political ◽  
Body Parts ◽  
Cautionary Tale ◽  
Regulatory Approach ◽  
Legal Position ◽  
The Law

This chapter surveys the current legal position concerning property in bodies and bodily materials. Of especial relevance in the current age of advanced genetic and other bio technologies, it looks beyond property in bodies and their materials ‘as such’ to consider also (a) the availability of rights of personal and intellectual property in objects incorporating or derived from them, and (b) the reliance on quasi-property rights of possession and consent to regulate the storage and use of corpses and detached bodily materials, including so-called ‘bio-specimens’. Reasoning from first principles, it highlights the practical and conceptual, as well as the political and philosophical, difficulties in this area, along with certain differences in the regulatory approach of European and US authorities. By way of conclusion, it proposes the law of authors’ and inventors’ rights as simultaneously offering a cautionary tale to those who would extend the reach of property even further than it extends currently and ideas for exploiting the malleability of the ‘property’ concept to manage the risks of extending it.

Industrial districts and local governance in the Italian experience

1999 ◽  
Vol 18 (2) ◽  
pp. 131-139
Author(s):  
Maurizio Mistri
Keyword(s):  
Political Behavior ◽  
Political Attitudes ◽  
Local Governance ◽  
Dynamic Processes ◽  
Industrial Districts ◽  
Small Enterprises ◽  
Local Growth ◽  
Italian Experience ◽  
The Law ◽  
The Relationship

This paper focuses on the problem of the governance of industrial districts in Italy. The analysis begins with an assessment of the dynamic processes that characterize the development of industrial districts, particularly as concerns the elements of a cultural nature. The relationship between local political attitudes and forms of local growth is considered, generally revealing how in the various practical examples there is a convergence between models of political behavior and the needs of the system of small enterprises. The paper ends with a brief discussion of the law 317/91, designed to establish the responsibilities and roles of the industrial districts.

scholarly journals The Principle of Directive-Compliant Development of the Law and the Contra Legem Limit

2020 ◽  
Vol 16 (4) ◽  
pp. 465-488
Author(s):  
Thomas M.J. Möllers
Keyword(s):  
Case Law ◽  
Third Party ◽  
Broad Term ◽  
Legal Texts ◽  
Classical Methodology ◽  
The Law ◽  
Legal Methodology ◽  
The Relationship ◽  
Further Development ◽  
Domestic Law

AbstractThe Europeanisation of domestic law calls for a classical methodology to ‘update’ the established traditions of the law. The relationship between European directives and national law is difficult, since directives do apply, but European legal texts need to be implemented into national law. Whilst directives are not binding on private individuals, there is no direct third-party effect, but only an ‘indirect effect’. This effect is influenced by the stipulations of the ECJ, but is ultimately determined in accordance with methodical principles of national law. The ECJ uses a broad term of interpretation of the law. In contrast, in German and Austrian legal methodology the wording of a provision defines the dividing line between interpretation and further development of the law. The article reveals how legal scholars and the case-law have gradually shown in recent decades a greater willingness to shift from a narrow, traditional boundary of permissible development of the law to a modern line of case-law regarding the boundary of directive-compliant, permissible development of the law.

scholarly journals Rectal–vaginal pressure gradient in patients with pelvic organ prolapse and symptomatic rectocele

2021 ◽  
Vol 21 (1) ◽  
Author(s):  
Cheng Tan ◽  
Man Tan ◽  
Jing Geng ◽  
Jun Tang ◽  
Xin Yang
Keyword(s):  
Pelvic Organ Prolapse ◽  
Pressure Gradient ◽  
Obstructed Defecation ◽  
Elevated Pressure ◽  
Pelvic Organ ◽  
Lower Grade ◽  
Translabial Ultrasound ◽  
Rectal Ampulla ◽  
The Relationship ◽  
Posterior Vaginal Prolapse

Abstract Objective The aim of this study is to examine the relationship between rectal–vaginal pressure and symptomatic rectocele in patients with pelvic organ prolapse (POP). Method Patients with posterior vaginal prolapse staged III or IV in accordance with the POP Quantitation classification method who were scheduled for pelvic floor reconstructive surgery in the years 2016–2019 were included in the study. Rectocele was diagnosed using translabial ultrasound, and obstructed defecation (OD) was diagnosed in accordance with the Roma IV diagnostic criteria. Both rectal and vaginal pressure were measured using peritron manometers at maximum Vasalva. To ensure stability, the test was performed three times with each patient. Results A total of 217 patients were enrolled in this study. True rectocele was diagnosed in 68 patients at a main rectal ampulla depth of 19 mm. Furthermore, 36 patients were diagnosed with OD. Symptomatic rectocele was significantly associated with older age (p < 0.01), a higher OD symptom score (p < 0.001), and a lower grade of apical prolapse (p < 0.001). The rectal–vaginal pressure gradient was higher in patients with symptomatic rectocele (37.4 ± 11.7 cm H2O) compared with patients with asymptomatic rectocele (16.9 ± 8.4 cm H2O, p < 0.001), and patients without rectocele (17.1 ± 9.2 cm H2O, p < 0.001). Conclusion The rectal–vaginal pressure gradient was found to be a risk factor for symptomatic rectocele in patients with POP. A rectal–vaginal pressure gradient of > 27.5 cm H2O was suggested as the cut-off point of the elevated pressure gradient.

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