scholarly journals Ideal and Technical Filters

2021 ◽  
pp. 75-99
Author(s):  
Melle Jan Kromhout

Chapter 3 shows how the logic of noise reduction is anchored in historical discourses on sound and technology, taking a closer look at the development, from the early nineteenth century onward, of some of the most important concepts in physical acoustics and sound engineering. First, it discusses two uncertainty principles fundamental to information theory and communication engineering, which entail compromises that limit the accuracy of any reproduction. Second, it focuses on the mathematical principles of Fourier analysis, which gave rise to the now-familiar representation of sound in terms of a “spectrum” of singular frequencies or “sine waves.” The chapter thereby explores the difference between a timeless, mathematical plane of the ideal filter in which clear, noiseless reproduction always seems possible, and a physical domain of technical filters in which transience and noise haunt every transmission. The contrast between the two, in turn, highlights the important relation between noise and time.

1987 ◽  
Vol 24 (12) ◽  
pp. 2392-2395 ◽  
Author(s):  
M. J. Aitken ◽  
A. L. Allsop ◽  
G. D. Bussell ◽  
M. Winter

Evaluation of the ancient geomagnetic field at the time that this kiln last cooled down, around A.D. 1840, has been made by means of the Thellier technique applied to bricks from the floor. The value obtained, 56 ± 1 μT, is significantly lower than the value expected from contemporary observatory measurements, 64 μT. The difference is consistent with the demagnetizing field expected from the rather strong magnetization of the baked clay.


Lituanistica ◽  
2020 ◽  
Vol 66 (1) ◽  
Author(s):  
Laurynas Giedrimas

The article deals with the households of the nobles and peasants in the first half of the nineteenth century in Užventis parish, Samogitia. In the middle of the twentieth century, John Hajnal and Peter Laslett started researching the history of resident households. The researchers formulated theoretical and methodological foundations for household analysis and encouraged other historians and demographers to undertake similar studies. The researchers who analysed the households of Central and Eastern Europe either refuted or corrected many of the statements proposed by John Hajnal and Peter Laslett and established that the most common household in Central and Eastern Europe was a nuclear household, although in many cases it was also possible to find an extended household. However, it was not clarified at what age people started building new households and which household model dominated in Samogitia. Also, it was not known what the difference between a household of nobles and a household of peasants was. The data on the households of the nobles and peasants also interconnected. The households of landlords were bigger than the households of peasants and the petty nobility, because the menage of a landlord used to be part of the household. After analysing the aforementioned data, it has been discovered that in the first half of the nineteenth century, nuclear household dominated Užventis parish. Extended household models were often found as well. The Catholic inhabitants of Užventis parish married late and had a child every two years. Around 3500 Catholic residents lived in Užventis parish in the first half of the nineteenth century. The analysis of the data showed that nuclear household dominated the Užventis parish in the first half of the nineteenth century.


2021 ◽  
Vol 5 (3/4) ◽  
pp. 311-327
Author(s):  
Maarten Meijer

Abstract Charles Liernur’s Pneumatic Sewage System and the Governing of Soils This article interrogates the epistemological conditions of Charles Liernur’s pneumatic sewage system in order to shed light on the changing relation between soils and Dutch society in the nineteenth century. The first section discusses the relation between hygienism, soil and sewage. The second section unearths how Liernur’s design related to the agricultural chemistry of Justus Liebig. Through the epistemologies and the mediating technologies that are operationalized by hygienists and chemists, soils are made governable. The final section of this article discusses the struggle to commercialise the urban waste collected by Liernur’s system, highlighting the difference between governable and governed soils.


2019 ◽  
pp. 156-184
Author(s):  
Joan Wallach Scott

This chapter explores the complex uses of feminism and appeals to “sexual democracy” in the new discourse of secularism. The story is anything but straightforward and involves the insistence on sex as a public matter, and on women's sexuality (and by extension, nonnormative sexualities) as a right of individual self-determination. The emphasis on individualism is a part of neoliberalism's “rationality;” it is not the same as its nineteenth-century antecedent. At the same time, the difference of sex and its heteronormative claims has not disappeared, confusing woman's status as a desiring subject with her status as an object of (male) desire. The contemporary discourse of secularism, with its insistence on the importance of “uncovered” women's bodies equates public visibility with emancipation, as if that visibility were the only way to confirm women as sexually autonomous beings (exercising the same rights in this domain as men). The contrast with “covered” Muslim women not only perpetuates the confusion between Western women as subjects and objects of desire, it also distracts attention from (or flatly ignores) persisting racialized gender inequalities in markets, politics, jobs, and law within each side.


2021 ◽  
Vol 263 (1) ◽  
pp. 5327-5334
Author(s):  
SK Tang ◽  
Rudolf YC Lee

A new device called 'enhanced acoustic balcony' is installed in a new housing estate in Hong Kong. It is intended to help reduce the impact of traffic noise on the residents. This balcony is basically an enlarged form of a plenum window and with three openings. Apart from the outdoor air inlet, there is the balcony door and a side-hung window on the interior balcony wall for natural ventilation of the indoor space. Sound absorption of NRC 0.7 is installed on the balcony ceiling and its sidewall facing the incoming traffic noise and an inclined panel is installed outside the balcony to provide noise screening. A site measurement of its noise reduction is carried out in the present study in a newly completed housing block. A 28 m long loudspeaker array is used as the sound source. The indoor noise levels are measured according to ISO standard. The results show that the difference between indoor and outdoor noise levels in the presence of this balcony form varies over a relatively narrow range between 10 to 13 dBA for an elevation angle from 25 to 60 deg. There is a weak increase of the noise level difference with elevation angle.


Author(s):  
Ann Goldberg

Distinctions between delinquency and illness were ill-defined and problematic, as we have seen in the case of the masturbator Johann A. And it was precisely in this vague grey zone between the two that psychiatry was able to insert itself in defining a new mental pathology. The problem of deciphering the difference between delinquency/criminality and madness was further complicated and given a unique twist in the cases of Jewish patients, whose Jewishness (in the eyes of the asylum) was by definition a kind of criminality and immorality. Jewishness, in other words, represented a category of interpretation distinct from illness, one which, in turn, had become highly politicized in the debates about Jewish emancipation since the eighteenth century. Therefore, when race was used to interpret patient behavior, it constituted a form of thinking outside of the medical domain in the strictest sense. In this way, it was potentially at odds with the medical process, and could, as I will show in two case studies, function to prevent the asylum staff from seeing and treating patients as ill. This chapter thus examines the limits of the medicalization of deviancy— the points where, in contrast to the “illnesses” discussed heretofore (male masturbation, nymphomania, and religious madness), medicine pulled back, seeking explanations for the person in a framework outside of the terms of medicine. That extramedical framework drew from long-standing stereotypes of Jews as immoral and criminal; but it also had a more immediate source in a contemporary trope that united Jewishness and criminality in a social type: the jüdischer Gauner (Jewish crook). Such images of Jews had in turn become part of the political arsenal of those opposing Jewish emancipation on the grounds of an incorrigible Jewish “character.” My argument here runs counter to the few historical works on Jews and insanity, which, consistent with the medicalization thesis, have focused exclusively on the conflation of Jewishness and illness in medical theories. In part, this approach derives from their focus on the second half of the nineteenth century, where the conflation was indeed overwhelming, psychiatry and medicine (as well as other human sciences) having become saturated with racial and degeneration theories.


Entropy ◽  
2018 ◽  
Vol 20 (12) ◽  
pp. 959 ◽  
Author(s):  
Mateu Sbert ◽  
Min Chen ◽  
Jordi Poch ◽  
Anton Bardera

Cross entropy and Kullback–Leibler (K-L) divergence are fundamental quantities of information theory, and they are widely used in many fields. Since cross entropy is the negated logarithm of likelihood, minimizing cross entropy is equivalent to maximizing likelihood, and thus, cross entropy is applied for optimization in machine learning. K-L divergence also stands independently as a commonly used metric for measuring the difference between two distributions. In this paper, we introduce new inequalities regarding cross entropy and K-L divergence by using the fact that cross entropy is the negated logarithm of the weighted geometric mean. We first apply the well-known rearrangement inequality, followed by a recent theorem on weighted Kolmogorov means, and, finally, we introduce a new theorem that directly applies to inequalities between K-L divergences. To illustrate our results, we show numerical examples of distributions.


1931 ◽  
Vol 25 (1) ◽  
pp. 12-22 ◽  
Author(s):  
W.H. Shewring

The theory of the comparative method has been discussed in a previous article. I pass on to the results obtained—the actual history of prose-rhythm in the practice of particular authors. I give below the figures of normal frequency on which my statements are based. For Greek prose, as I have already said, Thucydides may be considered a practically unmetrical author, since nearly all his clausulae occur with about the same frequency as might be expected from the natural proportion of long and short syllables in the Greek language, and since there is little difference between his sentence-metre and his clausula-metre. (A slight difference between the two is natural, because there are some words, such as the article, which can scarcely be used to close a sentence.) Thus the theoretical frequency of — ∪ — is 14·19 per cent.; its frequency in Thucydides' clausula-metre is 14·2, in his sentence-metre 14·4. But there are two cases where the difference in these proportions seems too great to be due altogether to chance. Compared with the theoretical calculation and with the sentence-metre, —∪∪—— occurs in the clausula considerably more frequently (6·1 per cent, as against 2·6 per cent.) and —∪—∪ considerably less (3·7 per cent, as against 5·1 per cent.). The first form seems to be sought by Thucydides; the second seems to be avoided (doubtless as suggesting an iambic trimeter ending). For these two forms, therefore, I have considered as normal the average percentages of 2,000 cases in the sentence-metre of Thucydides and Xenophon (1,000 each), for the rest the percentages of 2,000 cases in the clausula-metre of Thucydides. For normal frequency in Latin metrical prose I have used de Groot's figures, based on 2,000 cases from nineteenth-century Latin translations of Gregory and Athanasius.


2008 ◽  
Vol 9 (2) ◽  
pp. 288-314
Author(s):  
Hélène Margerie

This paper discusses the historical evolution of fairly as a compromiser. Rather, which had already developed into a compromiser by the time fairly started going down the same cline, provides the background for the study of the grammaticalisation of fairly. Based on electronic corpora, the distinctive collexeme analysis I propose (Stefanowitch and Gries 2003) focuses on the collocational preferences exhibited by the two compromisers when combining with an adjective, from the origins of fairly as a compromiser in the early nineteenth century to the present day. The difference in the polarity of the adjectives they modify indicates their complementary distribution. Finally the semantic origin of the two forms provides some insights into the specificities they developed as moderators, showing signs of persistence, as defined in the framework of grammaticalisation, and of subjectification (Traugott 1988, 1995).


1999 ◽  
Vol 58 (2) ◽  
pp. 366-398 ◽  
Author(s):  
Jean Howell

A system of registration of title to land was first introduced int England by the Land Transfer Act 1862. Many commentators have since charted its development and have described the struggle between those espousing title registration and those advocating a reformed system of unregistered conveyancing. There has, however, been little discussion of an alternative which was strongly advocated in the nineteenth century; a general register of deeds, rather than title. The article explains the difference between the two systems and describes the various proposals for the establishment of a deeds register. It then analyses the relative strengths and weaknesses of the two systems of registration and suggests that the eventual ascendancy of title registration was due less to any inherent superiority than to external factors.


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