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1

Fryxell, John M., and Andrew M. Berdahl. "Fitness trade-offs of group formation and movement by Thomson's gazelles in the Serengeti ecosystem." Philosophical Transactions of the Royal Society B: Biological Sciences 373, no. 1746 (March 26, 2018): 20170013. http://dx.doi.org/10.1098/rstb.2017.0013.

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Collective behaviours contributing to patterns of group formation and coordinated movement are common across many ecosystems and taxa. Their ubiquity is presumably due to altering interactions between individuals and their predators, resources and physical environment in ways that enhance individual fitness. On the other hand, fitness costs are also often associated with group formation. Modifications to these interactions have the potential to dramatically impact population-level processes, such as trophic interactions or patterns of space use in relation to abiotic environmental variation. In a wide variety of empirical systems and models, collective behaviour has been shown to enhance access to ephemeral patches of resources, reduce the risk of predation and reduce vulnerability to environmental fluctuation. Evolution of collective behaviour should accordingly depend on the advantages of collective behaviour weighed against the costs experienced at the individual level. As an illustrative case study, we consider the potential trade-offs on Malthusian fitness associated with patterns of group formation and movement by migratory Thomson's gazelles in the Serengeti ecosystem. This article is part of the theme issue ‘Collective movement ecology’.
2

Cavalli, Benedetta. "A probabilistic view on the long-time behaviour of growth-fragmentation semigroups with bounded fragmentation rates." ESAIM: Probability and Statistics 25 (2021): 258–85. http://dx.doi.org/10.1051/ps/2021008.

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The growth-fragmentation equation models systems of particles that grow and reproduce as time passes. An important question concerns the asymptotic behaviour of its solutions. Bertoin and Watson (2018) developed a probabilistic approach relying on the Feynman-Kac formula, that enabled them to answer to this question for sublinear growth rates. This assumption on the growth ensures that microscopic particles remain microscopic. In this work, we go further in the analysis, assuming bounded fragmentations and allowing arbitrarily small particles to reach macroscopic mass in finite time. We establish necessary and sufficient conditions on the coefficients of the equation that ensure Malthusian behaviour with exponential speed of convergence to the asymptotic profile. Furthermore, we provide an explicit expression of the latter.
3

Kashchenko, Ilia, and Sergey Kaschenko. "Infinite Process of Forward and Backward Bifurcations in the Logistic Equation with Two Delays." Nonlinear Phenomena in Complex Systems 22, no. 4 (December 10, 2019): 407–12. http://dx.doi.org/10.33581/1561-4085-2019-22-4-407-412.

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Logistic equation with delay play important role in modelling of various biological processes. In this paper we study the behaviour of solutions of a logistic equation with two delays in a small neighbourhood of equilibrium. The main assumption is that Malthusian coefficient is large, so problem is singular perturbed. To study the local dynamics near points of bifurcation an analogues of normal form was constructed. Its coefficients depends on special bounded discontinues function, which takes all its values infinite number of times when large parameter increases to infinity. It is shown that the system under study has such dynamic effect as infinite process of direct and inverse bifurcations as the small parameter tends to zero.
4

Fazekas, István, and Attila Barta. "A Continuous-Time Network Evolution Model Describing 2- and 3-Interactions." Mathematics 9, no. 23 (December 6, 2021): 3143. http://dx.doi.org/10.3390/math9233143.

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A continuous-time network evolution model is considered. The evolution of the network is based on 2- and 3-interactions. 2-interactions are described by edges, and 3-interactions are described by triangles. The evolution of the edges and triangles is governed by a multi-type continuous-time branching process. The limiting behaviour of the network is studied by mathematical methods. We prove that the number of triangles and edges have the same magnitude on the event of non-extinction, and it is eαt, where α is the Malthusian parameter. The probability of the extinction and the degree process of a fixed vertex are also studied. The results are illustrated by simulations.
5

Sathar, Zeba A., and M. Framurz K. Kiani. "Delayed Marriages in Pakistan." Pakistan Development Review 25, no. 4 (December 1, 1986): 535–52. http://dx.doi.org/10.30541/v25i4pp.535-552.

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Delayed marriages played a very important role in slowing down population growth during the European Demographic Transition. Similarly, some developing countries have recently undergone even more rapid changes in marriage patterns, leading to declining levels of fertility. Curtailing marriage or entry into sexual unions is one of the "positive" checks posited by Malthusian theory and is worthy of some renewed attention because of the lack of decline in marital fertility in Pakistan. Several researchers have identified changes in nuptiality behaviour in Pakistan, in terms of a rise in both the average age at marriage [8; 11; 12] and changes in cohort nuptiality [7]. One researcher observed a slight decline in fertility and attributed it to a rise in the age at marriage in the late Seventies [1], but his observation was found to be an artefact of data and was, therefore, refuted (18] . Thus, nuptiality behaviour has been noted to have changed in Pakistan since the Fifties with no notable accompanying changes in marital fertility. This paper's primary objective is to explore the impact of modernization, particularly of expansion of education and modern sector employment, urbanization and migration, on proportions never married in various age groups.
6

Abia, Luis M., Óscar Angulo, Juan Carlos López-Marcos, and Miguel Ángel López-Marcos. "Computational Study on the Dynamics of a Consumer-Resource Model: The Influence of the Growth Law in the Resource." Mathematics 9, no. 21 (October 29, 2021): 2746. http://dx.doi.org/10.3390/math9212746.

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The dynamics of a specific consumer-resource model for Daphnia magna is studied from a numerical point of view. In this study, Malthusian, chemostatic, and Gompertz growth laws for the evolution of the resource population are considered, and the resulting global dynamics of the model are compared as different parameters involved in the model change. In the case of Gompertz growth law, a new complex dynamic is found as the carrying capacity for the resource population increases. The numerical study is carried out with a second-order scheme that approximates the size-dependent density function for individuals in the consumer population. The numerical method is well adapted to the situation in which the growth rate for the consumer individuals is allowed to change the sign and, therefore, individuals in the consumer population can shrink in size as time evolves. The numerical simulations confirm that the shortage of the resource has, as a biological consequence, the effective shrink in size of individuals of the consumer population. Moreover, the choice of the growth law for the resource population can be selected by how the dynamics of the populations match with the qualitative behaviour of the data.
7

Janson, Svante. "Asymptotics of fluctuations in Crump‒Mode‒Jagers processes: the lattice case." Advances in Applied Probability 50, A (December 2018): 141–71. http://dx.doi.org/10.1017/apr.2018.76.

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Abstract Consider a supercritical Crump‒Jagers process in which all births are at integer times (the lattice case). Let μ̂(z) be the generating function of the intensity of the offspring process, and consider the complex roots of μ̂(z)=1. The root of smallest absolute value is e-α=1∕m, where α>0 is the Malthusian parameter; let γ* be the root of second smallest absolute value. Subject to some technical conditions, the second-order fluctuations of the age distribution exhibit one of three types of behaviour: (i) when γ*>e-α∕2=m-1∕2, they are asymptotically normal; (ii) when γ*=e-α∕2, they are still asymptotically normal, but with a larger variance; and (iii) when γ*<e-α∕2, the fluctuations are in general oscillatory and (degenerate cases excluded) do not converge in distribution. This trichotomy is similar to what has been observed in related situations, such as some other branching processes and for Pólya urns. The results lead to a symbolic calculus describing the limits. The asymptotic results also apply to the total of other (random) characteristics of the population.
8

Reilly, Michael, and Dirk Willenbockel. "Managing uncertainty: a review of food system scenario analysis and modelling." Philosophical Transactions of the Royal Society B: Biological Sciences 365, no. 1554 (September 27, 2010): 3049–63. http://dx.doi.org/10.1098/rstb.2010.0141.

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Complex socio-ecological systems like the food system are unpredictable, especially to long-term horizons such as 2050. In order to manage this uncertainty, scenario analysis has been used in conjunction with food system models to explore plausible future outcomes. Food system scenarios use a diversity of scenario types and modelling approaches determined by the purpose of the exercise and by technical, methodological and epistemological constraints. Our case studies do not suggest Malthusian futures for a projected global population of 9 billion in 2050; but international trade will be a crucial determinant of outcomes; and the concept of sustainability across the dimensions of the food system has been inadequately explored so far. The impact of scenario analysis at a global scale could be strengthened with participatory processes involving key actors at other geographical scales. Food system models are valuable in managing existing knowledge on system behaviour and ensuring the credibility of qualitative stories but they are limited by current datasets for global crop production and trade, land use and hydrology. Climate change is likely to challenge the adaptive capacity of agricultural production and there are important knowledge gaps for modelling research to address.
9

Lee, James, Cameron Campbell, and Wang Feng. "Positive Check or Chinese Checks?" Journal of Asian Studies 61, no. 2 (May 2002): 591–607. http://dx.doi.org/10.2307/2700301.

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As recently as twenty-five years ago, there were virtually no demographers of China and there was little available data on Chinese demographic behavior. Thus in spite of intense interest in China's population dating back at least to Malthus (1766–1834), his initial understanding, or rather misunderstanding, of Chinese population dynamics remains dominant. While recent research on European population history has confirmed Malthus's observations that European, or at least English, population size was controlled largely by the preventive check, nuptiality, the absence of similar studies of Chinese population history ironically facilitated the persistence of a Malthusian hypothesis that Chinese population size was controlled largely by the positive check, mortality. It is a tribute to the elegance and power of the Malthusian orthodoxy that in spite of the lack of information on Chinese historic demographic behavior and economic performance, many of the most distinguished Western scholars of late imperial China continue to interpret social and economic processes in China during the last three hundred years in Malthusian or neo-Malthusian terms (Elvin 1973; Chao 1986; Huang 1990).
10

Bertoin, Jean, and Alexander R. Watson. "The strong Malthusian behavior of growth-fragmentation processes." Annales Henri Lebesgue 3 (August 24, 2020): 795–823. http://dx.doi.org/10.5802/ahl.46.

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11

CÓRDOVA-LEPE, FERNANDO, GONZALO ROBLEDO, and JAVIER CABRERA-VILLEGAS. "POPULATION GROWTH MODELING WITH BOOM AND BUST PATTERNS: THE IMPULSIVE DIFFERENTIAL EQUATION FORMALISM." Journal of Biological Systems 23, supp01 (January 2015): S135—S149. http://dx.doi.org/10.1142/s0218339015400112.

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This note gives an overview on basic mathematical models describing the population dynamics of a single species whose vital dynamics has different time scales. We present five cases combining two time–scales with Malthusian growth in at least one scale. The dynamical behavior shows a progressive complexity, from "naive" to chaotic dynamics (in the Li–Yorke's sense). In addition, some open problems and new results are presented.
12

Jagers, Peter. "Population-size-dependent branching processes." Journal of Applied Mathematics and Stochastic Analysis 9, no. 4 (January 1, 1996): 449–57. http://dx.doi.org/10.1155/s1048953396000391.

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In a recent paper [7] a coupling method was used to show that if population size, or more generally population history, influence upon individual reproduction in growing, branching-style populations disappears after some random time, then the classical Malthusian properties of exponential growth and stabilization of composition persist. While this seems self-evident, as stated, it is interesting that it leads to neat criteria via a direct Borel-Cantelli argument: If m(n) is the expected number of children of an individual in an n-size population and m(n)≥m>1, then essentially ∑n=1∞{m(n)−m}<∞ suffices to guarantee Malthusian behavior with the same parameter as a limiting independent-individual process with expected offspring number m. (For simplicity the criterion is stated for the single-type case here.)However, this is not as strong as the results known for the special cases of Galton-Watson processes [10], Markov branching [13], and a binary splitting tumor model [2], which all require only something like ∑n=1∞{m(n)−m}/n<∞.This note studies such latter criteria more generally. It is dedicated to the memory of Roland L. Dobrushin.
13

Michel, Philippe. "Model of neo-Malthusian population anticipating future changes in resources." Theoretical Population Biology 140 (August 2021): 16–31. http://dx.doi.org/10.1016/j.tpb.2021.03.002.

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14

Hausken, Kjell, and Jack Hirshleifer. "Truthful signalling, the heritability paradox, and the Malthusian equi-marginal principle." Theoretical Population Biology 73, no. 1 (February 2008): 11–23. http://dx.doi.org/10.1016/j.tpb.2007.09.002.

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15

Nekola, Jeffrey C., James H. Brown, Astrid Kodric-Brown, and Jordan G. Okie. "Global sustainability versus the Malthusian–Darwinian dynamic: a reply to Rull." Trends in Ecology & Evolution 28, no. 8 (August 2013): 444. http://dx.doi.org/10.1016/j.tree.2013.05.017.

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16

André, Catherine, and Jean-Philippe Platteau. "Land relations under unbearable stress: Rwanda caught in the Malthusian trap." Journal of Economic Behavior & Organization 34, no. 1 (January 1998): 1–47. http://dx.doi.org/10.1016/s0167-2681(97)00045-0.

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17

Wu, Bin, Chaitanya S. Gokhale, Matthijs Veelen, Long Wang, and Arne Traulsen. "Interpretations arising from Wrightian and Malthusian fitness under strong frequency dependent selection." Ecology and Evolution 3, no. 5 (April 3, 2013): 1276–80. http://dx.doi.org/10.1002/ece3.500.

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18

ZHANG, LAN-WEI, HONG-YING HU, and YAN-ZHOU ZHANG. "Two new species of Coccophagus Westwood (Hymenoptera: Aphelinidae) from China." Zootaxa 5258, no. 3 (March 29, 2023): 342–50. http://dx.doi.org/10.11646/zootaxa.5258.3.7.

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The malthusi group of Coccophagus Westwood (Hymenoptera: Aphelinidae) is characterized by a densely setose mesoscutellum with the posterior apical pair of setae distinctly longer than others. In the present paper, two new species of the malthusi group are described from China: Coccophagus infuscatus sp. nov. and Coccophagus bandus sp. nov., both reared from species of Coccidae (Hemiptera: Sternorrhyncha). The type specimens are housed in Institute of Zoology, Chinese Academy of Sciences (IZCAS), Beijing, China.
19

Watkins, Susan Cotts, and Dennis Hodgson. "Developmental Idealism, the International Population Movement, and the Transformation of Population Ideology in Kenya*." Sociology of Development 5, no. 3 (2019): 229–47. http://dx.doi.org/10.1525/sod.2019.5.3.229.

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The spread of developmental idealism's beliefs about how “modern” family practices help achieve a modern prosperous society did not happen spontaneously, especially in societies whose family systems bore little initial resemblance to the “modern” ideal. We examine how Kenya in the 1960s became the first sub-Saharan country to adopt a fertility reduction policy, even though Kenya's leaders and their Western advisers initially had very different population ideologies. The advisers were neo-Malthusians who viewed continued high fertility in the face of rapid mortality decline as a grave threat to Third World development, whereas most Kenyans were traditional mercantilists who viewed a larger family and a larger population as signs of wealth and prosperity. Kenyans' conversion to neo-Malthusianism is often presented as the simple result of education and reason: Kenyans came to be convinced that progress requires slower population growth and lower fertility, achieved through modern methods of fertility control. Our account differs. It recognizes that neo-Malthusianism was a Western export that faced substantial opposition and that its adoption was the result of a coordinated movement by neo-Malthusians that applied pressure on Kenyan elites to change the intimate behavior of their people. We conclude that developmental idealism has spread from its Western origins to ordinary people around the world, but that the process was not simple, inevitable, or uniform.
20

Delgado-Moran, Juan José, and Fulvia Teano. "The concept of hydrohegemony as a framework for analyzing transborder conflicts over water. Thinking about the Chinese case." Agua y Territorio, no. 14 (December 31, 2019): 97–104. http://dx.doi.org/10.17561/at.14.4437.

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Water is an essential resource, it is at the basis of human civilization and human life, and it also is an important geopolitical factor, in particular in the present worldwide condition of increasing scarcity. Therefore, can transboundary waters at the river basin level, which constitute the majority of freshwater basins, be considered a source that strengthen cooperation among states or a cause of international conflicts? This issue has been largely discussed in the academic literature since the 80s, following the Neo-Malthusian reasoning coupled with a realist approach. However, these arguments merely allow for the depoliticisation of the concept of water security, and do not reflect the realities of water politics. In order to understand states’ hydrobehaviour in transboundary water arrangements at the international level, a framework based on concepts such as hydrohegemony should be adopted to allow for the analysis power asymmetries both at the domestic and international level. To further understand the role that hydrohegemony and power asymmetry play in international water-relations, the case study of China’s hydrobehaviour is taken under analysis, specifically in the region of the Mekong River Basin. China is one of the world’s major raising powers, has exhibited high rates of economic growth, and is heavily dependant on natural resources, and in particular water. As water scarcity is affecting its development, China has shown behaviours pertaining to an ‘hydrohegemon’, making it a particularly interesting case to investigate.
21

Leboutte, René. "Recent Work in Belgian Historical Demography, Nineteenth and Early Twentieth Centuries. Edited by Isabelle Devos and Muriel Neven. Revue Belge d'Histoire Contemporaine / Belgisch Tijdschrift voor Nieuwste Geschiedenis 31, 3–4, Antwerp, 2001. Pp. 311–647. €34." Journal of Economic History 63, no. 1 (March 2003): 258–59. http://dx.doi.org/10.1017/s0022050703281808.

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Ten articles and a rich selective bibliography demonstrate the vitality of Historical Demography research in Belgium. In the introductory article, the editors sum up the main progress of the discipline in Belgium since 1981 and present an updated impressive commented bibliography. Belgian researchers have broken down many stereotypes. For instance, the process of industrialization in mid-nineteenth-century Belgium did not affect the traditional urban network in a spectacular way. Old-established cities and towns like Ghent, Leuven, Verviers, and Charleroi—that receive a special attention in this volume—continued to be important urban centers as they were well before the Industrial Revolution. The stereotype of a massive rural exodus generated by the industrialization is definitively overcome. By adopting a micro-research approach, Katleen Dillen shows that migration was mostly a positive choice and less disruptive than usually considered because it took place in a dense and vivid social network (“From One Textile Centre to Another: Migrations from the District of Ghent to the City of Armentières (France) During the Second Half of the Nineteenth Century,” pp. 431–52). This absence of dramatic change in migration pattern during the industrialization—which is therefore opposite to the situation observed in the Ruhr during the same period—explains why there was no difference in fertility intensity and calendar between migrant people and the sedentary population of the industrial area of Charleroi. Interestingly Flemish migrants to Charleroi adopted the same demographic behavior as the native Walloon people. So, according to Thierry Eggerickx, the main determinant of fertility behavior is the living conditions at the place of arrival rather than the geographical and cultural origin. Eggerickx also emphasizes that the beginning of the demographic transition coincided with the economic crisis of 1873–1892. However, until now the relationship between changes in demographic behavior and economic upheaval remains unclear (“The Fertility Decline in the Industrial Area of Charleroi During the Second Half of the Nineteenth Century”). The social network should probably have played a key role during that period of economic crisis. Indeed, the importance of a dense social network clearly appears as far as the illegitimate fertility in Leuven during the economic crisis of the mid-nineteenth century is concerned. Jan Van Bavel demonstrates that the risks of pregnancy before age 26 and subsequent marriage chances did not result from isolation in town (Leuven), but that sexual activity of unmarried women of courtship age was, on the contrary, a sign of integration within the local community. However what was the role of the economic crisis on the behavior of these women? (“Malthusian Sinners: Illegitimate Fertility and Early Marriage in Times of Economic Crisis: A Case Study in Leuven, 1846–1856”). Leuven's urban society in the nineteenth century is also the place to explore the relation between age homogamy and the increasing importance of romantic love. Bart Van de Putte and Koen Matthijs question Shorter's theory by demonstrating that romantic love did not involve the lower classes. The only clear cultural change in Leuven was the spread of what is today called “a conservative model of marriage life” in which the patriarchal tradition was mixed with new family centered values (“Romantic Love and Marriage. A Study of Age Homogamy in Nineteenth Century Leuven”). This model of marriage behavior seems to correspond to the Catholic Church's doctrine on matrimonial matters. The Belgian Catholic Church managed quite well to adapt itself to social changes of the nineteenth century (Paul Servais, “The Church and the Family in Belgium, 1850–1914”). Mortality has attracted fresh research. Michel Oris and George Alter explore the relationship between migration to the city and mortality pattern. In industrial towns, migration had a positive impact on mortality in the short-term, because the newcomers were healthier than natives of the same age. However, the place of arrival—the new industrial milieu—rapidly affected the children of the migrants who were disproportionately exposed to urban epidemiological conditions. Alter and Oris stress the existence of a "epidemiological depression" between 1846 and 1880, which will need further investigation. Moreover, migration to the industrial cities was at the origin of a specific pattern of mortality: high level of infant and child mortality, lower level of adult mortality (“Paths to the City and Roads to Death: Mortality and Migration in East Belgium During the Industrial Revolution”). The persistent high level of infant mortality at the turn of the twentieth century is confirmed by Marc Debuisson's enquiry covering the whole territory of Belgium (“The Decline of Infant Mortality in the Belgian Districts at the Turn of the Twentieth Century”), meanwhile Jeroen Backs observes an increasing discrepancy between upper classes and poor people in front of death. The inequality results from a growing infant and child mortality (“Mortality in Ghent, 1850–1950: A Social Analysis of Death”).
22

Ivanov, Sergey. "Determinants and Consequences of Population Trends in Sub-Saharan Africa." Journal of the Institute for African Studies, December 1, 2020, 55–76. http://dx.doi.org/10.31132/2412-5717-2020-53-4-55-76.

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During the universal demographic transition, the traditional type of population reproduction, characterized by high mortality and high fertility, is transformed into a type of reproduction in which both components are at a low level. The demographic transition is not taking place in a social vacuum, but under the influence of many social factors, including the growth of education and economic development. Reducing child mortality is a sine qua non for changing reproductive behavior. Declines in mortality and fertility are usually separated by long periods when population growth is accelerating. The population explosion is fading away in most countries of Asia and Latin America because they have passed the main part of the demographic transition. In Africa, the decline in child mortality began later and is still in the incipient phase. As a result, fertility, although declining in recent decades in most countries, is declining slowly and remains high. The region as a whole is in the early stage of the demographic transition: the population is growing rapidly and it is not expected to stabilize until the end of the century. Most of the economic and social consequences of rapid population growth are negative. Their conceptualization takes place within the framework of the neo-Malthusian paradigm, which made it possible to substantiate demographic policy based on family planning programs that have proven their effectiveness in different regions of the world. The negative, and sometimes disastrous, consequences of rapid population growth are particularly pronounced in Africa. Anti-Malthusianism is less inclined towards scientific argumentation, and its main goal is not pragmatic solutions to problems, but ideological proclamations, although some anti-Malthusian concepts have positive potential. The concept of the demographic dividend, developed in recent decades, makes it possible to remove the contradictions between two opposing paradigms, since it shifts the emphasis from the negative consequences of rapid population growth to the positive consequences of changes in the population age structure during the demographic transition. The demographic transition in Africa needs to be accelerated, and policies are able to do this without relying on the impractical assumptions of fast economic growth. Three interrelated factors are critical: development of education, radical reduction in child mortality and strengthening of family planning programs.
23

Afanasenko, Yana A., and Tatyana G. Chernova. "Expanding Human Rights and Freedoms or Its Dehumanization?" Общество: философия, история, культура, no. 5 (May 22, 2024). http://dx.doi.org/10.24158/fik.2024.5.7.

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The article delves into the analysis of the “8 March Principles” presented by the International Commission of Jurists together with UNAIDS and the Office of the United Nations High Commissioner for Human Rights as a set of legal principles that decriminalize behavior in the field of sex, drug use, HIV, sexual and reproductive health, homelessness and poverty. Utilizing ostensibly civilized forms, these principles serve the Malthusian idea of population reduction (“corruption clothed in legal forms”, Malthus’s term), with law being no exception. However, while in traditional contexts, “dissolute living” (Malthus’s term) like marriage, contributes to population growth, emphasizing the need for chastity among the lower classes, neo-Malthusianism normalizes debauchery, indeed leading to population reduction. The aim of this article is to identify the dehumanizing content, reducing humans from social subjects to biological objects. The study’s subject encompasses dehumanizing conditions reflected in the “March 8 Principles” including the destruction of family, cultural, familial-role, gender, and sexual identities; legalization of drugs and pedophilia, prostitution, and begging as forms of commercial activity; as well as the destruction of culture. The methodological basis of this research is dialectical materialism. In scrutinizing the “March 8 Principles”, this study highlights the dichotomy between the purported expansion of human rights and the underlying trend towards dehumanization. By elucidating how these principles relegate individuals from social subjects to biological one, the research underscores the erosion of fundamental societal structures and cultural values. As such, it prompts critical reflection on the broader implications of legal frameworks ostensibly designed to promote human rights. Through the lens of dialectical materialism, this analysis provides valuable insights into the complexities of modern legal and socio-cultural dynamics, inviting further scholarly inquiry into the intersection of law, morality, and human dignity.

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