A new method to measure Bowen ratios using high-resolution vertical dry and wet bulb temperature profiles

The Bowen ratio surface energy balance method is a relatively simple method to determine the latent heat flux and the actual land surface evaporation. The Bowen ratio method is based on the measurement of air temperature and vapour pressure gradients. If these measurements are performed at only two heights, correctness of data becomes critical. In this paper we present the concept of a new measurement method to estimate the Bowen ratio based on vertical dry and wet bulb temperature profiles with high spatial resolution. A short field experiment with distributed temperature sensing (DTS) in a fibre optic cable with 13 measurement points in the vertical was undertaken. A dry and a wetted section of a fibre optic cable were suspended on a 6 m high tower installed over a sugar beet trial plot near Pietermaritzburg (South Africa). Using the DTS cable as a psychrometer, a near continuous observation of vapour pressure and air temperature at 0.20 m intervals was established. These data allowed the computation of the Bowen ratio with a high spatial and temporal precision. The daytime latent and sensible heat fluxes were estimated by combining the Bowen ratio values from the DTS-based system with independent measurements of net radiation and soil heat flux. The sensible heat flux, which is the relevant term to evaluate, derived from the DTS-based Bowen ratio (BR-DTS) was compared with that derived from co-located eddy covariance (<i>R</i>² = 0.91), surface layer scintillometer (<i>R</i>² = 0.81) and surface renewal (<i>R</i>² = 0.86) systems. By using multiple measurement points instead of two, more confidence in the derived Bowen ratio values is obtained

An axiomatic approach to the non-linear theory of generalized functions and consistency of Laplace transforms

We offer an axiomatic definition of a differential algebra of generalized functions over an algebraically closed non-Archimedean field. This algebra is of Colombeau type in the sense that it contains a copy of the space of Schwartz distributions. We study the uniqueness of the objects we define and the consistency of our axioms. Next, we identify an inconsistency in the conventional Laplace transform theory. As an application we offer a free of contradictions alternative in the framework of our algebra of generalized functions. The article is aimed at mathematicians, physicists and engineers who are interested in the non-linear theory of generalized functions, but who are not necessarily familiar with the original Colombeau theory. We assume, however, some basic familiarity with the Schwartz theory of distributions.Comment: 23 page

Leibnizian, Robinsonian, and Boolean Valued Monads

This is an overview of the present-day versions of monadology with some applications to vector lattices and linear inequalities.Comment: This is a talk prepared for the 20th St. Petersburg Summer Meeting in Mathematical Analysis, June 24-29, 201

A distributed stream temperature model using high resolution temperature observations

International audienceDistributed temperature data are used as input and as calibration data for an energy based temperature model of a first order stream in Luxembourg. A DTS (Distributed Temperature Sensing) system with a fiber optic cable of 1500 m was used to measure stream water temperature with 1 m resolution each 2 min. Four groundwater inflows were identified and quantified (both temperature and relative discharge). The temperature model calculates the total energy balance including solar radiation (with shading effects), longwave radiation, latent heat, sensible heat and river bed conduction. The simulated temperature is compared with the observed temperature at all points along the stream. Knowledge of the lateral inflow appears to be crucial to simulate the temperature distribution and conversely, that stream temperature can be used successfully to identify sources of lateral inflow. The DTS fiber optic is an excellent tool to provide this knowledge

A tale of two capitalisms: preliminary spatial and historical comparisons of homicide rates in Western Europe and the USA

This article examines comparative homicide rates in the United States and Western Europe in an era of increasingly globalized neoliberal economics. The main finding of this preliminary analysis is that historical and spatial correlations between distinct forms of political economy and homicide rates are consistent enough to suggest that social democratic regimes are more successful at fostering the socio-cultural conditions necessary for reduced homicide rates. Thus Western Europe and all continents and nations should approach the importation of American neo-liberal economic policies with extreme caution. The article concludes by suggesting that the indirect but crucial causal connection between political economy and homicide rates, prematurely pushed into the background of criminological thought during the ‘cultural turn’, should be returned to the foreground

A distributed stream temperature model using high resolution temperature observations

Distributed temperature data are used as input and as calibration data for an energy based temperature model of a first order stream in Luxembourg. A DTS (Distributed Temperature Sensing) system with a fiber optic cable of 1500m was used to measure stream water temperature with 1m resolution each 2 min. Four groundwater inflows were identified and quantified (both temperature and relative discharge). The temperature model calculates the total energy balance including solar radiation (with shading effects), longwave radiation, latent heat, sensible heat and river bed conduction. The simulated temperature is compared with the observed temperature at all points along the stream. Knowledge of the lateral inflow appears to be crucial to simulate the temperature distribution and conversely, that stream temperature can be used successfully to identify sources of lateral inflow. The DTS fiber optic is an excellent tool to provide this knowledge

The infrastructural power of the military: The geoeconomic role of the US Army Corps of Engineers in the Arabian Peninsula

In analysing the role of the US in the global expansion of capitalist relations, most critical accounts see the US military’s invasion and conquest of various states as paving the way for the arrival of US businesses and capitalist relations. However, beyond this somewhat simplified image, and even in peacetime, the US military has been a major geoeconomic actor that has wielded its infrastructural power via its US Army Corps of Engineers’ overseas activities. The transformation of global economies in the 20th century has depended on the capitalisation of the newly independent states and the consolidation of liberal capitalist relations in the subsequent decades. The US Army Corps of Engineers has not only extended lucrative contracts to private firms (based not only in the US and host country, but also in geopolitically allied states), but also, and perhaps most important, has itself established a grammar of capitalist relations. It has done so by forging both physical infrastructures (roads, ports, utilities and telecommunications infrastructures) and virtual capitalist infrastructures through its practices of contracting, purchasing, design, accounting, regulatory processes and specific regimes of labour and private property ownership

The wages of whiteness in the absence of wages: racial capitalism, reactionary intercommunalism and the rise of Trumpism

In November 1970, Black Panther Party leader Huey P. Newton gave a lecture at Boston College where he introduced his theory of intercommunalism. Newton re-articulated Marxist theories of imperialism through the lens of the Black liberation struggle and argued that imperialism had entered a new phase called ‘reactionary intercommunalism’. Newton’s theory of intercommunalism o ers nothing less than a proto-theorisation of what we have come to call neo-liberal globalisation and its e ects on what W. E. B. Du Bois had seen as the racialisation of modern imperialism. Due to the initial historical dismissal of the Black Panther Party’s political legacy, Newton’s thought has largely been neglected for the past 40 years. This paper revisits Newton’s theory of intercommunalism, with the aim of achieving some form of epistemic justice for his thought, but also to highlight how Newton’s recasting of imperialism as reactionary intercommunalism provides critical insight into the rise of Trumpism in the US

LA DETERMINACIÓN DEL “ELEMENTO HISTÓRICO Y MORAL” DEL VALOR DE LA FUERZA DE TRABAJO

El objetivo de este artículo es discutir la interpretación marxista dominante respecto del significado de lo que Marx llamó el “elemento histórico y moral” del valor de la fuerza de trabajo y ofrecer una lectura alternativa que sea consistente con los fundamentos de la crítica marxiana de la economía política. Para tal fin, en la primera parte del artículo, se realiza una crítica de dicha interpretación basada en el reconocimiento de su génesis histórica y su filiación con la base textual y fundamentos de la crítica marxiana de la economía política. En la segunda parte, se realiza una reconstrucción crítica del legado de Marx respecto a la determinación del valor de la fuerza de trabajo y se presenta una resignificación del elemento histórico y moral en cuestión. A DETERMINAÇÃO DO “ELEMENTO HISTÓRICO E MORAL” DO VALOR DA FORÇA DE TRABALHOO objetivo deste artigo é discutir a interpretação marxista dominante sobre o significado do que Marx chamou de “elemento histórico e moral” do valor da força de trabalho e oferecer uma leitura alternativa atrelada aos fundamentos da crítica marxiana da economia política. Para tanto, na primeira parte do artigo, realizamos uma crítica da interpretação acima citada, baseada no reconhecimento de sua gênese histórica e sua filiação com a base textual e com os fundamentos da crítica marxiana da economia política. Na segunda parte, realizamos uma reconstrução crítica do legado de Marx quanto à determinação do valor da força de trabalho e apresentamos uma ressignificação do elemento histórico e moral em questão.Palavras-chave: Elemento histórico e moral. Valor da força de trabalho. Debates marxistas. Teoria marxista do salário.THE DETERMINATION OF THE “HISTORIC AND MORAL ELEMENT” OF THE VALUE OF LABOUR POWERThe aim of this article is to challenge the prevailing Marxist interpretation of what Marx called the “historical and moral component” of the value of labour-power, and to offer an alternative reading which is consistent with the foundations of the critique of political economy. In order to do so, the first part of the article develops a critique of the aforementioned Marxist view, on the basis of a reconstruction of its historical genesis, its support on textual evidence from Marx’s works and its theoretical consistency with the foundations of the critique of political economy. Subsequently, the second part of the article undertakes a critical reconstruction of Marx’s legacy on the determination of the value of labour-power and proposes a reconsideration of the meaning of its socalled “historical and moral” component.Keywords: Historical and moral element. Value of labour-power. Marxist debates. Marx’s theory of wages.LA DÉTERMINATION DE L “ÉLÉMENT HISTORIQUE ET MORAL” DE LA VALEUR DE LA FORCE DE TRAVAILL’objectif de cet article est de discuter de l’interprétation marxiste dominante de ce que Marx appelait “l’élément historique et moral” de la valeur de la force de travail et d’offrir une lecture alternative liée aux fondements de la critique marxienne de l’économie politique. Pour ce faire, dans la première partie de l’article nous critiquons l’interprétation susmentionnée, fondée sur la reconnaissance de sa genèse historique et son affiliation à la base textuelle et aux fondements de la critique marxienne de l’économie politique. Dans la deuxième partie, nous effectuons une reconstruction critique de l’héritage de Marx concernant la détermination de la valeur de la force de travail et nous y présentons une nouvelle signification de l’élément historique et moral en question.Mots-clés: Elément historique et moral. Valeur de la force de travail. Débats marxistes. Théorie marxiste du salaire