Children in an Urban Tanzania

One in four children being born in today‟s Tanzania is likely to be growing up in an urban area. It is projected to be one in three in the short time span of one generation. Tanzania is more urban than it perceives itself and official figures disclose. Urban Tanzanians feel emotionally rooted in their villages of origin rather than in the cities and towns where one quarter of the total population lives. Urbanisation figures fail to account for extensive high density areas just because they are not officially classified as urban. Despite a persisting rural self-representation, Tanzania is one of the fastest urbanising countries in one of the world‟s fastest urbanising regions. The nearly half urban population aged 0-18 may well be the first truly urbanised generation in the history of the nation.\ud As urbanisation is rapidly transforming the physical, social and economic landscape of the country, how has Tanzania equipped itself to provide adequate water, sanitation, health care, education, protection services to meet the fundamental needs and rights of a swelling number of urban children and communities? National policy and programmatic frameworks still broadly target rural poverty, perceived as the nation‟s core development challenge. Urban poverty, growing alongside urban affluence, remains mainly unaccounted for and, as a result, unaddressed. The condition of poor and marginalised urban groups escapes official urban figures. Standard urban-rural disaggregation generates statistical averages that overshadow sub-municipal disparities. Also poverty lines tend to underestimate actual poverty. Based on mere consumption levels, they disregard living conditions, thus leaving unaccounted for several necessities that poor households are normally forced to acquire through cash purchases in a monetised urban economy. As a result, urban poverty is broadly overlooked and poor urban children, lost in skewed official estimates and tucked away in peripheral unplanned urban fringes, risk remaining invisible in development policy and investments. In-depth analysis based on sub-municipal data is urgently needed to accurately measure urban poverty in its multiple dimensions of income poverty, inadequate access to basic services and powerlessness.\ud The assumption underpinning the limited attention that has been paid to urban poverty is that of an urban advantage. Undoubtedly, cities enjoy an edge over rural areas. Urbanisation drives the development of a whole nation. High population concentration, economies of scale, proximity and agglomeration make cities engines of growth. They offer greater avenues for livelihood and education, and should be expected to afford children better opportunities for survival, growth and development than rural areas. Better economic resources and political visibility hold a potential to offer higher incomes and enhance the scope for the government and the private sector to fund services and infrastructure. Density, favouring economies of scale, promises to favour delivering of essential services.\ud Children, adolescents and youth are attracted to city life, aspiring to access better jobs, higher education and a richer cultural life. Urban areas are also hubs of technological innovation, social exchange and mass communication. Urban children can draw from resources that are denied to rural peers.\ud The urban advantage, however, is being eroded. Provision of social services and infrastructure is failing to keep pace with growing demand being generated by urbanisation.\ud  Availability of basic services, expected to be markedly higher in urban centres as compared to remote rural areas, has been declining. Decreasing urban access to improved sources of drinking water over the past decade epitomises this trend. The traditional urban – rural social sector performance gap has been narrowing against most indicators in the areas of education, health, nutrition, water and sanitation. In some cases gaps have been actually bridged and rural areas are even outperforming urban centres.\ud 7\ud  As urban social sector performance is declining, it is likely that it is the poor, underserviced communities to remain unreached. Although statistical averages prevent any level of sub-municipal analysis, limited data available on access to basic services and health and education outcomes in low-income urban communities suggests that the urban poor may be faring even worse than their rural counterparts.\ud  Urbanisation growth is projected to continue in the future. If the present scenarios are not going to be addressed now, they are likely to deteriorate further. As density increases and unplanned settlements become more congested, investments in social facilities and infrastructure can only be expected to become costlier, both financially and socially.\ud If not properly leveraged, the potential advantage that cities offer can turn into a disadvantage. A concentration of children in areas where services and infrastructure are lacking is a major disadvantage. Children residing in overcrowded and degraded settlements characterised by poorly managed sanitation systems, inadequate provision of safe water, inefficient solid waste management are faced with one of the most life-threatening environments possible – with climate change posed to increase vulnerability further. Such a disadvantage can be daunting in a situation where the overwhelming majority of urban dwellers reside in unplanned settlements, which in Tanzania‟s primate city, Dar es Salaam, are estimated to accommodate over 80 percent of the population, one of the highest proportions in Sub-Saharan Africa.\ud Availability and access are not synonymous. In most cities, availability of basic services does not translate necessarily into access. Higher quality and availability of services needs to be equally distributed across social classes and space to achieve equal access by all citizens. The difference between successfully exploiting the urban advantage and passively reeling under the urban disadvantage can be made by the way access to resources is managed. A competent, accountable and equitable system of local governance can make that difference. Good local governance can help overcome the disparities that still bar access by the poor to safe water and sanitation, quality education, adequate health care and nutrition, affordable transport, secure land tenure and decent housing. Accountable local authorities, proactive communities and enabled children are the key actors in a local governance process leading to the creation of cities friendly to children.\ud Young people are already participating in local governance processes. They are active in children‟s municipal councils, children‟s school councils and other similar institutions. Avenues for child participation needs to be strengthened and opened to all children, not only in institutional settings, but also in families and communities having primary responsibility for children‟s well being. Cities and communities provide the most relevant scale for genuine children‟s participation, where young people can effectively engage in addressing the problems that directly affect them.\ud Though universal human rights and global development goals are set at the international and national levels, it is ultimately in a myriad of local Tanzanian communities that they are expected to be fulfilled – in the family, the school, the ward and ultimately the city. The city government offers an ideal platform for converging a plethora of sectoral interventions independently targeting children and delivering them holistically, at the local level where children live. The horizon of children is local. Within the local dimension, children‟s goals and rights can be met and monitored by duty bearers who have primary responsibility for their fulfilment. If development goals and human rights are not implemented locally, they are likely to remain abstract declarations of intent and sterile. Local authorities, communities, families and children together can transform today‟s child unfriendly urban settings into child-friendly cities – as cities friendly to children are friendly to all

The Very Being of a Conceptual Scheme: Disciplinary and Conceptual Critiques

Book review of: Jeff Kochan (2017), Science as Social Existence: Heidegger and the Sociology of Scientific Knowledg

Extraction of ∣Vcd∣|V_{cd}| and ∣Vcs∣|V_{cs}| from experimental decay rates using lattice QCD D→π(K)ℓνD \to \pi(K) \ell \nu form factors

We present a determination of the Cabibbo-Kobayashi-Maskawa matrix elements $|V_{cd}|$ and $|V_{cs}|$ obtained by combining the momentum dependence of the semileptonic vector form factors $f_+^{D \to \pi}(q^2)$ and $f_+^{D \to K}(q^2)$, recently determined from lattice QCD simulations, with the differential rates measured for the semileptonic $D \to \pi \ell \nu$ and $D \to K \ell \nu$ decays. Our analysis is based on the results for the semileptonic form factors produced by the European Twisted Mass Collaboration with $N_f = 2 + 1 + 1$ flavors of dynamical quarks in the whole range of values of the squared 4-momentum transfer accessible in the experiments. The statistical and systematic correlations between the lattice data as well as those present in the experimental data are properly taken into account. With respect to the standard procedure based on the use of only the vector form factor at zero 4-momentum transfer, we obtain more precise and consistent results: $|V_{cd} |= 0.2341 ~ (74)$ and $|V_{cs} |= 0.970 ~ (33)$. The second-row CKM unitarity is fulfilled within the current uncertainties: $|V_{cd}|^2 + |V_{cs}|^2 + |V_{cb}|^2 = 0.996 ~ (64)$. Moreover, using for the first time hadronic inputs determined from first principles, we have calculated the ratio of the semileptonic $D \to \pi(K)$ decay rates into muons and electrons, which represent a test of lepton universality within the SM, obtaining in the isospin-symmetric limit of QCD: ${\cal{R}}_{LU}^{D\pi} = 0.985~(2)$ and ${\cal{R}}_{LU}^{DK} = 0.975~(1)$.Comment: 8 pages, 2 figures, 8 tables. Version to appear in EPJ

Beta-blokers in patients with cirrhosis and infection: don't blame too soon.

We found that PPI-users had a higher rate and BBs-users a lower rate of infections. The lower infection rate and better prognosis of BB-users can not be attributed, as suggested by Schiavon et al., to a higher proportion of variceal bleeding in this group; in fact, the large majority of patients hospitalized for bleeding were excluded from the study as they came to our ward already on systemic antibiotic treatment (which is usually started in the Emergency room) and this would have represented a confounding factor. Only few patients with variceal bleeding were included: they developed bleeding after enrolment and were equally distributed between those taking and not taking BBs. Following the recent debate about the ‘therapeutic window’ of BBs in cirrhotic patients (2–4), we were also interested in evaluating possible harmful effects of BBs in cirrhotic patients with infections. This was a secondary aim of our study and we certainly recognize that the study was underpowered for this purpose

Spin up and phase fluctuations in the timing of the accreting millisecond pulsar XTE J1807-294

We performed a timing analysis of the 2003 outburst of the accreting X-ray millisecond pulsar XTE J1807-294 observed by RXTE. Using recently refined orbital parameters we report for the first time a precise estimate of the spin frequency and of the spin frequency derivative. The phase delays of the pulse profile show a strong erratic behavior superposed to what appears as a global spin-up trend. The erratic behavior of the pulse phases is strongly related to rapid variations of the light curve, making it very difficult to fit these phase delays with a simple law. As in previous cases, we have therefore analyzed separately the phase delays of the first harmonic and of the second harmonic of the spin frequency, finding that the phases of the second harmonic are far less affected by the erratic behavior. In the hypothesis that the second harmonic pulse phase delays are a good tracer of the spin frequency evolution we give for the first time a estimation of the spin frequency derivative in this source. The source shows a clear spin-up of $\dot \nu = 2.5(7) \times 10^{-14}$ Hz sec$^{-1}$ (1 $\sigma$ confidence level). The largest source of uncertainty in the value of the spin-up rate is given by the uncertainties on the source position in the sky. We discuss this systematics on the spin frequency and its derivative.Comment: 17 pages, 4 figures, Accepted by Ap

Albumin infusion in cirrhotic patients with infections other than spontaneous bacterial peritonitis: End of the story?

Non-invasive assessment of liver fibrosis with impulse elastography: Comparison of Supersonic Shear Imaging with ARFI and FibroScan

Genetic typing of Candida albicans strains isolated from the oral cavity of patients with denture stomatitis before and after itraconazole therapy

This study determined, by molecular typing of C. albicans species isolated from denture stomatitis patients with a mycological relapse six months after successful itraconazole therapy, whether there had been recurrence of infection with the same strain(s), selection of particular strains or infection with new strains of C. albicans. Forty patients with long-standing Candida-associated denture stomatitis were assigned either cyclodextrin itraconazole solution or itraconazole capsules (100mg b.d. for 15 days). Palatal erythema was measured and imprint cultures undertaken at baseline and at 15 days, four weeks and six months after treatment commenced. Yeast isolates were formally identified and chromosomal DNA was extracted from pairs of isolates from those patients with C. albicans present at baseline and six months after treatment commenced. Southern blotting of EcoRI-digested chromosomal DNA was performed using the C. albicans-specific 27A repetitive element as a probe. Eighteen of 36 patients were infected with C. albicans at baseline and six months after treatment commenced. Overall, 13 genetically different strains of C. albicans were found. However, in 17 of 18 patients, the C. albicans strains isolated prior to itraconazole therapy and six months later were the same. Thus recurrence of denture stomatitis in these individuals was due to re-colonisation by the original strain, rather than re-infection with a different strain. Key words: Genotyping, C. albicans, denture stomatitis

Hypercubic effects in semileptonic decays of heavy mesons, toward B→πℓνB \to \pi \ell \nu, with Nf=2+1+1N_f=2+1+1 Twisted fermions

We present a preliminary study toward a lattice determination of the vector and scalar form factors of the $B \to \pi \ell \nu$ semileptonic decays. We compute the form factors relative to the transition between heavy-light pseudoscalar mesons, with masses above the physical D-mass, and the pion. We simulate heavy-quark masses in the range $m_c^{phys} < m_h < 2m_c^{phys}$. Lorentz symmetry breaking due to hypercubic effects is clearly observed in the data, and included in the decomposition of the current matrix elements in terms of additional form factors. We discuss the size of this breaking as the parent-meson mass increases. Our analysis is based on the gauge configurations produced by the European Twisted Mass Collaboration with $N_f = 2 + 1 + 1$ flavors of dynamical quarks at three different values of the lattice spacing and with pion masses as small as $210$ MeV.Comment: 7 pages, 5 figures; contribution to the XXXVI International Symposium on Lattice Field Theory (LATTICE2018), East Lansing (Michigan State University, USA), July 22-28, 201

Partition Regularity of Nonlinear Diophantine Equations

Ramsey Theory and partition regularity problems are interesting settings of combinatorics that investigate structural properties of families of sets. More precisely, a collection of a sets of A, namely F, is partition regular on the set A if, whenever A is finitely partitioned in C_1,...,C_r, then there exists an index j in {1,...,r} and an element of F contained in C_j. Our interest is focused on diophantine equations. In particular we answer to the following question: given a polynomial P, is P partition regular over the natural numbers? This means: given a finite partition (or colouring) of natural numbers, can we find monochromatic solutions of P? The thesis is structured in four chapters. The first chapter lays the foundations of the rest of the thesis. It starts with the theory of ultrafilters which are important and multifaced mathematical objects, whose definition can be formulated in several languages: from set theory, as maximal families of closed under finite intersection sets, to measure theory, as {0,1}-valued finitely additive measures on a given space, to algebra as maximal ideals of ring of function F^I. The chapter continues with a brief dissertation about nonstandard analysis that was created in the early 1960s by the mathematician Abraham Robinson. In particular we focus on hypernatural numbers and their properties to prove the main results of this thesis. We show that the theory of ultrafilters and nonstandard analysis are strictly connected, and they have many applications in other fields of mathematics, as combinatorics or topology. Though this, in the second chapter we can prove some important well-known results that concern partition regularity. We focus our attention on Ramsey Theory, a branch of combinatorics that studies the conditions under which order must appear. Typically, Ramsey problems are connected to questions of the form: how many elements of a given structure should there be to make true a particular property? The begin of this theory is dated back to 1928 when Frank Plumpton Ramsey published his paper "On a problem of formal logic". The paper has led to a large area of combinatorics now known as Ramsey Theory and several important results arose from it in the last century. The most important results that are relevant to our purposes are: Schur's Theorem (1916), Rado's Theorem (1933) that gives a characterisation of the homogeneous systems to which a monochromatic solution can be found in any finite colouring of the natural numbers, Van der Waerden's Theorem (1927), Hindman’s Theorem (1974), and Milliken-Taylor's Theorem (1975). Rado's Theorem completely settled the characterisation of partition regularity of the linear polynomials, and it is the starting point from which the heart of this thesis develops: the partition regularity of nonlinear equations. Actually, the third chapter is dedicated to proving the partition regularity of a few particular equations. Furthermore we give necessary conditions to say when a polynomial is partition regular. These conditions depend on Rado's Theorem and on the degree of the nonlinear variables. In the last fourth chapter we investigate the non-partition regularity of large classes of nonlinear equations. Starting from two simple non partition regular polynomials, x^2+y^2-z and x+y-z^2, we aim at extending these examples. The first step toward the generalisation is to modify the exponents: we prove that the equations x^n+y^n=z^k and x^n+y^m=z^k with n,m,k mutually distinct are non-partition regular. Subsequently we increase the numbers of variables and we prove that also the following equations are non-partition regular: x_1^n+...+x_m^n = y^k with m>1 and kn and there exists a prime p that divides m and p^{k-n} does not divide m; x_1^n+...+x_m^n = y^{n+1}. In the end considering polynomials with coefficients c_j not equal to 1, under suitable conditions on the c_j, we have that the two following equations are non-partition regular: c_1x_1^n+...+c_nx_m^n = y^k, with k1; c_1x_1^n+...+c_nx_m^n = y^{n+1}, with m>1