Spectral averaging techniques for Jacobi matrices

Spectral averaging techniques for one-dimensional discrete Schroedinger operators are revisited and extended. In particular, simultaneous averaging over several parameters is discussed. Special focus is put on proving lower bounds on the density of the averaged spectral measures. These Wegner type estimates are used to analyze stability properties for the spectral types of Jacobi matrices under local perturbations

A 454 survey of the community composition and core microbiome of the common bed bug, Cimex lectularius, reveals significant microbial community structure across an urban landscape

Elucidating the spatial dynamic and core constituents of the microbial communities found in association with arthropod hosts is of crucial importance for insects that may vector human or agricultural pathogens. The hematophagous Cimex lectularius, known as the common bed bug, has made a recent resurgence in North America, as well as worldwide, potentially owing to increased travel and resistance to insecticides. A comprehensive survey of the bed bug microbiome has not been performed to date, nor has an assessment of the spatial dynamics of its microbiome. Here we present a survey of bed bug microbial communities by amplifying the V4-V6 hypervariable region of the 16S rDNA gene region followed by 454 Titanium sequencing using 31 individuals from eight natural populations collected from residences in Cincinnati, OH. Across all samples, 97% of the microbial community is made up of two dominant OTUs identified as the {\alpha}-proteobacterium Wolbachia and an unnamed {\gamma}-proteobacterium from the Enterobacteriaceae. Microbial communities varied among host populations for measures of community diversity and exhibited significant population structure. We also uncovered a strong negative correlation in the abundance of the two dominant OTUs, suggesting they may fulfill similar roles as nutritional mutualists. This broad survey represents the most comprehensive assessment, to date, of the microbes that associate with bed bugs, and uncovers evidence for potential antagonism between the two dominant members of the bed bug microbiome

Ricci Solitons on Lorentzian Manifolds with Large Isometry Groups

We show that Lorentzian manifolds whose isometry group is of dimension at least $\frac{1}{2}n(n-1)+1$ are expanding, steady and shrinking Ricci solitons and steady gradient Ricci solitons. This provides examples of complete locally conformally flat and symmetric Lorentzian Ricci solitons which are not rigid

Competitive adsorption of phenolic compounds from aqueous solution using sludge‐based activated carbon.

Preparation of activated carbon from sewage sludge is a promising approach to produce cheap and efficient adsorbent for pollutants removal as well as to dispose of sewage sludge. The first objective of this study was to investigate the physical and chemical properties (BET surface area, ash and elemental content, surface functional groups by Boehm titration and weight loss by thermogravimetric analysis) of the sludge‐based activated carbon (SBAC) so as to give a basic understanding of its structure and to compare to those of two commercial activated carbons, PICA S23 and F22. The second and main objective was to evaluate the performance of SBAC for single and competitive adsorption of four substituted phenols (p‐nitrophenol, p‐chlorophenol, p‐hydroxy benzoic acid and phenol) from their aqueous solutions. The results indicated that, despite moderate micropore and mesopore surface areas, SBAC had remarkable adsorption capacity for phenols, though less than PICA carbons. Uptake of the phenolic compound was found to be dependent on both the porosity and surface chemistry of the carbons. Furthermore, the electronegativity and the hydrophobicity of the adsorbate have significant influence on the adsorption capacity. The Langmuir and Freundlich models were used for the mathematical description of the adsorption equilibrium for single‐solute isotherms. Moreover, the Langmuir–Freundlich model gave satisfactory results for describing multicomponent system isotherms. The capacity of the studied activated carbons to adsorb phenols from a multi‐solute system was in the following order: p‐nitrophenol > p‐chlorophenol > PHBA > phenol

Analisis Kedudukan Komisi Pengawas Persaingan USAha Dalam Sistem Ketatanegaraan Indonesia

Penelitian ini bertujuan Untuk mengetahui kedudukan Komisi Pengawas Persaingan Usaha dalam sistem ketatanegaraan Indonesia dan Untuk mengetahui ada tidaknya tumpang tindih kewenangan antara Komisi Pengawas Persaingan Usaha dengan Lembaga Negara lain yang sudah ada. Jenis penelitian dalam penulisan hukum ini adalah penelitian hukum normatif (doctrinal research). Pendekatan yang digunakan penulis dalam penulisan hukum ini adalah pendekatan undang–undang (statue approach) dan pendekatan analitis (analitycal approach). Sedangkan teknik analisis bahan hukum yang digunakan penulis dalam penelitian ini adalah penalaran (logika) deduktif (Peter Mahmud Marzuki, 2006 : 35-47).Berdasakaran hasil penelitian dan pembahasan, maka dapat disimpulkan bahwa pertama, KPPU adalah lembaga non struktural yang independen dan berada di bawah kewenangan eksekutif. KPPU adalah salah satu lembaga yang memiliki kewenangan dalam mengawasi pelaksanaan Undang-Undang Antimonopoli. KPPU dibentuk sebagai suatu lembaga yang secara khusus mengawasi pelaku USAha dalam menjalankan kegiatan USAhanya agar tidak melakukan praktik monopoli atau persaingan USAha tidak sehat. Seperti lembaga negara bantu pada umumnya, kedudukan KPPU hanyalah sebagai pelengkap dari lembaga negara utama. Hal ini didasari pada Kenyataan bahwa lahirnya KPPU tidak serta-merta meniadakan peran lembaga negara utama dalam mengawasi pelaksanaan UU Antimonopoli. Kesimpulan kedua yaitu Kewenangan KPPU pada dasarnya sudah jelas tertera dalam Pasal 36 UU Antimonopoli, namun dalam menjalankan kewenangan-kewenangan tersebut terdapat batasan-batasan yang tidak dapat dilampaui oleh KPPU