4,881 research outputs found
Conflicts of Jurisdiction in the Antitrust Field: The Example of Export Cartels
Förbehandling av bioslam för ökad biogasproduktion Eftersom bioslam från aktivslamsteget i reningsprocessen ger en lägre metanproduktion än primärslam bör förbehandlingen ske på bioslam. Effekten av olika förbehandlingsmetoder är dock svårbedömd och ofta erhålls inget positivt energiutbyte då energin av ökad produktion av biogas kan vara mindre än tillförd energi vid behandlingen. Vissa förbehandlingsmetoder som ozonering kan vid överdosering oxidera substrat och ge minskad biogasproduktion Litteraturstudien kompletterades med mätning av biometanpotential efter förbehandling av bioslam (Khayi, 2014). Som förbehandlingsmetoder valdes frysning (djupfryst och lättfryst) och uppvärmning. Vid 35 dagars rötning producerade djupfryst slam 221 Nml CH4/g VS, lättfryst 115 Nml CH4/g VS, det uppvärmt 181 Nml CH4/g VS och det obehandlade (referens) 148 Nml CH4/g VS (Nml, normalmilliliter är gasvolym omräknad till en atmosfärs tryck). Djupfrysning och uppvärmning ökade biogasproduktionen medan lättfrysning gav minskad biogasproduktion. Uppgradering av biogas Vid uppgradering separeras koldioxid från biogasen varvid metangas erhålles. Uppgradering kan ske genom att koldioxiden absorberas av ett fast (PSA-teknik med zeoliter eller aktivt kol) eller flytande medium (vattenskrubber, polyetylenglykol eller monoetanolamin) eller med membranteknik. Investeringskostnaden för uppgradering är starkt beroende av storleken på anläggningen snarare än av vilken teknik som används, men vid små är investeringskostnaden för membranteknik något lägre. Genom intern metananrikning i rötkammaren kan metanhalten i den producerade biogasen ökas. Detta åstadkommes genom att koldioxid avdrivs från slam som sedan återförs till rötkammaren.QC 20140902</p
High-Efficiency Modified Fresnel Reflectors for Solar-Energy Concentration
A study has been made of the Fresnel reflector and two variations of this reflector for use as solar-energy collectors. One variation is the conical Fresnel reflector in which the serrations are located on the inner surface of a cone. It is shown that this reflector can have a collection efficiency of 1.00 for any rim angle, if the proper cone angle is selected. Equations are developed for the design of the second variation which consists of a reflector plane that is not perpendicular to the incoming light rays. Segments of this reflector can be used to form a pyramidal collector which combines the desired flatness of the Fresnel reflector with the high efficiency of the conical Fresnel reflector. This collector can have an efficiency which is very close to 1.00 when a sufficient number of reflective sides are used
Role of Charm Factory in Extracting CKM-Phase Information via B --> DK
In this paper we study the impact of data that can be obtained from a Charm
Factory on the determination of the CKM parameter gamma from decays of the form
B -> D0 K where the D0 decays to specific inclusive and exclusive final states.
In particular, for each exclusive final state , the charm factory can
determine the strong phase difference between D0-> f and D0-bar -> f by
exploiting correlations in psi(3770)-> D0 D0-bar. This provides crucial input
to the determination of gamma via the interference of B+- -> K+- D0 -> f with
B+- -> K+- D0-bar -> f. We discuss how the method may be generalized to
inclusive final states and illustrate with a toy model how such methods may
offer one of the best means to determine gamma with 10^8-10^9 B-mesons.Comment: 12 pages, 7 figures, Version 2: Fixed typos; add reference; Version
3: fixed latex glitc
Bounds on charged higgs boson in the 2HDM type III from Tevatron
We consider the Two Higgs Doublet Model (2HDM) of type III which leads to
Flavour Changing Neutral Currents (FCNC) at tree level. In the framework of
this model we can use an appropriate form of the Yukawa Lagrangian that makes
the type II model limit of the general type III couplings apparent. This way is
useful in order to compare with the experimental data which is model dependent.
The analytical expressions of the partial width are
derived and we compare with the data available at this energy range. We examine
the limits on the new parameters from the validness of
perturbation theory.Comment: 14 pages, 4 figures, Universidad Nacional de Colombia. typos
correcte
The Role of National Antitrust Laws in the Promotion of International Competition
Professor Rahl\u27s international antitrust challenge is a first-class, pocket-sized introduction to a debate that has run for decades and yet shows no signs of exhaustion. The piece echoes many of the themes of Professor Rahl\u27s important 1974 Cornell article, while bringing new freshness and vigor to the problem. His challenge demonstrates, in a few simple pages, that the scores of books and hundreds of articles of the last fifteen years have still not resolved key policy questions on the role of national antitrust laws in international commerce
The Role of National Antitrust Laws in the Promotion of International Competition
Professor Rahl\u27s international antitrust challenge is a first-class, pocket-sized introduction to a debate that has run for decades and yet shows no signs of exhaustion. The piece echoes many of the themes of Professor Rahl\u27s important 1974 Cornell article, while bringing new freshness and vigor to the problem. His challenge demonstrates, in a few simple pages, that the scores of books and hundreds of articles of the last fifteen years have still not resolved key policy questions on the role of national antitrust laws in international commerce
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