Catalytic ammonia decomposition and tar reduction by a Ni catalyst were studied using a feed gas from a pilot-scale pressurized fluidized-bed gasifier. Tests were conducted in a tubular fixed-bed reactor with a space time of about 3 s at 800-900 degreesC and 12 atm. Ammonia removals of 35-95% and light tar conversions of 90-95% were observed. The amount of the light hydrocarbons was found to have

In 131I SPECT, image quality and quantification accuracy are degraded by object scatter as well as scatter and penetration in the collimator. The characterization of energy and spatial distributions of scatter and penetration performed in this study by Monte Carlo simulation will be useful for the development and evaluation of techniques that compensate for such events in 131I imaging. METHODS: Fi

Efficient protein synthesis in bacteria requires initiation factor 2 (IF2), elongation factors Tu (EF-Tu) and G (EF-G), and release factor 3 (RF3), each of which catalyzes a major step of translation in a GTP-dependent fashion. Previous reports have suggested that recruitment of factors to the ribosome and subsequent GTP hydrolysis involve the dimeric protein L12, which forms a flexible "stalk" on

Popular Abstract in Swedish Ett nytt betygssystem infördes i grundskolan i Sverige 1995. Det tidigare relativa eller normrelaterade systemet ersattes av ett kriterierelaterat, benämnt det mål- och kunskapsrelaterade betygssystemet. Övergången till kriterierelaterade bedömningsprinciper ställer nya och andra krav på lärare. I denna studie undersöks lärares sätt att erfara betygssystemet och dess tiThis thesis reports results from a study that focuses on how teachers experience the criterion-referenced grading system and how they say they use it in their professional work. The empirical study was carried out as semi-structured audiotaped interviews with thirty qualified teachers, in the subjects English, Maths and Swedish. The outcome of the qualitative analysis consists of four parts. In th

Electric field (EF) induced quenching of the fluorescence of large (ca. 10(3) monomers) single chains of MEH-PPV was observed. Directly after application of the field most of the individual MEH-PPV chains were either unaffected by the field or completely quenched by it, while the number of affected molecules increased with the strength of the EF Moreover, application of the field induced fluoresce

BACKGROUND: Diabetes type 1 is associated with an increased risk for infant congenital malformations. It is debated whether this is true also at gestational diabetes. AIMS: To study occurrence of congenital malformations in infants whose mothers had preexisting or gestational diabetes. STUDY DESIGN: A register study covering over 1.2 million Swedish births in 1987-1997 based on the Swedish health

Skriften ger en relativt heltäckande beskrivning av vattenavvisande fasadimpregneringar och ger praktiska råd vid applicering av vattenavvisande preparat. Olika typer av preparat, deras användningsområde, fysikaliska princip och kemiska uppbyggnad beskrivs utförligt.

Preface: This report has been produced in order to celebrate the 60th anniversary of professor Lars Erik Nevander on the 11th of November, 1981. A number of topics are presented within the field of building physics. They relate to heat transfer in buildings, air infiltration, moisture darnages etc, varying from energy conservation aspects to failures of the building and its design for moisture pro

An ABO genotype screening method discriminating the common alleles A1, A2, B, O1 and O2 at the ABO locus was made possible by the discovery of a novel nucleotide substitution (G1096A) present only in B and O2 alleles. A rapid and reliable single-tube approach using multiplex PCR with four primers amplifying exons 6 and 7 of the ABO genes followed by simultaneous addition of two restriction enzymes

A quadrature voltage controlled oscillator (QVCO) topology exhibiting low power consumption and high phase noise performance at low supply voltages is presented. The QVCO buffer includes varactors to maximize the output voltage and minimize the current consumption. Microstrip theory and the principle of conservation of energy have been used to evaluate the distributed capacitances of symmetrical i

Objective: Men with advanced prostate cancer are at high risk for bone metastases that result in significant skeletal morbidity. This review discusses the pathophysiology of bone metastases in prostate cancer. Methods: Relevant information was identified through searches of published studies, abstracts from scientific meetings, and review articles. Results: Bone metastases are common in patients w