Search results

In this paper, heat and mass balances of the intercooler in a 100 kW Proton Exchange Membrane Fuel Cell (PEMFC) system are analyzed by employing a commercial software IPSEpro. The compressor, ambient temperature, the humidification method and the PEMFCs cathode operating temperature were considered as the parameters influencing the heat and mass balances in the intercooler. Parametric studies of t

Purpose of this paper The purpose of this paper is to develop an evaluation model comparing a one-way with a returnable packaging system from a supply chain perspective. Design/methodology/approach A theoretical evaluation model for comparing cost efficiency and environmental impact of one-way and returnable packaging systems in supply chains is developed from literature. The deducted model is su

A fully integrated differential class-AB power amplifier has been designed in a 0.25 um CMOS technology. It is intended for medium output power ranges such as Bluetooth class 1, and has an operating frequency of 2.45 GHz. By using two parallel output stages that can be switched on or off, a high efficiency can be achieved for both high and low output power levels. The simulated maximum output powe

E. coli continues to be a popular host organism for production of recombinant proteins. To obtain a high volumetric productivity at the cultivation stage, it is important to achieve a high cell density and a high specific productivity per cell. In many fed-batch processes, the substrate feed rate eventually becomes limited by the oxygen transfer capacity of the bioreactor. While biomass can contin

Spleen T-lymphocytes, especially CD4(+) T-cells, have been demonstrated to be involved in broad immunomodulation and host-defense activity in vivo. Apolipoprotein M gene (apoM) may have an important role in the regulation of immunoprocess and inflammation, which could be hypothesized to the apoM containing sphingosine-1-phosphate (S1P). In the present study we demonstrate that the splenic CD4(+) T

Despite the unprecedented interest in organic-inorganic metal halide perovskite solar cells, quantitative information on the charge transfer dynamics into selective electrodes is still lacking. In this paper, we report the time scales and mechanisms of electron and hole injection and recombination dynamics at organic PCBM and Spiro-OMeTAD electrode interfaces. On the one hand, hole transfer is com

Hyperplasia of the middle ear mucosa contributes to the sequelae of acute otitis media. Understanding the signal transduction pathways that mediate hyperplasia could lead to the development of new therapeutic interventions for this disease and its sequelae. Endotoxin derived from bacteria involved in middle ear infection can contribute to the hyperplastic response. The p38 mitogen-activated protei

The most precise method of investigating possible space-time variations of the fine-structure constant, alpha equivalent to (1/hc)(e(2)/4 pi epsilon(0)), using high-redshift quasar absorption lines is the many-multiplet (MM) method. For reliable results this method requires very accurate relative laboratory wavelengths for a number of UV resonance transitions from several different ionic species.

In this study, we found Lewis X (Le(X)) determinants on 68% of Helicobacter pylori isolates from patients with chronic gastroduodenal diseases. Anti-Le(X) IgG were detected more frequently in the sera from dyspeptic children and adults (45 and 46%), with or without proved (culture) H. pylori infection, than in the sera from healthy individuals (14%, and 25%). In contrast, the prevalence of anti-Le

The recently described oomycete pathogen Phytophthora pisi causes root rot on pea and faba bean, while the closely related Phytophthora sojae is the causal agent of soybean root and stem rot. Differences in the pathogenicity factor repertoires that enable the two species to have distinct host specificity towards pea and soybean, were studied using tandem mass spectrometry in a global proteome stud

This study investigated eyewitnesses’ memory and confidence accuracy for action information (what happened at the crime scene), and detail information (descriptions of persons, objects, time and place). In Experiment 1, 89 participants watched a film and participated in one of four conditions: Laboratory discussion, Family discussion, Retell and Control, the first three with five meetings each. Th

The conditions for binding of antibodies to glycosphingolipids separated on a thin-layer plate have been optimized for polyclonal antisera. The method has a broad detection range with low background staining. Examples are shown for the detection of blood group A and B active glycosphingolipids.

Myelin oligodendrocyte glycoprotein-induced experimental autoimmune encephalomyelitis (EAE) is an inflammatory disease in rats that closely mimics many clinical and histopathological aspects of multiple sclerosis. Non-MHC quantitative trait loci regulating myelin oligodendrocyte glycoprotein-induced EAE have previously been identified in the EAE-permissive strain, DA, on rat chromosomes 4,10,15, a

The number of discovered non-radially pulsating white dwarfs (WDs) in cataclysmic variables (CVs) is increasing rapidly by the aid of the Sloan Digital Sky Survey (SDSS). We performed photometric observations of two additional objects, SDSS J133941.11+484727.5 (SDSS 1339), independently discovered as a pulsator by Gansicke et al., and SDSS J151413.72+454911.9, which we identified as a CV/ZZ Ceti h

Popular Abstract in Swedish Vårt immunsystem är uppbyggt runt två typer av celler som har som uppgift att försvaraoss mot infektioner. T lymfocyterna står för det cellmedierade immunförsvaret som är speciellt viktigt för att bekämpa virusinfektioner med B lymfocyterna har som uppgift att producera antikroppar. Antikroppar finns i alla kroppsvätskor och kan interagera med toxiner, virus och bakteriEach immunoglobulin (Ig) V gene segment contains an upstream promoter region. The octamer element and the TATA box are the only elements that are conserved in all Ig promoters. The presence of the octamer element is necessary, but not sufficient to support high levels of transcription. Therefore, the activity of other co-stimulatory elements is required. This investigation has focused on the study

In this study, a three-dimensional calculation method has been developed to simulate and analyze steam reforming of natural gas, and the effects on various transport processes in a duct from a compact steam reformer. The reformer conditions such as the combined thermal boundary conditions on solid walls, mass balances associated with the reforming reactions and gas permeation to/from the porous ca

A new sample-and-hold circuit based on the charge sampling technique is introduced, which integrates input current instead of tracking input voltage to realize high speed and low voltage sampling. Both the theoretical analysis and the experimental results prove that it can realize both sample-and-hold and amplification functions. A 500 MS/s charge sampling circuit is implemented in 0.25 μm CMOS pr

A new topic that during the last years has come to the attention of researchers is supply chain security. Stakeholders are progressively realizing the importance to join the authority regulations issued by governments (e.g. AEO) to reduce transport delays at Customs or other business certifications (e.g. TAPA) to reduce theft or counterfeiting. However the differences and impacts of security certi