A5011972193- Advanced Chemical Physics Studies
- Radio Frequency Integrated Circuit Design
- Atmospheric chemistry and aerosols
- Atmospheric Ozone and Climate
- Microwave Engineering and Waveguides
- Quantum, superfluid, helium dynamics
- Molecular Spectroscopy and Structure
- Astrophysics and Star Formation Studies
- Acoustic Wave Resonator Technologies
- Advancements in PLL and VCO Technologies
- Soil Moisture and Remote Sensing
- Magnetic properties of thin films
- Superconducting and THz Device Technology
- Spectroscopy and Laser Applications
- VLSI and Analog Circuit Testing
- Catalytic Processes in Materials Science
- Analog and Mixed-Signal Circuit Design
- Physics of Superconductivity and Magnetism
- Cold Atom Physics and Bose-Einstein Condensates
- Semiconductor Lasers and Optical Devices
- Advanced Power Amplifier Design
- Atomic and Molecular Physics
- Adaptive optics and wavefront sensing
- Photonic and Optical Devices
- Quantum and electron transport phenomena
University of Gothenburg
2009-2024
Ericsson (Sweden)
2011-2024
SINTEF
2015-2024
SINTEF Industry
2019-2024
Autoliv (Sweden)
2024
Lund University
2017-2019
SASTRA University
2018
Omnisys Instruments (Sweden)
2003-2014
KTH Royal Institute of Technology
2008-2014
Leiden University
2004-2011
Context.Hydrogenation reactions of CO in inter-and circumstellar ices are regarded as an important starting point the formation more complex species.Previous laboratory measurements by two groups hydrogenation provided controversial results about rate methanol.Aims.Our aim is to resolve this controversy independent investigation reaction scheme for a range H-atom fluxes and different ice temperatures thicknesses.To fully understand data, interpreted theoretically means continuous-time,...
A detailed kinetic analysis of the complex reaction systems arising from ozonolysis C2H4 and (CH3)2CC(CH3)2 (TME), respectively, is carried out, using master equations statistical rate theory. The thermochemical as well molecular data required are obtained CCSD(T)/TZ2P B3LYP/DZP calculations. It shown that primary ozonides not collisionally stabilized under atmospheric conditions. In sequence for O3 + TME, same true CH2C(CH3)OOH formed (CH3)2COO, which completely dissociates to give OH...
The Sub-millimetre and Millimetre Radiometer (SMR) is the main instrument on Swedish, Canadian, Finnish French spacecraft Odin. It consists of a 1.1 metre diameter telescope with four tuneable heterodyne receivers covering ranges 486-504 GHz 541-581 GHz, one fixed at 118.75 together backends that provide spectral resolution from 150 kHz to 1 MHz. This Letter describes Odin radiometer, its operation performance data processing calibration described in Paper II.
Context. Absorption of ultraviolet radiation by water ice coating interstellar grains can lead to dissociation and desorption the molecules. These processes are thought be important in gas-grain chemistry molecular clouds protoplanetary disks, but very few quantitative studies exist.
Thermal rate constants are calculated for the H + CH(4) --> CH(3) H(2) reaction employing potential energy surface of Espinosa-Garcia (Espinosa-Garcia, J. Chem. Phys. 2002, 116, 10664). Two theoretical approaches used. First, we employ multiconfigurational time-dependent Hartree method combined with flux correlation functions. In this way in range 225-400 K obtained and compared previous results using same but Wu et al. (Wu, T.; Werner, H.-J.; Manthe, U. Science 2004, 306, 2227). It is found...
Finasteride is employed in treatment of benign prostatic hyperplasia man, where its target enzyme steroid 5α-reductase. It a novel, potent mechanism-based inhibitor the human prostate (type 2) isozyme. Although it accepted as an alternate substrate and ultimately reduced to dihydrofinasteride, this proceeds through enzyme-bound NADP−dihydrofinasteride adduct. processed with second-order rate constant, ki/Ki = 1 × 106 M-1 s-1, that approaches kcat/Km for reduction testosterone, 3 essentially...
We present the results of classical dynamics calculations performed to study photodissociation water in crystalline and amorphous ice surfaces at a surface temperature 10 K. A modified form recently developed potential model for molecule [S. Andersson et al., Chem. Phys. Lett. 408, 415 (2005)] is used. Dissociation top six monolayers considered. Desorption H(2)O has low probability (less than 0.5% yield per absorbed photon) both types ice. The final outcome strongly depends on original...
A differential wideband LNA for a multistandard receiver has been designed and implemented in 0.18/spl mu/m CMOS. The circuit topology is two-stage amplifier with active feedback. input stage common-source common-drain the feedback loop impedance matching. Bandwidth enhancement inductive shunt-peaking used maximizing bandwidth. Measurements on fabricated device show power gain of 13.1 dB 3-dB bandwidth nearly 7 GHz together an IIP3 1-dB compression point -4.7 dBm -15.2 respectively. measured...
Several questions of importance have yet to be clarified concerning the sticking a light particle on surface. Among these are following: relation between permanent "sticking" and temporary "trapping," "scaling" coefficient with incident angle, role quantum-mechanical resonance phenomena in promoting sticking. We consider other connection data taken for ${\mathrm{H}}_{2}$ ${\mathrm{D}}_{2}$ molecular beams energy range 8-45 meV angles incidence 0\ifmmode^\circ\else\textdegree\fi{}...
Experimental and clinical studies in a variety of nonprimate species demonstrate that progesterone withdrawal leads to changes gene expression initiate parturition at term. Mice deficient 5alpha-reductase type I fail undergo cervical ripening term despite the timely onset luteolysis blood.Our objective was test hypothesis estrogen metabolism is regulated tissues during pregnancy, even which not characterized by blood.Estradiol quantified intact from nonpregnant pregnant women before or after...
Estrogen receptor β (ERβ) is activated in the prostate by 5α-androstane-3β,17β-diol (3β-Adiol) where it exerts antiproliferative activity. The proliferative action of androgen 5α-dihydrotestosterone (DHT). Thus, growth governed balance between and ERβ activation. 3β-Adiol a high-affinity ligand agonist derived from DHT 3-keto reductase/3β-hydroxysteroid dehydrogenase enzymes. Here, we demonstrate that, when expressed living cells containing an estrogen response element-luciferase reporter,...
UV irradiation of simple ices is proposed to efficiently produce complex organic species during star- and planet-formation. Through a series laboratory experiments, we investigate the effects H2O concentration, dominant ice constituent in space, on photochemistry more volatile species, especially CH4, mixtures. In thin (~40 ML) mixtures, kept at 20-60 K, are irradiated under ultra-high vacuum conditions with broad-band hydrogen discharge lamp. Photodestruction cross sections (CH4 NH3)...
The ultraviolet (UV) photodissociation of amorphous water ice at different temperatures is investigated using molecular dynamics (MD) simulations and analytical potentials. Previous MD calculations UV crystalline 10 K [S. Andersson et al., J. Chem. Phys. 124, 064715 (2006)] revealed—for both types ice—that H atom, OH, H2O desorption are the most important processes after photoexcitation in uppermost layers ice. Water takes place either by direct recombined water, or when, dissociation, an...
The performance of 39 different LDA, GGA, meta-GGA, and hybrid density functionals has been evaluated, for calculating forward reverse barrier heights 10 gas-phase reactions involving hydrogen. are all relevant to astrochemistry. Special focus is put on the applicability DFT rates corresponding surface hydrogenation that chemistry ice-coated interstellar grains. General trends in H atoms, H2, OH discussed. OH+CO reaction shown be a very problematic case DFT. best overall found functionals,...
Cation/proton exchange has been recognized for decades in mammalian mitochondria, but the exchanger proteins have eluded identification. In this study, a cDNA from human brain library, previously designated NHA2 genome, was cloned and characterized. The transcript bears more similarity to prokaryotic than known eukaryotic sodium/proton exchangers, it found be expressed multiple organs cultured cells. A mAb generated label an approximately 55-kD native protein tissues cell lines. specificity...
This paper describes an embedded high density 128 Kb memory, utilizing a 5-transistor (5T) single bitline SRAM cell in standard 0.18 /spl mu/m CMOS technology. The 5T-SRAM allows writing of '1', when the voltage at its is Vcc. As consequence, for nondestructive read operation, precharged to Vpc=600 mV<Vcc=1.8 V. A based on 5T cell, has 23% smaller area, 75% lower leakage, and read/write performance comparable conventional 6T SRAM. robustness design been validated worst-case process variations.
A 1.4V wideband inductorless LNA, implemented in a 0.13μm CMOS process, consumes 25mW and occupies 0.019mm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> . Measurement results show 17dB voltage gain, 7GHz BW, 2.4dB NF at 3GHz, -4.1 dBm IIP3, -20dBm P <sub xmlns:xlink="http://www.w3.org/1999/xlink">1dB</sub> common-drain feedback circuit provides 50Omega input matching partial noise cancellation. current reuse technique improves both gain power.
The importance of tunnelling in the formation CO2 from O(3P) + CO at very low temperatures is studied with harmonic quantum transition state theory. To optimize state, we have used both fitted potential energy surfaces and direct dynamics, where forces energies are calculated by a chemistry code on fly as they needed. Whilst does increase classical reaction rate for addition temperatures, onset too to significantly contribute interstellar CO2. Instead, it more likely that an oxygen atom...
We demonstrate a spin diode consisting of semiconductor-free nanoscale Fe/MgO-based double tunnel junction. The device exhibits near perfect spin-valve effect combined with strong effect. mechanism consistent our data is resonant tunneling through discrete states in the middle ferromagnetic layer sandwiched by barriers different spin-dependent transparency. observed magnetoresistance record high>1000%, essentially making structure an on/off switch. This, effect, approximately 100,...
Reactions of SiO molecules have been postulated to initiate efficient formation silicate dust particles in outflows around dying (AGB) stars. Both OH radicals and H 2 O can be present these environments their reactions with the smallest cluster, Si , affect efficiency eventual formation. Rate coefficients gas-phase oxidation clustering SiO, 3 calculated using master equation calculations based on density functional theory calculations. The show that involving are fast. not routes but may...
Following 157 nm photoexcitation of amorphous solid water and polycrystalline ice, photodesorbed molecules (H(2)O D(2)O), in the ground vibrational state, have been observed using resonance-enhanced multiphoton ionization detection methods. Time-of-flight rotationally resolved spectra were measured, kinetic internal energy distributions obtained. The measured are good accord with those predicted by classical molecular dynamics calculations for kick-out mechanism a molecule from ice surface...