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Search Results: 1 - 10 of 264785 matches for " K. H. Welge "
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物理学报 , 1988,
Abstract: 本文利用脉冲紫外激光(UV)选择激发氨分子到?1A″2电子激发态的两个最低振动能级ν′2=0和ν′2=1(ν2振动),然后检测新生态H原子的飞行谱(TOF),研究了氨分子的光碎片动力学。光谱证实了最近所测的离解能D00(H-NH2)=4.645eV;绝大多数生成的NH2(X2B1)基处于非振动激发,但是具有围绕a惯性轴的高度转动激发。通过NH3(?)的ν′2=1光离解产生的NH2(X)基具有较高的内部激发,并且显示了在N=Ka转动能级上的反转布居。
Symmetry breaking in crossed magnetic and electric fields
C. Neumann,R. Ubert,S. Freund,E. Floethmann,B. Sheehy,K. H. Welge,M. R. Haggerty,J. B. Delos
Physics , 1997, DOI: 10.1103/PhysRevLett.78.4705
Abstract: We present the first observations of cylindrical symmetry breaking in highly excited diamagnetic hydrogen with a small crossed electric field, and we give a semiclassical interpretation of this effect. As the small perpendicular electric field is added, the recurrence strengths of closed orbits decrease smoothly to a minimum, and revive again. This phenomenon, caused by interference among the electron waves that return to the nucleus, can be computed from the azimuthal dependence of the classical closed orbits.
Re-establishment of olfactory and taste functions
Welge-Lüssen, Antje
GMS Current Topics in Otorhinolaryngology, Head and Neck Surgery , 2005,
Abstract: The incidence of olfactory disorders is appoximately 1-2% and they can seriously impact on the quality of life. Quantitative disorders (hyposmia, anosmia) are distinguished from qualitative disorders (parosmia, phantosmia). Olfactory disorders are classified according to the etiology and therapy is planned according to the underlying pathophysiology. In ENT patients olfactory disorders caused by sinonasal diseases are the most common ones, followed by postviral disorders. Therapy consists of topical and systemic steroids, whereas systemic application seems to be of greater value. It is very difficult to predict the improvement of olfactory function using surgery, moreover, the long term - success in surgery is questionable. Isolated taste disorders are rare and in most often caused by underlying diseases or side effects of medications. A meticulous history is necessary and helps to choose effective treatment. In selected cases zinc might be useful.
The Analysis of an HIV and AIDS Empowering Group Work Programme for Adolescents: A Quantitative Evaluation  [PDF]
K. Olivier, H. Strydom
World Journal of AIDS (WJA) , 2013, DOI: 10.4236/wja.2013.31008

In this article an HIV and AIDS group work programme empowering adolescents to deal with the possible death of their parents/caregivers will be evaluated in a quantitative fashion. The data were obtained by means of the Child Functioning Inventory High School (CFI-HIGH) developed by Perspective Training College and the Generalized Contentment Scale (GCS) of Hudson (Bloom et al., 1999: 220). The guidelines for selection and inclusion of respondents in the comparison and experimental groups will be discussed, followed by information on the measuring instruments. The article will conclude with conclusions and recommendations.

Stress Degradation Studies on Lisinopril Dihydrate Using Modified Reverse Phase High Performance Liquid Chromatography  [PDF]
Elsadig H. K. Adam
American Journal of Analytical Chemistry (AJAC) , 2014, DOI: 10.4236/ajac.2014.55039
Abstract: A simple, precise, accurate and sensitive reverse phase high performance liquid chromatographic method for simultaneous estimation of lisinopril dihydrate and its degradation products occuring under different ICH prescribed stress conditions has been modified. Drug was resolved on a C18 column, utilizing modified mobile phase of tetra butyl ammonium hydroxide solution and acetonitrile. Ultra violet detection was carried out at 210 nm. The method was modified with respect to linearity, precision, accuracy, selectivity, specificity and ruggedness. The results obtained revealed that lisinopril dihydrate was an active product slightly changed under stress conditions.
Characterization and Flotation of Sulfur from Chalcopyrite Concentrate Leaching Residue  [PDF]
H. K. Lin
Journal of Minerals and Materials Characterization and Engineering (JMMCE) , 2003, DOI: 10.4236/jmmce.2003.21001
Abstract: Elemental sulfur produced by chloride leaching of sulfide ores or concentrates contains selenium and tellurium usually too high to be used in various industrial or agricultural uses. The sulfur in the leaching residue can be upgraded to 90% in grade by froth flotation and the sulfur concentration can be followed by sulfur purification and selenium and tellurium removal. The sulfur in the leaching is in a form of discrete particles with a size range of 5 to 10 microns. The sulfur particles tend to agglomerate in the pulp and hence mechanically entrap gangue minerals. With sodium silicate as the dispersant as well as the depressant for siliceous material, a sulfur concentrate of 90% in grade and 90% in recovery can be obtained with a single-stage froth flotation. The flotation reagent consumptions are minimum. The majority of chalcopyrite remains in the sulfur flotation tailings and can be readily recovered by flotation with different flotation reagents. When amyl xanthate is used, 85% of chalcopyrite can be recovered with a copper grade of 14.5% in a single-stage froth flotation. The chalcopyrite flotation concentrate can be sent back to chloride leaching circuits.
A Case for “Radiolysis” in Radiotherapy of Keloids  [PDF]
K. Malaker, H. Weatherburn, H. De Souza
International Journal of Medical Physics,Clinical Engineering and Radiation Oncology (IJMPCERO) , 2014, DOI: 10.4236/ijmpcero.2014.34029
Abstract: Successful treatment of keloids has eluded the medical community since their first description. Multitudes of therapeutic options are available, but none achieves satisfactory resolution of keloids. One major stumbling block is lack of understanding about their genesis. Assuming keloids are tumors, attempts have been made to treat this condition with standard radiotherapy, with dismal results. Keloidal masses are not an active biological entity. They are aggregations of cellular, hypovascular, hypoxic bundles of collagen, which are produced by atypical fibroblasts in the wounds and eventually cease production due to a hostile biological environment. Having no demonstrable inherent process of disposal of these collagen bundles, this excessive collagen tends to linger to form the bulk of keloids. The lesions eventually become symptomatic and aesthetically unacceptable, and therapeutic intervention is sought. Of all available treatments, such as post-resection radiotherapy, primary radiotherapy in selected cases and primary brachytherapy stand out above any other form of treatment. Be it brachytherapy or external beam treatment, one fundamental aspect of radiation action is the process of “radiolysis”, explaining why “radiobiological” approaches have been ineffective.
Column Leaching for Simulating Heap and In-situ Soil Remediation with Metallic Fenton Reaction  [PDF]
H. K. Lin, H. V. Luong
Journal of Minerals and Materials Characterization and Engineering (JMMCE) , 2004, DOI: 10.4236/jmmce.2004.31004
Abstract: Metallic Fenton reaction was found to be more effective than classical Fenton reaction in decomposing Pentachlorophenol (PCP) in contaminated soil. The combination of metallic iron and hydrogen peroxide was used in column leaching experiments to simulate heap and in-situ soil remediation. PCP in the contaminated soil was effectively decomposed by 32% in 24 hours leaching tests, and by 41% in 48 hours leaching experiments. PCP destruction was further increased to 52% in the 48 hours leaching by lowering the solution pH to 1.8. Other than ferric oxide and carbon dioxide, no byproducts were found at the end of the reaction.
ZnSe / ZnS Quantum-Dot Semiconductor Optical Amplifiers  [PDF]
K. H Al-Mossawi
Optics and Photonics Journal (OPJ) , 2011, DOI: 10.4236/opj.2011.12010
Abstract: ZnSe quantum dot (QD) semiconductor optical amplifier (SOA) is studied theoretically using net gain for linear Absorption coefficient and linear emission and these results are used to calculate noise figure and small-signal gain.
Study the Frequency Dependence of Dielectric Properties of Gamma Irradiated PVA(1-x)PSx Polymer Blends  [PDF]
K. Prabha, H. S. Jayanna
Open Journal of Polymer Chemistry (OJPChem) , 2015, DOI: 10.4236/ojpchem.2015.54006
Abstract: PVA(1-x)PSx (x = 0.0, 0.25, 0.50, 0.75 and 1.0) polymer blend films were prepared by simple solution cast method using mixer of dimethyl sulphoxide (DMSO) and double distilled water (DDW) as a common solvent. Gamma irradiation studies have been carried out to investigate the potential for improvements in the electrical properties of pure and blend polymer film. The induced changes in the dielectric constant (εr), dielectric loss (tanδ) and AC conductivity (σac) properties for the unirradiated and irradiated films were studied, in the frequency range 50 Hz - 5 MHz at room temperature (27°C). Further, it was seen that the frequency dependent dielectric constant, dielectric loss and AC conductivity were found to increase with increasing γ irradiation dose for all the PVA(1-x)PSx (x = 0.0, 0.25, 0.50, 0.75 and 1.0) polymer blends. The maximum σac at 1 kHz frequency was observed to be 2.4421 × 10-6 s/m (at room temperature) for PVA film irradiated at 1.5 kGy.
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