Search Results - (Author, Cooperation:H. T. Hsu)

2015-06-20

American Association for the Advancement of Science (AAAS)

0036-8075

1095-9203

Biology

Chemistry and Pharmacology

Computer Science

Medicine

Natural Sciences in General

Physics

Animals ; Caenorhabditis elegans/*embryology/genetics/metabolism ; Caenorhabditis elegans Proteins/*metabolism ; Chromatin/*metabolism ; *Gene Expression Regulation, Developmental ; Genes, Helminth ; RNA Polymerase II/*metabolism ; Trans-Activators/*metabolism ; Transcription Initiation Site ; Transcriptome

2018-06-23

BMJ Publishing

2044-6055

Medicine

Open access, Pathology

1573-0581

Springer Online Journal Archives 1860-2000

Geosciences

Physics

Abstract To estimate the loading correction, the convolution integral of tidal height with gravity Green's function is usually adopted. Therefore, two kinds of error sources should be discussed, i.e. errors produced by different earth models and errors due to the inaccuracy of the cotidal maps. Thus, the effect of different earth models on tidal correction was estimated by using different loading Love numbers and gravity Green function obtained on the basis of two different earth models, G-B and 1066 model. We also calculated the error caused by Schwidersky's cotidal map, by assuming the error of average tidal height to be 5 cm in 1°×1° grids, but yet the effect coming from the errors of local cotidal maps had not been taken into consideration in this work. In carrying out this calculation, the results of tidal height errors in adjacent ocean around station, harmonic coefficient errors in open ocean and a truncation error are discussed respectively.

Electronic Resource

1573-4803

Springer Online Journal Archives 1860-2000

Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics

Abstract High- T c YBa2Cu4O8 (124) thin films have been made by d.c. magnetron sputtering deposition on (100) MgO substrates. The effect of several processing variables, including the ratio of oxygen to argon, total pressure, and substrate temperature, on the superconducting properties of the thin films, were systematically investigated. The as-prepared films annealed in flowing oxygen at 800°C for 4 h under ambient pressure obtained nearly phase-pure 124 and exhibited superconducting onset transition at 75 K.

Electronic Resource

1432-1394

Key words. Lambda method ; United ambiguity ; decorrelation

Springer Online Journal Archives 1860-2000

Architecture, Civil Engineering, Surveying

Abstract. Ambiguity decorrelation is a useful technique for rapid integer ambiguity fixing. It plays an important role in the least-squares ambiguity decorrelation adjustment (Lambda) method. An approach to multi-dimension ambiguity decorrelation is proposed by the introduction of a new concept: united ambiguity decorrelation. It is found that united ambiguity decorrelation can provide a rapid and effective route to ambiguity decorrelation. An approach to united ambiguity decorrelation, the HL process, is described in detail. The HL process performs very well in high-dimension ambiguity decorrelation tests.

Electronic Resource

1432-1394

Key words Wavelets ; B-splines ; Gravity tides

Springer Online Journal Archives 1860-2000

Architecture, Civil Engineering, Surveying

Abstract. In this contribution we introduce the concept of multiresolution analysis (MRA) and give an explanation of the relationship between MRA and orthonormal wavelet basis. The construction of the orthonormal B-spline wavelet bases is described in detail. We extend the B-splines to `non-integral order' cases and thus obtain a new family of orthonormal wavelet bases for the space L 2(R). Some good properties of the new wavelets are demonstrated. The new wavelet family gives satisfactory performances in our research projects including seismic signal compression and gravity tide data processing.

Electronic Resource

1572-9605

Field-cooled ; granular ; paramagnetic Meissner effect ; isotropic ; anisotropic

Springer Online Journal Archives 1860-2000

Electrical Engineering, Measurement and Control Technology

Physics

Abstract The field-cooled magnetization of high-T c superconducting ceramics measured in low magnetic fields exhibits the paramagnetic Meissner effect (PME), i.e., the diamagnetic signal initially increases with decrease in temperature but reaches a maximum at temperatureT d and later decreases with decrease in temperature. Even in some samples the signal is ultimately able to transform inversely into a paramagnetic regime once the sample is cooled below a temperatureT p as long as the applied field is sufficiently small. This PME has been observed in various high-T c cuprates and is explained by disparate aspects. An anisotropic model, in which the granular superconductors are assumed to be ideally anisotropic, was first alternatively proposed in the present work so as to theoretically account for this effect. On the other hand, an isotropic model, suitable for granular superconductors with randomly oriented grains, was proposed to deal with the samples prepared by a conventional solid-state reaction method. The anomalous magnetization behavior in the present model was demonstrated to be the superposition of the diamagnetic signal, which occurs as a result of the intragranular shielding currents, over the paramagnetic one due to the induction of the intergranular component induced by these currents where the intergranular one behaved as the efective pinning centers. The PME was demonstrated by this model to exist parasitically in granular superconductors. This intergranular effect is therefore worthy of remark when evaluating the volume fraction of superconductivity for the samples from the Meissner signal, in particular, at a low magnetic field.

Electronic Resource