678 research outputs found
Nonabelian Hodge theory for Fujiki class manifolds
No full textThe nonabelian Hodge correspondence (Corlette-Simpson correspondence),
between the polystable Higgs bundles with vanishing Chern classes on a compact
K\"ahler manifold and the completely reducible flat connections on , is
extended to the Fujiki class manifolds.Comment: Final versio
Non-upper-semicontinuity of algebraic dimension for families of compact complex manifolds
No full textIn this note we show that in a certain subfamily of the Kuranishi family of any half Inoue surface the algebraic dimensions of the fibers jump downwards at special points of the parameter space showing that the upper semicontinuity of algebraic dimensions in any sense does not hold in general for families of compact non-K hler manifolds. In the K hler case, the upper semicontinuity always holds true in a certain weak sense.
BIOETHICS AND THE IMPACT OF GENOMICS IN THE 21ST CENTURY: PHARMACOGENOMICS, DNA POLYMORPHISM AND MEDICAL GENETICS SERVICES
No full textb Contents -- Editorial preface and summary -- Ch. 1. Opening and welcome addresses -- 1.1. Norio Fujiki -- 1.2. Masakatsu Sudo -- 1.3. Yukio Kurita -- 1.4. Jean Bernard -- Ch. 2. Genomics and law -- 2.1. Law of technology: technology of law / Christian Byk -- 2.2. Intellectual property issues affecting genome research / Robert Kneller -- 2.3. A genomic view of life / Yuji Kobara -- Ch. 3. Pharmacogenomics (New era of genomics) -- 3.1. Current genetics for drug discovery / Yoshiji Fujita -- 3.2. Design and medicinal chemistry of ligands / Yoshiaki Kiso -- 3.3. The progress of the genome project made Japanese companies strengthen their R&D / Isao Yokoyama -- Ch. 4. Basics of DNA polymorphisms (DNA chips and SNPs) -- 4.1. Technology of DNA polymorphism analysis / Sumio Sugano -- 4.2. Detection of DNA polymorphism and its use / Takeshi Hayashi -- 4.3. Gene expression profiling by arrays / Bunsei Kawakami -- 4.4. Polymorphism: from gene mapping to pharmacogenomics / Mark K. Skolnick -- Discussion -- Ch. 5. Clinical use of DNA polymorphism (Tailor-made gene diagnosis/therapy) -- 5.1. DNA polymorphism in age-related genes / Tetsuro Miki -- 5.2. Japanese and US policies on genetic privacy / Robert Kneller -- 5.3. The fuzzy dimensions of different human life span segments in the future / R.N. Sharma -- 5.4. The ethics of prospective studies containing genetic data / Frank Yeruham Leavitt -- 5.5. Medical genetics services: policy ethics and pharmacogenomics: Indonesian view / M.K. Tadjudin -- 5.6. Chinese views on genetic information / Yanguang Wang -- 5.7. Sex and reproduction: a cross-culture view / Xin Mao -- Discussion -- Ch. 6. Panel discussion on guidelines for medical genetic services -- 6.1. Guidelines for genetic testing / Ichiro Matsuda -- 6.2. Can international codes of ethics improve services? / Dorothy C. Wertz -- 6.3. The UK human genetics commission / Philip Webb -- 6.4. Ethical discussion on prenatal diagnosis in Germany / Friedrich Vogel -- 6.5. Economics issues of genetics / Xin Mao -- 6.6. Indian code on human genetics and reproductive technology / Ishiwar C. Verma -- 6.7. The policy and ethics of gene chip technology / Erin Williams -- 6.8. Gaps between east and west have been filled / Hiraku Takebe -- 6.9. Universal declaration on the human genome and human rights / Ryuichi Ida -- 6.10. Followup studies of cloning, stem cell research and eugenics law / Norio Fujiki, et al. -- Discussion -- Ch. 7. Human genetics and medicine -- 7.1. Introduction of advanced medicines into clinical practices in Japan / Fumimaru Takaku -- 7.2. Genetics and bioethics: the current state of affairs / Erin Williams -- 7.3. Development of a new human genome project / Nobuyoshi Shimizu -- Discussion -- Ch. 8. Future of bioethics, health and the environment -- 8.1. Universality of bioethics in love / Darryl Macer -- 8.2. Lessons from the Tokyo session / Christian Byk -- Discussion -- 8.3. Closing address / Norio Fujiki -- 8.3. Closing address / Keiichi Ueda -- Ch. 9. Public lectures for MURS-Japan -- 9.1 Norio Fujiki -- 9.2. Michio Okamoto -- 9.3. Rein Kimura -- 9.4. Seiji Fujita -- 9.5. Yukio Yamori -- Acknowledgments -- Overseas participant and speakers address lis
Twistors and bi_hermitian surfaces of non-K\"ahler type
No full textThe aim of this work is to give a twistor presentation of recent results about bi-Hermitian metrics on compact complex surfaces with odd first Betti number
Grazing incident X-ray topographs of heteroepitaxial ZnSe films on GaAs substrates
No full textSurface reflection topographs of heteroepitaxial ZnSe films on GaAs substrates were obtained using grazing incident synchrotron X-ray radiation. The topographs indicated that diffraction occurred only in the ZnSe epilayer because no misfit dislocations within the interface were visible. Furthermore, the lattice perfection of the ZnSe epilayer was lower than that of the GaAs substrate, although strain relaxation arose due to the nucleation of misfit dislocations
A moment map for twisted-Hamiltonian vector fields on locally conformally K\"ahler manifolds
No full textWe extend the classical Donaldson-Fujiki interpretation of the scalar
curvature as moment map in K\"ahler Geometry to the wider framework of locally
conformally K\"ahler Geometry.Comment: 19 pages. Minor corrections. To appear in Transform. Group
Assessment of heteroepitaxial ZnSe layers on GaAs by means of grazing incident X-ray topography
No full textGrazing incident X-ray reflection topography was used to evaluate the crystal perfection of ZnSe epilayers grown by metalorganic vapour phase epitaxy on low-dislocation-density (10 0)GaAs substrates. Grazing incident topographs were recorded from 224 reflections at a wavelength and an incident angle of 0.1334nm and 0.17°, respectively. We found that there is a remarkable difference between samples with ZnSe epilayer thinner than the critical thickness and thicker samples; lattice imperfections in thin ZnSe heteroepitaxial layers consist of small changes of the ZnSe lattice constant and bending of the crystal planes
Big Mac parity, income, and trade
No full textNontraded inputs account for the lion's share of a Big Mac price (Ong 1997, Parsley and Wei 2003). Major departures from Big Mac PPP may then be explained by the Balassa-Samuelson income differences effect, as shown e.g. by Click (1996). But it has been argued that Click''s result is not robust to changing estimation methods, sample of countries, and time period (Fujiki and Kitamura 2003). Here we address a key theoretical distinction between high and low income countries for the Balassa-Samuelson effect to be properly evaluated. Since this distinction is missing in Click''s analysis, we revisit his finding and take a sample which is distinct (in terms of both set of countries and time period) to meet Fujiki-Kitamura''s criticism. We find that distinguishing high from low income makes no harm to Click''s result. But we also find that openness to trade (viewed as a proxy for trade barriers) helps to explain departures from Big Mac PPP.
Computing Riemann-Roch polynomials and classifying hyper-K\"ahler fourfolds
No full textWe prove that a hyper-K\"ahler fourfold satisfying a mild topological
assumption is of K3 deformation type. This proves in particular a
conjecture of O'Grady stating that hyper-K\"ahler fourfolds of K3
numerical type are of K3 deformation type. Our topological assumption
concerns the existence of two integral degree-2 cohomology classes satisfying
certain numerical intersection conditions.
There are two main ingredients in the proof. We first prove a topological
version of the statement, by showing that our topological assumption forces the
Betti numbers, the Fujiki constant, and the Huybrechts-Riemann-Roch polynomial
of the hyper-K\"ahler fourfold to be the same as those of K3
hyper-K\"ahler fourfolds. The key part of the article is then to prove the
hyper-K\"ahler SYZ conjecture for hyper-K\"ahler fourfolds for divisor classes
satisfying the numerical condition mentioned above.Comment: 34 pages. v3: Minor corrections, references update
The geometry of antisymplectic involutions, I
No full textWe study fixed loci of antisymplectic involutions on projective hyperkahler manifolds of K3([n])-type. When the involution is induced by an ample class of square 2 in the Beauville-Bogomolov-Fujiki lattice, we show that the number of connected components of the fixed locus is equal to the divisibility of the class, which is either 1 or 2
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