Showing papers by "Fu Jen Catholic University published in 1985"

The Study of Clinostomum Complanatum (RUD., 1814) V. The Influences of Metacercaria of Clinostomum complanatum on Fish

Abstract: Microscpopically, the metacercariae of Clinostomum complanatum were encapsulated by a fibrous layer to form a cyst. The cyst wall was composed of connective tissue fibers, chiefly collagen fibers, of the fish in reaction to the infection. There were blood vessels penetrating into the cyst wall and forming a capillary network. These blood vessels might supply the nutritional requirements of the metacercaria and remove the wastes produced by the worms. The metacercaria of C. complanatum got a lot of nutrients from its host for growth and storage. The possible routes of the metacercaria of C. complanatum to get nutrients from its host may be through the digestive tract or by the direct absorption of the covering of the worm from the body fluid of the fish. The morphological feature suggested that the tegument of the metacercaria of C. complanatum possessed the tegumental absorption function. Generally, the metacercariae of C. complanatum lay quiescently in the cyst. No great harm was done to fish unless there were massive numbers. The greatest damage occurred when metacercariae had been activated and migrated out of the body wall of the fish. The process of the excystment and migration of the worms caused the congestion and hemorrhage followed by the serious tissue damage. After the excystment of the metacercaria, the fish tissues around the worm were dissolved. The result indicated that the worm might produce certain enzymes to facilitate the dissolution of fish tissues and cause the death of the fish due to the destruction of the fish body.

Representation formulas for cosine and sine functions of operators II

Abstract: A l'aide d'un theoreme d'approximation du type de Korovkin, on etablit quelques formules de representation des paires de fonctions sinus et cosinus fortement continues d'operateurs lineaires

On the consequences of a cosmological model with a time-dependent cosmological «constant» and the relationship between Einstein equivalence principle, Mach's principle and dirac's principle

Abstract: Within the framework of a cosmological model with a time-dependent cosmological constant Λ, we examine the evolutionary behaviour of the Universe during the radiation-dominated and matter-dominated eras. The smallness of the cosmological constant and the origin of galaxy formation are explained. For a dust-filled universe withp≃0, the model yields a cosmological solutionk=−1,R∼t. The relationship among Einstein equivalence principle, Mach's principle and Dirac's principle is also elucidated through the time-dependent Λ. It is shown that these principles are compatible, and Mach's principle and Dirac's principle can be viewed as an initial-value condition and a dynamic consequence of Einstein's equations (satisfying Einstein equivalence principle), respectively.

Managed Floating Exchange Rates, Intervention Policy and Macroeconomic Policies

Abstract: Traditionally, international monetary economists focus their attention on the framework of either a pure fixed or a pure flexible exchange rate system. With the demise of the Bretton Woods system, many countries have begun to use an intervention policy in the foreign exchange market and adopted the regime of managed floating exchange rates. Such a change has encouraged many economists into the field of this system. Although the contributions in this area are very rich, there is no systematic analysis concerning whether intervention policy will enhance or weaken the effectiveness of macroeconomic policies. That is why this article is written.