The principle and some applications in dentistry of the finite-element method

The finite-element method (FEM) was developed in the 1950s, and is comparatively new. The application range of FEM is very wide; for example, FEM is used in the field of the design of the buildings, cars, aircraft, acoustic equipment, dams and the tunnels, simulation of the global environment, the comet crashes and so on. Therefore, FEM is an indispensable method at present. As for the medical field, FEM is applied to changes of the endovascular bloodstream, inner stress on the jawbone distributed by articulation, periodontal features when receiving an impact and so on. Current personal computers have 10000 times the throughputs of mainframe computers in the 1970s, so impressive analysis is possible without problems. Also, Japanese researchers have the initiative in the world in this field of dentistry. FEM can be analyze flow and heat etc. in addition to structure; therefore, novel ideas from young researchers are expected

鋼中の介在物・析出物分散制御による製品品質向上に関する研究

Tohoku University谷口尚司課

On the "A Century, of Dental Art 1820-1921" published by Claudius Ash, Sons&Co. in 1921

Although "A Century of Dental Art" by well-known British dental manufacturer Claudius Ash, Sons&Co. which appeared in 1921 is booklet of only 65 pages, it is referred to in many books on dental history. The following is a review of this booklet, which is divided into two parts. The first is a "Memoir" about Claudius Ash and early developments in dentistry. The second, entitled "A Century of Dental Art, 1820-1921", gives us instruction of dental supplies of mineral teeth, chairs, cabinets, cements, amalgams, impression materials, rubbers, extracting instruments, operating instruments, dental engines and engine instruments, burs and castings. Many dental supplies were invented during this period

中小製造業における家業の維持発展への意思の形成要因

早大学位記番号:新8105早稲田大

Industrial Heritage in the Ikuno Area, Hyogo Prefecture

Our team has researched the conservation of Japan’s industrial heritage. In February and November 2001, we surveyed the Ikuno Silver Mine in Hyogo Prefecture and presented a report on the conservation of the area's industrial heritage. [Ⅰ] In this chapter, the history of the Ikuno mine is described based on the literature. [Ⅱ] This chapter shows a chronological table about Ikuno mine. That information was extracted from the literature which had already been issued. [Ⅲ] The Ikuno Silver Mine and its surrounding iron bridges at Habuchi (built in 1883/1885) and Mikohata (built in 1885), are described. Japan has only these two cast-iron bridges now. They are like the world's first iron bridge at Shrophare but are smaller. In the 17th and 18th centuries and during the first half of Meiji era, Japanese silver mining (at Ikuno, Iwami, Sado and other mining sites) flourished and was at the height. [Ⅳ] Nearby Kuchiganaya is described in this chapter. The traditional townscape along the old main street is conserved through regulations and ordinances established by the Ikuno municipal office and the Hyogo prefectural government. [Ⅴ] This chapter contains an account of our excursion to Asago, a town next to Ikuno, to see the Okutataragi hydroelectric power plant and the Mikohata smelting works. At Mikohata, we researched the abandoned smelting plant and its facilities along the mountain slope. We also studied the European-style home for foreign engineers and constructed in the Meiji era. In Okutataragi is the one of the largest pumping-up power plants in Japan. An old farmhouse roofed with glass moved from the site of the dam has been conserved and is on exhibit in the local park. [Ⅵ] After the Ikuno Silver Mine closed in 1973, some parts of the mining tunnels were opened to tourists. Various mining machines, tools and trolleys have been exhibited in a museum and tunnels at the site of the mine. The mining company has established museum of various ores from all over the world. These exhibits are described in this chapter.departmental bulletin pape

Relation between the technology and science.（2）

Until the end of the Medieval times, there were no connection between technology and science. But, in the 12th century, the university began to be established in Europe. 　In the early modern times, industry spreads, and increase of the power output and the enlargement of the tool and the device begin. Scientific research began to be organized. The experiment and observation in the scientific research became important. Thus, the science approaches in the technology. 　For the industrial revolution period, production capacity began to increase, and Science developed rapidly. The scientific research of the technological problem in the field of industry is carried out. Science considerably approach in the technology. 　The invention of the mercury pump and the manufacture of the vacuum tubes led to the discovery of X-rays and the electron beam, and the opening of the 20th century technology and science comes. 　The progress of technology provided the conditions and subject necessary for scientific research. And the relations that the result of the scientific research is applied to the technological problem are established. The first framework of modern science was formed in this timedepartmental bulletin pape