いた。鎖の両端をそれぞれ A と B ,また A から x 離れた点を P とする。 B を力 F で水平に引っ張ると全体が加速度 a で動いた。
19-1. 運動の様子を図示せよ。点 P における鎖の張力を S とする。 【解答】右図の通り。図の S は, A ∼ P 部分を右に引く張力である。もちろ ん実際には P で鎖はくっついているが, S が A ∼ P 部分に働くことを明らか にするため少し離して書いた。図の左向きの力は, S の反作用であり, P ∼ B 部分を左に引いている。
2 Faculty of Humanity and Environment, Hosei University, Fujimi2-17-1, Chiyoda-ku, Tokyo
102-8160, Japan
3 School of Agriculture, Hokkaido University, Kita9 Nishi9, Kita-ku, Sapporo, 060-8589, Japan
Hokkaido is the northernmost island among Japan’s four main islands, situated between the northern limit of the cool temperate zone and the southern limit of the boreal zone. Its climate facilitates the formation of various types of wetlands, majority of which are peat-forming mires. Most of these wetlands were found in their natural state until the early 20th century. However, since then, drainage and subsequent conversion mainly to agricultural land have destroyed more than 70% of this area. In 1996, there were a total of 150 wetlands greater than 1 ha, totaling an area of 59,881 ha. According to the Geographical Survey Institute, they covered 86% of the remaining wetlands in Japan. In 1928, when many mires were undeveloped, they spanned a total area of 200,642 ha. Mire areas were mainly lost between the 1950s and 1970s, when post-war development promoted agricultural and large-scale reclamation projects. Many wetland areas have been designated as national or prefectural parks. However, the assignment of the protected area status alone does not reduce external pressures on the wetlands. Currently, 90.7% of mountain mires are public land, whereas 81.3% of lowland mires are held privately or in mixed ownership. This ownership condition affects the possibility to ensure complete protection of mire complexes, especially in the lowlands. To ensure effective conservation of mire ecosystems, it is necessary to include the catchment area in the planning of protected areas. According to the Hokkaido mire database on vascular plants (under construction), 1024 plant species were recorded, among which 116 species are red data plants in Japan. Because most of them have wetland habitats, environmental degradation is likely to result in their extinction.
問題 24. 一様重力の下にある理想気体の平衡状態を古典近似のもとで調べる。位置座標を r = (x, y, z) とし,
0 ≤ x ≤ L, 0 ≤ y ≤ L, 0 ≤ z ≤ H (4.18)
を満たす体積 V = L 2 H の箱に閉じ込められた質量 m の単原子分子を考える。それぞれの粒子間に相互作用 はなく,ポテンシャル
✎ この平面が xy 平面になるように座標系を選べ。
7-4. 同様に角運動量が保存する場合、質点の速度の z 成分 v z が 0 になることを示せ。
7-5. 右図のように、時刻 t で r にあった質点 m が、時刻 (t + t) に r + r に進んだ。時刻 t での速度を
v として面積速度を求めよ。
) での速度すなわち終端速度 v ∞ と, y ∞ (t) を求めよ *2 。
1-7. v y (t) と y(t) を t の関数としてグラフで表せ。
1-8. kt ≪ 1 の場合, v y (t) と y(t) がそれぞれ下のように展開できることを確認せよ。
v y (t) = (v 0 − gt) − k(v 0 t −
(the page with seals of the Mayor of Kyoto City and the prefectural governor)] OR + a certificate of safe+ keeping of the above+mentioned certificate.. A life style is unstable due to [r]
〔問3〕 次の⑴∼⑶の文を 本文の内容と合うように完成するには の中に それぞれ下のどれを入れるのがよいか。
⑴ One day,af t er cl as s es ,Nobuyuki was ver y happy becaus e . ア Mr .Yokoyama cal l ed hi s name as a wi nner of a pr i ze i n t he cont es t イ Mr .Yokoyama gave hi m a l et t er f r om t he of f i ce of t he ar t cont es t ウ Mr .Yokoyama t hought t hat i t was gr eat f or hi m t o get a pr i ze エ Mr .Yokoyama became an advi s or t o t he Ar t Cl ub
1935: un anno difficile per le relazioni nippo-italiane, ma fecondo per lo scambio letterario
Andremo a indagare quell’anno teso e intenso in cui, mentre i rapporti tra Italia e Giappone subivano una brusca involuzione per via della Guerra d’Etiopia, l’uscita di tre antologie poetiche ravvivava lo scambio intellettuale fra i due paesi: Poesie giapponesi d’oggi di Lionello Fiumi e Kuni Matsuo, Vento di Greco. Le poesie tradotte d’Itaia di Hayato Kumabe, Venti e ombre. Antologia della poesia moderna italiana di Eisai Akiyoshi (Akira Tsubouchi).