A pseudoconservation law for a time-limited service polling system with structured batch poisson arrivals

AbstractWe consider a cyclic-service queueing system (polling system) with time-limited service, in which the length of a service period for each queue is controlled by a timer, i.e., the server serves customers until the timer expires or the queue becomes empty, whichever occurs first, and then proceeds to the next queue. The customer whose service is interrupted due to the timer expiration is attended according to the nonpreemptive service discipline. For the cyclic-service system with structured batch Poisson arrivals (Mx/G/1) and an exponential timer, we derive a pseudoconservation law and an exact mean waiting time formula for the symmetric system

Transport Properties of Steam Curing Concrete Using Mineral Admixtures

Steam curing has been used widely in the precast concrete industry. However, investigations on steam curing concrete focused mainly on their strength development. Research on durability of steam curing concrete, particularly on mixes using mineral admixtures, is somewhat limited. In this study, transport properties and mechanical properties of concretes using mineral admixtures under different steam curing conditions were measured. Normal Portland cement, high early strength Portland cement, ground granulated blast-furnace slag and fly ash were used. Steam curing conditions were varied by changing the preliminary curing time, temperature drop rate and curing method after steam curing. Transport properties, such as oxygen gas diffusion coefficient and water diffusion coefficient were measured. Moreover, mechanical properties, such as compressive strength, static elastic modulus and dynamic elastic modulus were measured. From the experimental result, the degree of the influence that the differences in steam curing conditions give to transport properties varies according to the types of binder. It was confirmed that transport properties might decrease remarkably in comparison with the case of a standard steam curing condition

ミンダイ シュコウ デルタ ノ シュウゾク ゾクフ コセキ イチシュウゾク ヲ メグル ゲンセツ ト シジツ

井上徹, 遠藤隆俊編『宋-明宗族の研究

Changes in Carotenoid Pattern during Development of Gardenia Fruit

クチナシ果実中の主要色素であるクロシン(crocin:Digentiobiosyl 8,8’-diapocarotene-8,8'-dioate)の生合成についての知見を得ることを目的として,クチナシ果実の結実から完熟に至るまでの各発育段階におけるカロテノイド色素の含有量とその組成の変化を調べ,次の結果を得た. (1)肥大成長過程のクチナシ果実には殆どカロテノイド色素が認められず,成熟過程の開始後から生合成が始まり,完熟期にかけて急激な蓄積が起こった.そして,完熟期の乾燥果実は450mg%のカロテノイド色素を有していた. (2)成熟過程の何れの段階の果実にもβ-カロテンなどのC40-カロテノイドは少量しか含まれておらず,カロテノイド色素の大部分がクロシンを代表とするクロセチン(crocetin:8,8'-Diapocarotene-8,8'-dloic acid)の誘導体であった.そして,これらのクロセチン誘導体は何れも糖エステルであると推察された. (3)クチナシ果実の発育に伴うカロテノイド組成の変化を調べた結果から,クロセチン誘導体の幾つかは,クロシン生合成の中間前駆体であることが予想された