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Shigeru MORITA Motoshi GOTO Kenichi NAGAOKA Chunfeng DONG Hangyu ZHOU Zhengying CUI Yunbo DONG Xiang GAO Katsumi IDA Katsunori IKEDA Osamu KANEKO Shiyao LIN Haruhisa NAKANO Masaki OSAKABE 《等离子体科学和技术》2011,13(3):290-296
A cylindrical carbon pellet with a size of 1.2L?1.2? to 1.8L?1.8?mm and a velocity of 100 to 300 m/s was injected into Large Helical Device (LHD) for an efficient fueling based on its deeper deposition instead of hydrogen gas puffing and ice pellet injection. Electron density increment of ?ne=1014cm-3 is successfully obtained by single carbon pellet injection without plasma collapse. Typical density and temperature of the ablation plasma of the carbon pellet, e.g., 6.5x1016cm-3 and 2.5eV for CII, are examined respectively by spectroscopic method. A confinement improvement up to 50% compared to ISS-95 stellarator scaling is clearly observed in a relatively low-density regime of ne=2 to 4?1013cm-3, and high ion temperature Ti(0) of about 6keV is also observed with an internal transport barrier at ne=1.2?1013cm-3. In particular, the improvement in the ion temperature largely exceeds that observed in hydrogen gas- puffed discharges, which typically ranges below 3 keV. 相似文献
13.
Abstracts are not published in this journal
This revised version was published online in November 2006 with corrections to the Cover Date. 相似文献
14.
K. TSUMORI Y. TAKEIRI K. NAGAOKA K. IKEDA M. OSAKABE Y. OKA O. KANEKO M. SHIBUYA T. KONDO M. SATO E. ASANO 《等离子体科学和技术》2006,8(1):24-27
The results on high power injection with the ueutral bean, injection (NBI) system for the Large Helical Device (LHD) are reported. The system consists of three beam-lines with two hydrogen negative ion (H^- ion) sources installed in each beam-line. In order to improve the injection power, a new beam accelerator with a multi-slot grounded grid (MSGG) has been developed and applied to one beam-line. Using the accelerator, a maximum power of 5.7 MW was achieved in 2003 and 2004, and the maximum energy of 189 keV was reached. The power and energy exceeded the design values of the individual beam-line for LHD. The other beam-lines also increased their injection power up to about 4 MW, and the total injection power of 13.1 MW was achieved with three beam-llnes in 2003. Although the accelerator had an advantage in high power beam injection, extracted beams expand in the short side direction of the ground-grid slot. The disadvantage has been resolved by modifying the aperture shapes of the steering grid. 相似文献
15.
RHEOLOGY, FOOD TEXTURE AND MASTICATION 总被引:2,自引:1,他引:1
KATSUYOSHI NISHINARI 《Journal of texture studies》2004,35(2):113-124
16.
掺杂Fe^2+,Bi^3+,Cu^2+的PZT陶瓷低温烧结 总被引:5,自引:0,他引:5
在利用水热法合成的粉体低温烧结PZT「pb(Zr0.53TiO0.47)O3」陶瓷中,掺杂了FeA^2+、Bi^2+,Cu^2+等无机化合物,使PZT陶瓷在850℃温度下即可烧成,密度可达理论值98%,压电性能测定表明,其Kp值变化不大,而Qm值有较大提高。 相似文献
17.
SATORU TAMAKI KAZUKI GANAHA RYOJI OSHIRO EIJI KANEKO 《Electrical Engineering in Japan》2016,197(3):29-38
When the contacts of circuit breaker are opened just before current zero, the gap between contacts will still be very short. Therefore, it cannot withstand recovery voltage between the contacts. In such a case, multiple reignition is likely to take place. Many investigators had tried to clarify this phenomenon, and many reports have been published. However, high‐frequency current interruption and dielectric recovery characteristics are related to some parameters (value of current, arc time, and so on). In addition, arc phenomenon has also been implicated. Hence, it is difficult to understand this phenomenon accurately. In this paper, we conducted dielectric recovery test and high‐frequency current interruption test. Further, we conducted observation experiment using vacuum chamber in order to investigate the effect of small dc current. At the end, we calculated plasma density in the electrodes after high‐frequency current interruption by considering the result of observation experiment and dielectric recovery test. 相似文献
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19.
Stress relaxation and dynamic measurements were carried out on κ-carrageenan and agarose gels to examine the effect of alkali metal ions. The elastic modulus of κ-carrageenan gels increase remarkably by adding alkali metal ions Li+ , Na+ , K+ , Cs+ . This was explained as follows: the electrostatic repulsion of sulfate groups in κ-carrageenan gels are prevented by the shielding action of the alkali metal ions stabilizing the double helical structure of κ-carrageenan gels. The increase of the modulus was in the order: Cs+ > K+ ≫ Na+ > Li+ . The difference between these two groups (Cs+ , K+ ) and (Na+ , Li+ ) is that the former group belongs to the structure disordering ions while the latter group belongs to the structure ordering ions. Thus, the former group prevents the repulsion of sulfate groups more directly than the latter. Agarose gel, which lacks sulfate groups, is not influenced so much by adding the alkali metal ions. 相似文献
20.
HYPOTENSIVE ACTIVITY OF MUSCLE PROTEIN AND GLUTEN HYDROLYSATES OBTAINED BY PROTEASE TREATMENT 总被引:1,自引:0,他引:1
AI SAIGA KEIKO KANDA ZHENG WEI TOMOYUKI OKUMURA TOSHIYUKI KANEKO TOSHIHIDE NISHIMURA 《Journal of Food Biochemistry》2002,26(5):391-401
Protein hydrolysates obtained by treatment with papain, trypsin, chymotrypsin and actinase all exhibited inhibitory activity (IC50: 3.4–41.8 mg%) toward angiotensin‐converting enzyme (ACE) (EC 3.4.15.1). In particular, the protein hydrolysate obtained by treatment with papain showed the highest inhibitory activity (3.7–5.3 mg%). The ACE inhibitory activity of the gluten hydrolysate obtained with actinase was mainly due to peptides of less than 500 Da in molecular mass. On the other hand, the ACE inhibitory activity of the myofibrillar protein hydrolysate obtained with papain was due to peptides of both less and more than 500 Da in molecular mass. The blood pressure of spontaneously hypertensive rats (SHR) administered the myofibrillar protein hydrolysate was significantly reduced at 2 h after administration. The blood pressure of SHR was also reduced at 2 h after administration of the gluten hydrolysate, and this effect continued until 6 h. These hydrolysates may potentially be useful as antihypertensive food materials. 相似文献