Hasil untuk "cs.CE"

L. A. Pautov, A. A. Agakhanov, V. Yu. Karpenko et al.

Uwe Happek, Anant Setlur

Abstract not Available.

E.V.D. van Loef, J. Glodo, W.M. Higgins et al.

G.H. Olsen, A.V. Cafiero

Michael Handel

G. Denk

D. Wisniewski, A. J. Wojtowicz, W. Drozdowski et al.

AbstractFor Abstract see ChemInform Abstract in Full Text.

Yusuke Nakabayashi, Yutaka Fujimoto, Masanori Koshimizu et al.

RH Bonami, CE Thurman, S Verma et al.

Bernice Mills, Raymond Mariella

Daniel D. S. Coupland, Brent S. Budden, Laura C. Stonehill

Βασίλειος Δρακόπουλος

J Neal-Kababick, CA Berry, CE Calloway et al.

R Gayasov, Y N Joshi

Y. Saitoh, B. Yotsombat, K. Mizuhashi et al.

We have developed a new technique for stable production of lanthanide negative ions in a cesium sputter ion source without damage to the ionizer. Lanthanide elements sticking to a cesium ionizer deteriorate an ionization efficiency of the ionizer because of their characteristics such as low vapor pressures and low work functions. We have resolved the problem to make a sputter cathode that has a predrilled double layer structure. Cerium oxide powder pressed in the cathode pellet was covered by tungsten and drilled. Using this cathode, we achieved smaller solid angle emission of the sputtered lanthanide elements from the bottom of the drilled hole, and most of them could pass through the center hole of the ionizer. As a result, damage to the ionizer decreased, and stable operation of the ion source was successfully achieved with a cerium oxide beam current of 600 nA for 24 h continuous operation. The technique was applied for production of other rare earth ions.

Jarek Glodo, Edgar V. D. van Loef, William M. Higgins et al.

LJ Gschwender, CE Snyder, L Nelson et al.

Military and commercial jet aircraft engines operate hotter than in the past to increase fuel efficiency. Also, advanced structural engine materials permit hotter burning, more efficient engines. These trends are expected to continue. Many current gas turbine engines experience oil system coking and other problems related to the limited thermal and oxidative stability of the conventional, ester-based gas turbine engine oils. This is because most engines operate on gas turbine oils limited to 150°C. The best current oils have a maximum operating temperature of about 200°C. We initiated a program to develop a new class of ester-based lubricants to meet current and future high-temperature requirements. The target temperature range of this new oil is −40°C to 232°C. Target requirements were established and communicated to industry. This paper presents those requirements and initial results on the most promising candidates.

J.M. Atlee, P.P. Dasiewicz, R. Kazman et al.