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Performance evaluation of the Russian SPT-100 thruster at NASA LeRC
NTRS Full-Text:
Click to View
 [PDF Size: 11.9 MB]
Author and Affiliation:
Sankovic, John M.(NASA Lewis Research Center, Cleveland, OH, United States);Hamley, John A.(NASA Lewis Research Center, Cleveland, OH, United States);Haag, Thomas W.(NASA Lewis Research Center, Cleveland, OH, United States)
Performance measurements of a Russian flight-model SPT-100 thruster were obtained as part of a comprehensive program to evaluate engineering issues pertinent to integration with Western spacecraft. Power processing was provided by a US Government developed laboratory power conditioner. When received the thruster had been subjected to only a few hours of acceptance testing by the manufacturer. Accumulated operating time during this study totalled 148 h and included operation of both cathodes. Cathode flow fraction was controlled both manually and using the flow splitter contained within the supplied xenon flow controller. Data were obtained at current levels ranging from 3 A to 5 A and thruster voltages ranging from 200 V to 300 V. Testing centered on the design power of 1.35 kW with a discharge current of 4.5 A. The effects of facility pressure on thruster operation were examined by varying the pressure via injection of xenon into the vacuum chamber. The facility pressure had a significant effect on thruster performance and stability at the conditions tested. Periods of current instabilities were noted throughout the testing period and became more frequent as testing progressed. Performance during periods of stability agreed with previous data obtained in Russian laboratories.
Publication Date:
Jan 01, 1994
Document ID:
(Acquired Dec 28, 1995)
Accession Number:
Subject Category:
SPACECRAFT PROPULSION AND POWER
Report/Patent Number:
NASA-TM-106401, E-8235, NAS 1.15:106401, IEPC-93-094
Document Type:
Conference Paper
Publisher Information:
United States
Meeting Information:
IEPC C 23 13-16 Sep. 1993; Seattle, WA; United States
Meeting Sponsor:
AIAA, AIDAA, DGLR, and JSASS
Contract/Grant/Task Num:
RTOP 506-42-31
Financial Sponsor:
NASA; United States
Organization Source:
NASA Lewis Research C Cleveland, OH, United States
Description:
25p; In English
Distribution Limits:
U P Unlimited
No Copyright
NASA Terms:
ELECTRIC CURRENT; ELECTRIC POTENTIAL; ELECTRIC ROCKET ENGINES; ENGINE TESTS; PERFORMANCE TESTS; PLASMA PROPULSION; PRESSURE EFFECTS; PROPULSION SYSTEM PERFORMANCE; XENON; CATHODES; GROUND TESTS; ROCKET EXHAUST; ROCKET THRUST; STABILITY; VACUUM CHAMBERS
Imprint And Other Notes:
Presented at the 23rd IEPC Conference, Seattle, WA, 13-16 Sep. 1993; sponsored by AIAA, AIDAA, DGLR, and JSASS
Loading...orarcle 11g 服务代表的分别是什么意思？_百度知道
orarcle 11g 服务代表的分别是什么意思？
OrarleORCLVSSWriterServiceOrarleDBConsoleorcl(已启动)OracleJobSchedulerORCLOracleMTSRecoveryService(已启动)OracleOraDb11g_home1ClrAgentOracleOraDb11g_home1TNSListener(已启...
Orarle ORCL VSS Writer ServiceOrarleDBConsoleorcl (已启动)OracleJobSchedulerORCLOracleMTSRecoveryService (已启动)OracleOraDb11g_home1ClrAgentOracleOraDb11g_home1TNSListener (已启动)OracleServiceORCL (已启动)以上是Oracle服务默认的情况，其中OracleJobSchedulerORCL启动类型为禁用，其余为手动，我想知道的是以上各个服务所表达的是什么意思？作用是什么？谢谢。
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（1）OracleServiceSID
　　数据库服务，这个服务会自动地启动和停止数据库。如果安装了一个数据库，它的缺省启动类型为自动。服务进程为ORACLE.EXE，参数文件initSID.ora，日志文件SIDALRT.log，控制台SVRMGRL.EXE、SQLPLUS.EXE。　　（2）OracleHOME_NAMETNSListener　　监听器服务，服务只有在数据库需要远程访问时才需要（无论是通过另外一台主机还是在本地通过 SQL*Net 网络协议都属于远程访问），不用这个服务就可以访问本地数据库，它的缺省启动类型为自动。服务进程为TNSLSNR.EXE，参数文件 Listener.ora，日志文件listener.log，控制台LSNRCTL.EXE，默认端口。　　（3）OracleHOME_NAMEAgent　　OEM代理服务，接收和响应来自OEM控制台的任务和事件请求，只有使用OEM管理数据库时才需要，它的缺省启动类型为自动。服务进程为DBSNMP.EXE，参数文件snmp_rw.ora，日志文件nmi.log，控制台LSNRCTL.EXE，默认端口1748。　　（4）OracleHOME_NAMEClientCache
　　名字缓存服务，服务缓存用于连接远程数据库的Oracle Names 数据。它的缺省启动类型是手动。然而，除非有一台Oracle Names 服务器，否则没有必要运行这个服务。服务进程为ONRSD.EXE，参数文件NAMES.ORA，日志文件ONRSD.LOG，控制台 NAMESCTL.EXE。　　（5）OracleHOME_NAMECMAdmin
　　连接管理服务，是构建Connection Manager服务器所用，只有服务器作为Connection Manager才需要，它的缺省启动类型是手动。服务进程为CMADMIN.EXE，参数文件CMAN.ORA，日志文件CMADM_PID.TRC，控制台CMCTL.EXE，默认端口1830。　　（6）OracleHOME_NAMECMan
　　连接网关服务，是构建Connection Manager服务器所用，只有服务器作为Connection Manager才需要，它的缺省启动类型是手动。服务进程为CMGW.EXE，参数文件CMAN.ORA，日志文件CMAN_PID.TRC，控制台 CMCTL.EXE，默认端口1630。　　（7）OracleHOME_NAMEDataGatherer　　性能包数据采集服务，除非使用Oracle Capacity Planner 和 Oracle Performance Manager，否则不需要启动，它的缺省启动类型是手动。服务进程为VPPDC.EXE，日志文件alert_dg.log，控制台 vppcntl.exe。　　（8）OracleHOME_NAMEHTTPServer　　Oracle 提供的WEB服务器，一般情况下我们只用它来访问Oracle Apache 目录下的Web 页面，比如说JSP 或者modplsql 页面。除非你使用它作为你的HTTP服务，否则不需要启动（若启动它会接管IIS的服务），它的缺省启动类型是手动。服务进程为APACHE.EXE，参数文件 httpd.conf，默认端口80。　　（9）OracleHOME_NAMEPagingServer　　通过一个使用调制解调器的数字传呼机或者电子邮件发出警告（没试过），它的缺省启动类型是手动。服务进程PAGNTSRV.EXE，日志文件paging.log。　　（10）OracleHOME_NAMENames　　Oracle Names服务，只有服务器作为Names Server才需要，它的缺省启动类型是手动。服务进程NAMES.EXE，参数文件NAMES.ORA，日志文件NAMES.LOG，控制台NAMESCTL.EXE，默认端口1575。　　（11）OracleSNMPPeerMasterAgent　　SNMP服务代理，用于支持SNMP的网管软件对服务器的管理，除非你使用网管工具监控数据库的情况，否则不需要启动，它的缺省启动类型是手动。服务进程为AGNTSVC.EXE，参数文件MASTER.CFG，默认端口161。　　（12）OracleSNMPPeerEncapsulater　　SNMP协议封装服务，用于SNMP协议转换，除非你使用一个不兼容的SNMP代理服务，否则不需要启动，它的缺省启动类型是手动。服务进程为ENCSVC.EXE，参数文件ENCAPS.CFG，默认端口1161。　　（13）OracleHOME_NAMEManagementServer　　OEM管理服务，使用OEM时需要，它的缺省启动类型是手动。服务进程为OMSNTSVR.EXE，日志文件oms.nohup。
jjhua网络搜索补充:
1.OracleDBConsoleorcl
oem控制台的服务进程
可以以网页形式进行DB管理，比如: ,再以sys登陆,就可以管理DB了
2.OracleJobSchedulerORCL
定时器的服务进程
3.OracleOraDb10g_home1iSQL*Plus
isql*plus的服务进程
同1, 可以以网页模式执行SQL文.
4.OracleServiceORCL
数据库服务进程
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