Summary The effects of age and disability on valuations of health states used in deriving QALYs h... more Summary The effects of age and disability on valuations of health states used in deriving QALYs have not been examined. We compared the valuations of seven states of immobility and pain given by 88 subjects aged 20-89 years, and of various degrees of disability. They were ...
The national incidence of postoperative urinary retention (POUR), its risk factors, and associate... more The national incidence of postoperative urinary retention (POUR), its risk factors, and associated outcomes are not well understood.We identified patients under.
Most of the in-plant medium-voltage generators are grounded through resistors ranging from 200 to... more Most of the in-plant medium-voltage generators are grounded through resistors ranging from 200 to 400 A. In some unusual situations, the resistors may even be as high as 1200 A. Low-resistance grounding is a preferred choice for a medium-voltage power distribution system. However, extensive generator stator ground fault damages had been reported due to the prolonging generator neutral ground current, which would continue to flow even after the main and field breaker opened. This ground fault current could continue to flow for as long as 5 s depending on the generator open-circuit time constant . As a result, the higher the generator neutral current, would lead to the higher stator ground fault damages. An IEEE Working Group has recently completed its study and made recommendations for medium-voltage generator grounding in a multiple source industrial environment. Based on the considerations of transient overvoltage, ground fault damages, and ground fault protection, the working group suggests a few variations of grounding systems, which basically are low-resistance grounding systems during normal operating conditions, and the generator would be switched to a high-resistance grounded system from a normal low-resistance grounded system when a ground fault occurs in the generator stator. The purposes of this paper are: 1) to examine the generator transient over-voltage and currents under the low-resistance ground fault conditions, and also to evaluate their corresponding stator ground fault damages, and 2) to establish an acceptable maximum system ground fault level. For comparison purposes, three versions of low-resistance grounding systems have been considered and they are: a low-resistance grounding system with a neutral breaker at the generator (hereinafter called a "neutral breaker system"); a low-resistance grounding system with the generator neutral low resistor being switched to a high-resistor after a stator ground fault (hereinafter called a "hybrid system"); and a low-resistance grounding system similar to the current practice (hereinafter called a "traditional system"). The simulation study is conducted with the aid of the Electro Magnetic Transient Program. An experimental analog generator model is also used to verify the simulation results.
The purposes of This work are: 1) to examine the generator transient over-voltage and currents un... more The purposes of This work are: 1) to examine the generator transient over-voltage and currents under the low-resistance ground fault conditions, and also to evaluate their corresponding stator ground fault damages, and 2) to establish an acceptable maximum system ground fault level. For comparison purposes, three versions of low-resistance grounding systems have been considered and they are: a low-resistance grounding system with a neutral breaker at the generator (hereinafter called a "neutral breaker system"); a low-resistance grounding system with the generator neutral low resistor being switched to a high-resistor after a stator ground fault (hereinafter called a "hybrid system"); and a low-resistance grounding system similar to the current practice (hereinafter called a "traditional system"). The simulation study is conducted with the aid of the electro magnetic transient program (EMTP). An experimental analog generator model is also used to verify the simulation results.
Your multitenant container (CDB) contains two pluggable databases (PDB), HR_PDB and ACCOUNTS_PDB,... more Your multitenant container (CDB) contains two pluggable databases (PDB), HR_PDB and ACCOUNTS_PDB, both of which use the CDB tablespace. The temp file is called temp01.tmp. A user issues a query on a table on one of the PDBs and receives the following error: ERROR at line 1: ORA-01565: error in identifying file '/u01/app/oracle/oradata/CDB1/temp01.tmp' ORA-27037: unable to obtain file status Identify two ways to rectify the error.
Summary The effects of age and disability on valuations of health states used in deriving QALYs h... more Summary The effects of age and disability on valuations of health states used in deriving QALYs have not been examined. We compared the valuations of seven states of immobility and pain given by 88 subjects aged 20-89 years, and of various degrees of disability. They were ...
The national incidence of postoperative urinary retention (POUR), its risk factors, and associate... more The national incidence of postoperative urinary retention (POUR), its risk factors, and associated outcomes are not well understood.We identified patients under.
Most of the in-plant medium-voltage generators are grounded through resistors ranging from 200 to... more Most of the in-plant medium-voltage generators are grounded through resistors ranging from 200 to 400 A. In some unusual situations, the resistors may even be as high as 1200 A. Low-resistance grounding is a preferred choice for a medium-voltage power distribution system. However, extensive generator stator ground fault damages had been reported due to the prolonging generator neutral ground current, which would continue to flow even after the main and field breaker opened. This ground fault current could continue to flow for as long as 5 s depending on the generator open-circuit time constant . As a result, the higher the generator neutral current, would lead to the higher stator ground fault damages. An IEEE Working Group has recently completed its study and made recommendations for medium-voltage generator grounding in a multiple source industrial environment. Based on the considerations of transient overvoltage, ground fault damages, and ground fault protection, the working group suggests a few variations of grounding systems, which basically are low-resistance grounding systems during normal operating conditions, and the generator would be switched to a high-resistance grounded system from a normal low-resistance grounded system when a ground fault occurs in the generator stator. The purposes of this paper are: 1) to examine the generator transient over-voltage and currents under the low-resistance ground fault conditions, and also to evaluate their corresponding stator ground fault damages, and 2) to establish an acceptable maximum system ground fault level. For comparison purposes, three versions of low-resistance grounding systems have been considered and they are: a low-resistance grounding system with a neutral breaker at the generator (hereinafter called a "neutral breaker system"); a low-resistance grounding system with the generator neutral low resistor being switched to a high-resistor after a stator ground fault (hereinafter called a "hybrid system"); and a low-resistance grounding system similar to the current practice (hereinafter called a "traditional system"). The simulation study is conducted with the aid of the Electro Magnetic Transient Program. An experimental analog generator model is also used to verify the simulation results.
The purposes of This work are: 1) to examine the generator transient over-voltage and currents un... more The purposes of This work are: 1) to examine the generator transient over-voltage and currents under the low-resistance ground fault conditions, and also to evaluate their corresponding stator ground fault damages, and 2) to establish an acceptable maximum system ground fault level. For comparison purposes, three versions of low-resistance grounding systems have been considered and they are: a low-resistance grounding system with a neutral breaker at the generator (hereinafter called a "neutral breaker system"); a low-resistance grounding system with the generator neutral low resistor being switched to a high-resistor after a stator ground fault (hereinafter called a "hybrid system"); and a low-resistance grounding system similar to the current practice (hereinafter called a "traditional system"). The simulation study is conducted with the aid of the electro magnetic transient program (EMTP). An experimental analog generator model is also used to verify the simulation results.
Your multitenant container (CDB) contains two pluggable databases (PDB), HR_PDB and ACCOUNTS_PDB,... more Your multitenant container (CDB) contains two pluggable databases (PDB), HR_PDB and ACCOUNTS_PDB, both of which use the CDB tablespace. The temp file is called temp01.tmp. A user issues a query on a table on one of the PDBs and receives the following error: ERROR at line 1: ORA-01565: error in identifying file '/u01/app/oracle/oradata/CDB1/temp01.tmp' ORA-27037: unable to obtain file status Identify two ways to rectify the error.
Uploads
Papers by Alex Wu