diff --git a/ruoyi-ngtools/src/main/java/com/ruoyi/ngCalTools/controller/GasController.java b/ruoyi-ngtools/src/main/java/com/ruoyi/ngCalTools/controller/GasController.java
index 48634f9..983568c 100644
--- a/ruoyi-ngtools/src/main/java/com/ruoyi/ngCalTools/controller/GasController.java
+++ b/ruoyi-ngtools/src/main/java/com/ruoyi/ngCalTools/controller/GasController.java
@@ -48,7 +48,7 @@ return  tempPar;
     }
     public double SOS(GasProps gasProps) {
         // check if library is ready; initialize if necessary 
-        if (null == (detailService=new DetailService()) || null == (thermService=new ThermService())) {
+        if (null == (detailService=) || null == (thermService)) {
             NG_Cal_UnInit();
             NG_Cal_Init();
         }
@@ -81,7 +81,7 @@ return  tempPar;
         int i;
 
         //check objects for readiness; try to initialize if not 
-        if (null == (detailService=new DetailService()) || null == (thermService=new ThermService()))
+        if (null == (detailService=) || null == (thermService))
         {
             NG_Cal_UnInit();
 
@@ -146,7 +146,7 @@ return  tempPar;
     }
     public double Zcal(GasProps gasProps, double dPlenumVelocity)
     {
-        if (null == (detailService=new DetailService()) || null == (thermService=new ThermService()))
+        if (null == (detailService) || null == (thermService))
         {
             NG_Cal_UnInit();
             if (GasConstants.NG_Cal_INITIALIZED != NG_Cal_Init())