Dynamic slider showing only 1 image

I'm doing a dynamic site in php. I have a section 'News & Events' which is a slider . The news can be added from the backend. The problem is that when i add news/event from the backend, only 1 event is shown on the screen. This is my html code:

<div id="portfolio" class="portfolio"><h3 class="wthree_title_agile" ><span  style="color:#5a0c4d">L</span>atest Updates </h3>
       
         <?php    
		              
                   
require_once("admin/config/connection.php");
//$psize="";
//$proicode="";
//$probarcode="";
$nname="";
//$proitems="";
$nid="";
$query1="select * from news_tb";
$resource1=mysql_query($query1,$connection);
$result1="";

$id="";
while($record=mysql_fetch_array($resource1))
{
	
  
           $nid=$record['nid'];
		   $nimg="uploadsn/".$record['nimg'];
		   $nname=$record['nname'];
		    $result1.="<ul id='flexiselDemo1'>
		  <li>
		  <div class='w3_agile_portfolio_grid'>
                    <img src='$nimg' alt=' ' class='img-responsive' >
					
                               <div id='tex'>
                               $nname</div>
								 
							</div>	
                          </li>      
                      </ul>";
}

		   ?>
		<div class="carousel-inner ">
            <div class="item active">
                <div class="container-fluid  mrgn_less">
                    <div class="row"> 
                      
                       <div class="col-md-12  mrgn_less col_bg" style="padding-bottom:13px;;margin-bottom:1em">
                          <?php  echo $result1;?>
                       </div>
                        
                    </div>
                </div>            
            </div> 
               
		  </div>
	</div>

This is my table news_tbTable news_tb

This is my website. My website Only one news/event is shown. Can somebody help me with this?