The Vena Cava Filters market in China is growing at a steady rate. The Retrievable Vena Cava Filters segment is one of the fastest growing segments in the Vena Cava Filters market in China.The overall market is currently witnessing the introduction of developed products with new technologies. Many regional vendors are competing to increase their market shares in China. B. Braun Melsungen AG is considered to be the market leader in the Vena Cava Filters market China. The Vena Cava Filters market in China is expected to grow at a CAGR of 12.5 percent over the period 2011–2015.

The Stent Grafts market in China is growing at a steady rate. Many regional vendors are competing to increase their market share in China. Medtronic Inc. is considered as the market leader in the Stent Grafts market in China. This market is witnessing the development of advanced technologies each year. The TAA Stent Graft segment is one of the fastest growing segments in the Stent Grafts market in China. Moreover, due to the increase in the number of aged population suffering from AAAs and TAAs, the market is expected to grow at a CAGR of 18 percent over the period 2011–2015.

2013年一季度机械工业延续了去年以来微弱回升，预计全年也将呈温和回升之势，运行态势将以“平稳”为基本特征。工业总产值：1-2月机械工业累计完成工业总产值2.65万亿元，同比增长13.11%，比去年同期（11.62%）提高1.49个百分点；比去年全年（12.64%）提高0.47个百分点。

行业预测：需求提升—2013年高粮价与农业补贴政策将继续带动我国农资需求增大。我国粮食刚性需求总体增加，粮食供需缺口不断扩大，2012年较2001年我国玉米、大豆进口量增长20 倍、8倍。为促进我国粮食农业稳定发展，保障我国粮食安全和供求平衡，我国不断扩大农资补助，2012年农业补贴为2006年的6倍，预计未来我国将继续加大对农业的补贴力度，扩大农资需求，增加农民收益。

The Medical Device market in China is the second largest in Asia, behind Japan. The market is experiencing an increase in per capita healthcare expenditure and, coupled with health reforms and insurance reforms, this is expected to boost the growth of the market. The market is expected to witness an improvement in its growth rate and post a CAGR of 16.5 percent for the period 2011–2015.

1-4月机械工业运行总体保持平稳，运营状况略有改善。一是1-3月主要财务经济指标中，主营业务收入、实现利润、税金总额增长均有所回升；二是利润增长中汽车仍是带动全行业利润增长的主要力量；三是财务费用、利息支出增幅比上年大幅回落；流动资产周转率同比加快0.03次；但值得关注的是：1-3月机械工业主营业务收入、实现利润、工业增加值增速均低于全国工业增速，机械工业重点联系企业又低于全行业增速；订货形势没有明显改观，机械工业重点联系企业累计订货仍呈现微弱增长态势；产品价格指数低位徘徊；固定资产投资增速仍低于制造业、低于全社会投资增速。机械工业固定资产投资增速的回落，以及库存、库存中的产成品持续低速运行，反映出未来行业运行走势不会出现大幅增长，未来行业经济运行态势将以“平稳”为基本特征。

本文简单阐述了变频调速原理及特点，并通过变频调速技术在各种离心式风机、油泵、水泵及气体压缩机等石油生产设备上的应用介绍，阐明利用变频调速器来调整石油生产与炼制中的工艺参数，在满足生产需要的同时，还可以降耗、节电、保质、增产及减少有害气体排量，提高企业生产效益和社会经济效益。