簽證有變 美國留學敏感專業詳細列表

今年美國簽證形勢整體開始發生轉變，敏感專業的審查周期從以前的長達兩個月縮短到2~3周，且因專業審查而遭遇申請失敗的人數極少。但是，如果申請者所學的專業屬於敏感專業，為了能按時到達學校，一定要提早向所在轄區的大使館或者領事館申請簽證。

　　　美國留學敏感專業詳細列表

　　The State Department maintains a Technical Alert List, also known as the sensitive major list, to guide their evaluation of visa submission.

　　Sorted by rate.

　　CRITICAL FIELDS LIST

　　A. CONVENTIONAL MUNITIONS: Technologies associated with:
　　――Warheads and other large caliber projectiles

　　――Reactive armor and warhead defeat systems

　　――Fusing and arming systems.

　　――Electronic countermeasures and systems

　　――New or novel explosives and formulations

　　――Automated explosive detection methods and equipment

　　B. NUCLEAR TECHNOLOGY: Technologies associated with

　　production and use of nuclear material for both peaceful and military applications. Included are technologies for:

　　――Enrichment of fissile material

　　――Reprocessing irradiated nuclear fuel to recover produced plutonium

　　――Production of heavy water for moderator material

　　――Plutonium and tritium handling

　　Also, certain associated technologies related to nuclear physics and/or nuclear engineering. Includes materials,equipment or technology associated with:

　　――Power reactors, breeder and production reactors

　　――Fissile or special nuclear materials

　　――Uranium enrichment, including gaseous diffusion,centrifuge, aerodynamic, chemical, Electromagnetic Isotopic Separation (EMIS), Laser Isotope Separation （LIS)

　　――Spent fuel reprocessing, plutonium, mixed oxide nuclear research

　　Inertial Confinement Fusion (ICF)

　　――Magnetic confinement fusion

　　――Laser fusion, high power lasers, plasma,

　　――Nuclear fuel fabrication including Mixed Oxide (uranium-plutonium) fuels (MOX)

　　――Heavy water production

　　――Tritium production and use

　　――Hardening technology