| 今年美国签证形势整体开始发生转变，敏感专业的审查周期从以前的长达两个月缩短到2~3周，且因专业审查而遭遇申请失败的人数极少。但是，如果申请者所学的专业属于敏感专业，为了能按时到达学校，一定要提早向所在辖区的大使馆或者领事馆申请签证。 美国留学 敏感专业详细列表 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 C. ROCKET SYSTEMS (including ballistic missile systems,space launch vehicles and sounding rockets) and Unmanned Air Vehicles (UAV) (including cruise missiles, target drones, and reconnaissance drones): Technologies associated with rocket systems and UAV systems. The technology needed to develop a satellite launch vehicle is virtually identical to that needed to build a ballistic missile. D. ROCKET SYSTEM AND UNMANNED AIR VEHICLE (UAV) SUBSYSTEMS: Propulsion technologies include solid rocket motor stages,and liquid propellant engines. Other critical subsystems include re-entry vehicles, guidance sets, thrust vector controls and warhead safing, arming and fusing. Many of these technologies are dual-use. Technologies include: -- Liquid and solid rocket propulsion systems -- Missile propulsion and systems integration -- Individual rocket stages or staging/separation mechanism -- Aerospace thermal (such as superalloys) and high-performance structures -- Propulsion systems test facilities |
