陕西柞—山—商晚古生代拉分断陷盆地动力学与成矿作用

采用构造—岩相学和构造—热水沉积岩相填图研究,认为陕西柞水—山阳—商县(柞—山—商)晚古生代拉分盆地,在早古生代扬子板块北被动陆缘残余洋盆基础上,经历了志留纪—早泥盆世北秦岭岛弧造山带—残余洋盆转换过程。在中泥盆世演化为秦岭微板块北缘拉分断陷盆地,晚泥盆世叠加了深源碱性热流体叠加作用明显,形成了铁白云石钠质角砾岩相带,并发生了构造反转。石炭纪陆缘拉分盆地进一步发展演化为残余海盆萎缩封闭。这种造山带—沉积盆地—岛屿构造耦合与转换过程记录了由洋盆—岛弧碰撞造山转换为陆—陆碰撞造山过程。该拉分盆地中具有明显的区域成矿分带,与多期成矿成岩地质作用有关,在造山带—沉积盆地—岛屿构造耦合与转换中,中泥盆世柞—山—商拉分断陷盆地的四周被古陆块和造山带分隔,陆—陆碰撞过程驱动了造山带流体发生大规模排泄到该盆地内,在该拉分断陷盆地内形成了大规模热水沉积成岩成矿,各类热水沉积岩相发育。在该拉分盆地中,近东西向和北东向同生断裂作用形成了次级断陷盆地,为热水沉积成岩成矿提供了沉积容纳空间。热水沉积成因的银多金属—重晶石—菱铁矿矿床定位于三级和四级热水洼地。晚泥盆世—石炭纪近南北向的岩石圈地幔收缩,陆—陆碰撞收缩成为垂向热传输主要驱动力源,导致了陆壳尺度上碱性热流体被挤压垂向排出到陆表残余海盆之中,本区脉状富金镍钴铜矿与晚泥盆世—石炭纪深源碱性热流体隐爆作用形成的碱性铁白云石钠质角砾岩带密切有关。类卡林型金矿定位于该盆地上部基底构造层和盆地热水浊流沉积相内,主要与后期脆韧性剪切带有密切关系。

Treatable focal region modulated by double excitation signal superimposition to realize platform temperature distribution during transcranial brain tumor therapy with high-intensity focused ultrasound

Recently, the phase compensation technique has allowed the ultrasound to propagate through the skull and focus into the brain. However, the temperature evolution during treatment is hard to control to achieve effective treatment and avoid over-high temperature. Proposed in this paper is a method to modulate the temperature distribution in the focal region. It superimposes two signals which focus on two preset different targets with a certain distance. Then the temperature distribution is modulated by changing triggering time delay and amplitudes of the two signals. The simulation model is established based on an 82-element transducer and computed tomography （CT） data of a volunteer＇s head. A finite- difference time-domain （FDTD） method is used to calculate the temperature distributions. The results show that when the distances between the two targets respectively are 7.5-12.5 mm on the acoustic axis and 2.0-3.0 mm in the direction perpendicular to the acoustic axis, a focal region with a uniform temperature distribution （64-65 ℃） can be created. Moreover, the volume of the focal region formed by one irradiation can be adjusted （26.8-266.7 mm3） along with the uniform temperature distribution. This method may ensure the safety and efficacy of HIFU brain tumor therapy.

基于叠加效应的法学教育课程体系优化研究

"课程+实践+训练"联动的能力叠加效应有利于地方院校法科人才培养模式的革新。以中国法治理论为指导,优化法学专业课程体系以实现培养"合格人才"的目标;以"立体化"教学和"一体化"技能训练等手段将法科生能力培养所需要的结构要素链接起来的课程体系,有利于实现多专业知识的融通,育成法科人才的特有"技术性",提升法科生的综合能力。

四态叠加多模叠加态光场|Ψ_e^((4)),Ⅲ〉_q的等阶N次方Y压缩

根据量子力学的线性叠加原理 ,构造了由多模偶相干态与多模虚偶相干态组成的第 种四态叠加多模叠加态光场态 |Ψ(4)e , 〉q的等阶 N次方 Y压缩特性 .结果发现 :1 )当压缩阶数 N=4m,( m=1 ,2 ,3 ,… )时 ,态 |Ψ(4)e , 〉q 恒处于等阶数 N-Y最小测不准态 ;2 )当压缩阶数 N =4m′+2 ,( m′=0 ,1 ,2 ,… )时 ,在 (θ1-θ2 ) ,q,Rj,r1,r2 等取不同的组合定值下 ,态|Ψ(4)e , 〉q可分别呈现出等阶 N次方 Y压缩效应与“半相干态”效应 ;3 )当压缩阶数 N为奇数时 ,在 (θ1-θ2 ) ,q,Rj,r1,r2 等取不同的组合定值下 ,态 |Ψ(4)e , 〉q 可呈现出等阶 N次方