摘要：The optimization design of the parameters, such as the groove depth, groove number, ratio of the groove width to the land width, and spiral angle of a new kind of double spiral grooves face seal, which works under the condition of high velocity, high sealing pressure and ultra-low temperature, is presented under the assump-tion of fixed closure force by finite element analysis method. The results show that the stiffness of the maximum film can be obtained when the ratio of the groove width to the land width is 0.5 and the spiral angle is about 75 degrees, when the influence of the groove number on the sealing performance is not obvious.

摘要：In this article, the performance and applications of a spiral Plate Heat Exchanger are demonstrated. Also, governing equation of heat transfer phenomena in such heat exchangers is discussed. Regarding the governing equations, a LAB-sized model of this type of heat exchanger was designed and constructed. Galvanized Iron sheets were used as the heat transfer surfaces. Two Galvanized Iron sheets were rolled together around a central core and, as a result, two separated channels were made. Also, a predesign simulation of the heat exchanger was done using the Fluent software to predict the performance of the heat exchanger. First the geometry was made using Gambit software environment then the model was analyzed through Fluent. Because of less fouling, easier cleaning and high heat transfer coefficient, spiral Heat Exchanger is a good alternative to the other types of heat exchangers, especially when it’s going to handle high fouling flows or highly viscous fluids. Low fouling rate of the heat exchanger, reduces the need of cleaning and therefore the out of service will be decreased. In the constructed heat exchanger, Nusselt number increases as the mass flow rate increases. Average Nusselt number is about 100 that is very good.

摘要：鉴于当下高校《计算机程序设计》课程中出现的诸多问题,以往的常规教改在实际应用中的不适应性,从教与学两方面分别构建相应模型的方法尝试新的教改思路,具体在教授方面采用spiral螺旋上升式循环教学模型,而在学习方面采用Big Six自主学习模式,经过教育测量与统计评价实际证明了该教学改革的可行性和有效性。

摘要：详细介绍了一种螺旋线型μs量级高压长脉冲形成线的设计方案,率先将螺旋线的结构形式应用于μs量级高压长脉冲发生器设计。形成线的内导体为螺旋线,工作介质为去离子水,形成线的等效电容为41.25 nF,等效电感为6.06μH,特性阻抗为12.1Ω,输出脉冲宽度1μs,最高充电电压1 MV,最大储能20.6kJ,匹配状态下输出电压约500 kV。设计结果表明:与采用传统的单筒直线结构相比,在获取同等脉冲宽度的条件下,采用螺旋线结构可使脉冲形成线的长度缩短75%左右。

摘要：以(?)文彦之作品spiral为 分析对象,在立体主义艺术视野中, 探讨了与绘画革新理念相关的建筑 学理论。

摘要：This paper presents a new design of complementary oxide semiconductor voltage controlled oscillator (CMOS VCO) for improve tuning range and phase noise with low power consumption. Design is area efficient and easy to implement. Design is carried out in cadence and schematic editor using 180 nm technology. Simulation is done and performance results are reported. Results have been compared with earlier published work and improvements are obtained in this work.

摘要：In this paper, an attempt has been made to produce a recipient system of wireless charge for a simple hearing aid so that electrical signal would be generated through detecting and receiving radio frequency waves (RF). The purpose of this design is to receive wireless charge for hearing aids and basically for any electronic device which is not required to a high energy for being setup. In this study, it has been demonstrated that as the amount of radio receiving energy increases, distance of receiver from antenna should be decreased;otherwise, either maximum amount of the receiving energy, or signal power density of the transmitter should be increased. Since it is impossible to be performed, it is decided to set up an energy receiving system constructed by rectenna and charge Circuit and to adjust their parameters to provide energy requirements for a device with low-power consumption. In this paper, different components of an energy receiving system from radio frequency band have been mentioned and a diagram block has been suggested. Subsequently, input impedance of designed antenna has been adjusted by provided relations. This impedance should be adjusted with the total impedance of regarded hearing aid Circuit by which the highest amount of received signal power is transferred to the battery of hearing aids. Received signal is converted to a dc voltage by rectifier diode. Finally, by applying a voltage regulator which has been designed using a common-collector amplifier not only the output voltage is kept constant, but the power is also strengthened. The battery of the hearing aids will be charged using the obtained power and voltage.

摘要：针对蜗壳结构安全是确保大型水电机组稳定运行的关键,通过简化算法对糯扎渡大型水电站蜗壳结构进行了三维有限元分析。计算结果表明,蜗壳结构各截面最大拉应力值出现于蜗壳顶部混凝土处,钢蜗壳选用充水保压浇筑外围混凝土的埋置方式合理、有效可行,可为蜗壳结构设计与施工提供参考。

摘要："出品建筑"设计螺旋观景塔"出品建筑事务所"(Doarchi)在距离深圳不远的地方,设计了一个螺旋观景塔,塔的楼梯螺旋810°,在塔顶可以俯瞰附近的群山。这座建筑被称为螺旋塔(Tower of spiral),环绕着一个小水池,池水用来灌溉附近的田地。塔的底部被草地、向日葵地和远处的群山环绕,通过一条蜿蜒铺设的小路到达。游客可以通过一组弯曲的浅阶梯上升15m,终点是一个由低矮护栏包围的了望台。