上楼问题的数学模型及推广

上楼问题是一个经典名题,在我国中学数学教材和教参中它作为递推数列模型出现,同时出现在中学数学习题、考题和数学竞赛题中。对一般上楼问题作深入讨论后,用高等数学的方法找到了上楼问题的通项公式,并“用高于下”建立了中学数学模型,丰富了高中数学新课程资源。     

多层民宅楼梯照明系统设计

根据我国多层民居楼梯照明中存在的无照明、有照明无管理，有管理但有问题等情况，本提出了采用移位寄存器对楼梯照明系统进行自动化管理的思路，这一系统简单易行，在实际中使用有相当价值。     

一座坡地建筑室外台阶的设计

文章介绍了一座坡地建筑室外台阶的设计,探讨了如何将室外台阶与坡地建筑的特定环境结合起来进行设计,做到在满足台阶功能的同时,达到形式的美观。     

登楼梯能量消耗的测量与统计方法研究

目的:了解登楼梯能量消耗状况以及探讨能耗测量和计算方法.方法:30名受试者登12层楼(每级台阶高度16 cm,共204级台阶,垂直距离32.6 m),每位受试者以90步/min和100步/min的步频上下两次楼梯.在登楼梯过程中,通过便携式肺功能仪(德国CORTEX MgtaMax 3B)测量受试者的摄氧量、通气量、能耗、心率、呼吸商、氧脉搏等指标.结果:上下楼梯的能量消耗比是2.7;1;在一定步频范围内,随着步频的提高,能耗相应增加,两者呈线性关系.以90～100步/min上下楼梯可以代表日常登楼速度;以90～100步/min登12层楼的运动时间不到3 min,多数受试者的能耗、心率等生理指标经过快速上升期后进入稳定状态;登楼梯的能耗值有明显的年龄和性别差异,20岁组男性显著高于50岁组男性和20岁组女性;利用多项式回归建立的登楼梯能耗预测方程,能够准确反映日常爬不同楼层的能量消耗值.     

Kinematic characteristics of anterior cruciate ligament deficient knees with concomitant meniscus deficiency during ascending stairs

It is commonly believed that a torn ACL or a damaged meniscus may be associated with altered knee joint movements. The purpose of this study was to measure the tibiofemoral kinematics of ACL deficiency with concomitant meniscus deficiency. Unilateral knees of 28 ACL deficient participants were studied while ascending stairs. Among these patients, 6 had isolated ACL injuries (group I), 8 had combined ACL and medial meniscus injuries (group II), 8 had combined ACL and lateral meniscus injuries (group III) and 6 had combined ACL and medial-lateral meniscus injuries (group IV). Both knees were then scanned during a stair climb activity using single fluoroscopic image system. Knee kinematics were measured at 0°, 5°, 10°, 15°, 30° and 60° of flexion during ascending stairs. At 0°, 15° and 30° flexion of the knee, the tibia rotated externally by 13.9 ± 6.1°,13.8 ± 9.5° and 15.9 ± 9.8° in Group I. Group II and III exhibited decreased external rotation from 60° to full extension. Statistical differences were found in 0°, 15°and 30° of flexion for the 2 groups compared with Group I. In general, the tibia showed anterior translation with respect to the femur during ascending stairs. It was further determined that Group III had larger anterior translation compared with Group IV at 0° and 5° of flexion (?6.9 ± 1.7 mm vs. 6.2 ± 11.3 mm, P = 0.041; ?9.0 ± 1.8 mm vs. 8.1 ± 13.4 mm, P = 0.044). During ascending stairs the ACL deficient knee with different deficiencies in the meniscus will show significantly different kinematics compared with that of uninjured contralateral knee. Considering the varying effect of meniscus injuries on knee joint kinematics, future studies should concentrate on specific treatment of patients with combined ACL and meniscus injuries to protect the joint from abnormal kinematics and subsequent postoperative degeneration.     

利用函数的凹凸性证明一类三角不等式

通过给出关于凹凸函数的一个性质定理及其推论，对一些特定类型的三角不等式通过构造辅助函数，求出函数的二阶导数；再结合其凹凸性利用定理的推论给予简捷的证明，通过实例的证明可看出这种方法是非常简捷有效的。     

现浇楼梯施工缝预留及支模工法

介绍现浇楼梯施工缝预留及支模工法的特点、适用范围、工艺原理及施工工艺流程。     

采取跃层式设计实现小康型住宅优指标

为培养创新精神,本次课程设计中我们采取局部跃层式布局新式设计方案,有效地实现了建设部关于2000年小康型住宅新标准优指标,解决了住宅设计中的诸多弊端。     

现浇楼梯施工缝预留及支模工法

介绍现浇楼梯施工缝预留及支模工法的特点、适用范围、工艺原理及施工工艺流程。     

抛物线形旋转楼梯的内力分析与计算

曲线形旋转楼梯已被广泛应用，本文对于抛物线形旋转楼梯提出了一种内力计算方法，在进行必要的计算简化和假定后，在内力计算时，把固定坐标转化成动点坐标，推导内力计算公式，并应用高斯积分法编程计算，利用此方法能够简便的计算出各项内力值，便于设计。