螺旋焊缝轨迹跟踪控制算法的分析与研究

分析和研究了超声波螺旋焊缝自动检测的轨迹跟踪控制算法。在对经典PID控制采用参数自整定算法、对模糊控制采用自调整因子算法的基础上,提出了一种新型复合控制算法。该算法结合了比例控制、模糊控制及PID控制,仿真结果表明,其具有响应速度快、超调量小、无静差等优点,提高了轨迹跟踪的实时性及精度。     

Do interest rate controls work? Evidence from Kenya

This paper reviews the impact of interest rate controls in Kenya, introduced in September 2016. The intent of the controls was to reduce the cost of borrowing, expand access to credit, and increase the return on savings. However, we find that the law on interest rate controls has had the opposite effect of what was intended. Specifically, it has led to a collapse of credit to micro‐, small‐, and medium‐sized enterprises; shrinking of the loan book of the small banks; and reduced financial intermediation. Because of their adverse effects on bank lending, we estimate that the interest rate controls have reduced economic growth by ¼–¾ percentage points on an annual basis. We also show that interest rate caps reduced the signaling effects of monetary policy. These suggest that (1) the adverse effects could largely be avoided if the ceiling was high enough to facilitate lending to higher‐risk borrowers and (2) alternative policies could be preferable to address concerns about the high cost of credit.     

Cordon Pricing and Land‐Use Regulation

This study explores the simultaneous imposition of cordon pricing and land‐use regulations in a continuous and closed monocentric city with homogeneous households. Results reveal the optimal level of a single cordon toll and its location and the optimal floor area ratio (FAR) regulation, clarifying what distortions remain in the existence of cordon pricing and FAR regulation. Among other results, this paper shows that, with an optimal cordon toll, FAR regulation should alternate between a minimum and a maximum regulation, both inside and outside the cordon line.     

商品混凝土现浇楼板裂缝成因及防治

商品混凝土生产是建筑工程一项意义重大的现代化生产形式,在实际施工中,经常会出现许多意想不到的新问题和新情况。文章对现浇楼板裂缝成因进行了探讨,并提出了防治措施。     

楼板开裂原因及防治措施

文章详细介绍了房屋建筑混凝土楼板开裂的现象及原因，针对开裂原因提出了具体的防治措施，供相关施工人员借鉴参考。     

气垛支架在急倾斜薄煤层中的应用

自移式气垛支架能根据不同的地质状况,将气垛支架作为薄煤层工作面的基本支护设备,提供相应的气垛支护工艺。自移式气垛支架是在原气垛支架基础上增加了自移装置,在充分利用气垛支架初撑力高、整体性好、伸缩比大、抗横向冲击载荷能力强、对顶底板比压低、稳定性高等特点的基础上,很好地解决了围岩控制的难题。     

商品混凝土现浇楼板裂缝成因及防治

商品混凝土生产是建筑工程一项意义重大的现代化生产形式,在实际施工中,经常会出现许多意想不到的新问题和新情况。文章对现浇楼板裂缝成因进行了探讨,并提出了防治措施。     

大河矿区下草坪矿段构造特征及其对煤层稳定性的影响

文章主要对矿区内的含煤地层特征、构造特征、构造对煤层影响等进行了认真地分析研究,认为本区的总体构造形态为向斜与背斜构成的复合构造,断层对煤层稳定性影响表现为中等,对煤层开采影响较大。这一研究为今后周边矿区地质勘探及煤炭开发提供了理论依据。     

确保BZS空腹复合楼板施工质量探析

通过对空腹复合无梁楼盖新技术的应用,在工程实例中采用PDCA循环质量管理,找出影响空腹复合楼板质量的主要问题,并展开原因分析,确定改进对策后实施,总结了空腹复合楼板的施工技术及施工经验。     

论建筑物防潮方法

建筑物地下室和不设地下室的首层地面因直接与地基相连，故在春天或雨季时常常“回潮”，给住户带来许多不便。建筑物的防潮有主动防潮和被动防潮。主动防潮是在设计之时，切断造成“回潮”的水源，使水汽不进入室内。被动防潮是指水汽已进入室内之后，采取措施使室内水份减少。本文认为主动防潮优于被动防潮，应以主动防潮为主，被动防潮为辅。