Results 71 to 80 of about 14,310 (214)
Design and manufacture of lightweight for spiral bevel gear with double pressure angles of mining reducer [PDF]
, 2014 矿用减速器的结构对整机轻量化影响很大,优化弧齿锥齿轮的结构尺寸能有效减少减速器齿轮、轴承座和箱壳的质量。针对矿用减速器的工作状况,提出在工作齿面采用大压力角,在非工作齿面采用标准压力角的非对称弧齿锥齿轮。对双压力角非对称弧齿锥齿轮的啮合传动原理、齿轮副齿面方程进行了推导,分析非对称设计对工作齿面压力角变化范围的影响,对减速器弧齿锥齿轮齿形进行计算,对比了对称和非对称弧齿锥齿轮主动轮和被动轮。设计并制造了非对称单面刀盘和双面刀盘,加工出双压力角非对称弧齿锥齿轮,通过解析法 ...
肖望强
core
A modulation recognition model driven by lightweight knowledge distillation in the complex number domain [PDF]
Deep learning models rely on a large number of training samples in the modulation recognition task. However, in actual scenarios, the signal samples are limited, especially in complex noise environments, where the model performance is restricted ...
GAO Shuo +3 more
core +1 more source
Lattice-based lightweight post quantum access authentication scheme for satellite network [PDF]
Aiming at the problems of quantum computing attacks, high authentication overhead and long interaction time in satellite network access authentication schemes, a lightweight post quantum access authentication scheme based on lattice for a satellite ...
HAN Zhenzhen +3 more
core +1 more source
Research on Lightweight Road-Target-Recognition Algorithm in Complex Environment [PDF]
Road-target recognition is a core technology used in intelligent transportation systems to solve urban congestion problems. However, existing algorithms exhibit unsatisfactory recognition performance in complex traffic environments, with numerous missed ...
LI Zhenlu, HUANG Wei, SUN Kai
core +1 more source
Shuitu Baochi Xuebao目的探讨坝上地区不同退化程度小叶杨蒸腾特征及其对气象因子的响应。方法以坝上地区不同退化程度小叶杨（Populus simonii）为研究对象，利用热扩散式边材液流探针技术对不同退化程度小叶杨的树干液流进行监测，并同步监测光合有效辐射（PAR）、降雨量（P）、气温（T）、风速（W）、饱和水汽压差（VPD）和相对湿度（RH）等气象因子，研究不同退化程度小叶杨蒸腾耗水规律及其与气象因子的关系。结果1）不同退化程度小叶杨生长季蒸腾速率呈昼高夜低的单峰型变化趋势 ...
黄羡, 余新晓, 贾国栋, 孙立博
doaj
Zhongshan Daxue xuebao. Yixue kexue ban, 2007 【目的】探讨血管紧张素Ⅱ受体拮抗剂伊贝沙坦对糖尿病大鼠心脏的保护作用及其相关机制。【方法】将30只Wistar大鼠随机分为正常对照组、糖尿病组和伊贝沙坦组3组,每组10只。造模后12周终止实验处死大鼠,取血、尿和心脏标本,测定尿量、体质量、心脏质量/体质量、血糖、糖化血红蛋白(HbA1c);测定血液和心脏组织的丙二醛(MDA)和超氧化物歧化酶(SOD)的活性;通过电镜观察心肌超微结构的变化。【结果】12周终止实验时糖尿病各组大鼠的尿量、心脏质量/体质量、血糖、HbA1c ...
钱孝贤 +6 more
doaj
Operation standardization evaluation method based on improved YOLOv8n for ship equipment disassembly and assembly [PDF]
ObjectivesThe standardization of ship engine room operations is a critical component of ship safety management. Therefore, the practical examination for crew members includes the disassembly and assembly of ship equipment as a key assessment item.
Chao WU +4 more
core +1 more source
Zhongguo shiyan zhenduanxue, 2008 目的探讨性激素变化与慢性肝病、肝癌发生发展的关系。方法应用放免分析法对128例慢性肝病(慢性肝炎92例、肝炎肝硬化23例、肝硬化并发肝癌13例血清中睾酮（T）、雌二醇（E2）和催乳素（PRL）等进行了测定。结果慢性肝炎重度、肝硬化、肝硬化并发肝癌各组血清T含量明显低于慢性肝炎轻度组及正常对照组（P0.05）,但是,随着慢性肝炎向肝硬化、肝癌进展,慢性肝炎重度、肝硬化、肝硬化并发肝癌各组血清E2/T、E2/PRL水平明显高于慢性肝炎轻度组及正常对照组 ...
陈永胜 +5 more
doaj