几种先天畸形胎儿胸腺的解剖及组织观察

目的:探讨先天畸形胎儿胸腺的解剖及组织学结构特征和不同畸形与胸腺的发育关系。方法:解剖观察胸腺的形态,常规取材,苏木精———伊红染色,光学显微镜下观察胸腺组织。结果:三类、10例先天畸形胎儿中,并、缺指畸形和联体畸形胎儿胸腺的大体形态和组织学观察无明显异常,无脑畸形胎儿胸腺的大体形态和组织学观察出现明显异常。结论:不同先天畸形对胎儿胸腺发育影响不一。     

先天性巨大房缺的外科治疗

目的:探讨巨大房缺手术治疗特殊性,提高巨大房缺的手术安全性和治疗效果。方法:通过对23例巨大房缺的手术治疗(其中常规体外循环下纠治17例、不停跳下纠治6例,补片修补17例、直接修补6例),对其术前诊断、病情和并发畸形的估计、手术方法和经验教训等进行总结分析。结果:22例手术顺利,治愈出院.仅1例围术期死亡;但发现术前心脏彩超对房缺的大小、分型、合并畸形的诊断等有一定的局限性,易于误诊、漏诊。结论:巨大房间隔缺损外科治疗疗效确实,安全性高,但应提高对其常常合并肺静脉异位引流的认识,以免造成手术困难、甚至发生危险。     

Treatment and follow-up of children with transient congenital hypothyroidism

Objective: To study the clinical therapy and prognosis in children with transient congenital hypothyroidism (CH).Methods: Fifty-seven children with CH diagnosed after neonatal screening were treated with low-dosage levothyroxine (L-T4).Follow-up evaluation included the determination of TT3, TT4 and TSH serum levels and the assessment of thyroid gland morphology, bone age, growth development and development quotients (DQ). A full check-up was performed at age 2, when the affected children first discontinued the L-T4 treatment for 1 month, and one year later. Development quotients were compared (16.25±3.87) μg/d. Mean duration of therapy was (28.09±9.56) months. No significant difference was found between study group and control group in the DQ test (average score (106.58± 14.40) vs (102.4±8.6), P＞0.05) and 96.49% of the CH children achieved a test score above 85. Bone age, 99mTc scans and ultrasonographic findings were all normal, and evaluation of physical development was normal too, as were the serum levels of TT3, TT4 and TSH after one year of follow-up. Conclusion: A L-T4 dosage of and physical development at age 2. So it is possible for CH children to stop taking medicine if their laboratory findings and physical development are all normal after regular treatment and 2～3 years of follow-up.     

Experimental study on transient behavior of semi-open two-phase thermosyphon

An experimental system was set up to measure the temperature, pressure, heat transfer rate and mass flow rate in a semi-open two-phase thermosyphon. The behaviors of a semi-open two-phase thermosyphon during startup, shutdown and lack of water were studied to get complete understanding of its thermal characteristics. The variation of wall temperature, heat-exchange condition and pressure fluctuations of semi-open two-phase thermosyphons showed that the startup of SOTPT needs about 60～70 min; the startup speed of SOTPT is determined by the startup speed of the condensation section; the average pressure in the heat pipe is equal to the environmental pressure usually; the shutdown of SOTPT needs about 30～50 min; a semi-open two-phase thermosyphon has good response to lack of water accident.     

Three-dimensional transient numerical simulation for intake process in the engine intake port-valve-cylinder system

This paper presents a KIVA-3 code based numerical model for three-dimensional transient intake flow in the intake port-valve-cylinder system of internal combustion engine using body-fitted technique, which can be used in numerical study on internal combustion engine with vertical and inclined valves, and has higher calculation precision. A numerical simulation (on the intake process of a two-valve engine with a semi-sphere combustion chamber and a radial intake port) is provided for analysis of the velocity field and pressure field of different plane at different crank angles. The results revealed the formation of the tumble motion, the evolution of flow field parameters and the variation of tumble ratios as important information for the design of engine intake system.     

201例先天畸形儿的遗传分析

分析了襄樊市201例先天畸形儿的疾病分类、发病的遗传因素和环境因素,提示了实行遗传优生咨询和产前诊断是预防先天畸形发生的必要措施。     

山阴县神经管畸形流行特征及因素分析

目的探索神经管畸形在本地的流行特征及影响因素,以及开展"削峰"工程的成就.方法对1987-2006年的出生缺陷监测资料的相关数据,采用χ2检验进行统计分析.结果县乡两级医疗机构在1987-2006年间畸形发生率为(4.81±0.65)‰.结论①开展"削峰"工程,采取口服斯利安、进行B超早期诊断、实施孕产妇系统管理等措施,可使神经管畸形的形成和出生机会减少;②神经管畸形的发生率城镇低于农村,男性低于女性;③孕早期病毒感染的胎儿较易发生神经管畸形,孕妇被动吸烟是导致胎儿神经管畸形的原因之一.     

Implications of Prelecture Material on Cognitive Load and Instructional Effectiveness in Cross‐Disciplinary IS Education: The Nexus of Benford's Law and SQL

For some time, there has been a call for cross‐disciplinary teaching within the business disciplines. With the rise of data and analytics, there is an opportunity for cross‐disciplinary teaching by integrating technology throughout the business curriculum. However, many business professors have little experience in cross‐disciplinary teaching. We hope to rectify this by introducing an approach that uses prelecture material to prepare students for learning concepts and terms that are not core to the focal class. In a study that combines Structured Query Language (SQL) coding with an audit principle called Benford's Law, we analyze the impact of adding prelecture material about Benford's Law on student's cognitive load, knowledge gained, and instructional efficiency. Results indicate that students who received a prelecture on Benford's Law outperformed the control group in performance measures related to Benford's Law, and that the instructional efficiency on Benford's Law was also higher for the treatment group. We did not find any significant differences in cognitive load between the two groups, nor did the treatment group perform significantly better when tested on the SQL concepts. We conclude that cross‐discipline teaching is a fine balance between each discipline and communicating to students the importance of both disciplines is key.     

一种求解二阶电路暂态过程的降阶方法

给出了求解二阶电路暂态过程的降阶方法．该方法是一种数学上严格、要求的数学准备知识不多、物理概念明确的方法．     

Three-dimensional transient numerical simulation for intake process in the engine intake port-valve-cylinder system

INTRODUCTIONTheinternalcombustionengineisthemostwidelyusedpowermachineryinmodernsociety ,butisalsooneofthebiggestenvironmentalpol lutantsources.Tomeetmoreandmorestringentemissionrequirements,manyadvancedtech niques,suchastheleanburntechnique ,multi valvet…