数据库与计算机计算中环境监测数据的正确修约

在使用数据库和计算机计算环境监测数据时,应该按照数值修约规则,编制和使用正确的计算处理程序。     

带毂直齿圆柱齿轮精锻的计算机模拟

此文利用上限法建立带毂直齿圆柱齿轮精锻过程的数学模型,并利用该模型对带毂直齿圆柱齿轮精锻过程中坯料外形尺寸和力一行程曲线进行了计算机模拟。对所得结果作了实验校核。实验结果与模拟结果吻合得较好,证明此文所建立的数学模型和模拟方法是可行的。     

精冲件计算机辅助分析系统的研究与开发

论述了精冲件计算机辅助分析系统的功能和图形识别提取技术及基于FoxPro的数据库技术,介绍了基于事例的人工智能技术在优化排样中的应用。     

环境数据库中的知识发现

介绍了数据库中知识发现的定义及其常用的发现方法，分析了数据库中知识发现的可能性和必要性，对能够发现的知识自理过程，可采用的方法进行了探讨。     

公共场合的计算机病毒防治

本文介绍了有关计算机病毒的一些基本知识，并根据长期的工作实践，提出了在计算机集中使用的公共场合病毒防治办法，以保证计算机的正常运行。     

民航机内非定常燃烧过程的计算机模拟

本文采用数值方法,对民航机内火灾非定常燃烧过程包括其内固体可燃物的受热热解及其挥发份的湍流气相燃烧进行了较为细致的计算,揭示了其火灾非定常燃烧的规律,得到了较好的结果。     

计算机显示器材料的热解动力学分析

利用热重-差热分析仪,在不同的气氛(空气、N2)以及升温速率(10、30、50℃/min)条件下对电脑显示器外壳材料进行了热解特性的研究分析.通过对实验结果的分析,得出了该样品的热解情况及各个阶段的热解动力学参数,同时分析了气氛以及升温速率对材料热解的影响.     

In vitro gossypol induced spermatozoa motility alterations in rabbits

The objectives of the present study were to: (i) examine the in vitro dose response of rabbit spermatozoa motility to the antifertility agent gossypol (GOS) and (ii) determine whether filtered (FIL) and unfiltered (UNFIL) GOS differ in their magnitude of effect. Rabbit semen belonging to adult males (n = 5; 12–14 months) were cultured with UNFIL GOS and FIL GOS (5% solution) and subsequently diluted (1:1–7) for analysis using a Computer Assisted Semen Analyzer (CASA) system in 5 time periods (0, 60, 120, 180 and 360 minutes). At Time 0, no significant change in rabbit spermatozoa motility (MOT) and progressive motility (PROG) with GOS FIL was noted, while increases were observed with GOS UNFIL. At Time 60, weak changes were noted for MOT and PROG. After 120 minutes of culture with both GOS FIL and GOS UNFIL, MOT and PROG decreased significantly in some experimental groups. However, no differences were recorded for both the parameters at Times 180 and 360, with the exception of PROG in the GOS UNFIL category (groups A, B, E, F and G), where a significant decrease was noticed. Detailed evaluation of the distance and velocity parameters revealed reduction in all these studied markers after 60 and 120 minutes of in vitro culture with both GOS FIL and GOS UNFIL, indirectly confirming the PROG decrease. Straightness (STR), linearity (LIN), wobble (WOB), amplitude of lateral head displacement (ALH) and beat cross frequency (BCF) mostly remained unaltered at all time periods for GOS FIL, where as some minor alterations were noticed in GOS UNFIL category for STR, LIN, WOB, ALH and BCF parameters at Time 0, 60 and 120. The present study confirms the dose and time dependent alterations of rabbit spermatozoa motility parameters by GOS. The GOS dynamics in our experiment shows that rabbit spermatozoa as a biological material can indicate a GOS inhibition of motility. Obtained data for the first time indicates a higher immobilizing potential of unfiltered GOS in comparison to filtered GOS in its inhibitory action of spermatozoa motility parameters in rabbits.     

Representative measurement of two-dimensional reactive phosphate distributions and co-distributed iron(II) and sulfide in seagrass sediment porewaters

The high degree of heterogeneity within sediments can make interpreting one-dimensional measurements difficult. The recent development and use of in situ techniques that measure two-dimensional distributions of porewater solutes have facilitated investigation of the role of spatial heterogeneity in sediment biogeochemistry. A colourimetric diffusive equilibration in thin films method has been developed that allows two-dimensional, high-resolution measurement of reactive phosphate in sediment porewaters. A method detection limit of 0.22 μM, an effective upper limit of ∼1000 μM and relative standard deviations typically below 5% were achieved. This method was evaluated by deployment in seagrass (Zostera capricorni) colonised sediments, as part of combined probes with similar colourimetric methods for sulfide and iron(II). The two-dimensional, high resolution distributions obtained provide a highly representative measurement of the co-distributions of porewater solutes, allowing heterogeneous features and biogeochemical processes to be observed and interpreted. Microniches of high phosphate concentration >100 μM were observed throughout the distributions and were interpreted to be due to localised zones of rapid organic matter mineralisation, possibly using electron acceptors other than iron(III) oxyhydroxides (e.g. aerobic respiration) as often they did not correspond with microniches of higher Fe(II) concentration.