A vapor collection and thermal desorption method to measure semiochemical release rates from controlled release formulations

Chemicals (bp 270–490 °C/1 atm) evaporated from a controlled-release formulation dispenser were carried by an airflow to a collector packed with a polymeric adsorbent. After a set time, the chemicals were recovered by thermally desorbing them onto a gas-liquid chromatograpic column. They were then separated and quantified. The apparatus is described, and the requirements for its successful use are discussed. The soundness of the thermal desorption technique was confirmed by comparison with another technique: solvent elution from the collector. The advantages of the former technique are discussed.Mention of a commercial or proprietary product in this paper does not constitute an endorsement of that product by the USDA.     

Single machine scheduling with simple linear deterioration to minimize total absolute deviation of completion times

We consider a single machine scheduling problem with simple linear deterioration. Job processing times are assumed to be a simple linear function of a job-dependent growth rate and the job's starting time. We seek an optimal schedule, so as to minimize the total absolute deviation of completion times (TADC). We prove several interesting properties of an optimal schedule, and introduce two efficient heuristics which are tested against a lower bound.     

SMBus协议分析及其在双MCU通讯中的应用

SMBus是一种高效率的同步串行总线。本文在分析其通讯协议的基础上．认为采用SMBus通讯协议作为双MCU间的通讯协议可以达到既节省引脚又减少时钟周期的效果。最后．以C8051F310为例，给出了具体实现方案和程序流程。     

The Full Cost of Cryptanalytic Attacks

An open question about the asymptotic cost of connecting many processors to a large memory using three dimensions for wiring is answered, and this result is used to find the full cost of several cryptanalytic attacks. In many cases this full cost is higher than the accepted complexity of a given algorithm based on the number of processor steps. The full costs of several cryptanalytic attacks are determined, including Shanks method for computing discrete logarithms in cyclic groups of prime order n, which requires n^1/2+o(1) processor steps, but, when all factors are taken into account, has full cost n^2/3+o(1). Other attacks analyzed are factoring with the number field sieve, generic attacks on block ciphers, attacks on double and triple encryption, and finding hash collisions. In many cases parallel collision search gives a significant asymptotic advantage over well-known generic attacks.     

8～18GHz双刀双掷开关研究

采用混合集成电路的方法,用ＰＩＮ管芯制作了８～１８ＧＨｚ双刀双掷开关。开关采用管芯全并联结构。反射式ＤＰＤＴ开关插损≤２．０ｄＢ,隔离度＞５９ｄＢ,开态驻波比≤１．６５,承受功率为连续波５Ｗ。吸收式ＤＰＤＴ开关插损≤２．９ｄＢ,隔离度＞５８ｄＢ,开态与全关断态驻波比≤２．１,承受功率连续波２Ｗ。电路由ＴＴＬ信号控制。     

本地网光缆线路物理双路由的互保问题

针对本地网光缆线路受市政建设的影响，迁、改割接比较频繁且常会受到外力的作用而阻断的情况，讨论了用户引入光缆和中继光缆物理双路由互保的问题。     

光纤传输电视伴音的二次调制技术

本文简述光纤传输电视伴音的二次调制技术的基本原理,并对实现二次调制的实际电路进行了详细分析。     

新型双连杆双曲轴内燃机滑块偏转仿真研究

在分析新型内燃机双连杆双曲轴机构运动特点基础上建立其相应模型,通过仿真找出了各设计参数及其实际尺寸偏差对主要零件滑块偏转角的影响,优化了滑块结构设计,使整个机构工作更加平稳。