基于概率分布的目标未来域解算模型

在分析影响高速机动目标未来域主要因素的基础上,提出了目标未来域解算方法,并基于概率分布建立了目标未来域的数学模型,为空域窗拦阻射击研究提供了一种理论支撑.以某大口径火炮弹道为目标进行了仿真计算,得到了未来域的大小与形状.     

一类考虑内部耗散的非线性竹林发展系统

讨论了一类考虑竹笋影响竹子生长的非线性竹林发展系统,并利用特征线法和积分方程理论,证明了这个系统初边值问题古典解的存在唯一性.     

3种竹笋膳食纤维制备工艺的比较

竹笋纤维具有良好的天然生理活性,利用笋蔸制备活性食用纤维添加剂,变废为宝,成本低,具有良好的应用前景。文中以笋蔸为原料,研究了简便处理、酸碱处理、发酵处理3种竹笋膳食纤维制备工艺,并对产品生理活性、感官品质、得率与纯度进行了比较。结果表明:发酵处理法为最好,该法处理后过120目筛的竹笋膳食纤维,得率为51.23%;纯度为92.62%;持水力为8.40 g/g;溶胀性为7.60 mL/g;同时感官品质也明显提高。     

Auxin/Cytokinin Antagonistic Control of the Shoot/Root Growth Ratio and Its Relevance for Adaptation to Drought and Nutrient Deficiency Stresses

The hormones auxin and cytokinin regulate numerous aspects of plant development and often act as an antagonistic hormone pair. One of the more striking examples of the auxin/cytokinin antagonism involves regulation of the shoot/root growth ratio in which cytokinin promotes shoot and inhibits root growth, whereas auxin does the opposite. Control of the shoot/root growth ratio is essential for the survival of terrestrial plants because it allows growth adaptations to water and mineral nutrient availability in the soil. Because a decrease in shoot growth combined with an increase in root growth leads to survival under drought stress and nutrient limiting conditions, it was not surprising to find that auxin promotes, while cytokinin reduces, drought stress tolerance and nutrient uptake. Recent data show that drought stress and nutrient availability also alter the cytokinin and auxin signaling and biosynthesis pathways and that this stress-induced regulation affects cytokinin and auxin in the opposite manner. These antagonistic effects of cytokinin and auxin suggested that each hormone directly and negatively regulates biosynthesis or signaling of the other. However, a growing body of evidence supports unidirectional regulation, with auxin emerging as the primary regulatory component. This master regulatory role of auxin may not come as a surprise when viewed from an evolutionary perspective.     

PIC单片机在慢射手枪电击发中的应用

慢射手枪电击发装置由红外发射器和硅光电管构成的检测电路,8引脚PIC12F675闪存单片机,输入、驱动、DC/DC转换等电路组成.接收管输出高电平给DC/DC,单片机检测到扣扳机信号,DC/DC输出驱动指令接通电磁阀,电击发一次.控制软件用RISC汇编编写,其指令周期达几微秒,实现了慢射手枪的安全电击发.     

全脑全脊髓放疗中静态调强和容积调强的剂量学对比

回顾性选取2019年在我院放疗中心接受全脑全脊髓照射(CSI)的病人20例,勾画靶区和危及器官(OAR)后,传输至Oncentra 4.1治疗计划系统,对全脑全脊髓放疗采用静态调强(ss-IMRT)和容积调强(VMAT)两种放疗技术进行计划,分别计算两种技术的适形指数(CI)、均匀指数(HI)、107%处方剂量线所包含的靶区体积(V₁₀₇)、靶区内最大剂量点剂量值(D_max)、危及器官受量、正常组织(NT)受量、机器跳数和治疗时间并进行比较,比较两种调强方法的剂量学差异。结果表明,采用VMAT技术,靶区覆盖度、CI、HI、V₁₀₇、D_max、OAR受照量等参数优于ss-IMRT技术,治疗时间和机器跳数也明显减少。但靶区外正常组织(NT)低剂量的辐射区域增大。说明在CSI中,VAMT优于ss-IMRT 具有优势,但接受CSI患者大多是儿童,低剂量的辐射区域是否增加不良反应及其对临床影响有待于进一步研究。     

Growth and dry matter partitioning of Pinot Noir (Vitis vinifera L.) in relation to leaf area and crop load

Treatments varying source:sink ratio (leaf number per vine in relation to crop load) on container-grown Pinot Noir grapevines produced differences in vine growth and dry matter accumulation and partitioning. Vines with (+) and those without (-) fruit were subject to a range of leaf removal treatments. All treatments retained leaves at nodes 1–4 from the shoot base and then had: 100% (control); 66%; 33%; or 0% leaves retained from node 5 to the apex of the shoot. Leaf removal was done as leaves appeared. Leaf removal reduced vine weight. The presence of crop and the number of leaves influenced nodes per shoot and dry weight of the shoots. Removal of leaves did not influence shoot length although un cropped vines were larger in all of the above categories. Removal of either leaves or crop had an impact on leaf number, area per vine, area per leaf and leaf dry weight.'crop' vines carried fewer, and smaller leaves then the 'crop' vines. Carbon partitioning between above ground vegetative organs and roots followed the same relationship, regardless of harvest date, crop status or defoliation treatment. The 'crop 33% leaf retained' vines compensated for leaf removal by increasing their leaf size and dry weight over the '66% leaf retained' and the control.     

大型沉井数字化监测与控制系统的试验研究

结合上海市污水治理二期工程中最大的沉井施工项目ＳＢ泵站沉井工程 ,采用数码相机近景摄影对沉井下沉过程中各方向平移、偏斜及扭转的时间历程进行数字化监测。并运用现代控制理论对沉井的下沉量、下沉速度、井体偏斜量作出预估并结合实测结果对沉井的下沉过程进行动态优化 ,按期望目标进行在线控制 ,并对抗井的终沉进社分析与预报以便达到稳步下沉。     

壳聚糖涂膜保鲜竹笋研究

选用壳聚糖作为涂膜剂处理带壳小竹笋，在4℃低温，相对湿度94%条件下贮藏保鲜25d。贮藏期间对竹笋的失重率、纤维素和VC含量以及氨基酸总量进行了测定。试验结果表明：1.5%壳聚糖混入1.0%对羟基苯甲酸乙酯制成的涂膜剂有较好的保鲜效果，抑制失重和纤维素含量增加有明显效果。用同法处理的带壳乌笋保鲜效果比雷笋好。     

虚拟现实技术及其在坦克射击模拟系统中的应用

虚拟现实(VR)技术利用计算机生成一种模拟环境，通过多传感器设备实现用户与该环境的直接交互，并可构造使人具有感知的虚拟现实系统。VR系统由检测模块、反馈模块、传感器模块、控制模块、3D模块和建模模块构成。基于VR技术的坦克射击模拟系统，由计算机、训练模拟舱、视景系统、考核评分系统、训练模拟数据库组成；计算机进行数据采集和控制，建立、运行和维护仿真数学模型；训练模拟舱提供模拟真实设备的操作机构和指示灯与仪表；视景系统生成模拟系统的工作场景；考核评分系统计算学员成绩并提出评估意见，提供标准试题库且能随机生成试卷。