受梁端激励斜拉索的非线性振动响应

研究由梁端激励引起的斜拉索非线性振动响应问题.通过对索梁组合结构的边界条件进行了简化,推导了考虑索的初始垂度、几何非线性及受梁端激励的斜拉索非线性振动微分方程,运用多尺度摄动方法,对其可能发生的非线性振动进行了理论研究及数值分析,研究结果表明,在梁的低阶局部振动频率处于一定区域时,梁的小幅振动能够激发斜拉索的大幅度运动,影响大跨度斜拉桥施工过程中索梁组合系统的稳定性和安全性,对于一个给定阻尼和频率比的系统,足够小的激励幅值能够有效避免系统产生共振.     

混流式水轮机座环过渡段的结构分析

通过对混流式水轮机座环过渡段进行分析,获得了过渡段的最优结构。分析结果用C语言编写了程序,应用此程序可以提高设计精度,优化结构,缩短设计周期。     

阻尼对斜拉索大幅振动的影响

针对大跨度斜拉桥拉索大幅振动控制问题,考虑由于索的初始垂度、大位移而引起的几何非线性因素的影响,同时考虑拉索与桥面连接条件和边界条件的影响,建立了拉索在参、强联合激励作用下的面内非线性振动方程.运用多尺度摄动方法,对其进行求解,以长短两根有代表性的拉索为例,研究拉索阻尼的变化对其大幅振动的抑制机理.研究结果表明:增加斜拉索的阻尼,提高了斜拉索发生大幅振动所需激励幅值,在一定程度上增大了桥面振幅的安全区间.     

Hubble Space Telescope Imaging of Neptune's Cloud Structure in 1994

Images of Neptune taken at six wavelengths with the Hubble Space Telescope in October and November 1994 revealed several atmospheric features not present at the time of the Voyager spacecraft encounter in 1989. Furthermore, the largest feature seen in 1989, the Great Dark Spot, was gone. A dark spot of comparable size had appeared in the northern hemisphere, accompanied by discrete bright features at methane-band wavelengths. At visible wavelengths, Neptune's banded structure appeared similar to that seen in 1989.     

崀丰脐橙留树保鲜技术研究初报

为避开赣南脐橙销售高峰期对崀丰脐橙市场的挤压,延长崀丰脐橙鲜果供应期,提高鲜果品质,以崀丰脐橙为试材,采用6种不同浓度赤霉素点喷果实,研究其对崀丰脐橙留树保鲜树体落果量和果实品质的影响。结果表明:30 mg/L赤霉素处理的崀丰脐橙落果量和落果率均最低,落果率仅为14%;其果实可溶性固形物、总糖含量均为最高。6种处理对果实可溶性固形物、总糖含量的影响存在显著差异。通过留树保鲜,不仅提升了崀丰脐橙的品质,且种植效益大幅度提高。     

论精神障碍犯罪人行刑个别化的完善

精神障碍患者犯罪是遗传、疾病以及各种社会因素综合作用下产生的结果,其犯罪行为的发生具有一定的特殊性。因此对其采用一般性的刑罚方法难以达到理想的教育改造效果。依据精神障碍犯罪人的自身特点,在行刑个别化、行刑社会化理念的指导下设计、完善刑事处遇措施以帮助精神障碍犯罪人驱除犯罪原因,重新融入社会生活。根据具体案件的差异将精神障碍犯罪人刑事个别化处遇完善分为社区矫正制度完善与监狱矫正制度完善。     

浅议如何防范公证执业风险

随着《中华人民共和国公证法》的颁布实施,我国公证工作的改革和发展进入了崭新的阶段,公证工作的职能作用也日益显现.但随着公证事业的发展和公证领域的扩大,公证投诉和涉诉案件也日益增多,公证机构和公证员面临的执业风险不容忽视,如何应对执业风险成为一个值得探讨的问题,本文从以下几个方面论述如何防范公证执业风险.     

旅游小城镇规划中的LongStay要素分析

根据小城镇具有发展LongStay的条件,在进行小城镇规划建设中考虑LongStay要素的体现,并对旅游小城镇的效益进行了分析。结果表明：小城镇具有发展LongStay的条件,在城镇的总体规划中体现出其作用,并能对城镇产生经济效益与社会效益。     

论执行程序中抵销的性质、价值及救济

作为债的重要清偿方式，执行抵销具有免除现实给付、简化清偿过程、担保债权公平受偿等重要价值。执行抵销制度的实施对提升执行效率、破解执行难和维护社会公平正义具有重大意义。从设立执行抵销制度趣旨、其运行机制及与实体抵销法理的衔接来看，执行抵销具有非讼性质。根据执行抵销的非讼性质以及充分发挥该制度的价值功用要求，应构建债务人异议之诉来处理执行抵销中的实体争议问题，为被申请执行人合法权益提供充分程序保障。     

执行中止制度的改革与完善

在执行实务中,由于立法上的缺陷和执行中止的随意性太大,过多的适用中止执行导致了大量的执行积案,使执行法院背上了“包袱”;同时,现行的执行中止制度承载了执行当事人过多的误解和不满。本文从执行中止事由的纯化、执行观念的更新和债权凭证制度的构建等方面为建立新的执行中止制度提出了具体的设想。     

农村干部健康水平监控体系的构建与运行

农村干部健康水平监控体系的构建与运行以中国现阶段的体育核心价值观和新农村体育事业的改革与发展要求为理论基础,以当前农村干部的体育活动现状、健康状况、生命质量为实践基础。农村干部健康水平监控体系由5个子系统构成,监控体系的运行方式主要包括确定目标与明确目标责任、建立健康评价指标体系、统计与测量、评价、反馈与调控5项工作。     

Soft X-ray Images of the Solar Corona with a Normal-Incidence Cassegrain Multilayer Telescope

High-resolution images of the sun in the soft x-ray to extreme ultraviolet(EUV) regime have been obtained with normal-incidence Cassegrain multilayer telescopes operated from a sounding rocket in space. The inherent energy-selective property of multilayer-coated optics allowed distinct groups of emission lines to be isolated in the solar corona and the transition region. The Cassegrain telescopes provided images in bands centered at 173 and 256 angstroms. The bandpass centered at 173 angstroms is dominated by emission from the ions Fe IX Fe X. This emission is from coronal plasma in the temperature range 0.8 x 10(6) to 1.4 x 10(6)K. The images have angular resolution of about 1.0 to 1.5 arc seconds, and show no degradation because of x-ray scattering. Many features of coronal structure, including magnetically confined loops of hot plasma, coronal plumes, polar coronal holes, faint structures on the size scale of supergranulation and smaller, and features due to overlying cool prominences are visible in the images. The density structure of polar plumes, which are thought to contribute to the solar wind, has been derived from the observations out to 1.7 solar radii.     

The Drift of Saturn's North Polar Spot Observed by the Hubble Space Telescope

Polar projections of 50 images of Saturn at 889 nanometers and 25 images at 718 nanometers taken by the Hubble Space Telescope in November 1990, as well as 3 images at each wavelength taken in June 1991, have been examined. Among them, 31 show the north polar spot, which is associated with Saturn's polar hexagon, in locations suitable for measurement. In each image, planetocentric coordinates of the polar spot were determined, and the movement of the spot with respect to Saturn's system III rotation rate was studied. During the period of observation, the polar spot had first a short-term westward movement and then a long-term eastward drift. The rate of the long-term drift was -0.060 +/- 0.008 degrees per day with respect to system III, approximately 50 percent greater than previously determined from Voyager. The original 1980 and 1981 Voyager data were combined with the new Hubble images to form an 11-year base line. The eastward drift over the longer period was -0.0569 degrees per day. The long-term drift could be due to uncertainty in the standard value of the internal rotation period, which is 810.7939 +/- 0.148 degrees per 24-hour day. The short-term movement in November 1990 has a rate that is greater in magnitude but opposite in sign and probably represents a real, transient motion of the spot relative to the internal rotation system.     

作物持绿性的遗传、生理基础及其应用前景

随着温室效应的加剧,形成了全球气候变暖的趋势,干旱对作物产量的影响也日趋严重,选育抗旱的品种已成为育种家们努力的目标.持绿性是植物的重要抗旱机制,在多种植物中被发现,引起了作物育种家们的极大兴趣.作物持绿性状的遗传及生理基础研究已经取得很大进展.许多作物持绿性基因数量性状位点(QTL)标记及连锁图构建已经实现.研究表明:在生理基础上持绿性决定于籽粒灌浆期氮素供求关系的平衡,即持绿型品种叶片氮浓度高于非持绿型品种.持绿型品种在干旱条件下,表现出高的蒸腾效率和光合能力,最终获得较高的籽粒产量.大量对持绿基因QTL及其标记的研究和定位,为持绿基因克隆、分子标记辅助育种及转基因育种打下坚实基础,将加快持绿性品种的选育与利用.高粱具有典型的持绿型种质资源,是持绿性研究的样板作物.在高粱上鉴定和分离克隆到的基因也可以直接转化到其他作物中去,为作物改良提供一个很好的变异来源.通过利用高粱的持绿性状来改良高梁、玉米、小麦及其他禾本科作物的抗旱性将是切实可行的.     

试论新疆精准农业实施中的几个问题

对精准农业内容及产生背景进行了概述,通过阐述新疆实施精准农业的意义和分析实施的困难,提出了新疆实施精准农业的方法、步骤及前景.