某大厦基坑支护结构设计与施工

本文结合工程实例与工程地质状况,分析介绍了金色比华利大厦项目深基坑支护结构方案,并在采用的桩-锚支护结构体系设计与验算的基础上,对桩-锚支护施工技术与监测要点进行了详细阐述和总结。     

一种用于时延积分CMOS图像传感器的10 bit全差分双斜坡模数转换器

为了满足时间延时积分(TDI)CMOS图像传感器转换全差分信号的需要,同时符合列并行电路列宽的限制,该文提出并实现了一种10 bit全差分双斜坡模数转换器(ADC)。在列并行单斜坡ADC的基础上,采用2个电容的上极板对差分输入进行采样,电容下极板接2个斜坡输出完成量化。基于电流舵结构的斜坡发生器同时产生上升和下降斜坡,2个斜坡的台阶电压大小相等。该电路使用SMIC 0.18 μm CMOS工艺设计实现,ADC以19.49 kS/s的采样频率对1.32 kHz的输入进行采样,仿真得到无杂散动态范围和有效位数分别为87.92 dB和9.84 bit。测试显示该ADC的微分非线性误差和积分非线性误差分别为–0.7/+0.6 LSB和–2.6/+2.1 LSB。     

一种面向检测的攻击分类方法及在IDS中的应用

对攻击进行分类,可以使攻击检测系统化,有助于构造高效的检测方法,从而改善IDS的性能。该文提出一种以IDS可直接收集的数据为基础、面向检测的攻击分类方法。进而将该方法应用于所有可在IDS网络数据源中检测出的攻击,提出DetectClass分类方法,用Z语言描述并证明其正确性;接着据此构造相应的检测方法。基于DetectClass攻击分类方法,设计开发原型系统DC-NIDS。     

土与结构接触面弹塑性损伤模型用于单桩与地基相互作用分析

基于粗粒土与结构接触面弹塑性损伤静动力统一模型(称作EPDI模型)建立了可用于有限元分析的弹塑性损伤接触面单元。对接触面试验进行了模拟,采用不同的接触面本构模型及参数对单调和循环荷载作用下的单桩基础的侧摩阻力和桩顶位移进行了有限元分析。结果表明:包括剪应力应变关系和剪胀特性在内的接触面力学特性对桩土相互作用分析有重要影响,需要合理地加以描述。基于试验结果建立的弹塑性损伤接触面单元能够有效地用于土体与结构物相互作用分析,并能够合理地反映土与结构接触面的包括体应变及其与剪应变耦合特性在内的接触面主要静动力学特性。     

Neuronal migration disorders: heterotopic neocortical neurons in CA1 provide a bridge between the hippocampus and the neocortex

Neuronal migration disorders have been involved in various pathologies, including epilepsy, but the properties of the neural networks underlying disorders have not been determined. In the present study, patch clamp recordings were made from intrahippocampal heterotopic as well as from neocortical and hippocampal neurons from brain slices of rats with prenatally methylazoxymethanol-induced cortical malformation. We report that heterotopic neurons have morphometrical parameters and cellular properties of neocortical supragranular neurons and are integrated in both neocortical and hippocampal networks. Thus, stimulation of the white matter induces both antidromic and orthodromic response in heterotopic and neocortical neurons. Stimulation of hippocampal afferents evokes a monosynaptic response in the majority of heterotopic neurons and a polysynaptic all-or-none epileptiform burst in the presence of bicuculline to block gamma-aminobutyric acid type A inhibition. Furthermore, hippocampal paroxysmal activity generated by bath application of bicuculline can spread directly to the neocortex via the heterotopia in methylazoxymethanol-treated but not in naive rats. We conclude that heterotopias form a functional bridge between the limbic system and the neocortex, providing a substrate for pathological conditions.     

Treatment problems of eosinophilic granuloma

Two clinical cases of eosinophilic granuloma with pulmonary manifestation were observed. Therapeutical problems were discussed and corticosteroids and cytostatics were recommended.     

成层地基与浅埋结构物动力相互作用的简化分析

基于任意侧向位移下挡土墙地震土压力理论,建立了新的地基-浅埋式结构物相互作用力与其相对位移之间的关系,并对该关系加以推广,应用到成层地基及深基础情形。提出了一种实用的求解成层地基-浅埋式结构物动力相互作用的简化质-阻-弹模型,该方法概念简单合理,参数确定简便,不需迭代,计算量小,可适用于以下情形:1) 结构物可视为粘弹性介质;2) 地基和浅埋式结构物可简化为一维运动;3) 结构物运动对土体运动的影响忽略不计。     

Testosterone and progesterone level alterations in the adult rat after retinoid (retinol or retinoic acid) treatment (imprinting) in neonatal or adolescent age

Newborn rats were treated with a single dose of vitamin A (retinol), or with three doses of retinoic acid (in the 1st, 3rd and 5th days). Serum testosterone and progesterone level was measured in the four months old male and female rats, respectively. Retinol significantly decreased both hormone levels, however retinoic acid decreased the progesterone level only. In the second part of the experiments adolescent rats (in the 6th and 7th week after birth) were treated and measured similar to the newborns. In this case retinol significantly diminished testosterone level, without influencing the progesterone level. Retinoic acid decreased testosterone level and elevated progesterone level. The results demonstrate the long lasting effects of retinoid treatments at a neonatal or adolescent age, pointing also to the differences in the direction of the effects. Considering that previously the receptorial and sexual-behavioral effects of perinatal vitamin A treatments were observed, the experiments call attention to such harmful influences of perinatal vitamin A treatments, which are not manifested in morphological alterations.     

Detection of Carbon Dioxide in Air Using Difference-Frequency Generation Based Infrared Spectrometer

Spectroscopic detection of carbon dioxide (CO₂) in ambient air was performed using a continuous-wave mid-infrared spectrometer based on difference-frequency generation in an AgGaS₂ crystal. Significant improvement in nonlinear optical frequency conversion efficiency was achieved by Gaussian beam optical design consideration. CO₂ concentration was determined from direct-absorption spectral measurement.