mlsa-iai-msu-lab/ru_sci_bench_zho_cite_reranking huggingface dataset:
基于多目标遥感信息处理的城市扩展监测与分析

基于徐州市1994年、2002年和2007年的多时相Landsat TM/ETM+遥感影像,利用建筑用地指数(IBI)提取城市建筑用地信息,通过监督分类获得城市土地覆盖图,由单窗算法反演地表温度. 利用多目标遥感信息处理得到的建筑用地分布、土地覆盖图和地表热环境信息,从土地利用结构变化、城市热环境时空演变两个方面分析了徐州市城市扩展动态,表明徐州市建成区面积不断扩大,城市扩展速度进一步加快,土地利用类型相互转换频繁;城市热岛现象显著,热岛分布与城市建筑用地的轮廓基本吻合,建筑用地不断增加是热岛效应加重的主要因素. 研究表明,综合土地覆盖分类、专题信息提取和地表参数定量反演的多目标遥感信息处理用于监测分析城市扩展与生态环境响应具有明显的优越性
面向对象的LiDAR数据多特征融合分类

针对单源遥感数据分类精度不高的问题,提出一种基于多特征融合的面向对象分类方法. 该方法利用LiDAR点云数据的高程信息,并融合地物粗糙度特征,以及航空影像的地物光谱、形状和上下文信息等多种特征,再基于SVM分类器构建面向对象的分类方法,以提高城区环境下遥感数据分类的可靠性. 试验表明,该方法可有效地提高城区地物的分类精度,且分类结果更符合人的视觉认知规律
论政府在统筹城乡发展中的地位与作用

以我国城乡发展差距产生的原因为线索, 分析了社会主义市场经济条件下政府与市场之间的辨证统一关系. 政府在统筹城乡发展中将处于主导地位, 在统筹城乡规划、城乡公共产品供给、统一城乡居民待遇、统筹城乡财政调控、建设城乡市场等方面发挥着十分重要的作用, 而市场将处于不可替代的辅助地位. 但随着我国市场机制的不断完善, 政府将逐步转变职能, 退出主导地位而处于服务地位
广东新农村建设科技支撑体系现状、问题及对策

结合广东农村区域特色,从现有的农业科技创新与推广服务体系人手,分析其基本现状、存在问题和面临形势,提炼符合广东新农村建设的农业科技支撑体系建设方案,最终构建了广东新农村建设科技支撑体系框架,并提出相应的对策措施
黄淮地区设施园艺作物生产现状与发展对策

从黄淮地区设施栽培作物品种、设施结构类型、设施园艺的发展现状、设施园艺生产存在的问题等方面,全面分析了该地区设施园艺产业的发展状况,提出了该地区发展设施园艺的有关对策,包括推广生态环境友好型栽培模式、发展符合当地实际的现代设施园艺技术体系、加强设施园艺推广队伍建设、创新经营模式等
彩色糯玉米原侨3号春季制种技术

南方春季制种在保证本地糯玉米种源供应上具有重要意义.彩色糯玉米原侨3号在本地春季制种平均每667 m~2产量达107.25 kg;产量构成因素,平均每667 m~2实收穗数为1 803.5条,每穗粒数245.7粒,千粒重248.9 g,穗粒数61.2 g.南方春季糯玉米制种要把握"适当提前播种,发育关键时期避开雨季"原则,抓好产地选择、适期播种、加强田管、做好收贮和防杂保纯等技术
英德茶叶市场竞争力提升分析与对策

英德茶叶历史悠久,英德红茶品牌优势明显,但目前英德茶叶市场占有率不高.分析了英德茶叶背景、发展优势和产业发展过程中存在的问题,提出提升英德茶叶市场竞争力的对策
An 8-b 300MS/s folding and interpolating ADC for embedded applications

A 1.4-V 8-bit 300-MS/s folding and interpolating analog-to-digital converter (ADC) is proposed. Fabricated in the 0.13-μm CMOS process and occupying only 0.6-mm2 active area, the ADC is especially suitable for embedded applications. The system is optimized for a low-power purpose. Pipelining sampling switches help to cut down the extra power needed for complete settling. An averaging resistor array is placed between two folding stages for power-saving considerations. The converter achieves 43.4-dB signal-to-noise and distortion ratio and 53.3-dB spurious-free dynamic range at 1-MHz input and 42.1-dB and 49.5-dB for Nyquist input. Measured results show a power dissipation of 34 mW and a figure of merit of 1.14 pJ/convstep at 250-MHz sampling rate at 1.4-V supply
Stability and vibrational properties of the hydrogen atom for p-type AIN doped with group-II: a first-principles study

The stability and local vibrational mode (LVM) of hydrogen related p-type AIN have been studied by firstprinciples calculations based on density functional theory. The stable and metastable microscopic geometries of group-II (Be, Mg, Ca, Sr, Ba)-H complexes have been investigated. The calculated results indicate that BC_(II) is the most stable configuration for isolated interstitial H~+ and Be-H complexes, while it is AB_(N,⊥) for Mg-H, Ca-H, Sr-H and Ba-H complexes. Moreover, the vibrational frequencies and the values of k and |α|for the H atom with LVM are calculated. Here, the values of k and |α|are used to describe the parameters of the harmonic and anharmonic contributions, respectively. The calculated results indicate that the larger the size of the doped ion is, the shorter the N-H bond length is, and the larger the potential energy, the vibrational frequencies, the values of k and |α|are. This implies that the size of the doped ion has an important influence on the vibrational properties of H
Prospectives of the hadron program in ATLAS

One of the first measurements that will be made at the LHC by ATLAS deals with the properties of inelastic collisions, namely the central charged particle density and transverse momentum distributions. Current predictions of these distributions have large uncertainties in the LHC energy range. We describe the ATLAS minimum bias triggers, designed to select all kind of inelastic interactions, and the performance of the track reconstruction software which was adapted to soft particle track reconstruction. The precision with which the minimum bias distributions can be measured with early data is presented and the uncertainties on the inelastic distributions due to trigger bias is discussed
Exotic pentaquarks as Gamov-Teller resonances

If the number of colors N_c is taken large, baryons and their excitations can be considered in a mean-field approach. We argue that the mean field in baryons breaks spontaneously the spherical and SU(3) flavor symmetries, but retains the SU(2) symmetry of simultaneous rotations in space and isospace. The one-quark and quark-hole excitations in the mean field, together with the SU(3) rotational bands about them determine the spectrum of baryon resonances, which turns out to be in good accordance with reality when one puts N_c =3. A by-product of this scheme is a confirmation of the light pentaquark Θ~+ baryon uudds as a typical Gamov-Teller resonance long known in nuclear physics. An extension of the same large-N_c logic to charmed baryons leads to a prediction of a anti-decapenta (15)-plet of charmed pentaquarks, two of which, β_c~(++) = cuuds and B_c~+= cudds, may be light and stable with respect to strong decays
Quark-clustering in cold quark matter

Quarks are proposed to be grouped together to make quark-clusters due to the strong interaction in cold quark matter at a few nuclear densities, because a weakly coupling treatment of the interaction between quarks there would be inadequate. Cold quark matter is then conjectured to be in solid state (i.e., forming a crystal structure) if the inter-cluster potential is deep enough to localize clusters in lattice. Such a solid state of cold quark matter would be very necessary for us to understand different manifestations of pulsar-like compact stars, and could not be ruled by first principles
以上消化道出血为首发症状的左侧区域性门静脉高压症二例

胃十二指肠溃疡、门静脉高压症、应激性溃疡或急性糜烂性胃炎、胃癌、胆道出血和消化道血管异常是我国上消化道大出血患者的常见病因~[1]. 本文2例患者胃镜检查示孤立性胃底静脉曲张, 彩超检查示门静脉主干不增宽, 无肝硬化征象, 肝功能正常, HBsAg及HCV抗体阴性, 门静脉主干压力正常, 而位于左侧的曲张静脉团压力升高, 故应考虑为左侧区域性门静脉高压症. 左侧区域性门静脉高压症较少见, 约占肝外型门静脉高压症的5%, 但却是惟一可治愈的门静脉高压症~[2]. 根据病因可将左侧区域性门静脉高压症分为胰源性、腹膜后源性和脾源性三类, 其中胰源性所占比例较高~[3]. 本文2例患者分别属于腹膜后源性(副脾所致)与胰源性. 对于此类患者应积极手术治疗, 需行保脾或不保脾的胰体尾切除. 对于恶性肿瘤, 应尽可能地遵循肿瘤根治性切除原则, 以取得最佳远期效果
Using jump-diffusion modeling for valuing real options in infrastructure projects

In infrastructure financed projects, in order to attract private investors, host governments often provide some guarantees. This paper develops a value model of minimum revenue guarantee with multiple-exercise real options under the impact of the emergency incident. The model is applied to infrastructure financed projects using the minimum revenue guarantee under simulation. The simulation results indicate that, before quantifying the value of the minimum revenue guarantee, it is necessary to forecast the jump degree and intensity of the emergency incident, as well as prevent and control risks arising from such emergencies. Otherwise, underestimation of the guarantee value will occur and the government will have to bear huge debt in this condition. We also analyze the dependence of the guaranteed value on the minimum guaranteed revenue level, initial revenue and number of exercise rights. For various conditions, the diagrams of the guaranteed value are also presented
Synthesis and characterization of a thermo-sensitive poly(N-methyl acryloylglycine methyl ester) used as a drug release carrier

In this article, poly(N-methyl acryloylglycine methyl ester) (PNMAME) was prepared as a novel thermosensitive material with a lower critical solution temperature (LCST) at around 49.5℃. The chemical structures of the monomer NMAME and PNMAME were characterized by ~1H NMR and IR measurements. The LCST was investigated systematically as a function of PNMAME concentration, inorganic salt solution and pH value. The results indicated that LCST of PNMAME was obviously dependent on PNMAME concentration and pH. The LCST was increased with a decrease in pH value and PNMAME concentration. To obtain a thermo-sensitive hydrogel with the phase transition temperature close to human body temperature, the copolymerization was conducted between NMAME and N-acryloylglycine ethyl ester (NAGEE). The release behavior of caffeine was evaluated at different temperatures and contents of cross-linkers (N, N-methyle-nebis(acrylamide) (NMBA)). The increase of cross-linker content led to a decrease in the release rate of caffeine due to higher crossing density in the hydrogel network. In addition, a faster release of caffeine from the hydrogel with 3% NMBA at 37℃ was found in contrast to that at 18℃
Natural Hybridization between Rhododendron delavayi and R. cyanocarpum (Ericaceae), from Morphological, Molecular and Reproductive Evidence

The natural hybridization that occurs between two sympatric species of Rhododendron subgenus Hymenanthes in Yunnan, China, was investigated. In field observations, it was noted that the putative hybrids between R. delavayi Franch. and R. cyanocarpum (Franch.) Franch. ex W.W. Sm. had intermediate morphologies. On the basis of morphology, chloroplast DNA (trn L-rp/32) and nuclear DNA (waxy), hybrids and parental species were identified. Hybridization occurred in both directions, but was asymmetrical, with R. delavayi as the major maternal parent. Reciprocal hand pollination treatments showed that either species, as pollen donor or pollen receiver, could produce fruits. It was noted that fruit set varied among treatments. The same pollinators (bumblebees) were shared in both parental species. From these results, we conclude that individuals with intermediate morphologies are indeed of hybrid origin from natural hybridization between R. cyanocarpum and R. delavayi. Furthermore, we presume the hybridization at the study site could have been initiated by habitat disturbance in the 1950s, and we may hence witness the early stages of hybrid swarm formation
基于GIS的海洋专题要素自动化制图模式研究与实现

传统的地图制图为了符合制图规范和读图者视觉要求,往往无法保持完整的地理意义[1]. 以地理数据库为基础的地图制图,能够有效地存储、转换、分析和利用信息传输和反馈的完整性[2],可以满足地理分析的功能,但无法达到相应的制图规范要求. 海洋专题制图作为地图制图学的一个应用,面临着同样的问题,而且由于海洋要素表达的特殊性和复杂性,还存在GIS软件、制图软件、图表绘制软件等多平台、多体系尚无统一制图标准规范的问题. 因此,在GIS强大的空间数据存储功能上,扩展其制图功能,开发针对海洋专题要素自动化制图的功能组件,将海洋要素的表达、存储和分析紧密结合,对于改变传统的海洋图件制作模式和流程具有重要意义
ZiF-Predict: A Web Tool for Predicting DNA-Binding Specificity in C2H2 Zinc Finger Proteins

Engineering zinc finger protein motifs for specific DNA targets in genomes is critical in the field of genome engineering. We have developed a computational method for predicting recognition helices for C2H2 zinc fingers that bind to specific target DNA sites. This prediction is based on artificial neural network using an exhaustive dataset of zinc finger proteins and their target DNA triplets. Users can select the option for two or three zinc fingers to be predicted either in a modular or synergistic fashion for the input DNA sequence. This method would be valuable for researchers interested in designing specific zinc finger transcription factors and zinc finger nucleases for several biological and biomedical applications. The web tool ZiF-Predict is available online at http://web.iitd.ac.in/~sundar/zifpredict/
呼叫中心ACD话务分配优化模型探讨

本文对呼叫中心的概念及话务分配模型所涉及到的技术进行了探讨, 提出了一种优化模型, 将排队的物理层和逻辑层进行了有效的分离, 对呼叫中心服务质量与效率权衡问题的解决提供了较好的理论基础
吸收式热泵精馏过程的机理模型和编程设计

精馏塔是流程工业中能源消耗巨大的分离设备, 热泵精馏就是在这一背景下提出的用于提高精馏塔能源利用率的一种手段. 文章的目的是设计一套吸收式热泵回收精馏塔顶多余的热量, 用来加热塔釜的物料, 达到节省蒸汽消耗的目的. 文中系统地研究了吸收式热泵各换热单元内的热、质传递机理和热动力循环过程, 建立了过程模型, 利用模型进行了优化设计计算. 求出最佳设计参数、操作参数. 数值模拟显示该吸收式热泵的能量利用率高, 温度提升幅度大, 有相当的应用价值和社会效益
基于Smith预估器的大时滞系统控制方法研究与仿真

本文分析了在过程控制中广泛采用的大时滞过程控制算法----Smith预估补偿法, 并重点讲述了其改进算法----双自由度Smith预估器, 最后进行了仿真. 仿真结果表明该改进算法是可行的
基于LabVIEW的鸡蛋破损自动检测系统设计

在食品加工行业, 剔除损壳蛋是一道非常重要的工序. 国内主要依靠检测工人在灯光下观察或转动互碰鸡蛋, 听蛋壳发出的声音等方法来识别、剔除破损鸡蛋. 该方法劳动强度大、效率和精度都很低. 本文针对鸡蛋破损检测中的弊端, 充分利用虚拟仪器软件开发平台 LabVIEW, 实现对破损禽蛋的自动检测和剔除, 降低劳动强度, 提高蛋品的检测精度
发动机控制单元测试系统的设计实现

本文详细介绍了基于Test Stand和LabWindows/CVI软件开发环境, 由工业计算机、商用PXI板卡、负载板卡等构成的一种灵活及高效的发动机控制单元测试系统. 本系统已在发动机控制系统生产线上作为下线测试仪使用, 对发动机控制单元的参数及功能进行检测
人机工程评价研究概况

随着科技和经济的高速发展以及人民生活水平的不断提高,对于安全的需求也不仅仅局限在预防事故和减少职业病的发生,而将提升到舒适、高效的高水平上. 本文概述了人机工程评价方法,简述了国内外人机工程评价的研究现状,并对人机工程评价的发展提出了进一步的展望
辽宁省体彩售票机用户界面优化探讨

本文通过在体育彩票投注站内进行实地观察,总结出彩民的购彩偏好,结合人因工程学理论对辽宁省体彩售票机用户界面的优化进行探讨. 根据GOMS模型,对涉及到大量重复性界面操作的用户界面进行定量分析,来检验界面优化的可行性
预览效应及其认知机制研究述评

自从1997年Watson和Humphreys创立预览搜索范式以来,它成为研究视觉优先选择机制的重要方法,特别是预览效应的认知机制已成为热点. 本文着重论述比较有影响力的视觉标记理论及其实验依据,然后介绍其他解释机制,并对未来的研究作出思考和展望
退变性腰椎滑脱治疗的现状与争议

退变性腰椎滑脱(degenerative lumbar spondylolisthesis, DLS)是指椎弓的完整性没有破坏,由于腰椎的退行性变引起的相邻椎体之间的滑移,导致下腰痛、神经根性疼痛及间歇性跛行等临床表现的疾病.随着内植物研制日新月异并应用于临床,DLS的治疗取得了很大进展,但治疗方法不同,所得疗效和结论也不一致,存在着各种争议,现综述如下
采用双剃工艺提高齿轮箱电机精度

齿轮箱电机广泛应用于家用电器、工业及办公智能设备、电动工具、医疗器械、玩具等电机应用领域. 所以,在齿轮箱电机生产过程中提高齿轮的精度是防止齿轮箱电机在运转中降低噪声、振动的重要措施. 采用以双剃为主的滚剃热珩工艺,较好地修正热处理后齿形变形问题,提高了齿轮的精度
Non-fragile guaranteed cost control of discrete-time fuzzy bilinear system

This paper focuses on the problem of non-fragile guaranteed cost control for a class of T-S discrete-time fuzzy bilinear systems (DFBS). Based on the parallel distributed compensation (PDC) approach, the sufficient conditions are derived such that the closed-loop system is asymptotically stable and the cost function value is no more than a certain upper bound in the presence of the additive controller gain perturbations. The non-fragile guaranteed cost controller can be obtained by solving a set of bilinear matrix inequalities (BMIs). The Van de Vusse model is utilized to demonstrate the validity and effectiveness of the proposed approach
Characteristics of gaseous product from municipal solid waste gasification with hot blast furnace slag

Possibility of combustible gas production from municipal solid waste (MSW) using hot blast furnace (BF) slag has been studied. The objective of this work is to generate combustible gas from MSW using heated BF slag. In this experiment, the thermal stability of the MSW was analyzed by thermogravimetric analysis, and effects of temperature, gasifying agent (air, N_2, steam) and BF slag on the gas products were investigated at 600-900 ℃. The thermogravimetric analysis indicates that the weight loss of MSW includes four stages: evaporation of the moisture, combustion of volatile materials, burning of carbon residue and burnout of ash. The contents of the combustible gas increase with increasing temperature, and the lower calorific value (LCV) increases rapidly at 600-900 ℃. It is found that volume fraction of CO, H_2 and CH_4 at different atmospheres increases in the order N_2
Kinetics of the water-gas shift reaction in Fischer-Tropsch synthesis over a nano-structured iron catalyst

Based on formate and direct oxidation mechanisms, three Langmuir-Hinshelwood-Hougen-Watson (LHHW) kinetic models of the water-gasshift (WGS) reaction over a nano-structured iron catalyst under Fischer-Tropsch synthesis (FTS) reaction conditions were derived and compared with those over the conventional catalyst. The conventional and nanostructured Fe/Cu/La/Si catalysts were prepared by co-precipitation of Fe and Cu nitrates in aqueous media and water-oil micro-emulsion, respectively. The WGS kinetic data were measured by experiments over a wide range of reaction conditions and comparisons were also made for various rate equations. WGS rate expressions based on the formate mechanism with the assumption that the formation of formate is rate determining step were found to be the best
Memory effect on the pressure-temperature condition and induction time of gas hydrate nucleation

The focus of this study is to investigate the influence of memory effect and the relation of its existence with the dissociation temperature, using gas hydrate formation and dissociation experiments. This is beneficial because memory effect is considered as an effective approach to promote the thermodynamic and dynamic conditions of gas hydrate nucleation. Seven experimental systems (twenty tests in total) were performed in a 1 L pressure cell. Three types of hydrate morphology, namely massive, whiskery and jelly crystals were present in the experiments. The pressures and temperatures at the time when visual hydrate crystals appeared were measured. Furthermore, the influence of memory effect was quantified in terms of pressure-temperature-time (p-T-t) relations. The results revealed that memory effect could promote the thermodynamic conditions and shorten the induction time when the dissociation temperature was not higher than 25 ℃. In this study, the nucleation superpressure and induction time decrease gradually with time of tests, when the earlier and the later tests are compared. It is assumed that the residual structure of hydrate dissociation, as the source of the memory effect, provides a site for mass transfer between host and guest molecules. Therefore, a driving force is created between the residual structures and its surrounding bulk phase to promote the hydrate nucleation. However, when the dissociation temperature was higher than 25 ℃, the memory effect vanished. These findings provide for the application of memory effect in hydrate-based technology
A model for estimating flow assurance of hydrate slurry in pipelines

The problem of hydrate blockage of pipelines in offshore production is becoming ev r-increasing severe because oil fields in ever-increasing unusual environments have been brought in production. HCFC-141b and THF were Selected as the substitutes to study the flow assurance of the hydrates in pipelines. There are critical hydrate volume concentrations for these two slurries. Hydrate slurries behave like Bingham fluids and have high agglomerating tendency when the hydrate volume concentrations are larger than the critical ones. Based on rheological behaviors of these two hydrates, a non-dimensional parameter is proposed through studying the driving forces of agglomeration among hydrate particles, which shows the agglomerating probability of hydrate particles in pipeline and can be used to judge the safety of the pipeline. Moreover, a safe model to judge the safely flow hydrate slurries was presented and verified with the experimental data, which demonstrates that the model is effective to judge whether the pipeline can be run safely or not
Composite surfactants aided solvothermal synthesis and catalytic hydrogenation property of oil soluble bimetallic CoMoS nanoparticles

Oil-soluble bimetallic CoMoS nanoparticles were successfully synthesized by a composite-surfactants-aided-solvothermal process. The surface hydrophilicity and functionality of the products were investigated through transmission electron microscopy (TEM), Fourier transform infrared (FTIR) spectra, and Ultraviolet (UV) spectra analysis. The catalytic performance of hydrogenation on the CoMoS nanoparticles was studied with naphthalene as a model compound. It was found that CoMoS catalysts supported on active carbon (AC) was more active than conventional MoS_2/y-Al_2O_3. The activity of CoMoS/AC can be tailored through the change of the Co/(Co+Mo) atomic ratio
Low-temperature CO oxidation over CuO-CeO_2/SiO_2 catalysts: Effect of CeO_2 content and carrier porosity

The effects of CeO_2 contents and silica carrier porosity with their pore diameters ranging from 5.2 nm to 12.5 nm of CuO-CeO_2/SiO_2 catalysts in CO oxidation were investigated. The catalysts were characterized by N2 adsorption/desorption at low temperature, X-ray diffraction (XRD), temperature-programmed reduction by H_2 (H_2-TPR), oxygen temperature programmed desorption (O_2-TPD) and X-ray photoelectron spectroscopy (XPS). The results suggested that, the ceria content and the porosity of SiO_2 carrier possessed great impacts on the structures and catalytic performances of CuO-CeO_2/SiO_2 catalysts. When appropriate content of CeO_2 (Ce content ≤ 8 wt%) was added, the catalytic activity was greatly enhanced. In the catalyst supported on silica carrier with larger pore diameter, higher dispersion of CuO was observed, better agglomeration-resistant capacity was displayed and more lattice oxygen could be found, thus the CuO-CeO_2 supported on Si-I showed higher catalytic activity for low-temperature CO oxidation
高地下水位地区沉管式检查井的研究

采用沉管施工工艺完成检查井井筒的施工,可解决长距离顶管施工和检查井设置距离的矛盾. 介绍了在南方高地下水位地区实施沉井检查井的施工方法,尤其是降水、修补和注浆等施工流程,并介绍了顶管工作井改建成检查井的做法
消防给水及消火栓系统规范的历史回顾与发展

回顾我国消防母规范与子规范中消防给水及消火栓系统的技术发展,提出国家规范<<消防给水及消火栓系统技术规范>>的编制原则,根据概率论和保证率理论论证我国现行消火栓设计流量的合理性,按照使用功能原则确定消防给水稳压泵的设计参数和消火栓的布置原则,以及系统安全可靠性技术措施
盐酸盐金霉素废水处理工程的设计与运行

盐酸盐金霉素废水有机物和氨氮浓度都很高,难以处理. 工程实践表明,采用ABR--3级 A/O--铁碳微电解组合工艺,在进水COD_(Cr)5 120~15 040 mg/L、氨氮650~1 078 mg/L时,出水COD_(Cr)和氨氮分别为80~98 mg/L、1~10 mg/L,达到<<污水综合排放标准>>(GB 8979--1996)一级标准
世博轴工程膜结构屋面排水系统研究

以世博轴及地下综合体工程为背景,对特殊造型的膜结构排水方案进行探讨,用水力学理论分析排水系统的流量、流速、管道阻力等内容,提出设置孔板消除负压的新思路,并以模拟试验方式进行验证
沉井下沉稳定的相关措施

结合天津市某泵站的结构设计,介绍了沉井下沉稳定计算及施工中采取的下沉稳定措施. 施工中刃脚以上部分采用水泥掺量为8%的水泥搅拌桩,便于挖除;刃脚以下部分采用水泥掺量 15%的水泥搅拌桩,防止超沉. 同时,介绍了抗浮稳定验算
雨淋灭火系统优化布置探讨

通过优化雨淋系统中每个雨淋阀控制的喷水面积大小及位置分割,在满足国家相关规范和保障安全的同时减小雨淋系统的设计流量、消防水池容积,从而减少工程造价. 以长条形及品字形舞台设计平面为例,比较了不同喷水区域划分的总设计流量、消防水池容积、设备造价,认为根据不同平面形式采用适当增加雨淋阀并合理分割每个雨淋阀控制区域的系统更具优势
供水管道搭载市政桥梁过河工程实例

介绍了淳安县自来水公司两根DN500的城市供水管道成功搭载"城中湖大桥"过河的工程案例. 分析了供水管道过桥可能对桥梁造成的外观、荷载等方面的影响. 采用球墨铸铁管及T型胶圈接口,计算了温差对管道的影响,并提出应对措施,最后介绍管道排气阀的安装经验. 管道运行一年来安全可靠
生物质能发电厂循环水系统冷却塔的选择

以工程实践为基础,从技术、经济、发电成本和水量损失几个方面,对采用机械通风冷却塔与逆流式自然通风冷却塔的生物质能发电厂循环水冷却系统进行了比较,分析结果表明机械通风冷却塔与自然通风冷却塔相比具有占地面积小、运行灵活、适应能力强等特点,更适合在生物质能发电厂中采用
SMW工法在凌桥支线工程顶管井围护中的应用

SMW工法围护以其施工速度快、成本低、安全性高等特点,越来越多应用于顶管工程的顶管井施工中. 以凌桥支线工程为例,介绍SMW工法围护应用于顶管井的特点以及施工时的工艺流程和质量控制措施及技术措施
成都市乡镇污水处理厂工艺方案探讨与选择

乡镇污水处理厂地理位置分散,经济条件较差,进水水质和水量波动较大,直接套用大型污水处理厂的处理工艺难以满足要求. 介绍了几种适用于小城镇的污水处理工艺,并对其进行适用特点和经济性分析,在此基础上提出成都市乡镇污水处理厂的工艺方案选择建议
城市水系统的发展规律及建立健康水系统的构思

反思现行城市大集中水系统的利弊,提出城市水系统发展的三个阶段,其最终目标是实现水的健康循环. 从加强水源保护和给水深度处理、污水再生利用和零排放着手,形成分区集中式与分块式污水收集处理相结合的健康城市水系统布局模式. 结合实际,重点提出在城市规划、建设及管理中落实水健康循环的对策
城市污水处理厂进水动态特性及其影响研究

城市污水处理厂进水负荷的大幅度变化会对污水处理厂的安全稳定运行造成较大影响,使污水处理工艺很难保持在最佳的运行状态. 针对污水处理厂进水动态变化特性,研究其变化规律、形成原因及其对污水处理厂运行的影响,结果表明,污水处理厂的进水水量存在周期性变化,进水水质变化属正态分布,而且水质指标间显著关联. 在掌握动态特性的基础上,提出了基于动态模拟评价降雨等冲击负荷影响污水处理厂运行的指标和方法
大棚韭菜栽培技术

韭菜为多年生宿根蔬菜, 其短缩茎薄壁组织细胞发达, 具有贮藏营养物质的功能, 一般利用短缩茎(鳞茎)和根系贮藏的营养物质为叶片生长提供营养, 所以常进行保护地囤韭栽培
盐碱胁迫对菊芋种子萌发及幼苗生长的影响

通过盆栽试验对不同程度盐碱胁迫条件下, 菊芋种子萌发及幼苗生长情况进行研究. 结果表明: 在pH> 10.1, 电导率>2.37 mS·cm~(-1)的条件下, 菊芋种子不能出苗, pH<9.5, 电导率<1.27 mS·cm~(-1)时, 菊芋种子能够正常萌发; 在pH<9.3, 电导率<0.65 mS·cm~(-1)的条件下, 菊芋幼苗能够正常生长
全血中锰的石墨炉原子吸收光谱测定方法

目的探讨石墨炉原子吸收光谱法测定血液中锰浓度. 方法采集2 ml早晨班前静脉血, 肝素钠抗凝. 将样品与0.20-/0硝酸按1:9比例进行混匀, 使用日立2-5000原子吸收分光光度计, 运用适当的升温程序, 使用标准加入法定量, 对血锰进行测定. 结果最低检测浓度为0.055μg/L(以 0.1 ml血计, 空白值3倍标准差); 在锰浓度为0~5μg/L范围内, 一次线性回归方程为y=0.03748x+ 0.0239 (r=0.9991,n=3);重现性试验相对标准差为1.82%-3.15%; 回收率试验回收率为97.9%~ 103.3%. 结论该方法操作简便, 灵敏度高, 重现性好, 污染少, 适合于全血中锰浓度的测定
作业场所空气中间苯二甲酸的紫外分光光度测定法

目的建立作业场所空气中间苯二甲酸的紫外分光光度测定法. 方法用氢氧化钾溶液作吸收液, 冲击式吸收管采样, 于紫外分光光度计238 nm波长处直接测量吸光度, 进行定量. 结果方法的检出限为2.0μg/ml, 最低检测浓度为0.04 mg/m~3,(采样体积以45L计). 当标准溶液浓度在0~ 8.0 mg/L时, 相对标准偏差为0.64%~6.13%, 线性范围为0-10 mg/L, 采样效率达到95~98%. 样品在吸收管中可稳定Sd. 结论通过实验室和现场试验证明本法简便、快速、灵敏, 不需要特殊仪器设备, 适宜基层应用
常见有机溶剂主要挥发性化学组分分析

目的揭示有机溶剂挥发性成分中职业危害因素组成, 为有害因素的日常监测与建设项目职业病危害评价提供帮助. 方法使用气相色谱/质谱联用仪(GC/MS)对有机溶剂进行挥发性组分检测, 对2005至2009年5年间898份检测报告进行统计分析. 结果共计检出463种挥发性组分, 累计检出4125次. 检出次数构成中, 主要是烷烃类(55.5%), 其他依次为醇类(13.6%)、含苯化学物 (12.0%)、氯代烃类(6.7%)、酮类(5.3%)、酯类(4.4%), 其他类物质只占2.5%. 其代表性职业危害因素检出率: 甲基戊烷与甲基己烷分别为38.8%和29.3%, 甲醇17.8%、甲苯20.7%、二氯甲烷9.5%、丙酮 8.1%、乙酸乙酯8.1%. 正已烷、三氯乙烯与苯等3种高风险物质主要存在于清洗、去污、稀释剂中, 但某些环保型、水型有机溶剂中也含有较高比例, 其样品检出率分别为24.8%、10.3%、2.9%. 结论职业性危害因素识别过程中, 有机溶剂挥发性组分检测是一个非常重要的方法
A facile synthesis of novel unsymmetrical N-(4-oxo-2-phenyl-3(4H)-quinazolinoyl)-N-(aryl)acetamidines

A series of novel unsymmetrical N-(4-oxo-2-phenyl-3(4H)-quinazolinoyl)-N-(aryl)acetamidines was synthesized by reacting ethyl(lE)-N-(4-oxo-2-phenylquinazolin-3(4H)-yl)ethanimidoate (2) and suitable reactive aromatic amines. Structures' determination of the synthesized compounds was carried out using spectroscopic techniques including IR, 1H NMR, and mass spectrometry. Structural effects on reactivity were also studied
MC simulation of a PGNAA system for on-line cement analysis

A prompt gamma neutron activation analysis system with a ~(252)Cf neutron source for on-line cement analysis has been simulated with the MCNP code. The results indicate that the optimum arrangement is a Bi shield of 20-mm thickness, a polyethylene moderator of 50-mm thickness, a source-to-sample distance of 70 mm, and cement samples of 1200 mmx600 mmx170 mm. To absorb thermal neutrons and suppress low-energy y-rays, the optimum-sized sheets are 150 mmx7 mm Cd, and 150 mmx15 mm Pb