Convergence History of the Songliao and Jiamusi Blocks in the Eastern End of Central Asian Orogenic Belt: Evidence from Detrital Zircons of Late Paleozoic Sedimentary Rocks

Central Asian Orogenic Belt(CAOB) is one of the largest accretionary orogenic belts in the world. The eastern segment of CAOB is dominated by Paleozoic Paleo Asian Ocean tectonic regime, Mesozoic Paleo-Pacific tectonic regime and Mongolian-Okhotsk tectonic regime. The Songliao and Jiamusi blocks are located in the easternmost part of the CAOB and are the key region to solve the problem about overprinting processes of multiple tectonic regimes. It is generally believed that the Mudanjiang Ocean between the two blocks was finally closed in the Mesozoic, but the Paleozoic magmatism also developed along the Mudanjiang suture zone, while on both sides of the suture zone, there were comparable Paleozoic strata, indicating that the two blocks had converged during the Paleozoic, and the evolution history of the two blocks in the Late Paleozoic remains controversial. The Carboniferous-Permian terrestrial strata mainly developed in Binxian, Wuchang and Tieli on Songliao Block, Baoqing and Mishan on Jiamusi Block. Samples from the Songliao and Jiamusi blocks in the Late Carboniferous-Early Permian and Late Permian are collected for comparative analysis. The LAICP-MS zircon U-Pb dating results show that the maximum depositional age of Middle Permian Tumenling Formation and Late Permian Hongshan Formation in Songliao Block is ~260 Ma, while that of Tatouhe Formation and Carboniferous strata in Jiamusi Block are ~290 Ma and ~300 Ma, respectively, which supports the previous stratigraphic division scheme. The age peaks of ~290-300 Ma, ~400 Ma, ~500 Ma appeared in the Late Carboniferous to Early Permian strata of Jiamusi Block and the Middle Permian strata of Songliao Block. The age peak of ~500 Ma in the Middle Permian strata of Songliao Block may come from the Cambrian basement, Mashan Complex, of Jiamusi Block, while the age peaks of ~420-440 Ma in the Carboniferous strata of Jiamusi Block may come from the Silurian magmatic arc in Zhangguangcai Range in the eastern margin of Songliao Block, reflects the history that they had been potential sources of each other, indicating that they may have combined in the Paleozoic. The Hongshan Formation of Songliao Block in the Late Permian lacks the age peak of ~500 Ma, which indicate that Jiamusi Block was not the provenance of Songliao Block in the Late Permian, that is, there was a palaeogeographic isolation between the two blocks. Combined with the ~210 Ma bimodal volcanic rocks developed along the Mudanjiang suture zone reported previously, we believe that the oceanic basin between the Songliao and Jiamusi blocks should have been connected in Late Permian and reopened during Late Permian to Late Triassic.

Neoproterozoic I-type granites in the Central Tianshan Block (NW China):geochronology,geochemistry,and tectonic implications

The Central Tianshan Block is one of numerous microcontinental blocks within the Central Asian Orogenic Belt(CAOB)that overlies Precambrian basement rocks.Constraining the evolution of these ancient basement rocks is central to understanding the accretionary and collisional tectonics of the CAOB,and their place within the Rodinia supercontinent.However,to date,the timing and tectonic settings in which the basement rocks in the Central Tianshan Block formed are poorly constrained,with only sparse geochemical and geochronological data from granitic rocks within the northern segment of the block.Here,we present a systematic study combining U-Pb geochronology,whole-rock geochemistry,and the Sr-Nd isotopic compositions of newly-identified granitic gneisses from the Bingdaban area of Central Tianshan Block.The analyzed samples yield a weighted mean Neoproterozoic 206Pb/238U ages of 975-911 Ma.These weakly-peraluminous granitic rocks show a common geochemical I-type granite affinity.The granitic gneisses are calc-alkaline and enriched in large ion lithophile elements(LILEs)and light rare earth elements(LREEs),but they are depleted in high field strength elements(HFSEs);these characteristics are similar to those of typical subduction-related magmatism.All samples show initial(^(87)Sr/^(86)Sr)(t)ratios between 0.705136 and 0.706745.Values forεNd(t)in the granitic gneisses are in the range from-5.7 to-1.2,which correspond to Nd model ages of 2.0-1.7 Ga,indicating a role for Mesoproterozoic to Paleoproterozoic rocks in the generation of the granitic protoliths.The documented geochemical features indicate that the protoliths for the gneisses have a similar petrogenesis and magmatic source,which may reflect partial melting of thickened crust with the addition of small amounts of mantle-derived material.The Central Tianshan Block probably constitute part of an exterior orogen that developed along the margin of the Rodinian supercontinent during the Early Neoproterozoic and underwent a transition from subduction to syn-collision compression at 975-911 Ma.

Paleoproterozoic emplacement and Cambrian ultrahigh-temperature metamorphism of a layered magmatic intrusion from the Central Madurai Block,southern India:From Columbia to Gondwana

The Madurai Block in the Southern Granulite Terrane(SGT)of Peninsular India is one of the largest crustal blocks within the Neoproterozoic Gondwana assembly.This block is composed of three sub-blocks:the Neoarchean Northern Madurai block,Paleoproterozoic Central Madurai block and the dominantly Neoproterozoic Southern Madurai Block.The margins of these blocks are well-known for the occurrence of ultrahigh-temperature(UHT)granulite facies rocks mostly represented by Mg-Al metasediments.Here we report a dismembered layered mafic–ultramafic intrusion occurring in association with Mg-Al granulites from the classic locality of Ganguvarpatti in the Central Madurai Block.The major rock types of the layered intrusion include spinel orthopyroxenite,garnet-bearing gabbro,gabbro and gabbroic anorthosite showing rhythmic stratification and cumulate texture.The orthopyroxene-cordierite granulite from the associated Mg-Al layer is composed of spinel,cordierite and orthopyroxene.The pyroxene in both rock units is high-Al orthopyroxene formed under UHT metamorphic conditions.Conventional thermobarometry yields near-peak metamorphic conditions of 9.5–10 kbar pressure and a minimum temperature of 980℃.We computed P–T pseudosections and contoured for the compositional as well as modal isopleths of the major mineral phases,which yield temperature above 1000℃.FMAS petrogenetic grid,Al-in-orthopyroxene isopleth,conventional thermobarometry and calculated pseudosection reveal a clockwise pressure–temperature(P–T)path and near isothermal decompression.The U–Pb data on zircon grains from the layered magmatic suite indicate emplacement of the protolith at ca.2.0 Ga and the metamorphic overgrowths yield weighted ^(206)Pb/^(238)U mean ages ca.520 Ma.Monazite from the garnet-bearing gabbro and Opx-Crd granulite yielded ^(206)Pb/^(238)U weighted mean ages of ca.532 Ma and 523 Ma marking the timing of metamorphism.We correlate the layered intrusion to a Paleoproterozoic suprasubduction zone setting,defining the Ganguvarpatti area as part of a collisional suture assembling the Northern and Central Madurai Blocks.The Paleoproterozoic magmatism and late Neoproterozoic-Cambrian UHT metamorphism can be linked to the tectonics of the Columbia and Gondwana supercontinents.

PALAEOMAGNETIC AND STRUCTURAL INVESTIGATIONS ON BLOCK ROTATIONS AND CRUSTAL SHORTENING IN CENTRAL TIBET

As a part of INDEPTH 3/GEODEPTH geological surface investigations were carried out during two field campaigns in 1998 and 1999. The working area covers a roughly N\|S (30～36°N) tren ding, 200km wide belt through the Lhasa Terrane and Qiangtang Terrane at a longitude of 88～90°E. Field geology was focused on geological mapping, structural measurements, and extensive sampling for the purpose of fission track geochronology. Additionally a total number of 742 orientated palaeomagnetic samples were drilled at 73 sites. Most of the samples were taken in fine\|grained sediments of Cretaceous, Eocene, and Neogene age. Five sites were drilled in acid to intermediate volcanics.A first sequence of measurements has been applied on a set of specimen. Most of the chosen formations (>80%) have acquired stable remanences which are carried by hematite and magnetite. As an example for the characteristic demagnetising behaviour of fine\|grained probable Cretaceous sandstones see Fig.1a. The unblocking temperature of 650℃ allows to identify hematite as remanence carrier.. Although single sites show well\|defined mean directions (e.g. site 76B: α 95 =3 8; k =185 8) the distribution among several site means of one formation could scatter (Fig.1b). It has to be checked carefully if rotations of single crustal elements are responsible for this effect. There is evidence to assume the detected characteristic remanences to be primary—further analysis including fold tests will be performed after the data set has increased.

The Tectonic Implications of the Hongliuhe-Xichangjing Ophiolitic Mélanges Belt in the Central Region of the Beishan Orogen, NW China——Constrained by the U-Pb Ages of Detrital Zircons of the Metasandstones

The tectonic attributes of different blocks within orogenic belts are of great significance for the study of accretionary processes and the evolution of Earth. The Hongliuhe-Niujianzi-Baiyunshan-Xichangjing ophiolitic mélange belt(HXOMB) is distributed in the heart of the Beishan Orogen, the Shuangyingshan and Minshui-Hanshan blocks being distributed in the south and north of the HXOMB respectively, and a large number of Early Paleozoic geological units are exposed on the blocks. According to the zircon age populations of the metasandstones in the Baiyunshan area recovered in this paper, when compared with the zircon age populations of the Paleozoic metasandstones reported in the Niujuanzi and Hanshan areas, we found that the metasandstones of the Shuangyingshan Block have age peaks at c. 598 Ma, 742 Ma, 828 Ma, 941 Ma, 990 Ma, 1168 Ma, 1636 Ma, 2497 Ma with non-significant age populations of 1500–1300 Ma, showing a possible affinity with the Tarim Craton;the metasandstones of the Minshui-Hanshan Block have age peaks at c. 606 Ma, 758 Ma, 914 Ma, 1102 Ma, 1194 Ma, 1304 Ma, 1672 Ma with significant age populations of 1500-1300 Ma, showing a possible affinity with the Chinese Central Tianshan Block. Therefore, the HXOMB of the Beishan Orogen is of great significance in plate segmentation, which separates the Tarim Craton in the south and the Chinese Central Tianshan Block in the north. Based on the evolutionary process of the Hongliuhe-Xichangjing ocean in the Beishan Orogen, we believe that break-up and convergence can be recognized as having occurred twice between the Chinese Central Tianshan Block and the Tarim Craton since the Mesoproterozoic in the Beishan area. This was related firstly to the break-up of the Columbia Supercontinent and the convergence of the Rodinia Supercontinent, mainly during the Middle Mesoproterozoic to Early Neoproterozoic, and secondly to the opening and closing of the Hongliuhe-Xichangjing ocean, mainly during the Early Paleozoic.

新型列控系统列车行车许可CTC显示方案研究

调度集中(CTC)系统中的列车运行状态信息实时显示功能可帮助列车调度人员高效开展行车指挥。新型列控系统下列车采取移动闭塞方式运行,既有CTC系统中的列车行车许可显示无法准确反映列车运行情况,为此需要对列车行车许可在CTC系统中的显示与更新方案进行研究。通过提取列车精准位置信息,分别研究列车位于站内和站间两种情况下行车许可显示范围计算方法,并根据行车许可显示范围计算显示光带的起止点,从而实现列车位置和行车许可范围在CTC终端界面的实时显示及更新。该方案在CTC仿真测试平台及现场试验线路上进行了验证,满足新型列控系统下调度集中系统中列车运行状态信息显示的规范要求,能够准确及时地反映列车运行状态,有利于提升列车调度指挥的准确性和效率。

Permian Tectonic Evolution in the Middle Part of Central Asian Orogenic Belt: Evidence from Newly Identified Volcanic Rocks in the Bilutu Area, Inner Mongolia

In this study, zircon U-Pb ages, geochemical and Lu-Hf isotopic data are presented for the newly identified volcanic rocks which were considered as Bainaimiao group in Bainaimiao Arc Belt(BAB), Inner Mongolia, which could provide important constraints on the evolution of the northern part of North China Block(NCB) and BAB. Basalt to basaltic andesite and andesite to dacite were collected from two sections, which showed eruption ages of 278.2±4.1 Ma and 258.3±3.0 Ma respectively. All samples are characterized by high abundances in Al2O3, LREEs, and LILEs, but depleted in HFSEs. Together with high Mg# ratios and low K/tholeiite to calc-alkaline series, these features indicated that basalt to andesite was likely derived from relatively low degree partial melting of the subduction-fluid related mantle in the spinel phase. And dacite was mainly from the partial melting of crust, then affected by mantle. All samples barely went through fractional crystallization process with the slight Eu anomaly. Compared with the contemporary basalt in NCB, rocks in BAB have a complex composition of zircon and a more positive εHf(t) value(-6.6-6.4), indicating that they had different magma sources of rocks. Though with different basements, NCB and BAB have become an integrated whole before 278 Ma. Therefore, it could be concluded that NCB and BAB belonged to the active continental margin and the PAO had not closed yet until late Permian and then it disappeared gradually and the CAOB developed into a condition of syn-post collision.

Intercontinental response to variations in the Arabia-Eurasia Plate convergence,calcite e-twin evidence of the Kuhbanan Fault system,Central Iran

Variations in the plate convergence direction have generally reflected on the kinematics of the major fault zones developed in the intercontinental parts of the collision zones.The Kuhbanan Fault system is one of the most important intercontinental faults in the Arabia-Eurasia collision zone with a dextral strike slip mechanism.This fault system is composed of three fault strands including Kuhbanan,Bazargan,and Kerman Faults.Here we used calcite e-twin analysis of the vein samples developed in these fault zones to reconstruct deformation condition and the paleodifferential stress direction and magnitude at the Kuhbanan Fault system.Our results represent 190°C-200°C of the deformation temperature and related 5–6±1 km of deformation depth at the Kuhbanan Fault system.Calculated paleodifferential stress magnitude in the Kuhbanan Fault system using e-twin parameters ranges from 169-196 MPa similar to the inner parts of the orogenic systems.Comparing the data set of the Kuhbanan Fault system with previous studies at the Zagros orogen represents an increase of deformation depth and paleodifferential stress magnitudes from the foreland of the Zagros orogen to its hinterland and finally northward around the Kuhbanan Fault system in the central Iranian blocks.We have also proposed a shift of the stress direction from paleo NE to recent N directed by comparing paleostress direction deduced from the calcite e-twin and recent stress direction calculated from GPS and earthquake data analysis around the Kuhbanan Fault system.This kinematics change due to plate reorganization is in agreement with the observed regional variation in convergence direction all in the Arabia-Eurasia collision zone.

活动大陆边缘岩浆作用及构造演化——以敦煌地块为例

大陆边缘弧是汇聚板块边界与俯冲有关的岩浆作用产物,通常记录了造山带弧岩浆作用、造山过程和大陆地壳形成与演化等诸多重要的地质过程。作为中亚造山带中段最南部的构造单元,敦煌地块为传统定义上具有早前寒武纪变质结晶基底的微陆块,其后在古生代时期经历了多期次、多阶段的与中亚造山带造山相关的构造热事件并使其发生再活化,进而产生了一系列广泛的弧岩浆-变质作用事件。然而,对于该陆块古生代弧岩浆作用机制和地壳构造演化历史缺乏系统的研究。本文综合近十多年来对敦煌地块的诸多最新研究进展,系统梳理了古生代岩浆岩岩石组合类型、年代格架、地球化学组成以及同时期变质-沉积构造热事件演化特征,得到以下认识:(1)敦煌地块古生代岩浆作用过程呈现阶段性特征,即幕式岩浆作用,构造位置上从东北部逐渐迁移到南部再折返到中部,大致可划分为五期:~510Ma、440~410Ma、390~360Ma、~330Ma和280~245Ma,而变质作用事件主要集中在450~360Ma;(2)古生代岩浆岩类型主要以钙碱性I型花岗岩、埃达克质岩石、少量S型花岗岩和高钾花岗岩为主,且岩石成分从寒武纪低钾拉斑系列逐渐转变为二叠纪高钾、富硅特征;(3)同位素地球化学特征表明,敦煌地块中-北部寒武纪-泥盆纪发育的与俯冲相关的弧岩浆对新生地壳的生长起了重要贡献,并伴随古老地壳再造事件;而南部泥盆纪-石炭纪岩浆作用则以古老地壳物质重熔为主;(4)基于埃达克质岩石的证据,敦煌地块在古生代时期经历了两次显著的地壳增厚事件,早期可能是与北山南部石板山地体/弧碰撞以及幔源岩浆底侵有关,而晚期可能是与俯冲板片后撤或回卷相关,地壳厚度可达~55km;(5)敦煌地块属于中亚造山带中段最南部一个具有前寒武纪基底的古老微陆块,后期卷入了古亚洲洋南向俯冲相关的造山事件使其被强烈破坏与改造。该微陆块作为古亚洲洋南部的活动大陆边缘弧,被与俯冲作用有关的阶段性弧岩浆底侵、部分熔融、增厚地壳和区域性变质作用等机制改造与活化,产生了阶段性侵位的陆缘弧岩浆作用。这些认识为探究中亚造山带微陆块的起源和造山带的构造演化提供新的约束。

沁水盆地南部郑庄区块中北部煤层气直井增产新技术研究与应用

为提高沁水盆地郑庄区块中北部煤层气直井产量,基于研究区评价井地应力测试资料、压裂裂缝监测资料,分析了研究区直井增产效果差的原因,提出了针对性增产技术,开展了现场对比试验,并对结果进行了分析,结果表明郑庄中北部直井产量低、措施增产效果差的主因为:①研究区以垂直裂缝为主、压裂缝长较短,且随着埋深增加,相同压裂规模形成的裂缝尺寸减小;②随着埋深增加,支撑剂嵌入深度增加,裂缝闭合加快,导致稳产时间短,产气曲线主体形态为“单峰型”;③经初次压裂后煤体结构更加破碎,新裂缝容易进入初次压裂裂缝,造新缝难度增加。针对上述原因,创新提出的充填预堵+大规模压裂+远端支撑增产技术,“充填预堵”即先采用相对较低的排量、砂比、规模充填初次压裂裂缝,然后再进行大规模重复压裂,实现堵老缝、造新缝。“大规模”压裂即大排量、大液量、高砂比压裂,将压裂液量由600~800 m^(3)提高至1300~2000 m^(3)以上,增加改造体积;将排量由6~8 m^(3)/min提高至10~14 m^(3)/min以上,增加裂缝长度和携砂性能;采用低黏压裂液体系配合低密度支撑剂,将砂比由7%~8%提高至10%~15%以上,提高铺砂强度,降低裂缝闭合程度。“远端支撑”即采用自悬浮支撑剂与大排量相结合,增长支撑剂运移距离,提高支撑裂缝比例。充填预堵+大规模压裂+远端支撑增产技术实施后平均单井日产量达到1380 m^(3),比措施前增产1190 m^(3),比邻井稳产气量增加近1000 m^(3),实现了郑庄中北部中深储层连片低产区直井产量突破。现场对比试验表明:实施“充填预堵”后再进行大规模压裂,平均净施工压力比初次压裂增加了3.3 MPa,形成了新裂缝,比直接进行大规模压裂增量提高1000 m^(3)。总体上,充填预堵+大规模压裂+远端支撑增产技术关键参数数值越大,增产效果越好。

区块链在分布式能源交易的应用架构及安全性分析

随着电力工业发展,电能逐渐还原商品属性。电力交易模式由集中式向分布式逐渐演化,引发市场主体互信不足、数据安全性不高、管理难度大等隐患。文章分析了区块链技术在电力交易市场中的应用模式。从定量分析了角度评估电力交易区块链信息安全性。结合区块链技术特征与电力交易通信机制,建立抗毁性与生存度指标,建模定量分析了“弱中心化”电力交易区块链通信网络安全性。算例分析结果表明,“弱中心化”分布式电力交易通信架构相比传统的中心化“星型”通信架构,在可靠度取值范围为0.90~0.99时,前者实际抗毁性比后者提高了2.67%~31.07%,前者实际生存度比后者提高了5.31~5.95倍。

基于拓扑结构分析的断层连通性评价——以川南泸州中区深层页岩气储层多级断层为例

川南深层页岩气是中国天然气增储上产的重要领域。断层连通性是影响深层页岩气储层渗透性能、单井产能的重要因素,前期多针对断层形态、组合样式开展研究,鲜有断层连通性的系统量化评价。研究以川南泸州中区五峰组页岩气储层多级断层为研究对象,利用拓扑结构分析方法研究断层网络拓扑结构,并对其连通性进行定量评价,结果显示:泸州中区五峰组断层发育,断层网络分支的平均连接点数为1.12,可形成高渗通道,有利于页岩气的运移。研究区中部及南部断层产状分散度、断层长度分散度和断层密度均较大,连接型节点、分支数量多,有利于提高断层连通性,其连通性评价结果优于其他区域,具备一定的潜在高产井可能。

基于3等量块和电脑量块比较仪检定4等量块中心长度的可行性分析

为了验证由主标准器3等量块和辅助设备电脑量块比较仪构成的3等量块标准装置检定4等量块中心长度的可行性,分析3等量块标准装置检定原理、数学模型和操作步骤。依据JJG 146—2011《量块检定规程》,检定4等量块中心长度,并评定检定结果测量不确定度。结果表明,长度为50 mm的4等量块中心长度检定结果扩展测量不确定度为0.23μm,小于其测量不确定度要求0.30μm,3等量块标准装置测量结果符合JJG 146—2011中规定,满足量值传递要求,可利用其检定4等量块中心长度。

华北中东部高温地热能成因机制

中国已发现的150℃以上的高温地热资源及其成因机制研究集中分布在地中海-喜马拉雅地热带的西藏南部和云南、四川西部,环太平洋地热带的中国台湾省。近年来,华北中东部高温地热资源探测取得突破:2019年在河北省马头营3965 m深钻获了151℃的高温花岗岩干热岩体,2020年在山西省天镇县1586 m深钻获167℃的高温片麻岩裂隙热储地热流体,2023年在山东省东营市桩西地区4283 m深钻获167.5℃的高温碳酸盐岩岩溶热储;因此,亟需对华北中东部高温地热资源成因机制进行系统研究。本文以上述高温地热田为例,分析华北克拉通破坏、壳幔热物质上涌对地壳浅部高温热异常作用的动力学过程,结合地球物理、地球化学和钻探成果,阐明深部地球动力地质作用对地球浅部高温地温场的塑造和高温热异常制约机制,揭示深部高温热源机制及其上涌通道,形成深部高温热源及其上涌通道和热能聚集构造部位识别技术;阐释典型地段高温地热资源成因机制及其对华北中东部高温地热探测的示范意义。(1)在印欧板块碰撞的远场效应和西太平洋板块俯冲回撤作用下,华北克拉通破坏造成岩石圈减薄、软流圈上涌和热侵蚀、伸展断陷盆地及深大走滑断裂发育等深部地球动力作用,是幔源热物质上涌至地壳浅部的主要驱动力。(2)高导低速体、地球化学证据和高温地热资源分布形成了良好的对应关系,认为幔源热物质向上侵入引起了浅层热异常,为高温地热形成提供了稳定热源;岩石圈构造薄弱带如板块边缘带和切入岩石圈的深大走滑断裂构成了幔源热物质向上侵入的主要通道。(3)凹凸相间的构造格局和地下水流场主导了地壳浅部的热量分布,在浅部岩石热导率差异驱动形成的“热折射”效应下,热流由凹陷区向凸起区聚集,形成古潜山高温热异常。

刮板输送机故障检测系统在马头洗选厂的应用

为降低刮板输送机在运行过程中出现拉斜、断链、跳链等故障的频率及处理响应时长,进而减少因处理刮板输送机故障不及时而导致的生产事故,马头洗选厂安装应用了刮板输送机故障检测系统。该系统通过集成防爆智能AI相机,构建了针对刮板输送机的图像识别模型,并与现有的集控闭锁系统实现整合,从而实现了对常见故障的实时检测、报警、设备停机等功能。实践表明,3113#矸石刮板输送机在安装应用该系统后,故障发生频率及事故影响生产的时长均有显著下降;根据改造后2024年3月的统计数据,与改造前2023年12月的数据相比,因刮板输送机故障导致的事故处理时长缩短了2.5 h,设备空转电费减少约12000元,材料更换成本降低约14400元。刮板输送机故障检测系统的成功应用,有效降低了管理成本、生产成本及故障相关风险,并为后续其他设备的故障检测改造提供了宝贵的有益参考。

天津市法租界中心花园历史文化街区复兴

中心花园历史文化街区位于天津市原法租界的中心地带,是最能代表天津法租界景观特色的精华之地,是近代天津社会、经济、文化发展的一个缩影,也是天津近代发展的重要物质载体。城市发展应具备长远眼光,完善街区的综合功能,更好地保护中心花园历史文化街区的历史文化风貌,使街区在发展过程中充分发挥自身人文和物质资源优势。本文深入分析天津中心花园历史文化街区的价值与发展历程,对历史街区的活化利用进行探索与总结。

历史街区夜景照明设计与文化融合的实践报告——以温州五马历史文化街区为例

本文是还原建筑肌理、色彩、氛围等营造手法在历史街区夜景照明设计中的思考。文章总结温州五马历史街区夜景照明的现状问题及设计与文化融合,以中轴线照明规划原则,体现城市功能定位,创造有活力的夜景照明环境,统筹日间和夜间的视觉感受。

基于信号集中监测系统的轨道电路码序监督方法研究

自动闭塞线路通过轨道电路向列车传递低频码来反映前方空闲闭塞分区的数量,为列车运行提供行车指令,一旦轨道电路低频码错误将产生严重的安全风险。为此研究一种通过既有信号集中监测系统(CSM)实现轨道电路低频码序监督的方法。结合CSM系统的自采集数据、ZPW-2000接口数据、列控中心接口数据、联锁接口数据等,实现相邻区段(闭塞分区)低频码码序一致性分析、区段(闭塞分区)低频码与区段占用逻辑一致性分析,以及区段低频码与前方信号机显示逻辑一致性分析等。当出现不一致时,可以及时报警提醒。同时,针对一些特殊场景进行分析并提出对应规避措施。基于“仿真测试+现场跟踪”相结合的测试验证表明,该方法准确可靠,可避免误报和漏报的发生。

汽车中控饰板刀口抽芯双色注射模设计

针对一款车型的中控饰板壳体,设计了一副活动刀口抽芯在同一个模腔内实现切换双色的一种新型双色注射模,该类型的双色模具采用双色注塑腔内切换机构,第一射与第二射相交之间设计一个抽芯滑块作为一个刀口开关阀门,用于控制以下所述第一注射位置与第二注射位置之间切换,从而相比与传统的旋转式双色模具质量更稳定,生产成本更低,产品品质合格率更高。通过实际验证,结果表明,该种滑块刀口抽芯式双色模具运行稳定可靠,满足生产要求,实现提高了生产效率并降低了成本。