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Connection-Free Transmission for Critical MTC

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China Communications 2024年第8期21卷 162-171页

作者： Li Zhigang Yuan Zhifeng ma Yihua Liang Chulong ZTE Corporation Shenzhen 518057China State Key Laboratory of Mobile Network and Mobile Multimedia Technology Shenzhen 518055China

In this paper,a contention-based connection-free transmission scheme is proposed to meet the stringent requirements of ultra-reliability and low-latency for critical machine-type communication(cMTC).To improve reliability,we design multiple independent sparse orthogonal pilots(MISOP)to significantly reduce the probability of pilot collision to the order of 10^(−5).Besides,the advancements of massive MIMO(mMIMO)are exploited to further enhance the *** achieve low latency,connection-free slot-based one-shot transmission without retransmissions is *** the receiver side,single round of multi-user detection(mud)without interference cancellation(IC)can reduce the processing *** imprecise synchronization between cMTC device and the gNB in connection-free transmission,e.g.,time and frequency offsets,are also *** simulation results shows that the proposed scheme can well satisfy the ambitious requirements of cMTC,and has the potential applications in supporting massive cMTC devices in 6G.

关键词： connection-free critical MTC pilot collision sparse orthogonal pilot

Construction of coal pitch-based HA-K grafted poly condensates and their excellent anti-temperature and viscosity-reducing properties

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Petroleum Science 2024年第4期21卷 2806-2816页

作者： Jing Tan Wei Zhang Xiu-Ling Yan Hao Zhou Sher Bahadar Khan Seitkhan Azat Shi-You Yan Hao-Jie ma Xin-Tai Su Xinjiang Key Laboratory of Clean Conversion and High Value Utilization of Biomass Resources College of Chemistry and Chemical Engineering Yili Normal University School of Environment and Energy Guangdong Provincial Key Laboratory of Solid Wastes Pollution Control and Recycling South China University of Technology Drilling Fluid Branch of CNPC Xibu Drilling Engineering Company Limited Department of Chemistry Faculty of Science King Abdulaziz University PO Box 80203 Faculty of Chemistry and Chemical Technology Al-Farabi Kazakh National University Urumchi Huatailong Chemical Additives Co. Ltd.

Humic acids(HAs) are widely used as filtrate and viscosity reducers in drilling fluids. However, their practical utility is limited due to poor stability in salt resistance and high-temperature resistance. Hightemperature coal pitch(CP) is a by-product from coal pyrolysis above 650.C. The substance's molecular structure is characterized by a dense arrangement of aromatic hydrocarbon and alkyl substituents. This unique structure gives it unique chemical properties and excellent drilling performance, surpassing traditional humic acids in drilling operations. Potassium humate is prepared from CP(CP-HA-K) by thermal catalysis. A new type of high-quality humic acid temperature-resistant viscosity-reducer(Graft CP-HA-K polymer) is synthesized with CP-HA-K, hydrolyzed polyacrylonitrile sodium salt(Na-HPAN),urea, formaldehyde, phenol and acrylamide(AAM) as raw materials. The experimental results demonstrate that the most favorable conditions for the catalytic preparation of CP-HA-K are 1 wt% catalyst dosage, 30 wt% KOH dosage, a reaction temperature of 250.C, and a reaction time of 2 h, resulting in a maximum yield of CP-HA-K of 39.58%. The temperature resistance of the Graft CP-HA-K polymer is measured to be 177.39.C, which is 55.39.C higher than that of commercial HA-K. This is due to the abundant presence of amide, hydroxyl, and amine functional groups in the Graft CP-HA-K polymer,which increase the length of the carbon chains, enhance the electrostatic repulsion on the surface of solid particles. After being aged to 120.C for a specified duration, the Graft CP-HA-K polymer demonstrates significantly higher viscosity reduction(42.12%) compared to commercial HA-K(C-HA-K). Furthermore,the Graft CP-HA-K polymer can tolerate a high salt concentration of 8000 mg.L-1, measured after the addition of optimum amount of 3 wt% Graft CP-HA-K polymer. The action mechanism of Graft CP-HA-K polymer on high-temperature drilling fluid is that the Graft CP-HA-K polymer can increase the re

关键词： Viscosity breaker Heat resistance Base mud Graft CP-HA-K polymer CP Salt resistance

Formulating Dead Sea mud in Cosmetic Products, Its Effects on Skin, and the Underlying Biological Mechanism: A Review

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Journal of Cosmetics, Dermatological Sciences and Applications 2024年第3期14卷 276-288页

作者： Ze’evi ma’or Dror Cohen Assaf Assis Dead Sea Hub Fosun Jinmei Cosmetics Dead Sea Israel Laboratory of Biochemistry and Biotechnology of the Skin The Dead Sea & Arava Science Center Masada Israel Ahava Dead Sea Laboratories Ltd. Dead Sea Israel

Research Background: The marketing of cosmetic products derived from Dead Sea (DS) mud has undergone significant evolution, transforming from simple souvenirs into a large-scale cosmetic industry offering a diverse array of products. DS mud is utilized both as pure mud for home spa treatments and as an active ingredient in cosmetic and cosmeceutical formulations. Its global appeal is largely due to its natural, health-oriented image, which aligns with consumer preferences and provides assurance regarding its use in skincare. Research Objectives: This review examines the published data related to the rationale for formulating DS mud in cosmetics, the biological and cosmetic effects of DS mud on the skin, and the speculated bio-mechanisms underlying these effects. Methods: We screened relevant literature on DS mud collected from the shores of the Dead Sea in Jordan and Israel. Publications on mineral muds excavated in different locations around the globe, as well as studies on the biological mechanisms of other DS minerals, were also reviewed as indications and supportive recommendations. Summarizing the vast collected data into a comprehensive review was undertaken to expose readers to the various aspects of DS mud in cosmetics. Results: The primary reason for formulating DS mud in skincare products is its deep cleansing and skin detoxification properties. Consequently, it is often incorporated into rinse-off masks, soaps, and scrubbing products. Additionally, DS mud is used in leave-on products and sheet masks. Cosmeceutical applications of DS mud, recommended for various skin conditions, offer complementary treatments to improve the quality of life for people with skin diseases. The physicochemical and biological effects of DS mud are driven by its rich mineral ion composition, including magnesium, calcium, sodium, potassium, zinc, and strontium—elements known to improve skin barrier function, enhance hydration, and reduce inflammation. The high salt concentration

关键词： Dead Sea Mineral Cosmetics mud Health

Depositional model of the Member Deng-2 marginal microbial mound-bank complex of the Dengying Formation in the southwestern Sichuan Basin, SW China: Implications for the Ediacaran microbial mound construction and hydrocarbon exploration

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Petroleum Science 2024年第2期21卷 806-822页

作者： Jin-Min Song Xin Jin Zhong Luo Shu-Gen Liu shao-Bo Liu Xing-Zhi ma Zhi-Wu Li Xue-Song Lu Ling-Li Zhao Ke-Ran Li Jia-Xin Ren Li-Zhou Tian Hao-Shuang Deng State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Chengdu University of TechnologyChengdu610059SichuanChina PetroChina Research Institute of Petroleum Exploration and Development Beijing100083China Xihua University Chengdu610039SichuanChina

Recent advances in hydrocarbon exploration have been made in the Member Deng-2 marginal microbial mound-bank complex reservoirs of the Dengying Formation in the western Sichuan Basin, SW China,where the depositional process is regarded confusing. The microfacies, construction types, and depositional model of the Member Deng-2 marginal microbial mound-bank complex have been investigated using unmanned aerial vehicle photography, outcrop section investigation, thin section identification,and seismic reflections in the southwestern Sichuan Basin. The microbialite lithologic textures in this region include thrombolite, dendrolite, stromatolite, fenestral stromatolite, spongiostromata stone,oncolite, aggregated grainstone, and botryoidal grapestone. Based on the comprehensive analysis of“depositional fabrics-lithology-microfacies”, an association between a fore mound, mound framework,and back mound subfacies has been proposed based on water depth, current direction, energy level and lithologic assemblages. The microfacies of the mound base, mound core, mound flank, mound cap, and mound flat could be recognized among the mound framework subfacies. Two construction types of marginal microbial mound-bank complex have been determined based on deposition location, mound scale, migration direction, and sedimentary facies association. Type Jinkouhe microbial mound constructions(TJMMCs) develop along the windward margin owing to their proximity to the seaward subfacies fore mound, with a northeastwardly migrated microbial mound on top of the mud mound,exhibiting the characteristics of large-sized mounds and small-sized banks in the surrounding area. Type E'bian microbial mound constructions(TEMMCs) primarily occur on the leeward margin, resulting from the presence of onshore back mound subfacies, with the smaller southwestward migrated microbial mounds existing on a thicker microbial flat. The platform margin microbial mound depositional model can be correlated with certain late

关键词： Sichuan Basin The Member Deng-2 marginal microbial mound-bank complex Depositional model Exploration implications

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改性赤泥负载Pt催化剂催化氧化甲苯的性能

中国环境科学 2024年第3期44卷 1244-1252页

作者：方宏萍梁文俊马琛马连刚李桂贤贵州理工学院资源与环境工程学院贵州贵阳550003 北京工业大学环境与生命学部区域大气复合污染防治北京市重点实验室北京100124

以改性赤泥为载体,采用浸渍方法制备低成本改性赤泥(MRM)负载Pt催化剂,并探究Pt含量对Pt/MRM催化剂催化氧化甲苯活性影响.结果表明0.4Pt/MRM表现出最佳的催化活性,在230℃时甲苯转化率为100%.当空速高达120000h^(-1)时0.4Pt/MRM催化剂... 详细信息

以改性赤泥为载体,采用浸渍方法制备低成本改性赤泥(MRM)负载Pt催化剂,并探究Pt含量对Pt/MRM催化剂催化氧化甲苯活性影响.结果表明0.4Pt/MRM表现出最佳的催化活性,在230℃时甲苯转化率为100%.当空速高达120000h^(-1)时0.4Pt/MRM催化剂依然能保持着较高的催化活性.当甲苯进口浓度为5000mg/m3时仍可以有效氧化甲苯.采用XRD、FT-IR、BET、H2-TPR和O2-TPD等手段进行表征测试分析发现,MRM的比表面积较RM大幅度提高,使MRM能够更好分散活性组分Pt,成为合适的活性组分Pt的催化剂载体.同时所制备的x Pt/MRM催化剂具有较高的比表面积和良好的孔结构.改性赤泥中Fe_(2)O_(3)与活性组分Pt物种相互作用,使催化剂的总氧解吸量增大,提高了催化剂表面氧的迁移率,从而提高了催化效率.

关键词：改性赤泥 Pt 催化燃烧甲苯

自来水厂排泥水处理中板框压滤脱水技术的应用

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全面腐蚀控制 2024年第6期38卷 12-17页

作者：马铁北京市自来水集团有限责任公司通州分公司北京101100

研究自来水厂排泥水处理中板框压滤脱水技术的应用,降低自来水厂的运行成本。以长桥自来水厂作为研究对象,采用板框压滤脱水技术完成自来水厂的排泥水处理,通过隔膜板框压滤机完成脱水;分析隔膜板框压滤机的设计参数,并通过过滤物质的... 详细信息

研究自来水厂排泥水处理中板框压滤脱水技术的应用,降低自来水厂的运行成本。以长桥自来水厂作为研究对象,采用板框压滤脱水技术完成自来水厂的排泥水处理,通过隔膜板框压滤机完成脱水;分析隔膜板框压滤机的设计参数,并通过过滤物质的性质选择压滤机的滤布;最终通过进泥、反吹、脱水、卸泥以及滤布清洗五个部分完成污泥脱水工作。实验表明该方法具有出泥含固率较高、脱水效果好等优势。

关键词：自来水厂排泥水处理板框压滤脱水运行成本滤布卸泥

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基于酚醛反应显色原理的莨纱绸鉴别方法研究

丝绸 2024年第7期61卷 84-90页

作者：马江容郭胜南周子祥周文娟马明波周文龙浙江理工大学纺织科学与工程学院(国际丝绸学院) 杭州310018 温州理工学院浙江温州325035

为了高效地鉴别莨纱绸的真伪,根据芳香醛与薯莨色素发生酚醛缩合反应的机理,将香草醛、4-甲氧基肉桂醛和4-(二甲基氨基)肉桂醛配制成的鉴别试剂分别与薯莨色素溶液混合,观察溶液颜色变化并探究鉴别试剂与薯莨色素溶液的最佳反应条件。... 详细信息

为了高效地鉴别莨纱绸的真伪,根据芳香醛与薯莨色素发生酚醛缩合反应的机理,将香草醛、4-甲氧基肉桂醛和4-(二甲基氨基)肉桂醛配制成的鉴别试剂分别与薯莨色素溶液混合,观察溶液颜色变化并探究鉴别试剂与薯莨色素溶液的最佳反应条件。研究结果表明,3种芳香醛的混合溶液颜色均变深,其中4-(二甲基氨基)肉桂醛组颜色最深即反应最剧烈。最佳反应条件为:质量分数0.2%的4-(二甲基氨基)肉桂醛,pH值1.4,反应温度40℃,反应时间10 min。最后,将芳香醛鉴别试剂滴加到纯正莨纱绸表面,绸面颜色变深、K/S值增加,可用于莨纱绸的高效定性鉴别。

关键词：莨纱绸香草醛 4-甲氧基肉桂醛 4-(二甲基氨基)肉桂醛酚醛缩合反应定性分析

柴达木盆地昆特依盐湖可培养嗜盐细菌多样性研究

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生物技术通报 2024年第7期40卷 285-298页

作者：马想蓉马欣陈胤勋龙启福王嵘邢江娃青海大学医学部基础医学研究中心西宁810016

【目的】探究不同富集时间、培养盐度、稀释梯度、培养基等对氯化物型昆特依高盐盐湖可培养嗜盐细菌多样性的影响,确定嗜盐细菌的最佳分离培养条件,挖掘更多的环境嗜盐细菌资源。【方法】从昆特依盐湖中采集水泥混合样本,选取7种培养基... 详细信息

【目的】探究不同富集时间、培养盐度、稀释梯度、培养基等对氯化物型昆特依高盐盐湖可培养嗜盐细菌多样性的影响,确定嗜盐细菌的最佳分离培养条件,挖掘更多的环境嗜盐细菌资源。【方法】从昆特依盐湖中采集水泥混合样本,选取7种培养基和10%、18% NaCl两个盐度,采用富集培养法、平板稀释涂布法和平板分区划线法分离嗜盐菌;通过16S rRNA基因测序与BLAST序列比对确定菌株系统分类学地位。同时采用免培养Illumina MiSeq高通量测序技术分析昆特依盐湖细菌群落结构多样性特征。【结果】免培养昆特依盐湖样本中共鉴定到细菌39门64纲101目219科703属,其中假单胞菌门(Pseudomonadota)、厚壁菌门(Bacillota)、拟杆菌门(Bacteroidota)和放线菌门(Actinomycetota)为主要的优势菌门。根据菌落的大小、形态、颜色、光泽度、透明度、质地、隆起状态和边缘特征等,共分离出436株嗜盐菌,隶属于3门3纲6目9科28属77种,其中16株可能为潜在新种。3门为厚壁菌门(Bacillota)、假单胞菌门(Pseudomonadota)和放线菌门(Actinomycetota),且均为免培养测序结果中的优势菌门。在属水平上,芽孢杆菌属(Bacillus)、盐单胞菌属(Halomonas)、喜盐芽孢杆菌属(Halobacillus)、枝芽孢菌属(Virgibacillus)和卤水杆菌属(Salicola)为优势菌属。肿块芽孢杆菌属(Tuberibacillus)、越南蔷薇菌属(Rossellomorea)和谷氨酸杆菌属(Glutamicibacter)是首次从盐湖中分离得到。18% NaCl分离得到的菌株数量明显少于10% NaCl,且多样性较低,芽孢乳杆菌科(Sporolactobacillaceae)是该条件下分出的特有菌科。7种培养基中,1/2 RCA培养基分离效果最好。最佳富集培养时间为0、7和60 d,最佳样品稀释梯度为10^(-2)和10^(-3)。【结论】从昆特依盐湖中共分离出嗜盐细菌3门3纲6目9科28属77种。应用多种培养基,设置不同盐度、富集培养时间和稀释梯度等可显著提升可培养嗜盐菌的多样性。

关键词：嗜盐细菌生物多样性氯化物型盐湖分离培养基富集培养梯度稀释高通量测序

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某小型病险水库除险加固工程施工管理要点

河南水利与南水北调 2024年第1期53卷 58-59页

作者：马健镇平县水利局河南镇平474250

小型病险水库除险加固工程建设施工管理要点分析是小型病险水库除险加固工程建设高质量发展的重要保障,对小型病险水库除险加固项目具有十分关键的工程意义。为此,结合镇坪县某小型病险水库除险加固工程建设施工管理要点典型案例展开分... 详细信息

小型病险水库除险加固工程建设施工管理要点分析是小型病险水库除险加固工程建设高质量发展的重要保障,对小型病险水库除险加固项目具有十分关键的工程意义。为此,结合镇坪县某小型病险水库除险加固工程建设施工管理要点典型案例展开分析研究。结果表明,了解工程概况,重点就建设、监理及施工单位等参建主体实施小型病险水库除险加固工程建设施工准备分析研究;同时从土方工程施工、混凝土面板工程、大坝坝顶泥结碎石路面(主要包括路床施工和泥结碎石路面等方面)、下游坝坡排水工程、溢洪道混凝土工程施工(主要包括溢洪道控制段、泄槽段、陡槽段底板浇筑工程和溢洪道消能防冲段等方面)、输水洞闸室、控制室及工作桥混凝土及钢筋混凝土施工、机电及金属结构安装等方面展开水库除险加固工程建设主要工程施工技术管理分析;并完成施工期防汛度汛管理研究。可为类似小型病险水库除险加固工程建设施工管理工程实践提供借鉴参考。

关键词：小型病险水库除险加固工程建设施工管理要点