检索结果-南通市图书馆

Joint optimization of inspection, maintenance, and spare ordering policy considering defective products loss

Journal of Systems Engineering and Electronics 2021年第5期32卷 1167-1179页

作者： HAN Mengying yang jianhua ZHAO Xiao School of Economics and Management University of Science and Technology BeijingBeijing 100083China Beijing Enter-prise Low-Carbon Operation Strategy Research Base University of Science and Technology BeijingBeijing 100083China School of Business Hebei University of Economics and BusinessShijiazhuang 050061China

This paper proposes a joint inspection-based maintenance and spare ordering optimization policy that considers the problem of integrated inspection,preventive maintenance,spare ordering,and quality control for a four-state single-unit manufacturing *** an inspection detects a minor defect,a second phase inspection is initiated and a regular order is *** quality begins to deteriorate when the system undergoes a severe *** counter this,an advanced replacement of the minor defective system is carried out at the Jth second phase *** a severe defect is recognized prior to the Jth inspection,or if system failure occurs,preventive or corrective replacement is *** timeliness of replacement depends on the availability of *** adopt two modes of ordering:a regular order and an emergency ***,a threshold level is introduced to determine whether an emergency order is preferred even when the regular order is already ordered but has not yet *** optimal joint inspection-based maintenance and spare ordering policy is formulated by minimizing the expected cost per unit time.A simulation algorithm is proposed to obtain the optimal two-phase inspection interval,threshold level and advanced replacement *** from several numerical examples demonstrate that,in terms of the expected cost per unit time,our proposed model is superior to some existing models.

关键词： maintenance two-phase inspection spare ordering three-stage failure process delay-time model

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

A twist in the tale:global insights into archaeal box C/D RNA-guided 2′-O-methylation

引用

Science China(Life Sciences) 2024年第4期67卷 849-850页

作者： Bin Li jianhua yang MOE Key Laboratory of Gene Function and Regulation State Key Laboratory of BiocontrolSchool of Life SciencesSun Yat-sen UniversityGuangzhou 510275China The Fifth Affiliated Hospital Sun Yat-sen UniversityZhuhai 519000China

The 2′-O-methylation of RNA stands as a dynamic and multifaceted modification,wielding significant influence over the regulation of RNA function,stability,and interactions within the cellular context(Sun et al.,2023)... 详细信息

关键词： twist insight

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Compatibility evaluation between waterborne epoxy resin and SBR latex modified asphalt emulsion

引用

Journal of Traffic and Transportation Engineering(English Edition) 2024年第1期11卷 160-171页

作者： jianhua yang Zhengqi Zhang Ying Fang Key Laboratory for Special Area Highway Engineering of Ministry of Education Chang'an UniversityXi'an 710064China

Good compatibility between waterborne epoxy resin(WER)modifier and styrene-butadiene rubber(SBR)latex modified asphalt emulsion(SBRE)is an essential premise for good pavement performance of WER and SBR latex compositely modified asphalt emulsion(WSAE).This study aims to explore the compatibility between WER modifier and *** achieve the goal,several WER modifiers produced by two methods were first selected to modify SBRE,thus the WSAEs were ***,storage stability and workability of the WSAEs themselves,and high-temperature performance,rheological behavior and temperature sensitivity of their evaporated residues were compared and evaluated via performing a series of experiments,respectively,thus the WER modifier possessing an optimal modification effect was *** show that the storage stability of WSAEs is sensitive to the amount of *** incorporation of 1%WERs by the mass of SBRE improves the storage stability of SBRE,while WERs that exceed 1%weaken its storage *** the WERs reach 3%and 4%,the 5 d storage stability of prepared WSAEs will be beyond the limitation of *** WERs into SBRE negatively affects the workability of SBRE,and the workability of WSAEs is adversely influenced by the WERs content and the storage *** ensure the construction,the WSAEs with 3%and 4%WERs should not be stored for more than 36 h and 48 h,*** WERs effectively improve the high-temperature performance of SBRE residue,especially the 3%***,the WERs notably enhance the rheological property and thermal stability of SBRE *** contrast,the WER modifier produced by chemically modified method has a smaller adverse impact on the storage stability and workability of WSAE,and a larger enhancement on the high-temperature performance,rheological property and thermal stability of SBRE residue,which is thus recommended to modify SBRE.

关键词： Waterborne epoxy resin SBR modified asphalt emulsion Workability Rheological property Temperature sensitivity Compatibility evaluation

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Preparation and characterization of high photoactive TiO_2 catalyst using the UV irradiation-induced sol-gel method

引用

Journal of University of Science and Technology Beijing 2006年第4期13卷 350-354页

作者： jianhua Liu Rong yang Songmei Li School of Materials Science and Engineering Beijing University of Aeronautics ＆ Astronautics Beijing 100083 China

High photoactive TiO2 catalyst was prepared using the sol-gel method through UV irradiation during the formation stage of nuclei. The surface morphology and microstructure of the prepared catalyst were characterized using scanning electron microscopy （SEM）, X-ray diffraction patterns （XRD）, and Fourier transform infrared spectroscopy （FF-IR）. The photoactivity was evaluated by the degradation of methylene blue. The results show that the photocatalysis of the prepared catalyst is higher than that of conventional heat-treated particles. The higher photoactivity is a combined result of favorable microstructure, appropriate hydroxyl groups, and active sites of Ti^3＋ ions on the surface of TiO2. It is concluded that the ultraviolet irradiation-induced sol-gel method is an effective method to enhance the photocatalysis of TiO2.

关键词： titanium oxide photocatalysis sol-gel ultraviolet irradiation

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Effective Algorithms to Detect Stepping-Stone Intrusion by Removing Outliers of Packet RTTs

引用

Tsinghua Science and Technology 2022年第2期27卷 432-442页

作者： Lixin Wang jianhua yang Michael Workman Pengjun Wan TSYS School of Computer Science Columbus State UniversityColumbusGA 31907USA the Department of Computer Science Illinois Institute of TechnologyChicagoIL 60616USA

An effective method to detect stepping-stone intrusion(SSI)is to estimate the length of a connection *** type of detection method is referred to as a network-based detection *** network-based SSI detection methods are either ineffective in the context of the Internet because of the presence of outliers in the packet round-trip times(RTTs)or inefficient,as many packets must be captured and *** of the high fluctuation caused by the intermediate routers on the Internet,it is unavoidable that the RTTs of the captured packets contain outlier *** this paper,we first propose an efficient algorithm to eliminate most of the possible RTT outliers of the packets captured in the Internet *** then develop an efficient SSI detection algorithm by mining network traffic using an improved version of k-Means *** proposed detection algorithm for SSI is accurate,effective,and efficient in the context of the ***-designed network experiments are conducted in the Internet environment to verify the effectiveness,correctness,and efficiency of our proposed *** experiments show that the effective rate of our proposed SSI detection algorithm is higher than 85.7%in the context of the Internet.

关键词： network security intrusion detection stepping-stone intrusion round-trip time k-Means clustering connection chain

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

NF-κB and STAT3 signaling pathways collaboratively link infl ammation to cancer

引用

Protein & Cell 2013年第3期4卷 176-185页

作者： Yihui Fan Renfang Mao jianhua yang Texas Children's Cancer Center Department of PediatricsDan L.Duncan Cancer CenterBaylor College of MedicineHoustonTX 77030USA The Methodist Hospital Research Institute and the Departments of Radiology the Methodist HospitalHoustonTX 77030USA

Although links between cancer and inflammation were fi rstly proposed in the nineteenth century,the molecular mechanism has not yet been clearly *** studies have identified chronic infections and infl ammation as major risk factors for various types of ***-κB transcription factors and the signaling pathways are central coordinators in innate and adaptive immune ***3 regulates the expression of a variety of genes in response to cellular stimuli,and thus plays a key role in cell growth and ***,roles of NF-κB and STAT3 in colon,gastric and liver cancers have been extensively *** activation and interaction between STAT3 and NF-κB play vital roles in control of the communication between cancer cells and infl ammatory ***-κB and STAT3 are two major factors controlling the ability of pre-neoplastic and malignant cells to resist apoptosis-based tumor-surveillance and regulating tumor angiogenesis and *** the molecular mechanisms of NF-κB and STAT3 cooperation in cancer will offer opportunities for the design of new chemo-preventive and chemotherapeutic approaches.

关键词： infl ammation tumorigenesis NF-κB STAT3

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

RNA Modifications and Epitranscriptomics

引用

Genomics, Proteomics & Bioinformatics 2023年第4期21卷 675-677页

作者： Chengqi Yi jianhua yang State Key Laboratory of Protein and Plant Gene Research School of Life SciencesPeking UniversityBeijing 100871China Peking-Tsinghua Center for Life Sciences Peking UniversityBeijing 100871China Department of Chemical Biology and Synthetic and Functional Biomolecules Center College of Chemistry and Molecular EngineeringPeking UniversityBeijing 100871China MOE Key Laboratory of Gene Function and Regulation State Key Laboratory of BiocontrolSchool of Life SciencesSun Yat-sen UniversityGuangzhou 510275China The Fifth Affiliated Hospital Sun Yat-sen UniversityZhuhai 519000China

More than 170 distinct chemical modifications have been identified in non-coding and coding *** evidence suggests that RNA modifications play pivotal roles at both the molecular and physiological *** of RNAmodifying enzymes has been linked to various human cancers and developmental *** expanding understanding of RNA modifications in molecular and cellular functions further suggests promising prospects for therapeutic ***,the creation of effective mRNA vaccines against coronavirus disease 2019(COVID-19),based on RNA base modification,was honored with the Nobel Prize in Physiology or Medicine 2023(https://***/prizes/medicine/2023/press-release/).Aiming to provide a forum for emerging advances in detection and functional studies of epitranscriptomic modifications,we have organized a special issue"RNA Modifications and Epitranscriptomics"for the journal Genomics,Proteomics&Bioinformatics(GPB).This special issue encompasses a wide range of topics,including:(1)dynamic landscapes of RNA modifications in various organisms,including animals,plants,and viruses;(2)mechanistic regulation of m^(6)A and m5 C modifications in human diseases and plant responses to stresses;(3)an online platform for unveiling the context-specific m^(6)A methylation and m^(6)Aaffecting mutation;and(4)the regulatory role of non-coding RNAs(ncRNAs),including tRNAs and circular RNAs(circRNAs),in gene expression regulation.

关键词： journal landscape modification

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Preparation and characterization of the TiO_2-V_2O_5 photocatalyst with visible-light activity

引用

Rare Metals 2006年第6期25卷 636-642页

作者： LIU jianhua yang Rong LI Songmei School of Materials Science and Engineering Beihang University Beijing 100083 China

Visible-light responsive TiO2-V2O5 catalyst was prepared using a binary sol-gel and in-situ intercalation method. The TiO2 sol and V2O5 sol were mixed to disperse the V2O5 species in the TiO2 phase at molecular level. The binary sol was then intercalated into interspaces of polyaniline （PANI） by means of in-situ polymerization of aniline. Conglomeration of the TiO2-V2O5 dusters during the calcination process was avoided because of the wrap of polyaniline. The surface mor- phology, the crystal phases, the structure, and the absorption spectra of （PANI）,/TiO2-V2O5 and the composite catalyst were studied using SEM, XRD, FT-IR, and UV-Vis. The photoactivity of the prepared catalyst under UV and visible light irradiation were evaluated by decolorization of methylene blue （MB） solution. The results showed that the composite catalyst displayed a homogeneous anatase phase, and the vanadium pentoxide species was highly dispersed in the TiO2 phase. The composite catalyst responded to visible light because of the narrowed band gap. In this study, the catalyst with the sol volume ratio of TiO2： V2O5 = 10：1 presented the best photocatalytic activity.

关键词： inorganic non-metal materials visible-light active photocatalyst binary sol-gel synthesis composite catalyst

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Ionothermal synthesis of AlPO-34 membranes on macroporous α-Al_(2)O_(3) supports without using organic template

引用

Green Chemical Engineering 2021年第1期2卷 77-85页

作者： Liang Zhou Runlin Han jianhua yang School of Chemical Engineering Dalian University of TechnologyDalian116024China School of Chemistry and Chemical Engineering Jinggangshan UniversityJi’an343009China

Continuous and compact AlPO-34 molecular sieve membranes were successfully synthesized on the outer surface of macroprous tubeα-Al_(2)O_(3)supports under secondary ionothermal growth with the proposed wetting seed *** recyclable ionic liquids(ILs)can both act as solvent media and the structure-directing agent(SDA)of the aiming topological structure of CHA,largely reducing the *** the seed layer could accelerate the diffusion of ILs to the surface of the support and further increase the binding force between the membrane and the *** with the open system,the closed system led to the achievement of the high-quality AlPO-34 *** H_(2)permeance of the resulting membrane was 9.74×10^(-8)mol m^(-2)s^(-1)Pa^(-1)and the ideal selectivities of H_(2)/CO_(2),H_(2)/N_(2),H_(2)/CH_(4),H_(2)/C3H8 and H_(2)/i-C4H10 were 7.48,8.54,14.67,39.25 and 65.83,respectively,which were higher than Knudsen diffusion *** obtained membrane was firstly explored for the PV dehydration of isopropyl alcohol(90 wt%)/water mixtures,exhibiting good performance with the separation factor of 147 and high water flux of 1.09 kg m^(-2)h^(-1).

关键词： Ionothermal synthesis AlPO-34 membrane Gas separation PV Ionic liquid

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Simplified iterative algorithm for OFDM phase noise mitigation

引用

Journal of Systems Engineering and Electronics 2007年第4期18卷 716-720页

作者： yang jianhua Zhao Danfeng Yue Li Zhao Chunhui Coll. of Information and Communication Engineering Harbin Engineering Univ. Harbin 150001 P. R. China

OFDM has been widely adopted in several communication systems. However, OFDM systems are very sensitive to the phase noise, which causes the CPE （common phase error） and ICI （inter-carrier interference）, and thus degrades the system performance significantly. Based on the IEEE 802.11a standard, a simplified iterative phase noise mitigation algorithm is proposed. The proposed algorithm has very low complexity, and requires no additional pilot information. The simulation result shows that good BER performance can be achieved through several few times of iteration.

关键词： phase noise OFDM systems IEEE 802.11a standard inter-carrier interference

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：