基于SG需求的康养景观设计研究

随着人口老龄化趋势的加剧,康养景观作为一种恢复和改善使用者生理、心理健康的景观环境,备受老年群体关注,但目前针对老年人SG(Slow Go)群体的研究仍然不足。研究介绍了康养景观的定义和特征,以及老年人类型及特征;针对老年人SG群体的特征和需求,探讨了他们在心理和生理上的特点,以及对康养景观的需求;进一步阐述了康养景观与老年人SG群体需求的相关性,包括提供与自然互动的机会、社交机会和体验成就感的机会等;根据老年人SG群体的需求,提出了康养景观设计的要点,包括场地设计、设施设计和活动设计等方面的建议。综合来看,研究深入探讨了老年人SG群体与康养景观之间的关系,为未来相关研究和实践提供了一定的参考。

Outage Probability Analysis for D2D-Enabled Heterogeneous Cellular Networks with Exclusion Zone:A Stochastic Geometry Approach

Interference management is one of the most important issues in the device-to-device(D2D)-enabled heterogeneous cellular networks(HetCNets)due to the coexistence of massive cellular and D2D devices in which D2D devices reuse the cellular spectrum.To alleviate the interference,an efficient interference management way is to set exclusion zones around the cellular receivers.In this paper,we adopt a stochastic geometry approach to analyze the outage probabilities of cellular and D2D users in the D2D-enabled HetCNets.The main difficulties contain three aspects:1)how to model the location randomness of base stations,cellular and D2D users in practical networks;2)how to capture the randomness and interrelation of cellular and D2D transmissions due to the existence of random exclusion zones;3)how to characterize the different types of interference and their impacts on the outage probabilities of cellular and D2D users.We then run extensive Monte-Carlo simulations which manifest that our theoretical model is very accurate.

Investigation of pore geometry influence on fluid flow in heterogeneous porous media:A pore-scale study

Brazilian pre-salt reservoirs are renowned for their intricate pore networks and vuggy nature,posing significant challenges in modeling and simulating fluid flow within these carbonate reservoirs.Despite possessing excellent petrophysical properties,such as high porosity and permeability,these reservoirs typically exhibit a notably low recovery factor,sometimes falling below 10%.Previous research has indicated that various enhanced oil recovery(EOR)methods,such as water alternating gas(WAG),can substantially augment the recovery factor in pre-salt reservoirs,resulting in improvements of up to 20%.Nevertheless,the fluid flow mechanism within Brazilian carbonate reservoirs,characterized by complex pore geometry,remains unclear.Our study examines the behavior of fluid flow in a similar heterogeneous porous material,utilizing a plug sample obtained from a vugular segment of a Brazilian stromatolite outcrop,known to share analogies with certain pre-salt reservoirs.We conducted single-phase and multi-phase core flooding experiments,complemented by medical-CT scanning,to generate flow streamlines and evaluate the efficiency of water flooding.Subsequently,micro-CT scanning of the core sample was performed,and two cross-sections from horizontal and vertical plates were constructed.These cross-sections were then employed as geometries in a numerical simulator,enabling us to investigate the impact of pore geometry on fluid flow.Analysis of the pore-scale modeling and experimental data unveiled that the presence of dead-end pores and vugs results in a significant portion of the fluid remaining stagnant within these regions.Consequently,the injected fluid exhibits channeling-like behavior,leading to rapid breakthrough and low areal swept efficiency.Additionally,the numerical simulation results demonstrated that,irrespective of the size of the dead-end regions,the pressure variation within the dead-end vugs and pores is negligible.Despite the stromatolite's favorable petrophysical properties,including relatively high porosity and permeability,as well as the presence of interconnected large vugs,the recovery factor during water flooding remained low due to early breakthrough.These findings align with field data obtained from pre-salt reservoirs,providing an explanation for the observed low recovery factor during water flooding in such reservoirs.

CEEMD-SG滤波在固井质量测井资料处理中的应用

目前固井质量评价主要依靠声波变密度测井资料,受双层套管影响,变密度图像有时会因内、外层套管波叠加出现明显的畸变现象,对固井质量的评价产生干扰。为获得真实的变密度图像,剔除“假异常”,将互补集合经验模态分解(CEEMD)和Savitzky-Golay(SG)滤波法联合,提出一种CEEMD-SG滤波方法,并应用于声波变密度测井数据处理。首先使用CEEMD方法对变密度数据进行分解,通过傅里叶变换对原始信号及分解得到的各个固有模态函数(IMF)进行频谱分析,然后选取高频IMF分量使用SG滤波算法进行处理,并将滤波后的高频分量与CEEMD分解得到的低频分量联合重构得到处理后的信号。利用该方法对塔里木油田实际变密度资料进行处理,并与CEEMD、小波阈值去噪、SG滤波三种方法进行对比,结果表明,CEEMD-SG滤波方法能更好地消除双层套管带来的波形叠加干扰,处理后的资料能满足现场验收要求。

平沙绿僵菌SG-A两种培养基比较及其对瓜绢螟的致病活力

为比较平沙绿僵菌SG-A在两种培养基上的生物学特性及对瓜绢螟不同虫态的致病力,室内测定了平沙绿僵菌SG-A在马铃薯葡萄糖琼脂培养基(PDA)和萨氏培养基(SDAY)上培养14 d后的菌落大小、产孢量及孢子萌发率等指标,并采用浸虫法测定了对瓜绢螟不同虫态的致病力。结果表明,平沙绿僵菌SG-A在PDA培养基中培养14 d后的产孢量显著高于SDAY培养基,菌落大小和孢子萌发率差异不显著。平沙绿僵菌SG-A对瓜绢螟2龄、4龄幼虫和蛹均存在较高的致病力,孢子浓度越大,致病力越高,其中对蛹的致病力最高,LC_(50)为1.93×10^(5)个·mL^(-1),当孢子浓度为1×10^(8)个·mL^(-1)时,处理8 d蛹的累积死亡率为90%,2龄和4龄幼虫的累积死亡率也分别达到86.67%和83.33%,但4龄幼虫出现死亡的时间要早于蛹和2龄若虫,LT_(50)为2.60 d。综上所述,平沙绿僵菌SG-A对瓜绢螟各虫态均具有较高的致病力,可进一步挖掘其生防潜力。

基于SGS模型的茶盘造型设计研究

为进一步拓展产品设计路径,基于管理学中的SGS(门径管理系统,Stage-Gate-System的简称)模型开发产品设计流程,面向用户需求展开SGS模型在产品设计中的应用。以茶盘造型的概念设计为例,结合SGS模型的产品开发方法,优化设计程序,从而解决茶具设计的适用性、美观性及安全性等问题,最终,通过导入SGS模型,提高了茶具设计的用户评价度,为同类产品的造型设计提供参考。

基于SG-I6000 2.0+CMBD的电力智能运维系统设计与实现

为促使电网公司运维工作规范化、便捷化,提高电网运维效率,在原有SG-I6000 2.0系统架构基础上,融入配置管理数据库(CMBD),构建基于SG-I6000 2.0+CMBD的电力智能运维系统。该系统自上而下分为应用层、中台服务层和运维感知层,相比原系统新增了资源配置、流程服务、健康履历、自动审计、业务流微应用、构建自主流程微应用、资源全过程管理等。并发测试结果表明,新系统最大可承受1000个并发用户同时使用的需求。压力测试结果表明,在最大500个用户数量同时操作情况下,平均事务响应时间仅为40.8 s,相比原系统降低了63%,运维效率得到显著提升。

ESG表现对企业价值的影响——基于国内上市企业的经验证据

随着“双碳”战略的提出和可持续发展理念不断深入人心,高质量发展已成为我国新的发展目标。在企业层面,ESG表现不仅是企业责任的体现,更成为了衡量企业长期价值和可持续发展潜力的重要指标。基于此背景,以2010-2022年沪深A股上市企业为样本,实证研究ESG表现对企业价值的影响,以及技术创新水平在其中的中介作用,并进一步分析产权性质、会计信息披露质量在ESG表现对企业价值的影响机制中所具有的调节作用。研究结果表明:良好的ESG表现可以显著提升企业价值,且技术创新在二者之间存在部分中介效应;良好的ESG表现对企业价值的提升作用在非国有企业和会计信息披露质量合格的企业中更加显著。因此,政府可以通过相应的政策奖励激励企业提升ESG表现,以增强ESG表现的价值效应;企业应加强技术创新,走可持续发展之路,通过引进先进环保技术,整合绿色供应链,响应国家“双碳”目标,提升ESG表现;投资者应基于长期视角,优化ESG评估框架,优先投资ESG表现良好和技术创新突出的企业,助力实现资本市场良性循环。

新型纳米碳材SG6在耐热输送带覆盖胶中的应用研究

本课题研究了新型纳米碳材SG6在耐热输送带覆盖胶中的应用,通过对配方中的N660炭黑进行逐量替代,考察了SG6对胶料的硫化特性、物理机械性能、耐磨性能、动态力学性能、导热性能和导电性能的影响。结果表明,SG6从0份逐渐替代到24份,混炼胶的扭矩差值略微减小,t_(10)及t_(90)基本保持不变,门尼黏度略有降低;硫化胶硬度降低,拉伸强度,拉断伸长率以及定伸应力有所改善;同时可使耐热输送带覆盖胶动态生热有所降低,导热系数增大,表面电阻值明显降低,有效改善输送带覆盖胶产品的质量。

塔式光热机组 SGS 跳闸控制逻辑调试方法优化改进

为了减少换热器在蒸汽发生系统(SGS)在启动/停止的过程中产生的热应力,防止SGS跳闸后公用熔盐管路发生串盐现象,提高调试质量,通过增加SGS换热器熔盐侧温度变化率高触发SGS跳闸保护,SGS中任意一列SGS跳闸且触发疏盐条件,另一列同时触发疏盐条件。优化SGS疏盐自动控制逻辑、调试方法,可确保塔式光热机组SGS跳闸后设备动作顺序正确可靠,减少SGS跳闸后系统恢复时间,降低SGS熔盐冻结的风险。

A Generalized Array Factor for Time-Modulated Hexagonal Based Antenna Array Geometry With Novel Trapezoidal Switching

The concept of the time-modulated array has been emerging as an alternative to the complex phase shifters,which lowers the cost of the array feeding network due to the utilization of radio frequency(RF)switches.The various forms of hexagonal antenna array geometries can be used for applications like surveillance tracking in phased array radar and wireless communication systems.This work proposes the generalized array factor(AF)for the hexagonal antenna array geometry based on time modulation.The time modulation in generalized hexagonal geometry can maintain the fixed static amplitude excitation,giving more flexibility over time.Furthermore,a novel trapezoidal switching function is also proposed and applied to the generalized array factor to enable future researchers to use this array factor in the field of advancement to observe how switching schemes like trapezoidal and rectangular affect the array pattern's side lobe level(SLL).The generalized equation can be utilized for the analysis and synthesis of radiation characteristics of the time-modulated hexagonal array(TMHA),time-modulated concentric hexagonal array(TMCHA),time-modulated hexagonal cylindrical array(TMHCA),and time-modulated hexagonal concentric cylindrical array(TMHCCA).The numerical result illustrates the generation of AF of time-modulated hexagonal structures and also shows that the trapezoidal switching sequence outperforms the rectangular switch using the cat swarm optimization(CSO)approach.

A photogrammetric approach for quantifying the evolution of rock joint void geometry under varying contact states

Accurate measurement of the evolution of rock joint void geometry is essential for comprehending the distribution characteristics of asperities responsible for shear and seepage behaviors.However,existing techniques often require specialized equipment and skilled operators,posing practical challenges.In this study,a cost-effective photogrammetric approach is proposed.Particularly,local coordinate systems are established to facilitate the alignment and precise quantification of the relative position between two halves of a rock joint.Push/pull tests are conducted on rock joints with varying roughness levels to induce different contact states.A high-precision laser scanner serves as a benchmark for evaluating the photogrammetry method.Despite certain deviations exist,the measured evolution of void geometry is generally consistent with the qualitative findings of previous studies.The photogrammetric measurements yield comparable accuracy to laser scanning,with maximum errors of 13.2%for aperture and 14.4%for void volume.Most joint matching coefficient(JMC)measurement errors are below 20%.Larger measurement errors occur primarily in highly mismatched rock joints with JMC values below 0.2,but even in cases where measurement errors exceed 80%,the maximum JMC error is only 0.0434.Thus,the proposed photogrammetric approach holds promise for widespread application in void geometry measurements in rock joints.

CLASSIFICATIONS OF DUPIN HYPERSURFACES IN LIE SPHERE GEOMETRY

This is a survey of local and global classification results concerning Dupin hypersurfaces in S^(n)(or R^(n))that have been obtained in the context of Lie sphere geometry.The emphasis is on results that relate Dupin hypersurfaces to isoparametric hypersurfaces in spheres.Along with these classification results,many important concepts from Lie sphere geometry,such as curvature spheres,Lie curvatures,and Legendre lifts of submanifolds of S^(n)(or R^(n)),are described in detail.The paper also contains several important constructions of Dupin hypersurfaces with certain special properties.

Optimal AP Deployment in Cell-Free Massive MIMO Systems with LoS/NLoS Transmissions:A Stochastic Geometry Approach

Cell-free massive multiple-input multipleoutput(MIMO)is a promising technology for future wireless communications,where a large number of distributed access points(APs)simultaneously serve all users over the same time-frequency resources.Since users and APs may locate close to each other,the line-of-sight(Lo S)transmission occurs more frequently in cell-free massive MIMO systems.Hence,in this paper,we investigate the cell-free massive MIMO system with Lo S and non-line-of-sight(NLo S)transmissions,where APs and users are both distributed according to Poisson point process.Using tools from stochastic geometry,we derive a tight lower bound for the user downlink achievable rate and we further obtain the energy efficiency(EE)by considering the power consumption on downlink payload transmissions and circuitry dissipation.Based on the analysis,the optimal AP density and AP antenna number that maximize the EE are obtained.It is found that compared with the previous work that only considers NLo S transmissions,the actual optimal AP density should be much smaller,and the maximized EE is actually much higher.

水稻散生突变体sg518的鉴定及基因定位

[目的]分蘖角作为水稻株型的重要组成部分,其遗传基础复杂,需鉴定更多与分蘖角相关的突变体和基因以进一步解析水稻分蘖角的分子调控机制。[方法]通过对贵州地方粳稻品种桥港珍珠米进行60Co辐射诱变后成功获得一份水稻散生突变体,暂命名为sg518(spreading-grown mutant 518),并对其进行表型鉴定、遗传分析、基因定位和候选基因测序验证。[结果](1)田间性状显示,与野生型相比,突变体sg518表现出分蘖角显著增大的散生表型,并伴有一次枝梗数增加、每穗实粒数增加、籽粒变小和千粒重降低;(2)遗传分析表明,该突变体的散生性状受一对隐性核基因控制;(3)精细定位结果显示,目标基因定位于11号染色体长臂RM287与J1标记之间的88.7 kb内;(4)MutMap分析表明,在此区间有1个SNP频率为1的InDel突变且位于LAZY1基因上;(5)对目标基因的PCR扩增与测序结果表明,突变体的LAZY1基因在第3外显子上有1处1 bp的碱基缺失,导致蛋白翻译提前终止,由此推断LAZY1基因为突变体sg518的候选基因。[结论]sg518为LAZY1基因的一个新等位突变体,可进一步为研究该基因功能及水稻分蘖角的调控机制提供理论基础。

基于巨型住肉孢子虫SPFH-SG蛋白ELISA方法的建立

本试验以藏绵羊食道肌巨型住肉孢子虫(Sarcocystis gigantea)SPFH-SG蛋白为研究对象,通过基因克隆及蛋白表达,建立了一种特异性、重复性均良好的间接ELISA检测方法,为藏羊住肉孢子虫病的批量临床检测提供技术方案。

Modeling and Performance Analysis of UAV-Aided Millimeter Wave Cellular Networks with Stochastic Geometry

UAV-aided cellular networks,millimeter wave(mm-wave) communications and multi-antenna techniques are viewed as promising components of the solution for beyond-5G(B5G) and even 6G communications.By leveraging the power of stochastic geometry,this paper aims at providing an effective framework for modeling and analyzing a UAV-aided heterogeneous cellular network,where the terrestrial base stations(TBSs) and the UAV base stations(UBSs) coexist,and the UBSs are provided with mm-wave and multi-antenna techniques.By modeling the TBSs as a PPP and the UBSs as a Matern hard-core point process of type Ⅱ(MPH-Ⅱ),approximated but accurate analytical results for the average rate of the typical user of both tiers are derived through an approximation method based on the mean interference-to-signal ratio(MISR) gain.The influence of some relevant parameters is discussed in detail,and some insights into the network deployment and optimization are revealed.Numerical results show that some trade-offs are worthy of being considered,such as the antenna array size,the altitude of the UAVs and the power control factor of the UBSs.

Estimation of surface geometry on combustion characteristics of AP/HTPB propellant under rapid depressurization

The 2D sandwich model serves as a potent tool in exploring the influence of surface geometry on the combustion attributes of Ammonium perchlorate/Hydroxyl-terminated polybutadiene(AP/HTPB)propellant under rapid pressure decay.The thickness of the sandwich propellant is derived from slicing the 3D random particle packing,an approach that enables a more effective examination of the micro-flame structure.Comparative analysis of the predicted burning characteristics has been performed with experimental studies.The findings demonstrate a reasonable agreement,thereby validating the precision and soundness of the model.Based on the typical rapid depressurization environment of solid rocket motor(initial combustion pressure is 3 MPa and the maximum depressurization rate is 1000 MPa/s).A-type(a flatter surface),B-type(AP recesses from the combustion surface),and C-type(AP protrudes from the combustion surface)propellant combustion processes are numerically simulated.Upon comparison of the evolution of gas-phase flame between 0.1 and 1 ms,it is discerned that the flame strength and form created by the three sandwich models differ significantly at the beginning stage of depressurization,with the flame structures gradually becoming harmonized over time.Conclusions are drawn by comparison extinction times:the surface geometry plays a pivotal role in the combustion process,with AP protrusion favoring combustion the most.

The Effects of the Geometry of a Current Collector with an Equal Open Ratio on Output Power of a Direct Methanol Fuel Cell

The open ratio of a current collector has a great impact on direct methanol fuel cell(DMFC)performance.Although a number of studies have investigated the influence of the open ratio of DMFC current collectors,far too little attention has been given to how geometry(including the shape and feature size of the flow field)affects a current collector with an equal open ratio.In this paper,perforated and parallel current collectors with an equal open ratio of 50%and different feature sizes are designed,and the corresponding experimental results are shown to explain the geometry effects on the output power of the DMFC.The results indicate that the optimal feature sizes are between 2 and 2.5 mm for both perforated and parallel flow field in the current collectors with an equal open ratio of 50%.This means that for passive methanol fuel cells,to achieve the highest output power,the optimal feature size of the flow field in both anode and cathode current collectors is between 2 and 2.5 mm under the operating mode of this experiment.The effects of rib and channel position are also investigated,and the results indicate that the optimum pattern depends on the feature sizes of the flow field.

产三峡肽素的草酸青霉SG-4的全基因组测序

为充分解析草酸青霉SG-4的遗传信息,利用二代Illumina测序和三代PacBio测序相结合的方法对SG-4的全基因组进行测序,经过基因组组装、基因预测和功能注释后,对全基因组进行共线性分析和次级代谢产物合成基因簇预测。结果表明,草酸青霉SG-4基因组全长为31.17 Mb,GC含量为50.5%,包括线粒体基因组在内,共由9条基因支架(scaffold)组成,含有8430个蛋白质编码基因、175个tRNA和50个rRNA基因。与swiss-prot、Pfam、NR、GO和KEGG等数据库相比,COG数据库注释的基因数最多,可达7483个。共线性分析结果表明,SG-4与数据库中报道的其他草酸青霉的同源性有一定差异,且存在多处异位重排现象。通过生物信息学分析发现,SG-4基因组中有28个次级代谢产物生物合成基因簇,其中,14个基因簇的功能未见报道,将NRPS相关基因簇与转录组数据进行对应的同时,分析与三峡肽素合成趋势的相关性,得到9条基因簇,经前期实验验证其中有一条可能是负责三峡肽素合成的候选基因簇。研究丰富了草酸青霉的基因组信息,为全面了解草酸青霉的基因组信息、揭示三峡肽素的生物合成途径奠定基础。