基于分子跃迁反应的回乡创业者“能量”扩散行为的实证分析--以河南省固始县回乡创业者为例

基于分子能量等概念,探讨了回乡创业者在城市打工过程中的"能量"获取行为,回乡后的"能量"扩散行为及扩散效应:①回乡创业者获取的"能量"与其打工历程密切相关;②人力资本在空间上表现为接触传递及跳跃传递,产业价值链的空间可分性是人力资本扩散的基础;③社会资本在扩散过程中存在突变性,空间距离的增加减少了原有社会关系的利用;④"能量"扩散促使劳动者就近就业,为他们提供了稳定的收入并改变其生产生活行为;⑤"能量"扩散对县域经济的发展意义重大。

从剧场人类学“能量”视角观中国民族民间舞蹈表演

尤金诺·芭芭的《剧场人类学辞典——表演者的秘艺》立足于剧场空间,从不同视角切入,探究了演员实现舞台生命力的可行方法。重点探析该书中的“能量”章节,结合当下中国民族民间舞表演语境,尝试由剧场人类学表演理论中“能量”的观点出发,探讨中国民族民间舞表演的生命力呈现。

基于“能量-碳量”视角的低碳建筑空间营建策略

通过对双碳导向下低碳建筑减碳问题转变、目标强度转向、营建体系转型的发展态势研究,辨析低碳建筑与绿色建筑的内涵分异,厘清低碳建筑“倒逼性存量减排”与绿色建筑“预警性增量节能”之间的理念差异与目标侧重,归纳建筑从绿色到低碳的多元化概念衍生,阐明建筑中能量循环与物质代谢孤立的发展现状。因此,基于“能量-碳量”视角对低碳导向下的建筑能量系统进行多维剖析与整合,建立能量组织机制,促使低碳建筑形成由能量流维稳的动态平衡结构。最后,提出“时峰双控”“倒逼约束”“能量协同”“精准控源”和“源汇平衡”的低碳建筑营建策略路径,为逐级实现我国建筑碳排放“低—零—负”目标提供理论与实践的支持。

基于业务性能偏差感知的电力通信网路由优化策略

针对新兴电力业务对时延、可靠性的严苛要求,提出一种基于业务性能偏差感知的电力通信网路由优化策略。在建立“能量-信息”耦合网络模型基础上,量化分析电力业务转发时延与可靠性约束,设置与能量层、信息层重要度相关的业务效用最大化问题,利用虚拟队列积压感知多跳长时路由优化中的业务性能偏差,基于引入记忆空间的改进SARSA(λ)算法,实现信息不确定场景下的电力通信网路由优化。仿真结果表明,所提算法可有效提升业务效用,在转发时延、丢包率方面性能更优,且可通过权重系数调节适应不同场景的差异化业务需求。

第二代双源双能量CT心肌灌注成像的初步应用

目的:探讨双源双能量CT进行心肌灌注成像的临床应用价值。方法:采用双源CT双能量心肌灌注成像方法对30例受检者进行扫描,对所有冠状动脉图像质量及心肌碘图灌注程度进行评分,并对冠状动脉狭窄程度进行分级,然后对冠状动脉狭窄程度与心肌碘图评分情况进行对照分析。结果:30例受检者冠状动脉CTA图像质量均满足诊断要求。30例受检者中有19例共计36支冠状动脉分支出现不同程度的狭窄或闭塞,其中轻度狭窄22支,中度狭窄6支,重度狭窄7支,次全闭塞1支。30例受检者心肌碘图均可进行碘分布情况评分。510个左室心肌节段中0分21个节段(4.1%),1分75个节段(14.7%),2分218个节段(42.7%),3分196个节段(38.4%)。轻度、中度、重度狭窄及闭塞对应2分以上心肌节段比例分别为85.6%、76.7%、93.0%及100.0%。冠状动脉狭窄程度与心肌灌注评分之间存在不一致。结论:双能量心肌灌注作为"一站式"完成冠状动脉及心肌灌注联合评价的技术具有一定应用潜力。目前校正双能量扫描所产生的各种伪影,提高心肌灌注评分与冠状动脉狭窄程度的一致性是促进该技术广泛应用于临床的关键。

思维导图策略在高中生物学“能量供应”教学中的应用

本文选取高中生物必修1第5章＂细胞的能量供应与利用＂较具有代表性的部分内容,根据课程内容和性质不同,从核心概念、宏观视角及发展变化三个角度,设计直观教学导图,以提高学生对理论课程的理解与认知水平。

基于“能量—故障”诊断模式的转子断条故障在线监测

为了克服转子断条故障特征分量易受基频分量影响的困难 ,采用了一种基于“能量—故障”的诊断模式 ,利用小波理论对电动机定子电流采样信号进行特征频率提取 ,求出对应的能量分布 ,建立了表征转子断条故障的特征向量 ,用模式识别的方法实现了转子断条故障的快速在线监测与诊断。

解决无线传感器网络能量洞问题的贪婪算法

无线传感器网络中的能量洞问题是影响网络寿命的关键因素之一。在基于环模型的多跳传感器网络中,通过优化所有环的传输距离可以有效地延长网络寿命。提出了一种近似的贪婪算法(ASGT),该算法将最优传输距离序列问题转化为最优生成树问题,在降低搜索(算法)复杂度的同时得到与最优解近似的结果。模拟实验证明了采用ASGT算法的网络寿命逼近于理想最优序列下的网络生命时间,并且与已有的文献算法相比,ASGT可以延长网络寿命两倍以上。

Mechanical response and dilatancy characteristics of deep marble under different stress paths:A sight from energy dissipation

Dilatancy is a fundamental volumetric growth behavior observed during loading and serves as a key index to comprehending the intricate nonlinear behavior and constitutive equation structure of rock.This study focuses on Jinping marble obtained from the Jinping Underground Laboratory in China at a depth of 2400 m.Various uniaxial and triaxial tests at different strain rates,along with constant confining pressure tests and reduced confining pressure tests under different confining pressures were conducted to analyze the mechanical response and dilatancy characteristics of the marble under four stress paths.Subsequently,a new empirical dilatancy coefficient is proposed based on the energy dissipation method.The results show that brittle failure characteristics of marble under uniaxial compression are more obvious with the strain rate increasing,and plastic failure characteristics of marble under triaxial compression are gradually strengthened.Furthermore,compared to the constant confining pressure,the volume expansion is relatively lower under unloading condition.The energy dissipation is closely linked to the process of dilatancy,with a rapid increase of dissipated energy coinciding with the beginning of dilatancy.A new empirical dilatancy coefficient is defined according to the change trend of energy dissipation rate curve,of which change trend is consistent with the actual dilatancy response in marble under different stress paths.The existing empirical and theoretical dilatancy models are analyzed,which shows that the empirical dilatancy coefficient based on the energy background is more universal.

Modeling and Analysis of Vibration Characteristics of Rectangular Plate with Circular Through Hole Under Complex Boundary Conditions

This paper presents a method to study the free vibration of a plate with circular holes.The circular hole is regarded as a virtual small plate in which the mass density and Young's modulus are zero.Therefore,the free vibration problem of the circular hole plate can be transformed into the free vibration problem of the equivalent rectangular plate with non-uniform thickness.The model is derived from the spectral geometry method(SGM),and the displacement of the plate with circular holes is expanded by the modified Fourier series.Virtual springs are added to the boundary of the plate to simulate the boundary conditions of simply supported and fixed supports.The accuracy of this method is verified by comparison with the finite element calculation results.The relationship between modal numerical solutions of plates with circular holes and boundary conditions and geometry of the plate is studied.

Modified multiple-component scattering power decomposition for PolSAR data based on eigenspace of coherency matrix

A modified multiple-component scattering power decomposition for analyzing polarimetric synthetic aperture radar(PolSAR)data is proposed.The modified decomposition involves two distinct steps.Firstly,ei⁃genvectors of the coherency matrix are used to modify the scattering models.Secondly,the entropy and anisotro⁃py of targets are used to improve the volume scattering power.With the guarantee of high double-bounce scatter⁃ing power in the urban areas,the proposed algorithm effectively improves the volume scattering power of vegeta⁃tion areas.The efficacy of the modified multiple-component scattering power decomposition is validated using ac⁃tual AIRSAR PolSAR data.The scattering power obtained through decomposing the original coherency matrix and the coherency matrix after orientation angle compensation is compared with three algorithms.Results from the experiment demonstrate that the proposed decomposition yields more effective scattering power for different PolSAR data sets.

Effects of temperature, particle size, and air humidity on sensibility of typical high-energetic explosives

The production and utilization of high-energetic explosives often pose a range of safety hazards,with sensitivity being a key factor in evaluating these risks.To investigate how temperature,particle size,and air humidity affect the responsiveness of commonly used high-energetic explosives,a series of BAM(Bundesanstalt für Materialforschung und-prüfung)impact and friction sensitivity tests were carried out to determine the critical impact energy and critical load pressure of four representative high-energetic explosives(RDX,HMX,PETN and CL-20)under different temperatures,particle sizes,and air humidity conditions.The experimental findings facilitated an examination of temperature and particle size affecting the sensitivity of high-energetic explosives,along with an assessment of the influence of air humidity on sensitivity testing.The results clearly indicate that high-energetic explosives display a substantial decline in critical reaction energy when subjected to micrometre-sized particles and an air humidity level of 45%at a temperature of 90℃.Furthermore,it was noted that the critical reaction energy of high-energetic explosives diminishes with an increase in temperature within 25℃−90℃.In the same vein,as the particle sizes of high-energetic explosives increase,so does the critical reaction energy for micrometre-sized particles.High air humidity significantly affects the sensitivity testing of high-energetic explosives,emphasizing the importance of refraining from conducting sensitivity tests in such conditions.

Load-bearing characteristics and energy evolution of fractured rock masses after granite and sandstone grouting

Experiments on grouting-reinforced rock mass specimens with different particle sizes and features were carried out in this study to examine the effects of grouting reinforcement on the load-bearing characteristics of fractured rock mass.The strength and deformation features of grouting-reinforced rock mass were analyzed under different loading manners;the energy evolution mechanism of grouting-reinforced rock mass specimens with different particle sizes and features was investigated;the energy dissipation ratio and post-peak stress decreasing rate were employed to evaluate the bearing stability of grouting-reinforced rock mass.The results show that the strength and ductility of granite-reinforced rock mass(GRM)under biaxial loading are higher than that of sandstone-reinforced rock mass(SRM)under uniaxial loading.Besides,the energy evolution characteristics of grouting-reinforced rock mass under uniaxial and biaxial loading mainly could be divided into early,middle,and late stages.In the early stage,total,elastic,and dissipation energies were quite small with flatter curves;in the middle stage,elastic energy increased rapidly,whereas dissipation energy increased slowly;in the late stage,dissipation energy increased sharply.The energy dissipation ratio was used to represent the pre-peak plastic deformation.Under uniaxial loading,this ratio increased as the particle size increased and the pre-peak plastic deformation of grouting-reinforced rock mass became larger;under biaxial loading,it dropped as the particle size increased,and the pre-peak plastic deformation of grouting-reinforced rock mass became smaller.The post-peak stress decline rate A_(v) was used to assess the post-peak bearing performance of grouting-reinforced rock mass.Under uniaxial loading,parameter A_(v) exhibited reduction as the particle size kept increasing,and the ability of post-peak of grouting-reinforced rock mass to allow deformation development was greater,and the bearing capacity was greater;under biaxial loading,A_(v) increased with the particle size,and the ability of post-peak of grouting-reinforced rock mass to allow deformation development was low and the bearing capacity was reduced.The findings are considered instrumental in improving the stability of the roadway-surrounding rock by granite and sandstone grouting.

Damage effect and mechanisms of cyclophosphamide to human neuroblastoma SH-SY5Y cells

OBJECTIVE To investigate the damage effect and mechanisms of cyclophosphamide(CTX)and its active metabolite derivative 4-hydroperoxycyclophosphamide(4-HC)to human neuroblas⁃toma SH-SY5Y cells.METHODS SH-SY5Y cells were treated with CTX[0(cell control),0.01,0.1,1,5,10,20,40 and 80 mmol·L^(-1)]and 4-HC[0(cell control),0.01,0.1,1,5,10,20,40 and 80μmol·L^(-1)]for 48 h.Cell confluence and morphology were observed by the IncuCyte ZOOM system.Cell viability was assessed by CCK-8 assay.Lactate dehydrogenase(LDH)release was measured by LDH assay kit.SH-SY5Y cells were treated with CTX(0,1,5,10 and 20 mmol·L^(-1))and 4-HC(0,1,5,10 and 20μmol·L^(-1))for 48 h before cell proliferation was analyzed by 5-ethynyl-2′-deoxyuridine(EdU)staining assay.Immunofluorescence was employed to assess the levels of the DNA double-strand break markerγ-H2AX and to evaluate changes in mitochondrial membrane potential.SH-SY5Y cells were treated with CTX(0,1,5 and 10 mmol·L^(-1))and 4-HC(0,1,5 and 10μmol·L^(-1))for 48 h,and the alterations in glycolysis and oxidative phosphorylation levels were analyzed using the Seahorse XFe96 Analyzer.RESULTS Compared with the cell control group,cell confluence and cell viability were significantly reduced in the CTX and 4-HC groups(P<0.01),and the half-maximal inhibitory concentrations(IC50)for CTX and 4-HC were 4.44 mmol·L^(-1) and 4.78μmol·L^(-1),respectively.The release rate of LDH was signif⁃icantly increased while the percentage of EdU+cells was significantly reduced in the CTX and 4-HC groups(P<0.01).The percentage ofγ-H2AX+cells was significantly increased and mitochondrial membrane potential significantly decreased in the CTX and 4-HC group(P<0.05).Treatment with CTX and 4-HC resulted in reduced levels of maximum glycolytic capacity,glycolytic reserve,maximal respi⁃ration,and ATP production(P<0.05).CONCLUSION CTX and 4-HC exert significant cytotoxic effects on SH-SY5Y cells by disrupting cell membrane structure,impeding cell proliferation,and reducing cell viability.The mechanisms underlying these effects may involve intracellular DNA damage,disturbance of energy metabolism and mitochondrial dysfunction.

Short-term prediction of photovoltaic power generation based on LMD-EE-ESN with error correction

Considering the instability of the output power of photovoltaic(PV)generation system,to improve the power regulation ability of PV power during grid-connected operation,based on the quantitative analysis of meteorological conditions,a short-term prediction method of PV power based on LMD-EE-ESN with iterative error correction was proposed.Firstly,through the fuzzy clustering processing of meteorological conditions,taking the power curves of PV power generation in sunny,rainy or snowy,cloudy,and changeable weather as the reference,the local mean decomposition(LMD)was carried out respectively,and their energy entropy(EE)was taken as the meteorological characteristics.Then,the historical generation power series was decomposed by LMD algorithm,and the hierarchical prediction of the power curve was realized by echo state network(ESN)prediction algorithm combined with meteorological characteristics.Finally,the iterative error theory was applied to the correction of power prediction results.The analysis of the historical data in the PV power generation system shows that this method avoids the influence of meteorological conditions in the short-term prediction of PV output power,and improves the accuracy of power prediction on the condition of hierarchical prediction and iterative error correction.

Ballistic Penetration Damage of Hybrid Thermoplastic Composites Reinforced with Kevlar and UHMWPE Fabrics

Polymer matrix types of fiber hybrid composites are key factors to improve ballistic impact damage tolerances.Here we report ballistic penetration damages of Kevlar/ultra-high molecular weight polyethylene(UHMWPE)hybrid composites with thermoplastic polyurethane(PU)matrix.The hybrid composites were penetrated by fragment-simulating projectiles(FSPs)using an air gun impact system.The effects of stacking sequences on the ballistic performance of hybrid composites were analyzed.Two types of specific energy absorption(the energy absorption per unit area density and the energy absorption per unit thickness)were investigated.It was found that the main damage modes of PU hybrid composites were fiber breakage,matrix damage,fiber pullout and interlayer delamination.The instantaneous deformation could not be used as a reference index for evaluating the ballistic performance of the target plate.The energy absorption process of the PU hybrid composites showed a nonlinear pattern.The hybrid structure affected the specific energy absorption of the materials.

Deep learning models semi-automatic training system for quality control of transthoracic echocardiography

Objective To explore the value of deep learning(DL)models semi-automatic training system for automatic optimization of clinical image quality control of transthoracic echocardiography(TTE).Methods Totally 1250 TTE videos from 402 patients were retrospectively collected,including 490 apical four chamber(A4C),310 parasternal long axis view of left ventricle(PLAX)and 450 parasternal short axis view of great vessel(PSAX GV).The videos were divided into development set(245 A4C,155 PLAX,225 PSAX GV),semi-automated training set(98 A4C,62 PLAX,90 PSAX GV)and test set(147 A4C,93 PLAX,135 PSAX GV)at the ratio of 5∶2∶3.Based on development set and semi-automatic training set,DL model of quality control was semi-automatically iteratively optimized,and a semi-automatic training system was constructed,then the efficacy of DL models for recognizing TTE views and assessing imaging quality of TTE were verified in test set.Results After optimization,the overall accuracy,precision,recall,and F1 score of DL models for recognizing TTE views in test set improved from 97.33%,97.26%,97.26%and 97.26%to 99.73%,99.65%,99.77%and 99.71%,respectively,while the overall accuracy for assessing A4C,PLAX and PSAX GV TTE as standard views in test set improved from 89.12%,83.87%and 90.37%to 93.20%,90.32%and 93.33%,respectively.Conclusion The developed DL models semi-automatic training system could improve the efficiency of clinical imaging quality control of TTE and increase iteration speed.

“能量投入产出法”在天津市农业投资经济效果分析中的应用

采用能量投入产出法分析农业投资效果,可以克服价格单位和实物单位的不足。本文对天津市农业投资效果进行了分析,提出结论和建议。

在“真实”中看到成长——“能量—释放通道”理论运用实例

本文借助"能量—释放通道"理论,描述学生个体最真实的关键事件,包括其情绪关键事件和能量释放关键事件,编码分析其能量及释放通道,进而得出具有前瞻性和指导性的行动契约内容和效果评估,希望能够帮助教师应用更加科学、切合的方式促进学生成长。