Proposing a novel geo-structural model for Torbat-e-Jam-Fariman plain(Northeast of Iran),based on Geomorphic indices calculation,conjugating the field evidences

There are various faults in northern and southern margins of Torbat-e-Jam-Fariman plain which show the probability of enormous earthquake in the future.In present study the geomorphic indices contain Asymmetry Function(Af),Sinuosity of mountain front(Smf),Valley floor index(Vf),Hypsometric index(Hi),Mean Axial slope of channel index(MASC)and Drainage Basin Shape(Bs),have been utilized to determine the relative tectonic activity index(IAT)to recognize,eventually,the geo-structural model of the study area.Faults and folds control the geo-structural activities of the study area,and the geomorphic indices are being affected in consequence of their activities.The intensity of these activities is different throughout the plain.There are many geomorphic evidences,related to active transform fault which are detectable all over the study area such as deviated rivers,quaternary sediments transformation,fault traces.Therefore,recognition of geo-structural model of the study area is extremely vital.Field study,then,approved the results of geomorphic indices calculation in determining the geo-structural model of the study area.Results depicted that the geostructural model of the study area is a kind of Horsetail splay form which is in accordance to the relative tectonic activity of the study area.Based on the above mentioned results it can be predicted that the splays are the trail of Neyshabour fault.

聊城市农田土壤污染评价及农业功能分区

为探索聊城市农田土壤污染状况及农业功能分区,以2017~2020年采集的74个表层土样为研究对象,测定了8种重金属元素(Cd、Hg、As、Cu、Pb、Cr、Zn和Ni)、BHC_(s)、DDT_(s)和BaP的含量。依据《土壤环境质量农用地土壤污染风险管控标准》和《绿色食品产地环境质量》作为评价标准,采用污染指数法开展了土壤环境质量评价和农业功能分区研究。采用ANOVA和LSD多重比较,确定了污染物的空间分布差异及其来源。依据山东省土壤背景值进行了重金属潜在生态风险评价。结果表明,除3个DDTs污染样点和1个Cd污染样点外,其他样点均处于清洁水平。在空间分布上,DDTs和Cr含量存在极显著差异,BaP和Hg存在显著差异。农业功能分区结果表明,绿色食品种植区、无公害食品种植区、观察种植区和污染区面积分别占研究区总面积的78.13%、9.45%、6.52%和5.90%。土壤环境生态风险水平以轻微为主,占总面积的77.03%。Hg和Cd在生态风险评估中占有较大比率,应高度警惕和严格监管。

从“微饮”立论射血分数保留的心力衰竭早期防治思想

射血分数保留的心力衰竭(heart failure with preserved ejection fraction, HFpEF)是目前心血管领域的治疗难点,防治前线前移对于减缓或逆转HFpEF发病进程至关重要。聚焦HFpEF早期的中医防治,是发挥中医治未病优势的关键。通过梳理仲景提出的“微饮”内涵和证治,结合HFpEF早期的发病机制,提出HFpEF早期以微饮内停上焦为主要病机,临证应以苓桂术甘汤为主祛饮通阳,以期阻断饮证进一步发展,截断HFpEF发展进程。从“微饮”立论HFpEF早期防治,可以防微杜渐,具有重要的临床意义。

竹材微炭化干燥工艺中液体产物特性分析

在固定床反应器上采用微炭化工艺干燥处理竹材,并对干燥尾气进行冷凝回收,探讨微炭化干燥工艺对竹材干燥冷凝液体产物特性的影响。研究结果表明:竹材于210℃微炭化干燥处理得到冷凝液体主要含有酸、醛、酯、酮和酚类物质。微炭化工艺对竹材干燥液体产物特性有显著影响,210℃时醛类物质质量分数达22.14%,250℃时醇、酚类物质质量分数分别为25.13%、28.33%;升温速率造成酸、醛类物质先增加后减少,10℃/min时最大,分别为67.89%、22.14%,酮类物质变化趋势则相反,20℃/min时最大,为21.35%;随氮气流量增大,酸类物质增加,由51.84%增至81.71%,醛类、酮类物质减少,分别由26.07%、10.95%降至8.36%、2.58%。竹材微炭化干燥液体产物成分与木、竹醋液相似,具有用作植物生长促进剂、土壤改良剂等潜力。

基于《黄帝内经》“少火生气”理论探析糖尿病性骨质疏松症

探讨“少火生气”理论的内涵,阐述其与糖尿病性骨质疏松症的中医认识,引出“微补”之意,即用少火之品微补人体之阳气与脏腑,从而发挥补益气血,调补脏腑,固精充骨的作用。

“无心”与“几微”之象——对《庄子·天地》篇“象罔”概念的探析

关于《庄子·天地》篇中“象罔”概念,自古以来训者甚众。有从中国传统“象”思维的角度出发将其理解为“似有形而无其形质”的一种“虚象”;也有从“无”的角度将其作“无心”“无形迹”之解的。结合前人“象”与“无”的双重阐释视角,将“象罔”概念作“无心”与“几微”之象加以理解,即以“无心”之状态得“无心之象”而后才能得“道”,同时这一“无心”之象其本身也是一种“几微”之象,是在获得庄子所言“玄珠”之前的一种萌兆。

Semi-hydro-equivalent design and performance extrapolation between 100 kJ-scale and NIF-scale indirect drive implosion

Extrapolation of implosion performance between different laser energy scales is investigated for indirect drive through a semi-hydroequivalent design.Since radiation transport is non-hydro-equivalent,the peak radiation temperature of the hohlraum and the ablation velocity of the capsule ablator are not scale-invariant when the sizes of the hohlraum and the capsule are scale-varied.A semi-hydro-equivalent design method that keeps the implosion velocity V_(i),adiabat α_(F),and P_(L)/R_(hc)^(2) (where P_(L) is the laser power and R_(hc) is the hohlraum and capsule scale length)scale-invariant,is proposed to create hydrodynamically similar implosions.The semi-hydro-equivalent design and the scaled implosion performance are investigated for the 100 kJ Laser Facility(100 kJ-scale)and the National Ignition Facility(NIF-scale)with about 2 MJ laser energy.It is found that the one-dimensional implosion performance is approximately hydro-equivalent when V_(i) and α_(F) are kept the same.Owing to the non-hydro-equivalent radiation transport,the yield-over-clean without α-particle heating(YOC_(noα))is slightly lower at 100 kJ-scale than at NIF-scale for the same scaled radiation asymmetry or the same initial perturbation of the hydrodynamic instability.The overall scaled two-dimensional implosion performance is slightly lower at 100 kJ-scale.The general Lawson criterion factor scales asχ_(noα) ^(2D)∼S^(1.06±0.04)(where S is the scale-variation factor)for the semi-hydro-equivalent implosion design with a moderate YOC_(noα).Our study indicates that χ_(noα)≈0.379 is the minimum requirement for the 100 kJ-scale implosion to demonstrate the ability to achieve marginal ignition at NIF-scale.

Low-Energy Spin Excitations in Detwinned FeSe

Antiferromagnetic spin fluctuation is regarded as the leading driving force for electron pairing in high-Tc superconductors.In iron-based superconductors,spin excitations at low energy range,especially the spin-resonance mode at ER~5kBTc,are important for understanding the superconductivity.Here,we use inelastic neutron scattering(INS)to investigate the symmetry and in-plane wave-vector dependence of low-energy spin excitations in uniaxial-strain detwinned Fe Se.The low-energy spin excitations(E<10 meV)appear mainly at Q=(±1,0)in the superconducting state(T9K)and the nematic state(T90 K),confirming the constant C_(2) rotational symmetry and ruling out the C_(4) mode at E≈3 meV reported in a prior INS study.Moreover,our results reveal an isotropic spin resonance in the superconducting state,which is consistent with the s±wave pairing symmetry.At slightly higher energy,low-energy spin excitations become highly anisotropic.The full width at half maximum of spin excitations is elongated along the transverse direction.The Q-space isotropic spin resonance and highly anisotropic low-energy spin excitations could arise from dyz intra-orbital selective Fermi surface nesting between the hole pocket aroundΓpoint and the electron pockets centered at MX point.

微过充下三元镍钴铝锂离子电池的老化机理

电芯的不一致性及电量不均衡,会导致部分锂离子电池单体出现微过充现象,但此情况对于电池容量的影响未被完全揭示。在不同最高截止电压(4.2 V、4.3 V和4.4 V)下对三元镍钴铝(Li_(x)Ni_(0.80)Co_(0.15)Al_(0.05)O_(2))电池进行恒流充电循环老化实验,采用差分电压分析、电化学阻抗谱(EIS)等测试方法,探究高截止电压循环对电池老化的影响。随着最高截止电压的升高,电池老化速度加快,以2.5 A电流循环280次后,4.2 V、4.3 V、4.4 V下的容量保持率分别为90.30%、88.19%和86.19%。差分电压分析表明,容量衰减加速的原因是正极活性物质损失和活性Li+损失。EIS测试表明,微过充导致固体电解质相界面(SEI)膜阻抗略微升高,电荷转移阻抗升高,且程度随截止电压的升高而增大。

EVENTS CALENDAR

China Sees Rising Retail Sales in Q1 China’s retail sales of consumer goods,a major indicator of the country’s consumption strength,climbed 4.7 percent year on year in the first quarter of 2024.The figure was slightly lower than the 5.5 percent rise registered during the January-February period,according to data from the National Bureau of Statistics(NBS).

EFFECT OF GRAIN REFINING ON PRIMARYαPHASE IN SEMI-SOLID A356 ALLOY PREPARED BY LOW SUPERHEAT POURING AND SLIGHT ELECTROMAGNETIC STIRRING

The semi-solid slurry of A356 alloy, which is grain-refined by Al-Ti-B master alloy, is prepared by low superheat pouring and slight electromagnetic stirring. The effects of grain refining on the morphology and the grain size of the primary α phase in the slurry manufactured are researched. The results indicate that the slurry with particle-like and rosette-like primary α phases can be prepared by low superheat pouring and slight electromagnetic stirring from liquid A356 alloy grain-refined, in which the pouring temperature can be suitably raised. Compared with the A356 samples without grain refining, the grain size and particle morphology of primary α phase as well as the distribution of the grain with particle-like or rosette-like along radial in the ingot in A356 are markedly improved by grain refining.

Effect of a Slight Interfacial Reaction on Mechanical Properties of SiCp/Al Composites

A slight interfacial reaction in squeeze-cast SiCp/6061AI composites has been studied. It is found that this kind of reaction has a particular effect on the mechanical properties of the composites. The results of fie-cure tests show that this reaction in the composites obviously increases the elastic properties, but is not beneficial to the fracture strength and ductility.This phenomenon can be interpreted in terms of two different micromechanisms which have been analyzed using TEM and HREM observations, acoustic emission (AE) technique and SEM fractography. In addition, a new method of SiC surface modification which can control the interface state is initially presented.

A NOVEL SLIGHTLY COMPRESSIBLE MODEL FOR LOW MACH NUMBER PERFECT GAS FLOW CALCULATION

By analyzing the characteristics of low Mach number perfect gas flows, a novel Slightly Compressible Model (SCM) for low Mach number perect gas flows is derived. In view of numerical calculations, this model is proved very efficient, for it is kept within thep-v frame but does not have to satisfy the time consuming divergence-free condition in order to get the incompressible Navier-Stokes equation solution. Writing the equations in the form of conservation laws, we have derived the characteristic systems which are necessary for numerical calculations. A cell-centered finite-volume method with flux difference upwind-biased schemes is used for the equation solutions and a new Exact Newton Relaxation (ENR) implicit method is developed. Various computed results are presented to validate the present model. Laminar flow solutions over a circular cylinder with wake developing and vortex shedding are presented. Results for inviscid flow over a sphere are compared in excellent agreement with the exact analytic incompressible solution. Three-dimensional viscous flow solutions over sphere and prolate spheroid are also calculated and compared well with experiments and other incompressible solutions. Finally, good convergent performances are shown for sphere viscous flows.

Rejuvenating soybean(Glycine max L.)growth and development through slight shading stress

The impact of increased shading stress on agronomic traits,photosynthetic performance and antioxidants activities in leaves of two soybeans cultivars(D16 and E93)was studied.Soybean seedlings were grown in pots and exposed to no shade(S0),slight shade(S1),moderate shade(S2),and heavy shade(S3).Our findings showed that under the S3 in both cultivars,leaf fresh weight(LFW),specific leaf area(SLA)and leaf thickness decreased signifiantly,accompanied by a reduction in photochemical parameters including the maximum quantum yield(Fv/Fm)and electron transport rate(ETR).Furthermore,compared to SO,S1 significantly increased the ETR,sucrose content and the activity of catalase(CAT)in both D16 and E93 cultivars while S2 and S3 decreased the activity.However,under all treatments of shading stress,the antioxidant activities of superoxide dismutase(SOD)and peroxidase(POD)were lowered in both cultivars.Such morphological and physiological plasticity to adapt S1 compensates for the decrease in biomass and leads to seed weight compared to that obtained with an amount of normal light.Through configuring the space in the intercropping systems,S1 could be helpful for optimum growth and yield.Redesigning photosynthesis through S1 for the intercropping systems could be a smart approach.

Treatment of Slightly Polluted Wastewater in an Oil Refinery Using a Biological Aerated Filter Process

The slightly polluted wastewater from oil refinery contains some COD, oil pollutants and suspended solids （SS）. A small-scale fixed film biological aerated filter （BAF） process was used to treat the wastewater. The influences of hydraulic retention time （HRT）, air/water volume flow ratio and backwashing cycle on treatment efficiencies were investigated. The wastewater was treated by the BAF process under optimal conditions： the HRT of 1.0 h, the air/water volume flow ratio of about 5 ： 1 and the backwashing cycle of every 4-7 days. The results showed that the average removal efficiency of COD, oil pollutants and SS was 84.5%, 94.0% and 83.4%, respectively. And the average effluent concentration of COD, oil pollutants and SS was 12.5, 0.27, 14.5 mg·L^-1, respectively. The experimental results demonstrated that the BAF process is a suitable and highly efficient method to treat the wastewater.

An integrated risk sensing system for geo-structural safety

Over the last decades,geo-structures are experiencing a rapid development in China.The potential risks inherent in the huge amount of construction and asset operation projects in China were well managed in the major project,i.e.the project of Shanghai Yangtze tunnel in 2002.Since then,risk assessment of geostructures has been gradually developed from a qualitative manner to a quantitative manner.However,the current practices of risk management have been paid considerable attention to the assessment,but little on risk control.As a result,the responses to risks occurrences after a comprehensive assessment are basically too late.In this paper,a smart system for risk sensing incorporating the wireless sensor network(WSN) on-site visualization techniques and the resilience-based repair strategy was proposed.The merit of this system is the real-time monitoring for geo-structural performance and dynamic pre-warning for safety of on-site workers.The sectional convergence,joint opening,and seepage of segmental lining of shield tunnel were monitored by the micro-electro-mechanical systems(MEMS) based sensors.The light emitting diode(LED) coupling with the above WSN system was used to indicate different risk levels on site.By sensing the risks and telling the risks in real time,the geo-risks could be controlled and the safety of geo-structures could be assured to a certain degree.Finally,a resilience-based analysis model was proposed for designing the repair strategy by using the measured data from the WSN system.The application and efficiency of this system have been validated by two cases including Shanghai metro tunnel and underwater road tunnel.

Application of a Stereo Constructed Wetland Mode to the Treatment of Slightly Polluted Source Water

[Objective] The study aimed to discuss the application of a stereo constructed wetland to the treatment of slightly polluted source water. [Method] In this study, a new stereo constructed wetland mode was put forward, and a pilot project of water ecological purification in Xinsheng River, the diversion channel of Shijiuyang Waterwork in Jiaxing City, were analyzed. Afterwards, the impact factors of water purification by the technology were discussed from water quality and quantity, season and climate, species configuration, management and maintenance. [Result] Under three different hydraulic loading conditions, the pilot project effectively improved water SD and DO level, and reduced SS, CODCr, NH3-N, TN and TP significantly in summer and autumn, so that effluent water quality reached surface water standard at Grade III. [Conclusion] The stereo constructed wetland mode composed of constructed wetland and underwater forest used to treat slightly polluted source water is feasible and has a good promotion prospect.

Biomediated Precipitation of Calcium Carbonate in a Slightly Acidic Hot Spring,Yunnan Province

A slightly acidic hot spring named ＂Female Tower＂（t=73.5°C, pH=6.64） is located in the Jifei Geothermal Field, Yunnan Province, southwestern China. The precipitates in the hot spring are composed of large amounts of calcite, aragonite and sulfur. Scanning electron microscopy（SEM） analyses reveal that the microbial mats were formed from various coccoid or rod-shaped filamentous microbes. Transmission electron microscopy（TEM） shows that the intracellular sulfur granules are commonly associated with these microbes. A culture-independent molecular phylogenetic analysis demonstrates that the majority of the bacteria in the spring are sulfur-oxidizing bacteria. In the spring water, H2S concentration is up to 60 ppm, while SO4-（2-） concentration is only about 10 ppm. We speculate that H2S might derive from sulfur-oxidizing bacteria in this hot spring water, leading to the intracellular formation of sulfur granules. Meanwhile, this reaction increased the p H in the micronscale microdomains, which fosters the precipitation of calcium carbonate in the microbial mats. The results of this study indicate that the sulfur-oxidizing bacteria might play an important role in calcium carbonate precipitation in slightly acidic hot spring environments.

Nonlinear transverse vibrations of a slightly curved beam carrying a concentrated mass

In this study, a slightly curved Euler Bernoulli beam carrying a concentrated mass was handled. The beam was resting on an elastic foundation and simply supported at both ends. Effects of the concentrated mass on nonlin- ear vibrations were investigated. Sinusoidal and parabolic type functions were used as curvature functions. Equations of motion have cubic nonlinearities because of elongations during vibrations. Damping and harmonic excitation terms were added to the equations of motion. Method of mul- tiple scales, a perturbation technique, was used for solving integro-differential equation analytically. Natural frequen- cies were calculated exactly for different mass ratios, mass locations, curvature functions, and linear elastic foundation coefficients. Amplitude-phase modulation equations were found by considering primary resonance case. Effects of nonlinear terms on natural frequencies were calculated. Frequency-amplitude and frequency-response graphs were plotted. Finally effects of concentrated mass and chosen curvature function on nonlinear vibrations were investigated.

Advanced Treatment of Wastewater and Slightly Deteriorated Raw Water by Biological Activated Carbon Method under Rich Oxygen Condition

Rich oxygen-biological activated carbon(RO-BAC)method developed from traditional BAC method is a sys-tem in which high pressure is applied to improve the oxy-gen concentration of the influent.Experiment withwastewater and the slightly deteriorated raw water showsthe system is an effective option for advanced treatmentof industry wastewater and pretreatment of slightly dete-riorated raw water.The experiment results and the in-fluential factors are discussed in this paper.