Effect of Polyaniline/manganese Dioxide Composite on the Thermoelectric Effect of Cement-based Materials

To enhance the thermoelectric effect of cement-based materials,conductive polyaniline(PANI)modified MnO_(2)powder was synthesized and used as a thermoelectric component in the cement composites.The nanostructured PANI was deposited on the surface of the nanorod-shapedα-MnO_(2)particle and the weight ratio of PANI to MnO_(2)was 22.3:77.7 in the composite.The synthesized PANI/MnO_(2)composite was nanostructured according to the SEM image.The test results of the thermoelectric properties proved that the PANI/MnO_(2)composite was effective as the Seebeck coefficient and electrical conductivity values of the cement composites with PANI/MnO_(2)inside were 3-4 orders of magnitude higher than those of pure cement paste and the thermal conductivity values of these cement samples were similar.The obtained maximum figure of merit(ZT)value(2.75×10^(-3))was much larger than that of conductive materials reinforced cement-based composites.The thermoelectric effect of cement composites is mainly enhanced by the increased Seebeck coefficient and electrical conductivity in this work.

Exploring the autophagy-related pathogenesis of active ulcerative colitis

BACKGROUND The pathogenesis of ulcerative colitis(UC)is complex,and recent therapeutic advances remain unable to fully alleviate the condition.AIM To inform the development of novel UC treatments,bioinformatics was used to explore the autophagy-related pathogenesis associated with the active phase of UC.METHODS The GEO database was searched for UC-related datasets that included healthy controls who met the screening criteria.Differential analysis was conducted to obtain differentially expressed genes(DEGs).Au-tophagy-related targets were collected and intersected with the DEGs to identiy differentially expressed autophagy-related genes(DEARGs)associated with active UC.DEARGs were then subjected to KEGG,GO,and DisGeNET disease enrichment analyses using R software.Differential analysis of immune infiltrating cells was performed using the CiberSort algorithm.The least absolute shrinkage and selection operator algorithm and protein-protein interaction network were used to narrow down the DEARGs,and the top five targets in the Dgree ranking were designated as core targets.RESULTS A total of 4822 DEGs were obtained,of which 58 were classified as DEARGs.SERPINA1,BAG3,HSPA5,CASP1,and CX3CL1 were identified as core targets.GO enrichment analysis revealed that DEARGs were primarily enriched in processes related to autophagy regulation and macroautophagy.KEGG enrichment analysis showed that DEARGs were predominantly associated with NOD-like receptor signaling and other signaling pathways.Disease enrichment analysis indicated that DEARGs were significantly linked to diseases such as malignant glioma and middle cerebral artery occlusion.Immune infiltration analysis demonstrated a higher presence of immune cells like activated memory CD4 T cells and follicular helper T cells in active UC patients than in healthy controls.CONCLUSION Autophagy is closely related to the active phase of UC and the potential targets obtained from the analysis in this study may provide new insight into the treatment of active UC patients.

Fluorographene with Narrow Lateral Size and Thickness Distributions Prepared for Enhancing Lubrication Performance of Bentonite Grease

Fluorographene(FG)with narrow lateral size and thickness distributions was prepared by a liquid-phase exfoliation method,based on liquid cascade centrifugation.The Rtec MFT-5000 tribo-meter was used to investigate the lubricating performance of bentonite grease enhanced by the as-prepared FG.The results showed that the coefficient of friction and the wear volume of bentonite grease with 0.3 wt%FG were decreased by 20.4%and 44.9%,respectively,as compared to those of the base grease.The main reason is that FG can promote the formation of the tribo-chemical reaction film consisting of complex carbon oxide,Fe_(2)O_(3)and FeF_(3)on the friction surface,which can remarkably improve the performance of friction reduction and prevent the appearance of severe wear.

Genome-Wide Characterization of the Hyaluronidase Gene Family and Their Potential Roles in Viviparous Black Rockfish(Sebastes schlegeli)

Black rockfish(Sebastes schlegelii)has evolved viviparous reproduction mode.Different from the oviparous fishes,the spermatozoa of black rockfish are stored on the surface of ovarian follicle for over four months until the egg mature in ovary,while the adaptive evolution of fertilization-related genes remains to be studied.In the present study,based on the genome and transcriptome information of black rockfish,a total of 10 hyaluronidase genes were identified by phylogenetic and sequence analyses,including hyal1,hyal2,hyal3,hyal4,hyal6 and spam1a,spam1b,spam1c and spam1d.The spam1 subfamilies,including spam1a,spam1b,spam1c and spam1d,were significantly expanded compared to other species.The adaptive evolution of hyaluronidase was further investigated by selection pressure analysis of branch model and branch site model.The results showed that only spam1 subfamily was positively selected with a large number of positive selection sites,and the evolution rate was significantly higher thanthose of other teleosts.Two positively selected sites,LYS-171 and GLY-164,were located in the neutral hyaluronidase activity domain,which was pivotal for SPAM1 to participate in enzymatic hydrolysis of the extracellular hyaluronic acid matrix and mediate acrosome reaction in mammals.Furthermore,spam1 was mainly expressed in spermatocytes,secondary spermatocytes,and spermatids of testis,whereas it was not found in metamorphic sperm and mature sperm based on the spatiotemporal expression analysis.All results indicated that spam1 might originate from the testis and might be an adaptation of viviparous trait in black rockfish.

20-HETE作用受体的发现及其对高血压的影响

花生四烯酸(arachidonic acid,AA)可通过环氧合酶和脂氧合酶代谢途径生成白三烯类、前列腺素类和血栓素类等物质[1]。近年研究发现,AA经过细胞色素P450(cytochrome P450,CYP)代谢途径中的表氧化酶作用可生成环氧二十碳四烯酸(epoxyeicosatrienoic acids,EETs),经过羟化酶作用生成羟基二十碳四烯酸(hydroxyeicosatetraeonic acids,HETEs),如20-羟基二十碳四烯酸(20-hydroxyeicosatetraenoic acid,20-HETE)。

Three-Dimensional Modelling of a Multi-Layer Sandstone Reservoir： the Sebei Gas Field, China

Multi-layer sandstone reservoirs occur globally and are currently in international production. The 3D characteristics of these reservoirs are too complicated to be accurately delineated by general structural-facies-reservoir modelling. In view of the special geological features, such as the vertical architecture of sandstone and mudstone interbeds, the lateral stable sedimentation and the strong heterogeneity of reservoir poroperm and fluid distribution, we developed a new three-stage and six-phase procedure for 3D characterization of multi-layer sandstone reservoirs. The procedure comprises two-phase structural modelling, two-phase facies modelling and modelling of two types of reservoir properties. Using this procedure, we established models of the formation structure, sand body structure and microfacies, reservoir facies and properties including porosity, permeability and gas saturation and provided a 3D fine-scale, systematic characterization of the Sebei multi-layer sandstone gas field, China. This new procedure, validated by the Sebei gas field, can be applied to characterize similar multi-layer sandstone reservoirs.

Tribological Characteristics of Graphene as Lithium Grease Additive

The tribological properties of graphene(GN) and graphite(G) as lubricant additives in lithium greases were investigated with a four-ball tribotester. The micro-morphology as well as the content and chemical state of elements on the worn surfaces was characterized by scanning electron microscopy(SEM) and X-ray photoelectron spectroscopy(XPS). The results showed that the tribological performance of lithium grease could be significantly improved by the addition of graphene. During the friction process, an adhesion film and a deposition film consisted of graphene as well as a tribochemical reaction film composed of FeO, Fe_2O_3, FeOOH and LiOH could be formed on the tribosurface, and these complex films were responsible for the improved tribological performance of lithium grease.

Observed features of temperature, salinity and current in central Chukchi Sea during the summer of 2012

During the summer of 2012, the fifth CHINARE Arctic Expedition was carried out, and a submersible mooring system was deployed in M5 station located at （69°30.155＇N,169°00.654＇W） and recovered 50d later. A set of temperature, salinity and current profile records was acquired. The characteristics of these observations are analyzed in this paper. Some main results are achieved as below. （1） Temperature generally decreases while salinity generally increases with increasing depth. The average values of all records are 2.98℃ and 32.21 psu. （2） Salinity and temperature are well negatively correlated, and the correlation coefficient between them is -0.84. However, they did not always vary synchronously. Their co-variation featured different characters during different significant periods. （3） The average velocity for the whole water column is 141 mm/s with directional angle of 347.1°. The statistical distribution curve of velocity record number gets narrower with increasing depth. More than 85% of the recorded velocities are northward, and the mean magnitudes of dominated northward velocities are 100-150 mm/s. （4） Rotary spectrum analysis shows that motions with low frequency take a majority of energy in all layers. The most significant energy peaks for all layers are around 0.012 cph （about 3.5 d period）, while the tidal motion in mooring area is nonsignificant. （5） Velocities in all layers feature similar and synchronous temporal variations, except for the slight decrease in magnitude and leftward twist from top to bottom. The directions of velocity correspond well to those of Surface wind. The average northward volume transport per square meter is 0.1-0.2 m3/s under southerly wind, but about -0.2 m3/s during northerly wind burst.

Effects of Organosilane-modified PCE on the Fluidity and Hydration Properties of Cement-Fly Ash Composite Binder

Effects of organosilane-modified PCE (OS-PCE) on the fluidity and the hydration properties of cement-fly ash (FA) composite binder were systematically analyzed.The experimental results show that OS-PCE possesses respectively 36.98% and 36.67% higher saturated adsorption amount on cement and FA,in comparison with ordinary PCE,and can contribute to higher fluidity of cement-FA composite binder.The addition of OS-PCE retards hydration process of cement-FA composite binder proportionally with the dosage of OS-PCE,but promotes the hydration kinetics of the composite binder.The reactivity enhancement is attributed to the well-dispersed FA by OS-PCE,which provides more nucleation sites for the reaction of heterogeneous C-S-H and enhances the contact with water to react with CH forming pozzolanic C-S-H.Well-distributed hydration products are exhibited in the hardened binder added with OS-PCE,with a large number of hydrated gels uniformly fill in the pores and gaps,which improves the compaction of the hardened structure.

神经根型颈椎病患者颈椎五步操临床应用研究

目的:观察颈椎五步操康复锻炼对神经根型颈椎病(cervical spondylotic radiculopathy,CSR)患者的康复效果。方法:将90例CSR保守治疗患者按随机数字表法随机分为试验组和对照组各45例。对照组采取基础护理措施,试验组在对照组基础护理措施基础上进行颈椎五步操康复锻炼。比较两组患者入院及出院后各时间点颈椎功能障碍指数量表(neck disability index,NDI)评分、视觉模拟量表(visual analogue scale,VAS)评分、颈椎关节活动度评分变化情况。结果:出院后各时间点两组患者NDI、VAS评分均低于入院时(P<0.01),两组患者颈椎关节活动范围均较入院时改善(P<0.05),试验组改善优于对照组(P<0.01)。结论:颈椎五步操能够有效缓解CSR患者颈痛,改善患者颈椎功能及颈椎关节活动度。

局部和全局特征融合的太阳能电池片表面缺陷检测

太阳能电池片表面缺陷具有类内差异大、类间差异小和背景特征复杂等特点,因此,要实现高精度的太阳能电池片表面缺陷自动检测是一项富有挑战性的任务。针对此问题,该文提出融合局部和全局特征的卷积视觉Transformer网络(CViT-Net),首先采用Ghost聚焦(G-C2F)模块提取电池片缺陷局部特征;然后引进坐标注意力强调缺陷特征并抑制背景特征;最后构建Ghost视觉(G-ViT)模块融合电池片缺陷局部特征和全局特征。同时,针对不同检测精度和模型参数量,分别提供了CViT-Net-S和CViT-Net-L两种网络结构。实验结果表明,与经典MobileVit、MobileNetV3和GhostNet轻量级网络相比,CViT-Net-S对电池片分类准确率分别提升了1.4%、2.3%和1.3%,对电池片检测mAP50分别提升了2.7%、0.3%和0.8%;与ResNet50、RegNet网络相比,CViT-Net-L分类准确率分别提升了0.72%和0.7%,检测mAP50分别提升了3.9%、1.3%;与先进YOLOv6、YOLOv7和YOLOv8检测网络相比,作为骨干网络的CViT-Net-S、CViT-Net-L结构在mAP和mAP50指标上仍保持良好检测效果。结果证明本文算法在太阳能电池片表面缺陷检测领域具有应用价值。

Synthesis and Tribological Properties of Graphene-Copper Nanoparticle Composites as Lithium Grease Additive

In this paper, the graphene-copper nanoparticle composites(GN/Cu NPs) were prepared by in situ chemical reduction in aqueous solution. The influence of pH value and the concentration of PVP on the particle size and structure of the GN/Cu NPs as well as the element distribution were analyzed via the scanning electron microscopy(SEM), the transmission electron microscopy(TEM), the X-ray diffraction(XRD), and the energy dispersive spectroscopy(EDS). The tribological properties of the grease with GN/Cu NPs composites have been studied by SRV-IV. It was found that compared to the base grease, the GN/Cu NPs composites could help to reduce the wear loss of the disk by 85.5% and the average friction coefficient by 15.5%. The test results clearly indicated that the addition of the GN/Cu NPs composites significantly enhanced the tribological properties of grease.

认知行为干预对上消化道早癌行内镜下黏膜剥离术患者的效果研究

目的探讨基于人文关怀理念的认知行为干预对上消化道早癌患者疼痛、心理和康复效果的影响。方法选择196例上消化道早期癌症行内镜下黏膜剥离术(ESD)患者,随机分为对照组和观察组,每组98例。对照组给予上消化道早癌ESD知识宣教,观察组在此基础上给予基于人文关怀理念的认知行为干预。比较2组康复情况、疼痛视觉模拟评分法(VAS)评分、焦虑自评量表(SAS)评分、一般自我效能感量表(GSES)评分、术后并发症。结果观察组的术后肛门排气时间、术后首次排便时间和术后住院时间为(24.67±8.25)h、(43.90±10.27)h、(9.38±2.02)d,分别短于对照组的(27.83±9.40)h、(50.03±12.85)h、(10.26±2.37)d;手术24、48、72 h后观察组VAS评分为(2.63±0.67)、(1.84±0.52)、(1.33±0.38)分,分别低于对照组的(2.89±0.70)、(2.06±0.58)、(1.47±0.42)分;观察组干预后SAS评分为(38.73±7.40)分,低于对照组的(42.05±8.01)分;观察组干预后的GSES评分为(31.53±6.27)分,高于对照组的(29.28±5.96)分,差异均有统计学意义(P<0.05)。2组总并发症发生率比较,差异无统计学意义(P>0.05)。结论对上消化道早癌患者实施基于人文关怀理念的认知行为干预可减轻疼痛和焦虑情绪,促进患者快速康复。

SHEL模型在降低手术室术后切口感染中的应用研究

目的:评价SHEL模型在手术室术后切口感染控制中的应用价值。方法:选择2021年1—6月完成Ⅰ、Ⅱ类手术的10312例患者作为对照组,2021年7—12月完成Ⅰ、Ⅱ类手术的10432例患者作为观察组,对照组采用常规方法控制,观察组采用SHEL模型实施手术切口感染控制管理,比较两组患者手术室卫生学监测结果及护理质量和切口感染率。结果:观察组手术室空气卫生学监测合格率、物体表面卫生学监测合格率及医务人员手消毒合格率(99.21%、98.33%、98.89%)均高于对照组(94.44%、83.33%、89.44%,均P<0.05);干预后手术室各项护理质量评分均高于对照组(均P<0.05);Ⅰ、Ⅱ类手术切口感染率及总感染率(0.07%、2.27%、0.99%)均低于对照组(0.28%、7.92%、3.47%,均P<0.05)。结论:应用SHEL模型实施手术室切口感染控制管理,有利于降低手术切口感染率,提高手术室管理质量,值得临床推广。

气膀胱腹腔镜Cohen手术在输尿管末端疾病中的应用及疗效分析

目的:探讨气膀胱腹腔镜Cohen手术治疗输尿管末端疾病的疗效。方法:回顾分析2011年5月至2021年12月收治的膀胱输尿管反流及输尿管末端梗阻患儿的临床资料。患儿均行输尿管膀胱再植手术,根据手术入路分为开放组(n=48)与气膀胱腹腔镜组(气膀胱组,n=70),对比分析两组手术时间、切口长度、术后肉眼血尿时间、住院时间、肾输尿管积水恢复情况、术后并发症、再手术率等指标。结果:两组患儿年龄、体重、疾病类型、肾输尿管积水严重程度等差异均无统计学意义。与开放组相比,气膀胱组应用血制品少(P=0.001)、切口长度短(P<0.001)、黏膜下隧道与输尿管末端直径比大(P=0.001)、术后肉眼血尿时间短(P=0.005)、术后留置尿管时间短(P=0.023)、术后住院时间短(P<0.001),但手术时间长(P<0.001)。两组患儿术后肾输尿管积水情况均明显改善,气膀胱组较开放组肾盂积水改善更明显(P=0.035)。两组术后应用止疼药、住院期间泌尿系统感染发生率、术后反流与再梗阻、长期排尿异常及再次手术率差异无统计学意义。结论:治疗输尿管末端疾病,气膀胱腹腔镜Cohen手术相较传统开放手术具有美观、损伤小、术后康复快的优点,是安全、有效并值得推广的术式。

Effect of Nitrogen and Phosphorus on Tissue Nutrition and Biomass of Freshwater Wetland Plant in Sanjiang Plain,Northeast China

Nitrogen (4, 10, 20 and 40g/m2) and phosphorus (1.2, 4.8 and 9.6g/m2) were applied to tanks to evaluating the effects of N and P additions on plant tissue nutrition and the biomass of two freshwater wetland plants in the Sanjiang Plain of Northeast China, namely Carex lasiocarpa and Carex meyeriana. For C. lasiocarpa, the total N concentration (TN) of plant tissues under the treatment of 10g/m2 was lower compared with the other N treatments. Initially, C. lasiocarpa exhibited a significant increase of biomass as compared with the control value, reaching the maximum of 31.20±4.01g/tank under the treatment of 10g/m2, and then dropped to 18.02±1.53g/tank under the treatment of 40g/m2. For C. meyeriana, TN generally increased with increasing amount of N applied. High N applied produced more aboveground biomass than low N applied. C. meyeriana, as the accompanying species, can adapt itself to the wetland enriched by N, and it may replace C. lasiocarpa as the dominant species of wetland. The total P concentration (TP) in tissues of C. lasiocarpa increased with P addition. The aboveground biomass of C. lasiocarpa increased with P addition, and it changed from 18.77±3.29g/tank to 46.03±3.95g/tank. However, TP of tissue may accelerate the C. meyeriana development under the treatment of 1.2g/m2. P accumulation contributes to the dominance of C. lasiocarpa but limits the production of C. meyeriana, and the latter may disappear gradually from the wetland enriched by P. Increased input of N and P might have an influence on wetland plant community composition and structure, so the effects of nutrient inputs and accumulation should be considered to protect the freshwater wetland.

Variation in the temperature field of rocks overlying a high-temperature cavity during underground coal gasification

High temperature affects rocks in a way that changes the physical and mechanical properties of them. The temperature field in rock overlying a high temperature zone has been estimated using experimental research on thermal conductivity of the overlying strata. Numerical analysis software was used to esti- mate rock thermal conductivity at different temperatures. These estimates were then used with COMSOL Multiphysics to perform a numerical analysis with the heat conduction model. The results show that rock thermal conductivity decreases as the temperature increases and that various lithologies show similar behavior. The thermal conductivity of each rock type differs from the others at a given temperature. Exact values for the temperature distribution in the overlying strata during the process of underground coal gasification are obtained from the numerical simulation. The temperature in the rock changes with the height and direction from the gasifier. Temperature gradients vary for different types of rock. This result provides an important reference for further study of the strength of overlying strata subject to the process of underground coal gasification.

The distribution and inter-annual variation of water masses on the Bering Sea shelf in summer

On the basis of the CTD data obtained within the Bering Sea shelf by the Second to Sixth Chinese National Arctic Research Expedition in the summers of 2003, 2008, 2010, 2012 and 2014, the classification and interannual variation of water masses on the central Bering Sea shelf and the northern Bering Sea shelf are analyzed. The results indicate that there are both connection and difference between two regions in hydrological features. On the central Bering Sea shelf, there are mainly four types of water masses distribute orderly from the slope to the coast of Alaska： Bering Slope Current Water（BSCW）, MW（Mixed Water）, Bering Shelf Water（BSW） and Alaska Coastal Water（ACW）. In summer, BSW can be divided into Bering Shelf Surface Water（BSW_S） and Bering Shelf Cold Water（BSW_C）. On the northern Bering Sea shelf near the Bering Strait,it contains Anadyr Water（AW）, BSW and ACW from west to east. But the spatial-temporal features are also remarkable in each region. On the central shelf, the BSCW is saltiest and occupies the west of 177°W, which has the highest salinity in 2014. The BSW_C is the coldest water mass and warmest in 2014; the ACW is freshest and mainly occupies the east of 170°W, which has the highest temperature and salinity in 2012. On the northern Bering Sea shelf near the Bering Strait, the AW is saltiest with temperature decreasing sharply compared with BSCW on the central shelf. In the process of moving northward to the Bering Strait, the AW demonstrates a trend of eastward expansion. The ACW is freshest but saltier than the ACW on the central shelf,which is usually located above the BSW and is saltiest in 2014. The BSW distributes between the AW and the ACW and coldest in 2012, but the cold water of the BSW_C on the central shelf, whose temperature less than 0°C, does not exist on the northern shelf. Although there are so many changes, the respond to a climate change is synchronized in the both regions, which can be divided into the warm years（2003 and 2014） and cold years（2008, 2010 and 2012）. The year of 2014 may be a new beginning of warm period.

Physicochemical and Tribological Properties of Anti-Seize Thread Lubricant

The di-aromatics base oil and graphite powder,blended with the viscosity index improver,and the anti-oxidant and rheological additive,were used to prepare a kind of anti-seize thread lubricant.Its physical chemistry properties,such as water resistance,thermal oxidation and aging properties,and tribological performance,were evaluated and compared with those of some commercial products.The results show that the overall performance of the anti-seize thread lubricant could meet the level of some commercial products,while its some properties such as thermal stability,anti-wear and anti-friction properties were better.The said anti-seize thread lubricant is more suitable for use under high temperature conditions.

DHEA对小鼠超排卵和卵母细胞质量的影响

目的研究脱氢表雄酮(DHEA)对C57BL/6J雌鼠超排卵效果和卵母细胞质量的影响及其机制。方法3周龄C57BL/6J雌鼠30只随机分为3组,分别为对照组、低剂量处理组(2 mg/kg·d^-1)和高剂量处理组(5 mg/kg·d^-1)。用DHEA灌胃1周,再经超排卵后分别进行体外受精和收集卵丘细胞。提取卵丘细胞RNA进行qRT-PCR检测与胚胎质量相关基因Grem1、Has2、Ptgs1、Ptgs2和Vcan的mRNA水平以及凋亡相关基因Caspase3和Bcl2l10的mRNA水平。结果经过DHEA处理的雌鼠超排卵后,体外受精(IVF)显示实验组异型卵比例下降。实验组卵丘细胞中与胚胎质量相关基因Has2,Ptsg1和Vcan转录水平与对照组相比上调,而Germ1和Ptgs2的mRNA水平下调。Caspase3的mRNA水平下调,Bcl2l10的mRNA水平上调。结论经过DHEA处理后可以通过抑制卵丘细胞凋亡,提高卵母细胞的质量。