ONECUT2高表达介导胃癌复发患者5-FU化疗耐药

目的:探究One cut结构域家族成员2(ONECUT2)是否可以作为对5-FU耐药的胃癌复发患者的治疗靶点。方法:利用癌症基因组图谱(TCGA)数据库分析ONECUT2基因在胃癌患者及胃癌复发患者的表达情况。利用基因集富集分析(GSEA)评估TCGA数据库中ONECUT2表达量与药物代谢相关生物学过程的相关性。利用CCK-8细胞毒性实验评估胃癌细胞敲低或过表达ONECUT2对5-FU的耐药情况。分析30例胃癌术后复发患者ONECUT2表达量与5-FU治疗效果的相关性。结果:TCGA数据库分析显示,在经受过化疗且复发的胃癌患者中,ONECUT2高表达的患者无病间隔期(disease-free interval,DFI)更短。GSEA分析结果表明,ONECUT2高表达与异生药物代谢通路呈正相关,这提示可能与胃癌患者的耐药相关。体外实验中,敲低ONECUT2降低胃癌细胞对5-FU的半数抑制浓度(IC_(50))值;反之,过表达ONECUT2增加细胞对5-FU的IC_(50)值。30例胃癌复发患者对5-FU的药物敏感性与ONECUT2表达量相关。结论:胃癌复发患者的ONECUT2表达量更高,ONECUT2高表达与胃癌复发患者的5-FU耐药相关,可能是潜在的治疗靶点。

Sysmex UF5000尿沉渣分析仪建立RBC WBC CAST阳性cut off值及准确性评估

目的建立Sysmex UF5000尿沉渣分析仪检测尿液标本相关参数红细胞(RBC)、白细胞(WBC)、管型(CAST)的阳性cut off值,并评价其性能。方法选取1059例尿液标本在Sysmex UF5000尿沉渣分析仪上进行检测,并离心镜检。以镜检结果作为金标准,ROC曲线分析RBC、WBC、CAST的阳性cut off值,并计算其敏感性、特异性、符合率、假阳性率和假阴性率等。进一步分析假阳性标本的影响因素和部分假阴性标本。结果阳性cut off值:RBC>16/μL(男)或>15/μL(女);WBC>17/μL(男)或>30/μL(女);CAST>0.49/μL。相关的敏感性、特异性、符合率均较高。假阳性标本影响因素中RBC男性主要是结晶,女性以结晶、细菌为主;WBC女性以鳞状上皮细胞为主,男性未见明显的影响因素;CAST均以黏液丝和鳞状上皮细胞为主。假阴性率低于5%,其中仅有9例为肾脏、泌尿系统疾病标本,占比0.85%。结论本实验室设置的UF5000尿沉渣分析仪RBC、WBC、BACT阳性cut off值,相关的敏感性、特异性、假阴性率和符合率均符合ISO15189认可和实验室的日常工作需求。

血清过敏原特异性IgE酶联免疫吸附法检测CUT OFF值的建立

目的通过对酶联免疫吸附法检测血清中过敏原特异性IgE的干扰因素分析和判读方式优化,建立该实验室的CUT OFF值。方法采用酶联免疫吸附法过敏原特异性IgE检测试剂盒,对861例患者血清中过敏原特异性IgE进行定性检测;采用专用扫描分析软件判读结果并结合人工辅助判读,依据统计学方法建立该实验室的CUT OFF值。根据不同的判读方式结合试剂说明书提供的CUT OFF值,分别计算不同CUT OFF值条件下的假阴性率和假阳性率;比较两者之间有无差异。结果分析软件判读结果显示,蛋清、屋尘螨、屋尘和柏树的血清过敏原特异性IgE判读的CUT OFF值为0.29 IU/mL,各组之间差异无统计学意义(P>0.05)。鳕鱼、虾、牛肉、芒果、花生、苦艾和猫毛血清过敏原特异性IgE判读的CUT OFF值为0.21 IU/mL,各组之间差异无统计学意义(P>0.05)。牛奶和点青霉血清过敏原特异性IgE判读的CUT OFF值为0.25 IU/mL,各组之间差异无统计学意义(P>0.05)。结合人工辅助判读结果显示,屋尘螨、屋尘、苦艾和点青霉血清过敏原特异性IgE判读的CUT OFF值为0.27 IU/mL,各组之间差异无统计学意义(P>0.05)。鳕鱼、虾、牛肉、芒果、花生和猫毛血清过敏原特异性IgE判读的CUT OFF值为0.21 IU/mL,各组差异无统计学意义(P>0.05)。牛奶和蛋清血清过敏原特异性IgE判读的CUT OFF值为0.19 IU/mL,差异无统计学意义(P>0.05)。柏树血清过敏原特异性IgE抗体判读的CUT OFF值为0.33 IU/mL。结论各实验室应建立各自的血清过敏原特异性IgE CUT OFF值。采用人工辅助判读方式可以排除干扰因素,降低假阳性率和假阴性率,为临床提供准确可靠的结果。

Cut Off质控图的意义及应用的探讨

提高检测准确度和灵敏度，一直是检验的追求，也一直是困扰检验的难题，它一方面依赖工作人员素质的提高；一方面依赖检测方法、技术和设备的进步。如何将阴阳性（或反应性）更准确地区分出来，很大程度上取决于检测方法与技术的进步，其中科学的CutOff是不可忽视的：当前ELISA比较科学实用的CutOff产生原理有2种：1．测定阴阳性标本，在NCutOff和PCutOff的基础上根据灰区的大小，结合假阴阳性确定CutOff；2．加测转化型血清，将能区别转化型样本的OD作为CutOff。

Research on the cutting thermodynamic behavior of high-strength large-thickness offshore jack-up platform leg rack

The cutting of offshore jack-up platform leg rack is highly nonlinear and complex thermal processing process. The residual stress influences the following welding quality and cause crack growth. Therefore, research on the cutting practice of jack-up platform leg rack is significant to improve the safety and reliability of the offshore platform. A heating source model that is applicable to the cutting and emulation of high-strength thick plates han been presented. Then, the thermo-physical characteristic parameters of NV E690 leg plate was calculated by JMATPRO, and is revised according to the theory of metallographic. Furthermore, the numerical simulation of the linear cutting of leg plate was conducted, and the reliability of the heating source model and the thermo-physical characteristic parameters of material were proved by comparing them with the experimental data. Bused on the former study, the optimal parameter （ heating source, cutting speed and radius of the heating source model） which ensured that the gear plate was cut through without edge collapses during cutting was calculated. The optimized process parameters can be used to study the distribution of residual stress in gear plate during cutting which provides theoretical guideline for improving the construction technology of offshore platform legs.

应用ROC曲线分析确定乙肝表面抗原Cut-off值

目的:利用ROC(受试者工作特征)曲线验证和重新确定乙肝表面抗原诊断实验Cut-off值。方法:回顾性分析本院8、9月份乙肝表面抗原检测原始数据,以不同的Cut-off值分组数据,根据真阳性率(TPF)和假阳性率(FPF)绘制ROC曲线图。结果:本科现用的英科新创乙肝表面抗原试剂其Cut-off值以0.108最佳,假阳性和假阴性比例最为合适,其敏感度达98.2%,特异性97.5%。结论:应用ROC曲线对临床实验室相关指标进行分析,可以比较科学地得出其临床诊断的敏感性和特异性,进而找出最理想的切点即Cut-off值,亦可对不同的试剂进行相应参数的比较。

Instability mechanism of mining roadway passing through fault at different angles in kilometre-deep mine and control measures of roof cutting and NPR cables

The angle α between the fault strike and the axial direction of the roadway produces different damage characteristics. In this paper, the research methodology includes theoretical analyses, numerical simulations and field experiments in the context of the Daqiang coal mine located in Shenyang, China. The stability control countermeasure of "pre-splitting cutting roof + NPR anchor cable"(PSCR-NPR) is simultaneously proposed. According to the different deformation characteristics of the roadway, the faults are innovatively classified into three types, with α of type I being 0°-30°, α of type II being 30°-60°, and α of type III being 60°-90°. The full-cycle stress evolution paths during mining roadway traverses across different types of faults are investigated by numerical simulation. Different pinch angles α lead to high stress concentration areas at different locations in the surrounding rock. The non-uniform stress field formed in the shallow surrounding rock is an important reason for the instability of the roadway. The pre-cracked cut top shifted the high stress region to the deep rock mass and formed a low stress region in the shallow rock mass. The high prestressing NPR anchor cable transforms the non-uniform stress field of the shallow surrounding rock into a uniform stress field. PSCR-NPR is applied in the fault-through roadway of Daqiang mine. The low stress area of the surrounding rock was enlarged by 3-7 times, and the cumulative convergence was reduced by 45%-50%. It provides a reference for the stability control of the deep fault-through mining roadway.

Minimum Amount of Slop Cut in Batch Distillation

The pulse-control operation technique which alternates between total reflux operation and total efflux operation in batch distillation was studied along with the minimum amount of slop cut. Total reflux time was confirmed by dynamic simulation, and total efflux time was adopted by statistic method. For the mixture of hexane and cyclohexane and the traditional constant reflux ratio operation strategy, the amount of slop cut is 1.8-2.1 times of the minimum amount of slop cut; whereas for the pulse-control operation strategy, it is 1. 2 -1.4 times of the minimum amount of slop cut. So compared with the traditional constant reflux ratio operation, the pulse-control operation can decrease the amount of slop cut and operation time, and meanwhile, enhance separation efficiency and yield.

Verification of the Cut-off Value of the Reticulocyte Hemoglobin Content to Diagnose Iron Deficiency

Iron deficiency anemia(IDA)is a common nutrient deficiency,and it has become a global public health problem identified by the World Health Organization.Studies have shown that IDA remains prevalent in both developing and developed countries,such as Australia and China,and that IDA may be associated with poorer cognitive and neurophysiologic maturation in early life and causes labor productivity losses,developmental delays,men tai and behavior disorders,and peri natal complicati ons in pregna nt and preme nopausal women[1].

OPTIMIZATION OF CUT-OFF GRADE IN OPEN-PIT BASED ON CONTROL THEORY

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A Self-consistent Calculation and an Anisotropic Wavelength Cut off Energy of Spin-wave Spectrumin Magnetic Tunnel Junctions

Temperature dependence of tunnel magnetoresistance (TMR) ratio, resistance, and coercivity from 4.2 K to room temperature (RT), applied de bias voltage dependence of the TMR ratio and resistances at 4.2 K and RT, tunnel current I and dynamic conductance dI/dV as functions of the de bias voltage at 4.2 K, and inelastic electron tunneling (IET) spectroscopy, d(2)I/dV(2) versus V, at 4.2 K for a tunnel junction of Ta(5 nm)/Ni79Fe21(25 nm)/Ir22Mn78(12 nm)/Co75Fe25(4 nm)/Al(0.8 nm)-oxide/Co75Fe25(4 nm)/Ni79Fe21(25 nm)/Ta(5 nm) were systematically investigated. High TMR ratio of 59.2% at 4.2 K and 41.3% at RT were observed for this junction after annealing at 275 degreesC for an hour. The temperature dependence of TMR ratio and resistances from 4.2 to 300 K at 1.0 mV bias and the de bias voltage dependence of TMR ratio at 4.2 K from 0 to 80 mV can be evaluated by a comparison of self-consistent calculations with the experimental data based on the magnon-assisted inelastic excitation model and theory. An anisotropic wavelength cutoff energy of spin-wave spectrum in magnetic tunnel junctions (MTJs) was suggested, which is necessary for self-consistent calculations, based on a series of IET spectra observed in the MTJs.

The Offline Program Profile Lining and Cutting Robot System

The paper introduces a new type of cutting system: the Offline Program Profile Lining and Cutting Robot System (OPPLCRS). The system adopts the offline program technology without teaching. The system can measure and compensate every profile’s deformation automatically, so it is suit to process any batch of profiles, and the order of processing different profiles can be arranged at will. The OPPLCRS, firstly appearing in China, will have wide application in profile cutting fields.

Squeezing Effects on the Estimation Precision of Cut off Frequency

We study the behavior of quantum Fisher information for a qubit probe that is interacting with a squeezed thermal environment. We analyzed the effect of squeezing parameters on the dynamics of quantum Fisher information which affects the optimal precision of the estimation parameter. We show that the squeezed field may offer a significant role in the precise measurement of the parameter cut-off frequency which is linked to the environment correlation time. Our results may be useful in quantum metrology, communication, and quantum estimation processes.

Hole cleaning evaluation and installation spacing optimization of cuttings bed remover in extended-reach drilling

In extended-reach or long-horizontal drilling,cuttings usually deposit at the bottom of the annulus.Once cuttings accumulate to a certain thickness,complex problems such as excessive torque and drag,tubing buckling,and pipe stuck probably occur,which results in a lot of non-productive time and remedial operations.Cuttings bed remover can efficiently destroy deposited cuttings in time through hydraulic and mechanical stirring effects.This paper aims to build a method for hole cleaning evaluation and installation spacing optimization of cuttings bed remover to improve the wellbore cleaning effect.Firstly,a Computational Fluid Dynamics approach with Eulerian—Eulerian multiphase model was utilized to investigate the mechanism of cuttings transportation,and a new type of cuttings bed remover was designed.Next,an evaluation method of hole cleaning effect of remover was established.After that,the effects of several drilling parameters on hole cleaning including flow rate of drilling fluid,rotational speed of drillpipe,rate of penetration,wellbore size,rheological property of drilling fluid,and remover eccentricity on the performance of cuttings bed remover were investigated.The results demonstrate that the new type of remover with streamline blade performs better than conventional removers.The efficiency of hole cleaning is greatly improved by increasing the rotational speed of drillpipe,flow rate of drilling fluid,remover eccentricity,and 6 rpm Fann dial reading for drilling fluid.While higher rate of penetration and large wellbore size result in worse hole cleaning.These findings can serve as an important guide for the structure optimization design of cuttings bed remover and installation spacing of removers.

Unraveling engineering disturbance effects on deformation in red-bed mudstone railway cuttings:incorporating crack-facilitated moisture diffusion

Red-bed mudstone, prevalent in southwest China, poses a formidable challenge due to its hydrophilic clay minerals, resulting in expansion, deformation, and cracking upon exposure to moisture. This study addresses uplift deformation disasters in high-speed railways by employing a moisture diffusion-deformation-fracture coupling model based on the finite-discrete element method(FDEM). The model integrates the influence of cracks on moisture diffusion. The investigation into various excavation depths reveals a direct correlation between depth and the formation of tensile cracks at the bottom of the railway cutting. These cracks expedite moisture migration, significantly impacting the temporal and spatial evolution of the moisture field. Additionally, crack expansion dominates hygroscopic deformation, with the lateral coordinate of the crack zone determining peak vertical displacement. Furthermore, key factors influencing deformation in railway cuttings, including the swelling factor and initial moisture content at the bottom of the cutting, are explored. The number of tensile and shear cracks increases with greater excavation depth, particularly concerning shear cracks. Higher swelling factors and initial moisture contents result in an increased total number of cracks, predominantly shear cracks. Numerical calculations provide valuable insights, offering a scientific foundation and directional guidance for the precise prevention, control, prediction, and comprehensive treatment of mudstone-related issues in high-speed railways.

Assessing cutter-rock interaction during TBM tunnelling in granite:Large-scale standing rotary cutting tests and 3D DEM simulations

The widespread utilisation of tunnel boring machines(TBMs)in underground construction engineering requires a detailed investigation of the cutter-rock interaction.In this paper,we conduct a series of largescale standing rotary cutting tests on granite in conjunction with high-fidelity numerical simulations based on a particle-type discrete element method(DEM)to explore the effects of key cutting parameters on the TBM cutter performance and the distribution of cutter-rock contact stresses.The assessment results of cutter performance obtained from the cutting tests and numerical simulations reveal similar dependencies on the key cutting parameters.More specifically,the normal and rolling forces exhibit a positive correlation with penetration but are slightly influenced by the cutting radius.In contrast,the side force decreases as the cutting radius increases.Additionally,the side force shows a positive relationship with the penetration for smaller cutting radii but tends to become negative as the cutting radius increases.The cutter's relative effectiveness in rock breaking is significantly impacted by the penetration but shows little dependency on the cutting radius.Consequently,an optimal penetration is identified,leading to a low boreability index and specific energy.A combined Hertz-Weibull function is developed to fit the cutter-rock contact stress distribution obtained in DEM simulations,whereby an improved CSM(Colorado School of Mines)model is proposed by replacing the original monotonic cutting force distribution with this combined Hertz-Weibull model.The proposed model outperforms the original CSM model as demonstrated by a comparison of the estimated cutting forces with those from the tests/simulations.The findings from this work that advance our understanding of TBM cutter performance have important implications for improving the efficiency and reliability of TBM tunnelling in granite.

Precipitates Generation Mechanism and Surface Quality Improvement for Aluminum Alloy 6061 in Diamond Cutting

To improve the surface quality for aluminum alloy 6061(Al6061) in ultra-precision machining, we investigated the factors affecting the surface finish in single point diamond turning(SPDT)by studying influence of the precipitates generation of Al6061 on surface integrity and surface roughness.Based on the Johnson-Mehl-Avrami solid phase transformation kinetics equation, theoretical and experimental studies were conducted to build the relationship between the aging condition and the type, size and number of the precipitates for Al6061. Diamond cutting experiments were conducted to machine Al6061 samples under different aging conditions. The experimental results show that, the protruding on the chip surface is mainly Mg_(2)Si and the scratches on the machined surface mostly come from the iron-containing phase(α-, β-AlFeSi).Moreover, the generated Mg_(2)Si and α-, β-AlFeSi affect the surface integrity and the diamond turned surface roughness. Especially, the achieved surface roughness in SPDT is consistent with the variation of the number of AlFeSi and Mg_(2)Si with the medium size(more than 1 μm and less than 2 μm) in Al6061.

Ground response and failure mechanism of gob-side entry by roof cutting with hard main roof

This study is the result of long-term efforts of the authors’team to assess ground response of gob-side entry by roof cutting(GSERC)with hard main roof,aiming at scientific control for GSERC deformation.A comprehensive field measurement program was conducted to determine entry deformation,roof fracture zone,and anchor bolt(cable)loading.The results indicate that GSERC deformation presents asymmetric characteristics.The maximum convergence near roof cutting side is 458 mm during the primary use process and 1120 mm during the secondary reuse process.The entry deformation is closely associated with the primary development stage,primary use stage,and secondary reuse stage.The key block movement of roof cutting structure,a complex stress environment,and a mismatch in the supporting design scheme are the failure mechanism of GSERC.A controlling ideology for mining states,including regional and stage divisions,was proposed.Both dynamic and permanent support schemes have been implemented in the field.Engineering practice results indicate that the new support scheme can efficiently ensure long-term entry safety and could be a reliable approach for other engineering practices.

Yield and Nutritive Values of Semi- and Non-Fall Dormant Alfalfa Cultivars under Late-Cutting Schedule in California’s Central Valley

California is one of the major alfalfa (Medicago sativa L) forage-producing states in the U.S, but its production area has decreased significantly in the last couple of decades. Selection of cultivars with high yield and nutritive value under late-cutting schedule strategy may help identify cultivars that growers can use to maximize yield while maintaining area for sustainable alfalfa production, but there is little information on this strategy. A field study was conducted to determine cumulative dry matter (DM) and nutritive values of 20 semi- and non-fall dormant (FD) ratings (FD 7 and FD 8 - 10, respectively) cultivars under 35-day cut in California’s Central Valley in 2020-2022. Seasonal cumulative DM yields ranged from 6.8 in 2020 to 37.0 Mg·ha−1 in 2021. Four FD 8 - 9 cultivars were the highest yielding with 3-yrs avg. DM greater than the lowest yielding lines by 46%. FD 7 cultivar “715RR” produced the highest crude protein (CP: 240 g·Kg−1) while FD 8 cultivar “HVX840RR” resulted in the highest neutral detergent fiber digestibility (NDFD: 484 g·Kg−1, 7% greater than the top yielding cultivars) but with DM yield intermediate. Yields and NDFD correlated positively but weakly indicating some semi- and non-FD cultivars performing similarly. These results suggest that selecting high yielding cultivars under 35-day cutting schedule strategy can be used as a tool to help growers to maximize yield while achieving good quality forages for sustainable alfalfa production in California’s Central Valley.