Enhanced biological nutrient removal in modified carbon source division anaerobic anoxic oxic process with return activated sludge pre-concentration

A pilot-scale modified carbon source division anaerobic anoxic oxic(AAO) process with pre-concentration of returned activated sludge(RAS) was proposed in this study for the enhanced biological nutrient removal(BNR) of municipal wastewater with limited carbon source. The influent carbon source was fed in step while a novel RAS pre-concentration tank was adopted to improve BNR efficiency, and the effects of an influent carbon source distribution ratio and a RAS pre-concentration ratio were investigated. The results show that the removal efficiency of TN is mainly influenced by the carbon source distribution ratio while the TP removal relies on the RAS pre-concentration ratio. The optimum carbon source distribution ratio and RAS pre-concentration ratio are 60% and 50%, respectively, with an inner recycling ratio of 100% under the optimum steady operation of pilot test, reaching an average effluent TN concentration of 9.8 mg·L-1with a removal efficiency of 63% and an average TP removal efficiency of 94%. The mechanism of nutrient removal is discussed and the kinetics is analyzed. The results reveal that the optimal carbon source distribution ratio provides sufficient denitrifying carbon source to each anoxic phase, reducing nitrate accumulation while the RAS pre-concentration ratio improves the condition of anaerobic zone to ensure the phosphorus release due to less nitrate in the returned sludge. Therefore, nitrifying bacteria, denitrifying bacteria and phosphorus accumulation organisms play an important role under the optimum condition, enhancing the performance of nutrient removal in this test.

Sorption of Heavy Metal and Organic Pollutants on Modified Soils

Sorption characteristics of both an organic pollutant (phenol) and a heavy metal (cadmium ion) on the clay layer of a Lou soil (Eum-orthic Anthrosol in Chinese Soil Taxonomy) along with the sorption mechanism were investigated using three soil treatments: modification with a cationic surfactant cetyltrimethylammonium bromide added at an amount equivalent to 50% and 100% of the soil CEC (50%CB and 100%CB), modification with an amphoteric surface-modifying agent dodecyldimethylbetaine (commercially known as BS-12) added at an amount equivalent to 50% and 100% of the soil CEC (50% BS and 100%BS), and an unmodified control (CK). Results showed that the BS soil treatments increased sorption of both the heavy metal Cd2+ and the organic pollutant phenol. The equilibrium sorption amount of Cd2+ decreased in the order: 50%BS > 100%BS > CK > 50%CB > 100%CB, with the BS soil treatments being about 1.3 to 1.8 times higher and the CB soil treatments about 23% to 41% lower than CK. Both the single-site and two-site Langmuir models could be applied to describe the sorption of Cd2+ in each soil treatment. The equilibrium sorption amount of phenol on the soil samples decreased in the order: 100%CB > 50%CB > 100%BS > 50%BS > CK, with the CB soil treatments being 41.0 to 79.6 times higher and the BS soil treatments 4.0 to 8.3 times higher than CK. The Freundlich equation could also be used to describe the sorption characteristics of phenol. In the BS soil treatments, both an organophobic long carbon chain and hydrophilic charged groups resulted in a relatively strong sorption ability for both heavy metals and organic pollutants. In addition, the sorption ratio K, the ratio of phenol sorption amount of the modified soil to that of CK, increased initially and decreased later with the amount of phenol added, and the critical sorption ratio KC, the peak value of the sorption ratio curve plotted against the added phenol concentration, was a good index for evaluating the sorption ability of phenol in the soil.

Comparative evaluation of modified neem leaf, neem leaf and woodash extracts on soil fertility improvement, growth and yields of maize (<i>Zea mays</i>L.) and watermelon (<i>Citrullus lanatus</i>) (Sole and Intercrop)

Two field experiments were carried out at Akure (7oN, 5o101E) in the rainforest zone of Nigeria in 2006 and 2007 to determine the effectiveness of neem leaf, woodash and modified neem leaf extracts as fertilizer sources in improving soil fertility, growth and yield of maize (Zea mays L) and watermelon (Citrulus lanatus) sole and intercrop. There were six treatments namely, poultry manure, neem leaf extract (sole), woodash extract, modified neem leaf (neem leaf + woodash), NPK 15-15-15 and a control (no fertilizer nor extract), replicated three times and arranged in a randomized complete block design (RCB). The extracts (neem leaf, wood ash and modified neem leaf) were applied at 1200 litres per hectare each, NPK 15-15-15 at 300 kg/ha and poultry was applied at 6t/ha. The results showed that there were significant increases (P 2O), K, Ca, Mg, Na, O.M, P and N compared to NPK 15-15-15 and neem leaf extract. For instance, modified neem leaf extract increased soil pH (H2O), K, Ca, Mg, Na, O.M, P and N by 12.4%, 32.8%, 25%, 23.7%, 19.32%, 17.24% and 20% respectively compared to neem leaf extract under intercrop plot. The high soil K/Ca, K/Mg and P/Mg ratios in the NPK 15-15-15 fertilizer treatment led to an imbalance in the supply of P, K, Ca and Mg nutrients to maize and watermelon crops. The least values for growth, yield and soil parameters were recorded under the control treatment. In these experiments, modified neem leaf extract (woodash + neem leaf extracts) applied at 1200 litres/ha was the most effective in improving soil fertility, growth and yield of maize and watermelon (sole and intercrop) and could substitute for 6 tons per hectare of poultry manure and 300kg/ha of NPK 15-15-15 fertilizer.

Synthesis of a Macromer, MPEGAA, Used to Prepare an AMPS-modified Polyacrylic Acid Superplasticizer

A macromer, methoxypolyethylene glycol acrylate （MPEGAA）, was synthesized by direct esterification using methoxypolyethylene glycol （MPEG-1200） and acrylic acid （AA） as the main materials. MPEGAA was then used to prepare a polyacrylic acid superplasticizer modified with 2-acrylamido-2- methylpropane sulfonic acid （AMPS）. A single-factor test was performed to investigate the effects of the molar ratio of acid to alcohol （n（AA）/n（MPEG））, inhibitor amount, catalyst amount, temperature, and time of esterification on the synthesis of MPEGAA. The experimental results showed that the optimal esterification conditions were as follows： n（AA）/n（MPEG）, 3.5：1; amount of hydroquinone （as an inhibitor）, 1.2%; amount of para-toluenesulfonic acid （as a catalyst）, 5.5%; reaction temperature, 95 ~C; and reaction time, 6 h. The AMPS- modified polyacrylic acid superplasticizer prepared under the optimal esterification conditions enabled the achievement and maintenance of high cement dispersibility. At an admixture amount of 0.15%, the cement paste fluidity was initially as high as 300 mm, and then decreased to 315 mm after 1 h and to 290 mm after 2 h.

Changepoint Analysis by Modified Empirical Likelihood Method in Two-phase Linear Regression Models

A changepoint in statistical applications refers to an observational time point at which the structure pattern changes during a somewhat long-term experimentation process. In many cases, the change point time and cause are documented and it is reasonably straightforward to statistically adjust (homogenize) the series for the effects of the changepoint. Sadly many changepoint times are undocumented and the changepoint times themselves are the main purpose of study. In this article, the changepoint analysis in two-phrase linear regression models is developed and discussed. Following Liu and Qian (2010)'s idea in the segmented linear regression models, the modified empirical likelihood ratio statistic is proposed to test if there exists a changepoint during the long-term experiment and observation. The modified empirical likelihood ratio statistic is computation-friendly and its ρ-value can be easily approximated based on the large sample properties. The procedure is applied to the Old Faithful geyser eruption data in October 1980.

基于改进Ratio和区域MRF的SAR图像分割方法

针对SAR图像中存在强烈乘性相干斑噪声,在没有滤波前提下,提出了基于改进的均值比率(Modified ROA,MROA)和区域马尔科夫随机场(MRF)相结合的SAR图像分割方法。针对SAR图像实际,要求边缘检测算子能克服乘性相干斑噪声并且准确定位边缘,采用MROA直接检测SAR图像梯度,然后与分水岭变换相结合进行初始分割,在初始分割的基础上,结合区域邻接图和MRF方法,即使用区域水平的MRF实现区域合并。用提出的方法对合成图像和SAR图像分别进行分割实验,结果表明该方法有效、准确性好。

Development and experimental validation of a one-dimensional dynamic hygrothermal modeling based on air humidity ratio

A modified one-dimensional transient hygrothermal model for multilayer wall was proposed using air humidity ratio and temperature as the driving potentials.The solution for the governing equations was obtained numerically by implementing the finite-difference scheme.To evaluate the accuracy of the model,a test system was built up to measure relative humidity and temperature within a porous wall and compare with the prediction of the model.The prediction results have good agreement with the experimental results.For the interface close to indoor side,the maximum deviation of temperature between calculated and test data is 1.87 K,and the average deviation is 0.95 K;the maximum deviation of relative humidity is 11.4%,and the average deviation is 5.7%.For the interface close to outdoor side,the maximum deviation of temperature between prediction and measurement is 1.78 K,and the average deviation is 1.1 K;the maximum deviation of relative humidity is 9.9%,and the average deviation is 4.2%.

Computation of compressible flows with high density ratio and pressure ratio

The WENO method, RKDG method, RKDG method with original ghost fluid method, and RKDG method with modified ghost fluid method are applied to singlemedium and two-medium air-air, air-liquid compressible flows with high density and pressure ratios： We also provide a numerical comparison and analysis for the above methods. Numerical results show that, compared with the other methods, the RKDG method with modified ghost fluid method can obtain high resolution results and the correct position of the shock, and the computed solutions are converged to the physical solutions as themesh is refined.

Revisit the Two Sample t-Test with a Known Ratio of Variances

Inference for the difference of two independent normal means has been widely studied in staitstical literature. In this paper, we consider the case that the variances are unknown but with a known relationship between them. This situation arises frequently in practice, for example, when two instruments report averaged responses of the same object based on a different number of replicates, the ratio of the variances of the response is then known, and is the ratio of the number of replicates going into each response. A likelihood based method is proposed. Simulation results show that the proposed method is very accurate even when the sample sizes are small. Moreover, the proposed method can be extended to the case that the ratio of the variances is unknown.

NLR与MSI对急性NSTEMI短期预后判断价值

目的本研究旨在探讨校正休克指数(MSI)和中性粒细胞/淋巴细胞比值(NLR)在判断急性非ST段抬高型心肌梗死(NSTEMI)患者短期内可能出现不良预后的预测能力。方法研究组选择2020年3月到2021年9月期间,首次就诊急诊科明确诊断为急性非ST段抬高型心肌梗死的276例患者。通过快速急诊绿道监测血压与心率,并于急诊科10 min内抽取血常规、床旁心脏彩超等相关化验检查,依据监测及化验结果,研究小组计算了校正休克指数(MSI)和中性粒细胞/淋巴细胞比值(NLR),然后根据统计结果将患者分为2组:NLR≥5.0组(n=75)与NLR﹤5.0组(n=201);(2)MSI≥1.2组(n=57)与MSI<1.2组(n=219)。比较2组一般资料情况,发生不良心血管事件的比例,采用受试者ROC曲线下面积来评估NLR值和MSI值对NSTEMI院内不良心血管事件的预测能力。结果连续入选的276例NSTEMI患者中,发生不良心血管事件52例,占18.8%,心源性休克患者15例,占5.4%,恶性心律失常患者24例,占8.7%,死亡13例,占4.7%。NLR≥5.0与MSI≥1.2值组的心功能、收缩压(SBP)、舒张压(DBP)及心率(HR)分别与NLR<5.0与MSI<1.2组比较,差异有统计学意义(P<0.05);NLR≥5.0与MSI≥1.2组MACE发生率分别高于NLR<5.0组与MSI<1.2组(P<0.05)。此外,NLR和MSI的ROC曲线下面积分别为0.734和0.703,提示NLR和MSI均具有评价急性非ST段抬高型心肌梗死患者短期不良心血管事件发生能力。结论MSI与NLR是评估NSTEMI短期不良预后的两个简单的重要的易获得指标。

摩尔比对MMOS水泥力学性能和变形行为的影响及机理

研究了原材料摩尔比(n(MgO)∶n(MgSO_(4))∶n(H_(2)O))对改性硫氧镁(MMOS)水泥力学性能和变形行为的影响,并采用X射线衍射仪(XRD)、扫描电镜(SEM)、傅里叶变换红外光谱(FTIR)及热重分析(TG)等测试技术对其机理进行分析.结果表明:MMOS水泥的抗压强度和抗折强度随着水硫比和氧硫比的提高均呈提升趋势.其中原材料摩尔比为10∶1∶12时,水泥力学性能最优.不同摩尔比MMOS水泥在56d龄期内均呈膨胀变形,其中总变形随水硫比和氧硫比的提高呈减小趋势;自收缩变形随水硫比的提高而减小,随氧硫比的提高呈先增后减趋势.这主要是由于硬化后不同摩尔比MMOS水泥中的水化产物Mg(OH)_(2)和5·1·7相(5Mg(OH)_(2)·MgSO_(4)·7H_(2)O)含量各有不同.当Mg(OH)_(2)含量减少,而5·1·7相含量增加时,MMOS水泥的膨胀变形量降低,同时其抗折强度和抗压强度有所提升.

基于改性逆向热致相分离法聚砜微孔膜的制备与性能

针对逆向热致相分离法(RTIPS)制备聚砜(PSF)微孔膜成膜体系稳定性较差的问题,首先对亲水性的端羟基型超支化聚酯(HBPE)进行封端,然后以PSF为膜材料,通过添加亲水剂封端HBPE构建四元低临界共溶温度(LCST)成膜体系PSF/HBPE/N,N-二甲基乙酰胺/聚乙二醇400,采用改性逆向热致相分离法(m-RTIPS)一步制备了亲水性PSF微孔膜。对封端HBPE进行了结构分析和分子量测试,分析了HBPE的封端率对四元成膜体系浊点和黏度的影响,研究了HBPE的封端率对PSF微孔膜的形貌、渗透性、亲水性、抗污染性和力学性能的影响。结果表明,成功对HBPE进行了封端,封端后HBPE的分子量增加;成膜体系的浊点和黏度随HBPE封端率的升高而增大,但黏度上升的幅度较小;3种添加不同封端率HBPE的PSF微孔膜的纯水通量、截留率、亲水性和力学性能都优于纯PSF微孔膜;随HBPE封端率的增加,膜的纯水通量下降,但截留率差别很小。当HBPE封端率为30%时,PSF膜纯水通量恢复率达88%,抗污染性最佳。添加不同封端率HBPE都可制得表面多孔的膜,当HBPE封端率为50%时,PSF膜具有全双连续结构的形貌,其拉伸强度、拉伸弹性模量和断裂伸长率分别为4.86,143.92 MPa和22.68%,综合力学性能优异。

非酒精性脂肪性肝病患者C/RL-r、APRI、FIB-4水平与肝纤维化发生的相关性

目的分析非酒精性脂肪性肝病(NAFLD)患者改良肝尾状叶/右叶比值(C/RL-r)、天门冬氨酸氨基转移酶与血小板比值指数(APRI)、基于4因子的纤维化指数(FIB-4)与肝纤维化发生的相关性。方法选择2021年2月至2022年12月在保定市第一中心医院治疗的NAFLD患者153例,根据病理学结果,将患者分为无肝纤维化组81例、肝纤维化组72例。行MRI扫描检测C/RL-r;计算APRI、FIB-4水平;分析NAFLD患者实验室指标、C/RL-r、APRI、FIB-4水平与发生肝纤维化的相关性,发生肝纤维化的独立危险因素及C/RL-r、APRI、FIB-4对NAFLD患者发生肝纤维化的预测价值。结果肝纤维化组ALT、AST、TBil、GGT、TG、C/RL-r、APRI、FIB-4水平显著高于无肝纤维化组,分别为(42.32±10.21)U/L比(36.21±7.78)U/L、(45.36±8.72)U/L比(27.45±5.40)U/L、(13.52±3.65)μmol/L比(12.24±2.16)μmol/L、(60.53±13.41)U/L比(53.69±12.44)U/L、(1.99±0.53)mmol/L比(1.05±0.33)mmol/L、(1.15±0.12)比(0.92±0.09)、(0.52±0.15)比(0.32±0.10)、(1.47±0.47)比(0.94±0.30),高密度脂蛋白胆固醇(HDL-C)水平显著低于无肝纤维化组为(1.03±0.26)mmol/L比(1.32±0.45)mmol/L,(t=4.189、15.453、2.674、3.272、13.322、13.501、4.302、8.405、4.801,均P<0.05);NAFLD患者ALT、AST、TG、C/RL-r、APRI、FIB-4与发生肝纤维化呈正相关(r=0.531、0.435、0.571、0.605、0.771、0.716,均P<0.001);ALT、AST、TG、C/RL-r、APRI、FIB-4水平高是影响NAFLD患者发生肝纤维化的独立危险因素(P<0.05);C/RL-r、APRI、FIB-4、三者联合预测NAFLD患者发生肝纤维化的曲线下面积(AUC)分别为0.767、0.830、0.754、0.936;相较于C/RL-r、APRI、FIB-4单独预测的AUC,三者联合预测的AUC更高(Z=4.495、3.999、4.677,均P<0.001)。结论发生肝纤维化的NAFLD患者C/RL-r、APRI、FIB-4水平较高,三者联合检测对NAFLD患者发生肝纤维化具有较高预测价值。

沥青胶结磷石膏对其性能影响及微观分析

这是一篇陶瓷及复合材料领域的论文。为探索磷石膏在道路材料应用新途径,采用磷石膏粉与沥青胶浆搅拌混合,制备磷石膏改性沥青混料。研究搅拌温度、粉胶比及多聚磷酸掺入量对磷石膏改性沥青三大指标的影响。研究结果表明:搅拌温度的增加,软化点也随之提升,延度先升高随后不再提升,考虑能效及老化温度,沥青的加工温度应在135~145℃之间;增大粉胶比可以提升改性沥青的软化点,同时会使沥青的延度下降,故以磷石膏为改性剂改性沥青时粉胶比不应大于0.9;多聚磷酸掺入改性沥青对软化点有较大的提升,但会使其延度和针入度下降,多聚磷酸较佳掺入量应为1.5%;红外光谱(FTIR)和热重分析(TG-DSC)表明,磷石膏与沥青仅为物理胶结,多聚磷酸掺入沥青时会与沥青发生化学反应。研究结果可为磷石膏在道路材料的工程应用和理论研究提供参考。

配置抗冲切钢筋的RC板柱节点受冲切承载力计算

为计算配有常用抗冲切钢筋(箍筋和栓钉)的钢筋混凝土(RC)板柱节点的受冲切承载力,结合梁斜拉破坏机理和修正压力场理论(MCFT)提出一种配有抗冲切钢筋的RC板柱节点的受冲切承载计算方法.首先根据MCFT推导出配有抗冲切钢筋的RC板柱节点的临界斜裂缝倾角计算式;然后,假定冲切破坏时临界截面周长范围内的抗冲切钢筋达到屈服强度,将临界斜裂缝倾角代入MCFT推导出板柱节点的受冲切承载力计算方法;最后,使用该方法和美国规范(ACI 318-19)方法计算62个配有抗冲切钢筋的RC板柱节点试验的冲切承载力,并分析了混凝土强度、板有效厚度、柱截面边长、抗弯钢筋配筋率及抗冲切钢筋配筋率对节点抗冲切承载力的影响.结果表明:由MCFT推导出的节点受冲切承载力计算值与试验值吻合较好,均值为0.96,变异系数为0.20;节点的冲切承载力与上述影响因素呈非线性正相关.该方法可用于配有抗冲切钢筋的RC板柱节点的受冲切承载力计算.

SBS改性沥青再生废旧聚氨酯混凝土的配制及旧料掺量的影响评价

聚氨酯混凝土是一种新型铺装材料,研究废旧聚氨酯混凝土的再生利用对该材料的推广应用意义重大。首先,通过聚氨酯混凝土室内模拟老化制备了RPC;其次,选用0%、25%、30%、35%、40%、45%和50%7种RPC掺配比例配制了AC-13型SBS改性沥青再生废旧聚氨酯混凝土;再次,对不同RPC掺量下的SBS改性沥青再生RPC进行了路用性能评价;最后,对SBS沥青-石灰岩、SBS沥青-老化聚氨酯和老化聚氨酯-石灰岩3种界面的黏附性能进行了测试,对比分析了RPC对路用性能影响的成因。结果表明,除50%RPC掺量的SBS改性沥青再生RPC外,其余6种RPC掺量的均满足相关技术要求,且随RPC掺量的增加,其高温性能减弱而低温性能和水稳定性增强;SBS沥青-老化聚氨酯和老化聚氨酯-石灰岩的界面黏附性能优于SBS沥青-石灰岩。

改性膨润土对污水中重金属离子吸附实验研究

这是一篇陶瓷及复合材料领域的论文。为了研究改性膨润土对污水中重金属离子的吸附效果,分析pH值、初始浓度、时间、固液比、温度和粒径对膨润土吸附效果的影响,并采用微观手段研究在吸附重金属离子前后膨润土内部矿物成分的变化以及红外光谱图的变化规律。结果表明:当改性膨润土掺量为0.2 g、吸附时间为1.5 h、温度设置为40℃,pH值设定为6,初始浓度均设定为200 mg/L和固液比设置为0.8 g/L时,改性膨润土的吸附效果达到较佳。改性膨润土经过吸附实验后,可以检测到明显的CuSO_(4)衍射峰,但是改性膨润土内部其他矿物成分不变,这说明改性膨润土可以有效地吸附污水中的铜离子。

采用改良跟骨锁定板治疗Sanders分型Ⅲ~Ⅳ型跟骨骨折的疗效观察

目的探讨改良跟骨锁定板治疗Sanders分型Ⅲ~Ⅳ型跟骨骨折的疗效。方法回顾性分析山西医科大学第二医院骨科2021年1月至2022年8月期间采用改良跟骨锁定板(改良组)和普通跟骨锁定板(传统组)治疗跟骨骨折Sanders分型Ⅲ~Ⅳ型患者资料,共72例(77足)。记录并比较两组患者的手术时间、术中透视次数、术中出血量、皮瓣愈合情况、住院时间、早期下地负重时间、骨折愈合时间、术后并发症发生情况,术前、术后即刻、术后1年时Bohler角、Gissane角、术后1年足功能(Maryland)评分、美国矫形外科足踝协会踝-后足评分(AOFAS)、足功能指数量表(FFI)、疼痛视觉模拟评分(VAS)。结果改良组手术平均时长、术后早期下地负重时间均短于传统组(P<0.05)。术中出血量、透视次数、平均住院时间、骨折愈合时间均无明显差异。改良组与传统组术后1年相关角度相比差异有统计学意义(P<0.05),表明在负重后,改良组关节面并未有明显塌陷。术后1年随访,改良组优良率、AOFAS评分、FFI指数均优于传统组,VAS评分较传统组更低(P<0.05)。结论改良跟骨锁定板治疗Sanders分型Ⅲ~Ⅳ型的跟骨骨折,可以实现良好的临床和放射学结果,且无严重并发症,有利于患者后足功能的恢复,优良率更高,有一定的临床推广价值。

Recovery of iron from copper slag via modified roasting in CO-CO2 mixed gas and magnetic separation

A novel technology,modified roasting in CO-CO2 mixed gas and magnetic separation,was presented to recover iron from copper slag.The effects of various parameters such as dosage of flux(CaO),gas flowrate of CO and CO2,roasting temperature,roasting time,particle size of modified slag and magnetic flux density on the oxidized modification and magnetic separation were investigated by comparison of the X-ray diffraction patterns and iron recovery ratio.The optimum conditions for recovering iron by oxidizing roasting and magnetic separation are as follows:calcium oxide content of 25 wt.%,mixed gas flow rates of CO2 and CO of 180 and 20 mL/min,oxidizing roasting at 1323 K for 2 h,grinding the modified slag to 38.5-25.0μm and magnetic separation at 170 mT.The mineralogical and microstructural characteristics of modified slag revealed that the iron-bearing minerals in the copper slag were oxidized,the generated magnetite grew into large particles,and the silicate in copper slag was combined with calcium oxide to form calcium silicate.Finally,the iron-bearing concentrate with an iron grade of 54.79%and iron recovery ratio of 80.14%was effectively obtained.

NLR在急性缺血性脑卒中患者早期神经功能损伤、预后及复发风险评估中的价值

目的探讨中性粒细胞/淋巴细胞比值(NLR)在急性缺血性脑卒中(AIS)患者早期神经功能损伤、预后及复发风险评估中的价值。方法选取2022年4月至2023年10月宁波市医疗中心李惠利医院收治的经临床和影像学检查证实为AIS的患者236例为研究对象,根据TOAST分型标准分为大动脉粥样硬化型151例、心源性栓塞型30例、小动脉闭塞型55例。比较不同TOAST分型AIS患者性别、年龄、高血压史、糖尿病史、吸烟史、饮酒史、入院时美国国立卫生研究院卒中量表(NIHSS)、改良Rankin量表(mRS)、Essen卒中风险评分量表(ESRS)评分、中性粒细胞绝对值(N)、NLR、红细胞分布宽度(RDW)、超敏C反应蛋白(hs-CRP)、D-二聚体、同型半胱氨酸(Hcy)、IL-6、IL-10的差异。根据入院时NIHSS、mRS、ESRS评分结果,采用单因素及多因素二元logistic回归分析影响AIS患者神经功能损伤程度、预后状况及复发风险的因素。ROC曲线评估实验室指标判断AIS患者神经功能损伤程度、预后状况及复发风险的效能。采用Spearman秩相关分析AIS患者NLR与NIHSS评分、mRS评分、ESRS评分的相关性。结果不同TOAST分型AIS患者年龄、NIHSS评分、mRS评分、ESRS评分、N、NLR、RDW、hs-CRP、D-二聚体、Hcy、IL-6、IL-10水平比较,差异均有统计学意义(均P<0.05)。多因素分析显示,NLR是AIS患者神经功能损伤程度的独立影响因素(P<0.05)。NLR、hs-CRP、D-二聚体是AIS患者神经功能预后状况的独立影响因素(均P<0.05)。NLR、D-二聚体是AIS患者复发风险的独立影响因素(均P<0.05)。NLR判断AIS患者神经功能损伤程度的最佳截断值为2.52,灵敏度为0.734,特异度为0.528,AUC为0.670。NLR联合hs-CRP、D-二聚体判断AIS患者神经功能预后状况的最佳截断值为0.40,灵敏度为0.718,特异度为0.730,AUC为0.781。NLR联合D-二聚体判断AIS患者复发风险的最佳截断值为0.42,灵敏度为0.736,特异度为0.661,AUC为0.736。Spearman秩相关分析显示,NLR与NIHSS评分、mRS评分、ESRS评分均呈正相关(rs=0.291、0.358、0.277,均P<0.001)。结论NLR在AIS患者早期神经功能损伤、预后及复发风险评估中具有一定临床价值,NLR联合hs-CRP、D-二聚体等指标可有效提高AIS患者神经功能预后评估的效能。