Development of calcium coke for CaC2 production using calcium carbide slag and coking coal

A type of calcium coke was developed for use in the oxy-thermal process of calcium carbide production.The calcium coke was prepared by the co-pyrolysis of coking coal and calcium carbide slag, which is a solid waste generated from the chlor-alkali industry.The characteristics of the calcium cokes under different conditions were analyzed experimentally and theoretically.The results show that the thermal strength of calcium coke increased with the increase in the coking coal proportion, and the waterproof property of calcium coke also increased with increased carbonation time.The calcium coke can increase the contact area of calcium and carbon in the calcium carbide production process.Furthermore, the pore structure of the calcium coke can enhance the diffusion of gas inside the furnace, thus improving the efficiency of the oxy-thermal technology.

Calcium Carbonate Lab Scale Continuous Carbon Dioxide-jet Controlled Production Following Fuzzy Logic Model

In this paper, lab scale production carried out of calcium carbonate in 400 mL open cylindrical beaker reactor following fuzzy logic approach is reported. 10 grams of Calcium hydroxide is mixed in 250 mL deionized water. Continuous jet supply of carbon dioxide is maintained at controlled flow rate. Reaction histories are noted for different reaction temperatures. Continuous constant magnetic stirring is applied to maintain homogeneity. The data obtained is fuzzified by constructing universe of discourse of temperature, reaction time, and amounts of reactants with reaction conversion. Rule based model is tabulated and results show that fuzzy logic approach is promising to set on data to plan and scale up the process. It is also found that a jump can not be made at this time with few studies of fuzzy logic applications to physiochemical processes unless otherwise amassing and storing up plentiful deduced explorations.

Hydration Products of Cement-silica Fume-quartz Powder Mixture under Different Curing Regimes

Composition, morphology, and structure of hydration products in hardened pastes of three kinds of blended cement（cement-silica fume, cement-quartz powder and cement-silica fume-quartz powder） hydrated under different curing regimes（standard curing, 90 ℃ steam curing, 200 ℃ and 250 ℃ autoclave curing） were investigated by X-ray diffraction and field emission scanning electron microscope equipped with EDAX system. Results showed that the main hydration products in three kinds of hardened pastes under standard curing condition are all C-S-H gels, CH, and AFt. Under 90 ℃ steam curing condition, the main hydration products of cement-silica fume and cement-silica fume-quartz powder are C-S-H gels, whereas those of cement-quartz powder are C-S-H and CH. Under 200 or 250 ℃ autoclave curing condition, no obvious crystallized CH phase is found in hardened pastes of three kinds of blended cement, and C-S-H gels are transformed into one or more crystalline phases such as tobermorite, jennite, and xonotlite. The chemical composition and morphology of these crystalline phases depend on the composition of mixture and autoclave temperature.

NiO-CaO materials as promising catalysts for hydrogen production through carbon dioxide capture and subsequent dry methane reforming

In this work, CaO-NiO mixed oxide powders were evaluated as consecutive CO;chemisorbents and catalytic materials for hydrogen production thought the CH;reforming process. Between the NiO impregnated CaO and CaO-NiO mechanical composite, the first one presented better chemical behaviors during the CO;capture and CH;reforming processes, obtaining syngas（H;+ CO） as final product. Results showed that syngas was produced at two different temperature ranges, between 400 and 600 °C and at T > 800 °C, where the first temperature range corresponds to the CH;reforming process but the second temperature range was attributed to a different catalytic reaction process: CH;partial oxidation. These results were confirmed through different isothermal and cyclic experiments as well as by XRD analysis of the final catalytic products, where the nickel reduction was evidenced. Moreover, when a CO-O;flow was used during the carbonation process a triple process was achieved:（i） CO oxidation,（ii） CO;chemisorption and（iii） CH;reforming. Using this gas flow the hydrogen production was always higher than that obtained with CO;.

Food Sources and Intake of Calcium in a Representative Sample of Spanish Adults

The present study aimed to assess calcium intake, dietary sources of this nutrient and its adequacy with respect to the dietary reference intake (DRI) in a representative sample of Spanish adults. In this study 418 adults (18 to 60 years) from 15 Spanish provinces were studied. Energy and nutrient intake was determined using a 24-hour recall questionnaire for two days. Adequacy of calcium intake was assessed using the established DRI for calcium. Anthropometric data (weight and height) were measured and the body mass index was calculated. Seventy eight percent of the participants in the study did not meet the DRI for calcium. Additionally, 33.7% of the participants did not meet the 67% of the DRI. The daily intake of calcium was 916.6 ± 288.1 mg/day, which represented the 81.3% of the DRI of calcium. Interestingly, subjects who had higher intake of calcium were taller. Additionally, it has been observed that individuals with normal body weight (BMI 2) had higher intakes of dairy products in comparison with overweight and obese individuals (BMI ≥ 25 kg/m2). The main food sources of calcium were dairy products (58.7% of calcium), cereals (13.6%) and vegetables (6.5%). Less than 1% (0.5%) of the calcium intake came from dietary supplements. It was observed that individuals who met the DRI for calcium had a significantly higher intake of dairy products (551.3 ± 240.4 g/day) than individuals who did not meet the DRI of calcium (305.0 ± 150.3 g/day). Calcium intake was inadequate in this sample of the adult Spanish population. Therefore, an increase in the consumption of dairy products, as well as cereals, vegetables and food items fortified with calcium seems to be necessary to achieve an adequate intake of calcium and to prevent diseases caused by calcium deficiency.

Dairy Product Consumption in French Children in 2010

Dairy food consumption is important for children as it contributes to the intake of key nutrients, especially calcium. The aim of the present paper is to provide an overview of dairy products consumption for French children, according to age, sex and type of dairy products. Adequacy of dairy and calcium intakes in line with French national guidelines “3 portions of dairy products per day” were also evaluated. Data were extracted and analyzed from the CCAF—Comportementet Consommations Alimentairesen France-study. Seven-day questionnaires were administered to free-living individuals from autumn 2009 to summer 2010. Subjects were children (n = 1171) aged 3 - 17 years. Dairy products contributed substantially to the intake of calcium, phosphorus, potassium, zinc, vitamin B2 and vitamin B12. A general decrease in DP consumption has been observed since 2003. This is most notably due to a lower milk intake which is not compensated by increased cheese or fresh dairy products. Most of children (67%), and up to 73% of adolescents (15 - 17 y), did not reach the recommended “3 servings of dairy products per day”. Twenty percent of children from the age of 6 and nearly 2/3 of female adolescents did not reach their estimated average requirement for calcium. The overview of French dairy food consumption during childhood, of particular Public Health concern, emphasizes the need to encourage dairy consumption and particularly milk consumption at breakfast in order to maintain a nutrient adequacy in children and adolescents.

A new size and shape controlling method for producing calcium alginate beads with immobilized proteins

A method for producing size- and shape-con-trolled calcium alginate beads with immobilized proteins was developed. Unlike previous cal-cium alginate bead production methods, pro-tein-immobilized alginate beads with uniform shape and sizes less then 20 micrometers in diameter could successfully be produced by using sonic vibration. BSA and FITC-conjugated anti-BSA antibodies were used to confirm pro-tein immobilization in the alginate beads. Pro-tein diffusion from the beads could be reduced to less than 10% by cross-linking the proteins to the alginate with 1-ethyl-3-(3-dimethylamino-propyl)carbodiimide (EDC) and N-hydroxysul-fosuccinimide (NHSS). The calcium alginate beads could also be arranged freely on a slide glass by using a femtosecond laser.

1,6-二磷酸果糖钙对海兰褐蛋鸡生产性能、蛋品质、血清生化指标和免疫指标的影响

试验旨在研究1,6-二磷酸果糖钙对海兰褐蛋鸡生产性能、蛋品质、血清生化指标和免疫指标的影响。试验选择800只健康、产蛋率相近的380日龄海兰褐蛋鸡,随机分成4组,每组20个重复,每个重复10笼,每笼1只鸡。对照组、低剂量组、中剂量组和高剂量组分别在基础日粮中添加0mg/kg、100mg/kg、200mg/kg和300mg/kg1,6-二磷酸果糖钙,进行为期9周的试验。结果显示:与对照组相比,中、高剂量组产蛋率显著提高(P<0.05),且与1,6-二磷酸果糖钙的添加量呈二次曲线关系(P<0.05);低、中和高剂量组破蛋率显著降低(P<0.05)。中、高剂量组蛋黄颜色和蛋壳强度显著提高(P<0.05),蛋壳强度与1,6-二磷酸果糖钙添加量呈二次曲线关系(P=0.024);低、中和高剂量组的蛋壳比例显著提高(P<0.05),且随1,6-二磷酸果糖钙添加量的增加呈线性升高(P=0.034)。低、中和高剂量组谷丙转氨酶活性显著降低(P<0.05);低、中剂量组总胆固醇含量显著降低(P<0.05),且总胆固醇含量与1,6-二磷酸果糖钙添加量呈二次曲线关系(P=0.004);中、高剂量组高密度脂蛋白含量显著提高(P<0.05);中剂量组低密度脂蛋白含量显著降低(P<0.05),且低密度脂蛋白含量与1,6-二磷酸果糖钙添加量呈二次曲线关系(P=0.036)。低、中和高剂量组的IgM和IgA含量均显著增加(P<0.05),其中IgA含量随1,6-二磷酸果糖钙添加量的增加呈线性升高(P=0.047)。分别对产蛋率、蛋壳强度、总胆固醇含量和低密度脂蛋白含量进行二次曲线方程拟合表明,当1,6-二磷酸果糖钙添加量分别为179、186、243和268mg/kg时,产蛋率、蛋壳强度、总胆固醇含量和低密度脂蛋白含量分别达到最佳。研究提示:日粮中添加200和300mg/kg1,6-二磷酸果糖钙较佳,基于产蛋率、蛋壳强度、总胆固醇含量和低密度脂蛋白含量考虑,适宜的1,6-二磷酸果糖钙添加量分别为179、186、243和268mg/kg。

Hydration of concrete containing calcium-enriched fly ash at subzero temperature

The compressive strength,hydration products and microstructure of concrete with calcium-enriched fly ash(CEFA) at different temperature were investigated.The result indicates that the hydration products age of 7 d at-15 ℃ are mainly ettringite and C-S-H,and fly ash particles remain original state.Standard curing was adapted after 7 d curing at-15 ℃.At the age of 35 d,C-S-H was found on the surface of fly ash particles.The hydration product of CEFA is mainly C-S-H gel,which can densify the microstructure of concrete.

血清S100钙结合蛋白A12、可溶性晚期糖基化终末产物受体水平与维持性血液透析患者骨质疏松的相关性分析

目的探讨维持性血液透析(MHD)患者血清S100钙结合蛋白A12(S100A12)、可溶性晚期糖基化终末产物受体(sRAGE)的水平变化及与骨质疏松的关系。方法选取2020年1月~2022年6月在本院血透室治疗的MHD患者110例,根据T值将其分为骨质疏松组(42例,T值≤-2.5 g/cm2)及非骨质疏松组(68例,T值>-2.5 g/cm2),同期选取在本院健康体检者50例为对照组。收集所有受试者的一般资料(性别、年龄、BMI、透析龄)及临床资料并进行组间比较。相关性分析采用Pearson相关分析。采用受试者工作特征(ROC)曲线评估血清sRAGE和S100A12水平对MHD患者骨质疏松的预测价值。采用多重线性回归分析探讨MHD患者发生骨质疏松的影响因素。结果与对照组相比,非骨质疏松组与骨质疏松组患者血钙、血磷、骨密度、sRAGE水平均降低,全段甲状旁腺激素(iPTH)、尿素氮(BUN)、血肌酐(SCr)、白蛋白(Alb)、S100A12水平均升高(P<0.05)。与非骨质疏松组相比,骨质疏松组患者血清iPTH、S100A12水平均升高,血磷、骨密度、sRAGE水平均降低(P<0.05)。Pearson相关分析结果显示,MHD患者血清sRAGE与S100A12表达呈负相关;血清sRAGE与血磷、骨密度均呈正相关,与iPTH呈负相关;血清S100A12与血磷、骨密度均呈负相关,与iPTH呈正相关(P<0.05)。ROC曲线分析结果显示,血清S100A12、sRAGE联合预测MHD患者骨质疏松的ROC曲线下面积(AUC)、特异度均高于二者单独预测。多重线性回归分析结果显示,MHD患者S100A12、sRAGE、iPTH均与骨质疏松发生有关(P<0.05)。结论MHD患者骨质疏松发生与sRAGE、S100A12密切相关,联合检测二者可作为诊断MHD患者骨质疏松发生的指标。

钙源厨余垃圾制备羟基磷灰石的可行性研究

目的为了提高钙源厨余垃圾利用率,改善水热合成法制备羟基磷灰石的工艺条件,更好的满足在水体和土壤污染中的修复应用。方法以典型的钙源厨余垃圾鸡蛋壳作为制备材料,采用水热合成法制备羟基磷灰石。通过正交实验筛选羟基磷灰石制备最佳工艺,并利用X-射线衍射(XRD)、傅里叶变换红外光谱(FTIR)、扫描电镜(SEM)、及比表面积检测(BET)对其结构和合成产率进行表征分析,并探讨了羟基磷灰石制备主要影响因素钙磷摩尔比和陈化时间对合成产率的影响。结果鸡蛋壳制备羟基磷灰石的最佳工艺条件为pH值9.5,振荡时间3h,振荡温度70℃,煅烧时间1h;XRD与FTIR分析明确了制备得到的产物为羟基磷灰石,SEM表明羟基磷灰石微观形貌主要为棒状和片状,BET表明羟基磷灰石的比表面积、孔容和孔径分别为12.4m^(2)/g、0.18cm^(3)/g和58.12nm;通过调整钙磷摩尔比可以提升羟基磷灰石的合成产率至70.4%,延长陈化时间可以改善羟基磷灰石表面的晶体形貌和团聚现象。结论鸡蛋壳作为典型的钙源厨余垃圾,可以实现低成本地制备羟基磷灰石,应用到环境污染修复中。

骨折患者初期血清钙磷浓度变化与骨折部位的相关性分析

目的探究骨折患者初期血钙、血磷、钙磷乘积水平变化并分析其与骨折部位的相关性。方法选取2021年1月~2023年11月四川省骨科医院收治的骨折患者1049例作为研究对象,按骨折部位粗分为两组:上半身部位骨折(n=478)和下半身部位骨折(n=571);细分十组:椎体骨折(n=108)、锁骨骨折(n=109)、上肢骨折(n=106)、手部骨折(n=104)、股骨颈骨折(n=103)、股骨粗隆间骨折(n=106)、髌骨骨折(n=101)、下肢骨折(n=103)、足部骨折(n=105)和其他骨折(n=104)。另选取同期健康体检人群110例作为对照组。全部患者于急诊当日和入院后24~48h两次抽取静脉血测定血钙、血磷,并计算钙磷乘积,比较三者水平变化并分析其与骨折部位的相关性。结果与对照组比较,骨折患者急诊当日和入院后24~48h,血钙(2.27±0.12 mmol/L,2.19±0.12 mmol/L vs2.35±0.10mmol/L)、血磷(1.00±0.20mmol/L,1.08±0.19mmol/L vs 1.15±0.15mmol/L)、钙磷乘积(28.10±6.00mg/dl,29.30±5.85mg/dl vs 33.41±4.87mg/dl)均降低,差异具有统计学意义(t=6.804,12.501;7.475,3.722;8.964,7.115,均P<0.01)。上、下半身骨折相比,急诊当日血钙、血磷和钙磷乘积下半身骨折低于上半身骨折(t=4.129,5.931,6.660,均P<0.01);入院后24~48h则仅钙、钙磷乘积下半身骨折低于上半身骨折(t=6.432,1.990,均P<0.05),差异具有统计学意义。沿时间轴比较,入院后24~48h与急诊当日相比,上、下半身骨折均表现出血钙降低而血磷升高(t=12.779,-5.730;16.919,-14.358),钙磷乘积则仅下半身骨折较急诊当日升高(t=-8.860),差异具有统计学意义(均P<0.01)。不同部位骨折患者入院后24~48h与急诊当日相比,除椎体骨折外,其余九组血钙均降低(t=6.233~11.349);除上肢骨折、手部骨折外,其余八组血磷升高(t=-7.770~-3.327);椎体骨折、股骨颈骨折、股骨粗隆间骨折、下肢骨折、足部骨折、其他骨折钙磷乘积升高(t=-5.819~-2.927),差异具有统计学意义(均P<0.01)。结论骨折患者急诊当日血钙、血磷和钙磷乘积均降低,24~48h后多数患者血钙持续降低,血磷和钙磷乘积逐渐回升,其水平变化程度与骨折部位有关。

沸石增强砂土微生物固化效果研究

为提高砂土的微生物固化效果,考虑沸石作为吸附材料具有多孔的特性,通过宏观物理力学试验和微细观检测,系统分析了沸石对微生物固化砂土的增强效果。研究结果表明:沸石能够显著提高砂土微生物加固过程中的固菌率。与常规微生物固化相比,掺入沸石后,固菌率提升约5.5倍,抗压强度提升39.35%,渗透系数减小71.94%。掺入沸石,一方面能够增加碳酸钙沉淀生成量,并改善其分布均匀性;另一方面,沸石周围的碳酸钙沉淀对两侧砂颗粒起到良好的桥接作用,能够增强砂颗粒之间的结构性及试样的整体性。研究成果为进一步优化微生物诱导碳酸钙沉积技术提供参考。

血清钙磷乘积对老年骨质疏松性椎体骨折的预测价值探讨

目的 分析血清钙磷乘积对老年骨质疏松性椎体压缩骨折(OVCF)的预测价值。方法 回顾性分析2018年7月至2022年6月收治的因老年OVCF行椎体成形术患者100例为观察组,选取同期同数量年龄、性别相匹配的因脊柱退变性疾病行手术治疗的患者为对照组,比较两组入院时的一般资料及实验室指标,通过Logistic回归分析老年OVCF发生的相关影响因素,绘制ROC曲线,比较其评估老年患者OVCF风险发生的效能,并与亚洲人骨质疏松症自我评估工具(OSTA)进行对比分析,进一步探讨血清钙磷乘积对老年OVCF的预测价值。结果 观察组白蛋白、血清钙、磷、钙磷乘积、校正血钙、校正钙磷乘积、OSTA指数均低于对照组(P<0.05)。Logistic回归分析表明,血清钙、磷、钙磷乘积、校正血钙、校正钙磷乘积及OSTA指数升高是老年OVCF的保护因素。ROC曲线结果显示,血清钙磷乘积、校正钙磷乘积及OSTA对老年OVCF诊断的AUC值分别为0.810、0.772、0.659,且血清钙磷乘积及校正钙磷乘积预测老年OVCF的效能优于OSTA指数。结论 血清钙磷乘积及校正钙磷乘积对老年OVCF的发生具有预测价值。

饲粮添加甲酸钙对老龄蛋鸡生产性能和鸡蛋品质的影响

[目的]甲酸钙作为小分子质量的有机钙源,在改善蛋鸡生产方面具有很好的应用潜力。本研究旨在揭示饲粮添加甲酸钙对老龄蛋鸡生产性能、血液指标和鸡蛋品质的影响及适宜添加水平。[方法]试验采用单因子试验设计,选取360只62周龄健康海兰褐蛋鸡,随机分入4个处理组,每处理6个重复,每重复15只鸡。对照组饲喂基础饲粮,试验组分别饲喂以0.5%、1.0%和2.0%甲酸钙部分替代石粉的基础饲粮,各组饲粮的钙水平相同。正式期12周,每天记录产蛋情况,每周结料。在试验第2、4、6和8周测定鸡蛋品质相关指标;试验结束时,每重复取1只蛋鸡,采集血样,测定血常规和血清生化指标,然后屠宰测定脏器系数和胫骨质量。[结果]与对照组相比,饲粮添加甲酸钙对蛋鸡生产性能、第2和4周蛋品质无影响(P>0.05),但增加了第8和12周的蛋壳比、蛋壳厚度和蛋壳强度(P<0.05),其中0.5%添加水平效果最佳;降低了蛋鸡血液中中性粒细胞含量(P<0.05),增加了血红蛋白含量、红细胞压积及单核白细胞、嗜碱性粒细胞含量(P<0.05);降低了蛋鸡血清总蛋白、球蛋白、白蛋白和肌酐含量(P<0.05),增加了总胆红素含量(P<0.05);蛋鸡胰腺、脾脏、腿肌和胫骨指数均无显著差异(P>0.05),但胫骨断裂所需做功有增加的趋势(0.05<P<0.1)。[结论]饲粮添加甲酸钙部分替代石粉不影响老龄蛋鸡生产性能,且能改善蛋鸡的健康和蛋壳品质,推荐添加量为0.5%。

磷酸盐改性铝酸盐水泥的研究与应用进展

磷酸盐改性铝酸盐水泥(CAPC)是一类新型胶凝材料,其特征反应为铝酸盐水泥与可溶性磷酸盐发生化学反应生成具有胶结性的难溶性磷酸盐.本文系统性总结了自CAPC理念提出30年来关于CAPC原材料、凝结硬化机理、新拌浆体流动性、硬化浆体组成与孔结构、力学性能与耐久性的重要研究进展;介绍CAPC作为耐火材料、腐蚀防护层和放射性废物固化材料的应用前景;最后提出CAPC研究和应用过程中所面临的问题以及未来研发方向.

钙果复合果浆的功能成分及其减肥降脂作用

目的:枸杞、沙棘和钙果是我国北方特有的食药同源食物,为了深层次开发3种果实的营养成分,以钙果原浆(纯度100%)、沙棘原浆(纯度100%)、枸杞原浆(纯度100%)3种原料,按照体积比2∶1.5∶1调配混合,制成一款酸甜可口的钙果复合果浆,探究其功能成分及减肥作用。方法:采用电感耦合等离子体质谱法测定复合果浆的微量元素,采用高相液相色谱法测定维生素和类胡萝卜素,液相色谱-质谱联用法测定多酚类化合物和有机酸类化合物。建立肥胖小鼠模型,探究复合果浆对肥胖小鼠的减肥作用。结果表明,复合果浆富含多种功能成分,其中,钙含量为(73.671±4.918)μg/L,维生素B_(2)含量为(503.333±2.054)ng/mg,芦丁含量为(8.345±0.091)μg/mL。与模型组相比,剂量组经复合果浆干预后,小鼠体质量明显下降,甘油三酯含量显著降低(P<0.05)。结论:复合果浆对肥胖小鼠具有显著改善作用,本研究为钙果复合果浆的营养保健作用提供了数据支撑,并为预防肥胖提供了一种新的营养干预方法。

结肠癌病人血清S100钙结合蛋白A12、可溶性晚期糖基化终产物受体水平与肠道菌群失调及化疗效果的关系

目的探讨结肠癌病人血清S100钙结合蛋白A12(S100A12)、可溶性晚期糖基化终产物受体(sRAGE)水平与肠道菌群失调及化疗效果的相关性。方法选择2020年12月至2021年12月黄河水利委员会黄河中心医院收治的116例中、晚期结肠癌病人作为结肠癌组,另选取在该院同期健康体检人员120例作为对照组。采用酶联免疫吸附测定(ELISA)检测血清S100A12、sRAGE水平,检测病人肠道菌群,并对病人化疗后进行随访,Pearson法分析结肠癌病人血清S100A12、sRAGE水平与菌群失调相关性,受试者操作特征曲线(ROC曲线)分析化疗前血清S100A12、sRAGE水平对结肠癌化疗效果的诊断价值。结果与对照组比较,结肠癌组病人化疗前血清S100A12、sRAGE水平显著升高(P<0.05)。与化疗前菌群正常组[(265.34±45.78)μg/L、(381.54±36.75)ng/L]比较,菌群失调Ⅰ度组[(301.52±56.95)μg/L、(440.63±48.71)ng/L]、菌群失调Ⅱ度组[(339.29±52.35)μg/L、(432.75±49.20)ng/L]病人血清S100A12、sRAGE水平显著升高(P<0.05);与菌群失调Ⅰ度组比较,菌群失调Ⅱ度组病人血清S100A12、sRAGE水平显著升高(P<0.05)。相关性分析显示,结肠癌病人血清S100A12、sRAGE水平与大肠杆菌、粪肠球菌数量呈正相关(P<0.05),与双歧杆菌、乳酸杆菌数量呈负相关(P<0.05)。与化疗前比较,结肠癌病人化疗后血清S100A12、sRAGE水平显著降低(P<0.05);与化疗缓解组[(272.33±55.36)μg/L、(403.24±40.54)ng/L]比较,化疗无效组[(330.09±42.64)μg/L、(482.85±43.61)ng/L]病人化疗前血清S100A12、sRAGE水平显著较高(P<0.05)。血清S100A12、sRAGE联合诊断结肠癌化疗无效的曲线下面积(AUC)为0.91[95%CI:(0.84,0.96),P<0.001],灵敏度为86.05%,特异度为80.82%。结论结肠癌病人血清S100A12、sRAGE升高,与肠道菌群失调及化疗效果有关,对化疗疗效评估与预后评价有一定指导意义。

电石炉电极电流智能切换控制系统

当原料、炉况和加料过程发生未知变化时,电石炉电极控制系统的特性发生变化,导致PI控制系统难以满足电石炉的控制目标。将电石炉的动态特性与模糊自适应PI控制、规则切换控制相结合,提出了电石炉电极控制系统智能切换控制方法。设计了可编程逻辑控制器(programmable logic controller,PLC)系统软硬件平台,开发了基于所提控制方法的应用软件并研发了电石炉电极电流控制系统,成功应用于神木电化发展有限公司电石分厂。长期运行结果表明,采用所研制的电石炉电极电流控制系统,实现了生产过程的安全稳定运行,可以将电石炉电极电流控制在工艺规定的目标值范围内,提高了产品质量,降低了生产能耗,提高了企业的经济效益。

硫基复合肥副产盐酸制无水氯化钙生产工艺研究

氯化钙用途广泛,用量逐年增加,市场前景广阔。介绍了国内外氯化钙的市场、产能情况、产品价格走势,介绍了碱法氯化钙工艺、酸法氯化钙工艺技术以及精制氯化钙工艺,并对氯化钙产品的未来发展进行讨论。