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Effects of Peracetic Acid(PAA) Combined with Calcium Treatments on Storage Quality of Loquat Fruit 被引量:4
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作者 宋虎卫 郑永华 +2 位作者 袁卫明 张瑞越 杨立明 《Agricultural Science & Technology》 CAS 2013年第10期1476-1481,共6页
[Objective] The paper was to evaluate effects of peracetic acid (PAA) combined with calcium treatments on storage quality of Ioquat fruits, so as to pro- vide practical techniques to solve the problems of postharves... [Objective] The paper was to evaluate effects of peracetic acid (PAA) combined with calcium treatments on storage quality of Ioquat fruits, so as to pro- vide practical techniques to solve the problems of postharvest rot and quality deteri- oration for Ioquat fruits. [Method] With Ioquat fruits of Qingzhong variety as materi- als, 0.2%, 0.4% and 0.8% PAA combined with 0.8% CaCI2 was used to soak Ioquat fruits for 4 min, 0.8% CaCl2 and water treatments were set as two controls; the fruits were dried and packaged by 0.02 mm PE bags, then stored under non-chilling low temperature of (7±1) ℃. The indicators related to storage quality of Ioquat fruits were randomly tested once every 3 d, and their variation situations were analyzed. [Result] Compared with two control treatments and 0.2% PAA, 0.8% PAA combined with calcium treatments, the treatment of 0.4% PAA combined with 0.8% CaCl2 could significantly inhibit rot index, weight loss rate, firmness and cell membrane permeability of Ioquat fruits during storage period, which could also effectively delay the reduction of titratable acid, vitamin C, soluble solid content and juice yield, and maintain respiration intensity of fruits at a low level; the appearance and flavor qual- ity of fruits were good after stored for 25 d. [Conclusion] 0.4% PAA combined with 0.8% CaCl2 treatment is an efficient, safe and economical practice technology in an- ti-corrosion and quality preservation for postharvest Ioquat fruits . 展开更多
关键词 Loquat (Eriobotrya japonica) Peracetic acid (PAA) calcium treatment Storage quality
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Inclusion variations and calcium treatment optimization in pipeline steel production 被引量:11
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作者 Jian-hua Liu Hua-jie Wu +1 位作者 Yan-ping Bao Min Wang 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2011年第5期527-534,共8页
SiCa line and SiCaBaFe alloy were injected into liquid pipeline steel at the end of LF refining as calcium treatment,and samples were taken from the ladles,mould,and slabs.Analysis of Ca content and inclusions shows t... SiCa line and SiCaBaFe alloy were injected into liquid pipeline steel at the end of LF refining as calcium treatment,and samples were taken from the ladles,mould,and slabs.Analysis of Ca content and inclusions shows that Ca content in steel decreases obviously in the following process after calcium treatment;the compositions,morphology,and sizes of inclusions also vary much in the production;primary inclusions in the ladles prior to calcium treatment are mainly Al2O3 inclusions,but they turn to fine irregular CaS-CaO-Al2O3 compound inclusions after the treatment,then become fine globular CaO-Al2O3 inclusions in the mould,and finally change to a few larger irregular CaS-CaO-Al2O3 complex inclusions in the slabs.Thermodynamic study reveals that inclusion variations are related with the preferential reactions among Ca,Al2O3,and S and the precipitation of S in CaO-Al2O3 inclusions with high sulfur capacity.New evaluation standards for calcium treatment in high-grade pipeline steel were put forward according to the inclusion variations and requirements of pipeline steel on inclusion controlling,and the calcium process was studied and optimized. 展开更多
关键词 pipeline steel refining inclusions calcium treatment THERMODYNAMICS precipitation
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Effects of calcium treatment on non-metallic inclusions and magnetic properties of non-oriented silicon steel sheets 被引量:7
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作者 ZHANG Feng MIAO Lede +3 位作者 ZONG Zhenyu WANG Bo ZHANG Yi MA Zhigang 《Baosteel Technical Research》 CAS 2013年第1期12-19,共8页
Based on the industrial production of non-oriented silicon steel,calcium treatment by CaSi wire feeding during the RH refining process was studied. The thermodynamics of CaS inclusion formation was analyzed, and the m... Based on the industrial production of non-oriented silicon steel,calcium treatment by CaSi wire feeding during the RH refining process was studied. The thermodynamics of CaS inclusion formation was analyzed, and the morphology and the size distribution were observed. Furthermore, the change in inclusion characteristics after calcium treatment and the effect of calcium treatment on magnetic properties were discussed. The results show that the formation of MnS and A1N inclusions were restrained, and the aggregating, floating and removing of microinclusions after calcium treatment were effectively promoted. The cleanliness of liquid steel was obviously increased. The main type of inclusions was single phase of CaO, with some complex inclusions composed of CaO, SiO2 and MgO. No CaS inclusion was observed after an appropriate calcium treatment. The size of all inclusions was distributed in the range of 2 - 20 μm, and the number was about 1.8 × 10^5/mm3. In addition, as an increasing amount of calcium was added,the core loss gradually decreased to a stable level, and the magnetic induction decreased quickly after a slow increase. The optimal calcium treatment mode depends on the chemical composition of steel. 展开更多
关键词 non-oriented silicon steel RH refining calcium treatment INCLUSION magnetic property
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Effect of Calcium Treatment During Production on Quality of Stored Huangguan Pear Fruit
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作者 Tiezheng LIU Xueying LI +5 位作者 yong LI Guosheng LIU Jingtao WANG Yongbo WANG Yali FU Yanxiao HAN 《Agricultural Biotechnology》 CAS 2019年第2期188-190,共3页
The effect of calcium treatment during production on the quality(soluble solids, fruit firmness, soluble sugar content, titratable acid content, etc.) of Huangguan pear was studied. The results showed that the calcium... The effect of calcium treatment during production on the quality(soluble solids, fruit firmness, soluble sugar content, titratable acid content, etc.) of Huangguan pear was studied. The results showed that the calcium treatment during production improved the comprehensive quality of Huangguan pear fruit, delayed and reduced the occurrence of browning of fruit core, and enhanced its storage effect in the cold storage. Therefore, the calcium treatment improved the quality of stored pear fruit. 展开更多
关键词 calcium treatment Huangguan PEAR STORAGE
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Denaturation behavior of inclusions in industrial pure iron by calcium treatment
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作者 Xin Liu Yan-ping Bao +3 位作者 Cheng-jian Hua Jian-hua Chu Chao Gu Min Wang 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2023年第2期249-258,共10页
Only a few Chinese enterprises can produce high-quality industrial pure iron,and studies on the smelting process of industrial pure iron were limited.The inclusions in a melting process were characterized by means of ... Only a few Chinese enterprises can produce high-quality industrial pure iron,and studies on the smelting process of industrial pure iron were limited.The inclusions in a melting process were characterized by means of electron microscopy and an automatic inclusion analysis system,and the evolution mechanism of inclusion was studied using thermodynamic calculation to optimize the calcium alloy addition in liquid window.The results show that during the smelting process,inclusions mainly composed of Al_(2)O_(3)and spinel are formed before calcium treatment.After calcium treatment,they continuously react with[Ca],[S]and[Ti],grow up,and are removed during refining and tundish pouring.In the end,there are more small-sized inclusions containing CaS,and the contents of Al_(2)O_(3)and spinel are less.According to thermodynamic calculations,the appropriate calcium treatment liquid window for the molten steel composition is(10-38)×10^(-6).Calcium treatment has changed the main types of inclusions in industrial pure iron from Al_(2)O_(3)to small-sized inclusions containing CaS and effectively reduces the influence of Al_(2)O_(3)inclusions on the quality of industrial pure iron. 展开更多
关键词 Industrial pure iron calcium treatment INCLUSION THERMODYNAMIC CAS
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Double-Blind, Parallel Group Study to Compare the Clinical Effectiveness of Calcium Dobesilate 500 mg BID vs. Calcium Dobesilate LP 1 g OD, in Patients with Chronic Venous Insufficiency of the Lower Limbs
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作者 Ramón Téllez Méndez Maria González Yibirin David Rincón Matute 《International Journal of Clinical Medicine》 CAS 2024年第5期211-223,共13页
Background: Chronic venous insufficiency (CVI) describes a condition that affects the venous system of the lower extremities due to venous hypertension (VH. The prevalence is between 5% - 30%. CVI is associated with o... Background: Chronic venous insufficiency (CVI) describes a condition that affects the venous system of the lower extremities due to venous hypertension (VH. The prevalence is between 5% - 30%. CVI is associated with older age, smoking, lower extremity trauma, presence of an arteriovenous shunt, and elevated estrogen levels. All patients should be initially treated with conservative management. Venoactive drugs like calcium dobesilate are useful. Objectives: The primary objective compared the clinical improvement in patients with CVI, grades 0 - 3 of the CEAP classification of chronic venous disease, produced by two formulations of calcium dobesilate: calcium dobesilate LP 1 g OD vs calcium dobesilate 500 mg BID, immediate release. The secondary objective assessed the side effects of both formulations. Method: All patients took one tablet and one capsule at 7 am, and one capsule at 7 pm, for 8 weeks. One group received dobesilate 1 g OD and the other group received dobesilate 500 md BID. They were evaluated after 15, 30 and 60 days of treatment, using the symptom evaluation scale. Results: In both groups, there was a significant decrease in the symptom score after 15 days. Four patients in the Dobesilate OD group: had adverse effects, which did not require suspension of treatment. In the BID dobesilate group, there was one therapeutic failure, and one case of gastric discomfort. Conclusions: Prolonged-release Calcium dobesilate 1 g OD is as effective as calcium dobesilate 500 mg BID for the treatment of patients with chronic venous insufficiency. 展开更多
关键词 Chronic Venous Insufficiency (CVI) calcium Dobesilate CEAP Classification Adverse Effects treatment Adherence
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Effect of Calcium Treatment on Non-Metallic Inclusions in Ultra-Low Oxygen Steel Refined by High Basicity High Al_2O_3 Slag 被引量:21
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作者 YANG Jun WANG Xin-hua JIANG Min WANG Wan-jun 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2011年第7期8-14,共7页
The influence of calcium treatment on non-metallic inclusions had been studied when control technology of refining top slag in ladle furnace was used in ultra-low oxygen steelmaking. A sufficient amount aluminium was ... The influence of calcium treatment on non-metallic inclusions had been studied when control technology of refining top slag in ladle furnace was used in ultra-low oxygen steelmaking. A sufficient amount aluminium was added to experimental heats for final deoxidizing during BOF tapping, and the refining top slag with strong reducibility, high basicity and high Al2O3 in ladle furnace was used to produce ultra-low oxygen steel and the transformation of nonmetallic inclusions in molten steel was compared by calcium treatment and no calcium treatment. The results show that the transformation of Al2O3--MgO - Al2O3 spinel-CaO-MgO-Al2O3 complex inclusions has been completed for aluminum deoxidation products and calcium treatment to molten steel is unnecessary when using the control technology of ladle furnace refining top slag to produce ultra-low oxygen steel, and the complex inclusions are liquid at the temperature of steelmaking and easily removable to obtain very high cleanliness steel by flotation. Further- more, the problems of nozzle clogging in casting operations do not happen and the remaining oxide inclusions in steel are the relatively lower melting point complex inclusions. 展开更多
关键词 ultra low oxygen top slag DEOXIDIZATION aluminium oxide inclusion calcium treatment
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Inclusion engineering and metallurgy of calcium treatment 被引量:7
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作者 Sunday Abraham Rick Bodnar +1 位作者 Justin Raines Yufeng Wang 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2018年第2期133-145,共13页
Although a great deal of research has been done in the area of inclusion control during steelmaking, a complete description of the process of inclusion modification and shape control cannot be found in literatures. As... Although a great deal of research has been done in the area of inclusion control during steelmaking, a complete description of the process of inclusion modification and shape control cannot be found in literatures. As a result, the terms "inclusion modification" and "shape control" are often used loosely in the technical community. To utilize the full potential offered by a calcium treatment, it is important to understand why an inclusion whose composition has been modified may not necessarily have its shape modified. With the purpose of decoupling the process of inclusion phase change from inclusion shape control, and to provide a complete description of the metallurgy of calcium treatment, a detailed literature survey has been performed on the subject. By coupling the survey with a new concept developed to tailor the cleanliness of steels to the intended applications, the hope is to provide the reader with valuable information on calcium treatment for inclusion modification and shape control. 展开更多
关键词 Nonmetallic inclusion CLEANLINESS calcium treatment Inclusion modification Inclusion shape control
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Vitamin D and calcium are required at the time of denosumab administration during osteoporosis treatment 被引量:11
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作者 Yukio Nakamura Takako Suzuki +4 位作者 Mikio Kamimura Kohei Murakami Shota Ikegami Shigeharu Uchiyama Hiroyuki Kato 《Bone Research》 SCIE CAS CSCD 2017年第4期384-390,共7页
To evaluate the differences in outcomes of treatment with denosumab alone or denosumab combined with vitamin D and calcium supplementation in patients with primary osteoporosis. Patients were split into a denosumab mo... To evaluate the differences in outcomes of treatment with denosumab alone or denosumab combined with vitamin D and calcium supplementation in patients with primary osteoporosis. Patients were split into a denosumab monotherapy group (18 cases) or a denosumab plus vitamin D supplementation group (combination group; 23 cases). We measured serum bone alkaline phosphatase (BAP), tartrate-resistant acid phosphatase (TRACP)-5b and urinary N-terminal telopeptide of type-I collagen (NTX) at baseline, 1 week, as well as at I month and 2, 4, 8 and 12 months. We also measured bone mineral density (BMD) of L1-4 lumbar vertebrae (L)-BMD and bilateral hips (H)-BMD at baseline and at 4, 8 and 12 months. There was no significant difference in patient background. TRACP-5b and urinary NTX were significantly suppressed in both groups from I week to 12 months (except at 12 months for NTX). In the combination group, TRACP-5b was significantly decreased compared with the denosumab monotherapy group at 2 and 4 months (P 〈 0.05). BAP was significantly suppressed in both groups at 2-12 months. L-BMD significantly increased at 8 and 12 months (8.9%) in the combination group and at 4, 8 and 12 months (6.0%) in the denosumab monotherapy group, compared with those before treatment. H-BMD was significantly increased in the combination group (3.6%) compared with the denosumab group (1.2%) at 12 months (P 〈 0.05). Compared with denosumab monotherapy, combination therapy of denosumab with vitamin D and calcium stopped the decrease in calcium caused by denosumab, inhibited bone metabolism to a greater extent, and increased BMD (especially at the hips). 展开更多
关键词 BMD TRACP Vitamin D and calcium are required at the time of denosumab administration during osteoporosis treatment NTX
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钙处理对‘巨峰’葡萄果实品质及果皮解剖结构的影响
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作者 马丽 高圣华 +2 位作者 朱绍坤 郭荐硕 孙凌俊 《北方果树》 2024年第6期23-26,共4页
为研究钙处理对‘巨峰’葡萄果实品质及果皮解剖结构的影响,该试验以6年生‘巨峰’为试材,定期喷施5g/L氯化钙水溶液,以喷清水为对照,研究钙处理对不同时期(幼果期、转色期、成熟期)果实纵径、横径、单果重、可溶性固形物、果实硬度及... 为研究钙处理对‘巨峰’葡萄果实品质及果皮解剖结构的影响,该试验以6年生‘巨峰’为试材,定期喷施5g/L氯化钙水溶液,以喷清水为对照,研究钙处理对不同时期(幼果期、转色期、成熟期)果实纵径、横径、单果重、可溶性固形物、果实硬度及果皮解剖结构的影响。结果表明,喷钙明显提高果实品质,果皮厚度明显增加,表皮细胞面积减小,且比对照排列紧实。 展开更多
关键词 葡萄 钙处理 果实品质 果皮解剖结构
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管线钢X65连铸过程絮流原因分析
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作者 张新文 俞杰 +3 位作者 轩康乐 印卫 施嘉凯 陈凯 《特殊钢》 2024年第1期65-69,共5页
通过对低碳低硫低氧铝镇静钢X65连铸过程絮流原因的分析,得出引起塞棒絮流的原因是高Ca的钙铝酸盐粘附在塞棒头部。浇注初期,塞棒头部吸热使周围钢液温度急剧下降,析出高熔点钙铝酸盐被粘附在塞棒头部,引起塞棒曲线上行。另外,通过热力... 通过对低碳低硫低氧铝镇静钢X65连铸过程絮流原因的分析,得出引起塞棒絮流的原因是高Ca的钙铝酸盐粘附在塞棒头部。浇注初期,塞棒头部吸热使周围钢液温度急剧下降,析出高熔点钙铝酸盐被粘附在塞棒头部,引起塞棒曲线上行。另外,通过热力学计算,在低碳低硫低氧铝镇静钢X65中,1 540℃时,形成12CaO·7Al_(2)O_(3)需要的w[Ca]为16×10^(-6),过量的Ca进一步反应形成高熔点钙铝酸盐。在中间包工作层、塞棒、水口、碗口等与钢水接触部位全部使用镁质耐材的条件下,在低碳低硫低氧的铝镇静钢生产时,向钢液中喂入的Ca含量越多,塞棒上行程度越严重。采用高碱度渣系和Al降低钢中的O和S,将Ca喂入量控制在0.065 0~0.071 5 kg/t,中间包w[Ca]控制在(10~15)×10^(-6),可以有效控制塞棒絮流。 展开更多
关键词 絮流 钙处理 铝含量 钙铝酸盐 管线钢
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45钢水口结瘤原因及控制
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作者 李文博 郝丽 +3 位作者 董诗朋 周胜刚 张国东 张朝磊 《河北冶金》 2024年第7期76-80,共5页
研究了45钢生产过程中中间包水口结瘤问题的原因并提出了改进措施。利用高速数据采集系统及EDX荧光分析技术监测了钢液波动情况及水口结瘤物的成分。结果表明:高熔点Al_(2)O_(3)非金属夹杂物和钙处理过程形成的CaS在中间包浸入式水口内... 研究了45钢生产过程中中间包水口结瘤问题的原因并提出了改进措施。利用高速数据采集系统及EDX荧光分析技术监测了钢液波动情况及水口结瘤物的成分。结果表明:高熔点Al_(2)O_(3)非金属夹杂物和钙处理过程形成的CaS在中间包浸入式水口内壁聚集是水口结瘤的原因。减少Al_(2)O_(3)的产生量,同时防止过量的[Ca]与[S]形成CaS是解决水口结瘤的根本措施。通过将钢水成品钙含量控制在6×10^(-6)~10×10^(-6);LF过程渣料配比二元碱度控制在3.5~5范围,做到硫含量可控,同时硫合金化前置到VD真空前;将LF离站铝含量控制在≤0.015%;VD真空后减少合金化种类,铝合金化后进行钙处理,间隔时间设定为3~5 min;钢水过热度控制在25~35℃等工艺措施改善了45钢的可浇性,实现了整浇次稳定生产,中间包水口结瘤问题随之解决。 展开更多
关键词 45钢 含硫含铝钢 中间包水口 结瘤 夹杂物 钙处理
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不同冲洗方法对根管内氢氧化钙清理效果的文献分析
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作者 郑司鹏 《新疆医科大学学报》 CAS 2024年第11期1501-1505,共5页
目的通过文献分析探究在根管治疗中将氢氧化钙Ca(OH)_(2)从根管系统中清除的最佳方法。方法以根管治疗、氢氧化钙、冲洗方法为检索词,在知网、万方、维普中文数据库中对2014年1月-2024年7月收录的相关文献进行随机对照试验(RCT)筛选,对... 目的通过文献分析探究在根管治疗中将氢氧化钙Ca(OH)_(2)从根管系统中清除的最佳方法。方法以根管治疗、氢氧化钙、冲洗方法为检索词,在知网、万方、维普中文数据库中对2014年1月-2024年7月收录的相关文献进行随机对照试验(RCT)筛选,对原始数据进行分组归类,采用SPSS 22.0软件和RevMan 5.3.5软件对数据进行系统评价。结果共获得去除根管内封药Ca(OH)_(2)的8篇RCT离体牙实验案例,对543颗离体牙进行研究,6个RCT研究的Wilcoxon检验分析结果显示,EDDY声波荡洗、PUI超声荡洗和注射器3种冲洗方法冲洗后根管内残余Ca(OH)_(2)面积,差异无统计学意义(P>0.05)。PIPS激光荡洗和PUI超声荡洗冲洗后根管内残余Ca(OH)_(2)面积,差异有统计学意义(P<0.05)。对PIPS与PUI对根管内残余Ca(OH)_(2)的清除率进行异质性检验,结果表明PIPS较PUI清洗效率高,95%CI:=4.35%~12.24%。3%NaClO+17%EDTA冲洗液对根管内Ca(OH)_(2)的清洗效果优于单一冲液,联用EDTA冲洗后,根管内残留Ca(OH)_(2)明显减少。结论在相同冲洗液的情况下PIPS激光荡洗清除根管内Ca(OH)_(2)的能力最强。 展开更多
关键词 根管治疗 氢氧化钙 冲洗方法 PIPS激光荡洗 PUI超声荡洗 EDDY声波荡洗
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钢液钙处理过程有效钙硫比对303 t超大钢锭中硫化物形貌的影响 被引量:4
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作者 周秋月 任英 +1 位作者 巴钧涛 张立峰 《工程科学学报》 EI CSCD 北大核心 2024年第4期715-722,共8页
通过工业实验研究了钙处理对303 t的16Mn重型管板铸锭中硫化物形貌的控制.未钙处理的锻件缺陷主要分布在轴向上靠近顶部、径向上在距中心1/2以内位置,缺陷主要为大尺寸Ⅱ类MnS夹杂物.采用Micro-CT检测了铸锭顶部中心位置MnS夹杂物三维分... 通过工业实验研究了钙处理对303 t的16Mn重型管板铸锭中硫化物形貌的控制.未钙处理的锻件缺陷主要分布在轴向上靠近顶部、径向上在距中心1/2以内位置,缺陷主要为大尺寸Ⅱ类MnS夹杂物.采用Micro-CT检测了铸锭顶部中心位置MnS夹杂物三维分布,夹杂物为长条状和片状,数密度为0.77 mm^(-3),最大直径为1370μm.在真空脱气后对钢液进行钙处理,钙处理不仅将钢液中原生Al_(2)O_(3)夹杂物改性为液态钙铝酸盐,并且钙会在钢液凝固和冷却过程中优于锰先与硫结合生成CaS.通过FactSage热力学计算得到,钙处理将MnS夹杂物的析出温度由1244.7℃降低至1227.9℃,同时减少了MnS夹杂物析出量.钙在改性硫化物之前先改性了钢中氧化物,因此提出了有效钙硫比Ca/Seff.用来表征钙处理对硫化物形貌的影响,Ca/Seff.的含义为改性硫化物的有效钙和钢中硫的原子浓度比,可以直接根据钢液的总氧T.O含量、总硫T.S含量和总钙T.Ca含量计算得到,此公式适用于硫质量分数小于30×10^(-6)的低硫钢.随着钢中Ca/Seff.增加,铸锭顶部硫化物长宽比逐渐减小.钙处理后钢中有效钙硫比Ca/Seff.应大于0.8,铸锭顶部硫化物平均长宽比小于1.2,CaS和MnS复合硫化物以钙铝酸盐夹杂物为核心析出,硫化物为球形且尺寸显著减小,此时钙处理改性铸锭中硫化物效果较好. 展开更多
关键词 重型铸锭 钙处理 夹杂物 硫化物形貌 有效钙硫比
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阿托伐他汀钙联合苯磺酸氨氯地平治疗动脉粥样硬化的临床研究 被引量:1
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作者 陈君 尹俊锋 逄涛 《临床医学工程》 2024年第1期37-38,共2页
目的探讨阿托伐他汀钙联合苯磺酸氨氯地平治疗动脉粥样硬化的临床效果。方法选取2020年2月至2023年2月我院收治的74例动脉粥样硬化患者,随机分为对照组(37例,苯磺酸氨氯地平)和观察组(37例,阿托伐他汀钙联合苯磺酸氨氯地平)。比较两组... 目的探讨阿托伐他汀钙联合苯磺酸氨氯地平治疗动脉粥样硬化的临床效果。方法选取2020年2月至2023年2月我院收治的74例动脉粥样硬化患者,随机分为对照组(37例,苯磺酸氨氯地平)和观察组(37例,阿托伐他汀钙联合苯磺酸氨氯地平)。比较两组的治疗效果、血脂水平及脂蛋白相关磷脂酶A2(LP-PLA2)水平。结果观察组治疗总有效率、HDL-C水平明显高于对照组,TC、TG、LDL-C及LP-PLA2水平明显低于对照组(P<0.05)。结论阿托伐他汀钙联合苯磺酸氨氯地平治疗动脉粥样硬化的效果显著,对调节患者血脂代谢、改善血管炎性状态具有积极作用。 展开更多
关键词 阿托伐他汀钙 苯磺酸氨氯地平 动脉粥样硬化 治疗效果
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Influence of calcium content on solid ratio of inclusions in Ca-treated liquid steel 被引量:6
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作者 Fangming Yuan Xinhua Wang Xuefu Yang 《Journal of University of Science and Technology Beijing》 CSCD 2006年第6期486-489,共4页
It has been found that Ca-treated liquid steel can be cast at a lower superheat. To ascertain the reason for the improved castability of Ca-treated liquid steel and to find the optimal range of calcium content, the be... It has been found that Ca-treated liquid steel can be cast at a lower superheat. To ascertain the reason for the improved castability of Ca-treated liquid steel and to find the optimal range of calcium content, the behavior of calcium in liquid steel was studied in terms of the relationship between the calcium content and solid ratio of inclusions. The relationship between the calcium content and solid ratio of inclusions was obtained by means of the classification of nonmetallic inclusions in solid and liquid steels at casting temperature according to the Al2O3-CaO-SiO2 phase diagram. The optimum calcium content should be 17-23 ppm. 展开更多
关键词 steel calcium treatment solid ratio nonmetallic inclusions FLUIDITY
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不同碱度渣对42CrMoS4钢中硫化物的影响
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作者 王旭冀 潘锡泉 +1 位作者 杨庚朝 黄振华 《特殊钢》 2024年第2期56-60,共5页
为研究不同精炼工艺对齿圈钢42CrMoS4钢中硫化物的影响,从钢中硫化物的形态与分布着手,在精炼工序设计两种不同的碱度渣和钙含量工艺,试验生产4炉。对比分析铸坯和轧材中不同双层结构复合硫化物特征与硫化物形成机理。结果表明,LF造高... 为研究不同精炼工艺对齿圈钢42CrMoS4钢中硫化物的影响,从钢中硫化物的形态与分布着手,在精炼工序设计两种不同的碱度渣和钙含量工艺,试验生产4炉。对比分析铸坯和轧材中不同双层结构复合硫化物特征与硫化物形成机理。结果表明,LF造高碱度渣(R=6.5~7.2)进RH后不进行钙处理,铸坯1/4厚度位置复合硫化物整体成块状形貌,核心内部氧化物同样也成规则的块状,轧材内部氧化物主要以CaO为主,外围硫化物主要是高CaS比例的(Ca,Mn)S,基本不变形,A类细系夹杂物级别为2.0~3.0级;在LF造弱碱度渣(R=3.6~4.2)进RH后进行二次钙处理,将w[Ca]由0.001 4%左右提升至0.002 5%~0.003 2%,铸坯1/4厚度位置复合硫化物整体成椭球状形貌,核心内部氧化物同样也成规则的球状,轧材内部氧化物为较低CaO比例的钙镁铝酸盐,外围硫化物主要是低CaS比例的(Ca,Mn)S,硫化物成纺锤状,具有很好的变形能力,A类细系夹杂物级别控制在2.0级以内。 展开更多
关键词 硫化物 钙处理 纺锤状 渣碱度 精炼工艺 夹杂物
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Effect of calcium content on inclusions during the ladle furnace refining process of AISI 321 stainless steel 被引量:6
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作者 Chao Pan Xiao-jun Hu +2 位作者 Jian-chao Zheng Ping Lin Kuo-chih Chou 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2020年第11期1499-1507,共9页
The effect of three heat processes with different calcium contents on the evolution of inclusions during the ladle furnace refining process of AISI 321 stainless steel was investigated.The size,morphology,and composit... The effect of three heat processes with different calcium contents on the evolution of inclusions during the ladle furnace refining process of AISI 321 stainless steel was investigated.The size,morphology,and composition of the inclusions were analyzed by scanning electron microscopy and energy-dispersive X-ray spectroscopy.After the addition of aluminum and titanium,the primary oxide in the AISI 321 stainless steel was an AbOs—MgO—TiOx complex oxide,in which the mass ratio of AbOs/MgO was highly consistent with spinel(MgO・AbO3).After calcium treatment,the calcium content in the oxide increased significantly.Thermodynamic calculations show that when the Ti content was 0.2wt%,the Al and Ca contents were less than 0.10wt%and 0.0005wt%,respectively,which was beneficial for the formation of liquid inclusions in molten steel.Moreover,the modification mechanism of calcium on TiN-wrapped oxides in combination with temperature changes was discussed. 展开更多
关键词 INCLUSIONS stainless steel calcium treatment thermodynamic calculation
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褐藻胶生产废钙水处理及回用方法研究
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作者 范嘉新 王智慧 +4 位作者 段蕊 张俊杰 陈梓沫 惠锋基 丛威 《科技创新与应用》 2024年第30期136-139,共4页
作为一种天然产物,因使用安全、易加工及稳定性好等优良的性质,褐藻胶在食品、保健品、医药等健康产业中的需求日益增加。但是,褐藻胶生产过程中水资源需求量大,同时也排放大量的废水。每生产1 t褐藻酸钠消耗大约1000 t淡水,排放约900 ... 作为一种天然产物,因使用安全、易加工及稳定性好等优良的性质,褐藻胶在食品、保健品、医药等健康产业中的需求日益增加。但是,褐藻胶生产过程中水资源需求量大,同时也排放大量的废水。每生产1 t褐藻酸钠消耗大约1000 t淡水,排放约900 t废水,其中,约90%的废水为废钙水。综述废钙水的处理技术和回用方法,分析废钙水处理及回用存在的问题,为废钙水的处理回用技术的发展提供参考。 展开更多
关键词 褐藻胶 废钙水处理 回用 化学沉淀 膜分离 离子交换
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基于蒸制处理的黄精麻味物质研究
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作者 王家璇 王锋 +2 位作者 李清明 李文佳 苏小军 《食品与机械》 CSCD 北大核心 2024年第4期165-171,共7页
目的:探索黄精产生麻味特征的物质基础。方法:采用“九蒸九制”的方法对8个产地的黄精进行炮制,并分析不同蒸制次数下黄精中皂苷、多酚、草酸钙针晶含量的变化;采用细胞溶血率试验以及感官评价方法评价黄精麻味程度的变化,并进行麻味相... 目的:探索黄精产生麻味特征的物质基础。方法:采用“九蒸九制”的方法对8个产地的黄精进行炮制,并分析不同蒸制次数下黄精中皂苷、多酚、草酸钙针晶含量的变化;采用细胞溶血率试验以及感官评价方法评价黄精麻味程度的变化,并进行麻味相关性分析。结果:随着蒸制次数的增加,不同产地的黄精中多酚和皂苷含量均呈先升后降的趋势,而草酸钙针晶含量、细胞溶血率以及麻味评分均逐渐下降;相关性分析表明,草酸钙针晶含量与黄精麻感程度之间呈显著正相关(P<0.05)或者极显著正相关(P<0.01);扫描电镜结果显示,蒸制处理后草酸钙针晶结构逐步遭到破坏,与黄精麻味的变化规律相吻合。结论:草酸钙针晶是黄精具有麻味特征的关键物质。 展开更多
关键词 黄精 麻味物质 皂苷 多酚 草酸钙针晶 蒸制处理
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