新型斜交胎成型机

国家发明专利喷气牵引帘布筒式斜交载重轮胎成型机,反包胶囊内压精密控制、左侧机组（尾架）横向平移、前置式胎面供料压贴机构等均为国内首创,是斜交轮胎成型机理的更新换代产品。     

新型斜交胎成型机

国家发明专利喷气牵引帘布筒式斜交载重轮胎成型机 ,反包胶囊内压精密控制、左侧机组 (尾架 )横向平移、前置式胎面供料压贴机构等均为国内首创 ,是斜交轮胎成型机理想的更新换代产品。     

新型高精度载重斜交轮胎成型机在贵轮投入使用

目前 ,载重斜交轮胎产量仍然很大 ,而用于生产载重斜交轮胎的成型机多为有成型棒的老式成型机。这种成型机在成型胎坯过程中 ,帘布筒、缓冲层和胎面都存在着较大的不均匀伸张变形 ,另外还有歪斜偏差大和扣圈定位精度低等缺点。针对这种状况 ,天津橡塑机械联合有限公司用了半年多时间开发完成了新型 2 0 2 4系列斜交轮胎成型机。这种新型斜交轮胎成型机的主要技术特点是 :(1 )采用伺服电机驱动气垫式帘布筒传递环 ,将帘布筒自动悬拉到成型鼓上 ,这种新的上布筒方式既保证了布筒均匀受力伸张 ,又能达到准确定位。(2 )扣钢丝圈后的正包和反包 ,…     

非公路型斜交轮胎的子午化改造

介绍非公路型斜交轮胎的子午化改造方法。采用大部分现有斜交轮胎的生产设备,通过技术改进,提高轮胎制造精度。改造内容包括增加帘布筒径向贴合鼓,或在一段成型机上增加帘布供料架,增加二段成型装置;增加带束层纤维帘布裁断机,借用带束层全钢帘布裁断机。胎体采用纤维帘线,带束层采用纤维帘线或钢丝帘线,通过生产全纤维子午线或半钢子午线轮胎,实现斜交轮胎产品的更新换代。     

胶囊反包工程机械轮胎成型机

介绍新开发的LC-G25sd和LC-G24otani工程机械轮胎成型机结构和技术参数。其主动折鼓结构可以在不停机的状态下实现折鼓,使成型鼓折叠和张圆安全、可靠、效率高且无冲击;帘布筒扩导和夹持环传递、喷气辅助导布及机械牵引定位结构可使帘布筒不会产生喇叭口变形,提高了正包质量;编程调速差动组合压辊可以设定较为理想的滚压曲线,保证轮胎的成型精度。     

新型斜交胎成型机

日前,国家石油和化学工业局科技办在荣成对LCX2024B-YT斜交轮胎成型机进行了鉴定。该机由北京云泰新技术研究所研制,在山东荣达橡胶制品有限公司投入实际生产运行,效果良好,轮胎成型质量和生产效率都有明显提高,有效地减轻了操作劳动强度,可实行单人操作,性能稳定可靠,自动化程度高。产品经国家橡胶机械质量监督检验中心按国家标准和企业标准检测符合要求。该机采用指形正包、胶囊反包、喷气牵引布筒、胶囊内压控制、高精度胎面供贴和尾架平移技术。其中喷气牵引布筒、胶囊内压控制和尾架平移技术,系国内首次采用,具有创新性。鉴定委员会…     

斜交轮胎成型帘布筒采用等宽明暗级差贴合法

介绍了载重斜交轮胎成型帘和布筒等宽明暗级差贴合法,等宽明暗级差,意指帘布筒帘布层等宽,由一侧向另一侧等比例依次错边,一侧为明级差,另一侧为暗级差,与以往采用的不等宽明级差帘布筒相比,这种帘布简便于管理,可提高生产效率,增加经济效益。由于帘布层规格减少,帘布卷相应减少,采用等宽明暗级差合法仅垫布和木轴的消耗每年好可节约４．５万元。     

高精度载重斜交轮胎成型机

介绍了高精度载重斜交轮胎成型机的主要特点、结构和性能,该系列成型机实现了上帘布筒、帘布正包、反包及扣圈等成型操作的自动化、使成型精度和产品质量明显提高;在XJL－LCX2024A型成型机上成型9.00-20轮胎的操作时间仅为6min。     

国产LC2024斜交轮胎胶囊反包成型机简介

国产ＬＣ２０２４斜交轮胎胶囊反包成型机主要由主机箱,正反包装置,左侧机组、帘布筒扩张器、下压辊和电气控制部分组成,可成型胎圈直径为５０８－６１０ｍｍ的斜交载重、工业车辆和农业轮胎,成型鼓转速为２０－２４０ｒ．ｍｉｎ＾－１。工艺操作从进入正反包装置起,自动进行正包,扣圈和反包作业,全自动操作时间约为６０ｓ。     

空气阻尼缓冲气缸在帘布筒贴合机上的应用

帘布筒贴合机用于斜交普通轮眙成型之前的帘布筒贴合。它的性能如何直接关系到生产轮胎的产品质量。对帘布筒贴合机性能的主要要求是: 1.工作辊筒起停动作灵敏、安全可靠; 2.所有运动副工作无冲击和噪声; 3.弹性压辊对帘布筒的压力均衡适度,夹层无气泡,贴合可靠。此外,还要求机器外形美观大方,结构合理牢固,检修方便。建阳橡胶机械厂设计、制造的LT系列帘布筒贴合机,成功地采用了空气阻尼缓冲气缸作为弹性压辊的驱动力,达到了无噪声、无冲击,并能保压的良好效果。空气阻尼缓冲气缸的原理及结构介绍如下     

Mechanisms Governing Anaphylaxis: Inflammatory Cells,Mediators, Endothelial Gap Junctions and Beyond

Anaphylaxis is a severe, acute, life-threatening multisystem allergic reaction resulting from the release of a plethora of mediators from mast cells culminating in serious respiratory, cardiovascular and mucocutaneous manifestations that can be fatal. Medications, foods, latex, exercise, hormones (progesterone), and clonal mast cell disorders may be responsible. More recently, novel syndromes such as delayed reactions to red meat and hereditary alpha tryptasemia have been described. Anaphylaxis manifests as sudden onset urticaria, pruritus, flushing, erythema, angioedema (lips, tongue, airways, periphery), myocardial dysfunction (hypovolemia, distributive or mixed shock and arrhythmias), rhinitis, wheezing and stridor. Vomiting, diarrhea, scrotal edema, uterine cramps, vaginal bleeding, urinary incontinence, dizziness, seizures, confusion, and syncope may occur. The traditional (or classical) pathway is mediated via T cells, Th2 cytokines (such as IL-4 and 5), B cell production of IgE and subsequent crosslinking of the high affinity IgE receptor (FcεRI) on mast cells and basophils by IgE-antigen complexes, culminating in mast cell and basophil degranulation. Degranulation results in the release of preformed mediators (histamine, heparin, tryptase, chymase, carboxypeptidase, cathepsin G and tumor necrosis factor alpha (TNF-α), and of de novo synthesized ones such as lipid mediators (cysteinyl leukotrienes), platelet activating factor (PAF), cytokines and growth factors such as vascular endothelial growth factor (VEGF). Of these, histamine, tryptase, cathepsin G, TNF-α, LTC₄, PAF and VEGF can increase vascular permeability. Recent data suggest that mast cell-derived histamine and PAF can activate nitric oxide production from endothelium and set into motion a signaling cascade that leads to dilatation of blood vessels and dysfunction of the endothelial barrier. The latter, characterized by the opening of adherens junctions, leads to increased capillary permeability and fluid extravasation. These changes contribute to airway edema, hypovolemia, and distributive shock, with potentially fatal consequences. In this review, besides mechanisms (endotypes) underlying IgE-mediated anaphylaxis, we also provide a brief overview of IgG-, complement-, contact system-, cytokine- and mast cell-mediated reactions that can result in phenotypes resembling IgE-mediated anaphylaxis. Such classifications can lead the way to precision medicine approaches to the management of this complex disease.     

Hydrocarbon components of the yellowheaded spruce sawfly sex pheromone

The primary sex pheromone of the yellowheaded spruce sawfly,Pikonema alaskensis (Rohwer) (Hymenoptera: Tenthredinidae), was found to include a series of straight-chain hydrocarbon dienes, all with the double bonds in the 9 and 19 positions and all with the (Z, Z) configuration. The major components, of 29, 31, 33, 35, and 37 carbon atoms, were synthesized. In the field and the greenhouse, the synthetic dienes were far above control levels in activity but, at least during the first hours of bioassay, were somewhat less active than the female-derived materials on a weight basis. In the field, a mixture of all five synthetic dienes, in the proportions found in the females, was more attractive than any single one, on a mole basis. In addition, (Z, Z)-9,19 dienes of 28, 30, 32, 34, 36, 38, and 39 carbons have been detected in females in minor amounts. The first five were bioassayed, and each was found to be similar in activity to the 35-carbon component when compared on a weight basis. The synthetic dienes, while active by themselves, were strongly synergized by two, more polar, Florisil fractions derived from females. Experimental design considerations are discussed.     

Organokines in Rheumatoid Arthritis: A Critical Review

Rheumatoid arthritis (RA) is a systemic autoimmune disease that primarily affects the joints. Organokines can produce beneficial or harmful effects in this condition. Among RA patients, organokines have been associated with increased inflammation and cartilage degradation due to augmented cytokines and metalloproteinases production, respectively. This study aimed to perform a review to investigate the role of adipokines, osteokines, myokines, and hepatokines on RA progression. PubMed, Embase, Google Scholar, and Cochrane were searched, and 18 studies were selected, comprising more than 17,000 RA patients. Changes in the pattern of organokines secretion were identified, and these could directly or indirectly contribute to aggravating RA, promoting articular alterations, and predicting the disease activity. In addition, organokines have been implicated in higher radiographic damage, immune dysregulation, and angiogenesis. These can also act as RA potent regulators of cells proliferation, differentiation, and apoptosis, controlling osteoclasts, chondrocytes, and fibroblasts as well as immune cells chemotaxis to RA sites. Although much is already known, much more is still unknown, principally about the roles of organokines in the occurrence of RA extra-articular manifestations.     

Field evidence of synergism and inhibition in the sesiidae sex pheromone system

The E,Z, Z,Z, and Z,E geometric isomers of 3,13 octadecadien-1-ol acetate were used singly and in binary combinations to trap sesiids in Wisconsin cherry orchards. The Z,E isomer alone did not capture any sesiids. A synergistic effect, however, of Z,E onSynanthedon pictipes response to its pheromone E,Z was demonstrated for the first time. Strong inhibitory effects of the Z,Z isomer onS. pictipes response to E,Z, and of the E,Z isomer onS. scitula response to Z,Z, were found. As little as 0.5% of Z,Z in E,Z completely inhibited theS. pictipes response. This species' response was also reduced by 85% when Z,Z was evaporated at 4 points, each ca. 6 m from the pheromone trap. Consistencies and discrepancies of the data with relevant experimental results from other geographical areas are briefly discussed.Lepidoptera: Sesiidae (=Aegeriidae), the clearwing moths.Research supported by the College of Agriculture and Life Sciences, University of Wisconsin, Madison, and by the Wisconsin Red Tart Cherry Ind. Market. Order.     

Soil nutrient depletion by agricultural production in Southern Mali

The degree of soil mining by agricultural production in Southern Mali is assessed by calculating nutrient balances: differences between the amount of plant nutrients exported from the cultivated fields, and those added to the fields. Export processes include extraction by crops, losses due to leaching, to erosion, and to volatilization and denitrification. Inputs include applications of fertilizer and manure, restitution of crop residues, nitrogen fixation, atmospheric deposition of nutrients in rain and dust, and enrichment by weathering of soil minerals. Nutrient balances are calculated for N, P, K, Ca, and Mg. Both pessimistic and optimistic estimates are given.The resulting figures indicate, even when the most optimistic estimates are used, large deficits for nitrogen, potassium and magnesium. For the region as a whole, the calculated deficits are -25 kg N/ha,-20 kg K/ha, and -5 kg Mg/ha. Further, acidification is to be expected, in particular in areas where cotton is grown. The deficits are caused by traditional cereal crops, but also by cotton and especially by groundnut. The latter two crops are fertilized, but insufficiently. It is important to note, that the negative figures are not automatic recommendations for application of a specific amount of additional fertilizer. For phosphorus and calcium the balance of the region as a whole appears to be about in equilibrium, but locally large variations may occur.Erosion and denitrification are important causes of nutrient loss, accounting respectively for 17 and 22% of total nitrogen exports. Atmospheric deposition and weathering of minerals in the soil are still important nutrient inputs that contribute as much as nutrients as organic and mineral fertilizer combined. Nutrient depletion is very large in comparison to the amount of fertilizer applied. Drastic options, such as doubling the application of fertilizer or manure, or halving erosion losses, even if feasible, would still not be enough to make up for the calculated deficits.The annual value of withdrawn nutrients, if related to prices of fertilizers, varies between 10,000 and 15,000 FCFA/ha (40-60 US $/ha). Since the estimated average gross margin from farming in this area is 34,000 FCFA/ha (123 US $/ha), soil mining appears to provide an amount equal to 40% of farmers' total income from agricultural activities.     

微波消解-石墨炉原子吸收法测定唇膏中4种金属的含量

唇膏经微波消解,石墨炉原子吸收光谱法测定样品中铅、锰、铬、镉的含量。在优化的仪器工作条件下,质量浓度分别在32.0、8.0、8.0、8.0 mg/L范围内呈良好的线性关系,检出限分别为4.2、3.5、2.3、2.5μg/L,测得回收率在98%~103%之间,精密度分别为4.1%、3.6%、3.9%、2.7%。     

陶瓷名物探源二则

匋、陶、窑(窯)上古皆读成舌头音,意义又相通,实际为一个意义上先后产生的几个形体不同的字,先民以陶(匋)既称呼窑灶,又指窑灶出品之物,又指制作陶器;坏(坯)、瓶、瓬、瓿、甂、缶、钵、皿、杯(盃)、盆(瓫)均指窑灶所出之物或后世模仿窑灶出品之物,其字皆由重唇音演变而来,亦为同胞兄弟的同源词。     

典型过程强化技术在纳米材料制备中的应用进展

纳米材料被誉为21世纪的新材料,广泛应用于化工、电子、国防、陶瓷等领域.传统的纳米材料制备方法面临粒径控制较困难、批次间重复性差,存在放大效应等不足.过程强化技术是化学工程学科的研究前沿和热点方向之一,旨在通过在生产过程中采用新工艺、新设备等手段,实现缩减操作单元、减小设备体积、提高生产能力及能量利用效率的目的,是实现...     

木质素纳米颗粒的制备及其功能化应用研究进展

木质素是一种天然生物质资源,来源广泛,成本低廉。近年来,利用纳米技术将木质素制备成木质素功能化纳米颗粒极大推动了木质素的利用,同时显著解决了传统材料无法解决的突出问题。详细介绍了木质素功能化纳米颗粒的自组装法、机械法、聚合组装法、冻干炭化法等制备方法及其在催化剂、助剂、吸附剂、紫外防护和抗氧化、抗菌、载体材料、聚集诱导发光材料等领域的应用研究,展望了木质素纳米颗粒的应用前景。指出实现木质素纳米颗粒的可控制备、功能化修饰,将有利于推动木质素功能化纳米颗粒在环保、能源、催化和生物医学等领域的进一步应用。     

明胶分子量分布测定和表征的研究进展(二)

<正> 6.SDS—PAGE(十二烷基硫酸钠-聚丙烯 酰胺凝胶电泳)法 从1959年Raymond和1964年Davis用聚丙烯酰胺凝胶分离人血清蛋白成功后,聚丙烯酰胺凝胶电泳得到了广泛的发展,成为分离、分析蛋白质、核酸类生物