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排序方式: 共有13条查询结果,搜索用时 15 毫秒
1.
用离子-电子法配平氧化还原反应方程式时,无论在什么介质下反应,配平时先按酸性介质进行配平,然后再根据实际介质,采取在反应式两边添加一定数量OH-的方法进行转变。该方法化难为易,易于掌握,特别是对于在碱性和中性介质中进行复杂的氧化还原反应方程式的配平尤为简便快捷。  相似文献   
2.
文章重点介绍了智能监控管理的技术特点和硬件结构,分析了智能监控软件流程和优化管理系统的运行机制,总结了该技术的优缺点和应用前景。  相似文献   
3.
Though the concept of ‘stylized fact’ plays an important role in the economic literature, there is little analysis of the definition and evaluative use of the term. A permissive account of stylized facts is developed which focuses on their mediating role between models and empirical evidence. The mediation relationship restricts stylized facts by requiring concrete empirical targets. On the other hand, there is much legitimate diversity within the permissive account; key dimensions of diversity are argued to be the part of the model targeted (explanans vs. explanandum) and degree of partiality of correspondence. The use of stylized fact in model evaluation points to the downside of stylization: decreased ability to support strong claims about particular targets. In the final analysis, the role of stylized facts in model-based explanation depends on the view taken of the relative importance of generality and empirical adequacy.  相似文献   
4.
用离子-电子法配平氧化还原反应方程式时,无论在什么介质下反应,配平时先按酸性介质进行配平,然后再根据实际介质,采取在反应式两边添加一定数量OH-的方法进行转变。该方法化难为易,易于掌握,特别是对于在碱性和中性介质中进行复杂的氧化还原反应方程式的配平尤为简便快捷。  相似文献   
5.
The two lines of origin of the modern tourist guide are the pathfinder and the mentor. These are the antecedents, respectively, of the leadership and the mediatory spheres in the guide's role. Since each has an inner and an outer directed aspect, four major components of the role are distinguished: the instrumental, social, interactionary, and communicative. The dynamics of development of the role from the Original to the Professional Guide is represented as a transition of emphasis from the instrumental to the communicative component. Aside from this main line of development, two new role types have differentiated: the Animator and the Tour-leader, emphasizing, respectively, the social and the interactionary components. The Original Guide's function is to produce attractions in the marginal regions of the ecological tourist system, while that of the Professional Guide is to reproduce the attractions in the central regions of the system.  相似文献   
6.
This study assesses the de jure and de facto land market legal restrictions in the Tigray region in Ethiopia and the extent of implementation of the new land rental restrictions that were introduced in 2006 that state that not more than 50% of a farm can be rented out. The knowledge, perceptions and attitudes regarding the law among local Land Administration Committee (LAC) members, local conflict mediators and a sample of rural households are investigated. We find that the rented area restriction is commonly violated and not enforced. The law is circumvented by framing sharecropping as something other than land rental, although sharecropping is the dominant land rental contract in the region. When it is made clear that the law may hurt weak and vulnerable (often female-headed) households that are unable to farm their land themselves and therefore rent it out, the large majority of LAC members, conflict mediators and rural households are against the law.  相似文献   
7.
新能源钒电池及其充电控制技术   总被引:2,自引:0,他引:2  
针对一种新型的储能钒电池的应用以及充电控制问题,设计了一种基于PIC单片机的钒电池充电控制器,单片机不断采集钒电池的电压、电流和温度等信息,根据钒电池的充电特性,利用PWM输出驱动开关管对钒电池进行充电,同时提供了针对过压、过流、超温和断流的保护机制。重点介绍了控制器的硬件结构,分析了充电控制的软件流程和安全监控管理系统的运行机制,最后总结了该充电控制技术的优缺点和应用前景  相似文献   
8.
ABSTRACT

Purpose: The article synthesizes the extensive empirical work on relationship marketing (RM) and compares the various conceptualizations to give a better understanding of the relational factors (i.e., characteristics of the business relationship) that improve a seller’s objective performance (i.e., share of business) in a business-to-business (B2B) services context. These conceptualizations, taken from the literature, link relational antecedents (i.e., communication, domain expertise, relational value, and mutual goals) to relational mediators (i.e., trust, satisfaction, commitment, relationship quality) to explore how they in turn affect a seller’s share of business.

Methodology/approach: All 4 models derived from the literature review were assessed using a dataset drawn from a survey of 948 client firm representatives of a Portuguese hotel chain in a B2B services context.

Findings: The best of the models in terms of model fit and prediction of share of business shows that only customer commitment directly drives a seller’s share of business, and simultaneous interrelated changes in customer trust and satisfaction, as well as customer perceptions of relational value, drive customer commitment, and so exert indirect effects on performance. The model that proposes that a seller’s performance is strengthened by simultaneous interrelated improvements in customer trust, satisfaction, and commitment (i.e., with these three mediators being conceptualized as a single, combined, higher-order mediator, termed relationship quality [RQ]) shows inferior fit. No combination of mediators (satisfaction, trust, or commitment) improves the seller’s objective performance over and above their individual effects (i.e., there are no synergistic effects).

Research implications: The literature review suggested four ways of modeling RM antecedents, mediators, and their effect on performance. Complex second-order constructs such as RQ lack explanatory power when predicting outcomes and mask the effects of individual relational mediators. Correct conceptualization is important, as conclusions vary drastically even with the same set of relational mediators and same dataset.

Practical implications: B2B service providers’ investments in RM will lead to improved share of business only if customer commitment is high or there is at least the potential to improve it. This requires an understanding of how valuable

the customer believes the relationship to be, and how the customer rates the relationship with the firm in terms of satisfaction and trust. A customer segmentation approach to relationship building and maintenance is advocated and detailed suggestions are put forward.

Originality/value/contribution: Apart from the work by Palmatier, the relationships between RM antecedents and mediators have not yet been examined simultaneously and findings are fragmented. The article provides a synthesis of this expansive literature. It contrasts different interplays between RM mediators, including their interrelationships as a higher-order construct, and explores possible synergy effects. Unlike previous work, this study focused on an objective measure of seller performance (i.e., share of business), whereas previous studies have tended to examine subjective measures, especially within the B2B context. Furthermore, four full models were assessed here, each of which included the antecedents to RM mediators and their links to objective performance.  相似文献   
9.
考察了海藻酸钙固定化1,5-二氯蒽醌对偶氮染料酸性红B厌氧生物脱色的强化作用。结果表明,在不考虑各因子间交互作用的条件下,固定化1,5-二氯蒽醌强化酸性红B厌氧生物脱色的最适条件为温度35℃,pH值7.0~8.0,LB培养基。NaCl浓度对脱色过程有一定的影响;当初始染料质量浓度≤500mg/L,染料浓度不会成为1,5-二氯蒽醌强化酸性红B厌氧生物脱色的限制性因素。脱色过程中,随着脱色率的增加,体系氧化还原电位(ORP)不断下降。该研究可为介体强化偶氮染料生物脱色技术的实际应用提供理论基础。  相似文献   
10.
目的探讨自拟中药方剂养胃汤加减治疗慢性萎缩性胃炎患者的疗效。方法选取2018年11月至2019年11月营口市中医院收治的100例慢性萎缩性胃炎患者作为研究对象,随机分为胃复春片组与联合用药组,各50例。胃复春片组给予胃复春片,联合用药组在对照组治疗基础上采用自拟中药方剂养胃汤加减治疗,比较两组中医证候积分,炎症介质及胃泌素-17(G-17)、胃蛋白酶原Ⅰ(PGⅠ)、胃蛋白酶原Ⅱ(PGⅡ)水平,一氧化氮(NO)、超氧化物歧化酶(SOD)、丙二醛(MDA)水平及不良反应。结果治疗后联合用药组胃刺痛、胃脘胀满、食少纳呆、消瘦及乏力积分低于胃复春片组(P<0.05);治疗后,联合用药组CRP、TNF-α及IL-6水平低于胃复春片组(P<0.05),G-17、PGⅠ、PGⅡ高于胃复春片组(P<0.05);治疗后,联合用药组NO、SOD水平高于胃复春片组(P<0.05),MDA水平低于胃复春片组(P<0.05);两组不良反应发生率比较,差异无统计学意义(P>0.05)。结论自拟中药方剂养胃汤加减治疗慢性萎缩性胃炎能有效缓解患者症状,减轻机体炎症反应,未增加不良反应发生率。  相似文献   
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