泡沫铝在船舶舱室中的降噪应用

针对船舶舱室内的噪声问题,利用阻性吸声材料泡沫铝无毒、阻燃、无粉尘、工艺性能好的特点,模拟舱室环境,对舱室进行了噪声治理。模拟结果表明加泡沫铝后,可以使舱室空气噪声平均降低约10dB,具有显著的降噪效果。     

泡沫铝在船舶舱室中的降噪应用

针对船舶舱室内的噪声问题,利用阻性吸声材料泡沫铝无毒、阻燃、无粉尘、工艺性能好的特点,模拟舱室环境,对舱室进行了噪声治理。模拟结果表明加泡沫铝后,可以使舱室空气噪声平均降低约10dB,具有显著的降噪效果。     

创新地图

泡沫体公园治理北京雾霾 一个能够包裹公园的“巨大泡沫”，学校操场也可包在这种小型洁净空气系统里。泡沫公园就是一个大植物园，为周围的公寓、运动场、医院和商场等提供清新空气。泡沫结构体是模拟树叶或蝴蝶翅膀纹理制造的一种特殊材料，成本低廉，     

船舶舱室空气再生技术现状与研究展望

为了实现真正的船舶舱室空气再生技术,我们对于相关技术方法进行了综合分析与探索,比如特种氧化法,氧烛法,高压氧瓶法,电解水法等。但是这些方法并不能完美的解决船舶舱室空气再生这一问题,所以我们结合文献找到了基于特定海洋生物的船舶舱室空气再生这一方法,从一些初步的研究结果可以看出这种方法有望实现调节舱室内氧气和二氧化碳的。     

某平台消防泡沫罐服役环境适用性评价分析

文章通过模拟316ss不锈钢泡沫罐与海洋大气、泡沫罐与泡沫液产品接触的实际情况,对泡沫罐产品在某平台服役环境下的适用性进行评价分析。分别对不锈钢母材、焊缝分别取样,开展盐雾腐蚀模拟实验、泡沫液介质环境下腐蚀模拟实验及电化学分析。结果显示,不锈钢母材及焊缝的抗盐雾腐蚀能力较强。在常温常压、加速条件下泡沫液介质环境中,不锈钢母材与焊缝抗介质腐蚀能力较强,且在该腐蚀环境中,焊缝与母材之间不会发生电偶腐蚀。经评价分析,316ss不锈钢泡沫罐产品在平台服役环境下的适用性良好。     

我国房产政策抑制泡沫有效性的实验研究

近年来，我国一、二线城市的房地产价格普遍迅速上涨，出现了较为严重房产泡沫。2017年，我国政府提出的 房地产税改革、 一揽子政策组合拳等举措再次引发激烈讨论。本文采用实验经济学方法，在计算机化的实验环境中设置房产交易市场，模拟房产交易，从而分析了房产价格泡沫产生的原因与过程，检验了我国现存各项房产政策抑制房产市场泡沫的作用大小。结论为：房产价格泡沫主要产生于交易者的“竞争非理性”，增加交易费用、单方面征收房产税对房产泡沫的抑制作用并不明显，限贷、提高首付比例等政策可较为有效地抑制房产泡沫；房产政策的“组合拳”往往对抑制泡沫更为有效。     

空气泡沫耦合增效作用物模试验研究

本文提出一种新的空气泡沫驱替方式,采用强发泡体系与超低界面张力起泡体系交替注入的方式进行物理模拟试验研究,研究证明耦合式空气泡沫驱油较常规强发泡体系驱油提高采收率6个百分点以上,具有较好的驱油效果。     

FPSO舱室不停产改造安全评价

为了解决中国海洋石油某FPSO不停产完成舱室改造的难题,以法律政策为依据,构建了安全评价体系,通过专家评议法、预先风险分析(PHA)、事故树等评价方法,从设计、施工、生产维护等各阶段进行了综合评价,保障了该FPSO生产污水处理系统的升级优化,提升了管理水平。本次评价对海洋石油工程不停产施工等高风险作业,尤其是FPSO舱室改造类项目有很好的借鉴意义。     

磁性调压器的故障诊断及修理

真空铝铅焊炉是我厂加工焊接各种铝构件的重点设备,加热部分由6路磁性调压器控制,这种控制具有过载能力强、无噪声、工作可靠、调节方便的特点,不足之处就是磁性调压器的控制绕组感应电压过高,多次发生击穿控制绕组故障,以前都是送往生产厂家修理,但费用高,周期长,影响厂内的生产进度。 这次调压器发生绕组击穿后,使用车间为节约费用和时间,组织自行修理,拆除已击穿的磁性调压器绕     

泡沫金属相变材料凝固传热过程的数值分析

利用计算流体力学软件FLUENT凝固/熔化模型,对填充以及未填充泡沫金属的2种相变材料蓄热球的相变传热过程进行数值模拟研究,得到了在第1类边界条件下蓄热球放热过程中的温度场分布、相界面移动规律.研究结果,表明与单纯填充相变材料的蓄热球相比,填充泡沫金属的相变材料蓄热球可以有效减少其放热时间,提高蓄热系统的放热速率.     

Divergent patterns of engagement in Internet standardization: Japan,Korea and China

This article analyzes the engagement of Japanese, Korean and Chinese participants in the development of Internet standards at IETF on the basis of four quantitative metrics: attendance, patenting, authorship and leadership. The results are strikingly divergent. Japanese involvement in Internet standardization began early and Japan was, for many years, second only to the U.S. in terms of IETF participation. Though Japanese participation has declined since the early 2000s, Japan remains a major contributor to IETF standardization. Korean involvement in IETF has always been significant, but below the levels of Japan and major European countries. Korean participation in IETF has also declined over the past decade, and has been dominated by one firm, Samsung. Though meaningful Chinese involvement in IETF did not begin until the mid-2000s, it has rapidly expanded in recent years. Today, China is a major player in numerous areas of Internet standardization in terms of three metrics (participation, patenting and leadership), and is rapidly gaining in terms of document authorship as well. Most of China׳s recent IETF involvement can be attributed to Huawei, though other Chinese firms have recently begun to increase their participation in the organization. Thus, contrary to some views that China׳s engagement with standardization is primarily one of indigenous innovation and “catching up”, China׳s experience with IETF demonstrates deliberate and effective engagement with a major Western standards-development organization on its own terms.     

Comparing FTTH access networks based on P2P and PMP fibre topologies

There is an ongoing discussion in the market which Next Generation Access (NGA) architecture best suits future needs and which investment and cost differences exist. The discussion can be subsumed as P2P vs. GPON, which is somewhat misleading as this article reveals. The discussion is driven by the fact that the high capital cost and the long asset life time of fibre mean that the technology choices made today will dominate the opportunities for telecommunication business of all market players, incumbents, competitors, content providers and business and residential users for many years in the future.The paper analyzes the cost and other differences between Fibre-to-the-Home (FTTH) access network architectures and their related different wholesale approaches by using the well-known and understood steady state approach applied in other NGA analyses in the past. In addition to the steady state analysis a dynamic cost evaluation is included taking into account the different investment behaviour of the FTTH architectures over time. The results describe investment and cost differences between architectures, incumbents and wholesale based competitive operators. The analysis has been performed for different geotypes (clusters) of decreasing population density in a representative European settlement structure.     

Whose Image is it Anyway?: Some Considerations of the Curricular Importance of Subject Image in Secondary School Design and Technology Education

This paper explores the idea that a sense of school subject image is a necessary feature of curriculum management and a potent force for change. The discussion centres on the view that all school subjects have an image and that if those intimately involved with the subject do not control the image then someone else does! In such circumstances the image is the product of past encounters and old euphemisms and is unlikely to hold the changed realities.The UK developments in Design and Technology education (the term Design and Technology is used to denote the school subject defined under this heading by the UK National Curriculum, 1995) have created something of an image problem which has interesting international parallels. Some of these problems are due to clearly discernible internal tensions and an ambiguous relationship with other subject areas.Through greater attention to subject image internal controversies might be acknowledged and resolved, relationships with other subject areas can be more meaningfully understood and practitioners can be helped to make sense of curriculum change.     

Indigenous peoples’ nutrition transition in a right to food perspective

In indigenous communities the nutrition transition characterized by a rapid westernization of diet and lifestyle is associated with rising prevalence of chronic disease. Field work and literature reviews from two different policy environments, Argentina (Jujuy) and Canada (Nunavut), identified factors that add to indigenous peoples’ disease risk. The analytical framework was the emerging human right to adequate food approach to policies and programmes. Indigenous peoples’ chronic disease risk tends to increase as a result of government policies that infringe on indigenous peoples’ livelihoods and territories, undermining their economic system, values and solidarity networks. Policies intended to increase food security, including food aid, may also fuel the nutrition transition. There is a need to explore further the connection between well-intended policies towards indigenous peoples and the development of chronic diseases, and to broaden the understanding of the role that different forms of discrimination play in the westernization of their lifestyles, values and food habits. Food policies that take due account of indigenous peoples’ human rights, including their right to enjoy their culture, may counteract the growth of chronic disease in these communities.     

A strategic skill based model of supplier integration and its effect on supply management performance

Supplier integration is a tool to help organizations gain competitive advantage. Strategic supply management skills and the supply management function's perceived status are hypothesized as antecedents to supplier integration leading to supply management performance. The sample for this study includes 152 executive level supply management professionals. The empirical results suggest that strategic skills and perceived status are essential antecedents to supplier integration and subsequent performance. Further, the relationship between strategic skills and performance is mediated by supplier integration. Results of a dominance analysis also suggest which strategic skills are most likely to explain status integration, and performance. These findings have significant implications for supply management theory and practice.     

Cost allocation of WCDMA and wholesale pricing for mVoIP and data services

This study estimates cost-based prices for wholesale voice and data services provided to 3G (WCDMA) MVNOs according to their distinct types. For estimation, 3G MVNOs are classified into different types, and the overall cost of WCDMA facilities are separated into voice and data components based on their subscriber rates, actual traffic rates, as well as efficiency consideration of traffic rates. The study then calculates cost-based wholesale prices of voice and data services for each of the 3G MVNO types. The result of this study shows that a cost-plus pricing scheme can help achieve the policy goals of the regulator, namely, lowering telecommunications tariffs and facilitating the introduction of new convergent-type services, far more effectively than the current retail-minus pricing scheme. The findings of this study may assist firms in developing business models based on 3G networks and telecom regulators in designing policies related to interconnection, mVoIP, prepaid calls, wholesale services, and network neutrality.     

Collectivism,individualism, and outgroup cooperation in a segmented China

A consistent theme in cross-cultural management research is that collectivists are more cooperative than individualists. We use Hofstede's measure for individualism–collectivism and combine it with an experimental measure of cooperation to test this relationship in China. In contrast to the established paradigm, we find that groups with higher individualistic scores are more cooperative than those groups with higher collectivistic scores. We attribute these results to groups being composed of outgroup members. In addition, we find that subjects from the more developed coastal area are more individualistic and cooperative than are subjects from inland China.

面向对象的程序设计

用Ｃ＋ ＋ 语言阐述面向对象程序设计中封装和继承的概念以及在实际中怎样运用这些概念提高程序设计水平。     

蒸汽热量计量应用的探析

研究了石油化工企业的燕汽计量情况,着重对蒸汽热量计量的合理性进行了分析,阐述了蒸汽热量计量的依据及计算方法,以及蒸气热量计量对节能降耗的重要意义.     

论传统旗袍文化与现代时装

中国的旗袍文化蕴含着非常丰富的文化内涵和设计思想,如今旗袍的普及受到一定的限制,只有经过改良,才可变局限性为可行性,才可使旗袍焕发青春,走向新时代。