Kinetic effect of carbonic anhydrase enzyme on the carbonation reaction of lime mortar

The effect of carbonic anhydrase enzyme on the precipitation kinetics and phase transformations of calcium carbonate, and on the strength development of lime mortars has been investigated with saturated lime solutions, lime pastes and lime mortars under atmospheric conditions. The results clearly show that carbonic anhydrase catalyzes the reaction between carbon dioxide and aqueous lime, and increases the rate of calcium carbonate crystallization, the yield of the carbonation reaction and mortar strength at early ages. This is most likely a kinetic effect associated with the increased rate of carbonate ions supply to the solution by the enzyme. In addition, this enzyme favors the formation of stable calcite and significantly modifies its morphology by developing new crystal faces. These results suggest a novel approach for accelerating the hardening of lime mortars using carbonic anhydrase enzyme, which may offer a potentially novel approach with significant benefits on the applications of lime mortars in architectural heritage conservation as well as in construction.     

History and Characteristics of Construction Techniques Used in Traditional Timber Ottoman Houses

The aim of this article is to make a comprehensive review of the traditional timber house constructions in Turkey, which constitutes the majority of the existing Ottoman architectural legacy. After a short historical background focused on the Ottoman territory, the first section explores regional differences in the housing tradition, developed according to local features and defined by architectural features, material characteristics, and availability of materials. Derived from these regional differences, in the second section diversity in traditional timber construction systems in Turkey is described with special emphasis on the Ottoman h?m?? system. In this part, besides the discussion of the h?m?? technique which spread over Ottoman lands from the Balkans to Syria, the timber masonry and frame systems of the Eastern Black Sea Region and Thrace are presented in detail with visual support.     

Decay of Limestone Statues at Mount Nemrut (Adiyaman,Turkey)

Mount Nemrut is a 2,206 m high mountain located in Adiyaman, Turkey. A number of monumental statues, a 50-m high tumulus, and a lion horoscope were constructed at the top of the mountain by King Antiochos I (69–36 bc) of the Commagene Kingdom. The site was included in the UNESCO World Heritage List in 1987 due to its unique character. However, the limestone statues located on both the east and the west terraces of the site are getting deteriorated. This study investigates the weathering of the limestone at Mount Nemrut based on field and laboratory studies. It is found that the dissolution occurs along microcracks developed in the limestone during geological time. It is more pronounced in the east terrace where freezing-thawing cycles are more than the west terrace. Furthermore, dissolution is more effective for the faces of the statues exposed to direct atmospheric contact. Due to harsh atmospheric conditions with dominant wetting-drying and freezing-thawing processes at the site, it is recommended that direct rain and snow contact with the statues should be minimized.     

Political Power and Policy Design: Why Are Policy Alternatives Constrained?

Little research examines the stage of the policy process during which policy alternatives are formulated. Using quantitative and qualitative data from Swedish local politics, we address this deficiency by analyzing the process by which the number of specific policy alternatives is reduced. The findings suggest that, in approximately 20 percent of issues, more than one alternative will reach all politicians making the binding decisions. Most local politicians, in both the majority and opposition factions, think that they lack sufficient information on alternative policy designs. We also find a “political bias,” that is, alternatives are discarded at an early stage because they are deemed not politically feasible. Politicians outside the inner circles, especially those with higher education, would like to see more policy alternatives to discuss and from which they can make choices.     

Structural Change,the Social Policy Environment and Female Employment in Turkey

Since the 1970s, a series of demand and supply related changes have led to significant labour market transformations which have brought about a sustained increase in female employment throughout the world. While similar transformations have also been underway in Turkey, the country appears to be one of the rare exceptions to worldwide trends. During the last two decades both female labour force participation and female employment rates have declined at national level. In this article, two sets of questions are posed to explore the factors likely to influence female labour force participation. One set of questions pertains to the society‐specific dynamics of structural change in employment patterns in Turkey, with particular reference to the level and composition of employment in the service sector. A second set of questions is posed to examine labour market relations and the social policy environment in Turkey, and their impact on the demand for and supply of female labour. Current changes in the prevailing policy environment are considered to highlight a certain contradiction in the attitudes of decision makers who seem to be faced with a trade‐off between continuing adherence to conservative patriarchal values and the objectives of increasing labour force participation and combating poverty.     

唐代“六胡州”州城的建置及其运用——“降户”的安置和役使的一个类型

唐朝在突厥降户中贾胡的处理上采取把他们安置在适合生活的地方,并对之进行驱使的办法。这典型的表现在"六胡州"州城的建置及其运用之上。六胡州设于"河曲"之地的中西部一带,介于六州中的灵州、夏州之间,是指鲁、丽、塞、含、依、契等六小州。在突厥降户中,主要是贾胡降户被集体安置在这些州城之内。这些州城位于今内蒙古自治区河套地区的最南段一带,以及长城以北较为狭窄的地区,属于北方著名的湖泽地区,利于养马。六胡州民之所以主要由贾胡降户来组成,是因为他们具有养马等技术特长。他们在六胡州的州城内受到统治,并受驱使从事养马的工作。六胡州在高宗调露元年建置,这时唐朝正好遭遇养马大量丧失的危机,这是建置六胡州的重要原因。此外,六胡州因"以唐人为刺史",而不称羁縻州。六胡州民居于州城内的"坊"里。他们不一定都一直活动在州城之内,但应"编籍"在州城中一定区域的名称之下。     

Trajectories for Greening in China: Theory and Practice

This edited volume argues that China's development poses the greatest ever environmental challenge for the modern world in terms of speed, size and scarcity. The volume is organized around the greening of the Chinese state and society: can the inclusion of sustainable development principles into governance, management and daily practices by social actors lead to sustainable development per se? This introduction sketches the different scholarly camps around greening and sustainable development, ranging from sceptical to radical environmentalism. The contributions demonstrate that China is showing clear signs of greening as new institutions and regulations are created, environmental awareness increases and green technologies are implemented. However, the question remains whether this is sufficient to effectuate long‐term sustainable development. The key factors here are the sheer speed of China's economic growth, the size of its population, and the relative scarcity of its natural and mineral resources. Chinese development presents compelling reasons for rethinking the viability of greening. It is necessary to move beyond both alarmist visions of an environmental doomsday, and optimistic notions that incremental changes in technology, institutions and lifestyles are sufficient for sustainability. It might be more fruitful — and not only for China — to consider ‘precautionary’ rather than ‘absolute’ limits to growth.     

Biotechnology and Food Safety in China: Consumers’ Acceptance or Resistance?

Although China is one of the world's largest producers and consumers of genetically modified (GM) crops and derived food products, little is known about the level of Chinese consumer awareness, understanding and acceptance of GM food. Initially, China pursued relatively aggressive policies for biotechnology development, but in recent years, the central government has become more sensitive to the potential environmental risks of transgenic food crops. To protect domestic biotech industries, the state plays a critical role in the politics of biotechnology, and does not allow GM food to become a prominent public issue. This contribution reports on a survey of 1,000 urban respondents. It demonstrates that most consumers lack the most basic understanding of biotechnology and its potential risks. The majority of the respondents (60 per cent) were either unwilling to consume GM food or were neutral about the idea, but when given neutrally‐worded information about potential GM food allergenicity, the willingness to buy dropped sharply. This might point to future scenarios of consumer resistance against GM food as has happened in European Union member states. This effect demonstrates the malleability of the Chinese consumer in a context of limited understanding and inadequate access to information.