Hydrothermal synthesis of silver nanoparticles in Arabic gum aqueous solutions

Finely divided silver nanoparticles were synthesized via the hydrothermal method. Arabic gum （AG） was used as both the reductant and steric stabilizer without any other surfactant. By adjusting the reaction temperature, mass ratio of AG to AgNO3, and reaction time, silver nanoparticles with different morphological characteristics could be obtained. The products were characterized by UV-Vis, FTIR, TEM, SEM, and XRD measurements. It was found that temperature and AG played an important role in the synthesis of mono-disperse silver nanoparticles. Well dispersed and quasispherical silver nanoparticles were obtained under the optimal synthesis conditions of 10 mmol/L AgNO3, m（AG）/m（AgN03）= l：1, 160 ℃ and 3 h.

三五一○工厂一水多用成效显著

三五一○工厂系总后所属大型针织厂家,主要担负军队针织内衣、缝线、弹力袜及部分外贸产品生产.自87年以来,年计划工业用水逐年增多,由87年的196.2万吨上升到88年218.7万吨,89年达到258.3万吨,年平均递增达15%以上,仅此一项耗资24万元.

公正吗?

“应依罪量刑。” 全国性和地方性报纸经常刊登一些精心选择的案件报道。这些案件的共同特点是:对犯罪者的惩处通常与其所犯罪行不符。我们很容易读到一段关于刑事案件的描写,并为法官的裁决而感到愤愤不平。但是,我们必须记住,这短短的一段文字却概述了一个复杂的案子——它可能花费法官们数小时、几天甚至几个星期的时间。法官们对案情的了解比我们这些漫不经心的读者要详尽得多。然而就同一个案子来说,不同法庭的裁决结果也许会千差万别。正如每一个足球迷所知道的,裁判也会出差错,并且更易被误解,特别是判决结果对本队不利的时候。

失落的水神

在我国的神话系统中,水神是影响最悠远的神祗。江河湖海,甚至水井水潭,皆有司职不同的水神。张籍《江南春》:"向晚青山下,谁家祭水神。"

In vitro Drug Sensitivity of Eperythrozoon from Mink

[Objective] This study aimed to test the sensitivity of Eperythrozoon from mink to various drugs in vitro. [Method] The red blood cells isolated from Eperythro- zoon positive mink was cultured in complete medium （70% RPMI-1640 medium and 30% calf serum）, supplemented with bernier, oxytetracycline, trichlorfon, tylosin, imi- docarb, florfenicol, Fuhongjuesha or primaquine phosphate at the working concentra- tions of 12, 24, 36, 48 and 96 μL/ml, incubated at 37.3 ℃, 5% CO2. [Result] Fuhongjuesha was most efficient for killing Eperythrozoon, followed by trichiorfon and primaquine phosphate, but trichlorfon is toxic. Bernier, imidocarb and florfenicol are efficient. [Conclusion] The study provides a scientific reference for clinical treatment of eperythrozoonosis.

酵母醇脱氢酶在双水相系统中的亲和分配行为

将均三嗪型活性染料—活性嫩黄M—7G共价偶于聚乙二醇(PEG6000)分子上,构建双水相系统,能使醇母脱氢酶(以下简称ADH)分配系数增值11倍。观察了影响ADH分配系数的各种因素,设计了借液—液萃取方式快速部分纯化ADN的方案,经部分纯化后,ADH的比活力按每毫克制剂含单位数计算提高至700倍;按每毫克蛋白质含单位数计算提高至16倍,酶活力回收率可达86％。

Price and retailer's service level decision in a supply chain under consumer returns

To investigate the optimal retail price and service level in a supply chain under consumer returns, a consumer returns model under the retailer＇s service provision is built. The optimal decision results and optimal profits are obtained in the vertical integration game and the manufacturer Stackelberg game, respectively. Through comparing the optimal profits with service provision with those of no service provision, the boundary conditions that the retailer＇s service should be provided are derived. The results show that in the manufacturer Stackelberg game, the optimal profit of the retailer and the manufacturer with service is always superior to that of a no service provision. However, in the vertical integration game, the supply chain can only benefit from the service under certain conditions. Finally, through numerical examples, the impacts of the cost for providing services and the consumer return rate on the optimal decisions are analyzed.

Coupled 2D Hydrodynamic and Sediment Transport Modeling of Megaflood due to Glacier Dam-break in Altai Mountains,Southern Siberia

One of the largest known megafloods on earth resulted from a glacier dam-break,which occurred during the Late Quaternary in the Altai Mountains in Southern Siberia.Computational modeling is one of the viable approaches to enhancing the understanding of the flood events.The computational domain of this flood is over 9460 km2 and about 3.784 × 106 cells are involved as a 50 m × 50 m mesh is used,which necessitates a computationally efficient model.Here the Open MP(Open Multiprocessing) technique is adopted to parallelize the code of a coupled 2D hydrodynamic and sediment transport model.It is shown that the computational efficiency is enhanced by over 80% due to the parallelization.The floods over both fixed and mobile beds are well reproduced with specified discharge hydrographs at the dam site.Qualitatively,backwater effects during the flood are resolved at the bifurcation between the Chuja and Katun rivers.Quantitatively,the computed maximum stage and thalweg are physically consistent with the field data of the bars and deposits.The effects of sediment transport and morphological evolution on the flood are considerable.Sensitivity analyses indicate that the impact of the peak discharge is significant,whilst those of the Manningroughness,medium sediment size and shape of the inlet discharge hydrograph are marginal.

Basic formation mechanisms of Lake Doroninskoye soda water, East Siberia, Russia

The primary scientific goal of studying salt lakes is to better understand the formation of small continental- type hydrogeochemical systems. Many scientists have attributed the metamorphism of the chemical composition of salt lakes to the evaporative concentration of water. How- ever, the formation of soda water is inconsistent with this hypothesis. Thus, analyzing intrabasinal biochemical pro- cesses and water--rocks interactions during the evaporative concentration of water allows us to understand the major mechanisms of the formation and evolution of water com- positions. Therefore, the aim of this paper is to identify the key processes involved in the formation of the chemical composition of the water in Lake Doroninskoye. An analysis of the distribution of major components shows that Na＋, HCO3-, CO32-, and C1- are dominant in this water. High concentrations of these elements are the result of evaporative water concentration. Calcium, magnesium, and potassium are not accumulated because the water is saturated in min- erals containing these elements. The main barrier to the growth of the sulfate content of water is sulfate reduction. This process also contributes to the additional reproduction of carbon dioxide, which reacts with the products of the hydrolysis of aluminosilicates OH- to form HCO3- and CO32-, thus further contributing to the natural processes of soda formation.

Absorption and Recurrence Spectra of Nonhydrogenic Rydberg Atom Near a Metal Surface

Multielectron to theoretical treatments atoms near a metal surface are essentially more complicated than hydrogen atom with regard By using the semicalssical dosed orbit theory generalized to the multielecton atoms, we study the dynamical properties of the Rydberg lithium atom near a metal surface. The photoabsorption spectra and recurrence spectra of this system have also been calculated. Considering the effect of the ionic core potential of the Rydberg lithium atom, the number of the closed orbits increases, which leads to more peaks in the recurrence spectra than the case of hydrogen atom near a metal surface. This result shows that the core-scattered effects play an important role in nonhydrogenic atoms. This study is a new application of the closed-orbit theory and is of potential experimental interest.

Optimal Groundwater Irrigation Allocation of Al-Wajid Aquifer in the Kingdom of Saudi Arabia

Groundwater is the primary water source in the Kingdom of Saudi Arabia. As result of lack of basic knowledge on irrigation practices, massive abstractions of groundwater occurred in 1980＇s. A Decision Support Linear Goal Programming （LGP） model was developed to determine optimal groundwater irrigation levels, to assess the implications for water management policies, and to estimate welfare impact on producer surplus. Due to the reductions of groundwater in 1980＇s, the Al-Wajid aquifer water levels have dropped in agricultural areas by more than 200 m. Results from this study estimate that the total groundwater of the Al-Wajid aquifer that can be saved is equal to 66 MCM for the first scenario, 147 MCM for the second scenario, and 229 MCM for the third scenario. Regarding the welfare analysis impacts, it is clear that the total gross margin is decreasing up to 7.7% at the end of the year of scenario Ⅲ. Therefore, the third scenario with a water saving increase to 18.1% is recommended as a directive for agricultural policy formation in the future.

Relationship between Diabetes Mellitus and Food Balance in the Kingdom of Saudi Arabia

The present explanatory study was carried out to investigate the relation between diabetes mellitus and food balance in the Kingdom of Saudi Arabia during 2005-2010, using published data. This study was conducted to investigate the relationship between food balance and diabetes mellitus, using published data on food balances in the Kingdom of Saudi Arabia during 2005-2007, published by the Ministry of Agriculture in 2012 and Medical Technical papers and Scientific Reports published on Diabetes Mellitus in Saudi Arabia in an explanatory study. Food balance was calculated per capita and then its level of change was compared with changing of diabetes mellitus in the country. Results illustrated that Saudi citizen daily protein consumption （DPC） during 2005-2007 （g/capita/day） is higher than the average global consumption level of protein with 15.27%, daily fat consumption （DFC） with 24.56% and daily energy consumption （DEC） with 16.93% and increases than recommended level by International Nutrition Organizations （INO） with 56% for protein, 60.49% for fat and 27.37% for energy. On the other hand, DPC per capita in Saudi Arabia decreased during the period 2008-2010 from 88.3 g/day to 82.36 g/day. Moreover, DFC per capita in Saudi Arabia decreased during the period 2008-2010 from 3,247.90 Cal/capita/day to 3,176.43 Cal/capita/day, and daily energy consumption （DEC） of Saudi citizen increases than world consumption with 16.93%, while increases with 27.37% than INO. Despite this, DPC, DFC and DEC per capita in Saudi Arabia were still higher than world mean. On the other side, results illustrated that the number of diabetic patients in Saudi Arabia during the same period （2005-2010）. The curve of diabetic patient＇s number in Saudi Arabia during 2005-2010 is regular ascending with increasing level ranged between 7.10% in 2005 and 12.44% in 2010. It is essential to devise Saudi National Programme to educate the public about the relation of food balances and diabetes, so it could be avoided, and provide citizens with healthy dietary balances tables.

Morphotaxonomy and seasonal distribution of planktonic and benthic Prorocentrales in Karachi waters,Pakistan Northern Arabian Sea

Morphotaxonomy and seasonal abundance of dinoflagellates of the genera Prorocentrum and Mesoporos （Prorocentrales） were studied from nutrient-rich waters, Karachi Harbor and the mouth of the Manora Channel, Pakistan during May 2002-July 2003. Using both light and scanning electron microscopy, 13 species of Prorocentrales were identified according to cell shape, size, ornamentation of thecal plates, and architecture of apical platelets, apical pore area, marginal pores, and intercalary bands. P. sigmoides, P. arcuatum, P. scutellum, P. donghaiense, P. balticum, P. minimum, P. emarginatum, P. lima, P. faustiae, and Mesoporos perforatus constitute new records for sindh coast of Pakistan. The most abundant species were P. minimum/P, balticum （4.5x103 cells/L）, P. micans （1.1~103 cells/L）, P. gracile/P, sigmoides （2.5 x 102 cells/L） and P. donghaiense （6.6 x 103 cells/L） at temperatures of 29-31 ~C and salinities of 35-40. Maximum abundance was observed in winter and lower abundance in summer. There was no significant change in the distribution of species between stations except for the benthic species which occurred close to Karachi Harbor waters. Significant positive correlations were observed between Prorocentrum spp. and temperature （R2=0.27） and negative correlations with salinity （R2=-0.32） except for P. minimum and P. emarginatum which has negative correlation with temperature （R2=-0.24） and positive with salinity （R2=0.08, 0.19）. The finding of potential okadaic-acid producing species of benthic Prorocentrum call for monitoring for possible human health problems in this region.

Potential Impacts of Climate Change on Water and Public Health in Alberta, Canada

A warming climate may affect the well-being through impacts on health and sustainability of its natural resources. Climate change, population growth, and agricultural and industrial development are increasing demand and pressure on Alberta＇s water supplies, and the risk to the health and well-being of Albertanso its economy and its aquatic ecosystems. An analytic framework was developed to help determine the adaptive capacity of the public health sector and its ability to cope with changes in climate and water quality and quantity. The framework includes possibilities for changes in public health processes, management, inputs, outputs, structure, financing, institutions, and policies. Research gaps and priorities related to impacts on the health sector from changed conditions of climate and water supply are offered.

Cost of Dams in AI-Baha Province, Kingdom of Saudi Arabia

The purposes and the types of dams are reviewed in AI-Baha province, on the western south of KSA （Kingdom of Saudi Arabia）. Data are collected and tabulated ascending according to the capacity of storing water. The cost （in Saudi Riyal） is plotted versus the capacity （in m3） for the dams. Then a linear regression analysis is done employing Micro Software Excel. An equation is obtained to predict the cost of dams with storage capacities less than or equal 500,000 m3, where the type of dam has no effect on the cost. Taking into consideration the inflation rates along the time, the 2013＇s costs are estimated and also another equation is obtained to predict the cost.

Devising an Organized Procedure for Effective Risk Management in Independent Water and Power Plant Projects in Saudi Arabia

Worldwide countries are striving to meet demands for water and power, which have been estimated as likely to increase at a rate of 7% per annum over the coming decade. Water and power plant projects following the IWPP （independent water and power plant） approach have typically involved a plethora of risks. Since about 75% of the IWPP projects in SA （Sandi Arabia） have failed to meet specified objectives, effective RM （risk management） implementation is key to the success of any public and private project. Practitioners have related their experience about RM in IWPP projects in SA through semi-structured interviews, and analyzed these through the grounded theory approach to identify the elements leading to ineffectiveness when implementing RM in IWPP projects in SA. This study gathers and collates data to present findings in a propositional diagram that is fully grounded, based on practitioners＇ experiences that extend to the ineffectiveness of implementing RM in water and power projects, specifically in IWPP projects in SA. Findings indicate that IWPP parties have implemented RM in an informal way. In addition, there is a general lack of RM knowledge in the SA water and power industry. The paper concludes with an emergent diagram illustrating major phenomena, categories and subcategories affecting the implementation of RM in IWPP projects in SA.

Seasonal and Spatial Variation in the Monitoring Parameters of Zomar Stream, Palestine during 2010

Levels of pollutants at Zomar stream, the only recreational area for the inhabitants of the northern part of the West Bank, Palestine, were recently determined, and have shown to be relatively high. Three bathing sites along the Zomar stream area were monitored for one year （fortnightly）. Wastewater samples were subjected to microbiological analysis （fecal coliforms, Escherichia coli, Pseudomonas, Enterococcus and Klebsiella）, physico-chemical analyses （water temperature, pH, electroconductivity and DO （dissolved oxygen））, biochemical oxygen demand, total Kjeldahl nitrogen and ammonia. The study results demonstrated seasonal and locational variations in all parameters studied. The highest levels of pollution were detected during summer, especially before a rainfall or after a discharge from onsite cesspits. Locations associated with sewage discharge were found to have the highest fecal indicator levels.

Monitoring Trace Metals in Some Cultured Freshwater Fish Species in Saudi Arabia

Three species of freshwater fishes, Oreochromis niloticus, Clarias lazera and Cyprinus carpio, were collected in marketing size from some fish farms in Al-Kharj region, Riyadh area, Saudi Arabia and examined throughout the year 2012 for the following trace metals contents： chromium （Cr）, lead （Pb）, cobalt （Co）, nickel （Ni）, copper （Cu）, zinc （Zn）, iron （Fe） and cadmium （Cd）. The results showed no detection of Cd in all examined species, however, the mean values of other tested metals were within the standard permissible levels except for Pb which showed higher mean levels ranged from 2.05 ± 0.65 mg/kg to 5.30 ± 0.60 mg/kg in O. niloticus, 0.15 ± 0.13 mg/kg to 6.40 ± 0.10 mg/kg in C. lazera and 1.7 ± 0.20 mg/kg in C. carpio compared to the maximum permissible limits recorded by Saudi Arabia Standards Organization （SASO） for fish and shellfish. Consequently, from the public health point of view, efficient routine examination of cultured fishes to control trace metals during culture processes and before marketing is recommended.

The Contrary Effect of Collaborative Writing on ESL Students＇ Vocabulary Acquisition

Writing task is an integral part of education in ESL （English as a Second Language） at the foundation level. It has been observed that foundation level 3 students of Arab Open University have an insufficient knowledge of vocabulary which is reflected on their writing, as their usage of vocabulary is confined to a number of limited common words. This research explores the effect of collaborative writing on students＇ vocabulary acquisition. All the writing tasks were related to educational topics in order to provide students with the lexical items related to the same subject. This study took place in one of the foundation level 3 classes at Arab Open University, Oman branch. Fourteen anonymous Arab students for whom English is considered as the second language participated in this study. All students are in the intermediate level of English language proficiency. For each writing task, five collocations were selected to be taught in the class over a period of five weeks. The achieved outcomes revealed contrary results to the previous studies that had shown the effective impact of collaborative writing. This study has discussed the contrary impact of collaborative writing on improving the learners＇ vocabulary acquisition in addition to the challenges students faced during collaborative writing task. Finally, this research provides recommendations for the effective collaborative writing in the foundation students＇ language proficiency.

Floodplain Hazard Mitigations, Solutions and Recommendations for Wadi Asia in Jeddah-Saudi Arabia

No simple solution to flood prevention is accessible. This research provides a brief summary of the hydrologic and hydraulic methodology that can be used to develop specific details that integrated the flood information tool. It permits rapid analysis of a wide variety of stream discharge data and topographic mapping to avoid the flood hazard over entire floodplain boundaries. This paper focuses on the water floodplain hazard in Wadi Asla-Jaddah-Saudi Arabia. The most common type of rainfall in the study area is that accompanied by thunderstorms, which usually fall during the winter season as well as in the spring. The primarily evaluation of this problem and the solution is contemplate. The more essential and ＂doable＂ elements of a solutions and recommendations are discussed in this research.