城之源把餐饮名店建到繁华商业街

近日,位于北京繁华商业街西单的北京圣聚城大酒店有限公司城之源酒楼获得首都保健营养协会颁发的“营养美食名店”称号。 城之源酒楼是北京房山区琉璃河镇圣聚城大酒店有限公司第三分部。圣聚城大酒店是一家集餐饮、会议、娱乐为一体的三星级酒店。总经理张果是世界烹饪大赛金奖获得者,他根据自己多年经验制作推出的稻草扎肉、飘香脆米鸡、白菜     

一般问题

860464意大利巴兰盖谱(Balangero)露天石棉矿的矿床特征及其开采方法V·Badino等,《Boll.Assoc.Miner.Subalp.》,1984,21(1—2),77—84(英) 该矿主矿体呈扁平状,温石棉平均品位5～6％。目前露天矿深170米,阶段垂直炮孔深13～14米,网距4×4米,炸药单耗50～150克/米~3矿石。矿岩经一台30吨移动式破碎机破碎后用皮带机送到选矿厂。全矿320人,年采矿石300万吨,可回收石棉15万吨,矿山服务年限30年。文中还介绍了石棉矿石选矿和纤维回收工艺。图5、表1、参8。     

一座正在生长的古城

在中国北方,我只见过两座保存完好的古城.一座是山西晋中的平遥古城,一座是河北邯郸的广府古城.两座城几乎处在相同的纬度上,两城直线距离大约250公里.平遥古城在太行山以西,广府古城在太行山以东,两座古城都有雄伟壮丽的方形城墙,保存都很完整.据史料记载,平遥古城始建于西周宣王时期,明朝初年,为防御外族侵扰,始建城墙,城墙总周长6163米,墙高约12米,城内面积约2.25平方公里.广府古城最早记载于春秋时期(当时为土城),成形于隋唐,明代后砌为砖城,城墙周长约4500米,墙高12米,宽8米,城内面积1.5平方公里.     

对长山盐矿压裂采卤工艺初步认识

长山矿区地处四川盆地威远背斜构造西南边缘,铁山背斜北东端之北翼,东为双古背斜,是北东向构造线转为南北向的变化地带。区内产状平缓,地层倾向北西,倾角3—6度。尚未发现断层切割盐岩层。含盐系剖面特征:区内揭露单一岩盐层,呈层状产出,岩盐层最大厚度26.68米,最小厚度8.44米(铁34井除外),一般厚度11—16米。矿体埋深820—1030米,矿石品位氯化钠含量92—95％,产于     

法国Taverny石膏矿锚杆支护和爆破中旋转凿岩设备的最佳配置

法国建筑材料股份有限公司(SAMC)每年为巴黎地区提供120万吨石膏,占公司石膏产量的一大部分。该公司的Taverny矿为地下开采,采用36吨卡车把矿石由Bessancourt处的隧道运出。覆盖层厚为35～80米,矿体厚为9～12米,卡车可在回采工作而直接装载,从而避免了     

石棉工业的科学研究中心

国立全苏石棉工业研究设计院,1950年建立于石棉城——位于世界最大的巴热诺夫石棉矿床地区的国家石棉工业中心。该院的主要研究方向是: 石棉矿床露天采矿工艺的改进; 石棉矿石选矿工艺的改进; 石棉工业新型选矿设备的设计,试验和推广应     

美卓在埃及的卫生纸机车速达到2000米／分

由美卓公司提供的一台Advantage DCT 200TS型卫生纸机安装在埃及10月6日城的Al Sindian造纸厂,由于采用了SymBelt靴式压榨,生产车速达到了2000米／分。     

乌拉尔联合企业石棉厂区的环保

乌拉尔联合企业石棉选矿厂对厂区的环保问题作了研究。认为不论是在工艺操作(矿石干燥、回收石棉粗精矿、石棉精选、排除废石)或在卫生保健方面(从厂房和机运工艺设备、防尘罩排尘)都需要大量的风量,这是石棉矿石分选工艺流程的特点。现代石棉选矿厂所需要的总风量达1000万～1200万米~3/小时。从工艺和吸尘系统排出的风量中的石棉含尘量平     

千年等待 重释神秘 新雅典卫城博物馆

<正>如果说世界上有所谓神秘的建筑,那么有几个能与"神圣之地"古代雅典卫城相媲美呢?承载着世人"千年等一回"的渴望,历经千年风雨,久埋地下的古雅典城随着新卫城博物馆的建成,向公众撩开了神秘的面纱。这座现代博物馆在距离雅典卫城不到400米之处拔地而起,它不仅     

大冶印子粑源远流长

湖北省大冶县境内,有一个地方四周环绕着数座海拔五百至八百八十八米的大山,山貌如城,形成天然裹抱之势,人们叫做裹城。又因为这里地处江南,气候温和,桃、梨、杏、桔、枣、石榴、枇杷等果品很多,又叫“果城里”。这里的印子粑,远近闻名,具有千余年的历史。     

宁夏固原硝口地区岩盐矿地质特征及开采技术方法研究

固原硝口矿区位于固原市原州区,距固原市区2公里左右,面积30.55km2,矿体埋深1000米以下,矿层真厚1.73～40.10m,矿石主要成份为NaCl,平均品位30.59～83.72%。岩盐矿质量较好,单矿层厚度中等,埋藏深度适宜,适合进行钻井水溶法开采。     

基于郧阳明代大丰仓的古今粮仓建设发展探究（网络首发、推荐阅读）

我国古代粮仓文化源远流长,具有库区布局合理、仓房形式多样、储粮工艺精湛等特征,具有极高的历史研究价值。当今社会发展日新月异,我国现代粮仓发展迅速,呈现出现代化、机械化、智能化的发展趋势。以郧阳明代大丰仓这座湖北省保存最完整的古代官储粮仓为例,结合现代粮仓建设的新技术新工艺,从库区选址、总体布局、建筑风格、结构形式、储粮技术等方面进行古今粮仓对比,对于深化郧阳明代大丰仓的历史研究,追溯现代粮仓建设发展历史,丰富我国粮仓文化具有重要意义。     

枇杷花和油菜花蜂粮中微生物的分离与鉴定

以重庆云阳枇杷花和油菜花蜂粮为研究对象,对其发酵过程中的菌种探究。分离蜂粮发酵过程中的微生物,并通过形态学、生理生化鉴定、26S r DNA序列同源性分析和构建系统进化树的方法对分离菌株进行了生物学鉴定,确定其种属。枇杷花中分离的酵母菌菌株与Zygosaccharomyces rouxii strain(KC146358.1)高度同源,确定该菌株为鲁氏酵母Zygosaccharomyces rouxii。并利用形态学及生理生化鉴定方法对枇杷花蜂粮及油菜花蜂粮中的细菌进行分离鉴定,枇杷花蜂粮中分离出5株菌株,其中MRS2、MC1、LB1这3株鉴定为乳酸球菌属Lactococcus lactis subsp.1actis,另外2株MRS1、LB2为肠球菌属Enterococcus durans。油菜花蜂粮中分离出7株菌株,经鉴定其为乳酸杆菌属Lactobacillus,其中菌株MRS3、MC2、LB3、LB4为植物乳杆菌Lactobacillus plantarum;菌株MRS4、MRS5、LB5为鼠李糖乳杆菌Lactobcacillus rhamnosus。这些菌种的分离为云阳地区的蜂粮微生物研究提供了科学内容,为蜂粮产品的开发提供了可供选择的菌株。      

Modeling diffuse phosphorus loads from land to freshwater using the sedimentary record

Diffuse phosphorus (P) loads to a small lake, Friary Lough, in a 1 km2 agricultural subcatchment were quantified over 90 years using a palaeolimnological model. The model assumes that lake total phosphorus (TP) is lost to the sediments and to the lake outflow during periods of steady-state or is also stored within the water column during periods of non-steady-state behavior. Reconstructed TP loads during the 1991-1995 time interval of 2.05-2.53 g m-2 yr-1 are verified by hydrochemical monitoring results from the lake inflow during 1997-1998. This provides evidence for the accuracy of the palaeolomnological model and also that TP loads to the lake can be accounted for from external catchment runoff. An analysis of the TP load data in terms of catchment exports shows that there was a linear rate of increase from ca. 1946 to 1995 of 1.20-1.56 kg km-2 yr-1. The rate of increase is similar to river P load data in the larger 1480 km2 catchment taken over 17 years. The rate of TP increase to the lake is interpreted with regard to current soil P models that propose increasing and threshold soil P concentrations as the cause for increasing diffuse P loss in runoff.     

Forestry practices increase mercury and methyl mercury output from boreal forest catchments

We observed significant increases in the runoff output of total mercury (TotHg) and methyl mercury (MeHg) from a small spruce forest catchment (0.071 km2) after clear-cutting and soil treatment. Here we show that forest regeneration practices may act as an important additional source of TotHg and MeHg to forest lakes. TotHg and MeHg in runoff from two small forested catchments were monitored during the period 1994 to 2001. In the autumn of 1997, one of the catchments was clear-cut Soil preparation (mounding) was carried out in the autumn of 1998 and replanting in the summer of 1999. During the 3 years after the silvicultural treatment, medians of monthly flow-weighted TotHg and MeHg concentrations (12.02 ng L(-1) and 0.35 ng L(-1), respectively) and output loads (0.80-0.97 g km(-2) a(-1) and 0.011-0.036 g km(-2) a(-1), respectively) increased significantly compared to the 3 years calibration period (8.13 ng L(-1) and 0.15 ng 1(-1); 2.0-5.3 g km(-2) a(-1) and 0.11-0.16 g km(-2) a(-1), respectively). These results indicate that clear-cutting and/or soil treatment significantly increases the mobility of TotHg and MeHg accumulated in forest soil and may thus be an important factor for the total input of Hg to boreal freshwater ecosystems.     

Arsenic and manganese contamination of drinking water resources in Cambodia: coincidence of risk areas with low relief topography

Arsenic contamination of groundwater has been identified in Cambodia, where some 100,000 family-based wells are used for drinking water needs. We conducted a comprehensive groundwater survey in the Mekong River floodplain, comprising an area of 3700 km(2) (131 samples, 30 parameters). Seasonal fluctuations were also studied. Arsenic ranged from 1 to 1340 microg L(-1) (average 163 microg L(-1)), with 48% exceeding 10 microg L(-1). Elevated manganese levels (57% >0.4 mg L(-1)) are posing an additional health threat to the 1.2 million people living in this area. With 350 people km(-2) potentially exposed to chronic arsenic poisoning, the magnitude is similar to that of Bangladesh (200 km(-2)). Elevated arsenic levels are sharply restricted to the Bassac and Mekong River banks and the alluvium braided by these rivers (Kandal Province). Arsenic in this province averaged 233 microg L(-1) (median 100 microg L(-1)), while concentrations to the west and east of the rivers were <10 microg L(-1). Arsenic release from Holocene sediments between the rivers is most likely caused by reductive dissolution of metal oxides. Regions exhibiting low and elevated arsenic levels are co-incident with the present low relief topography featuring gently increasing elevation to the west and east of a shallow valley-understood as a relict of pre-Holocene topography. The full georeferenced database of groundwater analysis is provided as Supporting Information.     

Quantification of particle number emission factors for motor vehicles from on-road measurements

The database on particle number emission factors has been very limited to date despite the increasing interest in the effects of human exposure to particles in the submicrometer range. There are also major questions on the comparability of emission factors derived through dynamometer versus on-road studies. Thus, the aims of this study were (1) to quantify vehicle number emission factors in the submicrometer (and also supermicrometer) range for stop-start and free-flowing traffic at about 100 km h(-1) driving conditions through extensive road measurements and (2) to compare the emission factors from the road measurements with those obtained previously from dynamometer studies conducted in Brisbane. For submicrometer particles the average emission factors for Tora Street were estimated at (1.89 +/- 3.40) x 10(13) particles km(-1) (mean +/- standard error; n = 386) for petrol and (7.17 +/- 2.80) x 10(14) particles km(-1) (diesel; n = 196) and for supermicrometer particles at 2.59 x 10(9) particles km(-1) and 1.53 x 10(12) particles km(-1), respectively. The average number emission factors for submicrometer particles estimated for Ipswich Road (stop-start traffic mode) were (2.18 +/- 0.57) x 10(13) particles km(-1) (petrol) and (2.04 +/- 0.24) x 10(14) particles km(-1) (diesel). One implication of the conclusion that emission factors of heavy duty diesel vehicles are over 1 order of magnitude higher than emission factors of petrol-fueled passenger cars is that future control and management strategies should in particular target heavy duty vehicles, as even a moderate decrease in emissions of these vehicles would have a significant impact on lowering atmospheric concentrations of particles. The finding that particle number emissions per vehicle-km are significantly larger for higher speed vehicle operation has an important implication on urban traffic planning and optimization of vehicle speed to lower their impact on airborne pollution. Additionally, statistical analysis showed that neither the measuring method (dynamometer or on-road), nor data origin (Brisbane or elsewhere in the world), is associated with a statistically significant difference between the average values of emission factors for diesel, petrol, and vehicle fleet mix. However, statistical analyses of the effect of fuel showed that the mean values of emission factors for petrol and diesel are different at a 5% significance level.     

On-road measurement of particle emission in the exhaust plume of a diesel passenger car

Particle size distributions were measured under real world dilution conditions in the exhaust plume of a diesel passenger car closely followed by a mobile laboratory on a high speed test track. Under carefully controlled conditions the exhaust plume was continuously sampled and analyzed inside the mobile laboratory. Exhaust particle size distribution data were recorded together with exhaust gas concentrations, i.e., CO, CO2, and NO(x), and compared to data obtained from the same vehicle tested on a chassis dynamometer. Good agreement was found for the soot mode particles which occurred at a geometric mean diameter of approximately 50 nm and a total particle emission rate of 10(14) particles km(-1). Using 350 ppm high sulfur fuel and the standard oxidation catalyst a bimodal size distribution with a nucleation mode at 10 nm was observed at car velocities of 100 km h(-1) and 120 km h(-1), respectively. Nucleation mode particles were only present if high sulfur fuel was used with the oxidation catalyst installed. This is in agreement with prior work that these particles are of semivolatile nature and originate from the nucleation of sulfates formed inside the catalyst. Temporal effects of the occurrence of nucleation mode particles during steady-state cruising and the dynamical behavior during acceleration and deceleration were investigated.     

On-road particulate matter (PM2.5 and PM10) emissions in the Sepulveda Tunnel, Los Angeles, California

Total and speciated particulate matter (PM2.5 and PM10) emission factors from in-use vehicles were measured for a mixed light- (97.4% LD) and heavy-duty fleet (2.6% HD) in the Sepulveda Tunnel, Los Angeles, CA. Seventeen 1-h test runs were performed between July 23, 1996, and July 27, 1996. Emission factors were calculated from mass concentration measurements taken at the tunnel entrance and exit, the volume of airflow through the tunnel, and the number of vehicles passing through the 582 m long tunnel. For the mixed LD and HD fleet, PM2.5 emission factors in the Sepulveda Tunnel ranged from 0.016 (+/-0.007) to 0.115 (+/-0.019) g/vehicle-km traveled with an average of 0.052 (+/-0.027) g/vehicle.km. PM10 emission factors ranged from 0.030 (+/-0.009) to 0.131 (+/-0.024) g/vehicle. km with an average of 0.069 (+/-0.030) g/vehicle.km. The PM2.5 emission factor was approximately 74% of the PM10 factor. Speciated emission rates and chemical profiles for use in receptor modeling were also developed. PM2.5 was dominated by organic carbon (OC) (31.0 +/- 19.5%) and elemental carbon (EC) (48.5 +/- 20.5%) that together account for 79% (+/-24%) of the total emissions. Crustal elements (Fe, Mg, Al, Si, Ca, and Mn) contribute approximately 7.8%, and the ions Cl-, NO3-, NH3+, SO4(2-), and K+ together constitute another 9.8%. In the PM10 size fraction the particulate emissions were also dominated by OC (31 +/- 12%) and EC (35 +/- 13%). The third most prominent species was Fe (18.5 +/- 9.0%), which is greater than would be expected from purely geological sources. Other geological components (Mg, Al, Si, K, Ca, and Mn) accounted for an additional 12.6%. PM10 emission factors showed some dependence on vehicle speed, whereas PM2.5 did not. For test runs in which the average vehicle speed was 42.6 km/h a 1.7 times increase in PM10 emission factor was observed compared to those runs with an average vehicle speed of 72.6 km/h. Speciated emissions were similar. However, there is significantly greater mass attributable to geological material in the PM10, indicative of an increased contribution from resuspended road dust. The PM2.5 shows relatively good correlation with NOx emissions, which indicates that even at the low percent of HD vehicles, which emit significantly more NOx than LD vehicles, they may also have a significant impact on the PM2.5 levels.     

Diffuse and point sources of silica in the Seine River watershed

Dissolved silica (DSi) is believed to enter aquatic ecosystems primarily through diffuse sources by weathering. Point sources have generally been considered negligible, although recent reports of DSi inputs from domestic and industrial sources suggest otherwise. In addition, particulate amorphous silica (ASi) inputs from terrestrial ecosystems during soil erosion and in vegetation can dissolve and also be a significant source of DSi. We quantify here both point and diffuse sources of DSi and particulate ASi to the Seine River watershed. The total per capita point source inputs of Si (DSi + ASi) were found to be 1.0 and 0.8 g Si inhabitant(-1) d(-1) in raw and treated waters of the Achères wastewater treatment plant, in agreement with calculations based on average food intake and silica-containing washing products consumption. A mass balance of Si inputs and outputs for the Seine drainage network was established for wet and dry hydrological conditions (2001 and 2003, respectively). Diffuse sources of Si are of 1775 kg Si km(-2) y(-1) in wet conditions and 762 kg Si km(-2) y(-1) in dry conditions, with the proportion of ASi around 6%. Point sources of Si from urban discharge can contribute to more than 8% of the total Si inputs at the basin scale in hydrologically dry years. An in-stream retention of 6% of total inputs in dry conditions and 12% in wet conditions is inferred from the budget.