up a math

ic model for delivery center to distribute addresses and to select certain route to deliver the contents. Meanwhile, optimizing way of calculation is presented for this problem and the efficiency is proved with practical examples.Calculation;Delivery Route;Transmission0长春理工大学学报Journal of Changchun Institute of Optics and Fine Me     

a sking suit

MONCLER GAMME BLEU by THOM BROWNE首个系列登场．时装人热切期待。以MONCLER著名的滑雪装及羽绒服．融合THOM BROWNE最拿手的修身剪裁西装设计．将户外风格与传统西装以另一创新角度展示出来，可称之为本季度最美系列之一．连日本伊势丹潮流百货也率先引入首季系列．可见MONCLER GAMME BLEU by THOM BROWNE首季绝强的人气度。     

Natamycin: a natural preservative for food applications—a review

Food Science and Biotechnology - Natamycin is a natural antimicrobial peptide produced by the strains of Streptomyces natalensis. It effectively acts as an antifungal preservative on various food...     

─a case reportXI

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Assessment of Energy Consumption in a Meat-Processing Plant—a Case Study

Meat-processing plants have their specific characteristics due to quantity of raw materials processed, production technology, degree of mechanisation of production and space utilization. These characteristics affect variability in consumption of energy carriers. This paper presents a case study of energy consumption in a small meat processing plant. It is attempting to identify and evaluate key factors which may be useful in conducting an in-depth analysis of energy consumption in the meat industry, and so this analysis may be important in selecting the best production techniques available. The results of the analysis are of critical importance for the selection of production technology selection assuming high plant efficiency.     

R134a、R600a环保型制冷剂的特性探讨

R134a、R600a作为绿色环保型制冷剂越来越被广泛使用,对R134a、R600a特性进行探讨,并通过对二者的特性比较总结出各自的优缺点,了解这些新型制冷剂的特性,从而根据相应的特点选择合适的制冷剂并对相应的制冷系统进行改进,使之符合其维修工艺要求,真正做到绿色环保。     

Do cows prefer a barn compartment with a grooved or slotted floor?

Cow preferences for one of two compartments with different floors were tested in a barn with two symmetrical, connected compartments, each intended for 16 cows. Compartments were identical except for the floor. One floor was grooved longitudinally to the feeding barrier and the other was slotted perpendicular to that barrier. Sixteen pregnant, lactating Holstein-Friesian cows were used. After 14 d of habituation, cow behavior was videotaped for 10 full 24-h d, spread over 22 d. Their daily time budget spent on different activities performed in both compartments was analyzed, as was their relocation and use of the concentrate dispenser in each compartment. On average, cows spent 120 min longer per day in the slotted floor compartment than in the grooved floor compartment, and performed all activities in the daily time budget significantly longer in this compartment. However, testing the preference of individuals revealed that, although five cows significantly preferred the slotted floor compartment, two cows significantly preferred the other compartment, and nine cows had no preference. On the slotted floor, cows ate longer at the feeding barrier and more often drank front-on to the water trough; on the grooved floor they more often drank standing parallel to the water trough. Thus, they seemed to prefer to stand parallel to the slots. Relocation of cows, indicated by index of movement, was not significantly different between the floors. Relocation seemed to be stimulated more by the presence of concentrate dispensers in both compartments than by floor profile. Although one floor type was not clearly preferred over the other, the findings and methods of this study have implications for design and implementation of future preference tests for testing husbandry systems and their components.     

Characterisation of a β-N-acetylhexosaminidase from a commercial papaya latex preparation

A β-N-acetylhexosaminidase (β-NAHA) (EC 3.2.1.52) with molecular mass of 64.1 kDa and isoelectric point of 5.5 was purified from a commercial papaya latex preparation. The optimum pH for p-nitrophenyl-N-acetyl-β-d-glucosaminide (pNP-β-GlcNAc) hydrolysis was five; the optimum temperature was 50 °C; the K_m was 0.18 mM, V_max was 37.6 μmol min⁻¹ mg⁻¹ and activation energy (E_a) was 10.3 kcal/mol. The enzyme was thermally stable after holding at 30–45 °C for 40 min, but its activity decreased significantly when the temperature exceeded 50 °C. Heavy metal ions, Ag⁺ and Hg²⁺, at a concentration of 0.25 mM and Zn²⁺ and Cu²⁺, at a concentration of 0.5 mM, significantly inhibited enzyme activity. The β-NAHA had only one active site for binding both pNP-β-GlcNAc and p-nitrophenyl-N-acetyl-β-d-galactosaminide (pNP-β-GalNAc). A prototropic group with pKa value of about five on the enzyme may be involved in substrate binding and transformation, as examined by Dixon–Webb plots.     

Adsorption of rutin onto a food-grade styrene–divinylbenzene copolymer in a model system

Adsorption of quercetin-3-O-rutinoside (rutin) onto Amberlite^® XAD 16HP was studied applying a modified D-optimal design. Temperature, pH value, rutin concentration and resin amount were studied as independent factors determining rutin adsorption. Using the mathematical model resulting from the analysis of the D-optimal design the optimal conditions for rutin adsorption onto the styrene–divinylbenzene copolymer were determined. Furthermore, the model equation was successfully applied to calculate the Langmuir and Freundlich isotherm parameters of this particular solute–sorbent system. In addition, the data obtained from the D-optimal design allowed the calculation of ΔG, ΔH and ΔS for the adsorption process. The results presented in this study are of utmost importance for a better understanding of adsorption phenomena. The more detailed knowledge of such sorbent systems is required to improve the cost-effectiveness of industrial processes for the recovery of secondary plant metabolites, such as polyphenols, based on resin adsorption technology.     

Relationship between chlorophyll a and β-carotene in a lipid-containing model system during illumination

The relationship between chlorophyll a (Chl a) and β-carotene during illumination in the presence of fatty acid esters, methyl stearate methyl oleate and methyl linoleate was studied. Mixtures of Chl a, β-carotene and fatty acid esters were exposed to a 40 w light for 3 h. Isomerization and degradation reations of Chl a and β-carotene were monitored using HPLC with diode array detection Three isomers of Chl a and four cis isomers of β-carotene were separated and detected. Both the degradations of total amount of Chl a and β-carotene fit the first-order model. The degradation rate of total amount of β-carotene was highest in methyl stearate, followed by in methyl oleate and in methyl linoleate, while a reverse order was observed for the degradation rate of total amount of Chl a. In the presence of three fatty acid esters, Chl a is more susceptible to isomerization and degradation than β-carotene, and the degradation rates for both Chl a and β-carotene are significantly different (p < 0.05).     

评SAEJ661a摩擦材料试验程序和SAEJ866a评级方法

文中提出目前由10几个国家采用的 SAE(美国汽车工程师学会)推荐的摩擦材料试验程序,不能试验真实的制动效能,并对 SAEJ661a 摩擦材料试验程序和 SAEJ866a 评级方法进行了评述。     

叶绿素a分光光度法测定探讨

本文从叶绿素a的采样和分析角度验证该的精密度、准确度和检出限,在验证方法满足验证条件后,实施采样分析,并从不同滤膜、不同研磨方式对监测结果的影响进行研究,得出叶绿素a最佳的实验条件。     

Guitang (Group) Announced to Build a 15,000 t/a Paper Production Line

On January 6th, 2013, the 60,000 t/a household paper project of Zijinghua Paper Co., Ltd. was approved by Development and Reform Commission of Ningxia Hui Autonomous Region.     

Effect of a health reminder on consumers’ selection of ultra-processed foods in a supermarket

Consumers report difficulties when trying to make healthy food choices in supermarkets due to environmental cues that favour the acquisition of unhealthy food items. This study’s objective was to investigate food selection in a supermarket to prepare a last minute meal by consumers with different levels of health consciousness. In an experimental design, 50 high (HHC) and 50 low health conscious (LHC) participants (n = 100) were told to choose all food items to prepare a meal for themselves plus a guest. For half the participants (25 HHC and 25 LHC), the expression ‘healthy meal’ was embedded in the instruction. To evaluate shopping healthfulness, foods selected by the participants were categorized according to level of industrial processing in Unprocessed/Minimally Processed (U/MP); Processed Culinary Ingredient (PCI); Processed (P), or Ultra-Processed (UP). The health reminder positively affected the choices of HHC and LHC individuals. Results indicate that placing reminders of healthy eating in shopping environments where P and UP foods sales are heavily promoted, such as supermarkets, can be a useful tool to promote healthy choices in accordance with what is recommended by the Dietary Guidelines for the Brazilian Population.     

β-Carotene and Milk Protein Complexation: a Thermodynamic Approach and a Photo Stabilization Study

The demand for bioactive molecules, such as β-carotene (β-car), has increased, but some characteristics such as low water solubility and low photo stability limit its application in many formulations. The bioactive entrapment into milk proteins may overcome this barrier. Thus, the aim of this work was to study the interaction between β-car and bovine serum albumin (BSA) or β-casein and the photo stability of this bioactive in the presence of the proteins. Fluorescence spectroscopy showed that at pH 7.0, increasing concentrations of β-carotene reduced the fluorescence intensity of both proteins, and the fluorescence-quenching mechanism is mainly static. The stoichiometry of the β-car/protein complex varied between proteins, being 1:1 to native BSA, 1:3 to denatured BSA (d-BSA), and 1:2 for β-casein. The standard Gibbs-free energy (ΔG°) of complex formation was negative for all systems studied and followed the order ΔG°_BSA?<?ΔG°_β-casein?<?ΔG°_d-BSA. The formation of β-car/protein complex was driven by entropy increasing in all studied conditions. Both proteins improved β-car photo stability, but β-casein micelle was more efficient, reducing and increasing four times, respectively, the bioactive degradation constant and the half-time of β-car. The overall results pointed to the strategic use of milk proteins, especially β-casein micelles as nanovehicle for β-car in food and other systems.     

Have a special Valentine''''s day!

大约在公元三世纪的罗马,那时恺撒已经死去快三百年了,暴君Claudius当政。当时,罗马内外战争频繁,民不聊生。为了补足兵员,将战争进行到底,Claudius下令,凡是一定年龄范围内的男子,都必须进入罗马军队,以生命为国家效劳。自此,丈夫离开妻子,少年离开恋人。于是整个罗马便被笼罩在绵长的相思中。对此,暴君大为恼火。为了达到自己的目的,他竟然下令禁止国人举行结婚典礼,甚至要求已经结婚的毁掉婚约。然而,暴政禁止不了爱情。就在暴君的国都里,居住着一位德高望重的修士,他就是Valentine,我们的主人公。他不忍看到一对对伴侣就这样生离死别,于是为前来请求帮助的情侣秘密地主持上帝的结婚典礼。一时间,这一令人振奋的消息在整个国度传开,更多的情侣秘密地赶来请求修士的帮助。但是,事情很快还是被暴君知晓了,于是他再一次显示了残暴面目——将修士打进大牢,最终折磨致死。修士死的那一天是2月14日,公元270年的2月14日。人们为了纪念这个敢于与暴君斗争的人,渐渐地使得2月14日成为一个节日。很多世纪过去了,人们再也记不得Claudius的大名,再也记不得他的权杖与宝剑,但依然会纪念Valentine修士,因为那个日子是Valentine's day,是情人节。投稿内容:生活照3-5张,个人简历、联系方式。我们的邮箱:dogfan@vip．sina．com《梦工厂》栏目收联系电话:85894789联系人:真真