Toric Codes over Finite Fields

In this note, a class of error-correcting codes is associated to a toric variety defined over a finite field _q, analogous to the class of AG codes associated to a curve. For small q, many of these codes have parameters beating the Gilbert-Varshamov bound. In fact, using toric codes, we construct a (n,k,d)=(49,11,28) code over ₈, which is better than any other known code listed in Brouwers tables for that n, k and q. We give upper and lower bounds on the minimum distance. We conclude with a discussion of some decoding methods. Many examples are given throughout.     

根际修复中五氯酚耐性草种的筛选及其应用效果研究

以8种国内外应用较为广泛的草坪草种为材料,进行了根际修复中五氯酚(PCP)耐性草种的筛选及其应用效果研究,结果表明,多年生黑麦草顶峰(Pinnacle)为PCP耐性品种,在PCP污染土壤的根际修复中具有通过优化土壤环境而促进PCP在根际微域中快速降解的能力。研究结果为PCP污染土壤根际修复中目标植物的合理选取提供了科学试验依据。     

菲律宾A.C.钢厂多品种小型轧机简介

介绍了由洛阳矿山工程研究院设计的菲律宾A．C．钢厂多品种小型轧机的平面布置、工艺流程、主要设备参数、经济指标、自动化水平及多小型一体生产的特点。     

Chemical changes of three native Turkish hazelnut varieties (Corylus avellana L.) during fruit development

Three native hazelnut varieties from Turkey, namely, Tombul, Palaz, and Badem, were examined for their proximate composition, minerals, and fatty acid profiles, as well as polyphenol oxidase (PPO), peroxidase (POD), and lipase activities during fruit development stages (early stage: ES, middle stage: MS, and harvest stage: HS). Proximate composition varied considerably (dry weight basis) from ES to MS. Fat was the predominant component at all stages and showed increasing trends. Six essential minerals (calcium, iron, magnesium, phosphorus, potassium, and zinc) were analysed (dry weight basis). Consuming recommended daily amount of 42.5 g hazelnut at HS supplies 23.3–25.0% of phosphorus, 11.6–18.1% of magnesium, 7.0–18.9% of iron, 4.9–8.9% of zinc, 5.1–5.7% of calcium, and 5.1–5.3% of potassium for recommended dietary allowances or adequate intake for adults. Significant (P < 0.05) decreasing trends were found in all mineral contents from early development to maturity, with some exceptions. Sixteen fatty acids were identified, among which 18:1ω9 was by far the most predominant one, followed by 18:2ω6, 16:0, and 18:0. As expected, total monounsaturated fatty acids constituted the main group of fatty acids ranging from 75.51 to 81.07% in Tombul, from 78.21 to 82.71% in Palaz, and from 73.69 to 81.65% in Badem through the maturation stages. In contrast, total polyunsaturated fatty acids showed decreasing trends from ES to HS. No significant changes (P > 0.05) were observed in total saturated fatty acids at different maturation stages. Tombul variety had the lowest PPO activity compared to those of Palaz and Badem. Badem showed highest POD activity compared to Tombul and Palaz at three stages of maturation and significant decreases (P < 0.05) in all hazelnut samples were observed in POD activity from ES to HS. No lipase activity was detected in any hazelnut samples at ES and MS, except in Badem at MS. In contrast, lipase activity was detected in all hazelnut samples at HS. These results suggest that some proximate compositions, minerals, and fatty acids gave good indications during fruit development stages, whereas enzymatic activities of PPO, POD, and lipase behaved differently among varieties and fruit development stages.     

HOP INDUSTRY ADVISORY COMMITTEE: BREWING TRIALS WITH WYE TARGET AND NORTHERN BREWER HOPS

Brewing trials with hops from the 1974 crop complete a three-year series in which Wye Target hops have been compared for brewing suitability with a control growth of Northern Brewer hops. Between 8 and 11 breweries took part each year. Physical examination of the hops used showed Wye Target to have less seed and to have a smaller cone size than the Northern Brewer but with a tendency to be loosely packed. When brewed at similar α-acid-into-brew rates as Northern Brewer hops, beers of similar analytical and flavour-assessed bitterness were produced. On general flavour grounds the beers were equally preferred. In all cases the Wye Target hops were rated as a copper hop either as equally suitable as, or more suitable than, the Northern Brewer hops.     

浅析西湖龙井茶品质形成的原因

西湖龙井茶是我国绿茶中最知名的产品之一,本文试从优异的茶区环境、优良的茶树品种、严格的栽培管理、精湛的加工技术浅析形成西湖龙井独特品质的原因,并通过简单的比较试验进一步论证了鲜叶原料和加工技术的重要性,对西湖龙井茶品质中有关"韵"的理解提出一些看法。     

Trends and Methods in Hemp Breeding in Poland

Abstract

The growth of hemp cultivation area in the world is a result of increasing its multidirectional utilization. This causes an urgent need of creating varieties adapted to requirements of new trends in hemp utilization by interested industries.

To accomplish these goals traditional and biotechnological methods of breeding are being modified. However, due to high costs of employing highly qualified personnel and acquiring materials for breeding, the process of obtaining results could be accelerated by more effective international cooperation. The trends, objectives and methods of breeding realized in Poland are targeted at bringing breeding centers near to cooperation.     

Application of complexing reagents to flotation separation of the varieties of pyrite

It is considered how the organic reagents, complexing agents, change floatability of the varieties of pyrite with different content of goal. The authors continue studying the flotation effect of the reagent PROX capable to selectively decrease floatability of some pyrite varieties in the presence of xanthogenate due to formation of a hydrophilic complex compound with ferric iron at the phase interface of the mineral surface — liquid, and to reduce sorption of xanthogenate. A phytogenous reagent is suggested as an alternative to the multi-component PROX. The new reagent mechanism is described by examining the chromatographic behavior of the compound of this reagent and ferric iron salt. __________ Translated from Fiziko-Tekhnicheskie Problemy Razrabotki Poleznykh Iskopaemykh, No. 4, pp. 111–120, July–August, 2007.     

菲律宾电力市场浅析及对中国的启示

简要介绍了菲律宾电力市场改革的历程。重点介绍了菲律宾电力市场的市场构成、交易机制和市场运行流程,并对其调度和交易分离的现货市场运行经验进行了分析。同时阐述了菲律宾电力市场的全电量竞价、净额结算,节点边际电价,计划中的辅助服务市场和能量市场联合优化一体化出清,以及双结算体系的特点。最后从市场注册、交易组织、交易执行、交易结算、信息披露、技术支持系统建设等方面给出了对中国的启示。     

杀虫剂新品种开发进展及特点

综述了近20年来杀虫剂新品种的开发进展，并介绍了杀虫剂工业发展的一些新特点。