A single key-odorant accounts for the pheromonal effect of rabbit milk: Further test of the mammary pheromone’s activity against a wide sample of volatiles from milk

Summary. In the rabbit, lactating females emit a volatile compound in milk, the mammary pheromone (MP), that triggers rooting for the nipple and its grasping in pups. Previous studies have shown that the MP seems to act selectively, in terms both of intensity and quality. Here, we aimed to add new evidence to these properties of the MP. Newborn rabbits (n=825) were submitted to an oral activation test allowing to measure their searching/grasping responses towards different stimuli. In Experiment 1 we assessed whether pups respond to the MP in an intensity-dependent manner. In Experiment 2 we assessed the activity of 20 volatiles previously identified in rabbit milk, other than the MP, which were never systematically tested for intensitydependence. The assays showed that a) neonatal responses are released by the MP only for a limited range of concentrations; b) the 20 other odorants from milk are inactive at any concentration. Thus, the MP appears to be the single volatile from rabbit milk that releases searching/grasping behaviour in pups.     

全循环工艺治理2,4-二甲基苯胺生产中的还原废水

对铁粉还原法生产２,４－二甲基苯胺过程中产生的废水,采用蒸发为水蒸气后回用于汽提的全循环工艺,可实现零排放。对循环过程进行了水平衡、热量衡算和经济分析,证明了该工艺的可行性。     

血浆蛋白粉对早期断奶仔猪的作用与应用研究概述

本文对血浆蛋白粉的特点、血浆蛋白粉对早期断奶仔猪的影响和在饲料中如何合理利用作一综述，为血浆蛋白粉的合理应用提供一定的理论基础．     

垃圾筛上物衍生燃料(RDF)粘结剂筛选

分别以5%的煤粉、CaO、污泥、电石渣作为添加剂,制备的垃圾RDF成型率和落下强度优于未添加对照组,RDF热值、储存性能均高于原垃圾,其中:RDF成型率和落下强度以电石渣最高,分别为90%和81.8%。热值以添加煤粉最高,达15899.2kJ/kg以上。原垃圾筛上物经过4周的储存后,产生1590mL渗滤液、挥发分含量减少了20.23%,臭度为五级,而RDF中均无渗滤液产生、挥发分无变化、臭味强度降为1级以下。灰色关联度计算结果表明:电石渣>煤粉>污泥>CaO,因此,电石渣是最佳粘结剂。     

生产工艺条件对菌粉爆炸特征参数的影响

利用扫描电镜及激光粒度分析仪,探究了不同生产工艺条件下医药中间体菌粉A和菌粉B的表面形状及粒径分布,并进行了热解分析,证实上述特征参数存在一定差别。在此基础上进行了爆炸特性参数研究。研究结果表明,上述两种菌粉爆炸下限处于70~90 g/m3,最大爆炸压力峰值0.4~0.5 MPa之间,爆炸性相对较弱,但也必须引起足够的重视。与菌粉B相比,菌粉A相对安全,因此条件许可时优先采用菌粉A生产工艺流程。     

Explosion behaviour of metallic nano powders

This paper describes experiences and results of experiments with several metallic dusts within the nanometer range. The nano dusts (aluminium, iron, zinc, titanium and copper) were tested in a modified experimental setup for the test apparatus 20 L-sphere (also known as 20-L Siwek Chamber), that enables the test samples to be kept under inert atmospheric conditions nearly until ignition. This setup was already introduced in earlier papers by the authors. It was designed to allow the determination of safety characteristics of nano powders under most critical circumstances (e.g. minimisation of the influence of oxidation before the test itself). Furthermore the influence of passivation on explosion behaviour is investigated and additional tests with deposited dust were carried out to describe the burning behaviour of all dusts. For a better characterisation all samples were tested with a simultaneous thermal analysis (STA). To minimise the influence of oxidation all samples were handled at inert conditions until shortly before ignition or start of the test respectively.     

工业粉体下落过程粉尘排放特性的实验研究

根据与维也纳工业大学化学工程研究所共同确定的实验方案,在实验室开发并设计了一套自由下落装置,研究粉体下落过程中粉尘的排放特性。通过实验主要测定下落高度、空气湿度和质量流量对粉尘排放的影响。实验结果表明,下落高度和空气湿度对粉尘排放均有影响,且空气湿度对粗粒子的排放影响较大,对细粒子影响较小;随着质量流量的增加,粉尘产生率逐渐减小,但质量流量的增加也会增加粉尘浓度,加重了对工人的危害。建立了影响因素与粉尘产生率之间的数学模型,经检验,二者之间存在显著相关,实测值与理论计算值基本一致,可以应用已建立的数学模型定量评价粉尘产生量。     

ZCMR法从废物中制取活性炭及在含铬废水处理中应用

采用微波照射－ 氯化锌（ZCMR） 法从废物中制取锯末活性炭及烤胶废料活性炭,用所得的两种活性炭处理含铬废水,结果表明,ZCMR法制取的废物活性炭对电镀废水中铬的吸附容量是市售一级粉末活性炭的1.72 ～1.8 倍, 过滤速度是市售活性炭的1.6 ～1.7 倍, 极限吸附量达21.5 ～22.5mg/g．     

用粉煤灰处理印染废水

随着科学技术的迅速发展,粉煤灰的利用价值越来越被人们所重视.阜新毛条厂印染废水设计采用阜新市热电厂粉煤灰进行处理,本方案对COD 的去除率为 75% ,对BOD 的去除率为76% ,对色度的去除率为71.4% ,效果良好,其一次投资及运行费用较其它处理方法也低得多.用粉煤灰处理印染废水可达到以废治废的效果,在我国是一项新的尝试,其理论基础及处理工艺很值得研究与推广     

催化湿式氧化催化剂及处理技术研究

通过共沉淀制备了４类主活性成分分别为Ｃｕ、Ｃｅ、Ｃｄ和Ｃｏ－Ｂｉ的粉末催化剂,用于催化湿式氧化（ＣＷＡＯ）处理染料中间体Ｈ－酸溶液,通过实验确定了催化湿式氧化的条件,不同催化剂的处理效果比较表明,Ｃｕ／Ｃｅ（３：１）催化剂较好,当反应湿度为２００℃,氧分压为３．０ＭＰａ,ＰＨ＝１２．０,反应时间为３０ｍｉｎ时,ＣＯＤ的支大于９０％