湖北石煤型钒矿地质特征及成因

湖北钒矿位于秦岭造山带武当隆起西北缘,黑虎-花瓶背斜的两翼,区内主要发育震旦系和寒武系地层,寒武系下统的杨家堡组和庄子沟组为矿区的含矿地层。区内钒矿化带主要由杨家堡组和庄子沟组的灰黑色-黄褐色薄层炭硅质岩、条纹条带状硅质岩、石煤化硅质岩和钒矿体等组成。该矿床属于沉积成因,其形成过程大致经历了早期的粘土矿物吸附作用和后期的活化富集作用等阶段。     

湖北省石板沟矿区钒矿地质特征与找矿方向

湖北省石板沟矿区钒矿位于秦岭-大别造山秦岭弧盆系东段,武当穹隆北缘。矿体主要呈层状,似层状赋存于下寒武系庄子沟组底部,直接找矿标志为黑色岩系,即黑色碳硅质板岩,含磷质结核,是一个沉积变质型钒矿床。本文介绍了该钒矿的矿区地层、构造、矿床的矿体、矿石矿物、矿石结构构造等特征及其找矿标志与找矿方向,对在该地区寻找类似的矿床具有借鉴意义。     

甘肃省肃南县头道沟铁矿地质特征

勘查区位于秦祁昆造山系-北祁连弧盆系-北祁连蛇绿混杂岩带一隅。矿区内出露地层较为简单,除零星第四系外,均为长城纪桦树沟组。总体上为一套类复理石含铁建造,呈北西-南东向展布。除铁矿层外,均为千枚状板岩类。岩性与区域地层颇为相似,主要组分相同,但次要成分不尽一致,各层之间均呈整合接触,或呈渐变关系。含铁千枚状板岩分布于矿区中部。其岩性为灰黑色千枚状板岩夹含铁碧玉条带,是赋矿的主要层位。矿床成因属喷气喷流沉积变质热液迭加矿床。     

甘肃省成县徐明山铅锌矿地质特征

矿区所处大地构造位置为昆仑秦岭地槽褶皱区秦岭褶皱系的礼县-榨水海西冒地槽褶皱带中部。褶皱区北部为塔里木-中朝地块,南部为扬子地块。徐明山铅锌矿床位于西成铅锌矿田的东北部。矿区出露地层主要为中泥盆统安家岔组(D2a)呈北西西向展布。按岩性组合和含矿性,安家岔组可分为厂坝层(D_2a~1)和焦沟层(D_2a~2)。北矿带以大理岩、黑云母方解石英片岩为主,夹石英岩,南矿带以条带状大理岩、条带状白云石大理岩、中厚层白云石大理岩夹中粗粒大理岩层为主。矿体产在一定层位,呈似层状、透镜状与围岩整合产出,矿石具变晶结构、交代溶蚀结构,细脉状及团块状构造。矿床宏观上具有明显的沉积矿床特征,微观上具有热液矿床特征,因此矿床应属沉积受变质层控型铅锌矿床。     

内蒙古秦家沟多金属矿区岩石地球化学特征及找矿方向

秦家沟多金属矿区位于内蒙古库伦旗,区内矿（化）体赋存于石炭系家道沟组（C2j）板岩夹硬砂岩、灰岩与花岗岩（γ）接触带板岩中。通过对秦家沟探槽岩石样品微量元素开展R型聚类分析和因子分析来揭示元素间及元素与地质作用之间的相互关系,认为本区存在多期成矿作用,区内主成矿元素为Zn、Ag、Pb、Au和Mo,伴生元素为As和Sb。基于因子间彼此独立的关系,说明本区的矿化存在多期次、多阶段的成矿作用,矿体是由含矿热液多次反复作用形成的。该矿区主要的找矿标志之一是印支、燕山期侵入岩,强烈的构造岩浆活动形成了岩浆热液型矿床和中-低温热液型矿床。     

湖北房县三甲垭钒矿地质特征及富集规律

三甲垭钒矿紧邻阳日-九道断裂,中型矿床,钒矿赋矿岩层为早古生代底寒武世牛蹄塘组(∈_(1-2)n)下段的黑色硅质岩与炭质页岩互层、粉砂质页岩、粉砂岩建造,包含I、Ⅱ含矿层两个矿层,矿体具明显的地层控矿专属性,钒矿的富集与粘土质矿物水白云母的吸附作用和生物作用相关,为浅海相同生沉积层状矿床。     

三种石煤钒矿浸出行为的对比研究

以江西省修水县、江西省彭泽县和湖北省通山县的三种石煤钒矿为对象,研究了直接酸浸工艺和空白焙烧-酸浸工艺对三种石煤钒矿中钒浸出行为的影响。结果表明:在温度95℃、浸出时间4h、液固比1∶1、H2SO4体积分数15%和CaF2质量分数5%的浸出条件下,三种石煤钒矿在直接酸浸工艺中的钒浸出率分别为92.39%、74.10%和40.53%,而在空白焙烧-酸浸工艺中的钒浸出率则分别为85.53%、90.78%和41.59%。石煤钒矿中钒、铁的赋存形式以及方解石等耗酸物质的含量均对钒浸出率有很大影响。空白焙烧能使炭质钒转变为较易溶出的游离钒氧化物,并能破坏云母类含钒矿物而促进钒的浸出,但同时也可能使黄铁矿等非耗酸矿物转变成赤铁矿等耗酸矿物而阻碍钒的浸出。上述三种石煤中的钒均主要赋存于云母类铝硅酸盐矿物中,根据原矿的不同特性需采用不同的提钒工艺:江西修水石煤钒矿宜采用直接浸出工艺,江西彭泽石煤钒矿宜采用空白焙烧-酸浸工艺,湖北通山石煤钒矿需采用其他提钒工艺。     

甘肃省舟曲县阳山沟铜钴多金属矿地质特征

勘查区位于南秦岭加里东褶皱带,武都弧型构造西翼,舟曲-徽县断裂带以南,迭部-武都-略阳断裂带以北。勘查区地层主要有志留系中上统白龙江群第一岩性段(S2+3bl1),在测区中上部岩性为泥钙质板岩、含碳泥钙质板岩夹砂质板岩,下部岩性为砂质板岩、砂岩夹钙质板岩。泥盆系古道岭组下岩组(D22g1),上覆于志留系之上,主要岩性上部为中厚-厚层灰岩。下部为薄-中厚层灰岩、泥灰岩、含生物碎屑灰岩,普查工作所发现的矿(化)体赋存于泥灰岩中。矿床成因具有中-低温热液蚀变的特征,属中-低温热液型。     

贵州四龙山钒矿床的地质特征及成因分析

四龙山钒矿位于贵州省铜仁市松桃县,赋矿地层主要为寒武系下统牛蹄塘组,含矿岩石为黑色页岩夹黑色薄层硅质岩.矿体呈层状产出,产状稳定,钒主要以类质同像的形式赋存在含钒伊利石中,分析其为深海-次深海沉积型层状钒矿床,钒矿化受地层、构造、岩相、古地理等因素控制,找矿标志明显.     

甘肃省舟曲县次拉山金矿地质特征

勘查区位于南秦岭加里东褶皱带,武都弧型构造西翼,舟曲-徽县断裂带以南,迭部-武都-略阳断裂带以北。勘查区地层主要有志留系中上统白龙江群第一岩性段(S_(2+3)bl_1),在测区中上部岩性为泥钙质板岩、含炭泥钙质板岩夹砂质板岩,下部岩性为砂质板岩、砂岩夹钙质板岩。泥盆系古道岭组下岩组(D_2~2g_1),上覆于志留系之上,主要岩性上部为中厚-厚层灰岩。下部为薄-中厚层灰岩、泥灰岩、含生物碎屑灰岩普查工作所发现的矿(化)体赋存于泥灰岩中。矿床成因具有中-低温热液蚀变的特征,属构造变质热液型。     

Changes in the ultra-fine structure of capillaries of the embryonic brain in the presence of schizophrenia in the mother

The report is concerned with a study of fine structures of brain capillaries in 9 embryos received during medical abortions from schizophrenic mothers. The authors established some traits in the ultrastructure of endothelial cells in most of the studied cases--an increase of the surface of endothelial cells at the expense of a tortuosity of their plasmatic membranes and a formation of growths, vacuolization of the cytoplasma. There were also some changes in the structure of basal membranes. In 2 cases there were also peculiar pathological changes in the vascular endothelium: granules of an unknown nature in the endothelial cells and a focal lysis of the plasmatic membranes of endothelial cells.     

不同除草剂在直播冬油菜田的除草效果研究

[目的]验证不同除草剂的除草效果,为直播冬油菜田的杂草防除提供借鉴.[方法]使用不同剂量25%胺苯磺隆可湿性粉剂和10.8%高效氟吡甲禾灵乳油在直播冬油菜田间进行单用和混用除草试验.[结果] 25%胺苯磺隆可湿性粉剂在冬油菜4～5叶期使用可以有效防除田间的阔叶杂草;25% 胺苯磺隆可湿性粉剂18.0～22.5 g/hm<'2>+400 ml/hm<'2>的10.8%高效氟吡甲采灵乳油可以有效防除油菜田间的阔叶和禾本科杂草,总防效达90%以上,且可以比人工除草节省成本1 100元、hm<'2>.[结论] 25%胺苯磺隆与10.8%高效氟吡甲未灵乳油混用可以更好地防除冬油菜田间杂草.     

Simulation of the solidification of the melt in the Vanyukov furnace in the case of emergency stoppage

A mathematical model of the Vanyukov furnace, which makes it possible to predict the behavior of an object in the emergency operational mode (upon the disconnection of the oxygen supply) and develop an effective system of additional heating which damps the consequences of the emergency mode and lowers the costs for the renovation of the furnace operation, is created. It is shown how solidification upon cooling the furnace with time is simulated using the enthalpy and porosity method. The mathematical model is adopted for existing production conditions, which are weakly defined. The energy characteristics of the mode for the solidifying furnace bath, which ensures its holding for a long time in the ready state to rapid firing, are found. Thus, the problem of excessively expensive furnace firing after prolonged production stoppage is solved in the conjugated statement with a calculation of the heating system of the overbath space.     

Variations in the relationship of the major vessels of the left coronary groove in the dog

The anatomic relationship of the 2 major vessels of the left coronary groove was studied in 140 dogs. Five basic patterns of disposition were observed: 1) circumflex artery superficial from its origin to the caudodorsal cardiac margin, coronary vein deep and not visible (22%); 2) coronary vein superficial from the ventral interventricular septum to the caudodorsal cardiac margin, circumflex artery deep and not visible (15%); 3) circumflex artery and coronary vein both superficial and running parallel with each other along the groove (8%); 4) coronary vein crossing circumflex artery at some point along the groove (44%); and 5) circumflex artery crossing coronary vein at some point along the groove (11%). These variations were found to influence certain experimental modifications of the left circumflex blood flow in the dog.     

Errors in the surgery of the testicle in children

The study was made of labyrinthine changes induced by lasix dehydration. Changes indicative of Meniere's disease were identified at comparison of the findings obtained by audiological lasix test, caloric optokinetic reactions. Four types of the nystagmic response in the bithermal lasix-test were determined. These reactions are helpful for more precise staging of the disease.     

Role of the subthalamo-nigral input in the control of amygdala-kindled seizures in the rat

The substantia nigra pars reticulata (SNpr) is a critical site for the control of epileptic seizures. Potentiation of the inhibitory GABAergic input from the striatum to the SNpr suppresses primary or secondary generalized seizures in the rat. The purpose of this study was to examine the possible involvement of the excitatory glutamatergic input from the subthalamic nucleus to the SNpr in the control of both the electroencephalographic and the motor components of amygdala-kindled seizures in the rat. Microinjections of either an N-methyl-D-aspartate (NMDA) antagonist in the substantia nigra or a GABAA agonist in the subthalamic nucleus, significantly reduced motor seizures but did not modified the afterdischarges. These results provide evidence for the involvement of the subthalamo-nigral projection in the modulation and the propagation of the motor components of amygdala-kindled seizures.     

On the role of self-excitation in the development of topographic order in the visual system of the frog

A two-level model is presented for explaining the development of the topographically ordered retinotectal connections of the visual system of the frog. The columnar structure of the tectum were taken into account explicitly. Simulations suggest that the self-excitatory intracolumnar connections play an important role in the formation of the topography. In the case of self-excitation the system is able to recognize the topology of the visual field by the continuity of the object's movement.     

Regional differences in the distribution of catalase in the epithelium of the ocular lens

The objectives of this study were to develop a system to calculate the economic consequences of accidents and to account for the economic consequences of all accidents during 1 year in a district. A total population injury survey was done in an area with a population of over 41,000. All accidents (N = 4926) occurring within a 12-month period and requiring medical care were noted. The costs (calculated at 1991 prices) to the health care service (outpatient care, including primary health care and hospital care) were SEK 23.7 million (US $3.59 million), to trade and industry SEK 79.7 million (US $12.08 million), and for health insurance SEK 9.1 million (US $1.38 million). The cost for society of uninsured people is not possible to estimate using loss of production. However, the time lost from "normal activities" was registered. If this time is valued at the same price as working hours, a welfare cost of SEK 43.1 million (US $6.53 million) should be added. In a forthcoming paper, an assessment of the cost-effectiveness of interventions against accidents will be published.     

The role of the forestomachs in the adaptation of the alimentary function in ruminants

Dietary character of ruminants in the north is principally different between "nonselective" (cattle, sheep) and "selective" (reindeer, moose) species. Due to the developed polyfunctioning, forestomach in ruminants, primarily rumen and reticulum, are involved in the homeostasis formation in enteral and interior mediums, nutrients deposition and recirculation. That provides efficiency in utilization of deficient in nutrients forage and body reserves of wild ruminants during the winter. The original functional organization of absorption processes and nutrients recirculation across the multilayer epithelium of forestomach also promotes realization of the two levels metabolism during the year and adaptation of wild ruminants to season dynamics of nutrition.