The publication of the fifth volume of Xi Jinping:The Governance of China in July represents a significant milestone in the international dissemination of contemporary Chinese political thought.For foreign audiences s...The publication of the fifth volume of Xi Jinping:The Governance of China in July represents a significant milestone in the international dissemination of contemporary Chinese political thought.For foreign audiences seeking to understand the internal logic,strategic priorities and normative worldview of the worlds second largest economy,the volume provides an indispensable primary source.展开更多
[Objective] The aim was to study the bacterial carrying seeds as the primary infection sourcs of Cunularia leaf spot of maize, and to provide the theo-retical basis for the control of the disease in production. [ Meth...[Objective] The aim was to study the bacterial carrying seeds as the primary infection sourcs of Cunularia leaf spot of maize, and to provide the theo-retical basis for the control of the disease in production. [ Method] Through slide germination and seed tissue isolation method, the viabilities of seeds with internaland external bacterial carrying were detected ; the infection of bacterial carrying of seeds on the young seedling was detected indoors by sand culture method ; and the infection of bacterial carrying seeds on maize was detected using field cultivation method. [Result] The conidia of Gunularia and mycelia carried by maize seeds could survive through the winter. Intemal bacterial carrying of seed affected the germination of seeds, but external bacterial carrying did not affect the germination; internal and external bacterial carrying seeds could infect the radicle and gemmule of maize seedling. [Condusion] The conidia of Curvularia and mycelia carried by maize＇seeds could survive through the winter and infect the seedling, which would make the seedlings have weak growth.展开更多
This paper presents the morphologic,chemical and other typomorphic characteristics of native gold from four placer deposits(basins of the Lev.Nora,Skalistaya and Golysheva rivers,and Loginova brook),four placer occurr...This paper presents the morphologic,chemical and other typomorphic characteristics of native gold from four placer deposits(basins of the Lev.Nora,Skalistaya and Golysheva rivers,and Loginova brook),four placer occurrences(basins of the Lagernaya,Nizh.Litke and Prokhodimaya rivers,and Tikhiy brook),and the alluvial deposit of cape Mordovin on Bolshevik island of the Severnaya Zemlya archipelago(Russia).Optical microscopy,scanning electron microscopy and electron-probe microanalysis were used in this study.Placer gold from the Lagernaya,Golysheva,Nizh.Litke and Skalistaya rivers,Tikhiy brook and cape Mordovin is characterized by a very high fineness(>988‰)in the rims and a lower fineness(860‰–970‰)in the center.Gold particles from the placers of the Lev.Nora and Prokhodimaya rivers and Loginova brook are low fineness and widely vary in the center(from 647‰to 920‰)and are high fineness(950‰–980‰)in the rims.In some gold particles from the placers of the Lev.Nora and Skalistaya rivers,zones with Cu up to 1.2 wt.%and Hg up to 2.6 wt.%are observed.Titanite,monazite,cobaltite,ulmannite,brannerite,rutile,zircon,Y-xenotime,bismuthite,native bismuth and bismuthinite,garnet(almandine),Cu-or Ni-pyrrhotite were found in the native gold from the Skalistaya and Lev.Nora placers.Native gold from the Skalistaya river placer contains mineral micro-inclusions of cobaltite,Cu,Cd-bearing sphalerite and Fe,Cu-ullmannite.Native gold from the Lev.Nora river placer differs in the presence of brannerite and bismuth minerals.On the basis of the obtained results,available metallogenic characteristics of Bolshevik island and literature data,the following types of primary sources are predicted for these locations:(1)Lev.Nora river deposits of gold-copper rare metal and porphyry gold-copper formations;(2)Skalistaya river deposits of porphyry gold-copper and gold-quartz formation;(3)all the other locations:deposits of gold-quartz and gold-sulfide-quartz formations(hosted in terrigenous carbonaceous complexes).The presence of intermediate reservoirs near some of these locations is probable.展开更多
In this paper,the primary energy source of high current electron beam accelerator based on spiral pulse forming line is investigated.It consists of the constant-current power supply,the high voltage pulse capacitor,th...In this paper,the primary energy source of high current electron beam accelerator based on spiral pulse forming line is investigated.It consists of the constant-current power supply,the high voltage pulse capacitor,the field distortion switch,and the protection system.The primary energy source can discharge to the primary winding of the transformer with high voltage pulses whose amplitude of voltage is 40kV,current is 80kA,pulse width is 8μs and repetition frequency is less than 5Hz.The primary energy source is applied to a high current electron beam accelerator, and is featured by its compactness,stability and reliability.展开更多
The distribution and fractionation of persistent organic pollutants(POPs)in different matrices refer to how these pollutants are dispersed and separated within various environmental compartments.This is a significant ...The distribution and fractionation of persistent organic pollutants(POPs)in different matrices refer to how these pollutants are dispersed and separated within various environmental compartments.This is a significant study area as it helps us understand the transport efficiencies and long-range transport potentials of POPs to enter remote areas,particularly polar regions.This study provides a comprehensive review of the progress in understanding the distribution and fractionation of POPs.We focus on the contributions of four intermedia processes(dry and wet depositions for gaseous and particulate POPs)and determine their transfer between air and soil.These processes are controlled by their partitioning between gaseous and particulate phases in the atmosphere.The distribution patterns and fractionations can be categorized into primary and secondary types.Equations are developed to quantificationally study the primary and secondary distributions and fractionations of POPs.The analysis results suggest that the transfer of low molecular weight(LMW)POPs from air to soil is mainly through gas diffusion and particle deposition,whereas high molecular weight(HMW)POPs are mainly via particle deposition.HMW-POPs tend to be trapped near the source,whereas LMW-POPs are more prone to undergo long-range atmospheric transport.This crucial distinction elucidates the primary reason behind their temperatureindependent primary fractionation.However,the secondary distribution and fractionation can only be observed along a temperature gradient,such as latitudinal or altitudinal transects.An animation is produced by a one-dimensional transport model to simulate conceptively the transport of CB-28 and CB-180,revealing the similarities and differences between the primary and secondary distributions and fractionations.We suggest that the decreasing temperature trend along latitudes is not the major reason for POPs to be fractionated into the polar ecosystems,but drives the longer-term accumulation of POPs in cold climates or polar cold trapping.展开更多
文摘The publication of the fifth volume of Xi Jinping:The Governance of China in July represents a significant milestone in the international dissemination of contemporary Chinese political thought.For foreign audiences seeking to understand the internal logic,strategic priorities and normative worldview of the worlds second largest economy,the volume provides an indispensable primary source.
文摘[Objective] The aim was to study the bacterial carrying seeds as the primary infection sourcs of Cunularia leaf spot of maize, and to provide the theo-retical basis for the control of the disease in production. [ Method] Through slide germination and seed tissue isolation method, the viabilities of seeds with internaland external bacterial carrying were detected ; the infection of bacterial carrying of seeds on the young seedling was detected indoors by sand culture method ; and the infection of bacterial carrying seeds on maize was detected using field cultivation method. [Result] The conidia of Gunularia and mycelia carried by maize seeds could survive through the winter. Intemal bacterial carrying of seed affected the germination of seeds, but external bacterial carrying did not affect the germination; internal and external bacterial carrying seeds could infect the radicle and gemmule of maize seedling. [Condusion] The conidia of Curvularia and mycelia carried by maize＇seeds could survive through the winter and infect the seedling, which would make the seedlings have weak growth.
基金The work was carried out within the framework the State assignment of the Federal Agency for Subsoil Use of 27.12.2023№049-00003-24-00a State Assignment of the Sobolev Institute of Geology and Mineralogy,Russian Academy of Sciences(project no.122041400237-8).
文摘This paper presents the morphologic,chemical and other typomorphic characteristics of native gold from four placer deposits(basins of the Lev.Nora,Skalistaya and Golysheva rivers,and Loginova brook),four placer occurrences(basins of the Lagernaya,Nizh.Litke and Prokhodimaya rivers,and Tikhiy brook),and the alluvial deposit of cape Mordovin on Bolshevik island of the Severnaya Zemlya archipelago(Russia).Optical microscopy,scanning electron microscopy and electron-probe microanalysis were used in this study.Placer gold from the Lagernaya,Golysheva,Nizh.Litke and Skalistaya rivers,Tikhiy brook and cape Mordovin is characterized by a very high fineness(>988‰)in the rims and a lower fineness(860‰–970‰)in the center.Gold particles from the placers of the Lev.Nora and Prokhodimaya rivers and Loginova brook are low fineness and widely vary in the center(from 647‰to 920‰)and are high fineness(950‰–980‰)in the rims.In some gold particles from the placers of the Lev.Nora and Skalistaya rivers,zones with Cu up to 1.2 wt.%and Hg up to 2.6 wt.%are observed.Titanite,monazite,cobaltite,ulmannite,brannerite,rutile,zircon,Y-xenotime,bismuthite,native bismuth and bismuthinite,garnet(almandine),Cu-or Ni-pyrrhotite were found in the native gold from the Skalistaya and Lev.Nora placers.Native gold from the Skalistaya river placer contains mineral micro-inclusions of cobaltite,Cu,Cd-bearing sphalerite and Fe,Cu-ullmannite.Native gold from the Lev.Nora river placer differs in the presence of brannerite and bismuth minerals.On the basis of the obtained results,available metallogenic characteristics of Bolshevik island and literature data,the following types of primary sources are predicted for these locations:(1)Lev.Nora river deposits of gold-copper rare metal and porphyry gold-copper formations;(2)Skalistaya river deposits of porphyry gold-copper and gold-quartz formation;(3)all the other locations:deposits of gold-quartz and gold-sulfide-quartz formations(hosted in terrigenous carbonaceous complexes).The presence of intermediate reservoirs near some of these locations is probable.
文摘In this paper,the primary energy source of high current electron beam accelerator based on spiral pulse forming line is investigated.It consists of the constant-current power supply,the high voltage pulse capacitor,the field distortion switch,and the protection system.The primary energy source can discharge to the primary winding of the transformer with high voltage pulses whose amplitude of voltage is 40kV,current is 80kA,pulse width is 8μs and repetition frequency is less than 5Hz.The primary energy source is applied to a high current electron beam accelerator, and is featured by its compactness,stability and reliability.
基金supported by the National Natural Science Foundation of China(42077341),the State Key Laboratory of Urban Water Resource and Environment,Harbin Institute of Technology(No.2022TS05)the Special Project for Sustainable Development Science Technology in Shenzhen(No.KCXFZ20201221173000001)supported by the Heilongjiang Touyan Innovation Team Program and the Natural Science Foundation of Heilongjiang Province of China(Grant No.LH2021E096),China.
文摘The distribution and fractionation of persistent organic pollutants(POPs)in different matrices refer to how these pollutants are dispersed and separated within various environmental compartments.This is a significant study area as it helps us understand the transport efficiencies and long-range transport potentials of POPs to enter remote areas,particularly polar regions.This study provides a comprehensive review of the progress in understanding the distribution and fractionation of POPs.We focus on the contributions of four intermedia processes(dry and wet depositions for gaseous and particulate POPs)and determine their transfer between air and soil.These processes are controlled by their partitioning between gaseous and particulate phases in the atmosphere.The distribution patterns and fractionations can be categorized into primary and secondary types.Equations are developed to quantificationally study the primary and secondary distributions and fractionations of POPs.The analysis results suggest that the transfer of low molecular weight(LMW)POPs from air to soil is mainly through gas diffusion and particle deposition,whereas high molecular weight(HMW)POPs are mainly via particle deposition.HMW-POPs tend to be trapped near the source,whereas LMW-POPs are more prone to undergo long-range atmospheric transport.This crucial distinction elucidates the primary reason behind their temperatureindependent primary fractionation.However,the secondary distribution and fractionation can only be observed along a temperature gradient,such as latitudinal or altitudinal transects.An animation is produced by a one-dimensional transport model to simulate conceptively the transport of CB-28 and CB-180,revealing the similarities and differences between the primary and secondary distributions and fractionations.We suggest that the decreasing temperature trend along latitudes is not the major reason for POPs to be fractionated into the polar ecosystems,but drives the longer-term accumulation of POPs in cold climates or polar cold trapping.
