No.

Chief Investigator

Project

Duration

E-mail Address

1

Chai peng

Tracking oxygen fugacity of multiphase magmatic processes and study

on petrogenesis of Ermi reduced porphyry copper deposit

2017-2019

cx001chaipeng@163.com

2

Ding huixia

Metamorphic evolution of the Higher Himalayan Crystalline Sequence in

Cuona region, south Tibet

2017-2019

dhx1987105@126.com

3

Guo wenfeng

Silicic magma petrogenesis and evolution and the plumbing system of

Wangtian’e volcano: constraint from petrogeochemical evidence and

thermodynamic modeling

2017-2019

guowenfeng@cags.ac.cn

4

Guo xiaoyu

Lithospheric architecture of the NE corner of Tibet and the deep

deformation

2017-2020

xguo0515@126.com

5

Kuang yongsheng

Source characterics of volcanic rocks in Xiaoling and Laohutai Formation, Eastern Liaoning: Constrained by melt inclusions and olivines

2017-2020

kuangyongsheng@163.com

6

Liu chaohui

Precambrian Geology

2017-2019

denverliu82@gmail.com

7

Liu pinghua

Multiple metamorphic events of the eastern Alxa-Langshan Precambrian

metamorphic complex, western Inner Mongolia

2017-2020

lph1213@126.com

8

Liu yongqing

the Late Jurassic eolian depositional associations in North China,and

its implications of palaeoclimate and palaeogeography

2017-2020

liuyongqing@cags.ac.cn

9

Long tao

High spatial resolution simultaneous dating and determination of

trace elements in xenotimes by SHRIMP

2017-2019

longtao@bjshrimp.cn

10

Lv junchang

Study of the Ganzhou Dinosaurian Fauna from Ganzhou district, Jiangxi

Province

2017-2020

lujc2008@126.com

11

Ma xiaoli

Tectonic activity along the Xianshuihe fault zone and deformation

model constraint of the eastern Tibetan Plateau

2017-2020

mlchevalier@hotmail.com

12

Meng fancong

Genetic mineralogy of garnet peridotite-eclogite from the PolarUrals, Russia

2017-2020

mengfancong@yeah.net

13

Niu xiaolu

Origin and geological significance of the Indosinian alkaline rocks on the western part of the northern margin of North China Craton,Inner Mongolia

2017-2020

niuxiaoludx@126.com

14

Pan jiawei

Late Cenozoic tectonic deformation, activity time, and its geodynamic

backgroud of the Qiangtang block

2017-2020

jiawei-pan@foxmail.com

15

She yuwei

Investigation of iron and chromium isotopes of podiform chromite deposits in the Yarlung-Zangbo ophiolite belt, Tibet

2017-2019

sheyuwei@cags.ac.cn

16

Wang dan

The study of sedimentary N-isotopic compositions in the Nanhua basin during the Cryogenian interglacial period

2017-2019

njuwangdan@163.com

17

Wang huan

Microstructural, mineralogical and geochemical characteristics of the

Wenchuan earthquake fault zone and their deformation mechanisms

2017-2019

wanghuan4585@126.com

18

Wang yafei

Research on ancient crustal materials in Anshan and eastern Hebei

2017-2019

pengfei4783@163.com

19

Xu xiang zhen

Detailed FIB and TEM studies from the different types of mantle

peridotite

2017-2020

xuxiangzhensjl@aliyun.com

20

Yan zhen

Study on tectonic evolution of the early Paleozoic Lajishan

trench-arc system

2017-2020

yanzhen@mail.iggcas.ac.cn

21

Yang shaohua

Overring plate properties constraint subduction evolution: theexample of the Lhasa Terrane

2017-2019

yangshaohua09@sina.com

22

Yi zhiyu

Record of rapid apparent polar wander in East Asia and its

significance

2017-2020

yizhiyu09@gmail.com

23

Zhang wen

Age, provenance and tectonic setting of Ji’an and Laoling groups,

southern Jilin Province within Jiao-Liao-Ji orogenic /mobile belt

2017-2019

wzhan7@126.com

24

Zhang xinyan

Joint traveltime inversion of deep seismic sounding and deep seismic reflection to image the crustal structure and the application

2017-2019

zhangxinyana@163.com

25

Zheng yong

Timing of brittle deformation within the Longmen Shan fault zone: New insights from 40Ar/39Ar ages of fault-gouges from WFSD-1 drilling core and surface ruptures

2017-2019

zygeology@163.com

26

LV Junchang

The study of Cretaceous dinosaurian faunas from Henan Province

2013-2016

lujc2008@126.com

27

JIN Xiaochi

Establishment and correlation of Permian biostratigraphic sequences of the Tengchong Block, western Yunnan

2013-2016

jinxchi@cags.ac.cn 

28

MENG Fancong

Genetic mineralogy of eclogite from the East Kunlun Mountains, western China

2013-2016

mengfancong@yeah.net

29

ZHANG Jianxin

Early Precambrian crustal evolution of the western Alxa block and constraints on the North China Craton

2013-2016

zjx66@yeah.net

30

QI Xuexiang

Identification of a Neoproterozoic magmatic belt in the Ailaoshan orogeny and its tectonic implications

2013-2016

qxuex2005@163.com

31

WANG Tao

The characteristics of rock assemblages and formation ages of a flysch mélange of the Bailongjiang Group in the western Qinling belt.

2013-2016

real-wt@sohu.com

32

Chevalier Marie-Luce

Towards final agreement on the total slip-rate and location of the entire Karakorum Fault, western Tibet

2013-2016

mlchevalier@hotmail.com

33

LI Jinyi

Provenance of Silurian-Permian clastic rocks on the northwestern margin of the Tarim basin and its constraints on the closure time of the Paleozoic ocean in the Tianshan Mountains

2013-2016

jyli2003@126.com

34

ZENG Lingsen

Construction of large leucogranite plutons along the Himalayan orogenic belt and thermal effects

2013-2016

zls1970@gmail.com

35

SONG Yucai

Study of the large Chaqupacha Pb-Zn deposit in the Fenghuo Shan-Nangqian fold-thrust belt, Tibet

2013-2016

songyucai@gmail.com

36

YANG Zhiming

Sources of metal and sulfur for post-collisional porphyry Cu deposits: A case study of the Qulong copper deposit, Tibet

2013-2016

zm.yang@hotmail.com

37

ZHU Xiangkun

Genesis of the Shilu Iron Ore Deposits, Hainan

2013-2016

xiangkun@cags.ac.cn

38

HE Rizheng

Structure of the front of the Asian mantle southward-subducted beneath North Tibet and effects on continental collision

2013-2016

herizheng@cags.ac.cn 

39

LU Zhanwu

Research on the structural attribute of strong seismic reflections in the crust of the southern Qiangtang terrane in central Tibet

2013-2016

luzhanwu78@163.com

40

WANG Haiyan

Fine lithospheric structure and deep processes of the inland deformation of the Xuefeng mountain tectonic zone

2013-2016

hyanwhy@126.com

41

DONG Jin

Paleo-secular variations and environ- mental magnetic study on Holocene lake sediments from the monsoon marginal zone in eastern China

2014-2017

djin@cugb.edu.cn

42

GUO Lei

Spatial distribution, transition mechanism and timing of late Mesozoic crustal contraction and extension on the southeastern China-Mongolia border

2014-2017

guolei_cn@sina.com

43

GUO Xianpu

Study on Middle-Late Ordovician vertebrate fauna in Bachu County, South Xinjiang

2014-2017

guoxianpu@cags.ac.cn

44

JI Shu’an

Early Cretaceous vertebrate fauna from the Ordos Basin (Inner Mongolia) and related stratigraphic correlation

2014-2017

jishu_an@sina.com

45

LI Yibing

Petrological and geochronological studies on variable magmatic evolution during the early stages of the Izu-Bonin-Mariana Island-arc

2014-2017

tansei007@aliyun.com

46

LI Zhaoli

Determination of the Songduo suture zone in the Lahsa terrain and Indosinian orogeny of the Qinghai-Tibet Plateau

2014-2017

lizhaoli3@tom.com

47

LIU Chaohui

Tectonic features of the Zhaertai and Bayan Obo Groups at the northern margin of the North China Craton and their relationship with break-up of the Columbia supercontinent

2014-2017

denverliu82@gmail.com

48

LIU Fulai

Multiple metamorphic and partial melting events in the San Jiang complex belt, southeastern Tibetan Plateau

2014-2017

lfl0225@sina.com

49

LIU Yongqing

The Tuchengzi-Zhangjiakou Formations and basin evolution at the transition of the Jurassic-Cretaceous in the Yanshan Mts. and implications for the North China rift system

2014-2017

liuyongqing@cags.ac.cn

50

TONG Ying

Petrogenesis of Permian A-type granites in the middle segment of the border between Mongolia and China and tectonic implications

2014-2017

yingtong@cags.ac.cn

51

WANG Yanbin

Crust formation and evolution of the Archaean Block from the Rauer Group, Antarctica: constraints from geochemistry and zircon U-Pb, Hf-O isotopes

2014-2017

fengguangying198@163.com

52

XU Jiren

Analyses of seismic data recorded at different depths of the Donghai 5000 m borehole and study of the non-linear properties of seismic waves in different layers and the seismo-tectonics in and around the Tanlu fault

2014-2017

xujiren1125@aliyun.com

53

YAN Zhen

Sedimentary analysis of the wedge-top basin within the ophiolite mélange belt in the Lajishan Mountains

2014-2017

yanzhen@mail.igcas.ac.cn

54

YANG Tiannan

Dose the Longmu Co-Shuanghu suture connect with the Changning-Menglian suture?

2014-2017

yangtn@cags.ac.cn

55

YIN Chongyu

Study on the lower age of the Chang’an glaciation and the biostratigraphy of the Cryogenian Period in South China

2014-2017

chongyuyin@cags.net.cn

56

YU Changqing

The deep structure and physical properties of the Eastern Tarim basin

2014-2017

geoyucq@hotmail.com

57

ZHENG Hongwei

The crust and upper mantle 3-D seismic velocity structure and dynamics beneath the Tongbai Orogen and adjacent areas

2014-2017

zhenghongwei004@sina.com

58

ZHOU Xiwen

Metamorphic evolution and genesis of the Paleoproterozoic khondalite series in the Liaoning and Jilin regions

2014-2017

xwzhou@cags.ac.cn

59

CAI Zhihui

Study of the relationship between horizontal and vertical shear zones and kinematic implications of Diancang- shan, southeastern Tibet

2014-2016

cai-zhihui@hotmail.com

60

FENG Guangying

Geochronology and geochemistry of Permian-Triassic mafic dikes in the Songnen-Zhangguangcailing Range, Jilin Province

2014-2016

fengguangying198@163.com

61

GUO Xiaoyu

Lithospheric structure of the Liupan Shan thrust-nappe belt, northeastern Tibetan Plateau, and deep deformation

2014-2016

guomichele@gmail.com

62

HAN Liang

The fine structure for fault healing and its impact on the mechanical properties of the fault

2014-2016

hanliangla@163.com

63

LEI Min

Magmatic evolution and eruption dynamic process for the cone-forming stage of the Changbaishan Tianchi volcano: evidence from melt inclusions

2014-2016

leiminlm@126.com

64

LI Jin

Mo isotopes of Mesoproterozoic Fe and Mn sedimentary formations of North China and implications for the paleo-oceanic environment

2014-2016

lijin80119@hotmail.com

65

LI Zhonghai

Subduction-induced mantle flow and seismic anisotropy: numerical modeling

2014-2016

lzhhai@gmail.com

66

LIU Pinghua

Petrology and metamorphic evolution of the Daqingshan-Wulashan high pressure granulites, northwestern North China Craton

2014-2016

lph1213@126.com

67

LIU Shoujie

Zircon characteristics under ultrahigh- temperature conditions: a case study of ultrahigh-temperature metamorphic rocks from Inner Mongolia

2014-2016

sjliu@bjshrimp.cn

68

LIU Yong

Geochemistry of Mesozoic basic rocks and interface conversion of the asthenosphere in the Hunan-Jiangxi Province

2014-2016

liuyongfirst@163.com

69

NIU Xiaolu

Petrology and Os-Pb-Nd-Sr isotope geochemistry of Datong Triassic lamprophyres and their geological significance

2014-2016

niuxiaoludx@126.com

70

WANG Fang

The genesis and metamorphic evolution of blueschists in the southern segment of the Lancang River, south-western China

2014-2016

wangfang_mr@163.com

71

XIANG Hua

The genesis of early Paleozoic sapphirine-bearing mafic granulites in the Tongbai orogen

2014-2016

xianghua2710@gmail.com

72

YAN Bin

Fe, Mo isotope constraints on Neoproterozoic negative carbon isotope excursions

2014-2016

yanbin703@163.com

73

LI Ming

Graptolite stratigraphic sequence in Nanba, Yiyang of Hunan Province and re-subdivision of the Tremadocian Stage

2015-2017

liming@cags.ac.cn

74

MENG Meicen

Research on lycopsids from the Upper Devonian of the lower reaches of the Yangtze River

2015-2017

mengmeicen@gmail.com

75

WU Zhenjie

Cyclostratigraphic study of the Jiangshanian Stage at the Duibian section, Zhejiang

2015-2017

wuzhenjie_cags@163.com

76

KOU Caihua

Petrogenesis of mafic-ultramafic rocks in northern Guangxi and constraints on the tectonic evolution of the western Jiangnan Orogen

2015-2017

caihuakou@163.com

77

HUANG He

Mechanism of Nb-Ta enrichment and mineralization in the Boziguo’er alkali granite pluton in the South Tianshan, Xinjiang Province

2015-2017

huanghecugb@126.com

78

ZHANG Yinghui

Phase equilibria during partial melting of TTG gneisses and petrogenesis of potassic granites in the Hengshan Complex

2015-2017

yhzhang@sina.cn

79

ZHENG Ning

Study of features of early Paleozoic radiolarian siliceous rocks and sedimentary environment in Yongzhou-Pingxiang, Hunan and Jiangxi, South China

2015-2017

zhengninglaio@163.com

80

JIA Jianliang

Research on the conductive mechanism of lacustrine immature organic-rich shale, based on accumulation differences of organic matter and its interpretation model

2015-2017

jiajl0228@163.com

81

XIE Shiwen

Temporal and spatial distribution and zircon Hf-O isotopes of Paleoproterozoic magmatic rocks in the Jiaodong terrane

2015-2017

swxie210@163.com

82

LIU Jiang

Occurrence and weakening effect of amorphous carbon in the fault slip zone：A case study of the Wenchuan earthquake fault zone

2015-2017

liujiang689@163.com

83

LI Shan

Source, petrogenesis and tectonic implications of Triassic granitoids in the Linxi area of Inner Mongolia, southern Central Asian Orogenic Belt

2015-2017

lishan428@163.com

84

SUN Jian

Iron isotope investigation of hydrothermal sedimentary iron deposits: a case study of the Motuosala Iron deposit in Xinjiang Province

2015-2017

sunjiantc@163.com

85

CHEN Xijie

Petrogenesis and crust-mantle interaction related to early Permian extensional tectono-magmatic assemblages in the Harlik Mt., eastern Tianshan belt

2015-2017

chenxijie@cags.ac.cn

86

LIU Yingchao

Origin of F-rich fluids in  carbonate- hosted Pb-Zn deposits in a thrust belt of a collisional orogen: A case study of the Mohailaheng deposit in Qinghai

2015-2017

lychappy@126.com

87

LI Jie

Development of Cenozoic reference material for Ar-Ar dating

2015-2017

huaer3312@sina.com

88

YANG Jing

40Ar/39Ar geochronology of the oxidation zone of sulfide deposits (Liuhuangshan and Kangguer deposits) from the Tu-Ha basin recorded paleoclimatic significance

2015-2017

yangjing822822@gmail.com

89

ZHU Xiaosan

Study of the Precambrian collisional belt between the Yangtze and Cathaysia blocks, based on deep reflection seismic data

2015-2017

zhuxiaosan@yahoo.com

90

LI Wenhui

Research on joint inversion of deep seismic sounding and coincident deep seismic reflection data from the Qinling profile

2015-2017

dereklee1984@126.com

91

TIAN Shugang

Late Permian organic reefs and palaeogeographic conditions in the Linxi, area, Inner Mongolia - Jiutai, Jilin

2015-2018

sgtian@cags.ac.cn

92

YAO Jianxin

High-precision stratigraphic correlation between South China and Tibet during the major turning period of the Permian-Triassic biotic evolution

2015-2018

yaojianxin@cags.ac.cn

93

LIU Jianfeng

Petrogenesis and geological significance of early-middle Triassic mafic volcanic rocks from southeastern Inner Mongolia

2015-2018

wenjv@aliyun.com

94

ZHANG Zeming

Formation and evolution of the Precambrian crystalline basement of southeastern Tibet

2015-2018

zzm2111@sina.com

95

WU Cailai

Magmatic system dynamics in Shujiadian, Tongling

2015-2018

wucailai@126.com

96

Zhang Hongrui

Coupling between deformation and fluid flow in the Baiyangping ore-producing hydrothermal system, Sanjiang area

2015-2018

hongrui_1982@126.com

97

KUANG Hongwei

Formation mechanism and correlation of molar tooth carbonate—the sedimentary record in the Meso-Neoproterozoic

2015-2018

kuanghw@126.com

98

DONG Chunyan

Late Neoarchean to early Paleoprotero- zoic tectono-magmatic-thermal events in the Daqingshan area: Geology, geochemistry and zircon geochronology

2015-2018

dongchunyan@sina.com

99

XIE Hangqiang

Tectono-thermal events and tectonic setting during the late Neoarchean in western Shandong

2015-2018

rock@bjshrimp.cn

100

WAN Yusheng

Formation and evolution of the Archean basement in eastern Hebei: Geology, geochemistry and SHRIMP U-Pb zircon dating

2015-2018

wanyusheng@bjshrimp.cn

101

REN Liudong

Distribution of Pan-African orogenic belts in the East Antarctic Craton and geological features of the Prydz belt

2015-2018

ldren@cags.ac.cn

102

LU Haijian

Tectonic coupling between the Kumukuli basin and adjacent orogenic belts: evidence from paleomagnetism and low-temperature thermochronometry

2015-2018

haijianlu2007@126.com

103

CAO Hui

P-T-t-D path based on quantitative data of porphyroblast growth: a case study of Qilian Tuolemuchang

2015-2018

caohuicugb@hotmail.com

104

TANG Suohan

Precise determination of Ti isotope com- position in rock samples and geological application in mantle processes

2015-2018

tangsuohan@163.com

105

YANG Zhiming

Genesis of comb quartz layers: case studies from porphyry Cu deposits at Qulong, Tibet and Now Chun, Iran

2015-2018

zm.yang@hotmail.com

106

CHEN Wen

Isotope thermochronological research on orogenic and ore-forming processes in the eastern part of the western Tianshan orogenic belt

2015-2018

chenwenf@vip.sina.com

107

HOU Hesheng

Tectonophysics research and its significance for the Suihua-Hulin profile, northeast China

2015-2018

hesheng.hou@126.com

108

LI Suping

Pleistocene palynological sequence and paleoecology reconstruction of karst caves in Chongzuo, Guangxi

2016-2018

lisuping.ibcas@gmail.com

109

ZONG Pu

Study of Late Devonian Famennian brachiopod fauna from western Junggar, Xinjiang

2016-2018

zongpu0501@gmail.com

110

LI Ya

The studies of carpological remains of the aquatic angiosperms from the Miocene of northern Hebei Province, China

2016-2018

liya207@mails.gucas.ac.cn

111

YANG Ben

Systematic and biostratigraphic studies on the early Meishucunian small shelly fossils from the Daibu Member of the Yongshan area in Yunnan Province

2016-2018

benyang@cags.ac.cn

112

TIAN Zuolin

Phase equilibrium of the metamorphic PTt paths for granulites from Namche Barwa

2016-2018

zuolintian@163.com

113

XIONG Fahui

Origin of platinum group minerals in different types of chromitite from the Purang ophiolite, Tibet

2016-2018

xiongfahui@126.com

114

CAI Jia

Phase equilibria modeling constraints on the metamorphic-anatectic evolution of metasedimentary rocks within the Ji'an and Laoling groups, southern Jilin Province

2016-2018

caijia91052@126.com

115

DONG Hanwen

Tectonic evolution of the Medog shear zone and its constrains on the formation of the Namche Barwa Syntaxis

2016-2018

donghanwen123@126.com

116

MA XUxuan

Neoproterozoic magmatic events in the Central Tianshan block, NW China

2016-2018

xuxuan.ma@hotmail.com

117

ZHENG Rongguo

The geochronology, petrogenesis, and tectonic significance of the Gongpoquan group volcanic rocks in the Xiaohuangshan-Yueyashan region, Beishan, Inner Mongolia

2016-2018

rgzheng@163.com

118

HU Peiyuan

The tectonic significance of Cambrian volcano-sedimentary event of the Lhasa terrane, Tibetan plateau

2016-2018

azure_jlu@126.com

119

GAO Li’e

Himalayan orogenic belt in Caledonian times

2016-2018

liegao09@163.com

120

ZHANG Zhiyu

Genesis of pegmatoid shell: case studies from the super-large Dahutang tungsten deposit in Jiangxi Province

2016-2018

zhangzhiyu@cags.ac.cn

121

SUN Jingbo

Tectono-thermal evolution study of the Aqishan-yamansu area in the eastern Tianshan, NW China

2016-2018

jingbo95003@126.com

122

YU Shun

The tectono-thermal evolution and uplift/exhumation of thrust-fold zones in the Kuqa-South Tianshan area: constraints from low temperature thermochronometry

2016-2018

yushun0722@163.com

123

ZHAI Qingguo

Tectonics of the Tibetan plateau

2016-2018

zhaiqingguo@126.com

124

YANG Jingsui

A global study on the origin of UHP minerals in mantle peridotites and chromitites in ophiolites of different tectonic settings

2016-2020

yangjsui@cags.ac.cn

125

LIU Pengju

Ediacaran silicified microfossils from the Hunan and Guizhou Provinces and their biostratigraphic correlation

2016-2019

pengju@cags.ac.cn

126

TANG Feng

Macrofossil biotas in the late Ediacaran–Cambrian boundary interval of South China and biostratigraphic correlation

2016-2019

tangfeng@cags.ac.cn

127

ZHANG Cong

Tracing the ancient subcontinental lithospheric mantle----Example from garnet peridotite of the Lvliangshan terrane, North Qaidam UHP metamorphic belt

2016-2019

congzhang@pku.edu.cn

128

YU Shengyao

Anatexis, deformation and exhumation of UHP metamorphic rocks: a case study of the South Altun-North Qaidam UHP metamorphic belt

2016-2019

yushengyao1981@163.com

129

MENG En

Petrogenesis of the Paleoproterozoic metamorphic supracrustal sequence and meta-mafic intrusions in Liaoning and Jilin Provinces: constraints on the regional tectonic evolution

2016-2019

mengen0416@126.com

130

YANG Chonghui

Magmatic activity in the (2.4-2.3 Ga) global magmatic quiescence: A case study of the North China Craton

2016-2019

chhyang@139.com

131

ZHANG Jianxin

Metamorphic and deformational history of fossil subduction channels--examples from the North Qilian and North Altun

2016-2019

zjx66@yeah.net

132

ZHANG Jin

Study on the kinematics, stages and tectonic backgrounds of the main fault systems in and around the Alxa Block

2016-2019

zhangjinem@sina.com

133

SI Jialiang

Fluid-rock interaction during healing of the Longmenshan fault zone

2016-2019

gongrenbaqin@126.com

134

ZHAO Lei

Nature of the Daheishan mafic- ultramafic complex from the Yiwu area, East Junggar, and comparative study on ophiolites in the East and West Junggar

2016-2019

jleiz@163.com

135

YIN Jiyuan

Thermochronologic constraints on exhumation processes in the West Junggar metallogenic belt

2016-2019

yinjiyuan1983@163.com

136

ZHANG Yan

The study of Ar-Ar dating on ultrafine minerals

2016-2019

yzhang737@sina.com

137

HE Rizheng

Eastward tracing LongmuCo-Shuanghu suture zone and its tectonic significance

2016-2019

herizheng@cags.ac.cn

138

LU Zhanwu

Study of “bright spots” structures in deep seismic reflection profiles in central and western Tibet

2016-2019

luzhanwu78@163.com

139

LI Qiusheng

The deep process and geodynamics of Mesozoic tectonic transition in the intersection area of rhe Nanling Range-Wuyi Mountain, southeastern China -– applying a high dense array of broadband seismic observations

2016-2019

liqiusheng@cags.ac.cn

140

XIONG Xiaosong

Detailed structure of the lithosphere and numerical modeling of crustal growth in the middle region in the Great Xing'an Range

2016-2019

xsxung@126.com

141

WANG Haiyan

Lithosphere structure and development of the Qinling orogenic belt

2016-2019

hyanwhy@126.com